Motor drive circuit with dead band time delay

A technology of motor drive circuit and photoelectric isolation circuit, which is applied in the field of circuits, can solve problems such as low anti-interference ability and direct connection of upper and lower bridge arms, and achieve the effects of strong anti-interference ability, reduced interference, and reduced design difficulty and burden
CN103560728AInactive Publication Date: 2014-02-05SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
Publication Date
2014-02-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a motor drive circuit with dead band time delay. The motor drive circuit comprises an H-bridge circuit connected with a motor. The H-bridge circuit is controlled by a photoelectric isolating circuit, a dead band time delay control circuit and a half-bridge drive control circuit and controls the steering of the motor through adjusting breakover and the check time order of an MOS tube. A pair of complementary input signals are output through a double-path photoelectric coupler, and two paths of signals enter the dead band time delay control circuit. Control signals complementary with two alternative denial gate output paths are in concatenation through two paths. Signals output by the dead band time delay control circuit are respectively input to two symmetric units in the half-bridge drive control circuit. The dead band delay control circuit controls the time of a dead band, and simultaneous breakover of two MOS tubes of the same arm is prevented. Dead band time can be adjusted flexibly. The photoelectric isolating circuit increases anti-interference capacity, and reduces interference of H-bridge control signals to a front-grade circuit when an H-bridge outputs large currents in an instant state or a motor is started. The motor drive circuit can work with power supplied by a single power supply.
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Description

[0001] technical field

[0002] The invention relates to a motor drive circuit, in particular to a motor drive circuit with dead zone delay, and belongs to the technical field of circuits. Background technique

[0003] The power drive circuit of the motor is usually driven by an H-bridge structure circuit. The H-bridge circuit is composed of four power switch MOS tubes. A control structure is used to control the conduction and cut-off of the four switch tubes, so that the motor rotates forward and reverse. turn or stop. After adding complementary signals to the power switch MOS tubes of the upper and lower bridge arms of the H-bridge drive circuit, the turn-off time of the power switch MOS tubes is usually longer than the turn-on time under load conditions. In this way, the power switch MOS tubes of the lower bridge arm are not turned off in time When the upper bridge arm is first opened, the so-called "bridge arm through" fault will occur. This will cause the current to i...

Claims

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