JPH07230890A - Electric power supply device - Google Patents

Abstract

PURPOSE:To dispense with an inductor and a resonance capacitor, and downsize constitution by connecting a series circuit of two switching elements in parallel to DC electric power supply, and joining a necessary voltage variable means to this switching circuit. CONSTITUTION:A series circuit of switching elements S1 and S2 is connected in parallel to DC electric power supply E, and a voltage converting means such as a Cockcroft-Walton circuit formed of capacitors and diodes C1 and D1 to C5 and D5 is connected to this switching circuit. The respective elements S1 and S2 are alternately controlled through a control circuit 1 in an ON and OFF system, and capacitors C1 to C5 are charged and discharged in order with electricity, and boosting voltage converted in a high frequency is supplied to a load 2 with small constitution in which an inductor and a large resonance capacitor can be dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying a high frequency current to a load by a high frequency switching operation.

[0002]

2. Description of the Related Art FIG. 20 is a circuit diagram of a conventional power supply device. This power supply device is composed of a half-bridge type inverter circuit. The switching elements S ₁ and S ₂ are connected in series to the DC power source E, and the switching element S ₂
A series circuit of a resonance inductor L, a DC voltage cut capacitor C ₁ and a parallel circuit of a load 2 and a resonance capacitor C ₂ is connected in parallel with the above. The switching elements S ₁ and S ₂ are controlled by a control signal from the control circuit 1 so as to be alternately turned on / off.

FIG. 21 is an operation waveform diagram of the circuit. The specific circuit operation will be described below. Switching element S
_As shown in FIGS. 21A and 21B, ₁ and S ₂ alternately perform on / off operations. Inductor L, capacitor C
_When the operating frequency of the switching elements S ₁ and S ₂ is set higher than the resonance frequency of the load circuit composed of ₁ and C ₂ and the load 2, the switching element S ₁ is turned on and the switching element S ₂ is turned off at time t _0. When switching element S ₁
Due to resonance, the current starts from the negative direction and eventually becomes a positive current. The current Iz of the inductor L is as shown in FIG.
Flows like. At time t ₁ , switching element S ₁ is turned off and switching element S ₂ is turned on. Inductor L
Current Iz of the switching element S ₂ tries to continue flowing,
Flows in the opposite direction and then in the positive direction. The switching element S ₁ is turned on again at the time t ₂ , and a high-frequency current can be supplied to the load 2 by the series of operations. However, in the conventional example, the inductor L is used for power conversion.
In addition, since the capacitor C ₂ also handles a considerably large current due to resonance, large parts are required, and there is a problem that the device becomes large.

[0004]

As described above, in the conventional power supply device, the inductor is used for power conversion, and the capacitor handles a considerably large current due to resonance, so that a large component is required. There was a problem that the device became large. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a small-sized compact without requiring an inductor for power conversion and a capacitor for resonance. An object of the present invention is to provide a power supply device capable of supplying power with the device.

[0005]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG. 1, first and second switching elements S ₁ , S
_Two series circuits are connected, and at least one capacitor and a switching element are provided between both ends of one switching element S ₂ , and the first and second switching elements S ₁ and S _{2 are connected.}
A voltage variable means such as a Cockcroft-Walton circuit that generates a voltage by the on / off operation of the
Is connected to at least one output of the voltage varying means.

[0006]

According to the structure of the present invention, the voltage of the DC power supply is changed by using the capacitor and the switching element like the Cockcroft-Walton circuit without using the inductor for the power conversion circuit and the capacitor for resonance. Since the voltage variable means capable of boosting is used, by setting the operating frequency of the switching element to a high frequency, sufficient boosting action can be obtained even with a small capacitor, and the power supply device can be reduced in size and weight. Is.

[0007]

1 is a circuit diagram of a first embodiment of the present invention.
The basic configuration of the main circuit of this embodiment will be described.
Is connected in parallel with a series circuit of switching elements S ₁ and S ₂ , a multiplication circuit X is connected in parallel with the switching element S _2, and a load 2 is connected to the output of the multiplication circuit X.
The multiplier circuit X is a circuit that can generate a high voltage from the DC power source E by alternately turning on / off the switching elements S ₁ and S ₂ , and uses a so-called Cockcroft-Walton circuit.

The operation of the multiplication circuit X will be described below. The switching elements S ₁ and S ₂ are alternately turned on and off.
When the switching element S ₁ is turned on by the control signal from the control circuit 1, the capacitor C ₁ is charged to the voltage E via the diode D ₁ . Next, when the switching element S ₁ is turned off and the switching element S ₂ is turned on, the capacitors C ₁ and C ₂ are connected via the diode D _2, and a part of the charge of the capacitor C ₁ moves to the capacitor C _2. , The capacitor C ₂ is charged. Again, switching element S ₂
When the switching element S ₁ is turned off and the switching element S ₁ is turned on, the capacitor C ₁ is charged to the voltage E through the diode D _1, and a part of the electric charge of the capacitor C ₂ moves to the capacitor C ₃ through the diode D ₃ , The capacitor C ₃ is charged. By repeating this, the capacitors C _{1 to} C ₅ are charged, and the maximum voltage is charged to the voltage E for each capacitor. In this way, it is possible to apply a maximum voltage of 3E to the load 2. Further, even if one end (point A) of the load 2 is connected to the positive electrode side of the power source E, a maximum voltage of 3E can be applied, and if connected to the negative electrode side of the power source E, a maximum of 4E can be applied.
Can be applied.

Further, the charge transfer between the capacitors is not performed unless the switching element operates. In this case,
The electric charge of each capacitor is discharged to the load 2 via each diode. This causes the voltage of the load 2 to decrease. Therefore, by repeating the operation of the switching element, that is, by controlling the operating frequency, the voltage V of the load 2 is reduced.
It becomes possible to control ₃ .

FIG. 2 shows an operation waveform diagram of this embodiment. this
2 is a circuit diagram of the switching element S using the circuit of FIG.₁，
S₂To supply the load 2 with a substantially half-wave waveform by controlling the
Shows the work. Time t₀And the switching element S₁But
When turned on by the control signal from the control circuit 1, the capacitor C
₁Is the diode D₁Is charged to voltage E via. Time
Tick t₁And the switching element S₁Turn off and switch on
Element S₂When is turned on, the capacitor C₁And C₂Is a die
Aether D₂Connected via a capacitor C ₁Charge of
Part of capacitor C₂Go to and condenser C₂Is full
Be charged. Time t₂And the switching element S₂Is off
However, the voltage of each capacitor is almost held. Time t
₃And the switching element S₁When turned on, the capacitor
C₁Is the diode D₁Is charged to the voltage E via
Indexer C₂Part of the electric charge of the diode D₃Through
Indexer C₃Go to and condenser C₃Is charged.
Time t_FourAnd the switching element S₁Switch off
Element S₂When is turned on, the capacitor C₃And C_FourIs da
Iodo D_FourConnected via a capacitor C₃Electric power
Part of the load is capacitor C_FourGo to and condenser C_FourBut
Be charged. Time t_FiveAnd the switching element S₂Is off
However, the voltage of each capacitor is almost held. Time t
₆And the switching element S₁When turned on, the capacitor
C₁Is the diode D₁Is charged to the voltage E via
Indexer C_FourPart of the electric charge of the diode D_FiveThrough
Indexer C_FiveGo to and condenser C_FiveIs charged.
By repeating this, the capacitor C₁~ C_FiveLine charged
Ku.

Due to the operation of the switching elements S ₁ and S ₂ , the load voltage V ₃ rises from time t _{7 to} t ₁₁ , reaches the maximum value of the voltage at time t ₁₂ , and then the operating frequency of the switching element is changed. To lower the voltage V ₃ . At time t ₁₃ , the voltage V ₃ becomes minimum, and then rises. In this case, the operating frequency of the switching element (the number of signal pulses to the switching element per time) is shown in FIG.
As shown in (a) and (b), the supply voltage V ₃ to the load 2 can be made substantially sinusoidal by changing it to be sinusoidal.

[0012] Thus, the two series circuit of the switching elements S _1, S ₂ connected in parallel with the DC power source E, in parallel with the switching element S _2, alternately on and off of the switching elements S ₁ and S ₂ connect the multiplier X which can generate a high voltage from the power source in operation, load on the output of the multiplier circuit X 2, the operating frequency of the switching element S _1, S ₂ (per time to the switching element S _1, S ₂ The signal voltage V ₃ to the load 2 can be made substantially sinusoidal by varying the number of signal pulses of the capacitors C ₁ to C by increasing the operating frequency.
Since the ₅ and switching element S _1, S ₂ can be reduced, but can provide a compact power supply that can generate any ripple voltage.

A circuit diagram of the second embodiment of the present invention is shown in FIG. Explaining the basic configuration of the main circuit of this embodiment, a series circuit of switching elements S ₁ and S ₂ is connected in parallel with a DC power source E, and a multiplication circuit X is connected in parallel with the switching element S ₂ . This multiplication circuit X is a switching element S ₁
And a circuit capable of generating a high voltage from the DC power source E in alternating on and off operation of the S _2, has the same configuration as that of the circuit of FIG. The output of the multiplication circuit X has a switching element S
In the bridge circuit ₃ to S ₆ connects constituted polarity inverting circuit Y, which connects the load 2 between the switching element S _3, the connection point between S ₄ and the connection point of the switching elements S _5, S ₆ .

FIG. 4 shows an operation waveform diagram of this embodiment. First
The half-wave pulsating current voltage V ₃ as described in the embodiment is shown in FIG.
It occurs (a), the response to the pulsating voltage V _3, as shown in FIG. 4 (b), (c) , for one half-wave, first, the switching element S _3, S ₆ is turned on, and the positive voltage V ₄ is supplied to the load 2 as shown in FIG. Until time t ₁ , the voltages V ₃ and V ₄ drop in a substantially sine wave shape, and the switching elements S ₃ and S ₆ are near zero voltage.
Is turned off, the switching elements S ₄ , S ₅ are turned on, the polarity of the voltage V ₄ to the load 2 is inverted, and the negative voltage V ₄ is supplied. In this case, the supply voltage V ₄ to the load 2 can be made substantially sinusoidal by changing the operating frequency of the switching elements S ₁ and S ₂ (the number of signal pulses to the switching element per time) to be sinusoidal. it can.

Thus, the two switching elements
S₁, S₂The series circuit of is connected in parallel with the DC power supply E,
Itching element S₂In parallel with the switching element S₁When
S₂Alternating on and off operations can generate higher voltage than power supply
Connect the multiplier circuit X, and invert the polarity to the output of the multiplier circuit X
Connect the circuit Y and connect the load 2 to the output of the polarity inverting circuit Y
Switching element S₁, S₂Operating frequency
Switching element S ₁, S₂Number of signal pulses to)
Is changed to a sinusoidal wave to supply power to the load 2.
Pressure V₃Can be approximately sinusoidal, and the operating frequency
By increasing the number, each capacitor C₁~ C_FiveOr
Switching element S₁, S₂Can be made smaller
Therefore, we propose a small power supply that can generate any pulsating voltage.
It is something that can be offered.

A circuit diagram of the third embodiment of the present invention is shown in FIG. In this embodiment, the multiplication circuit X is connected to the negative side of the DC power supply E, and the load 2 is connected between the output of the multiplication circuit X and the negative side of the DC power supply E. A circuit diagram of the fourth embodiment of the present invention is shown in FIG. In the present embodiment, the multiplication circuit X is connected to the negative side of the DC power supply E, and the load 2 is connected between the output of the multiplication circuit X and the positive side of the DC power supply E. Also in the case of these embodiments, as in the above-described embodiments, a series circuit of _two switching elements S ₁ and S ₂ is connected in parallel with the DC power source E, and in parallel with the switching element S ₂ , the switching element S ₁ is connected. A multiplier circuit X capable of generating a higher voltage than a power supply by alternately turning on and off S ₂ is connected, a load 2 is connected to the output of the multiplier circuit X, and operating frequencies of the switching elements S ₁ and S ₂ (per hour) The supply voltage V ₃ to the load 2 can be made substantially sinusoidal by changing the number of signal pulses to the switching elements S ₁ and S ₂ sinusoidally, and by increasing the operating frequency, Since the capacitors C _{1 to} C ₅ and the switching elements S ₁ and S ₂ can be made small, it is possible to provide a small power supply device capable of generating an arbitrary pulsating voltage.

A circuit diagram of the fifth embodiment of the present invention is shown in FIG.
You To explain the basic configuration of the main circuit of this embodiment, DC power
Switching element S in parallel with source E₁, S₂Series circuit of
Connect, switching element S₂In parallel with the capacitor C
₁~ C_FiveAnd diode D₁~ D _FiveConnect a multiplication circuit consisting of
It continues. This multiplication circuit has a switching element S₁And S
₂High voltage is generated from DC power supply E by alternating on / off operation of
It is a circuit that can be produced and operates in the same manner as the circuit of FIG. Multiplication
The switching element S is provided at the output of the multiplication circuit.₃~ S₆Yellowtail
Switch to connect the polarity reversal circuit
Element S₃, S _FourConnection point and switching element S_Five，
S₆Connect the discharge lamp as load 2 between the connection points of
It One filament F of the discharge lamp₁Switching
Element S₇And S ₃Through the capacitor C_FiveDue to the charge of
Be heated. Also, the other filament F of the discharge lamp₂Is
Switching element S₈And S₆Through the capacitor C₁of
Preheated by electric charge.

FIG. 8 shows an operation waveform chart of this embodiment. First
The half-wave pulsating current voltage V ₃ as described in the embodiment is shown in FIG.
As shown in FIG. 8A, according to this pulsating current voltage V ₃ , as shown in FIGS. 8B and 8C, for one half wave, first, switching elements S ₃ and S ₆ is turned on, and the positive voltage V ₄ is supplied to the load 2 as shown in FIG. Until time t ₁ , the voltages V ₃ and V ₄ drop in a substantially sine wave shape, and the switching elements S ₃ and S ₆ are near zero voltage.
Is turned off, the switching elements S ₄ , S ₅ are turned on, the polarity of the voltage V ₄ to the load 2 is inverted, and the negative voltage V ₄ is supplied. In this case, the supply voltage V ₄ to the load 2 can be made substantially sinusoidal by changing the operating frequency of the switching elements S ₁ and S ₂ (the number of signal pulses to the switching element per time) to be sinusoidal. it can. Further, as shown in FIG. 8E, the ON time T of the switching elements S ₇ and S ₈ is increased during the period when the voltage V ₄ is a positive half wave.
By controlling x so that it has a predetermined duty, it is possible to supply a predetermined preheating power to each filament F ₁ , F ₂ .

[0019] Thus, the two series circuit of the switching elements S _1, S ₂ connected in parallel with the DC power source E, in parallel with the switching element S _2, alternately on and off of the switching elements S ₁ and S ₂ connect the multiplying circuit capable of generating a high voltage from the power source in operation, via the polarity inversion circuit composed of a switching element S ₃ to S ₆ connects the load 2 to the output of the multiplier circuit, the operation of the switching element S _1, S ₂ By changing the frequency (the number of signal pulses to the switching elements S ₁ and S ₂ per time) in a sine wave shape, it is possible to make the supply voltage V ₃ to the discharge lamp, which is a load, in a substantially sine wave shape. Preheating power for the filaments F ₁ , F ₂ of the discharge lamp can be supplied via the switching elements S ₇ , S ₈ . Further, since the capacitors C _{1 to} C ₅ and the switching elements S ₁ and S ₂ can be reduced by increasing the operating frequency, it is possible to provide a small power supply device that can generate an arbitrary pulsating voltage. is there.

FIG. 9 is an operation explanatory diagram of the sixth embodiment of the present invention. The circuit diagram of this embodiment is similar to that of FIG. In this embodiment, by changing the operating frequency of the switching element S _1, S ₂ (number of signal pulses to the switching element S _1, S ₂ per hour), at the time of pre-heating operation, gradually the voltage applied to the discharge lamp Is increased to increase the preheating current, and the ON period Tx of the switching elements S ₇ and S ₈ for preheating is set to be long. Then, the switching elements S ₇ and S ₈ are turned off at time t ₁ ,
It shows an operation in which the voltage applied to the discharge lamp is increased at once by increasing the number of pulses at once from time t ₁ to time t ₂ to start and light the discharge lamp. After that, the number of pulses is changed in a sine wave, the voltage is set to zero at time t ₃ , and then the voltage is increased to obtain a substantially sine wave output.
Also in this case, the preheating power of the filaments F ₁ and F ₂ of the discharge lamp can be supplied, the starting voltage of the discharge lamp can also be supplied, and by increasing the operating frequency, each capacitor Since the switching element and the switching element can be made small, it is possible to provide a small power supply device that can generate an arbitrary pulsating voltage.

FIG. 10 is an operation explanatory diagram of the seventh embodiment of the present invention.
Shown in. The circuit diagram of this embodiment is similar to that of FIG. In this embodiment, by varying the switching element S _1, S ₂ operating frequency (number of signal pulses to the switching element S _1, S ₂ per hour), and realizes a dimming operation. That is, in the dimming operation, the lamp current is reduced by reducing the number of operation pulses as a whole as compared with the full lighting operation. The example shown in FIG. 10 shows the operation of dimming the discharge lamp by gradually reducing the voltage applied to the discharge lamp by gradually reducing the number of pulses between times t _{1 and} t ₂ . In both the full lighting operation and the dimming lighting operation, the pulse number is sinusoidally changed to obtain a substantially sinusoidal output. Also in this case, the lamp power can be adjusted, and the capacitors and switching elements can be made smaller by increasing the operating frequency, so that a small power supply device that can generate an arbitrary pulsating current voltage can be provided. Can be provided.

FIG. 11 is an operation explanatory diagram of the eighth embodiment of the present invention.
Shown in. In this embodiment, the switching element S _1, the switching element per operating frequency (time S ₂ S _1, S ₂
By changing the number of signal pulses to (1), the function of limiting the output when a load abnormality is detected is realized. That is, when a load abnormality is detected, the lamp current is reduced by decreasing the number of operation pulses as a whole, and the voltage applied to the discharge lamp is gradually reduced to turn off the discharge lamp or light it with a low luminous flux. Perform the action. This makes it possible to protect the circuit when an abnormality is detected. Also in this case, by increasing the operating frequency, each capacitor and switching element can be made smaller,
It is possible to provide a small-sized power supply device that can generate an arbitrary pulsating current voltage.

FIG. 12 is an operation explanatory diagram of the ninth embodiment of the present invention.
Shown in. In this embodiment, the switching element S _1, the switching element per operating frequency (time S ₂ S _1, S ₂
By changing the number of signal pulses to the light source, the re-ignition during the dimming operation can be reliably performed. That is, in the dimming operation, the lamp current is decreased by decreasing the number of operation pulses as a whole as compared with the case of the all-lighting operation, but the number of pulses is increased at once from time t _{1 to} t ₂ . As a result, the pulse voltage is supplied at the first predetermined phase of the half-wave voltage waveform applied to the discharge lamp load, and the voltage applied to the discharge lamp is reduced compared to during full lighting operation, but to maintain lighting. The necessary voltage is supplied to the discharge lamp for stable dimming. Also in this case, the lamp power can be adjusted, and the capacitors and switching elements can be made smaller by increasing the operating frequency, so that a small power supply device that can generate an arbitrary pulsating current voltage can be provided. Can be provided.

FIG. 13 is a circuit diagram of the tenth embodiment of the present invention.
Show. In this embodiment, the capacitor C_FiveAs the next stage of
Densa C₆~ C₉, Diode D₆~ D₉Connect the
Iodo D_TenBy capacitor C_FiveLoad up to voltage
2 to supply the switching element S₉By capacitor
C₉So that a higher voltage up to
Is made. As a result, the switching element S₁, S
₂Even if the operating frequency changes the same,
Element S₉When is on, the discharge lamp load is fully turned on.
Done, switching element S₉When is off, the dimming point
It is possible to perform a lighting operation. Also, in FIG.
Time t₁~ T₂And the switching element S ₉Turn on
This enables stable dimming of the discharge lamp load.
You can also realize the work. That is, during dimming operation
Is the switching element S₁, S₂The number of operating pulses of
Lamp current to reduce the lamp current.
At time t₁~ T₂With switching element S₉To
By turning on and supplying a high pulse voltage all at once
Maintaining a stable lighting state and dimming the discharge lamp
It becomes possible. In this case, the switching element S₁，
S₂Operating frequency and switching element S₉On / off
The lamp power can be adjusted over a wide range by combining
And also to increase the operating frequency
Therefore, make each capacitor and switching element small.
Because it is capable of generating a small pulsating voltage, it is small
A power supply device can be provided.

FIG. 14 is a circuit diagram of the eleventh embodiment of the present invention.
Show. In this embodiment, the capacitor C_FiveAs the next stage of
Indexer C₆~ C₉, Diode D₆~ D₉Connect
Diode D_TenBy the capacitor C_FiveUp to voltage
Supply to load, diode D ₁₁By capacitor C₉
Configured to be able to supply higher voltage up to the load
And the upper capacitor C₆~ C₉, Diode D₆
~ D₉Circuit of switching element S_TenTo work with
I have to. As a result, the switching element S ₁, S₂
Even if the change in the operating frequency of the
Child S_TenWhen is on, the discharge lamp load is fully lit.
Switching element S_TenDimming when is off
It becomes possible to perform operations. Also, at the time of FIG.
Tick t₁~ T₂And the switching element S_TenTurn on
By, the operation of lighting the discharge lamp with stable dimming
Can also be realized. That is, during the dimming operation,
Switching element S₁, S₂The number of operating pulses of
The lamp current is reduced by decreasing
At time t₁~ T₂With switching element S_TenTurn on
Stable by supplying a high pulse voltage all at once
The discharge lamp can be dimmed to maintain the lighting state.
It will be possible. In this case, the switching element S ₁, S₂of
Operating frequency and switching element S_TenON / OFF combination
By adjusting, the lamp power can be adjusted over a wide range.
Can be achieved, and by increasing the operating frequency
And make each capacitor and switching element small.
A small power supply that can generate any pulsating current voltage.
A device can be provided.

FIG. 15 is a circuit diagram of the twelfth embodiment of the present invention.
FIG. 16 is an operation explanatory diagram thereof. In this embodiment,
DC power supply E₁Switching element S in parallel with₁, S₂Directly
Connect the column circuit and switch S₂In parallel with
Densa C₁~ C_FiveAnd diode D₁~ D_FiveMultiplication
The circuit is connected. This multiplication circuit is a switching element
S₁And S₂DC power supply E by alternating on / off operation of₁Than
It is a circuit that can generate high voltage and operates in the same way as the circuit in Fig.1.
To make. In addition, DC power supply E₂Switching device in parallel with
S₁₁, S₁₂Of the switching element S by connecting the series circuit of₁₂
In parallel with the capacitor C₁₁~ C₁₅And diode D₁₁~ D
₁₅Is connected to the multiplication circuit. This multiplier circuit is
Itching element S₁₁And S₁₂Alternate on / off operation
Current source E ₂It is a circuit that can generate higher voltage.
Works like a circuit. Between the outputs of these two multipliers
The load 2 is connected to the
S _{twenty one}, S_{twenty two}DC power supply via₁, E₂Contact the ground of
It is a continuation.

Each of the multiplying circuits generates a voltage waveform of a sine half wave, and the multiplying circuit on the DC power supply E ₁ side operates and the multiplying circuit on the DC power supply E ₂ side operates during the period from time t _{0 to} t _1. The switching element S ₂₂ is turned on and the switching element S ₂₁ is turned off. At this time, the voltage V ₄ supplied to the load has a positive polarity. Further, in the period after time t ₁ , the multiplication circuit on the DC power supply E ₂ side operates and the DC power supply E ₁
The multiplication circuit on the side stops the operation, the switching element S ₂₁ is turned on, and the switching element S ₂₂ is turned off. At this time, the voltage V ₄ supplied to the load has a negative polarity. As described above, by using two multiplication circuits, it is possible to supply AC power to the load while making the voltage V ₄ to the load substantially sinusoidal, without using the polarity inversion circuit having the full bridge structure. By increasing the operating frequency, it is possible to reduce the size of each capacitor and switching element, so that it is possible to provide a small power supply device that can generate an arbitrary pulsating voltage.

A circuit diagram of the thirteenth embodiment of the present invention is shown in FIG. In this embodiment, in the circuit of FIG.
_One DC power supply E is used for both ₁ and DC power supply E ₂ . Thus, in the case of using two multiplication circuits, by sharing the DC power supply of each multiplication circuit,
It is possible to further reduce the size, and it is possible to supply AC power while making the supply voltage to the load substantially sinusoidal. Also, by increasing the operating frequency, each capacitor and switch can be made smaller. Therefore, it is possible to provide a small power supply device capable of generating an arbitrary pulsating current voltage.

A circuit diagram of the fourteenth embodiment of the present invention is shown in FIG. Similar to the thirteenth embodiment, this embodiment uses _one DC power supply E for both the DC power supply E ₁ and the DC power supply E ₂ in the circuit of FIG. 15, and further uses one switching element S ₁ and S ₁₁ for switching. It is also used as the element S ₁ . As described above, in the case of using two multiplication circuits, it is possible to further downsize by sharing the DC power source of each multiplication circuit and further sharing the switching element, and to reduce the supply voltage to the load. It is possible to supply alternating-current power while forming a substantially sine wave shape, and since each capacitor and switch can be made smaller by increasing the operating frequency, a small power supply device that can generate an arbitrary pulsating current voltage can be provided. Can be provided.

A circuit diagram of the fifteenth embodiment of the present invention is shown in FIG. To explain the basic configuration of the main circuit of this embodiment, a series circuit of switching elements S ₁ and S ₂ is connected in parallel with a DC power source E, and a multiplication circuit X is connected in parallel with the switching element S _2.
And the load 2 is connected to the output of the multiplication circuit X via another power conversion means U. The multiplication circuit X is a circuit that can generate a high voltage from the DC power supply E by alternately turning on and off the switching elements S ₁ and S ₂ , and performs the same operation as the circuit of FIG. As the other power conversion means U, any means such as an inverter circuit or a chopper circuit can be used.

[0031]

According to the present invention, since the voltage variable circuit capable of boosting the power supply voltage is constituted by the combination of the capacitor and the switching element, an inductor for power conversion is not required, and a large resonant circuit is used. A high-frequency voltage can be generated by using a means for controlling pulsating voltage generation and polarity reversal without the need for a capacitor, and a high-frequency voltage can be supplied using a small capacitor. There is an effect that miniaturization is possible.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the first embodiment of the present invention.

FIG. 3 is a circuit diagram of a second embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the second embodiment of the present invention.

FIG. 5 is a circuit diagram of a third embodiment of the present invention.

FIG. 6 is a circuit diagram of a fourth embodiment of the present invention.

FIG. 7 is a circuit diagram of a fifth embodiment of the present invention.

FIG. 8 is an operation explanatory diagram of the fifth embodiment of the present invention.

FIG. 9 is an operation explanatory diagram of the sixth embodiment of the present invention.

FIG. 10 is an operation explanatory diagram of the seventh embodiment of the present invention.

FIG. 11 is an operation explanatory diagram of the eighth embodiment of the present invention.

FIG. 12 is an operation explanatory diagram of the ninth embodiment of the present invention.

FIG. 13 is a circuit diagram of a tenth embodiment of the present invention.

FIG. 14 is a circuit diagram of an eleventh embodiment of the present invention.

FIG. 15 is a circuit diagram of a twelfth embodiment of the present invention.

FIG. 16 is an operation explanatory diagram of the twelfth embodiment of the present invention.

FIG. 17 is a circuit diagram of a thirteenth embodiment of the present invention.

FIG. 18 is a circuit diagram of a fourteenth embodiment of the present invention.

FIG. 19 is a circuit diagram of a fifteenth embodiment of the present invention.

FIG. 20 is a circuit diagram of a conventional example.

FIG. 21 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

1 control circuit 2 load X multiplication circuit E DC power supply S ₁ switching element S ₂ switching element

Claims (11)

[Claims] 1. A series circuit of first and second switching elements is connected in parallel with a DC power source, and at least a capacitor and a switching element are provided between both ends of one switching element. A power supply device characterized in that a voltage varying means for generating a voltage by an on / off operation of a switching element is connected, and one end of a load is connected to at least an output of the voltage varying means. 2. The power supply device according to claim 1, wherein the voltage varying means is a Cockcroft-Walton circuit. 3. The power supply device according to claim 1, wherein the load is a discharge lamp. 4. The power supply device according to claim 1, wherein the load is a power conversion device. 5. The power supply device according to claim 1, further comprising control means for changing an output voltage of the voltage varying means according to a state of a load. 6. The load is a discharge lamp, and the control means is configured to change the output voltage of the voltage varying means according to preheating, starting, and lighting state of the discharge lamp load. The power supply device according to claim 5. 7. The load is a discharge lamp, and the control means modulates the on / off operation frequency of the switching element in accordance with the required voltage of the discharge lamp load for preheating, starting and lighting, and the voltage varying means. 6. The power supply device according to claim 5, wherein the power supply device is configured to change the output voltage of the power supply. 8. The power supply device according to claim 1, further comprising means for inverting the polarity of the output voltage between the voltage varying means and the load. 9. The load is a hot cathode type discharge lamp,
9. The power supply device according to claim 6, further comprising preheating means for supplying a preheating current to the hot cathode by the output of the voltage varying means. 10. The load is a discharge lamp, and the voltage varying means includes means for supplying a pulse voltage for maintaining lighting so that a lighting state of the load is stable during dimming. 5. The power supply device according to item 5. 11. The power supply device according to claim 1, comprising a plurality of the voltage varying means, and configured to supply a differential voltage of each voltage varying means to a load.