JP7419890B2 - power supply - Google Patents

Description

The present disclosure relates to a power supply device.

A power source that uses the induced current generated by the current flowing through the power line by installing a CT (current transformer) on the power line as a means of easily supplying power to equipment used near power lines such as power transmission lines. A device is known (for example, see Patent Document 1).

Patent No. 6351884

In a typical CT, when a primary current flows through a primary electric wire (primary electric wire), a secondary current flows through a secondary electric wire (secondary electric wire) at a certain fixed current ratio. However, the primary current flowing through a primary electric wire such as the above-mentioned power line is determined by the output of the power supply source and the amount of power required by the power supply destination, and therefore may vary greatly. Therefore, when fluctuations in the primary current increase, it becomes difficult to stably supply power to the load when the induced current generated by the primary current is used to supply power to the load.

The present disclosure provides a power supply device that can stably supply power to a load even if the primary current fluctuates.

This disclosure:
A power supply device that supplies power to a load,
a current transformer that outputs a secondary current from a secondary electric wire to the load side according to magnetic flux generated by a primary current flowing through the primary electric wire;
a tertiary electric wire provided in a magnetic path through which the magnetic flux passes;
A power supply device is provided, including a control circuit that controls the secondary current by flowing a control current through the tertiary electric wire.

According to the present disclosure, it is possible to provide a power supply device that can stably supply power to a load even if the primary current fluctuates.

FIG. 2 is a diagram showing a configuration example of a power supply device in the first embodiment. FIG. 3 is an image diagram of current phase and power distribution. FIG. 3 is a diagram illustrating functional blocks of a control circuit of the power supply device in the first embodiment. FIG. 3 is a diagram illustrating a control flow executed by a control circuit of the power supply device in the first embodiment. It is a figure showing the example of composition of the power supply device in a 2nd embodiment. FIG. 7 is a diagram illustrating a control block of a control circuit of a power supply device in a second embodiment. FIG. 7 is a diagram illustrating a control flow executed by a control circuit of a power supply device in a second embodiment. It is a figure which illustrates the magnetic characteristic (BH curve) of a magnetic core.

Embodiments according to the present disclosure will be described below. A power supply device according to an embodiment of the present disclosure supplies power to a load by using an induced current induced by a primary current flowing in a primary electric wire such as a power transmission/distribution line or a ground wire. .

The power supply device according to the present disclosure is mounted on a train using, for example, an induced current (an example of a secondary current) induced by a current collecting current (an example of a primary current) collected on a train by a pantograph. Supply power to equipment (an example of a load). Note that the usage example of the power supply device is not limited to this.

FIG. 1 is a diagram showing a configuration example of a power supply device in the first embodiment. The power supply device 101 shown in FIG. 1 supplies DC power Pc of DC voltage Vc to the load 40 using a secondary current ia induced by a primary current ie flowing through the primary electric wire 11. The power supply device 101 includes a current transformer 14 and a control circuit 50.

The current transformer 14 outputs a secondary current ia from the secondary electric wire 12 to the load 40 side in accordance with the magnetic flux φ generated by the primary current ie flowing through the primary electric wire 11. The current transformer 14 converts the primary current ie flowing through the primary wire 11 into a secondary current ia flowing from the secondary wire 12 toward the load 40 by electromagnetic induction. The current transformer 14 is installed, for example, so as to surround the primary electric wire 11. A secondary electric wire 12 and a tertiary electric wire 13 are installed in the current transformer 14. The current transformer 14 has a magnetic core 10 around which a secondary wire 12 and a tertiary wire 13 are wound. The magnetic core 10 is an example of a magnetic path through which the magnetic flux φ passes. Although shown in a simplified manner in the drawings, the secondary electric wire 12 and the tertiary electric wire 13 are each wound around the magnetic core 10 for at least one turn or more.

The secondary electric wire 12 is, for example, a winding wire wound around the magnetic core 10 in n turns (n represents the number of turns of 2 or more). When a control current id, which will be described later, is not flowing through the tertiary wire 13, the AC secondary current is applied at a current ratio of 1:n so as to prevent changes in the magnetic flux φ generated in the magnetic core 10 by the AC primary current ie. ia flows into the secondary electric wire 12.

The tertiary electric wire 13 is provided in a magnetic path (in the example of FIG. 1, the magnetic core 10) through which the magnetic flux φ passing through the secondary electric wire 12 flows. In this example, the tertiary wire 13 is a winding wound around the magnetic core 10 with fewer than n turns.

The control circuit 50 causes a control current id to flow through the tertiary electric wire 13 to control the secondary current ia. By causing the control current id to flow through the tertiary wire 13, the magnitude of the magnetic flux φ passing through the secondary wire 12 changes, so the 1:n current ratio of the current transformer 14 changes. Therefore, by causing the control current id to flow through the tertiary electric wire 13, the magnitude of the secondary current ia is not fixed depending on the magnitude of the primary current ie. Therefore, even if the primary current ie varies greatly, the secondary current ia flowing from the secondary electric wire 12 to the load 40 side can be controlled, so that the DC power Pc can be stably supplied to the load 40.

For example, the control circuit 50 causes the control current ia to flow through the tertiary electric wire 13 so that fluctuations in the secondary current ia are suppressed. As a result, even if the magnitude and fluctuation range of the primary current ie flowing through the primary electric wire 11 becomes relatively large, excessive fluctuations in the secondary current ia can be suppressed, so that DC power Pc can be more stably supplied to the load 40. .

For example, the control circuit 50 changes the control current id according to the detection result of the secondary current ia. Thereby, the control current id generated by feedback control that reflects the detection result of the secondary current ia on the control current id can be passed through the tertiary electric wire 13, so the secondary current ia can be controlled with high precision, and as a result, DC power Pc can be more stably supplied to the load 40.

For example, the control circuit 50 causes the control current id to flow through the tertiary electric wire 13 so that the maximum current value of the secondary current ia does not exceed an upper limit current value (in this example, referred to as an upper limit current value A). This enables feedback control in which the control current id is caused to flow through the tertiary wire 13 so that the maximum current value of the secondary current ia does not exceed the upper limit current value A. Therefore, the secondary current id can be controlled with high precision so that the maximum current value does not exceed the upper limit current value A, and as a result, the DC power Pc can be more stably supplied to the load 40.

For example, the control circuit 50 causes the control current id to flow through the tertiary wire 13 so that the current value of the secondary current ia falls within a certain range (referred to as a certain range B in this example). This enables feedback control in which the control current id is caused to flow through the tertiary wire 13 so that the current value of the secondary current ia falls within a certain range B. Therefore, the secondary current id can be controlled with high precision so that the current value falls within the certain range B, and as a result, the DC power Pc can be more stably supplied to the load 40. Note that the upper limit value of the certain range B may be set to the same value as the upper limit current value A, or may be set to a value lower than the upper limit current value A. When a lower limit current value C, which will be described later, is set, the lower limit value of the fixed range B is set to a value higher than the lower limit current value C.

For example, when the maximum current value of the secondary current ia is higher than the lower limit current value (in this example, the lower limit current value C), the control circuit 50 causes the control current id to flow through the tertiary electric wire 13, so that the maximum current value of the secondary current ia When the current value is lower than the lower limit current value C, flowing the control current id through the tertiary electric wire 13 is stopped. As a result, when the maximum current value of the secondary current id is lower than the lower limit current value C, the control current id does not flow to the tertiary wire 13 (the induced current induced by the flow of the primary current ie does not flow to the tertiary wire 13). Yes).

The fact that the maximum current value of the secondary current id is lower than the lower limit current value C means that fluctuations in the primary current ie are relatively small. Therefore, in such a case, the DC power Pc can be stably supplied to the load 40 based on the AC power pa supplied from the secondary wire 12 without controlling the secondary current ia using the control current id. can. Furthermore, since the control current id is stopped from flowing through the tertiary wire 13, the power required to flow the control current id through the tertiary wire 13 can be reduced, and as a result, the power consumption of the power supply device 101 can be reduced. The ability to reduce power consumption is a particularly advantageous effect when the power available from the primary wire 11 is relatively low.

The power supply device 101 includes, for example, a rectifier 20. The rectifier 20 is an AC/DC converter that converts the AC power pa supplied from the secondary electric wire 12 into DC power Pb of a DC voltage Vb, and outputs the DC power Pb to the load 40 side. By providing the rectifier 20, AC power pa can be converted into desired DC power Pb. The rectifier 20 includes, for example, a rectifier circuit 21 and a smoothing circuit 22. The rectifier circuit 21 is a circuit that rectifies alternating current into direct current, and is, for example, a full-wave rectifier circuit formed by a plurality of diodes. The smoothing circuit 22 is a circuit that smoothes and outputs the DC power Pb output from the rectifier circuit 21, and is, for example, a CR circuit including a capacitor C and a resistor R.

For example, the control circuit 50 causes the control current id to flow through the tertiary wire 13 so that an increase in the output voltage Vb of the rectifier 20 is suppressed. Thereby, even if the magnitude and fluctuation range of the primary current ie flowing through the primary electric wire 11 becomes relatively large, an excessive rise in the output voltage Vb can be suppressed, so that the DC power Pc can be more stably supplied to the load 40.

For example, the control circuit 50 changes the control current id according to the detection result of the output voltage Vb of the rectifier 20. As a result, the control current id generated by feedback control that reflects the detection result of the output voltage Vb on the control current id can be passed through the tertiary electric wire 13, so the output voltage Vb can be controlled with high precision, and as a result, the load 40 DC power Pc can be more stably supplied to.

For example, the control circuit 50 controls the control current id so that the value of the output voltage Vb of the rectifier 20 (output voltage value Vbb) does not exceed an upper limit voltage value (in this example, referred to as an upper limit voltage value D). flow to. This enables feedback control in which the control current id is caused to flow through the tertiary wire 13 so that the output voltage value Vbb does not exceed the upper limit voltage value D. Therefore, the output voltage Vb can be controlled with high precision so that the output voltage value Vbb does not exceed the upper limit voltage value D, and as a result, the DC power Pc can be more stably supplied to the load 40.

For example, the control circuit 50 causes the control current id to flow through the tertiary wire 13 so that the output voltage value Vbb of the rectifier 20 converges to a constant voltage value (referred to as a constant voltage value E in this example). This enables feedback control in which the control current id is caused to flow through the tertiary wire 13 so that the output voltage value Vbb converges to the constant voltage value E. Therefore, the secondary voltage Vb can be controlled with high precision so that the output voltage value Vbb converges to the constant voltage value E, and as a result, the DC power Pc can be more stably supplied to the load 40. Note that the constant voltage value E may be set to the same value as the upper limit voltage value D, or may be set to a value lower than the upper limit voltage value D. When a lower limit voltage value F, which will be described later, is set, the constant voltage value E is set to a value higher than the lower limit voltage value F.

For example, the control circuit 50 causes the control current id to flow through the tertiary wire 13 when the output voltage value Vbb of the rectifier 20 is higher than the lower limit voltage value (in this example, the lower limit voltage value D). On the other hand, when the output voltage value Vbb of the rectifier 20 is lower than the lower limit voltage value F, the control circuit 50 stops flowing the control current id to the tertiary electric wire 13. As a result, when the output voltage value Vbb of the rectifier 20 is lower than the lower limit voltage value F, the control current id does not flow to the tertiary wire 13 (the induced current induced by the flow of the primary current ie does not flow to the tertiary wire 13). be).

The fact that the output voltage value Vbb of the rectifier 20 is lower than the lower limit voltage value F means that the fluctuation in the primary current ie is relatively small. Therefore, in such a case, the DC power Pc can be stably supplied to the load 40 based on the AC power pa supplied from the secondary wire 12 without controlling the secondary current ia using the control current id. can. Furthermore, since the control current id is stopped from flowing through the tertiary wire 13, the power required to flow the control current id through the tertiary wire 13 can be reduced, and as a result, the power consumption of the power supply device 101 can be reduced. The ability to reduce power consumption is a particularly advantageous effect when the power available from the primary wire 11 is relatively low.

For example, the control circuit 50 generates the control current id using the surplus power Pr of the DC power Pb output from the rectifier 20 excluding the DC power Ps supplied to the load 40 side. Thereby, the surplus power Pr can be used for the power required to generate the control current id, so even if the DC power Pb is generated in excess, the waste of the DC power Pb can be suppressed and the DC power Pb can be used efficiently.

The power supply device 101 includes, for example, a DC/DC converter 31. The DC/DC converter 31 is an example of a first DC/DC converter that converts DC power Pb or DC power Ps into DC power Pc to be supplied to the load 40 side. By providing the DC/DC converter 31, the DC voltage Vb can be converted into a desired DC voltage Vc. The DC/DC converter 31 is controlled by, for example, an arithmetic unit 53 of the control circuit 50, which will be described later. Arithmetic device 53 controls DC/DC converter 31 so that DC voltage Vc becomes a predetermined constant voltage.

The power supply device 101 may include a power storage device 34 connected to the output path 35 of the DC/DC converter 31 so as to be able to supply power to the load 40 . By providing the power storage device 34, power can be continuously supplied from the power storage device 34 to the load 40 even during a period when the DC power Pc is not supplied from the DC/DC converter 31 (for example, a period when the primary current ie does not flow). . The power storage device 34 can be charged with the DC voltage Vc output from the DC/DC converter 31 during the period when the primary current ie is flowing. Note that the diode 33 inserted in series in the output path 35 is for backflow prevention. Furthermore, a DC/DC converter capable of bidirectional voltage conversion may be inserted between the power storage device 34 and the output path 35 under the control of the arithmetic unit 53 of the control circuit 50.

Next, a configuration example of the control circuit 50 will be explained.

The control circuit 50 includes a DC/DC converter 32, a voltage detection circuit 51, a transformer 62, a current detection circuit 52, an arithmetic unit 53, a DA 54, an LPF 55, and a driver 61.

The DC/DC converter 32 is an example of a second DC/DC converter that generates a power supply voltage Vd for internal control of the control circuit 50, and converts a DC output voltage Vb to a DC power supply voltage Vd. It is desirable that the power supply voltage Vb generated by the DC/DC converter 32 is smaller than the output voltage Vc of the DC/DC converter 31.

Voltage detection circuit 51 detects output voltage Vb (specifically, output voltage value Vbb). The voltage detection circuit 51 converts, for example, an analog output voltage value Vbb into a digital voltage detection value v1 using a converter AD1. That is, the voltage detection value v1 represents the detection value of the output voltage value Vbb.

The current detection circuit 52 detects the value of the secondary current ia (secondary current value iaa). Current detection circuit 52 detects secondary current value iaa using, for example, transformer 62 and converter AD2. Transformer 62 has a primary winding attached to wiring through which secondary current ia flows, and a secondary winding connected to the analog input side of converter AD2. A secondary voltage value ve corresponding to the secondary current value iaa is generated in the secondary winding of the transformer 62. The current detection circuit 52 converts the analog secondary voltage value ve into a digital current detection value v2 using a converter AD2. That is, the detected current value v2 represents the detected value of the secondary current value iaa.

The arithmetic device 53 is a processor for realizing each function of the control circuit 50, and is, for example, a microprocessor unit. Each function of the control circuit 50 is realized by the operation of the arithmetic unit 53 according to a program stored in a memory. The arithmetic device 53 outputs a command sine wave Ss for generating a control current id to be passed through the tertiary electric wire 13 according to the voltage detection value v1 and the current detection value v2. Arithmetic device 53 operates using power supply voltage Vd.

DA54 is a DA (Digital to Analog) converter that converts a digital command sine wave Ss into an analog command voltage. The LPF 55 smoothes the analog command voltage and outputs it to the driver 61.

The driver 61 is a current driver circuit that outputs a control current id in response to an analog command voltage corresponding to the command sine wave Ss. The driver 61 is, for example, a full bridge circuit in which both ends of the tertiary electric wire 13 are connected to a current output section. The driver 61 generates the control current id using the surplus power Pr.

FIG. 2 is an image diagram of the current phase and power distribution. The waveform ia0 represents the secondary current ia generated in the secondary electric wire 12 by the alternating current primary current ie flowing through the primary electric wire 11 when the control current id is not flowing through the tertiary electric wire 13. The waveform ia1 represents the secondary current ia generated in the secondary electric wire 12 by the alternating current primary current ie flowing through the primary electric wire 11 when the control current id having the opposite phase to the secondary current ia is flowing through the tertiary electric wire 13. represent. In this way, the control circuit 50 can suppress fluctuations in the secondary current ia flowing through the secondary electric wire 12 by causing the driver 61 to flow the control current id having the opposite phase to the secondary electric wire 13 through the tertiary electric wire 13.

Therefore, even if the AC power pa generated in the secondary electric wire 12 becomes excessive due to an excessive primary current ie, the excessive AC power pa can be suppressed. That is, even if fluctuations in the primary current ie increase, the DC power Pc generated based on the AC power pa can be stably supplied to the load 40. Furthermore, by flowing the control current id in this way, the AC power pa generated in the secondary electric wire 12 by the primary current ie is balanced between the power supplied to the load 40 side and the power supplied to the control circuit 50 side. Since the power is distributed as follows, heat generation due to wasted power can be suppressed. For example, if the AC power pa generated when the control current id is not flowing is 10 W, the power consumption of the control circuit 50 excluding the driver 61 is 5 W, and the power consumption of the driver 61 is 4 W, then the power consumption is supplied to the load 40 side. The DC power Ps or the DC power Pc is 1W.

The arithmetic device 53 acquires, for example, 16 or more current detection values v2 from the current detection circuit 52 per cycle of the primary current ie. When the commercial frequency is 60 Hz, the arithmetic unit 53 obtains the secondary current value iaa at a sampling frequency of 960 Hz. The higher the sampling frequency is, the more advantageous it is in that it can handle even a primary current ie with a high frequency. The lower limit of the sampling frequency is, for example, the Nyquist frequency of 120 Hz or more (samples at two or more points). The arithmetic device 53 can acquire phase information of the secondary current ia by sampling the secondary current value iaa at such a predetermined sampling period. Using this phase information, the arithmetic device 53 generates a command sine wave Ss for causing the driver 61 to output a control current id having an opposite phase to the secondary current ia. On the other hand, the arithmetic device 53 can obtain amplitude information of the secondary current ia by obtaining the voltage detection value v1 from the voltage detection circuit 51.

For example, the calculation device 53 uses these phase information and amplitude information to output a control current id having an opposite phase to the secondary current ia to the driver 61 so that the voltage detection value v1 becomes a constant target value REF. A command sine wave Ss to cause the command to be generated is generated. The arithmetic device 53 outputs a command sine wave Ss to the DA 54. It is desirable that the output timing (frequency) of the DA 54 be higher. However, it is preferable to synchronize the output frequency of DA54 with the sampling frequency of converters AD1 and AD2 from the viewpoint of realizing simple control. The target value REF corresponds to the constant voltage value E described above.

FIG. 3 is a diagram illustrating functional blocks of the control circuit of the power supply device in the first embodiment. Arithmetic device 53 of control circuit 50 generates command sine wave Ss based on classical control as shown in FIG. 3, using amplitude information acquired from converter AD1 and phase information acquired from converter AD2. The arithmetic device 53 uses the subtracter 71 to calculate the deviation ERROR between the target value REF and the voltage detection value v1. The arithmetic device 53 performs PI control (proportional control 72 and integral control 73) so that the deviation ERROR becomes zero, and adds the control data of the proportional control 72 and the control data of the integral control 73 using the adder 74. , generates amplitude information of the command sine wave Ss. The arithmetic unit 53 multiplies the amplitude information of the command sine wave Ss by the phase information of the secondary current ia using a multiplier 75, thereby generating a command sine wave for generating a control current id having an opposite phase to the secondary current ia. Generate Ss. As the amplitude of the command sine wave Ss increases, the amplitude of the control current id also increases.

With this functional block, the arithmetic unit 53 uses the phase information and amplitude information of the secondary current ia to generate a control current having an opposite phase to the secondary current ia so that the voltage detection value v1 becomes a constant target value REF. A command sine wave Ss for causing the driver 61 to output the ID can be generated.

FIG. 4 is a diagram illustrating a control flow executed by the control circuit of the power supply device in the first embodiment. The arithmetic unit 53 of the control circuit 50 may generate the command sine wave Ss based on classical control as shown in FIG. You can.

In step S110, arithmetic device 53 reads voltage detection value v1 from converter AD1. In step S120, the calculation device 53 reads the target value REF and compares the detected voltage value v1 with the target value REF. When the calculation device 53 determines that the voltage detection value v1 is higher than the target value REF, it increases the amplitude of the command sine wave Ss (step S130), and when it determines that the voltage detection value v1 is lower than the target value REF. , decreases the amplitude of the command sine wave Ss (step S150). When the calculation device 53 determines that the voltage detection value v1 is the same as the target value REF, the calculation device 53 maintains the amplitude of the command sine wave Ss without changing it (step S140). As the amplitude of the command sine wave Ss increases, the amplitude of the control current id also increases.

Through this sequence control, the arithmetic unit 53 uses the phase information and amplitude information of the secondary current ia to generate a control current having an opposite phase to the secondary current ia so that the voltage detection value v1 becomes a constant target value REF. A command sine wave Ss for causing the driver 61 to output the ID can be generated.

FIG. 5 is a diagram illustrating a configuration example of a power supply device in the second embodiment. Descriptions of configurations and effects similar to those of the above embodiments will be omitted or simplified by referring to the above descriptions. The power supply device 102 in the second embodiment differs from the power supply device 101 in the first embodiment in that the control circuit 50 causes a DC control current id to flow through the tertiary electric wire 13 . The control circuit 50 can control the secondary current ia output from the secondary electric wire 12 because the BH curve (magnetic hysteresis curve) of the magnetic core 10 is offset by flowing the DC control current id through the tertiary electric wire 13. .

When the control current id is not applied to the tertiary wire 13 (no control shown in FIG. 8), the center of the BH curve is used, so the secondary current ia becomes large and the AC power pa generated in the secondary wire 12 also becomes large. On the other hand, when the control current id flowing through the tertiary wire 13 is increased (during DC control in FIG. 8), the saturated region of the BH curve is used, so the secondary current ia becomes smaller, and the AC generated in the secondary wire 12 Power pa also becomes smaller. B represents magnetic flux density, H represents magnetic field, Br represents residual magnetic flux density, and Hc represents coercive force.

FIG. 6 is a diagram illustrating control blocks of the control circuit of the power supply device in the second embodiment. The arithmetic unit 56 of the control circuit 50 uses amplitude information acquired from the converter AD1 based on the classical control as shown in FIG. is used to generate the command DC voltage Sb. The arithmetic unit 56 uses a subtracter 71 to calculate the deviation ERROR between the target value REF and the voltage detection value v1. The calculation device 56 performs PI control (proportional control 72 and integral control 73) so that the deviation ERROR becomes zero, and adds the control data of the proportional control 72 and the control data of the integral control 73 using the adder 74. , generates a command DC voltage Sb. As the command DC voltage Sb increases, the amplitude of the control current id increases.

In the case of FIG. 6, the amplitude information acquired from converter AD1 is information obtained by smoothing the amplitude of secondary current ia, so arithmetic unit 56 calculates voltage detection value v1 at a frequency lower than the AC frequency of primary current ie. get. Similarly, the output frequency of the DA 54 is lower than the AC frequency of the primary current ie.

With this functional block, the calculation device 56 uses the amplitude information of the secondary current ia to issue a command to the driver 61 to output the DC control current id so that the detected voltage value v1 becomes a constant target value REF. DC voltage Sb can be generated.

FIG. 7 is a diagram illustrating a control flow executed by the control circuit of the power supply device in the second embodiment. The arithmetic unit 53 of the control circuit 50 may generate the command DC voltage Sb based on classical control as shown in FIG. 6, but may also generate the command DC voltage Sb by sequence control as shown in FIG. You can.

In step S210, arithmetic device 56 reads voltage detection value v1 from converter AD1. In step S220, the calculation device 56 reads the target value REF and compares the detected voltage value v1 with the target value REF. When the calculation device 56 determines that the voltage detection value v1 is higher than the target value REF, it increases the command DC voltage Sb (step S230), and when it determines that the voltage detection value v1 is lower than the target value REF, it increases the command DC voltage Sb. The DC voltage Sb is decreased (step S250). When the calculation device 56 determines that the voltage detection value v1 is the same as the target value REF, the calculation device 56 maintains the command DC voltage Sb without changing it (step S240). As the command DC voltage Sb increases, the amplitude of the control current id increases.

Through this sequence control, the arithmetic unit 56 uses the amplitude information of the secondary current ia to issue a command to the driver 61 to output the DC control current id so that the detected voltage value v1 becomes a constant target value REF. DC voltage Sb can be generated.

Although the power supply device has been described above using the embodiments, the present invention is not limited to the above embodiments. Various modifications and improvements, such as combinations and substitutions with part or all of other embodiments, are possible within the scope of the present invention.

10 Magnetic core 11 Primary wire 12 Secondary wire 13 Tertiary wire 14 Current transformer 20 Rectifier 21 Rectifier circuit 22 Smoothing circuit 31, 32 DC/DC converter 33 Diode 34 Power storage device 35 Output path 40 Load 50 Control circuit 51 Voltage detection circuit 52 Current Detection circuit 53 Arithmetic device 54 DA
55 LPF
61 Driver 62 Transformer 101, 102 Power supply device

Claims (15)

A power supply device that supplies power to a load,
a current transformer that outputs a secondary current from a secondary electric wire to the load side according to magnetic flux generated by a primary current flowing through the primary electric wire;
a tertiary electric wire provided in a magnetic path through which the magnetic flux passes;
and a control circuit that controls the secondary current by flowing a control current through the tertiary electric wire ,
The control circuit is a power supply device that changes the control current according to a detection result of the secondary current . The power supply device according to claim 1, wherein the control circuit causes the control current to flow through the tertiary wire so that fluctuations in the secondary current are suppressed. The power supply device according to claim 1 or 2, wherein the control circuit causes the control current to flow through the tertiary electric wire so that a maximum current value of the secondary current does not exceed an upper limit current value. The power supply device according to any one of claims 1 to 3 , wherein the control circuit causes the control current to flow through the tertiary wire so that the current value of the secondary current falls within a certain range. The control circuit causes the control current to flow through the tertiary wire when the maximum current value of the secondary current is higher than the lower limit current value, and when the maximum current value of the secondary current is lower than the lower limit current value, The power supply device according to any one of claims 1 to 4 , wherein the control current is stopped from flowing through the tertiary electric wire. A power supply device that supplies power to a load,
a current transformer that outputs a secondary current from a secondary electric wire to the load side according to magnetic flux generated by a primary current flowing through the primary electric wire;
a tertiary electric wire provided in a magnetic path through which the magnetic flux passes;
a control circuit that controls the secondary current by flowing a control current through the tertiary electric wire ;
a rectifier that converts the power supplied from the secondary electric wire into DC power and outputs it to the load side,
The control circuit is a power supply device that changes the control current according to a detection result of the output voltage of the rectifier . The power supply device according to claim 6 , wherein the control circuit causes the control current to flow through the tertiary wire so that an increase in the output voltage of the rectifier is suppressed. The power supply device according to claim 6 , wherein the control circuit causes the control current to flow through the tertiary wire so that the output voltage value of the rectifier does not exceed an upper limit voltage value. The power supply device according to any one of claims 6 to 8, wherein the control circuit causes the control current to flow through the tertiary wire so that the output voltage value of the rectifier converges to a constant voltage value. The control circuit causes the control current to flow through the tertiary wire when the output voltage value of the rectifier is higher than the lower limit voltage value, and causes the control current to flow when the output voltage value of the pre-rectifier is lower than the lower limit voltage value. The power supply device according to claim 6 , wherein the power supply device stops flowing through the tertiary electric wire. The power supply device according to any one of claims 6 to 10 , wherein the control circuit generates the control current using surplus power excluding power supplied to the load side from the DC power. The power supply device according to any one of claims 6 to 11 , comprising a DC/DC converter that converts the DC power to DC power to be supplied to the load side. A power supply device that supplies power to a load,
a current transformer that outputs a secondary current from a secondary electric wire to the load side according to magnetic flux generated by a primary current flowing through the primary electric wire;
a tertiary electric wire provided in a magnetic path through which the magnetic flux passes;
a control circuit that controls the secondary current by flowing a control current through the tertiary electric wire ;
a rectifier that converts the power supplied from the secondary electric wire into DC power and outputs it to the load side;
a DC/DC converter that converts the DC power to DC power to be supplied to the load side;
A power supply device comprising: a power storage device connected to an output path of the DC/DC converter so as to be able to supply power to the load . The power supply device according to any one of claims 1 to 13 , wherein the control circuit causes the control current having an opposite phase to the secondary current to flow through the tertiary electric wire. A power supply device that supplies power to a load,
a current transformer that outputs a secondary current from a secondary electric wire to the load side according to magnetic flux generated by a primary current flowing through the primary electric wire;
a tertiary electric wire provided in a magnetic path through which the magnetic flux passes;
a control circuit that controls the secondary current by flowing a control current through the tertiary electric wire ,
The control circuit is a power supply device in which the control current of direct current flows through the tertiary electric wire .

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