Power Supply IC Mode Switching for No-Load Power Reduction
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Solution Overview
Problem
Existing integrated circuits for power supply circuits continue to consume power even when the load is in a no-load state due to the constant operation of load detection circuits, making it difficult to further reduce power consumption.
Innovation Solution
An integrated circuit configured to switch and drive a power transistor, with a first switch that turns on and off in response to an instruction signal, operating in two modes with different power consumption levels. The circuit includes a determination circuit to select the operating mode based on a voltage level, a power supply voltage generation circuit that stops generating a power supply voltage in the low-power mode, and a driver circuit that receives the power supply voltage to switch and drive the power transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load detection circuit operates constantly to detect the load state, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The load detection circuit operates dynamically by switching between active detection mode and standby mode. The mode selection circuit changes the operation state of the detection circuit based on whether a no-load detection signal is active, making the system adaptable to different operational requirements and reducing unnecessary power consumption during no-load conditions
Solution Approach 2:
The patent extracts the no-load detection function as a separate control mechanism that can independently influence the operation state of the load detection circuit. By detecting no-load conditions through a dedicated signal path, the system can selectively disable the main detection circuit, separating the continuous monitoring function from the active detection function
2Reliability
If the integrated circuit operates in high-power mode to ensure full functionality, then the operational reliability is improved, but the power consumption increases
Solution Approach 1:
The integrated circuit implements dynamic power mode switching between normal mode and low-power mode based on load conditions. The mode selection circuit responds to no-load detection signals to transition the circuit to appropriate power states, ensuring full functionality during loaded operation while reducing power consumption during no-load conditions
Solution Approach 2:
The patent changes operational parameters by adjusting the power consumption level of the integrated circuit based on detected load conditions. When a no-load detection signal is present, the circuit transitions to a low-power operational state with modified parameter values, while maintaining the ability to quickly return to full-power operation when load conditions change
Data Source
AI summary
An integrated circuit for a power supply including a power transistor, the integrated circuit being configured to switch and drive the power transistor. The integrated circuit includes: a first terminal to which a first switch is coupled; a first determination circuit configured to determine, based on a voltage level at the first terminal, whether to operate the integrated circuit in a first mode or a second mode, a power consumption in the second mode being greater than a power consumption in the first mode; a first power supply voltage generation circuit configured to stop generating a first power supply voltage when the integrated circuit operates in the first mode, and generate the first power supply voltage when the integrated circuit operates in the second mode; and a driver circuit configured to receive the first power supply voltage, to switch and drive the power transistor.