LED driving power is a necessary product for LED lighting;the behaviors of pursuing low-cost of some small and medium- sized enterprise producers in China directly affect the quality of LED power. Therefore, it is nec...LED driving power is a necessary product for LED lighting;the behaviors of pursuing low-cost of some small and medium- sized enterprise producers in China directly affect the quality of LED power. Therefore, it is necessary to detect the reliability of the LED driving power. There are 4 main factors for the over-burning of the LED driving power: lightning oscillation frequency, voltage mutation frequency, switch motion frequency and static discharge frequency. For the above problems, this paper raises the LED driving power online detection system, including: surge voltage input module, main control module, pulse width modulation module, power module, thyristor control module, current transformer, amplifier, RMSDC conversion module, A/D conversion module, display module, main control module connecting to surge voltage input module. The main operating principle is that the main control module connects the pulse width modulation module, which connects the thyristor control pole of the thyristor control module, the first anode thereof connects the power module;the primary side of current transformer connects the second anode of the thyristor control module through two wire switches, and the secondary side thereof connects the amplifier, which connects the RMS-DC conversion module;RMS-DC conversion module connects the A/D conversion module, which connects the main control module;the main control module also connects the display module. In addition, the project also provides the detection functions of LED output current, voltage digital display and different loads.展开更多
A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode cir...A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode circuit, which offers high-input and low-output impedance hence it can be directly connected to load without using any buffer circuits. PSPICE is used to verify the circuit performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±2.5 V supply voltage demonstrates high precision rectification and excellent temperature stability. In addition, the application of proposed rectifier to pseudo RMS-to-DC conversion is also introduced.展开更多
文摘LED driving power is a necessary product for LED lighting;the behaviors of pursuing low-cost of some small and medium- sized enterprise producers in China directly affect the quality of LED power. Therefore, it is necessary to detect the reliability of the LED driving power. There are 4 main factors for the over-burning of the LED driving power: lightning oscillation frequency, voltage mutation frequency, switch motion frequency and static discharge frequency. For the above problems, this paper raises the LED driving power online detection system, including: surge voltage input module, main control module, pulse width modulation module, power module, thyristor control module, current transformer, amplifier, RMSDC conversion module, A/D conversion module, display module, main control module connecting to surge voltage input module. The main operating principle is that the main control module connects the pulse width modulation module, which connects the thyristor control pole of the thyristor control module, the first anode thereof connects the power module;the primary side of current transformer connects the second anode of the thyristor control module through two wire switches, and the secondary side thereof connects the amplifier, which connects the RMS-DC conversion module;RMS-DC conversion module connects the A/D conversion module, which connects the main control module;the main control module also connects the display module. In addition, the project also provides the detection functions of LED output current, voltage digital display and different loads.
文摘A new precision full-wave rectifier employing only two differential difference current conveyors, which is very suitable for CMOS technology implementation, is presented. The proposed rectifier is the voltage-mode circuit, which offers high-input and low-output impedance hence it can be directly connected to load without using any buffer circuits. PSPICE is used to verify the circuit performance. Simulated rectifier results based-on a 0.5 μm CMOS technology with ±2.5 V supply voltage demonstrates high precision rectification and excellent temperature stability. In addition, the application of proposed rectifier to pseudo RMS-to-DC conversion is also introduced.
