POWER SUPPLY DEVICE AND SYSTEM WITH POWER SUPPLY DEVICE AND ELECTRICAL TOOL

Abstract

Power supply device (1, 1A, 1B) comprising the following: an accumulator (2a); an output unit connected to an input unit of an electric tool (51, 52) and supplying the electric tool (51, 52) with power from the accumulator (2a); a control unit (12) which controls the power supplied by the output unit, a first interrupting element (Q1) arranged in a current path connecting the accumulator (2a) and the output unit, and configured to interrupt the current flow through the current path; and an identification unit for identifying a type of electrical tool connected to the output unit (51, 52), wherein the first interruption element (Q1) switches depending on whether the current path is to be interrupted or not, taking into account an identification result of the identification unit, independently of any control of the control unit (12).

Description

BACKGROUND OF THE INVENTION Technical area

[0001] The present invention relates to a power supply device that supplies an electric tool with power from a battery, and to a system comprising the power supply device and the electric tool. Related state of the art

[0002] In a power supply device connected to an electric tool, the status of the electric tool must be determined in order to change the output voltage or interrupt the power supply using a disconnect element. The invention described below, according to patent literature 1, discloses a voltage converter adapter that converts a voltage supplied by a high-capacity power supply, e.g., a backpack power supply, into a voltage usable by an electric tool and outputs the converted voltage. The voltage converter adapter includes a nominal voltage identification switch that detects a nominal voltage on the electric tool side and controls the output voltage by sensing the state of the nominal voltage identification switch with a microcomputer. [Related prior art literature][Patent literature]

[0003] Patent literature 1: Published Japanese patent JP 2014-128856 A SUMMARY [Problems to be solved]

[0004] In the configuration disclosed in patent literature 1, because the rated voltage of the electrical tool is identified by the microcomputer and the output voltage is controlled, a failure of the microcomputer or similar means that an output voltage corresponding to the rated voltage cannot be achieved. Furthermore, the appropriate voltage output also implies that no voltage is output when an interruption is required.

[0005] The present invention is provided in view of this situation and aims to create a power supply device with improved reliability of the voltage output and a system comprising the power supply device and an electrical tool. [Means of solving the problems]

[0006] One aspect of the present invention is a power supply device. The power supply device comprises: a battery; an output unit connected to an electric tool and supplying the electric tool with current from the battery; a first interrupting element configured to interrupt a current path connecting the battery and the output unit; and an identification unit for identifying the type of electric tool connected to the output unit, wherein the first interrupting element switches depending on whether the current path is to be interrupted or not, taking into account an identification result of the identification unit, independently of any control by a control unit.

[0007] The identification unit may have a power supply-side communication port, the voltage of which changes depending on the type of electrical tool connected to the output unit, and the first interruption element may switch between interrupting the current path and interrupting the current path depending on the voltage of the power supply-side communication port.

[0008] The identification unit may have a power supply unit that outputs a constant voltage via the power supply from the accumulator, and the power supply-side communication port may supply power via the power supply unit, with the voltage changing depending on the type of electric tool connected to the output unit.

[0009] The power supply-side communication port can include a first power supply-side communication port that is electrically connected to the power supply unit and a second power supply-side communication port that is electrically connected to the first interrupting element, and the first interrupting element can switch between interrupting the current path and interrupting the current path according to a voltage of the second power supply-side communication port.

[0010] The power supply device may include a second interrupting element configured to interrupt a current path connecting the accumulator and the output unit, and a control unit controlling the second interrupting element, wherein the control unit can switch whether the second interrupting element should interrupt the current path or not, depending on the identification result of the identification unit.

[0011] The first interruption element can contain a first switching element, the second interruption element can contain a second switching element, and the first and second switching elements can be arranged in series in the current path.

[0012] The first switching element can be located closer to the side of the output unit than the second switching element.

[0013] The power supply device may include a sensing unit for detecting a voltage from the output unit, wherein the control unit may transmit a stop signal to the electrical tool connected to the output unit when the voltage detected by the sensing unit is equal to or higher than a specified value when the current path is interrupted by the second interrupting element.

[0014] The output unit can alternatively be connected to battery pack connection units of several electric tools with different nominal input voltages, and the first interruption element can switch between interrupting the current path and interrupting the current path according to the nominal input voltage of the electric tool connected to the output unit without dependence on the control of the control unit.

[0015] The output unit can alternatively be connected to an electric tool with a first rated voltage and to an electric tool with a second rated voltage that is lower than the first rated voltage, wherein the first interrupting element must not interrupt the current path when the rated voltage of the electric tool connected to the output unit is the first rated voltage, and the first interrupting element may interrupt the current path when the rated voltage is the second rated voltage.

[0016] The first interrupting element can be housed in an adapter that is designed separately from a housing containing the accumulator and the output unit.

[0017] Another aspect of the present invention is a system comprising a power supply device and an electric tool. The system comprises the power supply device and the electric tool, the electric tool comprising: an input unit connected to the output unit of the power supply device; a drive source driven by the power supplied to the input unit; a first tool-side communication port connected to the first power supply-side communication port of the power supply device; and a second tool-side communication port connected to the second power supply-side communication port of the power supply device, wherein the first tool-side communication port and the second tool-side communication port are electrically short-circuited together.

[0018] Furthermore, any combinations of the above-mentioned configuration components and modifications of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention. [Effect]

[0019] According to the present invention, the power supply device can be provided with improved reliability of the voltage output, and the system including the power supply device and the electrical tool can be provided. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a rear external view of a power supply device 1 according to embodiment 1 of the present invention. Fig. Figure 2 is a front exterior view of the power supply unit 1, with the backpack unit 3 omitted. Fig. Figure 3 is a frontal external view of the power supply device 1, in which a cable 4 is detachable from an adapter 10. Fig. Figure 4 is a circuit diagram in which the power supply device 1 is connected to an electric tool 51 with a nominal input voltage of 36 V. Fig. Figure 5 is a circuit diagram in which the power supply device 1 is connected to an electric tool 52 with a nominal input voltage of 18 V. Fig. Figure 6 is a circuit diagram in which a power supply device 1A according to embodiment 2 of the present invention is connected to the electric tool 51 with a nominal input voltage of 36 V. Fig. Figure 7 is a circuit diagram in which the power supply device 1A is connected to the electric tool 52 with a nominal input voltage of 18 V. Fig. Figure 8 is a circuit diagram in which a power supply device 1B according to embodiment 3 of the present invention is connected to the electric tool 51 with a nominal input voltage of 36 V. Fig. Figure 9 is a circuit diagram in which the power supply device 1B is connected to the electric tool 52 with a nominal input voltage of 18 V. DESCRIPTION OF THE EXECUTION FORMS

[0020] Preferred embodiments of the present invention are described in detail below with reference to the drawings. Furthermore, the same or equivalent components, elements, and the like shown in each drawing are designated by the same reference numerals, and repeated descriptions are omitted where necessary. Moreover, the exemplary embodiments are for illustrative purposes only and do not limit the invention, and all features or combinations of features described in the exemplary embodiments are not necessarily essential to the invention.

[0021] Design 1: as in Fig. As shown in Figure 1, a power supply device 1 of this embodiment is a backpack-style power supply device. The power supply device 1 comprises a battery pack unit (housing unit) 2 as the housing or body, a backpack unit 3, and an adapter 10. The battery pack unit 2 houses a plurality of accumulator cells. The backpack unit 3 comprises a padding unit 3a, a shoulder strap 3b, and a hip belt 3c. The user can carry the battery pack unit 2 on the backpack unit 3. A cable 4 runs from the battery pack unit 2 along the hip belt 3c. The adapter 10 is located at the front end of the cable 4. The adapter 10 has a housing with the same shape as a battery pack for a power tool and can be detachably attached to the power tool in place of the battery pack.The adapter 10 can alternatively be connected to the battery pack connection units of several power tools with different nominal input voltages. The nominal input voltage is an example of the type of power tool.

[0022] In one example of Fig. In section 2, cable 4 comprises a first cable 4a and a second cable 4b. The first cable 4a extends from the battery pack unit 2. An end section of the first cable 4a on the side opposite the battery pack unit 2 is a connector 4c. The second cable 4b extends from the adapter 10. An end section of the second cable 4b on the side opposite the adapter 10 is a connector 4d. The connector 4d is connected to the connector 4c.

[0023] An example of Fig. 3 differs from the example of Fig. 2 by the fact that the second cable 4b is detachable from the adapter 10, with the other points being the same. One end of the second cable 4b on the side of the adapter 10 is a connector 4e. The adapter 10 has a connection unit 10a to which the connector 4e can be connected. Although not shown, the first cable 4a can be detachable from the battery pack unit 2.

[0024] A switching configuration of the power supply device 1 is described with reference to Fig. As described in section 4, the battery pack unit 2 contains a plurality of battery cells 2a and a battery protection IC 2b. The number of battery cells 2a connected in series and parallel is arbitrary. The voltages of the plurality of battery cells 2a are output to a positive terminal and a negative terminal on the battery side. As an example, it is assumed here that the output voltage between the positive terminal and the negative terminal on the battery side is 36 V, i.e., the nominal output voltage of the power supply device 1 is 36 V.

[0025] Adapter 10 comprises an adapter input positive terminal, an adapter input negative terminal, an adapter output positive terminal, an adapter output negative terminal, an adapter output negative terminal, an adapter-side SB1 terminal, an adapter-side SB2 terminal, and an adapter-side LD terminal. The adapter-side positive terminal is connected to the battery-side positive terminal. The adapter-side negative terminal is connected to the battery-side negative terminal. The adapter output-side positive terminal and the adapter output-side negative terminal form an output unit of the power supply device 1. The adapter output-side positive terminal is connected to a positive terminal of a power tool 51 (tool-side positive terminal) to which the power supply device 1 is connected. The adapter output-side negative terminal is connected to a negative terminal of the power tool 51 (tool-side negative terminal).The adapter-side SB1 connection is connected to an SB1 connection of the power tool 51 (tool-side SB1 connection). The adapter-side SB2 connection is connected to an SB2 connection of the power tool 51 (tool-side SB2 connection). The adapter-side SB1 and SB2 connections are examples of a power supply-side communication connection (an adapter-side communication connection). The tool-side SB1 terminal and the tool-side SB2 terminal are examples of a tool-side communication connection (an adapter-side communication connection). The adapter-side LD connection is connected to an LD connection of the power tool 51 (tool-side LD connection).

[0026] The adapter 10 contains a regulator (a power supply circuit) 11, which serves as the power supply unit, a control unit 12, which serves as the control unit, a voltage sensing circuit 13, which serves as the sensing unit, a switching element Q1, which serves as the first interrupting element such as a FET (field-effect transistor), an IGBT (insulated gate bipolar transistor), or the like, and a switching element Q2, which serves as the second interrupting element such as a FET, an IGBT, or the like. The regulator 11 converts (reduces) a voltage from the adapter's input positive terminal into a constant voltage (here, for example, 5 V) for operating the control unit 12 and outputs the constant voltage. The control unit 12 contains a microcomputer (a microcontroller) or similar and operates according to the output voltage of the regulator 11. The control circuit 12 controls the switching on / off of the switching element Q2 by controlling the switching on / off of a switching element Q3.A voltage detection circuit 13 detects the voltage of the positive terminal on the adapter output side and transmits the voltage to the control unit 12.

[0027] Switching elements Q1 and Q2 are P-channel MOSFETs (metal oxide semiconductor). They are connected in series between the positive terminal of the adapter's input and the positive terminal of the adapter's output (a current path connecting battery cell 2a and the positive terminal of the adapter's output). Switching element Q1 is located closer to the positive terminal of the adapter's output than switching element Q2.

[0028] A drain of switching element Q1 is connected to the positive output terminal of the adapter. A gate, serving as the control terminal of switching element Q1, is connected to the adapter-side terminal SB1 via a resistor R2 and a diode D2. A source of switching element Q1 is connected to a drain of switching element Q2. One end of resistor R1 is connected to the source of switching element Q1. The other end of resistor R1 is connected to the gate of switching element Q1. One end of resistor R2 is connected to the gate of switching element Q1, and the other end of resistor R2 is connected to the anode of diode D2. A cathode of diode D2 is connected to the adapter-side terminal SB1.

[0029] A source of switching element Q2 is connected to the adapter's input positive terminal. A gate, serving as the control terminal of switching element Q2, is connected to ground via resistor R4 and switching element Q3. One end of resistor R3 is connected to the source of switching element Q2. The other end of resistor R3 is connected to the gate of switching element Q2. One end of resistor R4 is connected to the gate of switching element Q2, and the other end is connected to resistor R3. Here, switching element Q3 is an NPN transistor. A collector of switching element Q3 is connected to the other end of resistor R4. An emitter of switching element Q3 is connected to ground. A base, serving as the control terminal of switching element Q3, is connected to control unit 12.

[0030] One end of resistor R5 is connected to a power supply line. The output voltage (5 V) of regulator 11 is supplied to the power supply line. One anode of diode D1 is connected to the other end of resistor R5 and to control unit 12. One cathode of diode D1 is connected to the adapter-side terminal SB1. The adapter-side negative terminal and the adapter-output negative terminal are connected to each other and to ground. The adapter-side terminal SB2 and the adapter-side negative terminal are short-circuited together. Resistor R5, diodes D1 and D2, adapter-side terminal SB1, and adapter-side terminal SB2 form an identification unit.

[0031] The in Fig. The electric tool 51 shown in Figure 4 has a nominal input voltage of 36V. The motor 55 is a brushless motor. A circuit 56 is, for example, an inverter circuit with switching elements such as a three-phase bridge-connected FET, IGBT, or similar. In accordance with the control of a control circuit 57, the circuit 56 converts a DC output voltage from the battery cell 2a, which is input from the positive terminal on the tool side, into an AC voltage to drive the motor 55 and supplies the AC voltage to the motor 55. The control unit 57 (e.g., PWM controller) controls the circuit 56 according to the actuation of a trigger switch 58. A short-circuit bridge 59 shorts the tool-side terminal SB1 and the tool-side terminal SB2. The tool-side negative terminal is connected to ground.The short-circuit bridge 59 is arranged on the electric tool 51 with a nominal input voltage of 36 V, but not on an electric tool 52 (. Fig. 5) with a nominal input voltage of 18 V. In the embodiment, the nominal input voltage of the electric tool connected to the power supply device 1 is identified by the presence / absence of the short-circuit bridge 59 and the presence or absence of the power supply from the power supply device 1 to the electric tool is switched.

[0032] When the adapter 10 of the power supply device 1 is connected to the power tool 51, the adapter-side terminal SB1 is grounded via the shorting bridge 59 and is at earth potential. When the adapter-side terminal SB1 is detected to have reached earth potential, the control unit 12 sets the base voltage of switching element Q3 to a high level. When the base voltage reaches a high level, a current flows between the base and emitter of switching element Q3, and switching element Q3 is turned on. When switching element Q3 is turned on, a current flows through a path that includes the positive terminal on the adapter input side, resistor R3, resistor R4, switching element Q3, and ground. Due to the voltage drop across resistor R3, a voltage between the gate and source of switching element Q2 becomes negative, and switching element Q2 is turned on.

[0033] When switching element Q2 is turned on, current flows through a path that includes the positive terminal on the adapter input side, switching element Q2, resistor R1, resistor R2, diode D2, adapter-side terminal SB1, tool-side terminal SB1 (the tool-side communication terminal), shorting bridge 59, tool-side terminal SB2, adapter-side terminal SB2, and ground. The voltage drop across resistor R1 makes the voltage between the gate and source of switching element Q1 negative, and switching element Q1 is turned on. When switching element Q1 is turned on, the voltage of battery cell 2a is output to the positive terminal of the electric tool 51 via the battery-side positive terminal, the adapter-input positive terminal, switching element Q2, switching element Q1, and the adapter-output positive terminal.

[0034] The in Fig. The electrical tool 52 shown has a nominal input voltage of 18 V and does not have the short-circuit bridge 59 compared to the one in Figure 5. Fig. Figure 4 shows an electric tool 51. In the electric tool 52, a tool-side positive terminal and a tool-side SB1 terminal are short-circuited together. A tool-side negative terminal and a tool-side SB2 terminal are short-circuited together. Furthermore, the tool-side positive terminal and the tool-side SB1 terminal can be integrated together to form a single large positive terminal that bridges an adapter-output-side positive terminal and the adapter-side SB1 terminal, which are located next to each other. Similarly, the tool-side negative terminal and the tool-side SB2 terminal can be integrated together to form a single large negative terminal that bridges an adapter-output-side negative terminal and the adapter-side SB2 terminal, which are located next to each other.The other points of the electric tool 52 are the same as those of the electric tool 51, which are in . Fig. 4 are shown.

[0035] When the adapter 10 of the power supply device 1 is connected to the electric tool 52, the adapter-side terminal SB1 remains essentially open, since the switching elements Q1 and Q2 are switched off. Furthermore, since the reverse current prevention effect of the diodes D1 and D2 is present, no current flows through the resistors R1 and R2. Therefore, the voltage between the gate and source of switching element Q1 is zero, and switching element Q1 is not switched on. That is, the current path from battery cell 2a to the electric tool 52 is interrupted. Consequently, the voltage of battery cell 2a is not applied to the positive terminal of the electric tool 52. Because switching element Q1 is not switched on when the electric tool 52 is connected to the power supply device 1, the control circuit 12 does not intervene.

[0036] On the other hand, no current flows through resistor R5 because the adapter-side terminal SB1 remains essentially open, and the reverse current prevention effect of diodes D1 and D2 is ineffective. Therefore, a voltage is pulled up across resistor R5 (a terminal on the side opposite the power supply line) and held at 5 V. When the voltage across resistor R5 is 5 V, the control unit 12 sets the base voltage of switching element Q3 to a low level. Therefore, no current flows between the base and emitter of switching element Q3, and switching element Q3 is not turned on. When switching element Q3 is not turned on, no current flows through resistors R3 and R4, the voltage between the gate and source of switching element Q2 is zero, and switching element Q2 is not turned on.This means that the current path from battery cell 2a to the electric tool 52 is interrupted. Therefore, the voltage of battery cell 2a is not applied to the positive terminal of the electric tool 52.

[0037] If the voltage detected by the voltage detection circuit 13 is equal to or higher than a specified value when switching element Q3 is switched off to control switching element Q2 to switch off, the control unit 12 sends a stop signal to the adapter-side LD terminal. For example, if switching elements Q1 and Q2 do not switch on, the voltage detected by the voltage detection circuit 13 will be equal to or higher than the specified value, even if switching element Q2 is controlled to the off position. When the stop signal is received via the tool-side LD terminal, the control unit 57 of the power tool 52 stops the switching control of the circuit 56 and stops the motor 55, regardless of the state of the trip switch 58.

[0038] According to the embodiment, the following effects can be achieved. (1) Without being dependent on the control circuit 12, the switching element Q1 switches between the interruption of the current path between the adapter input-side positive terminal and the adapter output-side positive terminal according to the nominal input voltage of the electric tool connected to the power supply device 1, i.e., depending on whether the electric tool has the short-circuit bridge 59 or not. Therefore, the power supply device 1 can switch between the interruption of the current path even when the switching element Q2 is not normally switched on / off due to a fault in the control circuit 12, thus improving the reliability of the voltage output. (2) In accordance with the control of the control circuit 12, the switching element Q2 switches between the interruption of the current path between the adapter input-side positive terminal and the adapter output-side positive terminal, depending on the rated input voltage of the electric tool connected to the power supply device 1, i.e., depending on whether the electric tool has the short-circuit bridge 59 or not. By using the two switching elements Q1 and Q2 connected in series in the current path, the power supply device 1 can switch between the interruption of the current path even if one of the switching elements Q1 and Q2 should fail to switch on, and the reliability of the voltage output can be improved. (3) When the power supply device 1 is connected to the electric tool 51, whose nominal input voltage is a first nominal voltage of 36 V, the current path between the positive terminal on the adapter input side and the positive terminal on the adapter output side is not interrupted (the switching elements Q1 and Q2 are switched on), and when the power supply device 1 is connected to the electric tool 52, whose nominal input voltage is a second nominal voltage of 18 V, the current path between the positive terminal on the adapter input side and the positive terminal on the adapter output side is interrupted (the switching elements Q1 and Q2 are switched off). This prevents the application of an output voltage of 36 V from the accumulator cell 2a to the electric tool 52, which has a nominal input voltage of 18 V.This prevents damage to the control circuit 57 of the electric tool 52 or over-revving of the motor 55. (4) A current path from the positive terminal on the battery side to the power supply line side through resistors R1 and R2, diode D2, and resistor R5 is interrupted by diode D1 to prevent reverse current flow. When the electric tool 52 is connected to the power supply device 1, this prevents current from flowing from the source side of switching element Q1 to the gate side of switching element Q1 and resistor R1, thus ensuring that switching element Q1 remains reliably switched off. A current path from the power supply line to the resistor side R2 through resistor R5 and diode D1 is interrupted by diode D2 to prevent reverse current flow.When the electric tool 52 is connected to the power supply device 1, the voltage at the other end of resistor R5 (the end section on the side opposite the power supply line) can be reliably set to 5 V (the high level), and the switch-off control of the switching element Q2 achieved by the control unit 12 can be reliably executed. As described above, the power supply device 1 contains diodes D1 and D2, and thus the switching on / off of the switching element Q1 can be achieved independently of the control of the control unit 12, and the switching on / off of the switching element Q2 can be achieved dependent on the control of the control unit 12 via the common adapter-side terminal SB1. (5) The switching element Q2, controlled by the control unit 12, is located closer to the positive terminal side of the adapter input (one side further away from the power tool) than the switching element Q1. Since the switching element located closer to the side of the power tool is easier to break, damage to the switching element Q2 can be suppressed. (6) If the voltage detected by the voltage detection circuit 13 is equal to or higher than the specified value when the switching element Q2 is switched off, the control unit 12 transmits the stop signal to the adapter-side LD terminal, and thus the drive of the electric tool connected to the power supply device 1 can be stopped even if the switching elements Q1 and Q2 do not switch on. (7) The adapter 10, which is separate from the battery pack unit 2, has a configuration related to interrupting the current path from the battery cell 2a to the power tool, such as the control circuit 12, the switching elements Q1 and Q2, and similar components. Therefore, if the configuration is damaged or broken, only the adapter 10 needs to be replaced, thus minimizing replacement costs.

[0039] Design 2: Fig. Figure 6 is a circuit diagram in which a power supply device 1A according to embodiment 2 of the present invention is connected to the electric tool 51 with a nominal input voltage of 36 V. Fig. 6 are the configurations of the battery pack unit 2 and the electric tool 51 with the configurations of the battery pack unit 2 and the electric tool 51 in Fig. 4 are identical. In contrast, the configuration of a 10A adapter differs in Fig. 6 partially from that of the adapter 10 in Fig. 4. The following description focuses on the differences.

[0040] The 10A adapter does not include resistor R5 and diodes D1 and D2, which are included in the 10 adapter. Fig. 4 are included. In contrast, the 10A adapter contains a diode D3 and a switching element Q4, which are not included in the 10A adapter. Fig. The circuit consists of four components. One anode of diode D3 is connected to a power supply line. One cathode of diode D3 is connected to the adapter-side terminal SB1. The switching element Q4 is an NPN transistor. One collector of switching element Q4 is connected to the other end of resistor R2. One emitter of switching element Q4 is connected to ground. One base, which serves as the control terminal of switching element Q4, is connected to the adapter-side terminal SB2. The adapter-side terminal SB2 is connected to control unit 12. The adapter-side terminal SB2 and the adapter output-side negative terminal are not connected to each other. The switching element Q4, diode D3, adapter-side terminal SB1, and adapter-side terminal SB2 form an identification unit.

[0041] When the 10A adapter of the 1A power supply unit is connected to the electric tool 51, a voltage from the power supply line is fed into the control circuit 12 and the base of the switching element Q4 via diode D3, adapter-side terminal SB1, tool-side terminal SB1, short-circuit bridge 59, tool-side terminal SB2, and adapter-side terminal SB2. When it is detected that a voltage at adapter-side terminal SB2 reaches a high level (a voltage from the power supply line), the control unit 12 sets a base voltage of the switching element Q3 to a high level. Then, as in the case of Fig. 4, the switching element Q3 is switched on and the switching element Q2 is switched on.

[0042] Since, on the other hand, the voltage from the power supply line is applied to the base of switching element Q4, a current flows between the base and the emitter of switching element Q4, and switching element Q4 is switched on. Thus, when switching element Q2 is switched on as described above, the current flows through a path that includes the positive terminal on the adapter input side, switching element Q2, resistor R1, resistor R2, switching element Q4, and ground. Due to the voltage drop across resistor R1, the voltage between the gate and the source of switching element Q1 becomes negative, and switching element Q1 is switched on. When switching element Q1 is switched on, the voltage of battery cell 2a is output to the positive terminal of the power tool 51 via the battery-side positive terminal, the adapter-input-side positive terminal, switching element Q2, switching element Q1, and the adapter-output-side positive terminal.

[0043] Fig. Figure 7 is a circuit diagram in which the power supply device 1A is connected to the electric tool 52 with a nominal input voltage of 18 V. Fig. 7, the configuration of the electric tool 52 is the same as that of the one in Fig. The electric tool 52 shown in Figure 5. When the 10A adapter of the 1A power supply device is connected to the electric tool 52, the adapter-side terminal SB2 is grounded via the tool-side terminal SB2, the tool-side negative terminal, and the adapter output-side negative terminal, and is at earth potential. This causes the voltage between the base and emitter of switching element Q4 to become zero, no current flows between the base and emitter, and switching element Q4 is therefore not switched on. Since switching element Q4 is off, no current flows through resistors R1 and R2, the voltage between the gate and source of switching element Q1 becomes zero, and switching element Q1 is not switched on. That is, the current path from battery cell 2a to the electric tool 52 is interrupted. Therefore, the voltage of battery cell 2a is not applied to the positive terminal of the electric tool 52.Regarding the fact that the switching element Q1 is not switched on when the electrical tool 52 is connected to the power supply device 1A, the control of the control circuit 12 does not intervene.

[0044] On the other hand, the control unit 12 sets the base voltage of switching element Q3 to a low level when the voltage of the adapter-side terminal SB2 is at ground potential. Thus, no current flows between the base and emitter of switching element Q3, and switching element Q3 is not switched on. When switching element Q3 is not switched on, no current flows through resistors R3 and R4, the voltage between the gate and source of switching element Q2 is zero, and switching element Q2 is not switched on. That is, the current path from battery cell 2a to the power tool 52 is interrupted. Therefore, the voltage of battery cell 2a is not applied to the positive terminal of the power tool 52.

[0045] This embodiment can also achieve effects similar to those described in (1)-(3) and (5)-(7) of embodiment 1. Furthermore, according to this embodiment, the diode D3 prevents current from flowing from the accumulator cell 2a into the power supply line when the electric tool 52 is connected to the power supply device 1A. Since the voltage at the adapter-side terminal SB2 is used both for detecting the nominal voltage reached by the control unit 12 and for switching the switching element Q1 on / off by switching the switching element Q4 on / off, the switching element Q1 can be switched on / off independently of the control unit 12, and the switching element Q2 can be switched on / off depending on the control unit 12, via the common adapter-side terminal SB2.

[0046] Design 3: Fig. Figure 8 is a circuit diagram in which a power supply device 1B according to embodiment 3 of the present invention is connected to the electric tool 51 with a nominal input voltage of 36 V. Fig. Figure 9 is a circuit diagram in which the power supply device 1B is connected to the electric tool 52 with a nominal input voltage of 18 V. Compared to the one in Fig. 6 and Fig. Power supply device 1A, as shown in Figure 7, differs from power supply device 1B in that the battery pack unit 2 and the adapter 10A, which are separate in power supply device 1A, are integrated as a battery pack, and all other aspects are the same. According to this embodiment, the same effects as in embodiment 2 can be achieved, with the exception of the effects in embodiment 2 that are achieved by separating the battery pack unit 2 and the adapter 10A.

[0047] In the above explanations, the present invention is described using the embodiments as examples, but it is obvious to the person skilled in the art that various modifications can be made to each component or each processing method of the embodiments within the scope of the claims. [List of reference symbols] 1, 1A, 1B Power supply device 2 Battery pack unit (housing unit) 2a Accumulator cell 3 Backpack Unit 3a Upholstery unit 3b Shoulder strap 3c hip belt 4 cables 4a first cable 4b second cable 4c-4e connector 10 adapters 10a Connection unit 11 controllers (power supply unit) 12 Control circuit (control unit) 13 Voltage detection circuit (detection unit) 51, 52 electric tool 55 engine 56 Circuit (inverter circuit) 57 Control circuit (control unit) 59 Short-circuit bridge

Claims

[1] Power supply device (1, 1A, 1B) comprising: an accumulator (2a); an output unit connected to an input unit of an electric tool (51, 52) and supplying the electric tool (51, 52) with power from the accumulator (2a); a control unit (12) which controls the power supplied by the output unit, a first interrupting element (Q1) arranged in a current path connecting the accumulator (2a) and the output unit, and configured to interrupt the current flow through the current path; and an identification unit for identifying a type of electrical tool connected to the output unit (51, 52), wherein the first interruption element (Q1) switches depending on whether the current path is to be interrupted or not, taking into account an identification result of the identification unit, independently of any control of the control unit (12). [2] Power supply device (1, 1A, 1B) according to claim 1, wherein the identification unit has a power supply-side communication port, the voltage of which changes depending on the type of electrical tool (51, 52) connected to the output unit, and the first interruption element (Q1) switches depending on whether the current path is to be interrupted or not, taking into account the voltage of the power supply-side communication port. [3] Power supply device (1, 1A, 1B) according to claim 2, wherein the identification unit has a power supply unit (11) which outputs a constant voltage by means of a power supply through the accumulator (2a), and The power supply-side communication connection is designed to provide power via the power supply unit (11), the voltage changing depending on the type of electrical tool (51, 52) connected to it. [4] Power supply device (1, 1A, 1B) according to claim 3, wherein the power supply-side communication connection comprises a first power supply-side communication connection which is electrically connected to the power supply unit (11) and a second power supply-side communication connection which is electrically connected to the first interrupting element (Q1), and The first interruption element (Q1) switches depending on whether the current path is to be interrupted or not, taking into account the voltage of the second power supply-side communication port. [5] Power supply device (1, 1A, 1B) according to any one of claims 1 to 4, comprising: a second interrupting element (Q2) configured to interrupt a current path connecting the accumulator (2a) and the output unit; and a control unit (12) that controls the second interrupt element (Q2), wherein the control unit (12) switches depending on whether the current path is to be interrupted by the second interrupting element (Q2) or not, taking into account the identification result of the identification unit. [6] Power supply device (1, 1A, 1B) according to claim 5, wherein the first interruption element (Q1) comprises a first switching element (Q1), the second interruption element (Q2) comprises a second switching element (Q2), and the first switching element (Q1) and the second switching element (Q2) are arranged in series in the current path. [7] Power supply device (1, 1A, 1B) according to claim 6, wherein the first switching element (Q1) is arranged closer to the side of the output unit than the second switching element (Q2). [8] Power supply device (1, 1A, 1B) according to one of claims 5 to 7, comprising a detection unit (13) for detecting a voltage of the output unit, wherein the control unit (12) transmits a stop signal to the electrical tool (51, 52) connected to the output unit when the voltage detected by the detection unit (13) is equal to or higher than a predetermined value when the current path is interrupted by the second interrupting element (Q2). [9] Power supply device (1, 1A, 1B) according to any one of claims 1 to 8, wherein the output unit is configured to be alternatively connected to battery pack connection units of a plurality of electric tools (51, 52) with different nominal input voltages, and the first interrupting element (Q1) switches depending on whether the current path is to be interrupted or not, taking into account the nominal input voltage of the electric tool (51, 52) connected to the output unit, independently of any control of the control unit (12). [10] Power supply device (1, 1A, 1B) according to claim 9, wherein the output unit is configured to be connected alternatively to an electric tool (51, 52) with a first rated voltage and to an electric tool (51, 52) with a second rated voltage which is lower than the first rated voltage, and the first interrupting element (Q1) does not interrupt the current path when the rated voltage of the electric tool (51, 52) connected to the output unit is the first rated voltage, and the first interrupting element (Q1) interrupts the current path when the rated voltage is the second rated voltage. [11] Power supply device (1, 1A, 1B) according to any one of claims 1 to 10, wherein the first interrupting element (Q1) is housed in an adapter (10) which is separate from a housing (2) which encloses the accumulator (2a) and has the output unit. [12] System comprising a power supply device and an electric tool, comprising the power supply device (1, 1A, 1B) according to claim 4, wherein the electric tool (51, 52) comprises: an input unit connected to the output unit of the power supply device (1, 1A, 1B); a drive source that is powered by the power supplied to the input unit; a first tool-side communication port connected to the first power supply-side communication port of the power supply device (1, 1A, 1B); and a second tool-side communication port connected to the second power supply-side communication port of the power supply device (1, 1A, 1B), wherein The first tool-side communication port and the second tool-side communication port are electrically short-circuited.

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