Electronic Reverse Buck Converter Current Regulation
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Solution Overview
Problem
Existing electronic reverse buck converters face challenges in accurately regulating current to LED lighting modules due to limitations in current sensing and control, leading to potential inaccuracies in brightness adjustment and energy transfer.
Innovation Solution
An electronic reverse buck converter design featuring a shunt resistor and control circuit with an error amplifier, voltage conversion circuit, and driver circuit to generate error signals for precise control of the electronic switch, utilizing a PI or PID regulator for improved accuracy and a comparator with hysteresis for binary signal handling, ensuring the current through the output terminals matches the requested current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple current sensing method is used in existing electronic reverse buck converters, then the device complexity is reduced, but the manufacturing precision and reliability of current regulation deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the actual current through the shunt resistor and compares it with the requested current. The error amplifier generates an error signal based on this comparison, which is then used to adjust the electronic switch duty cycle, creating a closed-loop control system that improves current regulation accuracy
Solution Approach 2:
The patent replaces traditional mechanical or simple resistive current sensing methods with an electronic feedback-based control system. The shunt resistor combined with error amplifier and PI/PID regulator creates an electronic measurement and control mechanism that provides more accurate current sensing and regulation compared to simpler methods
2Manufacturing precision
If a PI or PID regulator with voltage conversion circuit is implemented, then the current regulation accuracy is improved, but the device complexity increases
Solution Approach 1:
The control circuit is designed to perform multiple functions: the shunt resistor serves both as a current sensing element and a reference for the error amplifier; the error amplifier simultaneously compares voltages and generates control signals; the PI/PID regulator integrates proportional and integral (and derivative) control functions in a single block. This multi-functionality reduces the need for separate dedicated components
Solution Approach 2:
The voltage conversion circuit acts as an intermediary between the error amplifier output and the electronic switch control input. It converts the error signal voltage to the appropriate voltage level and waveform needed to drive the electronic switch, enabling precise control while isolating different parts of the control circuit
3Measurement precision
If precise current sensing with shunt resistor and error amplifier is used, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines the current sensing function and the error detection function into a single integrated control circuit. The shunt resistor is directly connected to the error amplifier input, merging the sensing element with the comparison mechanism. The error amplifier simultaneously performs voltage comparison and generates the error signal, eliminating the need for separate sensing and control blocks
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 solution enhances the accuracy of current regulation, improving the control-loop efficiency and reducing inaccuracies in brightness adjustment, thereby providing a more precise and stable power supply to LED lighting modules.
Implementation Method 1
a shunt resistor (1128), connected between the second output terminal and the inductor, so that a voltage across the shunt resistor is indicative of the current being provided through the output terminals
Implementation Method 2
an error amplifier, adapted to generate an error signal as a function of the voltage across the shunt resistor and an identified reference signal of a requested current
Implementation Method 3
an inductor, wherein the inductor and both output terminals are connected in series between the cathode and the anode of the diode
Implementation Method 4
an electronic switch, which are connected in series between the input terminals, wherein the cathode of the diode is connected to the first input terminal and the switch is connected between the second input terminal and the anode of the diode
Implementation Method 5
a diode and an electronic switch, which are connected in series between the input terminals, wherein the cathode of the diode is connected to the first input terminal
Implementation Method 6
utilizing a PI or PID regulator for improved accuracy and a comparator with hysteresis for binary signal handling, ensuring the current through the output terminals matches the requested current
Implementation Method 7
a comparator with hysteresis for binary signal handling
Data Source
AI summary
There is disclosed an electronic reverse buck converter (12a). The converter comprises two input terminals (110) for receiving a first power supply signal (Vin) and two output terminals (106) for providing a second power supply signal (io, Vo). A diode (D) and an electronic switch (S) are connected in series between said two input terminals (110), wherein the cathode of diode (D) is connected to the first input terminal and switch (S) is connected between the second input terminal and the anode of the diode, wherein the second input terminal represents a first ground (GNDA). An inductor (L) and both output terminals (106) are connected in series between the cathode and the anode of diode (D), wherein the first output terminal is connected to the cathode of diode (D) and inductor (L) is connected to the anode of diode (D), wherein the second output terminal represents a second ground (GNDB). Specifically, electronic converter (12a) further comprises a control circuit (112a) and a shunt resistor (Rs) connected between the second output terminal and inductor (L), wherein the voltage across shunt resistor (Rs) is indicative of the current provided via both output terminals (106). Control circuit (112a) comprises an error amplifier, a voltage conversion circuit and a driver circuit. The error amplifier generates a first error signal as a function of the voltage across said shunt resistor (Rs) and a reference signal indicative of a requested current, wherein the first error signal is referred to second ground (GNDB). The voltage conversion circuit receives the first error signal and generates a second error signal, wherein the second error signal is referred to first ground (GNDA). The driver circuit drives the switching of electronic switch (S) as a function of the second error signal.