CN203057664U

CN203057664U - High-performance long-life fluorescent lamp electronic ballast

Info

Publication number: CN203057664U
Application number: CN 201220672863
Authority: CN
Inventors: 张新安
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-10
Filing date: 2012-12-10
Publication date: 2013-07-10
Anticipated expiration: 2022-12-10

Abstract

The utility model discloses a high-performance long-life fluorescent lamp electronic ballast. The electronic ballast is composed of an EMI filtering circuit, a rectification filter circuit, a PFC circuit, an IC high-frequency inversion and protection circuit, and a boosting and ballasting circuit which are sequentially connected. The EMI filtering circuit is a low-pass filtering circuit composed of a capacitor and an inductor. The PFC circuit is a valley-filled passive power factor correction circuit composed of diodes and capacitors. The IC high-frequency inversion and protection circuit is composed of an integrated circuit chip FAN7387V and peripheral components, such as resistors, capacitors and diodes, and has the functions of pre-heating, igniting, operation, filament breaking and over-heat protection which are required by a fluorescent lamp electronic ballast. The IC high-frequency inversion and protection circuit has an operation frequency of 49 KHz, and a maximum frequency of 78 KHz. The boosting and ballasting circuit is a series resonance boosting and inductance ballasting circuit composed of inductors and capacitors. The beneficial effects of the utility model are that, the volume is small, the weight is light, the cost is low, the power factor is high, the protection function is complete, and the service life is long.

Description

A kind of high performance and long service life electronic ballast for fluoresent lamp

Technical field

The utility model relates to fluorescent lamp ballast, is specifically related to a kind of high performance and long service life electronic ballast for fluoresent lamp.

Background technology

The electronic ballast for fluoresent lamp of Chu Shouing nearly all is the auto-excitation type bipolar transistor half-bridge inversion circuit that adopts the magnetic ring transformer feedback in the market, and with respect to traditional Inductive ballast, its advantage is that volume is little, and is in light weight.But have following shortcoming simultaneously: (1) transistor is driven by magnetic ring transformer, oscillatory feedback loop complexity, and the operating frequency instability, reliability is low.(2) do not have filament pre-heating and open circuit protecting function, cause filament open circuit and semi-bridge inversion output transistor to damage easily, the life-span of fluorescent lamp is short.(3) do not have power factor correction circuit, the power factor (PF) of electric ballast generally is no more than 0.6, and the utilance of electric energy is low.

Summary of the invention

For solving the deficiency of existing electronic ballast for fluoresent lamp, the utility model discloses a kind of high performance and long service life electronic ballast for fluoresent lamp.The volume of this ballast is little, in light weight, cost is low, power factor (PF) is high, defencive function is perfect, long service life, can be widely used in the electronic ballast for fluoresent lamp field.

For achieving the above object, the utility model adopts following technical scheme: the utility model is made up of the EMI filter circuit that is linked in sequence successively, current rectifying and wave filtering circuit, pfc circuit, IC high-frequency inversion and protective circuit, the ballasting circuit that boosts.The low-pass filter circuit that the EMI filter circuit is made up of capacitor C 1 and inductance L 1.The valley fill type Passive Power factor correcting circuit that pfc circuit is made up of D5, D6, D7, C3 and C4.IC high-frequency inversion and protective circuit are by integrated circuit (IC) chip FAN7710V and peripheral resistance R 1, R2, and capacitor C 5, C6, C7, C8, C9 and diode D8, D9, D10 form.R2 and C7 are designed to 82K Ω and 680nF respectively, and the running frequency of high-frequency inverter circuit is 49KHz, and highest frequency is 78KHz, and be 1S warm-up time.The series resonance that the ballasting circuit that boosts is made up of inductance L 2 and capacitor C 10 is boosted and the inductance ballast circuit.

Good effect of the present utility model is: volume is little, in light weight, cost is low, power factor (PF) is high, defencive function is perfect, long service life.

Description of drawings

Fig. 1 is block diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1, the utility model is made up of the EMI filter circuit that is linked in sequence successively, current rectifying and wave filtering circuit, pfc circuit, IC high-frequency inversion and protective circuit, the ballasting circuit that boosts.

As shown in Figure 2, C1 and L1 constitute electromagnetic interface filter, are used for suppressing the High-frequency Interference pulse of IC high-frequency inverter circuit generation to the interference of mains supply.

D1, D2, D3, D4 and C2 form current rectifying and wave filtering circuit, and the 220V alternating current is obtained direct voltage about 300V through rectifying and wave-filtering, are the power supply of IC high-frequency inverter circuit.

The valley fill type Passive Power factor correcting circuit that pfc circuit is made up of D5, D6, D7, C3 and C4.Capacitor C 3, C4 serial connection charge, parallel discharge.At alternating current in each half period, the time that AC-input voltage is higher than VD is elongated, the angle of flow of rectifier diode increases, the zero passage Dead Time of supply voltage shortens, its current waveform trends towards continuously, envelope trends towards sine wave, makes the interchange input current chase supply voltage transient change track.This pfc circuit can be provided to power factor more than 0.945, total harmonic distortion THD＜29.65%.

IC high-frequency inversion and protective circuit are by integrated circuit (IC) chip FAN7710V and peripheral resistance R 1, R2, and capacitor C 5, C6, C7, C8, C9 and diode D8, D9, D10 form.Have electronic ballast for fluoresent lamp must preheating, igniting, operation and filament open circuit, overheat protective function.In high-frequency inverter circuit, R1 is the starting resistance of IC1, and C5 is decoupling capacitance, and R2 is that oscillator frequency is set resistance, and C7 is that filament preheating time arranges electric capacity, and D8 and C6 are bootstrapping operation diode and electric capacity, and D9, D10 and C8 form the charge pump additional supply.Whole ballast circuit comprises that FAN7710V only uses 26 components and parts, has realized that number of elements is minimized.The high and low end of integrated oscillator, preheating and half-bridge drives signal dead-time control circuit, zero voltage switch (ZVS) control circuit, overheated (165 °) protection and filament open a way detection and protective circuit and the high and low end high-voltage power of half-bridge MOSFET on the FAN7710V chip.

This ballast has four kinds of mode of operations.During preheating mode, the voltage on the C7 is warm-up time from the time that 0V is increased to 3V, and the utility model is designed to 82K Ω and 680nF respectively with R2 and C7, and the running frequency of high-frequency inverter circuit is 49KHz, and highest frequency is 78KHz, and be 1S warm-up time.During ignition mode, it is the lamp duration of ignition that the voltage on the C7 is increased to the needed time of 5V from 3V, is about 0.113S.At ignition phase, frequency of oscillation descends gradually up to resonance, and the voltage increase on the lamp causes the igniting of lamp.The maximum point ignition voltage of ballast only occurs in the resonance point place of the output circuit of being made up of L2 and C10.Just can control this maximum point ignition voltage by the value of setting L2 and C10.After lamp was lighted, IC1 entered operational mode, and the voltage on the C7 is greater than 5V, and operating frequency is fixed on 49KHz.When the voltage on the C7 during greater than 6 V, active ZVS circuit start, IC1 satisfies ZVS by the control Dead Time, so that the switching loss of MOSFET minimizes in the half-bridge.If the voltage on the C7 is pulled down to below the 2.1V, IC1 will close.In " shut " mode", no longer include signal output, only consume the electric current of 250 μ A.When the IC1 junction temperature surpassed 165 ℃, IC1 also can enter " shut " mode".

The process of filament open-circuit-protection is: if the filament open circuit, resonant groove path will lose efficacy, and the half-bridge output current is to 8 chargings of charge pump capacitor C and discharge; capacity load occurring drives; no longer satisfy the ZVS condition, the IC1 power dissipation is increased sharply, might make its damage.FAN7710V can detect the filament open fault automatically, increases Dead Time by the voltage that reduces C7, to satisfy the ZVS condition.In case the voltage of C7 is down to below the 2.1V, IC1 enters " shut " mode", will avoid half-bridge to damage like this.If the IC1 junction temperature of chip surpasses 165 ℃, IC also can enter closed condition and quit work, and realizes overtemperature protection.

The ballasting circuit that boosts is made up of L2 and C10, and at ignition phase, when series resonance took place for L2 and C10, the high-voltage pulse of the last generation of C10 was applied on the fluorescent tube, can make the fluorescent tube puncture and lights.After lamp was activated and lights, L2 played the ballast effect.

Claims

1. high performance and long service life electronic ballast for fluoresent lamp, it is characterized in that: it is made up of the EMI filter circuit that is linked in sequence successively, current rectifying and wave filtering circuit, pfc circuit, IC high-frequency inversion and protective circuit, the ballasting circuit that boosts.

2. a kind of high performance and long service life electronic ballast for fluoresent lamp according to claim 1 is characterized in that: the low-pass filter circuit that the EMI filter circuit is made up of capacitor C 1 and inductance L 1.

3. a kind of high performance and long service life electronic ballast for fluoresent lamp according to claim 1 is characterized in that: the valley fill type Passive Power factor correcting circuit that pfc circuit is made up of D5, D6, D7, C3 and C4.

4. a kind of high performance and long service life electronic ballast for fluoresent lamp according to claim 1; it is characterized in that: IC high-frequency inversion and protective circuit are by integrated circuit (IC) chip FAN7710V and peripheral resistance R 1, R2, and capacitor C 5, C6, C7, C8, C9 and diode D8, D9, D10 form.

5. a kind of high performance and long service life electronic ballast for fluoresent lamp according to claim 1, it is characterized in that: R2 and C7 are designed to 82K Ω and 680nF respectively, and the running frequency of high-frequency inverter circuit is 49KHz, and highest frequency is 78KHz, and be 1S warm-up time.

6. a kind of high performance and long service life electronic ballast for fluoresent lamp according to claim 1 is characterized in that: the series resonance that the ballasting circuit that boosts is made up of inductance L 2 and capacitor C 10 is boosted and the inductance ballast circuit.