Driving circuit and switching power supply

A driving circuit and switch technology, which is applied in the field of switching power supply, can solve the problems of transformer volume and weight increase, cost increase, and audio noise generation, so as to reduce the number of turns and the radius of the wire, reduce the volume weight and cost, and solve the problem of audio frequency noise. Effects of Noise Problems

Active Publication Date: 2019-03-26
FUJIAN RAYNEN TECH
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  • Application Information

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Problems solved by technology

HID light is an excellent light source with high efficiency and energy saving, but it has a defect, that is, it takes about 2-3 minutes to turn on the power under normal circumstances before the light can slowly light up, sometimes when there is a sudden power failure and the power supply is restored immediately It takes 10-20 minutes to light up again, and it cannot be turned on at one point like incandescent lamps and halogen lamps, which is very unsuitable for occasions that require instant start lighting
[0003] The inventor of the present application found in the long-term research and development process that in the prior art, in order to increase the lighting speed of the HID lamp, the lighting circuit of the ballast is usually used, that

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  • Driving circuit and switching power supply
  • Driving circuit and switching power supply
  • Driving circuit and switching power supply

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[0026] The application will be further described in detail below with reference to the drawings and embodiments. It is particularly pointed out that the following examples are only used to illustrate the application, but do not limit the scope of the application. Similarly, the following embodiments are only part of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0027] As the application fields of HID lamp sources such as metal halide lamps, high-pressure sodium lamps and mercury lamps become wider and wider, the consumption of low-frequency electronic ballasts is also increasing. Traditional low-frequency HID ballasts mostly use pulse transformers for lighting, and traditional low-frequency (tens of Hz to hundreds of Hz) HID ballast lighting circuits, that is, the driving circuit mostly use...

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Abstract

The application discloses a driving circuit and a switching power supply. The driving circuit coupled to a light source comprises a pulse trigger circuit, a transformer and a relay. A first input terminal of the transformer is connected to a power supply voltage; a second input terminal of the transformer is connected with the pulse trigger circuit; a first output terminal of the transformer is connected with a first end of the relay; a second output terminal of the transformer is connected with a second end of the relay; a first end of a light source is connected with the second output terminal of the transformer; and a second end of the light source is coupled to the first output terminal of the transformer. When the light source works, the relay is connected and the working current of the light source flows through the relay. Therefore, the circuit loss can be reduced and the conversion efficiency can be improved; the volume and weight as well as the cost of the driving circuit canbe reduced to realize miniaturization; and a problem that the transformer makes audio noises due to the low-frequency commutation is solved.

Description

technical field [0001] The present application relates to the technical field of switching power supplies, in particular to a driving circuit and a switching power supply. Background technique [0002] With the increasing shortage of power resources, the traditional light bulb mode has failed to achieve the purpose of energy saving and emission reduction. In this case, HID lamps and other light sources are more and more widely used. HID light is an excellent light source with high efficiency and energy saving, but it has a defect, that is, it takes about 2-3 minutes to turn on the power under normal circumstances before the light can slowly light up, sometimes when there is a sudden power failure and the power supply is restored immediately It takes 10-20 minutes to light up again, and it cannot be turned on at one point like incandescent lamps and halogen lamps, which is very unsuitable for occasions that require instant start lighting. [0003] The inventor of the present...

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Application Information

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IPC IPC(8): H05B41/04H05B41/18
CPCH05B41/04H05B41/18
Inventor 徐志望陈云辉叶跃明陈高江
Owner FUJIAN RAYNEN TECH
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