JPH05300729A - Power supply circuit - Google Patents

Abstract

PURPOSE:To prevent the heat generation of a diode by equipping a first switching circuit, which is serially connected with a DC power supply during a period for storing power in driving power supply parts to individually separate respective driving power supply parts at the time of supplying driving circuits with power. CONSTITUTION:In respective driving power supply parts 31-34, diodes D21-D24 are connected between mutual output lines and the common line of the driving power supply parts 3 provided a step higher and respective diodes D21-D24, are connected to a polarity where they are conducted when transistors Q7, Q8 are ON. Therefore, when the control signal V1 of a control circuit l its at a high level and the transistors Q7, Q8 are ON, capacitors C4-C7 charged in series. Then, when the control signal V1 is at a low level, the transistors Q7, Q6 are turned OFF and respective driving power supply parts 31-34 are connected to a state, where power can be supplied to corresponding driving circuits 21-24, and are separated by the diodes D21-D23. As a result, a circuit efficiency can be improved and any trouble caused by the heat generation of the diodes can also be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connecting a plurality of energy storage elements such as capacitors and coils to a DC power source to store energy by turning on and off a plurality of switching elements, and then to the energy storage elements. The present invention relates to a power supply circuit which transfers stored energy to another energy storage element and obtains an output voltage obtained by stepping down the power supply voltage of a DC power supply.

[0002]

2. Description of the Related Art A conventional power supply circuit of this type is shown in FIG.
You This power circuit is composed of a plurality of capacitors C₁~ C₃Straight
Current source V_INConnected in series to charge, and after charging,
Densa C ₁~ C₃Output capacitor C₈Connected in parallel to
Output capacitor C₈To charge the DC power supply V_INThe voltage of
It is converted into a stepped down DC power.

More specifically, the capacitors C _{1 to} C ₃ are series-charged by the DC power source V _IN , so that each capacitor C ₁
~ C ₃ is charged with a partial pressure ratio corresponding to each capacity. In this case, the charged charges of the capacitors C _{1 to} C ₃ are the DC power source V _IN
Since the stepped down until divided voltage, when charging the output capacitor C ₈ connected in parallel to respective capacitors C ₁ -C ₃ to the output capacitor C _8, the output capacitor C ₈ than the DC power source V _IN It is charged up to a voltage reduced to a low voltage.

Here, the capacitor C₁~ C₃And direct current
Power supply V_INAnd output capacitor C₈To switch connection with
Number of switching elements, transistor Q₁~ Q₆
And diode D₁~ D₆Is used. However, the switch
It is not necessary for the ching element to be a transistor.
Instead, it may be an FET or the like. Switching element
The configuration of the circuit configured by the child will be specifically described. Each of the above
Capacitor C₁~ C₃DC power supply V_INConnected in series to
The succeeding circuit parts are transistor Q₁~ Q₃And die
Aether D₁~ D₃It is composed of. For example, a capacitor
C₁Regarding the diode D₁And transistor Q₁When
Are connected in series, and each series circuit is a DC power supply V_INAgainst
And are connected in series. Therefore, all transitions
Star Q₁~ Q₃When the capacitor is on, the capacitor C₁~ C₃
DC power supply V _INAre connected in series.

Each capacitor C₁~ C₃Output capacitor
C₈The circuit connected in parallel to_Four~ Q
₆And diode D_Four~ D₆It is composed of. For example,
Capacitor C₁Is the transistor Q_FourAnd diode
D_Four, D₆Output capacitor C via₈Connected in parallel to
Capacitor C₂Is the transistor Q_FiveAnd diode
D_Five, D₆Through the capacitor C₃Is a transition
Star Q₆And diode D₆Output capacitor C via
₈Are connected in parallel. That is, all the Transis
Q_Four~ Q₆Is on, capacitor C₁~ C₃Is
Output capacitor C respectively ₈Will be connected in parallel.

[0006] On the respective transistors Q ₁ to Q _6, OFF control, the control circuit 1 is performed through the driving circuit 2 ₁ to 2 _6. Here, since the transistors Q _{1 to} Q ₆ need to be biased at different potentials, in the case of this power supply circuit, the drive circuits 2 ₁ to ₂₆ are connected to each other as shown in FIG.
Current mirror circuit 4 including transistors Qa and Qb
₁ , a current mirror circuit 4 ₂ including transistors Qc and Qd, a buffer B, and resistors Ra and Rb. That is, the control signal is a voltage signal applied via resistor Ra from the control circuit 1, a current mirror circuit 4 ₁
In it converted into a current signal, delivered to the converted current signal to the current mirror circuit 4 _2, and outputs the converted voltage signal to the current signal at resistor Rb. Since the terminal c of the drive circuit 2 is connected to the emitter of the transistor Q, the base of the transistor Q is
The control signal of the control circuit 1 is applied between the emitters. The terminal a of each drive circuit 2 is connected to the output of the drive power supply unit 3 described later, the terminal b is connected to the base of the transistor Q, and the terminal c is connected to the transistor Q as described above.
Is connected to the emitter of the control circuit 1 (this emitter is connected to the common line of the driving power supply unit 3).
Is connected to the output terminal (control signals V ₂ and V ₂ are output from the output terminal), and the terminal e is connected to the negative electrode of the DC power supply V _IN .

Further, as described above, each transistor Q ₁
Since ~ Q ₆ needs to be operated at different potentials,
Driving power supply units 3 _{1 to} 3 ₄ are provided to drive the respective transistors Q _{1 to} Q ₆ . Here, regarding the transistors Q _{4 to} Q ₆ , at the time of supplying drive power,
Since the respective transistors Q _{4 to} Q ₆ are operated at the same potential, the drive power source section 3 ₄ is used in common.

Each driving power source unit 3₁~ 3_FourIs the resistance R₁
~ R_Four, Capacitor C_Four~ C₇And Zener diode D
₁₁~ D₁₄It is composed of. For example, the drive power supply unit 3₁Related
Then, the resistance R₁, Capacitor C_FourAnd Zena Daio
De D₁₁It is composed of. That is, the capacitor C_Four~ C₇
Zener diode D is used as the power source₁₁~ D ₁₄
Drive circuit 2₁~ 2₆Will supply to
Growling.

The capacitors C _{4 to} C ₇ are charged before the transistors Q _{1 to} Q ₆ are turned on (before power conversion), and the transistors Q ₇ and Q ₇ are charged for this charging. ₈ , diode D ₁₀ and resistors R ₅ , R ₆
Is provided. That is, turns on the transistor Q _7, Q _8, via the diode D _10, the driving power source 3 ₁ -
3 ₄ is connected in series to the DC power supply V _IN . The control circuit 1 controls ON / OFF of the transistors Q ₇ and Q ₈ .

The operation of the power supply circuit will be described below with reference to FIG.
And explain. Now time t₀It's shown in Figure 14 (a).
Control signal V of control circuit 1₁Becomes high level,
Transistor Q₇, Q₈Turns on, which drives
Power supply 3₁~ 3_FourDC power supply V_INAre connected in series.
Therefore, each drive power source unit 3₁~ 3_FourCapacitor C _Four
~ C₇Is charged.

During the period from time t ₁ to time t ₂ , the control signal V ₁ of the control circuit 1 becomes low level as shown in FIG. 14 (a). In this period, the state of charge of the capacitor C ₄ -C ₇ as shown in FIG. (J) ~ (m) is maintained. However, since the time point at which electric power is supplied from the drive power supply unit 3 ₄ to the drive circuits 2 ₄ to ₂₆ is the time t ₄ after that, FIG.
As shown in (m), the state of charge of the capacitor C ₇ is t
Holds up to ₄ .

At time t ₂ , the control signal V ₂ is input to the drive circuits 2 ₁ to 2 ₃ as shown in FIG. 14 (b). Therefore, in the driving circuit 2 ₁ to 2 ₃ transistor Q ₁ to Q ₃ is turned on, the capacitor C ₁ -C _3, transistor Q ₁
Together to Q ₃ through the diode D ₁ to D ₃ DC power source V
Connected in series with _IN . Here, the capacitors C _{1 to} C
The capacity of ₃ is the same, and the power supply voltage of the DC power supply V _IN is 3E
Then, the capacitors C _{1 to} C ₃ are charged to E. Then, in the subsequent period from time t ₃ to time t ₄ , the control signal V ₂ returns to the low level as shown in FIG. 14B, and at this time, the charged states of the capacitors C _{1 to} C ₃ are maintained.

Time t_FourThen, as shown in FIG.
Drive circuit 2_Four~ 2₆Control signal V₃Is entered
Dista Q_Four~ Q₆Turns on, which causes the capacitor
C₈For each capacitor C₁~ C₃Are connected in parallel
It For example, capacitor C₁Regarding the transistor
Q_Four, Diode D₆And diode D_FourVia con
Densa C₈Connected to. Where each capacitor C₁~
C₃If the charging voltage of E is E, then capacitor C₈Up to E
Be charged. And time t_Five~ T₆Then, FIG. 14 (c)
Control signal V₃Becomes low level, and
Dista Q_Four~ Q ₆Turns off and the capacitor C₈Is con
Densa C₁~ C₃The state of being charged to E after being disconnected from
Held in. After that, by repeating the above operation,
Output voltage V_OUTDC power supply V_INIs the voltage
can get. For example, DC power supply V_INIs 3E and is a capacitor
C₁~ C₃Output voltage V_OUTage
To obtain E. .

By the way, in the above power supply circuit,
Dynamic power supply unit 3₁~ 3_FourDC power supply V_INIn series with
Connect and connect capacitor C_Four~ C₇It is configured to charge
Drive power supply unit 3₁~ 3_FourLow power consumption in
You can This point will be specifically described below. Drive above
Power supply 3₁~ 3_FourEach resistance R₁~ R_FourDC power supply V_IN
Drive located one step higher in the voltage direction (positive direction)
Power supply 3₁~ 3₂It is connected to the common line. example
For example, drive power supply unit 3₂As for the resistance R₂Drive electric
Source 3₁Common line (Zener diode D₁₁The anode of
Side). That is, the transistor Q₇, Q
₈When the power is on₁~ 3_FourDC power supply V_INTo
Each drive power supply unit 3 connected in series₁~ 3_FourCapacitor C
_Four~ C₇Is charged. More specifically, DC power supply V_IN,
Transistor Q ₇, Resistance R₁, Capacitor C_Four, Resistance R
₂, Capacitor C_Five,,, capacitor C ₇,diode
D_Ten, Transistor Q₈, DC power supply V_INIn the route of each
C Densa C_Four~ C₇Is charged. However, the driving power supply unit 3
₁~ 3_FourOutput voltage (Zener diode D₁₁~ D₁₄Notsu
Voltage, which is equivalent to the
Source V_INIt is necessary to set below the power supply voltage of.

Here, in the case of the above power supply circuit, the drive power is
Source part 3₁~ 3_FourSince they are connected in series,
As shown in FIG. 15, a DC power source V_INPower supply voltage 3E
, Capacitor C₁~ C₃The voltage (V
_C4~ V_C7) Addition value (V_C4+ V _C5+ ... + V_C7) Deducted
The voltage that has been₁~ R_FourValue of voltage drop (V
_R1+ V_R2+ ... + V_R4)And it is sufficient. Therefore, the drive power supply
Part 3₁~ 3_FourDC power supply V_INIndividually connected to (parallel connection)
Each resistance R₁~ R_FourIn
Power consumption can be reduced.

[0016]

By the way, the reason why the diodes D _{1 to} D ₃ are provided in the power supply circuit is as follows. For example, regarding the transistor Q ₂ in FIG. 12, a reverse voltage, which is the potential difference between the voltage V _C1 across the capacitor C ₁ and the voltage V _C5 across the capacitor C ₅ , is applied to the transistor Q ₂ . Therefore, a diode D ₁ is provided to prevent the reverse voltage from being applied to the transistor Q ₂ . This is transistor Q ₃ ~
The same is true with respect to Q _6, is provided a diode D ₁ to D ₃ in the transistor Q ₃ to Q ₆ in the reverse voltage of each is prevented from being applied. Further, in the case where the transistors Q _{1 to} Q ₃ are FETs having a characteristic that currents flow bidirectionally, the charge charges of the capacitors C _{1 to} C ₃ are prevented from being consumed by the driving power supply units 3 _{1 to} 3 _3. There is a reason.

However, the above diodes D _{1 to} D ₃
When the current is increased for the power conversion, the loss of the forward voltage drop of the diodes D _{1 to} D ₃ causes a decrease in the efficiency of the circuit and causes a problem of heat generation. The present invention has been made in view of the above points, and an object of the present invention is to eliminate the need for a diode inserted in series with the first energy storage element and to provide a large current for power conversion. It is an object of the present invention to provide a power supply circuit capable of eliminating the loss due to the forward voltage drop of the diode, improving the circuit efficiency, and preventing the problem due to the heat generation of the diode.

[0018]

In order to achieve the above object, the present invention provides a direct current power source including a pulsating current power source, a plurality of first energy storage elements such as capacitors and coils, and these first energy sources. Second, energy is transferred from the storage element and stored, and the stored energy is taken out as an output.
Energy storage element and the first energy storage element are connected to a DC power source to store energy, and then the energy stored in these first energy storage elements is transferred to the second energy storage element.
A plurality of switching elements that perform connection switching for transferring to the energy storage element, a drive circuit that turns on and off each of these switching elements, and the DC power supply during a period excluding the energy storage period in the first energy storage element. The drive power supply unit that stores the power supplied from each of the above-mentioned drive circuits and the drive power supply unit is connected in series to the DC power supply during the period when the power is stored in the drive power supply unit. And a first switch circuit for individually disconnecting the driving power supply unit.

During the period in which electric power is stored in the drive power source section,
In order to prevent the electric charge charged in the capacitor for power conversion from being wasted, it is detected that the energy amount of the first energy storage element is lower than the energy amount of the drive power source unit, and the first energy storage is detected. A second switch circuit is provided to shut off the loop in which the energy of the device is released to the driving power supply unit.

When the total output voltage of the drive power supply unit exceeds the voltage of the DC power supply, the drive power supply units whose total output voltage is within the power supply voltage of the DC power supply are connected in series, and the total number of output voltage exceeds the DC power supply voltage. Connect the drive power supply section in series,
The respective series circuits of the driving power supply units may be connected in parallel.

[0021]

The present invention has the above-mentioned configuration,
The first switch circuit is provided with the function of a diode that prevents a reverse voltage applied to the switching element that connects the first energy storage element to the DC power supply, and a diode inserted in series with the first energy storage element is unnecessary. Thus, the loss due to the forward voltage drop of the diode when the current for power conversion is large is eliminated, the circuit efficiency is improved, and the problem due to the heat generation of the diode is prevented.

[0022]

(Embodiment 1) FIGS. 1 and 2 show an embodiment of the present invention. The configuration of this embodiment is basically the same as that of the conventional circuit of FIG. 12 described above as shown in FIG. 1, and in this embodiment, the DC power supply V _IN of the drive power supply units 3 _{1 to} 3 ₄ and the drive circuit. it is characterized in connection with the 2 ₁ to 2 _6. Therefore, in the following description, the same components as those in FIG. 12 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the case of the present embodiment, each drive power source unit 3 _{1 to} 3
₄ are connected in the reverse order to the case of FIG. 12 with respect to the voltage direction of the DC power supply V _IN , and a resistor R is provided between each output line and the common line of the driving power supply unit 3 provided one step above. Instead of _{1 to} R ₄ , diodes D _{21 to} D ₂₄ are connected. Each diode D ₂₁ to D ₂₄ is is connected to the polarity which conducts during on of the transistor Q _7, Q _8.
Therefore, the control signal V ₁ of the control circuit 1 is at a high level, during on of the transistor Q _7, Q _8, the capacitor C ₄ -C ₇ as in the case of FIG. 12 are serially charged. Therefore, also in the case of the present embodiment, it is possible to reduce the power consumption in the drive power supply units 3 _{1 to} 3 ₄ . In addition, each driving power supply unit 3 _{1 to} 3
Total _fourth output voltage (equivalent Zener voltage of the Zener diode D ₁₁ to D ₁₄ and) has is set lower than the power supply voltage of the DC power source V _IN.

At this time, the capacitor C₁Charging power
Diode D with load_{twenty four}And resistance R₇Through the transistor
Q₈A current flow path is formed in the
To prevent, diode D_{twenty four}And capacitor C_FourContact
Continuation point and capacitor C₁And transistor Q₁Connection point of
Between transistor Q₉Is provided. The resistance R
₈, R₉Is the transistor Q₉Is the bias resistance of. This
Transistor Q₉Is the diode D_{twenty four}When is on
The current flowing in the above path is blocked and the capacitor
C₁To prevent unnecessary discharge. Also other drives
Power supply 3₂~ 3 _FourCommon line and capacitor C₈, C
₃, C₂Diode D between_{twenty five}~ D₂₇Set up the
Sensor C₈, C₃, C₂Prevents the charging charge of the
It has stopped. Where capacitor C₈To capacitor C
₇, Capacitor C₃To capacitor C₆, Capacitor C
₂To capacitor C_FiveThe path to is capacitor C_Five~ C
₇Has a higher potential, diode D_{twenty five}~ D₂₇At the current
Is blocked.

[0025] Then, control signal V ₁ of the control circuit 1 becomes low level, the transistors Q _7, Q ₈ are turned off. At this time, the circuit of FIG. 1 is in the connection state shown in FIG. 2, and the drive power supply units 3 _{1 to} 3 ₄ are connected to the corresponding drive circuits 2 ₁ to 3 _4.
Is connected to the ready supply power to 2 ₄ are separated by diodes D ₂₁ to D _23. That is, the drive power supply units 3 _{1 to} 3 ₄ are connected in the reverse order with respect to the voltage direction of the DC power supply V _IN , and the output lines of them are connected to the common line of the drive power supply unit 3 provided one step above. during, because is connected a diode D ₂₁ to D _23, the diode D ₂₁ ~
As shown in FIG. 2, D ₂₃ is in a state of being inserted so that a reverse voltage corresponding to the potential difference between the capacitors C _{1 to} C ₃ and the capacitors C _{5 to} C ₇ is not applied to the transistors Q _{2 to} Q ₆ . Therefore, it prevents the reverse voltage is applied to the transistor Q ₂ to Q _6. That is, the diodes D _{21 to} D ₂₃ are shown in FIG.
2 functions as the diodes D _{1 to} D ₃ . In this case, the diodes D _{21 to} D ₂₃ are the capacitors C for power conversion.
_Since they are not inserted in series in _{1 to} C ₃ , the efficiency does not decrease when the power conversion current increases, and the problem of heat generation does not occur.

(Embodiment 2) FIG. 3 shows another embodiment of the present invention.
Show. In this embodiment, the diode D of the above-mentioned Embodiment 1 is used.₂₇To
Instead of transistor Q_Ten, Resistance R_Ten, R₁₁With
Is. This is the drive power supply unit 3₁~ 3_FourThen the capacitor
C_Four~ C₇DC power supply V_IN4 for (power supply voltage 3E)
Since each is connected in series, each capacitor C_Four~ C₇Charging
The voltage is less than 3E / 4, and the capacitor C₁~ C₃Charging
The voltage is E. Therefore, the transistor Q₇, Q₈of
When turned on, transistor Q_TenIf there is no
SA C ₂Charge C of the capacitor C_FourResistance while charging
R₇An electric current flows through. Therefore, this current is also cut off
In this case, as in this embodiment, the transistor Q_TenSet up
When turned off, the capacitor C₂Capacitor C than the charging voltage of
_FourIf the charging voltage of the_TenIs off
And the current path is cut off.

In other words, in this embodiment, the power supply on the side of the drive power supply unit 3 is
If the order is high, the diode (eg D_{twenty five}, D₂₆)
To interrupt the current path, and in the opposite case, a transistor (eg
If Q₉, Q_Ten), Etc. to interrupt the current path
It is a thing. (Embodiment 3) FIGS. 4 to 6 show still another embodiment of the present invention.
Indicates. In the present embodiment, the driving power supply unit 3₁~ 3_FourWhen charging
Drive a switching element with low operating potential at
It prevents the high voltage from being applied to the drive circuit.
It For example, transistor Q₇, Q₈Driving power when the
Source part 3₁~ 3_FourTransistor Q when charging_Four~
Q₆Drive circuit 2_Four~ 2₆The reference potential of is capacitor C
₈Is the charging potential of the drive circuit, that is, E, and the drive circuit 2_Four~ 2₆
The potential on the positive side of the₇Collector of
The rank is 3E. Therefore, the drive circuit 2_Four~ 2₆
Is applied with a differential voltage 2E. In particular, the power supply voltage V_INIs high
Drive circuit 2_Four~ 2₆If the voltage withstand voltage of
As shown in FIG. 4, the drive power supply unit 3_FourOutput line and drive
Circuit 2_Four~ 2 ₆Between the plus line of Fig. 5 (a) and
Alternatively, the circuit shown in (b) may be inserted.

In FIG. 5A, the marks between the lines are
When the applied voltage is high, the diode D_{twenty five}Reverse voltage is
Applied, transistor Q_{twenty three}Is turned on, and Transis
Q _{twenty two}Is on, transistor Q_{twenty one}Turns off. Obey
Then, the lines are separated from each other, whereby the drive circuit 2
_Four~ 2₆It is prevented that an overvoltage is applied to. Reverse
And transistor Q₇, Q₈Is turned off, the transition
Star Q_{twenty three}Is turned off, the transistor Q_{twenty two}Is off
And transistor Q_{twenty one}Turns on and drive circuit 2_Four~ 2
₆Drive power supply 3_FourPower is supplied from.

In the case of FIG. 5B, control of the control circuit 1
Signal V₁Using the transistor Q _{twenty four}Control on and off
Control signal V₁Is at a high level
Transistor Q₂₆Is on, transistor Q_{twenty five}Is o
F, transistor Q_{twenty four}Is off, drive circuit 2_Four~ 2₆To
The overvoltage is prevented from being applied, and the control signal V₁Is
-Level, the transistor Q₂₆Is off
Langista Q_{twenty five}Is on, transistor Q_{twenty four}Is on, drive
Circuit 2_Four~ 2₆Drive power supply 3_FourIs powered by
It Transistors in both circuits of FIGS. 5 (a) and 5 (b)
ON / OFF operation and control signal V₁Fig. 6 shows the relationship with
You

(Embodiment 4) FIGS. 7 and 8 further illustrate the present invention.
Another embodiment is shown in FIG. In this embodiment, each of the above-mentioned embodiments is DC
Power supply V_INI was performing power conversion to step down the voltage of
In this embodiment, the DC power source V_INPower to boost the voltage of
It is a conversion. Here, the condenser for power conversion
C as a service₃₀~ C₃₂Using these capacitors
C₃₀~ C₃₂DC power supply V_INParallel charge with a capacitor C
₈Capacitor C when charging₃₀~ C ₃₂Connected in series
It is designed to charge electricity.

Here, the operating potentials of the transistors Q _{11 to} Q ₁₉ are [Q ₁₉ ], [Q ₁₁ , Q ₁₃ , Q from the higher potential.
₁₅ ], [Q ₁₇ , Q ₁₈ ], and [Q ₁₂ , Q ₁₄ , Q ₁₆ ], the drive power supply units 3 _{11 to} 3 ₁₉ are connected to the DC power supply V _IN in the reverse order of the above potentials. is there. The driving power supply units 3 corresponding to the transistors Q having the same operating potential can be connected in any order. The drive power source 3 _{11-3 19} each are connected in series to a DC power source V _IN via the transistor Q _7, Q ₈ and the diode D ₅₅ to D _63.

The operation of this embodiment will be briefly described below.
At time t ₀ in FIG. 8, the control signal V ₁ becomes high level and the transistors Q ₇ and Q ₈ are turned on, so that the capacitors C ₃₃ to C are passed through the diodes D _{55 to} D _63.
41 is charged. Here, the discharge loop of the capacitor C _{8 to} the transistor Q ₈ is cut off by the transistor Q ₉ . Also, the capacitors C _{33 to} C ₄₁ and the capacitor C
The discharge loop of _{30 to} C ₃₃ is cut off by diodes D _{49 to} D ₅₄ .

At time t ₁ , the control signal V ₁ becomes low level, and at time t ₂ , the control signal V ₂ becomes high level. At this time, the driving circuit 2 _{11-2 16} transistors Q ₁₁ to Q ₁₆ is turned on, the capacitors C ₃₀ -C ₃₂ is charged to E. Here, by the action of the diode D ₅₅ to D _63, the driving power source 3 _{11-3 16} at this time it is separated.

At time t ₃ , the control signal V ₂ becomes low level, and at time t ₄ , the control signal V ₃ becomes high level,
Transistor Q ₁₇ ~Q ₁₉ is turned on. As a result, the capacitors C _{30 to} C ₃₂ are connected in series, the total voltage is applied to the capacitor C _8, and 3E is obtained as the output voltage. However, in the case of this embodiment, the voltage of the DC power supply V _IN is E.

By the way, the transistor at this point
Q₁₁~ Q₁₉The potential of the₁₉], [Q
₁₅], [Q₁₃, Q₁₈], [Q₁₁, Q₁₇], [Q₁₂，
Q₁₄, Q ₁₆] Becomes. Here, in the potential relationship,
Register Q₁₁, Q₁₈At time t₁The opposite of the case
Transistor Q₁₈Potential of transistor Q₁₁than
High potential, diode D₅₈Does not apply forward voltage
It Therefore, in FIG. 7, the drive circuit 2₁₁Figure in front of
Overvoltage prevention circuit Y in 5₁Drive circuit 2₁₁To
The high voltage is prevented from being applied. Also, the dio
Mode D₆₃Is the drive circuit 2₁₉Is the driving power source 3₁₉
Potential of the transistor Q₉When is off
In order to prevent reverse current from flowing,
It

As described above, the power supply circuit is of the boost type.
However, connect the diode in series with the power conversion capacitor.
The reverse voltage is applied to the switching element without
Can be prevented and the efficiency of the circuit cannot be reduced.
Yes. (Embodiment 5) Still another embodiment of the present invention shown in FIGS.
Here is an example: This embodiment has the same circuit as the embodiment of FIG.
This is a voltage-type power supply circuit.
Star Q₁₁~ Q₁₉Drive circuit 2 and drive power supply unit 3
Each drive unit W is
The configuration is shown in FIG. Basically, it is explained in Figure 13.
A circuit corresponding to the disclosed drive circuit 2 and described with reference to FIG.
Overvoltage protection circuit Y ₁The circuit corresponding to the
Register Q₉Drive power supply unit 3 including₁(Diode D_{twenty four}
Including,) and are integrated.

(Embodiment 6) FIG. 6 shows a case where the total output voltage of the drive power supply unit 3 is equal to or higher than the power supply voltage of the DC power supply V _IN . In this case, the total is the power supply voltage of the DC power supply V _IN . The following number of drive power supply units 3 may be connected in series, and the series circuits may be connected in parallel. Even in this case, if the drive power supply units 3 are connected in series as much as possible, the power consumption of the drive power supply units 3 can be reduced.

In the above description, the DC power supply V _IN is a DC power supply, but the present invention can be applied to a pulsating current power supply obtained by rectifying an AC power supply. Moreover, although the case where the energy storage element is a capacitor has been described in the above case, the invention can be applied to the case where the energy storage element is an inductor.

[0039]

As described above, according to the present invention, a direct current power source including a pulsating current power source, a plurality of first energy storage elements such as capacitors and coils, and energy transferred from these first energy storage elements. A second energy storage element that stores the stored energy and outputs the stored energy as an output;
A plurality of switching elements for connecting the energy storage elements to a direct current power source to store the energy and then switching the connection to transfer the energy stored in the first energy storage elements to the second energy storage element. A drive circuit for turning on and off each of these switching elements, and a drive power supply section for storing the power supplied from the DC power supply and supplying the power to each of the drive circuits during a period other than a period for storing energy in the first energy storage device. A first power supply unit is connected to the DC power supply in series during the period in which power is stored in the drive power supply unit, and each drive power supply unit is individually disconnected when power is supplied to the drive circuit.
Since the switch circuit of the first energy storage element is provided, the first switch circuit can have a function of a diode that prevents a reverse voltage applied to the switching element that connects the first energy storage element to the DC power supply. The diode inserted in series with the first energy storage element can be eliminated, the loss due to the forward voltage drop of the diode when the current for power conversion is large can be eliminated, and the circuit efficiency can be improved. It is possible to prevent problems due to heat generation in

Further, it is detected that the energy amount of the first energy storage element is lower than the energy amount of the drive power source section,
Since the second switch circuit that cuts off the loop in which the energy of the first energy storage element is released to the drive power supply unit is provided, the charge charged in the capacitor for power conversion is stored during the period when the power is stored in the drive power supply unit. It is possible to prevent wasteful consumption.

Further, when the total output voltage of the drive power supply unit exceeds the voltage of the DC power supply, the drive power supply units whose total output voltage is within the power supply voltage of the DC power supply are connected in series, and the total number of the output voltage is exceeded. When the driving power supply units are connected in series and the respective series circuits of the driving power supply units are connected in parallel,
The power consumption can be reduced for each series circuit, and the power consumption in the entire circuit can be reduced.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram showing a circuit state when a capacitor for power conversion is charged by a DC power source in the above.

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

FIG. 4 is a circuit diagram of a third embodiment.

5 (a) and 5 (b) are different specific circuit diagrams of the above-mentioned overvoltage prevention circuit.

FIG. 6 is an operation explanatory diagram of the above-mentioned overvoltage prevention circuit.

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

FIG. 8 is an operation explanatory diagram of the above.

FIG. 9 is a circuit diagram of a fifth embodiment.

FIG. 10 is a specific circuit diagram of the above drive unit.

FIG. 11 is a circuit diagram of a sixth embodiment.

FIG. 12 is a circuit diagram of a conventional example.

FIG. 13 is a specific circuit diagram of the drive circuit of the above.

FIG. 14 is an explanatory diagram of an operation of the above.

FIG. 15 is an explanatory diagram of a power consumption reduction effect of the above drive circuit.

[Explanation of symbols]

2 ₁ to 2 _6, 2 _{11-2 19} driving circuit 3 ₁ to 3 _4, 3 _{11-3 19} driving power supply unit V _IN DC power source _{C 1 ~C 3, C 30 ~C} 32 capacitor C ₈ output capacitor Q ₁ ~ Q _6, Q ₉ ~Q ₁₉ transistor _{D 21 ~D 23, D 55 ~D} 63 diode

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[Procedure amendment]

[Submission date] August 3, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

In this way, the booster type power supply circuit isOn the roadThere
Also connect the diode in series with the capacitor for power conversion
Reverse voltage is applied to the switching element without
This can be prevented, and the efficiency of the circuit will not be reduced. (Embodiment 5) Still another embodiment of the present invention shown in FIGS.
Here is an example: This embodiment has the same circuit as the embodiment of FIG.
This is a voltage-type power supply circuit.
Star Q₁₁~ Q₁₉Drive circuit 2 and drive power supply unit 3
Each drive unit W is
The configuration is shown in FIG. Basically, it is explained in Figure 13.
A circuit corresponding to the disclosed drive circuit 2 and described with reference to FIG.
Overvoltage protection circuit Y ₁The circuit corresponding to the
Register Q₉Drive power supply unit 3 including₁(Diode D_{twenty four}
Including,) and are integrated.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

(Embodiment 6) FIG. 11 shows a case where the total output voltage of the driving power supply unit 3 is equal to or higher than the power supply voltage of the DC power supply V _IN . In this case, the total is the power supply voltage of the DC power supply V _IN . The following number of drive power supply units 3 may be connected in series, and the series circuits may be connected in parallel. Even in this case, if the drive power supply units 3 are connected in series as much as possible, the power consumption of the drive power supply units 3 can be reduced.

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Claims (3)

[Claims] 1. A direct current power supply including a pulsating current power supply, a plurality of first energy storage elements such as capacitors and coils, energy transferred from these first energy storage elements and stored therein, and the stored energy is output. The second energy storage element to be taken out and the first energy storage element are connected to a DC power source to store energy, and then the energy stored in these first energy storage elements is stored in the second energy storage element. A plurality of switching elements that perform connection switching for switching to
A drive circuit that is turned off, a drive power supply unit that stores the power supplied from the DC power supply and supplies the power to each of the drive circuits during a period other than the period for storing energy in the first energy storage element,
And a first switch circuit that connects the drive power supply unit in series to a DC power supply in series during the period in which power is stored in the drive power supply unit and disconnects each drive power supply unit individually when power is supplied to the drive circuit. Characteristic power supply circuit. 2. The first energy storage element detects when the amount of energy is lower than the amount of energy of the drive power source,
2. The power supply circuit according to claim 1, further comprising a second switch circuit that shuts off a loop in which the energy of the energy storage element is discharged to the drive power supply unit. 3. When the total output voltage of the drive power supply unit exceeds the voltage of the DC power supply, the drive power supply units whose total output voltage falls within the power supply voltage of the DC power supply are connected in series, and the number of drives exceeding the drive voltage is exceeded. 3. The power supply circuit according to claim 1, wherein the power supply units are connected in series, and the series circuits of the drive power supply units are connected in parallel.