Power Regulator Pseudo Constant Frequency Control
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Solution Overview
Problem
Conventional power regulation methods using constant on-time control result in poor stability, increased design complexity, and higher costs due to variable switching frequency, which complicates filter design and interference suppression.
Innovation Solution
A power regulator employing a pseudo constant frequency control scheme that utilizes a constant time control method, incorporating a power stage, regulation signal generator, constant time generator, and logic/driving circuit to modulate switching devices, maintaining a pseudo constant operation frequency through feedback and pulse width modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant on-time control scheme is used, then the on-time of switching device is fixed, but the switching frequency becomes variable leading to poor stability and increased design complexity
Solution Approach 1:
The patent implements dynamic adjustment of the on-time period based on the duty cycle of the PWM control signal. The constant time generator receives the PWM signal and generates a constant time signal with an on-time period that is dynamically adjusted according to the duty cycle, allowing the system to maintain stable switching frequency while adapting to varying load conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the constant time generator continuously monitors the PWM control signal duty cycle and adjusts the on-time period accordingly. This closed-loop feedback ensures that the switching frequency remains stable by compensating for variations in real-time based on the actual operating conditions.
2Ease of operation
If constant on-time control scheme is used, then the on-time is fixed, but additional filter and interference suppression is required increasing design complexity and cost
Solution Approach 1:
By dynamically adjusting the on-time period based on duty cycle feedback, the patent achieves pseudo constant frequency operation that reduces the need for complex EMI filters and interference suppression circuits. The adaptive control inherently minimizes frequency variations that would otherwise require additional filtering components.
3Adaptability or versatility
If variable switching frequency is used, then the system can adapt to different conditions, but stability deteriorates and design complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of the on-time period based on the duty cycle of the PWM control signal. The constant time generator receives the PWM signal and generates a constant time signal with an on-time period that is dynamically adjusted according to the duty cycle, allowing the system to maintain stable switching frequency while adapting to varying load conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the constant time generator continuously monitors the PWM control signal duty cycle and adjusts the on-time period accordingly. This closed-loop feedback ensures that the switching frequency remains stable by compensating for variations in real-time based on the actual operating conditions.
Data Source
AI summary
Methods and circuits related to power regulation are disclosed. In one embodiment, a power regulator for converting an input electrical signal to an output electrical signal to supply power to a load, can include: (i) a power stage having switching devices and a filter; (ii) a regulation signal generator for the switching devices that includes a feedback circuit and a PWM, the feedback circuit receiving an output signal from the power stage, the PWM receiving an output from the feedback circuit, and generating a PWM control signal; (iii) a constant time generator receiving the PWM control signal and generating a constant time signal based on the PWM control signal duty cycle; and (iv) a logic/driving circuit receiving the PWM control signal and the constant time signal, and controlling operation of the switching devices to modulate the output signal from the power stage, and maintaining a pseudo constant operation frequency.