Constant-Power Supply Circuit for Stable Solar Simulator Bulbs
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Solution Overview
Problem
Solar simulation test facilities using HQI discharge bulbs face instability in power output due to increased resistance and voltage changes, affecting light-emitting parameters and bulb life.
Innovation Solution
A constant-power supply apparatus with a power board and control panel, incorporating voltage and current detection circuits, a multiplier circuit, and a PWM circuit to stabilize power output by controlling the photocoupling unit and switch tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a stable current drive device is used, then the bulb can operate continuously, but the power varies continuously due to voltage changes caused by increasing resistance
Solution Approach 1:
The patent implements a feedback control system where the detection circuit continuously monitors the bulb's resistance changes and voltage variations, sends signals to the control circuit, which then adjusts the drive current accordingly to maintain constant power output. This closed-loop feedback mechanism resolves the contradiction by enabling continuous operation while maintaining power stability despite resistance changes.
Solution Approach 2:
The patent dynamically changes the drive current parameter in response to detected resistance and voltage changes. The control circuit adjusts the current magnitude based on real-time measurements, transforming the static current drive into a dynamic parameter-adjustment system that maintains constant power despite varying bulb resistance over time.
2Duration of action of stationary object
If the operating voltage changes due to resistance increase, then the bulb continues to operate, but the light-emitting parameters and life are affected
Solution Approach 1:
The detection circuit monitors voltage and current parameters in real-time, providing feedback to the control circuit which adjusts the drive parameters to maintain consistent light-emitting characteristics. This feedback mechanism ensures that despite resistance changes affecting operating voltage, the light output parameters remain stable and consistent throughout the bulb's operational life.
Solution Approach 2:
The system performs self-adjustment by automatically detecting its own operating parameters (voltage, current, resistance) and correcting deviations without external intervention. The control circuit self-regulates the drive current to compensate for resistance changes, thereby maintaining consistent light-emitting parameters and extending bulb life through automated parameter optimization.
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
Ensures stable power output, enhancing the reliability and longevity of the bulb by maintaining consistent power levels.
Implementation Method 1
The current detection circuit comprises a Hall sensor arranged on the current conversion circuit
Implementation Method 2
a photocoupling unit and a Chock inductor, wherein an input terminal of the switch tube is connected to the power input circuit, an output terminal of the switch tube is connected to a first terminal of the Chock inductor
Data Source
AI summary
Disclosed are a constant-power supply apparatus and a solar simulation facility. The constant-power supply apparatus comprises: a power board and a control panel, wherein the power board comprises: a power input circuit for providing a power input, a power conversion circuit connected to the power input circuit, a voltage detection circuit, a current detection circuit and a power output circuit respectively connected to the power conversion circuit, and a first connector connected to the power conversion circuit, the voltage detection circuit and the current detection circuit; and the control board comprises: a second connector pluggably connected to the first connector, a voltage processing circuit and a current processing circuit respectively connected to the second connector, a multiplier circuit connected to the voltage processing circuit and the current processing circuit, and a PWM circuit connected to the current processing circuit, the multiplier circuit and the second connector.