PWM Generator Standby Power Control via Intermittent Signal
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Solution Overview
Problem
Conventional electronic apparatuses with standby AC/DC converter circuits experience power loss and increased standby power consumption due to continuous operation in standby mode, leading to voltage dips and system instability when trying to minimize power usage.
Innovation Solution
A power controlling method and apparatus that utilize a PWM generator to intermittently turn on/off the PWM signal based on standby voltage levels, with the PWM signal being turned on if the voltage is equal to or lower than a first reference voltage and turned off if higher than a second reference voltage, and a controller monitors the voltage to manage this process, ensuring stable power supply to only necessary components during standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standby AC/DC converter circuit operates continuously in standby mode, then the standby power supply is stable, but the standby power consumption increases due to continuous power loss
Solution Approach 1:
The patent applies periodic action by controlling the PWM signal to operate in intermittent bursts rather than continuously. The PWM converter circuit is activated in periodic cycles during standby mode, with the gate output controlled to switch between active and inactive states. This periodic operation reduces energy loss while maintaining adequate standby power supply through capacitor discharge during inactive periods.
2Loss of energy
If the burst cycle is lowered to decrease standby power, then the standby power consumption decreases, but voltage collapse occurs causing system instability
Solution Approach 1:
The patent implements feedback control by monitoring the output voltage from the PWM converter circuit and adjusting the PWM signal generation accordingly. The feedback terminal receives voltage information from the output stage, and this feedback signal modulates the PWM gate output to maintain stable voltage levels. This closed-loop control prevents voltage collapse while operating in low-power burst mode.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the PWM signal characteristics (duty cycle, frequency, burst duration) based on load conditions and voltage requirements. The controller modifies these parameters to optimize the balance between power consumption and voltage stability, allowing the system to adapt to varying standby power demands without causing voltage collapse.
3Loss of energy
If the PWM signal is turned off intermittently to reduce power loss, then the standby power consumption decreases, but power is not supplied to all components when output current varies suddenly
Solution Approach 1:
The patent applies preliminary action by maintaining charged capacitors on the secondary side of the PWM converter before the PWM signal is turned off. These capacitors are pre-charged during active PWM cycles to store sufficient energy that can supply power to components during the intermittent off periods. This ensures that even when the PWM signal is inactive, essential components continue to receive power from the stored energy.
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 minimizes standby power consumption to zero watts by cutting off power to non-essential components during PWM signal off sections, preventing voltage dips and maintaining stable standby power supply, thus adhering to energy-saving regulations.
Implementation Method 1
a converter configured to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the PWM generator
Data Source
AI summary
An electronic apparatus includes a system portion configured to operate with a received voltage, and a power supply including a pulse width modulation (PWM) generator to generate a PWM signal, a converter to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the PWM generator, and an output portion to supply voltage at the secondary side as standby voltage to the system portion, the PWM generator receives feedback on the standby voltage at the secondary side of the converter, the PWM signal is turned on/off in accordance with levels of the standby voltage at the secondary side, and voltage being supplied to components, except, when the PWM signal is turned off, voltage at the secondary side is only supplied to a component that monitors the feedback of the standby voltage.