Byd Company Limited

Shenzhen Byd Auto R&d Company Limited

Byd Semiconductor Company Limited

Sanechips Technology Co., Ltd.

Wenqing Wang

Jing Liu

Tong Wang

Yongjun Hou

Xiaohua Yang

Yuming Feng

Chuntian Yu

Jirui Zeng

An under voltage protection circuit includes a secondary-side output module and a primary-side input module. The secondary-side output module includes: an under voltage determination unit, configured to compare a voltage of the secondary-side output module with a preset voltage, where a first control signal is outputted when the voltage is greater than or equal to the preset voltage; and a second control signal is outputted when the voltage is less than a preset voltage; and a pulse signal generation unit, configured to transmit a periodic first pulse signal according to the first control signal and a second pulse signal according to the second control signal, where a pulse width of the second pulse signal is greater than that of the first pulse signal. The primary-side input module is configured to determine a state of the secondary-side output module according to the first pulse signal and the second pulse signal.

Under voltage protection circuit and device

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

A control integrated circuit for controlling a switch power supply, including: a voltage collecting module, configured to collect a feedback voltage based on an output voltage of the switch power supply; an error amplifying module, configured to compare the feedback voltage with a reference voltage and generate an error voltage; a time collecting module, configured to obtain a degaussing time signal based on the feedback voltage; and a constant voltage and current module, configured to collect a peak current feedback signal of a switch transistor, generate a control signal based on the error voltage, the degaussing time signal and the peak current feedback signal, wherein the control signal is for controlling an operating frequency and a duty ratio of the switch transistor, and control the switch transistor according to the control signal.

Control integrated circuit of a switch power supply and a switch power supply using the same

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Shenzhen, China

Wenqing Wang