JP3213784U - Voltage converter - Google Patents

Abstract

The present invention can be used when charging another battery having a large battery capacity by using electricity stored in the battery by solar power generation or the like, and is low in manufacturing cost and easy to install and carry. A voltage converter is provided. A voltage converter 1a according to the present invention is used when a second battery 11b is charged by using electricity of a first battery 11a stored by a solar power generation system 10. A DC motor 2 that uses the battery 11a as a power source, a three-phase AC generator 3 that is rotationally driven by the DC motor 2, and a rectifier 4a that converts AC output from the three-phase AC generator 3 into DC. ing. The casing 5 in which the DC motor 2, the three-phase AC generator 3, and the rectifier 4a are installed is provided with a handle 6 on the top surface and DC output terminals 7a and 7b and a ventilation window 8 on the front surface. The input terminal 9 is drawn out from the back. [Selection] Figure 1

Description

  The present invention relates to a voltage conversion device used when charging another battery by using electricity stored in a battery by photovoltaic power generation or the like. The present invention relates to a voltage converter that can be raised well.

In a solar power generation system used in a general household, a battery having a relatively small battery capacity is often used in order to temporarily store surplus power. As such a battery, for example, a lithium ion battery having a total storage amount of 120 Wh is known.
However, since the battery described above has a small battery capacity, there is a case where it is unavoidable that electricity that cannot be stored cannot be discarded.

  If another battery having a large battery capacity is charged using electricity stored in a battery having a small battery capacity, it is possible to avoid a situation in which excess electricity cannot be stored in a battery having a small battery capacity and the remaining electricity is discarded. However, for this purpose, it is necessary to increase the voltage of electricity stored in a battery having a small battery capacity.

In this regard, for example, Patent Document 1 discloses a device having a DC-AC inverter that converts a DC power source (DC 12 V) of a built-in battery into a home AC power source (AC 100 V) under the name of “portable power source device”. Has been.
AC power is output from the DC-AC inverter. If an AC-DC inverter (converter) is used, the AC power can be converted into DC power. Therefore, by combining the DC-AC inverter and the AC-DC inverter (converter), the voltage of the DC power source can be easily converted.

Registered Utility Model No. 3195927

  When the DC-AC inverter disclosed in Patent Document 1 is used in combination with an AC-DC inverter (converter) and the voltage of the DC power supply is changed, the current decreases in inverse proportion to the voltage. Therefore, in such a method, even if the voltage of electricity stored in a battery having a small battery capacity can be increased, it is difficult to charge another battery having a large battery capacity using the electricity. If a mechanism for changing the current is added, the apparatus becomes large, and it may be difficult to install and carry, and the manufacturing cost may increase.

  The present invention has been made in response to such a problem of the conventional technique, and when charging a battery having a large battery capacity by increasing the voltage of the direct current stored in the battery by solar power generation or the like. An object of the present invention is to provide a voltage conversion device that can be used for the above-mentioned purposes and that is inexpensive to manufacture and easy to install and carry.

  In order to achieve the above object, a first device is a rectifier having an AC input terminal and a DC output terminal, a three-phase AC generator having an AC output terminal connected to the AC input terminal of the rectifier, and the three-phase AC And a DC motor that rotationally drives the generator.

In the voltage conversion device having the above structure, when a direct current is supplied to the direct current motor, the direct current motor rotates the rotor of the three-phase alternating current generator at a speed proportional to the voltage of the direct current, and the three-phase alternating current generator is An alternating current having a voltage proportional to the rotational speed of the rotor is generated. The rectifier converts the alternating current supplied from the three-phase alternating current generator into a direct current.
Therefore, in the first device, the DC motor is operated using the first battery as a drive source in a state where the DC output terminal of the rectifier is connected to the input terminal of the second battery having a larger battery capacity than the first battery. In this case, a DC current having a voltage different from the DC current supplied from the first battery to the DC motor is supplied to the second voltage.
Further, since the first device does not use an inverter or a converter, the entire structure is simplified and the number of parts is reduced.

The second device is characterized in that, in the first device, the rectifier includes a full-wave rectifier circuit constituted by a bridge connection of six diodes.
In the voltage conversion device having such a structure, in addition to the operation of the first device, either the positive part or the negative part of the sine wave of the alternating current generated in the three-phase alternating current generator by the rectifier. By inverting one side to the other side, it has the effect of rectifying over the entire cycle.

A third device is characterized in that, in the first device, the rectifier includes a half-wave rectifier circuit configured such that three diodes are respectively connected in parallel to a pair of DC output terminals. It is what.
In the voltage conversion device having such a structure, in addition to the operation of the first device, either the positive part or the negative part of the sine wave of the alternating current generated in the three-phase alternating current generator by the rectifier. Only one side is taken out and the other side is prevented from being energized.

A fourth device is characterized in that in any one of the first device to the third device, a smoothing capacitor connected in parallel with the rectifier is provided.
In the voltage conversion device having such a structure, in addition to the operation of any one of the first to third devices, the smoothing capacitor discharges when the phase voltage decreases in the three-phase AC generator, It has the effect | action that the fall of the applied voltage with respect to the load connected to the DC output terminal is suppressed.

  As described above, according to the first device, the direct current supplied from the first battery is converted into a direct current having a higher voltage, thereby charging the second battery having a large battery capacity. Can be used. In addition, as a small and light structure, it is easy to install and carry, and the manufacturing cost can be reduced.

  Moreover, in the second device, in addition to the effect of the first device, the three-phase alternating current generated by the three-phase alternating current generator can be efficiently converted into a direct current.

  According to the third device, in addition to the effect of the first device, since the alternating current supplied from the three-phase AC generator passes through only one diode in the rectifier, the energy loss can be minimized. Play.

  According to the fourth device, in addition to the effect of any one of the first device to the third device, there is an effect that the fluctuation of the output voltage can be suppressed.

(A) is the block diagram which showed the structure of Example 1 of the voltage converter which concerns on embodiment of this invention, (b) is the perspective view which showed the external appearance of the voltage converter. (A) is the circuit diagram of the three-phase alternating current generator and rectifier in the voltage converter of Example 1, (b) is the graph which showed the time waveform of the phase voltage which generate | occur | produces in the armature coil of a three-phase alternating current generator. It is. (A) thru | or (c) are the graphs which showed the time waveform of the line voltage. (A) thru | or (c) is the figure which showed the path | route of the electric current which flows into the circuit of the voltage converter of Example 1. FIG. (A) thru | or (c) is the figure which showed the path | route of the electric current which flows into the circuit of the voltage converter of Example 1. FIG. (A) thru | or (c) are the graphs which showed the time waveform of the line voltage, (d) is the graph which showed the time waveform of the output voltage of the voltage converter of Example 1. FIG. It is a circuit diagram concerning the modification of the voltage converter of Example 1. (A) thru | or (c) are the figures which showed an example of the path | route of the electric current which flows through the circuit shown in FIG. It is the graph which showed the time waveform of the output voltage of the circuit shown in FIG. (A) is the circuit diagram of the three-phase alternating current generator and rectifier in Example 2 of the voltage converter which concerns on embodiment of this invention, (b) is the figure which showed the modification. (A) thru | or (c) is the figure which showed the path | route of the electric current which flows into the circuit of the voltage converter of Example 2. FIG. (A) is a graph showing a time waveform of the phase voltage _{v a, v b, v c} in the circuit of the voltage converter in Example 2, (b) and (c) are respectively views. 10 (a) and FIG. It is the graph which showed the time waveform of the output voltage of the circuit shown to 10 (b). It is a circuit diagram of the three-phase alternating current generator and rectifier in Example 3 of the voltage converter which concerns on embodiment of this invention.

The voltage converter of the present invention is a power device that converts a DC current supplied from a DC power source into a DC current having a higher voltage than that, and has a large battery capacity using electricity stored in a battery having a small battery capacity. It can be used when charging other batteries.
Hereinafter, the specific structure and the action and effect based thereon will be described with reference to FIGS.

  FIG. 1A is a block diagram showing an example of the configuration of the voltage converter according to the present invention, and FIG. 1B is a perspective view showing the appearance thereof. FIG. 2 (a) is a circuit diagram of the three-phase AC generator and rectifier shown in FIG. 1 (a), and FIG. 2 (b) is a diagram of the phase voltage generated in the armature coil of the three-phase AC generator. It is the graph which showed the time waveform. FIG. 3A to FIG. 3C are graphs showing the relationship between the phase voltage generated in the armature coil of the three-phase AC generator and the line voltage.

As shown in FIG. 1 (a), the voltage converter 1a of the present invention converts a direct current supplied from a first battery 11a stored by a solar power generation system 10 into a direct current having a higher voltage. Then, it can be used when supplying to the second battery 11b, the DC motor 2 using the first battery 11a as a power source, and the three-phase AC generator 3 that is rotationally driven by the DC motor 2, A rectifier 4a that converts alternating current output from the three-phase alternating current generator 3 into direct current is provided.
As shown in FIG. 1B, in the voltage conversion device 1a, a DC motor 2, a three-phase AC generator 3, and a rectifier 4a are installed inside a housing 5, and a handle is provided on the upper surface of the housing 5. 6 is attached. A pair of DC output terminals 7 a and 7 b and a ventilation window 8 of the rectifier 4 a are provided on the front surface of the housing 5, and an input terminal 9 is drawn from the back surface of the housing 5.

  The first battery 11a is a lithium ion battery having a battery capacity of 120 Wh, and the second battery 11b is a lithium ion battery having a battery capacity of 360 Wh. However, the type of battery and the battery capacity are not limited thereto. These can be changed as appropriate. However, the second battery 11b has a larger battery capacity than the first battery 11a.

As described above, in the voltage conversion device 1a, a DC current of a predetermined voltage is supplied from the first battery 11a to the DC motor 2 having a structure in which the rotation speed changes in proportion to the input voltage, and the DC motor The three-phase AC generator 3 is rotated by 2. In this case, since the rotational speed of the DC motor 2 does not change, the rotor of the three-phase AC generator 3 rotates at a constant speed.
The three-phase AC generator 3 is an abduction type permanent magnet generator in which the magnet rotor is disposed outside the stator core, and the stator core includes an armature core having a stator side magnetic pole facing the rotor side magnetic pole. And three-phase armature coils 3a to 3c (see FIG. 2A) wound around the armature core. The AC current generated in the armature coils 3a to 3c is rectified by the rectifier 4a and then supplied to the second battery 11b (see FIG. 1A).

The rectifier 4a has a structure in which three sets of diodes D ₁ and D ₂ and diodes D ₃ and D ₄ and diodes D ₅ and D ₆ connected in series are connected in parallel to the DC output terminals 7a and 7b, respectively. ing. Further, the armature coils 3a~3c has one end connected between the cathode of the diode _{D 1,} D 3, the anode and the diode _D 2 of _{D 5, D 4, D 6} , with the other end connected to each other , And are arranged so that voltages with phases shifted by 120 ° are generated.
That is, the rectifier 4a is a diode D ₁ is a structure with a full-wave rectifier circuit constituted by a bridge connection to D _6, the three-phase AC generator 3 is in its three AC input terminals (not shown) The three AC output terminals (not shown) are connected to each other.

Here, the electromotive force of the generator will be described.
First, the electromotive force e [V] generated in one conductor is represented by the amount of change per second of the magnetic flux Φ [Wb], as shown in Equation (1), from Faraday's law of electromagnetic induction. .

When the conductor crosses a magnetic field having a magnetic flux density B [T] at a right angle at a velocity v [m / s] and the length of the conductor is L [m], the area where the magnetic flux intersects the conductor is Lv [m]. ² ], and the amount of change per second of the magnetic flux Φ [wb] is BLv. Therefore, Formula (1) is represented by the following Formula (2).

  When the diameter of the rotor constituted by the conductor is D [m] and the rotation speed is n [rps], the speed v is πDn. Further, when the number of poles of the generator is p and the magnetic flux per pole is φ [Wb], the above magnetic flux density B is expressed by the following formula (3). Therefore, equation (2) can be rewritten as equation (4).

On the other hand, the electromotive force E [V] of the generator is expressed by the following formula (5), where Z is the total number of conductors and q is the number of magnetic flux parallel circuits. Therefore, equation (4) can be further rewritten as equation (6). The number q of the parallel circuits is the same as the number of poles p when the armature winding method is lap winding, and is 2 when the armature winding method is wave winding.
That is, the electromotive force E of the generator is proportional to the product of the total number of conductors Z, the magnetic flux φ per pole, and the rotation speed n when the armature winding method is lap winding, and the armature winding method is In the case of wave winding, it is further proportional to the number of poles p of the generator.

Next, a three-phase AC generator will be described.
A three-phase AC generator has three phases, a phase, b phase, and c phase, and the voltage of each phase is called a phase voltage. For example, in the circuit diagram of a three-phase AC generator 3 shown in FIG. 2 (a), the phase voltage _v a to v _c which voltage generated in the armature coil 3a~3c corresponds to a phase ~c phase. Then, in the a phase to the c phase, when the voltages (line voltages) between the respective phases are set to v _ab , v _bc , and v _ca , the phase of the phase voltage v _b as shown in FIG. It has been delayed 120 ° from the phase of the phase voltage v _a, since it is delayed 120 ° from the phase of the phase voltage v _c the phase of the phase voltage v _b, V ₀ the peak value of the phase _voltage, the angular velocity ω Assuming that [deg / s] and time is t [s], the phase voltages v _{a to} v _c are expressed as in equations (7) to (9). Further, the line voltages v _ab , v _bc , and v _ca are expressed as in equations (10) to (12). At this time, the line voltages v _ab , v _bc , and v _ca change with time as shown in FIGS. 3A to 3C.

4 (a) to 4 (c) and FIGS. 5 (a) to 5 (c) are diagrams showing paths of current flowing through the circuit of the voltage conversion device 1a. FIGS. 6A to 6C are graphs showing time waveforms of the line voltages v _ab , v _bc , and v _ca , and FIG. 6D is a time of the output voltage of the voltage converter 1a. It is the graph which showed the waveform. 4 (a) to 4 (c) and FIGS. 5 (a) to 5 (c) are the DC output terminals 7a and 7b in the circuit diagram of the voltage converter 1a shown in FIG. 2 (a). This corresponds to a diagram in which a load 12 is connected to the.
In the circuit of the voltage converter 1a (see FIG. 2A), the current flowing into the rectifier 4a from the phase with the highest phase voltage out of the phases a to c flows out to the phase with the lowest phase voltage. The current flows according to the magnitude of the phase voltages v _{a to} v _c as time passes as shown in FIGS. 4 (a) to 4 (c) and FIGS. 5 (a) to 5 (c). There are six types of modes (hereinafter referred to as Mode1 to Mode6).

(Mode 1)
Phase voltage v _a is the highest, if the phase voltage v _b is the lowest, as shown in FIG. 4 (a), after the current flowing into the rectifier 4a from a phase flowing to the load 12 through the diode D _1, It flows into rectifier 4a, returning to b-phase through the diode _{D 4.}
(Mode2)
Phase voltage v _a is the highest, if the phase voltage v _c is the lowest, as shown in FIG. 4 (b), after the current flowing into the rectifier 4a from a phase flowing to the load 12 through the diode D _1, It flows into rectifier 4a, return to c phase through the diode _{D 6.}
(Mode 3)
Phase voltage v _b is the highest, if the phase voltage v _c is the lowest, as shown in FIG. 4 (c), the current flowing into the rectifier 4a from b phase After flowing to the load 12 through the diode D _3, It flows into rectifier 4a, return to c phase through the diode _{D 6.}

(Mode 4)
Phase voltage v _b is the highest, if the phase voltage v _a is the lowest, as shown in FIG. 5 (a), the current flowing into the rectifier 4a from b phase After flowing to the load 12 through the diode D _3, It flows into rectifier 4a, returns to a phase through diode _{D 2.}
(Mode 5)
Phase voltage v _c is the highest, if the phase voltage v _a is the lowest, as shown in FIG. 5 (b), after the current flowing into the rectifier 4a from c phase flowing to the load 12 through the diode D _5, It flows into rectifier 4a, return to c phase through the diode _{D 2.}
(Mode 6)
When the phase voltage v _c is the highest and the phase voltage v _b is the lowest, as shown in FIG. 5C, the current flowing from the c phase into the rectifier 4a flows through the diode D ₅ to the load 12, It flows into rectifier 4a, returning to b-phase through the diode _{D 4.}

As apparent from FIGS. 4A to 4C and FIGS. 5A to 5C, in the circuit shown in FIG. 2A, the current is always in the same direction with respect to the load 12. Flowing into. That is, since the alternating current generated by the three-phase alternating current generator 3 is converted into a direct current (pulsating current) by the rectifier 4a, the line voltage v _ab , shown in FIGS. The time waveforms of v _bc and v _ca are actually expressed as shown in FIGS. 6 (a) to 6 (c).
In this case, the output voltage of the voltage conversion device 1a (the voltage between the DC output terminals 7a and 7b in FIG. 2A) is the above-described line in each Mode as shown by the thick black line in FIG. 6D. This coincides with the maximum value of the line voltage (line voltages v _ab , v _bc , v _ca shown in FIGS. 6A to 6C).

As described above, in the voltage conversion device 1a, the DC motor 2 supplied with the DC current rotates the rotor of the three-phase AC generator 3 at a speed proportional to the voltage, and the three-phase AC generator 3 An alternating current having a voltage proportional to the rotational speed of the rotor is generated. The rectifier 4a converts the alternating current supplied from the three-phase alternating current generator 3 into a direct current.
That is, in the voltage conversion device 1a, the DC motor 2 is driven using the first battery 11a as a power source in a state where the DC output terminals 7a and 7ab of the rectifier 4a are connected to the pair of input terminals of the second battery 11b. A DC current having a voltage different from the DC current supplied from the first battery 11a to the DC motor 2 is supplied to the second voltage 11b. Therefore, while selecting the DC motor 2 that rotates at a predetermined speed, the voltage converter 1a in a state in which various terms of the three-phase AC generator 3 such as the total number of conductors, the number of poles, and the magnetic flux per pole are appropriately selected. By using this, the direct current input to the DC motor 2 can be raised to a desired voltage suitable for charging the second battery 11b and supplied to the second battery 11b.

Moreover, in the voltage converter 1a, since an inverter and a converter are not used, the whole structure becomes simple and the number of parts is reduced. Therefore, the voltage conversion device 1a can be made small and light to facilitate installation and carrying, and to reduce the manufacturing cost.
Furthermore, according to the voltage conversion device 1a, the rectifier 4a inverts either the positive part or the negative part of the sine wave to the other side of the alternating current generated by the three-phase alternating current generator 3. Thus, the AC current can be rectified over the entire cycle, so that the AC current can be efficiently converted into a DC current.

FIG. 7 is a circuit diagram according to a modification of the voltage conversion device 1a, and corresponds to a diagram in which the smoothing capacitor 13 is connected in parallel with the rectifier circuit of the rectifier 4a in the circuit diagram of FIG. 8A to 8C are diagrams showing an example of a path of a current flowing through the circuit shown in FIG. 7, and FIG. 9 shows a time waveform of the output voltage of the circuit shown in FIG. It is the shown graph.
FIGS. 8A and 8B show current paths when the smoothing capacitor 13 is charged in Mode 1 and Mode 4 described with reference to FIGS. 4A and 5A, respectively. FIG. 8C shows a current path when the smoothing capacitor 13 is discharged. Also, the thick black line shown in FIG. 9 represents the output voltage of the above circuit.

As shown in FIG. 8 (a), because the highest phase voltage _{v a} at Mode1, the diode _{D 1} conducts the positive side of the smoothing capacitor 13, as shown in FIG. 8 (b), the Mode4 phase voltage v since _b is the highest, the diode D ₃ conducts to the positive side of the smoothing capacitor 13. Further, as shown in FIG. 8C, when the smoothing capacitor 13 is discharged, no current flows from the a phase to the c phase with respect to the smoothing capacitor 13.
Note that the current paths of Mode 2 and Mode 5 are the same as those of Mode 1 and Mode 4 except that the diodes conducting to the smoothing capacitor 13 are different.

That is, as shown in FIG. 7, when the voltage conversion device 1 a includes the smoothing capacitor 13, the smoothing capacitor 13 is discharged when the line voltage decreases in each mode, so that a voltage is applied to the load 12. . As a result, the output voltage of the voltage conversion device 1a (the voltage between the DC output terminals 7a and 7b in FIG. 7A) varies less as shown by the thick black lines in FIG.
That is, by providing the smoothing capacitor 13 in the rectifier 4a in the voltage conversion device 1a, fluctuations in the output voltage can be suppressed.

FIG. 10A is a circuit diagram of a three-phase AC generator and a rectifier in the voltage conversion apparatus according to the second embodiment, and FIG. 10B is a diagram showing a modification thereof. FIG. 11A to FIG. 11C are diagrams showing paths of current flowing through the circuit shown in FIG. FIG. 12A is a graph showing the time waveform of the phase voltage in the voltage converter of Example 2, and FIGS. 12B and 12C are FIGS. 10A and 10B, respectively. 6 is a graph showing a time waveform of the output voltage of the circuit shown in FIG.
Note that the thick black lines shown in FIGS. 12B and 12C represent the output voltage of the circuit described above. The components shown in FIGS. 1 to 9 are denoted by the same reference numerals, and description thereof is omitted.

Voltage conversion device 1b of this embodiment, the voltage conversion device 1a of the first embodiment, in place of the rectifier 4a of the diode D ₁ to D ₆ is made of a full-wave rectifier circuit of the bridge-connected structure, FIG. 10 (a) or as shown in FIG. 10 (b), the DC output terminal 7a, the diode D ₁ to D ₃ has a structure that includes a rectifier 4b made half-wave rectifier circuit connected in parallel with respect to 7b.

In the voltage conversion device 1b having the above structure, as shown in FIG. 10 (a) or FIG. 10 (b), since the three-phase half-wave rectifier circuits are connected in parallel, only in the phase with the highest voltage. Current flows. The current flows in three modes (hereinafter referred to as Mode 1 to Mode 3) that change over time as shown in FIGS. 11 (a) to 11 (c) depending on the magnitude of the phase voltages v _{a to} v _c . )).

(Mode 1)
If the phase voltage v _a is the highest, as shown in FIG. 11 (a), current flowing through the load 12 through the diode D ₁ from a phase, returns to a phase.
(Mode2)
If the phase voltage v _b is the highest, as shown in FIG. 11 (b), current flowing through the b-phase load through the diode D ₂ to 12 returns again to b phase.
(Mode 3)
If the phase voltage v _c is the highest, as shown in FIG. 11 (c), a current flowing to the load 12 through the diode D ₃ from c-phase, it returns to the c-phase.

As is clear from FIGS. 11 (a) to 11 (c), in the circuit shown in FIG. 10 (a) or 10 (b), the voltage of each phase shows a negative value in the a phase to the c phase. Since the current flowing in the direction is cut by the diodes D _{1 to} D ₃ , only the current flowing in the direction in which the voltage of each phase shows a positive value flows to the load 12. Therefore, as shown in FIG. 12 (a), the time waveform of the voltage generated in the half-wave rectifier circuit of the three phases, in the time waveform of the phase voltage v _a to v _c shown in FIG. 2 (b), the voltage A region where is a negative value is cut.
In this case, the output voltage of the voltage converter 1b (the voltage between the DC output terminals 7a and 7b in FIG. 10A) is the phase voltage (in each mode) as shown by the thick black line in FIG. This coincides with the maximum value of the phase voltages v _{a to} v _c ) shown in FIG. Note that the voltage between the DC output terminals 7a and 7b in FIG. 10B is as shown by a thick black line in FIG. 12C for the same reason as in FIGS. Variation is suppressed.

  In the voltage converter 1b, only one of the positive part or the negative part of the sine wave is taken out of the alternating current generated in the three-phase alternating current generator 3 by the rectifier 4b, and the other current is blocked. The And in the voltage converter 1b, since the alternating current supplied from the three-phase alternating current generator 3 passes only one diode inside the rectifier 4b, the effect that energy loss can be suppressed to the minimum can be expected.

FIG. 13 is a circuit diagram of a three-phase AC generator and a rectifier in the voltage conversion apparatus according to the third embodiment. In addition, about the component shown in FIG. 1 thru | or FIG. 12, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIG. 13, the voltage conversion device 1c of the present embodiment is the same as the voltage conversion device 1a of the first embodiment in that one end is an anode of diodes D ₁ , D ₃ , D ₅ and diodes D ₂ , D ₄ , D _6. The armature coils 3d to 3f are arranged so as to generate voltages whose phases are advanced by 60 ° with respect to the armature coils 3a to 3c, respectively. It has a structure with.

  The above structure corresponds to that the total number of conductors Z is doubled in the above-described formula (6) representing the electromotive force of the voltage conversion device 1a of the first embodiment. Therefore, according to the voltage converter 1c, when all other conditions are the same as those of the voltage converter 1a, an electromotive force that is twice that of the voltage converter 1a is ideally obtained.

  The present invention can be used when charging electricity stored in a battery by solar power generation or the like to another battery having a larger battery capacity.

DESCRIPTION OF SYMBOLS 1a, 1b ... Voltage converter 2 ... DC motor 3 ... Three-phase alternating current generator 3a-3f ... Armature coil 4a, 4b ... Rectifier 5 ... Case 6 ... Handle 7a, 7b ... DC output terminal 8 ... Ventilation window 9 ... input terminal 10 ... solar power generation system 11a ... first battery 11b ... second battery 12 ... load 13 ... smoothing capacitor D ₁ to D 6 _... diodes

Claims (4)

A rectifier having an AC input terminal and a DC output terminal;
A three-phase AC generator in which an AC output terminal is connected to the AC input terminal of the rectifier;
And a DC motor that rotationally drives the three-phase AC generator.   The voltage converter according to claim 1, wherein the rectifier includes a full-wave rectifier circuit configured by a bridge connection of six diodes.   The voltage converter according to claim 1, wherein the rectifier includes a half-wave rectifier circuit configured such that three diodes are respectively connected in parallel to the pair of DC output terminals. apparatus.   The voltage converter according to any one of claims 1 to 3, further comprising a smoothing capacitor connected in parallel with the rectifier.

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