DC Motor Unidirectional Driver

A DC motor and driver technology, applied in the electronic field, can solve the problems of mutual influence of the output of the driving circuit and low utilization rate of the device, and achieve the effects of ensuring the control function and circuit reliability, improving the utilization rate, and simplifying the circuit design.

Active Publication Date: 2018-12-25
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure can be designed and optimized for the circuits of the two paths separately, but there is a risk of mutual influence between the outputs of the two drive circuits, and the device utilization is low

Method used

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  • DC Motor Unidirectional Driver
  • DC Motor Unidirectional Driver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] DC motor unidirectional drives such as figure 1 As shown, it includes a microcontroller chip S1, a PWM driver chip S2, a microcontroller monitoring circuit S3, a power switch circuit, and a bypass drive circuit;

[0036] The bypass drive circuit includes a bypass switch control circuit, a bypass power supply circuit, and a bypass power switch tube;

[0037] The bypass switch control circuit is used to control the opening and closing of the bypass power supply circuit;

[0038] The bypass power supply circuit is used to provide a turn-on voltage for the bypass power switch tube;

[0039] The bypass power switch tube is connected to the DC motor at the output end;

[0040] The power switch circuit is connected to a DC motor at the output end;

[0041] The PWM driver chip S2 has an independent charge pump module;

[0042] In the independent charge pump module, the voltage output terminal VPUMP is connected to the bypass power supply circuit of the bypass drive circuit;...

Embodiment 2

[0051] Based on the unidirectional DC motor driver of Embodiment 1, the bypass power switch tube adopts a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor) with over-current and over-temperature protection functions.

[0052] Preferably, the power switch circuit is a half-bridge power switch circuit.

[0053] Preferably, the microcontroller chip S1 controls the PWM driving chip S2 to output a driving signal through an internal bus.

[0054] Preferably, the PWM driver chip S2 adopts a multi-mode high-frequency PWM controller UCC39421 / 2.

[0055] In the DC motor unidirectional driver of the second embodiment, the bypass power switch tube of the bypass drive circuit adopts a MOSFET with over-current and over-temperature protection functions, and even in the bypass drive mode, it still has the output anti-short circuit and over-current functions .

Embodiment 3

[0057] Based on the DC motor unidirectional driver of Embodiment 1, such as figure 2 As shown, the bypass drive circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fourth transistor T4, a fifth transistor T5, The sixth transistor T6, the third power transistor T3, and the diode D1;

[0058] The enable signal output by the microcontroller monitoring circuit S3 is connected to the base of the fourth transistor T4 through the first resistor R1;

[0059] The emitter of the fourth transistor T4 is grounded, and the collector is connected to the base of the fifth transistor T5 through the second resistor R2;

[0060] The emitter of the fifth transistor T5 is connected to the voltage output terminal VPUMP of the independent charge pump module of the PWM driver chip S2; the collector is connected to the base of the sixth transistor T6 through the fourth resistor R4;

[0061] The third power tube T3 is an N-ty...

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PUM

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Abstract

The invention discloses a direct current motor one-way driver. When a microcontroller chip works normally, a microcontroller monitoring circuit enables a PWM driving chip and switches off a bypass driving circuit; and when the microcontroller chip works abnormally or is damaged, the microcontroller monitoring circuit forbids the PWM driving chip to output PWM driving signals and switches on the bypass driving circuit, at the moment, a power switch circuit is in a switch-off state, and the bypass driving circuit directly drives a direct current motor. According to the direct current motor one-way driver, hardware circuits of two driving paths of PWM driving and bypass driving of the motor are relatively independent, the micro-controller monitoring circuit switches the two paths according to the work state of the microcontroller chip, since the output voltage of a charge pump module of the PWM driving chip is shared, on the premise of guaranteeing the control function and the circuit reliability, the circuit design is simplified, and the utilization rate of the PWM driving chip is increased.

Description

technical field [0001] The invention relates to electronic technology, in particular to a one-way driver for a DC motor. Background technique [0002] In automotive applications, for a one-way driven fuel oil pump motor, a microcontroller can be used to adjust the average value of the voltage at both ends of the motor through PWM (PulseWidth Modulation, pulse width modulation) control to adjust the motor speed and torque. The application of the intelligent micro-controller chip makes the control of the oil pump motor more flexible. However, since the application of the microcontroller involves the writing of software, and with the continuous improvement of chip integration, the number of internal functional modules increases, and its failure forms also increase. In order to avoid the impact of these failures on system functions, for some oil pump drivers with high safety requirements, it is necessary to introduce a monitoring circuit independent of the microcontroller. When...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 于垂顺潘文姚伟余志洋刘斌彬王鹤龄
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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