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Method and device for short circuit protection of half-bridge resonant converter

A half-bridge resonance and short-circuit protection technology, used in emergency protection circuit devices, output power conversion devices, and conversion equipment with intermediate conversion to AC, can solve the problems of PCB layout drawing board difficulties, occupying space, etc., to achieve device The effect of reducing and increasing power density

Active Publication Date: 2013-07-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the requirements of high power density, the additional primary current sampling unit (generally implemented by current transformers) takes up a lot of space, and after considering the safety distance, it causes certain problems for PCB layout and drawing board. difficulty

Method used

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  • Method and device for short circuit protection of half-bridge resonant converter
  • Method and device for short circuit protection of half-bridge resonant converter
  • Method and device for short circuit protection of half-bridge resonant converter

Examples

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Effect test

Embodiment 1

[0062] This embodiment provides a short-circuit protection method for a half-bridge resonant converter, such as figure 2 shown, including:

[0063] Step 101: Detect the secondary current signal of the half-bridge resonant converter, and convert the detected secondary current signal into a corresponding first sampling voltage signal;

[0064] Step 102: Judging whether wave-by-wave protection is required according to the first sampled voltage signal, if yes, execute step 103; otherwise, execute step 104:

[0065] Step 103: Forcibly blocking the driving signal of the half-bridge resonant converter within a preset period;

[0066] Step 104: Do not process.

[0067] The short-circuit protection method of the half-bridge resonant converter in this embodiment only realizes the peak wave-by-wave protection through the secondary side current sampling to realize the function of short-circuit protection; the short-circuit protection method of this embodiment is used when the half-brid...

Embodiment 2

[0098] Such as Figure 7 As shown, this embodiment provides a short-circuit protection device for a half-bridge resonant converter, including: a current sampling circuit 701, a judging circuit 702 and a drive control circuit 703;

[0099] The current sampling circuit 701 is used to detect the secondary current signal of the half-bridge resonant converter, and convert the detected secondary current signal into a corresponding first sampling voltage signal;

[0100] The judging circuit 702 is used to judge whether wave-by-wave protection is required according to the first sampled voltage signal;

[0101] The driving control circuit 703 is used for forcibly blocking the driving signal of the half-bridge resonant converter within a preset period when the judging result of the judging circuit is that wave-by-wave protection is required.

[0102] Figure 7 The short-circuit protection device in the circuit does not need the primary side current sampling, but directly uses the seco...

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Abstract

The invention discloses a method and a device for short circuit protection of a half-bridge resonant converter. The method for the short circuit protection of the half-bridge resonant converter comprises the steps of detecting a secondary side current signal of the half-bridge resonant converter, and converting the detected secondary side current signal into a corresponding first sampling voltage signal; and judging whether wave chasing protection needs to be carried out according to the first sampling voltage signal, and when the wave chasing protection needs to be carried out, blockading a driving signal of the half-bridge resonant converter in a forcible mode in a preset period. The method for the short circuit protection of the half-bridge resonant converter is capable of carrying out the short circuit protection on the half-bridge resonant converter, and satisfying the requirement for increasing the power density of the half-bridge resonant converter at the same time.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a short-circuit protection method and device for a half-bridge resonant converter. Background technique [0002] High power density is an important development trend of power electronic products, especially communication power products. The half-bridge LLC resonant DC / DC topology has outstanding advantages in terms of conversion efficiency and power density for low and medium power levels, so it is widely used in communication power supply products. With the development of products, it is more and more difficult to increase the power density. In addition to the production of new devices and new processes, reducing devices is the primary means. [0003] At present, the industry is targeting half-bridge LLC resonant DC / DC converters, such as figure 1 As shown, it is mainly completed by the sampling of the peak value circuit on the primary side and the current limiting circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10
CPCH02H7/10H02M3/28H02M3/3376H02M1/32Y02B70/10H02M1/0058H02H7/1213H02M3/33546
Inventor 郭晓亮鲍胜华王陶
Owner ZTE CORP
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