Control Circuit Automatic Power-On Switch Unit
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Solution Overview
Problem
In control circuits, manual control of power supply continuity is inconvenient for users and leads to electricity leakage and energy waste, especially in vehicular telematics boxes that rely on multiple power sources, where automatic power-on and power-off functions are hindered by complex software logic and continuous electrical connections.
Innovation Solution
A control circuit and method that automatically enable the switch unit when the power source supplies power, allowing the load device to control the power supply path, using binary signals to manage the switch unit's state and prevent electricity leakage, with a simple circuit design that reduces costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the switch unit is controlled by the load, then automatic power supply can be implemented, but electrical continuity between the load and switch unit must be maintained resulting in electricity leakage and energy waste
Solution Approach 1:
The trigger unit detects power source changes and outputs a first binary signal before the load device is fully powered, preliminarily controlling the switch unit to establish continuity. This preliminary action enables automatic power supply while allowing the load device to later take over control and terminate continuity, preventing energy waste during normal operation
Solution Approach 2:
The control unit acts as an intermediary between the trigger unit and the switch unit. It receives the first binary signal from the trigger unit and the second binary signal from the load device, then processes these signals to control the switch unit. This intermediary structure enables automatic power supply while preventing electricity leakage by ensuring the load device can control continuity without direct electrical connection
2Ease of operation
If manual control of the switch unit is used, then user control is maintained, but operation convenience is reduced and automatic power-on cannot be implemented
Solution Approach 1:
The load device controls the switch unit through the control unit based on its own operating state (powered or not powered). This self-service mechanism enables the load device to automatically control power supply continuity without user intervention, achieving both operation convenience and automatic power-on functionality
Solution Approach 2:
The load device outputs a second binary signal to the control unit based on whether it is powered or not powered. This feedback mechanism enables automatic control of the switch unit - when the load device detects it is not powered, it signals the control unit to close the switch unit, achieving automatic power-on without user intervention
Data Source
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AI summary
Embodiments of this application provide a control circuit and a circuit control method. The control circuit provided in the embodiments of this application includes a switch unit, a trigger unit, and a control unit, where the trigger unit is connected to the control unit, and the control unit is connected to the switch unit. The trigger unit is configured to: after obtaining an abrupt change of an electric signal output by a power source, control the switch unit to be closed by using the control unit, to establish continuity in a path between the power source and a load device, so that the power source supplies power to the load device, and the load device continuously outputs a level signal to the control unit after being energized, to control, by using the control unit, the switch unit to stay in a closed state. In this way, the switch unit can be automatically enabled when the power source supplies power, so that the power source automatically supplies power to the load device. In addition, rights of control over the switch unit are transferred from the trigger unit to the load device, so that the load device can control the path that supplies power to the load device.