Dual-Regulator Power Supply Circuit for Threshold-Based Sequencing
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Solution Overview
Problem
Existing power supply technologies using resistors and capacitors to control timing sequences are sensitive to environmental changes, leading to inconsistent power supply timing due to temperature variations and other environmental factors.
Innovation Solution
A power supply circuit utilizing two regulators, where the first regulator generates a low output signal that enables the second regulator, allowing for controlled voltage thresholds to manage power-on and power-off stages, ensuring that the timing sequence is not affected by environmental changes, with the voltage rising and falling points of low and high output signals properly sequenced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resistors and capacitors are used to control timing sequence, then power supply timing can be controlled, but the timing sequence becomes sensitive to environmental changes
Solution Approach 1:
The patent changes the control parameter from passive RC timing (sensitive to temperature) to active regulator-controlled timing. The regulators' output voltages are controlled by reference voltages and feedback networks, providing stable timing control that is not affected by environmental changes. The timing sequence is determined by voltage threshold comparisons rather than RC time constants.
2Reliability
If regulators are used to control timing sequence, then environmental stability is improved, but device complexity increases
Solution Approach 1:
The regulators perform dual functions: voltage regulation and timing sequence control. By enabling the regulators to control both the voltage output and the timing of power supply stages, the patent eliminates the need for separate RC timing circuits, thereby reducing overall circuit complexity while maintaining environmental stability.
Solution Approach 2:
The patent introduces enable inputs and feedback networks as intermediaries between the regulators and the power supply stages. These intermediaries allow the regulators to precisely control the timing sequence by enabling or disabling power stages based on voltage threshold comparisons, providing a clean and controlled timing mechanism without complex external circuitry.
Data Source
AI summary
A power supply circuit includes a first regulator and a second regulator. The first regulator is configured to generate a first output signal according to an input signal. A voltage value of the first output signal decreases according to the input signal and a first voltage threshold value at a power-off stage. The second regulator is configured to be enabled according to the first output signal to generate a second output signal according to the input signal. A voltage value of the second output signal decreases according to the input signal and a second voltage threshold value at the power-off stage. The second voltage threshold value is greater than the first voltage threshold value.