Charge Pump Control Circuit Without Oscillator
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Solution Overview
Problem
Conventional charge pump control circuits occupy significant chip area and consume high power due to the presence of an oscillator, which also results in trigger delays for the charge pump.
Innovation Solution
A charge pump control circuit that eliminates the need for an oscillator by using a logic combination circuit to generate a clock pulse signal, incorporating a comparator, feedback circuit, and reference voltage generating circuit, along with a protection circuit to ensure timely and accurate clock signal provision to the charge pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oscillator is used in the charge pump control circuit, then the clock pulse signal can be generated, but the chip area is occupied and power consumption is increased
Solution Approach 1:
The patent extracts and removes the oscillator component from the charge pump control circuit. Instead of using a traditional oscillator to generate clock signals, the invention uses a charge pump control circuit that generates clock signals through its inherent charging and discharging operations, thereby eliminating the oscillator and reducing chip area occupation
Solution Approach 2:
The charge pump control circuit is designed to perform multiple functions: it not only controls the charge pump operation but also generates the necessary clock pulse signals. This multi-functionality eliminates the need for a separate oscillator component, reducing overall circuit complexity and chip area
2Reliability
If an oscillator is used in the charge pump control circuit, then the clock pulse signal can be generated, but power consumption is increased
Solution Approach 1:
The oscillator component is removed from the circuit, eliminating its power consumption. The clock signal generation function is transferred to the charge pump control circuit, which generates clock signals using the energy already present in the charging and discharging process, thereby reducing overall power consumption
Solution Approach 2:
The charge pump control circuit generates its own clock signals using its internal charging and discharging operations, without requiring an external oscillator. This self-service approach eliminates the additional power consumption that would be required by a separate oscillator component
3Reliability
If an oscillator is used in the charge pump control circuit, then the clock pulse signal can be generated, but the trigger delay of the charge pump increases
Solution Approach 1:
The charge pump control circuit generates clock signals in advance during its normal charging and discharging operations, so that clock signals are already available when needed for triggering the charge pump. This eliminates the settling time required by oscillators and reduces trigger delay
Solution Approach 2:
The clock signal generation is integrated into the continuous charging and discharging operation of the charge pump control circuit. Since the charging and discharging process is continuous, the generated clock signals are also continuous and immediately available for triggering, eliminating delays associated with oscillator startup and settling
Data Source
AI summary
A charge pump control circuit is provided in embodiments of the present disclosure, and the charge pump control circuit includes: a charge pump, having a clock interface; a feedback circuit, configured to sample an output voltage of the charge pump to obtain a sampling voltage; a reference voltage generating circuit, having an output terminal outputting a reference voltage; and a comparator, configured to compare the sampling voltage with the reference voltage; wherein the charge pump control circuit further includes: a logic combination circuit, wherein an input terminal of the logic combination circuit is coupled with an output terminal of the comparator, and the logic combination circuit is configured to generate a clock pulse signal according to a comparison result outputted by the comparator, and the clock pulse signal is transmitted to the clock interface of the charge pump.