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Electric Working Machine, and Method for Supplying Electric Power to Controller of Electric Working Machine
| Content Provider | The Lens |
|---|---|
| Abstract | An electric working machine in one aspect of the present disclosure includes a driving device, a controller, a control power source, and an operation state determiner. The control power source includes a first converter and a second converter. The control power source transitions to a first conversion state when the operation state determiner determines that the controller is in a control operation state. The control power source in the first conversion state supplies a first control current to the controller. The control power source transitions to a second conversion state when the operation state determiner determines that the controller is in a low power operation state. The control power source in the second conversion state (i) stops operation of the first converter, and (ii) supplies a second control current to the controller. |
| Related Links | https://www.lens.org/lens/patent/117-024-486-676-843/frontpage |
| Language | English |
| Publisher Date | 2021-12-23 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Jurisdiction | United States of America |
| Date Applied | 2021-08-31 |
| Applicant | Makita Corp |
| Application No. | 202117462820 |
| Claim | An electric working machine comprising: a first battery pack including a first positive electrode and a first negative electrode, the first battery pack having a first pack voltage; a first battery port configured to be detachably attached to the first battery pack; a second battery pack including a second positive electrode and a second negative electrode, the second battery pack having a second pack voltage; a second battery port configured to be detachably attached to the second battery pack, the second battery port being coupled to the first battery port so as to electrically couple the second negative electrode to the first positive electrode; a first voltage outputter electrically coupled to the second battery port, the first voltage outputter being configured to output a voltage sum, the voltage sum corresponding to a sum of the first pack voltage and the second pack voltage; a second voltage outputter electrically coupled to the first battery port, the second voltage outputter being configured to output the first pack voltage; a motor configured to be driven upon receipt of the voltage sum; a trigger configured to be turned ON or OFF by a user of the electric working machine; a controller configured to (i) switch to a control operation state in response to the trigger being turned ON, and (ii) switch to a low power operation state in response to the trigger being turned OFF, the controller in the control operation state being configured to control the motor, and the controller in the low power operation state being configured to consume electric power smaller than electric power consumed in the controller in the control operation state; and a control power source including: a first current path included in a current path from the first battery port and the second battery port to the controller; a second current path coupled in parallel to the first current path; a first converter provided on the first current path, the first converter being configured to output a first control current upon receipt of the voltage sum, the first control current having a first maximum value, and the first maximum value corresponding to a maximum value of consumed current in the controller in the control operation state; and a second converter provided on the second current path, the second converter being configured to output a second control current upon receipt of the first pack voltage, the second control current having a second maximum value, and the second maximum value (i) being smaller than the first maximum value and (ii) corresponding to a maximum value of consumed current in the controller in the low power operation state, the control power source being configured to switch to a first conversion state or to a second conversion state, the control power source in the first conversion state being configured to supply the first control current to the controller via the first converter, and the control power source in the second conversion state being configured to supply the second control current to the controller via the second converter. An electric working machine comprising: a driving device configured to be driven with power-supply power outputted from a power source, the power source including a first voltage outputter and a second voltage outputter, the first voltage outputter being configured to output a first output voltage, the second voltage outputter being configured to output a second output voltage, and the first output voltage being higher than the second output voltage; a controller configured to selectively switch to a control operation state or a low power operation state, the controller in the control operation state being configured to control the driving device, and the controller in the low power operation state being configured to consume electric power smaller than electric power consumed in the controller in the control operation state; and a control power source including: a first converter coupled to the first voltage outputter, the first converter being configured to output a first control current based on the power-supply power, the first control current having a first maximum value, and the first maximum value corresponding to a maximum value of consumed current in the controller in the control operation state; and a second converter coupled to the second voltage outputter, the second converter being configured to output a second control current based on the power-supply power, the second control current having a second maximum value, and the second maximum value (i) being smaller than the first maximum value and (ii) corresponding to a maximum value of consumed current in the controller in the low power operation state, the control power source being configured to switch to either a first conversion state or a second conversion state, the control power source in the first conversion state being configured to supply the first control current to the controller via the first converter, and the control power source in the second conversion state being configured to supply the second control current to the controller via the second converter. The electric working machine according to claim 2, wherein the control power source further includes: a first power supply switcher configured to (i) switch to a first supply permission state in response to the control power source being in the first conversion state, and (ii) switch to a first supply stop state in response to the control power source being in the second conversion state, the first supply permission state corresponding to a state where the first power supply switcher permits supply of the power-supply power to the first converter, and the first supply stop state corresponding to a state where the first power supply switcher stops supply of the power-supply power to the first converter; and a second power supply switcher configured to (i) switch to a second supply stop state in response to the control power source being in the first conversion state, and (ii) switch to a second supply permission state in response to the control power source being in the second conversion state, the second supply permission state corresponding to a state where the second power supply switcher permits supply of the power-supply power to the second converter, and the second supply stop state corresponding to a state where the second power supply switcher stops supply of the power-supply power to the second converter. The electric working machine according to claim 3, wherein the control power source further includes: a first current path included in a current path from the power source to the controller; and a second current path coupled in parallel to the first current path, and the second power supply switcher includes: a first switcher provided on the second current path, the first switcher being configured to complete or break the second current path; and a second switcher provided on the second current path, the second switcher being coupled in series to the first switcher, and the second switcher being configured to complete or break the second current path. The electric working machine according to claim 3, wherein the second power supply switcher is configured to receive a failure notification signal, and the second power supply switcher is further configured to switch to the second supply stop state in response to the second power supply switcher receiving or having received the failure notification signal, the failure notification signal notifying that the power source is in a faulty state. The electric working machine according to claim 5, wherein the power source is configured to output the failure notification signa The electric working machine according to claim 2, wherein the power source further includes a first battery pack and a second battery pack, the first output voltage corresponds to a sum of (i) an output voltage of the first battery pack and (ii) an output voltage of the second battery pack, and the second output voltage corresponds to an output voltage of the first battery pack. The electric working machine according to claim 2, wherein the power source further includes a third voltage outputter configured to output a third output voltage, and the second output voltage is lower than the third output voltage. The electric working machine according to claim 2, wherein the control power source is configured to transition to the first conversion state in response to a user of the electric working machine manipulating the electric working machine. The electric working machine according to claim 2, wherein the first converter includes a first outputter, and the electric working machine includes a first reverse flow suppressor connected to the first outputter, the first reverse flow suppressor being configured to suppress inflow of reverse current to the first outputter. The electric working machine according to claim 3, wherein the control power source includes: a first current path included in a current path from the power source to the controller; and a second current path coupled in parallel to the first current path, the first converter is provided on the first current path, the second converter is provided on the second current path, the control power source in the first conversion state is configured to supply the first control current to the controller via the first current path, and the control power source in the second conversion state is configured to supply the second control current to the controller via the second current path. The electric working machine according to claim 11, wherein the second power supply switcher includes first and second switches provided on the second current path and coupled in series to each other, the first and second switches being configured to complete or break the second current path. The electric working machine according to claim 11, wherein the second converter includes a second outputter, and the electric working machine further includes a second reverse flow suppressor provided between the second converter and the controller on the second current path, the second reverse flow suppressor (i) being coupled to the second outputter and (ii) being configured to suppress inflow of reverse current to the second outputter. The electric working machine according to claim 11, wherein the power-supply power has a power-supply voltage, the first converter is configured to output a first control voltage based on the power-supply voltage, the first control voltage being lower than the power-supply voltage, and the second converter is configured to output a second control voltage based on the power-supply voltage, the second control voltage being approximately equal to the first control voltage. The electric working machine according to claim 11, further comprising: an operation state determiner configured to receive a first state notification signal and a second state notification signal, the first state notification signal indicating that the operation state of the controller is the control operation state, the second state notification signal indicating that the operation state of the controller is the low power operation state, the operation state determiner being configured to determine that the operation state of the controller is the control operation state in response to the operation state determiner receiving or having received the first state notification signal, and the operation state determiner being configured to determine that the operation state of the controller is the low power operation state in response to the operation state determiner receiving or having received the second state notification signa The electric working machine according to claim 2, wherein the control power source further includes: a third current path included in a current path from the power source to the controller; a bypass current path coupled in parallel to the third current path; and a common current path coupled to the third current path and to the bypass current path, the first converter is provided on the third current path, the second converter is provided on the common current path, the power-supply power has a power-supply voltage, the first converter is configured to convert the power-supply voltage to a 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 a second control voltage, the second control voltage is lower than the first control voltage, the control power source in the first conversion state is configured to (i) operate the first converter and the second converter so that the second converter converts the first control voltage into the second control voltage, and (ii) supply the second control voltage to the controller, and the control power source in the second conversion state is configured to operate the second converter so that the second converter converts the power-supply voltage into the second control voltage. The electric working machine according to claim 16, wherein the bypass current path is configured to receive a bypass current, the bypass current corresponding to part of a current flowing from the power source to the common current path, the electric working machine further includes: an operation state determiner configured to determine whether a magnitude of the bypass current flowing through the bypass current path is larger than a predetermined criterion, the predetermined criterion corresponding to a determination value for determining whether the controller is in the control operation state, and the operation state determiner being configured to (i) determine that the controller is in the control operation state in response to the magnitude of the bypass current being larger than the predetermined criterion, and (ii) determine that the controller is in the low power operation state in response to the magnitude of the bypass current being equal to or smaller than the predetermined criterion. The electric working machine according to claim 17, wherein the operation state determiner is configured to receive a first state notification signal and a second state notification signal, the first state notification signal indicating that the operation state of the controller is the control operation state, and the second state notification signal indicating that the operation state of the controller is the low power operation state, the operation state determiner is further configured to determine that the controller is in the control operation state (i) in response to the magnitude of the bypass current being larger than the predetermined criterion or (ii) in response to the operation state determiner having received the first state notification signal, and the operation state determiner is further configured to determine that the controller is in the low power operation state in response to (i) the magnitude of the bypass current being equal to or smaller than the predetermined criterion and (ii) the operation state determiner having received the second state notification signa The electric working machine according to claim 2, wherein the control power source further includes: a first power supply switcher configured to switch to either a supply permission state or a supply stop state, the first power supply switcher in the supply permission state being configured to supply the power-supply power to the first converter, and the first power supply switcher in the supply stop state being configured to stop supply of the power-supply power to the first converter; and a second power supply switcher configured to switch to either the supply permission state or the supply stop state, the second power supply switcher in the supply permission state being configured to supply the power-supply power to the second converter, and the second power supply switcher in the supply stop state being configured to stop supply of the power-supply power to the second converter, the control power source in the first conversion state is configured such that the first power supply switcher and the second power supply switcher switch so that (i) a supply state of the power-supply power to the first converter is set to the supply permission state and (ii) a supply state of the power-supply power to the second converter is set to the supply stop state, and the control power source in the second conversion state is configured such that the first power supply switcher and the second power supply switcher switch so that (i) the supply state of the power-supply power to the first converter is set to the supply stop state and (ii) the supply state of the power-supply power to the second converter is set to the supply permission state. A method for supplying electric power to a controller of an electric working machine, the method comprising: applying a first output voltage outputted from a power source to a first converter; supplying a first control current from the first converter to the controller based on electric power of the power source in response to the controller being in a control operation state, the first control current having a first maximum value, and the first maximum value corresponding to a maximum value of consumed current in the controller in the control operation state; applying a second output voltage outputted from the power source to a second converter, the second output voltage being lower than the first output voltage; and supplying a second control current from the second converter to the controller based on the electric power of the power source in response to the controller being in a low power operation state, the second control current having a second maximum value, and the second maximum value (i) being smaller than the first maximum value and (ii) corresponding to a maximum value of consumed current in the controller in the low power operation state. |
| CPC Classification | CONTROL OR REGULATING SYSTEMS IN GENERAL;FUNCTIONAL ELEMENTS OF SUCH SYSTEMS;MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS CONTROL OR REGULATION OF ELECTRIC MOTORS; ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS;CONTROLLING TRANSFORMERS; REACTORS OR CHOKE COILS TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR; FOR FASTENING; CONNECTING; DISENGAGING OR HOLDING COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR;DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR |
| Extended Family | 126-537-504-007-564 164-092-865-741-202 073-624-946-991-196 092-978-134-860-091 172-632-575-434-962 084-236-229-660-014 081-505-532-710-284 117-024-486-676-843 117-052-858-299-371 066-119-762-184-882 |
| Patent ID | 20210399668 |
| Inventor/Author | Suzuki Hitoshi Nakamoto Akihiro |
| IPC | H02P27/06 B25F5/02 |
| Status | Active |
| Simple Family | 117-052-858-299-371 081-505-532-710-284 126-537-504-007-564 164-092-865-741-202 117-024-486-676-843 073-624-946-991-196 |
| CPC (with Group) | G05B11/01 H02P27/06 B25B21/02 B25F5/02 |
| Issuing Authority | United States Patent and Trademark Office (USPTO) |
| Kind | Patent Application Publication |
