Power Supply Charging Current Detection for AC Frequency Calculation
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Solution Overview
Problem
Existing power supply devices for machines like air conditioners require separate circuits for power transmission and detection, leading to increased parts and mounting area on control boards due to independent implementation of half-wave rectification for both functions.
Innovation Solution
A power supply device integrating a power generation unit, a detection unit, and a calculation unit, where the detection unit utilizes the rectifying part of the power generation unit, reducing the need for additional components and space by sharing the rectifying part for both functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate circuits are provided for power transmission and detection functions, then each circuit can be independently implemented, but the number of parts and mounting area on control board increase
Solution Approach 1:
The patent combines the power transmission circuit and detection circuit into a single integrated circuit. The rectifying part is shared between both functions, where the same rectifying components (diodes, resistors) are used to generate both transmission power and detection signals. This merging eliminates the need for separate independent circuits, reducing the number of parts and mounting area while maintaining independent implementability through functional integration.
Solution Approach 2:
The rectifying part is designed to serve multiple functions simultaneously: it rectifies AC power for the transmission circuit and generates detection signals for the detection circuit. By making the rectifying part universal, the patent reduces component count and mounting area while ensuring that both power transmission and detection functions can be independently implemented through the shared infrastructure.
2Ease of manufacture
If separate circuits are provided for power transmission and detection functions, then each circuit can be independently implemented, but the mounting area on control board increases
Solution Approach 1:
The patent merges the power transmission circuit and detection circuit into a single integrated circuit structure. The rectifying part is shared between both functions, eliminating the need for separate mounting spaces for independent circuits. This integration significantly reduces the mounting area on the control board while preserving the ability to independently implement and maintain each functional aspect.
Solution Approach 2:
The rectifying part is designed as a universal component that serves both power transmission and detection functions. By making the rectifying infrastructure universal, the patent reduces the total mounting area required, as the same physical components support multiple functions rather than requiring separate dedicated spaces for each circuit.
3Reliability
If a detection circuit is provided independently with its own rectifying part, then the detection function is complete, but the cost of control board increases
Solution Approach 1:
The patent merges the detection circuit with the power transmission circuit, sharing the rectifying part between them. This integration reduces device complexity by eliminating redundant components and lowering voltage rating requirements, as the shared rectifying part operates at optimized voltage levels suitable for both functions rather than requiring separate high-voltage components for independent detection circuitry.
Solution Approach 2:
The rectifying part is designed as a universal component that serves both power transmission and detection functions. By making it universal, the patent reduces the overall device complexity and component voltage ratings, as the same infrastructure supports multiple functions at optimized voltage levels rather than requiring separate high-voltage components for each function.
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
This integration reduces the number of parts and mounting area on control boards, lowers component voltage ratings, and decreases costs by utilizing existing components, thereby simplifying the design and reducing costs.
Implementation Method 1
a charging unit that rectifies AC power and is charged by a rectified voltage
Data Source
AI summary
A power supply device is provided with a diode rectifier circuit having an input connected to an AC power source, the output of the diode rectifier circuit producing a rectified voltage; a capacitor connected to the diode rectifier to be charged by the rectified voltage; and a controller configured to receive as input a detection signal representing a charging current flowing into the capacitor, the controller being further configured to calculate a voltage frequency, a cycle, or a power voltage phase of the AC power on the basis of the detection signal. At least one of the following is used to detect the charging current flowing into the capacitor and produce the detection signal: a photocoupler; an amplifier circuit including a shunt resistor and an operational amplifier; and a current transformer.