RU2789859C2 - Electric working machine and a method for supplying power to the controller of an electric working machine - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to an electric working machine. An electric working machine in one aspect of the present invention includes a drive device, a controller, a control power source and a means of determining the operating state. The control power supply includes the first converter and the second converter. The control power supply enters the first conversion state when the means of determining the operating state determines that the controller is in the control operating state. The control power supply in the first conversion state supplies the first control current to the controller. The control power supply enters the second conversion state when the operating state detection tool determines that the controller is in a low-power operating state. The control power supply in the second conversion state (i) stops the operation of the first converter and (ii) supplies the second control current to the controller.

EFFECT: reducing energy consumption in an electric working machine in the standby mode.

14 cl, 12 dwg

Description

BACKGROUND OF THE INVENTION

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

[0002] Japanese Unexamined Patent Application Publication No. 2006-341325 discloses an electric work machine provided with a driving device that is driven by supplying power from a battery (ie, a power source). The electric working machine includes a controller that controls a driving device and a control power supply that supplies power to the controller based on battery power. Examples of the driving device include a motor, a heater, and so on. The electric work machine interrupts the power supply from the control power supply in order to prevent excessive battery discharge when the electric work machine is not in use. This allows the electrical work machine to reduce the power consumption in the controller or control power supply to zero (0).

[0003] In the event that power supply from the control power supply is interrupted, the following events may occur: (1) communication between the electrical work machine and external devices becomes unavailable while the power supply is interrupted, and (2) there is a time lag between by re-manipulating the trigger of the electric machine and restarting the motor of the electric working machine, so that the use experience is degraded.

[0004] In contrast, it is possible to put the controller into a low power operating state (so-called sleep mode), instead of interrupting the power supply from the control power supply while the electric machine is not in use. For example, it is possible to use a controller configured such that its operating state transitions to a control operating state or a low power operating state. In the control operating state, the driving device is controlled when the user manipulates the electric operating machine. In the low power operating state, the power consumption of the controller is reduced. In other words, this controller is configured to enter a low-power operating state in order to prevent the battery from being over-discharged.

SUMMARY OF THE INVENTION

[0005] In the above electrical operating machine, although the power consumption in the controller can be reduced by changing the controller's operating state to a low-power operating state, there is a possibility that the power consumption in the control power supply cannot be reduced because the control power supply performs a power conversion operation.

[0006] For example, in the case where the linear regulator is used as a control power supply, when the output voltage (power supply voltage) of the battery is increased, the loss Ls (=(Vin-Vout) N Io) in the linear regulator increases. Vin is the input voltage (in other words, the battery output voltage) to the linear regulator, Vout is the output voltage from the regulator, and Io is the output current of the linear regulator. In other words, during normal operation, when the power supply voltage increases, power consumption occurs due to losses Ls in the control power supply.

[0007] In order to prevent an increase in power consumption due to an increase in the power supply voltage, a switching regulator such as a DC-DC converter can be used as a control power supply. However, a switching regulator as such usually draws a lot of operating current. Thus, even if the controller enters sleep mode, it is difficult to reduce the overall power consumption due to the large operating current of the switching regulator.

[0008] In other words, even if the controller enters sleep mode while the electric operating machine is not in use, and the power consumption in the controller can be reduced, power is consumed in the control power supply so that the power supply of the battery (power supply) is reduced.

[0009] In one aspect of the present invention, it is desirable that power consumption in an electric work machine can be reduced when the electric work machine is not in use.

[0010] An electric operating machine in one aspect of the present invention includes a driving device, a controller, an operating state determination means, a control power supply, and/or an operating state determination means.

The drive device is driven by power supply from the power source.

The controller switches the operating state of the controller to one of several operating states. Several operating states include a control operating state and a low power operating state. The controller in the control operating state controls the drive unit. The controller in the low power operating state consumes less power than the controller in the control operating state.

The operating state determiner determines the operating state of the controller.

[0011] The control power supply includes a first converter and a second converter. The first converter outputs the first control current based on the power supply. The first control current has a maximum value corresponding to the maximum current drawn by the controller in the control operating state.

The second converter outputs the second control current based on the power supply. The second drive current has a maximum value (i) less than the maximum value of the first drive current and (ii) corresponding to the maximum current draw of the controller in the low power operating state.

[0012] In addition, the control power supply changes to the first conversion state in response to the operating state determination means determining that the controller is in the control operating state. The control power supply in the first conversion state supplies the first control current to the controller. The control power supply changes to the second conversion state in response to the operating state determining means determining that the controller is in a low power operating state. The control power supply in the second conversion state (i) stops the operation of the first converter and (ii) supplies the second control current to the controller.

[0013] The electric operating machine can prevent power consumption in the first converter to stop the operation of the first converter when the controller is in a low power running state. Therefore, in the case where the operation state of the controller changes from the control operation state to the low power operation state when the electric operation machine is not used, the electric operation machine can reduce not only the power consumption in the controller but also the power consumption in the first converter. This allows the electric work machine to reduce power consumption when the electric work machine is not in use.

[0014] The control power supply may transition to the first conversion state in response to the user operating the electrical work machine.

In other words, in the case where the user operates the electric work machine while the control power supply is in the second conversion state, the control power supply changes from the second conversion state to the first conversion state. As a result, the first control current is supplied to the controller by at least the first converter. This allows the controller to accept the supply of the first control current required in the control operating state and control the driving device. Exemplary manipulation of the electrical work machine by the user includes manipulation of the trigger switch by the user, and so on.

[0015] The first converter may include a first output means. The electrical work machine may include a first backflow suppression means. The first reverse flow suppression means suppresses the inflow of reverse current into the first output means. The electrical operating machine may prevent the second control current from flowing into the first output means. The first reverse flow suppression means may include a switching element such as a diode or FET (Field Effect Transistor) connected in series with the first output means.

[0016] The control power supply may include a first current path and a second current path. The first current path may be part of the current path from the power supply to the controller. The first converter may be provided in the first current path. The second current path may be connected in parallel with the first current path. A second converter may be provided in the second current path.

[0017] The control power supply in the first conversion state may supply the first control current to the controller through the first current path. The control power supply in the second conversion state may supply the second control current to the controller via the second current path.

[0018] The electric operating machine can reduce the power consumption in the first converter when the controller is in the low power running state because the control power supply enters the second conversion state and stops power supply using the first converter. Thus, in a case where the controller changes from the control running state to the low power running state when the electric operating machine is not used, the electric operating machine can reduce not only the power consumption in the controller but also the power consumption in the first converter. As a result, the electric work machine can reduce power consumption when the electric work machine is not in use.

[0019] The second converter may include a second output means. The electric work machine may include a second backflow suppression means. A second backflow suppression means may be provided in the second current path between the second converter and the controller. The second reverse flow suppression means may prevent a reverse current from flowing into the second output means.

[0020] The electrical operating machine as such can prevent the first drive current from flowing to the second output means as a reverse current. The second reverse flow suppression means may include a switching element such as a diode or FET connected in series with the second converter.

[0021] The power supply may output the power supply voltage. The first converter may output the first control voltage based on the power supply voltage. The first control voltage may be lower than the power supply voltage. The second converter may output the second control voltage based on the power supply voltage. The first control voltage may be approximately equal to the second control voltage. The electrical work machine can keep the applied voltage to the controller constant regardless of whether the first converter or the second converter is used. Thus, the electrical operating machine can prevent a malfunction due to fluctuation of the applied voltage at the time of switching between the first converter and the second converter.

[0022] The operating state determination means may receive the first status notification signal and the second status notification signal. The operating state determining means may determine that the operating state of the controller is the control operating state in response to receiving the first status notification signal. The operating state determining means may determine that the operating state of the controller is a low power operating state in response to receiving the second status notification signal. The first status notification signal indicates that the operating state of the controller is the control operating state. The second status notification signal indicates that the operating state of the controller is a low power operating state. In the electric operating machine, the operating state determining means may determine the operating state of the controller based on the first status notification signal and the second status notification signal.

[0023] The control power supply may include a third current path, a shunt current path, and a common current path. The third current path may be part of the current path from the power supply to the controller. The first converter may be provided in the third current path. The shunt current path may be connected in parallel with the third current path. With the common current path, the first end may be connected to the third current path and the shunt current path. A second converter may be provided in the common current path.

[0024] The power supply may output the power supply voltage.

The first converter can convert the power supply voltage into a first control voltage. The first control voltage may be lower than the power supply voltage.

[0025] The second converter can convert the power supply voltage or the first control voltage to the second control voltage. The second control voltage may be lower than the first control voltage.

[0026] The control power supply in the first conversion state may operate the first converter and the second converter such that the second converter converts the first control voltage to the second control voltage. The control power supply in the first conversion state may supply a second control voltage to the controller. The control power supply in the second conversion state may operate the second converter such that the second converter converts the power supply voltage into a second control voltage.

[0027] The electric operating machine can prevent power consumption in the first converter when the controller is in a low power running state, since the control power supply enters the second conversion state and stops the operation of the first converter. Because of this, in a case where the controller changes from the control running state to the low power running state when the electric operating machine is not used, the electric operating machine can reduce not only the power consumption in the controller but also the power consumption in the first converter. This allows the electric work machine to reduce power consumption when the electric work machine is not in use.

[0028] The shunt current path may receive shunt current. The operating state determination means may determine whether the value of the shunt current flowing through the shunt current path is greater than a predetermined operating reference value. In addition, the operating state determination means may determine that the controller is in a control operating state in response to the shunt current value being greater than the operating reference value. In addition, the operating state determination means may determine that the controller is in a low power operating state in response to the shunt current value being equal to or less than the operating reference value. The operating state determining means may determine the operating state of the controller based on a comparison result between the shunt current and the operating reference.

[0029] The operating state determination means may receive the first status notification signal and the second status notification signal. The operating state determination means may determine that the controller is in a control operating state in response to the shunt current value being greater than the operating reference value, or in response to receiving the first status notification signal. The operating state determination means may determine that the controller is in a low power operating state (i) in response to the shunt current being equal to or below the operating reference and (ii) in response to receiving the second status notification signal. The first status notification signal indicates that the operating state of the controller is the control operating state. The second status notification signal indicates that the operating state of the controller is a low power operating state. The operating state determining means may determine the operating state of the controller based on the first status notification signal and the second status notification signal, in addition to a comparison result between the shunt current and the operating reference.

[0030] The power supply may include a first voltage output means and a second voltage output means. The first converter may be connected to the first voltage output means. The second converter may be connected to the second voltage output means.

[0031] In other words, the power supply can change the maximum output voltage by using different configurations for the output voltage of the first voltage output means and the output voltage of the second voltage output means. This allows the electric working machine to operate with increased power output based on the increased power supply voltage.

[0032] The electric operating machine as such stops the operation of the first converter when the controller is in a low power operating state. Thus, the electric work machine can prevent power consumption in the first converter and can reduce power consumption when the electric work machine is not in use.

[0033] The first voltage output means may output the first output voltage. The second voltage output means may output a second output voltage. The first output voltage may be higher than the second output voltage. As a result, the electrical energy that can be output from the first converter is larger than the electrical energy that can be output from the second converter. Thus, the first converter, compared to the second converter, can supply sufficient power to the controller. This can reduce the voltage change for voltage conversion in the second converter and reduce the power loss due to voltage conversion compared to the case of large voltage change.

[0034] The power supply may further include a third voltage output means. The third voltage output means may output a third output voltage. The second output voltage may be lower than the third output voltage. In other words, the second voltage output means outputs a voltage that is lower than those of the first voltage output means and the third voltage output means. This can reduce the voltage change for voltage conversion in the second converter, and reduce power loss due to power conversion compared to the case of a large voltage change.

[0035] Another aspect of the present invention provides a method for supplying power to a controller in an electric machine. The method includes the steps of: supplying a first drive current from the first converter to the controller in response to the controller being in a control operating state, and/or applying a second drive current from the second converter to the controller in response to the controller being is in working condition with low power consumption. The first converter is configured to output the first control current based on the power supply of the electric working machine. The first control current has a maximum value corresponding to the maximum current drawn by the controller in the control operating state. The second converter is configured to output the second control current based on the power supply. The second drive current has a maximum value (i) less than the maximum value of the first drive current and (ii) corresponding to the maximum current draw of the controller in the low power operating state.

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view of embodiments of an electric working machine;

Fig. 2 is a block diagram showing the electrical configuration of the electric working machine in the first embodiment;

Fig. 3 is a timing chart showing the relationship between the switching of the operating state of the controller and the current consumption in the control power supply, in the first embodiment;

Fig. 4 is a block diagram showing the electrical configuration of the electric working machine in the second embodiment;

Fig. 5 is a timing chart showing the relationship between the switching of the operating state of the controller and the current consumption in the second control power supply, in the second embodiment;

Fig. 6 is a block diagram showing the electrical configuration of the electric working machine in the third embodiment;

Fig. 7 is a timing chart showing the relationship between the switching of the operating state of the controller and the current consumption in the third control power supply, in the third embodiment;

Fig. 8 is a block diagram showing the electrical configuration of the electric working machine in the fourth embodiment;

Fig. 9 is a timing chart showing the relationship between the switching of the operating state of the controller and the current consumption in the fourth control power supply, in the fourth embodiment;

Fig. 10 is a block diagram showing the electrical configuration of the electric working machine in the fifth embodiment;

Fig. 11 is a block diagram showing the electrical configuration of the electric working machine in the sixth embodiment; And

Fig. 12 is a block diagram showing an electrical configuration of a multiple output power supply including three voltage output means.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0037] [1. First Implementation]

[1-1. General configuration]

As shown in FIG. 1, the electric working machine 1 is in the form of a rechargeable impact screwdriver, for example. The rechargeable impact screwdriver is powered by power supplied from the battery pack 100 described later. The rechargeable impact screwdriver is used to rotate fastener such as screw, bolt and the like. The rechargeable impact screwdriver is configured to strike in the direction of rotation according to the load during rotation of the fastener, thereby generating a large moment in the direction of rotation.

[0038] As shown in FIG. 1, the electric work machine 1 of the present embodiment includes a main body 2 and a battery pack 100. The battery pack 100 is configured to be attached to and detached from the main body 2.

The main body 2 includes a body 3. The body 3 includes two half bodies 3a, 3b, which are divided into right and left. These half-shells 3a, 3b are combined to form a shell 3. The shell 3 may be, for example, an injection molded part that includes a polymer.

[0039] The main body 2 includes a first compartment 5, a handle 6, and a second compartment 7. The first compartment 5 is provided with a chuck 8, an LED 10, and a rotation direction switching arm 11. The LED 10 emits light outside the electric working machine 1. The handle 6 protrudes from the first compartment 5. The second compartment 7 protrudes from the handle 6. The second compartment 7 is provided with a battery socket 7a to which and from which the battery pack 100 is attached and detached.

[0040] The battery pack 100 includes a rechargeable battery (not shown) that can be repeatedly charged and discharged. The rechargeable battery, for example, may be a lithium ion battery or may be another type of rechargeable battery other than a lithium ion battery. The battery pack 100 has an output voltage VB (hereinafter battery voltage VB) of 36V.

[0041] The handle 6 is held by the user of the electric work machine 1 when the user uses the electric work machine 1. The handle 6 is provided with the trigger arm 9. The user, while holding the handle 6, can perform a pull operation of the trigger arm 9 (trigger ON manipulation) with a finger.

[0042] [1-2. Electrical configuration of the electrical working machine]

Fig. 2 shows the electrical configuration of the electric working machine 1 with the battery pack 100 attached to the main body 2.

[0043] As shown in FIG. 2, the electric work machine 1 includes a motor 61, a controller 62, a motor driver 63, a control power supply 64, and an operating state determination means 75. The electrical work machine 1 includes a motor conductive path LM, a voltage conversion path LC, a first current path LC1, and a second current path LC2.

[0044] The motor conductive path LM is the current path from the positive electrode of the battery pack 100 to the negative electrode of the battery pack 100 through the motor 61 and the motor driver 63. The first end of the voltage conversion path LC is connected to the first node P1 of the motor conductive path LM, and the second end of the voltage conversion path LC is connected to the control power supply 64 (more on the second node P2). The first current path LC1 and the second current path LC2 are provided in the control power supply 64 .

[0045] Motor 61 is a brushed motor. The motor 61 is driven by current conduction using power supplied from the battery pack 100 through the motor conductive path LM.

The motor driver 63 is provided with a switch (such as a FET) connected in series with the motor conductive path LM. The motor driver 63 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state), and switch the motor conductive path LM to a conductive state or a non-conductive state based on the motor drive command Smd from the controller 62.

[0046] The controller 62 includes a microcomputer provided with a CPU, memory devices (ROM and RAM), signal I/O, and so on. The controller 62 receives the power supply via the DC supply line 81 described later. The controller 62 executes various processes as the CPU executes various programs stored in the recorders. Examples of the various processes include a motor control process for controlling the motor 61 by the motor drive command Smd, a fault determination process for determining whether a fault exists in the electrical work machine 1, an operation state switching process for selectively switching the operation state of the controller 62 to one of several operating conditions, etc.

[0047] The operating state at least includes a control operating state and a low power operating state. The control running state is a state in which a motor control process, a fault determination process, and so on can be executed. In the control running state, the controller 62 performs A-D conversion of measurement signals from various sensors (not shown) that measure the states (motor temperature, motor current, etc.) of each part of the electric working machine 1, and executes a fault detection process, etc. . In the case of the control operating state, the constant voltage Vcc, which is supplied from the constant voltage supply line 81, is the reference voltage for the A-D conversion. Because of this, a high voltage accuracy is required so that the voltage error can be reduced. The low power operating state has lower power consumption than the control operating state. The low power operating state is the so-called sleep state, in which the power consumption in the controller 62 is reduced. In the low power operating state, the controller 62 does not perform A-D conversion, etc. and does not perform comparison processes between the reference voltage (DC voltage Vcc) and measurement signals from different sensors. In the case of the low power operating state, the DC voltage Vcc, which is supplied from the DC voltage supply line 81, is not used as a reference voltage for the A-D conversion. As a result, the required voltage accuracy is lower than in the control operating state. The maximum current consumption value of the controller 62 in the driving operating state (first driving current value ICmax) is 100mA, and the maximum current consumption value of the controller 62 in the low power operating state (second driving current value ISmax) is 50µA.

[0048] The controller 62 is configured to transition the operating state of the controller 62 from the control operating state to the low power operating state when the user does not perform manipulation (such as manipulation of the trigger arm 9) for a predetermined sleep determination time Ts (5 minutes, for example ).

[0049] The controller 62 is configured to output a status notification signal Smo corresponding to an operating state during execution. In other words, the controller 62 outputs a status notification signal Smo indicating the control operating state (hereinafter, the first status notification signal Smo1) when the operation state transitions to the control operation state, and outputs a status notification signal Smo indicating the low power operation state ( hereinafter, the second status notification signal Smo2) when the operation state enters the low power operation state. The controller 62 outputs the status notification signal Smo to at least the control power supply 64 (the first reverse flow suppression means 69 to be described in detail later) and the operating state determination means 75 .

[0050] The trigger arm 9 is configured to output the trigger signal Str when the user performs a pull operation. The trigger arm 9 is configured to output the trigger signal Str at the same potential as the ground potential at the time the user executes the tension operation. The trigger signal Str is output to at least the controller 62 and the means 75 for determining the operating state.

[0051] The operating state determining means 75 is configured to determine whether the operating state of the controller 62 is a control operating state or a low power operating state. The operation state determination means 75 is configured to receive the status notification signal Smo and the trigger signal Str, and output the conduction command signal Sc1 according to each state of the status notification signal Smo and the trigger signal Str.

[0052] The operation state determination means 75 is configured to determine that the controller 62 is in the control operation state when the first status notification signal Smo1 or the trigger signal Str is received (in other words, during the execution of the tensioning operation by the user). The operation state determination means 75 is configured to determine that the controller 62 is in a low power operation state when the second status notification signal Smo2 is received and the trigger signal Str is not received (in other words, the tension operation is not executed by the user). The operation state determination means 75 is configured to output the conduction command signal Sc1 corresponding to the determination result.

[0053] [1-3. Control power supply]

The control power supply 64 converts the battery voltage VB from the battery pack 100 into a constant voltage Vcc, and outputs the constant voltage Vcc to the constant voltage supply line 81. The DC voltage Vcc is supplied to each component (such as the controller 62) of the electric work machine 1 via the DC voltage supply line 81. In the present embodiment, the constant voltage Vcc is 5V. The power supplied from the control power supply 64 via the DC voltage supply line 81 is used to operate the controller 62, for example.

[0054] The control power supply 64 includes a first converter 65, a first switch 67, a first reverse flow suppression means 69, a second converter 71, a second reverse flow suppression means 73, a first current path LC1, and a second current path LC2.

[0055] The first current path LC1 is part of the current path from the battery pack 100 to the controller 62 and is provided with the first converter 65. The second current path LC2 is connected in parallel with the first current path LC1 and is provided with the second converter 71. The first end of the first current path LC1 and the first end of the second current path LC2 is connected to the second node P2 and by the voltage conversion LC. The second end of the first current path LC1 and the second end of the second current path LC2 are connected to the third node P3 and the constant voltage supply line 81.

[0056] The first switch 67, the first converter 65, and the first reverse flow suppressor 69 are arranged in this order from the second node P2 to the third node P3 in the first current path LC1.

The first converter 65 includes a DC-DC converter that converts a DC voltage and outputs a resultant voltage. The first converter 65 converts the battery voltage VB, which is input to the input device 65a, into a constant voltage Vcc, and outputs the constant voltage Vcc through the first output means 65b. The first converter 65 outputs 5V as a constant voltage Vcc. The DC voltage Vcc is supplied to each component (such as the controller 62) of the electric work machine 1 via the DC voltage supply line 81. The first converter 65 has a characteristic of 100mA or more for the maximum output current for voltage conversion, and is configured to supply the maximum current consumption value of the controller 62 in the control operating state (the first control current value ICmax). The power consumption required to convert the voltage in the first converter 65 corresponds to a current consumption in the order of mA.

[0057] The first switch 67 is provided in the first current path LC1 between the second node P2 and the first converter 65. The first switch 67 is provided with a switch (such as a FET) connected in series with the first current path LC1. The first switch 67 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state) based on the conduction command signal Sc1 from the operation state determination means 75 . The first switch 67 is configured to switch the electrical conductivity of the first current path LC1 from the second node P2 to the first converter 65 to a conductive state or a non-conductive state. This allows the first switch 67 to switch the battery voltage input state VB to the first converter 65 based on the conduction command signal Sc1.

[0058] The first reverse flow suppression means 69 is provided in the first current path LC1 between the first converter 65 and the third node P3. The first reverse flow suppression means 69 includes a diode 69a connected in series with the first current path LC1 and a switch 69b in parallel with the diode 69a. Diode 69a provides electrical conduction from the first converter 65 to the third node P3, and inhibits electrical conduction from the third node P3 to the first converter 65. diode 69a. The first reverse flow suppression means 69 is configured to switch the switch 69a to a conductive state (ON state) or a non-conductive state (OFF state), and switch the first current path LC1 to a conductive state or a non-conductive state based on the status notification signal Smo from the controller 62.

[0059] As a result, when the switch 69b becomes non-conductive, the first reverse flow suppression means 69 conducts the current from the first output means 65b of the first converter 65 to the DC voltage supply line 81 through the diode 69a and suppresses the inflow of reverse current from the third node P3 to to the first output means 65b of the first converter. During current conduction from the first output means 65b to the constant voltage supply line 81 through the diode 69a, the constant voltage Vcc that is output from the first output means 65b falls on the forward voltage (vf) of the diode 69a and is output to the constant voltage supply line 81. Also, in the first reverse flow suppression means 69, when the switch 69b becomes conductive, the DC voltage Vcc that is output from the first output means 65b of the first converter 65 does not drop across the diode 69a and is output to the DC voltage supply line 81.

[0060] The second converter 71 and the second reverse flow suppressor 73 are arranged in this order in the second current path LC2 from the second node P2 to the third node P3.

The second converter includes a series regulator that converts the DC voltage and outputs the resulting voltage. The second converter 71 converts the battery voltage VB, which is input to the input device 71a, into a constant voltage Vcc, and outputs the constant voltage Vcc through the second output means 71b. The second converter 71 outputs 5V as a constant voltage Vcc. The DC voltage Vcc is supplied to each component (such as the controller 62) of the electric work machine 1 via the DC voltage supply line 81. The second converter 71 has a characteristic of 50 μA or more for the maximum output current for voltage conversion, and is configured to supply the maximum value of the current consumption of the controller 62 in a low-power operating state (second control current value ISmax). The power consumption required to convert the voltage in the second converter 71 corresponds to a current consumption in the order of μA. The second converter 71 has a lower maximum output current than the first drive current value ICmax and thus has a lower power consumption required for voltage conversion than the first converter 65.

[0061] A second reverse flow suppression means 73 is provided in the second current path LC2 between the second converter 71 and the third node P3. The second reverse flow suppression means 73 includes a diode connected in series with the second current path LC2. This diode is configured to provide electrical conduction from the second converter 71 to the third node P3 and to suppress electrical conduction from the third node P3 to the second converter 71. Thus, the second reverse flow suppression means 73 provides a voltage output, with a drop from the DC voltage Vcc to the forward voltage (Vf) of the diode, from the second output means 71b of the second converter 71 to the DC voltage supply line 81, and suppresses the inflow of reverse current from the third node P3 to the second output means 71b of the second converter 71.

[0062] The control power supply 64 configured in the above manner outputs the constant voltage Vcc using the first converter 65 and the second converter 71 upon receiving the conduction command signal Sc1 indicative of the control operation state from the operation state determination means 75, thereby shifting to a state in which control power is supplied to the controller 62 (hereinafter, the first conversion state).

[0063] Also, the control power supply 64 stops the voltage conversion by the first converter 65 and outputs the constant voltage Vcc using the second converter 71 upon receiving the conduction command signal Sc1 indicating the low-power operation state from the operation state determination means 75, thereby shifting to a state in which control power is supplied to the controller 62 (hereinafter, the second conversion state).

[0064] [1-4. Change in current consumption due to switching of the operating state in the controller]

The change in current consumption Ia in the control power supply 64 due to the switching of the operating state of the controller 62 will be described with reference to FIG. 3.

[0065] FIG. 3 shows the switching of the operating state of the controller 62 and the change of the consumed current over time from the time t0 as the time when the user has finished the pulling operation of the trigger arm 9.

During the period from the time t0 to the time t1 when the sleep determination time Ts has elapsed, when the state in which the user does not perform the pull operation of the trigger arm 9 continues, the controller 62 starts the operation state transition process (operation state switching process) from the control operation state to a low power working state.

[0066] The controller 62, when starting the operation state switching process, firstly executes a process for sequentially stopping the power supply to various devices and various circuits provided in the electric working machine 1. Along with this, the consumption current Ia is gradually reduced from the initial consumption current Ia0 ( time from t1 to t2), and the electric current equivalent to the current consumption (the first current change DIa1) in the various devices is reduced until it stops. The consumed current Ia at this point in time is reduced to the first consumed current Ia1.

[0067] The controller 62 then executes a process to output a status notification signal Smo indicating a low power operating state as one step of the operating state switching process (time t2). As a result, the voltage conversion by the first converter 65 is stopped and the electric current equivalent to the current consumption (the second current change DIa2) required for the voltage conversion in the first converter 65 is reduced. The consumed current Ia at this time is reduced to the second consumption current Ia2.

[0068] Then, the controller 62 executes a process for switching the controller 62 itself to a low power operating state (sleep mode) as the first step of the operating state switching process (time t3). As a result, the electric current equivalent to the current consumption (the third current change DIa3) corresponding to the difference between the current consumption in the driving operating state and the current consumption in the low-power operation state of the controller 62 is reduced, and the consumption current Ia at this point in time is reduced to the third consumption current Ia3 .

[0069] By executing these steps, the controller 62 performs the operation state switching process and maintains the low power operation state until the user performs the pull operation of the trigger arm 9.

Subsequently, when the user performs the pull operation of the trigger arm 9 (time t4), the trigger signal Str is input to the controller 62. As a result, the controller 62 itself enters the control operation state (wake up) from the low power operation state (sleep mode). The controller 62, which has been woken up, starts the work state switching process to change the work state from the low power work state to the control work state. Also, when the trigger signal Str from the trigger arm 9 is also input to the operation state determination means 75, and the conduction command signal Sc1 from the operation state determination means 75 is input to the control power supply 64, voltage conversion by the first converter starts. Accordingly, along with the wake-up of the controller 62 and the voltage conversion operation by the first converter 65, the consumed current Ia gradually increases to the first consumed current Ia1 (time t4 to t5).

[0070] The controller 62 then executes a process for outputting the status notification signal Smo (first status notification signal Smo1) indicating the control operating state as one step of the operating state switching process (time t5). As a result, the DC voltage Vcc, which is output from the first output means 65b of the first converter 65, is supplied to the DC voltage supply line 81 without a voltage drop.

[0071] The controller 62 then executes a process for sequentially starting power supply to various devices and various circuits provided in the electric working machine 1 as one step of the operation state switching process (time t6). At the same time, the current consumption Ia is increased to the initial current consumption Ia0.

[0072] As mentioned above, in the case where the operation state of the controller 62 enters the low power operation state, the electric work machine 1 of the present embodiment can stop the voltage conversion in the first converter 65 to reduce the consumption current Ia equivalent to the second current change DIa2.

[0073] [1-5. Result]

As described above in the electric working machine 1 of the present embodiment, in the case where the controller 62 is in a low-power operation state, the control power supply 64 enters the second conversion state, and the first converter 65 is not used to convert the voltage in the control power supply 64. Thus, the power consumption in the first converter 65 can be suppressed. As a result, in the case where the operation state of the controller 62 changes from the control running state to the low power running state when the electric machine 1 is not in use, not only the power consumption in the controller 62 can be reduced. , but also the power consumption in the first converter 65. Thus, the power consumption can be reduced when the electric working machine is not in use.

[0074] In the electric work machine 1, the control power supply 64 is configured to change the operation state to the first conversion state when the user manipulates the electric work machine 1 (for example, the pull operation of the trigger arm 9). In other words, in the case where the user operates the trigger arm 9, when the operation state of the control power supply 64 is the second conversion state, the control power supply 64 makes the transition of the operation state of the control power supply 64 from the second conversion state to the first conversion state. As a result, since at least the first converter 65 supplies the constant voltage Vcc, the controller 62 can receive the supply of the first control current value ICmax required in the control running state and control the motor 61.

[0075] The electric work machine 1 includes a first backflow suppression means 69. Because of this, the inflow of reverse current into the first output means 65b of the first converter 65 can be suppressed. the first backflow suppression means 69 .

[0076] The electric work machine 1 includes a second backflow suppression means 73. Because of this, the inflow of reverse current into the second output means 71b of the second converter 71 can be suppressed. the second means 73 for suppressing reverse flow.

[0077] In the electric working machine 1, the output voltage (constant voltage Vcc=5V) of the first converter 65 and the output voltage (constant voltage Vcc=5V) of the second converter 71 have the same voltage value, and the first reverse flow suppression means 69 is provided with a switch 69b in parallel with the diode 69a, and the second reverse flow suppression means 73 includes a diode. Thus, in the case where the controller 62 enters the control running state and both the first converter 65 and the second converter 71 output voltage, as well as the switch 69b is in the ON state, the voltage that is output from the first converter 65 to the line 81 of the DC voltage supply, and the voltage which is output from the second converter 71 to the DC supply line 81 through the second reverse flow suppression means 73 have different values. Specifically, in the case where the controller 62 is in the control running state, the voltage that is output from the first converter 62 to the DC supply line 81 is the constant voltage Vcc, while the voltage that is output from the second converter 71 to the DC supply line 81 voltage through the second reverse flow suppression means 73 is a voltage with a drop from the constant voltage Vcc to the forward voltage (Vf) of the diode. Accordingly, in the case where the controller 62 is in the control running state, only the voltage that is output from the first converter 65 is supplied to the controller 62. Thus, it can be refrained from supplying the maximum current consumption value of the controller 62 from the second converter 71, which has no power. filing.

[0078] In the electric working machine 1, the operating state determining means 75 is configured to receive the first status notification signal Smo1 and the second status notification signal Smo2. The operation state determining means 75, upon receiving the first status notification signal Smo1, determines that the operation state of the controller 62 is the control operation state, and upon receiving the second status notification signal Smo2 determines that the operation state of the controller 62 is the low power operation state. In other words, the operation state determination means 75 may determine the operation state of the controller 62 based on the first status notification signal Smo1 and the second status notification signal Smo2.

[0079] [1-6. Correspondence relation between concepts]

The motor 61 corresponds to one example of a driving device, and the battery pack 100 corresponds to one example of a power source.

[0080] The controller 62 and the motor driver 63 correspond to one example of a controller.

[0081] [2. Second Embodiment]

As the second embodiment, the second electric work machine 21 constructed by replacing some components of the electric work machine 1 in the above-mentioned embodiment (hereinafter, the first embodiment) will be described.

[0082] As shown in FIG. 4, the second electric work machine 21 includes a second control power supply 91, a brushless motor 97, and a motor driver 99 instead of the control power supply 64, motor 61, motor driver of the electric work machine 1.

[0083] [2-1. Second control power supply]

The second control power supply 91 includes a third converter 93 and a fourth converter 95 instead of the first converter 65 at the control power supply 64 .

[0084] The third converter 93 includes a DC-DC converter that converts a DC voltage and outputs the converted voltage. The third converter 93 converts the battery voltage VB, which is input to the input device 93a, into the second constant voltage Vdd, and outputs the second constant voltage Vdd through the output means 93b. The third converter 93 outputs 15V as the second constant voltage Vdd. The third converter 93 has a maximum output current of 150mA for voltage conversion.

[0085] The fourth converter 95 includes a series regulator that converts the DC voltage and outputs the converted voltage. The fourth converter 95 converts the second constant voltage Vdd, which is input to the input device 95a, into a constant voltage Vcc, and outputs the constant voltage Vcc through the output means 95b. The fourth converter 95 outputs 5V as a constant voltage Vcc. The fourth converter 95 has a maximum output current of 100mA for voltage conversion.

[0086] In other words, the second control power supply 91 can convert the battery voltage VB into a constant voltage Vcc using the third converter 93 and the fourth converter 95. The constant voltage Vcc is supplied to each component (such as the controller 62) of the second electrical work machine 21 via line 81 supply of direct voltage. The power consumption required for voltage conversion in the third converter 93 and the fourth converter 95 corresponds to a current consumption of the order of mA.

[0087] The second control power supply 91 configured in the above manner, upon receiving the conduction command signal Sc1 indicating the control operation state from the operation state determination means, outputs the constant voltage Vcc using the third converter 93 and the fourth converter 95, and outputs the constant voltage Vcc using the second converter 71, thereby entering a state for supplying control power to the controller 62 (hereinafter, the first conversion state).

[0088] Also, the second control power supply 91, upon receiving the conduction command signal Sc1 indicating the low-power operation state from the operation state determination means 75, stops the voltage conversion by the third converter 93 and the fourth converter 95, and outputs the constant voltage Vcc using the second converter 71, thereby shifting to a state for supplying control power to the controller 62 (hereinafter, the second conversion state).

[0089] The brushless motor 97 includes a 3-phase brushless motor. The motor driver 99 converts the direct current from the battery pack 100 into a 3-phase AC current (U-PHASE drive current, V-PHASE drive current, and W-PHASE drive current) to drive the brushless motor 97, and outputs the current to the brushless motor 97. Driver 99 motor drives the brushless motor 97 in accordance with the motor drive command Smd which is input from the controller 62.

[0090] [2-2. Change in current consumption due to switching of the operating state in the controller]

The change in current consumption Ia in the second control power supply 91 due to the switching of the operating state of the controller 62 will be described with reference to FIG. 5.

[0091] FIG. 5 shows the switching of the operating state of the controller 62 and the change of the consumed current Ia with the lapse of time from the time t0 as the time when the user has finished the pulling operation of the trigger arm 9.

During the period from the time t0 to the time t11 when the sleep determination time Ts has elapsed, when the state in which the user does not perform the pull operation of the trigger arm 9 continues, the controller 62 starts the process for the operation state transition (the operation state switching process) from the control working state to low power working state.

[0092] The controller 62, when starting the operation state switching process, first executes the process of sequentially stopping the power supply to the various devices and various circuits provided in the second electrical operating machine 21. Along with this, the consumption current Ia is gradually reduced from the tenth consumption current Ia10 (time from t11 to t12), and the electric current is reduced, equivalent to the current consumption (first change DIa11 current) in different devices until it stops. The current consumption Ia at this time is reduced to the eleventh current consumption Ia11.

[0093] The controller 62 then executes a process for outputting a status notification signal Smo indicating a low power operating state as one step of the operating state switching process (time t12). As a result, the voltage conversion by the third converter 93 and the fourth converter 95 is stopped and the electric current equivalent to the current consumption (second current change DIa12) required for the voltage conversion in the third converter 93 and the fourth converter 95 is reduced. The current consumption Ia at this time is reduced to twelfth consumed current Ia12.

[0094] The controller 62 executes a process for switching the controller 62 itself to a low power operating state (sleep mode) as one step of the operating state switching process (time t13). As a result, the electric current equivalent to the current consumption (the third current change DIa13) corresponding to the difference between the current consumption in the control operating state and the current consumption in the low-power operation state of the controller 62 is reduced. The consumption current Ia at this point in time is reduced to the thirteenth consumption current Ia13.

[0095] By executing these steps, the controller 62 performs the operation state switching process and maintains the low power operation state until the user performs the pull operation of the trigger arm 9.

Subsequently, when the user performs the pull operation of the trigger arm 9 (time t14), the controller 62 receives the trigger signal Str. As a result, the controller 62 itself enters the control operating state (waking up) from the low power operating state (sleep mode). The controller 62, which has been woken up, starts the work state switching process to change the work state from the low power work state to the control work state. Also, the trigger signal Str from the trigger arm 9 is also input to the operation state determination means 75, and the conduction command signal Sc1 from the operation state determination means 75 is input to the second control power supply 91 . As a result, voltage conversion is started by the third converter 93 and the fourth converter 95. Accordingly, along with the wake-up of the controller 62 and the voltage conversion operation of the third converter 93 and the fourth converter 95, the consumption current Ia is gradually increased to the eleventh consumption current Ia11 (time t14 to t15).

[0096] The controller 62 then executes a process for outputting the status notification signal Smo (first status notification signal Smo1) indicating the control operating state as one step of the operating state switching process (time t15). As a result, the DC voltage Vcc which is output from the output means 95b of the fourth converter 95 is supplied to the DC voltage supply line 81 without a voltage drop.

[0097] The controller 62 then executes a process for sequentially starting to supply power to various devices and various circuits provided in the second electric operating machine 21 as one step of the operation state switching process (time t16). At the same time, the absorbed current Ia is increased to the tenth of the consumed current Ia10.

[0098] As mentioned above, the second electric operating machine 21 stops the voltage conversion in the third converter 93 and the fourth converter 95 in the case where the operation state of the controller 62 enters the low power operation state. Thus, the consumed current Ia equivalent to the second current change DIa12 can be reduced.

[0099] [2-3. Result]

As described above in the second electric operating machine 21 of the second embodiment, in the case where the controller 62 is in the low power running state, the second control power supply 91 changes to the second conversion state, and the third converter 93 and the fourth converter 95 are not used for voltage conversion. in the second control power supply 91. Thus, the power consumption in the third converter 93 and the fourth converter 95 can be suppressed. not only the power consumption in the controller 62, but also the power consumption in the third converter 93 and the fourth converter 95. Thus, the power consumption can be reduced when the second electric work machine 21 is not in use.

[0100] [2-4. Correspondence relation between concepts]

The controller 62 and the motor driver 99 correspond to one example of a controller, the brushless motor 97 corresponds to one example of a driving device, and the third converter 93 and the fourth converter 95 correspond to one example of the first converter.

[0101] [3. Third Embodiment]

As the third embodiment, the third electric work machine 23 made by replacing some components of the second electric work machine 21 in the second embodiment will be described.

[0102] As shown in FIG. 6, the third electric work machine 23 includes a third control power supply 111 in place of the second control power supply 91 of the second electric work machine 21.

[3-1. Third control power supply]

The third control power supply 111 converts the battery voltage VB into a constant voltage Vcc and outputs the constant voltage Vcc to the constant voltage supply line 81 . The constant voltage Vcc is supplied to each part (such as the controller 62) of the third electric work machine 23 through the constant voltage supply line 81. In the third embodiment, the constant voltage Vcc is 5V. The power supply which is supplied through the DC voltage supply line 81 is used as the operating power of the controller 62, etc., for example.

[0103] The third control power supply 111 includes a third converter 93, a first switch 67, a backflow suppression means 113, a fourth converter 95, a shunt current detection means 115, a third current path LC3, a shunt current path LC4, and a common current path LC5.

[0104] The third converter 93, the first switch 67, the fourth converter 95 in the third embodiment have exactly the same configuration as that in the second embodiment.

[0105] The third current path LC3 is part of the current path from the battery pack 100 to the controller 62 and is provided with the third converter 93. The shunt current path LC4 is connected in parallel with the third current path LC3. The common current path LC5 is directly connected to the third current path LC3 and the shunt current path LC4, and is provided to the fourth converter 95.

[0106] The first end of the third current path LC3 and the first end of the shunt current path LC4 are connected to the fourth node P4 and by the voltage conversion LC. The second end of the third current path LC3 and the second end of the shunt current path LC4 are connected to the fifth node 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 DC voltage supply line 81 .

[0107] A reverse flow suppression means 113 is provided in the third current path LC3 between the third converter 93 and the fifth node P5. The reverse flow suppression means 113 is provided with a diode connected in series with the third current path LC3. This diode is arranged to provide electrical conduction from the third converter 93 to the fifth node P5 and to suppress the electrical conduction from the fifth node P5 to the third converter 93. Thus, the reverse flow suppression means 113 causes the DC voltage Vcc to be output from the output means 93b of the third converter 93 to the fifth node P5 and suppresses the inflow of reverse current from the fifth node P5 to the output means 93b of the third converter 93.

[0108] A shunt current detecting means 115 is provided in the shunt current path LC4. The shunt current detection means 115 includes a detection resistor 117 and a current detection means 119 . The detection resistor 117 includes a resistor element connected in series with the shunt current path LC4 and can output a detection voltage corresponding to the shunt current Ibp flowing through the shunt current path LC4. The current detecting means 119 includes a FET, and is configured to output a current notification signal Sia corresponding to the shunt current Ibp to the operating state detecting means 75 based on the voltage at both ends of the detection resistor 117.

[0109] In the case where the first switch 67 is OFF and the operation state of the controller 62 is in the control operation state, the power consumption in the controller 62 and the like through the DC voltage supply line 81 increases and the shunt current Ibp increases. Thus, the potential of the input device 95a at the fourth converter 95 is reduced. Also, in the case where the first switch 67 is OFF and the operation state of the controller 62 is in the low power operation state, the power consumption in the controller 62 and the like through the DC voltage supply line 81 is reduced and the shunt current Ibp is reduced. Thus, the potential of the input device 95a at the fourth converter 95 is increased.

[0110] The current detecting means 119 is configured to output the current notification signal Sia corresponding to the shunt current Ibp. In the case where the shunt current Ibp is greater than the predetermined operating reference value Ith (for example, 5mA), the FET turns on and the current detection means 119 outputs a current notification signal Sia with the same potential as the battery voltage VB (hereinafter, the first signal Sia1 current notifications). In the case where the shunt current Ibp is equal to or less than the operating reference value Ith, the FET turns off and the current detecting means 119 outputs a current notification signal Sia with a potential lower than that of the battery voltage VB (hereinafter, the second current notification signal Sia2).

[0111] In other words, the shunt current determination means 115 is configured to determine whether the operation state of the controller 62 is a control operation state or a low power operation state based on a comparison result between the shunt current Ibp and the operation reference value Ith.

[0112] The current determination means 119, when determining that the operation state of the controller 62 is the control operation state, outputs the first current notification signal Sia1 to the operation state determination means 75. As a result, the conduction command signal Sc1 indicating the control operation state is output from the operation state determination means 75 to the first switch 67, and voltage conversion is executed by the third converter 93. At this time, the third control power supply 111 outputs the constant voltage Vcc using the third converter 93 and the fourth converter 95, thereby shifting the state to supply control power to the controller 62 (hereinafter, the first conversion state).

[0113] The current determination means 119, when determining that the operation state of the controller 62 is a low power operation state, outputs the second current notification signal Sia2 to the operation state determination means 75. As a result, the conduction command signal Sc1 indicating the low-power operation state is output from the operation state determining means 75 to the first switch 67, and the voltage conversion by the third converter 93 is stopped. At this time, the third control power supply 111 outputs the constant voltage Vcc using the fourth converter 95, thereby entering the state of supplying control power to the controller 62 (hereinafter, the second conversion state).

[0114] [3-2. Change in current consumption due to switching of the operating state in the controller]

The change in current consumption Ia in the third control power supply 111 due to the switching of the operating state of the controller 62 will be described with reference to FIG. 7.

[0115] FIG. 7 shows the switching of the operating state of the controller 62 and the change of the consumed current over time from the time t0 as the time when the user has finished the pulling operation of the trigger arm 9.

During the period from the time t0 to the time t21 when the sleep determination time Ts has elapsed, when the state in which the user does not perform the pull operation of the trigger arm 9 continues, the controller 62 starts the operation state transition process (operation state switching process) from the control operation state to a low power working state.

[0116] The controller 62, when starting the operation state switching process, first executes a process for sequentially stopping the power supply to various devices and various circuits provided in the third electric operating machine 23. Along with this, the consumption current Ia is gradually reduced from the twentieth consumption current Ia20 (time s t21 to t22) and reduces the electric current equivalent to the current consumption (first change DIa21 current) in various devices until it stops. The current consumption Ia at this point in time is reduced to the twenty-first consumption current Ia21.

[0117] The controller 62 then executes a process for switching the controller 62 itself to a low power operating state (sleep mode) as one step of the operating state switching process (time t22). As a result, the electric current equivalent to the current consumption (second current change DIa22) corresponding to the difference between the current consumption in the control running state and the current consumption in the low-power running state of the controller 62 is reduced, and the current consumption Ia at this point in time is reduced to the twenty second consumption current. Ia22. The second current change DIa22 corresponds to the third current change DIa3 of the first embodiment and the third current change DIa13 of the second embodiment.

[0118] Subsequently, when the shunt current determination means 115 determines that the operation state of the controller 62 is a low power operation state due to the decrease in the current consumption of the controller 62, the conduction command signal Sc1 indicating the low power operation state is output from the determination means 75 operating state to the first switch 67 and the voltage conversion by the third converter 93 is stopped. As a result, the electric current equivalent to the current consumption (the third current change DIa23) required to convert the voltage in the third converter 93 is reduced, and the consumption current Ia at this time is reduced to the twenty-third consumption current Ia23. The third current change DIa23 corresponds to the second current change DIa2 of the first embodiment and the second current change DIa12 of the second embodiment.

[0119] By executing these steps, the controller 62 performs the operation state switching process and maintains the low power operation state until the user performs the pull operation of the trigger arm 9.

Subsequently, when the user performs the pull operation of the trigger arm 9 (time t24), the trigger signal Str is input to the controller 62. As a result, the controller 62 itself enters the control operation state (wake up) from the low power operation state (sleep mode). The controller 62, which has been woken up, starts the work state switching process to change the work state from the low power work state to the control work state. Also, when the trigger signal Str from the trigger arm 9 is also input to the operation state determination means 75, and the conduction command signal Sc1 from the operation state determination means 75 is input to the third control power supply 111, voltage conversion by the third converter 93 is started. Accordingly, along with wake-up controller 62 and a voltage conversion operation by the third converter 93, the consumption current Ia is gradually increased to the twenty-first consumption current Ia21 (time t24 to t25). The consumption current Ia increases by the second current change DIa22 from the twenty-third consumption current Ia23 by waking up the controller 62 and becomes the twenty-fourth consumption current Ia24 (time t24). Subsequently, the consumed current Ia is increased by the third current change DIa23 by the voltage conversion operation of the third converter 93, and becomes the twenty-first consumed current Ia21 (time t25).

[0120] At this time, when the shunt current determination means 115 determines that the operation state of the controller is the control operation state due to the increase in current consumption in the controller 62, the conduction command signal Sc1 indicating the control operation state is output from the operation state determination means 75 to the first switch 67. At this time, the voltage conversion by the third converter 93 is already being executed based on the trigger signal Str from the trigger manipulator 9. However, even if the user has finished operating the trigger manipulator 9, the control operation state of the controller 62 is maintained and the voltage conversion by the third converter 93 continues until the sleep determination time Ta elapses.

[0121] The controller 62 then executes a process for successively starting to supply power to various devices and various circuits provided in the third electric operating machine 23 as one step of the operation state switching process (time t26). At the same time, the absorbed current Ia is increased to the twentieth of the consumed current Ia20.

[0122] As mentioned above, the third electric operating machine, when the operation state of the controller 62 enters the low power operation state, stops the voltage conversion in the third converter 93 based on the determination result by the shunt current determination means 115, thereby reducing the consumption current Ia equivalent to the third change DIa23 current.

[0123] [3-3. Result]

As described above in the third electric operating machine 23 of the third embodiment, in the case where the controller 62 is in the low power running state, the third control power supply 111 changes to the second conversion state based on the determination result by the shunt current determination means 115 and the third converter 93 is not used for voltage conversion in the third control power supply 111 . Thus, the power consumption in the third converter 93 can be suppressed. the controller 62, but also the power consumption in the third converter 93. Thus, the power consumption can be reduced when the third electric working machine is not in use.

[0124] [3-4. Conformity of concepts]

The controller 62 and the motor driver 99 correspond to one example of a controller, the brushless motor 97 corresponds to one example of a driving device, the third converter 93 corresponds to one example of the first converter, and the fourth converter 95 corresponds to one example of the second converter.

[0125] The operating state determination means 75 and the shunt current determination means 115 correspond to one example of the operating state determination means, and the second constant voltage Vdd corresponds to one example of the first control voltage.

[0126] [4. Fourth Embodiment]

As the fourth embodiment, the fourth electric work machine 25 made by replacing some components of the third electric work machine 23 in the third embodiment will be described.

[0127] As shown in FIG. 8, the fourth electric work machine 25 includes a fourth control power supply 121 and a second shunt current detection means 131 in place of the third control power supply 111 and the shunt current detection means 115 of the third electric work machine 23, respectively.

[0128] [4-1. Fourth control power supply]

The fourth control power supply 121 converts the battery voltage VB into a constant voltage Vcc and outputs the constant voltage Vcc to the constant voltage supply line 81 . The DC voltage Vcc is supplied to each part (such as the controller 62) of the fourth electrical work machine 25 via the DC voltage supply line 81. In the fourth embodiment, the constant voltage Vcc is 5V. The power supplied from the fourth control power supply 121 via the DC voltage supply line 81 is used as the operating power of the controller 62, etc., for example.

[0129] The fourth control power supply 121 includes a third converter 93, a first switch 67, a reverse flow suppressor 113, a fourth converter 95, a limiting resistor 123, a third current path LC3, a shunt current path LC4, and a common current path LC5.

[0130] The third converter 93, the first switch 67, the fourth converter 95, the third current path LC3, the shunt current path LC4, and the common current path LC5 in the fourth embodiment have exactly the same configuration as that in the third embodiment.

[0131] The limiting resistor 123 is connected in series with the shunt current path LC4. The limiting resistor 123 includes a resistive element and prevents the shunt current Ibp that flows in the shunt current path LC4 from becoming excessive.

[0132] The second shunt current detecting means 131 includes a hysteresis comparator 133, a resistor 135, a resistor 134, and a reference voltage 136. The second shunt current detecting means 131 is electrically connected to the fifth node P5 via the sixth path LC6 and is configured to detect the potential of the device 95a inputting the fourth converter 95 and detecting the shunt current Ibp. The second shunt current determination means 131 is configured to output the current notification signal Sia corresponding to the shunt current Ibp to the operation state determination means 75 .

[0133] As described in the third embodiment, in the case where the first switch 67 is OFF and the operation state of the controller 62 is the control operation state, power consumption in the controller 62, etc. through the DC supply line 81 is increased and the shunt current Ibp is increased. Thus, the potential of the input device 95a of the fourth converter 95 is reduced. Also, in the case where the first switch 67 is OFF and the operation state of the controller 62 is a low power operation state, the power consumption in the controller 62, etc. through the DC supply line 81 decreases and the shunt current Ibp increases. Thus, the potential of the input device 95a of the fourth converter 95 is increased.

[0134] The second shunt current detecting means 131 outputs the current notification signal Sia at the same potential as the battery voltage VB (hereinafter, the first current notification signal Sia1) when the specific condition is met. Here, the specific condition is that the shunt current Ibp is higher than the predetermined operating reference value Ith (for example, 5mA) and the potential of the fifth node P5 (input means 95a of the fourth converter 95) is lower than the detection voltage Vth. The second shunt current detection means 131, when the shunt current Ibp is equal to or lower than the operation reference value Ith, and the potential of the fifth node P5 (input device 95a of the fourth converter 9) exceeds the detection voltage Vth, outputs a current notification signal Sia with a lower potential than the voltage VB battery (hereinafter the second current notification signal Sia2).

[0135] In other words, the second shunt current determination means 131 is configured to determine whether the operation state of the controller 62 is a control operation state or a low power operation state based on a comparison result between the shunt current Ibp and the operation reference value Ith.

[0136] The second shunt current detection means 131 includes a hysteresis comparator 133, and can set the detection voltage Vth used to determine the output of the first current notification signal Sia1 (hereinafter, the first detection voltage Vth1), and the detection voltage Vth used to determine the output of the second current notification signal Sia2 (hereinafter the second detection voltage Vth2), to different values.

[0137] For example, in the case where the output voltage of the reference voltage 136 is set to be the determination voltage Vth (= Vdd + DVa=17V) obtained by adding said adjustment voltage DVa (= 2V) to the second constant voltage Vdd, and the hysteresis width is set to 1V by the hysteresis comparator 133, the first detection voltage Vth1 is 16V and the second detection voltage Vth2 is 18V.

[0138] In this case, when the potential of the fifth node P5 (fourth converter input device 95a) falls below 16V, the second shunt current determination means 131 determines that the operation state of the controller 62 is the control operation state, and starts outputting the first current notification signal Sia1. Subsequently, while the potential of the fifth node P5 is equal to or lower than 18V, the second shunt current determination means 131 determines that the operation state of the controller 62 is the control operation state, and continues to output the first current notification signal Sia1. Subsequently, when the potential of the fifth node P5 exceeds 18V, the second shunt current determination means 131 determines that the operation state of the controller 62 is a low power operation state, and starts outputting the second current notification signal Sia2. Subsequently, while the potential of the fifth node P5 is equal to or higher than 16V, the second shunt current determination means 131 determines that the operation state of the controller 62 is a low power operation state, and continues to output the second current notification signal Sia2. Subsequently, when the potential of the fifth node P5 falls below 16V, the second shunt current detection means 131 starts outputting the first current notification signal Sia1.

[0139] The second shunt current determination means 131 outputs the first current notification signal Sia1 to the operation state determination means 75 when determining that the operation state of the controller 62 is the control operation state. As a result, the conduction command signal Sc1 indicating the control operation state is output from the operation state determination means 75 to the first switch 67, and voltage conversion is executed by the third converter 93. At this time, the fourth control power supply 121 outputs the constant voltage Vcc using the third converter 93 and the fourth converter 95, thereby shifting to the state of supplying control power to the controller 62 (hereinafter, the first conversion state).

[0140] The second shunt current determination means 131 outputs the second current notification signal Sia2 to the operation state determination means 75 when determining that the operation state of the controller 62 is a low power operation state. As a result, the conduction command signal Sc1 indicating the low-power operation state is output from the operation state determination means 75 to the first switch 67, and the voltage conversion by the third converter 93 is stopped. At this time, the fourth control power supply 121 outputs the constant voltage Vcc using the fourth converter 95, thereby shifting to a state of supplying control power to the controller 62 (hereinafter, the second conversion state).

[0141] [4-2. Change in current consumption due to switching the working state of the controller]

The change in current consumption Ia in the fourth control power supply 121 due to the switching of the operating state of the controller 62 will be described with reference to FIG. 9.

[0142] FIG. 9 shows the switching of the operating state of the controller 62 and the change of the consumed current over time from the time t0 as the time when the user has finished the pulling operation of the trigger arm 9.

During the time period from the time t0 to the time t31 when the sleep determination time Ts has elapsed, when the state in which the user does not perform the pull operation of the trigger arm 9 continues, the controller 62 starts the process for the transition of the working state (the working state switching process) from control working state to low power working state.

[0143] The controller 62, when starting the operation state switching process, first executes a process for sequentially stopping the power supply to various devices and various circuits provided in the fourth electric working machine 25. Along with this, the consumption current Ia is gradually reduced from the thirtieth consumption current Ia30 (time from t31 to t32), and the electric current equivalent to the current consumption (the first current change DIa31) in the various devices is reduced until it stops. The current consumption Ia at this point in time is reduced to the thirty-first consumption current Ia31.

[0144] The controller 62 then executes a process for switching the controller 62 itself to a low power operating state (sleep mode) as one step of the operating state switching process (time t32). As a result, the electric current equivalent to the current consumption (second current change DIa32) corresponding to the difference between the current consumption in the control operating state and the current consumption in the low-power operation state of the controller 62 is reduced, and the consumption current Ia at this point in time is reduced to the thirty-second consumption current Ia32 .

[0145] Subsequently, when the second shunt current determination means 131 determines that the operating state of the controller 62 is a low power operating state due to a decrease in the current consumption of the controller 62, a conduction command signal Sc1 indicating the low power operating state is output from the means 75 determining the operating state to the first switch 67, and the voltage conversion by the third converter 93 is stopped. thirty third current consumption Ia33.

[0146] By executing these steps, the controller 62 performs the operation state switching process and maintains the low power operation state until the user performs the pull operation of the trigger arm 9.

Subsequently, when the user performs the pull operation of the trigger arm 9 (time t34), the trigger signal Str is input to the controller 62. As a result, the controller 62 itself enters the control operation state (wake up) from the low power operation state (sleep mode). The controller 62, which has been woken up, starts the work state switching process to change the work state from the low power work state to the control work state. Also, when the trigger signal Str from the trigger arm 9 is also input to the operation state determination means 75, and the conduction command signal Sc1 from the operation state determination means 75 is input to the fourth control power supply 121, voltage conversion by the third converter 93 is started. Accordingly, along with the wake-up of the controller 62 and the voltage conversion operation by the third converter 93, the consumption current Ia is gradually increased to the thirty-first consumption current Ia31 (time t34 to t35). The consumed current Ia is increased by the second current change DIa32 from the thirty-third consumption current Ia33 by waking up the controller 62 and becomes the thirty-fourth consumption current Ia34 (time t34). Subsequently, the consumption current Ia is increased by the third current change DIa33 by the voltage conversion operation of the third converter 93, and becomes the thirty-first consumption current Ia31 (time t35).

[0147] At this time, when the second shunt current determination means 131 determines that the operation state of the controller 62 is the control operation state due to the increase in current consumption in the controller 62, the conduction command signal Sc1 indicating the control operation state is output from the determination means 75. operation state to the first switch 67. At this time, the voltage conversion by the third converter 93 is already executed based on the trigger signal Str from the trigger arm 9. However, even if the user has finished the operation of the trigger arm 9, the control operation state of the controller 62 is maintained and the voltage conversion by the third converter 93 continues until the sleep determination time Ts elapses.

[0148] Then, the controller 62 executes the process of successively starting power supply to various devices and various circuits provided in the fourth electric operating machine 25 as one step in the operation state switching process (time t36). At the same time, the current consumption Ia is increased to the thirtieth current consumption Ia30.

[0149] As mentioned above, the fourth electric operating machine 25, when the operation state of the controller 62 enters the low-power operation state, stops the voltage conversion in the third converter 93 based on the determination result by the second shunt current determination means 131, thereby reducing the consumption current Ia equivalent to the third change of DIa33 current.

[0150] [4-3. Result]

As described above, in the fourth electric operating machine 25 of the fourth embodiment, in the case where the controller 62 is in the low power operation state, the fourth control power supply 121, based on the determination result in the second shunt current determination means 131, enters the second conversion state, and the third the converter 93 is not used to convert the voltage in the fourth control power supply 121 . Thus, the power consumption in the third converter 93 can be suppressed. the controller 62, but also the power consumption in the third converter 93. Thus, the power consumption can be reduced when the fourth electric work machine 25 is not in use.

[0151] [4-4. Conformity of concepts]

The fourth electric operating machine 25 corresponds to one example of the electric operating machine, and the operating state determination means 75 and the second shunt current determination means 131 correspond to one example of the operating state determination means.

[0152] [5. Fifth Embodiment]

As the fifth embodiment, the fifth electric work machine 27 made by replacing some components of the second electric work machine 21 in the second embodiment will be described.

[0153] As shown in FIG. 10, the fifth electric work machine 27 includes a fifth control power supply 141 and a multi-output power supply 102 in place of the second control power supply 91 and battery pack 100 of the second electric work machine 21, respectively.

[0154] The multiple output power supply 102 includes battery packs (first battery pack 103 and second battery pack 104), voltage output means (first voltage output means 102a and second voltage output means 102b), and a voltage reference 102c.

[0155] The first battery pack 103 and the second battery pack 104 are connected in series. Each of the first battery pack 103 and the second battery pack 104 includes a rechargeable battery (not shown) that can be repeatedly charged and discharged. The first battery pack 103 has an output voltage of 36V. The second battery pack 104 has an output voltage of 36V.

[0156] The first voltage output means 102a is connected to the positive electrode of the second battery pack 104. The second voltage output means 102b is connected to the positive electrode of the first battery pack 103 and the negative electrode of the second battery pack 104. The reference voltage 102c is connected to the negative electrode of the first battery pack 103 .

[0157] The multiple output power supply 102 is configured such that each of the voltage output means (the first voltage output means 102a and the second voltage output means 102b) outputs a different voltage based on the reference voltage 102c. The multiple output power supply 102 outputs the first battery voltage VB1 (VB1=72V) from the first voltage output means 102a, and outputs the second battery voltage VB2 (VB2=36V) from the second voltage output means 102b.

[0158] The first battery pack 103 outputs the first interrupt command signal Sb1 in the event of a fault condition such as an output voltage drop. The second battery pack 104 outputs the second interrupt command signal Sb2 in the event of a fault condition such as an output voltage drop.

[0159] [5-1. Fifth control power supply]

The fifth control power supply 141 converts the first battery voltage VB1 or the second battery voltage VB2 into a constant voltage Vcc, and outputs the constant voltage Vcc (Vcc=5V) to the constant voltage supply line 81.

[0160] The fifth control power supply 141 is configured by the second control power supply 91 to which the second switch 143 and the third switch 145 are added, and in which the connection destination of the second current path LC2 is changed. The following description mainly describes the difference between the second control power supply 91 and the fifth control power supply 141 .

[0161] The first end of the second current path LC2 is connected to the second voltage output means 102b of the multi-output power supply 102. The second end of the second current path LC2 is connected to the third node P3 and the DC voltage supply line 81 .

[0162] The second switch 143 and the third switch 145 are provided in the second current path LC2 between the input device 71a of the second converter 71 and the second voltage output means 102b of the multi-output power supply 102. Each of the second switch 143 and the third switch 145 is provided with a switch (such as a FET) connected in series with the second current path LC2.

[0163] The second switch 143 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state) based on the first interrupt command signal Sb1 from the first battery pack 103. The third switch 145 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state) based on the second interrupt command signal Sb2 from the second battery pack 104.

[0164] The second switch 143 and the third switch 145 are configured to switch the electrical conduction in the second current path LC2 from the second voltage output means 102b to the second converter 71 into a conductive state or a non-conductive state. This allows the second switch 143 and the third switch 145 to switch the input state of the second battery voltage VB2 to the second converter based on the first interrupt command signal Sb1 and the second interrupt command signal Sb2.

[0165] The third converter 93 is provided with a DC-DC converter that converts the DC voltage and outputs the converted voltage. The third converter 93 converts the first battery voltage VB1 (VB1=72V) which is inputted to the input device 93a into a second constant voltage Vdd, and outputs the second constant voltage Vdd through the output means 93b. The third converter 93 outputs 15V as the second constant voltage Vdd. The third converter 93 has a maximum output current of 150mA for voltage conversion.

[0166] The fifth control power supply 141 configured as described above, upon receiving the conduction command signal Sc1 indicating the control operation state from the operation state determination means 75, outputs a constant voltage Vcc using the third converter 93 and the fourth converter 95, and outputs the constant voltage voltage Vcc using the second converter 71, thereby entering a state for supplying control power to the controller 62 (hereinafter, the first conversion state).

[0167] Also, the fifth control power supply 141, upon receiving the conduction command signal Sc1 indicating the low power operation state from the operation state determination means 75, stops the voltage conversion by the third converter 93 and the fourth converter 95, and outputs the constant voltage Vcc using the second converter 71, thereby entering a state for supplying control power to the controller 62 (hereinafter, the second conversion state).

[0168] In addition, the fifth control power supply 141 sets the second switch 143 or the third switch 145 to a non-conductive state based on the first interrupt command signal Sb1 from the first battery pack 103 or the second interrupt command signal Sb2 from the second battery pack 104, thereby stopping input second battery voltage VB2 to the second converter 71. In other words, when at least one of the first battery pack 103 and the second battery pack 104 is in a fault state, the fifth control power supply 141 is configured to stop inputting the second battery voltage VB2 to the second converter. 71, thereby stopping the output of the constant voltage Vcc by the second converter 71.

[0169] Also, the fifth control power supply 141 may include a power hold circuit 147 . The power holding circuit 147 is connected to the first current path LC1 between the third converter 93 and the fourth converter 95. The power holding circuit 147 includes a resistor 147a, a diode 147b, and a capacitor 147c.

[0170] The power holding circuit 147 is configured to charge the capacitor 147c through the resistor 147a, and discharge the capacitor 147c through the diode 147b. This allows the power holding circuit 147 to quickly discharge the capacitor 147c while holding back the second DC voltage Vdd due to the inrush current at the start of charging the capacitor 147c.

[0171] With the power holding circuit 147, the second constant voltage Vdd and the constant voltage Vcc can be provided by the electric charge that charges the capacitor 147 of the power holding circuit 147 for a certain period after the third converter 93 stops outputting the second constant voltage Vdd , and the controller 62 can be activated. Because of this, even if the multi-output power supply 102 is suddenly removed or the output (power supply) of the multi-output power supply 102 is lost due to some failure, the second constant voltage Vdd and the constant voltage Vcc are provided by discharging the capacitor 147c. Because of this, the controller 62 can properly practice the shutdown process. The shutdown process includes, for example, the process of writing various historical information and various plant states to the non-volatile memory.

[0172] [5-2. Result]

As described above in the fifth electric operating machine 27 of the fifth embodiment, in the case where the controller 62 is in the low power running state, the fifth control power supply 141 enters the second conversion state, and the third converter 93 and the fourth converter 95 are not used to convert the voltage into fifth control power supply 141. Thus, the power consumption in the third converter 93 and the fourth converter 95 can be suppressed. not only the power consumption in the controller 62, but also the power consumption in the third converter 93 and the fourth converter 95. Thus, the power consumption can be reduced when the fifth electric work machine 27 is not in use.

[0173] Also, the fifth electric work machine 27 uses a multi-output power supply 102 that has multiple battery packs as a power source. Thus, compared to a configuration using a single battery pack, increased output work is possible based on the increased voltage. The multiple output power supply 102 can increase the maximum voltage that can be output according to the number of battery packs by using a multiple battery pack configuration.

[0174] In the fifth electrical work machine 27, the second converter 71 is not connected to the first voltage output means 102a with the largest output voltage, but is connected to the second voltage output means 102b with the smallest output voltage. In other words, the second converter 71 is not configured to convert the first battery voltage VB1 (VB1=72V) to a constant voltage Vcc (Vcc=5V), but is configured to convert the second battery voltage VB2 (VB2=36V) to a constant voltage Vcc.

[0175] This allows the second converter 71 to reduce the change in voltage when the voltage is converted in the second converter 71 compared to the case of converting the voltage from the first battery voltage VB1 to the constant voltage Vcc. Because of this, the fifth electric work machine 27 can reduce the power loss due to the voltage conversion in the second converter 71 compared to the case of a large voltage change.

[0176] In the fifth electric operating machine 27, the "third converter 93 and the fourth converter 95" (corresponding to one example of the first converter) are connected to the first voltage output means 102a with an output voltage (VB1=72V) that is greater than that of the second output means 102b voltage with the output voltage (VB2=36V) to which the second converter 71 is connected. As a result, the electric power that can be output from the "third converter 93 and the fourth converter 95" is larger than the electric power that can be output from the second converter 71. The "third converter 93 and fourth converter 95" can supply sufficient power to the controller 62 compared to the second converter 71.

[0177] [5-3. Conformity of concepts]

The multiple output power supply 102 corresponds to one example of the power supply, and the third converter 93 and the fourth converter 95 correspond to one example of the first converter.

[0178] [6. Sixth Embodiment]

As the sixth embodiment, the sixth electric work machine 29 made by replacing some components of the third electric work machine 23 in the third embodiment will be described.

[0179] As shown in FIG. 11, the sixth electric work machine 29 includes a sixth control power supply 151 and a multi-output power supply 102 instead of the third control power supply 111 and battery pack 100 of the third electric work machine 23, respectively.

[0180] The multiple output power supply 102 in the sixth embodiment has exactly the same configuration as that in the fifth embodiment, and thus will not be further described.

[6-1. Sixth control power supply]

The sixth control power supply 151 converts the first battery voltage VB1 or the second battery voltage VB2 into a constant voltage Vcc, and outputs the constant voltage Vcc (Vcc=5V) to the constant voltage supply line 81.

[0181] The sixth control power supply 151 is configured as the third control power supply 111 to which the fourth switch 153 and the fifth switch 155 are added, and in which the connection destination of the shunt current path LC4 is changed. The following description mainly describes the difference between the third control power supply 111 and the sixth control power supply 151.

[0182] The first end of the shunt current path LC4 is connected to the second voltage output means 102b of the multi-output power supply 102. The second end of the shunt current path LC4 is connected to the fifth node P5 and the first end of the common current path LC5.

[0183] A fourth switch 153 and a fifth switch 155 are provided in a shunt current path LC4 between the shunt current detection means 115 and the second voltage output means 102b of the multi-output power supply 102. Each of the fourth switch 153 and the fifth switch 155 includes a switch (such as a FET) connected in series with the shunt current path LC4.

[0184] The fourth switch 153 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state) based on the first interrupt command signal Sb1 from the first battery pack 103. The fifth switch 155 is configured to switch the switch to a conductive state (ON state) or a non-conductive state (OFF state) based on the second interrupt command signal Sb2 from the second battery pack 104.

[0185] The fourth switch 153 and the fifth switch 155 are configured to switch the electrical conduction in the shunt current path LC4 from the second voltage output means 102b to the fourth converter 95 via the shunt current detecting means 115 to a conductive state or a non-conductive state. This allows the fourth switch 153 and the fifth switch 155 to switch to the state of inputting the second battery voltage VB2 to the fourth converter 95 through the shunt current determination means 115 based on the first interrupt command signal Sb1 and the second interrupt command signal Sb2.

[0186] The third converter 93 is provided with a DC-DC converter that converts the DC voltage and outputs the converted voltage. The third converter 93 converts the first battery voltage VB1 (VB1=72V), which is inputted by the input device 93a, into the second constant voltage Vdd, and outputs the second constant voltage Vdd through the output means 93b. The third converter 93 outputs 15V as the second constant voltage Vdd. The third converter 93 has a maximum output current of 150mA for voltage conversion.

[0187] In the sixth control power supply 151, which is configured as described above, when the first current notification signal Sia1 is output from the current detection means 119 to the operation state determination means 75, the conduction command signal Sc1 indicating the control operation state is outputted from the operation state determination means 75 to the first switch 67, and the voltage conversion is executed by the third converter 93. At this time, the sixth control power supply 151 converts the first battery voltage VB1 into a constant voltage Vcc using the third converter 93 and the fourth converter 95, and outputs the constant voltage Vcc, thereby moving to a state for supplying control power to the controller 62 (hereinafter, the first conversion state).

[0188] Also in the sixth control power supply 151, when the second current notification signal Sia2 is output from the current detecting means 119 to the working state determining means 75, the conduction command signal Sc1 indicating the low-power working state is outputted from the working state determining means 75 to the first switch 67, and the voltage conversion by the third converter is stopped. At this time, the sixth control power supply 151 converts the second battery voltage VB2 into a constant voltage Vcc using the fourth converter 95 and outputs the constant voltage Vcc, thereby shifting to a state for supplying control power to the controller 62 (hereinafter, the second conversion state).

[0189] In addition, the sixth control power supply 151 sets the fourth switch 153 or the fifth switch 155 to a non-conductive state based on the first interrupt command signal Sb1 from the first battery pack 103 or the second interrupt command signal Sb2 from the second battery pack 104, thereby stopping input the second battery voltage VB2 to the fourth converter 95 via the shunt current path LC4. In other words, when at least one of the first battery pack 103 and the second battery pack 104 is in a fault state, the sixth control power supply 151 is configured to stop inputting the second battery voltage VB2 to the fourth converter 95 through the shunt current path LC4, thereby stopping the output of the constant voltage Vcc by the fourth converter 95 through the shunt current path LC4.

[0190] [6-2. Result]

As described above in the sixth electric operating machine 29 of the sixth embodiment, in the case where the controller 62 is in a low power operation state, the sixth control power supply 151 enters the second conversion state, and the third converter 93 is not used to convert the voltage in the sixth power supply 151 management. Thus, power consumption in the third converter can be prevented. As a result, in a case where the operation state of the controller 62 changes from the control operation state to the low power operation state when the sixth electric operating machine 29 is not used, not only the power consumption in the controller 62 but also the power consumption in the third converter 93 can be reduced. Thus, power consumption can be reduced when the sixth electric work machine 29 is not in use.

[0191] Also, the sixth electric work machine 29 uses a multi-output power supply 102 with multiple battery packs as a power source. Thus, compared to a configuration using a single battery pack, increased output power based on increased voltage is possible.

[0192] In the sixth electric working machine 29, the fourth converter 95 is not connected to the first voltage output means 102a with the largest output voltage, but is connected to the second voltage output means 102b with the smallest output voltage. In other words, the fourth converter 95 is configured not to convert the first battery voltage VB1 (VB1=72V) to a constant voltage Vcc (Vcc=5V), but is configured to convert the second battery voltage VB2 (VB1=36V) to a constant voltage Vcc.

[0193] This allows the fourth converter 95 to reduce the change in voltage when the voltage is converted in the fourth converter 95 compared to the case of converting the voltage from the first battery voltage VB1 to the constant voltage Vcc. Because of this, the sixth electric working machine 29 can reduce the power loss due to the voltage conversion in the fourth converter 95 compared to the case of a large voltage change.

[0194] In the Sixth electrical operating machine 29, "the third converter 93 and the fourth converter 95" (corresponding to one example of the first converter) are connected to the first voltage output means 102a with a larger output voltage (VB1=72V) than the second voltage output means 102b with output voltage (VB2=36V) to which the fourth converter 95 (corresponding to one example of the second converter) is connected. As a result, the electric power that can be output from the "third converter 93 and fourth converter 95" is larger than the electric power that can be output when only the fourth converter 95 is used. The "third converter 93 and fourth converter 95" can supply sufficient power to the controller. 62 in comparison with the case in which only the fourth transducer 95 is used.

[0195] [6-3. Conformity of concepts]

The multi-output power supply 102 corresponds to one example of the power supply, "the third converter 93 and the fourth converter 95" correspond to one example of the first converter, and the fourth converter 95 separately corresponds to one example of the second converter.

[0196] [7. Other Implementations]

Embodiments of the present invention have been described above. The present invention is not limited to the above embodiments, and can be practiced in various forms without departing from the gist of the present invention.

[0197] (a) In the above third embodiment and the fourth embodiment, the status notification signal Smo that is output by the controller 62 is not used. However, as in the first embodiment and the second embodiment, the status notification signal Smo can be used. For example, in the third electric operating machine 23 of the third embodiment, the status notification signal Smo (the first status notification signal Smo1 and the second status notification signal Smo2), in addition to the current notification signal Sia that is output by the shunt current detecting means 115, may be output to the means 75 to determine the operating status. In other words, the operating state determining means 75 may be configured to receive the first status notification signal Smo1 and the second status notification signal Smo2.

[0198] This operating state determining means 75 determines that the operating state of the controller 62 is the control operating state when the shunt current Ibp is greater than the operating reference value Ith or when the first status notification signal Smo1 is received. This operation state determination means 75 determines that the operation state of the controller 62 is a low power operation state when the shunt current Ibp is equal to or less than the operation reference value Ith and the second status notification signal Smo2 is received.

[0199] In this electrical operating machine, the operating state determination means 75 may determine the operating state of the controller 62 based on the first status notification signal Smo1 and the second status notification signal Smo2, in addition to the result of comparison between the shunt current Ibp and the operation reference value Ith.

[0200] Also in the fourth electric working machine 25 of the fourth embodiment, the status notification signal Smo (the first status notification signal Smo1 and the second status notification signal Smo2) in addition to the current notification signal Sia that is output from the second current determination means 131 shunt, can be entered into the means 75 to determine the operating state.

[0201] Also, the work state determination process that is executed in the work state determination means 75 may be replaced by the work state determination process as an internal process of the controller 62. For example, the controller 62 may generate a conduct command signal Sc1 using the trigger signal Str and the notification signal Smo status and output the conduct command signal Sc1 to the first switch 67, thereby controlling the first switch 67. Alternatively, the controller 62 may be configured to receive the current notification signal Sia, generate a conduct command signal Sc1 using the trigger signal Str and the signal Sia notification of the current, and outputting the conduction command signal Sc1 to the first switch 67, thereby controlling the first switch 67.

[0202] (b) The first reverse flow suppression means 69 is not limited to the configuration provided with a switch such as a FET. Any configuration, such as a Schottky diode, can be used as long as it can prevent reverse current flow and has a low voltage drop when the current flows in the forward direction. The same applies to the second backflow suppression means 73 .

[0203] (c) In the above embodiments, the constant voltage Vcc=5V, the battery voltage VB=36V, and the second constant voltage Vdd=15V. These voltages are not limited to the above values and may be other suitable values depending on the use of the electric working machine.

As shown in FIG. 12, the multiple output power supply 102 may include three battery packs (the first battery pack 103, the second battery pack 104, and the third battery pack 105), three voltage output means (the first voltage output means 102a, the second voltage output means 102b, and the third battery 102d voltage output) and reference voltage 102c. The multiple output power supply 102 can output the first battery voltage VB1 (VB1=108V) from the first voltage output means 102a, output the third battery voltage VB3 (VB3=72V) from the third voltage output means 102d, and output the second battery voltage VB2 (VB2=36V). ) from the second voltage output means 102b.

[0204] In the above embodiments, a converter is provided that only steps down the voltage. The electric working machine of the present invention may be provided with a converter that step-ups the voltage. For example, in the second embodiment, the third converter 93 steps down the battery voltage VB to the second constant voltage Vdd. As another form, after the third converter 93 steps up the battery voltage VB (36V) to the third DC voltage Vee (eg 51V), the fifth converter (not shown) may step down the third DC voltage Vee to the second DC voltage Vdd ( 15V). The third DC voltage Vee has a higher voltage than the battery voltage VB and can be used as a high voltage side FET power supply. Also, the presence of a converter that jumps up the voltage ensures that the second constant voltage Vdd is generated even if the battery voltage VB falls below the second constant voltage Vdd (15V) due to a failure of the battery pack 100, for example.

[0205] (d) The electric work machine to which the present invention can be applied is not limited to a rechargeable impact driver, and may be, for example, an electric hammer, an electric impact drill, an electric drill, an electric screwdriver, an electric wrench, an electric reciprocating saw, an electric jigsaw, electric scissors, electric chain saw and electric planer, electric stapler, electric nailer, electric brush cutter, electric lawn mower, electric grass trimmer, electric grass shears, electric vacuum cleaner, electric fan, electric grinder, electric impact wrench, electric disc saw, electric impact driver, etc.

[0206] (e) The functions of one component in the above embodiments may be distributed to one or two components, and the functions of two or more components may be integrated in one component. At least part of the configuration of the above embodiments can be replaced by known configurations with the same function. Part of the above embodiments may be omitted. At least part of the configuration of the above embodiment may be added to or may replace the configuration of another embodiment. It should be noted that any and all principles that are embodied in the technical ideas as defined by the wording within the scope of the claims are embodiments of the present invention.

Claims (70)

1. An electrical work machine, comprising: a drive device configured to drive the power supply from the power source; a controller configured to selectively switch an operating state of the controller to one of a plurality of operating states, the multiple operating states including a control operating state and a low power operating state, wherein the controller in the control operating state is configured to control a drive device, the controller in the low power operating state is configured to consume less power than the power consumption of the controller in the control operating state; an operating state determination means, configured to determine an operating state of the controller; And a control power supply including a first converter and a second converter, wherein the first converter is configured to output the first control current based on the power supply, wherein the first control current has a maximum value corresponding to the maximum value of the current consumption of the controller in the control operating state, the second converter is configured to output the second control current based on the power supply, the second control current having a maximum value (i) less than the maximum value of the first control current and (ii) corresponding to the maximum current consumption of the controller in a low power operating state, the control power supply is configured to transition to the first conversion state in response to the operating state determining means determining that the controller is in the control operating state, the control power supply in the first conversion state being configured to supply the first control current to the controller, and the control power supply is configured to enter the second conversion state in response to the operating state determining means determining that the controller is in a low power operating state, wherein the control power supply in the second conversion state is configured to (i) stop operation of the first inverter and (ii) supplying a second drive current to the controller. 2. Electric working machine according to claim 1, in which the control power supply is configured to enter the first conversion state in response to the user operating the electrical work machine. 3. Electric working machine according to claim 1 or 2, in which the first transducer includes the first output means, and the electric working machine includes a first reverse flow suppression means configured to suppress the inflow of reverse current into the first output means. 4. Electric working machine according to claim 1, in which the control power supply includes a first current path and a second current path, the first current path is part of the current path from the power supply to the controller, the first transducer is provided in the first current path, the second current path is connected in parallel with the first current path, a second transducer is provided in the second current path, the control power supply in the first conversion state is configured to supply the first control current to the controller through the first current path, and the control power supply in the second conversion state is configured to supply the second control current to the controller via the second current path. 5. Electric working machine according to claim 4, in which the second transducer includes a second output means, and the electrical operating machine further comprises a second reverse flow suppression means provided in the second current path between the second converter and the controller, the second reverse flow suppression means being configured to suppress the inflow of reverse current into the second output means. 6. Electric working machine according to claim 5, in which the power supply is configured to output the power supply voltage, the first converter is configured to output the first control voltage based on the power supply voltage, wherein the first control voltage is lower than the power supply voltage, and the second converter is configured to output a second control voltage based on the power supply voltage, wherein the second control voltage is approximately equal to the first control voltage. 7. Electric working machine according to claim 5, in which the operating state determining means is configured to receive the first status notification signal and the second status notification signal, the first status notification signal indicating that the operating state of the controller is a control operating state, the second status notification signal indicating that the operating controller state is low power working state, the operating state determining means is configured to determine that the operating state of the controller is the control operating state in response to receiving the first status notification signal, and the operating state determining means is configured to determine that the operating state of the controller is a low power operating state in response to receiving the second status notification signal. 8. Electric working machine according to claim 1, in which the control power supply includes a third current path, a shunt current path and a common current path, the third current path is part of the current path from the power supply to the controller, the first transducer is provided in the third current path, the shunt current path is connected in parallel with the third current path, for the common current path, the first end is connected to the third current path and the shunt current path, a second transducer is provided in the common current path, the power supply is configured to output the power supply voltage, the first converter is configured to convert the power supply voltage into the first control voltage, the first control voltage is lower than the power supply voltage, the second converter is configured to convert the power supply voltage or the first control voltage into the second control voltage, the second control voltage is lower than the first control voltage, the control power supply in the first conversion state is configured to (i) operate the first converter and the second converter such that the second converter converts the first control voltage to the second control voltage, and (ii) supply the second control voltage to the controller, and the control power supply in the second conversion state is configured to operate the second converter such that the second converter converts the power supply voltage into the second control voltage. 9. Electric working machine according to claim 8, in which the shunt current path is configured to receive the shunt current, the operating state determination means is configured to determine whether the value of the shunt current flowing through the shunt current path is greater than a predetermined operating reference value, the operating state determining means is configured to determine that the controller is in a control operating state in response to the shunt current value being greater than the operating reference value, and the operating state determining means is configured to determine that the controller is in a low power operating state in response to the shunt current value being equal to or less than the operating reference value. 10. Electric working machine according to claim 9, in which the operating state determining means is configured to receive the first status notification signal and the second status notification signal, the first status notification signal indicating that the operating state of the controller is a control operating state, the second status notification signal indicating that the operating controller state is low power working state, the operating state determining means is configured to determine that the controller is in the control operating state in response to the shunt current value being greater than the operating reference value, or in response to receiving the first status notification signal, and the operating state determining means is configured to determine that the operating state of the controller is a low power operating state (i) in response to the shunt current value being equal to or lower than the operating reference value, and (ii) in response to receiving the second notification signal about the state. 11. Electric working machine according to claim 1, in which the power supply includes a first voltage output means and a second voltage output means, the first converter is connected to the first voltage output means, and the second converter is connected to the second voltage output means. 12. Electric working machine according to claim 11, in which the first voltage output means is configured to output the first output voltage, the second voltage output means is configured to output the second output voltage, and the first output voltage is higher than the second output voltage. 13. Electric working machine according to claim 12, in which the power supply further includes a third voltage output means for outputting a third output voltage, and the second output voltage is lower than the third output voltage. 14. A method for supplying power to an electric work machine controller, the method comprising: the first control current is supplied from the first converter to the controller in response to the fact that the controller is in the control operating state, the first converter is configured to output the first control current based on the power supply of the electric working machine, the first control current has a maximum value corresponding to the maximum the value of the consumed current of the controller in the control operating state; And a second drive current is supplied from the second converter to the controller in response to the controller being in a low power operating state, the second converter being configured to output the second drive current based on the power supply, the second drive current having a maximum value (i) less than the maximum value of the first drive current and (ii) corresponding to the maximum current draw of the controller in the low power operating state.

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