Isolated Phase Control Power Regulation Circuit
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Solution Overview
Problem
Existing phase control circuits for regulating power in mains-operated AC devices pose safety hazards due to direct connection to mains voltage, making them unsuitable for hazardous locations and difficult to obtain regulatory approval.
Innovation Solution
A phase-controlled power regulation circuit that is electrically isolated from line voltage using a transformer to reduce voltage, combined with a photo-triac and optocoupler, allowing a potentiometer to be remotely located and operated at low voltage, eliminating shock hazards and enabling regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a potentiometer is connected directly to mains voltage to set power output, then the circuit can provide phase control functionality, but it creates electric shock hazards and regulatory approval difficulties
Solution Approach 1:
The patent introduces an optocoupler as an intermediary device between the low-voltage control circuit and the high-voltage power circuit. The optocoupler transfers control signals optically, providing galvanic isolation that eliminates electric shock hazards while maintaining phase control functionality. The potentiometer operates at safe low voltage, and its control signals are transmitted through the optocoupler to trigger the triac for power regulation.
2Ease of operation
If the potentiometer is connected to mains voltage, then power regulation can be achieved, but the circuit becomes unsuitable for hazardous or wet locations
Solution Approach 1:
The optocoupler serves as an isolating intermediary that separates the control circuit from the power circuit, allowing the potentiometer to operate at safe low voltages. This isolation makes the control circuit suitable for hazardous or wet locations where direct mains voltage connections would be dangerous.
3Object-affected harmful factors
If the potentiometer is operated at low voltage with electrical isolation, then safety and regulatory approval are improved, but the circuit complexity increases due to additional isolation components
Solution Approach 1:
The optocoupler provides efficient electrical isolation with a simple structure consisting of an LED and photodetector. This intermediary component achieves safety requirements without requiring complex isolation transformers or multiple protective layers, thus limiting the increase in circuit complexity.
Solution Approach 2:
The patent replaces traditional electrical connection methods with optical signal transmission. Instead of using electrical wires to connect the potentiometer to the triac control, the system uses optical signals through the optocoupler, simplifying the isolation architecture while maintaining safety.
4Object-affected harmful factors
If the potentiometer is remotely located using class 2 wiring, then safety is improved and new applications are enabled, but the device complexity and installation requirements increase
Solution Approach 1:
The optocoupler enables the potentiometer to be remotely located by providing galvanic isolation that allows control signals to be transmitted through class 2 low-voltage wiring. This intermediary isolation component makes remote installation safe and practical for applications like bathroom lighting control.
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 solution provides a safe and compliant power regulation system that simplifies regulatory approval and allows for remote operation, enabling use in hazardous locations and complex regulation systems.
Implementation Method 1
A transformer regulates the line voltage down to a reduced reference voltage that is used by the power regulation circuit
Implementation Method 2
The transformer also produces, a steady DC voltage to power the control circuit via a diode and a capacitor
Implementation Method 3
The transformer also produces, a steady DC voltage to power the control circuit via a diode and a capacitor
Implementation Method 4
A photo-triac is activated when the LED illuminates and the gate of the photo-triac is opened
Implementation Method 5
A photo-triac is activated when the LED illuminates and the gate of the photo-triac is opened to provide power to the load
Data Source
AI summary
A phase controlled power regulation circuit is isolated from a line voltage and therefore overcomes some of the safety issues associated with currently available potentiometers. A phase controlled power regulation circuit employs a potentiometer that is electrically isolated from mains power. A transformer regulates the line voltage down to a reduced reference voltage that is used by the power regulation circuit. Any single point failure of a component within the power regulation circuit will not create unsafe condition. This greatly simplifies regulatory approval and opens new applications. Since the potentiometer is operated at low voltage, it may be remotely located from the circuits that handle the power with two conductors of class 2 wiring. Also, the potentiometer need not be of a panel mounted rotary or sliding type. It may be a potentiometer integrated circuit controllable from a microprocessor that enables complex regulation and/or sequencing control.