JP3409338B2 - Power supply device, discharge lamp lighting device and lighting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for replacing a rectified and smoothed voltage obtained by full-wave rectifying an AC voltage with a high frequency voltage,
The present invention relates to a discharge lamp lighting device for lighting a discharge lamp using this power supply device and a lighting fixture using this discharge lamp lighting device.

[0002]

2. Description of the Related Art Generally, a lighting device is required to light a discharge lamp.

FIG. 8 is a circuit diagram showing an example of a conventional discharge lamp lighting device using a high frequency voltage. In this discharge lamp lighting device, an AC voltage (for example, frequency; 50 Hz, voltage; 100 V) applied from a commercial power supply 101 is full-wave rectified by a rectifier circuit 103 via a high frequency noise reduction circuit 102, and then by a smoothing capacitor 104. It is smoothed and supplied to the inverter circuit 105.

The inverter circuit 105 converts the input voltage into a high frequency voltage to generate a high frequency voltage on the primary winding 106a side of the output transformer 106, and the secondary winding 106b.
To generate a high-frequency voltage boosted to the side of the discharge lamp 107
Lights up.

[0005]

By the way, in the discharge lamp lighting device using the above-described conventional smoothing capacitor, the smoothing capacitor 10 with respect to the AC voltage waveform of the commercial power source 101 is used.
The waveform of the DC voltage smoothed by 4 is as shown in FIG. In FIG. 9, FIG. 9A shows the smoothing capacitor 10.
4 shows the waveform of the DC voltage smoothed, and FIG. 9C shows the waveform of the AC voltage of the commercial power supply 101.

As shown in this figure, the smoothed portion (hatched portion) is the portion where the electric charge stored in the smoothing capacitor 104 is discharged, and the smoothing capacitor 104 is charged during the period (t1, The current waveform of t2, t3) is
For example, as shown in FIG.

As is clear from FIGS. 9 (b) and 9 (c), the current waveform in the period in which the smoothing capacitor 104 is charged is shorter in duration than the commercial voltage waveform of the commercial power source 101, and the power factor is small. There was a problem that was worse.

[0008] The present invention is made in order to solve the problem described above, the load device power supply capable of improving the low distortion of the power factor of the input current to the (inverter circuit), a discharge lamp lighting device and an illumination It is intended to provide equipment.

[0009]

In order to solve the above-mentioned problems, the present invention according to claim 1 has a rectifying circuit for full-wave rectifying the output voltage from an AC power source, and a switching element, An inverter that converts an output voltage into a high-frequency voltage, and is provided between the input terminals of the inverter, and the instantaneous value of the output voltage of the rectifier circuit is charged at the output of the rectifier circuit during a period of a predetermined value or more, and An auxiliary DC power supply that supplies power to the inverter instead of the rectifier circuit during a period when the instantaneous value of the output voltage of the rectifier circuit is lower than a predetermined value,
A second inductor is magnetically coupled to the second inductor, which is inserted in a power feeding path from the auxiliary DC power supply to the inverter, and is inserted in a charging circuit from the rectification circuit to the auxiliary DC power supply. A first inductor and the second inductor
In parallel with the inductor and the auxiliary DC power supply
A capacitor provided between input terminals of the inverter, and a voltage generated in the second inductor in response to ON / OFF of a switching element of the inverter during a period in which power is supplied from the auxiliary DC power supply to the inverter. It is characterized in that the high frequency voltage is superposed on the rectified pulsating current voltage induced by the first inductor.

Further, in the present invention according to claim 2, a rectifier circuit for full-wave rectifying the output voltage from the AC power source, an inverter having a switching element for converting the output voltage of the rectifier circuit into a high frequency voltage, and Provided between the input terminals of the inverter, the instantaneous value of the output voltage of the rectifier circuit is charged by the output of the rectifier circuit during a period of a predetermined value or more,
An auxiliary DC power supply that supplies power to the inverter in place of the rectification circuit during a period when the instantaneous value of the output voltage of the rectifier circuit is lower than a predetermined value, and a auxiliary DC power supply inserted from the auxiliary DC power supply to the inverter. Second inductor, a first inductor magnetically coupled to the second inductor and inserted in a charging circuit from the rectifier circuit to the auxiliary DC power supply, the second inductor and the auxiliary DC power supply Average
Inverters connected in series between the input terminals of the inverter.
And capacitor, and a discharge lamp which is turned on by input of a high frequency voltage obtained by the inverter, in a period for supplying power from the auxiliary DC power source to the inverter, the second in response to turning on and off of the switching element of the inverter The voltage generated in the inductor is induced in the first inductor, and the high frequency voltage is superimposed on the rectified pulsating current voltage.

According to the present invention as defined in claim 3, there is provided a discharge lamp, a discharge lamp lighting device according to claim 2 for lighting the discharge lamp, and a lighting fixture main body to which the discharge lamp and the discharge lamp lighting device are attached. It is characterized by having.

[0012]

According to the present invention as set forth in claims 1, 2 and 3, with respect to the pulsating current voltage supplied to the load device (inverter circuit),
When the value of the voltage charged in the capacitor is increased, the input voltage waveform of the high frequency voltage superposition induced in the first inductor in the waveform of the pulsating voltage by the discharge electric capacitors load device (inverter circuit ) Is supplied to.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a circuit configuration diagram showing a discharge lamp lighting device provided with a power supply device according to the present invention. As shown in this figure, this discharge lamp lighting device includes, for example, a commercial power source (eg, frequency: 50 Hz, voltage: 100 V) 1 as an AC power source,
The high-frequency noise reduction circuit 2, the rectifier circuit 3, and the capacitor 4 at both ends of the rectifier circuit 3 reduce the high-frequency noise component of the commercial voltage supplied from the commercial power source 1 to perform full-wave rectification of the commercial voltage.

A backflow prevention diode 5, a first and second magnetically connected first and second inductors 6 and 7, a capacitor 8 and a backflow prevention diode 9 are connected to both ends of the capacitor 4. A capacitor 10 is connected in parallel to both ends of the second inductor 7 and the diode 9.

At both ends of the capacitor 10, the capacitor 1
1 and the coil 12, a resonance circuit, a switching transistor 13, and a switching transistor 13
An inverter circuit (in this embodiment, a one-stone inverter) 15 including a control circuit 14 for performing ON / OFF control of is connected between the capacitor 8 and the diode 9 and the capacitor 11.
A diode 16 for preventing backflow is connected between the resonance circuit formed by the coil 12 and the switching transistor 13 and the switching transistor 13.

A choke coil 17, a capacitor 18, and a discharge lamp 19 are connected to a resonance circuit composed of the capacitor 11 and the coil 12 of the inverter circuit 15. The discharge lamp lighting device according to the present embodiment is configured as described above, and the pulsating current voltage that is full-wave rectified by the rectifier circuit 3 is
It is input to the inverter circuit 15 via the diode 5 and the first inductor 6, and when the switching transistor 13 is turned on by the high speed (eg, 50 KHz) ON / OFF control by the control circuit 14, one end of the capacitor 4 → the diode 5 → the first The first and second inductors 6 and 7 → capacitor 8 → diode 16 → switching transistor 13 → the other end of the capacitor 4 flow through the path to charge the capacitor 8. This charge is output from the rectifier circuit 3.
The instantaneous value of the input voltage is less than a predetermined value (charging voltage of the capacitor 8)
It will take place during the above period.

Then, the instantaneous value of the output voltage of the rectifier circuit 3 is
The period is lower than the specified value (charging voltage of the capacitor 8)
Instead of the flow circuit 3, the capacitor 8 supplies power to the inverter 15.
To do. That is, during this period , a voltage is generated in the second inductor 7 by discharging the electric charge charged in the capacitor 8.

[0019] Then, the voltage generated in the second inductor 7, is induced in the first inductor 6, Ru by superimposing a high-frequency voltage to the pulsating voltage after rectification. As a result, the input current can be made into a sine wave by eliminating the pause section of the input current.

In the inverter circuit 15, a high frequency AC voltage is generated in the resonance circuit formed by the capacitor 11 and the coil 12 by the input of the input voltage shown in FIG. The input current input to the circuit has a small decrease in power factor.

The discharge lamp 19 is lit by the high frequency AC voltage generated in the inverter circuit 15 which is input via the choke coil 17 and the capacitor 18.

As a modified example of this embodiment, as shown in FIG. 3, a tap is provided between the magnetically connected first and second inductors 6 and 7 to connect the capacitor 8 and the diode 9. It may be configured to be connected.

4 to 6 are circuit configuration diagrams showing a discharge lamp lighting device according to another embodiment of the present invention.

In the discharge lamp lighting device shown in FIG. 4, the capacitor 4 of the above-mentioned embodiment is connected between the high frequency noise reduction circuit 2 and the rectification circuit 7, and the diode 5 for preventing backflow is omitted. The configuration and operation are the same as those in the above embodiment.

In the discharge lamp lighting device shown in FIGS. 5 and 6, a half-bridge inverter and a parallel bush-pull inverter are used in the inverter circuit 15, respectively. Other configurations and operations are the same as those shown in FIG. It is similar to the electric lamp lighting device.

The load device may be other than the above-mentioned inverter circuit and discharge lamp.

FIG. 7 is a schematic sectional view showing an illuminating device using the above-mentioned discharge lamp lighting device.

As shown in this figure, in this lighting device, the discharge lamp lighting device 40 having the structure shown in FIG. 1 is housed in the lighting fixture body 30, and two discharge lamps are provided on the surface of the lighting fixture body 30. 19 is attached.

This lighting device is also the discharge lamp lighting device 4 described above.
Since 0 is provided, it is possible to suppress a decrease in the power factor of the input current.

[0030]

As described above in detail with reference to the embodiments, according to the present invention described in claims 1, 2 and 3, the power factor can be improved and the input current with low distortion can be obtained with a simple structure. be able to.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a discharge lamp lighting device using a power supply device according to an embodiment of the present invention.

FIG. 2 is a waveform diagram showing a waveform of an input voltage to the inverter circuit in the present embodiment.

FIG. 3 is a circuit configuration diagram showing a main part of a discharge lamp lighting device according to a modified example of the present embodiment.

FIG. 4 is a circuit configuration diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 5 is a circuit configuration diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 6 is a circuit configuration diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 7 is a schematic sectional view showing an illumination device using the discharge lamp lighting device according to the present invention.

FIG. 8 is a circuit configuration diagram showing an example of a conventional discharge lamp lighting device.

FIG. 9 is a waveform diagram illustrating the power factor of the input voltage to the inverter circuit by the conventional discharge lamp lighting device.

[Explanation of symbols]

1 Commercial power supply 2 High frequency noise reduction circuit 3 rectifier circuit 4,8,10,11,18 capacitors 5,9,16 diode 6 First inductor 7 Second inductor 12 coils 13 switching transistors 14 Control circuit 15 Inverter circuit 19 discharge lamp

Claims (3)

(57) [Claims] 1. A rectifier circuit for full-wave rectifying an output voltage from an AC power source, an inverter having a switching element for converting an output voltage of the rectifier circuit into a high-frequency voltage, and provided between input terminals of the inverter, The rectifier circuit is charged by the output of the rectifier circuit while the instantaneous value of the output voltage of the rectifier circuit is equal to or more than a predetermined value, and the rectifier circuit is replaced while the instantaneous value of the output voltage of the rectifier circuit is lower than the predetermined value. An auxiliary DC power supply for supplying power to the inverter, a second inductor inserted in a power supply path from the auxiliary DC power supply to the inverter, and a magnetic field coupled to the second inductor, 1st inserted in the charging circuit to the auxiliary DC power supply
And the second inductor and the auxiliary DC power supply in parallel with each other.
However, a condenser provided between the input terminals of the inverter
And a voltage generated in the second inductor in response to ON / OFF of a switching element of the inverter is induced in the first inductor during a period in which power is supplied from the auxiliary DC power supply to the inverter, and rectification is performed. A power supply device characterized in that a high-frequency voltage is superimposed on a subsequent pulsating voltage. 2. A rectifier circuit for full-wave rectifying an output voltage from an AC power source, an inverter having a switching element for converting the output voltage of the rectifier circuit into a high frequency voltage, and provided between input terminals of the inverter, The rectifier circuit is charged by the output of the rectifier circuit while the instantaneous value of the output voltage of the rectifier circuit is equal to or more than a predetermined value, and the rectifier circuit is replaced while the instantaneous value of the output voltage of the rectifier circuit is lower than the predetermined value. An auxiliary DC power supply for supplying power to the inverter, a second inductor inserted in a power supply path from the auxiliary DC power supply to the inverter, and a magnetic field coupled to the second inductor, 1st inserted in the charging circuit to the auxiliary DC power supply
And the second inductor and the auxiliary DC power supply in parallel with each other.
However, a condenser provided between the input terminals of the inverter
And a discharge lamp that is turned on by the input of the high-frequency voltage obtained by the inverter, and the second lamp is turned on / off in response to turning on / off of a switching element of the inverter during a period in which power is supplied from the auxiliary DC power source to the inverter. The voltage generated in the inductor is induced in the first inductor to superimpose a high frequency voltage on the rectified pulsating current voltage. 3. A lighting fixture comprising: a discharge lamp; a discharge lamp lighting device according to claim 2 for lighting the discharge lamp; and a lighting fixture main body to which the discharge lamp and the discharge lamp lighting device are attached. .