Power Supply Circuit RC Delay Reduction
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Solution Overview
Problem
Conventional power supply circuits with a standby function experience long transition response times when the second voltage converting circuit transitions from an inactive to an active state due to RC delay caused by parasitic capacitance and resistor wiring, leading to deviations in internal power voltage.
Innovation Solution
A power supply circuit design incorporating a voltage converter, switching elements, a comparator, and a setting voltage source, where the first and second switching elements are controlled based on a control signal to manage the transition between active and inactive states, utilizing a resistor to divide the internal voltage and feedback the divided voltage to the comparator, ensuring rapid recovery to a steady state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the second voltage converting circuit is controlled to be inactive to reduce power consumption, then power consumption is reduced, but the transition response time when switching to active state becomes long
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitors connected to the comparator inputs before the switching transition. The first voltage converting circuit maintains readiness and the capacitors are pre-charged to appropriate voltage levels during the inactive state, so that when the second voltage converting circuit transitions to active, the comparator can immediately compare accurate voltage values without waiting for capacitor charging, thus reducing transition response time while maintaining power savings during standby
Solution Approach 2:
The patent uses feedback by continuously monitoring the internal power voltage through the voltage dividing circuit and feeding this information back to the comparator. The comparator compares the divided internal power voltage with a reference voltage and generates control signals to the voltage converting circuits. This feedback mechanism ensures rapid detection and correction of voltage deviations during state transitions, enabling quick recovery to steady state while maintaining efficient power management
2Power
If the second voltage converting circuit transitions from inactive to active state, then power supply capacity is improved, but the internal power voltage deviates from desirable voltage due to RC delay
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitors at the comparator inputs before the transition occurs. The first voltage converting circuit remains in a ready state and pre-charges the capacitors to the appropriate voltage levels during the inactive period. When the second voltage converting circuit activates, the capacitors are already charged, eliminating the RC delay effect and preventing voltage deviation, thus maintaining voltage precision while providing full power supply capacity
Solution Approach 2:
The patent employs feedback through the voltage dividing circuit that continuously monitors the internal power voltage and feeds it back to the comparator. The comparator compares this feedback voltage with the reference voltage and immediately generates corrective control signals when deviations occur during state transitions. This closed-loop feedback mechanism ensures the internal power voltage quickly returns to the desirable voltage level, maintaining manufacturing precision even during dynamic transitions
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
The solution significantly reduces the transition response time when the power supply circuit transitions from an inactive to an active state, maintaining the internal power voltage within a desirable range without deviation, thereby improving the stability and efficiency of the power supply.
Implementation Method 1
a voltage converter which receives an external voltage from an external voltage source and outputs an internal voltage which is different from the external voltage
Implementation Method 2
a resistor which is provided between the first switching element and the second switching element and divides the internal voltage
Implementation Method 3
a comparator which includes a first input unit, a second input unit, and an output unit and outputs a control signal for controlling the first switching element, the second switching element, and the third switching element
Data Source
AI summary
The disclosure concerns a power supply circuit comprising a voltage converter receiving an external voltage and outputting an internal voltage; a first switch and a second switch connected between an output of the voltage converter and a constant voltage source; a resistor provided between the first switch and the second switch, and dividing the internal voltage; a comparator including a first input unit, a second input, and an output which is connected to the voltage converter; a reference voltage source supplying a reference voltage to the first input; a feedback feeding back a voltage divided by the resistor to the second input from a node between the first switch and the second switch; a setting voltage source, to the second input; a third switch connected between the setting voltage source and the second input; and a control signal generator controlling the first switch, the second switch, and the third switch.