JP2014217084A - Power supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply unit capable of quickly charging a storage element by running a large amount of charging current through the storage element from a generator.SOLUTION: In a power supply unit 1, one end of each of electric wires 11, 12 is connected with an output end of a generator 10. The other end of the electric wire 11 is connected with one end of a storage element 13, and the other end of the electric wire 12 is connected with a DC-DC converter 14. One end of the generator different from the output end and a negative terminal of the storage element 13 are grounded. The storage element 13 stores electric power output by the generator 10, and the DC-DC converter 14 selectively changes an output voltage of the generator 10 or the storage element 13.

Description

  The present invention relates to a power supply device that transforms an output voltage of a generator and applies power to the load by applying the transformed voltage to the load.

  A current vehicle is equipped with a power supply device that generates regenerative power in a generator by converting kinetic energy of the vehicle into electric power when the vehicle decelerates and supplies the generated regenerative power to a load ( For example, see Patent Document 1).

  FIG. 7 is a layout diagram of a conventional power supply apparatus, and FIG. 8 is a block diagram showing a configuration of the conventional power supply apparatus. In the conventional power supply device 5, the output end of the generator 100 is connected to one end of the electric wire 101, and the other end of the electric wire 101 is connected to the positive electrode terminal of the power storage element 103. One end of the electric wire 102 is connected to the positive electrode terminal of the electric storage element 103, and the other end of the electric wire 102 is connected to one end of the DC / DC converter 104. The other end of the DC / DC converter 104 is connected to the positive terminal of the power storage element 105 and the power supply box 106. The power supply box 106 is connected to the loads 107 and 108 separately. The generator 100, the power storage elements 103 and 105, and the loads 107 and 108 are grounded.

  The conventional power supply device 5 is mounted on a vehicle, and the generator 100 generates regenerative power by converting the kinetic energy of the vehicle into electric power when the vehicle decelerates. The power generator 100 supplies power to the power storage element 103 via the electric wire 101. The output voltage of the generator 100 is applied to one end of the DC / DC converter 104 via the electric wires 101 and 102. The DC / DC converter 104 transforms the voltage applied to one end, and applies the transformed voltage to the positive terminal of the power storage element 105 and also to the power supply box 106. The power supply box 106 applies the voltage applied to the DC / DC converter 104 to the loads 107 and 108, and the loads 107 and 108 are supplied with power.

  As described above, when the vehicle is decelerated, the electric power converted by the generator 100 from the kinetic energy of the vehicle is stored in the power storage element 103 and used to supply power to the loads 107 and 108. For this reason, the kinetic energy of the vehicle is efficiently used without being consumed by friction between the tire and the ground.

JP 2012-240487 A

However, in the conventional power supply device 5, both the current flowing from the generator 100 to the power storage element 103 and the current flowing from the generator 100 to the DC / DC converter 104 flow through the electric wire 101. The value I1 of the current flowing to the storage element 103 is the value I2 of the current flowing to the DC / DC converter 104, the output voltage value V1 of the generator 100, the open circuit voltage value V2 of the storage element 103, and the resistance value r1 of the electric wire 101. And using the internal resistance value r2 of the electricity storage element 103, the following equation is obtained.
I1 = (V1−V2−r1 × I2) / (r1 + r2)

  From this equation, when the current flows from the generator 100 to the DC / DC converter 104 via the electric wires 101 and 102, the value I1 of the current flowing into the power storage element 103 decreases by (r1 / (r1 + r2)) × I2. I understand that. For this reason, the conventional power supply device 5 has a problem that the current flowing into the power storage element 103 is small and the speed of charging the power storage element 103 is low.

  The period in which the generator 100 generates regenerative power is short because the vehicle is decelerating. Therefore, in order to efficiently use the regenerative power, it is very important to charge the power storage element 103 quickly.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply device that can flow a large amount of charging current from a generator to a storage element and can quickly charge the storage element. It is to provide.

  The power supply device according to the present invention includes a power generator, a power storage element that stores the power output by the power generator, and a transformer that selectively transforms the output voltage of the power generator or the power storage element. One end of the two electric wires is connected to one end of the power storage element, and the other end of the two electric wires is the other end of the two electric wires. It is connected to the transformer.

  In the present invention, the output end of the generator is connected to one end of each of the two electric wires, the other end of one of the two electric wires is connected to one end of the storage element, and the other of the two electric wires is the other. The end is connected to the transformer. The power output from the generator is supplied to the storage element via one of the two electric wires, and the storage element stores the power output from the generator. The output voltage of the generator is applied to the transformer unit through the other of the two electric wires. Further, the output voltage of the power storage element is applied to the transformer part via each of the two electric wires. The transformer unit selectively transforms the output voltage of the generator or the storage element, for example, according to the magnitude of the output voltage of each of the generator and the storage element, and applies the transformed voltage to, for example, a load.

  Since there is no common part between the path of the charging current flowing from the generator to the storage element and the path of the current flowing from the generator to the transformer, the value of the charging current flowing from the generator to the storage element is Is independent of the value of the current flowing into Therefore, even when the generator outputs power and current flows from the generator to the transformer, the charging current does not decrease, and a large amount of charging current flows from the generator to the storage element. Is charged quickly.

  A power supply device according to the present invention includes a generator, a power storage element that stores power output from the power generator, and a transformer that selectively transforms an output voltage of the power generator or the power storage element. Comprises an electric wire connected to the output end of the generator, and two electric wires each having one end connected to the other end of the electric wire, and the other end of the two electric wires is one end of the electric storage element. The other end of the other of the two electric wires is connected to the transformer unit.

  In the present invention, the output end of the generator is connected to one end of the electric wire, and the other end of the electric wire is connected to one end of each of the two electric wires. The other end of one of the two electric wires is connected to one end of the electric storage element, and the other end of the electric wire of the other of the two electric wires is connected to the transformer. The electric power output from the generator is supplied to the electric storage element through one end of the electric wire connected to the output end of the generator and one of the two electric wires, and the electric storage element stores the electric power generated by the generator. The output voltage of the generator is applied to the transformer through one of the wires connected to the output end of the generator and the other of the two wires. Further, the output voltage of the power storage element is applied to the transformer part via each of the two electric wires. The transformer unit selectively transforms the output voltage of the generator or the storage element, for example, according to the magnitude of the output voltage of each of the generator and the storage element, and applies the transformed voltage to, for example, a load.

  The amount of decrease in charging current that is reduced by the current flowing from the generator to the transformer section because the path of the charging current that flows from the generator to the storage element and the path of the current that flows from the generator to the transformer section are short. There are few. Therefore, when the generator outputs power, a large amount of charging current flows from the generator to the storage element, and the storage element is quickly charged.

  The power supply device according to the present invention includes: a second power storage element that stores electricity by applying a voltage transformed by the transformer; and a voltage that is transformed by the transformer, or an application of an output voltage of the second electricity storage element. And a load to be provided.

  In the present invention, the transformer unit applies the transformed voltage to the second power storage element, and the second power storage element stores power. The voltage transformed by the transformer or the output voltage of the second power storage element is applied to the load, and the load is fed. Thereby, a stable voltage is applied to the load, and the load operates appropriately.

  The power supply device according to the present invention includes a second power storage element that stores electricity by application of a voltage transformed by the transformer, and a load that is fed by application of voltage, and the transformer further includes the second storage device. The output voltage of the power storage element is transformed, and the voltage obtained by the transformation of the output voltage is applied to the load.

In the present invention, the transformer unit applies the voltage obtained by transforming the output voltage of the generator to the second power storage element, and the second power storage element stores the power.
By performing the transformation, the transformer can apply a constant voltage to the second power storage element regardless of the output voltage of each of the generator and the power storage element, and keep a constant current flowing through the second power storage element. Thus, the second power storage element can be quickly charged.

  The transformer also transforms the output voltage of the second storage element in addition to the output voltage of the generator. The voltage transformer applies a voltage obtained by voltage transformation of the output voltage of the second power storage element to the load, and the load is fed. Thereby, the electric power stored in the second power storage element is supplied to the load.

  According to the present invention, a large amount of charging current can flow from the generator to the storage element, and the storage element can be charged quickly.

2 is a layout diagram of a power supply device according to Embodiment 1. 3 is a block diagram illustrating a configuration of a power supply device according to Embodiment 1. FIG. FIG. 6 is a block diagram illustrating a configuration of a power supply device according to a second embodiment. FIG. 10 is a layout diagram of a power supply device according to a third embodiment. FIG. 10 is a block diagram illustrating a configuration of a power supply device according to a third embodiment. FIG. 10 is a block diagram illustrating a configuration of a power supply device according to a fourth embodiment. It is a layout view of a conventional power supply device. It is a block diagram which shows the structure of the conventional power supply device.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a layout diagram of a power supply device according to the first embodiment, and FIG. 2 is a block diagram showing a configuration of the power supply device. The power supply device 1 shown in FIGS. 1 and 2 is preferably mounted on a vehicle, and includes a generator 10, electric wires 11 and 12, power storage elements 13 and 15, a DC / DC converter 14, a power supply box 16, and loads 17 and 18. Prepare. The power supply box 16 has three connection ends.

  The generator 10 is disposed on the right front side in the vehicle, and the output end of the generator 10 is connected to one end of each of the electric wires 11 and 12. The other end of the electric wire 11 is connected to the positive electrode terminal of the electricity storage element 13, and the electricity storage element 13 is arranged at the front center in the vehicle. The other end of the electric wire 12 is connected to one end of the DC / DC converter 14.

  The other end of the DC / DC converter 14 is connected to the positive terminal of the power storage element 15 and the first connection end of the power supply box 16. One ends of loads 17 and 18 are connected to the second and third connection ends of the power supply box 16, respectively. One end of the generator 10 different from the output end, the negative terminals of the storage elements 13 and 15, and the other ends of the loads 17 and 18 are grounded.

  The generator 10 generates electric power in conjunction with an unillustrated engine of a vehicle on which the power supply device 1 is mounted, and generates regenerative electric power by converting the kinetic energy of the vehicle into electric power when the vehicle decelerates. . Specifically, the generator 10 generates AC power both when generating power in conjunction with the engine and when generating regenerative power, and rectifies the generated AC power into DC power. The power, voltage, and current output from the output terminal of the generator 10 are rectified DC power, DC voltage, and DC current, respectively.

  The storage element 13 is an electric double layer capacitor or a lithium ion battery. The output voltage of the generator 10 is applied to the positive electrode terminal of the power storage element 13 via the electric wire 11, and the power storage element 13 stores the power output from the power generator 10.

  When the output voltage of the generator 10 is sufficiently higher than the output voltage of the storage element 13, the output voltage of the generator 10 is applied to one end of the DC / DC converter 14 via the electric wire 12. Further, when the output voltage of the generator 10 is sufficiently lower than the output voltage of the power storage element 13 due to, for example, the engine being stopped, the output voltage of the power storage element 13 is connected to one end of the DC / DC converter 14 via the electric wires 11 and 12. To be applied.

  The DC / DC converter 14 transforms the output voltage of the generator 10 when the output voltage of the generator 10 is applied to one end, and the output of the storage element 13 when the output voltage of the storage element 13 is applied to one end. Transform voltage. In this way, the DC / DC converter 14 selectively transforms the output voltage of the generator 10 or the storage element 13. The DC / DC converter 14 transforms the voltage applied to one end to a constant voltage by stepping up or down the voltage applied to one end. The DC / DC converter 14 applies a constant voltage obtained by voltage transformation from the other end to the positive terminal of the power storage element 15 and the first connection end of the power supply box 16. The DC / DC converter 14 functions as a transformer.

  The power storage element 15 is, for example, a lead battery. A voltage transformed by the DC / DC converter 14 is applied to the storage element 15, and the storage element 15 stores electricity by application of the voltage transformed by the DC / DC converter 14. The power storage element 15 functions as a second power storage element. For example, the power storage element 15 supplies power to a starter (not shown) for starting the engine. When starting the engine, the DC / DC converter 14 stops the transformation, and the starter operates using the electric power supplied from the power storage element 15.

  While the DC / DC converter 14 is transforming the voltage applied to one end, the voltage transformed by the DC / DC converter 14 is applied to the first connection end of the power supply box 16. Further, while the DC / DC converter 14 stops the voltage transformation, the output voltage of the power storage element 15 is applied to the first connection end of the power supply box 16.

  The power supply box 16 applies the voltage applied to the first connection end from the second connection end to one end of the load 17 and applies the voltage from the third connection end to one end of the load 18. As a result, the voltage transformed by the DC / DC converter 14 or the output voltage of the storage element 15 is applied to each of the loads 17 and 18.

  Each of the loads 17 and 18 is an electric device mounted on the vehicle and is supplied with power by applying a voltage transformed by the DC / DC converter 14 or an output voltage of the storage element 15. Thereby, a stable voltage is applied to each of the loads 17 and 18, and each of the loads 17 and 18 operates appropriately.

  In the power supply device 1 configured as described above, a current flows from the generator 10 to the storage element 13 via the electric wire 11, and a current flows from the generator 10 to the DC / DC converter 14 via the electric wire 12. Therefore, there is no shared portion between the path of the current flowing from the generator 10 to the storage element 13 and the path of the current flowing from the generator 10 to the DC / DC converter 14.

For this reason, the value Ic of the charging current flowing from the generator 10 into the power storage element 13 includes the output voltage value Vg of the power generator 10, the open circuit voltage value Vs of the power storage element 13, the resistance value R11 of the electric wire 11, and It is determined by the internal resistance value Ri. Specifically, the charging current value Ic is expressed as follows. The open circuit voltage value Vs is a voltage value of the positive electrode terminal when the positive electrode terminal of the electricity storage element 13 is opened.
Ic = (Vg−Vs) / (R11 + Ri)

  The charging current value Ic is independent of the value of the current flowing from the generator 10 to the DC / DC converter 14. Therefore, in the power supply device 1, even when the generator 10 outputs electric power, particularly regenerative power, and current flows from the generator 10 to the DC / DC converter 14, charging that flows from the generator 10 to the storage element 13 is performed. The current does not decrease, and a large amount of charging current flows from the generator 10 to the power storage element 13 so that the power storage element 13 is quickly charged.

(Embodiment 2)
FIG. 3 is a block diagram showing the configuration of the power supply apparatus according to the second embodiment. The power supply device 2 in the second embodiment is different from the power supply device 1 in the first embodiment in the wiring between the output end of the generator 10, the positive terminal of the storage element 13, and one end of the DC / DC converter 14.

  Below, the power supply device 2 according to the second embodiment will be described while referring to differences from the power supply device 1 according to the first embodiment. The same reference numerals are given to the configurations of the second embodiment common to the first embodiment, and detailed description thereof will be omitted.

  The power supply device 2 is preferably mounted on a vehicle. The power supply device 2 includes a generator 10, power storage elements 13 and 15, a DC / DC converter 14, a power supply box 16, and loads 17 and 18, similarly to the power supply device 1 in the first embodiment. The power supply device 2 further includes electric wires 20, 21, and 22 instead of the electric wires 11 and 12. In the power supply device 3, other connections than the connection between the output end of the generator 10, the positive terminal of the storage element 13 and one end of the DC / DC converter 14 are the same as those of the power supply device 1 in the first embodiment.

  One end of the electric wire 20 is connected to the output end of the generator 10, and one end of each of the electric wires 21 and 22 is connected to the other end of the electric wire 20. The other end of the electric wire 21 is connected to the positive terminal of the power storage element 13, and the other end of the electric wire 22 is connected to one end of the DC / DC converter 14.

  The generator 10 generates electric power as in the first embodiment. The output voltage of the generator 10 is applied to the positive electrode terminal of the power storage element 13 via the electric wires 20 and 21, and the power storage element 13 stores the power output from the power generator 10 as in the first embodiment.

  When the output voltage of the generator 10 is sufficiently higher than the output voltage of the storage element 13, the output voltage of the generator 10 is applied to one end of the DC / DC converter 14 via the electric wires 20 and 22. Further, when the output voltage of the generator 10 is sufficiently lower than the output voltage of the storage element 13, the output voltage of the storage element 13 is applied to one end of the DC / DC converter 14 via the electric wires 21 and 22.

  DC / DC converter 14, power storage element 15, power supply box 16 and loads 17 and 18 operate in the same manner as in the first embodiment, and each of DC / DC converter 14 and power storage element 15 functions as a transformer and a second power storage element. To do.

Therefore, the DC / DC converter 14 selectively transforms the output voltage of the generator 10 or the storage element 13. The power storage element 15 stores power by applying a voltage transformed by the DC / DC converter 14. Each of the loads 17 and 18 is supplied with power by applying a voltage transformed by the DC / DC converter 14 or an output voltage of the storage element 15.
Thereby, a stable voltage is applied to each of the loads 17 and 18, and each of the loads 17 and 18 operates appropriately.

  Next, the value Ic of the charging current flowing from the generator 10 to the storage element 13 when the generator 10 outputs power is obtained. Here, as in the first embodiment, the output voltage value of the generator 10 is Vg, the open-circuit voltage value of the power storage element 13 is Vs, and the internal resistance value of the power storage element 13 is Ri. Furthermore, the resistance value of the electric wire 20 is R20, and the resistance value of the electric wire 21 is R21. In addition, the value of the current flowing out from the output end of the generator 10 is denoted as Ig, and the value of the current flowing into one end of the DC / DC converter 14 is denoted as Id.

First, the following equations (1) and (2) are established by Ohm's law and Kirchhoff's law.
Vg−Vs = R20 × Ig + (R21 + Ri) × Ic (1)
Ig = Ic + Id (2)

By substituting Equation (2) into Equation (1) and erasing Ig, the charging current value Ic is calculated as follows.
Ic = ((Vg−Vs) / (R20 + R21 + Ri))
− (R20 / (R20 + R21 + Ri)) × Id (3)

  Next, for comparison, in the power supply device 2, instead of the electric wires 20, 21, and 22, an electric wire having a resistance value of (R20 + R21) is used, and the output terminal of the generator 10 and the positive electrode terminal of the storage element 13 are Then, the charging current value Ic1 in the conventional power supply device to which one end of the DC / DC converter 14 is connected is calculated. In the conventional power supply device, one end of the electric wire having a resistance value of (R20 + R21) is connected to the output end of the generator 10, and the other end of the electric wire having a resistance value of (R20 + R21) is connected to the positive electrode terminal of the power storage element 13. It is connected to one end of the DC / DC converter 14.

  In the conventional power supply device, the value of the current flowing from the output end of the generator 10 is Ig1, and the value of the current flowing from the other end of the electric wire whose resistance is (R20 + R21) to one end of the DC / DC converter 14 is Id1. .

The following equations (4) and (5) are established by Ohm's law and Kirchhoff's law.
Vg−Vs = (R20 + R21) × Ig1 + Ri × Ic1 (4)
Ig1 = Ic1 + Id1 (5)

By substituting the equation (5) into the equation (4) and erasing Ig1, the charging current value Ic1 is calculated as follows.
Ic1 = ((Vg−Vs) / (R20 + R21 + Ri))
− ((R20 + R21) / (R20 + R21 + Ri)) × Id1 (6)

When the value of the current flowing through one end of the DC / DC converter 14 is the same in the power supply device 2 and the conventional power supply device, that is, Id = Id1, the difference Ic−Ic1 between the charging current values is expressed by Equations (3) and (6). It is calculated as follows using the formula.
Ic−Ic1 = (R21 / (R20 + R21 + Ri)) × Id ·· (7)

  Since (R21 / (R20 + R21 + Ri)) × Id is a positive value, Ic> Ic1 holds. Therefore, in the power supply device 2, compared with the conventional power supply device, the reduction amount of the charging current that is reduced when the same amount of current flows from the generator 10 to the DC / DC converter 14 is (R21 / (R20 + R21 + Ri)). × Id less.

  As described above, in the power supply device 2, the portion of the charging current that flows from the generator 10 to the storage element 13 and the path of the current that flows from the generator 10 to the DC / DC converter 14 are short. The amount of decrease in the charging current that is reduced by the current flowing from 10 to the DC / DC converter 14 is small. Therefore, when the generator 10 outputs electric power, a large amount of charging current flows from the generator 10 to the power storage element 13, and the power storage element is quickly charged.

(Embodiment 3)
FIG. 4 is a layout diagram of the power supply device according to the third embodiment, and FIG. 5 is a block diagram showing the configuration of the power supply device. The power supply device 3 in the third embodiment is different from the power supply device 1 in the first embodiment in the connection position of the first connection end of the power supply box 16 and the configuration for supplying power to the loads 17 and 18.

  Hereinafter, the power supply device 3 according to the third embodiment will be described while referring to differences from the power supply device 1 according to the first embodiment. The same reference numerals are given to the configurations of the third embodiment common to the first and second embodiments, and detailed description thereof will be omitted.

  Similarly to power supply device 1 in the first embodiment, power supply device 3 is preferably mounted on a vehicle, and includes generator 10, electric wires 11, 12, power storage elements 13, 15, DC / DC converter 14, power supply box 16, and load. 17 and 18 are provided. As shown in FIG. 4, the generator 10 is disposed on the front right side in the vehicle, and the power storage element 13 is disposed on the front left side in the vehicle.

  The generator 10, the electric wires 11 and 12, the storage element 13, the DC / DC converter 14, and the storage element 15 are connected in the same manner as in the first embodiment. Therefore, the output end of the generator 10 is connected to one end of each of the electric wires 11 and 12, the other end of the electric wire 11 is connected to the positive terminal of the power storage element 13, and the other end of the electric wire 12 is connected to one end of the DC / DC converter 14. Connected.

  The power supply box 16 has three connection ends as in the first embodiment. The first connection end of the power supply box 16 is connected to a connection node between the electric wire 12 and the DC / DC converter 14, and the second and third connection ends of the power supply box 16 are connected to one ends of the loads 17 and 18, respectively. Yes. The other ends of the loads 17 and 18 are grounded.

  The generator 10 and the storage element 13 operate in the same manner as in the first embodiment. Therefore, the storage element 13 stores the power output from the generator 10. Power storage element 13 in the third embodiment is, for example, a lead battery.

  Similarly to the first embodiment, when the output voltage of the generator 10 is sufficiently higher than the output voltage of the storage element 13, the output voltage of the generator 10 is applied to one end of the DC / DC converter 14 via the electric wire 12. Applied. When the output voltage of the generator 10 is sufficiently lower than the output voltage of the storage element 13, the output voltage of the storage element 13 is applied to one end of the DC / DC converter 14 via the electric wires 11 and 12.

  The DC / DC converter 14 transforms the output voltage of the generator 10 when the output voltage of the generator 10 is applied to one end, and the output of the storage element 13 when the output voltage of the storage element 13 is applied to one end. Transform voltage. In this way, the DC / DC converter 14 selectively transforms the output voltage of the generator 10 or the storage element 13. The DC / DC converter 14 transforms the voltage applied to one end to a constant voltage by stepping up or down the voltage applied to one end. The DC / DC converter 14 applies a constant voltage obtained by voltage transformation to the positive terminal of the power storage element 15 from the other end.

  The power storage element 15 in the third embodiment is an electric double layer capacitor, a lithium ion battery, or the like, and stores power by applying a constant voltage obtained by transforming the voltage applied to one end by the DC / DC converter 14. . Power storage element 15 functions as a second power storage element as in the first embodiment. The output voltage of the storage element 15 is applied to the other end of the DC / DC converter 14.

  The DC / DC converter 14 transforms the output voltage of the power storage element 15 applied to the other end, and applies the voltage obtained by the transformation of the output voltage of the power storage element 15 to the first connection end of the power supply box 16. The power supply box 16 applies the voltage applied to the first connection end from the second connection end to one end of the load 17 and applies the voltage from the third connection end to one end of the load 18. Thereby, the voltage obtained by the DC / DC converter 14 by the transformation of the output voltage of the storage element 15 is applied to each of the loads 17 and 18. Each of the loads 17 and 18 is supplied with power by applying a voltage obtained by the DC / DC converter 14 by transformation of the output voltage of the storage element 15. The DC / DC converter 14 functions as a transformer.

  The DC / DC converter 14 includes a transformer of the output voltage of the generator 10 or the storage element 13 applied to one end of the DC / DC converter 14 and an output of the storage element 15 applied to the other end of the DC / DC converter 14. An instruction signal for instructing one of the voltage transformation is input. The DC / DC converter 14 switches the transformation direction according to the instruction of the input instruction signal.

  For example, the DC / DC converter 14 transforms the output voltage of the generator 10 or the storage element 13 applied to one end during a period in which the vehicle decelerates and the generator 10 outputs regenerative power according to the instruction of the instruction signal. And you may comprise so that the output voltage of the electrical storage element 15 applied to the other end may be transformed during the period when the generator 10 is not outputting regenerative electric power.

  In the power supply device 3 configured as described above, when the storage element 15 is charged, the DC / DC converter 14 adjusts the step-up width or the step-down width to adjust the output voltage of the generator 10 or the storage element 13. Regardless, a constant voltage can be applied to the positive terminal of the electricity storage element 15. For this reason, it is possible to keep a constant current flowing through the power storage element 15 and to quickly charge the power storage element 15.

  Further, in the power supply device 3, a current flows from the generator 10 to the storage element 13 via the electric wire 11, and a current flows from the generator 10 to the DC / DC converter 14 and the power supply box 16 via the electric wire 12. Therefore, there is no part in which the path of the current flowing from the generator 10 to the storage element 13 and the path of the current flowing from the generator 10 to the DC / DC converter 14 and the power supply box 16 are shared.

As in the first embodiment, the charging current value Ic flowing from the generator 10 to the storage element 13 is the output voltage value Vg of the generator 10, the open circuit voltage value Vs of the storage element 13, the resistance value R11 of the electric wire 11, and , And is determined by the internal resistance value Ri of the storage element 13. Specifically, the charging current value Ic is expressed as follows.
Ic = (Vg−Vs) / (R11 + Ri)

  The charging current value Ic is independent of the value of the current flowing from the generator 10 to the DC / DC converter 14. Therefore, in the power supply device 1, even when the generator 10 outputs electric power and current flows from the generator 10 to the DC / DC converter 14 and the power supply box 16, charging that flows from the generator 10 to the storage element 13 is performed. The current does not decrease, and a large amount of charging current flows from the generator 10 to the power storage element 13 so that the power storage element 13 is quickly charged.

(Embodiment 4)
FIG. 6 is a block diagram showing a configuration of power supply device 4 according to the fourth embodiment. The power supply device 4 in the fourth embodiment is different from the power supply device 2 in the second embodiment in the connection position of the first connection end of the power supply box 16 and the configuration for supplying power to the loads 17 and 18.

  Hereinafter, the power supply device 4 according to the fourth embodiment will be described while referring to differences from the power supply device 2 according to the second embodiment. The configuration of the fourth embodiment that is common to any one of the first to third embodiments is denoted by the same reference numeral, and detailed description thereof is omitted.

  Similarly to power supply device 2 in the second embodiment, power supply device 4 is preferably mounted on a vehicle, and includes generator 10, power storage elements 13 and 15, DC / DC converter 14, power supply box 16, loads 17 and 18, and electric wires. 20, 21, 22 are provided.

  The generator 10, the storage element 13, the DC / DC converter 14, the storage element 15, and the electric wires 20, 21, and 22 are connected in the same manner as in the second embodiment. Accordingly, one end of the electric wire 20 is connected to the output end of the generator 10, and one end of each of the electric wires 21 and 22 is connected to the other end of the electric wire 20. The other end of the electric wire 21 is connected to the positive terminal of the power storage element 13, and the other end of the electric wire 22 is connected to one end of the DC / DC converter 14.

  The power supply box 16 has three connection ends as in the second embodiment. The first connection end of the power supply box 16 is connected to a connection node between the electric wire 22 and the DC / DC converter 14, and the second and third connection ends of the power supply box 16 are connected to one ends of the loads 17 and 18, respectively. Yes. The other ends of the loads 17 and 18 are grounded.

  The generator 10 and the storage element 13 operate in the same manner as in the second embodiment. Therefore, the storage element 13 stores the power output from the generator 10. Storage element 13 in the fourth embodiment is, for example, a lead battery.

  When the output voltage of the generator 10 is sufficiently higher than the output voltage of the storage element 13, the output voltage of the generator 10 is connected to one end of the DC / DC converter 14 and the first power supply box 16 via the wires 20 and 22. Applied to one connection end. When the output voltage of the generator 10 is sufficiently lower than the output voltage of the storage element 13, the output voltage of the storage element 13 is connected to one end of the DC / DC converter 14 and the power supply box 16 via the wires 21 and 22. Is applied to the first connection end of the.

  The DC / DC converter 14, the storage element 15, the power supply box 16, and the loads 17, 18 in the fourth embodiment are the same as the DC / DC converter 14, the storage element 15, the power supply box 16, and the loads 17, 18 in the third embodiment. Acts similarly.

  Therefore, the DC / DC converter 14 functions as a transformer, and selectively transforms the output voltage of the generator 10 or the storage element 13. Further, the DC / DC converter 14 transforms the output voltage of the power storage element 15 applied to the other end, and applies the voltage obtained by the transformation of the output voltage of the power storage element 15 to the first connection end of the power supply box 16. . The DC / DC converter 14 switches the transformation direction according to the input instruction signal.

  The power storage element 15 is an electric double layer capacitor, a lithium ion battery, or the like, and functions as a second power storage element. The power storage element 15 stores power by applying a constant voltage obtained by transforming the voltage applied to one end by the DC / DC converter 14. A voltage obtained by the DC / DC converter 14 by the transformation of the output voltage of the storage element 15 is applied to each of the loads 17 and 18. Each of the loads 17 and 18 is supplied with power by applying a voltage obtained by the DC / DC converter 14 by transformation of the output voltage of the storage element 15.

  In the power supply device 4 configured as described above, when charging the power storage element 15, as in the third embodiment, the DC / DC converter 14 adjusts the step-up width or the step-down width, thereby generating the generator 10. Alternatively, a constant voltage can be applied to the positive electrode terminal of the storage element 15 regardless of the output voltage of the storage element 13. For this reason, it is possible to keep a constant current flowing through the power storage element 15 and to quickly charge the power storage element 15.

  In power supply device 4, when Id in the second embodiment is replaced with the total value of current flowing into one end of DC / DC converter 14 and the first connection end of power supply box 16, the value of charging current flowing into power storage element 13 The same operation as that of the second embodiment can be described for Ic.

  At this time, the conventional power supply device to be compared is a power supply device in which a wire having a resistance value of (R20 + R21) is used instead of the wires 20, 21, 22 in the power supply device 4. In the conventional power supply device according to the fourth embodiment, one end of the electric wire having a resistance value of (R20 + R21) is connected to the output end of the generator 10, and the other end of the electric wire having a resistance value of (R20 + R21) is the electric storage element 13. The positive terminal is connected to one end of the DC / DC converter 14 and the first connection end of the power supply box 16. In the fourth embodiment, Id1 in the second embodiment is replaced with the total value of the current flowing into one end of the DC converter 14 and the first connection end of the power supply box 16.

  In the power supply device 4, the portion of the charging current that flows from the generator 10 to the storage element 13 and the path of the current that flows from the generator 10 to the DC / DC converter 14 and the power supply box 16 are short. For this reason, even in the power supply device 4, the amount of decrease in the charging current that is reduced when current flows from the generator 10 to the DC / DC converter 14 and the power supply box 16 is small. Thereby, when the generator 10 outputs electric power, a large amount of charging current flows from the generator 10 to the power storage element 13, and the power storage element is quickly charged.

  In the first to fourth embodiments, the number of loads connected to the power supply box 16 is not limited to two, and may be one or three or more. Further, the voltage obtained by the DC / DC converter 14 by voltage transformation may not be a constant voltage.

  The disclosed first to fourth embodiments should be considered as illustrative in all points 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, 2, 3, 4 Power supply device 10 Generator 11, 12, 20, 21, 22, Electric wire 13, 15 Storage element 14 DC / DC converter 17, 18 Load

Claims (4)

In a power supply device comprising a generator, a power storage element that stores the power output by the power generator, and a transformer that selectively transforms the output voltage of the power generator or the power storage element,
Each end comprises two wires connected to the output end of the generator,
The other end of one of the two electric wires is connected to one end of the power storage element,
The other end of the other of the two electric wires is connected to the transformer unit. In a power supply device comprising a generator, a power storage element that stores the power output by the power generator, and a transformer that selectively transforms the output voltage of the power generator or the power storage element,
An electric wire having one end connected to the output end of the generator;
Two electric wires each having one end connected to the other end of the electric wire,
The other end of one of the two electric wires is connected to one end of the power storage element,
The other end of the other of the two electric wires is connected to the transformer unit. A second power storage element that stores power by application of a voltage transformed by the transformer;
The power supply apparatus according to claim 1, further comprising: a voltage that is transformed by the transformer, or a load that is fed by application of an output voltage of the second power storage element. A second power storage element that stores power by application of a voltage transformed by the transformer;
A load that is powered by the application of voltage,
The transformer is further configured to transform an output voltage of the second power storage element and apply a voltage obtained by transforming the output voltage to the load. Or the power supply device of Claim 2.

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