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Power circuit and lighting equipment thereof

A technology of power supply circuit and feedback circuit, which is applied in the direction of electric light source, lighting device, electroluminescent light source, etc., can solve the problems of complicated circuit and high cost of RCC switching power supply, and achieve the effect of small volume and weight, simple structure and easy control

Pending Publication Date: 2019-05-21
KENNEDE ELECTRIONICS MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] RCC circuits are gradually being applied to the field of LED lighting and used as driving circuits for LED lighting. However, most of the RCC switching power supply circuits in the prior art are completed by ICs to form PWM control for the switching tubes, or the existing circuits are too complicated. The cost of the RCC switching power supply is relatively high

Method used

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  • Power circuit and lighting equipment thereof

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Embodiment Construction

[0024] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0025] like figure 1 As shown, the power supply circuit of this embodiment includes: a rectifier circuit 10, a transformer T1, a switch tube Q1, a diode D2, a feedback circuit 20 and a current reverse bias circuit 40;

[0026] The rectifier circuit 10 is connected to the transformer T1 and the base of the switching tube Q1 to supply power. The switching tube Q1 is electrically connected to the primary coil of the transformer T1 to control the current of the primary coil.

[0027] The feedback circuit 20 is connected in series bet...

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Abstract

The invention discloses a power circuit. The power circuit comprises a transformer T1, a switch tube Q1, a diode D2 and a feedback circuit, wherein the switch tube Q1 is electrically connected with aprimary coil of the transformer T1 to control a current of the primary coil, a base of the switch tube Q1 is electrically connected with a power input end, the feedback circuit is connected in seriesbetween the base of the switch tube Q1 and an output end of secondary coil of the transformer T1, the diode D2 is connected in series between the secondary coil of the transformer T1 and a load end OUT-, and a positive electrode of the diode D2 is connected to the load end OUT-. The circuit employs the performance characteristics of an electrical component to ingeniously design the circuit, the circuit is simple in structure and low in construction cost, a self-oscillation action control circuit does not need auxiliary power supply, the effects of low cost and small volume weight are also brought by circuit simplification and optimization, and an output voltage is easy to control. Moreover, the invention discloses lighting equipment employing the power circuit.

Description

technical field [0001] The invention relates to the field of power circuits. Background technique [0002] The non-fixed frequency power supply RCC (Ringing Choke converter) is a self-excited oscillation pulse converter composed of a intermittent oscillator, which is commonly used in low-cost low-power switching power supplies. At present, the overvoltage protection in the RCC circuit adopts the method of voltage feedback of the subsequent stage circuit, and the latter stage circuit feeds back the voltage signal to the input circuit through the optocoupler, and a switch tube is arranged between the input circuit and the optocoupler. The on-off of the switch tube needs to correspond to the corresponding voltage value. When the feedback voltage value is low voltage, the switch tube is in the off state, and the overvoltage protection circuit is not conducted; when the feedback voltage value is high voltage, the switch tube is in the closed state. , the overvoltage protection c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
Inventor 谢汉飞
Owner KENNEDE ELECTRIONICS MFG CO LTD
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