Power Supply Detection Circuit with Shared AC and Temperature Pin
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Solution Overview
Problem
Current detection circuits for power supply systems require separate pins for detecting AC input power and temperature, leading to increased size and hindering miniaturization efforts.
Innovation Solution
A detection circuit that uses a single pin to sample both AC input power and temperature by employing a thermal circuit, reference circuit, voltage detection circuit, and determination circuit, allowing for simultaneous waveform, over-voltage, and over-temperature detection through a shared connection pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate pins are used for detecting AC input power and temperature, then detection accuracy is improved, but circuit size increases
Solution Approach 1:
The patent combines the AC input power detection function and temperature detection function into a single shared pin (connection pin). The voltage detection circuit and thermal circuit both connect to this common pin, allowing multiplexed detection of voltage state and temperature without requiring separate pins, thus reducing circuit size while maintaining detection accuracy
Solution Approach 2:
The connection pin is designed to serve multiple functions: it is used by the voltage detection circuit to detect AC input power state and by the thermal circuit to detect temperature. This multi-functional design eliminates the need for dedicated separate pins for each detection function, achieving circuit miniaturization
2Area of stationary object
If a single pin is used for both AC input power and temperature detection, then circuit size is reduced, but detection reliability may deteriorate
Solution Approach 1:
The voltage detection circuit operates in periodic sampling mode, alternating between sampling the AC input power voltage and allowing the thermal circuit to detect temperature. The control circuit manages this time-division multiplexing, ensuring that each detection function receives adequate attention and that peak voltage values are captured accurately for both voltage and temperature measurements
Solution Approach 2:
The control circuit monitors the detection status and dynamically adjusts the operation of the voltage detection circuit and thermal circuit. When the voltage detection circuit samples, it controls the reference circuit to stop providing temperature reference signals, and vice versa, ensuring that each detection function operates under optimal conditions and maintaining overall detection reliability
Data Source
AI summary
A detection circuit for a power supply circuit is provided. The detection circuit includes a reference circuit, a voltage detection circuit, and a determination circuit. The reference circuit is coupled to a thermal circuit of the power supply circuit through a connection pin. The voltage detection circuit stops the reference circuit from providing a temperature reference signal, and samples a single-phase AC input power through the connection pin. When a peak value information of the single-phase AC input power is sampled, the voltage detection circuit stores the peak value information and enables the reference circuit to provide the temperature reference signal. The determination circuit provides at least one of a waveform detection signal and an over-voltage detection signal in response to the peak value information, and provides an over-temperature detection signal according to at least one of an output signal of the thermal circuit and the peak value information.