JP6350381B2 - Control device, transformer device and power supply system - Google Patents

Description

  The present invention relates to a control device that controls the operation of a transformer circuit that transforms an applied voltage and outputs the transformed voltage, and a transformer device and a power supply system including the control device.

  As a power supply system mounted on a vehicle, when the vehicle decelerates, a generator that converts the kinetic energy of the vehicle into DC regenerative power and a DC voltage related to the regenerative power converted by the generator are transformed, and the transformed voltage Has been proposed (see, for example, Patent Document 1). Regenerative power is stored in the battery.

  In the power supply system described in Patent Document 1, the control device controls the operation of the transformer circuit. A charging instruction for instructing charging of the battery is input to the control device. When a charging instruction is input, the control device causes the transformer circuit to transform the voltage output from the generator, and causes the transformed voltage to be output from one end to the capacitor. As a result, the battery is charged. The battery supplies the stored power to the load.

JP 2014-98354 A

  However, when the conducting wire connecting the transformer circuit and the capacitor is disconnected and one end from which the voltage is output from the transformer circuit to the capacitor is opened, the capacitor is not charged. In this case, since the regenerative power is not stored in the capacitor, the generator must generate a large amount of power by consuming the fuel, and the fuel consumption of the vehicle is deteriorated. It is not desirable to leave the situation where one end where the voltage is output from the transformer circuit is open. Therefore, it is necessary to properly detect the opening of one end from which the voltage is output from the transformer circuit, and to prompt the user to repair.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a control device that can properly detect the opening of one end from which a voltage is output from a transformer circuit, and the control device. It is to provide a transformer device and a power supply system provided.

  The control device according to the present invention transforms the voltage applied to the first end, controls the operation and stop of the transformer circuit that outputs the transformed voltage from the second end, and the current value flowing from the second end is In a control device including a circuit control unit that controls a voltage value output from the transformer circuit so as to be a predetermined value, an acquisition unit that acquires a voltage value corresponding to a voltage output from the second end, and the circuit A value related to the first voltage value acquired by the acquisition unit while the control unit stops the operation of the transformer circuit, and the acquisition unit acquired after the circuit control unit operates the transformer circuit A calculation unit that calculates a difference value between values related to the second voltage value, and a difference determination unit that determines whether or not the difference value calculated by the calculation unit is equal to or greater than a difference threshold value.

  In the present invention, the transformer circuit transforms the voltage applied to the first end, and outputs the transformed voltage from the second end to the battery, for example, via the conductor. The voltage value output from the second end is controlled such that the current value flowing from the second end to the battery becomes a predetermined value. When the resistance value of the conductive wire is 0.01 ohm and the predetermined value is 100 amperes, the second end is set such that when the voltage value across the capacitor is 1 volt, a current of 100 amperes flows through the electric wire. Is controlled to 2 volts. In the same case, when the voltage value across the capacitor is 2 volts, the voltage value output from the second end is controlled to 3 volts.

  A voltage value corresponding to the voltage output from the second end, for example, a voltage value obtained by dividing the voltage at the second end is acquired. And the value related to the first voltage value acquired while the operation of the transformer circuit is stopped, for example, the average value of the first voltage value and the value related to the second voltage value acquired after operating the transformer circuit For example, a difference value from the average value of the second voltage values is calculated. Thereafter, it is determined whether or not the calculated difference value is greater than or equal to a difference threshold value.

When the second end is normally connected to the capacitor, as described above, the voltage at the second end gradually rises after the transformer circuit is activated, so the calculated difference value is less than the difference threshold. On the other hand, when the second end from which the transformer circuit outputs a voltage is open, no current flows from the second end, so that the voltage at the second end rapidly rises after the transformer circuit is activated. For this reason, the calculated difference value is greater than or equal to the difference threshold.
As described above, by determining whether or not the calculated difference value is greater than or equal to the difference threshold value, the opening of the second end where the voltage is output from the transformer circuit is properly detected.

  In the control device according to the present invention, the acquisition unit includes the second voltage after a time required until the current value reaches the predetermined value after the circuit control unit operates the transformer circuit. It is characterized by acquiring a value.

  In the present invention, the acquisition of the second voltage value is performed after the time necessary for the current value flowing from the second end to reach a predetermined value after the transformer circuit is activated. Thereby, a difference value is calculated appropriately.

  The control device according to the present invention is characterized in that the value related to the second voltage value is based on a plurality of the second voltage values acquired by the acquisition unit during a predetermined period.

  In the present invention, the value related to the second voltage value is based on a plurality of second voltage values acquired during a predetermined period. For this reason, for example, even when the voltage value at the second end temporarily rises due to disturbance noise, the influence on the calculated difference value is small.

  The control device according to the present invention is characterized in that the value relating to the second voltage value is an average value of the second voltage value.

  In the present invention, since the value related to the second voltage value is an average value of the second voltage value, even if the voltage value at the second end is temporarily increased due to disturbance noise, for example, The value relating to the voltage value does not vary greatly.

  The control device according to the present invention is characterized in that the value relating to the first voltage value is an average value of the first voltage value.

  In the present invention, since the value related to the first voltage value is an average value of the first voltage value, even when the voltage value at the first end temporarily rises due to disturbance noise, for example, The value related to the voltage value does not fluctuate greatly, and the influence of disturbance noise on the calculated difference value is small.

  In the control device according to the present invention, the transformer circuit transforms the output voltage of the generator applied to the first end, outputs the transformed voltage from the second end to the capacitor, and the second end from the second end The current flowing to the battery is a charging current.

  In the present invention, the transformer circuit transforms the output voltage of the generator applied to the first end, and outputs the transformed voltage from the second end to the capacitor. As a result, a charging current flows from the second end where the voltage is output from the transformer circuit to the battery, and the battery is charged.

  The control device according to the present invention includes a current determination unit that determines whether or not the current value is less than a current threshold, and the circuit control unit has the difference value equal to or greater than the difference threshold by the difference determination unit. When the current determination unit determines that the current value is less than the current threshold, the operation of the transformer circuit is stopped.

  In the present invention, when the second end from which the transformer circuit outputs a voltage is normally connected to the capacitor, for example, when the transformer circuit is activated, the difference value is less than the difference threshold as described above. Current flows from the second end. When the second end from which the voltage is output by the transformer circuit is open, as described above, the difference value is equal to or greater than the difference threshold, and the current from the second end regardless of whether or not the transformer circuit is operating. Almost never flows.

When it is determined that the difference value between the value related to the first voltage value and the value related to the second voltage value is greater than or equal to the difference threshold value, and the current value flowing from the second end is determined to be less than the current threshold value, Stop circuit operation.
Thereby, opening of the 2nd end from which a voltage is outputted from a transformer circuit is detected more appropriately, and a transformer circuit does not consume power wastefully.

  The control device according to the present invention is characterized in that the circuit control unit stops the operation of the transformer circuit when the difference determination unit determines that the difference value is equal to or greater than the difference threshold.

  In the present invention, when it is determined that the difference value between the value relating to the first voltage value and the value relating to the second voltage value is greater than or equal to the difference threshold value, that is, the second end from which the voltage is output from the transformer circuit. When the opening of the transformer is detected, the operation of the transformer circuit is stopped. For this reason, the transformer circuit does not waste power.

  A transformer device according to the present invention includes the control device described above, the transformer circuit, a current detection circuit that detects a value related to the current value, and a voltage detection circuit that detects the voltage value. .

  In the present invention, the voltage value output from the transformer circuit is controlled so that the current value indicated by the value detected by the current detection circuit becomes a predetermined value. Further, the voltage value detected by the voltage detection circuit is acquired, and a difference value is calculated based on the acquired voltage value.

  A power supply system according to the present invention includes the above-described transformer device and a capacitor to which a voltage output from the transformer circuit is applied.

  In the present invention, the voltage output from the transformer circuit of the transformer device is applied to the capacitor, and the capacitor is charged.

  According to the present invention, it is possible to properly detect the opening of the second end where the voltage is output from the transformer circuit.

It is a block diagram which shows the principal part structure of the power supply system in this Embodiment. It is a block diagram which shows the principal part structure of a DCDC converter. It is a circuit diagram of a transformer circuit. It is a flowchart which shows the procedure of the detection process which a control part performs. It is a flowchart which shows the procedure of the detection process which a control part performs. It is a timing chart which shows an example of operation of a DCDC converter. It is a timing chart which shows the other example of operation | movement of a DCDC converter.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a main configuration of a power supply system 1 in the present embodiment. The power supply system 1 is suitably mounted on a vehicle, and includes a DCDC converter 10, a first capacitor 11, a second capacitor 12, a generator 13, a load 14, and a notification unit 15. The DCDC converter 10 has a first end, a second end, a third end, and a fourth end.

  With respect to the DCDC converter 10, the first end is connected to the positive electrode of the second capacitor 12 and one end of each of the generator 13 and the load 14, and the second end is connected to the positive electrode of the first capacitor 11 via the conductive wire W1. The third end is connected to the notification unit 15. The negative electrodes of the first capacitor 11 and the second capacitor 12 and the other ends of the generator 13 and the load 14 are grounded.

  At the fourth end of the DCDC converter 10, a charging instruction for instructing charging of the first battery 11, a discharging instruction for instructing discharging of the first battery 11, and a stop instruction for instructing stop of transformation are input.

  When a charging instruction is input, the DCDC converter 10 transforms the voltage applied to the first end to which the second battery 12 and the generator 13 are connected, and the transformed voltage is transmitted from the second end to the lead W1. Output to the first battery 11.

When a discharge instruction is input, the DCDC converter 10 transforms the voltage applied to the second terminal to which the first capacitor 11 is connected, and the transformed voltage is transferred from the first terminal to the second capacitor 12 and the load 14. Output.
When the stop instruction is input, the DCDC converter 10 stops the voltage transformation applied to the first end or the second end. Thereby, charging or discharging of the first battery 11 is stopped. Here, the state in which the DCDC converter 10 stops the transformation is a state in which the DCDC converter 10 can start the transformation again when a charge instruction or a discharge instruction is input, in other words, a charge instruction or a discharge instruction. Is waiting for input.

For example, the DCDC converter 10 detects the opening of the second end caused by the disconnection of the conducting wire W1. When the DCDC converter 10 detects the opening of the second end, the DCDC converter 10 outputs a notification signal indicating the opening of the second end of the DCDC converter 10 from the third end to the notification unit 15.
When the notification signal is input, the notification unit 15 notifies the opening of the second end of the DCDC converter 10 by lighting a lamp (not shown) or displaying a message on a display unit (not shown). Thereby, the user can be prompted to repair the power supply system 1.

  The first battery 11 is, for example, an electric double layer capacitor. When the DCDC converter 10 outputs a voltage from the second end, a voltage is applied across the first capacitor 11 and the first capacitor 11 is charged. When no voltage is output from the second end of the DCDC converter 10, the first capacitor 11 applies the output voltage to the second end of the DCDC converter 10 via the conducting wire W1. The DCDC converter 10 transforms the output voltage of the first battery 11 when a discharge instruction is input. As a result, the first battery 11 is discharged.

  The second battery 12 is, for example, a lead storage battery. When the DCDC converter 10 outputs a voltage from the first end, or when the generator 13 is generating power, a voltage is applied across the second capacitor 12 and the second capacitor 12 is charged. . When the DCDC converter 10 does not output voltage from the first end and the generator 13 does not generate power, the second battery 12 outputs the output voltage to the first end of the DCDC converter 10 and the load 14. Apply to one end.

  The generator 13 converts the kinetic energy of the vehicle into AC regenerative power when, for example, a brake pedal (not shown) is depressed while an accelerator pedal (not shown) is not depressed, and the vehicle is decelerating. . The generator 13 rectifies AC regenerative power into DC regenerative power, and uses the DC voltage related to the rectified regenerative power as an output voltage, the first end of the DCDC converter 10, the positive electrode of the second battery 12, Applied to one end of the load 14.

  The load 14 is an electric device mounted on the vehicle. A voltage output from the first end of the DCDC converter 10, an output voltage of the second battery 12, or an output voltage of the generator 13 is applied between both ends of the load 14. Thereby, the load 14 is supplied with power.

  FIG. 2 is a block diagram showing a main configuration of the DCDC converter 10. The DCDC converter 10 includes a transformer circuit 20, a microcomputer (hereinafter referred to as a microcomputer) 21, current detection circuits 22 and 24, and voltage detection circuits 23 and 25.

The transformer circuit 20 is connected to the microcomputer 21 and the current detection circuits 22 and 24 separately. The current detection circuit 22 is further connected to the positive electrode of the first battery 11 via the conducting wire W1. A voltage detection circuit 23 is connected to a connection node between the current detection circuit 22 and the conductive wire W1. Furthermore, the current detection circuit 22 and the voltage detection circuit 23 are connected to the microcomputer 21 separately. The voltage detection circuit 23 is further grounded. The current detection circuit 24 is further connected to the positive electrode of the second battery 12. A voltage detection circuit 25 is connected to a connection node between the current detection circuit 24 and the second battery 12. Further, the current detection circuit 24 and the voltage detection circuit 25 are connected to the microcomputer 21 separately. The voltage detection circuit 25 is grounded.
A connection node of the current detection circuit 22 and the voltage detection circuit 23 corresponds to the first end of the DCDC converter 10, and a connection node of the current detection circuit 24 and the voltage detection circuit 25 corresponds to the second end of the DCDC converter 10.

The transformer circuit 20 transforms the voltage applied to the first end of the DCDC converter 10, specifically, the output voltage of the second battery 12 or the generator 13 applied to the transformer circuit 20 via the current detection circuit 24. Then, the transformed voltage is output from the second end via the current detection circuit 22. As a result, the voltage output from the second end of the DCDC converter 10 by the transformer circuit 20 is applied between both ends of the first capacitor 11, and the first capacitor 11 is charged. At this time, the current flowing from the second end of the DCDC converter 10 to the first battery 11 is a charging current.
The transformer circuit 20 functions as a transformer circuit.

  Further, the transformer circuit 20 transforms the output voltage of the first capacitor 11 applied to the second end of the DCDC converter 10, specifically, the transformer circuit 20 via the current detection circuit 22, and transforms the transformed voltage, The current is output from the first end via the current detection circuit 24. As a result, the first battery 11 is discharged.

  The current detection circuit 22 detects a voltage value Vic related to a current value flowing from the transformer circuit 20 via the second end of the DCDC converter 10. The current detection circuit 22 includes a resistor R1 and a differential amplifier A1. One end of the resistor R1 is connected to the transformer circuit 20. The other end of the resistor R1 corresponds to the second end of the DCDC converter 10 and is connected to the positive electrode of the first capacitor 11 via a conducting wire W1. A positive terminal and a negative terminal of the differential amplifier A1 are connected to one end and the other end of the resistor R1, respectively. The output terminal of the differential amplifier A1 is connected to the microcomputer 21.

A current flows between the first end of the DCDC converter 10 and the transformer circuit 20 via the resistor R1. The differential amplifier A1 amplifies the voltage across the resistor R1, and outputs the amplified voltage from the output terminal to the microcomputer 21. Since the resistance value of the resistor R1 is constant, the voltage value Vic output from the output terminal of the differential amplifier A1 to the microcomputer 21 increases as the current value flowing from the transformer circuit 20 to the second end of the DCDC converter 10 increases. .
As described above, the voltage value Vic is a value related to the current value flowing from the second end of the DCDC converter 10, and the current detection circuit 22 detects the voltage value Vic.

  The voltage detection circuit 23 detects a voltage value Vc corresponding to the voltage output from the second end of the DCDC converter 10. The voltage detection circuit 23 has resistors R2 and R3. One end of the resistor R2 is connected to the other end of the resistor R1, that is, the second end of the DCDC converter 10. The other end of the resistor R2 is connected to the microcomputer 21 and one end of the resistor R3. The other end of the resistor R3 is grounded.

The resistors R2 and R3 divide the voltage at the second end of the DCDC converter 10 and output the divided voltage to the microcomputer 21. Since the resistance values of the resistors R2 and R3 are constant, the voltage dividing ratio of the resistors R2 and R3 is constant. For this reason, the voltage value Vc output from the connection node of the resistors R2 and R3 to the microcomputer 21 is higher as the voltage value at the second end of the DCDC converter 10 is higher.
As described above, the voltage value Vc is a voltage value corresponding to the voltage output from the second end of the DCDC converter 10, and the voltage detection circuit 23 detects the voltage value Vc.

  Since the resistance values of the resistors R2 and R3 are very large, almost no current flows through the resistors R2 and R3. For this reason, substantially all the current that flows from the transformer circuit 20 to the resistor R <b> 1 flows from the second end of the DCDC converter 10 to the first capacitor 11.

  The current detection circuit 24 detects a voltage value Vib related to a current value flowing from the transformer circuit 20 via the first end of the DCDC converter 10. The current detection circuit 24 includes a resistor R4 and a differential amplifier A2. One end of the resistor R4 is connected to the transformer circuit 20. The other end of the resistor R4 corresponds to the first end of the DCDC converter 10 and is connected to the positive electrode of the second capacitor 12. A positive terminal and a negative terminal of the differential amplifier A2 are connected to one end and the other end of the resistor R4, respectively. The output terminal of the differential amplifier A2 is connected to the microcomputer 21.

A current flows between the first end of the DCDC converter 10 and the transformer circuit 20 via the resistor R4. The differential amplifier A2 amplifies the voltage across the resistor R4 and outputs the amplified voltage from the output terminal to the microcomputer 21. Since the resistance value of the resistor R4 is constant, the voltage value Vib output from the output terminal of the differential amplifier A2 to the microcomputer 21 increases as the current value flowing from the transformer circuit 20 to the first end of the DCDC converter 10 increases. .
As described above, the voltage value Vib is a value related to the current value flowing from the first end of the DCDC converter 10, and the current detection circuit 24 detects the voltage value Vib.

  The voltage detection circuit 25 detects a voltage value Vb corresponding to the voltage output from the first end of the DCDC converter 10. The voltage detection circuit 25 has resistors R5 and R6. One end of the resistor R5 is connected to the other end of the resistor R4, that is, the first end of the DCDC converter 10. The other end of the resistor R5 is connected to the microcomputer 21 and one end of the resistor R6. The other end of the resistor R6 is grounded.

The resistors R5 and R6 divide the voltage at the first end of the DCDC converter 10 and output the divided voltage to the microcomputer 21. Since the resistance values of the resistors R5 and R6 are constant, the voltage dividing ratio of the resistors R5 and R6 is constant. For this reason, the voltage value Vb output from the connection node of the resistors R5 and R6 to the microcomputer 21 is higher as the voltage value at the first end of the DCDC converter 10 is higher.
As described above, the voltage value Vb is a voltage value corresponding to the voltage output from the first end of the DCDC converter 10, and the voltage detection circuit 25 detects the voltage value Vb.

  Since the resistance values of the resistors R5 and R6 are very large, almost no current flows through the resistors R5 and R6. For this reason, substantially all of the current flowing from the transformer circuit 20 to the resistor R4 flows from the first end of the DCDC converter 10 toward the second capacitor 12 and the load 14.

The microcomputer 21 is configured using a semiconductor element and controls the operation and stop of the transformer circuit 20. The microcomputer 21 also converts the voltage value Vic input from the differential amplifier A1 of the current detection circuit 22 and the voltage value Vc input from the connection node of the resistors R2 and R3 of the voltage detection circuit 23. 20 controls the voltage value output from the second end of the DCDC converter 10. Furthermore, the microcomputer 21 converts the voltage value Vib input from the differential amplifier A2 of the current detection circuit 24 and the voltage value Vb input from the connection node of the resistors R5 and R6 of the voltage detection circuit 25. 20 controls the voltage value output from the first end of the DCDC converter 10.
The microcomputer 21 functions as a control device, and the DCDC converter 10 functions as a transformer device.

  The operation of the transformer circuit 20 means that the transformer circuit 20 is transforming. Stopping the transformer circuit 20 means that the transformer is stopped. The state in which the transformer circuit 20 has stopped the transformation is a state in which the DCDC converter 10 can start the transformation again according to the voltage signal input from the microcomputer 21.

  FIG. 3 is a circuit diagram of the transformer circuit 20. The transformer circuit 20 includes N-channel FETs (Field Effect Transistors) 30, 31, 32, 33 and an inductor L1. One end of the resistor R1 of the current detection circuit 22 is connected to the drain of the FET 30. The source of the FET 30 is connected to the drain of the FET 31 and one end of the inductor L1. The source of the FET 31 is grounded.

  The other end of the inductor L1 is connected to the drain of the FET 32 and the source of the FET 33. The source of the FET 32 is grounded. The drain of the FET 33 is connected to one end of the resistor R4 of the current detection circuit 24. The gates of the FETs 30, 31, 32, and 33 are connected to the microcomputer 21 separately.

  Each of the FETs 30, 31, 32, and 33 functions as a switch. For each of the FETs 30, 31, 32, and 33, when the voltage value applied to the gate is equal to or greater than a certain value, a current can flow between the drain and the source. At this time, each of the FETs 30, 31, 32, and 33 is on. For each of the FETs 30, 31, 32, and 33, when the voltage value applied to the gate is less than a certain value, no current flows between the drain and the source. At this time, each of the FETs 30, 31, 32, and 33 is off.

The microcomputer 21 turns on or off the FETs 30, 31, 32, and 33 by adjusting the voltage values applied to the gates of the FETs 30, 31, 32, and 33, respectively.
The microcomputer 21 turns on or off the FETs 30 and 31 in a complementary manner. That is, when one of the FETs 30 and 31 is turned on, the other FET is turned off. When one of the FETs 30 and 31 is turned off, the other FET is turned on. Similarly, the microcomputer 21 turns on or off the FETs 32 and 33 in a complementary manner.

  The microcomputer 21 alternately turns on the FETs 30 and 31 alternately, and further alternately turns on the FETs 32 and 33 alternately. As a result, the transformer circuit 20 operates and the transformer circuit 20 performs transformation.

When transforming the voltage applied to the first end of the DCDC converter 10, the microcomputer 21 turns on the FETs 31, 33, for example. Thereby, in the inductor L1, a current flows from the resistor R4 side toward the resistor R1 side. In the state where the current flows from the resistor R4 side to the resistor R1 side in the inductor L1, the microcomputer 21 alternately turns on the FETs 32 and 33, whereby the transformer circuit 20 is applied to the first end of the DCDC converter 10. Step-down operation is performed to step down the voltage being applied. In the same state, the microcomputer 21 alternately turns on the FETs 30 and 31, whereby the transformer circuit 20 performs a boosting operation to boost the voltage applied to the first terminal of the DCDC converter 10.
Switching from turning on the FET 30 to turning on the FET 31 and switching from turning on the FET 32 to turning on the FET 33 are performed periodically.

  In the inductor L1, when the current is flowing from the resistor R4 side to the resistor R1 side and the FET 33 is on, the current flows to the inductor L1 through the FET 33, and the current value flowing to the inductor L1 has a constant slope. To rise. In the same state, when the FET 32 is on, the inductor L1 is discharged, and the value of the current flowing from one end of the inductor L1 on the resistor R1 side decreases with a constant slope. In the step-down operation, the longer the period during which the FET 33 is on, the higher the voltage value output from the second end of the DCDC converter 10.

  In the inductor L1, when the current is flowing from the resistor R4 side to the resistor R1 side and the FET 31 is on, the current value flowing through the inductor L1 increases. In the same state, when the FET 30 is on, the inductor L1 is discharged, and the value of the current flowing from one end of the inductor L1 on the resistor R1 side decreases with a constant slope. In the step-up operation, the longer the period during which the FET 31 is on, the higher the voltage value output from the second end of the DCDC converter 10.

When transforming the voltage applied to the second end of the DCDC converter 10, the microcomputer 21 turns on the FETs 30 and 32, for example. Thereby, in the inductor L1, a current flows from the resistor R1 side toward the resistor R4 side. In the state in which current flows from the resistor R1 side to the resistor R4 side in the inductor L1, the microcomputer 21 alternately turns on the FETs 30 and 31, whereby the transformer circuit 20 is connected to the second end of the DCDC converter 10. A step-down operation is performed to step down the applied voltage. In the same state, the microcomputer 21 alternately turns on the FETs 32 and 33, whereby the transformer circuit 20 performs a boosting operation to boost the voltage applied to the second terminal of the DCDC converter 10.
Switching from turning on the FET 31 to turning on the FET 30 and switching from turning on the FET 33 to turning on the FET 32 are performed periodically.

  In the inductor L1, when the current flows from the resistor R1 side to the resistor R4 side and the FET 30 is on, the current flows to the inductor L1 via the FET 30, and the current value flowing to the inductor L1 has a constant slope. To rise. In the same state, when the FET 31 is on, the inductor L1 is discharged, and the value of the current flowing from one end of the inductor L1 on the resistor R4 side decreases with a constant slope. In the step-down operation, the longer the period during which the FET 30 is on, the higher the voltage value output from the first end of the DCDC converter 10.

  In the inductor L1, when the current is flowing from the resistor R1 side to the resistor R4 side and the FET 32 is on, the current value flowing through the inductor L1 increases. In the same state, when the FET 33 is on, the inductor L1 is discharged, and the value of the current flowing from one end of the inductor L1 on the resistor R4 side decreases with a constant slope. In the step-up operation, the longer the period during which the FET 32 is on, the higher the voltage value output from the first end of the DCDC converter 10.

The microcomputer 21 controls the voltage value output from the DCDC converter 10 from the first end and the second end by adjusting the ON periods of the FETs 30, 31, 32, and 33, respectively.
Further, the microcomputer 21 causes the transformer circuit 20 to stop the transformation by keeping the FETs 30 and 33 off.

As shown in FIG. 2, the microcomputer 21 includes a control unit 40, input units 41, 42, 43, 44, 45, output units 46, 47, 48, 49, 50, and an A (Analog) / D (Digital) conversion unit. 51, 52, 53, 54, a storage unit 55, and a timer 56.
The control unit 40, the input unit 45, the output units 46, 47, 48, 49, 50, the A / D conversion units 51, 52, 53, 54, the storage unit 55 and the timer 56 are connected by a bus 57.

  The output units 46, 47, 48, and 49 are connected to the gates of the FETs 30, 31, 32, and 33 of the transformer circuit 20 in addition to the bus 57. The A / D converters 51, 52, 53, 54 are connected to the input units 41, 42, 43, 44 in addition to the bus 57. Each of the input units 41, 42, 43, and 44 further includes an output terminal of the differential amplifier A1 of the current detection circuit 22, a connection node of the resistors R2 and R3 of the voltage detection circuit 23, and a differential amplifier A2 of the current detection circuit 24. The output terminal is connected to the connection node of the resistors R5 and R6 of the voltage detection circuit 25. The output unit 50 is connected to the notification unit 15 in addition to the bus 57.

  Each of the input units 41, 42, 43, and 44 has an analog output terminal from the output terminal of the differential amplifier A1, the connection node of the resistors R2 and R3, the output terminal of the differential amplifier A2, and the connection node of the resistors R5 and R6. Voltage values Vic, Vc, Vib, Vb are input. The input units 41, 42, 43, and 44 output analog voltage values Vic, Vc, Vib, and Vb to the A / D conversion units 51, 52, 53, and 54, respectively.

The A / D converter 51 converts the analog voltage value Vic input from the input unit 41 into a digital voltage value Vic. The A / D converter 52 converts the analog voltage value Vc input from the input unit 42 into a digital voltage value Vc. The A / D converter 53 converts the analog voltage value Vib input from the input unit 43 into a digital voltage value Vib. The A / D conversion unit 54 converts the analog voltage value Vb input from the input unit 44 into a digital voltage value Vb.
The voltage values Vic, Vc, Vib, and Vb converted by the A / D conversion units 51, 52, 53, and 54 are acquired from the A / D conversion units 51, 52, 53, and 54 by the control unit 40. The control unit 40 functions as an acquisition unit.

  The input unit 45 receives a charge instruction, a discharge instruction, and a stop instruction. When a charge instruction, a discharge instruction, or a stop instruction is input, the input unit 45 notifies the control unit 40 to that effect.

  The output units 46, 47, 48 and 49 output voltages to the gates of the FETs 30, 31, 32 and 33, and adjust the voltage values applied to the gates of the FETs 30, 31, 32 and 33. As a result, the output units 46, 47, 48, and 49 turn the FETs 30, 31, 32, and 33 on or off, respectively. Each of the output units 46, 47, 48, and 49 turns the FETs 30, 31, 32, and 33 on or off in accordance with instructions from the control unit 40.

The output unit 50 outputs a notification signal in accordance with an instruction from the control unit 40.
The timer 56 starts and stops timing in accordance with instructions from the control unit 40. The time measured by the timer 56 is read from the timer 56 by the control unit 40.

  The storage unit 55 is a non-volatile memory, and the storage unit 55 stores a control program. The control unit 40 has a CPU (Central Processing Unit) (not shown) and executes a control program stored in the storage unit 55 to charge the first battery 11 and discharge the first battery 11. The discharge process to be performed and the detection process to detect the opening of the second end of the DCDC converter 10 are executed.

The control unit 40 instructs the output units 46, 47, 48, and 49 to turn on or off the FETs 30, 31, 32, and 33 included in the transformer circuit 20, respectively. Specifically, each of the FETs 30, 31, 32 and 33 executed by the microcomputer 21 is executed by the control unit 40.
Therefore, the control unit 40 controls the operation and stop of the transformer circuit 20 and controls the voltage value output from the first end and the second end of the DCDC converter 10 by the transformer circuit 20. The control unit 40 also functions as a circuit control unit.

  A constant upper limit voltage value Vi1 is preset for the voltage value Vic, and a constant upper limit voltage value V1 is also preset for the voltage value Vc. In the charging process, the control unit 40 causes the transformer circuit 20 to transform the voltage applied to the first end of the DCDC converter 10, and the transformer circuit 20 outputs the voltage from the second end of the DCDC converter 10 to the first capacitor 11. Increase the voltage value.

  When the voltage value Vic acquired from the A / D conversion unit 51 becomes the upper limit voltage value Vi1 or the voltage value Vc acquired from the A / D conversion unit 52 becomes the upper limit voltage value V1, The voltage value output from the second end of the DCDC converter 10 by the transformer circuit 20 is stopped. Thereafter, the control unit 40 maintains the voltage value output from the second end of the DCDC converter 10. In the charging process, when a stop instruction is input to the input unit 45, the control unit 40 gradually decreases the voltage value output from the second end of the DCDC converter 10 by the transformer circuit 20. Thereafter, the control unit 40 turns off the FETs 30 and 33, causes the transformer circuit 20 to stop the transformation, and ends the charging process.

  The discharging process is also executed by the control unit 40 in the same manner as the charging process. A constant upper limit voltage value Vi2 is preset for the voltage value Vib, and a constant upper limit voltage value V2 is preset for the voltage value Vb. When a discharge instruction is input to the input unit 45, the control unit 40 performs a discharge process. In the discharge process, the control unit 40 causes the transformer circuit 20 to transform the voltage applied to the second end of the DCDC converter 10, and the voltage value that the transformer circuit 20 outputs from the first end of the DCDC converter 10. Raise.

  When the voltage value Vib acquired from the A / D conversion unit 53 becomes the upper limit voltage value Vi2 or the voltage value Vb acquired from the A / D conversion unit 54 becomes the upper limit voltage value V2, The transformer circuit 20 stops increasing the voltage value output from the first end of the DCDC converter 10. Thereafter, the control unit 40 maintains the voltage value output from the first end of the DCDC converter 10. Also in the discharge process, when the stop instruction is input to the input unit 45, the control unit 40 gradually decreases the voltage value output from the first end of the DCDC converter 10 by the transformer circuit 20. Thereafter, the control unit 40 turns off the FETs 30 and 33, causes the transformer circuit 20 to stop the transformation, and ends the discharge process.

  4 and 5 are flowcharts showing a procedure of detection processing executed by the control unit 40. FIG. The control unit 40 starts the detection process when a charging instruction is input to the input unit 45 in a state where the voltage transformation circuit 20 stops the transformation. First, the control unit 40 instructs the timer 56 to start measuring time (step S1). Next, the control unit 40 acquires the digital voltage value Vc from the A / D conversion unit 52 (step S2), and determines whether or not the time measured by the timer 56 is equal to or greater than the first reference time. (Step S3). The first reference time is a predetermined time set in advance and is stored in the storage unit 55.

When it is determined that the measured time is less than the first reference time (S3: NO), the control unit 40 returns the process to step S2, and repeatedly acquires the voltage value Vc until the measured time reaches the first reference time. . When it is determined that the measured time is equal to or greater than the first reference time (S3: YES), the control unit 40 instructs the timer 56 to end the time measurement (step S4). Next, the control unit 40 calculates the first average value of the voltage value Vc that is repeatedly acquired in step S2 until the measured time becomes equal to or longer than the first reference time (step S5).
As described above, the control unit 40 calculates the first average value of the voltage value Vc acquired while the transformer circuit 20 stops the transformation. The first average value is based on a plurality of voltage values Vc repeatedly acquired by the control unit 40 from the time when the timer 56 starts to time until the time measured becomes the first reference time or more. In the present embodiment, the first average value corresponds to a value related to the first voltage value.

  After executing Step S5, the control unit 40 starts the above-described charging process for the first battery 11 (Step S6). After executing Step S6, the control unit 40 executes the charging process in parallel with the detection process.

  After executing step S6, the control unit 40 instructs the timer 56 to start measuring time (step S7), and determines whether the time measured by the timer 56 is equal to or greater than the second reference time. (Step S8). Similarly to the first reference time, the second reference time is a predetermined time set in advance and is stored in the storage unit 55.

When it is determined that the measured time is less than the second reference time (S8: NO), the control unit 40 returns the process to step S8. When it is determined that the measured time is equal to or longer than the second reference time (S8: YES), the control unit 40 instructs the timer 56 to end the time measurement (step S9).
As described above, in the detection process, the control unit 40 waits until the second reference time has elapsed after executing Step S6.

  After executing Step S9, the control unit 40 instructs the timer 56 to start measuring time (Step S10). Next, the control unit 40 acquires the digital voltage value Vc from the A / D conversion unit 52 (step S11), and determines whether or not the time measured by the timer 56 is equal to or greater than the third reference time. (Step S12). Similar to the first reference time and the second reference time, the third reference time is a predetermined time set in advance and is stored in the storage unit 55.

When it is determined that the measured time is less than the third reference time (S12: NO), the control unit 40 returns the process to step S11 and repeatedly acquires the voltage value Vc until the measured time reaches the third reference time. . When it is determined that the measured time is equal to or greater than the third reference time (S12: YES), the control unit 40 instructs the timer 56 to end the time measurement (step S13). Next, the control unit 40 calculates the second average value of the voltage value Vc that is repeatedly acquired in step S11 until the measured time becomes equal to or longer than the third reference time (step S14).
As described above, the control unit 40 acquires the second average value of the voltage value Vc acquired after starting the charging process and causing the transformer circuit 20 to start the transformation. The second average value is based on a plurality of voltage values Vc repeatedly acquired by the control unit 40 from the time when the timer 56 starts to time until the time measured becomes the third reference time or more. In the present embodiment, the second average value corresponds to a value related to the second voltage value.

  Next, the control unit 40 calculates a difference value between the first average value calculated in step S5 and the second average value calculated in step S14 (step S15). Thereafter, the control unit 40 determines whether or not the difference value calculated in step S15 is greater than or equal to a difference threshold (step S16). The difference threshold is a preset constant value and is stored in the storage unit 55. The control unit 40 also functions as a calculation unit and a difference determination unit.

  When it is determined that the difference value is greater than or equal to the difference threshold (S16: YES), the control unit 40 acquires the digital voltage value Vic from the A / D conversion unit 51 (step S17), and the acquired voltage value Vic is the voltage. It is determined whether it is less than the threshold value (step S18). The voltage threshold is a preset constant value and exceeds zero volts. The voltage threshold value is stored in the storage unit 55.

As described above, the voltage value Vic increases as the current value flowing from the transformer circuit 20 to the second end of the DCDC converter 10 increases, and almost no current flows through the resistors R2 and R3 of the voltage detection circuit 23. Therefore, determining whether or not the voltage value Vic is less than the voltage threshold is to determine whether or not the value of the current flowing from the second end of the DCDC converter 10 to the first capacitor 11 is less than the current threshold. Equivalent to. The current threshold value is a current value that flows from the second end of the DCDC converter 10 to the first capacitor 11 when the voltage value Vic is the voltage threshold value. When the voltage value Vic is less than the voltage threshold value, the current value flowing from the second end of the DCDC converter 10 is less than the current threshold value, and when the voltage value Vic is greater than or equal to the voltage threshold value, the current flowing from the second end of the DCDC converter 10 The value is greater than or equal to the current threshold.
The control unit 40 also functions as a current determination unit.

When it is determined that the voltage value Vic is less than the voltage threshold value (S18: YES), the control unit 40 turns off the FETs 30 and 33 to stop the voltage transformation circuit 20 from transforming (Step S19), and ends the charging process. (Step S20). Thereafter, the control unit 40 instructs the output unit 50 to output a notification signal to the notification unit 15 (step S21).
As described above, when the control unit 40 determines that the difference value between the first average value and the second average value is greater than or equal to the difference threshold value and determines that the current value Vic is less than the voltage threshold value, The circuit 20 stops the transformation.

  When it is determined that the difference value is less than the difference threshold value (S16: NO), the control unit 40 determines that the voltage value Vic is equal to or greater than the voltage threshold value (S18: NO), or after executing Step S21 The detection process ends.

FIG. 6 is a timing chart showing an example of the operation of the DCDC converter 10. FIG. 6 shows changes in the current value Ic flowing from the second end of the DCDC converter 10 to the first capacitor 11 and changes in the voltage value Vc. FIG. 6 shows an operation example of the DCDC converter 10 when the DCDC converter 10 and the first battery 11 are normally connected.
Hereinafter, the current value that flows from the second end of the DCDC converter 10 to the first battery 11 when the voltage value Vic is the upper limit voltage value Vi1 is referred to as an upper limit current value I1. Since the upper limit voltage value Vi1 is a constant value, the upper limit current value I1 is also a constant value.

  As described above, when a charging instruction is input to the input unit 45 of the microcomputer 21 included in the DCDC converter 10, the control unit 40 of the microcomputer 21 starts a detection process. The controller 40 repeatedly acquires the voltage value Vc from the A / D converter 52 until the first reference time elapses after the detection process is started, and calculates the first average value of the acquired voltage value Vc. . The control unit 40 starts the charging process after calculating the first average value.

  When the charging process is started, as described above, the control unit 40 causes the transformer circuit 20 to transform the voltage applied to the first end of the DCDC converter 10, and converts the transformed voltage to the second end of the DCDC converter 10. To the first battery 11 through the conductive wire W1. Further, the control unit 40 increases the voltage value output from the second end of the DCDC converter 10 to the first capacitor 11 by the transformer circuit 20. The control unit 40 sets the voltage value output from the second end of the DCDC converter 10 so that the voltage value Vic becomes the upper limit voltage value Vi1, that is, the current value Ic indicated by the voltage value Vic becomes the upper limit current value I1. To control.

  When the upper limit current value I1 is 100 amperes and the resistance value of the conductive wire W1 is 0.01 ohm, when the voltage value across the first capacitor 11 is 1 volt, the control unit 40 is DCDC The voltage value output from the second end of the converter 10 is controlled to 2 (= 100 × 0.01 + 1) volts. As a result, a current of 100 amperes flows through the conductive wire W1. When the first capacitor 11 is charged and the voltage value across the first capacitor 11 rises to 2 volts, the control unit 40 sets the voltage value output from the second end of the DCDC converter 10 to 3 (= 100 × 0.01 + 2) Control to bolt.

  As described above, in the charging process, the voltage value output from the second end of the DCDC converter 10 gradually increases, and the voltage value Vc gradually increases as the voltage value increases. When the voltage value Vc reaches the upper limit voltage value V <b> 1, the control unit 40 maintains the voltage value output from the second end of the DCDC converter 10. Thereafter, since the voltage value output from the second end of the DCDC converter 10 is maintained, the voltage value between both ends of the first capacitor 11 and the output from the second end of the DCDC converter 10 as the charging of the first capacitor 11 proceeds. The difference from the voltage value to be reduced is reduced. As the difference decreases, the current value Ic decreases.

  In the detection process, the control unit 40 waits until the second reference time elapses after the charging process is started, that is, after the transformer circuit 20 is activated. The second reference time is a time required for the current value Ic to reach the upper limit current value I1 from zero amperes when the second end of the DCDC converter 10 is normally connected to the positive electrode of the first capacitor 11. is there. The controller 40 repeatedly acquires the voltage value Vc from the A / D converter 52 until the third reference time elapses after the second reference time elapses, and the second average value of the acquired voltage values Vc is obtained. calculate. A difference between the first average value and the second average value is a difference value.

  The second reference time is the time until the voltage value Vc reaches the upper limit voltage value V1 from zero volts in the charging process executed when the second end of the DCDC converter 10 is normally connected to the first capacitor 11. Shorter than. For this reason, when the 2nd end of the DCDC converter 10 is connected to the 1st electrical storage device 11, a difference value is less than upper limit voltage value V1.

  FIG. 7 is a timing chart showing another example of the operation of the DCDC converter 10. FIG. 7 also shows the transition of the current value Ic and the voltage value Vc, as in FIG. FIG. 7 shows an operation example of the DCDC converter 10 when the second end of the DCDC converter 10 is opened due to, for example, disconnection of the conducting wire W1.

  When the second end of the DCDC converter 10 is open and the transformation of the transformer circuit 20 is stopped, the voltage value Vc is zero volts. For this reason, in the detection process, the voltage value Vc that the control unit 40 acquires from the A / D conversion unit 52 until the first reference time elapses after the charging instruction is input to the input unit 45 is zero volts, The first average value is zero volts.

  When the charging process is started after the first reference time has elapsed, the current value Ic does not increase from zero ampere, so the voltage value is increased from the start of the charging process until the second reference time elapses. The value Vc rises rapidly from zero volts to the upper limit voltage value V1. Thereafter, the voltage value Vc is maintained at the upper limit voltage value V1. Therefore, the voltage value Vc that the control unit 40 acquires from the A / D conversion unit 52 before the third reference time elapses after the second reference time elapses is the upper limit voltage value V1, and the second average value Is the upper limit voltage value V1. Therefore, the difference value between the first average value and the second average value is the upper limit voltage value V1.

  The difference threshold is set to the upper limit voltage value V1 or a voltage value that is less than the upper limit voltage value V1 and close to the upper limit voltage value V1. When the second end of the DCDC converter 10 is opened, the difference value between the first average value and the second average value is equal to or greater than the difference threshold value. When the current value Ic is zero ampere, the voltage value Vic is zero volts. In addition, the voltage threshold exceeds zero volts as described above.

  When the difference value is equal to or greater than the difference threshold value and the voltage value Vic is less than the voltage threshold value, the control unit 40 detects opening of the second end of the DCDC converter 10. At this time, as described above, the control unit 40 causes the output unit 50 to output a notification signal to the notification unit 15, turns off the FETs 30 and 33, and causes the transformer circuit 20 to stop the transformation. The voltage value Vc drops to zero volts due to the stop of the transformation.

  In the microcomputer 21 configured as described above, the control unit 40 determines whether or not the calculated difference value is greater than or equal to the difference threshold value and whether or not the voltage value Vic is less than the voltage threshold value. The opening of the second end of 10 can be detected appropriately. Further, when the control unit 40 detects the opening of the second end of the DCDC converter 10, the control unit 40 stops the transformation of the transformer circuit 20, so that the transformer circuit 20 does not waste power. Further, since the control unit 40 acquires the second voltage value after the second reference time has elapsed since the start of the charging process, the controller 40 appropriately calculates the difference value between the first average value and the second average value. Can do.

  Further, even when the voltage value Vc temporarily rises due to disturbance noise after the charging instruction is input to the input unit 45 until the first reference time elapses, the first average value greatly fluctuates. Absent. Therefore, the influence of disturbance noise on the difference value calculated by the control unit 40 is small. Furthermore, even if the voltage value Vc temporarily rises due to disturbance noise before the third reference time elapses after the second reference time elapses, the second average value does not vary greatly. Therefore, the influence of disturbance noise on the difference value calculated by the control unit 40 is small.

  Note that the difference value calculated by the control unit 40 in the detection process is not limited to the difference value between the first average value and the second average value. The control unit 40 may calculate the difference value using, for example, one voltage value Vc acquired before the charging process is started instead of the first average value. Similarly, the control unit 40 may calculate the difference value using, for example, one voltage value Vc acquired after the second reference time has elapsed since the start of the charging process, instead of the second average value. Good.

  In the detection process, instead of the first average value, the control unit 40 repeatedly acquires a plurality of voltages from the time when the timer 56 starts counting until the time measured by the timer 56 reaches or exceeds the first reference time. The difference value may be calculated using a value based on the value Vc, for example, a median value among the plurality of voltage values Vc. Even in this case, even if the voltage value Vc temporarily rises due to disturbance noise from when the charging instruction is input to the input unit 45 until the first reference time elapses, the value based on the plurality of voltage values Vc. Does not fluctuate significantly. Therefore, the influence of disturbance noise on the difference value calculated by the control unit 40 is small.

  Similarly, instead of the second average value, the control unit 40 is based on a plurality of voltage values Vc obtained repeatedly after the timer 56 starts measuring time until the time measured by the timer 56 reaches or exceeds the third reference time. The difference value may be calculated using a value, for example, a median value among the plurality of voltage values Vc. Even in this case, even if the voltage value Vc temporarily rises due to disturbance noise from the second reference time to the third reference time, the value based on the plurality of voltage values Vc is large. It does not fluctuate. Therefore, the influence of disturbance noise on the difference value calculated by the control unit 40 is small.

  Furthermore, in the detection process, the difference value is the sum of a plurality of voltage values Vc repeatedly acquired by the control unit 40 from the time when the timer 56 starts to time until the time measured by the timer 56 reaches the first reference time or more. It may be a difference value from the sum of a plurality of voltage values Vc repeatedly acquired by the control unit 40 from the time when the timer 56 starts measuring until the time measured by the timer 56 reaches the third reference time or more.

  In the detection process, when the control unit 40 determines that the difference value is equal to or greater than the difference threshold value in step S <b> 16, the control unit 40 causes the timer 56 to start measuring the voltage value until the time measured by the timer 56 exceeds a predetermined time. You may acquire Vic repeatedly. In this case, in step S18, the control unit 40 determines whether or not the average value of the plurality of acquired voltage values Vic is less than the voltage threshold value. In the configuration in which the control unit 40 executes step S18 as described above, for example, even when the voltage value Vic varies temporarily due to disturbance noise, the average value of the voltage value Vic does not vary greatly. .

  Further, the voltage value Vc is not limited to a voltage value obtained by dividing the voltage at the second end of the DCDC converter 10, and may be any voltage value according to the voltage output from the second end of the DCDC converter 10. Good. Therefore, the voltage value Vc may be, for example, the voltage value at the second end of the DCDC converter 10. Similarly, the voltage value Vb is not limited to a voltage value obtained by dividing the voltage at the first end of the DCDC converter 10, and may be a voltage value according to the voltage output from the first end of the DCDC converter 10. That's fine. Therefore, the voltage value Vb may be, for example, the voltage value at the first end of the DCDC converter 10.

  The control unit 40 does not determine whether or not the voltage value Vic is less than the voltage threshold value, and detects opening of the second end of the DCDC converter 10 based on whether or not the difference value is greater than or equal to the difference threshold value. Also good. Even in this case, the control unit 40 can properly detect the opening of the second end of the DCDC converter 10.

Further, an analog circuit having the same function as that of the microcomputer 21 may be used instead of the microcomputer 21 configured using semiconductor elements.
Further, since each of the FETs 30, 31, 32, and 33 only needs to function as a switch, the FETs 30, 31, 32, and 33 are not limited to N-channel FETs, and may be P-channel FETs. Furthermore, bipolar transistors may be used instead of these for the FETs 30, 31, 32, and 33.
Further, the transformer circuit 20 is not limited to a circuit that performs transformation using four switches, as long as the voltage applied to the first end and the second end of the DCDC converter 10 can be transformed.

  The disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Power supply system 10 DCDC converter (transformer)
11 First capacitor (capacitor)
13 Generator 20 Transformer circuit 21 Microcomputer (control device)
22 current detection circuit 23 voltage detection circuit 40 control unit (circuit control unit, acquisition unit, calculation unit, difference determination unit, current determination unit)

Claims (10)

The voltage applied to the first end is transformed, the operation of the transformer circuit that outputs the transformed voltage from the second end is controlled and stopped, and the current value flowing from the second end is set to a predetermined value. In a control device including a circuit control unit that controls a voltage value output by a transformer circuit,
An acquisition unit for acquiring a voltage value corresponding to a voltage output from the second end;
The value related to the first voltage value acquired by the acquisition unit while the circuit control unit stops the operation of the transformer circuit, and the acquisition unit after the circuit control unit operates the transformer circuit A calculation unit for calculating a difference value between the values related to the acquired second voltage value;
And a difference determination unit that determines whether or not the difference value calculated by the calculation unit is equal to or greater than a difference threshold. The acquisition unit acquires the second voltage value after a time necessary for the current value to reach the predetermined value after the circuit control unit operates the transformer circuit. The control device according to claim 1. 3. The control device according to claim 1, wherein a value related to the second voltage value is based on a plurality of the second voltage values acquired by the acquisition unit during a predetermined period. The control device according to claim 3, wherein the value related to the second voltage value is an average value of the second voltage values. 5. The control device according to claim 1, wherein the value relating to the first voltage value is an average value of the first voltage values. 6. The transformer circuit transforms the output voltage of the generator applied to the first end, and outputs the transformed voltage from the second end to the capacitor,
The control device according to any one of claims 1 to 5, wherein a current flowing from the second end to the battery is a charging current. A current determination unit for determining whether the current value is less than a current threshold;
The circuit control unit, when the difference determination unit determines that the difference value is greater than or equal to the difference threshold value, and the current determination unit determines that the current value is less than the current threshold value, The control device according to any one of claims 1 to 6, wherein the operation of the transformer circuit is stopped. The circuit control unit stops the operation of the transformer circuit when the difference determination unit determines that the difference value is equal to or greater than the difference threshold value. The control apparatus as described in any one. A control device according to any one of claims 1 to 8,
The transformer circuit;
A current detection circuit for detecting a value related to the current value;
And a voltage detection circuit for detecting the voltage value. A transformer device according to claim 9;
And a capacitor to which the voltage output from the transformer circuit is applied.

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