US 12,107,505 B1
Auxiliary power source circuit having ultra-low standby power consumption
Jianxiong Zheng, Guangdong (CN); Jianguo Bai, Guangdong (CN); and Likuan Deng, Guangdong (CN)
Assigned to SHENZHEN UU GREEN POWER CO., LTD., Shenzhen (CN)
Appl. No. 18/689,093
Filed by SHENZHEN UU GREEN POWER CO., LTD., Guangdong (CN)
PCT Filed Sep. 6, 2021, PCT No. PCT/CN2021/116680
§ 371(c)(1), (2) Date Mar. 5, 2024,
PCT Pub. No. WO2023/029040, PCT Pub. Date Mar. 9, 2023.
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33515 (2013.01) [H02M 1/0032 (2021.05); H02M 1/0048 (2021.05); H02M 3/33523 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An auxiliary power source circuit having ultra-low standby power consumption, comprising a transformer, a PWM control chip, a battery power source and a first switch tube which are arranged at a primary side of the transformer, and an output module which is arranged at a secondary side of the transformer;
wherein the auxiliary power source circuit having ultra-low standby power consumption further comprises a voltage division and adjustment module, a first adjustment module, a second adjustment module, and a control module;
a first terminal of the voltage division and adjustment module is connected with the battery power source to receive an input voltage, a second terminal of the voltage division and adjustment module is grounded, and a third terminal of the voltage division and adjustment module is connected with a voltage terminal of the PWM control chip;
a first terminal of the first adjustment module is connected with the voltage terminal of the PWM control chip, a second terminal of the first adjustment module is connected with a primary coil of the transformer, and a third terminal of the first adjustment module is grounded;
a first terminal of the second adjustment module is connected with a secondary coil of the transformer, a second terminal of the second adjustment module is connected with a first terminal of the control module and a feedback control terminal of the PWM control chip, and a third terminal of the second adjustment module is grounded;
a second terminal of the control module is connected with the battery power source, a third terminal of the control module is grounded, and a fourth terminal of the control module is connected with the voltage terminal of the PWM control chip;
the control module is configured to calculate a minimum insufficient voltage of the battery power source according to a minimum startup voltage of the PWM control chip and a shutdown voltage of the PWM control chip, as well as a module parameter of the voltage division and adjustment module, and configured to select an insufficient voltage of the battery power source based on the minimum insufficient voltage of the battery power source and a battery power source voltage;
the control module is further configured to adjust a module parameter of the first adjustment module and a module parameter of the second adjustment module, so as maintain power supply time of the control module until a power supply voltage of the PWM control chip drops to power off the PWM control chip;
during an operation of the auxiliary power source circuit, the control module is further configured to acquire the input voltage and control a discharge speed of the power supply voltage when the input voltage is lower than the insufficient voltage of the battery power source; wherein the control module and the PWM control chip are powered off, after a discharge of the power supply voltage is completed;
the auxiliary power source circuit is configured to re-start working only when the battery power source is re-charged to supply the power supply voltage which is greater than the minimum startup voltage of the PWM control chip, after the input voltage drops to the insufficient voltage of the battery power source.