Transient interlocking protection circuit

Abstract

The invention discloses a transient interlocking protection circuit. The circuit comprises a fault signal collection circuit, a falling edge time delay circuit and a high-speed driver. The fault signal collection circuit is used for collecting transient fault signals, the output end of the circuit is connected with the falling edge time delay circuit; the falling edge time delay circuit is used for converting narrow pulses of the fault signals into wide pulses, the output end of the falling edge time delay circuit is connected with the high-speed driver, and the output end of the high-speed driver is connected with a driving enabling terminal of a driver of load equipment and used for outputting low-level signals to the enabling terminal in time after receiving the fault signals. The transient interlocking protection circuit has the advantages that the circuit is simple and effective, the relative cost is relatively low, the transient interlocking protection is accurately realized, a transient fault signal can be accurately detected, the protection is timely carried out, the voltage of the enabling terminal is reduced, the enabling terminal cannot work, and meanwhile, the self-locking protection of the enabling terminal after the voltage is reduced can be carried out through the circuit.

Description

technical field [0001] The invention relates to the field of pulse power electronic technology and switching power supply technology, in particular to a transient chain protection circuit, especially suitable for solid-state switching modulator power supply and various pulse power supplies. Background technique [0002] With the continuous update and rapid development of switching power supply technology, as well as the miniaturization, high frequency and high reliability of high-power semiconductor devices, high-frequency and high-voltage switching power supplies have penetrated into many industries. In pulse power electronic systems, Such as pulse modulators, pulsed lasers, electromagnetic rail guns, etc., with the continuous improvement of circuit operating frequency and power, there will inevitably be some transient faults in the circuit. If the continuous transient faults are not handled and protected in time, it will cause the control circuit If it cannot work, it will...

AI Technical Summary

Problems solved by technology

[0002] With the continuous update and rapid development of switching power supply technology, as well as the miniaturization, high frequency and high reliability of high-power semiconductor devices, high-frequency and high-voltage switching power supplies have penetrated into many industries. In pulse power electronic systems, Such as pulse modulators, pulsed lasers, electromagnetic rail guns, etc., with the continuous improvement of circuit operating frequency and power, there will inevitably be some transient faults in the circuit. If the continuous transient faults are not handled and protected in time, it will cause the control circuit If it cannot work, it will cause damage to power components or load equipment, or even cause a fire. Therefore, the requirements for accurate detection and judgment of transient faults and effective protection will become higher and higher. Designers often use high-speed chips FPGA (or CPLD) to Solve the problem of transient fault detection, but FPGA (or CPLD) is expensive, requires additional programming, and the circuit is complicated, so it is not suitable for low-cost applications

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