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Inverter Fluorescent Lamp
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Overview
In contrast to the conventional glow starter florescent lamps, inverter fluorescent lamps employ inverter technology which boost the switching frequency to more than 10,000 times per second, thus making a glow starter unnecessary. They also eliminate flicker and unpleasant buzzing while consuming 20% to 30% less power, thus making them more eco-friendly than the conventional lamp type. In addition, the inverter circuit can be used to adjust the light level. This is suitable for high-grade lighting fixtures and provides additional value. Recently, DALI (Digital Addressable Lighting Interface) systems employing multiple lamps have been developed.
Renesas product lineup includes the R8C Family of 8/16-bit MCUs with on-chip PWM (Pulse Width Modulation) generation and output functions. In particular, the 78K0 Series and the R8C/2x Series of MCUs integrate dimmer inverter control, PFC (Power Factor Correction) on/off control, and DALI communication functions, and are ideal for inverter fluorescent lamp applications such as ceiling-recessed fixtures that are compact and lightweight while consuming little power.
System Block Diagram
Recommended Products
| Block | Semiconductor Device | Recommended Product Name | Features, etc. |
|---|---|---|---|
| Control MCU | MCU | 78K0/Ix2 | 16-bit MCU for use in inverter control |
| R8C/2x Series | 20 MHz maximum operating frequnency, 2.2 to 5.5 V operating votlage, 20 to 80-pin packages | ||
| MCU peripheral | Reset IC | RNA519xx Series | Variable detection voltage |
| Inverter | MOS FET | RJK60xx Series, RJK50xx Series | VDSS = 500 to 600 V |
| Prevention of inrush current | Thyristor | CR3PM-12C, CR5AS-12 | |
| Power supply | MOS FET | RJK60xx Series, RJK50xx Series | VDSS = 500 to 600 V |
| PFC IC | R2A20113A * | Suitable for low power devices, secondary coil unnecessary | |
| General use surge absorption, circuit protection, etc. | Zener diode | HZMxNB Series | 3-terminal (1 device included) face-mount outline High ESD tolerance optimal for use in surge absorption |
| NNCDxxDA Series | High ESD tolerance optimal for use in surge absorption | ||
| RDxxS Series | 2-terminal face-mount outline | ||
| RKZxxKG, KJ, KK | 2-terminal face-mount outline High ESD tolerance optimal for use in surge absorption | ||
| Switching diode | HSU119/HSC119 | 2-terminal face-mount outline | |
| HSM2838C, HSM123 | 3-terminal (2 devices included) face-mount outline | ||
| Schottky barrier diode | HRB0502A | 3-terminal face-mount outline (low VF) | |
| HRC0103C, RKD703KL | 2-terminal face-mount outline (low VF and low leak current) | ||
| HRV103A, RKR104BKH | 2-terminal face-mount small outline (Io = 1 A) | ||
| High voltage MOS (IGBT Gate) driver | Photocoupler (IGBT drive) for high voltage MOS | PS9306 (6p-SDIP) PS9506 (8p-DIP) | High isolation voltage (5 kV r.m.s.), 0.6 A output High CMR (CMR = 25 kV) |
* = Under development
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