Constant-Voltage Circuit Bipolar FET Segmentation
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Solution Overview
Problem
Existing constant-voltage circuits face challenges in achieving both stable voltage generation and low power consumption, as reference voltage generation circuits using bipolar transistors consume more power while those using field effect transistors struggle with stable activation.
Innovation Solution
A constant-voltage circuit design that incorporates both a bipolar transistor-based and a field effect transistor-based reference voltage generation unit, where the bipolar transistor is used for initial activation and then switched off, allowing the field effect transistor to generate the constant voltage with low power consumption, while a control unit adjusts the output voltage to correct for process variations without methods like laser trimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference voltage generation circuit using a bipolar transistor is used, then stable activation with constant voltage is achieved, but power consumption increases
Solution Approach 1:
The reference voltage generation circuit is divided into two separate units: a first reference voltage generation unit using a bipolar transistor for stable activation, and a second reference voltage generation unit using a field effect transistor for low power consumption. These units operate at different stages to resolve the contradiction between stability and power consumption.
Solution Approach 2:
The first reference voltage generation unit using the bipolar transistor operates during an initial activation period to provide stable voltage activation. After successful activation, the circuit switches to the second reference voltage generation unit using the field effect transistor, which consumes less power during normal operation.
2Use of energy by moving object
If a reference voltage generation circuit using a field effect transistor is used, then power consumption is reduced, but stable activation becomes difficult
Solution Approach 1:
The bipolar transistor-based first reference voltage generation unit is activated first during an initial period to ensure stable circuit activation. Once activation is confirmed, the circuit transitions to using the field effect transistor-based second reference voltage generation unit for normal operation, ensuring both stable activation and low power consumption.
Solution Approach 2:
The first reference voltage generation unit acts as an intermediary that facilitates stable activation of the circuit before switching to the more power-efficient second unit. This intermediary approach allows the field effect transistor unit to operate reliably without directly handling the initial activation challenges.
3Manufacturing precision
If laser trimming or fuse trimming is used to correct process variation, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The control unit measures the actual output voltage of the second reference voltage generation unit and compares it with a target value. Based on this feedback, the control unit generates a correction signal that adjusts the output voltage to compensate for process variations, eliminating the need for expensive laser trimming or fuse trimming processes.
Solution Approach 2:
The circuit performs self-correction of process variations through the control unit that automatically adjusts the output voltage based on measured values. This self-service approach to correcting manufacturing variations reduces dependency on expensive external trimming processes and simplifies the manufacturing workflow.
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 configuration enables a constant-voltage circuit that achieves stable activation and low power consumption, reducing manufacturing costs by minimizing the influence of process variations and power consumption.
Implementation Method 1
a first reference voltage generation unit which generates a reference voltage using a bandgap voltage of a bipolar transistor
Data Source
AI summary
A constant-voltage circuit includes a first reference voltage generation unit which generates a reference voltage using a bandgap voltage of a bipolar transistor, a second reference voltage generation unit which generates a reference voltage using a field effect transistor, a constant voltage generation unit which generates a constant voltage with reference to either an output voltage of the first reference voltage generation unit or an output voltage of the second reference voltage generation unit, and a control unit which controls the first reference voltage generation unit, the second reference voltage generation unit, and the constant voltage generation unit. During an initial activation period, the first reference voltage generation unit and the second reference voltage generation unit are operated, and during a subsequent operation period, the first reference voltage generation unit is stopped.