Semiconductor Circuit DC-DC Converter Voltage Regulator Power Loss
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Solution Overview
Problem
Voltage regulators experience significant power loss and heat generation due to fluctuations in output voltage, particularly when the input voltage is higher than the desired output voltage, leading to inefficiencies in semiconductor circuits.
Innovation Solution
A semiconductor circuit design that includes a reference voltage generating circuit, a voltage control circuit, and a DC-DC conversion circuit, which maintains a constant difference between the input and output voltages by generating a second reference voltage, thereby reducing power loss and heat generation through controlled voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input voltage is fixed at a high level (e.g., 7V) to ensure sufficient voltage headroom for the voltage regulator, then the voltage regulator can maintain stable output voltage regulation, but power loss and heat generation increase significantly when the output voltage is low (e.g., 1V)
Solution Approach 1:
The patent implements a dynamic input voltage adjustment mechanism where the DC-DC conversion circuit continuously adapts its output voltage based on real-time monitoring of the voltage regulator's output. The control circuit modifies the DC-DC converter's duty cycle dynamically to maintain the minimum required voltage difference (dropout voltage) between input and output, rather than using a fixed high input voltage. This dynamic adaptation reduces the voltage differential and consequently lowers power loss while ensuring the voltage regulator always operates within its regulation range.
2Device complexity
If the DC-DC conversion circuit output is fixed at a constant voltage (e.g., 7V), then the circuit structure is simple, but power loss and heat generation occur due to fluctuations in the voltage regulator output voltage
Solution Approach 1:
The patent employs a feedback control mechanism where the voltage regulator's output voltage is monitored and fed back to the DC-DC conversion circuit's control unit. The control circuit compares the actual output voltage with the target voltage and adjusts the DC-DC converter's operating parameters accordingly. This closed-loop feedback system ensures that the DC-DC converter dynamically adjusts its output to maintain optimal voltage headroom, reducing power loss while adding minimal complexity through the use of standard control circuitry.
3Adaptability or versatility
If the voltage regulator operates with a large voltage difference between input and output, then it can handle wide output voltage ranges, but heat generation becomes severe
Solution Approach 1:
The system dynamically adjusts the DC-DC conversion ratio based on the desired output voltage level. When the voltage regulator needs to output lower voltages, the DC-DC converter reduces its output accordingly, maintaining a smaller and more efficient voltage differential. This dynamic adjustment allows the system to handle a wide range of output voltages while minimizing heat generation at each operating point by optimizing the input voltage to the voltage regulator in real-time.
Data Source
AI summary
A semiconductor circuit includes a reference voltage generating circuit which generates a first reference voltage; a voltage control circuit which receives the first reference voltage from the reference voltage generating circuit to output a second reference voltage; a DC-DC conversion circuit which executes DC-DC conversion on the basis of the second reference voltage which is output from the voltage control circuit, and provides an output thereof to a first node; and a voltage regulator which executes voltage regulating on the basis of the first reference voltage which is output from the reference voltage generating circuit, and a voltage of the first node, and provides an output thereof to a second node.