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Constant-current control circuit for isolated switching power supply

A technology of constant current control circuit and switching power supply, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc. It can solve the problems of complex circuit structure, large PCB area, and large number of components, so as to reduce PCB area, The effect of cost reduction and simple structure

Active Publication Date: 2011-11-23
MAXIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of circuit structure is relatively complex, the number of components used is large, and the PCB area occupied is relatively large, which leads to restrictions in some specific applications and high cost

Method used

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  • Constant-current control circuit for isolated switching power supply
  • Constant-current control circuit for isolated switching power supply
  • Constant-current control circuit for isolated switching power supply

Examples

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Embodiment Construction

[0015] In the embodiment of the present invention, the principle of constant current control when the AC input voltage changes is discussed first. figure 2 It shows the schematic diagram of the isolated switching power supply according to the related art. In the isolated switching power supply, according to energy conservation, there is

[0016] Vo * Io * T = 1 2 * Lp * Idsp p 2 * eff T . . . . . . ( 1 )

[0017] Among them, Vo is the voltage of the output LED. Once the series-parallel relationship of the LED is determined, Vo is a certain value; Io is the average current of the output LED, which is a constant; T is the cycle of the switching power sup...

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PUM

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Abstract

The invention discloses a constant-current control circuit for an isolated switching power supply. The isolated switching power supply comprises a primary part and a secondary part which are coupled by a transformer, wherein the primary part provides input voltages, and the secondary part provides output voltages; the primary part comprises an input voltage detection circuit, a turning-off time control circuit and a power switching tube; the input voltage detection circuit is used for detecting the input voltages; and the turning-off time control circuit is used for adjusting the turning-off time of a power switching tube in accordance with the changes of the input voltages relative to first reference voltages. The constant-current control circuit solves the problems that a circuit in theprior art is limited in some specific applications because the circuit structure is complicated, more components are used and the larger PCB (printed circuit board) area is occupied; and the cost is higher.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a constant current control circuit for an isolated switching power supply. Background technique [0002] According to the angle of use, switching power supply is divided into constant voltage, constant current, constant power and other types. From the perspective of electrical characteristics, it can be divided into two types: isolated type and non-isolated type. For some products with current sensitive characteristics, the switching power supply with isolation and constant current function is a better choice. [0003] In the prior art, the widely used constant current control methods are secondary sampling, feedback, primary control, figure 1 It shows the structure diagram of the constant current control circuit used in the isolated switching power supply in the related art, as figure 1 As shown, the secondary "current sampling circuit" realizes the detection of the ou...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 陈湛
Owner MAXIC TECHNOLOGY CORPORATION
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