This block is used to reduce and stabilize the voltage produced by the PFC block. The output voltage of this block is controlled by the control signal. Since the output voltage is higher than the safe touch (according to...Electronics Projects, 600W LED Dimmer Circuit PFC ICE2PCS01 UCC28C43 "power electronic projects, smps circuits, smps projects, smps schematic, " Date 2019/08/04
This block is used to reduce and stabilize the voltage produced by the PFC block. The output voltage of this block is controlled by the control signal. Since the output voltage is higher than the safe touch (according to the CSN standard), it is possible to use the lower switch at the lowering drive. UCC28C43 integrated circuit is used for control
First, a part of the PFC was fitted to make it easier to locate any faults. The peripheral components of this block have been installed and run through a series-connected bulb that serves as a protection against a possible short circuit. The figure (Fig. 3.3) contains the oscillogram with the control voltage and voltage on the transistor Q1 without loading the PFC output. The load on the PFC load was gradually connected to the output of which the power loss 140, 330, 500 and 660 W was generated. contain oscilloscope with PFC voltage waveforms at 660 W and input Voltage 220 V. The waveform of the input current is approximately sinusoidal. The mean voltage of the PFC output is 370 V. The voltage ripple is 16 volts.
This chapter describes the design of the dimmer as a whole. Requirements for it are: adjustable DC output voltage up to Uout_BUCK = 285 V, output power Pout_BUCK = 600 W (at output voltage Uout_BUCK) AC input voltage in the range Uin_min_PFC = 190 to Uin_max_PFC = 260 V Output voltage control via external PWM signal power components on a common heat sink, high dimmer power factor.
The ICE2PCS01 integrated circuit serves as a control circuit as well as a power transistor driver for active power factor correction in CCM. This circuit has 8 outlets. is capable of delivering 600 watts of power to the output voltage of 285 V. This means that up to 150 LEDs of the HCFL-1404C type can be dimmed at once. The results of the measurement show that the realized dimmer has an efficiency of approximately 93% and the output voltage ripple is 70 mV at maximum load. The current flow through the L3 choke is regular even at higher output voltages and no case of subharmonic oscillation has been detected. It follows that the adjustment of the compensation signal of the slope compensation did not interfere with its function. Therefore, the L3 choke could be designed for a maximum current value of approximately 250 mA less. The proposed connection (Fig. 2.6) of this compensation also makes it easier to set the required parameters of the compensation signal compared to the normal wiring, which are listed in the current controller datasheets. The shape of the compensation signal is not affected by the waveform of the sensed current.