Switch Power Supply Control IC Reducing Standby Power
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Solution Overview
Problem
Traditional AC-DC converters, such as linear converters, are inefficient and costly, and even switch power supplies with feedback control consume significant standby power due to high current usage in components like optocouplers and amplifiers.
Innovation Solution
A control IC for switch power supplies that includes a voltage collecting module, error amplifying module, time collecting module, and control module to adjust frequency and duty ratio based on feedback signals, reducing standby power consumption by modulating current sources and pulse width/frequency modulation to maintain constant output voltage and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional feedback control components (optocoupler and amplifier) are used to maintain output voltage accuracy, then output voltage stability is improved, but standby power consumption increases due to high work current requirements
Solution Approach 1:
The patent extracts and eliminates the high-power analog components (optocoupler H1 and amplifier TL431) from the feedback control path. Instead of using these traditional components that require work current >1mA, the invention implements a digital feedback control mechanism within the control IC that achieves the same voltage regulation function with significantly lower power consumption during standby mode
Solution Approach 2:
The patent substitutes the analog feedback control mechanism (using optocoupler and amplifier) with a digital control mechanism. The control IC uses digital signal processing and internal feedback loops to achieve voltage regulation, replacing the mechanical/analog components that consume high standby power with a low-power digital implementation
2Device complexity
If fixed frequency and duty ratio control is used to simplify control circuit design, then device complexity is reduced, but efficiency deteriorates under varying load conditions due to inability to adapt to load changes
Solution Approach 1:
The patent implements dynamic frequency and duty ratio control within the control IC. The controller automatically adjusts the switching frequency and duty ratio based on real-time feedback from the output voltage and load conditions. This dynamic adaptation allows the system to maintain high efficiency across varying load conditions while the control logic remains integrated within the IC, balancing complexity and performance
Solution Approach 2:
The patent employs a closed-loop feedback control mechanism where the control IC continuously monitors the output voltage through feedback terminals and automatically adjusts the switching parameters (frequency and duty ratio) to maintain optimal efficiency. The feedback signal is processed by internal control circuits that modulate the PWM output, ensuring the system adapts to load changes without requiring complex external circuitry
Data Source
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AI summary
A control IC of a switch power supply, connected with a switch of the switch power supply, comprises: a voltage collecting module (112), configured to collect a feedback voltage of an output voltage of the switch power supply; an error amplifying module (113), configured to compare the feedback voltage and a reference voltage and output a error voltage; a time collecting module (114), configured to obtain a degaussing time signal according to the feedback voltage, and a control module (115), configured to collect a peak current feedback signal of the switch, control a frequency and duty ratio of a control signal according to the error voltage (VEA), the degaussing time signal (Tds) and the peak current feedback signal (CS), and control the switch according to the control signal. A switch power supply is also provided.