A pseudo constant frequency control circuit
By adjusting the on-time and off-time of the switching transistors in the Boost converter circuit using a pseudo-constant frequency control circuit, the problem of unstable switching frequency caused by load changes is solved, and the stability of the switching frequency is achieved, making it suitable for applications with high frequency requirements.
CN117175905BActive Publication Date: 2026-06-26SHENZHEN INJOINIC TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN INJOINIC TECH
- Filing Date
- 2023-08-28
- Publication Date
- 2026-06-26
Smart Images
Figure CN117175905B_ABST
Abstract
The embodiment of the present application discloses a kind of pseudo constant frequency control circuits, circuit includes opening time control module, turn-off time control module and logic drive module, turn-off time control module includes first capacitor.Opening time control module is used to output first control signal, when the voltage value of first voltage signal reaches first voltage value, the voltage value of first control signal is from low level to high level, turn-off time control module is used to output second control signal, when the second voltage signal output by first capacitor reaches preset voltage threshold, the voltage value of second control signal is from low level to high level, logic drive module is used to control first switch tube to be turned off when the voltage value of first control signal is from low level to high level, and it is used to control first switch tube to be turned on under the condition that the voltage value of second control signal is from low level to high level.The embodiment of the present application can improve the stability of the switching frequency of power switch tube when boost conversion circuit works.
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