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Switching Power Supply and LED Driving Circuit

A switching power supply and control circuit technology, applied in the field of power electronics, can solve problems such as resistance value being easily affected by wet environment, false triggering of output open circuit protection, and LED load flickering, etc., to improve anti-interference ability, save compensation capacitors, reduce Effects of Peripheral Devices

Pending Publication Date: 2019-01-04
JOULWATT TECH INC LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ground of the control circuit is floating, the VCC capacitor (power supply capacitor C1) is required to maintain the power supply. The FB voltage divider resistor samples the output voltage when the main power tube is turned off, and its resistance value is easily affected by the humid environment, which may cause the output to open. The protection is falsely triggered, which causes the LED load to flicker, and there are many peripheral devices in the prior art
In summary, the existing high power factor constant current control scheme has high system cost and low reliability

Method used

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  • Switching Power Supply and LED Driving Circuit
  • Switching Power Supply and LED Driving Circuit
  • Switching Power Supply and LED Driving Circuit

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Embodiment Construction

[0023] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0024] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0025] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses a switching power supply and an LED driving circuit. The switching power supply comprises a main power tube and a control circuit. The control circuit is connected with the control end of the main power tube to control the switching state of the main power tube. The control circuit comprises a power supply module and an overvoltage protection module, wherein the power supply module and the overvoltage protection module are both connected with a high potential end of an input voltage; the power supply module comprises a voltage limiting unit and a filter unit; one end ofthe voltage limiting unit is connected with a high potential end of the input voltage, and the other end is connected with the filter unit; The input terminal of the overvoltage protection module isconnected with the high potential terminal of the input voltage. The overvoltage protection module samples the input voltage, performs proportional adjustment on the sampled signal, compares the signal with the corresponding overvoltage reference signal, and judges whether the overvoltage phenomenon occurs according to the comparison result. The invention has the advantages of fewer peripheral devices, low system cost and high reliability.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a switching power supply and an LED driving circuit. Background technique [0002] In the prior art, when a switching power supply is used to supply power to a load, the inductor current and the output voltage are usually sampled, and feedback is performed according to the corresponding sampling signal, so as to realize the adjustment of the output current or the output voltage. [0003] For high power factor (power factor, PF) LED driving circuit or constant voltage power supply, existing technical solutions such as figure 1 As shown, the control circuit is integrated in the chip, and the chip ground is connected to the high-voltage side, which is convenient for sampling the output current. Among them, VCC is the power supply pin, COMP is the compensation pin, FB is the output voltage sampling pin, DRAIN is the drain terminal of the MOS, ISP is the current sampling pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 何耀华周逊伟
Owner JOULWATT TECH INC LTD
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