Variable Frequency Voltage Output Circuit Noise Reduction
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Solution Overview
Problem
Motor drive circuits generate noise due to the need for oscillation signals in voltage generating circuits, which can interfere with other electronic devices, especially when using motors or other loads in electric products.
Innovation Solution
A voltage output circuit that includes an oscillator circuit to change oscillation frequency and a voltage generating circuit to convert a first voltage into a second voltage, using a charge pump circuit with transistors, capacitors, and diodes, and a transistor drive circuit to control transistors in a motor drive circuit, reducing noise interference by altering the switching speed of the oscillation signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a voltage generating circuit such as a charge pump circuit is used to generate a voltage higher than the power supply voltage, then the transistor on the upper arm side can be turned on, but noise is generated due to the oscillation signal required for the voltage generating circuit
Solution Approach 1:
The patent applies the dynamics principle by making the oscillation frequency variable rather than fixed. The control unit dynamically adjusts the oscillation frequency of the charge pump circuit based on detected noise levels and operational requirements. This allows the system to maintain the necessary voltage boosting function while minimizing noise interference by shifting the operating frequency away from sensitive ranges, thereby resolving the contradiction between achieving high voltage and reducing noise generation.
2Object-generated harmful factors
If the oscillation frequency is changed to reduce noise impact, then noise diffusion is achieved, but the voltage generation efficiency may be affected
Solution Approach 1:
The patent implements parameter changes by systematically varying the oscillation frequency parameter of the charge pump circuit. The control unit monitors voltage generation performance and noise levels, then adjusts the oscillation frequency to optimal values that balance both requirements. This dynamic parameter adjustment ensures that voltage generation efficiency is maintained while noise peaks are diffused and minimized, resolving the contradiction between noise reduction and efficiency maintenance.
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 effectively reduces noise peak and its impact on surrounding electronic devices by diffusing the frequency of the noise generated, making it suitable for use in various electric products, including vehicle-mounted devices and home appliances.
Implementation Method 1
a voltage generating circuit configured to convert a first voltage into a second voltage higher than the first voltage, and output the second voltage, based on the oscillation signal
Data Source
AI summary
A voltage output circuit includes: an oscillator circuit configured to output an oscillation signal while changing an oscillation frequency thereof; and a voltage generating circuit configured to convert a first voltage into a second voltage higher than the first voltage, and output the second voltage, based on the oscillation signal.