Flyback Power Converter Standby Voltage Regulation
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Solution Overview
Problem
Conventional flyback power converter circuits consume significant power in standby mode due to the constant operation of internal output voltage at the same level as operating voltage, leading to inefficient energy usage.
Innovation Solution
The flyback power converter circuit regulates the internal output voltage to a lower standby voltage during standby mode and adjusts the resistance of the adjustment resistor to minimize power consumption, with the blocking switch being controlled to be OFF in standby mode and ON in operation mode, utilizing a transformer, primary side switch, and controller circuits to manage the voltage and feedback signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the internal output voltage is maintained at operating voltage level during standby mode, then the circuit can quickly transition to operation mode, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic voltage regulation by switching between two voltage levels (standby voltage and operating voltage) based on the operational state. The controller dynamically adjusts the internal output voltage to a lower standby voltage when the converter is in standby mode, and switches to full operating voltage when operation is required, thereby reducing standby power consumption while maintaining quick transition capability
Solution Approach 2:
The patent changes the voltage parameter of the internal output voltage based on operational mode. By regulating the voltage to a lower level during standby and switching to the required operating level when needed, the system achieves both low standby power consumption and fast transition to operation mode
2Reliability
If the blocking switch is kept ON during standby mode, then the output voltage is maintained, but power consumption increases
Solution Approach 1:
The blocking switch is dynamically controlled to be OFF during standby mode and switched ON when operation mode is activated. This dynamic switching maintains output voltage stability when needed while eliminating unnecessary power consumption during standby periods
3Measurement precision
If the photocoupler bias current is maintained at high level during standby mode, then feedback accuracy is improved, but power consumption increases
Solution Approach 1:
The bias current of the photocoupler is adjusted based on operational mode. During standby mode, the bias current is reduced to minimize power consumption, while during operation mode, the bias current is increased to ensure accurate feedback signal transmission and measurement
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 approach significantly reduces power consumption in standby mode by maintaining a lower standby voltage and adjusting resistance levels, ensuring sufficient power during operation while minimizing idle energy usage.
Implementation Method 1
a primary side switch, which is configured to operably control a primary side winding of the transformer, so as to convert the input voltage to the internal output voltage at a secondary side of the transformer
Implementation Method 2
an isolated type feedback device, which is configured to operably couple a secondary side feedback signal generated from the secondary side controller circuit to generate a primary side feedback signal in an isolated manner
Data Source
AI summary
A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.