DC Power Conversion Circuit Self-Auxiliary Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DC power conversion circuits for LEDs suffer from low efficiency due to linear regulators, leading to significant power dissipation and potential damage from overheating, and lack self-protection against short or open load circuits.
Innovation Solution
A DC power conversion circuit with a driving circuit and auxiliary circuit, where the auxiliary circuit includes a capacitor and diode parallel to the inductor, providing a steady auxiliary voltage to the control signal generator, allowing for self-protection against short or open load conditions by adjusting the switch-on frequency based on the auxiliary voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear regulator is used to regulate voltage for the control signal generator, then the control signal generator receives stable working voltage, but power dissipation increases and efficiency decreases
Solution Approach 1:
The patent extracts the auxiliary power function from the main power supply path by introducing a separate auxiliary circuit with capacitor and diode. This auxiliary circuit provides dedicated power for the control signal generator, isolating it from the high-power switching path and eliminating the need for a linear regulator to drop voltage from the main supply.
Solution Approach 2:
The patent introduces an auxiliary capacitor and diode as intermediary components between the main power supply and the control signal generator. The capacitor stores energy during switch on-time and releases it during off-time, while the diode prevents reverse current flow, together providing stable auxiliary voltage without direct linear regulation.
2Speed
If the switch transistor switches at high frequency to improve response time, then the response time decreases, but power loss in the switch increases
Solution Approach 1:
The patent employs periodic switching action where the switch transistor operates in pulsed mode rather than continuous conduction. The switch turns on only during the charging phase and off during the discharging phase, creating periodic current flow that reduces average power loss while maintaining high-frequency response capability through optimized pulse width modulation.
3Illumination intensity
If the DC voltage source provides high voltage to achieve proper LED luminance, then the luminance increases, but power dissipation in the voltage regulation increases
Solution Approach 1:
The patent transitions from static voltage regulation to dynamic voltage conversion using a switching converter topology. The output voltage is dynamically adjusted by controlling the duty cycle of the switch transistor, allowing the circuit to maintain high LED luminance while minimizing power dissipation through efficient on-off switching rather than continuous linear voltage dropping.
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 enhances efficiency by reducing power dissipation and prevents damage to the load circuit by maintaining stable operations and adjusting switch frequency in response to load circuit conditions, ensuring reliable operation and energy conservation.
Implementation Method 1
The auxiliary capacitor has a first end coupled to the second end of the first resistor, and a second end coupled to the second end of the second resistor
Implementation Method 2
The auxiliary diode has a first end coupled to the second end of the auxiliary capacitor, and a second end coupled to the second end of the inductor
Implementation Method 3
when the switch transistor 102 turns off, the inductor 108 generates a reversed-polarity voltage. In other words, when the switch transistor 102 turns off, the inductor 108 conducts the loop L1 so that the inductor 108 transfers electricity to the capacitor 110 and the load circuit 112
Data Source
AI summary
A DC power conversion circuit having self-auxiliary power and self-protection against a short or open load circuit includes a DC voltage source, a driving circuit, and an auxiliary circuit. The DC voltage source is used for providing a DC power. The driving circuit includes a switch, a first resistor, a control signal generator, a second resistor, a diode and an inductor. The switch is used for conducting or cutting off an electrical connection according to an incoming control signal. The control signal generator senses voltage of the first resistor to generate the control signal. The inductor is coupled between the first resistor and a load circuit. The auxiliary circuit is parallel to the inductor and includes an auxiliary capacitor and an auxiliary diode. The auxiliary capacitor is coupled between the first resistor and the second resistor. The auxiliary diode is coupled between the inductor and the auxiliary capacitor.