Electromagnetic Heating Control Circuit Voltage Detection
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Solution Overview
Problem
Existing electromagnetic heating control circuits face high costs and power consumption due to complex voltage sampling circuit structures, which are necessary for effective power control and voltage protection in electromagnetic heating devices.
Innovation Solution
The introduction of a synchronous voltage detection circuit that directly connects the voltage detection terminal of the control chip to the output terminal of the rectifying and filtering circuit, reducing the need for complex voltage sampling at the input terminal and enabling power control and under-voltage/over-voltage protection, while using a switch transistor and drive circuit to manage the heating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage sampling circuit is provided at the input terminal of the rectifying and filtering circuit to detect the voltage of the input terminal, then the power control and voltage protection functions are achieved, but the structure of the voltage sampling circuit becomes complex, causing high cost and high power consumption
Solution Approach 1:
Instead of detecting the input terminal voltage as conventionally done, the patent inverts the detection point to the output terminal of the rectifying and filtering circuit. The control chip detects the output voltage and uses it to control the switch transistor, which in turn controls the input power. This inversion simplifies the voltage sampling circuit structure while maintaining effective power control and voltage protection functions.
Solution Approach 2:
The output voltage detection circuit serves multiple functions: it detects the rectified voltage level, provides feedback for power control, and enables under-voltage/over-voltage protection. By making the voltage detection system multi-functional, the patent eliminates the need for separate complex sampling circuits at the input terminal, thereby reducing overall circuit complexity and power consumption while maintaining detection reliability.
2Measurement precision
If a complex voltage sampling circuit is used at the input terminal, then accurate voltage detection is achieved, but the cost of circuit design increases
Solution Approach 1:
The patent inverts the voltage detection approach by measuring the output voltage of the rectifying and filtering circuit instead of the input voltage. This single detection point provides sufficient information for both power control and protection functions, eliminating the need for complex multi-point sampling circuits and reducing design costs while maintaining detection precision.
Solution Approach 2:
The patent merges the voltage detection function with the power control feedback loop. The output voltage detection serves both as a measurement for control purposes and as a protection mechanism. This consolidation eliminates redundant circuits and reduces design complexity and cost while maintaining accurate voltage detection capability.
3Reliability
If a complex voltage sampling circuit is provided, then comprehensive voltage control is achieved, but the power consumption of the circuit increases
Solution Approach 1:
By inverting the detection point to the output terminal, the patent reduces the number of active components and sampling circuits required. The single output voltage detection point provides sufficient feedback for power control and protection, reducing the overall power consumption of the voltage sampling system while maintaining control reliability.
Solution Approach 2:
The patent extracts and eliminates redundant voltage sampling circuits from the input terminal by realizing that output voltage detection suffices for both power control and protection functions. This removal of unnecessary circuitry directly reduces the power consumption of the voltage detection system while preserving comprehensive voltage control capability.
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 solution reduces the cost and power consumption of circuit design by simplifying voltage detection and control, improving the stability and efficiency of electromagnetic heating devices.
Implementation Method 1
the synchronous voltage detection circuit is used to detect a voltage at the output terminal of the rectifying and filtering circuit
Implementation Method 2
a switch transistor Q, in which the switch transistor Q includes a first terminal, a second terminal, and a control terminal configured to control a connection state between the first terminal and the second terminal
Implementation Method 3
a drive circuit 30, in which the control chip 10 controls, according to the voltage detected by the voltage detection terminal, a work state of the switch transistor Q
Data Source
AI summary
Disclosed is an electromagnetic heating control circuit, comprising a control chip, a rectifier filter circuit, a resonant capacitor, a switching transistor, a drive circuit, and a synchronous voltage detection circuit. The switching transistor comprises a first end, a second end, and a control end. The first end is connected to a positive output end of the rectifier filter circuit by using the resonant capacitor. The second end is connected to a negative output end of the rectifier filter circuit by using a current limiting resistor. The control chip comprises a positive phase voltage input end, a negative phase voltage input end, a voltage detection end, and a signal input end. The positive phase voltage input end and the negative phase voltage input end detect voltages at two ends of the resonant capacitor by using the synchronous voltage detection circuit. The signal output end is connected to the control end by using the drive circuit. The voltage detection end is connected to the positive output end of the rectifier filter circuit by using the synchronous voltage detection circuit. The control chip controls a working state of the switching transistor according to a voltage detected by the voltage detection end. Further disclosed is an electromagnetic heating device.