Electrical Equipment

Abstract

To provide electric equipment that enables additional functions to operate normally even if a power source voltage becomes astable.SOLUTION: Electric equipment 1 has: a motor 3; an inverter circuit part 45 which supplies drive electric power for the motor 3; a gate driver 40 which transmits a drive signal to the inverter circuit part 45; an arithmetic part 42 which controls the gate driver 40; light-emitting diodes D1 to D3; a step-down circuit 31 which steps down and outputs the output voltage of a battery pack 7; and a boosting circuit 32 which boosts and outputs the output voltage of the step-down circuit 31. The output voltage of the step-down circuit 31 serves as a power-source voltage to the arithmetic part 42. The output voltage of the boosting circuit 32 is supplied to the light-emitting diodes D1 to D3 and the gate driver 40.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electric device such as a power tool. [Background technology]

[0002] Some electrical devices, such as power tools, have additional functions (auxiliary functions) in addition to their main functions. For example, the impact driver described in Patent Document 1 below has a main function of tightening screws using a rotary impact mechanism, and an additional function of illuminating the work area with a light. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-056664 Summary of the Invention [Problem to be solved by the invention]

[0004] In electrical equipment with both main and additional functions, the power supply voltage may become unstable depending on the operating state of the main function, causing the additional function to malfunction. If the additional function malfunctions due to an unstable power supply voltage, it will affect the usability of the main function and reduce convenience. In addition, depending on the configuration of the additional function, the wiring may become complicated and difficult to assemble.

[0005] The present inventors have recognized the following problems. Problem 1: To provide an electrical device that can operate additional functions normally even if the power supply voltage becomes unstable. ·Problem 2: To provide an electrical device that can operate its main functions normally even if the power supply voltage becomes unstable. Problem 3: To provide an electrical device that can suppress deterioration of assembly and manufacturing costs due to the addition of additional functions. Problem 4: To provide an electrical device that can operate normally even when it has an additional function that requires a voltage higher than the power supply voltage.

[0006] The present invention aims to solve at least one of the above problems 1 to 4. [Means for solving the problem]

[0007] One aspect of the present invention is an electric device. a first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, converting an output voltage of the power supply unit and supplying the converted output voltage to the first load unit; a control unit that controls the first load unit; a second load unit driven by power from the power supply unit; a drive unit connected between the power supply unit and the second load unit and configured to drive the second load unit; Equipped with The voltage conversion unit includes a first conversion unit connected to the power supply unit, and a second conversion unit connected to the first conversion unit and the first load unit. R A second conversion unit and death, The output of the second conversion unit serves as the power source for the drive unit. Characterized by . Another aspect of the present invention is an electric device. a first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, converting an output voltage of the power supply unit and supplying the converted output voltage to the first load unit; a control unit that controls the first load unit; Equipped with the voltage conversion unit includes a first conversion unit connected to the power supply unit and a second conversion unit connected to the first conversion unit and the first load unit; the first load section has a plurality of LEDs connected in series with each other, The second conversion unit outputs a voltage higher than an operating voltage of the plurality of LEDs. It is characterized by: Another aspect of the present invention is an electric device. a first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, converting an output voltage of the power supply unit and supplying the converted output voltage to the first load unit; a control unit that controls the first load unit; a housing that accommodates the voltage conversion unit and the control unit; Equipped with the voltage conversion unit includes a first conversion unit connected to the power supply unit and a second conversion unit connected to the first conversion unit and the first load unit; the power supply unit is a battery pack that is detachable from the housing, the second conversion unit boosts the output voltage of the first conversion unit to a voltage higher than a discharge-inhibition voltage of the battery pack; It is characterized by:

[0008] The present invention may be expressed as a "working machine" or "power tool", and such expressions are also valid aspects of the present invention. [Effects of the Invention]

[0009] According to the present invention, at least one of the above problems 1 to 4 can be solved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of an electric device 1 according to an embodiment of the present invention. [Figure 2] FIG. 1 is a side cross-sectional view of an electrical device 1. [Figure 3] 1A is a front view of the electric device 1. FIG. 1B is a front view of an LED board 35 of the electric device 1. FIG. [Figure 4] FIG. 1 is a circuit block diagram of electrical device 1. [Figure 5] 1 is a simplified graph showing an example of changes over time in the current flowing through the motor 3, the output voltage of the battery pack 7, and the illuminance of the light-emitting diodes D1 to D3 in the electrical device 1. [Figure 6] 10 is a simplified graph showing another example of changes over time in the current flowing through the motor 3, the output voltage of the battery pack 7, and the illuminance of the light-emitting diodes D1 to D3 in the electrical device 1. [Figure 7] FIG. 10 is a simplified graph showing an example of the change over time in the current flowing through the motor 3, the output voltage of the battery pack 7, and the illuminance of the light-emitting diodes D1 to D3 in a comparative example electrical device configured to apply the voltage of the battery pack 7 directly to the light-emitting diodes D1 to D3. [Figure 8] 10 is a simplified graph showing another example of changes over time in the current flowing through the motor 3, the output voltage of the battery pack 7, and the illuminance of the light-emitting diodes D1 to D3 in the electric device of the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0011] In the following, identical or equivalent components, members, etc. shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted where appropriate. The embodiments are illustrative and do not limit the invention. All features and combinations thereof described in the embodiments are not necessarily essential to the invention.

[0012] This embodiment relates to an electric device 1. Figures 1 and 2 define the front-rear and up-down directions of the electric device 1, which are perpendicular to each other. The front-rear direction is a direction parallel to a motor shaft 3a of the electric device 1. The electric device 1 is an electric power tool, specifically an impact driver.

[0013] The electrical device 1 has a housing 2. The housing 2 includes a body portion 2a, a handle portion 2b, and a battery attachment / detachment portion 2c.

[0014] The body 2a is a cylindrical part whose central axis is approximately parallel to the front-rear direction. The housing 2 includes a hammer case 11 made of, for example, metal, connected to the front of the body 2a. The front surface of the hammer case 11 is covered with a front cap 12, which is a protective member.

[0015] The handle portion 2b has an upper end connected to a middle portion of the body portion 2a in the front-rear direction and extends downward from the middle portion. The electrical device 1 has a trigger switch 6 and a forward / reverse switching lever 13 (forward / reverse switching button) at the upper end of the handle portion 2b. The trigger switch 6 is an operating part that allows the user to switch between driving and stopping the motor 3 (the driving state of the motor 3). The trigger switch 6 is an infinitely variable speed switch. The forward / reverse switching lever 13 is a rotation direction switching part that allows the user to switch between forward and reverse rotation of the motor 3, i.e., forward and reverse rotation of the anvil 10 described below.

[0016] The battery attachment / detachment section 2c is provided at the lower end of the handle section 2b, and allows a battery pack 7 serving as a power source to be detachably attached. The electrical device 1 operates on power from the battery pack 7. Here, as an example, the rated voltage of the battery pack 7 is set to 10.8V (3.6V cells x 3).

[0017] The electric device 1 has an operation panel 20 (switch panel) on the front upper surface of the battery attachment / detachment part 2c. A user can use the operation panel 20 to turn on / off a light switch 39 shown in Fig. 4. The electric device 1 has a control board 30 inside the battery attachment / detachment part 2c.

[0018] The electric device 1 has a motor 3 as a second load section, a reduction mechanism 4, a spindle 5, a hammer 8, a spring 9, and an anvil 10 as a tool attachment section, inside the body section 2a and the hammer case 11. The reduction mechanism 4, the spindle 5, the hammer 8, and the spring 9 constitute a rotary impact mechanism that converts the driving force (rotational force) of the motor 3 into rotary impact force and applies it to the anvil 10.

[0019] The motor 3 is an inner rotor type brushless motor. The reduction mechanism 4 reduces the rotation of the motor 3 and transmits it to the spindle 5. The spindle 5 rotates and drives the hammer 8. A spring 9 biases the hammer 8 forward. The hammer 8 rotates or rotary strikes the anvil 10. In other words, the anvil 10 is driven by the driving force of the motor 3. The anvil 10 is rotatably supported by a hammer case 11. Driving the anvil 10 by driving the motor 3 is the main function of the electrical device 1.

[0020] The electrical device 1 has a sensor / inverter board 15 inside the body 2a. The sensor / inverter board 15 is supported in a position substantially perpendicular to the motor shaft 3a in front of the main body of the motor 3 (the part of the motor 3 excluding the motor shaft 3a). The sensor / inverter board 15 is equipped with a Hall IC 43 and an inverter circuit unit 45 shown in FIG. 4.

[0021] The electrical device 1 has an LED board 35 as an illumination board around the front of the hammer case 11. The LED board 35 is supported inside the body 2a and the front cap 12 in a position approximately perpendicular to the motor shaft 3a. The LED board 35 is annular with a notched top as shown in FIG. 3(B), and surrounds the front of the hammer case 11 approximately coaxially.

[0022] The electric device 1 has, on the front surface of the LED substrate 35, light emitting diodes (LEDs) D1 to D3 as a first load section, a pair of electrode sections 36 (terminal sections), and three conductor patterns 37.

[0023] The light emitting diode D1 is located directly below the central axis of the anvil 10 (hereinafter referred to as "central axis") when viewed from the front. The light emitting diodes D1 to D3 are provided at 120 degree intervals (equidistant intervals) around the central axis. The front of the light emitting diodes D1 to D3 is covered by a lighting cover 34. The light emitting diodes D1 to D3 are lighting units that illuminate the work area. The function of illuminating the work area with the light emitting diodes D1 to D3 is an additional function of the electrical device 1.

[0024] The pair of electrode portions 36 are electrically connected to the control board 20 via wiring 38 shown in Fig. 2, and are electrically connected to a pair of output terminals of the boost circuit 32 shown in Fig. 4. The conductor pattern 37 connects the light emitting diodes D1 to D3 in series between the pair of electrode portions 36.

[0025] 4 is a circuit block diagram of the electrical device 1. Capacitor C1 is used to prevent noise and is provided between the output terminals of the battery pack 7. Resistor R is used for current detection or load detection and is provided in the path of the current flowing through the motor 3 (hereinafter referred to as "motor current").

[0026] The electric device 1 has a Hall IC 43 and an inverter circuit unit 45 on the sensor inverter board 15. The Hall IC 43 is a position sensor (magnetic sensor) for detecting the rotation position of the motor 3.

[0027] The inverter circuit unit 45 is connected between the battery pack 7 and the motor 3 to drive the motor 3. The inverter circuit unit 45 converts DC power output from the battery pack 7 into drive power for the motor 3 and supplies it to the motor 3. The inverter circuit unit 45 includes, for example, six switching elements connected in a three-phase bridge. The motor 3 is driven by power from the battery pack 7.

[0028] The electrical device 1 has a control board 30 which includes a step-down circuit 31 as a first conversion unit, a step-up circuit 32 as a second conversion unit, a gate driver 40 (control signal output circuit) as a drive circuit unit, a lighting switch 39, a lighting drive circuit 41, and a calculation unit 42.

[0029] The step-down circuit 31 and the step-up circuit 32 are connected between the battery pack 7 and the light-emitting diodes D1 to D3, and also between the battery pack 7 and the gate driver 40. The step-down circuit 31 and the step-up circuit 32 constitute a voltage conversion unit that converts the output voltage of the battery pack 7 (hereinafter referred to as "battery voltage") and supplies it to the light-emitting diodes D1 to D3 and the gate driver 40.

[0030] The step-down circuit 31 is connected to the battery pack 7 via a diode D4 for preventing backflow and a capacitor C2 for preventing noise. The battery voltage is input to the step-down circuit 31 via the diode D4 and the capacitor C2. The step-down circuit 31 is, for example, a 5V regulator, and steps down the battery voltage to, for example, 5V and outputs it. The step-down circuit 31 is connected to the power supply input terminal of the calculation unit 42. The output voltage of the step-down circuit 31 becomes the power supply voltage of the calculation unit 42.

[0031] The boost circuit 32 is connected to the step-down circuit 31 and boosts the output voltage of the step-down circuit 31 to, for example, 12 V. The boost circuit 32 may be a general step-up DC-DC converter, such as a step-up switching regulator. The boost circuit 32 includes a boost IC 33, a choke coil L, a diode D5, and a capacitor C3. The boost IC 33 is a unit that incorporates a switching element connected in parallel to the capacitor C3 and its control circuit.

[0032] While the output voltage of the boost circuit 32 is constant, the battery voltage varies depending on the output current (hereinafter "battery current") and remaining capacity (hereinafter "remaining battery power") of the battery pack 7. The battery voltage is maximum (e.g., 12 V) when the battery is fully charged and the battery current is zero, and decreases as the remaining battery power decreases and as the output current increases. For this reason, the battery voltage is, or may become, lower than the output voltage of the boost circuit 32.

[0033] The output voltage of the boost circuit 32 is higher than the discharge prohibition voltage (hereinafter referred to as "discharge prohibition voltage") of the battery pack 7. The discharge prohibition voltage is a voltage set to prevent over-discharge, and is, for example, 7.5 V (2.5 V / cell) when the motor 3 is stopped.

[0034] The boost circuit 32 is connected to the light emitting diodes D1 to D3 and supplies a boosted output voltage to the light emitting diodes D1 to D3. The boosted output voltage is higher than the total operating voltage of the series-connected light emitting diodes D1 to D3, i.e., the minimum voltage required to light the light emitting diodes D1 to D3 (hereinafter referred to as "LED on voltage"). The LED on voltage is higher than the discharge-inhibition voltage.

[0035] The boost circuit 32 is connected to the gate driver 40 and supplies the boosted output voltage as a power supply voltage to the gate driver 40. The gate driver 40 is an example of a first load section. That is, in the electric device 1, the light emitting diodes D1 to D3 and the gate driver 40 each constitute a first load section.

[0036] The gate driver 40 transmits (applies) a drive signal, for example, a PWM (Pulse Width Modulation) signal, to the control terminal (each gate) of each switching element of the inverter circuit unit 45 under the control of the calculation unit 42. The gate driver 40 includes a bootstrap circuit for driving the switching elements on the high side of the inverter circuit unit 45. The gate driver 40, together with the inverter circuit unit 45, constitutes a drive unit that drives the motor 3. The output voltage of the boost circuit 32 serves as the power source for the drive unit.

[0037] The lighting switch 39 is a switch that can be switched on and off by the user, and transmits a lighting switching signal in response to the user's operation to the calculation unit 42. The lighting drive circuit 41 controls the lighting states of the light-emitting diodes D1 to D3 under the control of the calculation unit 42.

[0038] The calculation unit 42 includes an MCU (Micro Controller Unit). The calculation unit 42 constitutes a control unit that controls the overall operation of the electrical device 1. The calculation unit 42 controls the lighting of the light emitting diodes D1 to D3 through control of the illumination drive circuit 41. The calculation unit 42 controls the driving of the motor 3 through control of the gate driver 40.

[0039] The calculation unit 42 detects the current flowing through the motor 3 (hereinafter referred to as "motor current") from the voltage between both terminals of the resistor R. The calculation unit 42 detects the load on the motor 3 from the motor current. The calculation unit 42 detects the on / off status and operation amount (pulling amount) of the trigger switch 6. The calculation unit 42 detects the rotation direction indicated by the forward / reverse switching lever 13 (hereinafter referred to as "rotation indication direction"). The calculation unit 42 detects the rotation position of the motor 3 (hereinafter referred to as "motor rotation position") and the rotation speed of the motor 3 (hereinafter referred to as "motor rotation speed") from the output signal of the Hall IC 43.

[0040] The calculation unit 42 controls the gate driver 40 and controls the driving of the motor 3 according to the motor current, the on / off and operation amount of the trigger switch 6, the rotation instruction direction, the motor rotation position, and the motor rotation speed.

[0041] Fig. 5 is a simplified graph showing an example of temporal changes in motor current, battery voltage, and illuminance of light-emitting diodes D1 to D3 (hereinafter referred to as "LED illuminance") in electrical device 1. In this graph, it is assumed that light switch 39 is on throughout. The same applies to Figs. 6 to 8 described below.

[0042] At time t1, the user turns on the trigger switch 6, starting the motor 3 and causing the motor current to rise. As the motor current rises, the battery voltage drops, and at time t2 the battery voltage falls below the LED-on voltage. Thereafter, the motor current changes depending on the task, and the battery voltage repeatedly rises above and falls below the LED-on voltage.

[0043] Specifically, the battery voltage exceeds the LED-on voltage at time t3, falls below the LED-on voltage at time t4, exceeds the LED-on voltage at time t5, falls below the LED-on voltage at time t6, and exceeds the LED-on voltage at time t7.

[0044] After that, the motor current continues to decrease, reaching zero at time t8. This causes the battery voltage to recover, but because the remaining battery power is lower than before time t1, the battery voltage remains slightly lower than before time t1. Note that the moment the motor current begins to decrease between times t6 and t7 is when the user turns off the trigger switch 6.

[0045] During this series of operations, the battery voltage fluctuates above and below the LED on voltage, but since a constant drive voltage is supplied to the light-emitting diodes D1 to D3 from the boost circuit 32, the LED illuminance is kept constant throughout.

[0046] FIG. 6 is a simplified graph showing another example of changes over time in motor current, battery voltage, and LED illuminance in the electric device 1. In FIG.

[0047] At time t11, the user turns on the trigger switch 6, starting the motor 3 and causing the motor current to rise. The motor current continues to rise until time t13, remains constant from time t13 to t14, then drops to zero from time t14 to t16.

[0048] As the motor current changes, the battery voltage also changes. Specifically, the battery voltage begins to decrease from time t11, falls below the LED on voltage at time t12, continues to decrease until time t13, remains constant from time t13 to t14, and then increases from time t14 to t16. As in the case of Figure 5, because the remaining battery power is lower than before time t11, the battery voltage at time t16 remains slightly lower than before time t11. Note that time t14 is the timing when the user turns off the trigger switch 6.

[0049] During this series of operations, the battery voltage is below the LED on voltage during the period from time t12 to t15, but since a constant drive voltage is supplied to the light-emitting diodes D1 to D3 from the boost circuit 32, the LED illuminance is kept constant throughout, including the period from time t12 to t15.

[0050] 7 is a simplified graph showing an example of the changes over time in motor current, battery voltage, and LED illuminance in a comparative electrical device in which the voltage of battery pack 7 is directly applied to light-emitting diodes D1 to D3. The changes over time in motor current and battery voltage in FIG. 7 are the same as those in FIG. 5.

[0051] In the electrical device of the comparative example, as the battery voltage decreases during the period from time t1 to t2, the LED illuminance decreases. When the battery voltage falls below the LED on voltage at time t2, the light-emitting diodes D1 to D3 turn off (the LED illuminance becomes zero). During the period from time t2 to t7, the battery voltage temporarily exceeds the LED on voltage during the period from time t3 to t4 and the period from time t5 to t6, and the light-emitting diodes D1 to D3 turn on (the LED illuminance rises slightly). As the battery voltage rises during the period from time t7 to t8, the LED illuminance increases.

[0052] Fig. 8 is a simplified graph showing another example of the changes in motor current, battery voltage, and LED illuminance over time in the electrical device of the comparative example. The changes in motor current and battery voltage over time in Fig. 8 are the same as those in Fig. 6.

[0053] In the electrical device of the comparative example, as the battery voltage decreases during the period from time t11 to t12, the LED illuminance decreases. When the battery voltage falls below the LED on voltage at time t12, the light-emitting diodes D1 to D3 turn off (the LED illuminance becomes zero). The light-emitting diodes D1 to D3 remain off until time t15. As the battery voltage increases during the period from time t15 to t16, the LED illuminance increases.

[0054] As described above, in the electrical device of the comparative example, fluctuations in battery voltage cause fluctuations in LED illuminance, resulting in flickering. Furthermore, when the battery voltage falls below the LED on voltage, the light-emitting diodes D1 to D3 turn off. The flickering and unintended turning-off of the light-emitting diodes D1 to D3 deteriorates operability. This embodiment is intended to suitably solve these problems of the comparative example.

[0055] According to this embodiment, the following effects can be achieved.

[0056] (1) The light-emitting diodes D1 to D3 are driven by the stable output voltage of the boost circuit 32, which is not affected by fluctuations in battery voltage. This ensures that the LED illuminance remains constant even if the battery voltage fluctuates due to the motor current or remaining battery charge, resulting in high workability and convenience.

[0057] (2) The boost circuit 32 can output a voltage higher than the battery voltage, so that even if a voltage higher than the battery voltage is required to operate (light up) the light-emitting diodes D1 to D3, the light-emitting diodes D1 to D3 can be operated (lighted up) normally, which is highly convenient.

[0058] (3) The boost circuit 32 receives the stable output voltage of the step-down circuit 31, which is not affected by fluctuations in battery voltage, as its input, enabling stable boost operation even when the battery voltage fluctuates due to motor current or remaining battery charge. Furthermore, an inexpensive integrated circuit (IC) with a narrow input voltage range can be used as the boost circuit 32, reducing costs.

[0059] (4) The output voltage of the step-down circuit 31, which is the power source for the calculation unit 42, is used as the input voltage for the step-up circuit 32. This eliminates the need for a separate power supply circuit to generate the input voltage for the step-up circuit 32, thereby reducing the number of components and costs.

[0060] (5) Since the light-emitting diodes D1 to D3 are connected in series with each other, the wiring 38 connecting the LED board 35 and the control board 30 can be prevented from becoming complicated compared to when the light-emitting diodes are connected in parallel, and the conductor pattern 37 on the LED board 35 can be prevented from becoming complicated, thereby reducing the difficulty of assembly and the manufacturing costs.

[0061] (6) Since the gate driver 40 is supplied with a stable output voltage from the boost circuit 32 that is not affected by fluctuations in battery voltage, the gate driver 40 can be driven stably even if the battery voltage fluctuates due to the motor current or remaining battery charge, and the drive signal for the switching element of the inverter circuit unit 45 can be stabilized.

[0062] (7) A single boost circuit 32 can ensure both the drive voltage for the light-emitting diodes D1 to D3 and the supply voltage to the gate driver 40, thereby reducing the number of components and costs.

[0063] While the present invention has been described above using the embodiments as examples, it will be understood by those skilled in the art that various modifications can be made to the components and processes of the embodiments within the scope of the claims. Modifications will be discussed below.

[0064] The rated voltage of the battery pack 7, the output voltage of the step-down circuit 31, the output voltage of the step-up circuit 32, the number of light-emitting diodes (number of series connections) as the first load section, and the like, which are given as specific numerical values ​​in the embodiments, do not in any way limit the scope of the invention and can be changed as desired to suit the required specifications.

[0065] For example, the rated voltage of the battery pack 7 may be 14.4V (four 3.6V cells) or 18V (five 3.6V cells). The output voltage of the boost circuit 32 may exceed 12V as long as it is within the range that the gate driver 40 can tolerate as an input voltage. When the gate driver 40 is a bootstrap circuit, the output voltage of the boost circuit 32 is preferably 20V or less.

[0066] The electrical device of the present invention may be a power tool other than an impact driver, or may be an electrical device other than a power tool. The power supply unit is not limited to a detachable battery pack, but may be a battery built into the electrical device body or a commercial power source. [Explanation of symbols]

[0067] 1...electrical equipment, 2...housing, 2a...body portion, 2b...handle portion, 2c...battery attachment / detachment portion, 3...motor, 3a...motor shaft, 4...reduction mechanism, 5...spindle, 6...trigger switch (operation portion), 7...battery pack, 8...hammer, 9...spring, 10...anvil (tip tool attachment portion), 11...hammer case, 12...front cap (protective member), 13...forward / reverse switching lever (rotation direction switching portion), 15...sensor / inverter board, 20...operation panel (switch panel), 30...control board, 31...step-down Circuit (first conversion unit), 32...Boost circuit (second conversion unit), 33...Boost IC, 34...Lighting cover, 35...LED board (lighting board), 36...Electrode section (terminal section), 37...Conductor pattern, 38...Wiring, 39...Lighting switch, 40...Gate driver (control signal output circuit), 41...Lighting drive circuit, 42...Calculation section (control unit), 43...Hall IC (magnetic sensor), 45...Inverter circuit section, C1 to C3...Capacitors, D1 to D3...Light-emitting diodes (light-emitting elements), D4, D5...Diodes, L...Choke coil.

Claims

1. a first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, which converts an output voltage of the power supply unit and supplies the converted output voltage to the first load unit; a control unit that controls the first load unit; a second load unit driven by power from the power supply unit; a drive unit connected between the power supply unit and the second load unit and configured to drive the second load unit; Equipped with the voltage conversion unit includes a first conversion unit connected to the power supply unit and a second conversion unit connected to the first conversion unit and the first load unit, The output of the second conversion unit serves as a power source for the drive unit. An electrical device characterized by:

2. A first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, which converts an output voltage of the power supply unit and supplies the converted output voltage to the first load unit; a control unit that controls the first load unit; Equipped with the voltage conversion unit includes a first conversion unit connected to the power supply unit and a second conversion unit connected to the first conversion unit and the first load unit, the first load section includes a plurality of LEDs connected in series with each other; The second conversion unit outputs a voltage higher than an operating voltage of the plurality of LEDs. An electrical device characterized by:

3. 3. The electrical device according to claim 1, The first conversion unit steps down the output voltage of the power supply unit and outputs the resulting voltage. An electrical device characterized by:

4. 4. The electrical device according to claim 1, The second conversion unit boosts the output voltage of the first conversion unit and outputs the boosted output voltage. Electrical equipment characterized by

5. 5. The electrical device according to claim 4, The output voltage of the power supply unit is lower than or may be lower than the output voltage of the second conversion unit. An electrical device characterized by:

6. 2. The electrical device according to claim 1, the drive unit includes an inverter circuit unit connected to the second load unit and a drive circuit unit that transmits a drive signal to the inverter circuit unit, the first load unit has the drive circuit unit; An electrical device characterized by:

7. 7. The electrical device according to claim 1, The output of the first conversion unit serves as a power source for the control unit. An electrical device characterized by:

8. 8. An electrical device according to any one of claims 1 to 7, a housing that accommodates the voltage conversion unit and the control unit, The power supply unit is a battery pack that is detachable from the housing. An electrical device characterized by:

9. 9. The electrical device according to claim 8, the second conversion unit boosts the output voltage of the first conversion unit to a voltage higher than a discharge-inhibition voltage of the battery pack; An electrical device characterized by:

10. 3. The electrical device according to claim 2, a housing that accommodates the voltage conversion unit and the control unit, the power supply unit is a battery pack that is detachable from the housing, an operating voltage of the plurality of LEDs is higher than a discharge prohibition voltage of the battery pack; An electrical device characterized by:

11. A first load unit driven by power from a power supply unit; a voltage conversion unit connected between the power supply unit and the first load unit, which converts an output voltage of the power supply unit and supplies the converted output voltage to the first load unit; a control unit that controls the first load unit; a housing that accommodates the voltage conversion unit and the control unit; Equipped with the voltage conversion unit includes a first conversion unit connected to the power supply unit and a second conversion unit connected to the first conversion unit and the first load unit, the power supply unit is a battery pack that is detachable from the housing, the second conversion unit boosts the output voltage of the first conversion unit to a voltage higher than a discharge-inhibition voltage of the battery pack; An electrical device characterized by:

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