Multi-module parallel input circuit for reverse connection prevention, overvoltage and undervoltage protection and isolation startup and shutdown

Abstract

The invention discloses a multi-module parallel input circuit for reverse connection prevention, overvoltage and undervoltage protection and isolation startup and shutdown. The multi-module parallel input circuit comprises a reverse connection prevention circuit, an overvoltage protection circuit, an undervoltage protection circuit, a multi-power-supply-module parallel input circuit and an isolation startup and shutdown circuit. The circuit has the advantage of realizing the functions of reverse connection prevention, overvoltage and undervoltage protection and isolation startup and shutdown. A reverse connection prevention circuit is realized by using a PMOS transistor and a voltage stabilizing tube, so that the module is prevented from being damaged by reverse connection input. The voltage stabilizing tube and the triode are used for realizing an overvoltage and undervoltage protection circuit, and the module can still work normally when normal voltage is input again after overvoltage and undervoltage; and the module is ensured not to work outside the specified range of the input voltage. The optocoupler is used for realizing isolation between module input ground and startup and shutdown control ground, thereby ensuring stable and reliable operation of the circuit. The circuit structure is simple, and the component cost is economical. And the expensive cost of the traditional voltage sampling for an operational amplifier chip and an independent source is avoided. Therefore, the efficiency of the whole machine is also improved.

Description

technical field [0001] The invention relates to the field of input circuits, in particular to a multi-module parallel input circuit for anti-reverse connection, over-undervoltage protection and isolation switch. Background technique [0002] In the research and development of some electronic products, not only voltage and current supplies of various specifications are required, but also small size, light weight, and high efficiency are required; therefore, multi-power modules are widely used in electronic product research and development, and the single output of multi-power modules can avoid crossover Disadvantages of interference. However, the current design of the input circuit of the multi-module power supply has the disadvantage of non-isolated hard switch, which directly cuts off the input voltage, and the switch will cause the interference of peak current and peak voltage under the condition of full load. [0003] However, the present invention can realize isolated s...

AI Technical Summary

Problems solved by technology

However, there is a non-isolated hard switch in the current design of the input circuit of the multi-module power supply, which directly cuts off the input voltage. Under the condition of full load, the switch will cause the interference of peak current and peak voltage.

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