Switching Regulator Phase-Lead Circuit for Fast Low-Current Response
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Solution Overview
Problem
Conventional switching regulators consume large current due to the inclusion of comparators and counters, which are inefficient in managing sudden fluctuations in load current.
Innovation Solution
A switching regulator design that utilizes a first differential amplifier, a second differential amplifier with a differential pair of transistors, and a pulse width modulation circuit, along with resistors and capacitors to create a phase lead circuit, eliminating the need for comparators and counters, thereby reducing current consumption while maintaining high-speed responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a comparator and/or counter is used to speed up the response of the output voltage with respect to sudden fluctuations of load current, then the responsiveness is improved, but the current consumption increases
Solution Approach 1:
The patent extracts and removes the comparator and counter components from the conventional switching regulator circuit. By eliminating these high current-consuming components, the invention achieves low current consumption while maintaining fast responsiveness through an alternative circuit configuration using differential amplifiers with specific transistor arrangements and time constant circuits.
Solution Approach 2:
The patent changes the operational parameters of the differential amplifiers by introducing time constant circuits (resistors and capacitors) that adjust the response characteristics. This allows the circuit to achieve fast responsiveness without requiring the high current consumption of conventional comparators and counters, effectively changing the dynamic response parameters through passive component selection.
2Speed
If conventional components (comparator and counter) are used, then high-speed responsiveness is achieved, but device complexity and current consumption increase
Solution Approach 1:
The patent merges the functions of error amplification and response speed control into a unified differential amplifier circuit with time constant networks. Instead of using separate comparator and counter components, the invention combines multiple functional elements (differential pairs, resistors, capacitors) into an integrated circuit structure that achieves both fast response and low complexity.
Solution Approach 2:
The patent replaces the mechanical/digital components (comparator and counter) with an analog circuit implementation using differential amplifiers. This substitution eliminates the need for discrete digital logic components, reducing overall device complexity while maintaining the desired responsiveness through continuous analog signal processing.
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 proposed design achieves reduced current consumption and high-speed responsiveness to load current fluctuations without using comparators or counters, enhancing efficiency and performance.
Implementation Method 1
a first differential amplifier outputting an amplified difference voltage obtained by amplifying a difference between a reference voltage and a feedback voltage in proportion to an output voltage
Implementation Method 2
a second differential amplifier including a differential pair of a first transistor and a second transistor, outputting an error voltage based upon the amplified difference voltage supplied to each gate of the first transistor and the second transistor
Implementation Method 3
a pulse wide modulation circuit converting the error voltage into a PWM signal
Implementation Method 4
a capacitor containing a first end connected to the source of the first transistor and the first end of the first resistor
Implementation Method 5
create a phase lead circuit
Data Source
AI summary
A switching regulator includes a first differential amplifier outputting an amplified difference voltage obtained by amplifying a difference between a reference voltage and a feedback voltage in proportion to an output voltage; a second differential amplifier including a differential pair of a first transistor and a second transistor, the second differential amplifier outputting an error voltage based upon the amplified difference voltage supplied to each gate of the first transistor and the second transistor; a pulse wide modulation circuit converting the error voltage into a PWM signal; a first resistor containing a first end connected to the source of the first transistor; a second resistor containing a first end connected to the source of the second transistor; and a capacitor containing a first end connected to the source of the first transistor and the first end of the first resistor.