Gree Electric Appliances, Inc. of Zhuhai

Yijun Xu

Liang Zhang

Xinchao Peng

Yuming Feng

Yuhua Xie

Jing Wang

Wenjie Yang

Jia Zhou

Jianxun Li

Suibiao Huang

Huiping Yin

Shirong Fan

The present disclosure relates to a frequency modulation device, a switching power supply and a frequency modulation method thereof. The device includes: a waveform generation unit () configured to generate a periodic signal required for performing frequency modulation on a clock signal of a switching power supply to be controlled; a frequency modulation unit () configured to perform voltage-current conversion and arithmetic processing based on the periodic signal to obtain a frequency modulation current required for performing the frequency modulation on the clock signal of the switching power supply to be controlled; and an RC oscillation unit () configured to perform RC oscillation processing based on the frequency modulation current to obtain a frequency oscillation signal as the clock signal of the switching power supply to be controlled.

Frequency modulation device, switching power supply and frequency modulation method thereof

Disclosed is a reference voltage circuit with low temperature drift, including a first voltage unit, a second voltage unit and a K times' amplification unit. The first voltage unit is configured to generate a first voltage, with a first end thereof being grounded. The K times' amplification unit is configured to amplify the first voltage by K times, with a first end thereof being connected to a second end of the first voltage unit, and with a second end thereof being connected to a first end of the second voltage unit, wherein K is a constant greater than zero. The second voltage unit is configured to generate a second voltage, with the first end thereof being connected to a current source circuit, and a second end thereof being connected to a third end of the first voltage unit to serve as an output end of a reference voltage (V).

Reference voltage circuit with low temperature drift

Disclosed are a clock compensation circuit, a clock circuit and a microcontroller. The clock compensation circuit may include: a detection circuit, configured to detect a capacitance control parameter capable of affecting a clock frequency output by a clock circuit; and a control unit, connected with the detection circuit, and configured to adjust a capacitance value of a target capacitor in the clock circuit according to the capacitance control parameter detected by the detection circuit, so as to change the clock frequency output by the clock circuit. With the clock compensation circuit, the clock circuit and the microcontroller, the problem of large fluctuation of a clock frequency output by a clock circuit in the related art is solved.

Clock compensation circuit, clock circuit, and microcontroller

Growing community of inventors

Guangdong, China

Yijun Xu