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Power converter

A technology of power converters and comparators, applied in output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve the problems of increasing system volume, increasing conversion loss, reducing work efficiency, etc. The effect of reducing system volume, facilitating drive control and improving work efficiency

Pending Publication Date: 2020-05-12
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the constant current output circuit, the two-stage power conversion increases the conversion loss and reduces the working efficiency
At the same time, the two-level power stage circuit requires two magnetic components, which increases the volume of the system and is not conducive to miniaturization

Method used

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Embodiment 2

[0112] The first module 26 in the second embodiment samples the first sampling signal representing the positive terminal voltage of the LED to determine whether the LED is short-circuited or open-circuited.

[0113] The first module 26 in the second embodiment is as Figure 7 As shown, the first module 26 includes a voltage sampling circuit 261 and a second module 262, the voltage sampling circuit 261 is used to sample the first sampling signal V11 representing the positive terminal voltage of the LED, and the second module receives the The first sampling signal V11 is used to determine whether the LED is short-circuited or open-circuited.

[0114] The voltage sampling circuit 261 includes a resistor R3 and a resistor R4, and the resistor R3 and the resistor R4 are connected in series Figure 6 In the second embodiment shown, between the positive terminal of the LED and the ground potential, the first sampling signal V11 is the common terminal voltage of the resistor R3 and t...

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PUM

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Abstract

The invention discloses a power converter. A secondary side switching tube is connected in series with a constant current output circuit; meanwhile, when a primary side switching tube is turned off and the secondary side switching tube is turned on, a follow current completely flows through the secondary side winding of the constant current output circuit; when the secondary side switching tube isturned off, the follow current flows through the secondary side windings of other output circuits; therefore, time-sharing follow current of the constant-current output circuit and the constant-voltage output circuit in each switching period is realized, multi-path constant-current / constant-voltage output is realized on the premise of one-time power conversion, the working efficiency is improved,only one group of magnetic elements is needed, and the system size is reduced. Moreover, the output end of the constant-current output branch is connected with an LED. One end of the LED is groundedto facilitate sampling of voltage on the LED to judge whether the LED is short-circuited or open-circuited or not, one end of the sampling resistor is grounded to facilitate current sampling, and onepower end of the secondary side switching tube is grounded through the sampling resistor to facilitate driving control of the secondary side switching tube.

Description

technical field [0001] The present invention relates to the field of power electronics, more specifically, to a power converter. Background technique [0002] In the prior art, power supplies used in LED backlight displays usually have multiple outputs, at least one constant current output provides driving current for LED loads, and at least one constant voltage output supplies power to the system or other loads. [0003] figure 1 It is a schematic circuit diagram of a power converter with constant voltage and constant current multiple outputs in the prior art. Such as figure 1 As shown, the power converter 1 with multiple outputs realizes multiple outputs through multiple secondary windings of the transformer. Each secondary winding corresponds to an output circuit, and in the constant current output circuit, the secondary winding Ns2 is coupled with the primary winding Np. Since the primary switching tube Q1 connected in series with the primary winding is turned on and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/335H05B45/345H05B45/382H05B45/50
CPCH02M1/00H02M3/33561H02M3/33576H02M1/009H02M3/156H02M1/007H05B45/38H05B45/382H05B45/385H05B45/34H05B45/345H02M1/08
Inventor 黎坚陈伟
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD