Standby low-power-consumption power supply control device for direct-current brushless motor

Abstract

The utility model provides a standby low-power-consumption power supply control device for a direct current brushless motor. The standby low-power-consumption power supply control device comprises a first power supply converter, a second power supply converter, a motor controller, a single-chip microcomputer, a gate driver, a power supply control circuit and a brushless motor. The first power converter is connected with an external battery, the second power converter is connected with the first power converter, the single-chip microcomputer is connected with the gate driver, the power control circuit is located between the first power converter and the external battery, and the motor controller is connected with the power control circuit and controls use of a power supply. According to the standby low-power-consumption power supply control device for the direct-current brushless motor provided by the utility model, the motor controller is additionally arranged to provide a control instruction for a use circuit of the whole motor, then the power supply control circuit is utilized to control the output of the battery voltage, and due to the leakage-proof performance of the MOS tube, the standby low-power-consumption power supply control device can be applied to the direct-current brushless motor. And the leakage current can be minimized on the premise that conduction cannot be carried out, so that the standby loss of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to a standby low-power consumption power supply control device for a DC brushless motor. Background Art

[0002] In the traditional brushless DC motor (BLDC), the overall circuit principle block diagram of the motor is shown in Figure 1. The battery voltage output B+ / B- is connected to the (LDO12V) power conversion, converted to 12V and then converted to 5V through the (LDO5V) power conversion to supply power to the MCU. The MCU receives external signals and motor data processing, outputs the gate drive circuit, and drives the six-way H-bridge MOS tube to make the brushless motor run and stop.

[0003] When the EN signal of the motor control (EN) is high and the motor has no faults, the motor runs; when the EN signal is low, the motor stops. Whether the motor is running or stopped, the (LDO12V) power conversion, (LDO5V) power conversion, and (MCU) microcontroller will be in standby state, so they will consume a certain amount of power, usually at the mA level. When powered by a battery module, this level of standby power consumption will seriously affect the battery's standby time.

[0004] Therefore, traditional brushless motors require continuous power supply from the circuit during use, and the battery is in standby mode at this time. The smaller the power consumption, the longer the standby time of the battery and the longer the battery life. Utility Model Content

[0005] The utility model aims to provide a low-power standby power supply control device for a brushless DC motor. By designing the power supply control device and connecting a power supply control circuit in series with a power supply circuit, the energy consumption of the motor can be reduced during standby.

[0006] In order to solve the above problems, the utility model provides a low-power standby power supply control device for a brushless DC motor, which adopts the following technical solutions:

[0007] A standby low-power power control device for a brushless DC motor comprises a first power converter, a second power converter, a motor controller, a single-chip microcomputer, a gate driver, a power control circuit and a brushless motor; the first power converter is connected to an external battery to perform a first conversion on the power voltage; the second power converter is connected to the first power converter to perform a second conversion on the power voltage to provide power for the single-chip microcomputer and the gate driver; the single-chip microcomputer is connected to the gate driver to control the brushless motor; the power control circuit is located between the first power converter and the external battery to control the output of the power; the motor controller is connected to the power control circuit to output a signal to the power control circuit to control the use of the power;

[0008] The power control circuit includes a triode and a MOS tube, the base of the triode is externally connected to a first resistor, and is connected to a motor controller through the first resistor; the collector of the triode is externally connected to a second resistor, and is connected to a gate on the MOS tube through the second resistor; the second resistor is simultaneously connected to a third resistor, one end of the third resistor is connected to the triode in parallel with the gate of the MOS tube, and the other end is connected to the positive terminal of an external battery in parallel with the source of the MOS tube; the drain of the MOS tube is externally connected to the first power converter.

[0009] Furthermore, the first power converter converts the battery voltage into a 12V voltage.

[0010] Furthermore, the second power converter converts the input voltage from 12V to 5V.

[0011] Furthermore, the motor controller is connected to the input end of the power control circuit and outputs a control signal. A high level causes the motor to run, and a low level causes the motor to stop.

[0012] Furthermore, when the motor controller receives a shutdown or standby command, it outputs an EN signal to the power control circuit. At this time, the EN signal is at a low level, and the transistor cuts off the current, so the collector of the transistor cannot output current to the outside. At this time, no current flows through the second resistor and the third resistor, so there is no voltage input on the MOS tube, and the battery voltage cannot be output to the working motor. At this point, the motor does not run, and only the leakage current in the MOS tube exists in the power control circuit, which does not exceed 10uA.

[0013] Furthermore, when the motor controller receives a working instruction, it outputs an EN signal to the power control circuit. At this time, the EN signal is at a high level, thereby turning on the transistor, allowing current to flow through the second resistor and the third resistor, thereby turning on the MOS tube to achieve voltage output.

[0014] The beneficial effect of the utility model is that the utility model provides a low-power standby power supply control device for a brushless DC motor, which provides control instructions to the entire motor use circuit by adding a motor controller, and then uses the power supply control circuit to control the output of the battery voltage. Due to the leakage-proof performance of the MOS tube, the leakage current can be minimized under the premise that it cannot be turned on, thereby reducing the loss of the motor when it is in standby mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 This is a schematic diagram of the motor circuit structure of the prior art of the utility model.

[0016] Attached Figure 2 This is a schematic diagram of the motor circuit structure of the utility model.

[0017] Attached Figure 3 It is a schematic diagram of the power control circuit of the utility model.

[0018] Among them: 1. first power converter, 2. second power converter, 3. motor controller, 4. single chip microcomputer, 5. gate drive, 6. power control circuit, 7. brushless motor, 8. transistor, 9. MOS tube, 10. first resistor, 11. second resistor, 12. third resistor. DETAILED DESCRIPTION

[0019] In order to more clearly understand the technical solution provided by the utility model, the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] As shown in the accompanying drawings, the utility model provides a standby low-power power control device for a brushless DC motor, comprising a first power converter 1, a second power converter 2, a motor controller 3, a single-chip microcomputer 4, a gate driver 5, a power control circuit 6 and a brushless motor 7; the first power converter 1 is connected to an external battery to perform a first conversion on the power voltage; the second power converter 2 is connected to the first power converter 1 to perform a second conversion on the power voltage to provide power for the single-chip microcomputer 4 and the gate driver 5; the single-chip microcomputer 4 is connected to the gate driver 5 to control the brushless motor 7; the power control circuit 6 is located between the first power converter 1 and the external battery to control the output of the power supply; the motor controller 3 is connected to the power control circuit 6 to output a signal to the power control circuit 6 to control the use of the power supply;

[0021] The power control circuit 6 includes a transistor 8 and a MOS tube 9, the base of the transistor 8 is externally connected to a first resistor 10, and is connected to a motor controller 3 through the first resistor 10; the collector of the transistor 8 is externally connected to a second resistor 11, and is connected to a gate of the MOS tube 9 through the second resistor 11; the second resistor 11 is also connected to a third resistor 12, one end of the third resistor 12 is connected to the transistor 8 in parallel with the gate of the MOS tube 9, and the other end is connected to the positive terminal of an external battery in parallel with the source of the MOS tube 9; the drain of the MOS tube 9 is externally connected to the first power converter 1.

[0022] Furthermore, the first power converter 1 converts the battery voltage into a 12V voltage.

[0023] Furthermore, the second power converter 2 converts the input voltage from 12V to 5V.

[0024] Furthermore, the motor controller 3 is connected to the input end of the power control circuit 6 and outputs a control signal. A high level causes the motor to run, and a low level causes the motor to stop.

[0025] Furthermore, when the motor controller 3 receives a shutdown or standby command, it outputs an EN signal to the power control circuit 6. At this time, the EN signal is at a low level, and the transistor 8 cuts off the current. Therefore, the collector of the transistor 8 cannot output current to the outside. At this time, no current flows through the second resistor 11 and the third resistor 12, so there is no voltage input on the MOS tube 9, and the battery voltage cannot be output to the working motor. At this point, the motor does not run, and there is only leakage current in the MOS tube 9 on the power control circuit 6, which does not exceed 10uA.

[0026] Furthermore, when the motor controller 3 receives a working instruction, it outputs an EN signal to the power control circuit 6. At this time, the EN signal is at a high level, thereby turning on the transistor 8, and current flows through the second resistor 11 and the third resistor 12, thereby turning on the MOS tube 9 to achieve voltage output.

Claims

1. A low-power standby power supply control device for a brushless DC motor, characterized in that: It includes a first power converter, a second power converter, a motor controller, a single chip microcomputer, a gate driver, a power control circuit and a brushless motor; the first power converter is connected to an external battery to perform a first conversion on the power voltage; the second power converter is connected to the first power converter to perform a second conversion on the power voltage to provide power for the single chip microcomputer and the gate driver; The single chip microcomputer is connected to the gate driver and is used to control the brushless motor; the power control circuit is located between the first power converter and the external battery and is used to control the output of the power supply; the motor controller is connected to the power control circuit and outputs a signal to the power control circuit to control the use of the power supply; The power control circuit includes a triode and a MOS tube, the base of the triode is externally connected to a first resistor, and is connected to a motor controller through the first resistor; the collector of the triode is externally connected to a second resistor, and is connected to a gate on the MOS tube through the second resistor; the second resistor is simultaneously connected to a third resistor, one end of the third resistor is connected to the triode in parallel with the gate of the MOS tube, and the other end is connected to the positive terminal of an external battery in parallel with the source of the MOS tube; the drain of the MOS tube is externally connected to the first power converter.

2. A low-power standby power supply control device for a brushless DC motor according to claim 1, characterized in that: The first power converter converts the battery voltage into a 12V voltage.

3. A low-power standby power supply control device for a brushless DC motor according to claim 1, characterized in that: The second power converter converts the input voltage from 12V to 5V.

4. A low-power standby power supply control device for a brushless DC motor according to claim 1, characterized in that: The motor controller is connected to the input end of the power control circuit and outputs a control signal. A high level causes the motor to run, and a low level causes the motor to stop.

5. A low-power standby power supply control device for a brushless DC motor according to claim 4, characterized in that: When the motor controller receives a shutdown or standby command, it outputs an EN signal to the power control circuit. At this time, the EN signal is at a low level, and the transistor cuts off the current, so the collector of the transistor cannot output current to the outside. At this time, no current flows through the second resistor and the third resistor, so there is no voltage input on the MOS tube, and the battery voltage cannot be output to the working motor. At this point, the motor does not run, and only the leakage current in the MOS tube exists in the power control circuit, which does not exceed 10uA.

6. A low-power standby power supply control device for a brushless DC motor according to claim 4, characterized in that: When the motor controller receives a working instruction, it outputs an EN signal to the power control circuit. At this time, the EN signal is at a high level, thereby turning on the transistor, causing current to flow through the second resistor and the third resistor, thereby turning on the MOS tube to achieve voltage output.

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