JPS6248232A - Superconductive energy transfer circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a superconducting energy transfer circuit, and particularly to a superconducting energy transfer circuit suitable for transferring energy while replenishing the loss of stored energy due to resistance components. I'm busy.

[Background of the invention]

A superconducting energy transfer circuit is a circuit that transfers electromagnetic energy stored in a storage coil made of a superconducting coil to a load, and is being considered as a power supply circuit for nuclear fusion devices, accelerators, etc. The load of this superconducting energy transfer circuit is generally a superconducting coil, called a load coil as opposed to a storage coil.

The superconducting energy transfer circuit consists of two superconducting coils (storage coil, load coil), a capacitor, a semiconductor switch for charging the capacitor, and a capacitor, as described in "Superconducting Energy'-Jinmon" 190 Tei, edited by Masami Masuda. There is a flying capacitor system that can be configured with a semiconductor switch or the like to discharge energy. Although omitted from the diagram on page 190 of "Introduction to Superconducting Energy", the method for storing energy in the storage coil is as follows.

That is, a superconducting switch is connected in parallel to both ends of the storage coil, and a DC excitation power source is connected in parallel to the parallel circuit via a DC breaker.

First, the DC circuit breaker is closed and the superconducting switch is opened, and the storage coil is excited 671i by the DC excitation power source.

When the coil current reaches a predetermined 1 value flow value, the superconducting switch is closed and a closed circuit is created using the storage coil and the Afi Ttl conduction switch.The electromagnetic energy is stored in the storage coil in a state called persistent current mode. do. At this time, the DC circuit breaker is opened to disconnect the DC excitation power source. Thereafter, the energy stored in the storage coil can be transferred to the load coil by controlling the on/off states of the semiconductor switch that charges the capacitor with energy and the semiconductor switch that discharges the charged energy.

In this manner, in the conventional circuit system, after energy is stored in the storage coil, the DC excitation power source that excites the storage coil is disconnected, so that only the stored energy can be transferred to the storage coil to the load coil. In general, there is circuit resistance loss due to circuit components other than the first superconducting coil, and the energy that can be transferred is reduced by this circuit resistance loss. In general, it is not possible to drive a large capacity load coil using a storage coil of small capacity, which poses a problem if such a need arises.

As described in Japanese Patent Application Laid-Open No. 59-205620, a method is described in which a thyristor converter for excitation and a thyristor converter for transfer are directly connected to a storage coil, and the storage coil is energized. This problem arises because the thyristor converter is operated in bypass bare operation (arm short-circuited).

[Purpose of the invention]

The object of the present invention is to supplement the resistance loss of stored energy due to one circuit component in a superconducting energy transfer circuit,
Another object of the present invention is to provide a superconducting energy transfer circuit capable of driving a large-capacity load coil using a small-capacity storage coil.

[Summary of the invention]

Semiconductor elements are connected in parallel between both terminals of a DC excitation power source that stores energy in a storage coil, and these parallel circuits are connected in series with the storage coil.

This DC excitation power supply stores energy in the storage coil, and even during transfer, the single DC excitation power supply control circuit controls the current in the storage coil so that it always matches the set value.

[Embodiments of the invention]

An embodiment of the present invention! r: 1, 1st as explained in Figure 1
In the figure, 1 is a storage coil that stores energy, 2 is a load coil, 3 is a capacitor, 4 and 5 are half-, thyristors that are four-body switches, 6 is a voltage detector, 7 is a current detector, and 8 is a thyristor. 4.5 is a transfer control circuit that controls energy transfer by giving on/off signals; 9 is a thyristor converter that is a DC excitation power source; 10 is a diode; 11.
12 is an 'E1L current detector, 13 is a DC excitation electromagnetic control circuit for multiplying energy in the storage coil and controlling the current of the storage coil, and 14 is a charging circuit.

FIG. 2 shows the configuration of the DC excitation power supply control circuit. In the figure, 131 is a detection current selection circuit, 132 is a constant current control circuit, 133 is a limiter circuit, 134 is an automatic pulse phase shifter, 135 is a gate logic circuit, and 136 is a gate amplifier.

The present invention will be explained in detail using FIGS. 1 and 2. First, when the stored λ coil 1 is excited by the DC excitation power source 9, an external command is given to the gate logic circuit 135 shown in FIG. 2 to deblock it. Next, the gate logic circuit 135
The signal from the DC excitation power supply 9 is passed through the gate amplifier 136.
This gate signal is given to the thyristor to perform rectifier operation. At this time, an on signal Gl is applied to the thyristor 4 from the transfer antibacterial circuit 8 to turn it on, and the storage coil 1 is excited through the path of DC excitation power supply 9 - storage coil 1 - thyristor 4 - DC excitation power supply 9. At this time, the constant current control circuit 132 shown in FIG.
The DC excitation power supply 9 is controlled so that. Storage coil 1
After the current 11 reaches a predetermined value, the capacitor 3 is initially charged by the charging circuit 14 to the lowest value at which the iris 5 can be turned on, with the polarity opposite to that shown. Next, an on signal G2 is applied from the transfer control circuit 8 to the thyristor 5. As a result, the voltage Vc of the capacitor 3 is applied as a reverse voltage to the thyristor 4, so the thyristor 4 is turned off. Therefore,
The voltage Vc of the capacitor 3 is charged to the polarity shown by the current flow of the storage coil 1 and rises. Next, the capacitor′
When the on signal G is applied from the transfer control circuit 8 to the thyristor 4 when the voltage Vc reaches a predetermined value, the capacitor 3
The voltage Vc is now applied to the thyristor 5 as a reverse voltage, and the thyristor 5 is turned off. At this time, since the voltage Vc of the capacitor 3 is applied to the load coil 2, the current 2 of the load coil 2 increases. When the current flow rate 2 of the load coil 2 increases, the voltage of the capacitor 3 is charged again to a polarity opposite to that shown in the figure. In this way, energy can be transferred by controlling the thyristors 4 and 5 with the ON signals G, , G from the transfer control circuit 8. On the other hand, during energy transfer, the DC excitation power supply 9 inputs the currents I3+■ detected by the current detectors 11 and 12 into the DC excitation power supply control circuit 13, and selects the larger one in the detected current selection circuit 131 to control constant current. A circuit 132 compares it with the set value ■r and performs a control calculation. The calculation result is sent to the automatic pulse phase shifter 134 via the limiter circuit 133 as a phase control signal. The pulse signal from the automatic pulse phase shifter 134 is applied as a gate signal G to the thyristor of the DC excitation S power source 9 via a gate logic circuit 135 and a gate amplifier 136.

In addition, the current flow of the storage coil 1 is controlled by the DC excitation power supply 9 so that the current flow always reaches the set value R, and the circuit loss of energy during transfer can be supplemented. During this transfer operation, when the thyristor 5 is turned on and the capacitor 3 is charged with the current of the storage coil 1 in the polarity shown, the charging voltage Ve of the capacitor 3 and the output voltage of the DC excitation power supply 9 are superimposed and accumulated. Coil IK is applied. In the negative part of the output voltage of the DC excitation power source 9, there is a possibility that the voltage will be added to the capacitor voltage 1Evc and exceed the withstand voltage of the storage coil 1.

In particular, since the DC excitation power supply 9 operates to compensate only for circuit losses during transfer, the control angle is close to 90°, and the negative portion of the output voltage becomes large. Therefore, as shown in the figure, a diode IO is connected to both ends of the DC excitation power source 9 to cut off the negative portion.

According to this embodiment, by connecting the parallel circuit of the DC excitation power source 9 and the diode 10 in series with the storage coil 1,
The current I in the storage coil l is maintained without causing an overvoltage in the storage coil 1, not only when the storage coil 1 is excited, but also when energy is transferred from the storage coil 1 to the load coil 2.
Since it is possible to control and operate the motor so that it becomes a predetermined value, it is possible to replenish the amount of energy lost due to the resistance component. Therefore, there is an effect that energy can be transferred while replenishing the energy lost due to the resistance component. In general, since the current 1 of the storage coil 1 can always be kept constant, there is an effect that even if the storage coil 1 has a small capacity, it can drive a large capacity load coil 2.

FIG. 3 shows another embodiment of the invention. The difference from FIG. 1 is that a thyristor 15 is connected in parallel between the terminals of the DC excitation power source 9. FIG. 4 shows the configuration of the DC excitation power supply control circuit in the embodiment of FIG. 3. In Figure 4, the second
What differs from the diagram is that the gate logic circuit 135 configures the gate signal G3 of the DC excitation power supply 9 and the gate signal G4 of the thyristor 15, and blocks and deblocks them using external commands A and B, respectively. be.

The operation of another embodiment of the present invention will be explained using FIGS. 3 and 4. The storage coil 1 is excited by a DC excitation power source 9, and the energy stored in the storage coil 1 is transferred to the thyristor 4.5 via the capacitor 3.
, G2 as a side and the energy transfer from the storage coil to the load coil -\ is the same as in the case of FIG. In Fig. 3, the operation that differs from Fig. 1 is that the DC excitation power supply 9
This is the operation of the thyristor 15 connected in parallel to the terminals of.

That is, when exciting the storage coil 1, an external command A is sent to the gate logic circuit 135 shown in FIG.

B is applied to deblock the gate signals Os and G4 of the DC excitation power source 9 and the thyristor 15, and applied to each via the gate amplifier 136. As a result, the DC excitation power supply 9 performs rectifier operation so that the current 11 of the storage coil 1 becomes the current setting value Ir.
In addition, control is performed to replenish the energy lost in the circuit during transfer.

On the other hand, by applying a continuous gate signal G4 to the thyristor 15, it operates similarly to a diode, and the negative portion of the output voltage of the DC excitation power supply 9 is cut off. This prevents the voltage applied to the storage coil 1 during transfer from exceeding the withstand voltage. Next, when the external command B blocks the gate signal G4 of the thyristor 15, the positive voltage of the output voltage of the DC excitation power supply 9 becomes a reverse voltage, and the thyristor 15 is turned off. Therefore, the DC excitation power source 9 can be operated as an inverse converter by setting the control angle to 90 degrees or more. Thereby, the energy in the energy transfer circuit can be regenerated to the AC system by the DC excitation power supply 9. As described above, according to another embodiment of the present invention, by maintaining the parallel circuit of the DC excitation power source 9 and the thyristor 15 in series with the storage coil 1, not only when the storage coil 1 is excited, but also when the storage coil 1 is excited.
Even during energy transfer, the current flow of the storage coil 1 can be controlled and operated to a predetermined value without generating an overvoltage in the storage coil 1, and energy can be transferred while replenishing energy loss.

Further, there is an effect that a large capacity load coil can be driven using a small capacity storage coil.

In general, by turning off the thyristor 15 and operating the DC excitation power supply 9 as a reverse converter, there is an effect that the energy in the energy transfer circuit can be recovered to the AC system.

Although the Fries capacitor method has been described as an example, similar effects can be obtained by implementing the above-described present invention in other superconducting energy transfer circuits that transfer energy between a storage coil and a load coil via a capacitor. It will be done.

〔Effect of the invention〕

According to the present invention, it is possible to supplement the circuit loss of energy during energy transfer. Furthermore, even if the storage λ coil has a small capacity, it can drive a large capacity load coil.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of one embodiment of the present invention, Figure 2 is a DC excitation 1
3 is a block diagram of the iB1jL source control circuit, FIG. 3 is a circuit diagram of another embodiment of the present invention, and FIG. 4 is a block diagram of the DC excitation source control circuit of FIG. l...Storage coil, 2...Load coil, 3...Capacitor, 4.5...Thyristor, 6...Voltage detector, 7゜11.12...'[il, current detection Vessel, 8...
・Transfer circuit system @ device, 9...DC excitation power supply, 10...
・Diode, 13...DC excitation power supply control circuit,] 4
...Charging circuit.

Claims (1)

[Claims] 1. In a superconducting energy transfer circuit that transfers energy between two superconducting coils serving as energy storage means by charging and discharging a capacitor, a DC excitation power source that excites one of the superconducting coils and a semiconductor element are provided. a parallel circuit is formed by connecting the positive pole side of the DC excitation power source and the cathode side of the semiconductor element, and the negative pole side of the DC excitation power source and the anode side of the semiconductor element, and connecting the parallel circuit to the one superconducting A superconducting energy transfer circuit characterized by being connected in series with a coil. 2. The superelectric energy transfer circuit according to claim 1, wherein the semiconductor element connected to both ends of the DC excitation power source is a diode. 3. The superconducting energy transfer circuit according to claim 1, wherein the semiconductor element connected to both ends of the DC excitation power source is a thyristor.