Linear Voltage Regulator Using Serial Bitstream DAC Isolation
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Solution Overview
Problem
Existing linear voltage regulators face challenges in efficiently regulating voltage due to the complexity and interdependence of their converter and digital to analog converter circuits, which limits design flexibility and increases power consumption.
Innovation Solution
The implementation of a converter circuit that produces a serial bitstream with a pulse density indicative of the voltage difference between the regulated voltage and a reference voltage, which is then processed by a digital to analog converter circuit with an averager circuit to control the power transistor's voltage, allowing for separate design and optimization of each circuit within different voltage domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If converter circuit and digital to analog converter circuit are integrated with interdependent design, then voltage regulation function is achieved, but design flexibility is limited and power consumption increases
Solution Approach 1:
The voltage regulator is divided into two independent circuits: a converter circuit operating in a first voltage domain and a digital to analog converter circuit operating in a second voltage domain. These circuits are coupled through a serial bitstream interface, allowing each circuit to be designed and optimized independently while maintaining the overall voltage regulation function.
2Use of energy by moving object
If converter circuit and digital to analog converter circuit are integrated with interdependent design, then voltage regulation function is achieved, but power consumption increases
Solution Approach 1:
The voltage regulator is divided into two independent circuits: a converter circuit operating in a first voltage domain and a digital to analog converter circuit operating in a second voltage domain. These circuits are coupled through a serial bitstream interface, allowing each circuit to be designed and optimized independently while maintaining the overall voltage regulation function.
3Power
If higher voltage devices are used in digital to analog converter circuit, then voltage control capability is improved, but circuit area and power consumption increase
Solution Approach 1:
The voltage regulator is divided into two independent circuits: a converter circuit operating in a first voltage domain and a digital to analog converter circuit operating in a second voltage domain. These circuits are coupled through a serial bitstream interface, allowing each circuit to be designed and optimized independently while maintaining the overall voltage regulation function.
Solution Approach 2:
A serial bitstream interface acts as an intermediary between the converter circuit and the digital to analog converter circuit. This interface allows voltage regulation information to be transmitted from the high voltage domain to the low voltage domain, enabling the digital to analog converter circuit to use lower voltage devices while maintaining overall system performance.
Data Source
AI summary
A linear voltage regulator includes a converter circuit that provides a serial bitstream having a pulse density that is indicative of a difference between a regulated voltage of the linear voltage regulator and a reference voltage. The linear voltage regulator also includes a digital to analog converter circuit that includes an input to receive the serial bitstream. The digital to analog converter circuit includes an averager circuit that produces an output signal to control a voltage of a control terminal of a power transistor of the linear voltage regulator for regulating the regulated voltage based on the pulse density of the serial bitstream.