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LCD clamping single-tube forward converter and electronic equipment

A technology of forward converter and clamp unit, which is applied in the direction of conversion equipment, electrical components, and output power conversion devices with intermediate conversion to AC, which can solve the problems of increasing hidden costs and system interference, and achieve effective utilization , Elimination of reverse impact current interference, easy voltage regulation and modular design

Inactive Publication Date: 2020-02-21
东莞南方半导体科技有限公司
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Problems solved by technology

[0003] Since the single-transistor forward converter is often used as an auxiliary power supply for secondary conversion, its power supply U in ' is usually the working power supply of the entire large system, so the power supply U in 'The reverse current impact will cause interference to the system. In the actual system, an additional filter circuit is usually required to eliminate this interference, adding additional hidden costs

Method used

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  • LCD clamping single-tube forward converter and electronic equipment
  • LCD clamping single-tube forward converter and electronic equipment
  • LCD clamping single-tube forward converter and electronic equipment

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] In one embodiment, an LCD clamped single-transistor forward converter 10 is provided, such as figure 2 As shown, the LCD clamp single-tube forward converter includes a forward transformer Tr 1, a clamp magnetic reset circuit 101 and a unidirectional switch circuit 102, wherein the primary winding of the forward transformer Tr 1 (its excitation inductance is L m ) the first end is connected to the positive pole of a preset power supply, the second end of the primary winding of the forward transformer Tr 1 is connected to the negative pole of the preset power supply through a one-way switch c...

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Abstract

The invention relates to an LCD clamping single-tube forward converter and electronic equipment. The LCD clamping single-tube forward converter comprises a forward transformer, a one-way switching circuit and a clamping magnetic reset circuit, wherein the clamping magnetic reset circuit comprises a coupling capacitor, a first diode and a flyback transformer, the negative electrode of the first diode is connected with the positive electrode of a preset power supply, the positive electrode of the first diode is connected with the first end of a primary winding of the flyback transformer and is connected with the second end of a primary winding of the forward transformer through the coupling capacitor, the second end of the primary winding of the flyback transformer is connected with the negative electrode of the preset power supply, and a secondary winding of the flyback transformer is used for connecting a load. According to the invention, the effective utilization of magnetic reset energy of the forward transformer can be realized, and the reverse impact current interference to the input power supply end is eliminated. The secondary side of the forward transformer outputs to the load during the conduction period of the one-way switching circuit, so that the output voltage ripple of the converter is small, the filtering parameter is small, and the voltage stabilization regulation and modular design are easy.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to an LCD clamped single-tube forward converter and electronic equipment including the LCD clamped single-tube forward converter. Background technique [0002] The LCD magnetic reset single-tube forward converter is a common forward converter at present, and its circuit structure is as follows: figure 1 shown. Among them, when the switch S' is turned on, the preset power supply U in ' for the magnetizing inductance L m 'Charging, the magnetizing inductance L m 'Store magnetic field energy. Capacitance C c ' for inductance L c 'Charging, the inductance L c 'Store magnetic field energy. When the switch S' is turned off, the magnetizing inductance L m 'Need to discharge, for the capacitor C c ' and C s 'Charge. At this time the magnetizing inductance L m 'The magnetic field can be converted into capacitance C c ' and C s 'The electric field energy, this process ...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M1/32
CPCH02M1/32H02M3/28
Inventor 徐海波张胜发阳志超李锡光
Owner 东莞南方半导体科技有限公司
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