Digital fixed frequency anti-interference circuit

Abstract

This invention relates to a digital anti-interference circuit with fixed frequency including: a phase reverser used in reversing waveforms, the input of which is connected with a primary square V1 generating triangle carrier signals, the output signal V3 is sent to an input pin of a double-input exclusive-OR gate and V1 is connected to the input end of a two-D trigger, an exclusive-OR gate used in comparing the input end through th reversed primary square V3 and PWM control signal Vin with burrs, the output signal V2 is sent to the CLK of the two-D trigger, a double D trigger for shaping the burr PWM control signals so as to output smooth waveforms Vo.

Description

technical field [0001] The invention relates to an anti-jamming circuit, in particular to a digital fixed-frequency anti-jamming circuit. It is suitable for power electronic conversion circuits. Background technique [0002] In power electronic devices, due to the switching of power devices, it will cause strong radio frequency and conduction interference, which will affect the work of the control circuit in severe cases, making it unable to work normally. Especially in high-frequency power conversion devices, a situation that is more likely to occur is that the adjustment signal is susceptible to interference from the main switching device at the moment of turning on or off. Multiple switching of power devices in one cycle (such as figure 1 Shown), so that the switching frequency increases, the loss increases, the mild ones cause the deterioration of the control performance, and the severe ones cause the damage of the main power tube. Contents of the invention [0003]...

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Problems solved by technology

[0002] In power electronic devices, due to the switching of power devices, it will cause strong radio frequency and conduction interference, which will affect the work of the control circuit in severe cases, making it unable to work normally

Especially in high-frequency power conversion devices, a situation that is more likely to occur is that the adjustment signal is susceptible to interference from the main switching device at the moment of turning on or off. Multiple switching of power devices in one cycle (such as figure 1 Shown), so that the switching frequency increases, the loss increases, the mild case will cause the deterioration of the control performance, and the severe case will cause the damage of the main power tube

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