JPH07288985A - Power supply system - Google Patents

Abstract

PURPOSE:To provide a power supply system in which the distortion of an input current of a power supply, comprising an inverter section fed with a DC voltage obtained by rectifying and smoothing the voltage of an AC power supply, can be improved through a simple circuit for simply applying a high frequency voltage of another power supply to a power supply input section while superposing. CONSTITUTION:The power supply system comprises a first power supply unit 31 for converting the voltage of an AC power supply AC1 through a rectifier circuit section DB1 into a DC ripple voltage which is converted through a power supply section 11 into a high frequency voltage fed to a load 41, and a second power supply 32 for converting the voltage of an AC power supply AC2 through a rectifier circuit section DB2 into a DC ripple voltage which is converted through a power supply section 12 into a high frequency voltage applied to a load 42. The high frequency voltage from the power supply section 11 is applied to a high frequency superposing section 2 disposed in front or rear of the rectifier circuit section DB2 of the second power supply unit 32 thus improving distortion of the input current of the second power supply unit 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system provided with a plurality of power supply devices for converting an AC power supply into a DC voltage and using the DC voltage as a power supply for conversion into a high frequency.

[0002]

2. Description of the Related Art Conventionally, as a power supply device, an AC power supply is rectified by a rectifier circuit section composed of a diode bridge and further smoothed by a smoothing capacitor, and the smoothed direct current is constituted by a switching element, a choke, a capacitor and the like. There is a device for supplying the converted high frequency voltage to the load and supplying the converted high frequency voltage to the load. In this capacitor input type system, the input current of the power supply device is distorted and the power factor of the input power supply is poor. In order to improve it, a method of connecting a DC-DC converter circuit to the power supply circuit section and improving the power factor is commonly used. However, this method requires a DC-DC converter circuit, which makes the entire device large and costly. Therefore, as a method of improving the power factor with a simple circuit configuration without requiring a complicated circuit such as a DC-DC converter, the output of the high frequency voltage of the inverter circuit is input as a power source as shown in Japanese Patent Publication No. 5-9918. There is a method of improving the distortion of the input current by returning to the site side. In this method, the high-frequency voltage to be fed back is superimposed on the power supply voltage so that the voltage between the output terminals of the rectifier circuit section is lower than the input terminal of the rectifier circuit section in a pulse train over the entire cycle of the AC power supply voltage. As a result, an input current in the form of a pulse train is made to flow over the entire period of one cycle of the AC power supply voltage, and the feedback of the input current per one cycle of the voltage is expanded by the AC power supply, the distortion of the input current is improved, and the input power factor is improved. It is intended to improve.

[0003]

By the way, for example, when the load is a discharge lamp, when a plurality of discharge lamps having different W numbers are lit in the same fixture, or when the discharge lamp is used, a color combination of RGB light colors is used. When a plurality of lighting fixtures are required, such as a variable lamp or a building or an office, a plurality of power supply devices constituting a discharge lamp lighting device are required. In that case, since the power supply devices, which are a plurality of discharge lamp lighting devices, operate at the same time to light the discharge lamps, it is particularly necessary to improve the input current distortion. As mentioned above, the method of returning the high frequency voltage to the power input part side is an advantageous method in terms of cost. However, if countermeasures are taken for individual devices as described above, a large number of discharge lamp lighting devices as described above are provided. When using, there was a problem that the cost would be high in total.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power source having an inverter section using a direct current obtained by rectifying and smoothing an AC power source as a power source. The input current distortion of the device can be improved by a simple circuit configuration in which the high frequency voltage of another power supply device is superimposed and applied to the power input part of the power supply device, and the high frequency output of the power supply device includes the ripple component of the AC power supply frequency. It is to provide a power supply system that can be stable.

The object of the invention of claim 2 is that, in addition to the object of the invention of claim 1, the first power supply device has a no-load state and the like, and the output of the inverter part increases. Another object of the present invention is to provide a power supply system that can reduce the stress of the second power supply device by superimposing it on the power supply device side. The object of the invention of claim 3 is, in addition to the objects of the inventions of claims 1 and 2, that the improvement of the distortion of the input current of the first and second power supply devices can be improved by the superimposed application of mutual high-frequency voltage, Moreover, it is another object of the present invention to provide a power supply system capable of compensating for the outputs of the inverters of both power supply devices and reducing the stress of the inverters of both power supply devices when there is no load.

An object of the invention of claim 4 is to provide a power supply system capable of simplifying the circuit and reducing the cost by sharing the circuit in addition to the object of the invention of claim 1. The object of the invention of claim 5 is to claim 1
In addition to the object of the invention described above, even when the load capacity of the second power supply device is large, it is possible to reduce the influence on the high-frequency output of the first power supply device that superimposes the high-frequency voltage on the second power supply device. In providing the system.

The object of the invention of claim 6 is, in addition to the object of claim 5, to provide a power supply system capable of collectively improving the distortion of the input current of a plurality of second power supply devices. It is in. An object of the invention of claim 7 is to provide a power supply system which achieves the same object as that of claim 1.

[0008]

In order to achieve the above object, according to the invention of claim 1, a first power supply device having means for generating a high frequency voltage, and an AC power supply connected to convert the AC voltage into a DC voltage. Second power supply device configured to include a rectifying circuit unit that performs the smoothing, a smoothing capacitor that is connected to the rectifying circuit unit to smooth the DC voltage, and an inverter unit that uses the smoothing capacitor as a power source to convert the DC voltage into a high frequency voltage. And a high-frequency superimposing means for superimposing and applying the high-frequency voltage of the first power supply device to the power supply input portion before the smoothing capacitor of the second power supply device.

According to a second aspect of the present invention, in the first aspect of the invention, the high frequency voltage of the second power supply device is superimposed and applied to the power supply input portion of the first power supply device. According to a third aspect of the invention, in the first aspect of the invention, the first power supply device includes a rectifier circuit section for converting an AC voltage of the AC power supply into a DC voltage.
A smoothing capacitor connected to the rectifier circuit unit for smoothing the DC voltage, and an inverter unit for converting the DC voltage into a high frequency voltage by using the smoothing capacitor as a power source are provided, and the high frequency voltage of the second power supply device is placed before the smoothing capacitor. The voltage is applied to the power input part in a superposed manner.

According to a fourth aspect of the present invention, in the third aspect of the invention, both power supply devices are connected to the same AC power supply while sharing the rectifying circuit section of the first and second power supply devices. According to a fifth aspect of the present invention, in the first aspect of the present invention, a plurality of first power supply devices are provided, and high-frequency voltage is supplied from at least one of the first power supply devices before the smoothing capacitor of the second power supply device. It is applied in a superimposed manner on the input site.

According to a sixth aspect of the invention, in the first aspect of the invention, a plurality of first power supply devices and a plurality of second power supply devices are provided, and the smoothing capacitors of these second power supply devices are provided before the smoothing capacitors. The high frequency voltage of the first power supply device is superimposed and applied to the power input portion. According to the invention of claim 7, in the invention of claim 1, a chopper circuit is provided in the first power supply device, and a high frequency voltage generated from this chopper circuit is superimposed on a power supply portion of the second power supply device before the smoothing capacitor. It is applied.

[0012]

According to the first aspect of the present invention, there is provided a first power supply device having a means for generating a high frequency voltage, a rectifying circuit section connected to an AC power source for converting the AC voltage into a DC voltage, and connected to the rectifying circuit section. A smoothing capacitor that smoothes the DC voltage,
A second power supply device configured to include an inverter unit that converts a DC voltage into a high frequency voltage by using the smoothing capacitor as a power supply, and the first power supply device has a first power supply input portion in front of the smoothing capacitor. Since at least a high-frequency superimposing means for superimposing and applying the high-frequency voltage of the power supply device is provided, a rectifier circuit section and an inverter section using a direct current obtained by rectifying and smoothing an AC power source by a smoothing capacitor as a power source are provided. The input current distortion of the power supply device can be improved with a circuit that has a small number of parts, has a simple configuration, and is inexpensive, and since the feedback circuit is not provided in the self circuit, the high frequency output of the second power supply device It is possible to make it stable without including ripple components.

According to the second aspect of the present invention, since the high frequency voltage of the second power supply device is superimposed and applied to the power supply input portion of the first power supply device, a no-load state or the like occurs in the second power supply device and the inverter is Even if the output of the unit increases, the stress of the second power supply device can be reduced by superimposing it on the first power supply device side. According to the third aspect of the present invention, the first power supply device includes a rectifying circuit unit for converting an AC voltage of an AC power supply into a DC voltage, a smoothing capacitor connected to the rectifying circuit unit for smoothing the DC voltage, and a smoothing capacitor. And an inverter unit for converting a DC voltage into a high-frequency voltage, and the high-frequency voltage of the second power supply device is superimposed and applied to the power supply input portion before the smoothing capacitor. The distortion of the input current can be improved by the mutual application of the high-frequency voltages, and the outputs of the inverters of both power supply devices can be complemented with each other, and the stress of the inverter parts of both power supply devices under no load can be reduced.

According to the invention of claim 4, since both power supply devices are connected to the same AC power supply while sharing the rectifying circuit section of the first and second power supply devices, the circuit is simplified by sharing the circuit. Cost reduction can be achieved. According to the invention of claim 5,
Since a plurality of first power supply devices are provided and the high-frequency voltage from at least one of the first power supply devices is superimposed and applied to the power supply input portion before the smoothing capacitor of the second power supply device, Even when the load capacity is large, it is possible to realize a power supply system that can reduce the influence on the high frequency output of the first power supply device that superimposes the high frequency voltage on the second power supply device.

According to the invention of claim 6, a plurality of first power supply devices and a plurality of second power supply devices are provided, and these second power supply devices are provided.
Since the high frequency voltage of the first power supply device is superimposed and applied to the power supply input portion before the smoothing capacitor of the second power supply device, the distortion of the input current of the plurality of second power supply devices can be collectively improved. The system can be realized. According to the invention of claim 7, in the invention of claim 1, a chopper circuit is provided in the first power supply device, and a high-frequency voltage generated by this chopper circuit is supplied to a power source part before the smoothing capacitor of the second power supply device. The input current distortion of the second power supply device can be improved with a circuit having a small number of parts, a simple configuration, and a low cost, and a feedback circuit is not provided in the self power supply circuit. The high-frequency output of can be made stable without including the ripple component of the AC power supply frequency.

[0016]

【Example】

 (Embodiment 1) FIG. 1 shows a block diagram of this embodiment.
In this embodiment, the AC power supply AC₁Rectifier circuit DB₁To
Convert it to a DC pulsating voltage, and convert the DC pulsating voltage to the first voltage.
Source 1 ₁Supply to this first power supply unit 1₁Change to high frequency with
Replace the high frequency output with load 4₁First electricity to supply to
Source device 3₁And AC power supply AC₂Rectifier circuit DB₂At
Converted to DC pulsating voltage, and the DC pulsating voltage is converted to the second power supply.
Part 1₂Supply to this second power supply unit 1₂To high frequency voltage
Convert and convert the high frequency voltage to load 4₂Second voltage applied to
Source device 3₂And the first power supply unit 1₁High frequency voltage
The second power supply 3₂Rectifier circuit DB₂Before or after
The high-frequency superimposing section 2 provided is superposed and applied to the second power supply 3
₂It improves the distortion of the input current of.

[0017] Figure 2 shows a detailed circuit of the embodiment circuit, a rectifier circuit portion DB _1, DB ₂ consisting of each power supply 3 _1, 3 ₂ of the diode bridge is an AC power source AC _1, AC
₂ is connected via chokes L ₀₁ and L ₀₂ for a filter, and the AC power supply voltage is full-wave rectified to obtain a DC pulsating voltage, and the DC pulsating voltage is supplied to the first and second power supply devices 3 ₁ , 3 ₂ of the power supply unit 1 _1, 1 ₂ are adapted to each application.

The power supply unit 1 ₁ of the first power supply device has a smoothing capacitor C ₀₁ connected to the rectifier circuit unit DB ₁ via a high frequency cutting choke L ₁ and has a smoothing capacitor C _01.
The direct current smoothed by the converter is converted into a high frequency by the inverter unit 5 ₁ , and the high frequency voltage obtained by this conversion is applied to the load 4 ₁ . The inverter unit 5 ₁ is composed of a series inverter type circuit in which a smoothing capacitor C ₀₁ is connected to a series circuit of switching elements Q ₁ and Q _{2 made} of MOSFETs, and a DC cutting capacitor C ₃ is provided for the switching element Q _1. through to the resonant capacitor C _4, 1 of the feedback transformer T ₁ winding n ₁
The series circuit of is connected in parallel and the switching element Q
The _1, Q ₂ alternating on and off, the resonant capacitor C _4, the resonance operation of the primary winding n ₁ of the inductance of the feedback transformer T _1, connected in parallel to a resonance capacitor C ₄ It is designed to supply high frequency power to the load circuit.

The switching elements Q ₁ and Q ₂ are turned on / off by a feedback winding n ₂ wound around a feedback transformer T ₁ .
n ₃ is performed by the self-oscillation operation of feedback resonance voltage through the resistor R _2, R ₃ to the gate of the switching element Q _1, Q ₂ by. The start-up when the power is turned on is performed by the starting circuit of the resistor R ₁ , the capacitor C ₂ , and the diac Q ₃ , and the capacitor C ₂ is charged via the resistor R ₁ , and the charging voltage is the breakover voltage of the diac Q _3. Is reached and the diac Q ₃ is turned on, the charging voltage of the capacitor C ₂ is switched via the diac Q ₃ to the switching element Q 3.
The switching element Q ₂ by applying to the _second gate
Turn on and start.

[0020] the resonant capacitor C ₄ is connected to the insulated connecting the primary winding N ₁ of the output transformer T ₂ consisting of a transformer, the secondary winding N ₂ of the output transformer T ₂ and supplies the high frequency power to the load 4 _1.
Further, the output transformer T ₂ is connected to the respective power supply section 1 ₁ and windings N ₃ and N ₄ which constitute feedback means for improving the input current waveform of the power supply section 1 ₂ .

In the power supply unit 12, a smoothing capacitor C ₀₂ is connected to the rectifier circuit unit DB ₁ , and a smoothing capacitor C ₂ is connected.
_The direct current obtained by smoothing by ₂ is converted into a high frequency by the inverter unit 5 ₂ and supplied to the load 4 ₂ . The inverter unit 5 ₂ is basically the inverter unit 5 ₁
It is composed of a series inverter type circuit that operates in the same manner as in the above, but in the inverter section 5 ₁ , the resonance capacitor C is used.
₄ is connected to the load 4 ₁ via the output transformer T ₂ , whereas the inverter unit 5 ₂ is different in that the load 4 ₂ is directly connected in parallel to the resonance capacitor C _4. . The circuit elements of the inverter unit 5 ₂ which perform the same operation as the inverter unit 5 ₁ are designated by the same reference numerals and the description thereof is omitted.

The winding N ₃ of the output transformer T ₂ is connected to the output terminal side of the rectifying circuit portion DB ₁ of the first power supply device 3 ₁ through a DC cut capacitor C _11, and the winding N ₃ is connected. ₃
The high frequency voltage generated at the DC voltage is applied to the DC pulsating current voltage of the rectifier circuit portion DB _{1 in} a superimposed manner. The high-frequency voltage is superimposed and applied, the high-frequency cut choke L ₁ and the low-pass filter choke L ₀₁ are used to obtain the above-mentioned Japanese Patent Publication No. 5-9918.
The distortion of the input current of the first power supply device 3 ₁ is improved by the same operation as the circuit of No.

On the other hand, the output transformer T₁Winding N_FourIs
Second power supply 3₂Rectifier circuit DB₂Between the input ends of
Flow cut capacitor C₁₂Connected through the winding N_Four
High frequency voltage generated in the rectifier circuit DB₁Input side AC
The voltage is superimposed and applied. This superposition and
-Choke for pass filter L₀₂And the second power supply 3 ₂
It improves the distortion of the input current.

In this way, the power supply unit 1 of the _second power supply device 3 _2
No winding means for feeding back the high frequency output to the input side is required for 2 and distortion of the input current can be easily improved. Further, although a ripple component of the frequency of the AC power supply AC ₁ appears in the output of the power supply section 1 ₁ of the first power supply apparatus 3 ₁ , there is no effect on the output of the power supply section 1 ₂ of the _second power supply apparatus 3 _2. . Similarly, even if a plurality of _second power supply devices 3 ₂ are connected to the third and fourth power supply devices, the feedback means from the _first or _second power supply part 1 ₁ or 1 ₂ can easily distort the input current. It can be improved, also regardless of the one winding means as a feedback means may be provided with a plurality of feedback means, and also where to feedback is not limited to one location, the input of the rectifier circuit DB ₂ May be returned to a plurality of places such as both the output side and the output side.

In other words, the means for improving the distortion of the input current most effectively is not limited to this. Further, each of the inverter units 5 ₁ and 5 ₂ is not particularly limited to the series inverter type circuit of the embodiment, and as a means for feeding back a high frequency output, as shown in the embodiment, an output transformer composed of an insulation type transformer. Although T ₂ is used, the method is not particularly limited to this method, and any method may be used as long as it is a means for feeding back a high frequency voltage.

In the present embodiment described above, a means for feeding back a high frequency voltage is provided in one of the power supply units 1 ₁ and 12 of the _two power supply units 3 ₁ and 3 ₂ , and the high frequency power is supplied to the self and the other power supply input portion. By applying the voltage in a superimposed manner, the distortion of the input current of the entire device is improved, so that the circuit configuration is simple, the number of circuit components can be reduced, and the cost can be reduced. No power supply unit (1 in the embodiment)
_{In 2} ), there is an advantage that there is no problem that a ripple component of the frequency of the AC power source appears in the high frequency output, which is a drawback when the high frequency voltage is superimposed and applied.

Further, when the input AC power supply voltage is the two power supply devices 3 ₁ ,
3 ₂ different (for example, AC100V / AC200
V), it is possible to easily cope with the difference in the input AC power supply voltage as compared with the case of the fifth embodiment described later. (Embodiment 2) In the above-mentioned Embodiment ₁ , a high-frequency voltage feedback means is provided in the power supply unit 1 ₁ of one power supply device 3 _{1 so} as to superimpose and apply it to its own power supply input portion, and the other power supply device 3 ₂ Although it is designed to apply the voltage to the power input portion of the power supply section 1 _{2 in} a superimposed manner, in this embodiment, the AC power supply AC ₁ is converted into a DC pulsating voltage by the rectification circuit section DB ₁ as shown in FIG. conversion, and supplies the DC pulsating voltage to the first power supply unit 1 ₁ is converted by the first power source unit 1 ₁ to a high frequency voltage, the high-frequency voltage to the load 4 ₁ to the application supplies a first power supply Device 3
_1, the AC power source AC ₂ was converted into a DC pulsating voltage at the rectifier circuit DB _2, the high frequency and the DC ripple voltage is supplied to the second power supply unit 1 ₂ in the second power supply unit 1 ₂ Convert to voltage,
The second power supply device 3 for applying the high frequency voltage to the load 4 _2.
Consists of _two Metropolitan superimposes applying a first of the high-frequency voltage from the power supply unit 1 ₁ to the high-frequency superimposing unit 2 ₂ which is provided to the second power supply device 3 ₂ before or after the rectifier circuit DB _2, a second power supply Device 3
₂ the distortion of the input current is improved, and the high frequency voltage of the _second power supply unit 1 ₂ is supplied to the rectifier circuit unit DB of the _first power supply unit 3 _1.
It is superimposed on the high frequency superimposing section 2 ₁ provided before or after 1
The input current distortion of the power supply device 3 ₁ is improved.

FIG. 4 shows a specific circuit of this embodiment.
Each power supply device 3 of this embodiment₁, 3₂First and second power supply units
1₁, 1₂Inverter part 5 provided in₁, 5₂Is Figure 2
The circuit has substantially the same configuration as the circuit of the first embodiment shown in
Holding element Q₁, Q₂Is a bipolar transistor
In the first embodiment, the parasitic diode of MOSFET is used.
The diode D as the flyhole diode that was used
₁, D₂Each switching element Q₁, Q₂In parallel with
In the following points, the inverter unit 5 of the first embodiment₁5, ₂And the difference
is doing. The inverter unit 5 of the present embodiment₁5,₂Carried out in
Inverter unit 5 of Example 1₁, 5₂A circuit element that performs the same operation as
The same symbols and numbers are given to the children, and the description thereof is omitted.

Further, the output transformer T ₂ of the power supply unit 1 ₁ of the first power supply device 3 ₁ has a feedback winding N ₄ for superimposing and applying a high frequency output to the power supply input portion of the _second power supply device 3 _2.
And the point that it does not return to the self circuit,
In the same manner as the power supply unit 1 ₁ , the power supply unit 1 ₂ of the second power supply unit 3 ₂ is connected to the resonance capacitor C ₄ and the primary winding N ₁ of the output transformer T ₂ 'which is an insulating transformer. Load 4 ₂ connected to secondary winding N ₂ of output transformer T ₂ '
Of the first embodiment in that a high frequency voltage is applied and supplied to the output transformer T ₂ ′, and a high frequency output is superimposed and applied to the power input portion of the first power supply device 3 ₁ by the feedback winding N ₄ provided in the output transformer T ₂ ′. It is different from the circuit.

Here, the first power supply device 3₁AC power supply A
C₁And rectifier circuit DB₁Capacitor C between₆And J
Joke L₂And a filter circuit composed of
Part 2 ₁And are intervening. High frequency superimposing section 2₁Is the power path
Capacitor C connected in parallel to₇And inserted in series
Choked L₃And the rectifier circuit DB₁Connect between the input terminals of
Capacitor C₈, The second power supply unit 1₂Output tiger
T₂′ Feedback winding N_FourAnd a series circuit of
Feedback winding N_FourThe second power source unit 1 output by₂High
Frequency output DB for rectifier circuit₁Superimposed on the input AC power supply voltage of
It is designed to be applied. Here, the high frequency
Tatami part 2₁The operation of Conden C₈Both
Terminal voltage and feedback winding N₃Is superimposed on the high frequency voltage
The AC power supply voltage is flat over the entire area of one cycle.
Sliding capacitor C₀₁Since it is higher than the voltage across
The smoothing capacitor is used as the chopping current in the entire region.
Sensor C₀₁Charging current flows to the₁of
The input current flows and flows in over almost the entire voltage cycle.
Distortion can be improved by eliminating the pause section of force current.
Of.

[0031] On the other hand the second power supply 3 _2, AC power supply AC
_A filter circuit composed of a choke L ₀₂ and a high frequency superimposing section 2 ₂ are interposed between ₂ and the rectifier circuit section DB ₂ . The high-frequency superposition section 2 ₂ is composed of a capacitor C ₉ connected in parallel to the power supply path and a feedback winding N ₄ of the output transformer T ₂ of the first power supply section 1 ₁ inserted in series. The high frequency voltage of the first power supply unit 1 ₁ output by the winding N ₄ for superimposition is applied to the input AC power supply voltage of the rectifier circuit unit DB ₂ .

In this way, the first and second power supply devices 3 ₁ and 3 ₂ apply the high-frequency voltage of the power supply parts 1 ₁ and 1 ₂ to the power supply input portions in a superimposed manner, thereby causing the waveform distortion of the input current. To improve. By the way, in the circuit of FIG. 4, loads 4 ₁ , 4 ₂ connected to the respective power supply devices 3 ₁ , 3 ₂ are connected.
Is a discharge lamp, the discharge lamp as a load is turned on by each of the power supply devices 3 ₁ and 3 _2. For example, it is required that two discharge lamps be turned on at the same time to output a certain constant light output. In this case, when one of the discharge lamps is removed, it is effective that the light output can be supplemented by the remaining discharge lamps. That is, the present embodiment is realized in the form of responding to this request, and the operation when the loads 4 ₁ and 4 ₂ are discharge lamps will be described below.

First, the power supply units 1 ₁ of the power supply units 3 ₁ and 3 ₂ ,
1 ₂ of the inverter section 5 _1, 5 ₂ in the switching operation of the switching elements Q _1, Q _2, feedback transformer T ₁
The resonance energy of the capacitor C ₄ is applied to the loads 4 ₁ and 4 ₂ composed of discharge lamps by the resonance operation of the inductance of the primary winding n ₁ and the resonance capacitor C ₄ at the output transformers T ₂ and T ₂ ′. We are supplying. Here, when the discharge lamps serving as the loads 4 ₁ and 4 ₂ are normally lit, it means that the equivalent resistance of the connected discharge lamp is connected in parallel to the resonance capacitor C ₄ and the feedback transformer T ₁ of the primary winding n ₁
It is lit at a stable point deviated from the resonance point between the capacitor C ₄ and the capacitor C _4, and each secondary winding N ₂ of each output transformer T ₂ , T ₂ 'has only a high frequency voltage corresponding to the tube voltage of the discharge lamp. Does not occur.

When the discharge lamp is removed here, the above resonance point
Feedback transformer T at a frequency close to ₁Primary winding n₁When
Capacitor C_FourSince and operate in resonance, capacitor C_Four
The voltage across both ends will rise. That is, the first power supply device 3
₁Load 4₁When the barrel discharge lamp is removed, the power supply unit 1₁Out of
Power transformer T₂Secondary output voltage rises,
Lance T₂Feedback winding N wound around_FourOf the feedback voltage
Amplitude increases. Therefore, the second power supply 3₂High
Frequency superimposing section 2₂The high frequency voltage applied to the
The amount of return will increase. Therefore, the second power supply unit 1₂For smoothing
Capacitor C₀₂The charge amount of the smoothing capacitor increases
C₀₂Charging voltage increases. At this time, the second power supply unit 1₂
Since the input power supply voltage of₂Together
The vibration is strengthened, and the second power supply device 3₂Load 4 connected to₂
The light output of the barrel discharge lamp increases and the light output is
It will happen. Also, the first power supply device 1₂At the load
Four ₁Since the barrel discharge lamp is removed, the inverter unit 5₁Together
Vibration becomes stronger and switching element Q₁, Q₂The stress of
Second power supply 3₂Power supply 1₂For output
Transformer T₂′ Feedback winding N_FourBy resonance energy
The first power supply 3 ₁High frequency superposition section 2₁Superimposed on
Therefore, the first power supply device 3₁Power supply 1₁Inverter
Part 5₁The stress when no load is applied will be reduced.

As described above, in this embodiment, each power supply device 3 ₁ , 3
_{Since the two} apply mutually high-frequency voltages to the power source input portion in a superimposed manner, there is an advantage that the outputs of the power source units 1 ₁ and 1 ₂ can complement each other, and at the same time, the stress of circuit operation at the time of abnormality can be absorbed. In this embodiment, in order to simplify the explanation, the inverter units 5 ₁ and 5 ₂ used for the power supply units 1 ₁ and 1 ₂ are the same series inverter type circuits as in the first embodiment, but this type of inverter is used. The circuit is not particularly limited.

Further, the method of returning the high frequency voltage to the power source input portion is not particularly limited to the method of this embodiment, either.
Any feedback means may be used as long as it can effectively achieve the purpose by superposing and applying to a plurality of feedback places such as the input side and the output side of each of the rectifier circuit units DB ₁ and DB ₂ . Further, the means for feeding back the high frequency voltage is not limited to the one constituted by winding the feedback winding N ₄ around the insulating transformers T ₂ and T ₂ 'as in the circuit of this embodiment, and the high frequency It suffices if the vibration element can return.

Furthermore, in the circuit of this embodiment, two power supply devices are provided.
Three₁Three₂It is a combination of, but in multiple cases
Has similar advantages. (Embodiment 3) In this embodiment, as shown in FIG.
₁Rectifier circuit DB₁Converted to DC pulsating voltage at
The DC pulsating voltage is applied to the first power supply unit 1₁Supply to this first
Power supply 1₁Power supply device 3 for converting into high frequency voltage by₁
And AC power supply AC₂Rectifier circuit DB₂DC pulsating current
Converted into a pressure, and the DC pulsating current voltage is converted into the second power supply unit 1₂To serve
Supply this second power supply 1₂Convert to high frequency voltage with
Load the high frequency voltage of 4 ₂Second power supply device for applying power to
Three₂And the first power supply unit 1₁More that high frequency voltage
The second power supply 3₂Rectifier circuit DB₂Before or after
The high-frequency superimposing section 2 provided is superposed and applied to the second power supply 3
₂It is intended to improve the distortion of the input current of.

That is, a high-frequency voltage for improving distortion of the input current of the second power supply device 3 ₂ is supplied from the high-frequency oscillator provided in the power supply section 1 ₁ of the first power supply device 3 ₁ to the second power supply device 3 ₂ . By superimposing and applying to the power input part of the power supply 1 ₂
It is obtained so as to improve the waveform distortion of the input current to the second power supply unit 3 ₂ without using a special circuit such as a feedback means from the self circuit.

FIG. 6 shows a specific circuit of this embodiment.
First power supply 3₁AC power supply AC ₁Choke L₄₁When
Capacitor C_TenA rectification circuit is provided via a filter circuit consisting of
Road DB₁And connect this rectifier circuit part DB₁To switch
Holding element Q₁Inverter section 5 consisting of₁And this i
Inverter section 5₁High frequency output of diode D₃Rectified by
And capacitor C₀AC-D with rectifying and smoothing part
First power supply unit 1 which constitutes a C converter₁Equipped with
It

In butter section 5₁Is an output transformer T₃of
Primary winding N_TenRectifier circuit part DB via₁Between the output ends of
Continued switching element Q₁Is driven by the control circuit 6.
Switching with a signal and output by that switching
Transformer T₃Secondary winding N ₂₀Generate a high frequency voltage
It has become so. More specifically, the switching element
Child Q₁’Is on, the current i₁Is an output transformer T₃
Primary winding N_TenTo the primary winding N_TenPower at both ends of
A voltage (+ at the end a, − at the end b) is generated, and the switching element
Child Q₁Turns off, the primary winding N_TenBack electromotive force (a end is
-, B end is +) and secondary winding N₂₀Also in the same polarity direction
Voltage (a at the a ′ end is − and at the b ′ end is +). This phone
Diode D by pressure₃Through the current i₂Flow,
Densa C ₀To charge. In this way the switching element
Child Q₁By repeating the on / off operation of '
Output a DC voltage between output terminals A and B,
Load 4 connected between A and B₁Power to
Becomes

The second power supply unit 3 ₂ has a rectifier circuit unit DB ₂ via the filter choke L ₄₂ and the high frequency superposition unit _2.
Connect, smoothing capacitor C to the rectifier circuit DB ₂
And _02, which are connected to constituted power supply unit 1 ₂ in the inverter section 5 _2. The high frequency superposition unit 2 is the first power supply unit 1 ₁
It is composed of a series circuit of a feedback winding N ₄₀ provided in the output transformer T ₃ of the inverter section 5 ₁ and a capacitor C ₈ and this series circuit is connected between the input terminals of the rectification circuit section DB _1. .

In this embodiment, however, the high-frequency voltage output from the inverter unit 5 ₁ of the power supply unit 1 ₁ of the first power supply unit 3 ₁ is applied to the input power source of the rectification circuit unit DB _{2 in} a superimposed manner, thereby The second power supply device 3 as in the first embodiment
The distortion of the input current of ₂ can be improved. Note the second power supply unit 3, _second, third, easy second at even connecting a plurality and so fourth first power supply apparatus 3 _first feedback means, third, fourth ... each power supply It is also possible to improve the distortion of the input current. Moreover, the number of returning means is not limited to one, and a plurality of returning means may be used.
It is possible to feed back to a plurality of places on either the input end side or the output end side of B ₂ .

[0043] Further the first power source unit 1 ₁ of the power supply device 3 ₁ A
Although it constitutes a C-DC converter, any circuit may be used as long as it includes a circuit that performs a high-frequency oscillation operation, and a circuit to which a load is connected or a circuit to which a load is not connected may be used. Further, the first power supply device 3 ₁ may be any device as long as it has a high-frequency output. For example, the loads of the second, third, ... Power supply devices are discharge lamps, and are installed on the floor of an office, for example. When constructing a system that turns on the discharge lamps collectively, as the equipment of the office,
When an air conditioner or its DC power supply device is installed, the high frequency output of the high frequency oscillation circuit incorporated in these devices or equipment is used to make these equipment or devices the first power supply system of the present invention. It may be used as _one power supply device 3 ₁ .

In the present embodiment as described above, of the plurality of power supply devices, a means for feeding back a high frequency voltage from _one power supply device 31 for generating a high frequency is provided, and another power supply device 3 is provided.
By superimposing and applying to the power input part of ₂ , it is easy to improve the distortion of the input current of the entire device with a small number of parts,
There is an advantage that it can be realized by a circuit configuration which is easy to cost.

(Embodiment 4) In this embodiment, as shown in FIG. 7, an AC power supply AC ₁ is converted into a DC pulsating voltage by a rectifying circuit unit DB _{1, and a} DC voltage is supplied via an active filter 7 which performs a high frequency switching operation. The voltage is supplied to the power supply unit 1 ₁ to be converted into a high frequency voltage, and the converted high frequency voltage is applied to the load 4 ₁
The first power supply device 3 ₁ for applying and supplying to the AC power supply AC ₂
Converted into direct current by the rectifier circuit DB _2, and converted into a high frequency voltage and supplies the DC pulsating voltage to the power supply unit 1 _2, the converted high frequency voltage applied to supply the second load 4 ₂ The power supply device 3 ₂ and the active filter 7 of the first power supply device 3 ₁ generate a high frequency voltage generated by the high frequency switching of the second power supply device 3 _{1 at} the power input part (input of the rectification circuit unit DB ₂ ). The high-frequency superimposing unit 2 provided on the end side or the output end side is superimposed and applied to the second power supply device 3
It is intended to improve the distortion of the input current of ₂ .

That is, the second power supply device 3₂Is the distortion of the input current
First power supply device 3 for improving ₁Acty like
Feedback from the high-frequency operating section of the self-circuit
It is characterized by not requiring a special circuit such as a stage. Figure
Reference numeral 8 denotes a specific circuit of this embodiment, which is the first power supply device.
Three₁AC power supply AC₁Rectifier circuit DB₁DC pulsating current
After converting to DC voltage, this DC ripple voltage is
The booster chopper circuit that composes the
Boost the input current to improve distortion and
The output DC voltage of the filter 7 is supplied to the power supply unit 1₁For smoothing
Indexer C₀₁This DC voltage is smoothed by
Data part 5₁Is converted to high frequency and the high frequency power is discharged.
Load 4 consisting of electric lights₁It is supplied to and turned on.

Second power supply device 3₂Is an active filter
AC power supply AC is used for the rectification circuit section DB without using a circuit₂Rectified by
After that, power supply 1₂Smoothing capacitor C₀₂
After smoothing with₂Change to high frequency
The converted high frequency voltage is converted into a load 4 which is a discharge lamp.
₂The light is applied and applied to. Above active file
The operation of the boost chopper circuit that composes the filter 7 is as follows.
is there. That is, the rectifier circuit DB₁Choke L between the output terminals of
_FiveSwitching element Q connected via_FourIs the control circuit 9
When turned on by the drive signal of₁+ Side output
From the end, choke L_Five, Switching element Q_FourThrough
Flow circuit DB₁To the-side output end of t shown in FIG.₁Ward
Flow in between, this t₁Chalk L in the section _FourMagnetic
Accumulate nergi.

Next, when the switching element Q ₄ is turned off,
The magnetic energy stored in the choke L ₅ is the diode D
₄ , the capacitor C ₀₁ and the rectifying circuit unit DB ₁ are discharged in the t ₂ section of FIG. 9A. The peak value I _{P of the} current flowing here is defined by I _P = (V _in / L) · T. [However, V _in is the input voltage (V _AC1 · sin ωt), V
_out is the output voltage, L is the inductance value of the choke L ₇ , and the on-time of the switching _C Q ₄ ] The switching element Q ₄ repeatedly turns on and off at a high frequency by an appropriate duty signal from the control circuit 8 to flow to the choke L ₇ . As shown in FIG. 9 (b), the current has a high-frequency current waveform I whose peak value I _P follows the power supply voltage | V _AC |, and the input current is passed through the filter circuit composed of the choke L ₈ and the capacitor C _5. The waveform of becomes a substantially sine wave.

The above-described active filter 7 is constructed.
The first power supply device 3 is operated by the operation of the pressure chopper circuit.₁Input
The current distortion will be improved. Also the first power supply device
Three₁Active filter 7 is a switching element Q_Fourof
The high frequency current generated by the high frequency switching
Black L_FiveSecondary winding L provided in ₅₂As high frequency voltage
Take out the second power supply device 3₂Return to high frequency superposition section 2
It is supposed to do. The high frequency superposition unit 2 is a second power source device.
Set 3₂Rectifier circuit DB₂Between the input terminals of the secondary winding L
₅₂Capacitor C₁₃Configured by connecting via
And the secondary winding L₅₂High-frequency voltage generated in the AC power supply voltage
It is designed to be applied in superimposition to.

[0050] so that the distortion of the second power supply device 3 and _second input current is improved by the superimposed application. Incidentally, L ₈ is a choke which constitutes a filter circuit. The second power supply device 3
Even if a plurality of _2's are connected to the third, the fourth, ..., Similarly, the feedback means from the first power supply device 3 ₁ (or the power supply device having the active filter 7 like the first power supply device 3 ₁ ) The distortion of the input current can be easily improved by the above, and the place to return is not limited to one place. It may be on either the input side or the output side of the rectifier circuit unit DB ₁ , or both of them may be returned to a plurality of places. good. Further, as long as it is a means for improving the input current most effectively, it is not limited to the configuration of this embodiment. The active filter 7 is not limited to the boost chopper circuit described above. Each inverter unit 5 ₁ , 5 ₂ may be of any type such as a half bridge type, push-pull type, or one-stone type, and each inverter unit 5 ₁ , 5 ₂ may be of the same type.
Different methods may be used.

In this embodiment, the active filter 7 is provided in at least one power supply device 3 ₁ of the plurality of power supply devices 3 ₁ , 3 _2.
The high frequency feedback means provided in the active filter 7 provided with a, to improve the distortion of the input current of the entire apparatus by superimposing a high frequency voltage obtained by the active filter 7 to the other power supply input portion of the power supply device 3 _2, It is possible to realize at a low cost with a simple circuit configuration having a small number of parts without separately providing a high-frequency generating power source, and since high-frequency feedback is performed from the active filter 7, the high-frequency supplying side is also supplied side. However, the input voltage frequency ripple does not appear in the output, and a stable output can be obtained in all devices.

(Embodiment 5) In this embodiment, as shown in FIG. 10, the AC power supply AC is converted into a DC pulsating voltage by the rectifier circuit DB, and the DC pulsating voltage is supplied to the first power supply ₁₁ . the first power supply unit 1 ₁ is supplied into a high frequency voltage, the first power supply unit 3 ₁ supplied to the load 4 ₁ a high frequency voltage, and the first power supply 3 ₁ of the AC power supply AC rectifier Circuit DB
Sharing the door, and converts the DC pulsating voltage to the second of the second high-frequency voltage by the power supply unit 1 ₂ is supplied to the power supply unit 1 _2, before the rectifier circuit DB by the feedback means and the high-frequency voltage or Applying a high-frequency voltage to the high-frequency superimposing section 2 provided later,
The distortion of the input current is improved.

FIG. 11 shows a specific circuit example of this embodiment. The inverter unit 5 ₁ of the power supply unit 1 ₁ provided in the first power supply unit 3 ₁ has two switching elements Q ₁ and Q _{2 formed} of bipolar transistors connected in series, and the switching elements Q ₁ and Q ₂ are connected to a control circuit. Of a known half-bridge type inverter circuit as shown in Japanese Patent Laid-Open No. 4-193066 which is alternately turned on and off by a circuit 9 and a series circuit composed of capacitors C ₂₀ and C ₂₁ connected in parallel to a smoothing capacitor C ₀₁ . and the load 4 ₁ discharge lamp between the connection point of the middle point and the switching elements Q _1, Q ₂ and a parallel circuit of a resonance capacitor C _23, a choke L ₂₀ constituting a resonance circuit with the capacitor C ₂₃ A series circuit of is connected, and oscillation is performed by resonance of the capacitor C ₂₃ and the choke L ₂₀ . In this embodiment, the distortion of the input current is improved by superimposing and applying from the midpoint of the capacitors C ₂₀ and C ₂₁ to the input end side of the rectifying circuit portion DB via the capacitor C ₂₄ .

Power supply unit 1 provided in the second power supply device 3 _2.
Inverter 5 _{2 2} includes a switching element Q ₅ connected in parallel via the parallel circuit of a resonance capacitor C ₂₅ to the smoothing capacitor C ₀₂ and the resonance choke L _21, for turning on and off the switching element Q ₅ It is composed of a one-stone inverter circuit including a control circuit 11, and a load 4 ₁ such as a discharge lamp is provided in parallel with a resonance choke L ₂₁ via a DC cutting capacitor C ₂₁ and a ballast choke L _22.
Is oscillated by parallel resonance of the resonance capacitor C ₂₅ and the resonance choke L _21, and the generated high frequency voltage is applied to the load 4 ₂ via the ballast choke L ₂₂ and the DC cut capacitor C ₂₁ . It is designed to be supplied.

This power supply unit 1₂The power supply for
Sensor C₀₂And the diode D_TenThrough D ₁₃Rectifier circuit consisting of
So that the DC pulsating voltage output from the section DB is smoothed
ing. Rectifier circuit DB is AC power supply AC choke L
_{twenty three}, Capacitor C₂₇A noise prevention filter circuit consisting of
The input end is connected via the
Source 1₁Capacitor C₂₀, C_{twenty one}The middle point is capacitor C
_{twenty four}Connected through.

According to the present embodiment configured as described above, since the rectifier circuit portion DB and the filter circuit can be shared by the power supply devices 3 ₁ and 3 ₂ , the number of circuit components can be reduced and the cost can be reduced. And the first power supply 3 ₁
Since the high frequency output of the power source section 1 ₁ is fed back to the power source input section to improve the distortion of the input current, it is necessary to provide a high frequency output feedback means in the power source section 1 ₂ of the _second power supply device 3 _2. without also output stable because no out the ripple component of the same frequency as the AC power source AC is obtained at the output of the power supply unit 1 _2.

In FIG. 11, D _{7 to} D ₉ are flyhole diodes. (Example 6) The present embodiment is also intended to be shared with Example 5 similarly to the first power supply unit 3 ₁ a filter circuit for preventing noise rectifier circuit DB second power supply 3 _2, The circuits of the inverter units 5 ₁ and 5 ₂ of the respective power supply units 1 ₁ and 1 ₂ are shown in FIG.
2 is different from the fifth embodiment.

That is, in this embodiment, the first power supply 3₁
Power supply 1₁Inverter section 5 installed in₁In Example 5
Second power supply device 3₂Power supply 1₂Inverter part
5₂While using the same one-stone inverter circuit,
This inverter part 5₁Resonance choke L_{twenty two}To
Secondary winding L_{twenty two}′ Is wound and high frequency voltage is applied to the power input
Of the high frequency provided between the output terminals of the rectification circuit unit DB that constitutes the
DC cut capacitor C in the wave superposition section 2_{twenty four}Through '
I am going to return it. The power supply unit 1 of the fifth embodiment ₂Same as
Circuit elements that have a role are assigned the same numbers and explanations are omitted.
It

On the other hand, the inverter section 5 ₂ of the power supply section 1 ₂ of the second power supply apparatus 3 ₂ employs the serial inverter circuit of the first and second embodiments. In the illustrated example, the upper switching element Q _{1 is used.} the bipolar transistor is, the use of a MOSFET in a switching element Q ₂ of the lower on-off control the first embodiment of the switching element Q _1, example 2
Similarly to the above, the self-excitation control is performed, and the on / off control of the switching element Q _{2 is} performed by the separate excitation control by the control circuit 11. The resonance operation between the resonance capacitor C ₄ and the inductance component of the primary winding n ₁ of the feedback transformer T ₁ is substantially the same as that of the first and second embodiments.
The output control to the load 4 ₂ can be easily performed by performing the separate excitation control. The second power supply unit 3 ₂ of the power supply unit 1 ₂
The smoothing capacitor C _{02 serving} as the power source for the first power supply device 3
Because it is connected in parallel to the _first power supply unit 1 ₁ of the rectifier circuit portion DB, just like the rectifier circuit DB as in Example 5
And the filter circuit can be shared, the circuit parts can be reduced and the cost can be reduced. Further, the high frequency voltage of the power supply section 1 ₁ of the first power supply device 3 ₁ is fed back to the power supply input portion to input current. since the distortion is improved, the power supply unit 1 ₂ of the second power supply unit 3 ₂ there is no need to provide a feedback means of the high frequency voltage and the output of the power supply unit 1 ₂ at the same frequency as the AC power supply AC A stable output can be obtained because no ripple component appears.

[0060] (Embodiment 7) This embodiment includes a filter circuit for the first power supply 3 ₁ noise prevention as in Example 5, 6 and the rectifier circuit portion DB of the second power supply unit 3 ₂ shared However, the circuits of the inverter units 5 ₁ and 5 ₂ of the respective power supply units 1 ₁ and 1 ₂ are different from those of the fifth and sixth embodiments shown in FIG. 13, and the place for feeding back the high frequency output is also different.

That is, in this embodiment, the inverter units 5 ₁ , 5 of the power supply units 1 ₁ , 1 ₂ of the first and _second power supply units 3 ₁ , 3 _2.
2 uses an inverter circuit having a configuration basically common to that of the serial inverter type inverter circuit shown in FIG. 2 of the first embodiment. The inverter unit 5 ₁ of this embodiment,
5 ₂ is a control circuit 1 for switching elements Q ₁ and Q _{2 respectively.}
External excitation control for turning on / off by 3 ₁ and 13 ₂ is performed, and the resonance voltage of the resonance capacitor C ₄ provided in each is supplied to the loads 4 ₁ and 4 ₂ .

The first power supply device 3₁Power supply 1₁Together
Swing choke T₁'And a resonance capacitor C_FourConnection with
DC cutting capacitor C at point a_FiveRectifier circuit section via
Connect the output side of the positive electrode of DB to adjust the high frequency voltage at point a.
It is applied to the pulsating current voltage behind the flow circuit part DB,
If the wave voltage is lower than the DC pulsating current voltage after DB,
SA C_{twenty four}'' Is charged, and half a cycle later, high frequency voltage +
Capacitor C_{twenty four}'' Charging voltage is smoothing capacitor C₀₁
(C₀₂) Voltage is exceeded, diode D₂₀(D _{twenty one})
Capacitors C₀₁(C₀₂) To charge
Has become.

According to this embodiment, the input current is
Barter section 5₁Chopping current flows at high frequency
And the current is choke L₂And capacitor C₆And fi
The voltage of the AC power supply AC is brought into the same phase by the filter circuit. Servant
Therefore, in this embodiment, the first power supply 3₁Power supply 1
₁2nd power supply device 3 by feedback from₂Input current distortion
The second power supply device 3 can be improved.₂Power supply 1₂To
Does not require any means to improve the input distortion. Also the first
Source device 3₁Power supply 1₁AC power for feedback to the output of
The same ripple as the frequency of AC appears, but the second power supply
Three₂Power supply 1 ₂A stable output can be obtained. Further
In this embodiment, as in the first embodiment, the transformer is used as the feedback means.
Su T₂Need not be provided.

[0064] Note that although the embodiment 5 to Example 7 was achieved, the first rectifier circuit DB and the filter circuit of the power supply device 3 ₁ second power supply unit 3 ₂ share, one rectifying circuit portion D
In a plurality of power supply devices sharing B, the high-frequency feedback means provided in the power supply unit of at least one power supply device may superimpose and apply a high-frequency voltage before or after the rectifier circuit unit DB, and particularly two power supply devices 3 ₁ , not limited to three _2. Further, the circuit system of the inverter units 5 ₁ and 5 ₂ of the power supply units 1 ₁ and 1 ₂ is not particularly limited to the above system. Further, the number of feedback means for returning the high frequency output from one power supply unit is not limited to one, and the feedback place is not limited to the input end side and the output end side of the rectifier circuit unit DB. It may be a means of returning.

(Embodiment 8) In this embodiment, as shown in FIG. 14, the AC power supply AC is converted into a DC pulsating voltage by the rectifier circuit DB, and the DC voltage is supplied to the first power supply ₁₁ . The first power supply device 3 ₁ that supplies the high-frequency voltage to the load 4 ₁ to convert the high-frequency voltage to the load 4 ₁ , and the AC power supply AC of the first power supply device 3 ₁ and the rectifier circuit DB are shared, and The DC pulsating current output voltage is supplied to the _first power supply unit 1 ₁ to be converted into a high frequency, and the high frequency voltage is supplied to the load 4 ₁ and the second power supply unit 3 ₂ is provided. Power supply 3 ₁ 3 ₂
The high frequency outputs of the power supply units 1 ₁ and 1 ₂ are superposed on the high frequency superposition unit 2 provided at the input end and the output end of the rectifier circuit unit DB by the feedback means to improve the distortion of the input current.

FIG. 15 shows a specific circuit of this embodiment, which is the inverter section 5 of the power supply section 1 ₁ of the first power supply apparatus 3 _1.
1 , switching elements Q ₁₀ and Q ₁₁ , resonance capacitor C
₄ 0, starting resistor R _10, R _11, and an output transformer T ₁₀ L-using the inverter circuit of the push-pull DC-cut from the feedback winding N ₁₅ that is turning the output transformer T ₁₀ wound DB for rectifying circuit via capacitor C ₂₈
The high frequency output is fed back to the output end side of.

On the other hand, the inverter section 5 of the _second power supply device 3 _2
2 uses an inverter circuit of a separately-excited series inverter system similar to the inverter unit 5 _{2 of the} seventh embodiment, and is wound on an output transformer T _{2 in} which a primary winding N ₁ is connected in parallel to a resonance capacitor C ₄ . The high frequency output is fed back from the turned feedback winding N ₄ to the input end side of the rectifier circuit portion DB via the DC cutting capacitor C ₂₉ .

The rectifier circuit portion DB includes diodes D _{10 to} D _13.
By a diode bridge, the diodes D ₁₂ of them through the DC blocking capacitor C ₂₈ constitute a first high-frequency superimposing means connected in parallel to the feedback winding N _15, the diode D ₁₀ The feedback winding N ₄ is connected in parallel via the DC cut capacitor C ₂₉ to form a second high frequency superimposing means.

[0069] There are thus superimposed is applied to the power supply unit 1 _1, 1 ₂ of the high-frequency voltage to the power input portion by the high-frequency superimposing unit 2 consisting of two high frequency superimposing means, provided in each power supply unit 1 _1, 1 ₂ The smoothing capacitors C ₀₁ and C ₀₂ are charged. Then, capacitors C ₀₁ and C charged by the high frequency voltage superimposed by the two high frequency superimposing means.
Distortion of the input current is improved by balancing the charge amount of _{02 with} the consumed power.

[0070] By doing so, the load is connected to the power supply unit 1 _1, 1 _2, respectively 4 _1, 4 ₂ is a discharge lamp, if anything better of the discharge lamp is extinguished by any cause like If, for example, the first loading of the power supply 3 ₁ of the power supply unit 1 ₁ 4 ₁
If barrel discharge lamp is removed, the inverter unit _{5. 1} for L- push-pull method, when the load 4 ₁ is removed, the output voltage of the output transformer T ₁₀ is increased, the output transformer T ₁₀ Since the circuit has a constant current characteristic due to the choke L ₂₄ connected between the center tap of the primary winding N ₁₀ and the smoothing capacitor C ₀₁ which is the power supply, the feedback winding of the output transistor T ₂ The supply of electric power does not change even if the high frequency voltage generated in N ₁₅ rises. Therefore, the high frequency feedback power from the first power supply unit 1 ₁ does not change and the load decreases, so
The charging voltage of the smoothing capacitors C ₀₁ and C ₀₂ is increased, the resonance of the resonance capacitor C ₄ and the resonance choke T ₁ ′ of the inverter unit 5 ₂ of the second power supply unit 1 ₂ is strengthened, and the second power source is light output parts 1 ₂ load 4 ₂ barrel discharge lamp is increased, it is possible to compensate for the decrease in light output.

Further, in the present embodiment, the respective power supply units 1 ₁ , 1
_Since the high frequency feedback means is provided in ₂ , the improvement of the distortion of the input current of oneself is eventually improved by the high frequency feedback of the oneself. For example, in the case of the second power supply unit 1 ₂ , the load 4
_When the discharge lamp of No. 2 is removed, the control circuit 13 detects this no-load state and detects the inverter unit 5 of the _second power supply unit 1 _2.
It is designed to stop the oscillation of ₂ and the feedback winding N
Frequency output for the feedback does not occur in _4. For that reason eventually improve the distortion of the input current at a high frequency feedback power component of the first power source unit 1 _1, the high-frequency feedback power and capacitor C _01, C
_{Balanced with} the charge of ₀₂ , distortion can be improved without changing the input current waveform. This is because if the first power supply unit 1 ₁ has a means for stopping the oscillation of the inverter unit 5 ₁ when there is no load, the load 4 _{1 is} released in the first power supply unit 3 ₁ as well as the _second power supply unit 1 _2. The light output of the electric lamp can be increased to compensate for the decrease in the light output.

[0072] Thus or Tsu complementary light output depending on the circuit configuration of each power supply unit 1 _1, 1 _2, be removed load can be improved without distortion of the input current varies. This can be said not only in the case where the two power supply devices 3 ₁ and 3 ₂ are provided, but also in the case where a plurality of power supply devices are provided. The circuit system of the inverter units 5 ₁ and 5 ₂ forming the power supply units 1 ₁ and 1 ₂ is not particularly limited to this embodiment, and the diodes D _{10 to} D ₁₃ forming the rectifier circuit unit DB are not limited to this embodiment. Feedback windings N in parallel with different diodes D ₁₀ and D _12
4 and N ₁₅ are connected in parallel via DC cut capacitors C ₂₈ and C _{29 so} that the high frequency output is superimposed on the input end side and the output end side of the rectifier circuit unit DB. The configuration is not limited to the example, and any place can be used as long as it can improve the input current distortion by applying the high frequency voltage superimposition from the inverter units 5 ₁ and 5 ₂ . Further, the number of high-frequency feedback means is not limited to one from one power source section, and it is sufficient that the distortion of the input current can be effectively improved by using a plurality of high-frequency feedback means.

(Embodiment 9) This embodiment is different from Embodiment 8.
First and second power supply device 3₁, 3₂Power supply 1₁1₂
Inverter part 5₁5,₂High frequency output of the power input part
16 is similar in that it is returned to
Each inverter part 5₁5,₂Inver of Example 7
Part 5₂In the same way as the serial type inverter type circuit
Use each inverter unit 5₁, 5₂Resonance capacitor C
_FourPrimary winding N₁Output transformer T connected in parallel₂To
A transformer T for each output, provided separately.₂Return winding
Line N _FourAnd these feedback windings N_FourBecause of each
Inverter section 5₁5,₂The high frequency voltage of the
Densa C₂₈, C₂₉Through the output side of the rectifier circuit DB
It is designed to be applied in superimposition to.

Here, the high frequency superimposing section 2 is the first power supply device.
Three₁Power supply 1₁Choke L by feedback from_{twenty five}, DC
Cutting capacitor C₂₈Resonant circuit and diode D₂₀When
First high frequency superimposing means and second power supply device 3₂Power supply
Part 1₂Choke L by feedback from₂₆, DC cutting
Indexer C₂₉Resonant circuit and diode D_{twenty one}Second high with
Frequency superposition means and these two high frequency superposition
Rectifier circuit section D including high frequency output superimposed by the circuit
A smoothing capacitor C depending on the output voltage of B₀₁, C ₀₂Charge the
And these capacitors C₀₁, C₀₂But
Each power supply 1₁, 1₂Constitutes the power supply of.

[0075] Here, the first power supply 3 ₁ of the power supply unit 1 ₁
The oscillation frequency of the inverter unit 5 ₁ a f _1, a second power supply device 3 ₂ of the inverter section 5 _second oscillation frequency of the power supply unit 1 ₂ and f _2, also f ₀ the LC resonance frequency of each high frequency superimposing means [= 1 / (2π√L ₂₅ C ₂₈ ) = 1 / (2π√L ₂₆
C ₂₉ )] and the resonance frequency f ₀ and each oscillation frequency f ₁ f
The relationship with ₂ is set as shown in FIG. When the loads 4 ₁ and 4 ₂ to be connected to the invar sections 5 ₁ and 5 ₂ are preheating type discharge lamps, a preheating winding is provided to preheat the filament of the discharge lamp when the power is turned on. The method of improving the starting is often used, and as the control of the inverter units 5 ₁ and 5 ₂ at that time, it is general to set the oscillation frequency to be higher than that at the time of lighting. Further, when the load of the discharge lamp is removed, the oscillation frequency generally approaches the resonance point of the inverter units 5 ₁ , 5 ₂ and decreases.

Therefore, the inversion between the preheating and the no-load is performed.
Data part 5₁5,₂The oscillation frequency of the
F₁’, F₁″, F₂’, F₂‘’ Resonance
Point f ₀As it gets closer to capacitor C₂₈, C₂₉Applied to
The voltage applied to the battery increases and the amount of charge increases. high frequency
In the superposition unit 2, each inverter unit 5₁5,₂Point of
Oscillation frequency f during lighting₁, F₂At that time, that is, in FIG.
P₁, P₂Capacitor C at each point of₆₀, C₆₁Voltage
And diode D₆₀, D₆₁When turning on and charging
Is set so that the input current distortion is improved well.
In the case of preceding preheating and no load etc. mentioned above
The oscillation frequency is set symmetrically as shown in Fig.17.
If so, each inverter unit 5₁5,₂Circuit
When the operation mode such as heat or no load is entered,
Since the oscillation frequency shifts as shown in Fig. 17,
Inverter section 5₁5,₂Operation is in the preheating mode.
C, the resonance operation of each high frequency superposition circuit₂₈, C
₂₉The voltage applied to₂₈Is P₂’、 C₂₉Is P₁’
It becomes the voltage, and the capacitor C₂₉Smoothing capacitor C
₀₁, C₀₂The amount of charge to the₂₈To
Since the amount to be charged is reduced, P₁Point, P₂Dot of
Preliminary preheating without significant change in charge amount due to voltage
, A good input current waveform can be obtained and
Densa C₀₁, C₀₂There is no problem such as abnormal boosting
Similarly, even when there is no load, the oscillation frequency is as shown in the figure.
The same can be said by moving to. Here is actually the precedence
During preheating or no load, feedback winding N_FourApplied to
Voltage increases, but due to the effects explained above,
Densa C₀₁, C₀₂Problem of abnormal voltage boosting
Disappears.

(Embodiment 10) This embodiment is shown in FIG.
Sea urchin first power supply unit 1₁, The second power supply unit 1₂High frequency from
The voltage is applied separately after and before the rectification circuit unit DB.
This is different from Example 9 in the point that it was made. Also
Power supply 1₁1₂Inverter part 5₁5,₂Is Example 9
Different from the case of, the oscillation frequency is
It is designed to operate at the same wave number and the same phase. And
Each power supply 1₁1₂Each output transformer T₂Secondary
Winding N₂High frequency voltage of the same phase is output to
Become. Output transformer T here₂Feedback winding N_FourFrom
The generated voltage is V in Figure 19₁, V ₂Occurs in a phase like
Then, the diode D₂₀Direction to turn on, that is, the arrow in the figure
Capacitor C in the direction of₀₁, C₀₂The voltage to charge the battery is shown in Fig. 20.
As shown in, the high-frequency half-waves are added and the wave
High-value high waveform, feedback winding N_FourIs somebody
Capacitor C compared to the case₀₁, C₀₂Charging voltage is too high
(The shaded area in Fig. 20 is the capacitor.
C₀₁, C₀₂Shows the voltage to flow the charging current to, V in the figure_ACExchange
Current source AC, V_DCIs the diode D₂₀Turns on
Show bell). In other words, if the AC power supply AC voltage is low,
Inverter section 5₁5,₂In terms of efficiency, the inverter unit 5
₁5,₂It is effective when you want to use the high power supply voltage of
is there. If either one of the discharge lamps is a load 4₁Or
Four₂Is removed and the corresponding output transformer T₂Output power
When the pressure rises abnormally, the amount of feedback also rises, but
Discharge lamp load 4₁Or 4₂The light output of
Therefore, the optical outputs themselves become complementary operations.

As described above, in this embodiment, the power supply units 1 ₁ , 1
₂ is effective when used by increasing the step-up ratio of the input voltage, and when compensating for the optical output as described above, and when any power supply unit stops oscillation due to no load, Another advantage is that the distortion of the input current can be improved by another power supply unit. Note the output transformer T ₂ is provided with a preheating winding N _5, N ₆ of the preheating type discharge lamp serving loads 4 _1, 4 _2.

(Embodiment 11) This embodiment is shown in FIG.
So the first power supply 3₁And second, third ...
Three₂Three₃, And the first power supply device 3₁
Is the rectifier circuit unit DB₁And smoothing capacitor C₀₁And Inn
Barter section 5₁Power supply unit 1 consisting of₁And consists of
Barter section 5₁Has a load of 4₁Connect. On the other hand, second and third
Power supply 3 of₂Three₃... is the rectifier circuit section DB₁, DB
₂... and the DC-DC converter circuit 20₁… And smooth
Indexer C₀₂, C₀₃... and the inverter unit 5₂, 5₃…When
Power supply unit 1₂1₃… And each invar
Data part 5₂, 5₃Load on ... ₂Four₃I connected ...
Therefore, the DC-DC converter circuit 20₁, 20₂By ...
The distortion of each input current is improved.

[0080] Then, by superimposing applied by the high frequency superimposing part 2 provided with the respective inverter section 5 _2, 5 ₃ ... high frequency output of the first before or after the power supply device 3 ₁ of the rectifier circuit DB _1, the first It adapted to improve the distortion of the power supply device 3 of the _input current. FIG. 22 shows a specific circuit of this embodiment. The DC-DC converter circuits 20 ₁ , 20 ₂ ... Of the power supply devices 3 ₂ , 3 ₃ ... Are a known booster composed of a choke La, a switching element Qa and a diode Da. Control circuits 12 ₁ and 12 configured by a chopper circuit for controlling on / off of the switching elements Q ₁ and Q ₂ of the inverter unit 5 ₂ .
_The switching element Qa is switched by the drive signal from ₂ ...

Each of the inverter units 5 ₂ , 5 ₃ ... Is composed of a serial type inverter circuit, and is basically a circuit of the separately-excited control serial inverter type, which is the same as the inverter unit 5 ₂ used in the seventh embodiment. Each inverter section 5 ₂ , 5
_The feedback windings N ₄ wound around the output transformers T ₂₁ and T ₂₂ provided in ₃ ... Capacitors C ₃₁ and C between the output terminals of the rectifier circuit portion DB ₁ of the first power supply device 3 _{1. 32} are connected to form a high frequency feedback circuit and a high frequency superposition section 2.

The choke L ₃₀ and the capacitor C _{31 form} a filter circuit. In the present embodiment having the above-described configuration, the second, third ... Power supply devices 3 ₂ , 3 ₃ ... Are shared and each high frequency voltage is fed back to the power supply input part of the _first power supply device 3 _1. Therefore, since the distortion of the input current of the first power supply device 3 ₁ is improved, the first power supply device 3 1
_{When the} load 4 ₁ connected to ₁ has a very large capacity, and the load output must not undergo fluctuations in the ripple of the frequency of the AC power supply AC, and a stable output is required, each power supply device 3 ₂ , 3 The distortion of the input current of the _first power supply device 3 ₁ can be improved while reducing the load on the output of ₃ ...

(Embodiment 12) As shown in FIG. 23, this embodiment is equipped with a plurality of first power supply devices 3 ₁₁ ... Which share the rectifier circuit unit DB ₁ and the smoothing capacitor C _0. but different from the 10, likewise superimposed applying a high frequency output to the high-frequency superimposing unit 2 before or after the rectifier circuit portion DB from another power supply device 3 ₂ ... of the inverter section 5 ₂ ... as in example 10, the The input current distortion of the power supply device 3 _{11 of} 1 is improved.

Therefore, in the first power supply device 3 ₁₁ ... The DC pulsating current voltage outputted from the rectifier circuit DB ₁ and having the high frequency output superimposed thereon is smoothed by the smoothing capacitor C ₀ , and the smoothed DC power is supplied. As a result, the inverter units 5 ₁₁ of each power supply unit ₁₁ operate to convert to high frequencies and apply the high frequencies to the respective loads 4 ₁₁ . The configuration of the second, third, ... Power supply devices 3 ₂ , 3 _3, ... Is the same as that of the eleventh embodiment, and since its specific circuit is also the same as that of the eleventh embodiment, its description and illustration are omitted.

In the present embodiment configured as described above, in addition to the advantages of the eleventh embodiment, a plurality of first power supply devices 3 ₁₁ ...
The input current distortion can be improved at once.

[0086]

According to the first aspect of the present invention, there is provided a first power supply device having means for generating a high frequency voltage, a rectifying circuit unit connected to an AC power source for converting an AC voltage into a DC voltage, and connected to the rectifying circuit unit. A smoothing capacitor that smoothes the DC voltage,
A second power supply device configured to include an inverter unit that converts a DC voltage into a high frequency voltage by using the smoothing capacitor as a power supply, and the first power supply device has a first power supply input portion in front of the smoothing capacitor. Since at least a high-frequency superimposing means for superimposing and applying the high-frequency voltage of the power supply device is provided, a rectifier circuit section and an inverter section using a direct current obtained by rectifying and smoothing an AC power source by a smoothing capacitor as a power source are provided. The input current distortion of the power supply device can be improved with a circuit that has a small number of parts, has a simple configuration, and is inexpensive, and since the feedback circuit is not provided in the self circuit, the high frequency output of the second power supply device There is an effect that it can be made stable without including a ripple component.

According to the second aspect of the present invention, the high frequency voltage of the second power supply device is superimposed and applied to the power supply input portion of the first power supply device. Even if the output is increased, the stress of the second power supply device can be reduced by superimposing it on the first power supply device side. The invention of claim 3 is the first
Is a rectifier circuit unit that converts the AC voltage of the AC power supply into a DC voltage, a smoothing capacitor that is connected to the rectifier circuit unit and that smooths the DC voltage, and a DC voltage into a high-frequency voltage using the smoothing capacitor as a power supply. Since the high-frequency voltage of the second power supply device is superimposed and applied to the power supply input portion before the smoothing capacitor, the first and second inverters are provided.
The improvement of the distortion of the input current of the power supply device can be improved by the mutual application of the high frequency voltage, and the output of the inverter part of both power supply devices can be complemented, and the stress of the inverter part of both power supply devices can be reduced when there is no load. There is an effect that can be achieved.

According to the fourth aspect of the present invention, since both power supply devices are connected to the same AC power source while sharing the rectifying circuit section of the first and second power supply devices, the circuit is simplified and the cost is reduced by sharing the circuit. There is an effect that can be achieved. According to the invention of claim 5, the plurality of first power supply devices are provided, and the high-frequency voltage is applied from at least one of the first power supply devices to the power supply input portion of the second power supply device in front of the smoothing capacitor. An effect that it is possible to realize a power supply system capable of reducing the influence on the high-frequency output of the first power supply device that superimposes and applies the high-frequency voltage to the second power supply device even when the load capacity of the second power supply device is large. There is. The invention of claim 6 is
Since a plurality of first power supply devices and a plurality of second power supply devices are provided, and the high frequency voltage of the first power supply device is superimposed and applied to the power supply input portion of the second power supply device before the smoothing capacitor. Therefore, there is an effect that it is possible to realize a power supply system that can collectively improve the distortion of the input current of the plurality of second power supply devices.

According to a seventh aspect of the present invention, in the first aspect of the invention, a chopper circuit is provided in the first power supply device, and a high frequency voltage generated by the chopper circuit is supplied to a power source before the smoothing capacitor of the second power supply device. Since it is applied superimposed on the site,
The input current distortion of the second power supply device can be improved by a circuit that has a small number of parts, has a simple configuration, and is inexpensive, and since a feedback circuit is not provided in its own circuit, the high-frequency output of the second power supply device is an AC power supply There is an effect that it can be made stable without including the frequency ripple component.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a first embodiment.

FIG. 2 is a specific circuit diagram of the above.

FIG. 3 is a circuit block diagram of a second embodiment.

FIG. 4 is a specific circuit diagram of the above.

FIG. 5 is a circuit block diagram of a third embodiment.

FIG. 6 is a specific circuit diagram of the above.

FIG. 7 is a circuit block diagram of a fourth embodiment.

FIG. 8 is a specific circuit diagram of the above.

FIG. 9 is a waveform diagram for explaining the operation of the above.

FIG. 10 is a circuit block diagram of a fifth embodiment.

FIG. 11 is a specific circuit diagram of the above.

FIG. 12 is a specific circuit diagram of the sixth embodiment.

FIG. 13 is a specific circuit diagram of the seventh embodiment.

FIG. 14 is a circuit block diagram of an eighth embodiment.

FIG. 15 is a specific circuit diagram of the above.

FIG. 16 is a specific circuit diagram of the ninth embodiment.

FIG. 17 is an explanatory diagram of the same operation as above.

FIG. 18 is a specific circuit diagram of the tenth embodiment.

FIG. 19 is an operation explanatory diagram of the above.

FIG. 20 is a waveform diagram for explaining the same operation as above.

FIG. 21 is a circuit block diagram of an eleventh embodiment.

FIG. 22 is a specific circuit diagram of the above.

FIG. 23 is a circuit block diagram of a twelfth embodiment.

[Explanation of symbols]

1 ₁ 1st power supply part 1 ₂ 2nd power supply part 2 High frequency superposition part 3 ₁ 1st power supply device 3 ₂ 2nd power supply device 4 ₁ , 4 ₂ load AC ₁ , AC ₂ AC power supply

Continuation of front page (72) Inventor Kenichi Sachi 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.

Claims (7)

[Claims] 1. A first power supply device having means for generating a high frequency voltage, a rectifier circuit section connected to an AC power source for converting an AC voltage into a DC voltage, and a smoothing circuit connected to the rectifier circuit section for smoothing the DC voltage. Power supply input before the smoothing capacitor of the second power supply device, the second power supply device including a power supply capacitor and an inverter unit that converts a DC voltage into a high frequency voltage using the smoothing capacitor as a power supply. A power supply system comprising at least a high-frequency superimposing means for superimposing and applying the high-frequency voltage of the first power supply device to the part. 2. The power supply system according to claim 1, wherein the high frequency voltage of the second power supply device is superimposed and applied to the power supply input portion of the first power supply device. 3. The first power supply device comprises a rectifier circuit section for converting an AC voltage of an AC power supply into a DC voltage, a smoothing capacitor connected to the rectifier circuit section for smoothing the DC voltage, and a DC for the smoothing capacitor as a power source. The power supply system according to claim 1, further comprising: an inverter unit that converts the voltage into a high-frequency voltage, wherein the high-frequency voltage of the second power supply device is superimposed and applied to a power supply input portion before the smoothing capacitor. 4. The power supply system according to claim 3, wherein both power supply devices are connected to the same AC power supply while sharing the rectifying circuit section of the first and second power supply devices. 5. A plurality of first power supply devices are provided, and a high-frequency voltage from at least one of the first power supply devices is superimposed and applied to a power supply input portion of the second power supply device before the smoothing capacitor. The power supply system according to claim 1. 6. A plurality of first power supply devices and a plurality of second power supply devices are provided, and the high frequency voltage of the first power supply device is provided at a power supply input portion before the smoothing capacitors of these second power supply devices. 2. The power supply system according to claim 1, wherein the voltage is superimposed and applied. 7. The first power supply device is provided with a chopper circuit, and a high frequency voltage generated by the chopper circuit is superimposed and applied to a power supply portion of the second power supply device before the smoothing capacitor. 1. The power supply system according to 1.