Power Circuit Discharge Control for Current Reduction
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Solution Overview
Problem
Existing power circuits continue to consume current even after the capacitor has completely discharged, leading to increased consumption current in the discharge completion state.
Innovation Solution
A power circuit design that includes an input terminal, a control element, an output terminal, a discharge circuit, a drive circuit, a detection circuit, and a discharge control circuit, where the discharge control circuit reduces the drive current to a level that allows continuous operation of the discharge circuit once the output voltage reaches a preset setup voltage, ensuring complete discharge of the capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge circuit operates continuously to ensure complete discharge of the capacitor, then the discharge reliability is improved, but the consumption current increases
Solution Approach 1:
The patent applies dynamics by making the drive current adjustable rather than fixed. The discharge control circuit dynamically changes the drive current value based on discharge progress, transitioning from a higher initial current to a lower sustained current, thereby resolving the contradiction between maintaining reliable discharge operation and reducing consumption current.
Solution Approach 2:
The patent changes the parameter of drive current from a constant value to a variable value. By controlling the drive current to have different magnitudes at different discharge stages (larger initially, then smaller), the system achieves both complete discharge reliability and reduced consumption current, directly addressing the technical contradiction.
2Loss of energy
If the drive current is reduced to minimize consumption current, then energy efficiency is improved, but the discharge speed and completeness may be compromised
Solution Approach 1:
The patent applies preliminary action by providing a larger drive current at the beginning of the discharge process when the capacitor holds significant charge. This initial high current ensures rapid discharge and completeness, after which the current is reduced to a smaller value that maintains discharge functionality while minimizing energy consumption, thus resolving the contradiction between energy efficiency and discharge speed.
Solution Approach 2:
The patent implements periodic action by dividing the discharge process into distinct phases with different current levels. The drive current transitions from a first larger value to a second smaller value, creating a time-varying discharge profile that optimizes both discharge effectiveness and energy efficiency, addressing the contradiction between discharge speed and energy loss.
Data Source
AI summary
A power circuit includes an input terminal to which an input voltage is applied; a control element which generates an output voltage obtained by regulating the input voltage; an output terminal from which the output voltage is output; a discharge circuit which discharges by extracting an electric charge from the control element on a side of the output terminal; a drive circuit which generates a drive current for causing the discharge circuit to operate using power of the control element on the side of the input terminal; a detection circuit which detects the output voltage; and a discharge control circuit which decreases a current value of the drive current to a current value enabling the discharge circuit to continuously operate in a case where the detection circuit detects that the output voltage reaches a setup voltage by an operation of the discharge circuit.