Charge Pump Feedback Control for Stable Output Voltage
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Solution Overview
Problem
Charge pump circuits experience unstable output voltages due to fluctuations in the supply voltage, leading to output instability.
Innovation Solution
A charge pump circuit with a regulating circuit that generates a regulating signal based on the output voltage and a switch control signal to control the on-resistance of a switching transistor, stabilizing the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the supply voltage fluctuates with a relatively large variation range, then the charge pump circuit can adapt to different voltage conditions, but the output voltage will fluctuate in tandem with the supply voltage, leading to occurrence of output instability
Solution Approach 1:
The patent implements a feedback mechanism where the output voltage is detected and compared with a reference voltage. The error signal generated from this comparison is fed back to the control terminal of the switching transistor to adjust its on-resistance. This closed-loop feedback system automatically compensates for supply voltage fluctuations, maintaining stable output voltage while adapting to different supply conditions.
Solution Approach 2:
The patent dynamically changes the on-resistance parameter of the switching transistor based on the feedback error signal. By adjusting the resistance value of the switching transistor in real-time according to the output voltage deviation, the circuit compensates for supply voltage variations and maintains stable output, thus resolving the contradiction between adaptability and stability.
2Reliability
If a regulating circuit is added to control the on-resistance of the switching transistor to stabilize output voltage, then output voltage stability is improved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the switching transistor and its control circuit. The switching transistor not only performs the basic charge pumping function but also acts as a variable resistor whose on-resistance is controlled by the feedback error signal. This multi-functionality approach stabilizes output voltage without requiring separate complex regulation circuits, thus minimizing additional complexity.
Solution Approach 2:
The regulating circuit uses the existing output voltage as its own input for feedback comparison. The error signal generated within the circuit directly controls the switching transistor's on-resistance, creating a self-regulating system. This self-service mechanism stabilizes output voltage using only the circuit's own components and signals, avoiding the need for external complex regulation devices.
Data Source
AI summary
A charge pump circuit and control method for the charge pump circuit. The charge pump circuit has an input port to receive a supply voltage, and an output port to provide an output voltage. The charge pump circuit has a first switching transistor, a first capacitor, and a regulating circuit. The first switching transistor has a first terminal and a second terminal, when the first switching transistor is turned on, a current of the first switching transistor flows from the first terminal to the second terminal. The first capacitor has a first terminal and a second terminal, the first terminal of the first capacitor is coupled to the first terminal or the second terminal of the first switching transistor. The regulating circuit is configured to receive the output voltage and a first switch control signal, and generate a regulating signal to control on and off of the first switching transistor.