Charge Pump Feedback Control for Voltage Stability
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Solution Overview
Problem
Conventional charge pumps using open loop schema face issues with output voltage stability when load impedance changes, leading to either insufficient or excessive output voltage, while closed loop schema charge pumps struggle with precise instantaneous adjustments and stability due to comparator-based feedback systems.
Innovation Solution
A charge pump feedback control device and method incorporating a compensation unit, modulation unit, and phase control unit to stabilize output voltage and adapt to load changes, using error signals and modulation signals to control switch operations in the charge pump unit, employing pulse frequency modulation or pulse skipping modulation to generate phase signals for stable output voltage across varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open loop schema is used with fixed switching frequency, then device complexity is reduced, but output voltage stability deteriorates when load impedance changes
Solution Approach 1:
The patent implements a feedback control mechanism where the output voltage is continuously monitored and compared against a reference value. The error signal generated from this comparison is used to dynamically adjust the switching frequency of the charge pump, ensuring output voltage stability despite load impedance changes. This resolves the contradiction by introducing feedback while maintaining relative simplicity through direct error-proportional frequency adjustment.
Solution Approach 2:
The patent makes the switching frequency dynamic rather than fixed. The switching frequency automatically adjusts in response to load changes and output voltage variations, allowing the system to adapt to different operating conditions. This dynamic adjustment resolves the contradiction between simplicity and stability by enabling the system to maintain optimal performance across varying loads without complex additional circuitry.
2Stability of the object's composition
If closed loop schema with comparator-based feedback is used, then output voltage stability is improved, but response speed to load changes deteriorates
Solution Approach 1:
The patent extracts the essential feedback function from complex comparator-based systems and implements a simplified error detection mechanism. By directly monitoring the output voltage and generating an error signal proportional to the deviation from the reference voltage, the system achieves rapid response to load changes without the delays associated with traditional comparator circuits. This resolves the contradiction by maintaining stability through feedback while eliminating the response speed bottleneck.
3Device complexity
If fixed switching frequency is used, then device complexity is reduced, but adaptability to load changes deteriorates
Solution Approach 1:
The patent transforms the fixed switching frequency into a dynamic parameter that automatically adapts to load changes. The switching frequency is modulated in direct proportion to the error signal, enabling the system to respond to varying load conditions. This resolves the contradiction by providing load adaptability through simple frequency modulation rather than complex control logic.
Solution Approach 2:
The patent changes the switching frequency parameter dynamically based on load conditions and output voltage deviations. By adjusting this critical parameter in response to system state changes, the charge pump maintains optimal performance across a wide range of load impedances. This resolves the contradiction between simplicity and adaptability by using parameter modulation rather than structural complexity.
Data Source
AI summary
Charge pump feedback control device and method are provided. The device is coupled to the charge pump unit which receives an input voltage so as to generate an output voltage and has switches and at least one capacitor, the device includes: a compensation unit, a modulation unit, and a phase control unit. The compensation unit receives the output voltage, compensates the output voltage for stability, and generates an error signal. The modulation unit receives the error signal, modulates the error signal, and correspondingly generates a modulation signal. The phase control unit receives the modulation signal so as to generate phase signal, and controls the plurality of switches of the charge pump unit according to the plurality of phase signal so as to generate the output voltage through the input voltage charging/discharging at least one capacitor of the charge pump unit.