US 9,812,857 B2
Short-circuit protection method and device for a half-bridge resonant converter
Xiaoliang Guo, Shenzhen (CN); Shenghua Bao, Shenzhen (CN); and Tao Wang, Shenzhen (CN)
Assigned to XI'AN ZHONGXING NEW SOFTWARE CO. LTD., Xi'An (CN)
Appl. No. 14/762,974
Filed by ZTE CORPORATION, Shenzhen, Guangdong (CN)
PCT Filed Mar. 11, 2014, PCT No. PCT/CN2014/073248
§ 371(c)(1), (2) Date Jul. 23, 2015,
PCT Pub. No. WO2014/139414, PCT Pub. Date Sep. 18, 2014.
Claims priority of application No. 2013 1 0078294 (CN), filed on Mar. 12, 2013.
Prior Publication US 2016/0172843 A1, Jun. 16, 2016
Int. Cl. H02H 7/122 (2006.01); H02H 7/12 (2006.01); H02M 3/337 (2006.01); H02M 1/32 (2007.01); H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02H 7/1213 (2013.01) [H02M 1/32 (2013.01); H02M 3/3376 (2013.01); H02M 3/33546 (2013.01); H02M 2001/0058 (2013.01); Y02B 70/1433 (2013.01); Y02B 70/1491 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for short-circuit protection for a half-bridge resonance converter, comprising:
detecting a secondary-side current signal of the half-bridge resonance converter by using a device located at a secondary side of the half-bridge resonance converter;
converting the secondary-side current signal into a first sampling voltage signal;
determining whether a cycle-by-cycle protection is required in accordance with the first sampling voltage signal; and
compulsorily blocking a driving signal of the half-bridge resonance converter during a preset cycle when the cycle-by-cycle protection is required,
wherein the determining whether the cycle-by-cycle protection is required in accordance with the first sampling voltage signal comprises:
performing difference and amplification processing on the first sampling voltage signal;
comparing a voltage value of the first sampling voltage signal after the difference and amplification processing with a preset voltage value; and
determining that the cycle-by-cycle protection is required when the voltage value of the first sampling voltage signal after the difference and amplification processing is greater than the preset voltage value,
wherein the method further comprises:
processing the first sampling voltage signal and acquiring an average voltage signal corresponding to an average secondary-side current signal;
generating a given voltage signal with a fixed voltage value when determining that the cycle-by-cycle protection is required in accordance with the first sampling voltage signal;
acquiring a loop control signal according to the average voltage signal and the given voltage signal; and
controlling a size of the driving signal of the half-bridge resonance converter according to the loop control signal.