Power Supply Output Discharge Circuit for Enable Interruption
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Solution Overview
Problem
Existing power supply control devices fail to reliably discharge output voltage during enable instantaneous interruptions, leading to potential erroneous operations in electronic systems.
Innovation Solution
Incorporating a configuration with a discharge switch, timer, comparator, and discharge controller in the output discharge unit, which continues to discharge the output voltage until it falls below a threshold or after a predetermined delay time, even when an enable instruction is given, ensuring reliable voltage discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power supply control device stops discharging the output voltage when an enable instruction is given, then the response speed is improved, but the reliability deteriorates because the output voltage may not be fully discharged during enable instantaneous interruption
Solution Approach 1:
The discharge operation is initiated in advance when a disable instruction is detected, and the discharge switch is maintained in the on-state for a predetermined period after the enable instruction. This preliminary and extended discharge action ensures that the output voltage is reliably discharged even during enable instantaneous interruption, resolving the contradiction between fast response and reliability.
2Reliability
If the output discharge unit continues discharging the output voltage for a predetermined period after enable instruction, then the reliability is improved, but the loss of time increases due to extended discharge duration
Solution Approach 1:
The discharge switch is turned on for a predetermined period after the enable instruction, which may be longer than strictly necessary in normal operation. This excessive discharge action ensures reliability during enable instantaneous interruption, accepting some time loss as a necessary trade-off for system reliability.
3Adaptability or versatility
If the power supply unit is repeatedly enabled and disabled, then the adaptability is improved, but the harmful factors increase due to insufficient voltage discharge between transitions
Solution Approach 1:
The discharge switch remains in the on-state continuously from the disable instruction until a predetermined period after the enable instruction, ensuring continuous voltage discharge throughout the transition period. This continuous discharge action prevents erroneous operations during repeated enable/disable cycles, resolving the contradiction between adaptability and harmful factors.
Data Source
AI summary
Disclosed are a power supply control device and an electronic apparatus. The power supply control device includes a power supply unit configured to generate an output voltage from an input voltage, and an output discharge unit configured to start to discharge the output voltage when an instruction to disable the power supply unit is given, and continue discharging the output voltage until the output voltage falls below a predetermined threshold voltage or until a predetermined delay time passes while the output voltage does not fall below the threshold voltage even when an instruction to enable the power supply unit is given. The electronic apparatus includes a power supply device including the power supply control device as a main constituent, and at least one load configured to operate while supplied with an output voltage from the power supply device.