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Soft starting circuit

A soft start circuit and soft start technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of small charging circuit resistance, large grid side impact current, and threat to safe operation, so as to reduce pollution and avoid surges Excessive current, to achieve the effect of safety and reliability

Inactive Publication Date: 2017-05-31
SUNWODA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional starting method, the input power is directly charged to the capacitor after rectification, the charging circuit resistance is small, and the inrush current is large, which will cause excessive inrush current on the grid side, posing a threat to its safe operation and other adverse conditions

Method used

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Embodiment Construction

[0026] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] refer to figure 1 , a soft start circuit, including a relay element 1, a rectifier 2, a PTC thermistor 3, an electrolytic capacitor 5 and a controller; the relay element 1 includes a soft start relay and a main circuit relay; one end of the soft start relay is connected to an AC power supply, and the other end Connect the input end of the rectifier 2, the output positive end of the rectifier 2 is connected to one end of the PTC thermistor 3, the other end of the PTC thermistor 3 is connected to the positive end of the electrolytic capacitor 5, and the negative end of the electrolytic capacitor 5 is connected to the negative end of the rectifier 2 to form a loop; One end of the main circuit relay is connected to the AC power supply, the other end is connected to the main circuit, and the main circuit is connecte...

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PUM

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Abstract

The invention discloses a soft starting circuit, which comprises a relay element, a rectifier, a PTC thermistor, an electrolytic capacitor and a controller, wherein the relay element comprises a soft starting relay and a main circuit relay; one end of the soft starting relay is connected with an AC power supply and the other end is connected with an input end of the rectifier; an output positive end of the rectifier is connected with one end of the PTC thermistor and the other end of the PTC thermistor is connected with a positive end of the electrolytic capacitor; a negative end of the electrolytic capacitor is connected with the negative end of the rectifier to form a loop; one end of the main circuit relay is connected to the AC power supply and the other end is connected with a main circuit; the main circuit is connected to the positive end and the negative end of the electrolytic capacitor; and when the controller detects that charging voltage of the electrolytic capacitor reaches a preset value, the controller controls the soft starting relay to be open and the main circuit relay to be closed. The electrolytic capacitor is charged through controlling the on-off state of the relay, so that a short circuit due to the fact that surge current input by the AC power supply is over-high and a power component of a power supply system is shocked to be damaged is avoided and the security and the reliability of the circuit are achieved.

Description

technical field [0001] The invention relates to the technical field of electronic power application, in particular to a soft start circuit. Background technique [0002] In the field of power supply, when high-power chargers, adapters, high-power charging and discharging equipment, charging piles, etc. need high-power charging, a surge current of tens to hundreds of amperes will be generated at the moment of starting up. [0003] The inrush current is the maximum peak current that flows into the power supply device at the moment the power is turned on. Due to the rapid charging of the input filter capacitor, the initial voltage on the capacitor is zero, which is equivalent to a short circuit, and a large current will be formed at the moment of charging, which may cause the fuse to blow, the power grid to trip, the contact of the closing switch to burn out, and the rectifier bridge to be damaged. , Seriously affect the service life of electronic components, and also cause se...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M1/34
CPCH02M1/34H02M1/36H02M1/348
Inventor 徐智慧刘兵区敏聪
Owner SUNWODA ELECTRONICS
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