CN220022318U

CN220022318U - Small-size high performance direct current motor drive plate

Info

Publication number: CN220022318U
Application number: CN202321673166.0U
Authority: CN
Inventors: 陈华铭; 李政徽; 熊展鹏; 谷海宇
Original assignee: Harbin Zhangla Technology Co ltd
Current assignee: Harbin Zhangla Technology Co ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-11-14
Anticipated expiration: 2033-06-29

Abstract

The utility model discloses a small high-performance direct current motor driving plate, which comprises a motor direct current driving chip, a voltage spike eliminating capacitor and an overcurrent detection resistor, wherein a power input pin of the motor direct current driving chip is connected with one end of the voltage spike eliminating capacitor and the high side of an H-bridge driving circuit, the other end of the voltage spike eliminating capacitor is grounded, the low side of the H-bridge driving circuit and one input end of a voltage comparator are connected with the overcurrent detection resistor, the other input end of the voltage comparator is a reference voltage end, the output end of the voltage comparator is connected with a control logic module, the input end of a built-in dead zone protection module is connected with the H-bridge driving circuit, and the output end of the built-in dead zone protection module is connected with the control logic module. The utility model prevents the MOS tube integrated in the driving chip from bearing excessive power load, forms closed-loop control and realizes the self-protection of the voltage and the current of the chip. The built-in dead zone protection module is used for detecting the working state of the MOS tube and preventing the MOS tubes on two sides from being conducted simultaneously.

Description

Small-size high performance direct current motor drive plate

Technical Field

The utility model relates to the technical field of motor drive circuits, in particular to a small high-performance direct current motor drive plate.

Background

At present, the drive board of the direct current motor on the market has large volume, high price, weak driving capability and low conversion efficiency. The driving chip cannot carry out closed loop on the driving voltage and the driving current, can only roughly control the current direction, and is difficult to accurately control the torque and the speed of the rotation of the motor. The MOS tube integrated inside the driving chip is easy to bear excessive input voltage load due to the influence of an external power supply.

Disclosure of Invention

The utility model aims to provide a small high-performance direct current motor driving plate so as to solve the defects in the prior art.

The utility model is implemented by the following technical scheme: the utility model provides a small-size high performance direct current motor drive plate, includes motor direct current drive chip, voltage spike elimination electric capacity, overcurrent detection resistance, motor direct current drive chip includes voltage comparator, built-in dead zone protection module, control logic module, H bridge drive circuit, motor direct current drive chip's power input pin connects voltage spike elimination electric capacity one end and H bridge drive circuit's high side, voltage spike elimination electric capacity other end ground connection, H bridge drive circuit's low side and voltage comparator one input connect overcurrent detection resistance, voltage comparator another input is the benchmark voltage end, voltage comparator output connection control logic module, built-in dead zone protection module input connection H bridge drive circuit, built-in dead zone protection module output connection control logic module.

Further, the voltage spike removing capacitor is a bulk parent capacitor.

Further, the resistance value of the overcurrent detection resistor is 0.2 ohm to 1 ohm.

Furthermore, the power input port, the signal input port and the signal output port of the motor direct current driving chip are also respectively connected with a power input indicator lamp, a signal input indicator lamp and a signal output indicator lamp.

Further, the voltage comparator is an operational amplifier.

Further, the built-in dead zone protection module is an OR gate circuit.

Further, the control logic module is a micro MCU chip.

Further, the H-bridge driving circuit is a MOSFET-based H-bridge driving circuit.

The utility model has the advantages that:

1. according to the utility model, the matrix capacitor with a large capacitance value is arranged at the power input end and is used for absorbing voltage spikes caused by back electromotive force, so that the MOS tube integrated in the driving chip is prevented from bearing excessive power load.

2. And the overcurrent state is detected through the resistor to form closed loop control, so that the self-protection of the chip voltage and current is realized. Meanwhile, the built-in dead zone protection module is arranged for detecting the working state of the MOS tubes, when the MOS tubes on the upper side are detected to work simultaneously, fault signals are output to the control logic module, the control logic module controls the H-bridge driving circuit to stop working, the MOS tubes on the two sides are prevented from being conducted simultaneously, extremely large current is generated to burn out the chip, and the service life and reliability of the chip are improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic circuit diagram of a small high performance DC motor drive board according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a forward operation of a H-bridge driving circuit of a small high-performance dc motor driving board according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a reverse operation of an H-bridge driving circuit of a small high-performance dc motor driving board according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in FIG. 1, a small-sized high-performance DC motor driving board comprises a motor DC driving chip 1, a voltage spike eliminating capacitor 2 and an overcurrent detection resistor 3, wherein the motor DC driving chip 1 comprises a voltage comparator 4, a built-in dead zone protection module 5, a control logic module 6 and an H-bridge driving circuit 7, a power input pin of the motor DC driving chip 1 is connected with one end of the voltage spike eliminating capacitor 2 and the high side of the H-bridge driving circuit 7, the other end of the voltage spike eliminating capacitor 2 is grounded, the low side of the H-bridge driving circuit 7 and one input end of the voltage comparator 4 are connected with an overcurrent detection resistor 3, the other input end of the voltage comparator 4 is a reference voltage end, the output end of the voltage comparator 4 is connected with the control logic module 6, the input end of the built-in dead zone protection module 5 is connected with the H-bridge driving circuit 7, and the output end of the built-in dead zone protection module 5 is connected with the control logic module 6.

The voltage spike removing capacitor 2 is a bulk parent capacitor. The matrix capacitor with a large capacitance value is arranged at the power input end and used for absorbing voltage spike caused by back electromotive force, so that the MOS tube integrated in the driving chip is prevented from bearing overlarge Vds, and the load of the chip is reduced.

The voltage comparator 4 is an operational amplifier, a resistor with a small resistance (0.2 ohm to 1 ohm) is arranged on the low side (LSS in the figure) of the H bridge for overcurrent detection, the current driven by the motor finally passes through the sampling resistor, and the voltages at two ends of the sampling resistor are compared with Vref/10 to judge whether overcurrent exists or not. If the voltage is greater than Vref/10, the chip is disabled for self-protection in the overcurrent state

The built-in dead zone protection module 5 is an or gate circuit. As shown in fig. 1, the or gate input end is connected with the MOS transistor on the upper side of the H-bridge driving circuit, and is used for detecting the operating state of the MOS transistor, when the upper side MOS transistor is detected to operate simultaneously, the or gate outputs a fault signal to the control logic module 6, the control logic module 6 controls the H-bridge driving circuit to stop operating, so that the MOS transistor is prevented from operating in the state shown in fig. 2 and 3, the condition that the MOS transistors on two sides are simultaneously conducted is prevented from generating, and the chip is burnt by extremely large current, so that the service life and reliability of the chip are prolonged. The control logic module 6 is a micro MCU chip for discriminating high and low level signals.

The H-bridge driving circuit 7 is a MOSFET-tube-based H-bridge driving circuit. The two paths of input adopt two paths of PWM input, and the input is passed through a Schmitt trigger for buffering and filtering signals. And then logic discrimination is carried out, an H bridge formed by four MOSFET tubes is driven, and different inputs can change the current flow direction of the H bridge node so as to change the rotation direction of the direct current motor, as shown in figures 2 and 3.

In addition, the power input port, the signal input port and the signal output port of the motor direct current driving chip 1 are also respectively connected with a power input indicator lamp, a signal input indicator lamp and a signal output indicator lamp.

Claims

1. The utility model provides a small-size high performance direct current motor drive board, its characterized in that includes motor direct current drive chip (1), voltage spike elimination electric capacity (2), overcurrent detection resistance (3), motor direct current drive chip (1) include voltage comparator (4), built-in dead zone protection module (5), control logic module (6), H bridge drive circuit (7), the power input pin of motor direct current drive chip (1) connects voltage spike elimination electric capacity (2) one end and H bridge drive circuit (7) high side, voltage spike elimination electric capacity (2) other end ground connection, the low side of H bridge drive circuit (7) and voltage comparator (4) an input are connected overcurrent detection resistance (3), voltage comparator (4) other input is the reference voltage end, control logic module (6) are connected to voltage comparator (4) output, H bridge drive circuit (7) are connected to built-in dead zone protection module (5) input, control logic module (6) are connected to built-in dead zone protection module (5) output.

2. A small high performance dc motor drive board according to claim 1, characterized in that the voltage spike removing capacitor (2) is a bulk parent capacitor.

3. A small high-performance dc motor driving board according to claim 1, characterized in that the overcurrent detecting resistor (3) has a resistance value of 0.2 ohm to 1 ohm.

4. The small high-performance direct current motor driving plate according to claim 1, wherein the power input port, the signal input port and the signal output port of the motor direct current driving chip (1) are respectively connected with a power input indicator lamp, a signal input indicator lamp and a signal output indicator lamp.

5. A small high performance dc motor drive board according to claim 1, characterized in that the voltage comparator (4) is an operational amplifier.

6. A small high performance dc motor drive board according to claim 1, characterized in that the built-in dead zone protection module (5) is an or gate circuit.

7. A miniature high-performance dc motor driving board according to claim 1, characterized in that the control logic module (6) is a micro MCU chip.

8. A miniature high-performance dc motor drive board according to claim 1, characterized in that the H-bridge drive circuit (7) is a MOSFET-tube based H-bridge drive circuit.