Low-voltage-side overvoltage protection circuit

A voltage protection and circuit technology, applied in the field of low-voltage side overvoltage protection circuits, can solve problems such as poor prevention reliability, and achieve the effect of strong versatility and fast protection in real time.

Inactive Publication Date: 2015-09-30
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of poor reliability of PTC thermistor overvoltage protection in the prior art. According to one aspect of the present invention, a low-voltage side overvoltage protection circuit is proposed

Method used

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specific Embodiment

[0037] Such as Figure 5 Shown is a circuit schematic diagram of a specific embodiment of the present invention, assuming that the normal setting voltage range of the low voltage side overvoltage protection circuit of the present invention is 8V-21V.

[0038] Such as Figure 7 As shown, assuming that the resistance value of the first voltage dividing resistor R501 is 20KΩ, and the resistance value of the second voltage dividing resistor R502 is 4.7KΩ, according to the formula U0=R502 / (R501+R502)*U2, the conduction diode D505 can be obtained The conduction voltage parameter U0=3.9V. In a specific embodiment of the present invention, the first triode V506 can use a 2SC2412K triode (not limited thereto), the second triode V404 can use a 2SD1780 triode or a 2SC1623 triode (not limited thereto), and the switch tube V20 can use a 2SB1260 triode (not limited to this).

[0039] Such as Figure 6-Figure 7 As shown, the parameters of each component are set as follows: the first curr...

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Abstract

The invention discloses a low-voltage-side overvoltage protection circuit. The low-voltage-side overvoltage protection circuit includes a switch tube, a first control circuit and a second control circuit. The output terminal of the second control circuit is connected to the input terminal of the first control circuit. The output terminal of the first control circuit is connected with a base electrode of the switch tube. A collector electrode of the switch tube is connected to output voltage. A transmitting electrode of the switch tube, the first control circuit and the second control circuit are connected to input voltage separately. The low-voltage-side overvoltage protection circuit can work under comparatively low voltage and does not need protection from a large number of composite PTCs. The protection real time performance is high and the universality is good. By adopting the circuit provided by the invention, a load on the rear end of the output voltage can be controlled accurately in real time so as to avoid damage and a protection function can be realized through quick circulation control when low input voltage is over range.

Description

technical field [0001] The invention relates to the field of power monitoring, in particular to a low-voltage side overvoltage protection circuit. Background technique [0002] With the power industry becoming more and more intelligent, a large number of power energy efficiency monitoring terminals, three-phase four-wire meters and electricity information collection terminals are installed and used, and the installation of the meter device on site will also cause the reverse connection of the phase line and the neutral line. Case. What came into being to deal with it is of course the protection of the smart meter against the reverse connection of the phase line and the neutral line, also known as the protection of the input voltage of 1.9 times UN. [0003] The existing technology is divided into three schemes, one scheme is to use PTC thermistor to prevent overvoltage; the other is to use the smaller magnetic saturation current of the transformer to resist 4 overvoltage wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20H02H3/24
Inventor 冯保才马宗超赵玲胡志志
Owner STATE GRID CORP OF CHINA
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