CN201114946Y - Dual vertical tube electronic ballast - Google Patents

Abstract

The utility model relates to a double straight-tube electronic ballast, which comprises an EMI electromagnetic interference circuit, a rectifier circuit, a power factor compensation circuit, a self excited oscillation circuit, an inverter or a booster circuit and a protection circuit. 220V alternating current input eliminates EMI electromagnetic interference and RFI high frequency interference by the EMI electromagnetic interference circuit firstly, direct current is output after rectification, then the power factor compensation circuit is used for correcting the power factor, and the inverter or booster circuit is used for outputting high-frequency voltage to drive two parallel connected fluorescent tubes under the control of the self excited oscillation circuit. The utility model provides an electronic ballast which can drive two solid mercury tricolor fluorescent lamps, and has the advantages of saving energy, environmental protection, long service life and being convenient for replacement.

Description

Two straight pipe type electric ballasts

Technical field

The utility model relates to a kind of electric ballast.

Background technology

What at present, the fluorescent light of large scale business, enterprise, office, family used is traditional inductance type ballast and plain edition electric ballast.Inductance type ballast and plain edition electric ballast used by fluorescent lamp market because of its price is relatively cheap, but they exist a lot of defectives and drawback always.Defective such as big as volume weight, that oneself power consumption is big, power factor (PF) is low, noise is arranged, can make fluorescent tube produce stroboscopic, uses the pipe end blackout for a long time, and starter is fragile; Light fixture for former double pipe structure must use two Inductive ballasts or electric ballast, and this not only wastes the rectifier equipment, and also the power consumption because of ballast increases the waste electric power energy.

The light of releasing requires to have characteristics such as energy-conserving and environment-protective in the market; its light efficiency of traditional fluorescent lamp is influenced by halogen powder luminescent material color rendering and light efficiency is not high; and adopt the rare-earth trichromatic fluorescent powder luminescent material at present, and the coating diaphragm, light efficiency obviously improves.Improve approximately 40% as the light efficiency of 28 watts of T5 fluorescent tubes than T12 fluorescent lamp, improve 18% than T8 fluorescent lamp.This material has also solved temperature in load when caliber attenuates, the lamp and mercury vapor pressure increases the problem that causes; Simultaneously, caliber attenuates and has also significantly reduced the use of materials such as fluorescent material, mercury, glass-tube.Therefore, solid mercury trichromatic fluorescent light tube will progressively substitute the product of former T8, T12 fluorescent tube.The appearance of novel lamp tube and light fixture needs the electric ballast of adaptation with it.

Therefore, market demand is a kind of is the matching used electric ballast of two-tube light fixture of applying solid mercury trichromatic fluorescent light tube.

The utility model content

Technical problem to be solved in the utility model provides a kind of electric ballast that can drive two solid mercury trichromatic fluorescent light tubes.

The technical scheme that the utility model adopted is: two straight pipe type electric ballasts are made up of EMI filter circuit, rectification circuit, power factor compensation circuit, self-maintained circuit, inversion/booster circuit, protective circuit; 220V exchanges input and removes EMI electromagnetic interference and RFI High-frequency Interference through the EMI filter circuit earlier; be direct current output through rectification again; pass through power factor compensation circuit corrected power factor then; under the control of self-maintained circuit, drive the fluorescent tube of two parallel connections through inversion/booster circuit output high voltage.

Described EMI filter circuit, form two ∏ type filter circuits by capacitor C A1, CA2, CY1, CY2, inductance T1, wherein two of inductance T1 windings are symmetrical on same magnetic core, and its both sides inductance value is identical, constitutes two groups of symmetrical ∏ type electromagnetic interface filters with capacitor C A1, CA2.

Described power factor compensation circuit adopts Active Power Factor Correction special chip S6500P, and the input AC electricity is a direct current through rectifier bridge D1 rectification, as the input of APFC active power factor compensating circuit; HFS in the capacitor C 1 filtering inductive current; Resistance R 1, R2 and R3 constitute resistance pressure-dividing network, determine the waveform and the phase place of input voltage, and capacitor C 3 constitutes the RC filter with resistance R 3, removes the high-frequency interferencing signal of No. 3 pins; Inductance T2 secondary winding on the one hand is delivered to No. 5 pins of chip, the power supply during on the other hand as the chip operate as normal by resistance R 4 with the inductive current zero cross signal; The chip drives signal is linked the gate pole of metal-oxide-semiconductor by resistance R 5, and resistance R 7 parallel connections detect resistance as inductive current, and this resistance one is terminated at systematically, and the other end is connected on the source electrode of metal-oxide-semiconductor, signal feedback is given No. 4 pins of chip after R6 dividing potential drop, C4 filtering; Resistance R 8, R9, R11, R12 constitute resistance pressure-dividing network, form the negative feedback loop of output voltage; Capacitor C 5 is connected between 1, No. 2 pins of chip, forms the compensating network of Voltage loop; Capacitor C 2, diode D12, D13, voltage-stabiliser tube ZD1 provide the starting resistor of chip when switching in system.

In described self-maintained circuit, inversion/booster circuit, resistance R 18 and capacitor C 10 are formed series resonant circuit, producing resonance signal intercouples through three windings of oscillating impulse transformer T3 and produces the high frequency square wave pulse of two opposite polarity phase places, make bipolar transistor Q2, the work of Q3 cycling switch, make the fluorescent lamp operate as normal by choke induction T4, T5 again.

In described protective circuit, the zero load and the overload signal of capacitor C 14, C15 sampling fluorescent tube, after R22, D11, R21, R20, D15 ballast, dividing potential drop, feedback drives the Q4SCR element, and resonant circuit is quit work.

Good effect of the present utility model is:

Energy-conservation: 1 and general Inductive ballast comparison he can accomplish 0.99 power factor, and general T8 Inductive ballast can only reach 0.50 power factor. waste that this just saves ample resources for the nervous problem of present electric power energy; 2, light efficiency value height drive a T6 type 36W solid mercury trichromatic fluorescent light tube and can reach 3145LM, and 40W general T 8 pipes can only be accomplished 1818LM that a T6 pipe can reach the almost effect of 2 T8 pipes, can save the energy of 4W simultaneously.

Environmental protection: it is 50Hz that traditional inductance type ballast adopts operating frequency, per second light flash 100 times, work and study under this light source, eyeball retina and optic nerve be because the influence of light source stroboscopic is tired easily, and people's eyesight is caused serious injury. adopt the electric ballast of this frequency conversion, operating frequency is more than 30KHz, per second glimmers more than 30,000 times, and light stability can reduce the visual fatigue that stroboscopic causes.This in addition solid mercury trichromatic fluorescent light tube uses mercury, bismuth, and indium alloy if discarded fluorescent tube fragmentation does not cause environmental pollution yet, meets environmental protection.

Long service life: common Inductive ballast in use start-up time long, repeatedly start fragile lamp cathode and starter life-span; The utlity model has preheat function, one-shot, but prolonging lamp tube service life, without starter, and the average life span of fluorescent tube itself is 16000 hours, is more than three times of common fluorescent tube.

Be convenient to change: the length of this T6 solid mercury trichromatic fluorescent light tube is the same with traditional T8, uses the client of T8 fluorescent tube to be replaced with ballast of the present utility model originally and also can use saving cost easy for installation.

In addition, the utlity model has the input voltage fluctuation automatic compensation function, power factor (PF) is higher, and oneself power consumption is lower; And has an ability that suppresses electromagnetic interference, radio frequency interference preferably; Have defencive functions such as lamp holder zero load, lamp holder overload, lamp holder short circuit, ultra under-pressure.

Description of drawings

Fig. 1 is the utility model schematic diagram

Fig. 2 is EMI filter circuit figure

Fig. 3 is the power factor compensation circuit diagram

Fig. 4 is self-maintained circuit, inversion/booster circuit figure

Fig. 5 is protective circuit figure

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 1; two straight pipe type electric ballasts are by the EMI filter circuit; rectification circuit; the power factor compensation circuit; self-maintained circuit; inversion/booster circuit; protective circuit is formed; 220V exchanges input and removes EMI (Electro Magnetic Interference) electromagnetic interference and RFI (Radio Frequency Interference) High-frequency Interference through the EMI filter circuit earlier; be direct current output through rectification again; pass through power factor compensation circuit corrected power factor then; under the control of self-maintained circuit, drive the fluorescent tube of two parallel connections through inversion/booster circuit output high voltage.

The EMI filter circuit adopts two ∏ filter design as shown in Figure 2 in the design, the two ∏ type EMI filter circuits by CA1, CA2, CY1, CY2, T1 element are formed utilize differential mode-common mode mode can effectively suppress EMI electromagnetic interference and RFI High-frequency Interference.Wherein two of inductance T1 windings are that symmetry is on same magnetic core, its both sides inductance value is identical, constitute two groups of symmetrical ∏ type electromagnetic interface filters with capacitor C A1, CA2, it is characterized in that: compensate mutually because the winding of T1 is the magnetic field that magnetic material produces on the same magnetic core, for asymmetric interference signal, the magnetic field that these two coils produce is mutual reinforcement, and the inductance that skin is revealed strengthens, and the interfere information of symmetry just has been suppressed.Equally to live wire AC (W) to the interference signal between ground wire, import in the earth behind the filter attenuation of forming by CA1, T1, CY1; Zero line AC (B) to the interference signal between ground wire, is imported in the earth behind the filter attenuation by capacitor C A1, T1, CY2 composition.

The design of this circuit presents high impedance to common mode interference signal, and difference mode signal and source current are presented Low ESR, so significantly the hot-tempered acoustical signal of the electric current in the decaying power supplies.In fact also be a kind of low pass filter in the design of this circuit,, also can effectively suppress the interference of radiofrequency signal because the T1 inductance plays the choked flow effect to radio frequency.This electromagnetic interface filter that the utility model adopts can effectively suppress to disturb from electric network electromagnet, and also attenuation of the electromagnetic interference that electric ballast self is produced can guarantee that electrical network is not contaminated simultaneously.

The power factor compensation circuit as shown in Figure 3.The Active Power Factor Correction special chip S6500P that this circuit adopts AUK company to produce.Can easily constitute wide voltage input (AC85V-265V), the APFC power supply of low harmonic content; Direct driven MOS pipe, and integrated various defencive functions; Because integrated level is very high, it has significantly reduced the required components and parts of construction system, has reduced loss, has improved efficient.Its principle is to be direct current with the input AC electricity through rectifier bridge D1 rectification, as the input of APFC active power factor compensating circuit; Capacitor C 1 reduces input current harmonics content in order to the HFS in the filtering inductive current; Resistance R 1, R2 and R3 constitute resistance pressure-dividing network, and in order to determine the waveform and the phase place of input voltage, capacitor C 3 constitutes a RC filter with resistance R 3, in order to remove the high-frequency interferencing signal of No. 3 pins; Inductance T2 has a secondary winding, and this winding is delivered to No. 5 pins of chip, the power supply during on the other hand as the chip operate as normal by resistance R 4 with the inductive current zero cross signal on the one hand; The chip drives signal is linked the gate pole of metal-oxide-semiconductor by resistance R 5, resistance R 7 parallel connections detect resistance as inductive current, rising edge (metal-oxide-semiconductor electric current) in order to the sampling inductive current, this resistance one is terminated at systematically, the other end is connected on the source electrode of metal-oxide-semiconductor simultaneously, after R6 dividing potential drop, C4 filtering with No. 4 pins of signal feedback chip; Resistance R 8, R9, R11, R12 constitute resistance pressure-dividing network, form the negative feedback loop of output voltage; Capacitor C 5 is connected between 1, No. 2 pins of chip, is used to form the compensating network of Voltage loop; Capacitor C 2, diode D12, D13, voltage-stabiliser tube ZD1 provide the starting resistor of chip when switching in system.Utilize the APFC circuit of this chip design to import 85VAC-265VAC at voltage, guarantee that output voltage stabilization is at 400V, the power factor of power-supply system is brought up to more than 0.99, and total harmonic distortion is lower than 10%, and the power supply of a high-quality is provided for the inversion of ballast.

Self-maintained circuit, inversion/booster circuit are as shown in Figure 4." self-excitation " formula oscillatory work mode of taking magnetic core to drive in the inversion design is utilized the Voltage Feedback resonance principle.Resistance R 18 and capacitor C 10 are formed series resonant circuit, produce the 38KHz resonance signal, back three windings by oscillating impulse transformer T3 intercouple and produce the high frequency square wave pulse of two opposite polarity phase places, make common bipolar transistor Q2, the work of Q3 cycling switch, make the fluorescent lamp operate as normal by choke induction T4, T5 again.

Protective circuit as shown in Figure 5.When lamp holder zero load, overload; circuit is by the signal of C14, the sampling of C15 element, and after R22, D11, R21, R20, D15 ballast, dividing potential drop, feedback drives the action of Q4SCR element; resonant circuit is quit work, can effectively reach protection fluorescent tube and ballast effect.

Claims (5)

1. two straight pipe type electric ballasts; form by EMI filter circuit, rectification circuit, power factor compensation circuit, self-maintained circuit, inversion/booster circuit, protective circuit; it is characterized in that: 220V exchanges input and removes EMI electromagnetic interference and RFI High-frequency Interference through the EMI filter circuit earlier; be direct current output through rectification again; pass through power factor compensation circuit corrected power factor then; under the control of self-maintained circuit, drive the fluorescent tube of two parallel connections through inversion/booster circuit output high voltage.

2. as claimed in claim 1 pair of straight pipe type electric ballast, it is characterized in that: described EMI filter circuit, form two ∏ type filter circuits by capacitor C A1, CA2, CY1, CY2, inductance T1, wherein two of inductance T1 windings are that symmetry is on same magnetic core, its both sides inductance value is identical, constitutes two groups of symmetrical ∏ type electromagnetic interface filters with capacitor C A1, CA2.

3. as claimed in claim 1 pair of straight pipe type electric ballast, it is characterized in that: described power factor compensation circuit adopts Active Power Factor Correction special chip S6500P, the input AC electricity is a direct current through rectifier bridge D1 rectification, as the input of APFC active power factor compensating circuit; HFS in the capacitor C 1 filtering inductive current; Resistance R 1, R2 and R3 constitute resistance pressure-dividing network, determine the waveform and the phase place of input voltage, and capacitor C 3 constitutes the RC filter with resistance R 3, removes the high-frequency interferencing signal of No. 3 pins; Inductance T2 secondary winding on the one hand is delivered to No. 5 pins of chip, the power supply during on the other hand as the chip operate as normal by resistance R 4 with the inductive current zero cross signal; The chip drives signal is linked the gate pole of metal-oxide-semiconductor by resistance R 5, and resistance R 7 parallel connections detect resistance as inductive current, and this resistance one is terminated at systematically, and the other end is connected on the source electrode of metal-oxide-semiconductor, signal feedback is given No. 4 pins of chip after R6 dividing potential drop, C4 filtering; Resistance R 8, R9, R11, R12 constitute resistance pressure-dividing network, form the negative feedback loop of output voltage; Capacitor C 5 is connected between 1, No. 2 pins of chip, forms the compensating network of Voltage loop; Capacitor C 2, diode D12, D13, voltage-stabiliser tube ZD1 provide the starting resistor of chip when switching in system.

4. as claimed in claim 1 pair of straight pipe type electric ballast, it is characterized in that: in described self-maintained circuit, inversion/booster circuit, resistance R 18 and capacitor C 10 are formed series resonant circuit, producing resonance signal intercouples through three windings of oscillating impulse transformer T3 and produces the high frequency square wave pulse of two opposite polarity phase places, make bipolar transistor Q2, the work of Q3 cycling switch, make the fluorescent lamp operate as normal by choke induction T4, T5 again.

5. as claimed in claim 1 pair of straight pipe type electric ballast; it is characterized in that: in described protective circuit; the zero load and the overload signal of capacitor C 14, C15 sampling fluorescent tube; after R22, D11, R21, R20, D15 ballast, dividing potential drop; feedback drives the Q4SCR element, and resonant circuit is quit work.

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