JP3514603B2 - High power factor high intensity discharge lamp lighting device and driving method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high power factor high intensity discharge lamp lighting device provided with a high power factor AC / DC converter for converting a commercial AC input power source voltage into a stable DC output voltage, and a driving method thereof. It is a thing.

[0002]

2. Description of the Related Art Regarding a high power factor AC / DC converter, the present applicant has already proposed Japanese Patent Application No. 3-280454 (Japanese Patent Application Laid-Open No. 5-95681). Although this circuit has a simple structure, it achieves both high power factor and economy. However, the condition of the circuit constant makes it difficult to deal with the input voltage in a wide variation range, which is practically impossible.

[0003]

The present invention provides a lighting device for a high-intensity discharge lamp with a high power factor that can handle a wide range of input voltage in a high power factor AC / DC converter, and a driving method thereof. This is an issue.

[0004]

Means for Solving the Problems Claim 1 of the present invention comprises:
In order to solve the above problems, a pair of input terminals to be connected to a commercial AC power supply; a full-wave rectifier circuit including a pair of AC input terminals and a pair of DC output terminals connected to the input terminals; An inductor and a diode connected in series to the DC output terminal of the full-wave rectifier circuit; at least a primary winding and a secondary winding, and one terminal of the primary winding connected in series to the diode A switching element comprising: a transformer; a coupling capacitor connected between a connection point of the inductor and the diode and the other terminal of the primary winding; and a pair of main electrodes and a control terminal. ,
A switching element having one end of its main electrode connected between the coupling capacitor and the other terminal of the primary winding;
A control circuit for generating an on / off drive signal having a frequency sufficiently higher than the frequency of the commercial AC power source to drive the switching element; and a diode and one terminal of the primary winding of the transformer. A smoothing circuit connected to a connection point, and two capacitors having substantially the same capacitance, which are connected in series across a charging diode; and energy connected to each of these two capacitors in parallel. Power factor AC comprising a smoothing circuit including an energy emitting diode for releasing the current; a rectifying means connected to the secondary winding of the transformer; and a capacitor for smoothing the output of the rectifying means. / DC converter, a voltage detector for detecting the high power factor AC / DC converter DC output voltage, the DC output current, respectively, and the current detecting means, before
Note The current connected in series with the main current terminal of the switching element.
A high power factor high brightness discharge lamp lighting device comprising a flow detector, an inverter circuit connected to the output terminal of the high power factor AC / DC converter, and an igniter connected to the output terminal of the inverter circuit, The control circuit, prior to lighting of the lamp lit by this device, controls the high power factor AC
/ DC converter function of frequency control the high power factor AC / DC converter I by the detection signal of the voltage detecting means for detecting a DC output voltage of, immediately after lighting of the lamp,
I by the detection signal of the current detecting means for detecting a DC output current of the high power factor AC / DC converter, said high power factor AC
A function of suppressing the DC output current by controlling the pulse width of the / DC converter, and a period during which the lamp is constantly lit,
According to the detection signal from the current detector, the switch
We propose a high power factor high-intensity discharge lamp lighting device, characterized in that a control and the ability to constant power control so that the peak value becomes a constant current flowing through the main current terminals of the ring element.

In order to solve the above-mentioned problems, a second aspect of the present invention is to detect the voltage of the smoothing circuit according to the first aspect, and change the switching frequency of the switching element according to the variation of the detected voltage. A high-intensity discharge lamp lighting device is proposed.

According to a third aspect of the present invention, in order to solve the problems, a pair of input terminals to be connected to a commercial AC power source; a pair of AC input terminals connected to the input terminals and a pair of DC outputs. A full-wave rectification circuit including a terminal; an inductor and a diode connected in series to a DC output terminal of the full-wave rectification circuit; at least a primary winding and a secondary winding; A transformer having one terminal connected in series with the diode; a coupling capacitor connected between a connection point between the inductor and the diode and the other terminal of the primary winding; a pair of main electrodes; A switching element having a control terminal, one end of a main electrode of which is connected between the coupling capacitor and the other terminal of the primary winding; do it A control circuit for generating an ON / OFF drive signal having a sufficiently high frequency to drive the switching element; and a smoothing circuit connected to a connection point between the diode and one terminal of the primary winding of the transformer. And two capacitors of approximately equal capacitance connected in series with the charging diode in between; and an energy emitting diode connected in parallel to each of these two capacitors for emitting energy. A smoothing circuit consisting of;
A high power factor AC / DC converter comprising rectifying means connected to the secondary winding of the transformer; a capacitor for smoothing the output of the rectifying means; and a DC output of the high power factor AC / DC converter. Voltage detection means for detecting voltage and DC output current, current detection means, and the switching element
A high current detector including a current detector connected in series to the main current terminal of the child, an inverter circuit connected to the output terminal of the high power factor AC / DC converter, and an igniter connected to the output terminal of the inverter circuit. In a method for driving a power factor high-intensity discharge lamp lighting device, the high power factor AC / DC converter is frequency-controlled before lighting of a lamp to be lit by this device, and the high power factor is controlled immediately after lighting of the lamp. Rate AC
/ DC converter pulse width control, when the lamp is always on, by the detection signal from the current detector,
The peak of the current flowing through the main current terminal of the switching element.
Click value proposes a driving method of the high power factor high-intensity discharge lamp lighting apparatus, characterized by constant power control so as to be constant.

[0007]

EXAMPLE FIG. 1 shows a high power factor AC / according to the present invention.
A high power factor and high brightness discharge lamp lighting device provided with a DC converter will be described. This high power factor high brightness discharge lamp lighting device,
It is roughly divided into a high power factor AC / DC converter 2, an inverter circuit 35 which receives a direct current output thereof and converts it into a rectangular wave of about 100 Hz, an igniter 37, a high-intensity discharge lamp 39, a current detector 45 and the like.

First, the high power factor AC / DC converter 2 will be described in detail. As shown in FIG. 1, the commercial AC power supply 1 is connected to a bridge-type rectifier circuit 7 via input terminals 3 and 5, as shown in FIG. The DC output terminal of the rectifier circuit 7 is supplied to the smoothing circuit 14 via the inductor 9 and the diode 11. The drain electrode of the FET 27 is connected to the connection point between the inductor 9 and the diode 11 via the capacitor 13, and one of the primary windings of the transformer 25 is connected, and the source electrode of the FET 27 is connected to the smoothing circuit 14. Connected to the negative side. The gate electrode of the FET 27 is driven on / off by the control circuit 29 at a high frequency of, for example, about 100 kHz. These parts are commutation chopper circuits. That is, the AC voltage (100V to 200V 50Hz) from the input commercial AC power source 1 is rectified by the rectifier circuit 7 and supplied to the drain electrode of the FET 27 via the inductor 9 and the capacitor 13.

First, when the FET 27 is on, a current for charging the capacitor 13 flows from the inductor 9. This current flows for a period until the voltage of the capacitor 13 reaches the voltage on the plus side of the smoothing circuit 14, and energy is accumulated in the inductor 9 and the capacitor 13. Next, when the FET 27 is turned off, the current energy stored in the inductor 9 charges the smoothing circuit 14 through the diode 11. Since the electrostatic capacitance in the smoothing circuit 14 has a sufficiently large value, it maintains a substantially constant DC voltage Eb in the steady state. Since the input alternating current always passes through the inductor 9, the current is continuous.

Next, the positive side of the smoothing circuit 14 is connected to the drain of the FET 27 via the primary winding n1 of the transformer 25. The secondary winding n2 of the transformer 25 is connected to the rectifying diode 31 and the smoothing capacitor 33 and also to the DC output terminal. A voltage detector 43 is connected to the smoothing capacitor 33, and its detection output is connected to the detection input terminal of the control circuit 29. The control circuit 29 is a circuit configured by adding a widely used integrated circuit for switching power supply and some auxiliary components.

As for the transformer 25, the above-mentioned D
In addition to the function as a component of the C-DC converter section 24, there is a reset function of the capacitor 13 due to the natural vibration of the capacitor 13 and the primary winding n1 of the transformer 25. F
When the ET 27 is on, the accumulated charge of the capacitor in the smoothing circuit 14 supplies power to the output terminal through the primary winding n1 of the transformer 25 and the circuits thereafter, and FET2
When 7 is off, the energy of the current flowing in the primary winding n1 of the transformer 25 flows in the path of the capacitor 13 and the diode 11 to invert the voltage of the capacitor 13.

Next, the operation will be described in detail. It is assumed that the switching frequency of the FET 27 is sufficiently higher than the frequency of the commercial AC power supply 1. Therefore, the input voltage is considered to be constant during one cycle of switching, and the inductance L1 of the inductor 9 is sufficiently large with respect to the switching frequency, so that it can be regarded as a substantially constant current. Further, the exciting inductor L0 of the primary winding of the transformer 25 is considerably smaller than the inductance L1 of the inductor 9 and has a turns ratio of 1: 1. Further, the capacitance of the capacitor 33 is sufficiently large and will be described as a voltage source. . Hereinafter, description will be given separately for time sections T0, T1, ..., T5 shown in FIG.

[Section T0-T1] When the FET 27 is turned on at time T0, the commercial AC power supply 1 → inductor 9 until then.
→ Diode 11 → Smoothing circuit 14 → Current flowing in the closed loop of the commercial AC power supply 1 flows through the FET 27 while charging the capacitor 13. At the same time, the voltage Eb of the smoothing circuit 14 is applied to the primary winding n1 of the transformer 25, but the voltage of the secondary winding n2 has a negative polarity with respect to the output voltage E0, and the diode 31 No current flows to the secondary side because it is cut off by. Therefore, the exciting current in the primary winding n1 of the transformer 25 is time T0, and the smoothing circuit 14 → primary winding n1 → FE
T27 → The smoothing circuit 14 starts to flow in the closed loop, as shown in FIG.
As shown in (a), it rises with the inclination of Eb / L0 (L0: exciting inductance of the transformer 25).

[Section T1-T2] Capacitor 1 at time T1
When the voltage of 3 becomes the voltage Eb of the smoothing circuit 14, it is clamped to that voltage, and the current of the inductor 9 flows into the smoothing circuit 14 via the diode 11. Therefore, FET2
The current flowing through 7 temporarily drops due to the current flowing through the smoothing circuit 14, but continues to rise with a gradient of Eb / L0. Figure 2
The waveforms are shown in (b) and (c). This operation mode is FET27
Continues until turns off. Since the conduction period of the FET 27 is almost constant unless the effective value of the load and the input voltage is changed, this period is longer when the phase of the input voltage is higher, and is about 0 to 3.0 μs.

[Section T2-T3] When the FET 27 is turned off at time T2, the exciting current flowing in the primary winding n1 of the transformer 25 is the primary winding n1 → capacitor 13 → diode 1
It flows in the closed loop of the 1 → primary winding n1. The voltage of the FET 27 increases from zero according to the voltage of the capacitor 13. On the other hand, the current of the secondary winding n2 of the transformer 25 is FET
Capacitor 1 of primary winding n1 of transformer 25 even after 27 is turned off
Since the voltage of 3 is applied, it still does not flow. Then, the current of the inductor 9, which is the input current, continues to flow to the smoothing circuit 14 while continuously decreasing.

[Section T3-T4] Capacitor 1 at time T3
When the voltage of 3 becomes -Vo, the voltage of the primary winding n1 of the transformer 25 also becomes -Vo and the current starts to flow in the secondary winding n2. Then, the secondary winding voltage is clamped to the output voltage Eo, and the primary winding is also fixed to the voltage Eo. When the primary winding voltage becomes constant Eo, the capacitor 13 is no longer charged, therefore
The primary current In1 of the transformer 25 is the time as shown in Fig. 2 (a).
It becomes zero at T3, and the stored energy commutates to the secondary winding n2. The secondary winding current In2 decreases with the slope of Eo / Lo as shown in Fig. 2 (e). The voltage of the FET 27 is the sum of the voltage of the capacitor 13, the voltage of the primary winding n1 of the transformer 25 and the output voltage Eo. At time T4, the current in the secondary winding n2 becomes zero, and all the energy stored in the exciting inductance of the transformer 25 is released. The current of the inductor 9 continues to flow to the smoothing circuit 14. The time from time T3 to T4 is determined by the value of the output current Io, and is about 4 μs at the maximum output current.

[Section T4-T5] This section is a period from when the secondary current becomes zero to when the FET 27 is next turned on. At time T5, the FET 27 is turned on again, and the process from time T0 is repeated. The waveform of the current Ii flowing through the inductor 9 is shown in Fig. 2 (g).

When a simulation is performed for one cycle of the AC frequency, the commercial AC input current Ii has a waveform in which a DC component is superimposed on a sine wave, and the power factor thereof is a value extremely close to 1.

[Operation of Smoothing Circuit] Next, the operation of the smoothing circuit 14 will be described with reference to the waveform diagram shown in FIG.
In this operation description, the inductor 9 and the diode 1
Consider 1 as a short circuit. Further, it is assumed that the current to the DC-DC converter unit 24 supplies a constant current in a range that does not reduce the smoothing effect.

As shown in FIG. 3, a full-wave rectified voltage is applied to the output terminal of the rectifier circuit 7 which is formed by connecting diodes in bridge connection.
(e1) appears. This full-wave rectified voltage (e1) is applied to the DC-DC converter unit 24 and also applied to the capacitors 15 and 17 connected in series to charge them. in this case,
Since the capacitors 15 and 17 are in series and their capacitances are almost equal, the rectified voltage obtained by dividing the full-wave rectified voltage (e1).
(e2) is applied to each of the capacitors 15 and 17 half by half. Here, the full-wave rectified voltage (e1) and the rectified voltage (e
2) is a virtual voltage that makes the circuit independent, and is therefore shown in parentheses or shown by a broken line in FIG.

Next, each of the capacitors 15 and 17 is connected to the commercial alternating current from the time t2 when the capacitor voltage e3 becomes lower than the rectified voltage (e2) to the peak time t3 when the full-wave rectified voltage (e1) rises. The power supply 1 charges the full-wave rectifier circuit 7 through the diode 21, and at time t3, the capacitor voltage
e3 rises to the peak voltage of the rectified voltage (e2). Since the rectified voltage (e2) drops from the peak time t3, each capacitor 1
Charge current stops flowing to 5 and 17, each capacitor voltage
e3 keeps that value. After time t4, the capacitor voltage
Since e3 becomes higher than the full-wave rectified voltage (e1), the diodes 19 and 23 that were in the off state are turned on, and the capacitors 15 and 17 are connected to the DC-D from time t4 to time t1.
Energy is supplied to the C converter unit 24. During this energy supply, the rectifier circuit 7 becomes non-conductive, and no current flows from the commercial AC power source 1 to the DC-DC converter unit 24 via the rectifier circuit 7. At time t1, the capacitor voltage e3 becomes lower than the full-wave rectified voltage (e1), so that the diodes 19 and 23 are turned off and the capacitors 15 and 1
7 is no longer discharged, and then the capacitor voltage e3 maintains the value at that time, and the full-wave rectifier circuit 7 becomes conductive. Times of Day
At t2, the capacitor voltage e3 becomes lower than the rectified voltage (e2),
Charging of the capacitors 15 and 17 is started. After that, the same operation is repeated. Therefore, the output voltage of the entire smoothing circuit 14, that is, the input voltage to the DC-DC converter unit 24 becomes a smoothed DC voltage as shown by the waveform e4, and the output voltage e4 does not drop to 0V. , DC-DC converter part 24 can be operated stably.

Further, the input current of the rectifier circuit 7 has a waveform (i
Since the current as shown in 1) and the input current to the circuit of the capacitors 15 and 17 connected in series becomes the current as shown by the waveform i2, the current input from the commercial AC power supply 1 to the entire circuit has the waveform i3. As shown in the figure, compared with a smoothing circuit using a simple capacitor, the rest period is shorter and the peak value is lower, resulting in a very good power factor.

In the operation of the smoothing circuit 14, the element that determines the timing at which the diodes 19 and 23 are turned on is automatically determined and operated according to the voltage relationship of the commercial AC power supply 1. Therefore, commercial AC power supply 1
Even if the voltage fluctuates and changes in a wide range of 100 V / 200 V, for example, each voltage and current value are almost proportional to each other, and the characteristic is that they operate without any trouble.

Due to the respective actions of the high power factor AC / DC converter 2 and the smoothing circuit 14 described above, the power factor is improved and the commercial AC power source 1 operates well even in a wide variation range. . In order to be compatible with both 100V / 200V, the electrostatic capacity of the coupling capacitor 13 is made small and the charging energy at the time of 200V input is selected small. On the other hand, when 100 V is input, energy becomes insufficient, but this shortage can be compensated for by designing the constant of the inductor 9.

Next, the high-intensity discharge lamp lighting device will be described. In FIG. 1, a DC output generated at the output terminals 30 and 32 of the high power factor AC / DC converter 2 is received and converted into a rectangular wave of about 100 Hz by an inverter circuit 35, and a high-intensity discharge lamp 39 is passed through an igniter 37. Is supplied with the necessary power. The electric power required for the high-intensity discharge lamp 39 is such that first, a sufficiently high voltage is applied at the time of lighting, and secondly, the holding current necessary for maintaining the lighting state is maintained for a certain short time immediately after lighting. Thirdly, it is necessary to supply a predetermined substantially constant electric power during the period of steady lighting.

FIG. 4 illustrates the relationship between voltage and current of this high-intensity discharge lamp. Before lighting, it is a region α of almost zero current and a relatively high voltage, and immediately after lighting it is a region β of a relatively large current. During steady lighting, it is represented by a region γ on the hyperbola showing constant power. .

In order to realize the control of these three types of regions, as shown in FIG. 1, in the region α before lighting, the voltage detector 43 is connected to the capacitor 33, that is, the output terminals 30, 32 of the AC / DC converter 2. Connected to the control circuit 29, and sends the detection signal to the control circuit 29. The control circuit 29 controls the frequency of the operation of the DC-DC converter section 24 to suppress the output voltage, and also controls the peak current (the method is in the following areas. γ will be described). In the region β immediately after lighting, the detection signal from the current detector 45 that is connected in series to the output terminal 32 of the AC / DC converter 2 and detects the DC output current is sent to the control circuit 29, and the control circuit 29 The operation of the DC-DC converter unit 24 is pulse width modulated to suppress its output current. Further, in the region γ that is steadily turned on, the control circuit 29 controls the peak value of the drain current of the FET 27 to be a constant value by the detection signal from the current detector 41 that detects the drain current flowing through the FET 27. By this, DC-D
The operation of the C converter unit 24 is constant power control.

FIG. 5 illustrates the voltage and current of each part with respect to lighting of the high-intensity discharge lamp 39 over time. In the region α before lighting, the discharge lamp current (m) is almost zero, and the discharge lamp voltage (k) shows a high voltage. When the igniter 37 is activated to generate a pulse voltage of several kilovolts, it is ignited and the discharge lamp current (m) starts to flow. In the region β immediately after this ignition, the value of the discharge lamp current (m) is slightly large, and the value of the discharge lamp voltage (k) is slightly small. In addition, the current (j) of the inductor 9 at this time becomes a train of high-frequency rectangular waves whose contour is similar to the commercial AC voltage (h). After a lapse of a short time, the power (n) supplied to the discharge lamp increases and becomes the region γ during steady lighting.
At this time, the waveform of each part continues to be constant. The waveform shown in FIG. 5 is a conceptual waveform for explanation, and the vertical and horizontal axes do not show actual values.

FIG. 6 and FIG. 7 respectively show an embodiment of a high power factor and high brightness discharge lamp lighting device according to the present invention.
The waveform of each part at the time of 200V input and the waveform of each part at the time of 100V input are shown by the waveform obtained by simulation. In these figures, e14 is a smoothed output voltage of the smoothing circuit 14, which is a waveform in which a switching waveform is superimposed on the DC voltage. IQ is a switching element F
It is a current waveform of ET27 and VQ is its voltage waveform. Ii is a waveform corresponding to the input current from the commercial AC power supply 1. Then, e1 which is the input voltage waveform of the commercial AC power supply 1 is compared, and the waveform of the input current Ii is a waveform whose contour line is substantially proportional to e1. Further, the input current Ii
The waveform of is compared with the input of AC100V and the input of AC200V, and similarly, the contour line becomes a waveform substantially proportional to e1. The waveform of the input current Ii is averaged into a continuous sine wave by inserting an effective filter for a high frequency of switching.

FIG. 8 shows an example of a high power factor and high intensity discharge lamp lighting device according to the present invention, when 200 V is input and when 1 V is input.
The measured waveform of the AC input current at the time of inputting 00V is shown. As the actual measurement conditions, it is shown that a filter effective for the high frequency of the above-mentioned switching is inserted in the input circuit, and each of them has a substantially continuous sine wave shape and a high power factor.

FIG. 9 shows a high power factor AC / D according to the present invention.
Another embodiment of the C converter and the high power factor high brightness discharge lamp lighting device will be described. This embodiment is different from the embodiment shown in FIG. 1 in that the voltage detector 18 is connected in parallel to the lower capacitor of the smoothing circuit 14.
FET27 is added by the signal of this voltage detector 18
The output power is corrected by controlling the frequency. In this embodiment, the connection position of the voltage detector 18 can be the same at other connection positions as long as a detection signal proportional to the average value of the voltage value of the commercial AC power supply 1 can be obtained. is there.

When the current detector 41 controls the peak current of the FET 27 to be constant, the transformer 25
The energy transfer to the secondary side of is constant regardless of the fluctuation of the commercial AC power supply 1. However, in reality, due to the delay of the control system and the response delay of the switching element, AC100V / 2
An error occurs in energy transmission when there is a large voltage fluctuation such as when switching to 00V.

In order to correct this error, the voltage of the lower capacitor of the smoothing circuit 14 is detected by the voltage detector 18, and the amount of voltage change is realized by changing the switching frequency of the switching element. As an example, when the switching frequency is 100 KHz at AC 100 V, AC 200
Energy transfer to the secondary side at 65 KHz at V coincided.

In this embodiment, the connection position of the voltage detector 18 has the same function at other connection positions as long as a detection signal proportional to the average value of the voltage of the commercial AC power supply 1 can be obtained. Is.

[0035]

EFFECTS OF THE INVENTION Since the present invention has the features described above, it has a simple structure and is small and lightweight, and has a high power factor,
It has a high efficiency effect. Especially 100V / 20
It is extremely economical due to the shared use of 0V.

[Brief description of drawings]

FIG. 1 shows an embodiment of a high power factor and high brightness discharge lamp lighting device according to the present invention.

FIG. 2 is a waveform diagram for explaining the operation of the converter circuit.

FIG. 3 is a waveform diagram for explaining the operation of the smoothing circuit.

FIG. 4 is a characteristic diagram of a high power factor high intensity discharge lamp lighting device according to the present invention.

FIG. 5 shows the voltage and current of each part over time in the high power factor and high brightness discharge lamp lighting device according to the present invention.

FIG. 6 shows waveforms of various parts when 200 V is input in an embodiment of the high power factor and high brightness discharge lamp lighting device according to the present invention.

FIG. 7 shows waveforms of various parts when 100 V is input in an embodiment of the high power factor and high brightness discharge lamp lighting device according to the present invention.

FIG. 8 shows waveforms of AC input currents at 200V input and 100V input in an embodiment of the high power factor and high brightness discharge lamp lighting device according to the present invention.

FIG. 9 shows another embodiment of the high power factor and high brightness discharge lamp lighting device according to the present invention.

[Explanation of symbols]

1 ... Commercial AC power supply 24 ... DC-DC converter 3,
5 ... Input terminal 7 ... Rectifier circuit 9 ... Inductor 11 ... Diode 14 ... Smoothing circuit 15, 17 ... Capacitor 18 ... Voltage detector 19, 2
1, 23 ... Diode 24 ... DC-DC converter section 25 ... Transformer 2
7 ... FET 29 ... Control circuit 31 ... Diode 33 ... Capacitor 35 ... Inverter circuit 37 ... Igniter 39
... High-intensity discharge lamp 41 ... Current detector 43 ... Voltage detector 45 ... Current detector

Continuation of the front page (56) Reference JP-A-5-236749 (JP, A) JP-A-8-205520 (JP, A) JP-A-8-223923 (JP, A) JP-A-8-103079 (JP , A) JP 4-21360 (JP, A) JP 5-260754 (JP, A) JP 5-95681 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H02M 3/00-3/44

Claims (3)

(57) [Claims] 1. A full-wave rectification circuit comprising a pair of input terminals to be connected to a commercial AC power supply; a pair of AC input terminals connected to the input terminals and a pair of DC output terminals; An inductor and a diode connected in series to the DC output terminal of the circuit; a transformer comprising at least a primary winding and a secondary winding, one terminal of the primary winding being connected in series with the diode A coupling capacitor connected between a connection point between the inductor and the diode and the other terminal of the primary winding; and a switching element having a pair of main electrodes and a control terminal, A switching element having one end of an electrode connected between the coupling capacitor and the other terminal of the primary winding; generating an on / off drive signal having a frequency sufficiently higher than the frequency of the commercial AC power supply; Previous A control circuit for driving a switching element; a smoothing circuit connected to a connection point between the diode and one terminal of the primary winding of the transformer, the smoothing circuit being connected in series with a charging diode interposed therebetween. Smoothing circuit consisting of two capacitors of equal capacitance; an energy emitting diode connected in parallel to each of these two capacitors for emitting energy; secondary winding of said transformer A high power factor AC / DC converter consisting of rectifying means connected to the line; and a capacitor for smoothing the output of the rectifying means, and a DC output voltage and a DC output current of the high power factor AC / DC converter, respectively. A voltage detecting means for detecting, a current detecting means, and a main current terminal of the switching element are connected in series.
A high power factor high intensity discharge lamp lighting device comprising a current detector, an inverter circuit connected to the output terminal of the high power factor AC / DC converter, and an igniter connected to the output terminal of the inverter circuit, wherein the control circuit, the lamp in the prior lighting of being turned on by the device, the high power factor AC / DC I by the detection signal of the voltage detecting means for detecting a DC output voltage of the high power factor AC / DC converter a function of frequency controls converter, immediately after lighting of the lamp, I'm on the detection signal of the current detecting means for detecting a DC output current of the high power factor AC / DC converter, said high power factor AC / DC converter And a function of suppressing the DC output current by controlling the pulse width, and during the constant lighting period of the lamp , from the current detector
According to the detection signal of, the main current end of the switching element
A high power factor high brightness discharge lamp lighting device, which has a function of performing constant power control by controlling a peak value of a current flowing through a child to be constant. 2. The high power factor high intensity discharge lamp lighting device according to claim 1, wherein the voltage of the smoothing circuit is detected, and the switching frequency of the switching element is changed according to the amount of change in the detected voltage. 3. A full-wave rectification circuit comprising a pair of input terminals to be connected to a commercial AC power supply; a pair of AC input terminals connected to the input terminals and a pair of DC output terminals; An inductor and a diode connected in series to the DC output terminal of the circuit; a transformer comprising at least a primary winding and a secondary winding, one terminal of the primary winding being connected in series with the diode A coupling capacitor connected between a connection point between the inductor and the diode and the other terminal of the primary winding; and a switching element having a pair of main electrodes and a control terminal, A switching element having one end of an electrode connected between the coupling capacitor and the other terminal of the primary winding; generating an on / off drive signal having a frequency sufficiently higher than the frequency of the commercial AC power supply; Previous A control circuit for driving a switching element; a smoothing circuit connected to a connection point between the diode and one terminal of the primary winding of the transformer, the smoothing circuit being connected in series with a charging diode interposed therebetween. Smoothing circuit consisting of two capacitors of equal capacitance; an energy emitting diode connected in parallel to each of these two capacitors for emitting energy; secondary winding of said transformer A high power factor AC / DC converter consisting of rectifying means connected to the line; and a capacitor for smoothing the output of the rectifying means, and a DC output voltage and a DC output current of the high power factor AC / DC converter, respectively. A voltage detecting means for detecting, a current detecting means, and a main current terminal of the switching element are connected in series.
Driving a high power factor high intensity discharge lamp lighting device comprising a current detector, an inverter circuit connected to the output terminal of the high power factor AC / DC converter, and an igniter connected to the output terminal of the inverter circuit In the method, the high power factor AC / DC converter is frequency-controlled before the lamp is turned on by this device, and the high power factor AC / DC converter is pulse-width controlled immediately after the lamp is turned on. When the lamp is always on, the current detector detects
Depending on the output signal, the main current terminal of the switching element
A method for driving a high power factor and high brightness discharge lamp lighting device, comprising performing constant power control so that a peak value of a flowing current is constant .