Voltage Peak Detection Circuit for Switching Power Supplies
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Solution Overview
Problem
Conventional voltage peak detection circuits in switching power supplies require large resistors and capacitors, leading to high product costs and large circuit area, making them unsuitable for integration and inefficient in responding to transient input voltage signals.
Innovation Solution
A voltage peak detection circuit comprising a voltage coupling circuit, a voltage conversion circuit, and a holding circuit that inductively couples the input inductor voltage, converts it proportionally, and holds the peak voltage signal, eliminating the need for resistor networks and using smaller capacitors to reduce size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage peak detection circuits use large resistors and capacitors, then detection accuracy is maintained, but product cost and circuit area increase significantly
Solution Approach 1:
The patent changes the detection parameters by using voltage division ratio and capacitive coupling instead of direct large capacitor charging. The detection circuit uses a voltage division network (R1, R2) to scale down the peak voltage, and a small capacitor C1 coupled through resistor R3 to generate the peak signal, thereby achieving accurate detection with minimal component size.
2Measurement precision
If conventional voltage peak detection circuits use large resistors and capacitors, then detection accuracy is maintained, but product cost increases
Solution Approach 1:
The patent changes the detection parameters by using voltage division ratio and capacitive coupling instead of direct large capacitor charging. The detection circuit uses a voltage division network (R1, R2) to scale down the peak voltage, and a small capacitor C1 coupled through resistor R3 to generate the peak signal, thereby achieving accurate detection with minimal component size.
Solution Approach 2:
The patent replaces expensive large-value passive components with cheaper small-value components. By using voltage division and capacitive coupling, the circuit achieves the same detection function using inexpensive small resistors and capacitors, significantly reducing bill of materials cost.
3Reliability
If conventional voltage peak detection circuits are designed for accuracy, then peak information is reliable, but circuit integration becomes difficult
Solution Approach 1:
The patent changes the detection parameters by using voltage division ratio and capacitive coupling instead of direct large capacitor charging. The detection circuit uses a voltage division network (R1, R2) to scale down the peak voltage, and a small capacitor C1 coupled through resistor R3 to generate the peak signal, thereby achieving accurate detection with minimal component size.
Solution Approach 2:
The patent segments the detection function into distinct stages: voltage division (R1, R2), signal coupling (C1, R3), and peak holding (C2). This segmentation allows each function to be implemented with simple, small components that can be easily integrated, while maintaining overall detection accuracy.
4Reliability
If conventional voltage peak detection circuits use large components, then transient voltage peak detection is possible, but response efficiency to transient signals decreases
Solution Approach 1:
The patent introduces dynamic response capability by using a small capacitor C1 coupled through resistor R3 that can rapidly charge and discharge in response to transient voltage peaks. This dynamic capacitive coupling allows the circuit to quickly track and respond to transient signals without the sluggish response characteristic of large component circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces product costs and size by eliminating the need for large resistors and capacitors, improving efficiency in detecting transient voltage peaks and enhancing circuit integration, while maintaining accurate peak information transmission to control circuits.
Implementation Method 1
a voltage coupling circuit configured to inductively couple an input inductor voltage of a switching power supply
Data Source
AI summary
In one embodiment, a voltage peak detection circuit can include: (i) a voltage coupling circuit configured to inductively couple an input inductor voltage of a switching power supply, and to generate a first voltage that represents a DC input voltage of the switching power supply; (ii) a voltage conversion circuit configured to receive the first voltage, and to generate a second voltage that is proportional to the first voltage; and (iii) a holding circuit configured to hold a peak of the second voltage to generate a peak voltage signal that represents peak information of the DC input voltage.