Joulwatt Technology Co., Ltd.

Joulwatt Technology (shenzhen) Co., Ltd.

Aimin Xu

Pitleong Wong

Shengfeng Li

Yin Zhou

Zhirong Chen

Disclosed is a power conversion circuit for quick response and a switching power supply, wherein an error compensation signal is obtained according to a sampled signal representing an output feedback signal or an average current through the inductor. A PWM control signal is generated according to the error compensation signal, a ramp signal, and a proportional signal, and is used to control switching operations of a main power switch transistor, the proportional signal is proportional to an input voltage or/and an output voltage, thus the system can quickly respond to transient change of the input voltage or the output signal and provide stable output. Output voltage information or/and input voltage information can be fed back to a control loop, thus the system can quickly obtain a switching duty cycle which allows the system to operate in a state close to steady, and dynamic response speed of the system is fast.

Power conversion circuit for quick response and switching power supply

Disclosed is a switch protection circuit and a power converter, configured to set upper and lower limit-value current signals which can be adjusted along with an input voltage, so that instantaneous power of a main power switch can be prevented from being too high, and the main power switch can always be operated within a safe operating range, thereby solving the problem that the power converter is easy to be damaged in applications under a high-current circumstance.

Switch protection circuit and power converter suited for different input voltage ranges

A control method of a switching circuit, a control circuit of the switching circuit and the switching circuit are provided. The control circuit includes a slope buffer and a first operational amplifier. The slope buffer receives a first voltage reference, and controls slopes of a rising edge and a falling edge to generate a second voltage reference. The first operational amplifier receives an output feedback voltage and a reference voltage, and performs an operational amplification to obtain a compensation voltage. When the first voltage reference has the falling edge, the reference voltage is coupled to the first voltage reference through a first switch, and the second voltage reference is coupled to an output voltage through a second switch. When the first voltage reference has the rising edge, the reference voltage is coupled to the second voltage reference through a third switch.

Control method of switching circuit, control circuit of switching circuit, and switching circuit

An inductive current simulation circuit of a switching circuit, an inductive current simulation method of the switching circuit, and a switched-mode power supply are provided. The inductive current simulation method includes the following steps: based on an error amplification circuit, performing, by the error amplification circuit, an error amplification on a first sampling signal representing a current of a synchronous rectifier and a second sampling signal representing an inductive current simulation signal when the synchronous rectifier is turned on to obtain an error amplification signal; and reconstructing an inductive current according to the error amplification signal when the synchronous rectifier is turned on and a first current when a main power transistor is turned on to obtain the inductive current simulation signal.

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Hangzhou, China

Aimin Xu