CN201657464U

CN201657464U - electronic ballast

Info

Publication number: CN201657464U
Application number: CN2010201090375U
Authority: CN
Inventors: 戚军
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2010-01-28
Filing date: 2010-01-28
Publication date: 2010-11-24
Anticipated expiration: 2020-01-28

Abstract

The utility model relates to an electronic ballast comprising an input filter, a DC-DC flyback converter and a DC-AC full bridge inverter circuit which are in cascade connection in turn, wherein a battery is connected to the front end of the input filter; a continue-arc circuit and a firing circuit with a voltage-multiplying parallel structure are connected on the DC-AC full bridge inverter circuit in parallel; the firing circuit with a voltage-multiplying parallel structure comprises a voltage-multiplying circuit, a booster circuit , an isolation high-voltage diode and a relay; the output end of the voltage-multiplying circuit is connected with the continue-arc circuit and the booster circuit; the booster circuit is connected with the isolation high-voltage diode and a high-voltage gas discharge lamp in parallel; and the high-voltage gas discharge lamp and the relay are connected in parallel. The utility model has the advantages of that the volume of a firing transformer is reduced, and the total efficiency of the electronic ballast of the high-voltage gas discharge lamp is improved; the voltage value of an energy-storage capacitor in the continue-arc circuit is improved, an arc-maintaining function is effectively finished, and the once firing successful rate of the high-voltage gas discharge lamp is improved; and the total cost is reduced.

Description

Electric ballast

Technical field

The utility model relates to a kind of electric ballast that is used for high-voltage gas discharging light.

Background technology

Electronic ballast for high-pressure discharge lamp comprises high-tension ignition circuit and stable state power supply circuit, and firing circuit generally can adopt with the stable state power supply circuit and connect and parallel way.The stable state power supply circuit comprises DC voltage booster circuit and full bridge inverter.The high-pressure generating circuit of firing circuit generally has single-stage booster circuit, twin-stage booster circuit.

The single-stage booster circuit of series connection, as shown in Figure 1, this circuit generally requires the turn ratio very high, and because of high-tension coil flows through lamp current, used lead can not be too thin, can make very big that the high-tension transformer volume does like this.

Single-stage booster circuit in parallel, as shown in Figure 2, that the high-pressure side winding wire can be done is very thin, the other ballast inductance but lamp need be connected, the volume of electronic ballast system also can be very big like this.

The twin-stage booster circuit, as shown in Figure 3, when producing high pressure, the high-pressure side winding plays the effect of electric ballast inductance, can reduce the volume and weight of system.Employing adds the way of auxiliary winding at the secondary of the anti-violent change depressor of prime, but has increased the volume and the manufacture difficulty of anti-violent change depressor.

In order to reduce volume of transformer, can produce high pressure again, existing firing circuit adopts multiplication of voltage series connection point ignition circuit structure, as shown in Figure 4.Adopt the electric ballast of multiplication of voltage series connection point ignition circuit to comprise input filter, anti exciting converter, continuous arc circuit, full bridge inverter, voltage-multiplying circuit, cascaded structure firing circuit, utilize anti exciting converter output stage voltage doubling rectifing circuit, only used the first class boost transformer, can reduce the turn ratio of transformer, can not increase the volume of transformer.But when high-voltage gas discharging light is carried out high-tension ignition at every turn and in the start-up course, the capital makes an electrode in two electrodes of fluorescent tube be fixed as anode, another electrode is fixed as negative electrode, such high-tension ignition circuit structure and start-up course, can make reduce greatly the useful life of high-voltage gas discharging light, and firing circuit efficient is low.

Summary of the invention

There is inefficient problem in the multiplication of voltage tandem firing circuit that the utility model will solve existing electric ballast, the electric ballast that provides a kind of efficient height, structure letter to gather.

The technical solution of the utility model:

Electric ballast, comprise the input filter that is used to cut off the High-frequency Interference between storage battery and this device that cascade successively connects, be used for the DC-DC anti exciting converter of the direct voltage rising that is input as the storage battery grade, be used for high voltage direct current is transformed to the DC-AC full bridge inverter of high-voltage square-wave voltage, the front end of described input filter is connected with storage battery, it is characterized in that: be connected in parallel on the described DC-AC full bridge inverter when two electrodes of high-voltage gas discharging light are breakdown, the continuous arc circuit and the multiplication of voltage parallel-connection structure firing circuit of energy is provided for high-voltage gas discharging light momently; Described multiplication of voltage parallel-connection structure firing circuit comprises voltage-multiplying circuit, booster circuit, obstruct high-voltage diode, relay, the output of described voltage-multiplying circuit is connected with continuous arc circuit and booster circuit, described booster circuit is in parallel with obstruct high-voltage diode and high-voltage gas discharging light, and described high-voltage gas discharging light is in parallel with relay;

Described multiplication of voltage parallel-connection structure firing circuit, be used to produce the high pressure that punctures two electrodes of high-voltage gas discharging light, described obstruct high-voltage diode is used to prevent that the high voltage of time of ignition from burning out the element of continuous arc circuit, voltage-multiplying circuit, DC-AC full bridge inverter, and described relay is used to keep the normally luminous of high-pressure discharge lamp.

Further, described voltage-multiplying circuit comprises the 3rd electric capacity, first end of described the 3rd electric capacity links to each other with the anode of the output of DC-DC anti exciting converter and first diode, the negative electrode of described first diode links to each other with first end of clamping capacitance, the anode of second diode and second end of the 4th electric capacity, the negative electrode of described second diode links to each other with second end of the 3rd electric capacity and the anode of the 3rd diode, and the negative electrode of described the 3rd diode links to each other with first end, booster circuit and the continuous arc circuit of the 4th electric capacity.

Further, described continuous arc circuit comprises first resistance and the 4th diode in parallel, the parallel connected end of the negative electrode of the 4th diode and first resistance links to each other with the 6th electric capacity first end of stored energy, described the 6th electric capacity second end links to each other with second resistance, first end, and described second resistance, second end is connected the output of voltage-multiplying circuit.

Further, described booster circuit comprises current-limiting resistance, described current-limiting resistance first end links to each other with the output of voltage-multiplying circuit, second end of described current-limiting resistance links to each other with igniting electric capacity first end and gas discharge tube first end, the described igniting electric capacity second end ground connection, second end of described gas discharge tube links to each other with low-pressure side first end of ignition transformer, high-pressure side first end of described ignition transformer links to each other with first end that intercepts low frequency electric capacity, second end of described obstruct low frequency electric capacity links to each other with an end of first end of high-voltage gas discharging light and relay, second end of described high-voltage gas discharging light links to each other with high-pressure side second end of ignition transformer and the 3rd inductance of DC-AC full bridge inverter, and the other end of described relay links to each other with second inductance of DC-AC full bridge inverter.

The start-up course of high-voltage gas discharging light is divided into to voltage breakdown, glow discharge, aura change arc discharge, arc discharge four-stages such as (steady operations) from transient state to stable state, concrete as shown in Figure 5 status transition process.The length of transient state time is relevant with the watt level that aura changes arc light stage supply fluorescent tube, give fluorescent tube if during aura changes arc light, add a bigger power, speeding up that lamp hole temperature rises will be made, and shortened the transient state time of high-voltage gas discharging light, make fluorescent tube can enter steady operation faster.

Between the starting period, electric ballast will experience that high-voltage breakdown, electric current continue, 3 stages of preheating arc maintenance.High-voltage starting circuit is the basis that can high-voltage gas discharging light instant igniting.But the delay of inertia and filter circuit makes DC converter and detects the loop and has been difficult to response speed faster after the glow discharge, so electric ballast the inside will comprise electric current (take-over) circuit that continues, it with electric capacity in advance energy stored provide a bigger immediate current for lamp, guarantee the reliable transition of aura to arc light.

The utility model course of work is described below: the startup stage, control program carries out the constant voltage closed loop to the terminal voltage of the bus capacitor of full bridge inverter.The output of voltage-multiplying circuit is given the ignition capacitor charging of booster circuit by current-limiting resistance, after the magnitude of voltage at ignition capacitor two ends arrives the puncture voltage of gas discharge tube, ignition capacitor transfers energy to the high-pressure side simultaneously by the low-pressure side discharge of ignition transformer.Form closed loop by ignition transformer high pressure winding, obstruct low frequency capacitor, high-voltage gas discharging light, the upper end electrode of high-voltage gas discharging light is born positive high pressure, makes high-voltage gas discharging light puncture.

In the afterflow stage, the loop that continuous arc circuit, obstruct high-voltage diode, high-voltage gas discharging light are formed makes high-voltage gas discharging light reach the function of arc maintenance.

Change arc light and after the arc discharge stage, relay closes, so just can obtain the alternating current of 400Hz when high-voltage gas discharging light enters aura, keep the normally luminous of high-voltage gas discharging light in lamp tube ends by program control.

The beneficial effects of the utility model: reduced the volume of ignition voltage device, improved the whole efficiency of electronic ballast for high-pressure discharge lamp; Improve the magnitude of voltage of storage capacitor in the continuous arc circuit, finished the function of arc maintenance more effectively, improved an ignition success rate of high-voltage gas discharging light; Reduced whole cost.

Description of drawings

Fig. 1 is the structural representation that high-voltage gas discharging light and ignition coil high-pressure side are in series.

Fig. 2 is the structural representation that high-voltage gas discharging light and ignition coil high-pressure side are in parallel.

Fig. 3 is the structural representation of the two-stage boost ignition circuit of high-voltage gas discharging light.

Fig. 4 is existing multiplication of voltage tandem firing circuit schematic diagram.

Fig. 5 is that high-voltage gas discharging light is from the breakdown transient state transient process schematic diagram to permanent power steady operation of electrode.

Fig. 6 is circuit theory diagrams of the present utility model.

Embodiment

With reference to Fig. 6, electric ballast, comprise the input filter 2 that is used to cut off the High-frequency Interference between storage battery 1 and this device that cascade successively connects, be used for the DC-DC anti exciting converter 4 of the direct voltage rising that is input as storage battery 1 grade, be used for high voltage direct current is transformed to the DC-AC full bridge inverter 6 of high-voltage square-wave voltage, the front end of described input filter 2 is connected with storage battery 1, is connected in parallel to continuous arc circuit 5 and multiplication of voltage parallel-connection structure firing circuit 3 that energy is provided for high-voltage gas discharging light when two electrodes of high-voltage gas discharging light are breakdown momently on the described DC-AC full bridge inverter 6; Described multiplication of voltage parallel-connection structure firing circuit 3 comprises voltage-multiplying circuit, booster circuit, obstruct high-voltage diode D5, relay, the output of described voltage-multiplying circuit is connected with continuous arc circuit 5 and booster circuit, described booster circuit is in parallel with obstruct high-voltage diode D5 and high-voltage gas discharging light, and described high-voltage gas discharging light is in parallel with relay;

Described multiplication of voltage parallel-connection structure firing circuit 3, be used to produce the high pressure that punctures two electrodes of high-voltage gas discharging light, described obstruct high-voltage diode D5 is used to prevent that the high voltage of time of ignition from burning out the element of continuous arc circuit 5, voltage-multiplying circuit, DC-AC full bridge inverter 6, and described relay is used to keep the normally luminous of high-pressure discharge lamp.

Described voltage-multiplying circuit comprises the 3rd capacitor C 3, first end of described the 3rd capacitor C 3 links to each other with the anode of the output of DC-DC anti exciting converter 4 and the first diode D1, the negative electrode of the described first diode D1 links to each other with first end of clamping capacitance Co, the anode of the second diode D2 and second end of the 4th capacitor C 4, the negative electrode of the described second diode D2 links to each other with second end of the 3rd capacitor C 3 and the anode of the 3rd diode D3, and the negative electrode of described the 3rd diode D3 links to each other with first end, booster circuit and the continuous arc circuit 5 of the 4th capacitor C 4.

Described continuous arc circuit 5 comprises first resistance R 1 and the 4th diode D4 in parallel, the parallel connected end of the negative electrode of the 4th diode D4 and first resistance R 1 links to each other with the 6th capacitor C 6 first ends of stored energy, described the 6th capacitor C 6 second ends link to each other with second resistance R, 2 first ends, and described second resistance R, 2 second ends are connected the output of voltage-multiplying circuit.

Described booster circuit comprises current-limiting resistance R3, described current-limiting resistance R3 first end links to each other with the output of voltage-multiplying circuit, second end of described current-limiting resistance R3 links to each other with igniting capacitor C 5 first ends and gas discharge tube S.G first end, described igniting capacitor C 5 second end ground connection, second end of described gas discharge tube S.G links to each other with low-pressure side first end of ignition transformer T2, high-pressure side first end of described ignition transformer T2 links to each other with first end that intercepts low frequency capacitor C 7, second end of described obstruct low frequency capacitor C 7 links to each other with an end of first end of high-voltage gas discharging light and relay, second end of described high-voltage gas discharging light links to each other with high-pressure side second end of ignition transformer T2 and the 3rd inductance L 3 of DC-AC full bridge inverter 6, and the other end of described relay links to each other with second inductance L 2 of DC-AC full bridge inverter 6.

The utility model course of work is described below: the startup stage, control program carries out the constant voltage closed loop to the terminal voltage of the bus capacitor of full bridge inverter 6.The output of voltage-multiplying circuit is given the ignition capacitor C5 charging of booster circuit by current-limiting resistance R3, after the magnitude of voltage at ignition capacitor C5 two ends arrives the puncture voltage of gas discharge tube S.G, ignition capacitor C5 transfers energy to the high-pressure side simultaneously by the low-pressure side discharge of ignition transformer T2.Form closed loop by ignition transformer T2 high pressure winding, obstruct low frequency capacitor C 7, high-voltage gas discharging light, the upper end electrode of high-voltage gas discharging light is born positive high pressure, makes high-voltage gas discharging light puncture.

In the afterflow stage, the 6th capacitor C 6 of the stored energy in the continuous arc circuit 5 makes high-voltage gas discharging light reach the function of arc maintenance by the loop of being made up of the 4th diode D4, second resistance R 2, obstruct high-voltage diode D5, high-voltage gas discharging light, the 3rd inductance L 3 and S4.

The described content of this specification embodiment only is enumerating the way of realization of utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.

Claims

1. Electronic ballast, including the input filter used to cut off the high-frequency interference between the battery and the device connected in series, and the DC-DC flyback conversion used to increase the DC voltage input to the battery level A device, a DC-AC full-bridge inverter circuit for converting high-voltage direct current into a high-voltage square wave voltage, the front end of the input filter is connected to a storage battery, and it is characterized in that: the DC-AC full-bridge inverter circuit is connected in parallel When the two electrodes of the high-pressure gas discharge lamp are broken down, an arc-continuing circuit and a voltage-doubler parallel structure ignition circuit briefly providing energy for the high-pressure gas discharge lamp are connected; the voltage doubler parallel structure ignition circuit includes a voltage doubler circuit, Booster circuit, blocking high-voltage diode, relay, the output end of the voltage doubler circuit is connected with a continuous arc circuit and a boosting circuit, the boosting circuit is connected in parallel with the blocking high-voltage diode and the high-pressure gas discharge lamp, and the high-pressure gas discharge lamp in parallel with the relay;

The voltage doubling parallel structure ignition circuit is used to generate a high voltage that breaks through the two electrodes of the high pressure gas discharge lamp, and the barrier high voltage diode is used to prevent the high voltage at the ignition moment from disabling the continuous arc circuit, the voltage doubling circuit, and the DC-AC all The components of the bridge inverter circuit are burned out, and the relay is used to maintain the normal light emission of the high-pressure discharge lamp.

2. The electronic ballast according to claim 1, wherein the voltage doubling circuit comprises a third capacitor, the first end of the third capacitor is connected to the output end of the DC-DC flyback converter and the first end of the third capacitor. The anode of a diode is connected, the cathode of the first diode is connected with the first end of the clamp capacitor, the anode of the second diode and the second end of the fourth capacitor, the second diode The cathode of the third diode is connected with the second terminal of the third capacitor and the anode of the third diode, and the cathode of the third diode is connected with the first terminal of the fourth capacitor, the boost circuit and the arc continuing circuit.

3. The electronic ballast according to claim 1 or 2, characterized in that: the arc continuing circuit comprises a first resistor and a fourth diode connected in parallel, the cathode of the fourth diode and the first resistor The parallel terminal is connected to the first terminal of the sixth capacitor for storing energy, the second terminal of the sixth capacitor is connected to the first terminal of the second resistor, and the second terminal of the second resistor is connected to the output terminal of the voltage doubler circuit.

4. The electronic ballast according to claim 3, characterized in that: the boost circuit includes a current limiting resistor, the first end of the current limiting resistor is connected to the output end of the voltage doubler circuit, and the current limiting resistor The second end of the ignition capacitor is connected to the first end of the ignition capacitor and the first end of the gas discharge tube, the second end of the ignition capacitor is grounded, the second end of the gas discharge tube is connected to the first end of the low-voltage side of the ignition transformer, and the The first end of the high-voltage side of the ignition transformer is connected to the first end of the blocking low-frequency capacitor, the second end of the blocking low-frequency capacitor is connected to the first end of the high-pressure gas discharge lamp and one end of the relay, and the first end of the high-pressure gas discharge lamp The two ends are connected with the second end of the high-voltage side of the ignition transformer and the third inductance of the DC-AC full-bridge inverter circuit, and the other end of the relay is connected with the second inductance of the DC-AC full-bridge inverter circuit.