CN203352925U

CN203352925U - An electrical ballast with multiple power gears

Info

Publication number: CN203352925U
Application number: CN2013204288752U
Authority: CN
Inventors: 李少卿; 蒋中为
Original assignee: Shenzhen Techone Tech Co Ltd
Current assignee: Shenzhen Techone Tech Co Ltd
Priority date: 2013-07-18
Filing date: 2013-07-18
Publication date: 2013-12-18
Anticipated expiration: 2023-07-18

Abstract

The utility model provides an electrical ballast with multiple power gears. The electrical ballast comprises an electromagnetism compatible circuit, a power factor correction circuit, a ballast output circuit and a frequency-adjustable drive circuit. The frequency-adjustable drive circuit generates a frequency-adjustable square signal and outputs the square signal to the ballast output circuit. The beneficial effects of the electrical ballast are that: according to a lamp of different power gears, an output power gear is pre-adjusted correspondingly, frequency value of the power-adjusting drive portion is modified through signals, then a DC-AC circuit is adjusted, and inductive reactance of the output ballast inductance is changed, so that the output powers of the electrical ballast are matched with those of a high-voltage sodium lamp, finally, the electrical ballast needs not to be replaced, and the purpose of bringing the performance and effect of the high-voltage sodium lamp into full play is achieved.

Description

A kind of many power gears electric ballast

Technical field

The utility model relates to the ballast field of HID lamp, particularly a kind of many power gears electric ballast.

Background technology

Ballast refers in order to overcome the negative resistance charactertistic of gas discharge type electric light source, enables normal operation and the matching used electric equipment that adds.Electric ballast (Electrical ballast), refer to and adopt electronic technology to drive electric light source, makes it to produce the electronic equipment of required illumination.Modern fluorescent lamp more and more uses electric ballast, light small and exquisite, even electric ballast and fluorescent tube etc. can be integrated, and simultaneously, electric ballast can have the starter function concurrently usually, so can save independent starter again.

At present, electric ballast is to be configured according to the rated power of output lamp, the electric ballast of the HID lamp configuration corresponding power of certain power.When needs are realized other power, or more change the bulb, change electric ballast simultaneously.More do not change the bulb, change by force output power of electronic ballast and realize that power output changes.As long as power output needs to change, will need to change electric ballast in a word, will cause like this cost to rise.

The utility model content

The purpose of this utility model is for when needs change power output, must change the electric ballast of different output power, the deficiency that causes cost to rise, provide a kind of electric ballast of many power gears, utilize an electric ballast output can with the HID lamp compatibility of multiple power.

The technical solution of the utility model is: a kind of electric ballast of many power gears, comprise electromagnetic compatibility circuit, circuit of power factor correction and ballast output circuit, and also comprise the adjustable frequency drive circuit; The square-wave signal that described adjustable frequency drive circuit produces adjustable frequency outputs to described ballast output circuit.

Further, in the electric ballast of above-mentioned many power gears: described adjustable frequency drive circuit comprises that the complementary PWM of a two-way drives chip; The complementary PWM of described two-way drives the 6th pin of chip to connect the described square-wave signal output frequency that control signal is controlled the 11st pin and the output of the 14th pin.

Further, in the electric ballast of above-mentioned many power gears: described ballast output circuit comprises isolating transformer, field effect transistor Q2, field effect transistor Q3, inductance T4, inductance T5; In described isolating transformer primary coil two termination adjustable frequency drive circuits, the complementary PWM of two-way drives the 11st pin and the output of the 14th pin of chip; The grid of the described field effect transistor Q2 of out-phase termination of the second subprime coil of described isolating transformer, the source class of field effect transistor Q2 connects the 400V direct current, and the drain electrode of field effect transistor Q2 is connected with the HID lamp by described inductance T4, inductance T5; The grid of the described field effect transistor Q3 of homophase termination of the coil of level for the third time of described isolating transformer, the source electrode of field effect transistor Q3 connects the grid of field effect transistor Q2, and the drain electrode of field effect transistor Q3 connects testing circuit.

Further, in the electric ballast of above-mentioned many power gears: also comprise that power conditioning circuitry and current signal detect, error amplifying circuit; Described power conditioning circuitry output voltage signal through described current signal detect, error amplifying circuit is linked into described adjustable frequency drive circuit after amplifying.

Further, in the electric ballast of above-mentioned many power gears: also comprise protective circuit, described protective circuit generation control signal is controlled described adjustable frequency drive circuit and is stopped exporting square-wave signal.

The beneficial effects of the utility model are, bulb according to the different capacity gear, mix up in advance corresponding with it power output gear, change the frequency values of power adjustments drive part by signal, and then adjusting DC-AC circuit, change the induction reactance of output ballast inductance, make electric ballast output and high-pressure sodium lamp coupling used.Finally reach and do not change electric ballast, give full play to again the purpose of high-pressure sodium lamp performance, effect.

Below with reference to drawings and Examples, the utility model is described in detail.

The accompanying drawing explanation

Fig. 1 is the utility model embodiment 1 block diagram.

Fig. 2 is power adjustments part schematic diagram in Fig. 1.

Fig. 3 is that Fig. 1 current signal detects, error amplifier section schematic diagram.

Fig. 4 is adjustable frequency driving circuit principle figure in Fig. 1.

Fig. 5 is ballast output circuit schematic diagram in Fig. 1.

Fig. 6 is protective circuit schematic diagram in Fig. 1.

Embodiment

Embodiment 1, in Fig. 1, the present embodiment is a kind of 600W of having, the electric ballast of 400W and tri-power gears of 250W, the circuit block diagram of this embodiment is as shown in Figure 1: EMC circuit and PFC booster circuit produce 400VDC voltage, drive HID lamp (high-pressure sodium lamp) by the ballast output circuit, the ballast output circuit as shown in Figure 5, the driving process is to adopt the 400VDC voltage transformation is become to exchange output driving HID lamp, drive circuit utilizes the primary coil T3A of isolating transformer T3 to add square-wave signal, the field effect transistor Q2 and the Q3 that control the second subprime coil T3B of isolating transformer and be connected in grade coil T3C for the third time by square-wave signal, by complementary LO, the RO(square-wave signal) signal is delivered to Q2, the drive end G utmost point of Q3.The signal passed over, because the impact of Transformer Winding phase place, two metal-oxide-semiconductor Q2, Q3 alternate conduction, will be cut into high frequency square wave by the 400V direct current signal of PFC output.Transformer T4, T5 are actual is the inductance of two series connection, as adjustable induction reactance.The adjustment of power is that light tube electric voltage, the electric current by changing bulb realized.In this section, can regard T4, T5 inductance and bulb string as and ally the communists with the voltage of a 400V square wave of carrying.Change the induction reactance of T4, T5, can change light tube electric voltage, the electric current of the bulb of connecting with it.The induction reactance that different frequencies is corresponding different, this changes the driving signal of T4, T5 induction reactance just for LO, RO signal.Can change the induction reactance of T4, T5, finally reach the purpose that changes power output.

Here, used complementary LO, RO(square-wave signal) the signal transmission to output power controlled, and in use, according to the power gear of HID lamp (high-pressure sodium lamp), regulate in advance the power gear be complementary with bulb in power conditioning circuitry.As shown in Figure 2, power conditioning circuitry is exactly the circuit of the voltage signal of an output setting, utilize the route in J1 that the resistance connected mode in circuit is changed, utilize the dividing potential drop effect of resistance R 7, R10, R64 and 65, divide to be pressed in Pref with reference to voltage VREF and export.

The voltage signal of Pref output, after overcurrent signal detection, error amplifying circuit amplify, but output in the high-frequency drive circuit, produces complementary LO, RO(square-wave signal) signal.

The amplifier that 1,2,3 pin of the IC4 of the voltage signal of Pref output in overcurrent signal detection, error amplifying circuit form, do the error amplification by amplifying signal and power signal Pref, provides the signal that can regulate Vfreq.The Vfreq signal is input to the 6th pin of the IC5 in the adjustable frequency drive circuit, drives the complementary PWM driving of the two-way chip as the IC5 of adjustable frequency drive circuit master chip, complementary LO, the RO(square-wave signal of output on the 14th and the 11st pin of IC5) signal.

In the present embodiment, as shown in Figure 3, this circuit has adopted a chip IC 4 for input, error amplifying circuit, and its model is LM2902, and it is comprised of four amplifiers.1, the operational amplifier that 2,3 pin form is exactly for amplifying by the output control signal Pref of power conditioning circuitry and the difference value of 2 pin signals, the size of the signal after amplification for regulating the Vfreq signal.In addition, also have three operational amplifiers to be used for respectively doing ratio and amplify and comparator, the signal detected is detected, after amplification, judged by protective circuit.

In input, error amplifying circuit, the amplifier be comprised of 8,9,10 pin of chip IC 4 realizes the current signal enlarging function.5, the amplifier that 6,7 pin form realizes comparator function, by the current signal (8 pin) amplified, with 6 pin protecting group calibration signal relatively, realize that defencive function judges.1, the amplifier that 2,3 pin form, do the error amplification by amplifying signal and power signal Pref, provides the signal that can regulate Vfreq, for regulating power.12, the amplifier that 13,14 pin form provides high level during ballast protection, makes ballast can realize restarting function.

As shown in Figure 4, it drives chip to form by the complementary PWM of a two-way to the adjustable frequency drive circuit, and the model of this chip IC 5 is that SG3525 is that the complementary PWM of a two-way drives chip.Regulate 6 pin voltage signals and can regulate LO, the RO two-way drives the frequency of signal.10 pin are the guard signal pin, close LO, RO signal while receiving high level.Therefore, add the Vfreq signal of being controlled by input, error amplifying circuit in 6 pin of IC5, control LO, the RO two-way drives the frequency of signal.

In addition, as shown in Figure 6, in circuit, U1 is 555 timing circuits to protective circuit.When output abnormality; current signal detects the Isen seen in Fig. 3 and does the signal amplification through 8,9,10 pin of IC4; the signal amplified arrives 5 pin and 6 pin protection voltage reference compares, and makes 7 pin output low levels, can make the signal A1 signal of protective circuit transfer low level to by high level.6 pin of U1 are changed to low level like this.3 pin of U1 are exported high level OFF signals simultaneously.The OFF signal reaches 10 pin of the IC5 of Frequency Adjustable drive circuit, closes the driving signal, realizes the function of protection ballast.

In the present embodiment, the triode Q4 in current signal detection, error amplifying circuit is the effect of playing an acceleration protection function.As shown in Figure 3, when output abnormality, the OFF signal is high level, makes the triode conducting, and the Vfreq signal will be pulled to very low voltage.After Vfreq is dragged down, IC5 will go out a very high-frequency driving signal of output, by LO, RO, the induction reactance of T4, T5 be increased, and fast power output will be reduced to minimum value, accelerate the protection action of ballast.

In this part, one of error amplifying circuit function has 3: the R81,93,97 that current signal detect is detected, 11 resistance as shown in Figure 6, on current signal Isen amplify, be convenient to rear class and use.The current signal amplified and protecting group calibration signal relatively, judge whether output, whether in abnormality, enter guard mode.The signal amplified and power reference Pref do error and amplify, judge whether power output reaches the numerical value set, if do not have, error signal is amplified, the 6 pin signal Vfreq that adjust IC5 adjust and drive LO, RO frequency, and then regulation output power, until power output is corresponding with the power reference of setting.Enter guard period at ballast, the comparator that 12,13,14 pin form will be exported a high level, and this signal can change the level of U1 the 6th pin, makes ballast be achieved the autoboot function.

Claims

1. the electric ballast of power gear more than a kind, comprise electromagnetic compatibility circuit, circuit of power factor correction and ballast output circuit, it is characterized in that: also comprise the adjustable frequency drive circuit; The square-wave signal that described adjustable frequency drive circuit produces adjustable frequency outputs to described ballast output circuit.

2. the electric ballast of many power gears according to claim 1 is characterized in that: described adjustable frequency drive circuit comprises that the complementary PWM of a two-way drives chip; The complementary PWM of described two-way drives the 6th pin of chip to connect the described square-wave signal output frequency that control signal is controlled the 11st pin and the output of the 14th pin.

3. the electric ballast of many power gears according to claim 1, it is characterized in that: described ballast output circuit comprises isolating transformer, field effect transistor Q2, field effect transistor Q3, inductance T4, inductance T5; In described isolating transformer primary coil two termination adjustable frequency drive circuits, the complementary PWM of two-way drives the 11st pin and the output of the 14th pin of chip; The grid of the described field effect transistor Q2 of out-phase termination of the second subprime coil of described isolating transformer, the source class of field effect transistor Q2 connects the 400V direct current, and the drain electrode of field effect transistor Q2 is connected with the HID lamp by described inductance T4, inductance T5; The grid of the described field effect transistor Q3 of homophase termination of the coil of level for the third time of described isolating transformer, the source electrode of field effect transistor Q3 connects the grid of field effect transistor Q2, and the drain electrode of field effect transistor Q3 connects testing circuit.

4. according to the electric ballast of arbitrary described many power gears in claims 1 to 3, it is characterized in that: also comprise that power conditioning circuitry and current signal detect, error amplifying circuit; Described power conditioning circuitry output voltage signal through described current signal detect, error amplifying circuit is linked into described adjustable frequency drive circuit after amplifying.

5. according to the electric ballast of arbitrary described many power gears in claims 1 to 3, it is characterized in that: also comprise protective circuit, described protective circuit generation control signal is controlled described adjustable frequency drive circuit and is stopped exporting square-wave signal.