US 12,267,923 B2
Control circuit for bypassing diode current and control method
Chuan Xiao, Shenzhen (CN)
Assigned to SHENZHEN INJOINIC TECHNOLOGY CO., LTD., Shenzhen (CN)
Appl. No. 18/011,527
Filed by SHANGHAI HUIRUI SEMICONDUCTOR TECHNOLOGY CO., LTD., Shanghai (CN)
PCT Filed Sep. 9, 2020, PCT No. PCT/CN2020/114133
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2022/000774, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 202010608456.1 (CN), filed on Jun. 29, 2020; and application No. 202021235241.1 (CN), filed on Jun. 29, 2020.
Prior Publication US 2023/0284353 A1, Sep. 7, 2023
Int. Cl. H05B 45/40 (2020.01); H05B 45/345 (2020.01)
CPC H05B 45/345 (2020.01) [H05B 45/40 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A control circuit for bypassing a diode current, wherein the control circuit comprises: a main module, a diode-current sensing module, a driving module, and a current threshold module;
wherein the main module comprises a main switching transistor and a main diode, wherein the main diode is connected in parallel with the main switching transistor, and connected to a source and a drain of the main switching transistor;
wherein the diode-current sensing module is connected to two ends of the main diode, and is for sensing a current flowing through the main diode to generate a sensing current;
wherein the driving module is connected to an output terminal of the diode- current sensing module and a gate of the main switching transistor respectively, and is for generating a driving current proportional to the sensing current to drive the main switching transistor to be turned on;
wherein the main module, the diode-current sensing module, and the driving module form a negative feedback loop to reduce the current flowing through the main diode to a preset value; and
wherein the current threshold module is connected between the diode-current sensing module and the driving module, for comparing the sensing current with a preset threshold current, turning off the driving module when a magnitude of the sensing current is less than that of the preset threshold current, and turning on the driving module when the magnitude of the sensing current is greater than that of the preset threshold current.