Power Supply Control Circuit Instantaneous Power Loss Discharge
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Solution Overview
Problem
Conventional power supply control circuits face difficulties in reliably discharging power to the internal supply when the external power supply is instantaneously cut off, leading to unstable operation and potential device malfunctions.
Innovation Solution
A power supply control circuit comprising a voltage detection unit, internal power supply generation units, and a control unit that uses multiple control signals to manage discharging to the internal power supply, ensuring reliable discharging even during instantaneous external power loss by utilizing a second control signal based on the internal power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power supply control circuits are designed to discharge to the internal power supply when the external power supply is cut off, then the operation stability is improved, but when the external power supply is instantaneously cut off, the discharging operation cannot be initiated because the circuit operation stops immediately, leading to unreliable discharging
Solution Approach 1:
The patent introduces a delay circuit that delays the reset signal generation when the external power supply voltage drops. This preliminary action allows the discharging circuit to continue operating for a predetermined period after the external power is cut off, ensuring that discharging is completed before the circuit stops. The delay circuit creates a time window where the discharging operation can finish even though the external power is already gone.
2Stability of the object's composition
If the power-on reset circuit is designed to release the reset state after ensuring power supply operation, then the stability during normal operation is improved, but when the external power is instantaneously cut off, the reset state cannot be properly released, causing operational abnormalities
Solution Approach 1:
The delay circuit performs a preliminary action by delaying the assertion of the reset release signal. When the external power supply voltage drops below a threshold, the delay circuit waits for a predetermined time before releasing the reset state. This ensures that the discharging operation has enough time to complete before the circuit transitions to the operational state, preventing operational abnormalities.
3Reliability
If the circuit is designed to operate continuously without instantaneous shutdown, then the discharging reliability is improved, but the device complexity increases due to the need for delay circuits and additional control logic
Solution Approach 1:
The patent employs a delay circuit that uses simple RC (resistor-capacitor) timing elements to create a predetermined delay period. This preliminary action mechanism is relatively simple in structure compared to complex control logic, as it relies on passive components and basic timing circuits rather than sophisticated control algorithms or additional active management systems.
Data Source
AI summary
A power supply control circuit that is able to reliably discharge to the internal power supply, even when the external power supply is cut off instantaneously. The power supply control circuit includes a voltage detection unit, an internal power supply generation unit, and a control unit. The voltage detection unit detects the voltage of the external power supply. The internal power supply generation unit generates the internal power supply, according to the external power supply. The control unit controls the discharging to the internal power supply according to at least the second control signal among the first control signal and the second control signal, when the detected voltage of the external power supply drops below the predetermined value.