Variable voltage variable frequency modulation circuit applicable to switched capacitor voltage stabilizer

Abstract

The invention relates to a variable voltage variable frequency modulation circuit applicable to a switched capacitor voltage stabilizer, and belongs to the technical field of power electronics. A first input end of a load current frequency conversion circuit is connected with an output end of a switched capacitor power level, a second input end is connected with a load power supply, and a periodicsignal with the frequency and the load current which are proportional is generated to a frequency input end of a switch control and drive circuit; an error amplifier amplifies feedback voltage generated by reference voltage and a voltage division circuit, and an output end of the error amplifier is connected with a voltage input end of the switch control and drive circuit; a switch control and drive module generates a correct switch sequence according to an input signal of the frequency input end of the switch control and drive module, and an input signal of a voltage input end of the switchcontrol and drive module is converted into drive voltage of a corresponding switch. Accordingly, the optimized switching frequency and power switch drive voltage can be generated according to the loadcurrent in a self-adaptive mode, and then the switched capacitor voltage stabilizer works at an operating point high in efficiency and low in ripple wave all the time; meanwhile, the performance of the switched capacitor voltage stabilizer under the complex load environment is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a frequency-variable-voltage modulation circuit suitable for a switched capacitor voltage stabilizer. Background technique [0002] Switched capacitor regulators are widely used in applications such as system-on-chip power supply, high-voltage drive, and energy harvesting due to their small size, high efficiency, low electromagnetic interference, and boost and buck capabilities. As a kind of power converter, the switched capacitor regulator is a kind of power converter. Its efficiency and ripple are very important performance indicators, and the modulation mode will have a great impact on the efficiency and ripple of the switched capacitor regulator. more pronounced under load. [0003] The modulation methods of traditional switched capacitor regulators can be divided into linear modulation and PFM pulse frequency modulation. The linear modulation method adjusts the outp...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problem that the modulation mode of the traditional switched capacitor voltage regulator cannot take into account both ripple and efficiency, the present invention proposes a frequency conversion and voltage conversion modulation circuit suitable for the switched capacitor voltage regulator, which provides a stable output voltage for the switched capacitor voltage regulator. At the same time, it can maintain high efficiency and small output voltage ripple in a wide range of output current

Images