TWI389599B - Single - stage high - intensity gas discharge lamp electronic lighting drive circuit - Google Patents

Description

Single-stage high-intensity gas discharge lamp electronic lighting drive circuit

The invention relates to a high-intensity gas discharge lamp electronic illumination driving circuit, in particular to a single-stage high-intensity gas discharge lamp electronic illumination driving circuit.

Referring to FIG. 1 , it is a block diagram of a commercially available three-stage low frequency square wave driven high power electronic stabilizer, which has an active power factor correction circuit 11 (first stage) and a power control circuit 12 ( The second stage), and a full bridge DC/AC converter 13 (third stage), the active power factor correction circuit 11 uses a boost type DC/DC converter (Boost Converter) to increase the input voltage to supply The high voltage required for the DC link capacitor, and operating in the boundary conduction mode, enables the input current to automatically track the waveform of the input voltage to achieve high power efficiency; the power control circuit 12 uses a step-down DC/DC converter ( Buck Converter), and adjust the power of the lamp by controlling the voltage supplied to the latter stage; the full-bridge DC/AC converter 13 (Full-Bridge Inverter) converts the DC power into an AC low-frequency square wave to drive the high Intensity gas discharge lamp tube 100 (HID Lamp). Since the three-stage architecture consumes higher component costs, it does not meet the principle of circuit cost savings, and the overall efficiency of the circuit is low.

Referring to FIG. 2, it is a block diagram of a two-stage low frequency square wave driven high power electronic stabilizer, which has a flyback DC/DC converter (Flyback Converter) 14, and a full bridge DC/AC. The converter 15, the reciprocating DC/DC converter 14 is operated at a high frequency and has a power factor correction function. To provide a stable and chopped small voltage source to the subsequent stage circuit; the full bridge DC/AC converter 15 operates at a low frequency and converts the DC power source into an AC low frequency square wave to drive the high intensity gas discharge lamp 100. Although the two-stage electronic ballast reduces some electronic components than the three-stage architecture, in the two-stage circuit architecture, the power still needs to be converted by two-stage circuits, and the overall efficiency cannot be improved.

Accordingly, it is an object of the present invention to provide a high intensity gas discharge lamp electronic lighting drive circuit having high power efficiency, high efficiency, and reduced circuit cost.

Therefore, the single-stage high-intensity gas discharge lamp electronic lighting driving circuit of the present invention is electrically connected to an alternating current power source to drive a high-intensity gas discharge lamp, and the single-stage high-intensity gas discharge lamp electronic lighting driving circuit comprises: A power rectifier unit, an interleaved boost full bridge converter, and a power control unit.

The power rectifying unit is electrically connected to the alternating current power source and rectifies the alternating current power source into a direct current power source.

The interleaved boosting full-bridge converter has two first capacitors electrically connected to the power rectifying unit, two diodes respectively electrically connected to the first capacitors, and two respectively electrically connected to the diodes a first inductor connected, two first power switches respectively electrically connected to the first inductors and operating at a high frequency, and at least two first electrically connected to the first power switches and operating at a low frequency a power switch for correcting the DC power supply current input by the power rectifying unit to a sinusoidal waveform and having a high power factor And outputting a stable voltage source to provide a low frequency square wave power supply to the high intensity gas discharge lamp.

The constant power control unit is electrically connected to the interleaved boost full-bridge converter, and receives the voltage and current signals of the high-intensity discharge lamp, and generates a control according to the voltage and current signals of the high-intensity discharge lamp. Wait for the square wave control signal of the first power switch.

The effect of the invention is that the interleaved boosting full-bridge converter makes the current input to the high-intensity gas discharge lamp follow the input voltage, thereby obtaining high power factor and low input current total harmonic distortion, and providing stability. The square wave power supply is applied to the high-intensity gas discharge lamp, and the high-intensity gas discharge lamp can be stably operated at rated power by the constant power control unit, and the total circuit component quantity of the present invention is compared with the conventional three-stage There are fewer two-stage ballast circuits and have the advantage of low circuit cost.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals.

As shown in FIG. 3, a first preferred embodiment of the electronic lighting driving circuit for a single-stage high-intensity discharge lamp of the present invention is electrically connected to an AC power supply Vac to drive a high-intensity discharge lamp 200, including a power supply. The rectifying unit 2, an interleaved boost full-bridge converter 3, and a certain power control unit 5.

The power rectifying unit 2 is electrically connected to the AC power supply Vac, and The AC power supply Vac is rectified into a DC power supply. In this embodiment, the AC power supply Vac is a 110V AC power supply supplied by a general commercial power supply, and the power supply rectification unit 2 is formed by electrically connecting four diodes to each other. Full-Bridge Rectifier, but equivalent circuit structure can also be used, and should not be limited to the specific circuit structure disclosed in this embodiment.

The interleaved boost full-bridge converter 3 has two first capacitors C1 and C2 electrically connected to the power rectifying unit 2, and two diodes D1 and D2 electrically connected to the first capacitors C1 and C2, respectively. Two first inductors L1, L2 electrically connected to the diodes D1, D2, and two first electrically connected to the first inductors L1, L2 and operating at a high frequency (40 kHz) A power switch S _H1 , S _H2 cooperates to correct the DC power supply current input by the power rectifying unit 2 into a sinusoidal waveform and has a high power factor, and outputs a stable voltage source. It can be known from the literature that the boost converter operates in the discontinuous mode that the distortion of the input current and the power factor correction are related to the ratio of the input peak voltage to the output DC voltage, and the closer the input voltage is to the output DC link voltage. Time (when the ratio of the two is closer to one hour), the more serious the input current distortion factor and the worse the ability to correct the power, the interleaving technique used in this embodiment uses the first capacitors C1, C2 to input The voltage source is divided into two equal voltage sources (each is one and a half of the input voltage source), and the two inductors D1, D2 and the first inductors L1, L2 respectively form two boost converter units. In this way, the ratio of the input voltage source to the output DC link voltage is much smaller than one, so that the input current distortion factor is small and the power factor correction capability is good.

In this embodiment, the first inductors L1 and L2 are separately The core of the core (the physical structure of the iron core is not shown in the figure, only represented by the equivalent circuit), of course, the first inductors L1, L2 can also be in the form of a common iron core, that is, each The coils of one of the inductors L1 and L2 are wound on the same core, thereby saving the number and volume of the circuit components, depending on the design considerations in actual implementation, and are not limited herein.

In addition, the interleaved boost full-bridge converter 3 is electrically connected to the high-intensity discharge lamp 200, and has two electrical connections respectively connected to the first power switches S _H1 , S _H2 and operates at a low frequency (400 Hz). a second power switch S _L1 , S _L2 , a second capacitor C3 connected in parallel with the high-intensity discharge lamp 200, a second inductor L3 electrically connected to the second capacitor C3, and a respectively The third capacitor C4 is electrically connected to the second power switch S _L1 , S _L2 .

The second capacitor C3 and the second inductor L3 cooperatively form a low pass filter for filtering high frequency chopping generated by the first inductors L1 and L2, and the second power switch S _L1 and S _L2 are coupled to the first power switches S _H1 , S _{H2 of} the interleaved boost converter unit 3 to provide a stable low frequency square wave power to the high intensity gas discharge lamp 200. It should be noted that the high-intensity discharge lamp 200 is generally used in conjunction with a single lamp circuit 300, and the circuit structure and operating principle of the lighting circuit 300 should be well known to those of ordinary skill in the art. Therefore, the detailed circuit structure and working principle are not described here.

It should be noted that, in this embodiment, the first power switches S _H1 , S _H2 and the second power switches S _L1 , S _L2 are implemented by using a MOSFET, but may also be an electronic switch such as a BJT or an IGBT. Instead of the design considerations in actual implementation, it should not be limited to the description disclosed in this embodiment.

The constant power control unit 5 has two amplifiers 51 for respectively connecting the voltage and current signals of the high-intensity discharge lamp 200, a voltage and current signal electrically connected to the amplifier 51 and the amplified high-intensity discharge lamp 200. An adder 52 (Adder), an error amplifier 53 electrically connected to the adder 52 and generating a DC voltage signal, and an electrical connection with the error amplifier 53 and converting the DC voltage signal into The comparator 54 (comparator) of the square wave control signal.

Referring to FIG. 3 and referring to FIG. 4 to FIG. 11 , the embodiment has eight modes in operation, and the following describes each mode: in the first mode ( FIG. 4 ), the second power switch S _L1 and the first power The switch S _H2 is in an off state, and the first power switch S _H1 and the second power switch S _{L2 are} in an on state. At this time, the first capacitor C1 acts as a voltage source for the first inductor L1 via the path: the first inductor L1 and the diode D1. The energy stored in the first inductor L2 in the previous cycle will be released according to the following two paths. Path one: a first capacitor C2, a body diode of the high frequency power switch S _H1 , a third capacitor C4, a diode D2, and a first inductor L2. Path two: a first capacitor C2, a second inductor L3, a high-intensity discharge lamp 200, a second power switch S _L2 , a diode D2, and a first inductor L2.

When the embodiment is operating in the second mode (FIG. 5), the second power switch S _L1 is in an off state, and the first power switch S _H1 , the first power switch S _H2 and the second power switch S _{L2 are} in an on state. The first capacitor C1 continues to store energy for the first inductor L1 according to the path of the first mode. The current of the high-intensity discharge lamp 200 is determined by the path: the third inductor L3, the high-intensity discharge lamp 200, the second power switch S _L2 , and the body diode of the first power switch S _H2 (Body-diode) A continuous flow action.

When the embodiment is operating in the third mode (FIG. 6), the second power switch S _L1 and the first power switch S _H1 are in an off state, and the first power switch S _H2 and the second power switch S _{L2 are} in an on state. . At this time, the capacitor C2 acts as a voltage source through the path: the first power switch S _H2 , the diode D2 , and the first inductor L2 to store energy for the first inductor L2 . The energy stored in the first inductor L1 in the previous cycle will be released according to the following two paths. Path one: a first inductor L1, a diode D1, a third capacitor C4, a body diode of the first power switch S _H2 , and a first capacitor C1. Path 2: a second inductor L3, a high-intensity discharge lamp 200, a second power switch S _L2 , and a body diode of the first power switch S _H2 .

When the embodiment is operating in the fourth mode (FIG. 7), the second power switch S _L1 and the first power switch S _H1 are in an off state, and the first power switch S _H2 and the second power switch S _{L2 are} in an on state. At this time, the first capacitor C2 continues to store energy for the first inductor L2 according to the path of the third mode. The current of the high-intensity discharge lamp 200 is dependent on the path: the second inductor L3, the high-intensity discharge lamp 200, the second power switch S _L2 , and the body diode of the first power switch S _H2 for a freewheeling action .

When the embodiment is operating in the fifth mode (FIG. 8), the second power switch S _L2 and the first power switch S _H2 are in an off state, and the first power switch S _H1 and the second power switch S _{L1 are} in an on state. . At this time, the first capacitor C1 acts as a voltage source through the path: the first inductor L1, the diode D1, and the first power switch S _H1 to perform energy storage on the first inductor L1. The energy stored in the first inductor L2 in the previous cycle will be released according to the following two paths. Path one: a first capacitor C2, a body diode of the first power switch S _H1 , a third capacitor C4 , a diode D2 , and a first inductor L2 . Path 2: a second inductor L3, a body diode of the first power switch S _H1 , a second power switch S _L1 , and a high-intensity discharge lamp 200 .

When the embodiment is operating in the sixth mode (FIG. 9), the second power switch S _L2 and the first power switch S _H2 are in an off state, and the first power switch S _H1 and the second power switch S _{L1 are} in an on state. . At this time, the first capacitor C1 continues to store the first inductor L1 according to the path of the fifth mode. The current of the high-intensity discharge lamp 200 depends on the path: the second inductor L3, the body diode of the first power switch S _H1 , the second power switch S _L1 , and the high-intensity discharge lamp 200 perform a freewheeling action .

When the embodiment is operating in the seventh mode (FIG. 10), the second power switch S _L2 and the first power switch S _H1 are in an off state, and the first power switch S _H2 and the second power switch S _{L1 are} in an on state. At this time, the first capacitor C2 acts as a voltage source for the first inductor L2 via the path: the first power switch S _H2 , the diode D2 , and the first inductor L2 . The energy stored in the first inductor L1 in the previous cycle will be released according to the following two paths. Path one: a first inductor L1, a diode D1, a third capacitor C4, a body diode of the first power switch S _H2 , and a first capacitor C1. Path two: a first inductor L1, a diode D1, a second power switch S _L1 , a high-intensity discharge lamp 200, a second inductor L3, and a first capacitor C1.

When the embodiment is operating in the eighth mode (FIG. 11), the second power switch S _L2 is in an off state, and the first power switch S _H2 , the first power switch S _H1 and the second power switch S _{L1 are} in an on state. At this time, the first capacitor C2 continues to store energy for the first inductor L2 according to the path of the seventh mode. The current of the high-intensity discharge lamp 200 depends on the path: the second inductor L3, the body diode of the first power switch S _H2 , the second power switch S _L1 , and the high-intensity discharge lamp 200 perform a freewheeling action. .

Therefore, the present embodiment utilizes the above eight actuation modes to achieve the function of the interlaced operation, and by means of the low frequency alternate operation, the low frequency square wave can be output to drive the high intensity gas discharge lamp 200 to avoid the audio resonance phenomenon. Occurs when the arc discharge is unstable and the arc output is flickering.

Referring back to FIG. 3, the control principle of the constant power control of the present embodiment is to feedback the voltage signal and current signal of the high-intensity discharge lamp 200 (the current signal is taken out from point A in FIG. 3, and the voltage signal is taken out from point B). And amplifying the voltage and current signals by the amplifiers 51 respectively, and then adding the amplified signals through the adder 52 circuit, and the output voltage of the adder 52 is slightly changed near a reference voltage Vref, and And the reference voltage Vref is input into the error amplifier 53 and converted into a DC voltage signal, and the DC voltage signal is further compared with a reference sawtooth voltage input to the comparator 54 to generate the first power switch. The square wave control signals of S _H1 and S _H2 , the control square wave signal will be adjusted and changed according to different feedback lamp voltage and lamp current, so that the lamp can be stably operated at rated power to achieve constant power control. The effect of the present embodiment can also be applied to high-intensity gas discharge lamps 200 of different brands and wattages. Of course, the comparator 54 is generally combined with a gate drive circuit 55 to process the square wave control signal to meet the gate drive electrical specifications of the first power switches S _H1 , S _H2 , and the like. The circuit structure of the gate driving circuit 55 is well-known in the industry. Those skilled in the art should be able to implement the gate driving circuit 55 shown in FIG. 3, which is not Narration.

The effect of the constant power control unit 5 is that when the high-intensity discharge lamp 200 begins to age, its impedance changes, and the constant power control unit 5 detects the voltage of the high-intensity discharge lamp 200. And the current is adjusted to match the impedance change of the high-intensity discharge lamp 200 to adjust the driving energy of the high-intensity discharge lamp 200 so that the operating power is maintained at the rated value.

It is to be noted that FIGS. 12 and 13 are results obtained by simulating the voltage (V _lamp ) and the current (I _lamp ) of the high-intensity discharge lamp 200 of the first preferred embodiment by using the IsSpice software. 12, 13 and it can be clearly seen in Fig. 14 that the waveforms of the two are quite close, and the input current (indicated by a broken line in Fig. 14) follows the input voltage (shown by a solid line in Fig. 14) and is a sine wave waveform ( See Figure 14), thus demonstrating that this embodiment does have the advantage of high power factor and low input current total harmonic distortion.

In addition, the interleaved boosting full-bridge converter 3 of the present embodiment has the characteristics of reducing the number of circuit components, and can improve the situation of the conventional two-stage and three-stage architecture ballast circuit components, thereby effectively reducing the circuit cost. .

As shown in FIG. 15, the second preferred embodiment of the electronic lighting driving circuit for a single-stage high-intensity gas discharge lamp of the present invention is substantially the same as the first preferred embodiment, and the same is no longer a rumor, wherein The same is that the interleaved boost full-bridge converter 3 has four second power switches S _L1 S S _L4 , two second capacitors C3 , and two second inductors L3 , thereby driving two at the same time A high intensity gas discharge lamp 200 is provided.

In summary, the single-stage high-intensity gas discharge lamp electronic illumination driving circuit of the present invention uses the interleaved operation mode of the interleaved boosted full-bridge converter 3 to input the low-frequency square wave current of the high-intensity discharge lamp 200. It is to follow the input voltage, and to obtain high efficiency, high power factor, and low input current total harmonic distortion, and the number of overall circuit components is less than the conventional two-level and three-level architecture, and has the advantage of low circuit cost. The high-intensity discharge lamp 200 can be stably operated at rated power by the constant power control unit 5, thereby making the high-intensity discharge lamp 200 driven by the present invention more stable in operation and suitable for different brands. The high-intensity gas discharge lamp 200 of the same wattage can indeed achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2‧‧‧Power rectifier unit

3‧‧‧Interleaved Boost Full Bridge Converter

5‧‧‧Constant power control unit

51‧‧‧Amplifier

52‧‧‧Adder

53‧‧‧Error amplifier

54‧‧‧ comparator

55‧‧‧ gate drive circuit

C1, C2‧‧‧ first capacitor

C3‧‧‧second capacitor

C4‧‧‧ third capacitor

L1, L2‧‧‧ first inductor

L3‧‧‧second inductor

D1, D2‧‧‧ diode

S _H1~H2 ‧‧‧First power switch

S _L1~L4 ‧‧‧second power switch

Vac‧‧‧AC power supply

200‧‧‧High-intensity discharge lamp

300‧‧‧Lighting circuit

1 is a system block diagram showing the circuit architecture of a conventional three-stage electronic ballast; FIG. 2 is a system block diagram showing the circuit structure of a conventional two-stage electronic ballast; FIG. 3 is a circuit diagram. A first preferred embodiment of a single-stage high-intensity gas discharge lamp electronic lighting driving circuit of the present invention and a high-intensity gas discharge FIG. 4 is a schematic diagram of an actuation mode illustrating a first mode of operation of the first preferred embodiment; FIG. 5 is a schematic diagram of an actuation mode illustrating the first comparison The second mode of operation of the preferred embodiment; FIG. 6 is a schematic diagram of an actuation mode illustrating a third mode of operation of the first preferred embodiment; FIG. 7 is a schematic diagram of an actuation mode illustrating the first preferred embodiment The fourth mode of operation; FIG. 8 is a schematic diagram of an actuation mode illustrating a fifth mode of operation of the first preferred embodiment; FIG. 9 is a schematic diagram of an actuation mode illustrating a sixth mode of operation of the first preferred embodiment; 10 is a schematic diagram of an actuation mode illustrating a seventh actuation mode of the first preferred embodiment; FIG. 11 is a schematic diagram of an actuation mode illustrating an eighth actuation mode of the first preferred embodiment; FIG. 12 is a waveform diagram The simulation of the voltage of the high-intensity gas discharge lamp of the first preferred embodiment using the IsSpice software; FIG. 13 is a waveform diagram illustrating the simulation of the high-intensity gas of the first preferred embodiment by using the IsSpice software. FIG. 14 is a waveform diagram illustrating the simulation of the AC input voltage and current of the first preferred embodiment using the IsSpice software; and FIG. 15 is a circuit diagram illustrating the single-stage high-intensity gas discharge of the present invention. A second preferred embodiment of the lamp electronic lighting driving circuit and a two-high-intensity gas discharge lamp, a two-point lamp circuit, and an arrangement of an alternating current power source (the fixed power control unit is omitted).

2‧‧‧Power rectifier unit

3‧‧‧Interleaved Boost Full Bridge Converter

5‧‧‧Constant power control unit

51‧‧‧Amplifier

52‧‧‧Adder

53‧‧‧Error amplifier

54‧‧‧ comparator

55‧‧‧ gate drive circuit

C1, C2‧‧‧ first capacitor

C3‧‧‧second capacitor

C4‧‧‧ third capacitor

L1, L2‧‧‧ first inductor

L3‧‧‧second inductor

D1, D2‧‧‧ diode

S _H1~H2 ‧‧‧First power switch

S _L1~L2 ‧‧‧second power switch

Vac‧‧‧AC power supply

200‧‧‧High-intensity discharge lamp

300‧‧‧Lighting circuit

Claims (7)

A single-stage high-intensity gas discharge lamp electronic lighting driving circuit is electrically connected with an alternating current power source to drive a high-intensity gas discharge lamp, and the single-stage high-intensity gas discharge lamp electronic lighting driving circuit comprises: a power rectifying unit Electrically connecting with the AC power source and rectifying the AC power source into a DC power source; an interleaved boosting full-bridge converter having two first capacitors electrically connected to the power rectifying unit, and two respectively a capacitor electrically connected to the diode, two first inductors respectively electrically connected to the diodes, two first power switches respectively electrically connected to the first inductors and operating at a high frequency, and And at least two second power switches respectively electrically connected to the first power switches and operating at a low frequency to cooperatively correct the DC power supply current input by the power rectifying unit into a sinusoidal waveform and having a high power factor, and output a stable voltage source, thereby providing a low frequency square wave power supply to the high intensity gas discharge lamp; and a power control unit, and the interleaved boost full bridge converter Connection, and receives the high-intensity discharge lamp the voltage and current signal, then the voltage and current of the discharge lamp for generating a control signal such square wave control signal of the first power switch according to the high intensity. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 1, wherein the interleaved boosting full-bridge converter further has at least one second capacitor connected in parallel with the high-intensity gas discharge lamp. And at least one second inductor electrically connected to the second capacitor, the second capacitor and the second inductor cooperatively filtering the first inductor The high frequency ripple generated by the device. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 2, wherein the interleaved boosting full-bridge converter further has a third electrically connected to the second power switches respectively. Capacitor. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 1 or 3, wherein the constant power control unit has two amplifiers respectively for voltage and current signals of the high-intensity gas discharge lamp, An adder electrically coupled to the amplifiers and summing the voltage and current signals of the amplified high-intensity discharge lamp, an error amplifier electrically coupled to the adder and generating a DC voltage signal, and an error The amplifier is electrically connected and converts the DC voltage signal into a comparator of the square wave control signal. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 4, wherein the comparator of the constant power control unit compares with an output voltage of the error amplifier by using a reference sawtooth voltage To generate a square wave control signal that controls the first power switches. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 5, wherein the two first inductors of the interleaved boosting full-bridge converter respectively have independent iron cores. The single-stage high-intensity gas discharge lamp electronic lighting driving circuit according to claim 5, wherein the two first inductors of the interleaved boosting full-bridge converter are in a common iron core shape.