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Open circuit and short circuit detection circuit and motor control circuit

A short-circuit detection and circuit technology, applied in short-circuit test, continuity test and other directions, can solve problems such as inability to obtain accurate test results

Inactive Publication Date: 2022-04-12
GUANGDONG GREATER BAY AREA INST OF INTEGRATED CIRCUIT & SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The full bridge circuit is a typical DC motor control circuit. The full bridge circuit often needs to detect open circuit and short circuit. In order to effectively realize the detection, the embedded detection circuit is a commonly used detection method. Short circuit detection, while the traditional voltage detection method can not be well applied to the full bridge circuit, can not get accurate detection results

Method used

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  • Open circuit and short circuit detection circuit and motor control circuit
  • Open circuit and short circuit detection circuit and motor control circuit
  • Open circuit and short circuit detection circuit and motor control circuit

Examples

Experimental program
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Embodiment 1

[0031] figure 1 A schematic diagram of the connection between the traditional full-bridge driving circuit and the open-circuit and short-circuit detection circuits of the embodiments of the present application is shown.

[0032] like figure 1 As shown, the conventional full-bridge driving circuit includes a motor M and four MOS transistors (M1, M2, M3, and M4), and the gates of the four MOS transistors receive driving control signals (cmd-1 and cmd-2). In the open circuit and short circuit detection circuit of the present application, the two detection terminals (OUT-C-Se and OUT-D-Se) are directly connected to both ends of the winding coil by wires to obtain the power-off voltage.

[0033] When the motor M is in the OFF state, the voltages at both ends of the coil are equal, and the two ends of the winding coil are directly connected with wires to obtain the power-off voltage.

[0034] The principle of the open-short circuit detection circuit of the present application is t...

Embodiment 2

[0072]This embodiment 2 provides a motor control circuit, including the open circuit and short circuit detection circuits in any of the implementation manners in the embodiment 1. For details not disclosed in the motor control circuit of this embodiment, please refer to the specific implementation contents of the open circuit and short circuit detection circuits in other embodiments.

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Abstract

The invention provides an open circuit and short circuit detection circuit and a motor control circuit. The open circuit and short circuit detection circuit comprises a first diagnosis branch and a second diagnosis branch, the first diagnosis branch comprises a pull-up circuit, a first detection end and a first level circuit; the second diagnosis branch comprises a pull-down circuit, a second detection end and a second level circuit; the first detection end and the second detection end are respectively connected with two ends of a motor winding coil in the full-bridge driving circuit; enabling signals are input into the pull-up circuit and the pull-down circuit; and finally, judging a load connection state in the full-bridge driving circuit according to the first level signal and the second level signal. According to the circuit for circuit diagnosis in the full-bridge circuit closed state, the motor winding fault can be detected without using a sensor.

Description

technical field [0001] The present application belongs to the technical field of electronic circuits, and in particular, relates to an open circuit and short circuit detection circuit and a motor control circuit. Background technique [0002] Full-bridge circuits are widely used in PWM motor control, AC-DC inverters, electronic ballasts and other occasions. Among them, there are two groups of power switch tubes connected in series as bridge arms. The two sets of diagonal switch tubes are given control signals that are opposite to each other. When one set of power tubes is turned on, the other set is turned off. Alternate conduction, energy exchange is carried out through the primary winding in the main transformer in the full-bridge circuit, and the conversion of voltage input to output is completed. [0003] The full-bridge circuit is a typical DC motor control circuit. The full-bridge circuit often needs to detect open circuits and short circuits. In order to effectively ...

Claims

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Application Information

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IPC IPC(8): G01R31/54G01R31/52
Inventor 连成洲王云郝炳贤张建华薛静张梦楼玥梁福焕李荣荣陆超郑凯华
Owner GUANGDONG GREATER BAY AREA INST OF INTEGRATED CIRCUIT & SYST
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