CN2497508Y

CN2497508Y - Electronic ballast for high-intensity gas-discharge lamp

Info

Publication number: CN2497508Y
Application number: CN 01243074
Authority: CN
Inventors: 郑庆邦
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-10
Filing date: 2001-08-10
Publication date: 2002-06-26
Anticipated expiration: 2011-08-10

Abstract

The utility model discloses an electronic ballast for a high strength gas discharge lamp, comprising an incoming feeder filter, a rectifier circuit, a power factor correction circuit, a high frequency constant current transform circuit, a trigger circuit, and an auxiliary power. An alternating city current is filtered and rectified through the incoming feeder filter and the rectifier circuit into a pulsating direct current which is input into the power factor correction circuit, the output terminal of which outputs stable direct voltage into the high frequency constant current transform circuit which is transformed into a direct current with constant current characteristics which is output to an HID lamp load L. The trigger circuit is used for glowing the HID lamp. The auxiliary power converts city voltage into low voltage which is supplied to the high frequency constant current transform circuit. The ballast is easy and cheap, and can effectively solve the acoustic vibration of the HID lamp.

Description

The electric ballast that high-intensity gas discharge lamp is used

Technical field

The utility model relates to the electric ballast of a kind of high-intensity gas discharge lamp (HID lamp) usefulness, belongs to the illumination electronic technology field.

Background technology

Existing HID lamp electronic ballast generally adopts high-frequency current that lamp is powered.When adopting high-frequency current to light the HID lamp, the pulsation of fluorescent tube internal pressure ripple fires back from inside pipe wall, if identically with the ripple component phase place of high-frequency current then can form standing wave, produces sound oscillation.Sound oscillation takes place in high-frequency current frequency especially easily in the 8-150KHZ scope.The sound oscillation meeting causes light flash, and lamp power instability is when serious even burn the HID lamp.

In order to solve HID lamp sound oscillation problem, many schemes have been proposed both at home and abroad." the white noise modulation of high frequency high intensity gas discharge lamp ballast " (IEEE of people such as Laszlo Laskai, the first phase in 1994,1953 pages of ff) proposed in should be with the high-frequency current of the frequency of change at random or phase place to the power supply of HID lamp to solve the sound oscillation problem.But this just need be increased to the quite complicated and expensive electronic circuit of a cover in the HID lamp electronic ballast and go.

Summary of the invention

The utility model provides a kind of simple, inexpensive electric ballast to solve the sound oscillation problem of HID lamp.

The electric ballast that high-intensity gas discharge lamp described in the utility model is used comprises the inlet wire filter, rectification circuit, circuit of power factor correction, high frequency constant current translation circuit, circuits for triggering, accessory power supply, it is characterized in that: the 220V alternating current is imported from the inlet wire filter, consider and go interference signal after the rectification of over commutation circuit becomes pulsating direct current, add to circuit of power factor correction, output output galvanic current at circuit of power factor correction is depressed into high frequency constant current translation circuit, and the direct current that converts the band constant-current characteristics through high frequency constant current translation circuit to exports HID lamp load L to; Circuits for triggering are connected with the load of HID lamp, and it produces high-voltage pulse with to HID lamp starter; Accessory power supply converts line voltage to low-voltage power supply and gives high frequency constant current translation circuit.

For power supply is whenever being closed when once restarting, the polarity of voltage conversion at HID lamp two ends once makes HID lamp two end electrodes can access essentially identical emission and receives time of electronics, to prolong the life-span of HID lamp; Have additional a polarity switching between high frequency constant current translation circuit and HID lamp load L, high frequency constant current translation circuit converts the required voltage of HID lamp to and exports on the polarity switching, adds on the HID lamp load L by polarity switching; Also have a polarity switch control circuit, its break-make according to mains switch is sent the voltage that control signal control high frequency constant current translation circuit changes to HID lamp load L output polarity; Accessory power supply also converts line voltage to low-voltage power supply simultaneously and gives polarity switch control circuit.

The DC power supply of ballast metal v-belt constant-current characteristics described in the utility model and power stability has just fundamentally solved the problem of sound oscillation to the power supply of HID lamp.And this power supply whenever closing when once restarting, and the polarity of voltage conversion at HID lamp two ends once makes HID lamp two end electrodes can access essentially identical emission and receives time of electronics, to prolong the life-span of HID lamp.

Description of drawings

The circuit block diagram of Fig. 1 ballast described in the utility model;

One of physical circuit figure of Fig. 2 ballast described in the utility model;

One of physical circuit figure of Fig. 3 ballast described in the utility model.

Embodiment

As shown in Figure 1, the electric ballast used of high-intensity gas discharge lamp described in the utility model comprises inlet wire filter 1, rectification circuit 2, circuit of power factor correction 3, high frequency constant current translation circuit 4,

polarity switching

6,7, polarity switch control circuit 9, circuits for triggering 8, accessory power supply 10; The 220V alternating current is from 1 input of inlet wire filter, consider and go interference signal after 2 rectifications of over commutation circuit become pulsating direct current, add to circuit of power factor correction 3, be depressed into high frequency constant current translation circuit 4 at the output of circuit of power factor correction 3 output galvanic current, the direct current that converts the band constant-current characteristics to through high frequency constant current translation circuit exports on the polarity switching 6,7 and keeps the stable of this output voltage; Polarity switching 6,7 is connected with HID lamp load L, and polarity switch control circuit 9 sends the voltage that control signal control high frequency constant

current translation circuit

6,7 changes to HID lamp load L output polarity according to the break-make of mains switch; Circuits for triggering 8 are connected with the load L of HID lamp, and it produces high-voltage pulse with to HID lamp starter; Accessory power supply 10 converts line voltage to low-voltage power supply and gives high frequency constant current translation circuit 4 and polarity switch control circuit 9.

Shown in Fig. 2,3, bridge rectifier 2 rectifications that the alternating current of civil power input is formed through D1-D4 after interference signal is gone in inlet wire filter 1 worry that C1, C2, B2 form become pulsating direct current, add to the step-up type power factor correcting circuit of forming by IC1, B3, Q1, D7, C8 etc. (APFC), obtain galvanic current presses (when civil power is input as the 220V alternating current at the C8 two ends, the C8 two ends are the 400V direct current), IC1 is TDA4862.IC2, Q2, D8, L1, C9 etc. form decompression transducer (BUCK converter), IC2 is a current mode P.W.M controller, frequency drives Q2 with 30KHZ-100KHZ carries out copped wave to C8 two ends direct voltage, the current design that flows through on the inductance L 1 becomes continuous, to reduce the pulsation of C9 both end voltage.When unloaded (when HID lamp load L is unignited), C9 both end voltage and C8 both end voltage are basic identical, are ceiling voltage, and this is quite favourable to lighting the HID lamp.(the HID lamp is lighted the back) is according to the burning-point characteristic of HID lamp during load, the equivalent resistance of lamp constantly changes, lamp current also changes thereupon, 3 pin of IC2 are obtained current feedback by R10, R11, regulate the P.W.M pulse duration, make-and-break time by 6 pin, R12 control Q2 makes the voltage at C9 two ends and lamp current stable, and the HID lamp is stable to be lighted.Memory IC 3 (EEPROM), single-chip microcomputer IC4 (MPU), Q3 and relay J 1 etc. are formed polarity switch control circuit 9 and polarity switching 6,7, the every break-make of mains switch once, accessory power supply+V2 also can break-make once, the 2 pin output states of IC4 can change once.Be the 2 pin output low levels of original IC4, when+V2 disconnects once energising again, the 2 pin outputs of IC4 can become high level, the conversion of two groups of contact J1-1 and J1-2 by Q3 control relay J1, the polarity of voltage at HID lamp load L two ends is changed thereupon, realized polar switching.R15, C10, D9, L3, L2 form high-voltage pulse and produce circuits for triggering, L2, D9 and C10 form a loop, wherein L2 connects the end of L3 between D9, the end of the other termination load L of L3, connect the negative pole of capacitor C 9 between L2 and the C10, connect the positive pole of capacitor C 9 and the other end of load L by resistance R 15 between D9 and the C10.When unloaded, the C9 both end voltage is the highest, by R15 C10 is charged, when the C10 both end voltage is charged to the conducting breakover voltage of silicon bidirection switch D9, the D9 conducting, C10 discharges to L2 by D9, L2 is about 1: 30 with L3 number of turns ratio, so the pulse voltage that can induce several KV on the L3 is to HID lamp high pressure starter.After the HID lamp was lighted, the C9 both end voltage reduced, and the charging voltage on the C10 is not enough to puncture D9, promptly automatically shuts down the high-voltage pulse circuits for triggering.

The foregoing description is as just a kind of application scheme of the present utility model, and the utility model changes on can and arranging in its form, do not light the HID lamp and instructed notion with what HID voltage of both ends of lamp polarity changed and do not break away from direct current.

Claims

1, the electric ballast that a kind of high-intensity gas discharge lamp is used, comprise inlet wire filter (1), rectification circuit (2), circuit of power factor correction (3), high frequency constant current translation circuit (4), circuits for triggering (8), accessory power supply (10), it is characterized in that: the 220V alternating current is imported from inlet wire filter (1), consider and go interference signal after over commutation circuit (2) rectification becomes pulsating direct current, add to circuit of power factor correction (3), output output galvanic current at circuit of power factor correction (3) is depressed into high frequency constant current translation circuit (4), and the direct current that converts the band constant-current characteristics through high frequency constant current translation circuit (4) to exports HID lamp load L to; Circuits for triggering (8) are connected with the load of HID lamp, and it produces high-voltage pulse with to HID lamp starter; Accessory power supply (10) converts line voltage to low-voltage power supply and gives high frequency constant current translation circuit.

2, the electric ballast of using by the described high-intensity gas discharge lamp of claim 1, it is characterized in that: have additional a polarity switching (6,7) between high frequency constant current translation circuit (4) and the HID lamp load L, high frequency constant current translation circuit (4) converts the required voltage of HID lamp to and exports on the polarity switching (6,7), add on the HID lamp load L by polarity switching (6,7); Also have a polarity switch control circuit (9), its break-make according to mains switch is sent the voltage that control signal control high frequency constant current translation circuit (6,7) changes to HID lamp load L output polarity; Accessory power supply (10) also converts line voltage to low-voltage power supply and gives polarity switch control circuit (9).

3, the electric ballast of using by the described high-intensity gas discharge lamp of claim 2, it is characterized in that: accessory power supply (10) is one the transformer B1 of two outputs to be arranged, civil power convert to low pressure+V1 ,+V2 imports high frequency constant current translation circuit (4) and polarity switch control circuit (9) respectively; Inlet wire filter (1), comprise capacitor C 1, C2 and inductance L 5, bridge rectifier (2) rectification that the alternating current of civil power input is formed through diode D1-D4 after interference signal is gone in inlet wire filter (1) worry becomes pulsating direct current, adds to circuit of power factor correction (3); Circuit of power factor correction (3) is a step-up type power factor correcting circuit (APFC) of being made up of APFC controller IC 1, inductance L 4, triode Q1, diode D7, capacitor C 8 etc., obtains galvanic current at the two ends of its capacitor C 8 and presses and transport to high frequency constant current translation circuit (4); High frequency constant current translation circuit (4) is by current mode P.W.M controller IC 2, triode Q2, diode D8, inductance L 1, capacitor C 9 grades are formed the buck translation circuit, its frequency drives triode Q2 with 30KHZ-100KHZ carries out copped wave to capacitor C 8 two ends direct voltages, the continuous current that flows through on the inductance L 1 is at last at the required burning voltage of capacitor C 9 two ends output HID lamp, after lighting the HID lamp, the equivalent resistance of HID lamp constantly changes, lamp current also changes thereupon, 3 pin of IC2 pass through R10, R11 obtains current feedback, regulate the P.W.M pulse duration, by 6 pin, the make-and-break time of R12 control Q2 makes the voltage at C9 two ends and lamp current stable; The voltage of capacitor C 9 two ends output adds to polarity switching (6,7), polarity switching (6,7) be one the switching relay J1 of two groups of contact J1-1 and J1-2 to be arranged, the voltage at C9 two ends is added on contact J1-1 and the J1-2, J1-1 and J1-2 are connected with the two ends of HID lamp load L, the connection at the two poles of the earth of itself and load L is controlled by by memory IC 3, single-chip microcomputer IC4, triode Q3 etc. form polarity switch control circuit (9), the every break-make of mains switch once, accessory power supply+V2 also can break-make once, the 2 pin output states of single-chip microcomputer IC4 can change once between low level and high level, the conversion of two groups of contact J1-1 and J1-2 by triode Q3 control relay J1 changes the polarity of voltage at HID lamp load L two ends thereupon; Resistance R 15, capacitor C 10, silicon bidirection switch D9, inductance L 3, L2 form high-voltage pulse and produce circuits for triggering, L2, D9 and C10 form a loop, wherein L2 connects the end of L3 between D9, the end of the other termination load L of L3, connect the negative pole of capacitor C 9 between L2 and the C10, connect the positive pole of capacitor C 9 and the other end of load L by resistance R 15 between D9 and the C10.

4, the electric ballast of using by the described high-intensity gas discharge lamp of claim 3 is characterized in that: L2 is 1: 30 with L3 number of turns ratio.

5, the electric ballast of using by the described high-intensity gas discharge lamp of claim 3 is characterized in that: the model of IC1 is that TDA4862, IC3 are that EEPROM, IC4 are MPU.