DC over-voltage protection circuit
An overvoltage protection circuit, the technology of the circuit, applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, protection reacting to overvoltage, etc., can solve the following circuit and transient suppression It can prevent the impact of the circuit breaker, affect the normal operation and efficiency of the circuit, and burn out the resistance and transient suppressor, so as to suppress the peak and surge, improve the compatibility and reliability of the power supply, and reduce the insertion loss.
Active Publication Date: 2010-11-03
成都飞机工业(集团)电子科技有限公司
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Problems solved by technology
On the one hand, this circuit has a certain effect on the peak with a narrow pulse width, but it often causes the resistor and transient suppressor to burn out for a surge with a wider width
On the other hand, since a resistor is connected in series at the input end, a certain voltage drop is caused. For a high-power type of post-stage circuit, if a larger resistance value is used, it will inevitably cause a large voltage drop and affect the normal operation of the circuit. and efficiency; if a smaller resistance value is used, when the high-voltage surge arrives, it will cause a great impact on the subsequent circuit and transient suppressor, and the reliability of the protection is too low
Method used
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[0014] exist figure 1 Among them, the anti-transient voltage circuit is composed of transistor Q1, resistor R1, and ripple detection and suppression capacitor C1. The peak absorbing circuit is composed of transistor Q1, output filter capacitor C2 and diode D2. Diode D2 is a transient suppressor. The voltage limiting circuit is composed of a transistor Q1, a resistor R1, and an overvoltage detection Zener diode D1. In the DC overvoltage protection circuit composed of these three circuits electrically connected to each other, the voltage input terminals are respectively electrically connected to the variable impedance electronic switch, the overvoltage detection circuit and the ripple detection circuit, and the overvoltage detection circuit and the ripple detection circuit are electrically connected to each other. The input end of the variable impedance electronic switch is electrically connected with the output end of the variable impedance electronic switch to the peak absor...
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The present invention provides a DC overvoltage protection circuit, including a voltage limiting circuit mounted on the circuit board of the case, characterized in that the voltage input end is electrically connected with a variable impedance electronic switch, an overvoltage detecting circuit and a ripple detecting circuit respectively, the overvoltage detecting circuit and the ripple detecting circuit are electrically connected to the input end of the variable impedance electronic switch, the output end of the variable impedance electronic switch is electrically connected to the spike snubber circuit, output voltage by the voltage output end. The invention is used as an attaching device which is serial connected on the front of the product using electricity, capable of preventing spike and surge, the circuit has lower voltage drop at the same time, the circuit is general, fir for product having larger power and smaller power, having widely application. The invention adopts unit having smaller volume adding the upper limit of the working voltage of the present product, greatly improving the power supplying compatible ability and the credibility of the electrical appliance compared with the traditional spike, surge preventing circuit.
Description
technical field [0001] The invention relates to an overvoltage protection circuit device of an airborne electronic product. Background technique [0002] General airborne electronic products have a limited range of input power requirements, and the power supply may exceed the upper limit, such as overvoltage surges. This requires the product to have a certain ability to withstand overvoltage. Most of the airborne electronic products in the prior art usually adopt the method of connecting resistors in series at the input end and adding a transient suppressor for overvoltage resistance, but the application range thereof is very limited. On the one hand, this circuit has a certain effect on the peak with a narrow pulse width, but it often causes the resistor and the transient suppressor to burn out for the surge with a wide width. On the other hand, since a resistor is connected in series at the input end, a certain voltage drop is caused. For a high-power type of post-stage ...
Claims
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IPC IPC(8): H02H9/04H02H3/20
Inventor 陈雁
Owner 成都飞机工业(集团)电子科技有限公司