JP2654876B2 - Power supply for switching power converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply, and more particularly, to a power supply for supplying DC power to a switching power converter.

[0002]

2. Description of the Related Art In recent years, a DC-DC converter for converting DC power to DC power of different voltage or polarity by controlling on / off of a DC power by a semiconductor switch to change the ON / OFF period ratio, and an ON / OFF period ratio In addition, there is an increasing demand for inverters and other power supply devices that convert the output voltage into AC power of a desired frequency by switching the polarity of the output voltage.

Here, a conventional example of this type of power supply device will be described with reference to FIGS. Reference numeral 1 denotes a power supply device, which includes only a battery, a rectifier output, a DC-DC converter output, and other DC voltage sources. Reference numeral 20 denotes a switching power conversion device, and reference numeral 3 denotes a switching power conversion device control circuit that controls a semiconductor switch in the switching power conversion device 20. In the conventional example of this power supply device, the semiconductor switch in the conversion device 20 is forcibly turned on / off by a control signal sent from the switching power conversion device control circuit 3 and supplied from the power supply device 1 to the switching power conversion device 20. DC power to desired output power.

[0004]

Although this power supply device has advantages in that the circuit is simple and the device can be reduced in size and weight, it is difficult to turn on / off the semiconductor switch forcibly. Switching losses occur in the semiconductor switch as shown by hatching in FIG. That is, there is a period in which both the voltage V _S across the semiconductor switch and the current I _S flowing through the semiconductor switch are not zero, and power consumption always occurs there. And
At the time of power switching, a surge voltage and a current are generated due to the distributed capacitance and the distributed inductance of the semiconductor switch and the wiring, which cause radiated noise and conducted noise. In addition, it is essential to increase the switching frequency in order to reduce the size and weight of the power supply device. However, in this case, the switching loss, radiation noise, and conduction noise increase in proportion to the increase in the switching frequency. Needless to say. Therefore, the increase in the switching loss, the radiated noise and the conducted noise is a hindrance factor, and it is not possible to reduce the size and weight of the power supply device beyond a certain limit.

[0005] The present invention is to provide a power supply device that solves the above-mentioned problems.

[0006]

Power supply 10 Means for Solving the Problems] is a first circuit connecting a DC voltage source E and the semiconductor switch S ₁ to the further semiconductor switches S ₁ are connected in series with diode D ₁ in antiparallel A semiconductor switch S ₂ , a resonance reactor L, and a resonance capacitor C ₁ are connected in series, a diode D ₂ is connected to the semiconductor switch S ₂ in anti-parallel, and a semiconductor is connected to the resonance capacitor C ₁ . A second circuit having a switch S ₃ connected in parallel and a diode D ₃ connected in anti-parallel, wherein the first circuit and the second circuit are connected in parallel with each other, and the first circuit connected in parallel with each other;
Circuit and comprising a diode D ₄ connected to the resonant capacitor C ₂ and the anti-parallel and connected in parallel with a second circuit, the power supply to connect the switching power converter 20 to the resonant capacitor C ₂ both end portions In the zero voltage state of 10, the semiconductor switch of the switching power converter 20 is turned on / off.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, an outline of a power supply device including the power supply device 10 of the present invention will be described with reference to FIG. 10
Is a power supply unit of the present invention, and 40 is a power supply control circuit for controlling a semiconductor switch in the power supply unit 10. 2
Reference numeral 0 denotes a switching power conversion device for turning on / off the DC power supplied from the power supply device 10, and reference numeral 30 denotes a switching power conversion device control circuit for controlling on / off of a semiconductor switch in the switching power conversion device 20. . 50 is a zero voltage detection circuit, and 60 is a power supply output voltage detection circuit.

Here, the power supply device 10 includes a first circuit in which a DC voltage source E and a semiconductor switch S ₁ are connected in series, and a diode D ₁ is connected to the semiconductor switch S ₁ in anti-parallel. Semiconductor switch S ₂ and reactor L for resonance
Reverse and diode D ₃ in parallel semiconductor switches S ₃ with respect to the resonance capacitor C ₁ is further connected to a resonance capacitor C ₁ in series with the semiconductor switch S ₂ with connecting diode D ₂ in inverse parallel with A second circuit connected in parallel, the first circuit and the second circuit being connected in parallel with each other, and being connected in parallel with the first circuit and the second circuit connected in parallel with each other; comprises a diode D ₄ connected to the capacitor C ₂ and the anti-parallel resonance, in which the output end of the resonant capacitor C ₂ both ends.

The operation of the power supply device 10 of the present invention is shown in FIGS. 3, 3 and 4 showing the waveforms of FIG. 3 and FIG. 5 showing the operation mode of FIG. 3, and the voltage across the resonance capacitor and the current flowing through the resonance reactor are experimentally measured. This will be described with reference to FIG. 6 showing the obtained waveform. Here, the initial state of the power supply apparatus 10 of the present invention is a semiconductor switch S ₁ and S ₃ are turned on, S ₂ is off, therefore the voltage across V _{C 1} of the resonance capacitor C ₁ is zero, resonant capacitor C ₂ voltage across V _{C 2} of the voltage of the DC voltage source E, the current I _L flowing through the resonant reactor L in the state of zero. The power supply 10 takes this as an initial state and takes the following operation modes.

(Mode 1) The semiconductor switches S ₁ and S ₃ in the power supply device 10 are on and S ₂ is off, and power is supplied from the DC voltage source E to the switching power converter 20 via the semiconductor switch S _1. Mode. (Mode 2) switching power converter control circuit 30 from the power supply control circuit 40 to the supplied zero-voltage generation command pulse P _S rises to synchronize the semiconductor switch S ₂ is turned on in resonant reactor L and the resonance start current This is the mode in which I _L starts to flow.

(Mode 3) In this mode, the semiconductor switches S ₁ and S ₃ are turned off after the initial resonance current I _L starts to flow through the resonance reactor L to generate LC resonance. In this mode, the resonance reactor L
While the resonance capacitor C ₁ by the current I _L flowing through the both ends voltage V _{C 1} is charged increases, resonant capacitor C ₂ is discharged, the voltage across V _{C 2} decreases.

(Mode 4) In this mode, the discharge of the resonance capacitor C ₂ is completed, the voltage V _{C 2} across the capacitor _{C 2} becomes zero, the diode D ₄ is turned on at the same time, and the voltage V _{C 2} across the diode V ₂ is held at zero. is there. Zero voltage detection circuit 50 generates a zero voltage detection pulse P ₀ by detecting the zero voltage, the zero voltage detection pulse P ₀ is supplied to the switching power converter control circuit 30. Switching power converter control circuit 30 carries out a switching of the semiconductor switches of the switching power converter 20 in synchronization with the zero voltage detection pulse P _0. That is, when the voltage V _C2 across the resonance capacitor C ₂ which is the output voltage of the power supply device 10 is in a zero state, the switching of the semiconductor switch in the switching power conversion device 20 can be performed.

[0013] (Mode 5) after the completion of the charging of the resonance capacitor C _1, immediately, the discharge is to be initiated, in this case, the diode D ₂ since current I _L reverses through the resonant reactor L is turned on, the diode D ₄ is turned off, a mode leading to the voltage across V _{C 2} is started charging the resonant capacitor C ₂ is to increase.

(Mode 6) In this mode, the discharge of the resonance capacitor C ₁ is completed, the diode D ₃ is turned on, and the voltage V _{C 1} across the resonance capacitor C ₁ becomes zero. (Mode 7) when the voltage across V _{C 2} of the resonance capacitor C ₂ becomes equal to the voltage of the DC voltage source E rises, the diode D ₁ is the current I _L flowing through the resonant reactor L becomes ON this it is a mode for feedback to the DC voltage source E through the diode D _1. At this time, the power supply output voltage detection circuit 60 _changes the level of the power supply output voltage detection signal PE from "L" to "H", and the power supply control circuit 40 outputs the power supply output voltage detection signal P _E Semiconductor switches S ₁ and S in power supply 10 in synchronization with the rise of
₃ ON, turn off S _2. That is, the mode returns to the mode 1 and the initial state is reached when the current IL flowing through the resonance reactor _L becomes zero. Here, regarding the voltages applied to the semiconductor switches S ₁ , S ₂ , and S ₃ in the power supply device 10 when the switches are turned on and off, diodes connected in antiparallel to these switches are described. Since D ₁ , D ₂ , and D ₃ are all on, the voltages across these switches S ₁ , S ₂ , and S ₃ are all zero. Therefore, the on / off switching of the semiconductor switches S ₁ , S ₂ and S ₃ in the power supply device 10 is also performed in the zero voltage state. By the way, since the diode D ₂ is already turned on in the mode 5, the switching of the semiconductor switch S ₂ may be performed in the mode 5, and the diode D ₃ is already turned on in the mode 6. S ₃
It is needless to say that the switching may be performed in the mode 6. Note that the order of mode 6 and mode 7 may be reversed depending on the relationship between the capacitance ratios of the resonance capacitors C ₁ and C ₂ . That is, the resonance capacitor C
After the voltage across V _{C 2} of ₂ is equal to the voltage of the DC voltage source E, there is a case where the voltage across V _{C 1} of the resonance capacitor C ₁ becomes zero, in this case the diode D ₁ and D
₃ is on, so that the on / off switching of the semiconductor switches S ₁ , S ₂ and S ₃ is still performed in the zero voltage state. Operation of in response to the repetition of switching power converter control circuit 30 from the power supply control zero voltage generation command is supplied to the circuit 40 the pulse P _S mode 1 to mode 7 is repeated.

Next, FIGS. 7 and 8 show the use of the power supply device 10 of the present invention in a pulse width modulation (PWM) inverter.
This will be described with reference to FIG. This PWM inverter includes a power supply 10, a power supply control circuit 40, a PWM inverter main circuit 200, a PWM inverter control circuit 300, a zero voltage detection circuit 50, a power supply output voltage detection circuit 60, and a low-pass filter 70. Here, the PWM inverter control circuit 300 includes a reference oscillator 301, a PWM signal generation circuit 302, a synchronous PWM signal generation circuit 303, a zero voltage generation command pulse generation circuit 304, a semiconductor switch determination logic circuit 305, a positive / negative signal generation circuit 306, and a semiconductor switch. The driving circuit 307 is used. Power supply control circuit 4
0 is a semiconductor switch switching logic circuit 41 and a driving circuit 4
2. The PWM signal generation circuit 302 includes a sine wave generator 302-1 and a carrier triangular wave generator 302-
2. It is composed of a comparator 302-3.

Here, the operation of the PWM inverter will be described.
This will be described with reference to the waveform of FIG. Same as reference oscillator 301
Reference sine output from the expected sine wave generator 302-1
Wave V ₁And output from the carrier triangular wave generator 302-2.
V_TwoAre compared in a comparator 302-3, and a sine wave
PWM signal V having a pulse width proportional to the amplitude of_ThreeDepart
Live. This PWM signal V_ThreeRise and fall
The zero voltage generation command pulse generation circuit 304
From zero voltage generation command pulse P_SOccurs and the power supply control
It is supplied to the road 40. Here, the zero voltage generation command pulse P
_SIs the zero-voltage generation command pulse P in FIG.
_SNeedless to say, this is equivalent to FIG.
(D) is shown in a compressed form, which is also shown in FIG.
V_{C 2}It corresponds to. Power supply control circuit 40
In the semiconductor switch switching logic circuit 41 inside,
This zero voltage generation command pulse P_SAs described above by
Semiconductor switch S in power supply 10 according to the sequence
₁, S_Two, S_ThreeGenerates a signal to turn on / off the
Semiconductor switch via the drive circuit 42 based on the signal of
S₁, S_Two, S_ThreeAre driven on and off. one
The output voltage V of the power supply 10_{C 2}Becomes zero, zero current
The pressure detection circuit 50 outputs a zero voltage detection pulse P₀And PW
Synchronous PWM signal generation time in M inverter control circuit 300
Path 303 where the zero voltage detection pulse P
₀Synchronous PWM signal V synchronized with_FourOccurs. This zero current
Pressure detection pulse P₀Is also shown in a compressed form in FIG.
Despite this, P in FIG.₀It corresponds to. Previous
In the embodiment, the zero voltage detection pulse P₀In sync with
Switching off the semiconductor switch in the switching power converter 20
The replacement is performed immediately, but in this example, the output
Since it is necessary to reverse the polarity of the
Luth P₀First, the synchronous PWM signal
V_Four, And this is connected to the semiconductor switch decision logic circuit 30.
Enter 5. In the semiconductor switch decision logic circuit 305
The synchronous PWM signal V_FourIs "L" level,
Output voltage V of power supply device 10_{C 2}And PWM inverter
Without passing through the circuit 200, the output side current is
Refluxed through the semiconductor switch of the barter main circuit 200
In the mode A, the PWM inverter main circuit 200 is controlled.
The control switch is operated via the semiconductor switch driving circuit 307.
Let it work. Synchronous PWM signal V_FourIs "H" level
Positive / negative signal V_FiveIs the "H" level indicating the positive direction
The output voltage V of the power supply 10_{C 2}Switch the polarity of
Pass through the PWM inverter main circuit 200 without performing
Mode B that outputs power with positive polarity
The control switch of the PWM inverter main circuit 200 by half.
The operation is performed via the conductor switch drive circuit 307. Sync
PWM signal V_FourIs "H" level and positive / negative signal
V_FiveIs "L" level indicating the negative direction, the power supply device 1
0 output voltage V_{C 2}Switch the polarity of PWM inversion
Having a negative polarity to pass through the main circuit 200.
PWM inverter main circuit as mode C to output force
200 control switches to the semiconductor switch drive circuit 307
To work through. Synchronize these modes A to C
PWM signal V_FourAnd positive / negative signal V_FiveBased on
The PWM inverter main circuit
The output waveform of 200 is V_{OU T}And this voltage V_OUTIs low
The low-pass filter 70
It becomes AC voltage.

[0017]

As described above, the power supply device of the present invention is described.
The device 10 includes a DC voltage source E and a semiconductor switch S.₁And in series
Connected to the semiconductor switch S₁Diode D₁To
A semiconductor switch comprising a first circuit connected in anti-parallel;
S_Two, Resonance reactor L and resonance capacitor C₁And
Connect in series and switch S_TwoDiode D
_TwoAre connected in anti-parallel and the resonance capacitor C₁To
And semiconductor switch S_ThreeIn parallel and the diode D_Three
Are connected in anti-parallel to each other, and the first circuit and
The second circuit is connected in parallel with each other,
The first circuit and the second circuit connected in parallel are connected in parallel.
Resonant capacitor C_TwoAnd a diode connected in anti-parallel
Code D_FourAnd a resonance capacitor C_TwoSui on both ends
The switching power converter 20 is connected to
In the voltage state, half of the switching power conversion device 20
With a configuration that turns on and off the conductor switch,
Switch caused by semiconductor switch on / off switching
Greatly suppresses the generation of switching loss, radiated noise and conducted noise
Things. Then, a half of the power supply device 10 itself is provided.
The on / off switching of the conductor switch is also zero voltage state
Can all be implemented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional example of a power supply device for a switching power conversion device.

FIG. 2 is a diagram showing operation waveforms of the power supply device for a switching power converter shown in FIG.

FIG. 3 is a diagram showing a power supply device for a switching power conversion device according to the present invention.

FIG. 4 is a diagram showing operation waveforms of the power supply device for a switching power conversion device of the present invention shown in FIG. 3;

FIG. 5 is a diagram for explaining an operation mode of the power supply device for a switching power conversion device of the present invention shown in FIG. 3;

FIG. 6 shows voltages V _C1 and V across the resonance capacitor.
_{C 2,} shows a waveform obtained by experiments on the current I _L flowing through the resonance reactor.

FIG. 7 is a diagram showing an application example of a power supply device for a switching power converter according to the present invention.

FIG. 8 is a diagram showing operation waveforms of the application example of FIG. 7;

[Explanation of symbols]

Reference Signs List 10 power supply device E DC voltage source S ₁ first semiconductor switch D ₁ first diode S ₂ second semiconductor switch L resonance reactor C ₁ first resonance capacitor D ₂ second diode S ₃ third Semiconductor switch D ₃ Third diode C ₂ Second resonance capacitor D ₄ Fourth diode 20 Switching power converter 30 Switching power converter control circuit 40 Power supply control circuit 50 Zero voltage detection circuit 60 Power supply output voltage detection Circuit 70 Low-pass filter 200 PWM inverter main circuit 300 PWM inverter control circuit

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yosuke Nozaki 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-62-506128 (JP, A) JP-A Sho 64-43062 (JP, A) JP-A-58-222321 (JP, A)

Claims (4)

(57) [Claims] A first circuit in which a DC voltage source and a first semiconductor switch are connected in series, and a first diode is connected to the first semiconductor switch in anti-parallel; A switch, a resonance reactor, and a first resonance capacitor are connected in series, a second diode is connected in anti-parallel to a second semiconductor switch, and a third semiconductor is connected to the first resonance capacitor. A second circuit having switches connected in parallel and a third diode connected in anti-parallel, the first circuit and the second circuit being connected in parallel with each other, and the first circuit being connected in parallel with each other; A second resonance capacitor connected in parallel with the second circuit and a second diode, and a fourth diode connected in anti-parallel, and both ends of the second resonance capacitor are connected to a switching power converter. When Power supply for switching power converters. 2. The power supply device for a switching power conversion device according to claim 1, wherein the first semiconductor switch and the third semiconductor switch are turned on and the second semiconductor switch is turned off during power supply. As a result, an initial state in which the voltage of the first resonance capacitor is zero, the voltage across the second resonance capacitor is equal to the voltage of the DC voltage source, and the current flowing through the resonance reactor is zero, and power is realized. A voltage is applied to the switching power converter from the DC voltage source via the first semiconductor switch.
After turning on all of the third semiconductor switches and setting a period for supplying the resonance initial current to the resonance reactor, and then turning off the first semiconductor switch and the third semiconductor switch, the second resonance capacitor is turned off. A power supply device for a switching power conversion device, wherein a period in which both ends of the voltage is zero is generated, and a semiconductor switch in the switching power conversion device is switched in synchronization with the period in which the both ends of the voltage is zero. 3. The switching power converter according to claim 2, wherein the first to third diodes are turned on after the semiconductor switch in the switching power converter is switched. First
When the voltage across the third semiconductor switch becomes zero, the first semiconductor switch and the third semiconductor switch are turned on and the second semiconductor switch is turned off to return to the initial state. A power supply device for a switching power conversion device. 4. The switching power converter according to claim 3, wherein the first semiconductor switch is turned off when the first diode is turned on, and the second semiconductor switch is turned off when the second diode is turned on. A power supply device for a switching power converter, wherein the switch is turned off and the third semiconductor switch is turned off when the third diode is turned on.