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Half bridge arm protection circuit

A technology for protecting circuits and bridge arms, which is applied in the field of half-bridge arm protection circuits, can solve the problems of bulky size and increased cost, and achieve the effects of strong anti-interference ability, fast processing speed and low cost

Active Publication Date: 2019-06-07
山东汉格威新能源汽车电控制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its shortcomings are also very obvious. In high-power applications, in order to meet the high current demand, the current-sensing resistor or transformer will become very bulky and the cost will increase a lot.

Method used

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without cre...

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Abstract

The invention discloses a half bridge arm protection circuit comprising a DC power source, a detection circuit, a driving circuit, a microprocessor and a signal latch circuit. By detecting and comparing the timing relationship between the HPWM, the LPWM and the HS through the half bridge arm protection circuit, the signal latch circuit will issue a fault signal to turn off the power tube in time to protect it from damage when an abnormal timing relationship occurs. The half bridge arm protection circuit avoids the problems of high volume and high cost in the prior art in the high power application, and only needs to process and detect digital signals, which has fast processing speed, strong anti-interference ability and lower cost.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a half-bridge arm protection circuit. Background technique [0002] Such as figure 1 The half-bridge arm shown is widely used in PWM motor control, DC-AC inverter, electronic ballast and other occasions. Due to the structural characteristics of the half-bridge arm, the upper and lower semiconductor power transistors are controlled by an antiphase signal (HPWM, LPWM). When one power transistor is turned on, the other is turned off, so that the output point HS gets a voltage from B- Pulse signal to B+. During the working process of the semiconductor power tube, due to factors such as the drive device or external interference, the output short circuit or the upper and lower power tubes are directly connected. At this time, the internal current of the power tube increases sharply, and in severe cases, the power tube is damaged. The current half-bridge protectio...

Claims

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Application Information

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IPC IPC(8): H02H7/20
Inventor 付岩吴得宗郝君勇
Owner 山东汉格威新能源汽车电控制造有限公司
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