Voltage Reference Control Circuit for Fast Capacitor Charging
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Solution Overview
Problem
Voltage reference generation circuits with large external capacitors delay circuit starting times, which is detrimental for large-scale product testing requiring high precision and low power consumption.
Innovation Solution
A control circuit comprising an operational amplifier and a comparison control circuit that establishes input and output reference voltages and toggles to shut down the operational amplifier when they are consistent, using a comparator with a falling hysteresis to manage the charging of an external capacitor efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microfarad-level large capacitor is externally connected to the output end of the voltage reference generation circuit, then the precision and power consumption requirements are met, but the circuit starting time is delayed
Solution Approach 1:
The control circuit performs preliminary charging of the external capacitor before the voltage reference generation circuit is fully activated. By pre-charging the capacitor through a dedicated control circuit, the capacitor is already partially charged when the main circuit starts, significantly reducing the starting time while maintaining the required precision and power consumption characteristics.
2Reliability
If a large capacitor is connected to ensure high precision and low power consumption, then the voltage reference quality is improved, but the circuit starting speed is reduced
Solution Approach 1:
The control circuit performs preliminary charging of the external capacitor before the voltage reference generation circuit is fully activated. By pre-charging the capacitor through a dedicated control circuit, the capacitor is already partially charged when the main circuit starts, significantly reducing the starting time while maintaining the required precision and power consumption characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick circuit starting while meeting precision and low power consumption requirements by managing capacitor charging to establish reference voltages rapidly and avoid unnecessary power usage.
Implementation Method 1
an operational amplifier circuit and a comparison control circuit, wherein the operational amplifier circuit is arranged to establish an input reference voltage and an output reference voltage by means of an operational amplifier and an external capacitor
Implementation Method 2
the comparison control circuit is arranged to, when the input reference voltage and the output reference voltage are consistent, execute a toggle operation and output an enable signal to the operational amplifier so as to shut down the operational amplifier
Implementation Method 3
the comparator may be a comparator with a falling hysteresis
Data Source
AI summary
A circuit starting method, a control circuit and a voltage reference circuit are provided. The control circuit includes an operational amplifier circuit and a comparison control circuit, wherein the operational amplifier circuit is arranged to establish an input reference voltage (VREF_INT) and an output reference voltage (VREF_OUT) by means of an operational amplifier (EA) and an external capacitor (C); and the comparison control circuit is arranged to, when the input reference voltage (VREF_INT) and the output reference voltage (VREF_OUT) are consistent, execute a toggle operation and output an enable signal (VREF_OK) to the operational amplifier (EA) so as to shut down the operational amplifier (EA).