Byd Company Limited

Shenzhen Byd Auto R&d Company Limited

Yongjun Hou

Wenqing Wang

Xiaohua Yang

Haiquan Zhang

Wenhui Ye

The invention discloses a switching power supply, a primary control chip and a loop compensation device thereof. The loop compensation device comprises: an error amplifier; a switching logic gate, wherein the input end of the switching logic gate is connected with the output end of the error amplifier; a loop compensation capacitor, wherein one end of the loop compensation capacitor is connected with the output end of the switching logic gate, and the other end of the loop compensation capacitor is grounded; and a delay generation circuit, wherein the output end of the delay generation circuit is connected with the control end of the switching logic gate, and the delay generation circuit is used for outputting a valid switching control signal within a preset time after a power switch of the switching power supply is turned off to control the switching logic gate in a turn-on state, so that the loop compensation capacitor is charged/discharged by means of an error amplification signal outputted from the error amplifier. With the loop compensation device, the problem that the output ripple from the switching power supply is too large can be solved, and the loop stability is ensured.

Switching power supply, primary control chip and loop compensation device thereof

The present disclosure provides a control apparatus of a switch-mode power supply and a switch-mode power supply. In the control apparatus of the present disclosure, a short-circuit protection module is set, and when a switching transistor of the switch-mode power supply is turned on, and the short-circuit protection module detects that a voltage across a current sensing resistor of the switch-mode power supply is less than a predetermined value within a predetermined period, that is, the current sensing resistor is short-circuited, the short-circuit protection module generates a short-circuit protection signal, and a driving controller controls the switching transistor to turn off according to the protection signal, thereby switching off the control apparatus, preventing breakdown of the switch-mode power supply, and avoiding erroneous protection.

Switch-mode power supply and control having protection from a short-circuited current sensing resistor

An integrated circuit controls a switch power supply including: a primary feedback terminal, a primary feedback sampling module, an error amplifying module, a first control module, a secondary control module, a secondary feedback terminal, a second control module, and a driving module; the second control module, connected with the first control module and the secondary control module, respectively, and configured to generate a logic control signal according to the constant voltage control signal, or according to the secondary control signal and the constant voltage control signal; and the driving module, connected with the second control module and configured to generate a driving signal according to the logic control signal and to output the driving signal.

Integrated circuit that controls switch power supply and switch power supply

A quasi-resonant device for a switching power, a quasi-resonant system for a switching power, and a method for a quasi-resonant control of a switching power are provided. The quasi-resonant device includes: a degaussing time sampling module, configured to sample a degaussing time Tof a secondary coil of the transformer according to a feedback signal output by the switching power after the switching tube is turned off; a valley sampling module, configured to sample a resonant valley signal of the quasi-resonant module according to the feedback signal; a time producing module, configured to produce a time T with a predetermined ratio D by processing the degaussing time T; and a logic processing module, configured to obtain a first valley signal after the time T, and the first valley signal works as a switching signal T' to turn on the switching tube.

Growing community of inventors

Shenzhen, China

Yongjun Hou