JPH10337015A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply in which increase in the number of switching elements is suppressed even if a plurality of converter circuits are employed while eliminating the need of enhancing the breakdown strength of switching element more than required. SOLUTION: The power supply is provided with a plurality of converter circuit 41 ,... comprising shaper circuits 61 ,..., rectifying elements 71 ,... and a switching element 5 shared by all converter circuits 41 ,.... Since the switching element 5 is shared by all converter circuits 41 ,..., increase in the number of switching elements is suppressed and power is fed from each converter circuit 41 to one load 2 through respective rectifying elements 71 ,....

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 adjusting power by a switching operation.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Power supply 3 for converting the input from the power supply and supplying it to load 2
There is. In the case where the converter circuit 4 that performs power conversion of the power supply device 3 is a switching converter that includes a switching circuit that performs a switching operation and an inductance element, the switching element is formed by turning on and off the switching element in FIG. For example, FIG.
As shown in FIG. 27B, the current of the sawtooth wave, or FIG.
As shown in (c), a current waveform flows as if a direct current was superimposed on the sawtooth wave.

A power supply device 3 using a plurality of such converter circuits is configured as shown in FIG. In the illustrated example, the power of the power supply 1 is converted by a plurality of converter circuits 4 ₁ ,..., 4n and the outputs are connected in series via rectifying elements 7 ₁ . For example, Japanese Patent Application Laid-Open No. 62-283466 discloses a high voltage generator.

A plurality of outputs are connected to a plurality of loads 2 ₁ ,.
If the power supply 3 so as to supply to the 2n, a plurality of the converter circuit 2 ₁ as shown in FIG. 29, ..., there is a power supply apparatus constituting a combination of 2n. For example, see JP-A-1-186.
No. 161 shows an example.

[0005]

By the way, in the case of a power supply device composed of a plurality of converter circuits, the number of switching elements increases, so that there is a problem that the cost is increased if a driving circuit is included. . The present invention has been made in view of the above-described problems, and has as its object to suppress the increase in the number of switching elements even when a plurality of converter circuits are used, and to further increase the withstand capacity of the switching elements more than necessary. In providing the device.

[0006]

According to the first aspect of the present invention, at least one or more power supplies are provided.
A plurality of converter circuits that supply power to at least one or more loads and adjust the power by changing the switching frequency and duty of the switching elements, and the converter circuit includes a switching circuit and a preceding or subsequent stage or both. In a power supply device provided with a waveform shaping circuit for shaping a current waveform and a rectifying element, a switching element is shared by a plurality of converter circuits.

According to a second aspect of the present invention, in the first aspect of the present invention, each converter circuit is independently connected to a power supply. The invention of claim 3 is claim 1
According to the invention, the output of each converter circuit is separately connected to a load. According to a fourth aspect of the present invention, in the first aspect of the invention, the outputs of the converter circuits are connected in series or in parallel, combined, and connected to a load.

According to a fifth aspect of the present invention, in the first aspect of the present invention, of the electric current supplied to the load and the electric current flowing through the switching element which is shared among the electric currents flowing through the respective converter circuits determined by the waveform shaping circuits of the respective converter circuits, From the value calculated from (the sum of the maximum values in the ON period of the switching element / the sum of the average values in the ON period of the switching element), the maximum value of at least the combined current of the shared switching element in the (ON period of the switching element) The current waveform of each converter circuit is set such that a value calculated from the average value during the ON period of the switching element is reduced.

According to a sixth aspect of the present invention, in the first aspect of the present invention, a value obtained from (maximum value / average value in the ON period of the switching element) of the combined current of each converter circuit flowing through the switching element is 2 or less. The current waveform of each converter circuit is set so as to be small. According to a seventh aspect of the present invention, in the first aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing in one converter circuit is different from the generation point of the maximum value of the current waveform of the current flowing in the other converter circuit. It is characterized by the following.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing in at least one converter circuit is the generation of the minimum value of the current waveform of the current flowing in another converter circuit. It is characterized in that it is set near the time point. According to a ninth aspect of the present invention, in the first aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing through the at least one converter circuit is close to the generation point of the minimum value of the current waveform of the current flowing through the other converter circuits. It is characterized by having become.

According to a tenth aspect of the present invention, in the first aspect of the present invention, a section where the maximum value of the current waveform of the current flowing in at least one converter circuit and the average current between two adjacent minimum values are the other section is the other section. The current waveform is set so as to be different from a section where the maximum value of the current waveform of the current flowing in the converter circuit and the average current between two adjacent minimum values are largest.

According to an eleventh aspect of the present invention, in the first aspect, a current waveform of a current flowing through at least one converter circuit does not reach a maximum value when the switching element is off. According to a twelfth aspect of the present invention, in the first aspect, at least one converter circuit supplies a substantially sinusoidal current to the shared switching element.

According to a thirteenth aspect of the present invention, in the twelfth aspect of the invention, the two or more converter circuits pass a substantially sinusoidal current to the shared switching element, and at least a substantially sinusoidal wave that flows into at least one of the converter circuits. The time when the maximum value of the current is different from the time when the maximum value of the substantially sinusoidal current flowing into another converter circuit is set.

According to a fourteenth aspect of the present invention, in the twelfth aspect of the present invention, the two or more converter circuits pass a substantially sinusoidal current to the shared switching element, and a substantially sinusoidal wave that flows into at least one of the converter circuits. The maximum value and the period of the current are set to be different from the maximum value and the period of the substantially sinusoidal current flowing into another converter circuit.

According to a fifteenth aspect, in the first aspect, a resonance circuit is used as a waveform shaping circuit of at least one converter circuit. According to a sixteenth aspect, in the fifteenth aspect, a resonance circuit is used for a waveform shaping circuit of two or more converter circuits, and at least one of the resonance currents flowing into the converter circuit has a maximum value at another time. Is set to be different from the time when the resonance current reaches the maximum value.

According to a seventeenth aspect of the present invention, in the invention of the fifteenth aspect, a resonance circuit is used for a waveform shaping circuit of two or more converter circuits, and at least one of the resonance currents flowing into the converter circuit has a maximum value and a resonance value. The period is set so as to be different from the maximum value of other resonance currents and the resonance period. According to an eighteenth aspect of the present invention, in the first aspect of the present invention, at least one converter circuit includes a waveform shaping circuit in which a converter current flowing from a shared switching element has a monotonically increasing current waveform, and at least one converter circuit. A resonance circuit is used as a waveform shaping circuit of the circuit.

According to a nineteenth aspect of the present invention, in the first aspect of the present invention, at least one converter circuit is cascaded so as to be an input of at least one other converter circuit.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a basic configuration of the present embodiment. A power supply device 3 having this basic configuration includes a power source 1 as shown in FIG.
Semiconductor switching element such as a waveform shaping circuit 6 ₁ ... and the rectifying device 7 ₁ ... and MOSFET (following embodiments as well)
Are provided with a plurality of converter circuits 4 _1, ... Composed of a plurality of switching elements 5. The switching elements 5 are shared by all the converter circuits 4 ₁ ,. Further and supplies power to one of the load 2 via the rectifying element 7 ₁ ... provided respectively from each converter circuit 4 _1.

[0019] FIG. 2 shows a circuit in which more specifically represent the basic configuration of FIG. 1, in this exemplary circuit, the waveform shaping circuit 6 ₁ of each converter circuit 41 _{to 5} to the power supply 1
The inductor L ₁ ~L ₅ constituting the 6 _5, as well as connected through a common switching element 5, the load to the power source 1 through the rectifier element 7 _{1-7 5} consisting of the inductor L ₁ ~L ₅ and the diode 2 are connected.

In the circuit shown in FIG.
When the turning on and off as shown in FIG. 7 (a) at a high speed, the current to the load side through the inductor L ₁ ~L ₅ constituting the waveform shaping circuit of each converter circuit 41 _{to 5} when on Ic
₁ ～Ic ₅ start to flow, the waveform of the current flowing through each converter circuit 7 _{1-7 5} becomes a monotonically increasing waveform gradually increases as shown in FIG. 3 (b) ~ (f) , the switching element 5 is turned off Peaks just before

When the switching element 5 is turned off, the current flowing through the switching element 5 becomes zero, and the inductor L ₁
Energy stored in ~L ₅ is sent to the load 2 side through the rectifying element ₄₁ to _5. Therefore, the switching element 5
Current flows from the inductor L ₁ ~L ₅ is a waveform shaping circuit of the converter circuit 4 ₁ ~4 ₅ I _C1 ~I _C5 Figure 3
As shown in (b) to (f), a sawtooth waveform is obtained.

The current I _C1 to the switching element 5 flowing through all of the converter circuit ₄₁ to ₅ as shown in FIG. 3 (g) ~
Since the total current Isw of I _C5 flows, the current peak value immediately before the switching element 5 is turned off is determined by each converter circuit 4 ₁
The sum of the peak of to 4 ₅ current. Although a circuit for controlling the drive of the switching element 5 is not shown in the figure, it goes without saying that a drive control circuit is provided.

(Embodiment 2) This embodiment corresponds to Embodiment 1.
1 is basically the same as the circuit shown in FIG. 2, and the number of converter circuits constituting the power supply device 3 is 5 as shown in FIG.
In the case of the current I of the converter circuit 4 _{1-4 5}
It is set so as to shift as shown in FIG. 5 (b) ~ (f) the peak time of _c1 ~I _c5 by the respective waveform shaping circuits _{61 through 65} including an inductor.

[0024] In this case, the current Isw for switching device 5 the sum of the current I _c1 ~I _c5 of each converter circuit ₄₁ to ₄ flows is as shown in FIG. 9 (g), the possible reduction current peak. For this reason, it is possible to reduce the withstand current of the switching element 5 and the conduction loss. Further, since the current value at the time when the switching element 5 is turned off is also reduced, the switching loss can be reduced.

FIG. 5A shows the ON / OFF timing waveform of the switching element 5. Switching element 5
Is not shown in the figure, but it goes without saying that a drive control circuit is provided. While Example 3 This embodiment is also obtained by the basic circuit of Figure 1 embodiment 1, the waveform shaping circuit of the converter circuit 41 _{to 5} as shown in FIG. 6 have the resonant circuit And it has a configuration of a current resonance type converter.

[0026] That waveform shaping circuit of the converter circuit 41 _{to 5} in the circuit of this embodiment and the energy of the power supply 1 from the switching element 5 diode D _i1 ... shown in FIG. 6,
It is configured by a resonance circuit that charges the capacitors C ₁ through the inductors L _1. The resonance period is set to be shorter than the ON time of the switching element 5. The output of each converter circuit 41 _{to 5} rectifying device 7 ₁
7 _5, is connected to the load 2 via an inductor L _0. The inductor L ₀ forms a closed circuit via the load 2 and the diode D ₂ .

[0027] Thus to 7 when the switching element 5, as shown in (a) is turned on, the converter circuit ₄₁ to the ₅ 7 (b) to 7-each waveform shaping circuit as shown in (f) sinusoidal half his shaped current I _c1 ~I _c5 flows by the resonant circuit of. Then after the output through a rectifying element 7 _{1-7 5} is removed from the capacitor C ₁ -C ₅ resonant circuit of each converter circuit 41 _{to 5,} smoothed by large enough inductor L ₀ compared to the inductance of the resonant circuit Then, power is supplied to the load 2.

[0028] and the peak value of the waveform of the current I _c1 ~I _c5 flowing through each of the converter circuit ₄₁ to ₅ by setting the resonant circuit constant of the waveform shaping circuit of the converter circuit ₄₁ to _5, each predetermined value by varying the resonance period as shown in FIG. 7 (b) ~ (f) , each converter circuit 4 _1-4
The shared switching element 5 through which the combined current of ₅ flows
A current Isw flows as shown in FIG.

The current flowing through the switching element 5 has a lower peak value than the current waveform (shown in FIG. 8) of the current resonance type converter for obtaining the same power, and
Can reduce the withstand current and reduce conduction loss. Although a circuit for controlling the drive of the switching element 5 is not shown in the figure, it goes without saying that a drive control circuit is provided.

[0030] (Embodiment 4) This embodiment is also obtained by the basic circuit of Figure 1 embodiment 1, 2 Tsude number of the converter circuit 4 _1, 4 _2, as shown in FIG. 9, each converter each waveform shaping circuit of the circuit 4 _1, 4 ₂ has a resonant circuit, has the same in the current resonant converter arrangement as the third embodiment.

In the present embodiment, one converter circuit 4 ₁
The waveform shaping circuit is configured to energy supply 1 in the LC resonance circuit for charging the capacitor C ₁ through the diode D _i1 and inductance L ₁ from the switching element 5, as the resonance period becomes shorter than the ON time of the switching element 5 Is set to When the switching element 5 shared by the converter circuits 4 ₁ and 4 ₂ is turned on as shown in FIG. 10 (a), the resonance circuit constituting the waveform shaping circuit is turned on as shown in FIG.
As shown in (b), a half-sinusoidal current I _C1 flows.

[0032] The other converter circuit 4 _second waveform shaping circuit is composed of a LC resonant circuit for charging the energy of the power supply 1 saturable reactor SR from the switching element 5, diode D _i2, the capacitor C ₂ through inductor L ₂ I have. When the shared switching element 5 is turned on, a small amount of current flows for a predetermined time until the saturable reactor SR is saturated, and after saturation, a half sinusoidal current flows in the LC resonance circuit as shown in FIG. .

The sum of the saturation time of the saturable reactor SR and the time during which the half-sine current flows through the resonance circuit is set to be shorter than the ON time of the switching element 5. After output through a rectifying element 7 _1, 7 ₂ from the capacitor C _1, C ₂ of each converter circuit 4 _1, 4 ₂ of the resonant circuit is removed, smoothed by large enough inductor L ₀ compared to the inductance of the resonant circuit , And supplies power to the load 2.

Each converter overnight circuit 4₁, 4_TwoWaveform shaping times
Circuit resonant circuit constant and saturable reactor SR at saturation
By setting each interval to a predetermined value, each converter
Road 4 ₁, 4_TwoThe peak value of the current waveform flowing through
FIG. 10 shows the timing at which the peak value is reached.
(B), (c), each converter
Data circuit 4₁, 4_TwoShared switch through which the combined current of
The current I as shown in FIG._SWFlow
It is.

The current I _SW flowing through the switching element 5
8, the peak value is lower than the current waveform of the current resonance type converter circuit for obtaining the same power as shown in FIG. Although a circuit for controlling the drive of the switching element 5 is not shown in the figure, it goes without saying that a drive control circuit is provided.

[0036] (Embodiment 5) This embodiment also the circuit in Figure 1 embodiment 1 which was a basic, 2 Tsude number 4 _1, 4 ₂ of the converter circuit as shown in FIG. 11, the converter circuit 4 _second waveform shaping circuit has a resonant circuit, has the same in the current resonant converter arrangement as the fourth embodiment.

[0037] and with an inductor L ₁ of the current limiting as one of the converter circuit 4 ₁ of the waveform shaping circuit. When the common switching element 5 is turned on as shown in FIG. 12A, the current I _C1 starts flowing to the waveform shaping circuit and the load 2 side, and monotonically increases. And the switching element 5
The current increases until is turned off, resulting in a sawtooth current waveform shown in FIG. Diode D ₁ is inductor L
₁ , a rectifying element 7 ₁ and a load 2 constitute a closed circuit.

[0038] The other converter circuit 4 _second waveform shaping circuit is constituted by an LC resonant circuit for charging the capacitor C ₂ through the diode D _i2 and the inductor L ₂ of energy supply 1 from the switching element 5, the resonance period It is set so as to be shorter than the ON time of the switching element 5.
When the common switching element 5 is turned on, a half sinusoidal current I _C2 is applied to the resonance circuit forming the waveform shaping circuit in FIG.
Flows as shown in FIG.

The output of the converter circuit 4 ₂ is smoothed by the inductor L ₀ with a sufficiently large inductance than the inductor L ₂ of the resonant circuit, the load through the rectifier element 7 ₂ 2
To supply power. The diode D ₂ forms a closed circuit with the inductor L ₀ , the rectifying element 7 ₂ , and the load 2. Resonant circuit constant of the waveform shaping circuit of the converter circuit 4 _2, the converter circuit 4 ₁ of the inductance value of the waveform shaping circuit is set to the predetermined value, the resonance current I _C2 of the converter circuit 4 ₂ As shown in FIG. 12 (c) Pas them as biased forwardly of the on period of the switching element 5, the period the current value is small in the waveform of the current I _C1 of monotonically increasing as shown in FIG. 12 (b) flowing through the converter circuit 4 _1, converter evening circuit 4 ₂ since current is concentrated, the switching element 5 share the composite current of each converter circuit 4 _1, 4 ₂ flows 12
A current I _SW flows as shown in FIG.

The current I _SW flowing through the switching element 5
Each converter circuit 4 _1, 4 current flowing to ₂ I
_{Since the} sections where _C1 and I _C2 become large are shifted, the peak value is obtained from the current waveform of the current resonance type converter circuit shown in FIG. 8 for obtaining the same power and the current waveform of the switching element of the step-down chopper circuit shown in FIG. Can be reduced, and the current withstand capability of the switching element 5 and the conduction loss can be reduced.

In the circuit configuration of FIG.
Road 4₁While the switching element is on,
Style I_C1Increases monotonically, resulting in a sawtooth waveform
Circuit and converter circuit 4_TwoSinusoidal current I
_C2Sharing switching elements in converter circuits where heat flows
If so, the converter circuit 4₁The output of the switching
Adjustable with the on-duty and switching frequency of element 5
Converter circuit 4 _TwoOutput of the switching element 5
Under the condition that the on-time of
Two converters can be adjusted by the switching frequency
Circuit 4₁, 4_TwoAdjust the output of the device to some extent independently
Is possible.

[0042] In the arrangement of FIG. 11 two of the converter circuit 4 _1, 4 ₂ output terminals are connected in parallel, although the increase in the output current capacity is achieved, the converter circuit 4 ₁ as in the configuration of FIG. 14 , 4 _second output terminals of the smoothing capacitor C _01, C
_The output power may be increased by connecting in series through ₀₂ . Although a circuit for controlling the driving of the switching element 5 is not shown in FIG. 11, it goes without saying that a drive control circuit 8 shown in FIG. 14 is provided.

(Embodiment 6) In this embodiment, as shown in FIG. 15, one power supply 1 is provided, and a plurality of converter circuits 4 ₁ ... Constituting a power supply device 3 are respectively connected to different loads 2 ₁ . ₁ is provided with a waveform shaping circuit 6 ₁ and a rectifying element 7 _1. Each of the converter circuits 4 ₁ ... Has the same configuration as that of FIG.

FIG. 16 shows a specific example of the configuration shown in FIG. 15, and the configuration shown in the drawing is composed of two converter circuits 4 ₁ and 4 _2.
Of the converter circuits 4 ₁ and 4 ₂ , except that one of them 4 ₂ is used as a drive control circuit 8 of the switching element 5 as a load, and the remaining 4 ₁ supplies power to the external load 2. The configuration is similar to the circuit configuration of FIG. The capacitors C ₀₁ and C ₀₂ are smoothing capacitors.

[0045] In the circuit of Thus to FIG. 16, the sawtooth current I _C1 flows through the circuit similarly to the converter circuit 4 ₁ of Figure 11 embodiment 5, utilizing the other converter circuit 4 ₂ At the resonant circuit was and sinusoidal so he shaped current I _C2 flows, the output of the converter circuit 4 ₁ supplies power to the external load 2, the output of the converter circuit 4 ₂ to the power unit 3 inside the drive control circuit 8 Supply power.

[0046] While the circuit of Figure 16 was connected to the output of the converter circuit 4 ₂ to the power supply 3 inside the drive control circuit 8, the circuit of Figure 17 the converter circuit 4 _1, 4 ₂ both external load 2 _1, to 2 ₂ shows an example in which to supply the power. In this case the load 2 _1, 2 ₂ consists of lighting device connected to the discharge lamp 9 _1, 9 ₂ via the inverter circuit INV _1, INV ₂ low frequency.

(Embodiment 7) In Embodiment 1, the power supply 3
Although one power supply 1 was configured to be connected to, in the present embodiment, as shown in FIG. 18 has a plurality of power 1 ₁ ..., a plurality of the converter circuit 4 ₁ constituting the power supply device 3 ...
Power 1 ₁ ... are connected to each other in, and the converter circuit 4
₁ are connected to one load 2. The operation of the seventh embodiment is basically the same as that of the first embodiment, and a description thereof will not be repeated.

(Embodiment 8) In Embodiment 7, FIG.
As shown, each converter circuit 4₁... power supply 1 for each ₁…
And the output is connected to one load 2.
However, in the present embodiment, two power supplies 1₁, 1_TwoAnd each
Power supply 1₁, 1_TwoConverter circuits connected to each other
4₁, 4_TwoAnd each converter circuit 4₁, 4_TwoOutput
Are connected to different loads, as in the case of FIG.
Converter circuit 4₁Supplies power to the external load 2 and
Inverter circuit 4_TwoUses the internal drive control circuit 8 as a load
The power is supplied to the circuit 8. That is, a book
The embodiment is a converter circuit 4₁, 4 _TwoBut separate power supply
1₁, 1_TwoExcept that it is connected to
And the converter circuit 4₁, 4_TwoFigure 1
1 converter circuit 4₁, 4_TwoWorks the same as.

[0049] (Embodiment 9) This embodiment a power supply device 3 composed of a plurality of converter circuits 4 ₁ ... as shown in FIG. 20, in which each converter circuit 4 ₁ ... has shared the switching element 5 there, although the power supply 1 is connected to the input of the first converter circuit 4 _1, the converter circuit 4 ₂ ... input other than the first stage uses the output of the preceding stage of the converter circuit. In addition, the final stage converter circuit 4
The output of _n becomes the output of the power supply device 3, but the outputs other than the last stage are connected to the input of the next stage. As described above, in the present embodiment, the converter circuits 4 ₁ are cascaded.

Each of the converter circuits 4 ₁ has the above-mentioned waveform shaping circuits 6 ₁ to reduce the current flowing through the shared switching element 5. FIG. 21 is a specific example of the circuit configuration of FIG.
_1, 4 ₂ constitute a power supply unit 3, the respective converter circuits 4 _1, 4 ₂ is a substantially identical to the circuit configuration basically in FIG. 17, the converter circuit 4 ₁ similar to the configuration of FIG. 17 to configure the converter circuit flowing saw tooth current, the other converter circuits 4 ₂ constitute the converter circuit 4 ₂ similarly to the converter circuit sinusoidal current flows using a resonance circuit of FIG. Note that the capacitor _C01 is a smoothing capacitor.

Converter circuit 4₁Is the switching element 5
When the inductor L₁Accumulates magnetic energy in the
When the magnetic energy is₁Via conde
Sensor C₁To charge a DC voltage higher than the voltage of the power supply 1.
It is a boost type chopper that can be obtained. And this converter circuit
4₁Converter circuit 4 which inputs the DC which was boosted in step 4
_TwoIs the converter circuit 4 shown in FIG._TwoCurrent resonance type as well
The power conversion is performed by using the circuit of FIG.

[0052] Note that the element of the converter circuit 4 ₂ are denoted by the same symbols as the common elements of the converter circuit 4 ₂ of FIG. 11. (Embodiment 10) In this embodiment, a plurality of the converter circuit 4 ₁₁ ... which are cascade-connected as shown in FIG. 22, 4 ₂₁ ... each converter circuit 4 ₁₁ with each group connected to a plurality parallel of
, ₄₂₁ ... share the switching element 5. . In the illustrated example, two groups are connected in parallel, but the number of groups may be three or more. Further, in order to increase the output voltage, the output of the last stage of the cascade connection group may be connected in series.

Each of the converter circuits 4 ₁₁ , 4 _21, is composed of a waveform shaping circuit 6 ₁₁ , 6 _21, and a rectifying element 7 ₁₁ , 7 ₂₁ , and the waveform shaping circuits 6 ₁₁ , 6 ₂₁ ,. Thus, the current flowing through the switching element 5 is reduced. Figure 23 is an embodiment of the structure of FIG. 22, each group in this configuration consists of a converter circuit 4 _11, 4 ₁₂ groups of cascaded, the converter circuit 4 _21, 4 ₂₂ group, the converter circuit 4 ₁₁ , 4 ₁₂ consists respectively boost chopper, the converter circuit 4 _12, 4 ₂₂ consists converter circuit of the resonant circuit type, the operation of each group operates similarly to the group of FIG. 21, the front stage of the converter circuit 4 ₁₁ to boost the voltage of the power supply 1 in 4 _21,
This boosted DC is used as a current resonance type converter circuit 4 ₁₂ ,
At ₄₂₂ , power conversion is performed.

The converter circuit 4₁₁, 4_{twenty one}Inductor
L₁₁, L_{twenty one}Is the converter circuit 4 shown in FIG.₁Induct
L₁And the capacitor C₁₁, C₁₂Is the con
Barter circuit 4₁Capacitor C₁Rectifier element 7
₁₁, 7_{twenty one}Is the converter circuit 4 of FIG.₁Rectifying element 7₁
Is equivalent to Converter circuit 4₁₂, 4_{twenty two}Induct
L_{twenty one}, L_{twenty two}, Capacitor C_{twenty one}, C _{twenty two}Is the
Barter circuit 4_TwoInductor L_Two, Capacitor C_TwoPhase
A rectifier element 7₁₂, 7_{twenty two}Figure 21
Converter circuit 4_TwoRectifying element 7_TwoEquivalent to
Code D_{twenty two}, D_{twenty one}Is the converter circuit 4 of FIG._TwoThe Daio
Code D_TwoAnd the inductor L₀Is an inductor_{twenty one}, L
_{twenty two}Common smoothing inductor with larger inductance
K, capacitor C₀Is a smoothing capacitor.

(Embodiment 11) In Embodiment 9, a plurality of
In a configuration in which a group of cascaded inverter circuits are connected in parallel
However, in the present embodiment, as shown in FIG.
Multiple converters with inverter circuits connected in parallel
Road group, ie converter circuit 4₁₁, 4_{twenty one}Parallel connection group,
Converter circuit 4₁₂, 4_{twenty two}Parallel connection group,…, convertor
Data circuit 4_1n, 4 _2nAre connected in a subordinate manner.
It is a thing.

In the configuration shown in FIG. 24, the number of converter circuits in one parallel connection group is two. However, two or more converter circuits may be connected in parallel. May be connected in series. Each converter circuit 4 ₁₁ ..., 4 ₂₁ ... waveform shaping circuit 6 ₁₁ as described above ..., 6 ₂₁ ... have, thereby reducing the current flowing through the switching element 5 is shared.

[0057] Figure 25 shows a circuit embodying the configuration of FIG. 24, such a circuit configuration is a parallel connection groups of the two converter circuits 4 _11, 4 ₂₁ consisting of the step-up chopper, the two current resonance type in the converter circuit 4 _12, 4 ₂₂ that dependently connected, the converter circuit 4 _11, 4 boosts the voltage of the power supply 1 _21, the output of the two converter circuits 4 _11, 4 ₂₁ is connected in parallel a capacitor It is stored in the C _1. Converter circuit 4 ₁₂ of the current resonance type, 4 ₂₂ further power conversion capacitor C ₁ as a power source. And these converter circuits 4 _12, 4 output of ₂₂ is connected in parallel, the smoothing inductor L _0, and supplies power to the load 2 via the smoothing capacitor C _0.

The inverter circuits 4 ₁₁ , 4 ₁₂ , ₄₂₁ , and 4 ₂₂
Perform basically the same operations as the circuits corresponding to the tenth embodiment. By the way, in Embodiments 1 to 11, a DC power supply is used as the power supply 1, but any power supply or the like obtained by rectifying an AC power supply may be used.

[0059]

According to the first aspect of the present invention, power is supplied to at least one or more power supplies and at least one or more loads,
A plurality of converter circuits for adjusting power by changing the switching frequency and duty of the switching elements are provided.The converter circuits include a switching circuit and a waveform shaping circuit for shaping a current waveform at a stage before or after or both of the switching circuit and a rectifying device. In the provided power supply device, since the switching elements are shared by the plurality of converter circuits, an increase in the number of switching elements to be used can be suppressed even if the power supply apparatus is configured by a plurality of converter circuits.

According to a second aspect of the present invention, in the first aspect of the present invention, a power source is independently connected to each converter circuit, so that a corresponding power source can be supplied to the converter circuit. According to a third aspect of the present invention, in the first aspect of the present invention, the output of each converter circuit is individually connected to a load, so that each converter circuit can be independently supplied to each load.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the outputs of the respective converter circuits are connected in series or in parallel and combined and connected to a load.
The power supply can be shared by the converter circuit. According to a fifth aspect of the present invention, in the first aspect of the present invention, the current flowing through the switching element, which is a share of the power supplied to the load and the current flowing to each converter circuit determined by the waveform shaping circuit of each converter circuit, Of the combined current of at least the shared switching element, based on the sum calculated from the sum of the maximum value of the switching element during the ON period / the average value of the switching element during the ON period, (the maximum value during the ON period of the switching element / the switching element). The current waveform of each converter circuit is set so as to reduce the value calculated from the average value during the ON period of the switching circuit, so that the conduction loss, the resistance of the switching element, and the switching loss can be reduced. According to a sixth aspect of the present invention, in the first aspect of the present invention, a value obtained from (maximum value / average value in the ON period of the switching element) of the combined current of each converter circuit flowing through the switching element is smaller than 2. The current waveform of each converter circuit is set to
According to the first aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing through one converter circuit is different from the generation point of the maximum value of the current waveform of the current flowing through the other converter circuit. According to an eighth aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing in at least one converter circuit is near the generation point of the minimum value of the current waveform of the current flowing in the other converter circuit. According to the ninth aspect of the present invention, in the first aspect of the present invention, the generation point of the maximum value of the current waveform of the current flowing in at least one converter circuit is minimized by the minimum value of the current waveform of the current flowing in the other converter circuit. Since the value is set to be near the point of occurrence of the value, the invention of claim 10 further flows through at least one converter circuit in the invention of claim 1. The section where the average current between the local maximum value of the current waveform of the current and the two local minimum values is the largest is the maximum value of the average current of the current waveform of the current flowing to the other converter circuit and the average current between the two local minimum values. Since the current waveform is set differently from the large section, the invention of claim 11
According to the first aspect of the present invention, the current waveform of the current flowing through at least one converter circuit is prevented from reaching a maximum value when the switching element is turned off, so that the same effect as the fifth aspect of the invention can be obtained.

According to a twelfth aspect of the present invention, in the first aspect of the invention, at least one converter circuit supplies a substantially sinusoidal current to the shared switching element. In the two or more converter circuits, the substantially sinusoidal current flows through the shared switching element, and at least the time point at which the maximum value of the substantially sinusoidal current flows into one of the converter circuits is substantially sinusoidal flowing into another converter circuit. Since the wave current is set to be different from the maximum value, the invention of claim 14
In the invention according to claim 12, the two or more converter circuits flow a substantially sinusoidal current through the shared switching element, and at least the maximum value and the period of the substantially sinusoidal current flowing into one of the converter circuits are other converters. Since the setting is made so as to be different from the maximum value and the period of the substantially sinusoidal current flowing into the circuit, the same effect as the invention of claim 5 can be obtained.

According to a fifteenth aspect, in the first aspect, a resonance circuit is used for the waveform shaping circuit of at least one converter circuit. A resonance circuit is used as a waveform shaping circuit of one or more converter circuits, and at least one of the resonance currents flowing into the converter circuit is set so that the time when the maximum value is different from the time when the other resonance currents have the maximum value. Therefore, according to a seventeenth aspect of the present invention, in the fifteenth aspect, a resonance circuit is used as a waveform shaping circuit of two or more converter circuits, and at least one of the resonance currents flowing into the converter circuits has a maximum value and resonance frequency Since the period is set so as to be different from the maximum value of the other resonance currents and the resonance period, the same effect as the invention of claim 5 can be obtained.

[Brief description of the drawings]

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

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

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

FIG. 4 is a specific circuit diagram according to a second embodiment of the present invention.

FIG. 5 is a waveform chart for explaining the operation of the above.

FIG. 6 is a specific circuit diagram according to a third embodiment of the present invention.

FIG. 7 is a waveform diagram for explaining the operation of the above.

FIG. 8 is a waveform chart for comparative explanation of the above.

FIG. 9 is a specific circuit diagram of Embodiment 4 of the present invention.

FIG. 10 is a waveform chart for explaining the operation of the above.

FIG. 11 is a specific circuit diagram according to a fifth embodiment of the present invention.

FIG. 12 is a waveform diagram for explaining the operation of the above.

FIG. 13 is a waveform chart for comparative explanation of the above.

FIG. 14 is a specific circuit diagram of another example of the above.

FIG. 15 is a circuit configuration diagram according to a sixth embodiment of the present invention.

FIG. 16 is a specific circuit diagram of the above.

FIG. 17 is a specific circuit diagram according to a sixth embodiment of the present invention.

FIG. 18 is a circuit configuration diagram according to a seventh embodiment of the present invention.

FIG. 19 is a specific circuit diagram of Embodiment 8 of the present invention.

FIG. 20 is a circuit configuration diagram according to a ninth embodiment of the present invention.

FIG. 21 is a specific circuit diagram of the above.

FIG. 22 is a circuit configuration diagram according to a tenth embodiment of the present invention.

FIG. 23 is a specific circuit diagram of the above.

FIG. 24 is a circuit configuration diagram according to Embodiment 11 of the present invention.

FIG. 25 is a specific circuit diagram of the above.

FIG. 26 is a circuit diagram of a conventional example.

FIG. 27 is a waveform chart for explaining the operation of the above.

FIG. 28 is a circuit configuration diagram of another conventional example.

FIG. 29 is a circuit configuration diagram of another conventional example.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 power supply 2 load 3 power supply device 4 ₁ … converter circuit 5 switching element 6 ₁ … waveform shaping circuit 7 ₁ … rectifier element

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiro Nakamura 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (19)

[Claims] 1. A converter circuit comprising: at least one or more power supplies; and a plurality of converter circuits for supplying power to at least one or more loads and adjusting power by changing a switching frequency and a duty of a switching element. In a power supply device provided with a switching circuit, a waveform shaping circuit for shaping a current waveform at a preceding stage and / or a subsequent stage thereof, and a rectifying device, a switching device is shared by a plurality of converter circuits. 2. The power supply device according to claim 1, wherein a power supply is independently connected to each converter circuit. 3. The power supply device according to claim 1, wherein the output of each converter circuit is separately connected to a load. 4. The power supply device according to claim 1, wherein the outputs of the converter circuits are connected in series or in parallel to be combined and connected to a load. 5. A current flowing through a switching element, which is a share of a power supplied to a load and a current flowing through each converter circuit determined by a waveform shaping circuit of each converter circuit,
(Sum of the maximum value during the ON period of the switching element /
From the value calculated from the sum of the average values of the switching elements during the ON period, at least the combined current of the shared switching elements is calculated from (maximum value of the switching elements during the ON period / average value of the switching elements during the ON period). 2. The power supply device according to claim 1, wherein the current waveform of each converter circuit is set so that the value to be obtained is small. 6. A current waveform of each converter circuit is set such that a value obtained from (maximum value / average value during the ON period of the switching element) of a combined current of each converter circuit flowing through the switching element is smaller than 2. The power supply device according to claim 1, wherein the power supply device is formed. 7. The method according to claim 1, wherein the generation point of the maximum value of the current waveform of the current flowing in one converter circuit is different from the generation point of the maximum value of the current waveform of the current flowing in the other converter circuit. 2. The power supply device according to 1. 8. The time of occurrence of the maximum value of the current waveform of the current flowing through at least one converter circuit is different from the time of occurrence of the maximum value of the current waveform of the current flowing through another converter circuit. Item 7. The power supply according to Item 1. 9. The method according to claim 9, wherein the generation point of the maximum value of the current waveform of the current flowing through at least one converter circuit is close to the generation point of the minimum value of the current waveform of the current flowing through another converter circuit. The power supply device according to claim 1. 10. A section where the maximum value of the current waveform of the current flowing through at least one converter circuit and the average current between two adjacent minimum values are the maximum value of the current waveform of the current flowing in another converter circuit. 2. The power supply device according to claim 1, wherein the current waveform is set so as to be different from a section in which the average current between two adjacent minimum values is the largest. 11. The power supply device according to claim 1, wherein a current waveform of a current flowing through at least one converter circuit does not reach a maximum value when the switching element is turned off. 12. The power supply device according to claim 1, wherein at least one converter circuit supplies a substantially sinusoidal current to a shared switching element. 13. The two or more converter circuits pass a substantially sinusoidal current to the shared switching element, and at least the maximum value of the substantially sinusoidal current flowing into one of the converter circuits is applied to another converter circuit. 13. The power supply device according to claim 12, wherein the power supply device is set so as to be different from a time point at which the flowing sine wave current has a maximum value. 14. The two or more converter circuits flow a substantially sinusoidal current to the shared switching element, and at least the maximum value and cycle of the substantially sinusoidal current flowing into one of the converter circuits are set to other converter circuits. 13. The power supply device according to claim 12, wherein the power supply device is set so as to be different from a maximum value and a cycle of the flowing substantially sinusoidal current. 15. The circuit according to claim 1, wherein a resonance circuit is used as a waveform shaping circuit of at least one converter circuit.
The power supply as described. 16. A resonance circuit is used as a waveform shaping circuit of two or more converter circuits, and a point in time at which at least one of the resonance currents flowing into the converter circuits has the maximum value is a point in time at which the other resonance currents have the maximum value. The power supply device according to claim 15, wherein the power supply device is set to be different from the power supply device. 17. A resonant circuit is used as a waveform shaping circuit of two or more converter circuits, and at least one of the resonant currents flowing into the converter circuit has a maximum value and a resonance period, and a resonance value and a maximum value of another resonance current. The power supply device according to claim 15, wherein the period is set to be different from the period. 18. At least one converter circuit is provided with a waveform shaping circuit such that a converter current flowing from a shared switching element has a monotonically increasing current waveform.
The power supply device according to claim 1, wherein a resonance circuit is used as a waveform shaping circuit of at least one converter circuit. 19. The power supply according to claim 1, wherein at least one converter circuit is cascaded to be an input of at least one other converter circuit.