Power Supply Control Device Voltage Regulation
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Solution Overview
Problem
Existing power supply control devices suffer from efficiency losses due to the LDO operating as a low drop regulator, which sets the output voltage Vdc significantly higher than the output voltage Vo, resulting in unnecessary voltage drops and reduced efficiency, especially when the load current varies.
Innovation Solution
A power supply control device is designed with a boost type power supply controller and a step down power supply controller, where the output voltage is initially controlled by a second control loop during startup and then switched to a first control loop after a predetermined period, optimizing voltage regulation and reducing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the LDO operates as a low drop regulator with Vdc significantly higher than Vo, then the maximum load current can be supplied, but the voltage drop increases causing efficiency loss
Solution Approach 1:
The patent dynamically switches between two control loops based on operating conditions. During startup, the second control loop (LDO) is active to gradually increase output voltage. After a predetermined period, the first control loop (DC-DC converter) takes over for efficient voltage regulation, adapting the control strategy to different operational phases to minimize energy loss while maintaining load supply capability
Solution Approach 2:
The system changes the control parameter from LDO-based voltage regulation to DC-DC converter-based regulation after a predetermined time period. This parameter change allows the system to transition from a mode that ensures safe startup to a mode that optimizes efficiency by reducing the voltage difference between Vdc and Vo through precise control of the DC-DC converter
2Reliability
If the output voltage Vo is gradually increased during startup, then inrush current is prevented, but the startup time increases
Solution Approach 1:
The second control loop (LDO) performs preliminary action during startup by gradually increasing the output voltage before the main DC-DC converter takes over. This preliminary voltage ramping prevents inrush current to the load while preparing the system for efficient operation, after which the first control loop assumes responsibility for voltage regulation
3Power
If the Vdc is set sufficiently large to supply maximum load current, then the load current requirement is met, but the voltage drop and power loss increase
Solution Approach 1:
The system dynamically adjusts the voltage regulation strategy by switching between two control loops. During normal operation after startup, the DC-DC converter maintains Vdc closer to Vo, reducing the voltage difference and thus the power loss, while still being capable of supplying maximum load current when needed through coordinated control of both converters
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 enhances the efficiency of the power supply control device by minimizing voltage drops and adapting to varying load conditions, thereby reducing power consumption and improving overall performance.
Implementation Method 1
a boost type power supply controller boosting an input voltage
Implementation Method 2
a step down power supply controller reducing an output of the boost type power supply controller to output an output voltage
Data Source
AI summary
A power supply control device includes a boost type power supply controller boosting an input voltage, a step down power supply controller reducing an output of the boost type power supply controller to output an output voltage, a first control loop including the boost type power supply controller, and a second control loop including the step down power supply controller, wherein the output voltage is controlled by the second control loop during a predetermined period beginning after the power supply control device enters a power-on state, and wherein the output voltage is controlled by the first control loop after the predetermined period passes.