Phase abnormity detection device and power supply with phase abnormity detection function

Abstract

The invention relates to a power supply and a phase abnormity detection device thereof. The device is used for detecting a phase signal output by a synchronous rectifier and comprises a phase judgment unit, a rectifying unit, a voltage-stabilizing unit, a switch and a warning unit, wherein the phase judgment unit is coupled to the synchronous rectifier, receives the phase signal and outputs a phase abnormity signal when the phase signal is abnormal; the rectifying unit is coupled to the phase judgment unit and rectifies the phase abnormity signal so as to output a low-potential signal; the voltage-stabilizing unit is coupled to the rectifying unit and receives the low-potential signal so as to generate a cut-off signal; the switch is coupled to the voltage-stabilizing unit and is controlled by the cut-off signal for realizing cutoff; and the warning unit is coupled to the switch and generates a warning according to the cutoff of the switch. The invention detects whether the phase signal output by the synchronous rectifier is abnormal or not by utilizing the phase abnormity detection device and sends out the warning in abnormity, thereby realizing real-time detection.

Description

technical field [0001] The present invention relates to a phase anomaly detection device and a power supply with a phase anomaly detection function, in particular to a phase anomaly detection device and a Power supply with phase anomaly detection function. Background technique [0002] According to the currently known DC power supply devices, such as AC To DCSwitching Power Supply, in order to reduce the size of the transformer, most of them use high-frequency pulse width modulation (PWM) to control the DC output voltage, such as figure 1 Shown is a schematic circuit diagram of a traditional power supply device. exist figure 1 Among them, the transformer T divides the circuit into a pre-stage circuit 101 on the primary side and a post-stage circuit 102 on the secondary side. The post-stage circuit 102 is composed of a first switch Q1, a second switch Q2, an inductor L and a capacitor C1. The output terminals TA and TB of the secondary side of the transformer T are respect...

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Problems solved by technology

However, this method consumes a lot of human resources, and at the same time, it cannot detect immediately when a problem occurs in the synchronous rectifier 1020, thus increasing the difficulty for maintenance engineers to repair.

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