Servo driver and buffer loop protection circuit thereof

Abstract

The invention discloses a buffer loop protection circuit. The method comprises the following steps of considering that a controllable switch in a buffer loop cannot be successfully closed when a faultoccurs; this case, the charging of the energy storage capacitor is completed; when the controllable switch needs to be closed, the voltage detection module detects a relatively high voltage across the two ends of the buffer resistor. When the power-on time reaches the preset time period and the voltage values at the two ends of the buffer loop are higher than the preset threshold value, the prompter is controlled to prompt the controllable switch to fail, so that workers can know and overhaul the controllable switch conveniently, the buffer resistor is prevented from being damaged due to excessive electric energy consumption, and the failure is prevented from being further expanded. The invention further discloses a servo driver which has the same beneficial effects as the buffer loop protection circuit.

Description

technical field [0001] The invention relates to the field of circuit protection, in particular to a buffer circuit protection circuit, and also to a servo driver. Background technique [0002] The main circuit of devices such as servo drives or frequency converters usually includes a buffer circuit and an energy storage capacitor connected to the buffer circuit. The energy storage capacitor can store DC power and provide stable DC power to the back-end load. The buffer circuit includes buffer resistors As well as the controllable switch connected in parallel with the buffer resistor, the energy storage capacitor is equivalent to a short circuit at the moment of power-on, so the controllable switch can be controlled to be in the off state at the moment of power-on, and the buffer resistor can be in the charging process of the energy storage capacitor In order to protect the circuit, divide the voltage in order to protect the circuit. After the power of the energy storage capa...

AI Technical Summary

Problems solved by technology

[0003] However, the controllable switch has the possibility of failure. When the controllable switch fails, the user cannot know, which will cause the buffer resistor to be continuously connected to the charging circuit of the energy storage capacitor, which not only consumes a lot of power, but also reduces The service life of the snubber resistor, there is a risk of further expansion of the fault

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