Power Converter Control Circuit for Dynamic Capacitor Switching
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Solution Overview
Problem
Existing power conversion circuits face inefficiencies and noise interference due to delayed switching of capacitors in response to input voltage fluctuations, leading to increased ripple voltages and reduced reliability.
Innovation Solution
A control circuit that dynamically adjusts the operation of a switch in an energy storing circuit based on input voltage conditions, ensuring timely switching of capacitors to maintain optimal capacitance values and minimize ripple voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the switch is turned on to increase overall capacitance value, then the energy storing circuit is suitable for lower input voltage, but the capacitors are exposed to higher voltage stress that may exceed the low-voltage capacitor's rated voltage
Solution Approach 1:
The patent applies dynamics by making the switch state changeable based on input voltage conditions. The control circuit dynamically switches between on and off states according to whether the input voltage is below or above a reference voltage, allowing the energy storing circuit to adapt its capacitance configuration to match operating conditions. This resolves the contradiction by ensuring the low-voltage capacitor is only connected when voltage conditions are safe.
Solution Approach 2:
The patent changes the operational parameters of the capacitor configuration based on input voltage levels. When input voltage is low, the switch closes to increase capacitance; when input voltage is high, the switch opens to reduce voltage stress. This parameter-based control strategy allows the system to optimize capacitance value while avoiding voltage breakdown, resolving the contradiction between capacitance and voltage withstanding capability.
2Strength
If the switch is turned off to use only the high-voltage capacitor, then the capacitors can withstand higher input voltage, but the overall capacitance value decreases reducing effectiveness at low voltage
Solution Approach 1:
The dynamic switching mechanism allows the system to transition between using only the high-voltage capacitor (when input voltage is high) and using both capacitors in parallel (when input voltage is low). The control circuit monitors input voltage and adjusts the switch state accordingly, ensuring optimal voltage withstanding capability while maintaining sufficient capacitance value for the current operating condition.
Solution Approach 2:
The system changes its electrical parameters (capacitance configuration) based on the input voltage parameter. At high voltage conditions, the system uses only the high-voltage capacitor to ensure safety; at low voltage conditions, it engages both capacitors to maximize capacitance. This parameter-based adaptation resolves the contradiction between voltage withstanding and capacitance effectiveness.
3Device complexity
If the switching response is delayed in response to input voltage fluctuations, then the control circuit complexity is reduced, but the ripple voltage increases and reliability decreases
Solution Approach 1:
The patent implements feedback by having the control circuit continuously monitor the input voltage and use this information to control the switch state. The control circuit responds to voltage fluctuations by adjusting the switch accordingly, creating a closed-loop system that maintains optimal capacitor configuration. This feedback mechanism ensures timely switching response that reduces ripple voltage and improves reliability without excessive complexity.
Solution Approach 2:
The control circuit performs self-service by autonomously monitoring input voltage conditions and making switching decisions without external intervention. The system uses its own output (voltage monitoring capability) to control its own operation (switching), enabling timely response to voltage fluctuations while maintaining simple architecture. This self-regulating approach improves reliability through timely switching while keeping the control circuit relatively simple.
Data Source
AI summary
A control circuit of a power conversion circuit includes an energy storing circuit coupled between an AC/DC rectifier circuit and a DC/DC conversion circuit. When a first condition “the absolute peak value of the input voltage of the AC/DC rectifying circuit is smaller than a reference voltage” is satisfied, discharge current is provided for lowering the voltage on the first output end of the AC/DC rectifying circuit. When the first condition and a second condition “the discharge current is smaller than reference current” are both satisfied, a switch of the energy storing circuit is turned on. When the first condition and the second are not both satisfied, the switch of the energy storing circuit is turned off.