JP3127358B2 - Switching circuit and resonance type power conversion circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0010]

The first to fifth inventions can increase the number of controllable switching means to be combined.
The present invention relates to a switching circuit that is capable of switching (= switching) an output voltage, which is directly connected to a plurality of stages. Sixth
The present invention relates to a self-oscillation type resonance power conversion circuit using the fifth invention. In addition, the switching action is “for example, outputting a predetermined DC voltage, outputting zero voltage (in an ideal case) in a conductive state, that is, causing a short circuit state”.
Or "for example, outputting a first predetermined DC voltage,
Or outputting a second predetermined DC voltage. " Further, the first invention can be used not only for the power conversion circuit but also for the output unit of the logic circuit.

[0020]

[Background Art] Self-turn-off function (= self-extinguishing function)
FIGS. 2 to 15 show a conventional switching circuit for switching an output voltage or a switching circuit derived therefrom, using controllable switching means having the following. Transistors 24, 6, 28, GTO thyristors 36, 3
7. “Equivalent circuit of thyristor constituted by transistors 10 and 12” corresponds to the controllable switching means,
The switch 4 may be a mechanical switch or a semiconductor switch as long as it is a controllable switching means that can be turned on and off.

The operation of the circuit of FIG. 2 is as follows. When the switch 4 is on, the series circuit of the switch 4 and the diode 15 conducts between the switch terminals st4 and st5. When the switch 4 is off, the transistor 24 and the resistor 14 conduct between the switch terminals st5 and st6. At this time, the switch 4 controls the on / off of the transistor 24 together with the resistor 14. For this reason, focusing only on both switch terminals st4 and st5, when switch 4 is off, DC power supply 1
Is output between the two switch terminals st4 and st5 via the transistor 24 and the resistor 14, and when the switch 4 is on, the series circuit of the switch 4 and the diode 15 short-circuits the two switch terminals st4 and st5. In other words,
When the switch 4 is on, a voltage of zero is applied to both switch terminals st4 · s via a series circuit of the switch 4 and the diode 15.
Since it can be said that the voltage is output during t5, the switching circuit of FIG. 2 switches (= switches) the voltage output between both switch terminals st4 and st5.

Similarly, focusing only on the area between the switch terminals st5 and st6, when the switch 4 is on, the DC power supply 1
Is output between the two switch terminals st5 and st6 via a series circuit of the switch 4 and the diode 15, and when the switch 4 is off, the transistor 24 and the resistor 14 short-circuit the two switch terminals st5 and st6. In other words,
When the switch 4 is off, it can be said that a voltage of zero is output between both switch terminals st5 and st6 via the transistor 24 and the resistor 14, so that the switching circuit of FIG. 2 eventually outputs also between both switch terminals st5 and st6. This means that the voltage has been switched (= switched).

When the power supply short-circuit current temporarily flows through the switch 4, the diode 15, and the transistor 24 when the switch 4 is turned on, the short-circuit current removes the charge accumulated between the emitter and the base of the transistor 24. In addition, a reverse voltage is applied between the emitter and the base of the transistor 24 due to a voltage drop generated in the diode 15, thereby speeding up the turn-off of the transistor 24. Also, if the output current flows through the diode 15 while the switch 4 is on, the voltage drop caused by this will continue to reverse bias the transistor 24, so that the off state of the transistor 24 is stabilized. In addition, resistance 1
4 can be considered as ON signal supply means for supplying an ON signal corresponding to the output current to the transistor 24 in accordance with the ON / OFF of the switch 4, or the resistor 14 is provided with a pull-down resistor for lowering the base potential of the transistor 24. The switch 4 may be considered as a pull-up switch for raising the base potential of the transistor 24, and the series circuit of the switch 4 and the resistor 14 as pull-up / down means for raising or lowering the base potential of the transistor 24. it can.

In the switching circuit shown in FIG. 3, when the short-circuit current of the power supply or the output current causes a voltage drop in the series circuit of the diode 15 and the resistor 30 as described above, a larger reverse current than the circuit of FIG. A bias voltage can be applied. Each of the switching circuits shown in FIGS. 2 and 3 is often applied to a gate circuit of a MOSFET.

The switching circuit of FIG. 4 utilizes the portion between the switch terminals st5 and st6 in the switching circuit of FIG.
4 and a diode 15 are connected in series. Alternatively, it can be said that the switching circuit of FIG. 2 utilizes the portion between the two switch terminals st5 and st6, and switches the position of the series connection between the switch 4 and the DC power supply 1. Therefore, the switching circuit of FIG. 4 has the same switching action as the switching circuit of FIG. 2. When the switch 4 is turned on, the voltage of the DC power supply 1 is switched via the diode 15 and the switch 4 to both switch terminals s.
It is output during t10 and st11. When the switch 4 is turned off, the transistor 24 and the resistor 14 short-circuit between both switch terminals st10 and st11. Alternatively, zero voltage is output between both switch terminals st10 and st11 via the transistor 24 and the resistor 14.

The number of switch terminal pairs that can be used in the switching circuit of FIG. 4 is one less than that of the switching circuit of FIG. 2, but instead, the switch 4 is provided with a PNP transistor such as an NPN transistor or an N-channel MOSFET. The driving bias voltage polarity is opposite to that of the transistor 24, and
This is convenient when using a low-side semiconductor switch. 2 and FIG. 4, if the series circuit of the DC power supply 1 and the switch 4 is considered as a DC voltage output means for outputting or not outputting a DC voltage, the switching between the switch terminals on both sides of the transistor 24 is possible. With respect to both switching circuits are exactly the same.

Then, in each of the switching circuits shown in FIGS. 2 to 4, instead of each transistor 24, a P-channel MOS.
It is also conceivable to use voltage-driven controllable switching means such as IT, IGBT, SI thyristor, and the like. If you want to make each gate forward bias voltage large enough,
There is each switching circuit of FIG. The switching circuit of FIG. 7 replaces the position of the series connection of the DC power supply 1 and the switch 4 in the switching circuit of FIG. 6, replaces the position of the series connection of the DC power supply 2 and the resistor 3, and connects the load resistor 29 to the transistor 28. This is a switching circuit that is reconnected between the drain and the source.

Each of the switching circuits shown in FIGS.
O thyristor 36 or 37 or transistor 10,
Reference numeral 12 denotes a switching circuit using an equivalent circuit of the thyristor. 8 and 11, the reverse bias voltage is increased by using two diodes 13 connected in series for reverse bias. In the circuit of FIG. 9, a series circuit of DC power supplies 1 and 101 is used as a power supply in order to output positive and negative voltages, that is, to switch (= switch) the output voltage between positive and negative. One of the switch terminals is taken out from the connection point,
A diode 1 is used as a voltage drop means for reverse bias.
A parallel circuit of 3 and a resistor 30 is used. 9 and 11, when an inductive load (not shown) is connected to each switch terminal while the switch 4 is on, the inductive load current flows between the gate and cathode of the thyristor 36 or the thyristor. Two diodes 32 connected in anti-parallel are connected to each gate so as not to flow between the anode and the gate on the anode side of the switch 37 but to bypass the switch 4 and the series circuit of the diode 7 or 8 and connect to each gate. The descent is increased to make it difficult to flow.

FIGS. 16 to 26 show a conventional switching circuit for cascading a plurality of controllable switching means for connecting a voltage drop means for reverse biasing or a plurality of controllable switching means for directly switching the output voltage, or a derivative thereof. FIG. When a plurality of stages are directly connected as described above, the output current when the switch 4 is off is increased, or the resistances of the resistors 14 and 9 are increased so that the resistors are consumed when the switch 4 is on. The current can be reduced or the like. When the diode 115 is connected in the circuit of FIG. 22, after the power supply short-circuit current or the output current draws the accumulated charge between the base and emitter of each of the transistors 40, 39, and 12 by turning on the switch 4, Output current is diode 1
The diode 115 reduces energy consumed in the series circuit of 13, 13, and 15. The same applies to the diode 13 in the circuits in FIGS. 23 to 25 and the diode 115 in the circuit in FIG. In the case of the circuit of FIG. 26, the capacitor 51 prevents the circuit from easily oscillating due to the capacitance between both switch terminals of the switch 4 when the switch 4 is off.

However, there is a first problem that "there are few choices of controllable switching means to be combined" only with the conventional multiple-stage direct-connection type switching circuit as shown in each of FIGS. 16 to 26.
(First problem) This means that the controllable switching means (eg:
Transistors 16 and 12 in the circuit of FIG. ) In addition to the controllable switching means (for example, the switch 4 in the circuit of FIG. 16) for controlling them, the output voltage is different from that of the conventional multi-stage direct-connection type switching circuit. In this case, if a switching circuit of a plurality of stages directly connected can be constructed, the number of controllable switching means to be combined as a whole including the conventional options increases, which is convenient.

For example, in the circuit shown in FIG. 16, the controllable switching means in which the NPN transistors 12 and 16 both have a positive forward bias voltage polarity of the drive signal and have a negative forward bias voltage polarity of the drive signal instead of either one of them. (Example: PNP transistor) cannot be used. Each of two controllable switching means (eg, NPN transistor and PNP transistor) having positive and negative forward bias voltage polarities of the drive signal is connected to “voltage drop means (eg, diodes 13, 15) for reverse bias. If a "multiple-stage direct-connection type switching circuit for switching the output voltage" can be configured by using the "controllable switching means", the number of controllable switching means to be combined increases, which is convenient.

Also, for example, the circuit of FIG.
A high-side switch (eg, a first-stage PNP transistor and a second-stage NPN or PNP transistor cascade connection circuit) may be used. Switch (Example: NPN transistor in the first stage and NPN in the second stage
Alternatively, a cascade connection circuit of PNP transistors. )
Is a circuit that is easier to use. Conversely, controllable switching means (NPN transistors 12, 1) in which the forward bias voltage polarity of the drive signal is positive and the voltage drop means (diodes 13 and 15) are connected for reverse bias.
6) The switch 4 is connected to the positive power supply terminal side of the DC power supply 1 for the two switches, and it is easier to use a high-side switch for the switch 4. If a "circuit" can be formed, the options of the controllable switching means to be used on the switch 4 side, that is, the options of the controllable switching means to be combined increase, which is convenient.

Next, there is a second problem that the connection arrangement of the controllable switching means for connecting the voltage drop means for reverse bias is not well balanced, in the conventional switching circuit of the multistage direct connection type.
(Second Problem) For example, in the circuit shown in FIG. 16, "the current flowing from the cascade-connected transistors 16 and 12 to the switch terminal st8" and "the switch terminal st8"
8 to the switch 4 through the diodes 13 and 15 to the switch 4 ”.
For example, if a direct connection type transistor in which two NPN transistors are cascade-connected is used, the rise of the base potential of the transistor 16 when the direct connection type transistor is turned off, that is, the rise of the output voltage of the switch terminal st8 is delayed. This is because the resistance 14 is too light as a load resistance with respect to the collector current capacity of the direct-coupled transistor, and also because the resistance value of the resistance 14 is too large to charge the collector-emitter capacitance at the time of turn-off. It is.

However, the switch 4 is connected to the resistor 14
If one NPN transistor having a small collector current capacity corresponding to the resistance value of the transistor is used, the rise of the output voltage of the switch terminal st8 becomes faster and is improved.
In order to turn off the transistor 2, its falling current is slow because the small current capacity transistor has insufficient power.
The above-described balance between the bidirectional output current capacities is greatly lost. This is the same even if another circuit is used as the pull-up / down means instead of the series circuit of the resistor 14 and the switch 4. In the end, this means that both the controllable switching means (transistors 16 and 12) for connecting the voltage drop means for reverse biasing are arranged and connected only to one-way output current path (side of the resistor 14). This is because the connection arrangement is not balanced. For example, this is not the case if the controllable switching means for connecting the voltage drop means for reverse bias is arranged and connected one by one to the output current path in each direction (resistor 14 side and switch 4 side).

In addition, as described above, since the voltage drop caused by the power supply short-circuit current and the output current in the voltage drop means becomes the reverse bias drive voltage, the controllable switching means for connecting the voltage drop means for reverse bias is used. Since the turn-off is fast, for example, if such controllable switching means can be arranged and connected one by one to the output current path in each direction, it is easy to cut off the output current path in each direction. In the case of the circuit shown in FIG. 16 and the like, it has not been conventionally possible to use a controllable switching means for the switch 4 for interrupting the one-way output current path and use a similar voltage drop means to speed up the turn-off.

Third, the controllable switching means for connecting the voltage drop means for reverse bias is cascade-connected or directly connected. "The more the number of stages, the easier the oscillation becomes, and the switching operation becomes unstable." A third problem lies in the conventional multi-stage direct-connection type switching circuit.
(Third problem) For example, in the circuit shown in FIG. 26, a capacitor 51 is connected as shown in FIG. 26 to prevent oscillation. As the number of cascade-connected stages increases, oscillation becomes easier, and Becomes unstable.

Fourth, the fourth problem that "there is no complete power supply short-circuit prevention function" is that the conventional single-stage switching circuit shown in FIGS. Yes.
(Fourth Problem) For example, in the circuit of FIG. 2, as long as the switch 4 is on, the transistor 24 cannot be turned on. However, an inductive load is connected to the switch terminal st5 and the like, and the inductive load current is applied to the transistor 24.
Excluding the case of forward biasing. On the other hand, since the switch 4 can be turned on even when the transistor 24 is on,
Even if the reverse bias effect caused by the power supply short-circuit current as described above speeds up its turn-off, its turn-off
Depending on the length of time, the magnitude of the power supply capacity of the DC power supply 1, and the like, the DC power supply 1, the transistor 24, and the like are damaged, and the switching loss cannot be ignored. Therefore, from the viewpoint of the power supply short-circuit prevention function, the transistor 2
Ideally, switch 4 cannot be turned on as long as 4 is on. Therefore, as long as the transistor 24 and the switch 4 are turned on each other, if their turn-on is prevented, the function of preventing short-circuit of the power supply is completed.

[0200]

Therefore, the first aspect of the present invention can increase the number of selectable controllable switching means to be combined, and has a well-balanced connection arrangement of the controllable switching means for connecting the voltage drop means for reverse bias. Intended to provide a circuit

[0210]

It is therefore an object of the second invention to provide a switching circuit capable of increasing the number of controllable switching means to be combined.

[0220]

The object of the third invention is that the third invention can increase the choices of controllable switching means to be combined, and cascade or similarly directly connect controllable switching means for connecting voltage drop means for reverse bias. It is an object of the present invention to provide a switching circuit which does not easily oscillate even if the number of stages to be increased increases and has a stable switch operation.

[0230]

In view of the above, the fourth aspect of the present invention can increase the number of controllable switching means to be combined, and provides a well-balanced switching arrangement of the controllable switching means for connecting the voltage drop means for reverse bias. Intended to provide a circuit

[0240]

Therefore, the fifth aspect of the present invention can increase the number of controllable switching means to be combined, and the connection arrangement of the controllable switching means for connecting the voltage drop means for reverse bias is well balanced. It is an object of the present invention to provide a switching circuit having a function of completely preventing short-circuit of a power supply.

[0250]

A sixth object of the present invention is to provide a self-oscillation type resonance type power conversion circuit using the switching circuit of the fifth invention.

[0260]

That is, the first invention comprises first and second controllable switching means having a normally-off function and a self-turn-off function, wherein the control terminal and both main terminals of the former are connected to each other. Control terminal ct1, main terminal mt1a and main terminal m
When the control terminal and both main terminals are called a control terminal ct2, a main terminal mt2a and a main terminal mt2b, and the control terminal ct1 and the main terminal mt1a are paired for inputting a drive signal. The control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input,
Between the control terminal ct1 and the main terminal mt1a and between the control terminal ct2
When the polarity of the bias voltage between the main terminals mt2a is reversed, the control terminal ct1 is connected to the main terminal mt2a, and the first terminal for reverse bias is connected between the control terminal ct1 and the main terminal mt1a.
Connected to the control terminal ct2 and the main terminal mt.
Connecting a second voltage drop means between 2a for reverse bias,
The series circuit of the portion between the main terminal mt1b and the main terminal mt1a, the first voltage dropping means and the portion between the main terminal mt2a and the main terminal mt2b is connected to the control terminal ct1 and the main terminal mt1a between both power terminals of the first DC power supply means. This is a switching circuit which is connected in the reverse bias direction between them and provided with pull-up / down means for raising or lowering the potential of the control terminal ct2.

Thus, the first and second controllable switching means for connecting the voltage drop means for reverse bias one by one are directly connected, and the potential of the control terminal ct2 of the pull-up / down means is increased. The voltage output between the main terminal mt1b and the main terminal mt1a and between the main terminal mt1a and the main terminal mt2b can be switched based on the pull-down.

In addition, the first and second controllable switching means for connecting the voltage drop means one by one for reverse bias have opposite drive bias voltage polarities and differ from the conventional combination. The number of options for switching means can be increased. "
The switching circuit according to the invention is provided. (First effect)

The fact that the first and second controllable switching means are connected in series between the two power supply terminals and are connected so as to short-circuit the power supply means that one of them comes out of the power supply. And the other is located at the point where the power supply enters, and one is arranged and connected to each of the output current paths in each direction. There is a second effect that the switching arrangement of the first invention is that the connection arrangement of the means is well balanced. (Second effect)

In the case where the first invention corresponds to the switching circuit described in claim 2, the connection point and the main terminal m
By outputting a first predetermined positive voltage or outputting a second predetermined negative voltage during t1a, "the output voltage can be switched between positive and negative".
There is an effect that. (Effect of lower invention)

In the case where the first invention corresponds to the switching circuit according to the third aspect of the present invention, "NOT circuit, NAND circuit,
It can function as a NOR circuit or a logic circuit. "
(Effect of lower invention)

[0320]

That is, the second invention comprises first and second controllable switching means having a normally-off and self-turn-off function, wherein the former control terminal and both main terminals are connected to each other. Control terminal ct1, main terminal mt1a and main terminal m
When the control terminal and both main terminals are called a control terminal ct2, a main terminal mt2a and a main terminal mt2b, and the control terminal ct1 and the main terminal mt1a are paired for inputting a drive signal. The control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input,
Between the control terminal ct1 and the main terminal mt1a and between the control terminal ct2
When the polarity of the bias voltage between the main terminals mt2a is reversed, the main terminal mt1b is connected to the main terminal mt2a, and the first terminal for reverse bias is connected between the control terminal ct1 and the main terminal mt1a.
Connected to the control terminal ct2 and the main terminal mt.
Connecting a second voltage drop means between 2a for reverse bias,
A first ON signal supply unit for supplying an ON signal to the first controllable switching unit is formed together with the second controllable switching unit between the control terminal ct1 and the main terminal mt1b, and the control terminal ct2 and the main terminal mt2b. A second ON signal supply means for supplying an ON signal to the second controllable switching means is connected therebetween, and the DC voltage output means for outputting or not outputting a DC voltage is connected between both output terminals of the DC voltage output means. 2 is a switching circuit in which a voltage drop unit, a portion between the main terminal mt1b and the main terminal mt1a, and a series circuit of the first voltage drop unit are connected in a reverse bias direction between the control terminal ct1 and the main terminal mt1a.

Thus, the first and second controllable switching means are directly connected, and when the DC voltage is being output, the DC voltage is simultaneously supplied via the first and second voltage drop means. The voltage is output between the terminal mt1b and the main terminal mt1a, and when the DC voltage is not output, a voltage of zero is output via the first and second ON signal supply means and the first controllable switching means. It is output between the main terminals mt1a. That is, the voltage output between the main terminal mt1b and the main terminal mt1a can be switched based on the presence or absence of the output of the DC voltage.

In addition, the first and second controllable switching means for connecting the voltage drop means one by one for reverse bias have opposite drive bias voltage polarities and differ from the conventional combination. The switching circuit according to the second aspect of the present invention has the effect that the number of options of the switching means can be increased. (Effect)

[0350]

That is, the third invention comprises a first and a second controllable switching means having a normally-off function and a self-turn-off function. Control terminal ct1, main terminal mt1a and main terminal m
When the control terminal and both main terminals are called a control terminal ct2, a main terminal mt2a and a main terminal mt2b, and the control terminal ct1 and the main terminal mt1a are paired for inputting a drive signal. The control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input,
Between the control terminal ct1 and the main terminal mt1a and between the control terminal ct2
Assuming that the bias voltage polarities between the main terminals mt2a are the same, the control terminal ct1 is connected to the main terminal mt2a,
A third controllable switching means is connected to the main terminal mt1b, a first voltage drop means is connected between the control terminal ct1 and the main terminal mt1a for reverse bias, and a reverse bias is connected between the control terminal ct2 and the main terminal mt2a. To the first controllable switching means between the main terminal mt1b and the control terminal ct1 and the second controllable switching means. And a second ON signal supply means for supplying an ON signal to the second controllable switching means between the control terminal ct2 and the main terminal mt2b. The third controllable switching means, the main terminal mt1b A part between the main terminals mt1a, a series circuit of the first voltage drop means and the second voltage drop means, and a control terminal ct1 between both power supply terminals of the first DC power supply means; A switching circuit connected to reverse bias direction between child MT1A.

As a result, the first and second controllable switching means are directly connected, and when the third controllable switching means is on, the voltage of the first DC power supply is changed to the first and second controllable switching means. Main terminal mt1b via voltage drop means
A voltage output between the main terminal mt1a and a voltage of zero when the third controllable switching means is turned off, via the first and second on-signal supply means and the first controllable switching means; . It is output between the main terminals mt1a. That is, the voltage output between the main terminal mt1b and the main terminal mt1a can be switched based on the ON / OFF state of the third controllable switching means.

In addition, the drive bias voltage polarities of the first and second controllable switching means for connecting the voltage drop means one by one for reverse bias are the same as in the conventional circuit, but the third bias voltage is used. Since the position at which the controllable switching means is connected to the first DC power supply is opposite to that of the conventional circuit, and the third controllable switching means can use a different controllable switching means from the conventional circuit, The number of options can be increased "in the switching circuit of the third invention.
(First effect) In particular, when the third controllable switching means is also a two-stage direct controllable controllable switching means in response to the first and second controllable switching means directly connected to the two-stage, the second effect is obtained. Because the combination of stages is different from the conventional combination,
“The number of controllable switching means to be combined can be increased. 』

The first and second controllable switching means are cascade-connected or similarly directly connected. However, the control terminal ct2 is directly grounded to the power supply line, and the control terminal ct1 is at least AC-controlled. ct2, main terminal m
It is grounded to the power supply line by the capacitance during t2a. Further, for example, a PN is connected between the control terminal ct2 and the main terminal mt2a.
If the junction is formed like a base-emitter PN junction of a bipolar transistor and the second voltage drop means is a constant voltage means such as a diode, the PN junction and the constant voltage means are connected in anti-parallel. Has been
The control terminal ct1 is also grounded to the power supply line in DC terms. For this reason, each control electrode (eg, base electrode) of the first and second controllable switching means is located between both main electrodes (eg, collector electrode and emitter electrode) and has a shielding function. Therefore, the feedback operation from the output side to the input side of each controllable switching means is prevented. Therefore,
"Even if the number of stages in which the controllable switching means for connecting the voltage drop means for reverse bias is cascaded or directly connected increases, oscillation is difficult and the switch operation is stable."
This is the second effect of the switching circuit of the third invention. (Second effect)

In the case where the third invention corresponds to the switching circuit according to the eighth aspect, the third controllable switching means is on and the first and second controllable switching means are in a steady state of off. In addition, since the energy consumed by the output current by the voltage drop means is only required for the first voltage drop means, there is an effect that "the energy consumption can be saved".
(Effect of lower invention)

[0400]

That is, the fourth invention comprises first and second controllable switching means having a normally-off function and a self-turn-off function, wherein the first control terminal and both main terminals are connected to each other. Control terminal ct1, main terminal mt1a and main terminal m
When the control terminal and both main terminals are called a control terminal ct2, a main terminal mt2a and a main terminal mt2b, and the control terminal ct1 and the main terminal mt1a are paired for inputting a drive signal. The control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input,
Between the control terminal ct1 and the main terminal mt1a and between the control terminal ct2
Assuming that the bias voltage polarities between the main terminals mt2a are the same, the main terminal mt1b and the main terminal mt2a are connected,
A first voltage drop means is connected between the control terminal ct1 and the main terminal mt1a for reverse bias, and the control terminal ct2 and the main terminal m
During t2a, the second voltage drop means is connected for reverse bias, and the portion between the main terminal mt2b and the main terminal mt2a, the main terminal m
The part between t1b and the main terminal mt1a and the series circuit of the first voltage drop means are connected between both power terminals of the first DC power supply means in the reverse bias direction between the control terminal ct1 and the main terminal mt1a, and the control terminal ct2 This is a switching circuit provided with pull-up / down means for raising or lowering the potential of the switch.

Thus, the first and second controllable switching means for connecting the voltage drop means for reverse bias one by one are directly connected, and the potential of the control terminal ct2 of the pull-up / down means is increased. The voltage output between the main terminal mt1b and the main terminal mt1a can be switched based on the pull-down.

In addition, one voltage drop means is provided for reverse bias.
Since the first and second controllable switching means connected one by one have a well-balanced connection arrangement as described later, the degree of freedom of the pull-up / down means is increased, and the first and second controllable switching means are used for the pull-up / down means. There are many options for controllable switching means. As a result, the switching circuit of the fourth invention has the first effect that “the number of controllable switching means to be combined can be increased”.
(First effect)

For example, in the conventional circuit shown in FIG. 16, the connection positions of the resistor 14 and the switch 4 cannot be interchanged in order to maintain the balance between the output currents in each direction (eg, source current and sink current). On the other hand, in the case of the fourth invention, since the connection arrangement of the first and second controllable switching means is well-balanced, whichever is used when a series circuit of a resistor and the controllable switching means is used for the pull-up / down means. May be a pull-up means or a pull-down means. In other words, the controllable switching means may be a high-side switch or a low-side switch, so that there are many options.

Further, when the second controllable switching means is on, the part between the main terminal mt1b and the main terminal mt1a and the series circuit of the first voltage drop means are connected between the two power supply terminals. The first controllable switching means is turned off. In other words, since the first and second controllable switching means are opposite in operation and are arranged and connected one by one to the output current path in each direction, the "controllable control means for connecting the voltage drop means for reverse bias" is used. The connection effect of the switching means is well balanced ”.
The switching circuit according to the invention is provided.
(Second effect)

[0450]

That is, the fifth invention is characterized in that there are first and second controllable switching means having a normally-off and self-turn-off function, wherein the former control terminal and both main terminals are connected. Control terminal ct1, main terminal mt1a and main terminal m
When the control terminal and both main terminals are called a control terminal ct2, a main terminal mt2a and a main terminal mt2b, and the control terminal ct1 and the main terminal mt1a are paired for inputting a drive signal. The control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input,
Between the control terminal ct1 and the main terminal mt1a and between the control terminal ct2
Assuming that the bias voltage polarities between the main terminals mt2a are the same, the control terminal ct1 and the main terminal mt2b are connected,
A first voltage drop means is connected between the control terminal ct1 and the main terminal mt1a for reverse bias, and the control terminal ct2 and the main terminal m
During t2a, a second voltage drop means is connected for reverse bias, and a portion between the main terminal mt1b and the main terminal mt1a,
The voltage drop means, the portion between the main terminal mt2b and the main terminal mt2a, and the series circuit of the second voltage drop means are connected between the two power supply terminals of the first DC power supply means by the control terminal ct1 and the main terminal m.
connected in the reverse bias direction during t1a to raise or lower the potential of the control terminal ct1.
This is a switching circuit provided with a down unit.

As a result, the first and second controllable switching means for connecting the voltage drop means for reverse bias one by one are directly connected, and the potential of the control terminal ct2 of the pull-up / down means is increased. The voltage output between the main terminal mt1a and the main terminal mt2a can be switched based on the pull-down.

In addition, one voltage drop means is provided for reverse bias.
Since the first and second controllable switching means connected one by one have a well-balanced connection arrangement as described later, the degree of freedom of the pull-up / down means is increased, and the first and second controllable switching means are used for the pull-up / down means. There are many options for controllable switching means. As a result, the switching circuit of the fifth invention has the first effect that “the number of controllable switching means to be combined can be increased”.
(First effect)

For example, in the conventional circuit of FIG. 16, the connection position of the resistor 14 and the switch 4 cannot be interchanged in order to maintain the balance between the output currents in each direction (eg, source current and sink current). On the other hand, in the case of the fifth invention, since the connection arrangement of the first and second controllable switching means is well-balanced, whichever is used when a series circuit of a resistor and the controllable switching means is used for the pull-up / down means. May be a pull-up means or a pull-down means. In other words, the controllable switching means may be a high-side switch or a low-side switch, so that there are many options.

Further, if the first and second controllable switching means are simultaneously turned on, the first and second voltage drop means are connected in series between the power supply terminals. , The first and second controllable switching means are both reverse biased and simultaneously turned on.
Cannot turn on. In other words, since the first and second controllable switching means are opposite in operation and are arranged and connected one by one to the output current path in each direction, the "controllable control means for connecting the voltage drop means for reverse bias" is used. The switching circuit according to the fifth invention has a second effect that the connection arrangement of the switching means is well balanced.
(Second effect)

Then, if one of the first and second controllable switching means is turned on and the other attempts to turn on, the first and second voltage drop means are also turned on by the two power supplies. Since the first and second controllable switching means are reverse-biased and cannot be turned on at the same time because they are connected in series to the terminal 1, the power supply short circuit is always prevented. In other words, the switching circuit of the fifth invention has the third effect of "having a function of completely preventing short-circuiting of the power supply". (Third effect)

[0510]

That is, a sixth aspect of the present invention is the switching circuit according to the fifth aspect of the present invention, wherein a load resonance means for directly or equivalently forming a series resonance means with a load is provided between the main terminal mt1a and the main terminal mt2a. A resonance type power conversion circuit which is connected and operates so that the pull-up / down means assists the resonance operation based on the direction of the current of the load resonance means.

As a result, the voltage between both ends of the load resonance means is switched in synchronization with the resonance operation so as to maintain the resonance operation, so that the resonance type power conversion circuit continues to oscillate by itself and the load is connected to the load. The resonance voltage or the resonance current continues to be supplied. Therefore, a resonance type power conversion circuit of a self-oscillation type can be realized by using the switching circuit of the fifth invention. " (Effect) Since the pull-up / down means can be formed only by a resistance means or a controllable switching means, a self-oscillation type resonance power converter can be used without using a transformer having a feedback winding. A circuit can be realized.

[0530]

BEST MODE FOR CARRYING OUT THE INVENTION In order to describe each invention in more detail, the invention will be described below with reference to the accompanying drawings. The embodiment of FIG. 1 is a switching circuit of the first invention,
It corresponds to the switching circuit of claim 1 and the like, and each corresponds to each of the above-described components as follows. a) The transistors 16 and 24 serve as the first and second controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 16 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) The base terminal, the emitter terminal, and the collector terminal of the transistor 24 are the control terminal ct2 and the main terminal mt described above.
2a and the main terminal mt2b. d) Diodes 13 and 15 serve as the first and second voltage drop means described above. e) DC power supply 1 is the first DC power supply means described above. f) The switch 4 and the resistor 14 serve as the pull-up / down means described above.

Each of the embodiments shown in FIGS. 27 to 30 is a switching circuit according to the first invention, which corresponds to the switching circuit according to claim 1 or 3 and the like. -A MOS NOT circuit, a NAND circuit, and a NOR circuit are used. It can be regarded as a circuit in which a buffer is connected to each C / MOS logic circuit. FIG.
7, each embodiment of FIG. 30 is a NOT circuit, the embodiment of FIG. 28 is a NAND circuit, and the embodiment of FIG. 29 is a NOR circuit.

In the embodiment of FIG. 31, the switching circuit of the first invention uses a normally-off SI thyristor having a plus gate and a minus gate. P,
Instead of the N-channel SI thyristor, a P / N-channel MOS-FET or SIT may be used.

The embodiment shown in FIG. 32 is a switching circuit according to the first invention, which corresponds to the switching circuit according to claim 1 or 2, and the DC power supplies 1 and 101 are the second and third DC power supply described in the same claim. They correspond to power supply means, respectively.

Each of the embodiments shown in FIGS. 33 to 35 is a switching circuit according to the second invention, and corresponds to the switching circuit according to claim 4 or 6. In the embodiment of FIG. 33, each corresponds to each of the above-described components as follows. a) The transistors 16 and 24 serve as the first and second controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 16 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) The base terminal, the emitter terminal, and the collector terminal of the transistor 24 are the control terminal ct2 and the main terminal mt described above.
2a and the main terminal mt2b. d) Diodes 13 and 15 serve as the first and second voltage drop means described above. e) The transistor 24 itself and the resistor 14 serve as the first and second ON signal supply means described above. f) The DC power supply 1 is the first DC power supply means according to claim 6. g) The switch 4 is a third controllable switching means according to claim 6. In the embodiment of FIG. 34, the transistor 24 and the DC power supply 2 correspond to the above-described first ON signal supply unit, and the resistor 14 corresponds to the above-described second ON signal supply unit.

The embodiment shown in FIG. 36 is a switching circuit according to the second aspect of the present invention, and corresponds to the switching circuit according to the fourth or fifth aspect. In the embodiment shown in FIG. 33, the connection positions of the DC power supply 1 and the switch 4 are interchanged. Is only a thing.

Each of the embodiments shown in FIGS. 37 to 39 is a switching circuit according to a third aspect of the present invention, and corresponds to the switching circuit of the seventh aspect. In the embodiment of FIG. 37, each corresponds to each of the above-described components as follows. a) The transistor 58 and the “equivalent circuit of the thyristor formed by the transistors 10 and 12 and the resistor 11” serve as the first and second controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 58 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) The base terminal and the emitter terminal of the transistor 11 and the emitter terminal of the transistor 10 are the control terminal ct2, the main terminal mt2a, and the main terminal mt2b. d) Diodes 13 and 15 serve as the first and second voltage drop means described above. e) The "equivalent circuit of the thyristor formed by the transistors 10, 12 and the resistor 11" itself and the resistor 9 serve as the first and second ON signal supply means described above. f) The DC power supply 1 serves as the first DC power supply means described above. g) The switch 4 is the third controllable switching means described above. In the embodiment of FIG. 38, the transistor 16 and the DC power supply 2 correspond to the above-mentioned first ON signal supply means, and the resistor 1
Reference numeral 4 corresponds to the above-described second ON signal supply unit.

The embodiment of FIG. 40 is a switching circuit according to a third aspect of the present invention, which corresponds to the switching circuit of the eighth aspect.
As described above, it is possible to reduce energy loss due to the voltage drop unit.

The embodiment of FIG. 41 is a switching circuit according to a fourth aspect of the present invention, which corresponds to the switching circuit of the ninth aspect.
Each corresponds to each component described above as follows. a) The transistors 18 and 16 serve as the first and second controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 18 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) The base terminal, the emitter terminal, and the collector terminal of the transistor 16 are the control terminal ct2 and the main terminal mt described above.
2a and the main terminal mt2b. d) Diodes 22 and 15 serve as the first and second voltage drop means described above. e) DC power supply 1 is the first DC power supply means described above. f) The resistor 14 and the switch 4 serve as the pull-up / down means described above.

The circuit of FIG. 42 is a self-oscillation type resonance type power conversion circuit using the switching circuit of the embodiment of FIG. In the figure, 17 is a simple power switch, 19 is a resonance inductance means, 20 is a load resistance, 21 is a resonance capacitance means, 91 is a light emitting diode, and 92 is a light receiving diode.

The embodiment of FIG. 43 is a switching circuit according to a fifth aspect of the present invention, and corresponds to the switching circuit according to the tenth aspect. a) The transistors 16 and 18 serve as the first and second controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 16 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) The base terminal, the emitter terminal, and the collector terminal of the transistor 18 are the control terminal ct2 and the main terminal mt described above.
2a and the main terminal mt2b. d) The diodes 15 and 22 serve as the first and second voltage drop means described above. e) DC power supply 1 is the first DC power supply means described above. f) The switch 4 and the resistor 14 are pulled up as described above.
To down means.

FIG. 43 clearly shows that the transistor 16, the diode 15, the transistor 18 and the diode 22 are connected in series between the two power supply terminals of the DC power supply 1. The reason why the first and second controllable switching means and the first and second voltage drop means described above are connected in series between the two power supply terminals of the DC power supply 1 in the fifth aspect of the present invention is as follows. Only the circuit. This is an effect unique to the fifth invention, that is, an effect of "having a function of completely preventing short-circuit of the power supply". Transistor 1
Even if the transistors 6 and 18 are turned on at the same time, the current flowing through both the diodes 15 and 22 causes a voltage drop to reverse-bias between the base and the emitter, thereby turning off each transistor. work. Thus, transistors 16 and 18 are prevented from turning on as long as the other is on.

Each of the embodiments shown in FIGS. 44 to 59 is a self-oscillation type resonance type power conversion circuit according to the sixth invention, and corresponds to the resonance type power conversion circuit described in claim 11. In each figure, 17 is a simple power switch, 19 is a resonance inductance means, 20
Is a load resistance, 21 is a resonance capacitance means, 49 is a start switch, 61 and 62 are resonance capacitance means 21
Clamps the power supply voltage to the power supply voltage and zero voltage.
A diode, 67 is a discharge gap means for ignition, and 68 is an ignition coil (step-up transformer for ignition). A connected body of the resonance inductance unit 19, the load resistor 20, and the resonance capacitance unit 21 corresponds to the above-described load resonance unit.

FIG. 45 shows a sixth embodiment of the present invention.
2 corresponds to the resonance type power conversion circuit described above, and in this embodiment, each corresponds to each component described above as follows. a) The transistor 16 is the first controllable switching means described above. b) The base terminal, the emitter terminal, and the collector terminal of the transistor 16 are the control terminal ct1 and the main terminal mt described above.
1a and the main terminal mt1b. c) "Equivalent circuit of thyristor formed by transistors 10 and 18" corresponds to the above-mentioned second controllable switching means. d) The base terminal and the emitter terminal of the transistor 18 and the emitter terminal of the transistor 10 are the control terminal c described above.
t2, to the main terminal mt2a and the main terminal mt2b. e) The diodes 15 and 22 serve as the first and second voltage drop means described above. f) The DC power supply 1 serves as the first DC power supply means described above. g) The transistor 10 and the resistor 14 serve as the pull-up / down means described above. (The transistor 10 performs the pull-down function described in claim 12.) h) The load resistor 20 is connected to the load described above. i) The "connection body of the resonance inductance means 19, the load resistor 20, and the resonance capacitance means 21" is the load resonance means described above. The control terminal of the equivalent thyristor, that is, the base of the transistor 18 is grounded. Of course, a real thyristor may be used instead of the equivalent thyristor. In this case, the thyristor need not have a self-turn-off function. The diodes 15, 22 and the resistor 23 help the current of the "series resonance circuit formed by the resonance inductance means 19 and the resonance capacitance means 21" to control the transistors 10, 16, 18.
The operation of this circuit is as follows. First, when the power switch 17 is turned on, the resonance capacitance means 21
Is zero and the transistors 10 and 18 are off, so that a closed circuit including the DC power supply 1, the transistor 16, the series resonance circuit, and the diode 22 is formed. Therefore, a current flows through the resonance circuit. The ON voltage of the diode 22 generated by this current acts as a reverse bias voltage for the transistor 18, and the transistors 18, 1
A 0 off is more complete. Thereafter, when the current is reversed to the opposite direction with respect to the transistor 16, the current starts flowing through the emitter junction of the transistor 18 via the resistor 23. Thus, the equivalent thyristors of transistors 10 and 18 turn on, and transistor 10 turns transistor 16 off. As a result, the series resonance circuit, the diode 15 and the transistors 10, 1
8 is formed. Then, the forward voltage of the diode 15 generated by the current of the resonance circuit functions as a reverse bias voltage for the transistor 16, and the transistor 16 is more completely turned off. Thereafter, when the current goes to zero, the equivalent thyristor turns off and transistor 16 turns on. Thereafter, the same operation is repeated, and the circuit oscillates. If the diode 8 is connected, the resistor 23 is not required. This is because the current of the resonance circuit that returns from the diode 8 to the DC power supply 1 passes through the emitter junction of the transistor 18. Further, both ends of the load resistor 20 may be short-circuited and the load resistor 20 may be connected in parallel to the resonance capacitance means 21 or the resonance inductance means 19.

In the embodiment shown in FIG. 57, the transistor 10,
Each set of 12, 39, 40 and resistors 42, 43, 77, 78 has a self-holding function and a self-turn function like a GTO thyristor.
A controllable switching means having an off function is configured.

The embodiment of FIG. 59 is different from the embodiment of FIG. 43 in that the switching circuit (the DC power supply 1 and the diodes 15 and 22 are reversed in direction and the NPN transistors are PNP) The switching circuit according to the fifth invention in which each PNP transistor is replaced one by one by an equivalent thyristor having an anode-side gate in the switching circuit according to the first invention similar to the switching circuit shown in FIG. A resonance type power conversion circuit according to a sixth aspect of the present invention, which is used as pull-up / down means.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a switching circuit of the first invention.

FIGS. 2 to 15 are circuit diagrams showing one conventional switching circuit or one switching circuit derived therefrom.

FIGS. 16 to 26 are circuit diagrams each showing a conventional multistage directly connected switching circuit or a switching circuit derived therefrom.

FIGS. 27 to 32 are circuit diagrams each showing one embodiment of the switching circuit of the first invention.

FIGS. 33 to 36 are circuit diagrams each showing one embodiment of the switching circuit of the second invention.

FIGS. 37 to 40 are circuit diagrams each showing one embodiment of the switching circuit of the third invention.

FIG. 41 is a circuit diagram showing one embodiment of a switching circuit of the fourth invention.

FIG. 42 is a circuit diagram showing one example of a resonance type power conversion circuit using one embodiment of the switching circuit of the fourth invention.

FIG. 43 is a circuit diagram showing one embodiment of the switching circuit of the fifth invention.

FIGS. 44 to 59 are circuit diagrams each showing one embodiment of the resonance type power conversion circuit of the sixth invention.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI H02M 7/537 H02M 7/537 E H03K 17/687 H03K 17/687 A

Claims (13)

(57) [Claims] 1. First and second controllable switching means having a normally-off function and a self-turn-off function are provided. The first control terminal and both main terminals are connected to a control terminal ct1,
A main terminal mt1a and a main terminal mt1b are called, and the latter control terminal and both main terminals are a control terminal ct2 and a main terminal mt2.
a and the main terminal mt2b, the control terminal ct1 and the main terminal mt1a form a pair for the former drive signal input, and the control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input. And the control terminal ct1
• between main terminals mt1a and control terminal ct2 • main terminal mt2a
When it is assumed that the bias voltage polarities are opposite, the control terminal ct1 is connected to the main terminal mt2a, the first voltage drop means is connected between the control terminal ct1 and the main terminal mt1a for reverse bias, and the control terminal A second voltage drop means is connected between ct2 and the main terminal mt2a for reverse bias, and a portion between the main terminal mt1b and the main terminal mt1a, a series of the first voltage drop means and a portion between the main terminal mt2a and the main terminal mt2b are connected. A circuit is connected between both power supply terminals of the first DC power supply means in a reverse bias direction between the control terminal ct1 and the main terminal mt1a, and pull-up / down means for raising or lowering the potential of the control terminal ct2 is provided. A switching circuit, characterized in that: 2. The first DC power supply means is constituted by a series circuit of second and third DC power supply means, and an output from a connection point between the second and third DC power supply means and a main terminal mt1a is provided. The switching circuit according to claim 1, wherein the switching circuit is taken out. 3. The pull-up / down means includes N
3. The switching circuit according to claim 1, wherein an OT circuit, a NAND circuit, a NOR circuit, or a logic circuit is used. 4. There are first and second controllable switching means having a normally-off and self-turn-off function. The first control terminal and both main terminals are connected to a control terminal ct1,
A main terminal mt1a and a main terminal mt1b are called, and the latter control terminal and both main terminals are a control terminal ct2 and a main terminal mt2.
a and the main terminal mt2b, the control terminal ct1 and the main terminal mt1a form a pair for the former drive signal input, and the control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input. And the control terminal ct1
• between main terminals mt1a and control terminal ct2 • main terminal mt2a
When it is assumed that the polarity of the bias voltage is opposite, the main terminal mt1b and the main terminal mt2a are connected, and the first voltage drop means for the reverse bias is connected between the control terminal ct1 and the main terminal mt1a. A second voltage drop means is connected between ct2 and the main terminal mt2a for reverse bias, and a first ON signal supply for supplying an ON signal to the first controllable switching means between the control terminal ct1 and the main terminal mt1b. Means are formed together with the second controllable switching means, and second on signal supply means for supplying an on signal to the second controllable switching means is connected between the control terminal ct2 and the main terminal mt2b; The second voltage drop means, the portion between the main terminal mt1b and the main terminal mt1a, and the first voltage drop between both output terminals of the DC voltage output means for outputting or not outputting Control terminal of the series circuit of the means ct1 · main terminal mt1a
A switching circuit connected in a reverse bias direction between the switching circuits. 5. The method according to claim 1, wherein a series circuit of a first DC power supply means and a third controllable switching means is used as the DC voltage output means, and the first DC power supply means is connected to a control terminal ct2. The switching circuit according to claim 4. 6. A method according to claim 1, wherein a series circuit of a first DC power supply means and a third controllable switching means is used as said DC voltage output means, and said first DC power supply means is connected to a control terminal ct1. The switching circuit according to claim 4. 7. There are first and second controllable switching means having a normally-off and self-turn-off function. The first and second control terminals are connected to a control terminal ct1,
A main terminal mt1a and a main terminal mt1b are called, and the latter control terminal and both main terminals are a control terminal ct2 and a main terminal mt2.
a and the main terminal mt2b, the control terminal ct1 and the main terminal mt1a form a pair for the former drive signal input, and the control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input. And the control terminal ct1
• between main terminals mt1a and control terminal ct2 • main terminal mt2a
Assuming that the bias voltage polarities are the same, the control terminal ct1 is connected to the main terminal mt2a, the main terminal mt1b is connected to the third controllable switching means, and the control terminal ct1 and the main terminal mt1a are connected in reverse. The first voltage drop means is connected for bias, the second voltage drop means is connected for reverse bias between the control terminal ct2 and the main terminal mt2a, and the first voltage drop means is connected between the main terminal mt1b and the control terminal ct1. A first ON signal supply means for supplying an ON signal to the control switching means is formed together with the second controllable switching means, and an ON signal is supplied to the second controllable switching means between the control terminal ct2 and the main terminal mt2b. The second on-signal supply means for supplying is connected, the third controllable switching means, the main terminal mt1b.
A part between the main terminal mt1a, the series circuit of the first voltage drop means and the second voltage drop means is connected to both power supply terminals 1 of the first DC power supply means in a reverse bias direction between the control terminal ct1 and the main terminal mt1a. A switching circuit characterized by being connected. 8. The control circuit according to claim 1, wherein said first voltage drop means is connected to a control terminal ct.
1 once, and the control terminal ct2 / main terminal mt1a
8. The switching circuit according to claim 7, wherein the switching circuit is connected again for a reverse bias. 9. There are first and second controllable switching means having a normally-off and self-turn-off function, and the former control terminal and both main terminals are connected to a control terminal ct1,
A main terminal mt1a and a main terminal mt1b are called, and the latter control terminal and both main terminals are a control terminal ct2 and a main terminal mt2.
a and the main terminal mt2b, the control terminal ct1 and the main terminal mt1a form a pair for the former drive signal input, and the control terminal ct2 and the main terminal mt2a form a pair for the latter drive signal input. And the control terminal ct1
• between main terminals mt1a and control terminal ct2 • main terminal mt2a
Assuming that the bias voltage polarities between them are the same, the main terminal mt1b and the main terminal mt2a are connected, the first voltage drop means for reverse bias is connected between the control terminal ct1 and the main terminal mt1a, and the control terminal A second voltage drop means is connected between ct2 and main terminal mt2a for reverse bias, and a portion between main terminal mt2b and main terminal mt2a, main terminal mt1
b, connecting a portion between the main terminal mt1a and the series circuit of the first voltage drop means between the two power supply terminals of the first DC power supply means in a reverse bias direction between the control terminal ct1 and the main terminal mt1a; A pull-up / down means for raising or lowering the potential of the switching circuit. 10. There are first and second controllable switching means having a normally-off and self-turn-off function, wherein the control terminal and the two main terminals are connected to a control terminal ct.
1, the main terminal mt1a and the main terminal mt1b, the latter control terminal and both main terminals being the control terminal ct2 and the main terminal m
The control terminal ct1 and the main terminal mt1a form a pair for inputting the driving signal, and the control terminal ct2 and the main terminal mt2a form a pair for inputting the driving signal. And the control terminal ct1
• between main terminals mt1a and control terminal ct2 • main terminal mt2a
Assuming that the bias voltage polarity between them is the same, the control terminal ct1 is connected to the main terminal mt2b, and the first voltage drop means is connected between the control terminal ct1 and the main terminal mt1a for reverse bias. A second voltage drop means is connected between ct2 and the main terminal mt2a for reverse bias, a portion between the main terminal mt1b and the main terminal mt1a, the first voltage drop means, a portion between the main terminal mt2b and the main terminal mt2a, and A series circuit of the second voltage drop means is connected between both power terminals of the first DC power means by a control terminal ct1 and a main terminal mt1.
a switching circuit connected in the reverse bias direction between the terminals a and b, and provided with pull-up / down means for raising or lowering the potential of the control terminal ct1. 11. The switching circuit according to claim 10, wherein a load resonance means for directly or equivalently forming a series resonance means with a load is connected between the main terminal mt1a and the main terminal mt2a, and the pull-up / down means is provided. Operates to assist the resonance operation of the load resonance means based on the direction of the current of the load resonance means. 12. One of the first and second controllable switching means has a self-holding function, and is actually or equivalently a combination of a plurality of controllable switching means. One of the controllable switching means is a pull-up switch of the pull-up / down switch.
The resonance type power conversion circuit according to claim 11, wherein the resonance type power conversion circuit performs an up or pull down function. 13. A method according to claim 11, wherein one of said first and second controllable switching means is a plurality of controllable switching means cascade-connected or similarly directly connected. Resonant power conversion circuit.