Transient Voltage Compensation Circuit for Power Supply Load Transients
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Solution Overview
Problem
Switching power supplies experience transient output voltage undershoot when switching from light to heavy loads and overshoot when switching from heavy to light loads, leading to instability and potential damage to CPUs, as they cannot supply energy quickly enough to maintain steady voltage.
Innovation Solution
A transient voltage compensation apparatus connected to a power converter, comprising an operational amplifier, DC blocking element, control module, and compensation circuit with an impedance element and switching element, which retrieves AC components of the voltage output to control the on/off state of the compensation circuit, ensuring output voltage stability by providing additional compensation energy when switching loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply uses conventional voltage regulation, then the structure is simple, but the output voltage drops suddenly when switching from light load to heavy load, causing undershoot
Solution Approach 1:
The patent applies preliminary action by detecting the load switching state before the voltage drop occurs and activating the compensation circuit in advance. The control module detects when the load switches from light to heavy, and the compensation circuit is activated to provide additional energy before the output voltage can drop, preventing the undershoot from occurring in the first place
Solution Approach 2:
The patent introduces a compensation circuit as an intermediary element between the power converter and the load. This compensation circuit includes energy storage elements (inductor and capacitor) that act as a buffer, providing additional energy during load transitions and isolating the main power supply from the transient demands of the load
2Speed
If the power supply responds quickly to load changes, then the transient response is improved, but the output voltage may overshoot when switching from heavy load to light load
Solution Approach 1:
The patent implements feedback control by continuously monitoring the output voltage through the operational amplifier and adjusting the compensation circuit's operation accordingly. The feedback mechanism detects voltage deviations and automatically adjusts the compensation energy delivery, ensuring that the output voltage returns to its reference level without overshooting, even during rapid load transitions
Solution Approach 2:
The patent applies dynamics by making the compensation circuit adjustable and adaptive. The control module dynamically adjusts the compensation parameters based on the load state and voltage conditions. The circuit transitions between different operating modes (compensation active/inactive) based on real-time conditions, allowing optimal performance across varying load scenarios
3Reliability
If additional compensation energy is provided during load switching, then the output voltage remains steady, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing the compensation circuit to handle both light-to-heavy and heavy-to-light load transitions with the same basic structure. The circuit serves multiple purposes: providing energy during undershoot conditions, absorbing energy during overshoot conditions, and maintaining voltage stability across various load scenarios, reducing the need for separate compensation mechanisms for each transition type
Solution Approach 2:
The patent applies parameter changes by adjusting the operating parameters of existing components rather than adding substantial new hardware. The control module adjusts the switching timing, duty cycle, and energy transfer parameters of the compensation circuit based on load conditions, achieving effective voltage compensation through parameter optimization rather than through increased hardware complexity
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
The solution effectively maintains steady output voltage during load changes, enhancing the transient response of the power supply and preventing CPU damage by compensating for voltage drops and rises in a short time, thus ensuring stable operation.
Implementation Method 1
an operational amplifier, which is coupled to the output terminal and has a compensation output terminal
Implementation Method 2
a DC blocking element, which has a first terminal coupled to the compensation output terminal and a second terminal
Implementation Method 3
a compensation circuit...with an impedance element and switching element, which retrieves AC components of the voltage output to control the on/off state of the compensation circuit
Implementation Method 4
when an output of the power converter is switched from a light load to a heavy load, an additional compensation energy is supplied to the load, such that the output voltage is kept steady
Data Source
AI summary
A transient voltage compensation apparatus and a power supply using the same are provided. The power supply mainly uses a compensation circuit coupled between an input terminal and an output terminal of a power converter. When a load of the power supply is switched in a very short time, a power coupled to the compensation circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased.