Charge Pump Warm-Up Current Reduction via Dynamic Frequency
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Solution Overview
Problem
Charge pump circuits experience high input current spikes during the warm-up phase, which can lead to inefficiencies and potential supply voltage drops, especially in applications requiring simultaneous read and write operations in memory devices.
Innovation Solution
The charge pump circuit operates at a lower frequency during the warm-up mode and smoothly transitions to a higher frequency during the loading mode, reducing input current requirements by configuring diode-connected transistors in parallel to control the VCO bias voltage, allowing for efficient charging without causing supply voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the charge pump charges the output quickly, then the output voltage is reached faster, but an input current spike occurs
Solution Approach 1:
The charge pump dynamically adjusts its operating frequency based on the charging state of the output capacitor. During warm-up mode, it operates at a lower frequency to avoid current spikes, and transitions to a higher frequency during loading mode to meet current demands. This dynamic frequency adjustment resolves the contradiction between fast charging speed and avoiding harmful current spikes.
Solution Approach 2:
The patent changes the operating parameters (frequency) of the charge pump based on different operational phases. By monitoring the charging state and adjusting the frequency parameter accordingly, the system achieves fast charging when needed while preventing harmful current spikes during warm-up, thus resolving the technical contradiction.
2Power
If the charge pump operates at high frequency during warm-up, then voltage is generated faster, but supply voltage drops occur
Solution Approach 1:
The charge pump transitions from a static high-frequency operation to a dynamic frequency adjustment scheme. During warm-up mode when the output capacitor is charging, it operates at a reduced frequency to prevent supply voltage drops. Once the capacitor is charged, it switches to high frequency during loading mode to meet power demands, thus resolving the contradiction between fast voltage generation and preventing supply voltage drops.
Solution Approach 2:
The system performs preliminary charging at a lower frequency to charge the output capacitor before switching to high-frequency operation. This preliminary action prevents supply voltage drops that would occur if high-frequency operation were initiated immediately, while still achieving fast voltage generation in the subsequent loading mode.
3Productivity
If the charge pump uses higher frequency operation, then output current is increased, but input current requirements increase
Solution Approach 1:
The charge pump dynamically adjusts its operating frequency to match the actual current demands of the system. During warm-up mode when full current is not needed, it operates at a lower frequency, reducing input current consumption. During loading mode when high output current is required, it switches to high frequency to meet the productivity demands. This dynamic adjustment resolves the contradiction between maintaining high productivity and reducing energy consumption.
Data Source
AI summary
A charge pump circuit includes a voltage controlled oscillator. The voltage controlled oscillator operates at a lower frequency during a warm-up mode, and operates at a higher frequency during a loading mode. The lower frequency operation during the warm-up mode reduces power supply current requirements.