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Rectifier bridge protection circuit, overvoltage protection device and power supply system

A technology of protection circuit and full-bridge rectifier circuit, applied in emergency protection circuit device, circuit device, emergency protection device with automatic disconnection, etc., can solve the problems of diode overvoltage breakdown, affecting the use of rectifier bridge, and rectifier bridge damage. , to achieve the effect of effective overvoltage protection and prolong service life

Inactive Publication Date: 2017-09-19
TIANJIN ZHONGLING SHINENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the AC power is rectified by the rectifier bridge circuit, it usually needs to be connected to the LC filter circuit. Since the output terminal of the rectifier bridge circuit is connected to the LC filter circuit, at the moment of power-on or surge, the instantaneous back pressure generated by the choke line in the LC filter circuit It may exceed the maximum withstand voltage of the diode in the rectifier bridge circuit, causing overvoltage breakdown of the diode, which in turn leads to damage to the entire rectifier bridge, affecting the use of the rectifier bridge in related products

Method used

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  • Rectifier bridge protection circuit, overvoltage protection device and power supply system
  • Rectifier bridge protection circuit, overvoltage protection device and power supply system
  • Rectifier bridge protection circuit, overvoltage protection device and power supply system

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Embodiment 1

[0040] An embodiment of the present invention provides a rectifier bridge protection circuit, such as figure 1 As shown, the rectifier bridge protection circuit includes a full bridge rectifier circuit, an overvoltage protection device and a DC terminal protector.

[0041] Wherein, the full-bridge rectifier circuit is specifically composed of four diodes D1, D2, D3, and D4 connected in a bridge manner. The overvoltage protection device is connected in parallel to both ends of each diode of the full-bridge rectifier circuit, and the overvoltage protection device includes at least one of a capacitor, a resistor (such as a common resistor, a varistor, etc.), a transient suppression diode, and a discharge tube. Preferably, the overvoltage protection device includes a capacitor, or an RC circuit formed in series with a capacitor and a resistor. Specifically, the overvoltage protection device used in the embodiment of the present invention uses a capacitor, that is, the four capacit...

Embodiment 2

[0047] Considering that the current overvoltage protectors usually use air switches or relays to monitor the voltage of the output line of the mains. When the voltage of the output line is too large, the power supply of the output line is cut off by means of air switch or relay disconnection, so as to realize the protection of the line and electrical equipment. However, the sensitivity of the existing overvoltage protector is low, and the circuit cannot be effectively protected when an overvoltage occurs.

[0048] Based on this, an embodiment of the present invention also provides an overvoltage protection device, which can be applied to power supply scenarios such as homes, offices, and factories. Such as figure 2 and image 3 As shown, the overvoltage protection device includes an induction coil L1, a rectifier bridge protection circuit and a protection chip.

[0049] Wherein, the induction coil is used to be wound on the secondary iron core of the transformer, and gener...

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Abstract

The invention provides a rectifier bridge protection circuit, an overvoltage protection device and a power supply system and relates to the technical field of circuit protection, effective overvoltage protection can be provided for a rectifier bridge, and thus the service life of the rectifier bridge is improved. The rectifier bridge protection circuit comprises a full bridge rectifier circuit, an overvoltage protection device and a DC end protector, wherein the overvoltage protection device is connected to two ends of each diode of the full bridge rectifier circuit in parallel, the DC end protector comprises a capacitor element, a resistor element and a metal oxide lightening arrester, the capacitor element and the metal oxide lightening arrester are connected in series and then are connected to a DC output end of the full bridge rectifier circuit in parallel, and the resistor element is connected to two ends of the capacitor element in parallel.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a rectifier bridge protection circuit, an overvoltage protection device and a power supply system. Background technique [0002] At present, in electronic circuits, the rectifier bridge is widely used as an important rectifier device. The rectifier bridge circuit is composed of four diodes connected in a certain way to form an electronic device with full-wave rectification function. After the AC power is rectified by the rectifier bridge circuit, it usually needs to be connected to the LC filter circuit. Since the output terminal of the rectifier bridge circuit is connected to the LC filter circuit, at the moment of power-on or surge, the instantaneous back pressure generated by the choke line in the LC filter circuit It may exceed the maximum withstand voltage of the diode in the rectifier bridge circuit, causing overvoltage breakdown of the diode, which in turn leads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/125H02H5/04
CPCH02H7/1252H02H5/042H02H7/1257
Inventor 马健马骥
Owner TIANJIN ZHONGLING SHINENG TECH CO LTD
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