JP2007060857A - Three-phase ac generator battery charger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery charger capable of accurately controlling thyristors even if an output voltage of a three-phase AC generator increases. <P>SOLUTION: This three-phase AC generator battery charger turns off the thyristors S4, S5 and S6 when a battery voltage detector detects a voltage equal to or more than a predetermined value, where the three-phase AC generator 10 and a battery 8 are connected through an output of the AC generator 10 at respective phases AC1, AC2 and AC3 through a rectifier including the thyristors S4, S5 and S6 and ignition circuits 1d, 1e and 1f, and the battery 8 is connected with a voltage detector for detecting a battery voltage. This battery charger connects the thyristors S1, S2 and S3 and the ignition circuits 1a, 1b and 1c in series with the thyristors S4, S5 and S6 at the respective phases AC1, AC2 and AC3 and controls the ignition of the thyristors S1, S2, S3, S4, S5 and S6 by a phase control portion 100 for controlling ignition timings for the ignition circuits 1a, 1b, 1c, 1d, 1e and 1f. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a three-phase AC generator battery charging apparatus that charges a battery using a three-phase AC generator.

  Conventionally, an open-type battery charger using a three-phase AC generator is known (for example, refer to Patent Document 1). As shown in FIG. 4, the conventional open-type battery charging device includes a three-phase AC generator 20, a diode provided between the output (AC1 to AC3) of the three-phase AC generator 20 and the anode of the battery 18. Groups D11 to D13, thyristor groups S11 to S13 provided between the outputs (AC1 to AC3) of the three-phase AC generator 20 and the cathode of the battery 18, the ignition circuit 11, and the ignition trigger circuit 13, , A comparator 16, a reference voltage 17, a battery 18, and an external load 19.

  Diode groups D11 to D13 provided between the output of the three-phase AC generator 20 and the anode of the battery 18 and thyristor groups S11 to S13 provided between the output of the three-phase AC generator 20 and the cathode of the battery 18. In step S <b> 13, the output (AC <b> 1 to AC <b> 3) of the three-phase AC generator 20 is rectified and supplied to the battery 18.

  The ignition circuit 11 supplies a gate signal to the gates of the thyristors S11 to S13 by a signal from an ignition trigger circuit 13 described later. The ignition trigger circuit 13 generates an ignition trigger signal for the ignition circuit 11 in accordance with an output signal from the comparator 16 described later. The comparator 16 compares the reference voltage 17 with the terminal voltage of the battery 18 and outputs the comparison result to the ignition trigger circuit 13. In the conventional example of FIG. 4, the battery reference voltage for the three-phase AC voltage (line voltage), the output of the comparator 16, and the operation of the ignition circuit 11 are as shown in FIG. Moreover, the charging current waveform at the time of all outputs in the conventional example of FIG. 4 is as shown in FIG.

As another conventional example, an open-type battery charging device having phase control as shown in FIG. 7 is known. As shown in FIG. 7, this open-type battery charging device includes a three-phase AC generator 20, a diode group provided between the outputs (AC1 to AC3) of the three-phase AC generator 20 and the anode of the battery 18. D11 to D13, thyristor groups S11 to S13 provided between the outputs (AC1 to AC3) of the three-phase AC generator 20 and the cathode of the battery 18, ignition circuits 11a to 11c, and AC detection circuits 12a to 12c. 12c, firing trigger circuits 13a to 13c, triangular wave generation circuits 14a to 14c, comparator circuits 15a to 15c, differential amplifier 16, reference voltage 17, battery 18, and external load 19. ing.
Japanese Patent Laid-Open No. 10-70851

  However, in the battery charging device of FIG. 4, since S11, S12, and S13 are simultaneously lit, it is possible to take a charging current, but the speed characteristic of the battery voltage is poor, and due to the balance between the generator and the external load, In some cases, the energization width of each thyristor is different. Therefore, as shown in FIG. 7, when phase control is performed on the thyristors S11, S12, and S13, the difference between the speed characteristics of the battery voltage and the energization width of each thyristor can be solved. FIG. 8 shows an operation sequence of each circuit with respect to a three-phase AC voltage (line voltage) in the circuit of FIG. However, as can be seen from Equation 1, in this method, the charging current is greatly reduced to 0.717P. The reason for this is, for example, in the conventional open battery charger as shown in FIG. 7, for example, when focusing on the thyristor S11, the charging path is from the AC2 that is the output of the three-phase AC generator to the diode D12, A path from the anode through the cathode to the thyristor S11 (between AC2 and AC1), a path from the AC3 output from the three-phase AC generator to the diode D13, and a path from the battery anode to the cathode through the thyristor S11 (AC3-AC1) There are two paths between

  In this case, when the thyristor S11 is fired, a charging path is formed on the higher output voltage of the output voltage between AC2 and AC1 and the output voltage of AC3 to AC1. That is, a predetermined line voltage is generated between the outputs of the three-phase AC generator 20 (AC2-AC1, AC2-AC3, AC3-AC1, etc.). In the above example, the AC2-AC1 line is generated. On the left side, the AC3-AC1 charging loop and then the AC2-AC1 charging loop are commutated to the AC2-AC1 line voltage and the AC3-AC1 line voltage crossing point. -On the right side of the AC1 line voltage cross point, the charging loop is AC2-AC1.

  Therefore, when the load is small and the battery state is almost fully charged, the charging current may be small. Therefore, control should be performed in the charging loop on the AC2-AC1 side, but the conventional open as shown in FIG. Such a control can be performed in the battery charger. However, in the conventional open type battery charger, the thyristor can be turned on only from the cross point of the line voltage forming two charging loops. Therefore, the charging current waveform at all outputs is as shown in FIG. As shown in Equation 1, the average value of the charging current at all outputs is 0.717 Ip, which is 25% charging current compared to the case where phase control is not performed. There was a problem that decreased.

  In the ignition circuits 11a to 11c of FIG. 7, when the battery voltage (measured value) is close to the output voltage of the differential amplifier 16, the control angle is close to 180 degrees, and the battery voltage (measured value) is When away from the output voltage of the differential amplifier 16, the control angle is close to 60 degrees. Therefore, there is a problem that the phase control angle is narrow.

  Therefore, the present invention has been made in view of the above circumstances, and provides a three-phase AC generator battery charging device capable of accurately controlling a thyristor even when the output voltage of the three-phase AC generator is increased. For the purpose.

In order to solve the above-described problems, the present invention proposes the following means.
In the invention according to claim 1, the three-phase alternating current generator 10 and the battery 8 are in the phases AC1, AC2, and AC3, respectively, and the output of the alternating current generator 10 includes the thyristors S4, S5, and S6 and the ignition circuit 1d. 1e, 1f, the battery 8 is connected to a battery voltage detecting means for detecting a battery voltage, and when the battery voltage detecting means detects a voltage of a predetermined value or more, the thyristors S4, S5, In the three-phase AC generator battery charging apparatus in which S6 is turned off, thyristors S1, S2, S3 and ignition circuits 1a, 1b, and thyristors S1, S2, S3 in series with the thyristors S4, S5, S6 of the respective phases AC1, AC2, AC3, 1c is connected to the thyristor by a phase control unit 100 that controls the ignition timing of the ignition circuits 1a, 1b, 1c, 1d, 1e, and 1f. Proposes 1, S2, S3, S4, S5, the three-phase AC generator battery charging apparatus, characterized by controlling the ignition of S6.

  According to a second aspect of the present invention, in the three-phase AC generator battery charging device according to the first aspect, the phase control unit 100 has a line voltage of each phase AC1, AC2, AC3 of the three-phase AC generator 10. AC detection circuits 2a to 2c for detecting the voltage, triangular wave generation circuits 4a to 4c for generating a triangular wave from the AC voltage detected by the AC detection circuit, detection results of the battery voltage detection means, and the triangular wave generation circuit Comparator circuits 5a to 5c for comparing the triangular wave and an ignition signal for outputting an ignition signal to the ignition circuits 1a, 1b, 1c, 1d, 1e, and 1f based on the comparison results of the comparator circuits 5a to 5c. A three-phase alternating current generator battery charging device characterized by comprising trigger circuits 3a to 3f is proposed.

  According to the present invention, the potential difference between the reference voltage and the battery voltage is calculated by the differential amplifier, and the control angle at which the thyristor must be fired is determined by comparing the output result and the triangular wave, and the thyristor is arbitrarily set. Since the control angle can be controlled, the average charging current value at all outputs can be optimized. Further, since the phase control angle can be widened, there is an effect that optimum control is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the three-phase AC generator battery charging device according to this embodiment includes a three-phase AC generator 10, an output (AC1 to AC3) of the three-phase AC generator 10, and an anode of the battery 8. Thyristor groups S1 to S3 provided between them, thyristor groups S4 to S6 provided between the outputs (AC1 to AC3) of the three-phase AC generator 10 and the cathode of the battery 8, and ignition circuits 1a to 1f And AC detection circuits 2a to 2f, ignition trigger circuits 3a to 3f, triangular wave generation circuits 4a to 4c, comparator circuits 5a to 5c, which form a phase control unit (corresponding to phase control means) 100, and differential The amplifier 6 includes a reference voltage 7, a battery 8, and an external load 9.

  Thyristor groups S1 to S3 provided between the output of the three-phase AC generator 10 and the anode of the battery 8 and thyristor groups S4 to S3 provided between the output of the three-phase AC generator 10 and the cathode of the battery 8 S 6 rectifies the output voltage (AC 1 to AC 3) of the three-phase AC generator 10 and supplies it to the battery 8.

  The starting circuits 1a to 1f supply gate signals to the gates of the thyristor groups S1 to S6 based on signals from starting trigger circuits 3a to 3f, which will be described later, and start the thyristor groups S1 to S6.

  The AC detection circuits 2a to 2c detect AC components between outputs of the three-phase AC generator 10 (AC1-AC2, AC2-AC3, AC3-AC1, etc.), and the detected AC components are supplied to the triangular wave generation circuits 4a to 4c. Supply. The triangular wave generation circuits 4a to 4c generate triangular waves based on the AC components input from the AC detection circuits 2a to 2c.

  The comparator circuits 5a to 5c compare the output voltage value from the differential amplifier 6 described later with the triangular wave supplied from the triangular wave generation circuits 4a to 4c, and the triangular wave is lower than the output voltage value from the differential amplifier 6. Sometimes, a “Hi” level signal is output to the firing trigger circuits 3a to 3f. When the "Hi" level signal is input from the comparator circuits 5a to 5c, the ignition trigger circuits 3a to 3f supply control signals to the ignition circuits 1a to 1f. The differential amplifier 6 supplies a difference value between the terminal voltage of the battery 8 and the reference voltage 7 to the comparator circuits 5a to 5c.

  Next, a sequence in the three-phase AC generator battery charging device according to the present embodiment will be described with reference to FIG. First, when attention is paid to AC1-AC2, AC2-AC3, AC3-AC1 as the line voltages, the AC detection circuit 2a outputs a signal of “Hi” level when the line voltage of AC1-AC2 is a positive voltage. Output. Similarly, the AC detection circuit 2b is in the “Hi” level when the AC2-AC3 line voltage is a positive voltage, and the AC detection circuit 2c is in the “Hi” level when the AC3-AC1 line voltage is a positive voltage. Output a signal.

  The triangular wave generation circuit 4a outputs a triangular wave from the point when the line voltage of AC1-AC2 crosses zero and the phase angle becomes 30 ° until the line voltage of AC1-AC2 crosses zero again. . The same applies to the triangular wave generating circuits 4b and 4c. The triangular wave generated by the triangular wave generation circuit 4a is input to the comparator circuit 5a. The comparator circuit 5 a compares the triangular wave input from the triangular wave generation circuit 4 a with the output voltage input from the differential amplifier 6. Specifically, when the triangular wave falls below the output voltage input from the differential amplifier 6, a “Hi” level signal is output to the firing trigger circuit 3a. When the signal from the comparator circuit 5a is input, the ignition trigger circuit 3a generates a control signal and outputs it to the ignition circuit 1a. This series of operations is the same in the triangular wave generation circuits 4b and 4c, the comparator circuits 5b and 5c, and the firing trigger circuits 3b and 3c.

  Here, as shown in FIG. 1, the battery charger according to the present embodiment includes thyristor groups S1 to S3 between the outputs (AC1 to AC3) of the three-phase AC generator 10 and the anode of the battery 8, The difference from the conventional example is that a phase control unit 100 for controlling the ignition timing of the thyristor groups S1 to S6 is provided.

  Since the three-phase AC generator battery charging device of the present embodiment is configured as shown in FIG. 1, for example, when considering the charging path by paying attention to the thyristor S4, it is the output of the three-phase AC generator. The path from AC2 to thyristor S2, the path from the anode to the cathode of the battery to thyristor S4 (between AC2 and AC1), the output of the three-phase AC generator from AC3 to thyristor S3, the thyristor S4 from the battery anode to the cathode There are two paths to the path (between AC3 and AC1).

  However, in the three-phase AC generator battery charging device according to the present embodiment, unlike the conventional example, the thyristor groups S1 to S3 and S4 to S6 are provided on the anode side and the cathode side of the battery 1, respectively. The thyristors S1 to S6 to be operated can be arbitrarily determined and controlled so that gate signals are simultaneously supplied to the S1 and the thyristor S4 from the ignition circuit 1a and the ignition circuit 1d. Therefore, the charging path does not change depending on the phase control timing.

  Further, in the conventional example, control can be performed only from the cross point of the line voltage forming two charging loops. Therefore, as shown in FIG. 9, the charge current waveform at all outputs is the output current at the cross point. However, in the case of this embodiment, the combination of thyristors S1 to S6 to be operated is reduced. Since it can be arbitrarily determined, as shown in FIG. 3, the charging current waveform at all outputs does not have a drop at the cross point as seen in the conventional example. In addition, the average value of the charging current at the time of all outputs is 0.83 Ip, as shown in Equation 2, and is reduced by 13.4% compared to the case where phase control is not performed. An improvement effect of 11.6% is seen.

  Further, the ignition circuits 1a to 1f in the present embodiment shown in FIG. 1 supply gate signals to the thyristors at the output points of the differential amplifier 6 and the triangular wave cross points generated by the triangular wave generation circuits 4a to 4c. 2, when the battery voltage (measured value) is close to the output voltage of the differential amplifier 6, the control angle is close to 180 deg, and the battery voltage (measured angle) is that of the differential amplifier 6. When away from the output voltage, the control angle is close to 30 deg. Therefore, there is an effect that the phase control angle becomes wider than that in the prior art.

  Further, the ignition circuits 1a to 1f in the present embodiment shown in FIG. 1 are constituted by transistors, and the gate current path of each thyristor S1 to S6 is, for example, from the output AC1 of the three-phase AC generator to the ignition circuit 1a. After that, a loop is formed from the ignition circuit 1e through the gate and cathode of the thyristor S1, and from the ignition circuit 1e to the output AC2 of the three-phase AC generator through the gate and cathode of the thyristor S5. Therefore, even if the output voltage of the three-phase alternating current generator increases, as described above, the two semiconductor elements (ignition circuits 1a to 1f) enter the gate current path, and the voltage cannot be accurately controlled. Does not occur.

  Therefore, according to this embodiment, the control angle of the thyristor can be arbitrarily controlled, so that the average charging current value at all outputs can be optimized. In addition, since the phase control angle can be widened, optimal control is possible.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes designs and the like that do not depart from the gist of the present invention.

It is a block diagram of the battery charging device which concerns on this embodiment. It is the figure which showed the three-phase alternating current voltage waveform and waveform of each part of a circuit which concern on this embodiment. It is the figure which showed the charging current waveform at the time of all the outputs concerning this embodiment. It is a block diagram of the battery charging device which concerns on a prior art example. It is the figure which showed the three-phase alternating current voltage waveform and waveform of each part of a circuit which concern on a prior art example. It is the figure which showed the charging current waveform at the time of all the outputs concerning a prior art example. It is a block diagram of the battery charging device which concerns on a prior art example. It is the figure which showed the three-phase alternating current voltage waveform and waveform of each part of a circuit which concern on a prior art example. It is the figure which showed the charging current waveform at the time of all the outputs concerning a prior art example.

Explanation of symbols

  1a to 1f ... ignition circuit, 2a to 2c ... AC detection circuit, 3a to 3f ... ignition trigger circuit, 4a to 4c ... triangular wave generation circuit, 5a to 5c ... comparator circuit , 6 ... differential amplifier, 7 ... reference voltage, 8 ... battery, 9 ... external load, 10 ... three-phase AC generator, S1-S6 ... thyristor group, 100 ..Phase control unit (equivalent to phase control means)

Claims (2)

The three-phase AC generator 10 and the battery 8 are connected in phase AC1, AC2, and AC3, respectively, with the output of the AC generator 10 via rectifiers and igniters 1d, 1e, and 1f including thyristors S4, S5, and S6. The battery 8 is connected to battery voltage detection means for detecting battery voltage, and when the battery voltage detection means detects a voltage of a predetermined value or more, the thyristors S4, S5, S6 are turned off. In the phase alternator battery charger,
Thyristors S1, S2, S3 and ignition circuits 1a, 1b, 1c are connected in series to the thyristors S4, S5, S6 of the respective phases AC1, AC2, AC3, and the ignition circuits 1a, 1b, 1c, 1d, The three-phase alternating current generator battery charging device, wherein the ignition of the thyristors S1, S2, S3, S4, S5, and S6 is controlled by the phase control unit 100 that controls the ignition timing of 1e and 1f. AC detection circuits 2a to 2c for detecting a line voltage of each phase AC1, AC2, AC3 of the three-phase AC generator 10 by the phase control unit 100;
Triangular wave generation circuits 4a to 4c for generating a triangular wave from the AC voltage detected by the AC detection circuit;
Comparator circuits 5a to 5c for comparing the detection result of the battery voltage detecting means with the triangular wave generated by the triangular wave generating circuit;
Firing trigger circuits 3a to 3f that output firing signals to the firing circuits 1a, 1b, 1c, 1d, 1e, and 1f based on the comparison results of the comparator circuits 5a to 5c;
The three-phase AC generator battery charging device according to claim 1, comprising:

Images