JP2009290971A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply system for charging a battery even when an engine operates at a low speed. <P>SOLUTION: The power supply system has a three-phase AC generator; a group of first capacitors to be charged by the line output voltage of the three-phase AC generator; a group of second capacitors connected between one output end of a full-wave rectification type multiple voltage circuit and each of connection points of Δ connections of the three-phase AC generator or between the one output end of the full-wave rectification type multiple voltage circuit and a terminal of each phase opposite to the neutral point of Y connections of the three-phase AC generator; a group of first diodes each connected between the other output end of the full-wave rectification type multiple voltage circuit and one end of each of the group of first capacitors, and preventing discharging of each of the group of first capacitors; and a group of second diodes each connected between one output end of the full-wave rectification type multiple voltage circuit and one end of each of the group of second capacitors, and preventing discharging of each of the group of second capacitors. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply system that supplies power generated by an alternating current generator to a load, and particularly includes an alternating current generator that is mounted on a vehicle and driven by an engine output, and is used for a battery and other loads. The present invention relates to a power supply system suitable for supplying power.

  In a conventional power supply system that is used in motorcycles using a short regulator, the generator generates more power than is necessary for charging the battery when the engine is running at high speed, and the output voltage of the generator Exceeds the upper limit voltage of the battery. For this reason, when the output voltage of the generator rises, the output terminals of the generator are short-circuited to reduce the load resistance of the power supply system, and the output voltage of the rectifier circuit is maintained at a voltage slightly higher than the charging voltage of the battery. I am doing so.

That is, when the output voltage of the generator of the power supply system rises, the load resistance value is equivalently reduced by short-circuiting between the output terminals of the generator, and unnecessary power is lost. The output voltage is kept constant.
As described above, the short regulator generates excess energy as heat and throws it away, so that there is a problem that energy efficiency is low and heat generation is large.

  On the other hand, the energy loss due to the internal resistance of the AC generator is controlled by controlling the operating point of the AC generator so that it operates at a lower current side than the output current corresponding to the maximum power operating point of the AC generator. Has been proposed (see, for example, Patent Document 1).

An example of the configuration of a conventional power supply system is shown in FIG. In the figure, the conventional power supply system includes a three-phase AC generator 100 in which three-phase U, V, and W-phase circuits 100a, 100b, and 100c are Y-connected, and a rectifier circuit that includes diodes D1 to D6. 102 and a DC-DC converter 104 that adjusts the level of the output voltage of the rectifier circuit 102.
A load RL is connected to the output end of the DC-DC converter 104, and a battery 106 is connected in parallel to the load RL.

  In the above configuration, as shown in FIG. 6, from the AC generator 100, the voltages Vu, Vv, and Vw whose phases are different by (2/3) π from the U, V, and W phase circuits 100a, 100b, and 100c, respectively. It is output and full-wave rectified by the rectifier circuit 102. The output voltage of the rectifier circuit 102 at this time is (√3) × V (where V is each peak voltage of Vu, Vv, and Vw) in terms of peak voltage.

The voltage level of the output voltage of the rectifier circuit 102 is adjusted by the DC-DC converter 104, the output voltage of the DC-DC converter 104 is supplied to the load RL, and the battery 106 is charged by the output voltage of the DC-DC converter 104. Is done.
JP 2000-341997 A

  However, in the power supply system shown in Patent Document 1, the energy efficiency is improved, but the output voltage of the AC generator supplied to the load side decreases at the time of low engine rotation, and the battery cannot be charged. There was a problem.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply system capable of charging a battery even when the engine is running at a low speed.

  In order to achieve the above object, a power supply system according to the present invention is a power supply system that supplies power generated by a three-phase AC generator to a load, and each of the three-phase circuits is Δ-connected or Y-connected. The three-phase AC generator, and a full-wave rectification type voltage doubler circuit that rectifies and doubles the output voltage of the three-phase AC generator, the full-wave rectification type voltage doubler circuit, A first capacitor group connected between the output terminals of the Δ-connection or Y-connection of the three-phase AC generator and charged by the output voltage between the lines, and one output terminal of the full-wave rectification type voltage doubler circuit Between the delta connection of the three-phase AC generator and the output point of one of the full-wave rectification type voltage doubler circuit and the neutral point of the Y-connection of the three-phase AC generator A second capacitor group connected between terminals of each phase of the full-wave rectification type voltage doubler circuit A first diode group which is connected between one output terminal and one terminal of each capacitor of the first capacitor group and prevents discharge of electric charge charged in each capacitor of the first capacitor group And one of the output terminals of the full-wave rectification type voltage doubler circuit and one terminal of each capacitor of the second capacitor group, and charged to each capacitor of the second capacitor group And a second diode group for preventing discharge of electric charge.

  The power supply system of the present invention is a power supply system that supplies power generated by a three-phase alternating current generator to a load, wherein the three-phase circuits are Δ-connected or Y-connected. And a full-wave rectification type voltage doubler circuit that full-wave rectifies and doubles each line voltage of the three-phase AC generator, and the full-wave rectification type voltage doubler circuit includes the three-phase alternating current circuit. A first capacitor group connected between the output terminals of the Δ connection or Y connection of the generator and charged by the output voltage between the lines, one output terminal of the full-wave rectification type voltage doubler circuit, and the three Phases between the connection points of the Δ connection of the phase alternator or one of the output terminals of the full-wave rectification type voltage doubler circuit and the neutral point of the Y connection of the three-phase alternator A second capacitor group connected to the other terminal, and the other output terminal of the full-wave rectification type voltage doubler circuit; A first diode group connected between one terminal of each capacitor of the first capacitor group and blocking discharge of charges charged in each capacitor of the first capacitor group; and the full wave A second terminal connected between one output terminal of the rectifier type voltage doubler circuit and one terminal of each capacitor of the second capacitor group, and prevents discharge of charges charged in the second capacitor group. Each of the line voltage outputs of the three-phase AC generator included in a discharge path including the load and the line voltage outputs of the load. The charging voltage of the corresponding capacitor among the first capacitor groups connected between the line-to-line output terminals of the three-phase AC generator to be output and the charging voltage of the corresponding capacitor among the second capacitor groups Added A voltage corresponding to the voltage, characterized in that it is supplied with.

In the power supply system of the present invention having the above configuration, the full-wave rectification type voltage doubler circuit full-wave rectifies each line voltage of the three-phase AC generator in which each of the three-phase circuits is Δ-connected or Y-connected, And a first capacitor group connected between the output terminals of the Δ-connection or Y-connection of the three-phase AC generator and charged by the output voltage between the lines, and one output of the full-wave rectification type voltage doubler circuit Between one end of the three-phase AC generator and the connection point of the Δ-connection of the three-phase AC generator, or one of the output ends of the full-wave rectification type voltage doubler circuit and the neutral point of the Y-connection of the three-phase AC generator Each capacitor of the second capacitor group connected between the terminals of each phase on the side is charged.
At this time, the first capacitor group is connected by the first diode group connected between the other output terminal of the full-wave rectification type voltage doubler circuit and one terminal of each capacitor of the first capacitor group. The charge charged in each capacitor of the group is prevented from being discharged, and is connected between one output terminal of the full-wave rectification type voltage doubler circuit and one of the capacitors of the second capacitor group. The second diode group prevents the charge charged in the second capacitor group from being discharged.

The load includes a line voltage output of each of the three-phase AC generators included in a discharge path including the load when power is supplied to the load, and the three-phase AC generator from which the line voltage outputs are output. In accordance with a voltage obtained by adding the charging voltage of the corresponding capacitor of the first capacitor group connected between the output terminals of the respective lines and the charging voltage of the corresponding capacitor of the second capacitor group. Voltage is supplied.
As a result, a sufficiently high voltage can be supplied to the load side even when the engine is running at a low speed, so that the battery can be charged even when the engine is running at a low speed.

  As described above, according to the power supply system of the present invention, a sufficiently high voltage can be supplied to the load even when the engine is running at a low speed, and the battery can be charged even when the engine is running at a low speed. It becomes.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration of a power supply system according to the first embodiment of the present invention. In the figure, the power supply system according to the second embodiment of the present invention includes a three-phase AC generator 10 in which three-phase U, V, and W-phase circuits 10a, 10b, and 10c are Y-connected, Full-wave rectification type voltage doubler circuit 20 composed of capacitors C1 to C6 and diodes D1 to D12 connected between the output terminals between the lines of phase AC generator 10, and the output voltage level of full-wave rectification type voltage doubler circuit 20 And a DC-DC converter 30 for adjusting the frequency.

A load RL is connected to the output end of the DC-DC converter 30, and a battery 40 is connected in parallel to the load RL.
In the full-wave rectification type voltage doubler circuit 20, the diodes D1 to D6 constitute a diode bridge that performs rectification, and the diodes D7 to D9 are one output terminal of the full-wave rectification type voltage doubler circuit 20 and capacitors C1, C3, and C5. Each capacitor is connected to one terminal of each capacitor and has a function of preventing the charges charged in the capacitors C1, C3, and C5 from being discharged.

The diodes D10 to D12 are respectively connected between the other output terminal of the full-wave rectification type voltage doubler circuit 20 and one terminal of each of the capacitors C2, C4, C6, and are connected to the capacitors C2, C4, C6. It has a function of preventing the charged charge from being discharged. Here, the diodes D7 to D9 correspond to the first diode group of the present invention, and the diodes D10 to D12 correspond to the second diode group of the present invention.
The capacitors C1, C3, and C5 correspond to the first capacitor group of the present invention, and the capacitors C2, C4, and C6 correspond to the second capacitor group of the present invention.

The DC-DC converter 30 has a function of adjusting the voltage level of the output voltage of the full-wave rectification type voltage doubler circuit 20.
In the above configuration, as shown in FIG. 2, the three-phase AC generator 10 is supplied with voltages Vu, Vv, and Vw whose phases are different from each other by (2/3) π with respect to the U, V, and W phase circuits 10 a and 10 b. , 10 c and the output voltage Vout subjected to voltage doubler rectification by the full-wave rectification type voltage doubler circuit 20 is output to the DC-DC converter 30.

Capacitors C1 to C6 are charged by the line voltages of the respective U, V, and W phase circuits 10a, 10b, and 10c that are Y-connected. Here, the voltages Vu, Vv, and Vw (peak values) generated by the U, V, and W phase circuits 10a, 10b, and 10c are Vu = Vv = Vw = V.
The capacitor C1 has a line voltage Vwu (= √3V) between the W-phase circuit 10c and the U-phase circuit 10a, and the capacitor C3 has a line voltage Vuv (= √3V) between the U-phase circuit 10a and the V-phase circuit 10b. Thus, the capacitor C5 is charged by the line voltage Vvw (= √3V) between the V-phase circuit 10b and the W-phase circuit 10c.

That is, the capacitor C1 is charged with the polarity shown in FIG. 1 in the path of the W-phase circuit 10c → the diode D1 → the capacitor C1 → the U-phase circuit 10a by the line voltage Vwu between the W-phase circuit 10c and the U-phase circuit 10a. The voltage across C1 is Vwu (= √3V).
The capacitor C3 is charged with the polarity shown in FIG. 1 in the path of the U-phase circuit 10a → the diode D3 → the capacitor C3 → the V-phase circuit 10b by the line voltage Vuv between the U-phase circuit 10a and the V-phase circuit 10b. The voltage across C3 is Vuv (= √3V).

Further, the capacitor C5 is charged by the line voltage Vvw between the V-phase circuit 10b and the W-phase circuit 10c in the path of the V-phase circuit 10b → the diode D5 → the capacitor C5 → the W-phase circuit 10c with the polarity shown in FIG. The voltage across C5 is Vvw (= √3V).
Here, diodes D7, D8 respectively connected between one output terminal of the full-wave rectification type voltage doubler circuit 20 and one terminal of each capacitor of the capacitors C1, C3, C5 (first capacitor group). , D9 (first diode group) prevents the charges charged in the capacitors C1, C3, and C5 from being discharged.

  On the other hand, the capacitor C2 has a line voltage Vuw (= √3V) between the U-phase circuit 10a and the W-phase circuit 10c, and the capacitor C4 has a line voltage Vvu (= √V) between the V-phase circuit 10b and the U-phase circuit 10a. 3V), the capacitor C6 is charged by the line voltage Vwv (= √3V) between the W-phase circuit 10c and the V-phase circuit 10b.

That is, the capacitor C2 is charged by the line voltage Vuw between the U-phase circuit 10a and the W-phase circuit 10c in the path of the U-phase circuit 10a → the capacitor C2 → the diode D2 → the W-phase circuit 10c with the polarity shown in FIG. The voltage across C2 is Vuw (= √3V).
Capacitor C4 is charged with the polarity shown in FIG. 1 in the path of V-phase circuit 10b → capacitor C4 → diode D4 → U-phase circuit 10a by line voltage Vvu between V-phase circuit 10b and U-phase circuit 10a. The voltage across C4 is Vvu (= √3V).

  The capacitor C6 is charged with the polarity shown in FIG. 1 in the path of the W-phase circuit 10c → the capacitor C6 → the diode D6 → the V-phase circuit 10b by the line voltage Vwv between the W-phase circuit 10c and the V-phase circuit 10b. The voltage across C6 is Vwv (= √3V).

  Here, diodes D10 and D11 respectively connected between one output terminal of the full-wave rectification type voltage doubler circuit 20 and one terminal of each capacitor of the capacitors C2, C4 and C6 (second capacitor group). , D12 (second diode group) prevents the electric charges charged in the capacitors C2, C4, and C6 from being discharged.

  In this way, the capacitors C1 to C6 are charged by the line voltages of the U-phase circuits 10a, 10b, and 10c of the Y-connected U, V, and W phases. The output voltage Vout is the line voltage of any of the U, V, and W phase circuits 10a, 10b, and 10c. This is a voltage obtained by adding the voltage across terminals of one of the capacitors.

  That is, when the first capacitor group (C1, C3, C5) and the second capacitor group (C2, C4, C6) are discharged, the charging voltage of these capacitors functions as a power source, and the U, V, W phase A voltage obtained by adding the charging voltage of the capacitor to the line voltage of any of the phase circuits 10a, 10b, and 10c is output to the DC-DC converter 30 as the output voltage Vout of the full-wave rectification type voltage doubler circuit 20. .

This will be specifically described below.
When the line voltage Vuw (= √3V) between the U-phase circuit 10a and the W-phase circuit 10c is output to the output terminal of the wave rectification type voltage doubler circuit 20, the U-phase circuit 10a → the capacitor C1 → the diode D7 → Capacitors C1 and C6 are discharged through the path of output terminal of full-wave rectification type voltage doubler circuit 20, diode D12, capacitor C6, and W-phase circuit 10c.

  As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vuw between the U-phase circuit 10a and the W-phase circuit 10c, the charging voltage Vvw (= √3V) of the capacitor C1, and the charging of the capacitor C6. A voltage (√3V × 3) obtained by adding the voltage Vwv (= √3V), that is, a voltage three times the line voltage Vuw between the U-phase circuit 10a and the W-phase circuit 10c is output. At the same time, the capacitor C2 is charged by the line voltage Vuw between the U-phase circuit 10a and the W-phase circuit 10c.

  Similarly, when the line voltage Vuv (= √3V) between the U-phase circuit 10a and the V-phase circuit 10b is output to the output terminal of the full-wave rectification type voltage doubler circuit 20, the U-phase circuit 10a → the capacitor C1. → Diode D7 → Output terminal of full-wave rectification type voltage doubler circuit 20 → Diode D11 → Capacitor C4 → Capacitors C1 and C4 are discharged through a path of V-phase circuit 10b.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vuv between the U-phase circuit 10a and the V-phase circuit 10b, the charging voltage Vvw (= √3V) of the capacitor C1, and the charging of the capacitor C4. A voltage (√3V × 3) obtained by adding the voltage Vvu (= √3V), that is, a voltage that is three times the line voltage Vuv between the U-phase circuit 10a and the V-phase circuit 10b is output.
At the same time, the capacitor C3 is charged by the line voltage Vuv between the U-phase circuit 10a and the V-phase circuit 10b.

  When the line voltage Vvw (= √3 V) between the V-phase circuit 10b and the W-phase circuit 10c is output to the output terminal of the full-wave rectification type voltage doubler circuit 20, the V-phase circuit 10b → the capacitor C3 → Capacitors C3 and C6 are discharged through a path of diode D8 → output terminal of full-wave rectification type voltage doubler circuit 20 → diode D12 → capacitor C6 → W phase circuit 10c.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vvw between the V-phase circuit 10b and the W-phase circuit 10c, the charging voltage Vuv (= √3V) of the capacitor C3, and the charging of the capacitor C6. A voltage (√3V × 3) obtained by adding the voltage Vwv (= √3V), that is, a voltage three times the line voltage Vvw between the V-phase circuit 10b and the W-phase circuit 10c is output.
At the same time, the capacitor C5 is charged by the line voltage Vvw between the V-phase circuit 10b and the W-phase circuit 10c.

  When the line voltage Vvu (= √3 V) between the V-phase circuit 10b and the U-phase circuit 10a is output to the output terminal of the full-wave rectification type voltage doubler circuit 20, the V-phase circuit 10b → the capacitor C3 → Capacitors C3 and C2 are discharged through a path of diode D8 → output terminal of full-wave rectification type voltage doubler circuit 20 → diode D10 → capacitor C2 → U-phase circuit 10a.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vvu between the V-phase circuit 10b and the U-phase circuit 10a, the charging voltage Vuv (= √3V) of the capacitor C3, and the charging of the capacitor C2. A voltage (√3V × 3) obtained by adding the voltage Vuw (= √3V), that is, a voltage that is three times the line voltage Vvu between the V-phase circuit 10b and the U-phase circuit 10a is output.
At the same time, the capacitor C4 is charged by the line voltage Vvu between the V-phase circuit 10b and the U-phase circuit 10a.

  When the line voltage Vwu (= √3 V) between the W-phase circuit 10c and the U-phase circuit 10a is output to the output terminal of the full-wave rectification type voltage doubler circuit 20, the W-phase circuit 10c → the capacitor C5 → Capacitors C5 and C2 are discharged through a path of diode D9 → output terminal of full-wave rectification type voltage doubler circuit 20 → diode D10 → capacitor C2 → U-phase circuit 10a.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vwu between the W-phase circuit 10c and the U-phase circuit 10a, the charging voltage Vvw ((= √3V) of the capacitor C5, and the capacitor C2 A voltage (√3V × 3) obtained by adding the charging voltage Vuw (= √3V), that is, a voltage three times the line voltage Vwu between the W-phase circuit 10c and the U-phase circuit 10a is output.
At the same time, the capacitor C1 is charged by the line voltage Vwu between the W-phase circuit 10c and the U-phase circuit 10a.

  When the line voltage Vwv (= √3V) between the W-phase circuit 10c and the V-phase circuit 10b is output to the output terminal of the full-wave rectification type voltage doubler circuit 20, the W-phase circuit 10c → the capacitor C5 → Capacitors C5 and C4 are discharged through the path of diode D9 → output terminal of full-wave rectification type voltage doubler circuit 20 → diode D11 → capacitor C4 → −V phase circuit 10b.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 includes the line voltage Vwv between the W-phase circuit 10c and the V-phase circuit 10b, the charging voltage Vvw ((= √3V) of the capacitor C5, and the capacitor C4. A voltage (√3V × 3) obtained by adding the charging voltage Vvu (= √3V), that is, a voltage three times the line voltage Vwv between the W-phase circuit 10c and the V-phase circuit 10b is output.
At the same time, the capacitor C6 is charged by the line voltage Vwv between the W-phase circuit 10c and the V-phase circuit 10b.

In this way, the output voltage Vout (= √3V × 3) is supplied from the full-wave rectification type voltage doubler circuit 20 to the DC-DC converter 30.
The voltage level of the output voltage Vout of the full-wave rectification type voltage doubler circuit 20 is adjusted by the DC-DC converter 30, the output voltage of the DC-DC converter 30 is supplied to the load RL, and the battery 40 is connected to the DC-DC converter 30. It is charged by the output voltage.

According to the power supply system according to the first embodiment of the present invention, an output voltage larger than that of a power supply system using a conventional Y-connected AC generator can be obtained.
Therefore, a sufficiently high voltage can be supplied to the load side even when the engine is running at a low speed, and the battery can be charged even when the engine is running at a low speed.

Next, a power supply system according to a second embodiment of the present invention will be described. FIG. 3 shows a configuration of a power supply system according to the second embodiment of the present invention. In the figure, a power supply system according to a second embodiment of the present invention includes a three-phase AC generator 10A in which three-phase U, V, and W-phase circuits 10a, 10b, and 10c are Δ-connected, Full-wave rectification type voltage doubler circuit 20A composed of capacitors C1 to C6 and diodes D1 to D12 connected between the line-to-line output terminals of phase AC generator 10A, and the output voltage level of full-wave rectification type voltage doubler circuit 20A And a DC-DC converter 30 for adjusting the frequency.
A load RL is connected to the output end of the DC-DC converter 30, and a battery 40 is connected in parallel to the load RL.

  The power supply system according to the second embodiment of the present invention is different in configuration from the power supply system according to the first embodiment in that each phase circuit of the three-phase AC generator is Δ-connected. The configuration is the same as that of the power supply system according to the first embodiment.

  In the full-wave rectification type voltage doubler circuit 20A, the diodes D1 to D6 constitute a diode bridge that performs rectification, and the diodes D7 to D9 are one output terminal of the full-wave rectification type voltage doubler circuit 20A and capacitors C1, C3, and C5. Each capacitor is connected to one terminal of each capacitor and has a function of preventing the charges charged in the capacitors C1, C3, and C5 from being discharged.

  The diodes D10 to D12 are respectively connected between the other output terminal of the full-wave rectification type voltage doubler circuit 20A and one terminal of each of the capacitors C2, C4, C6, and are connected to the capacitors C2, C4, C6. It has a function of preventing the charged charge from being discharged. Here, the diodes D7 to D9 correspond to the first diode group of the present invention, and the diodes D10 to D12 correspond to the second diode group of the present invention.

The capacitors C1, C3, and C5 correspond to the first capacitor group of the present invention, and the capacitors C2, C4, and C6 correspond to the second capacitor group of the present invention.
The DC-DC converter 30 has a function of adjusting the voltage level of the output voltage of the full-wave rectification type voltage doubler circuit 20A.
In the above configuration, as shown in FIG. 4, the three-phase AC generator 10 has voltages Vu, Vv, and Vw whose phases are different from each other by (2/3) π from each of the U, V, and W phase circuits 10a, 10b, The output voltage Vout output from 10c and voltage doubled by the full-wave rectification type voltage doubler circuit 20A is output to the DC-DC converter 30.

Capacitors C1 to C6 are charged by the line voltage of U-phase, V-phase, and W-phase circuits 10a, 10b, and 10c that are Δ-connected. Here, the voltages Vu, Vv, and Vw (peak values) generated by the U, V, and W phase circuits 10a, 10b, and 10c are Vu = Vv = Vw = V.
Capacitors C1 and C2 are due to the line voltage Vu (= V) of the U-phase circuit 10a, capacitors C3 and C4 are due to the line-to-line voltage Vv (= V) of the V-phase circuit 10b, and capacitors C5 and C6 are W-phase circuits. The battery is charged by the line voltage Vw (= V) of 10c.

That is, the capacitor C1 is charged by the line voltage Vu of the U-phase circuit 10a with the polarity shown in FIG. 1 in the path of the U-phase circuit 10a → the diode D1 → the capacitor C1 → the U-phase circuit 10a. Becomes Vu (= V).
Similarly, the capacitor C2 is charged by the line voltage Vu of the U-phase circuit 10a with the polarity shown in FIG. 1 in the path of the U-phase circuit 10a → the capacitor C2 → the diode D2 → the U-phase circuit 10a, and is connected between both ends of the capacitor C2. The voltage is Vu (= V).

The capacitor C3 is charged with the polarity shown in FIG. 1 in the path of the V-phase circuit 10b → the diode D3 → the capacitor C3 → the V-phase circuit 10b by the line voltage Vv between the V-phase circuits 10b, and the voltage across the capacitor C3. Becomes Vv (= V).
Similarly, the capacitor C4 is charged with the polarity shown in FIG. 1 in the path of the V-phase circuit 10b → the capacitor C4 → the diode D4 → the V-phase circuit 10b by the line voltage Vv between the V-phase circuits 10b, and between both ends of the capacitor C4. The voltage is Vv (= V).

Furthermore, the capacitor C5 is charged with the polarity shown in FIG. 1 in the path of the W-phase circuit 10c → the diode D5 → the capacitor C5 → the W-phase circuit 10c by the line voltage Vw between the W-phase circuit 10c, and the voltage across the capacitor C5 Becomes Vw (= V).
Similarly, the capacitor C6 is charged by the line voltage Vw between the W-phase circuits 10c with the polarity shown in FIG. 1 in the path of the W-phase circuit 10c → the capacitor C6 → the diode D6 → the W-phase circuit 10c, and between both ends of the capacitor C5. The voltage is Vw (= V).

Here, diodes D7, D8 respectively connected between one output terminal of the full-wave rectification type voltage doubler circuit 20A and one terminal of each capacitor C1, C3, C5 (first capacitor group). , D9 (first diode group) prevents the charges charged in the capacitors C1, C3, and C5 from being discharged.
Further, diodes D10, D11, respectively connected between one output terminal of the full-wave rectification type voltage doubler circuit 20A and one terminal of each capacitor of the capacitors C2, C4, C6 (second capacitor group), D12 (second diode group) prevents the electric charges charged in the capacitors C2, C4, and C6 from being discharged.

  In this manner, the capacitors C1 to C6 are charged by the line voltages of the U-phase circuits 10a, 10b, and 10c of Δ-connected, so that the full-wave rectification type voltage doubler circuit 20 The output voltage Vout is the line voltage of any of the U, V, and W phase circuits 10a, 10b, and 10c. This is a voltage obtained by adding the voltage across terminals of one of the capacitors.

  That is, when the first capacitor group (C1, C3, C5) and the second capacitor group (C2, C4, C6) are discharged, the charging voltage of these capacitors functions as a power source, and the U, V, W phase A voltage obtained by adding the charging voltage of the capacitor to the line voltage of any of the phase circuits 10a, 10b, and 10c is output to the DC-DC converter 30 as the output voltage Vout of the full-wave rectification type voltage doubler circuit 20. .

This will be specifically described below.
When the line voltage Vu (= V) of the U phase circuit 10a is output to the output terminal of the wave rectification type voltage doubler circuit 20, the U phase circuit 10a → the capacitor C1 → the diode D7 → the full wave rectification type voltage doubler circuit. Capacitors C1 and C6 are discharged through a path of 20A output terminal → diode D12 → capacitor C6 → U-phase circuit 10a.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20A includes the line voltage Vu of the U-phase circuit 10a, the charging voltage Vu (= V) of the capacitor C1, and the charging voltage Vw (= V) of the capacitor C6. The added voltage (3V), that is, a voltage that is three times the line voltage Vu of the U-phase circuit 10a is output.
At the same time, the capacitor C2 is charged by the line voltage Vu of the U-phase circuit 10a.

  Similarly, when the line voltage Vv (= V) of the V-phase circuit 10b is output to the output terminal of the full-wave rectification type voltage doubler circuit 20A, the V-phase circuit 10b → capacitor C3 → diode D8 → full-wave rectification. Capacitors C3 and C2 are discharged through the path of the output terminal of the type voltage doubler circuit 20A → the diode D10 → the capacitor C2 → the V-phase circuit 10b.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20A includes the line voltage Vv of the V-phase circuit 10b, the charging voltage Vv (= V) of the capacitor C3, and the charging voltage Vu (= V) of the capacitor C2. The added voltage (3V), that is, a voltage that is three times the line voltage Vv of the V-phase circuit 10b is output.
At the same time, the capacitor C4 is charged by the line voltage Vv of the V-phase circuit 10b.

  When the line voltage Vw (= V) of the W-phase circuit 10c is output to the output terminal of the full-wave rectification type voltage doubler circuit 20A, the W-phase circuit 10c → capacitor C5 → diode D9 → full-wave rectification type. Capacitors C5 and C4 are discharged along the path of output terminal of voltage doubler circuit 20A → diode D11 → capacitor C4 → W-phase circuit 10c.

As a result, the output voltage Vout of the full-wave rectification type voltage doubler circuit 20A includes the line voltage Vw of the W-phase circuit 10c, the charging voltage Vw (= V) of the capacitor C5, and the charging voltage Vv (= V) of the capacitor C4. The added voltage (3V), that is, a voltage that is three times the line voltage Vw of the W-phase circuit 10c is output.
At the same time, the capacitor C6 is charged by the line voltage Vw of the W-phase circuit 10c.

In this way, the output voltage Vout (= 3 V) is supplied to the DC-DC converter 30 from the full-wave rectification type voltage doubler circuit 20A.
The voltage level of the output voltage Vout of the full-wave rectification type voltage doubler circuit 20A is adjusted by the DC-DC converter 30, the output voltage of the DC-DC converter 30 is supplied to the load RL, and the battery 40 includes a DC-DC converter. It is charged by 30 output voltage.

The power supply system according to the second embodiment of the present invention uses a three-phase AC generator in which the three-phase U, V, and W phase circuits 10a, 10b, and 10c are Δ-connected. Regardless, it is possible to obtain an output voltage larger than that of a power supply system using a conventional Y-connected AC generator.
Therefore, a sufficiently high voltage can be supplied to the load side even when the engine is running at a low speed, and the battery can be charged even when the engine is running at a low speed.

1 is a circuit diagram showing a configuration of a power supply system according to a first embodiment of the present invention. The wave form diagram which shows the operation | movement of the electric power supply system which concerns on 1st Embodiment of this invention shown in FIG. The circuit diagram which shows the structure of the electric power supply system which concerns on 2nd Embodiment of this invention. The wave form diagram which shows operation | movement of the electric power supply system which concerns on 2nd Embodiment of this invention shown in FIG. The circuit diagram which shows the structure of the conventional power supply system. The wave form diagram which shows operation | movement of the conventional electric power supply system shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 10A ... Three-phase alternating current generator, 20, 20A ... Half wave rectification type voltage doubler circuit, 30 ... DC-DC converter, 40 ... Battery, RL ... Load

Claims (2)

A power supply system that supplies power generated by a three-phase AC generator to a load,
A three-phase AC generator in which each of the three-phase circuits is Δ-connected or Y-connected;
A full-wave rectification type voltage doubler circuit that rectifies and doubles the output voltage of the three-phase AC generator;
Have
The full wave rectification type voltage doubler circuit is:
A first capacitor group connected between the output terminals of the Δ connection or Y connection of the three-phase AC generator and charged by the output voltage between the lines;
Between one output end of the full-wave rectification type voltage doubler circuit and each connection point of Δ connection of the three-phase AC generator, or one output end of the full-wave rectification type voltage doubler circuit and the three-phase AC A second capacitor group connected between terminals of each phase opposite to the neutral point of the Y connection of the generator;
Connected between the other output terminal of the full-wave rectifier type voltage doubler circuit and one terminal of each capacitor of the first capacitor group, the charge of each capacitor of the first capacitor group is charged. A first diode group for blocking discharge;
Connected between one output terminal of the full-wave rectifier type voltage doubler circuit and one terminal of each capacitor of the second capacitor group, the charge of each capacitor of the second capacitor group is charged. A second diode group for preventing discharge;
A power supply system comprising: A power supply system that supplies power generated by a three-phase AC generator to a load,
A three-phase AC generator in which each of the three-phase circuits is Δ-connected or Y-connected;
A full-wave rectification type voltage doubler circuit that full-wave rectifies and doubles each line voltage of the three-phase AC generator;
Have
The full wave rectification type voltage doubler circuit is:
A first capacitor group connected between the output terminals of the Δ connection or Y connection of the three-phase AC generator and charged by the output voltage between the lines;
Between one output end of the full-wave rectification type voltage doubler circuit and each connection point of Δ connection of the three-phase AC generator, or one output end of the full-wave rectification type voltage doubler circuit and the three-phase AC A second capacitor group connected between terminals of each phase opposite to the neutral point of the Y connection of the generator;
Connected between the other output terminal of the full-wave rectifier type voltage doubler circuit and one terminal of each capacitor of the first capacitor group, the charge of each capacitor of the first capacitor group is charged. A first diode group for blocking discharge;
Connected between one output terminal of the full-wave rectification type voltage doubler circuit and one terminal of each capacitor of the second capacitor group, and prevents discharge of the charge charged in the second capacitor group. A second diode group;
Comprising
The load includes a line voltage output of each of the three-phase AC generators included in a discharge path including the load when power is supplied to the load, and the three-phase AC generator from which the line voltage outputs are output. The voltage according to the voltage obtained by adding the charging voltage of the corresponding capacitor among the first capacitor group connected between the output terminals of the lines and the charging voltage of the corresponding capacitor of the second capacitor group is A power supply system characterized by being supplied.

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