A kind of bridge drive circuit control direction commutation anti-short circuit dead zone circuit
A circuit control and bridge drive technology, applied in electrical components, output power conversion devices, etc., can solve the problems of inaccurate dead time setting and large space occupation, and achieve accurate and adjustable dead time and high reliability. , the effect of low price
Active Publication Date: 2020-07-17
BEIJING MECHANICAL EQUIP INST
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Problems solved by technology
Charge-discharge circuit resistance difference method The driving circuit of each switching device needs to add a dead zone function circuit, which takes up a lot of space, and the dead zone time setting is not accurate
Method used
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[0036] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.
[0037] This embodiment discloses a bridge drive circuit to control direction commutation anti-short circuit dead zone circuit, such as figure 1 Said, including dead time setting module 2, commutation detection module 3 and PWM output module 4;
[0038] The dead time setting module 2 is used to perform shaping and dead time delay on the input control direction signal DIR_IN, compare it with the input reference level V_REF, and output the delayed control direction signal DIR_O;
[0039] It should be noted that the control direction signal DIR_IN is an external input signal for controlling the rotation direction of the motor.
[0040] The commutation det...
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The invention relates to a bridge type driving circuit control direction commutation anti-short-circuit dead zone circuit and belongs to the technical field of motor driving, and the problem of the short circuit of a bridge arm during commutation is solved. The circuit comprises a dead zone time setting module, a commutation detecting module and a PWM output module. The dead zone time setting module is used for performing a dead zone time delay on an inputted control direction signal and outputting a delay control direction signal. The commutation detection module is used for comparing logic levels of the control direction signal and the delay control direction signal and outputting a commutation flag signal. The PWM output module is used for judging whether the commutation flag signal isvalid or not, locking a PWM output signal if so, and normally outputting the PWM output signal is not. According to the invention, a control direction commutation dead zone is generated, the occurrence of a short circuit fault when upper and lower switching tubes of the same bridge arm are alternately turned on and off is prevented, the dead zone time is precise and adjustable, and the circuit hasthe advantages of simple realization, high reliability, low price and small volume..
Description
technical field [0001] The invention relates to the technical field of motor drive, in particular to a bridge drive circuit control direction reversing anti-short circuit dead zone circuit. Background technique [0002] The full-bridge driver can realize forward and reverse drive control, and is widely used in motor control, active magnetic levitation control and other fields. Common full-bridge drive circuits include H-bridge drive circuits, three-phase full-bridge drive circuits, and the like. When the control direction is reversed, the upper and lower bridge arms of the full-bridge drive circuit need to be switched on and off. If the time of on and off is not well controlled, there is a risk of short circuit between the upper and lower bridge arms. Especially for switching devices with slow turn-off speed and severe tailing of the turn-off current, in order to prevent the short-circuit of the bridge arm from burning down the driver, the anti-short circuit design of the d...
Claims
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IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 刘超余东东匡晓霖马俊
Owner BEIJING MECHANICAL EQUIP INST