High-safety energy-saving battery drive circuit with motor

Abstract

The utility model belongs to the technical field of motor drive circuits, and particularly relates to a high-safety battery drive circuit with an energy-saving motor, which is provided with a motor control unit, a motor drive unit and an energy recovery unit. The energy recovery unit can convert electric energy generated due to induced electromotive force into electric energy for charging the battery during the period from power failure to shutdown of the motor to store the electric energy, and the cruising ability of the battery module is increased by converting released energy into useful energy to be supplied to the battery module. Besides, through the arrangement of the first electronic switch and the second electronic switch, only when the two electronic switches are switched on simultaneously, the motor can work, the dual-protection circuit is suitable for the use requirement of dual protection on the motor, the safety is improved, the dual-protection requirement and the energy-saving requirement are combined by the circuit, and two functions are realized while only few components are added.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor drive circuits, and in particular relates to a battery-type drive circuit with high safety and energy saving for a motor. Background Art

[0002] Many portable products with batteries contain inductive loads, such as drive motors. When the motor is turned off, it will generate an induced electromotive force. In many cases, in order to prevent the electromotive force from breaking down the MOS or transistor, the industry routinely adds a freewheeling diode to directly release this energy. Figure 1 As shown, Figure 1 It is an existing motor circuit, in which a diode is connected between the positive and negative poles of the motor MOT for freewheeling. The energy directly released by the diode is wasted, especially for motors controlled by PWM modulation, which wastes more energy. Utility Model Content

[0003] The utility model aims to provide a battery-type drive circuit with high safety and motor energy saving, so that the energy generated during the power-off and stop process of the motor can be stored in the battery, and the motor can be doubly protected to increase safety.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A battery drive circuit with high safety and motor energy saving is provided, comprising a motor control unit, a motor drive unit and an energy recovery unit, wherein the motor drive unit comprises a first electronic switch for electrically connecting between the positive pole of the battery module and the motor input terminal, and a second electronic switch for electrically connecting between the negative pole of the battery module and the motor output terminal, and the motor control unit is used to control the opening and closing of the first electronic switch and the second electronic switch; the energy recovery unit comprises a first diode for electrically connecting between the negative pole of the battery module and the motor input terminal, and a second diode for electrically connecting between the positive pole of the battery module and the motor output terminal, the negative pole of the first diode is electrically connected to the motor input terminal, and the positive pole of the second diode is electrically connected to the motor output terminal.

[0006] Preferably, the first electronic switch is a PMOS, and the second electronic switch is an NMOS.

[0007] Preferably, the motor control unit includes a voltage divider module and a controller, the voltage divider module includes a first voltage divider resistor, a second voltage divider resistor, and a third electronic switch connected in series between the positive pole of the battery module and the ground terminal, the gate of the first electronic switch is electrically connected between the first voltage divider resistor and the second voltage divider resistor, the control end of the third electronic switch is electrically connected to the first control pin of the controller, and the gate of the second electronic switch is electrically connected to the second control pin of the controller.

[0008] Preferably, a first current-limiting resistor is provided between the control end of the third electronic switch and the first control pin of the controller, and a second current-limiting resistor is provided between the gate of the second electronic switch and the second control pin of the controller.

[0009] Preferably, the control terminal of the third electronic switch is electrically connected to a first pull-down resistor, and the gate of the second electronic switch is electrically connected to a second pull-down resistor.

[0010] Preferably, the third electronic switch is a triode.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This highly secure and energy-saving battery-type drive circuit is equipped with a motor control unit, a motor drive unit, and an energy recovery unit. The energy recovery unit can convert the electrical energy generated by the induced electromotive force during the period from motor power failure to shutdown into electrical energy for charging the battery and store it. By converting the released energy into useful energy for the battery module, the battery module's endurance is increased. In addition, by providing a first electronic switch and a second electronic switch, the motor will only operate when both electronic switches are turned on simultaneously, which is suitable for use cases requiring dual protection of the motor and increases safety. This circuit combines the dual protection requirements with the energy-saving requirements, achieving both functions while adding only a few components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 2 is a circuit schematic diagram of an existing motor drive circuit.

[0014] Figure 2 This is a circuit schematic diagram of an embodiment of a battery-type drive circuit with a motor that is highly safe and energy-saving according to the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In one embodiment, a battery-type drive circuit with high safety and energy saving of a motor is provided, such as Figure 2 As shown, the battery-type drive circuit with high safety and motor energy saving includes a motor control unit, a motor drive unit and an energy recovery unit, wherein the motor control unit is used to provide a control signal, the motor drive unit is used to provide a working voltage for the motor based on the control signal of the motor control unit, and the energy recovery unit is used to recover the electric energy generated by the induced electromotive force in the motor coil during the period from power off to shutdown of the motor.

[0017] like Figure 2 As shown, the motor drive unit includes a first electronic switch Q1 for electrically connecting between the positive terminal of the battery module BAT and the input terminal of the motor MOT, and a second electronic switch Q2 for electrically connecting between the negative terminal of the battery module BAT and the output terminal of the motor MOT. The motor control unit is used to control the opening and closing of the first electronic switch Q1 and the second electronic switch Q2. The input terminal and output terminal of the motor MOT here represent different terminals depending on the direction of rotation of the motor. By providing the first electronic switch Q1 and the second electronic switch Q2 at the input terminal and output terminal of the motor MOT, respectively, dual switching control improves safety during motor control and facilitates energy recovery.

[0018] The energy recovery unit includes a first diode D1 for electrically connecting between the negative electrode of the battery module BAT and the input terminal of the motor MOT, and a second diode D2 for electrically connecting between the positive electrode of the battery module BAT and the output terminal of the motor MOT. The negative electrode of the first diode D1 is electrically connected to the input terminal of the motor MOT, and the positive electrode of the second diode D2 is electrically connected to the output terminal of the motor MOT, ensuring that the electric energy generated by the motor coil due to the induced electromotive force can flow to the battery module BAT during the period from power off to shutdown of the motor MOT. The battery module BAT here includes a battery module and a battery charge and discharge management circuit. Because the electric energy generated by the motor coil due to the induced electromotive force is unstable, the charge and discharge management circuit needs to be controlled to ensure that the charging voltage entering the battery module is within a set range.

[0019] Furthermore, in another embodiment, Figure 2As shown, in this highly secure and energy-saving battery-powered motor drive circuit, the first electronic switch Q1 is a PMOS, and the second electronic switch Q2 is an NMOS. This is because PMOS is suitable for use on the high-voltage side, while NMOS is suitable for use on the low-voltage side. In other embodiments, the first and second electronic switches can also be IGBTs, depending on requirements.

[0020] Furthermore, in another embodiment, Figure 2 As shown, the motor control unit of this highly secure and energy-saving battery-based drive circuit includes a voltage divider module and a controller MCU. The controller MCU can be a single-chip microcomputer. The voltage divider module includes a first voltage divider resistor R6, a second voltage divider resistor R5, and a third electronic switch Q3, which are connected in series between the positive electrode of the battery module BAT and the ground terminal GND. The gate of the first electronic switch Q1 is electrically connected between the first voltage divider resistor R6 and the second voltage divider resistor R5. The positive electrode of the battery module BAT is divided by the first voltage divider resistor R6 to provide a control voltage for the gate of the first electronic switch Q1. The control terminal of the third electronic switch Q3 is electrically connected to the first control pin IO1 of the controller MCU, and the gate of the second electronic switch Q2 is electrically connected to the second control pin IO2 of the controller MUC. The third electronic switch Q3 is provided because the voltage provided by the first control pin IO1 of the controller MCU is insufficient to directly drive the first electronic switch Q1. The second electronic switch Q2 is an NMOS transistor for the low-voltage side and can be directly driven by the second control pin IO2 of the controller MUC.

[0021] Furthermore, in another embodiment, Figure 2 As shown, the third electronic switch Q3 of the battery-type drive circuit with high safety and motor energy saving is a transistor, specifically an NPN transistor. A first current-limiting resistor R1 is provided between the control end of the third electronic switch Q3 and the first control pin IO1 of the controller MCU, and a second current-limiting resistor R2 is provided between the gate of the second electronic switch Q2 and the second control pin IO2 of the controller MCU. The control end of the third electronic switch Q3 is electrically connected to a first pull-down resistor R4, and the gate of the second electronic switch Q2 is electrically connected to a second pull-down resistor R3. By providing the current-limiting resistor and the pull-down resistor, on the one hand, the IO port of the controller MUC and the electronic switch itself are protected, and on the other hand, the stability of the operation of the electronic switch is ensured.

[0022] Combine Figure 2 As shown, the battery-type drive circuit with high safety and motor energy saving works as follows: the first electronic switch Q1, the motor MOT and the second electronic switch Q2 are connected in series. When the first electronic switch Q1 and the second electronic switch Q2 are turned on at the same time, the motor MOT starts, and the two switches dual-control the motor, thereby increasing the safety performance of the motor.

[0023] When the first electronic switch Q1 and the second electronic switch Q2 are turned off simultaneously, the motor MOT generates a back EMF with a negative top and a positive bottom. This back EMF flows from point B through the second diode D2 and the first diode D1 to point A to charge the battery module BAT. From this point on, whenever the motor MOT is turned off, the battery module BAT can be charged through the second diode D2 and the first diode D1, making rational use of the back EMF that would otherwise be directly consumed. In particular, when the motor MOT is controlled by PWM speed regulation, the back EMF generated is more and more sustained, which can continuously charge the battery.

[0024] Based on the above embodiments, it can be seen that the battery-type drive circuit with higher safety and motor energy saving is provided with a motor control unit, a motor drive unit and an energy recovery unit. The energy recovery unit can convert the electric energy generated by the induced electromotive force during the period from power off to shutdown of the motor into electric energy for charging the battery and store it. By converting the released energy into useful energy for the battery module, the endurance of the battery module is increased. In addition, by setting the first electronic switch Q1 and the second electronic switch Q2, the motor will only work if the two electronic switches are turned on at the same time. It is suitable for the use requirements of dual protection of the motor and increases safety. The circuit combines the dual protection requirements and energy-saving requirements, and realizes two functions while adding only a few components.

[0025] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery-type drive circuit with high safety and energy saving of a motor, characterized in that: It includes a motor control unit, a motor drive unit and an energy recovery unit, the motor drive unit includes a first electronic switch for electrically connecting between the positive pole of the battery module and the motor input terminal, and a second electronic switch for electrically connecting between the negative pole of the battery module and the motor output terminal, and the motor control unit is used to control the opening and closing of the first electronic switch and the second electronic switch; the energy recovery unit includes a first diode for electrically connecting between the negative pole of the battery module and the motor input terminal, and a second diode for electrically connecting between the positive pole of the battery module and the motor output terminal, the negative pole of the first diode is electrically connected to the motor input terminal, and the positive pole of the second diode is electrically connected to the motor output terminal.

2. The battery-type drive circuit with high safety and energy saving of a motor according to claim 1, characterized in that: The first electronic switch is a PMOS, and the second electronic switch is an NMOS.

3. The battery-type drive circuit with high safety and energy saving of a motor according to claim 2, characterized in that: The motor control unit includes a voltage divider module and a controller. The voltage divider module includes a first voltage divider resistor, a second voltage divider resistor, and a third electronic switch connected in series between the positive electrode of the battery module and the ground terminal. The gate of the first electronic switch is electrically connected between the first voltage divider resistor and the second voltage divider resistor. The control end of the third electronic switch is electrically connected to the first control pin of the controller, and the gate of the second electronic switch is electrically connected to the second control pin of the controller.

4. The battery-type drive circuit with high safety and energy saving of a motor according to claim 3, characterized in that: A first current-limiting resistor is provided between the control end of the third electronic switch and the first control pin of the controller, and a second current-limiting resistor is provided between the gate of the second electronic switch and the second control pin of the controller.

5. The battery-type drive circuit with high safety and energy saving of a motor according to claim 4, characterized in that: The control terminal of the third electronic switch is electrically connected to a first pull-down resistor, and the gate of the second electronic switch is electrically connected to a second pull-down resistor.

6. The battery-type drive circuit with high safety and energy saving of a motor according to claim 5, characterized in that: The third electronic switch is a triode.

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