JPH09238466A - Power supply equipment, discharge lamp lighting equipment, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a current flowing in a choke coil of a step-up chopper circuit in turning on a power supply, and discharge residual charge in an output capacitor when an AC power supply is turned off. SOLUTION: A resistor R31 for discharge is connected in parallel with an output capacitor C31 of a step-up chopper circuit 30. A switch SW44 of a relay 44 serves as a switch for discharge on/off, and is connected with a path through which a discharge current flows from the output capacitor C31 to the resistor R31 for discharge. When an AC power supply is opened, the switch SW44 is closed, and makes a discharge current flow in the resistor R31 for discharge. After a switch SW22 of a relay 22 is closed, a step-up control power supply circuit 40 supplies a power supply voltage V1 for step-up control to the step-up chopper circuit 30.

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, a discharge lamp lighting device, and a lighting device, which convert an AC voltage from an AC power supply into a DC voltage and boost the voltage by a boost chopper circuit to supply the load.

[0002]

2. Description of the Related Art Conventionally, a power supply device that converts an AC voltage from an AC power supply into a DC voltage, boosts the DC voltage by a boost chopper circuit, and supplies the load to a load has been put into practical use.

In such a power supply device, when the power is turned on,
What suppresses the rush current from the AC power supply to the output capacitor is described in JP-A-5-257548.

FIG. 4 is a circuit diagram showing an example of a conventional power supply device for suppressing such an inrush current.

In FIG. 4, one output terminal of the AC power supply 51 is connected to one input terminal of the inrush current suppressing circuit 60 via the power switch SW51, and the other output terminal of the other inrush current suppressing circuit 60. Connected to the input terminal.
One and the other output terminals of the inrush current suppressing circuit 60 are connected to one and the other input terminals of the rectifying circuit 52, respectively.

One and the other output terminals of the rectifier circuit 52 are connected to one and the other input terminals of the boost chopper circuit 70.

The step-up chopper circuit 70 is a step-up chopper in the discontinuous mode, boosts the input DC voltage, and outputs it as a voltage V72 from the output terminal pair of the positive polarity output terminal 72 and the negative polarity output terminal 73.

More specifically, the inrush current suppressing circuit 60 includes a rectifying circuit 61, a smoothing capacitor C61, a capacitor C62, a resistor R61, and an inrush current reducing resistor R6.
2, switch SW62 of relay 62 and coil L62
It is composed of

One input terminal of the inrush current suppressing circuit 60 is connected to one input terminal of the rectifying circuit 61 and one terminal of the switch SW62 of the relay 62. The other terminal of the switch SW62 of the relay 62 is connected to one output terminal of the inrush current suppression circuit 60. The other input terminal of the inrush current suppressing circuit 60 is connected to the other input terminal of the rectifying circuit 61 and is also connected to the other output terminal of the inrush current suppressing circuit 60.

One output terminal of the rectifier circuit 61 is connected to the other output terminal of the rectifier circuit 61 via a smoothing capacitor C61, and a resistor R61 and a capacitor C62 are also connected.
It is connected to the other output terminal of the rectifier circuit 61 via a series connection with. The coil L62 of the relay 62 is connected in parallel with the capacitor C62.

An inrush current reducing resistor R62 is connected in parallel to the switch SW62 of the relay 62.

The step-up chopper circuit 70 has its positive input terminal connected to the positive output terminal 72 via the choke coil L71 and the anode / cathode path of the diode D71. The cathode of the diode D71 is connected to the negative output terminal 73 via the output capacitor C71. Further, in the boost chopper circuit 70, the negative input terminal is connected to the negative output terminal 73. Between the positive output terminal 72 and the negative output terminal 73, a load 5 such as a discharge lamp lighting device is provided.
3 are connected.

Choke coil L71 and diode D71
The connection point is connected to the negative input terminal of the boost chopper circuit 70 via the collector-emitter path of the NPN transistor Tr71 which is a switching element.

The positive input terminal of the step-up chopper circuit 70 is connected to the negative input terminal of the step-up chopper circuit 70 through the series connection of the resistors R71 and R72. Resistance R
The connection point of 71 and R72 is connected to the negative input terminal of the boost chopper circuit 70 via the capacitor C72, and is also connected to the cathode of the Zener diode Dz71. The anode of the Zener diode Dz71 is connected to the negative input terminal of the boost chopper circuit 70. The voltage V71 at the connection point of the resistors R71 and R72 is supplied to the switching control circuit 71.

The switching control circuit 71 has a voltage V71.
Is supplied as a power supply voltage, and the NPN is supplied by this power supply voltage.
The switching control signal a11 is supplied to the base of the transistor Tr71.

In such a power supply device, a description will be given of the time when the AC power supply is open (power switch SW51 is off). In this case, since the AC power supply voltage is not supplied to the rectifier circuits 52 and 61 and the DC voltage is not generated, no current flows through the coil L62 of the relay 62 of the inrush current suppressing circuit 60, and the switch SW62 of the relay 62 is turned off. Stay in the state. Further, since the step-up chopper circuit 70 is not supplied with the DC voltage, the choke coil L71 and the diode D7 are provided.
1, the current does not flow in the NPN transistor Tr71, and the supplied voltage V71 is 0 in the switching control circuit 71.
Since it becomes V, the switching control signal a11 becomes a non-signal state, and the NPN transistor Tr71 maintains the off state. In this state, the voltage V12 between the positive output terminal 72 and the negative output terminal 73 becomes 0V, and the load 5
No power supply voltage is supplied to 3.

Next, when the AC power is turned on (power switch SW
The state in which 51 is switched from the off state to the on state) will be described. In this case, immediately after the power switch SW51 is switched to the ON state, the switch SW of the relay 62 is
62 is turned off, and the AC power supply voltage from the AC power supply 51 flows only through the inrush current reduction resistor R62, so that the inrush current from the AC power supply 51 to the output capacitor C71 is suppressed. At about the same time, the voltage V71 rises, the switching control circuit 71 operates, and the NPN transistor Tr71 starts switching. Therefore, the voltage V7 between the positive polarity output terminal 72 and the negative polarity output terminal 73.
2 also stands up. After that, in the rectifier circuit 61, the AC power supply voltage generates a DC voltage, but the coil L62 is not excited for the time determined by the resistor R61 and the capacitor C62, and the switch SW62 of the relay 62 maintains the off state. After that, the coil L62 is excited and the switch SW of the relay 62 is excited.
62 is turned on, and the AC power supply voltage from the AC power supply 51 is directly applied to the rectifier circuit 52.

When the NPN transistor Tr71 is turned on while the AC power supply voltage from the AC power supply 51 is directly applied to the rectifier circuit 52, the NPN transistor T is turned on.
The current IT71 flowing through r71 is the choke coil L71.
It becomes the same as the current IL71 flowing through. In this case, since a counter electromotive force is generated in the choke coil L71, the current IL71 flowing from the choke coil L71 rises with a predetermined inclination. After that, the NPN transistor Tr71 is turned off and the current IT71 becomes zero. Current IT71 is 0
Switching to the primary winding L71 of the choke coil L71.
, A counter electromotive force is generated, the energy accumulated in the primary winding L71 is released, and the current IL71 drops at a predetermined slope. In this state, the current obtained by subtracting the current IT71 from the current IL71 is smoothed and rectified by the rectifying / smoothing circuit including the diode D71 and the output capacitor C71, and is supplied to the load 80. As a result, the load 8
The DC voltage boosted to 0 is supplied as the voltage V72.

According to such a conventional power supply device, when the power is turned on, the switch SW62 of the relay 62 is turned off, and the rush current from the AC power supply 51 is made to flow only through the reducing resistor R62, and the AC power supply is supplied. 51 to output capacitor C
The inrush current to 71 is suppressed. However, almost simultaneously with this, the power supply voltage V7 of the switching control circuit 71 is
Since 1 rises and the NPN transistor Tr71 starts switching, the current flowing through the inrush current reducing resistor R62 also becomes larger than that when the NPN transistor Tr71 does not perform switching, and the choke coil L71
Since the current flowing through 71 also becomes large, it is necessary to make the choke coil L71 large in order to saturate it. Therefore, the size of the device is increased and the manufacturing cost is increased.

Further, when the capacity of the AC power supply 51 becomes large, the capacity of the output capacitor C71 also has to be made large, and even when the AC power supply 51 is turned off, electric charge remains in the output capacitor C71, and it is touched by mistake. There was a risk of electric shock.

[0021]

In the above conventional power supply device, when the power is turned on, the rush current from the AC power supply to the output capacitor can be suppressed, but at the same time, the step-up chopper circuit controls the step-up, so that the step-up is performed. Since the current flowing through the choke coil of the chopper circuit also becomes large, it is necessary to make the choke coil large in order to saturate it. Also, when the capacity of the AC power supply becomes large, the capacity of the output capacitor must also be made large, and even when the AC power supply is cut off, there is a risk that electric charges will remain in the output capacitor, causing accidental touching and electric shock. .

Therefore, it is an object of the present invention to provide a power supply device, a discharge lamp lighting device and a lighting device capable of suppressing the current flowing in the choke coil of the boost chopper circuit when the power is turned on, and when the AC power supply is turned off. Power supply device, which can discharge the electric charge remaining in the output capacitor to
An object is to provide a discharge lamp lighting device and a lighting device.

[0023]

According to a first aspect of the present invention, there is provided a power supply device in which an AC voltage from an AC power source is converted into a DC voltage by a rectifier circuit, and the DC voltage is boosted by a boost chopper circuit using a choke coil. A power supply device for supplying to a load, which is provided in a path for supplying an AC voltage from the AC power supply to the rectifier circuit, and which limits an inrush current when the AC power supply is turned on, and an inrush current reduction resistance. An inrush current reduction on / off switch which is connected in parallel with the input current from the alternating current power source and closes after being stabilized.
After this inrush current reduction on / off switch is closed,
And a boost control power supply circuit for supplying a power supply voltage for controlling boosting to the boost chopper circuit.

According to a second aspect of the present invention, the power supply device converts an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, and the DC voltage is boosted by a boost chopper circuit using a choke coil and supplied to a load. The discharge resistor is connected in parallel to the output capacitor of the boost chopper circuit, and is connected to a path through which a discharge current flows from the output capacitor to the discharge resistor. And a discharge on / off switch that opens a circuit immediately after the AC power supply is turned on, by supplying a discharge current to the resistor.

According to a third aspect of the present invention, in the power supply device, an AC voltage from an AC power supply is converted into a DC voltage by a rectifier circuit, and the DC voltage is boosted by a boost chopper circuit using a choke coil and supplied to a load. The discharge resistor is connected in parallel to the output capacitor of the boost chopper circuit, and is connected to a path through which a discharge current flows from the output capacitor to the discharge resistor. A discharge on / off switch that causes a discharge current to flow through the resistor and opens immediately after the AC power supply is turned on, and a rush for limiting the inrush current when the AC power supply is turned on, provided in the path for supplying the AC voltage from the AC power supply to the rectifier circuit. It is connected in parallel with the current reduction resistor and this inrush current reduction resistor,
A switch for inrush current reduction on / off that closes after the input current from the AC power supply stabilizes, and a power supply voltage for controlling boosting to the boost chopper circuit after the switch for inrush current reduction on / off closes And a step-up control power supply circuit for controlling the power supply.

According to a fourth aspect of the present invention, a power supply device converts an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, boosts the DC voltage by a boost chopper circuit using a choke coil, and supplies the DC voltage to a load. The discharge resistor is connected in parallel to the output capacitor of the boost chopper circuit, and is connected to a path through which a discharge current flows from the output capacitor to the discharge resistor. A discharge on / off switch that causes a discharge current to flow through the resistor and opens immediately after the AC power supply is turned on, and a rush for limiting the inrush current when the AC power supply is turned on, provided in the path for supplying the AC voltage from the AC power supply to the rectifier circuit. It is connected in parallel with the current reduction resistor and this inrush current reduction resistor,
When the input current from the AC power supply is stabilized and the discharge on / off switch is opened and then closed, the inrush current reduction on / off switch and the inrush current reduction on / off switch are closed, and then the boost chopper circuit is operated to boost the voltage. And a step-up control power supply circuit that supplies a power supply voltage for performing control.

According to a fifth aspect of the present invention, there is provided a discharge lamp lighting device, wherein the load has an inverter that generates a frequency voltage and a discharge lamp that is turned on by an output of the inverter.
The power supply device according to any one of claims 1 to 4 is used as an input power supply of the inverter.

A lighting device according to a sixth aspect of the present invention comprises a fixture body,
It is characterized by comprising a discharge lamp mounted on the main body of the fixture and a discharge lamp lighting device according to claim 5 for lighting the discharge lamp.

According to the configurations of claims 1, 3 and 4,
An inrush current reduction on / off switch connected in parallel with the inrush current reduction resistor is closed after the input current from the AC power supply is stabilized, and then a boost control power supply circuit controls the boost chopper circuit to boost the voltage. Since the power supply voltage for performing the above is supplied, the current flowing through the choke coil of the boost chopper circuit can be suppressed when the power is turned on.

According to the configurations of claims 2, 3 and 4,
A discharge on / off switch is closed when the AC power supply is opened, and a discharge current is caused to flow from the output capacitor to a discharge resistor,
Since the circuit is opened immediately after the AC power supply is turned on, the electric charge remaining in the output capacitor can be discharged when the AC power supply is turned off.

According to the structure described in claim 5, the power supply device according to any one of claims 1 to 4 can be applied to the discharge lamp lighting device.

According to the structure of claim 6, the discharge lamp lighting device according to claim 5 can be applied to a lighting device.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

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

In FIG. 1, the AC power supply 11 has one output terminal connected to one input terminal of the inrush current suppressing circuit 20 via the power switch SW11, and the other output terminal of the other inrush current suppressing circuit 20. Connected to the input terminal.
One and the other output terminals of the inrush current suppressing circuit 20 are connected to one and the other input terminals of the rectifying circuit 12, respectively.

One and the other output terminals of the rectifier circuit 12 are connected to one and the other input terminals of the boost chopper circuit 30, respectively, and are also connected to one and the other input terminal of the boost control power supply circuit 40, respectively. .

The step-up chopper circuit 30 is a step-up chopper in the discontinuous mode, boosts the input DC voltage, and outputs it from the output terminal pair of the positive output terminal 32 and the negative output terminal 33.

The discharging resistor R31 is connected in parallel with the output capacitor C31 of the boost chopper circuit 30. The switch SW44 of the relay 44 is a discharge on / off switch and is connected to a path through which a discharge current flows from the output capacitor C31 to the discharge resistor R31.
When the AC power source is opened (power switch SW11 is off), the circuit is closed to allow a discharge current to flow through the discharge resistor R31.

The inrush current reducing resistor R22 is provided in a path for supplying the AC voltage from the AC power source 11 to the rectifier circuit 12, and limits the inrush current when the AC power source is turned on.

The switch SW22 of the relay 22 is an inrush current reduction on / off switch, which is connected in parallel with the inrush current reduction resistor R22 and closes after the input current from the AC power supply 11 is stabilized.

The step-up control power supply circuit 40 has the step-up chopper circuit 30 after the switch SW22 of the relay 22 is closed.
A power supply voltage V1 for controlling boosting is supplied to.

More specifically, the inrush current suppressing circuit 20 includes a rectifying circuit 21, a smoothing capacitor C21,
The capacitor C22, the resistor R21, the inrush current reducing resistor R22, the switch SW22 and the coil L of the relay 22.
22.

One input terminal of the inrush current suppressing circuit 20 is connected to one input terminal of the rectifying circuit 21 and also one terminal of the switch SW22 of the relay 22. The other terminal of the switch SW22 of the relay 22 is connected to one output terminal of the inrush current suppressing circuit 20. The other input terminal of the inrush current suppression circuit 20 is connected to the other input terminal of the rectifier circuit 21 and is also connected to the other output terminal of the inrush current suppression circuit 20.

One output terminal of the rectifier circuit 21 is connected to the other output terminal of the rectifier circuit 21 via the smoothing capacitor C21, and the resistor R21 and the capacitor C22 are also connected.
It is connected to the other output terminal of the rectifier circuit 21 via a series connection with. The coil L22 of the relay 22 is connected in parallel with the capacitor C22.

An inrush current reducing resistor R22 is connected in parallel to the switch SW22 of the relay 22.

The boost control power supply circuit 40 will be described in detail below.

In the boost control power supply circuit 40, one input terminal is connected to the other input terminal via the primary winding L41 of the transformer 42. One end of the secondary winding L42 of the transformer 42 is connected to one input terminal of the rectifier circuit 43, and the other end of the secondary winding L42 is connected to the other input terminal of the rectifier circuit 43.

One output terminal of the rectifier circuit 43 is connected to the other output terminal of the rectifier circuit 43 through a parallel connection of the smoothing capacitor C41 and the coil L44 of the relay 44,
The rectifier circuit is connected to the other output terminal of the rectifier circuit 43 through the series connection of the resistor R41 and the capacitor C42 of the time constant circuit, and through the series connection of the collector / emitter path of the NPN transistor Tr41 and the capacitor C43. 43 is connected to the other output terminal. The base of the NPN transistor Tr41 is a Zener diode Dz41
Of the resistor R41 and the capacitor C42. The anode of the Zener diode Dz41 is connected to the other output terminal of the rectifier circuit 43. The other output terminal of the rectifier circuit 43 is connected to the other output terminal of the rectifier circuit 12. NP
The emitter voltage V1 of the N-transistor Tr41 is supplied to the switching control circuit 31 of the step-up chopper circuit 30.

The boost chopper circuit 30 will be described in detail below.

In the boost chopper circuit 30, the positive input terminal is connected to the positive output terminal 32 via the choke coil L31 and the anode / cathode path of the diode D31. The cathode of the diode D31 is the output capacitor C3.
1 to the negative output terminal 33. A series connection of a switch SW44 of the relay 44 and a discharging resistor R31 is connected in parallel to the output capacitor C31.
In the boost chopper circuit 30, the negative input terminal is connected to the negative output terminal 33. The load 13 is connected between the positive output terminal 32 and the negative output terminal 33.

In the relay 22, the switch SW22 is turned on when a sufficient current flows through the coil L22, and the switch SW22 is turned off otherwise. Relay 44
The switch SW44 is turned off when a sufficient current flows through the coil L44, and the switch SW44 is turned off otherwise.
44 is turned on.

The switching control circuit 31 is supplied with the voltage V1 at the connection point of the choke coil L31 and the diode D31 as the power supply voltage, and supplies the switching control signal a1 to the NPN transistor Tr31 by this power supply voltage.

The load 13 comprises an inverter 14, a ballast coil L13, a starting capacitor C13, and a discharge lamp 15.

The inverter 14 outputs a frequency voltage from the output terminal pair by the power supply voltage Vout supplied between the output terminals 32 and 33. A series connection of a starting capacitor C13 and a discharge lamp 15 is connected between the output terminal pair of the inverter 14. A starting capacitor C13 is connected in parallel to the discharge lamp 15. With such a connection, the inverter 14 lights the discharge lamp 15.

The inverter 14 can change the output frequency, and has a ballast coil L13 and a starting capacitor C13.
The series resonance circuit of and changes the voltage applied to the discharge lamp 15 according to the output frequency, and filament preheating → starting is possible. When the discharge lamp 15 is lit, adjustment is performed by changing (decreasing) the output voltage of the boost chopper circuit 30 and increasing the impedance value of the ballast coil L13 by changing (increasing) the output frequency. The light can be turned on.

FIG. 2 is a timing chart showing the operation of this embodiment of the invention, FIG. 2 (a) shows the AC power supply voltage Vac applied to the inrush current suppressing circuit 20, and FIG. 2 (b). FIG. 2C shows a switch SW4 of the relay 44, showing ON / OFF of the switch SW22 of the relay 22.
2 shows the voltage V1 supplied to the switching control circuit 31, and FIG. 2 (e) shows the voltage Vout supplied to the load 13 output from between the output terminals 32 and 33. Shows. Further, from timing T1 to timing T6, the AC power supply is in the input state.

In such a power supply device, the case where the AC power supply is opened (power switch SW11 is off) will be described. In this case, the AC power supply voltage Vac applied to the inrush current suppressing circuit 20 shown in FIG. 2A is in the 0V state, the AC power supply voltage is not supplied to the rectifier circuits 12 and 21, and the DC voltage is not generated. Inrush current suppression circuit 20
No current flows through the coil L22 of the relay 22 of FIG.
As shown in (b), the switch SW22 of the relay 22 maintains the off state. Further, since the AC power supply voltage is not supplied to the primary winding L41 of the transformer 42 of the step-up control power supply circuit 40, the rectifier circuit 43 is not supplied with the AC power supply voltage and does not generate the DC voltage. No current flows through L44, and as shown in FIG. 2C, the switch SW44 of the relay 44 maintains the ON state. In addition, the voltage V1 of the emitter of the NPN transistor Tr41
2D, as shown in FIG. 2D, the voltage becomes 0 V, the switching control signal a1 output from the switching control circuit 31 becomes a non-signal state, and the NPN transistor Tr31 maintains the off state. In this state, the positive output terminal 32
The voltage Vout between the negative polarity output terminal 33 and
As shown in (e), becomes 0V, and the power supply voltage is not supplied to the load 13.

Next, description will be made on the timing T1 when the AC power is turned on (the power switch SW11 is switched from the off state to the on state). In this case, the power switch SW11 is switched from the off state to the on state, and the AC power supply voltage Vac applied to the inrush current suppressing circuit 20 shown in FIG. 2A has a sine wave state, but immediately after switching to the on state. , The relay 2 as shown in FIG.
The switch SW22 of No. 2 maintains the OFF state, and the AC power source 1
Since the alternating current from 1 flows only through the inrush current reducing resistor R22, the alternating current from the alternating current power supply 11 to the output capacitor C3.
Inrush current to 1 is suppressed. Almost at the same time, the output voltage of the rectifier circuit 43 starts to rise, and the resistance R of the time constant circuit is increased.
The voltage V1 shown in FIG. 2 (d) starts to rise due to the inclination based on 41 and the capacitor C42, but both of them are still low in level, so that the switch SW44 of the relay 44 is turned on as shown in FIG. 2 (c). The ON state is maintained, the switching control circuit 31 does not switch the NPN transistor Tr41, and as shown in FIG.
out rises at a low level. After that, at a timing T2 after a lapse of a predetermined time, as shown in FIG. 2C, the switch SW44 of the relay 44 is turned off,
After this, at a timing T3 after a lapse of a predetermined time, as shown in FIG.
W22 is turned on, the AC voltage from the AC power supply 11 is directly applied to the rectifier circuit 12 and the primary winding L41 of the transformer 42, and the resistor R41 and the capacitor C4 of the time constant circuit.
The voltage V1 shown in FIG. 2 (d) rises with a slope based on 2, but the switching control circuit 31 does not switch the NPN transistor Tr41, and the output voltage Vout is low as shown in FIG. 2 (e). There are still levels.
After this, at a timing T3 after a lapse of a predetermined time, the voltage V1 shown in FIG. 2 (d) becomes a level for operating the switching control circuit 31, and the NPN transistor T
r41 starts switching.

When the NPN transistor Tr31 is turned on in the switching state of the NPN transistor Tr41, the current IT31 flowing through the NPN transistor Tr31 is the current IL3 flowing through the choke coil L31.
It is the same as 1. In this case, since a counter electromotive force is generated in the choke coil L31, the current IL31 flowing from the choke coil L31 rises with a predetermined inclination. After this, N
The PN transistor Tr31 is turned off and the current IT
31 becomes 0. When the current IT31 is switched to 0, a counter electromotive force is generated in the primary winding L31 of the choke coil L31, the energy accumulated in the choke coil 31 is released, and the current IL31 drops with a predetermined gradient. In such a state, the current obtained by subtracting the current IT11 from the current IL11 is smoothed and rectified by the smoothing circuit including the diode D11 and the output capacitor C12, and the load 30
Is supplied to. As a result, as shown in FIG.
The output voltage Vout becomes a high level, and the boosted DC current is supplied as the voltage Vout to the load 30.

After that, the case where the power is switched from the on state to the off state at the timing T5 will be described. In this case, the power switch SW11 switches from the ON state to the OFF state, and the AC power supply voltage Vac applied to the inrush current suppressing circuit 20 shown in FIG. 2A is in the 0V state, but immediately after switching to the OFF state. , Fig. 2 (b)
2, the switch SW22 of the relay 22 maintains the ON state, the switch SW44 of the relay 44 maintains the OFF state, as shown in FIG. 2C, and energy is stored in C31 in the output capacitor. Therefore, FIG. 2 (e)
As shown in Fig. 2, the voltage Vout maintains the same level, but thereafter, at timing T6, when the switch SW44 of the relay 44 is turned on as shown in Fig. 2C, the smoothing capacitor is switched to C31. The stored energy is rapidly released through the discharge resistor R31, and
As shown in (e), the voltage Vout drops rapidly.
After that, at the timing T7 due to the time constant of the resistor R41 and the capacitor C42, the voltage V1 is lowered, the switching control circuit 31 is turned off, and the switching of the NPN transistor Tr41 is stopped, as shown in FIG. 2 (d). After this, the discharging resistor R31 and the capacitor C32
The switch SW22 of the relay 22 is turned off at the timing T8 due to the time constant of, and returns to the original state as shown in FIG.

According to this embodiment of the invention, when the power is turned on, the switch SW22 of the relay 22 is turned off, and the AC power supply voltage from the AC power supply 11 is made to flow only through the inrush current reducing resistor R22. When a rush current flows from the AC power supply 11 to the output capacitor C31, almost simultaneously with this, the power supply voltage V1 of the switching control circuit 31.
Can be prevented and the switching of the NPN transistor Tr31 of the switching element can be prevented, so that the current flowing through the choke coil L31 can be suppressed and the choke coil L31 can be downsized.
It is possible to downsize the power supply device and reduce the manufacturing cost. In addition, the current flowing through the rush current reduction resistor R22 can be suppressed, and the size can be reduced.

Further, when the supply of the AC power supply 11 is stopped, the switch 44 of the relay 44 is turned on, and it can be discharged through the discharging resistor R31 of the output capacitor C31, preventing the electric charge from remaining in the output capacitor C31. This can prevent accidental touching and electric shock.

FIG. 3 is a perspective view showing an illumination device by a discharge lamp lighting device to which the embodiment of the invention of FIG. 1 is applied.

In FIG. 3, a lighting device 401 has a discharge lamp 15 installed between sockets 402 and 403, and a discharge lamp lighting device (the discharge lamp 15 shown in FIG.
The part 10 except 1) is built in, and the discharge lamp 15 is turned on by the discharge lamp lighting device 10.

With such a structure, the embodiment of the invention shown in FIG. 1 can be applied to a lighting device.

In the embodiment of the invention shown in FIG. 1,
Although the NPN transistor is used as the switching element, a switching element other than the NPN transistor, for example, a normal FET may be used. Also,
In the embodiment of the invention shown in FIG. 1, a discharge resistor and a discharge on / off switch are provided as means for suppressing the current flowing in the choke coil of the boost chopper circuit, and the charge remaining in the output capacitor when the AC power supply is cut off is provided. Although the boost control power supply circuit is provided as the discharging means, only one of these two means may be provided.

[0067]

According to the present invention, since the current flowing through the choke coil of the boost chopper circuit can be suppressed when the power is turned on, the choke coil can be downsized and the power supply device, the discharge lamp lighting device and the lighting device can be provided. It is possible to reduce the size and the manufacturing cost. Further, since the electric charge remaining in the output capacitor can be discharged when the AC power supply is turned off, it is possible to prevent accidental touch and electric shock.

[Brief description of drawings]

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

FIG. 2 is a timing chart showing the operation of the embodiment of the invention.

FIG. 3 is a perspective view showing an illumination device by a discharge lamp lighting device to which the embodiment of the invention of FIG. 1 is applied.

FIG. 4 is a circuit diagram showing such a conventional power supply device.

[Explanation of symbols]

 11 AC power supply 12 Rectifier circuit 13 Load 20 Inrush current suppression circuit 22,44 Relay 30 Boost chopper circuit 40 Boost control power circuit R31 Discharge resistor SW11 Power switch SW22, SW44 switch R22 Inrush current reduction resistor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location H02M 7/217 8726-5H H02M 7/217 H05B 41/29 H05B 41/29 C

Claims (6)

[Claims] 1. A power supply device for converting an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, boosting the DC voltage by a boost chopper circuit using a choke coil, and supplying the load to a load. An inrush current reducing resistor that limits the inrush current when the alternating current power is turned on, and an inrush current reducing resistor that is connected in parallel to the inrush current reducing resistor when the alternating current voltage from The inrush current reduction on / off switch that closes after the circuit is stabilized, and after the inrush current reduction on / off switch closes,
A booster control power supply circuit that supplies a power supply voltage for controlling boosting to the booster chopper circuit, and a power supply device. 2. A power supply device for converting an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, boosting the DC voltage by a boost chopper circuit using a choke coil, and supplying the boosted load to a load. A discharge resistor connected in parallel to the output capacitor of the circuit, and connected to a path through which a discharge current flows from the output capacitor to the discharge resistor, and closed when the AC power supply is open to flow a discharge current to the discharge resistor, A power supply device comprising: a discharge on / off switch that opens immediately after the AC power is turned on. 3. A power supply device for converting an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, boosting the DC voltage by a boost chopper circuit using a choke coil, and supplying the boosted load to a load. A discharge resistor connected in parallel to the output capacitor of the circuit, and connected to a path through which a discharge current flows from the output capacitor to the discharge resistor, and closed when the AC power supply is open to flow a discharge current to the discharge resistor, A discharge on / off switch that opens immediately after the AC power is turned on, a rush current reduction resistor that is provided in a path for supplying an AC voltage from the AC power source to the rectifier circuit, and limits the rush current when the AC power is turned on. An inrush current reduction on / off switch that is connected in parallel to the current reduction resistor and closes after the input current from the AC power supply stabilizes, and this inrush current. After the flow reduction on-off switch is closed,
A booster control power supply circuit that supplies a power supply voltage for controlling boosting to the booster chopper circuit, and a power supply device. 4. A power supply device for converting an AC voltage from an AC power supply into a DC voltage by a rectifier circuit, boosting the DC voltage by a boost chopper circuit using a choke coil, and supplying the boosted load to a load. A discharge resistor connected in parallel to the output capacitor of the circuit, and connected to a path through which a discharge current flows from the output capacitor to the discharge resistor, and closed when the AC power supply is open to flow a discharge current to the discharge resistor, A discharge on / off switch that opens immediately after the AC power is turned on, a rush current reduction resistor that is provided in a path for supplying an AC voltage from the AC power source to the rectifier circuit, and limits the rush current when the AC power is turned on. A protrusion connected in parallel with the current reduction resistor to stabilize the input current from the AC power supply and to close the discharge on / off switch after opening. A switching current reduction off, after the rush current reduction off switch is closed,
A booster control power supply circuit that supplies a power supply voltage for controlling boosting to the booster chopper circuit, and a power supply device. 5. The load has an inverter that generates a frequency voltage and a discharge lamp that is lit by the output of the inverter, and the load serves as an input power source of the inverter. A discharge lamp lighting device, characterized in that the power supply device according to (1) is used. 6. A lighting device comprising: a fixture main body; a discharge lamp mounted on the fixture main body; and a discharge lamp lighting device according to claim 5, which lights the discharge lamp.