Title:
SWITCHING POWER SUPPLY SYSTEM EMPLOYING HYSTERETIC MODE CONTROL
Document Type and Number:
WIPO Patent Application WO/2020/199804
Kind Code:
A1
Abstract:
The present application relates to the field of switching power supply, and discloses a switching power supply system employing hysteretic mode control. In the switching power supply system, an error amplifier has a hysteretic design at a later stage thereof, and outputs COMP, which is an amplified signal obtained from a sampling signal of VOUT and a reference voltage, such that an output signal feedback node FB has a reduced amount of operating hysteresis, thereby achieving small output signal ripples. Moreover, a triangular wave signal Ramp is generated by a triangular wave generation circuit, and undergoes a hysteretic comparison with the COMP output by the error amplifier. A slope of the triangular wave signal Ramp is basically unrelated to the voltage at a sampling commutation point SW, such that the operating frequency of the system is mostly unrelated to output current load. The system also has fast transient response speed, and the operating frequency thereof is less affected by system inputs and outputs.
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| WO/2002/027905 | POWER SUPPLY |
Inventors:
MA ZHONGLIANG (CN)
Application Number:
PCT/CN2020/076936
Publication Date:
October 08, 2020
Filing Date:
February 27, 2020
Export Citation:
Assignee:
WUXI INST TECHNOLOGY (CN)
International Classes:
H02M3/157
Foreign References:
| CN109861527A | 2019-06-07 | |||
| CN105958820A | 2016-09-21 | |||
| CN104578774A | 2015-04-29 | |||
| US6147478A | 2000-11-14 | |||
| TW200906056A | 2009-02-01 | |||
| US20180294726A1 | 2018-10-11 |
Attorney, Agent or Firm:
WUXI HUAYUAN PATENT AND TRADEMARK AGENCY (GENERAL PARTNERSHIP) (CN)
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