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Silicon controlled rectifier control circuit, system and method

A control circuit and control system technology, applied in control/regulating systems, regulating electrical variables, instruments, etc., can solve the problem of low reliability, and achieve the effects of improving reliability, simplifying software complexity, and improving the turn-on time point.

Active Publication Date: 2020-04-10
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a thyristor control circuit, system and method to solve the problem of low reliability of the existing on-board charger when using the thyristor to control the inrush current

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  • Silicon controlled rectifier control circuit, system and method
  • Silicon controlled rectifier control circuit, system and method
  • Silicon controlled rectifier control circuit, system and method

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0049]The core idea of ​​the present invention is to solve the problem of low reliability of the current on-board charger when the surge current is controlled by the thyristor.

[0050] In order to realize this idea, the embodiment of the present invention provides a thyristor control circuit, please refer to figure 2 and image 3 , The thyristor control circuit 1 provided by the embodiment of the present invention includes: a voltage comparator 10 and a thyristor drive circuit 11 .

[0051] Wherein, the voltage comparator 10 is configured to compare the magnitude of the AC grid voltage and the reference voltage, and ...

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Abstract

The invention provides a silicon controlled rectifier control circuit, system and method. A reference voltage and an AC network voltage are compared through a voltage comparator so as to obtain a control signal of a silicon controlled rectifier drive circuit, thereby controlling the on and off of a silicon controlled rectifier. Compared with the prior art, the conduction time of the silicon controlled rectifier is no longer based on the predicted time, but is based on the conduction result of an AC voltage value and a reference voltage value obtained through actual sampling, so that the conduction time point of the silicon controlled rectifier circuit can be better controlled, the power grid energy is absorbed to a maximum extent, and the current impact response time is effectively shortened. Besides, the method for driving the silicon controlled rectifier by the circuit not only simplifies the software complexity, but also avoids the problem of overlarge impact current caused by sudden convex distortion of the AC power network voltage waveform in a descending stage, reduces the overcurrent probability of the impact current, and improves the reliability.

Description

technical field [0001] The invention relates to the technical field of on-board chargers, in particular to a thyristor control circuit, system and method. Background technique [0002] The on-board charger plays an important role in transferring grid energy to the battery. Due to the large capacitance inside the charger, a large inrush current will be generated immediately after the charger is connected to the AC grid. In order to meet the requirements of regulations and protect its own devices, the AC input side of the charger needs to have a corresponding control switch to control the voltage difference between the AC grid voltage and the internal capacitor of the charger at the moment of conduction, so as to limit the amplitude of the inrush current. [0003] The SCR can be turned on when the forward voltage drop is positive and enabled. Based on this characteristic, thyristors are being more and more used in the rectifier circuit on the AC grid side of the charger, and...

Claims

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Application Information

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IPC IPC(8): G05F1/45
CPCG05F1/45
Inventor 刘通唐志俊闻伟
Owner UNITED AUTOMOTIVE ELECTRONICS SYST