Electric working machine

Abstract

The present invention provides an electric working machine that can reduce power consumption when the electric working machine is not in use. An electric working machine of one embodiment of the present invention includes a driving unit that is driven using power from a power supply, and the electric working machine includes a control unit, a power supply for the control unit, and an action state determination unit. The power supply for the control unit includes a first conversion power supply and a second conversion power supply. The power supply for the control unit is configured to: when the action state determination unit determines that the action state of the control unit is a control action state, it is converted to a first conversion state, and when the action state determination unit determines that the action state of the control unit is a low-power action state, it is converted to a second conversion state. The second conversion state is a conversion state in which the voltage conversion of the first conversion power supply is stopped, and the power for the control unit is supplied to the control unit using at least the second conversion power supply.

Description

Technical Field

[0001] The invention relates to an electric working machine. Background Art

[0002] As an electric working machine, there is an electric working machine having a driving unit driven by power supplied from a battery (power supply) (Patent Document 1). The electric working machine includes: a control unit that controls a driving unit (such as a motor, a heater, etc.); and a power supply for the control unit that performs voltage conversion on the power from the battery and supplies the power to the control unit. In order to suppress overdischarge of the battery when not in use, the electric working machine cuts off the power supply of the power supply for the control unit, thereby suppressing the power consumption of the control unit and the power supply for the control unit to zero.

[0003] In addition, when the power supply to the control unit is cut off, the following phenomena may occur: (1) when the power supply is cut off, communication between the electric working machine and external equipment becomes impossible, and (2) a time lag occurs from the time the trigger is operated again to the time the motor starts to operate, resulting in a decrease in the usability.

[0004] In this regard, it is considered to use a method in which, when the electric working machine is not in use, the power supply to the power supply for the control unit is not cut off, but the control unit is switched to a low-power operation state (so-called sleep mode). For example, it is considered to use a control unit that is configured to be able to switch the operation state of the control unit to a control operation state for controlling the drive unit when the user operates the electric working machine and a low-power operation state for reducing the power consumption of the control unit. That is, the control unit is configured to be able to switch to a low-power operation state to suppress over-discharge of the battery.

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-341325 Summary of the invention

[0007] However, in the above-mentioned electric working machine, although the power consumption of the control unit can be reduced by changing the operating state of the control unit to the low-power operating state, the power consumption of the control unit power supply may not be reduced because the control unit power supply performs power conversion.

[0008] For example, when a linear regulator is used as a control unit power supply, when the output voltage of the battery (power supply voltage) becomes higher, the loss Ls (= (Vin-Vout) × Io) in the linear regulator becomes larger. Vin is the input voltage to the linear regulator (in other words, the output voltage of the battery), Vout is the output voltage from the linear regulator, and Io is the output current of the linear regulator. That is, during normal operation, power consumption associated with the loss Ls occurs in the control unit power supply in accordance with the increase in the power supply voltage.

[0009] In order to suppress the increase in power consumption caused by the high voltage of the power supply, it is considered to use a switching regulator such as a DC-DC converter as a power supply for the control unit. However, these switching regulators usually consume a large operating current, so even if the control unit is switched to the sleep mode, the operating current of the switching regulator is still large, making it difficult to achieve overall low power consumption.

[0010] That is, even if the control unit is shifted to the sleep mode when the electric working machine is not in use to reduce power consumption of the control unit, the power of the battery (power source) is consumed due to power consumption in the power supply for the control unit.

[0011] Therefore, in one aspect of the present invention, it is desirable to provide an electric working machine capable of reducing power consumption when the electric working machine is not in use.

[0012] One aspect of the present invention is an electric working machine including a driving unit driven by power from a power source, the electric working machine including a control unit, a power source for the control unit, and an operation state determination unit.

[0013] The control unit is configured to control the drive unit. The power supply for the control unit is configured to perform voltage conversion on the power supply power from the power supply and supply the power for the control unit after the voltage conversion to the control unit. The control unit is configured to be switchable to multiple operation states. The multiple operation states include at least a control operation state for controlling the drive unit and a low power operation state with lower power consumption than the control operation state.

[0014] The control unit power supply includes a first conversion power supply and a second conversion power supply. The first conversion power supply is configured to provide a control maximum current, which is a maximum current consumption in the control unit in a control operation state, when performing voltage conversion on the power supply power from the power supply. The second conversion power supply is configured to supply a low power maximum current, which is a maximum current consumption in the control unit in a low power operation state, when performing voltage conversion on the power supply power from the power supply, and the maximum output current is smaller than the control maximum current.

[0015] The operation state determination unit is configured to determine whether the operation state of the control unit is the control operation state or the low power operation state.

[0016] Furthermore, the power supply for the control unit is configured to change to a first conversion state when the action state determination unit determines that the action state of the control unit is a control action state, and to change to a second conversion state when the action state determination unit determines that the action state of the control unit is a low-power action state.

[0017] The first conversion state is a conversion state in which at least the first conversion power supply is used to supply control unit power to the control unit. The second conversion state is a conversion state in which the voltage conversion of the first conversion power supply is stopped and at least the second conversion power supply is used to supply control unit power to the control unit.

[0018] In the case where the control unit is in the low power operation state, the electric working machine does not use the first conversion power supply when the control unit power supply performs voltage conversion, thereby suppressing power consumption in the first conversion power supply. Therefore, when the operation state of the control unit changes from the control operation state to the low power operation state when the electric working machine is not in use, not only the power consumption in the control unit can be reduced, but also the power consumption in the first conversion power supply can be reduced, thereby reducing the power consumption when the electric working machine is not in use.

[0019] Next, in the above-mentioned electric working machine, the control unit power supply may be configured to change the operating state to the first transition state when a user operates the electric working machine.

[0020] That is, when the operation state of the control unit power supply is the second conversion state, when the user operates the electric working machine, the control unit power supply changes the operation state of the control unit power supply from the second conversion state to the first conversion state. As a result, the control unit is supplied with power for the control unit at least by the first conversion power supply, and thus can receive the supply of the maximum current required for control in the control operation state, and can control the drive unit. In addition, as an example of the user's operation on the electric working machine, the user's operation of the trigger switch can be cited.

[0021] Next, the electric working machine may further include a first reverse current suppressing unit that suppresses reverse current from flowing into the output unit of the first conversion power supply. The electric working machine can suppress the current output from the second conversion power supply from flowing into the output unit of the first conversion power supply. The first reverse current suppressing unit may also be formed using a switching element such as a diode or FET connected in series with the first conversion power supply, for example.

[0022] Next, in the above-mentioned electric working machine, the power supply for the control unit may include a first current path and a second current path. The first current path is a part of the current path from the power supply to the control unit, and is a current path including a first conversion power supply. The second current path is a current path connected in parallel with the first current path and including a second conversion power supply.

[0023] The first conversion power supply and the second conversion power supply are each configured to convert the power supply power voltage into control unit power having a control unit voltage lower than the power supply voltage output by the power supply, and to supply the control unit power after the voltage conversion.

[0024] The first conversion state of the control unit power supply may be a state in which the control unit power is supplied to the control unit via at least the first current path and using the first conversion power supply. The second conversion state of the control unit power supply may be a state in which the voltage conversion of the first conversion power supply is stopped and the control unit power is supplied to the control unit via at least the second current path and using the second conversion power supply.

[0025] For this electric working machine, when the control unit is in the low power operation state, the control unit power supply is changed to the second conversion state, and the voltage conversion using the first conversion power supply is stopped, so that the power consumption in the first conversion power supply can be suppressed. Therefore, when the electric working machine is not in use, when the operation state of the control unit is changed from the control operation state to the low power operation state, not only the power consumption in the control unit can be reduced, but also the power consumption in the first conversion power supply can be reduced, so the power consumption when the electric working machine is not in use can be reduced.

[0026] Furthermore, the electric working machine may further include a second reverse current suppressing unit configured to suppress a reverse current from flowing into an output unit of the second conversion power supply between the second conversion power supply and the control unit in the second current path.

[0027] The electric working machine can suppress the current output from the first conversion power supply from flowing as reverse current to the output unit of the second conversion power supply. The second reverse current suppressing unit may be configured using a switching element such as a diode or FET connected in series with the second conversion power supply.

[0028] In addition, in the above-mentioned electric working machine, the output voltage of the first conversion power supply and the output voltage of the second conversion power supply may have the same voltage value. In either case of using the first conversion power supply or the second conversion power supply, the electric working machine can maintain the applied voltage applied to the control unit constant, and can suppress malfunction of the control unit caused by fluctuations in the applied voltage when switching between the first conversion power supply and the second conversion power supply.

[0029] In addition, in the above-mentioned electric working machine, the operation state determination unit may be configured to receive a first state notification signal and a second state notification signal, and when the first state notification signal is received, the operation state of the control unit is determined to be a control operation state, and when the second state notification signal is received, the operation state of the control unit is determined to be a low-power operation state. The first state notification signal is a notification signal indicating that the operation state of the control unit is a control operation state. The second state notification signal is a notification signal indicating that the operation state of the control unit is a low-power operation state. In the electric working machine, the operation state determination unit can determine the operation state of the control unit based on the first state notification signal and the second state notification signal.

[0030] In the above-mentioned electric working machine, the power supply for the control unit may include a third current path, a bypass current path, and a common current path. The third current path is a part of the current path from the power supply to the control unit, and is a current path including a first conversion power supply. The bypass current path is a current path connected in parallel with the third current path. The common current path is a current path connected in series with the third current path and the bypass current path, respectively, and including a second conversion power supply.

[0031] The first conversion power supply is configured to convert the power supply power voltage into an intermediate power supply power and to supply the intermediate power supply power after the voltage conversion. The intermediate power supply power is power supplied at an intermediate power supply voltage lower than the power supply voltage output by the power supply.

[0032] The second conversion power supply is configured to convert the power supply power or the intermediate power supply power voltage into the control unit power and supply the voltage-converted control unit power. The control unit power is power supplied at a control unit voltage lower than the intermediate power supply voltage.

[0033] The first conversion state of the control unit power supply is a state in which the control unit power is supplied to the control unit using the first conversion power supply and the second conversion power supply via at least the third current path and the common current path. The second conversion state of the control unit power supply is a state in which the voltage conversion of the first conversion power supply is stopped and the control unit power is supplied to the control unit using the second conversion power supply via at least the bypass current path and the common current path.

[0034] In the case where the control unit of the electric working machine is in the low power operation state, the control unit power supply is changed to the second conversion state, and the voltage conversion using the first conversion power supply is stopped, so that the power consumption in the first conversion power supply can be suppressed. Therefore, when the electric working machine is not in use, when the operation state of the control unit is changed from the control operation state to the low power operation state, not only the power consumption in the control unit can be reduced, but also the power consumption in the first conversion power supply can be reduced, so the power consumption when the electric working machine is not in use can be reduced.

[0035] In addition, in the above-mentioned electric working machine, the operation state determination unit may be configured to determine whether the bypass current flowing in the bypass current path is greater than a predetermined operation reference value. Furthermore, the operation state determination unit may be configured to determine that the operation state of the control unit is a control operation state when the bypass current is greater than the operation reference value, and to determine that the operation state of the control unit is a low-power operation state when the bypass current is less than the operation reference value. For this electric working machine, the operation state determination unit can determine the operation state of the control unit based on the comparison result between the bypass current and the operation reference value.

[0036] In addition, in the above-mentioned electric working machine, the operation state determination unit is configured to be able to receive a first state notification signal and a second state notification signal, and can determine that the operation state of the control unit is a control operation state when the bypass current is greater than the operation reference value or the first state notification signal is received, and can determine that the operation state of the control unit is a low-power operation state when the bypass current is less than the operation reference value and the second state notification signal is received. The first state notification signal is a notification signal indicating that the operation state of the control unit is a control operation state. The second state notification signal is a notification signal indicating that the operation state of the control unit is a low-power operation state. In the electric working machine, in addition to the comparison result between the bypass current and the operation reference value, the operation state determination unit can also determine the operation state of the control unit based on the first state notification signal and the second state notification signal.

[0037] Furthermore, in the electric working machine, the power supply may include a plurality of battery packs and a plurality of voltage output units that output different voltages, and the first conversion power supply and the second conversion power supply may respectively convert the output voltage of any one of the plurality of voltage output units.

[0038] That is, by adopting a configuration including a plurality of battery packs, the maximum output voltage can be increased according to the number of battery packs, so that the electric working machine can perform an operation with a higher output based on a higher voltage.

[0039] In such an electric working machine, when the control unit is in a low-power operating state, the first conversion power supply is not used when the control unit uses a power supply to convert the voltage. Therefore, the power consumption in the first conversion power supply can be suppressed, and the power consumption when the electric working machine is not in use can be reduced.

[0040] In addition, in the above-mentioned electric working machine, the second conversion power supply may be connected to the voltage output unit with the smallest output voltage among the plurality of voltage output units. Thus, the voltage change amount of the voltage conversion in the second conversion power supply can be reduced, and the power loss associated with the voltage conversion can be reduced compared to the case where the voltage change amount is larger.

[0041] Furthermore, in the above-mentioned electric working machine, the first conversion power supply may be connected to a voltage output unit among the plurality of voltage output units, the output voltage of which is larger than the output voltage of the voltage output unit to which the second conversion power supply is connected. Thus, the amount of electric power that can be output from the first conversion power supply is larger than the amount of electric power that can be output from the second conversion power supply, and the first conversion power supply can supply sufficient electric power to the control unit compared to the second conversion power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a perspective view of the electric working machine according to the embodiment.

[0043] Figure 2 It is a block diagram showing the electrical configuration of the electric working machine according to the first embodiment.

[0044] Figure 3 This is a timing chart showing the relationship between switching of the operating state in the control unit and the current consumption in the power supply for the control unit according to the first embodiment.

[0045] Figure 4 It is a block diagram showing the electrical configuration of the electric working machine according to the second embodiment.

[0046] Figure 5 1 is a timing chart showing the relationship between switching of the operating state in the control unit and the current consumption in the second control unit power supply according to the second embodiment.

[0047] Figure 6 It is a block diagram showing the electrical configuration of an electric working machine according to a third embodiment.

[0048] Figure 7 1 is a timing chart showing the relationship between switching of the operating state in the control unit and the current consumption in the third control unit power supply according to the third embodiment.

[0049] Figure 8 It is a block diagram showing the electrical configuration of an electric working machine according to a fourth embodiment.

[0050] Fig. 9 1 is a timing chart showing the relationship between switching of the operating state in the control unit and the current consumption in the fourth control unit power supply according to the fourth embodiment.

[0051] Fig.10 It is a block diagram showing the electrical configuration of an electric working machine according to a fifth embodiment.

[0052] Fig.11 It is a block diagram showing the electrical configuration of an electric working machine according to a sixth embodiment.

[0053] Explanation of symbols:

[0054] 1…electric working machine, 9…trigger operation unit, 21…second electric working machine, 23…third electric working machine, 25…fourth electric working machine, 27…fifth electric working machine, 29…sixth electric working machine, 61…motor, 62…control unit, 63…motor driving unit, 64…power supply for control unit, 65…first conversion power supply, 67…first switch unit, 69…first reverse current suppressing unit, 71…second conversion power supply, 73…second reverse current suppressing unit, 75…action state determination unit, 81…constant voltage supply line, 91…power supply for second control unit, 93…third conversion power supply, 95…fourth conversion power supply, 97…brushless motor, 99…motor driver, 100…battery pack, 102…multi-output power supply, 111…power supply for third control unit. 113 ...reverse current suppressing unit, 115 ...bypass current determining unit, 121 ...fourth control unit power supply, 131 ...second bypass current determining unit, 141 ...fifth control unit power supply, 151 ...sixth control unit power supply. DETAILED DESCRIPTION

[0055] Hereinafter, embodiments to which the present invention is applied will be described using the drawings.

[0056] Furthermore, the present invention is not limited to the following embodiments, and may take various forms as long as they belong to the technical scope of the present invention.

[0057] [1. First embodiment]

[0058] [1-1. Overall structure]

[0059] Figure 1 The electric working machine 1 shown is configured as, for example, a rechargeable impact drill. The rechargeable impact drill is driven by power supplied from a battery pack 100 described later. The rechargeable impact drill is used, for example, to rotate a fastening member such as a screw or a bolt. The rechargeable impact drill is configured to apply an impact in the rotation direction according to a load when the fastening member is rotated, thereby being able to generate a large torque in the rotation direction.

[0060] like Figure 1 As shown in FIG. 1 , the electric working machine 1 of the present embodiment includes a main body 2 and a battery pack 100 . The battery pack 100 is configured to be attachable to and detachable from the main body 2 .

[0061] The main body 2 includes a housing 3. The housing 3 includes two housings 3a and 3b divided into left and right parts, and is formed by combining the two housings 3a and 3b. The housing 3 may be, for example, an injection-molded component made of resin.

[0062] The main body 2 includes a first housing portion 5, a handle portion 6, and a second housing portion 7. The first housing portion 5 is provided with a clamping sleeve 8, an LED 10, and a rotation direction switching operation portion 11. The LED 10 irradiates light to the outside of the electric working machine 1. The handle portion 6 is extended from the first housing portion 5. The second housing portion 7 is extended from the handle portion 6. The second housing portion 7 is provided with a battery mounting portion 7a, and the battery mounting portion 7a is used for mounting and dismounting the battery pack 100.

[0063] The battery pack 100 includes a secondary battery (not shown) that can be repeatedly charged and discharged. The secondary battery may be, for example, a lithium-ion battery or a secondary battery of a different type from a lithium-ion battery. The output voltage VB (hereinafter also referred to as the battery voltage VB) of the battery pack 100 is 36 [V].

[0064] When the user of the electric working machine 1 uses the electric working machine 1, the user holds the handle 6. The handle 6 is provided with a trigger operation unit 9. The user can pull the trigger operation unit 9 with a finger while holding the handle 6 (trigger-on operation).

[0065] [1-2. Electrical structure of electric working machine]

[0066] Reference Figure 2 The electrical structure of the electric working machine 1 will be described. Figure 2 The electrical structure of the electric working machine 1 in which the battery pack 100 is mounted on the main body 2 is shown.

[0067] like Figure 2 As shown, the electric working machine 1 includes a motor 61, a control unit 62, a motor driving unit 63, a control unit power supply 64, and an operating state determination unit 75. The electric working machine 1 includes a motor current path LM, a voltage conversion path LC, a first current path LC1, and a second current path LC2.

[0068] The motor power path LM is a power path from the positive electrode of the battery pack 100 to the negative electrode of the battery pack 100 via the motor 61 and the motor driving unit 63. The first end of the voltage conversion path LC is connected to the first branch point P1 of the motor power path LM, and the second end is connected to the control unit power supply 64 (more specifically, the second branch point P2). The first current path LC1 and the second current path LC2 are provided in the control unit power supply 64.

[0069] The motor 61 is a brushed motor and is driven by current energization using power supplied from the battery pack 100 through the motor energizing path LM.

[0070] The motor driving unit 63 is configured to include a switch unit (FET, etc.) connected in series with the motor power path LM. The motor driving unit 63 switches the switch unit to a power-on state (on state) or a non-power-on state (off state) based on the motor driving instruction Smd from the control unit 62, and can switch the motor power path LM to a power-on state or a non-power-on state.

[0071] The control unit 62 is configured to include a microcomputer including a CPU, a recording unit (ROM, RAM), a signal input / output unit, etc. The control unit 62 receives power supply via a constant voltage supply line 81 described later. The control unit 62 performs various processes by executing various programs stored in the recording unit by the CPU. The various processes include, for example, a motor control process for controlling the motor 61 according to the motor drive instruction Smd, an abnormality determination process for determining whether an abnormality occurs in the electric working machine 1, and an action state switching process for switching the action state of the control unit 62 to any one of a plurality of action states.

[0072] In addition, as a plurality of operating states, at least a control operating state and a low-power operating state are included. The control operating state is an operating state in which motor control processing, abnormality determination processing, etc. can be performed. In the control operating state, the control unit 62 performs AD conversion on the measurement signals from various sensors (not shown) that measure the states of various parts in the electric working machine 1 (motor temperature, motor current, etc.) to perform abnormality determination processing, etc. In the case of the control operating state, the constant voltage Vcc supplied from the constant voltage supply line 81 becomes the reference voltage for AD conversion, so a higher voltage accuracy is required to reduce the voltage error. The low-power operating state is an operating state with lower power consumption than the control operating state. The low-power operating state is a so-called sleep state, which is an operating state in which the power consumption in the control unit 62 is reduced. The control unit 62 does not perform AD conversion, etc. in the low-power operating state, and does not perform comparison processing between the reference voltage (constant voltage Vcc) and the measurement signals of various sensors. In the case of the low-power operating state, the constant voltage Vcc supplied from the constant voltage supply line 81 is not used as the reference voltage for AD conversion, so the required voltage accuracy becomes lower than that in the control operating state. The maximum current consumption of the control unit 62 in the control operation state (maximum current ICmax in control) is 100 mA, and the maximum current consumption of the control unit 62 in the low power operation state (maximum current ISmax in low power) is 50 μA.

[0073] The control unit 62 is configured to change the operating state of the control unit 62 from the control operating state to the low power operating state when the user continues to perform no operation (such as operation of the trigger operating unit 9 ) within a predetermined sleep determination time Ts (eg, 5 minutes).

[0074] The control unit 62 is configured to output a state notification signal Smo corresponding to the operation state being executed. That is, when the control operation state is changed, the control unit 62 outputs a state notification signal Smo indicating that it is the control operation state (hereinafter, also referred to as the first state notification signal Smo1), and when the low power operation state is changed, the control unit 62 outputs a state notification signal Smo indicating that it is the low power operation state (hereinafter, also referred to as the second state notification signal Smo2). The control unit 62 outputs the state notification signal Smo to at least the control unit power supply 64 (specifically, the first reverse current suppression unit 69 described later) and the operation state determination unit 75.

[0075] The trigger operation unit 9 is configured to output a trigger signal Str when the user performs a pulling operation. The trigger operation unit 9 outputs a trigger signal Str having the same potential as the ground potential during the pulling operation by the user. The trigger signal Str is output to at least the control unit 62 and the operation state determination unit 75.

[0076] Operation state determination unit 75 is configured to determine whether the operation state of control unit 62 is the control operation state or the low power operation state. Operation state determination unit 75 receives state notification signal Smo and trigger signal Str as inputs, and outputs energization instruction signal Sc1 according to the states of state notification signal Smo and trigger signal Str.

[0077] The operation state determination unit 75 is configured to determine that the operation state of the control unit 62 is the control operation state when the first state notification signal Smo1 is input or the trigger signal Str is input (in other words, the user is performing a pulling operation). The operation state determination unit 75 is configured to determine that the operation state of the control unit 62 is the low current operation state when the second state notification signal Smo2 is input but the trigger signal Str is not input (in other words, the user is not performing a pulling operation). The operation state determination unit 75 is configured to output a power-on instruction signal Sc1 corresponding to the determination result.

[0078] [1-3. Power supply for control unit]

[0079] The control unit power supply 64 performs voltage conversion on the battery voltage VB from the battery pack 100, and outputs the constant voltage Vcc after the voltage conversion to the constant voltage supply line 81. The constant voltage Vcc is supplied to each part of the electric working machine 1 (control unit 62, etc.) via the constant voltage supply line 81. In the present embodiment, the constant voltage Vcc is 5 [V]. The power supplied from the control unit power supply 64 via the constant voltage supply line 81 is used as, for example, operating power for the control unit 62, etc.

[0080] The control unit power supply 64 includes a first conversion power supply 65 , a first switch unit 67 , a first reverse current suppressing unit 69 , a second conversion power supply 71 , a second reverse current suppressing unit 73 , a first current path LC1 , and a second current path LC2 .

[0081] The first current path LC1 is a part of the current path from the battery pack 100 to the control unit 62, and is a current path having the first conversion power supply 65. The second current path LC2 is a current path connected in parallel with the first current path LC1 and having the second conversion power supply 71. The first end of the first current path LC1 and the first end of the second current path LC2 are respectively connected to the second branch point P2 and connected to the voltage conversion path LC. The second end of the first current path LC1 and the second end of the second current path LC2 are respectively connected to the third branch point P3 and connected to the constant voltage supply line 81.

[0082] On the first current path LC1 , the first switch unit 67 , the first conversion power supply 65 , and the first reverse current suppressing unit 69 are arranged in this order from the second branch point P2 to the third branch point P3 .

[0083] The first conversion power supply 65 has a DC-DC converter that performs voltage conversion on a DC voltage and outputs it. The first conversion power supply 65 performs voltage conversion on the battery voltage VB input to the input section 65a, and outputs the constant voltage Vcc after the voltage conversion from the output section 65b. The first conversion power supply 65 outputs 5V as the constant voltage Vcc. The constant voltage Vcc is supplied to each part of the electric working machine 1 (control section 62, etc.) via the constant voltage supply line 81. The first conversion power supply 65 has a performance of a maximum output current of more than 100mA when performing voltage conversion, and is configured to be able to supply the maximum consumption current (maximum current during control ICmax) in the control section 62 that controls the action state. The power consumption required for the voltage conversion in the first conversion power supply 65 is the power consumption corresponding to the consumption current of the mA order.

[0084] The first switch unit 67 is provided between the second branch point P2 in the first current path LC1 and the first conversion power supply 65. The first switch unit 67 is configured to include a switch unit (FET, etc.) connected in series with the first current path LC1. The first switch unit 67 is configured to be able to switch the switch unit to a power-on state (on state) or a non-power-on state (off state) based on a power-on command signal Sc1 from an action state determination unit 75. The first switch unit 67 is configured to be able to switch to a power-on state or a non-power-on state for power flow from the second branch point P2 in the first current path LC1 toward the first conversion power supply 65. Thus, the first switch unit 67 is configured to be able to switch the input state of the battery voltage VB to the first conversion power supply 65 based on the power-on command signal Sc1.

[0085] The first reverse current suppression unit 69 is provided between the first conversion power supply 65 and the third branch point P3 in the first current path LC1. The first reverse current suppression unit 69 is configured to include a diode 69a connected in series with the first current path LC1, and a switch unit 69b connected in parallel with the diode 69a. The diode 69a allows power to be supplied from the first conversion power supply 65 to the third branch point P3, and suppresses power to be supplied from the third branch point P3 to the first conversion power supply 65. Here, when the switch unit 69b is a FET, a parasitic diode that is inevitably present in the FET may also be used as the diode 69a. The first reverse current suppression unit 69 is configured to switch the switch unit to a power-on state (on state) or a non-power-on state (off state) based on a state notification signal Smo from the control unit 62, and switch the first current path LC1 to a power-on state or a non-power-on state.

[0086] Thus, the first reverse current suppressing unit 69 is turned into a non-energized state through the switch unit 69b, and allows the current from the output unit 65b of the first conversion power supply 65 to be energized to the constant voltage supply line 81 via the diode 69a, and can suppress the reverse current from the third branch point P3 to the output unit 65b of the first conversion power supply 65. In addition, when the current is energized from the output unit 65b to the constant voltage supply line 81 through the diode 69a, the constant voltage Vcc output from the output unit 65b is reduced by the forward voltage (Vf) of the diode 69a, and is output to the constant voltage supply line 81. In addition, the first reverse current suppressing unit 69 is turned into an energized state through the switch unit 69b, and the constant voltage Vcc output from the output unit 65b of the first conversion power supply 65 does not generate a voltage drop due to the diode 69a, and is turned into a state of outputting the constant voltage Vcc to the constant voltage supply line 81.

[0087] On the second current path LC2 , the second conversion power supply 71 and the second reverse current suppressing unit 73 are arranged in order from the second branch point P2 to the third branch point P3 .

[0088] The second conversion power supply 71 has a series regulator that converts a DC voltage and outputs it. The second conversion power supply 71 converts the battery voltage VB input to the input part 71a, and outputs the constant voltage Vcc after the voltage conversion from the output part 71b. The second conversion power supply 71 outputs 5 [V] as the constant voltage Vcc. The constant voltage Vcc is supplied to each part of the electric working machine 1 (control part 62, etc.) via the constant voltage supply line 81. The second conversion power supply 71 is configured to have a maximum output current of 50 μA or more when performing voltage conversion, and can supply the maximum consumption current (maximum current ISmax at low power) in the control part 62 in the low power operation state. The power consumption required for the voltage conversion in the second conversion power supply 71 is the power consumption corresponding to the consumption current of the μA order. The second conversion power supply 71 is configured so that the maximum output current is less than the maximum current ICmax during control, so the power consumption required for voltage conversion is smaller than that of the first conversion power supply 65.

[0089] The second reverse current suppressing unit 73 is provided between the second conversion power supply 71 and the third branch point P3 in the second current path LC2. The second reverse current suppressing unit 73 is configured to include a diode connected in series with the second current path LC2. The diode is configured to allow power to be supplied from the second conversion power supply 71 to the third branch point P3, and to suppress power to be supplied from the third branch point P3 to the second conversion power supply 71. Therefore, the second reverse current suppressing unit 73 allows a voltage obtained by reducing the forward voltage (Vf) of the diode from the constant voltage Vcc to be output from the output unit 71b of the second conversion power supply 71 to the constant voltage supply line 81, and suppresses reverse current from flowing from the third branch point P3 to the output unit 71b of the second conversion power supply 71.

[0090] With respect to the control unit power supply 64 constructed in this way, when a power-on instruction signal Sc1 indicating a control action state is input from the action state determination unit 75, the first conversion power supply 65 and the second conversion power supply 71 are used to output a constant voltage Vcc, thereby switching to a state in which control unit power is supplied to the control unit 62 (hereinafter also referred to as the first conversion state).

[0091] In addition, when a power-on command signal Sc1 indicating a low-power action state is input from the action state determination unit 75, the control unit power supply 64 stops the voltage conversion of the first conversion power supply 65 and uses the second conversion power supply 71 to output a constant voltage Vcc, thereby changing to a state in which control unit power is supplied to the control unit 62 (hereinafter also referred to as the second conversion state).

[0092] [1-4. Changes in current consumption associated with switching of operating states in the control unit]

[0093] Next, use Figure 3The following describes how the current consumption Ia in the control unit power supply 64 changes as the operating state in the control unit 62 is switched.

[0094] Figure 3 In FIG. 1 , the time point when the user completes the pulling operation of the trigger operation unit 9 is set as time t0, and the switching of the operating state of the control unit 62 and the change of the consumption current Ia accompanying the passage of time are shown.

[0095] If the user continues not pulling the trigger operation unit 9 during the period from time t0 to time t1 after the sleep determination time Ts has elapsed, the control unit 62 starts processing for changing the operation state from the control operation state to the low power operation state (operation state switching processing).

[0096] When the operation state switching process is started, the control unit 62 first performs the following process: the power supply to various devices and various circuits provided in the electric working machine 1 is stopped. Along with this, the consumption current Ia gradually decreases from the initial consumption current Ia0 (time t1 to t2), and the current equivalent to the current consumption amount (first current change amount ΔIa1) in the various devices before the stop is reduced, and the consumption current Ia at this time is reduced to the first consumption current Ia1.

[0097] Next, as a step in the operation state switching process, the control unit 62 performs a process of outputting a state notification signal Smo indicating that the low power operation state is in progress (time t2). As a result, the voltage conversion of the first conversion power supply 65 is stopped, and the current corresponding to the current consumption amount (second current change amount ΔIa2) required for the voltage conversion in the first conversion power supply 65 is reduced, and the current consumption Ia at this time is reduced to the second current consumption Ia2.

[0098] Next, as a step in the operation state switching process, the control unit 62 executes a process of switching the control unit 62 itself to the low power operation state (sleep mode) (time t3). As a result, a current equivalent to the current consumption amount (third current change amount ΔIa3) equivalent to the difference between the current consumption amount in the control operation state and the current consumption amount in the low power operation state in the control unit 62 is reduced, and the current consumption Ia at this time is reduced to the third current consumption Ia3.

[0099] By executing these operations, the control unit 62 completes the operation state switching process and maintains the low-power operation state until the user pulls the trigger operation unit 9 .

[0100] Afterwards, when the user pulls the trigger operation unit 9 (time t4), the trigger signal Str is input to the control unit 62. As a result, the control unit 62 itself changes (wakes up) from the low-power operation state (sleep mode) to the control operation state. Then, the awakened control unit 62 starts the operation state switching process for changing the operation state from the low-power operation state to the control operation state. In addition, when the trigger signal Str from the trigger operation unit 9 is also input to the operation state determination unit 75, and the power-on command signal Sc1 from the operation state determination unit 75 is input to the control unit power supply 64, the voltage conversion of the first conversion power supply 65 is started. Therefore, accompanied by the awakening of the control unit 62 and the voltage conversion operation of the first conversion power supply 65, the consumption current Ia gradually increases to the first consumption current Ia1 (time t4~t5).

[0101] Next, as a step of the operation state switching process, the control unit 62 performs a process of outputting a state notification signal Smo (first state notification signal Smo1) indicating that it is a control operation state (time t5). As a result, the constant voltage Vcc output from the output unit 65b of the first conversion power supply 65 is supplied to the constant voltage supply line 81 without causing a voltage drop.

[0102] Next, as a step in the operation state switching process, the control unit 62 executes a process of sequentially starting power supply to various devices and circuits included in the electric working machine 1 (time t6 ). Along with this, the consumption current Ia increases to the initial consumption current Ia0 .

[0103] As described above, the electric working machine 1 of this embodiment can reduce the current consumption Ia corresponding to the second current change amount ΔIa2 by stopping the voltage conversion in the first conversion power supply 65 when the operating state in the control unit 62 changes to the low-power operating state.

[0104] [1-5. Effect]

[0105] As described above, in the electric working machine 1 of the present embodiment, when the control unit 62 is in the low-power operation state, the control unit power supply 64 is changed to the second conversion state, and the first conversion power supply 65 is not used when the voltage conversion in the control unit power supply 64 is performed, so that the power consumption in the first conversion power supply 65 can be suppressed. Therefore, when the operation state of the control unit 62 is changed from the control operation state to the low-power operation state when the electric working machine 1 is not used, not only the power consumption in the control unit 62 can be reduced, but also the power consumption in the first conversion power supply 65 can be reduced, so the power consumption when the electric working machine 1 is not used can be reduced.

[0106] Next, in the electric working machine 1, the control unit power supply 64 is configured to change the operating state to the first conversion state when the user operates the electric working machine 1 (for example, pulling the trigger operating unit 9). That is, when the operating state of the control unit power supply 64 is the second conversion state, when the user operates the trigger operating unit 9, the control unit power supply 64 changes the operating state of the control unit power supply 64 from the second conversion state to the first conversion state. As a result, the control unit 62 is supplied with a constant voltage Vcc from at least the first conversion power supply 65, and thus can receive the supply of the maximum current ICmax required for control in the control operating state, and can realize the control of the motor 61.

[0107] Next, since the electric working machine 1 includes the first reverse current suppressing unit 69, it is possible to suppress the reverse current from flowing into the output unit 65b of the first conversion power supply 65. Therefore, for the electric working machine 1, the first reverse current suppressing unit 69 can suppress the current output from the second conversion power supply 71 from flowing into the output unit 65b of the first conversion power supply 65 via the third branch point P3.

[0108] Next, since the electric working machine 1 includes the second reverse current suppressing unit 73, it is possible to suppress the reverse current from flowing into the output unit 71b of the second conversion power supply 71. Therefore, for the electric working machine 1, the second reverse current suppressing unit 73 can suppress the current output from the first conversion power supply 65 from flowing into the output unit 71b of the second conversion power supply 71 via the third branch point P3.

[0109] In the electric working machine 1, the output voltage (constant voltage Vcc=5[V]) of the first conversion power supply 65 and the output voltage (constant voltage Vcc=5[V]) of the second conversion power supply 71 are the same voltage value, and the first reverse current suppressing unit 69 is provided with a switch unit 69b in parallel with the diode 69a, and the second reverse current suppressing unit 73 is composed of a diode. Therefore, when the control unit 62 is in the control operation state, the first conversion power supply 65 and the second conversion power supply 71 both output voltages, and the switch 69b is turned on, the voltage output from the first conversion power supply 65 to the constant voltage supply line 81 and the voltage output from the second conversion power supply 71 to the constant voltage supply line 81 via the second reverse current suppressing unit 73 are different values. Specifically, when the control unit 62 is in the control operation state, the voltage output from the first conversion power supply 65 to the constant voltage supply line 81 is the constant voltage Vcc, whereas the voltage output from the second conversion power supply 71 to the constant voltage supply line 81 via the second reverse current suppressing unit 73 is a voltage reduced by the forward voltage (Vf) of the diode relative to the constant voltage Vcc. Therefore, when the control unit 62 is in the control operation state, since only the voltage output from the first conversion power supply 65 is supplied to the control unit 62, it is possible to suppress the state where the maximum consumption current of the control unit 62 is supplied from the second conversion power supply 71 that does not have the supply capacity.

[0110] In addition, in the electric working machine 1, the operation state determination unit 75 is configured to be able to receive the first state notification signal Smo1 and the second state notification signal Smo2. When the first state notification signal Smo1 is received, the operation state determination unit 75 determines that the operation state of the control unit 62 is the control operation state, and when the second state notification signal Smo2 is received, the operation state determination unit 75 determines that the operation state of the control unit 62 is the low power operation state. That is, the operation state determination unit 75 can determine the operation state of the control unit 62 based on the first state notification signal Smo1 and the second state notification signal Smo2.

[0111] [1-6. Correspondence of terms]

[0112] Here, the correspondence relationship between the terms is explained.

[0113] The electric working machine 1 corresponds to an example of an electric working machine, the motor 61 corresponds to an example of a driving unit, and the battery pack 100 corresponds to an example of a power source.

[0114] The control unit 62 and the motor drive unit 63 are equivalent to an example of a control unit, the power supply 64 for the control unit is equivalent to an example of a power supply for the control unit, the first conversion power supply 65 is equivalent to an example of a first conversion power supply, the second conversion power supply 71 is equivalent to an example of a second conversion power supply, and the action state determination unit 75 is equivalent to an example of an action state determination unit.

[0115] The first reverse current suppressing unit 69 is equivalent to an example of a first reverse current suppressing unit, the second reverse current suppressing unit 73 is equivalent to an example of a second reverse current suppressing unit, the first current path LC1 is equivalent to an example of a first current path, and the second current path LC2 is equivalent to an example of a second current path.

[0116] [2. Second Embodiment]

[0117] As a second embodiment, a second electric working machine 21 configured by replacing a part of the components of the electric working machine 1 of the above-described embodiment (hereinafter also referred to as the first embodiment) will be described.

[0118] like Figure 4 As shown, the second electric working machine 21 is configured by replacing the control unit power supply 64, the motor 61, and the motor driver 63 in the electric working machine 1 with a second control unit power supply 91, a brushless motor 97, and a motor driver 99, respectively.

[0119] [2-1. Power supply for the second control unit]

[0120] The second control unit power supply 91 is configured to include a third conversion power supply 93 and a fourth conversion power supply 95 instead of the first conversion power supply 65 in the control unit power supply 64 .

[0121] The third conversion power supply 93 has a DC-DC converter that converts a DC voltage and outputs it. The third conversion power supply 93 converts the battery voltage VB input to the input unit 93a, and outputs the second constant voltage Vdd after the voltage conversion from the output unit 93b. The third conversion power supply 93 outputs 15 [V] as the second constant voltage Vdd. When the third conversion power supply 93 performs voltage conversion, the maximum output current is 150 mA.

[0122] The fourth conversion power supply 95 has a series regulator that converts a DC voltage and outputs it. The fourth conversion power supply 95 converts the second constant voltage Vdd input to the input part 95a, and outputs the constant voltage Vcc after the voltage conversion from the output part 95b. The fourth conversion power supply 95 outputs 5V as the constant voltage Vcc. When the fourth conversion power supply 95 performs voltage conversion, the maximum output current is 100mA.

[0123] That is, the second control unit power supply 91 is configured to be able to convert the battery voltage VB into a constant voltage Vcc using the third conversion power supply 93 and the fourth conversion power supply 95. The constant voltage Vcc is supplied to each part (control unit 62, etc.) of the second electric working machine 21 via the constant voltage supply line 81. The power consumption required for voltage conversion in the third conversion power supply 93 and the fourth conversion power supply 95 is the power consumption corresponding to the consumption current of the mA order.

[0124] With respect to the second control unit power supply 91 constructed in this manner, when a power-on instruction signal Sc1 indicating a control action state is input from the action state determination unit 75, the third conversion power supply 93 and the fourth conversion power supply 95 are used to output a constant voltage Vcc, and the second conversion power supply 71 is used to output a constant voltage Vcc, thereby transitioning to a state in which power for the control unit is supplied to the control unit 62 (hereinafter also referred to as a first conversion state).

[0125] In addition, for the second control unit power supply 91, when a power-on command signal Sc1 indicating a low-power operation state is input from the operation state determination unit 75, the voltage conversion of the third conversion power supply 93 and the fourth conversion power supply 95 is stopped, and the second conversion power supply 71 is used to output a constant voltage Vcc, thereby changing to a state in which power for the control unit is supplied to the control unit 62 (hereinafter also referred to as the second conversion state).

[0126] The brushless motor 97 is configured as a three-phase brushless motor. The motor driver 99 converts the DC current from the battery pack 100 into a three-phase AC current (U-phase drive current, V-phase drive current, and W-phase drive current) for driving the brushless motor 97, and outputs it to the brushless motor 97. The motor driver 99 drives the brushless motor 97 according to the motor drive command Smd input from the control unit 62.

[0127] [2-2. Changes in current consumption associated with switching of operating states in the control unit]

[0128] Next, use Figure 5 A description will be given of a change in the current consumption Ia in the second control unit power supply 91 associated with the switching of the operating state in the control unit 62 .

[0129] Figure 5 , the time point when the user completes the pulling operation of the trigger operation unit 9 is set as time t0, and the switching of the operating state of the control unit 62 and the change of the consumption current Ia with the passage of time are shown.

[0130] If the user continues not pulling the trigger operation unit 9 during the period from time t0 to time t11 after the sleep determination time Ts has elapsed, the control unit 62 starts processing for changing the operation state from the control operation state to the low power operation state (operation state switching processing).

[0131] When the operation state switching process is started, the control unit 62 first executes a process of sequentially stopping the power supply to various devices and various circuits provided in the second electric working machine 21. Accompanying this, the consumption current Ia gradually decreases from the tenth consumption current Ia10 (time t11-t12), and the current equivalent to the current consumption amount (first current change amount ΔIa11) in the various devices before the stop is reduced, and the consumption current Ia at this time is reduced to the eleventh consumption current Ia11.

[0132] Next, as a step in the operation state switching process, the control unit 62 performs a process of outputting a state notification signal Smo indicating that the low power operation state is in progress (time t12). As a result, the voltage conversion of the third conversion power supply 93 and the fourth conversion power supply 95 is stopped, and the current corresponding to the current consumption amount (second current change amount ΔIa12) required for the voltage conversion in the third conversion power supply 93 and the fourth conversion power supply 95 is reduced, and the consumption current Ia at this time is reduced to the twelfth consumption current Ia12.

[0133] Next, as a step in the operation state switching process, the control unit 62 executes a process of switching the control unit 62 itself to the low power operation state (sleep mode) (time t13). As a result, a current equivalent to the current consumption amount (third current change amount ΔIa13) equivalent to the difference between the current consumption amount in the control operation state and the current consumption amount in the low power operation state in the control unit 62 is reduced, and the current consumption Ia at this time is reduced to the thirteenth current consumption Ia13.

[0134] By executing these operations, the control unit 62 completes the operation state switching process and maintains the low-power operation state until the user pulls the trigger operation unit 9 .

[0135] Afterwards, when the user performs a pulling operation of the trigger operation unit 9 (time t14), the trigger signal Str is input to the control unit 62. As a result, the control unit 62 itself changes (wakes up) from the low-power operation state (sleep mode) to the control operation state. Then, the awakened control unit 62 starts the operation state switching process for changing the operation state from the low-power operation state to the control operation state. In addition, the trigger signal Str from the trigger operation unit 9 is also input to the operation state determination unit 75, and the power-on command signal Sc1 from the operation state determination unit 75 is input to the second control unit power supply 91, thereby starting the voltage conversion of the third conversion power supply 93 and the fourth conversion power supply 95. Therefore, accompanied by the awakening of the control unit 62 and the voltage conversion operation of the third conversion power supply 93 and the fourth conversion power supply 95, the consumption current Ia gradually increases to the eleventh consumption current Ia11 (time t14~t15).

[0136] Next, as a step of the operation state switching process, the control unit 62 performs a process of outputting a state notification signal Smo (first state notification signal Smo1) indicating that the control operation state is in progress (time t15). As a result, the constant voltage Vcc output from the output unit 95b of the fourth conversion power supply 95 is supplied to the constant voltage supply line 81 without causing a voltage drop.

[0137] Next, as a step in the operation state switching process, the control unit 62 executes a process of sequentially starting power supply to various devices and circuits included in the second electric working machine 21 (time t16 ). Along with this, the consumption current Ia increases to the tenth consumption current Ia10 .

[0138] Thus, when the operating state of the second electric working machine 21 in the control unit 62 changes to the low-power operating state, the voltage conversion in the third and fourth converted power supplies 93 and 95 is stopped, thereby reducing the current consumption Ia corresponding to the second current change ΔIa12.

[0139] [2-3. Effect]

[0140] As described above, for the second electric working machine 21 of the second embodiment, when the control unit 62 is in the low-power operation state, the second control unit power supply 91 changes to the second conversion state, and when the voltage conversion in the second control unit power supply 91 is performed, the third conversion power supply 93 and the fourth conversion power supply 95 are not used, so that the power consumption of the third conversion power supply 93 and the fourth conversion power supply 95 can be suppressed. Therefore, when the operation state of the control unit 62 changes from the control operation state to the low-power operation state when the second electric working machine 21 is not used, not only the power consumption in the control unit 62 can be reduced, but also the power consumption in the third conversion power supply 93 and the fourth conversion power supply 95 can be reduced, so that the power consumption when the second electric working machine 21 is not used can be suppressed.

[0141] [2-4. Correspondence of terms]

[0142] Here, the correspondence relationship between the terms is explained.

[0143] The second electric working machine 21 is equivalent to an example of an electric working machine, the control unit 62 and the motor driver 99 are equivalent to an example of a control unit, the brushless motor 97 is equivalent to an example of a drive unit, the second control unit power supply 91 is equivalent to an example of a control unit power supply, and the third conversion power supply 93 and the fourth conversion power supply 95 are equivalent to an example of the first conversion power supply.

[0144] [3. Third embodiment]

[0145] As a third embodiment, a third electric working machine 23 in which a part of the components of the second electric working machine 21 of the second embodiment are replaced will be described.

[0146] like Figure 6 As shown, the third electric working machine 23 is configured by replacing the second control unit power supply 91 in the second electric working machine 21 with a third control unit power supply 111 .

[0147] [3-1. Power supply for the third control unit]

[0148] The third control unit power supply 111 performs voltage conversion on the battery voltage VB from the battery pack 100, and outputs the constant voltage Vcc after the voltage conversion to the constant voltage supply line 81. The constant voltage Vcc is supplied to each part (control unit 62, etc.) of the third electric working machine 23 via the constant voltage supply line 81. In the third embodiment, the constant voltage Vcc is 5 V. The power supplied from the third control unit power supply 111 via the constant voltage supply line 81 is used as, for example, operating power for the control unit 62, etc.

[0149] The third control unit power supply 111 includes a third conversion power supply 93, a first switch unit 67, a reverse current suppressing unit 113, a fourth conversion power supply 95, a bypass current determining unit 115, a third current path LC3, a bypass current path LC4, and a common current path LC5.

[0150] The third conversion power supply 93 , the first switch unit 67 , and the fourth conversion power supply 95 have the same structures as the third conversion power supply 93 , the first switch unit 67 , and the fourth conversion power supply 95 of the second embodiment, respectively.

[0151] The third current path LC3 is a part of the current path from the battery pack 100 to the control unit 62, and is a current path including the third conversion power supply 93. The bypass current path LC4 is a current path connected in parallel with the third current path LC3. The common current path LC5 is a current path directly connected to the third current path LC3 and the bypass current path LC4, and includes the fourth conversion power supply 95.

[0152] The first end of the third current path LC3 and the first end of the bypass current path LC4 are respectively connected to the fourth branch point P4 and connected to the voltage conversion path LC. The second end of the third current path LC3 and the second end of the bypass current path LC4 are respectively connected to the fifth branch point P5 and connected to the first end of the common current path LC5. The second end of the common current path LC5 is connected to the constant voltage supply line 81.

[0153] The reverse current suppressing unit 113 is provided between the third conversion power supply 93 and the fifth branch point P5 in the third current path LC3. The reverse current suppressing unit 113 is configured to include a diode connected in series with the third current path LC3. The diode is configured to allow power to be supplied from the third conversion power supply 93 to the fifth branch point P5, and to suppress power to be supplied from the fifth branch point P5 to the third conversion power supply 93. Therefore, the reverse current suppressing unit 113 is configured to allow a constant voltage Vcc to be output from the output unit 93b of the third conversion power supply 93 to the fifth branch point P5, and to suppress reverse current from the fifth branch point P5 to flow into the output unit 93b of the third conversion power supply 93.

[0154] The bypass current determination unit 115 is provided in the bypass current path LC4. The bypass current determination unit 115 includes a detection resistor 117 and a current determination unit 119. The detection resistor 117 includes a resistor element connected in series with the bypass current path LC4, and is configured to output a detection voltage corresponding to the bypass current Ibp flowing in the bypass current path LC4. The current determination unit 119 is configured to include an FET, and output a current notification signal Sia corresponding to the bypass current Ibp to the operation state determination unit 75 based on the voltage across the detection resistor 117.

[0155] In addition, when the first switch section 67 is turned off, when the operation state of the control section 62 is the control operation state, the power consumption in the control section 62 and the like via the constant voltage supply line 81 becomes large, and the bypass current Ibp becomes large, so the potential of the input section 95a of the fourth conversion power supply 95 becomes low. In addition, when the first switch section 67 is turned off, when the operation state of the control section 62 is the low power operation state, the power consumption in the control section 62 and the like via the constant voltage supply line 81 becomes small, and the bypass current Ibp becomes small, so the potential of the input section 95a of the fourth conversion power supply 95 becomes high.

[0156] The current determination unit 119 is configured to output a current notification signal Sia corresponding to the bypass current Ibp. When the bypass current Ibp is greater than a predetermined action reference value Ith (e.g., 5 [mA]), the FET is turned on, and the current determination unit 119 outputs a current notification signal Sia (hereinafter also referred to as a first current notification signal Sia1) having the same potential as the battery voltage VB. When the bypass current Ibp is less than the action reference value Ith, the FET is turned off, and the current determination unit 119 outputs a current notification signal Sia (hereinafter also referred to as a second current notification signal Sia2) having a potential lower than the battery voltage VB.

[0157] That is, the bypass current determination unit 115 is configured to determine whether the operation state of the control unit 62 is the control operation state or the low-power operation state based on the comparison result between the bypass current Ibp and the operation reference value Ith.

[0158] When the current determination unit 119 determines that the operation state of the control unit 62 is the control operation state, the current determination unit 119 outputs the first current notification signal Sia1 to the operation state determination unit 75. As a result, the operation state determination unit 75 outputs the power-on instruction signal Sc1 indicating that the control operation state is in progress to the first switch unit 67, and performs voltage conversion of the third conversion power supply 93. At this time, the third control unit power supply 111 outputs the constant voltage Vcc using the third conversion power supply 93 and the fourth conversion power supply 95, thereby changing to a state in which the control unit power is supplied to the control unit 62 (hereinafter also referred to as the first conversion state).

[0159] When the current determination unit 119 determines that the operation state of the control unit 62 is the low power operation state, the current determination unit 119 outputs the second current notification signal Sia2 to the operation state determination unit 75. As a result, the operation state determination unit 75 outputs the power-on command signal Sc1 indicating that the low power operation state is in progress to the first switch unit 67, and stops the voltage conversion of the third conversion power supply 93. At this time, the third control unit power supply 111 outputs the constant voltage Vcc using the fourth conversion power supply 95, thereby changing to a state in which the control unit power is supplied to the control unit 62 (hereinafter also referred to as the second conversion state).

[0160] [3-2. Changes in current consumption associated with switching of operating states in the control unit]

[0161] Next, use Figure 7 A description will be given of a change in the current consumption Ia in the third control unit power supply 111 accompanying the switching of the operating state in the control unit 62 .

[0162] Figure 7 , the time point when the user completes the pulling operation of the trigger operation unit 9 is set as time t0, and the switching of the operating state of the control unit 62 and the change of the consumption current Ia with the passage of time are shown.

[0163] If the user continues not pulling the trigger operation unit 9 during the period from time t0 to time t21 after the sleep determination time Ts has elapsed, the control unit 62 starts processing for changing the operation state from the control operation state to the low power operation state (operation state switching processing).

[0164] When the operation state switching process is started, the control unit 62 first executes a process of sequentially stopping the power supply to various devices and various circuits provided in the third electric working machine 23. Accompanying this, the consumption current Ia gradually decreases from the twentieth consumption current Ia20 (time t21-t22), and the current equivalent to the current consumption amount (first current change amount ΔIa21) in the various devices before the stop is reduced, and the consumption current Ia at this time is reduced to the twenty-first consumption current Ia21.

[0165] Next, as a step in the operation state switching process, the control unit 62 executes a process of switching the control unit 62 itself to a low power operation state (sleep mode) (time t22). As a result, a current equivalent to a current consumption amount (second current change amount ΔIa22) equivalent to the difference between the current consumption amount in the control operation state and the current consumption amount in the low power operation state in the control unit 62 is reduced, and the consumption current Ia at this time is reduced to the twenty-second consumption current Ia22. In addition, the second current change amount ΔIa22 is equivalent to the third current change amount ΔIa3 of the first embodiment and the third current change amount ΔIa13 of the second embodiment.

[0166] Thereafter, when the bypass current determination unit 115 determines that the operation state of the control unit 62 is in the low power operation state in conjunction with the reduction in the current consumption in the control unit 62, the operation state determination unit 75 outputs a power-on command signal Sc1 indicating that the operation state is in the low power operation state to the first switch unit 67, and stops the voltage conversion of the third conversion power supply 93. As a result, the current corresponding to the current consumption (third current change amount ΔIa23) required for the voltage conversion in the third conversion power supply 93 is reduced, and the consumption current Ia at this time is reduced to the twenty-third consumption current Ia23. In addition, the third current change amount ΔIa23 corresponds to the second current change amount ΔIa2 of the first embodiment and the second current change amount ΔIa12 of the second embodiment.

[0167] By executing these operations, the control unit 62 completes the operation state switching process and maintains the low-power operation state until the user pulls the trigger operation unit 9 .

[0168] After that, when the user pulls the trigger operation unit 9 (time t24), the trigger signal Str is input to the control unit 62. As a result, the control unit 62 itself changes (wakes up) from the low-power operation state (sleep mode) to the control operation state. Then, the awakened control unit 62 starts the operation state switching process for changing the operation state from the low-power operation state to the control operation state. In addition, the trigger signal Str from the trigger operation unit 9 is also input to the operation state determination unit 75, and the power-on instruction signal Sc1 from the operation state determination unit 75 is input to the third control unit power supply 111, thereby starting the voltage conversion of the third conversion power supply 93. Therefore, along with the awakening of the control unit 62 and the voltage conversion operation of the third conversion power supply 93, the consumption current Ia gradually increases to the twenty-first consumption current Ia21 (time t24-t25). In addition, the consumption current Ia increases by the second current change amount ΔIa22 relative to the twenty-third consumption current Ia23 through the awakening of the control unit 62, and becomes the twenty-fourth consumption current Ia24 (time t24). Thereafter, the consumption current Ia increases by the third current change amount ΔIa23 due to the voltage conversion operation of the third conversion power source 93 and becomes the twenty-first consumption current Ia21 (time t25 ).

[0169] At this time, when the bypass current determination unit 115 determines that the operation state of the control unit 62 is in the control operation state as the current consumption in the control unit 62 increases, the operation state determination unit 75 outputs a power-on instruction signal Sc1 indicating that the operation state is in the control operation state to the first switch unit 67. At this time, although the voltage conversion of the third conversion power supply 93 is being performed according to the trigger signal Str from the trigger operation unit 9, if the user ends the operation of the trigger operation unit 9, the control operation state of the control unit 62 is maintained, and the voltage conversion of the third conversion power supply 93 is continued until the sleep determination time Ts elapses.

[0170] Next, as a step in the operation state switching process, the control unit 62 executes a process of sequentially starting power supply to various devices and circuits included in the third electric working machine 23 (time t26 ). In conjunction with this, the consumption current Ia increases to the twentieth consumption current Ia20 .

[0171] In this way, when the operating state of the third electric working machine 23 in the control unit 62 is changed to the low-power operating state, the voltage conversion in the third conversion power supply 93 is stopped based on the judgment result in the bypass current judgment unit 115, thereby reducing the consumption current Ia equivalent to the third current change amount ΔIa23.

[0172] [3-3. Effect]

[0173] As described above, for the third electric working machine 23 of the third embodiment, when the control unit 62 is in the low-power operation state, the third control unit power supply 111 is changed to the second conversion state based on the determination result in the bypass current determination unit 115, and the third conversion power supply 93 is not used when the voltage conversion of the third control unit power supply 111 is performed, so that the power consumption in the third conversion power supply 93 can be suppressed. Therefore, when the operation state of the control unit 62 is changed from the control operation state to the low-power operation state when the third electric working machine 23 is not used, not only the power consumption in the control unit 62 but also the power consumption in the third conversion power supply 93 can be reduced, so the power consumption when the third electric working machine 23 is not used can be reduced.

[0174] [3-4. Correspondence of terms]

[0175] Here, the correspondence relationship between the terms is explained.

[0176] The third electric working machine 23 is equivalent to an example of an electric working machine, the control unit 62 and the motor driver 99 are equivalent to an example of a control unit, the brushless motor 97 is equivalent to an example of a drive unit, the third control unit power supply 111 is equivalent to an example of a control unit power supply, the third conversion power supply 93 is equivalent to an example of the first conversion power supply, and the fourth conversion power supply 95 is equivalent to an example of the second conversion power supply.

[0177] The action state determination unit 75 and the bypass current determination unit 115 are equivalent to an example of an action state determination unit, the third current path LC3 is equivalent to an example of a third current path, the bypass current path LC4 is equivalent to an example of a bypass current path, the common current path LC5 is equivalent to an example of a common current path, the second constant voltage Vdd is equivalent to an example of an intermediate power supply voltage, and the action reference value Ith is equivalent to an example of an action reference value.

[0178] [4. Fourth embodiment]

[0179] As a fourth embodiment, a fourth electric working machine 25 in which a part of the components of the third electric working machine 23 of the third embodiment are replaced will be described.

[0180] like Figure 8 As shown, the fourth electric working machine 25 is configured by replacing the third control unit power supply 111 and the bypass current determination unit 115 in the third electric working machine 23 with a fourth control unit power supply 121 and a second bypass current determination unit 131, respectively.

[0181] [4-1. Power supply for the fourth control unit]

[0182] The fourth control unit power supply 121 performs voltage conversion on the battery voltage VB from the battery pack 100, and outputs the constant voltage Vcc after the voltage conversion to the constant voltage supply line 81. The constant voltage Vcc is supplied to each part (control unit 62, etc.) of the fourth electric working machine 25 via the constant voltage supply line 81. In the fourth embodiment, the constant voltage Vcc is 5 V. The power supplied from the fourth control unit power supply 121 via the constant voltage supply line 81 is used as, for example, operating power for the control unit 62, etc.

[0183] The fourth control unit power supply 121 includes a third conversion power supply 93 , a first switch unit 67 , a reverse current suppressing unit 113 , a fourth conversion power supply 95 , a limiting resistor unit 123 , a third current path LC3 , a bypass current path LC4 , and a common current path LC5 .

[0184] Among them, the third conversion power supply 93, the first switch unit 67, the fourth conversion power supply 95, the third current path LC3, the bypass current path LC4, and the common current path LC5 are respectively the same structures as the third conversion power supply 93, the first switch unit 67, the fourth conversion power supply 95, the third current path LC3, the bypass current path LC4, and the common current path LC5 of the second embodiment.

[0185] The limiting resistor 123 is connected in series with the bypass current path LC4. The limiting resistor 123 is configured to include a resistor element and to prevent the bypass current Ibp flowing through the bypass current path LC4 from becoming excessively large.

[0186] The second bypass current determination unit 131 includes a hysteresis comparator 133, a resistor unit 135, a resistor unit 134, and a reference voltage unit 136. The second bypass current determination unit 131 is configured to be electrically connected to the fifth branch point P5 via the sixth path LC6, and is capable of detecting the potential of the input unit 95a of the fourth conversion power supply 95, and is capable of detecting the bypass current Ibp. The second bypass current determination unit 131 is configured to output a current notification signal Sia corresponding to the bypass current Ibp to the operation state determination unit 75.

[0187] Furthermore, as described in the third embodiment, when the first switch section 67 is in the off state and the operation state of the control section 62 is the control operation state, the power consumption in the control section 62 and the like via the constant voltage supply line 81 increases, and the bypass current Ibp increases, so the potential of the input section 95a of the fourth conversion power supply 95 decreases. In addition, when the first switch section 67 is in the off state and the operation state of the control section 62 is the low power operation state, the power consumption in the control section 62 and the like via the constant voltage supply line 81 decreases, and the bypass current Ibp decreases, so the potential of the input section 95a of the fourth conversion power supply 95 increases.

[0188] When the bypass current Ibp is greater than a predetermined action reference value Ith (e.g., 5 [mA]) and the potential of the fifth branch point P5 (the input section 95a of the fourth conversion power supply 95) is lower than the determination voltage Vth, the second bypass current determination section 131 outputs a current notification signal Sia (hereinafter, also referred to as the first current notification signal Sia1) having the same potential as the battery voltage VB. When the bypass current Ibp is less than the action reference value Ith and the potential of the fifth branch point P5 (the input section 95a of the fourth conversion power supply 95) exceeds the determination voltage Vth, the second bypass current determination section 131 outputs a current notification signal Sia (hereinafter, also referred to as the second current notification signal Sia2) having a potential lower than the battery voltage VB.

[0189] That is, the second bypass current determination unit 131 is configured to determine whether the operation state of the control unit 62 is the control operation state or the low-power operation state based on the comparison result between the bypass current Ibp and the operation reference value Ith.

[0190] In addition, the second bypass current determination unit 131 has a hysteresis comparator 133, which can set the determination voltage Vth used for output determination of the first current notification signal Sia1 (hereinafter also referred to as the first determination voltage Vth1) and the determination voltage Vth used for output determination of the second current notification signal Sia2 (hereinafter also referred to as the second determination voltage Vth2) to different values.

[0191] For example, when the output voltage of the reference voltage unit 136 is set to a judgment voltage Vth (=Vdd+ΔVa=17[V]) obtained by adding a predetermined adjustment voltage ΔVa (=2[V]) to the second constant voltage Vdd, and the hysteresis width of the hysteresis comparator 133 is set to 1[V], the first judgment voltage Vth1 becomes 16[V] and the second judgment voltage Vth2 becomes 18[V].

[0192] In this case, when the potential of the fifth branch point P5 (the input section 95a of the fourth conversion power supply 95) is lower than 16 [V], the second bypass current determination section 131 determines that the operation state of the control section 62 is the control operation state, and starts outputting the first current notification signal Sia1. Thereafter, while the potential of the fifth branch point P5 is below 18 [V], the second bypass current determination section 131 determines that the operation state of the control section 62 is the control operation state, and continues outputting the first current notification signal Sia1. Thereafter, when the potential of the fifth branch point P5 exceeds 18 [V], the second bypass current determination section 131 determines that the operation state of the control section 62 is the low power operation state, and starts outputting the second current notification signal Sia2. Thereafter, while the potential of the fifth branch point P5 is above 16 [V], the second bypass current determination section 131 determines that the operation state of the control section 62 is the low power operation state, and continues outputting the second current notification signal Sia2. Thereafter, when the potential of the fifth branch point P5 becomes lower than 16 [V], the second bypass current determination unit 131 starts outputting the first current notification signal Sia1 .

[0193] When the second bypass current determination unit 131 determines that the operation state of the control unit 62 is the control operation state, the first current notification signal Sia1 is output to the operation state determination unit 75. As a result, the operation state determination unit 75 outputs the power-on command signal Sc1 indicating that the control operation state is in progress to the first switch unit 67, and performs voltage conversion of the third conversion power supply 93. At this time, the fourth control unit power supply 121 outputs the constant voltage Vcc using the third conversion power supply 93 and the fourth conversion power supply 95, thereby changing to a state in which the control unit power is supplied to the control unit 62 (hereinafter also referred to as the first conversion state).

[0194] When the second bypass current determination unit 131 determines that the operation state of the control unit 62 is the low power operation state, the second bypass current determination unit 131 outputs the second current notification signal Sia2 to the operation state determination unit 75. As a result, the operation state determination unit 75 outputs the power-on instruction signal Sc1 indicating the low power operation state to the first switch unit 67, thereby stopping the voltage conversion of the third conversion power supply 93. At this time, the fourth control unit power supply 121 outputs the constant voltage Vcc using the fourth conversion power supply 95, thereby changing to a state of supplying control unit power to the control unit 62 (hereinafter also referred to as the second conversion state).

[0195] [4-2. Changes in current consumption associated with switching of operating states in the control unit]

[0196] Next, use Fig. 9 , a description will be given of a change in the current consumption Ia in the fourth control unit power supply 121 accompanying the switching of the operating state in the control unit 62.

[0197] Fig. 9 , the time point when the user completes the pulling operation of the trigger operation unit 9 is set as time t0, and the switching of the operating state of the control unit 62 and the change of the consumption current Ia with the passage of time are shown.

[0198] If the user continues not pulling the trigger operation unit 9 during the period from time t0 to time t31 after the sleep determination time Ts has elapsed, the control unit 62 starts processing for switching the operation state from the control operation state to the low power operation state (operation state switching processing).

[0199] When the operation state switching process is started, the control unit 62 first executes the process of sequentially stopping the power supply to various devices and various circuits provided in the fourth electric working machine 25. Accompanying this, the consumption current Ia gradually decreases from the thirtieth consumption current Ia30 (time t31-t32), and the current equivalent to the current consumption amount (first current change amount ΔIa31) in the various devices before the stop is reduced, and the consumption current Ia at this time is reduced to the thirty-first consumption current Ia31.

[0200] Next, as a step in the operation state switching process, the control unit 62 executes a process of switching the control unit 62 itself to the low power operation state (sleep mode) (time t32). As a result, a current equivalent to the current consumption amount (second current change amount ΔIa32) equivalent to the difference between the current consumption amount in the control operation state and the current consumption amount in the low power operation state in the control unit 62 is reduced, and the consumption current Ia at this time is reduced to the thirty-second consumption current Ia32.

[0201] Thereafter, when the second bypass current determination unit 131 determines that the operation state of the control unit 62 is in the low power operation state as the current consumption in the control unit 62 decreases, the operation state determination unit 75 outputs a power-on command signal Sc1 indicating that the operation state is in the low power operation state to the first switch unit 67, thereby stopping the voltage conversion of the third conversion power supply 93. As a result, the current corresponding to the current consumption (third current change ΔIa33) required for the voltage conversion in the third conversion power supply 93 is reduced, and the consumption current Ia at this time is reduced to the thirty-third consumption current Ia33.

[0202] By executing these operations, the control unit 62 completes the operation state switching process and maintains the low-power operation state until the user pulls the trigger operation unit 9 .

[0203] After that, when the user pulls the trigger operation unit 9 (time t34), the trigger signal Str is input to the control unit 62. As a result, the control unit 62 itself changes (wakes up) from the low-power operation state (sleep mode) to the control operation state. Then, the awakened control unit 62 starts the operation state switching process for changing the operation state from the low-power operation state to the control operation state. In addition, the trigger signal Str from the trigger operation unit 9 is also input to the operation state determination unit 75, and the power-on instruction signal Sc1 from the operation state determination unit 75 is input to the fourth control unit power supply 121, thereby starting the voltage conversion of the third conversion power supply 93. Therefore, along with the awakening of the control unit 62 and the voltage conversion operation of the third conversion power supply 93, the consumption current Ia gradually increases to the thirty-first consumption current Ia31 (time t34-t35). In addition, the consumption current Ia increases from the thirty-third consumption current Ia33 by the amount of the second current change amount ΔIa32 to the thirty-fourth consumption current Ia34 (time t34) through the awakening of the control unit 62. Thereafter, the consumption current Ia increases by the third current change amount ΔIa33 due to the voltage conversion operation of the third conversion power source 93 and becomes the thirty-first consumption current Ia31 (time t35 ).

[0204] At this time, when the second bypass current determination unit 131 determines that the operation state of the control unit 62 is in the control operation state as the current consumption in the control unit 62 increases, the operation state determination unit 75 outputs a power-on instruction signal Sc1 indicating that the operation state is in the control operation state to the first switch unit 67. At this time, although the voltage conversion of the third conversion power supply 93 is being performed according to the trigger signal Str from the trigger operation unit 9, if the user ends the operation of the trigger operation unit 9, the control operation state of the control unit 62 is maintained, and the voltage conversion of the third conversion power supply 93 is continued until the sleep determination time Ts elapses.

[0205] Next, as a step in the operation state switching process, the control unit 62 executes a process of sequentially starting power supply to various devices and circuits included in the fourth electric working machine 25 (time t36). In conjunction with this, the consumption current Ia increases to the thirtieth consumption current Ia30.

[0206] In this way, when the operating state of the fourth electric working machine 25 in the control unit 62 is changed to the low-power operating state, the voltage conversion in the third conversion power supply 93 is stopped based on the judgment result in the second bypass current judgment unit 131, thereby reducing the consumption current Ia equivalent to the third current change amount ΔIa33.

[0207] [4-3. Effect]

[0208] As described above, in the fourth electric working machine 25 of the fourth embodiment, when the control unit 62 is in the low power operation state, the fourth control unit power supply 121 is changed to the second conversion state based on the determination result in the second bypass current determination unit 131, and the third conversion power supply 93 is not used when the voltage conversion of the fourth control unit power supply 121 is performed, so that the power consumption in the third conversion power supply 93 can be suppressed. Therefore, when the operation state of the control unit 62 is changed from the control operation state to the low power operation state when the fourth electric working machine 25 is not used, not only the power consumption in the control unit 62 but also the power consumption in the third conversion power supply 93 can be reduced, so the power consumption when the fourth electric working machine 25 is not used can be reduced.

[0209] [4-4. Correspondence of terms]

[0210] Here, the correspondence relationship between the terms is explained.

[0211] The fourth electric working machine 25 corresponds to an example of an electric working machine, the fourth control unit power supply 121 corresponds to an example of a control unit power supply, and the operating state determination unit 75 and the second bypass current determination unit 131 correspond to an example of an operating state determination unit.

[0212] [5. Fifth embodiment]

[0213] As a fifth embodiment, a fifth electric working machine 27 in which a part of the components of the second electric working machine 21 of the second embodiment are replaced will be described.

[0214] like Fig.10 As shown, the fifth electric working machine 27 is configured by replacing the second control unit power supply 91 in the second electric working machine 21 with a fifth control unit power supply 141 and replacing the battery pack 100 with a multi-output power supply 102 .

[0215] The multi-output power supply 102 includes a plurality of battery groups (a first battery group 103 and a second battery group 104 ), a plurality of voltage output units (a first voltage output unit 102 a and a second voltage output unit 102 b ), and a reference electrode 102 c .

[0216] The first battery group 103 and the second battery group 104 are connected in series. The first battery group 103 and the second battery group 104 each include a secondary battery (not shown) that can be repeatedly charged and discharged. The output voltage of the first battery group 103 is 36 [V]. The output voltage of the second battery group 104 is 36 [V].

[0217] The first voltage output unit 102a is connected to the positive electrode of the second battery group 104. The second voltage output unit 102b is connected to the positive electrode of the first battery group 103 and the negative electrode of the second battery group 104. The reference electrode 102c is connected to the negative electrode of the first battery group 103.

[0218] The multi-output power supply 102 is configured such that, with reference electrode 102c as a reference, a plurality of voltage output units (first voltage output unit 102a, second voltage output unit 102b) respectively output different voltages. The multi-output power supply 102 outputs a first battery voltage VB1 (VB1=72[V]) from the first voltage output unit 102a, and outputs a second battery voltage VB2 (VB2=36[V]) from the second voltage output unit 102b.

[0219] The first battery group 103 outputs the first cutoff command signal Sb1 when the output voltage of the first battery group 103 is in an abnormal state such as a drop in output voltage. The second battery group 104 outputs the second cutoff command signal Sb2 when the output voltage of the second battery group 104 is in an abnormal state such as a drop in output voltage.

[0220] [5-1. Power supply for the fifth control unit]

[0221] The fifth control unit power supply 141 converts the voltage of either the first battery voltage VB1 or the second battery voltage VB2 from the multi-output power supply 102 , and outputs the converted constant voltage Vcc (Vcc=5 [V]) to the constant voltage supply line 81 .

[0222] The fifth control unit power supply 141 is configured by adding a second switch unit 143 and a third switch unit 145 to the second control unit power supply 91 and changing the connection destination of the second current path LC2. The following description will focus on the differences between the fifth control unit power supply 141 and the second control unit power supply 91.

[0223] A first end of the second current path LC2 is connected to the second voltage output portion 102b of the multi-output power supply 102. A second end of the second current path LC2 is connected to the third branch point P3 and is also connected to the constant voltage supply line 81.

[0224] The second switch section 143 and the third switch section 145 are provided between the input section 71a of the second conversion power supply 71 and the second voltage output section 102b of the multi-output power supply 102 in the second current path LC2. The second switch section 143 and the third switch section 145 are each configured to include a switch section (FET, etc.) connected in series with the second current path LC2.

[0225] The second switch section 143 is configured to be able to switch the switch section to a power-on state (on state) or a non-power-on state (off state) based on the first cutoff instruction signal Sb1 from the first battery pack 103. The third switch section 145 is configured to be able to switch the switch section to a power-on state (on state) or a non-power-on state (off state) based on the second cutoff instruction signal Sb2 from the second battery pack 104.

[0226] The second switch unit 143 and the third switch unit 145 are configured to be able to switch between an energized state and a non-energized state for energization from the second voltage output unit 102b to the second conversion power supply 71 in the second current path LC2. Therefore, the second switch unit 143 and the third switch unit 145 are configured to be able to switch the input state of the second battery voltage VB2 to the second conversion power supply 71 based on the first cutoff command signal Sb1 and the second cutoff command signal Sb2.

[0227] The third conversion power supply 93 has a DC-DC converter that converts a DC voltage and outputs it. The third conversion power supply 93 converts the first battery voltage VB1 [VB1 = 72 [V]] input to the input unit 93a, and outputs the second constant voltage Vdd after the voltage conversion from the output unit 93b. The third conversion power supply 93 outputs 15 [V] as the second constant voltage Vdd. When the third conversion power supply 93 performs voltage conversion, the maximum output current is 150 mA.

[0228] With respect to the fifth control unit power supply 141 constructed in this way, when a power-on instruction signal Sc1 indicating a control action state is input from the action state determination unit 75, the third conversion power supply 93 and the fourth conversion power supply 95 are used to output a constant voltage Vcc, and the second conversion power supply 71 is used to output a constant voltage Vcc, thereby switching to a state in which control unit power is supplied to the control unit 62 (hereinafter also referred to as a first conversion state).

[0229] In addition, when a power-on command signal Sc1 indicating a low-power action state is input from the action state determination unit 75, the fifth control unit power supply 141 stops the voltage conversion of the third conversion power supply 93 and the fourth conversion power supply 95, and uses the second conversion power supply 71 to output a constant voltage Vcc, thereby changing to a state of supplying control unit power to the control unit 62 (hereinafter also referred to as the second conversion state).

[0230] Furthermore, the fifth control unit power supply 141 sets the second switch unit 143 or the third switch unit 145 to a non-energized state based on the first cutoff command signal Sb1 from the first battery pack 103 or the second cutoff command signal Sb2 from the second battery pack 104, thereby stopping the input of the second battery voltage VB2 to the second conversion power supply 71. In other words, the fifth control unit power supply 141 is configured to stop the input of the second battery voltage VB2 to the second conversion power supply 71 when at least one of the first battery pack 103 and the second battery pack 104 becomes abnormal, thereby stopping the second conversion power supply 71 from outputting the constant voltage Vcc.

[0231] The fifth control unit power supply 141 may include a power supply holding circuit 147. The power supply holding circuit 147 is connected between the third conversion power supply 93 and the fourth conversion power supply 95 in the first current path LC1. The power supply holding circuit 147 includes a resistor 147a, a diode 147b, and a capacitor 147c.

[0232] The power supply holding circuit 147 is configured to charge the capacitor 147c via the resistor 147a when charging the capacitor 147c, and to discharge the capacitor 147c via the diode 147b when discharging the capacitor 147c. Thus, the power supply holding circuit 147 can prevent the second constant voltage Vdd from being reduced due to the rush current when the capacitor 147c starts to be charged, and can quickly discharge the capacitor 147c when discharging.

[0233] By providing the power supply holding circuit 147, the second constant voltage Vdd or the constant voltage Vcc can be maintained by the charge in the capacitor 147c of the power supply holding circuit 147 for a certain period of time after the third conversion power supply 93 stops outputting the second constant voltage Vdd, and the control unit 62 can be driven. Therefore, even if the multi-output power supply 102 is suddenly taken out or the output (power) from the multi-output power supply 102 is lost due to some abnormality, the second constant voltage Vdd or the constant voltage Vcc is maintained by the discharge of the capacitor 147c, so that the control unit 62 can appropriately perform the shutdown process. In addition, as the shutdown process, for example, a process of writing various history information and various setting states to a non-volatile memory can be cited.

[0234] [5-2. Effect]

[0235] As described above, in the fifth embodiment, when the control unit 62 is in the low-power operation state, the fifth control unit power supply 141 is changed to the second conversion state, and the third conversion power supply 93 and the fourth conversion power supply 95 are not used when the voltage conversion in the fifth control unit power supply 141 is performed, so that the power consumption of the third conversion power supply 93 and the fourth conversion power supply 95 can be suppressed. Therefore, when the operation state of the control unit 62 is changed from the control operation state to the low-power operation state when the fifth electric working machine 27 is not used, not only the power consumption in the control unit 62 can be reduced, but also the power consumption in the third conversion power supply 93 and the fourth conversion power supply 95 can be reduced, so the power consumption when the fifth electric working machine 27 is not used can be suppressed.

[0236] In addition, the fifth electric working machine 27 uses a multi-output power supply 102 having a plurality of battery packs as a power source, and can perform a larger output operation based on a larger voltage compared to a structure using a single battery pack. In addition, the multi-output power supply 102 can increase the maximum output voltage according to the number of battery packs by adopting a structure having a plurality of battery packs.

[0237] Next, in the fifth electric working machine 27, the second conversion power supply 71 is not connected to the first voltage output unit 102a having the largest output voltage among the plurality of voltage output units (the first voltage output unit 102a and the second voltage output unit 102b), but is connected to the second voltage output unit 102b having the smallest output voltage. That is, the second conversion power supply 71 is configured to convert the first battery voltage VB1 (VB1=72[V]) output from the first voltage output unit 102a into the constant voltage Vcc (Vcc=5[V]), but convert the second battery voltage VB2 (VB1=36[V]) into the constant voltage Vcc.

[0238] Thus, compared with the case where the first battery voltage VB1 is converted into the constant voltage Vcc, the second conversion power supply 71 can reduce the voltage change amount of the voltage conversion in the second conversion power supply 71. Therefore, with respect to the power loss associated with the voltage conversion in the second conversion power supply 71, the fifth electric working machine 27 can reduce the power loss associated with the voltage conversion compared with the case where the voltage change amount is large.

[0239] In addition, in the fifth electric working machine 27, the "third conversion power supply 93 and the fourth conversion power supply 95" (equivalent to an example of the first conversion power supply) are connected to the first voltage output unit 102a, and the output voltage (VB1 = 72 [V]) of the first voltage output unit 102a is greater than the output voltage (VB2 = 36 [V]) of the second voltage output unit 102b connected to the second conversion power supply 71 among the multiple voltage output units of the multi-output power supply 102. As a result, the amount of electric power that can be output from the "third conversion power supply 93 and the fourth conversion power supply 95" is greater than the amount of electric power that can be output from the second conversion power supply 71, and the "third conversion power supply 93 and the fourth conversion power supply 95" can supply sufficient electric power to the control unit 62 compared with the second conversion power supply 71.

[0240] [5-3. Correspondence of terms]

[0241] Here, the correspondence relationship between the terms is explained.

[0242] The fifth electric working machine 27 is equivalent to an example of an electric working machine, the multi-output power supply 102 is equivalent to an example of a power supply, the fifth control unit power supply 141 is equivalent to an example of a control unit power supply, and the third conversion power supply 93 and the fourth conversion power supply 95 are equivalent to an example of the first conversion power supply.

[0243] [6. Sixth embodiment]

[0244] As a sixth embodiment, a sixth electric working machine 29 will be described. The sixth electric working machine 29 is obtained by changing some of the components of the third electric working machine 23 of the third embodiment.

[0245] like Fig.11 As shown, the sixth electric working machine 29 is configured by replacing the third control unit power supply 111 in the third electric working machine 23 with a sixth control unit power supply 151 and replacing the battery pack 100 with a multi-output power supply 102 .

[0246] The multi-output power supply 102 has the same configuration as the multi-output power supply 102 of the fifth embodiment, and therefore its description is omitted here.

[0247] [6-1. Sixth control unit power supply]

[0248] The sixth control unit power supply 151 converts the voltage of either the first battery voltage VB1 or the second battery voltage VB2 from the multi-output power supply 102 , and outputs the converted constant voltage Vcc (Vcc=5 [V]) to the constant voltage supply line 81 .

[0249] The sixth control unit power supply 151 is a structure in which the fourth switch unit 153 and the fifth switch unit 155 are added to the third control unit power supply 111, and the connection destination of the bypass current path LC4 is changed. In the following description, the sixth control unit power supply 151 is mainly described with respect to the differences from the third control unit power supply 111.

[0250] A first end of the bypass current path LC4 is connected to the second voltage output portion 102b of the multi-output power supply 102. A second end of the bypass current path LC4 is connected to the fifth branch point P5 and to a first end of the common current path LC5.

[0251] The fourth switch section 153 and the fifth switch section 155 are provided between the bypass current determination section 115 and the second voltage output section 102b of the multi-output power supply 102 in the bypass current path LC4. The fourth switch section 153 and the fifth switch section 155 are configured to include a switch section (FET, etc.) connected in series with the bypass current path LC4.

[0252] The fourth switch unit 153 is configured to be able to switch the switch unit to a power-on state (on state) or a non-power-on state (off state) based on the first cutoff instruction signal Sb1 from the first battery pack 103. The fifth switch unit 155 is configured to be able to switch the switch unit to a power-on state (on state) or a non-power-on state (off state) based on the second cutoff instruction signal Sb2 from the second battery pack 104.

[0253] The fourth switch unit 153 and the fifth switch unit 155 are configured to be able to switch between an energized state and a non-energized state for the energization from the second voltage output unit 102b to the fourth conversion power supply 95 via the bypass current determination unit 115 in the bypass current path LC4. Thus, the fourth switch unit 153 and the fifth switch unit 155 are configured to be able to switch the input state of the second battery voltage VB2 to the fourth conversion power supply 95 via the bypass current determination unit 115 based on the first cutoff command signal Sb1 and the second cutoff command signal Sb2.

[0254] The third conversion power supply 93 has a DC-DC converter that converts a DC voltage and outputs it. The third conversion power supply 93 converts the first battery voltage VB1 (VB1=72 [V]) input to the input unit 93a, and outputs the second constant voltage Vdd after the voltage conversion from the output unit 93b. The third conversion power supply 93 outputs 15 [V] as the second constant voltage Vdd. When the third conversion power supply 93 performs voltage conversion, the maximum output current is 150 mA.

[0255] In the sixth control unit power supply 151 configured as above, when the first current notification signal Sia1 is output from the current determination unit 119 to the operation state determination unit 75, the operation state determination unit 75 outputs a power-on instruction signal Sc1 indicating that the control operation state is in progress to the first switch unit 67, and performs voltage conversion of the third conversion power supply 93. At this time, the sixth control unit power supply 151 converts the first battery voltage VB1 into a constant voltage Vcc using the third conversion power supply 93 and the fourth conversion power supply 95, and outputs the constant voltage Vcc, thereby changing to a state in which the control unit power is supplied to the control unit 62 (hereinafter also referred to as the first conversion state).

[0256] In addition, in the sixth control unit power supply 151, when the second current notification signal Sia2 is output from the current determination unit 119 to the operation state determination unit 75, the operation state determination unit 75 outputs a power-on command signal Sc1 indicating that it is in the low power operation state to the first switch unit 67, and stops the voltage conversion of the third conversion power supply 93. At this time, the sixth control unit power supply 151 converts the second battery voltage VB2 into a constant voltage Vcc using the fourth conversion power supply 95, and outputs the constant voltage Vcc, thereby changing to a state of supplying control unit power to the control unit 62 (hereinafter also referred to as the second conversion state).

[0257] Furthermore, the sixth control unit power supply 151 sets the fourth switch unit 153 or the fifth switch unit 155 to a non-energized state based on the first cutoff command signal Sb1 from the first battery pack 103 or the second cutoff command signal Sb2 from the second battery pack 104, thereby stopping the second battery voltage VB2 from being input to the fourth conversion power supply 95 via the bypass current path LC4. That is, when at least one of the first battery pack 103 and the second battery pack 104 becomes abnormal, the sixth control unit power supply 151 stops inputting the second battery voltage VB2 to the fourth conversion power supply 95 via the bypass current path LC4, thereby stopping the fourth conversion power supply 95 from outputting the constant voltage Vcc via the bypass current path LC4.

[0258] [6-2. Effect]

[0259] As described above, for the sixth electric working machine 29 of the sixth embodiment, when the control unit 62 is in the low-power operation state, the sixth control unit power supply 151 is changed to the second conversion state, and the third conversion power supply 93 is not used when the voltage conversion in the sixth control unit power supply 151 is performed, so that the power consumption in the third conversion power supply 93 can be suppressed. Therefore, when the operation state of the control unit 62 is changed from the control operation state to the low-power operation state when the sixth electric working machine 29 is not used, not only the power consumption in the control unit 62 can be reduced, but also the power consumption in the third conversion power supply 93 can be reduced, so the power consumption when the sixth electric working machine 29 is not used can be reduced.

[0260] Furthermore, the sixth electric working machine 29 uses the multi-output power supply 102 including a plurality of battery packs as a power source, and can operate with a larger output at a higher voltage compared to a configuration using a single battery pack.

[0261] In addition, in the sixth electric working machine 29, the fourth conversion power supply 95 is not connected to the first voltage output unit 102a having the largest output voltage among the plurality of voltage output units (the first voltage output unit 102a and the second voltage output unit 102b), but is connected to the second voltage output unit 102b having the smallest output voltage. That is, the fourth conversion power supply 95 does not convert the first battery voltage VB1 (VB1=72[V]) output from the first voltage output unit 102a into the constant voltage Vcc (Vcc=5[V]), but converts the second battery voltage VB2 (VB2=36[V]) into the constant voltage Vcc.

[0262] Thus, compared with the case where the first battery voltage VB1 is converted into the constant voltage Vcc, the fourth conversion power supply 95 can reduce the voltage change amount of the voltage conversion in the fourth conversion power supply 95. Therefore, with respect to the power loss associated with the voltage conversion in the fourth conversion power supply 95, the sixth electric working machine 29 can reduce the power loss associated with the voltage conversion compared with the case where the voltage change amount is large.

[0263] In addition, in the sixth electric working machine 29, the "third conversion power supply 93 and the fourth conversion power supply 95" (equivalent to an example of the first conversion power supply) are connected to the first voltage output unit 102a, and the output voltage (VB1 = 72 [V]) of the first voltage output unit 102a is greater than the output voltage (VB2 = 36 [V]) of the second voltage output unit 102b to which the fourth conversion power supply 95 (equivalent to an example of the second conversion power supply) is connected among the multiple voltage output units of the multi-output power supply 102. As a result, the amount of electric power that can be output from the "third conversion power supply 93 and the fourth conversion power supply 95" is greater than the amount of electric power that can be output when the fourth conversion power supply 95 is used alone, and the "third conversion power supply 93 and the fourth conversion power supply 95" can supply sufficient electric power to the control unit 62 compared to the case where the fourth conversion power supply 95 is used alone.

[0264] [6-3. Correspondence of terms]

[0265] Here, the correspondence relationship between the terms is explained.

[0266] The sixth electric working machine 29 is equivalent to an example of an electric working machine, the multi-output power supply 102 is equivalent to an example of a power supply, the sixth control unit power supply 151 is equivalent to an example of a control unit power supply, the "third conversion power supply 93 and the fourth conversion power supply 95" are equivalent to an example of a first conversion power supply, and the fourth conversion power supply 95 alone is equivalent to an example of a second conversion power supply.

[0267] [7. Other embodiments]

[0268] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement in various forms within the range which does not deviate from the summary of this invention.

[0269] (a) In the third and fourth embodiments described above, a method in which the state notification signal Smo output from the control unit 62 is not used is described, but it may be changed to a method in which the state notification signal Smo is used as in the first and second embodiments. For example, in the third electric working machine 23 of the third embodiment, it may be configured such that, in addition to the current notification signal Sia output from the bypass current determination unit 115, the state notification signal Smo (the first state notification signal Smo1, the second state notification signal Smo2) is input to the operation state determination unit 75. That is, the operation state determination unit 75 may be configured such that it is capable of receiving the first state notification signal Smo1 and the second state notification signal Smo2.

[0270] When the bypass current Ibp is greater than the action reference value Ith or the first state notification signal Smo1 is received, the action state determination unit 75 determines that the action state of the control unit 62 is the control action state. When the bypass current Ibp is less than the action reference value Ith and the second state notification signal Smo2 is received, the action state determination unit 75 determines that the action state of the control unit 62 is the low power action state.

[0271] In this electric working machine, the operating state determination unit 75 may determine the operating state of the control unit 62 based on the first state notification signal Smo1 and the second state notification signal Smo2 in addition to the comparison result between the bypass current Ibp and the operating reference value Ith.

[0272] Furthermore, the fourth electric working machine 25 of the fourth embodiment may also be configured such that, in addition to the current notification signal Sia output from the second bypass current determination unit 131 , a state notification signal Smo (first state notification signal Smo1 , second state notification signal Smo2 ) is input to the operation state determination unit 75 .

[0273] In addition, the action determination process performed by the action state determination unit 75 may be replaced by an action determination process as an internal process of the control unit 62. For example, the control unit 62 may generate a power-on command signal Sc1 using the trigger signal Str and the state notification signal Smo, and output the power-on command signal Sc1 to the first switch unit 67, thereby controlling the first switch unit 67. Alternatively, the control unit 62 may be configured to receive the current notification signal Sia, generate a power-on command signal Sc1 using the trigger signal Str and the current notification signal Sia, and output the power-on command signal Sc1 to the first switch unit 67, thereby controlling the first switch unit 67.

[0274] (b) The first reverse current suppressing unit 69 is not limited to a switch unit such as a FET, and may be any structure as long as it is a Schottky diode or the like that can suppress the inflow of reverse current and has a low voltage drop when the current flows in the forward direction. The same is true for the second reverse current suppressing unit 73.

[0275] (c) In the above embodiment, the constant voltage Vcc=5[V], the battery voltage VB=36[V], and the second constant voltage Vdd=15[V] are described, but these voltages are not limited to these values ​​and other appropriate values ​​may be adopted depending on the purpose of the electric working machine.

[0276] In addition, in the above-mentioned embodiment, the structure of the conversion power supply that only performs step-down conversion on the voltage is described, but the electric working machine of the present invention may also be a structure of the conversion power supply that performs step-up conversion on the voltage. For example, in the second embodiment, the third conversion power supply 93 is a structure that steps down the battery voltage VB to the second constant voltage Vdd, but as another method, the third conversion power supply 93 steps up the battery voltage VB (36 [V]) to the third constant voltage Vee (for example, 51 [V]), and then the fifth conversion power supply (not shown) steps down the third constant voltage Vee to the second constant voltage Vdd (15 [V]). In addition, the third constant voltage Vee is a voltage higher than the battery voltage VB, so it can be used as a power supply for a high-side FET, etc., for example. In addition, by having a conversion power supply that performs step-up conversion on the voltage, even when the battery voltage VB is lower than the second constant voltage Vdd (15 [V]) due to an abnormality in the battery pack 100, for example, the second constant voltage Vdd can be generated.

[0277] (d) The electric working machine to which the present invention can be applied is not limited to a rechargeable impact screwdriver, and may be, for example, an electric hammer, an electric hammer drill, an electric drill, an electric screwdriver, an electric wrench, an electric reciprocating saw, an electric wire saw, an electric cutter, an electric chain saw, an electric trimmer, an electric nail driver, an electric trimmer, an electric hedge trimmer, an electric lawn trimmer, an electric lawn mower, an electric cleaning machine, an electric blower, an electric grinder, an electric impact screwdriver, an electric circular saw, an electric hammer screwdriver, etc.

[0278] (e) The function of one structural element in the above-mentioned embodiment may be dispersed into a plurality of structural elements, or the functions of a plurality of structural elements may be unified into a single structural element. In addition, at least a portion of the structure of the above-mentioned embodiment may be replaced with a known structure having the same function. In addition, a portion of the structure of the above-mentioned embodiment may be omitted. In addition, at least a portion of the structure of the above-mentioned embodiment may be added or replaced with the structure of another above-mentioned embodiment. In addition, all modes included in the technical idea determined only by the terms described in the claims are embodiments of the present invention.

Claims

1. An electric working machine comprising a driving unit driven by power from a power source, The electric working machine is characterized by comprising: a control unit configured to control the driving unit; a control unit power supply that performs voltage conversion on the power supply power from the power supply and supplies the control unit power after the voltage conversion to the control unit; and The trigger operation unit outputs a trigger signal when the user pulls the trigger operation unit. The control unit is configured to be switchable to a plurality of operating states, the plurality of operating states at least including: controlling a control operation state of the driving unit and a low power operation state in which power consumption is lower than that of the control operation state, The control unit power supply includes a first conversion power supply and a second conversion power supply. The first conversion power supply is configured to supply a control-time maximum current which is a maximum current consumption in the control unit in the control operation state when performing voltage conversion on the power supply power from the power supply. The second conversion power supply is configured to supply a low-power maximum current, which is a maximum consumption current in the control unit in the low-power operation state, when performing voltage conversion on the power supply power from the power supply, and a maximum output current is smaller than the control maximum current. The electric working machine includes an operating state determination unit that determines whether the operating state of the control unit is the control operating state or the low-power operating state. Furthermore, the control unit power supply is configured to: when the operation state determination unit determines that the operation state of the control unit is the control operation state, the power supply is changed to a first conversion state in which at least the first conversion power supply is used to supply the control unit with the control unit power; when the operation state determination unit determines that the operation state of the control unit is the low-power operation state, the voltage conversion of the first conversion power supply is stopped, and the power supply is changed to a second conversion state in which at least the second conversion power supply is used to supply the control unit with the control unit power; The control unit power supply includes a first current path and a second current path. The first current path is a part of the current path from the power supply to the control unit and includes the first conversion power supply. The second current path is connected in parallel with the first current path and includes the second conversion power supply, The first conversion power supply and the second conversion power supply are respectively configured to convert the power supply voltage into the control unit power having a control unit voltage lower than the power supply voltage output by the power supply, and to supply the control unit power after the voltage conversion. The first conversion state of the control unit power supply is a state in which the control unit power is supplied to the control unit using the first conversion power supply at least via the first current path. The second conversion state of the control unit power supply is a state in which the voltage conversion of the first conversion power supply is stopped and the control unit power is supplied to the control unit using the second conversion power supply at least via the second current path. The action state determination unit is configured to receive a first state notification signal, a second state notification signal and the trigger signal, wherein the first state notification signal indicates that the action state of the control unit is the control action state, and the second state notification signal indicates that the action state of the control unit is the low-power action state, and the action state determination unit determines that the action state of the control unit is the control action state when the first state notification signal or the trigger signal is received, and determines that the action state of the control unit is the low-power action state when the second state notification signal is received and the trigger signal is not received.

2. The electric working machine according to claim 1, characterized in that: A first reverse current suppressing unit is provided, the first reverse current suppressing unit suppressing a reverse current from flowing into an output unit of the first conversion power supply.

3. The electric working machine according to claim 1, characterized in that: A second reverse current suppressing unit is provided between the second conversion power supply and the control unit in the second current path. The second reverse current suppressing unit suppresses a reverse current from flowing into an output unit of the second conversion power supply.

4. The electric working machine according to claim 1 or 3, characterized in that: An output voltage of the first conversion power supply and an output voltage of the second conversion power supply have the same voltage value.

5. The electric working machine according to claim 1, characterized in that: The power supply includes a plurality of battery packs, and the power supply includes a plurality of voltage output units that output different voltages. The first conversion power supply and the second conversion power supply each convert an output voltage of any one of the plurality of voltage output units.

6. The electric working machine according to claim 5, characterized in that: The second conversion power supply is connected to the voltage output portion having the smallest output voltage among the plurality of voltage output portions.

7. The electric working machine according to claim 5 or 6, characterized in that: The first conversion power supply is connected to the voltage output section of the plurality of voltage output sections, the output voltage of which is larger than the output voltage of the voltage output section to which the second conversion power supply is connected.

8. An electric working machine comprising a driving unit driven by power from a power source, The electric working machine is characterized by comprising: a control unit configured to control the driving unit; and a control unit power supply that performs voltage conversion on the power supply power from the power supply and supplies the control unit power after the voltage conversion to the control unit, The control unit is configured to be switchable to a plurality of operating states, the plurality of operating states at least including: controlling a control operation state of the driving unit and a low power operation state in which power consumption is lower than that of the control operation state, The control unit power supply includes a first conversion power supply and a second conversion power supply. The first conversion power supply is configured to supply a control-time maximum current which is a maximum current consumption in the control unit in the control operation state when performing voltage conversion on the power supply power from the power supply. The second conversion power supply is configured to supply a low-power maximum current, which is a maximum consumption current in the control unit in the low-power operation state, when performing voltage conversion on the power supply power from the power supply, and a maximum output current is smaller than the control maximum current. The electric working machine includes an operating state determination unit that determines whether the operating state of the control unit is the control operating state or the low-power operating state. Furthermore, the control unit power supply is configured to: when the operation state determination unit determines that the operation state of the control unit is the control operation state, the power supply is changed to a first conversion state in which at least the first conversion power supply is used to supply the control unit with the control unit power; when the operation state determination unit determines that the operation state of the control unit is the low-power operation state, the voltage conversion of the first conversion power supply is stopped, and the power supply is changed to a second conversion state in which at least the second conversion power supply is used to supply the control unit with the control unit power; The control unit power supply comprises: a third current path which is a part of a current path from the power supply to the control unit and includes the first conversion power supply; a bypass current path connected in parallel with the third current path; and a common current path, which is connected in series with the third current path and the bypass current path, and includes the second conversion power supply, The first conversion power supply is configured to convert the power supply power voltage into an intermediate power supply power having an intermediate power supply voltage, and to supply the intermediate power supply power after voltage conversion, wherein the intermediate power supply voltage is lower than the power supply voltage output by the power supply, The second conversion power supply is configured to convert the power supply power or the intermediate power supply power voltage into the control unit power of a control unit voltage, and to supply the control unit power after voltage conversion, wherein the control unit voltage is lower than the intermediate power supply voltage. The first conversion state of the control unit power supply is a state in which the control unit power is supplied to the control unit using the first conversion power supply and the second conversion power supply at least via the third current path and the common current path. The second conversion state of the control unit power supply is a state in which the voltage conversion of the first conversion power supply is stopped and the control unit power is supplied to the control unit using the second conversion power supply at least via the bypass current path and the common current path.

9. The electric working machine according to claim 8, characterized in that: The operation state determination unit is configured to determine whether the bypass current flowing in the bypass current path is greater than a predetermined operation reference value. Furthermore, the action state determination unit determines that the action state of the control unit is the control action state when the bypass current is greater than the action reference value, and determines that the action state of the control unit is the low power action state when the bypass current is less than the action reference value.

10. The electric working machine according to claim 9, characterized in that: The operation state determination unit is configured to receive a first state notification signal and a second state notification signal, wherein the first state notification signal indicates that the operation state of the control unit is the control operation state, and the second state notification signal indicates that the operation state of the control unit is the low power operation state. Furthermore, the action state determination unit determines that the action state of the control unit is the control action state when the bypass current is greater than the action reference value or when the first state notification signal is received, and determines that the action state of the control unit is the low-power action state when the bypass current is less than the action reference value and the second state notification signal is received.

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