Charging Device Standby Power Reduction via PWM Control
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Solution Overview
Problem
Existing charging devices for battery packs have high internal consumption of control circuits in standby mode, leading to inefficiencies in power usage.
Innovation Solution
A pulse width modulation module controlled by a second voltage regulator, which can switch on and off to reduce energy supply to secondary windings, and an optocoupler connection for effective control, allowing the control unit to operate with a reduced supply voltage, minimizing power loss in standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control circuit operates in standby mode with continuous energy supply to secondary windings, then the control unit remains fully functional, but power loss increases
Solution Approach 1:
The patent implements periodic action by switching the power switch on and off in pulse width modulation cycles. During standby mode, the power switch remains off for extended periods, discontinuing energy supply to secondary windings while maintaining control unit functionality through periodic pulsing when needed.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the duty cycle of the power switch through the PWM module. The second voltage regulator modifies the control parameters of the power switch to reduce energy supply during standby mode while maintaining sufficient voltage for control unit operation.
2Power
If the power switch is continuously on, then full energy supply is available to secondary windings, but internal consumption of the control circuit increases
Solution Approach 1:
The patent implements dynamics by making the power switch state variable rather than fixed. The PWM module and second voltage regulator dynamically adjust the power switch between on and off states based on operational requirements, optimizing the balance between energy supply and control circuit consumption.
Solution Approach 2:
The patent uses feedback through the second voltage limiting control circuit and voltage regulator that monitor the auxiliary voltage and control the power switch accordingly. This feedback mechanism ensures adequate energy supply to secondary windings while minimizing control circuit consumption by switching off when full power is not needed.
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 solution reduces power loss and internal consumption of the charging device during standby mode by efficiently controlling the energy supply, ensuring the control unit remains functional with minimal power usage.
Implementation Method 1
a switched-mode power supply transformer (150), which generates an electrical output voltage (UOUT) and an auxiliary voltage (UH) from an electrical input voltage (UIN)
Implementation Method 2
At least one of the first and second voltage limiting control loops is connected to the pulse width modulation module via an optocoupler
Data Source
AI summary
In a charging device (100) for charging a battery pack (190), comprising a control circuit (120) for a switching power unit transformer (150) associated with the loading device (100), said transformer having at least one primary winding (152) switchable by a power switch (158), and at least one first secondary winding (154) for generating an electrical output voltage (UOUT) for charging the battery pack (190), wherein the output voltage (UOUT) has a first amplitude which is predefinable by a control unit (110) and adjustable by a first voltage limiting control loop (160), the transformer (150) has at least one second secondary winding (156) for generating at least one electrical auxiliary voltage (UH) having a second amplitude which is predefinable by the control unit (110) and adjustable by a second voltage limiting control loop (180) so as to at least reduce power supply associated with the operation of the control circuit (120) from the primary winding (152) to the secondary windings (154, 156) in standby mode of the control circuit (120).