JP5658996B2 - Power converter and output voltage control method - Google Patents

Description

  The present invention relates to a power conversion device and an output voltage control method for converting AC power output from a generator into DC power.

2. Description of the Related Art Conventionally, a power conversion device that rectifies AC power output from a generator and converts it into DC power is used, for example, to charge a battery or drive a lamp of a vehicle (see Patent Document 1). .
FIG. 9 shows a configuration of a power converter 100A used for charging a battery and driving a vehicle lamp. Hereinafter, the configuration and operation of the power converter 100A will be briefly described.

  The power converter 100A shown in FIG. 9 converts the AC voltage VA output from the coil 11 of the generator 10 into a DC output voltage Vo, and supplies power to the vehicle body load (battery 200 and a load RL such as a lamp). It comprises a thyristor 101, a gate control unit 120A, and resistors R1 and R2. In order to detect the output voltage Vo supplied from the generator 10 to the battery 200 and the load RL via the thyristor 101, a resistor R1 and a resistor R2 are connected in series between the cathode of the thyristor 101 and the ground. Yes. A voltage VR obtained by dividing the output voltage Vo by the resistors R1 and R2 appears at a connection point P between the resistors R1 and R2.

  FIG. 10 shows the configuration of the gate control unit 120A. The gate control unit 120A controls the start of the conduction state of the thyristor 101, and includes a voltage conversion circuit 121, a reference voltage generation circuit 122, a differential circuit 123, an amplification circuit 124, a triangular wave generation circuit 125, and a comparison circuit 126. Is done. Here, the voltage conversion circuit 121 converts the voltage VR appearing at the connection point P into a voltage VR ′ representing the effective value thereof. This voltage VR 'is used as a detected value of the output voltage Vo.

  The reference voltage generation circuit 122 generates a target voltage VT for supplying power to the battery 200 and the load RL. The differential circuit 123 generates a differential voltage VD (= VR′−VT) between the voltage VR ′ and the target voltage VT. The amplifier circuit 124 outputs a differential voltage VD ′ obtained by amplifying the differential voltage VD. The triangular wave generation circuit 125 generates a triangular wave voltage VB corresponding to each cycle of the AC voltage VA output from the coil 11 of the generator.

FIG. 11 is a diagram for explaining the operation of the power conversion apparatus 100A, showing the passage of time in the horizontal direction, the AC voltage VA, the output voltage Vo, the triangular wave voltage VB, the differential voltage VD ′, and the gate in the vertical direction. Each of the pulse signals VSCR is shown side by side.
As shown in this figure, the triangular wave voltage VB corresponds to the positive-phase cycle period of the AC voltage VA, increases from 0 V with a constant slope starting from the time when the AC voltage VA changes from a negative voltage to a positive voltage, When the voltage VA changes from a positive voltage to a negative voltage, it has a waveform that becomes 0 V after the peak voltage VBP is reached. The peak voltage VBP of the triangular wave voltage VB in each cycle period is constant. The comparison circuit 126 compares the differential voltage VD ′ with the triangular wave voltage VB, and generates a pulse signal VSCR that defines the conduction timing of the thyristor 101 based on the comparison result. Specifically, the pulse signal VSCR is set to the high level in the section where the triangular wave voltage VB is larger than the voltage VD ′ (VB> VD ′), and the pulse signal VSCR is set to the low level in the section where the triangular wave voltage VB is less than the voltage VD ′. Level. Then, the comparison circuit 126 supplies the pulse signal VSCR to the gate electrode of the thyristor 101.

  The thyristor 101 is turned on when the supplied pulse signal VSCR becomes high level. Thereafter, when the supplied pulse signal VSCR becomes low level and the AC voltage VA shifts to a negative voltage, the thyristor 101 is turned into a reverse bias state and turned off. As described above, the gate control unit 120A controls the conduction state of the thyristor 101 based on the triangular wave voltage VB generated by the triangular wave generation circuit 125 and the differential voltage VD ′ output from the amplifier circuit 124, thereby converting the power. Control is performed so that the output voltage Vo (effective value) of the apparatus 100A matches the target voltage VT.

Inter-disciplinary 2007/102601 pamphlet

  By the way, in the power conversion device 100A shown in FIG. 9, when the power conversion device 100A is connected to the rotating generator 10 and started up, the output voltage Vo (effective value) increases at a stroke when the control of the power conversion device 100A starts. May cause overshoot.

  FIG. 12 is a diagram showing a specific example of such a situation. The example shown in FIG. 12 is an example when the power converter 100A is connected to the generator 10 at the timing of time t1 after the generator 10 is started, and the power converter 100A is started. As shown in the figure, since the differential voltage VD ′ (= VR′−VT) is small at the start of control of the power conversion apparatus 100A, the period during which the pulse signal VSCR is at the high level (ON) becomes long. As a result, the time (charge time) during which the AC voltage VA is supplied to the battery 200 becomes longer. Although the output voltage Vo rises when the AC voltage VA is supplied to the battery 200, the charging time is long, and the control response delay in the gate control unit 120A (control for making the output voltage Vo coincide with the target voltage VT). The output voltage Vo increases at a stroke due to a delay, and the output voltage Vo may become too large as shown in the figure.

  In FIG. 12, the amplitude of the AC voltage VA is changed, which indicates that the output of the generator is fluctuating. In general, the output of the generator at the start often fluctuates as shown in FIG. Further, the waveform is distorted, indicating that the output of the generator is in the clamped state when the thyristor 101 is in the on state.

  As for this overshoot, as shown in FIG. 13A, when the rotational speed of the generator 10 is high, that is, when the output voltage and frequency of the generator 10 are high, the power converter 100A is connected to the generator 10. When the is connected suddenly, a large overshoot occurs in the output voltage Vo. Thereafter, the output voltage Vo (effective value voltage) is controlled so as to gradually become the target voltage VT as time elapses. As shown in FIG. 13B, when the rotational speed of the generator 10 is low, that is, when the output voltage and frequency of the generator 10 are low, the power converter 100A is suddenly connected to the generator 10. However, overshoot does not occur.

  As described above, when the power converter 100A is suddenly connected to the output side of the generator 10 in a state where the generator 10 is rotating at high speed, the output voltage of the power converter 100A is controlled to the predetermined target voltage VT. There is a problem in that overshoot occurs in the output voltage Vo of the power conversion device 100A due to a delay in control response before the state is reached. For this reason, for example, when the load is a lamp load, the lamp voltage becomes high before the control is started so that the output voltage Vo matches the target voltage VT, and the light emitting element of the lamp may be disconnected. It was. Further, in a high-output generator, a large rush current (inrush current) flows on the load side during high rotation, so that it is necessary to increase the current capacity of a switching element (for example, a thyristor) of the power converter.

  The present invention has been made in view of such circumstances, and an object of the present invention is to overshoot the output voltage of the power converter when the power converter is connected to a rotating generator and started up. An object of the present invention is to provide a power conversion device and an output voltage control method capable of avoiding occurrence.

The present invention has been made to solve the above problems, and a power converter according to the present invention includes an AC voltage output from a generator as an input, and a rectifier and phase control of the AC voltage to include a battery. a power conversion device for supplying a voltage to a load, and which is connected between the output of the generator load, the AC voltage rectifier and phase control that to supply voltage to the load switch unit A control unit that controls the voltage supplied to the load so as to coincide with a predetermined target voltage, and the control unit has a constant peak voltage corresponding to each cycle of the AC voltage output from the generator A triangular wave generating circuit that generates a triangular wave voltage, a voltage conversion circuit that detects an effective value of the voltage supplied to the load and generates a signal of the effective value voltage, and a difference between the effective value voltage and a predetermined target voltage Based on voltage A differential amplifier circuit for generating a first voltage signal for controlling the conduction state of the switch unit so that the voltage supplied to the load coincides with the predetermined target voltage, and the apparatus is activated to start control. In addition, a signal having a predetermined time constant from a predetermined initial voltage and a voltage level gradually decreasing as time elapses, and the voltage supplied to the load gradually increases as the voltage of the signal decreases. A limit voltage generation circuit that generates a second voltage signal that is controlled to be increased, and the first voltage signal and the second voltage signal are compared when the device is activated; One of the voltage signals is selected based on the magnitude relationship between the voltage signal and the second voltage signal, the selected signal is compared with the triangular wave voltage, and the selected signal and the triangular wave voltage are compared. Intersection timing Determined, and wherein the comparison circuit for controlling the conducting state of the switch unit by the timing, that Ru comprising a.

Further, in the power conversion device of the present invention, the limit voltage generation circuit is connected to the output of the generator, the generator starts power generation, starts charging the capacitor, and the device is activated. Then, the voltage charged in the capacitor is discharged, and the second voltage signal in which the voltage gradually decreases is generated .

  In the power conversion device of the present invention, the comparison circuit compares the signal levels of the first voltage signal and the second voltage signal, selects a signal having a higher signal level, and selects the selected signal. And the triangular wave voltage are compared to obtain a crossing timing, and a signal for controlling the conduction state of the switch unit is generated based on this timing.

  In the power conversion device of the present invention, the initial value of the second voltage signal is set to be larger than the first voltage signal when the device is activated, and further, the predetermined time The constant is set so that overshoot does not occur in the voltage supplied to the load when the device is started.

  Further, in the power converter of the present invention, the AC voltage is a single-phase AC voltage, and either the positive phase or the negative phase half wave of the AC voltage is rectified and phase-controlled by the switch unit, and the load A DC voltage is applied to the capacitor.

  In the power conversion device of the present invention, the switch unit is a thyristor element, and the comparison circuit outputs a pulse signal for controlling the ignition timing of the thyristor.

Further, the output voltage control method of the present invention is the power conversion method in which the AC voltage output from the generator is input, the AC voltage is rectified and phase-controlled, and the voltage is supplied to the load including the battery. A step of supplying a voltage to the load by rectifying and phase-controlling the AC voltage output from the generator via a switch unit connected between the output unit and the load; and supplying the load to the load A control procedure for controlling the voltage to be matched with a predetermined target voltage, and the control procedure further includes a triangular wave having a constant peak voltage corresponding to each cycle of the AC voltage output from the generator. A triangular wave generating procedure for generating a voltage, a voltage conversion procedure for detecting an effective value of the voltage supplied to the load and generating a signal of the effective value voltage, and a differential voltage between the effective value voltage and a predetermined target voltage Based on A differential amplification procedure for generating a first voltage signal for controlling the conduction state of the switch unit so that the voltage supplied to the load matches the predetermined target voltage; A signal whose voltage level gradually decreases with the passage of time with a predetermined time constant from a predetermined initial voltage, and a voltage supplied to the load as the voltage of the signal decreases. A limit voltage generation procedure for generating a second voltage signal that is controlled to be gradually increased, and the first voltage signal and the second voltage signal are compared when the device is activated, and the first voltage signal is compared. One voltage signal is selected based on the magnitude relationship between the voltage signal and the second voltage signal, the selected signal is compared with the triangular wave voltage, and the selected signal and the triangular wave voltage are compared. Thailand crossing Seek ring, characterized in that it comprises a comparison step of controlling the conduction state of the switch unit by the timing.

In the power conversion device of the present invention, the first voltage signal for controlling the voltage supplied to the load to match the predetermined target voltage and the second for controlling the voltage supplied to the load to gradually increase. The voltage signal is generated. And when connecting and starting the power conversion device to the rotating generator, first, the output voltage is controlled to be gradually increased by the second voltage signal, and after the output voltage rises to some extent, The output voltage is controlled by the first voltage signal so as to match the target voltage.
Thereby, when connecting and starting an electric power converter with the rotating generator, it can avoid that an overshoot generate | occur | produces in the output voltage of an electric power converter.

It is a figure which shows the structure of the power converter device concerning embodiment of this invention. It is a block diagram which shows the structure of the gate control part 120 shown in FIG. It is a wave form diagram for demonstrating operation | movement of the power converter device shown in FIG. It is a wave form diagram for demonstrating the generation mechanism (square wave production | generation process) of the triangular wave in a triangular wave generation circuit. It is a wave form diagram for demonstrating the generation mechanism (generation process of a slope part) of the triangular wave in a triangular wave generation circuit. It is a figure for demonstrating the magnification factor M in an amplifier circuit. It is a figure which shows the example of CR circuit which produces | generates the limit voltage VL. It is a wave form chart for explaining operation at the time of starting when a power converter is connected to a dynamo under rotation. It is a figure which shows the structure of the conventional power converter device. It is a block diagram which shows the structure of 120 A of gate control parts shown in FIG. It is a figure for demonstrating operation | movement of the power converter device shown in FIG. It is a wave form diagram which shows the example of the overshoot in a power converter device. It is a figure for demonstrating the rotation speed of a generator, and the overshoot in a power converter device.

  In FIG. 1, the structural example of the power converter device 100 which concerns on this embodiment is shown. In FIG. 1, elements common to the components of the power conversion device 100 </ b> A shown in FIG. 9 are given the same reference numerals.

<Overview>
Before describing the detailed configuration and operation of the power conversion device 100 shown in FIG. 1, an overview of the overshoot suppression operation, which is a characteristic part of the present invention, will be described.
In the power conversion device 100 of the present invention, as will be described later, the gate control unit 120 limits the output voltage Vo so that the output voltage Vo does not rise suddenly when it is suddenly connected to the rotating generator 10. The voltage VL is introduced. As shown in FIG. 8, the limit voltage VL is a signal that gradually decreases with the passage of time from the initial value (voltage Vz in the example in the figure) and eventually becomes zero.

  The gate control unit 120 compares the limit voltage VL and the differential voltage VD ′ (control signal for matching the output voltage Vo with the target voltage VT), and the limit voltage VL is higher than the differential voltage VD ′ (voltage level). Is high), that is, in the period from time t1 to time t3, at a timing when the triangular wave voltage VB and the limit voltage VL intersect, and in a section where the limit voltage VL is larger than the triangular wave voltage VB (VL> VD ′) The pulse signal VSCR is set to high level (the thyristor 101 is turned on). In other sections, the level is low.

  In this way, at the start of control of the power conversion device 100, first, the width of the pulse signal VSCR is narrowed (the conduction period of the thyristor 101 is shortened) and gradually widened with time (the conduction period of the thyristor 101 is increased). Widen). Thereby, the output voltage Vo can be slowly raised from the low voltage to the target voltage VT when the control of the power conversion apparatus 100 is started. For this reason, it is possible to avoid the occurrence of an overshoot in the output voltage Vo when the control of the power conversion apparatus 100 is started.

<Description of overall configuration of power conversion device>
First, with reference to FIG. 1, the example of the whole structure of the power converter device 100 in this embodiment is demonstrated.
As shown in FIG. 1, the power conversion apparatus 100 rectifies and phase-controls the AC voltage VA output from the generator coil 11 to convert it into a DC output voltage Vo, and loads (battery 200 and load RL). To supply power. The power conversion apparatus 100 includes a thyristor 101, a gate control unit 120, and resistors R1 and R2. Here, the thyristor 101 is connected between the output unit of the generator 10 and the battery 200. Specifically, the anode of the thyristor 101 is connected to one end of the coil 11 of the generator 10, and the cathode is connected to the positive side of the battery 200 and one end of the load RL. The negative side of the battery 200 and the other end of the load RL are connected to the ground G.

Further, in order to detect the output voltage Vo supplied to the battery 200 and the load RL via the thyristor 101, a resistor R1 and a resistor R2 are connected in series between the cathode of the thyristor 101 and the ground G. A voltage VR obtained by dividing the output voltage Vo by the resistor R1 and the resistor R2 appears at a connection point P between the resistor R1 and the resistor R2. An input part of the gate controller 120 is connected to the connection point P, and an output part of the gate controller 120 is connected to the gate electrode of the thyristor 101.
In the above configuration, the power conversion device 100 is configured to avoid the occurrence of overshoot in the output voltage Vo when it is suddenly connected to the output side of the rotating generator 10.

<Description of Configuration of Gate Control Unit 120>
Next, the overall configuration of the gate control unit 120 will be described with reference to FIG.
FIG. 2 is a diagram illustrating a configuration example of the gate control unit 120. As shown in FIG. 2, the gate control unit 120 includes a voltage conversion circuit 121, a reference voltage generation circuit 122, a differential circuit 123, an amplification circuit 124, a triangular wave generation circuit 125, a comparison circuit 126, a start circuit 131, and a limit voltage. A generation circuit 132 is included.

  Here, the voltage conversion circuit 121 converts the voltage VR appearing at the connection point P into an effective value voltage VR ′ representing its effective value, and the input point is connected to the connection point P. The output part is connected to one input part of the differential circuit 123. The effective value voltage VR ′ corresponds to the output voltage Vo supplied to the battery 200 and the load RL, and is treated as a detected value of the output voltage Vo.

  The reference voltage generation circuit 122 generates a target voltage VT for charging the battery 200 (and supplying power to the load RL), and its output is connected to the other input of the differential circuit 123. The differential circuit 123 generates a differential voltage VD (= VR′−VT) between the effective value voltage VR ′ and the target voltage VT, and an output section thereof is connected to an input section of the amplifier circuit 124.

The amplification circuit 124 multiplies the differential voltage VD by a magnification factor (amplification degree) M (> 0) and outputs a differential voltage VD ′ obtained by amplifying the differential voltage VD by a factor of M. The second input unit b of the comparison circuit 126 is connected.
The triangular wave generation circuit 125 generates a triangular wave voltage VB corresponding to each cycle of the AC voltage VA output from the coil 11 of the generator, and outputs the generated triangular wave voltage VB to the comparison circuit 126. Further, in the triangular wave generation circuit 126, an output unit that outputs a triangular wave voltage VB is connected to the first input unit a of the comparison circuit 126. In the present embodiment, the triangular wave voltage VB corresponds to the positive phase cycle period of the AC voltage VA, as shown by the triangular wave voltage VB in FIG. 3, and starts from the time when the AC voltage VA changes from a negative voltage to a positive voltage. From a positive voltage to a negative voltage, the peak voltage VBP is reached, and immediately after the peak voltage VBP is reached, the waveform becomes 0V. The peak voltage VBP of the triangular wave voltage VB in each cycle period is constant. The generation mechanism of this triangular wave voltage VB will be described later.

  The start circuit 131 is connected to the input unit of the limit voltage generation circuit 132. The start circuit 131 monitors the AC voltage VA input to the triangular wave generation circuit 125, and causes the limit voltage generation circuit 132 to generate the limit voltage VL at the timing when the input of the AC voltage VA is started. The start signal ST is output. The limit voltage generation circuit 132 starts outputting the limit voltage VL when the start signal ST is input.

  The limit voltage generation circuit 132 is, for example, a CR circuit as shown in FIG. 7A (charging a capacitor C11 described later using a resistor R11 and discharging the charge accumulated in the capacitor C11 using a resistor R12. CR circuit). In the CR circuit, a diode D11, a resistor R11, a switch SW11, and a capacitor C11 are connected in series in this order between the anode of the thyristor 101 and the ground G. In this series circuit, the diode D11 is forward-connected from the anode toward the ground G. That is, the diode D11 has an anode connected to the anode of the thyristor 101 and a cathode connected to the connection point Q (break contact b of the switch SW11). Further, a Zener diode ZD11 is connected in the reverse direction from the connection point Q of the resistor R11 and the switch 11 toward the ground G. That is, the Zener diode ZD11 has an anode connected to the ground G and grounded, and a cathode connected to the connection point Q. The switch SW11 is a switch having a 1c contact, the common contact c1 is connected to one end (positive side) of the capacitor C11, and the break contact b is connected to the connection point Q. A resistor R12 is connected between the make contact a of the switch SW11 and the ground G. And the signal of limit voltage VL is output from the connection point N of the contact a of switch SW11, and resistance R12.

  In the configuration of the CR circuit, the switch SW11 is a switch driven by a start signal ST input from the start circuit 131, and is in an OFF state in an initial state (a state where the common contact c1 and the break contact b are connected). When the AC voltage VA is applied to the power conversion device 100, the capacitor C11 is immediately charged (charge is accumulated) by the AC voltage VA through the diode D11 and the resistor R11. The charging voltage of the capacitor C11 is a voltage defined (limited) by the zener voltage Vz of the zener diode ZD11, and the charging time constant is defined by the capacitance (capacitance) of the capacitor C11 and the resistor R11. Is done. The charging time constant is determined by setting the resistance value of the resistor R11 to be as short as possible in consideration of the allowable current that can flow through the diode D11 and the Zener diode ZD11, and applying the AC voltage VA. The capacitor C11 is immediately charged to the Zener voltage Vz through D111 and the resistor R11.

Then, when the start signal ST is input from the start circuit 131, the switch SW11 is turned on (a state where the common contact c1 and the contact a are connected), and the limit voltage generation circuit 132 is charged with the charge potential of the capacitor C11 ( The terminal voltage of the capacitor C11, the initial value of which is the zener voltage Vz) is output as the limit voltage VL. The electric charge accumulated in the capacitor C11 is gradually discharged through the resistor R12, that is, the limit voltage VL gradually decreases with a discharge time constant defined by the capacitance of the capacitor C11 and the resistance value of the resistor R12. It will eventually be 0. As described above, the limit voltage generation circuit 132 outputs the voltage at the connection point N (voltage between terminals of the capacitor C11) that gradually decreases due to the discharge from the capacitor C11 through the resistor R12 to the comparison circuit 126 as the limit voltage VL. .
FIG. 7B shows how the potential (limit voltage VL) of the capacitor C11 changes with time. As shown in FIG. 7, the AC voltage is applied to the power converter 100 at time t1. When VA is applied, the potential of the capacitor C11 is immediately charged to the initial value (Zener voltage Vz). When a start signal is input from the start circuit 131 at time t2, the potential of the capacitor C11 ( The limit voltage VL) gradually decreases due to the discharge and eventually becomes zero.

  The comparison circuit 126 receives the differential voltage VD ′ (control signal for controlling the output voltage Vo to match the target voltage VT) input from the amplifier circuit 124 and the limit voltage VL (output voltage Vo) input from the limit voltage generation circuit 132. And a signal having a larger voltage level between the voltage VD ′ and the limit voltage VL is selected, and the selected voltage (differential voltage VD ′ or limit voltage VL) and the triangular wave voltage are selected. Compare VB. For example, when comparing the differential voltage VD 'and the triangular wave voltage VB, the coincidence point between the differential voltage VD' and the triangular wave voltage VB, that is, the timing of the cross point where the differential voltage VD 'and the triangular wave voltage VB intersect is detected. At this timing, the comparison circuit 126 sets the pulse signal VSCR that defines the conduction timing of the thyristor 101 to a high level, and outputs the pulse signal VSCR to the gate electrode of the thyristor 101. The high level of the pulse signal VSCR is maintained in a section where the triangular wave voltage VB is larger than the differential voltage VD ′ (VB> VD ′), and becomes a low level in other sections.

  Similarly, when the limit voltage VL and the triangular wave voltage VB are compared, the coincidence point between the limit voltage VL and the triangular wave voltage VB, that is, the timing of the cross point where the limit voltage VL and the triangular wave voltage VB intersect is detected. At this timing, the comparison circuit 126 sets the pulse signal VSCR that defines the conduction timing of the thyristor 101 to a high level, and outputs the pulse signal VSCR to the gate electrode of the thyristor 101. The high level of the pulse signal VSCR is maintained in a section where the triangular wave voltage VB is larger than the limit voltage VL (VB> VL), and becomes a low level in other sections.

  The thyristor 101 that inputs the pulse signal VSCR to the gate electrode is turned on when the pulse signal VSCR becomes high level. Thereafter, when the pulse signal VSCR becomes a low level and the AC voltage VA shifts to a negative voltage, the thyristor 101 is put in a reverse bias state and turned off. That is, the thyristor 101 is turned on in a section where the triangular wave voltage VB is higher than both the differential voltage VD ′ and the limit voltage VL, and is turned off in other sections. As described above, the gate control unit 120 includes the triangular wave voltage VB generated by the triangular wave generation circuit 125, the differential voltage VD ′ output from the amplification circuit 124, the limit voltage VL output from the limit voltage generation circuit 132, Based on this, the conduction state of the thyristor 101 is controlled.

<Description of Normal Operation of Power Conversion Device 100>
Next, with reference to FIG. 3 to FIG. 6, the normal operation (normal operation) of the power conversion apparatus 100 will be described. Note that, during normal operation, the limit voltage VL is reduced to 0 V. Here, an example in which only the differential voltage VD ′ and the triangular wave voltage VB are compared in the comparison circuit 126 will be described. In addition, the operation | movement at the time of starting when the power converter device 100 is connected to the generator 10 in rotation is mentioned later.

FIG. 3 is a diagram illustrating waveforms of the respective units in the power conversion device 100, showing the passage of time in the horizontal direction, and the AC voltage VA, the triangular wave voltage VB, the differential voltage VD ′, and the pulse signal VSCR in the vertical direction. These are shown side by side.
Hereinafter, a normal operation of the power conversion apparatus 100 will be described with reference to FIG. The differential circuit 123 in the gate controller 120 receives the target voltage VT generated by the reference voltage generation circuit 122 and the voltage VR ′ output from the voltage conversion circuit 121, and generates a differential voltage VD thereof. . The amplifier circuit 124 amplifies the differential voltage VD M times and supplies the voltage VD ′ (= M × VD) to the comparison circuit 126.

  In the comparison circuit 126, since the differential voltage VD ′ is larger than the limit voltage VL, the differential voltage VD ′ is compared with the triangular wave voltage VB, and a pulse signal VSCR that defines the conduction timing of the thyristor 101 is generated based on the comparison result. . Then, the comparison circuit 126 sets the pulse signal VSCR to the high level in a section where the triangular wave voltage VB is higher than the differential voltage VD ′ (VB> VD ′), and a section where the triangular wave voltage VB is lower than the differential voltage VD ′ (VB <VD). '), The pulse signal VSCR is set to a low level, and this pulse signal VSCR is supplied to the gate electrode of the thyristor 101. That is, the thyristor 101 is turned on in a section where the triangular wave voltage VB is higher than the differential voltage VD ′ (VB> VD ′), and is turned off in other sections. As described above, the gate control unit 120 controls the conduction state of the thyristor 101 based on the triangular wave voltage VB generated by the triangular wave generation circuit 125 and the differential voltage VD ′ output from the amplifier circuit 124.

  Here, the period in which the thyristor 101 is on, that is, the period in which the triangular wave voltage VB is higher than the differential voltage VD ′, depends on the level of the differential voltage VD ′. Depends on the level of Vo. Accordingly, when the output voltage Vo is high, the level of the voltage VD ′ is also increased, the period during which the triangular wave voltage VB is higher than the differential voltage VD ′ is reduced, and the period during which the thyristor 101 is turned on is reduced. As a result, the output voltage Vo decreases toward the target voltage VT.

  On the contrary, if the output voltage Vo is low, the level of the differential voltage VD ′ is also low. As a result, the period in which the triangular wave voltage VB is higher than the differential voltage VD ′ increases, and the period in which the thyristor 101 is turned on increases. . As a result, the output voltage Vo increases toward the target voltage VT. Thus, the conduction period of the thyristor 101 is controlled so that the output voltage Vo is stabilized at the target voltage VT in each cycle of the AC voltage VA of the generator.

  The case where the rotational speed of the power generator 10 is low has been described above. However, when the rotational speed of the generator 10 is high, the amplitude of the AC voltage VA output from the generator 10 is as shown in FIG. As the frequency becomes higher and the frequency becomes higher, the rising rate of the triangular wave voltage VB becomes larger, but the other points are the same as the case where the rotational speed of the generator 10 shown in FIG. The gate control of the thyristor 101 is performed so that the effective value of the output voltage Vo is stabilized at the target voltage VT.

Next, the generation mechanism of the triangular wave voltage VB in the triangular wave generation circuit 125 will be described with reference to FIGS.
In general, since the frequency of the AC voltage output from the generator 10 does not change abruptly, it can be considered that the waveform of the previous cycle and the waveform of the current cycle are almost the same. For example, in FIG. 4, if the waveform 2 is the waveform of the current cycle, the half cycle T2 of the waveform 2 is almost the same as the half cycle T1 of the waveform 1 one cycle before.

Using the above characteristics, the triangular wave voltage VB is generated by the following procedure.
(Procedure 1) As shown in FIG. 4, in the cycle of waveform 1, a square wave S is generated from the AC voltage VA output from the generator. The half cycle of the square wave S corresponding to the waveform 1 matches the half cycle T1 of the AC voltage VA in the cycle of the waveform 1.
(Procedure 2) Subsequently, the time of the half cycle T1 of the square wave S is counted.
(Procedure 3) Subsequently, the time t1 (= T1 / n) is obtained by dividing the count of the time of the half cycle T1 by a predetermined resolution n. Here, the resolution n is an amount that defines the smoothness of the slope of the triangular wave voltage VB. The higher the resolution n, the smoother the slope of the triangular wave voltage VB.
(Procedure 4) Subsequently, the peak voltage VBP of the triangular wave voltage VB is divided by a predetermined resolution n to obtain a voltage v1 (= VBP / n).
(Procedure 5) Subsequently, as shown in FIG. 5B, the triangular wave voltage VB is increased by the voltage v1 at the rising timing of waveform 2 in the next cycle (timing to start counting T2). VB is maintained only for the time t1.

(Procedure 6) In the cycle of the same waveform 2, when the time t1 elapses, the triangular wave voltage VB is further increased by the voltage v1, and when this is repeated n times in the whole city, a staircase as shown in FIG. A step-like waveform corresponding to the slope portion of the triangular wave voltage corresponding to the cycle of waveform 2 is obtained. If the value of the resolution n is increased, the stepped waveform becomes smooth and a better triangular wave can be obtained.
With the above procedure, a waveform of a triangular wave voltage corresponding to each cycle of the AC voltage VA and having a constant peak voltage VBP is generated using the waveform of the AC voltage VA one cycle before.

  The triangular wave generation circuit 125 using the above-described triangular wave voltage generation mechanism generates a triangular wave voltage VB for controlling the conduction timing of the thyristor 101 in the power conversion device. And a waveform generation unit. Here, the counter unit counts a half-cycle time (for example, time T1 in the cycle of waveform 1 in FIG. 4) of the AC voltage waveform of the first cycle output from the generator. The division unit divides the number counted by the counter unit by a predetermined resolution n (predetermined value). The waveform generation unit increases by a predetermined voltage v1 every time t1 indicated by the division result of the division unit in the first cycle in the second cycle after the first cycle (for example, the cycle of waveform 2 in FIG. 4). A stepped voltage waveform is generated. This stepped voltage waveform is output as the waveform of the triangular wave voltage VB.

<Technical meaning of introducing the amplifier circuit 124>
Next, the technical meaning of introducing the amplifier circuit 124 will be described with reference to FIG.
FIG. 6A shows a relative relationship between the triangular wave voltage VB and the differential voltage VD ′ (= VD) when the magnification factor M, which is the amplification degree of the amplifier circuit 124, is “1”. In FIG. 6A, a section W1 indicates a period during which the triangular wave voltage VB exceeds the differential voltage VD ′, that is, a period during which the thyristor 101 is controlled to be in the on state. FIG. 6B shows the relative relationship between the triangular wave voltage VB and the differential voltage VD ′ (= 2 × VD) when the magnification coefficient M is set to “2”. As shown in FIG. 6B, when the magnification factor M is set to “2” and the differential voltage VD is amplified twice, the thyristor 101 is turned on as compared with the section W1 shown in FIG. The corresponding fluctuation amount (variation amount of VD ′) of the corresponding section W2 is doubled, and thereby the response amount (sensitivity) of the pulse signal VSCR is doubled with respect to the fluctuation amount of the output voltage Vo.

  As shown in FIG. 6C, the peak voltage of the triangular wave voltage is relatively half (VB / 2) relative to the differential voltage VD ′ (= VD) when the magnification factor M is “1”. It means that the control width VW of the output voltage Vo is halved. Therefore, by introducing the amplifier circuit 124 and amplifying the differential voltage VD by M times, the control width VW of the output voltage Vo is relatively reduced to 1 / M, so that the output voltage Vo can be accurately set to the target voltage. It becomes possible to control to VT.

  Here, between the height H (= peak voltage VP) of the triangular wave voltage VB, the magnification factor M, the target voltage VT, and the control width VW of the output voltage Vo, W is changed from VT to VT + (H / There is a relationship that is a value in the range of M). Therefore, when implementing this power converter, according to the desired control width W and the target voltage VT, the height H and the magnification factor M of the triangular wave voltage VB are appropriately set so as to satisfy the above open relationship. That's fine.

<Description of operation when power conversion device is connected to rotating generator>
Next, an operation when the power conversion device 100 is connected to the output side of the generator 10 during the rotation of the generator 10, that is, an operation at the time of starting the power conversion device 100 will be described.

FIG. 8 is a diagram for explaining an operation at the time of startup when a power conversion device is connected to a rotating generator. In the example shown in FIG. 8, the time t1 is the timing when the power conversion device 100 is connected to the rotating generator 10 as in FIG. Hereinafter, with reference to FIG. 8, the operation at the time of starting the power conversion apparatus 100 will be described.
When the power conversion device 100 is connected to the generator 10 at time t1, the power conversion device 100 is activated and starts a control operation. When the AC voltage VA is input from the generator 10, the start circuit 131 detects this, generates a start signal ST, and outputs it to the limit voltage generation circuit 132. The limit voltage generation circuit 132 starts the output operation of the limit voltage VL when the start signal ST is input from the start circuit 131.

The limit voltage VL output from the limit voltage generation circuit 132 is generated by, for example, the CR circuit illustrated in FIG. This limit voltage VL is a signal that gradually decreases from the initial value Vz at the time of activation (time t1) and eventually becomes zero. On the other hand, regarding the differential voltage VD ′ (= M × (VR′−VT)), power is not yet supplied to the battery 200 and the load RL immediately after the start-up, so the output voltage Vo (the voltage of the battery 200) and the voltage VR Since '(the detected value of the output voltage Vo) is lower than the target voltage VT, the differential voltage VD' takes a negative value. Therefore, the limit voltage VL is larger than the differential voltage VD ′, and the comparison circuit 126 selects the limit voltage VL and compares the limit voltage VL with the triangular wave voltage VB.
Then, the pulse signal VSCR is set to the high level (the thyristor 101 is turned on) in the section (VB> VL) in which the triangular wave voltage VB is larger than the limit voltage VL. Since the limit voltage VL is the initial value Vz and the voltage level is high immediately after the start-up, the section in which the triangular wave voltage VB is larger than the limit voltage VL (period in which the pulse signal VSCR is at a high level) is short, and the output voltage Vo And the differential voltage VD ′ also rises only slightly.

Thereafter, as the voltage value of the limit voltage VL decreases with the passage of time, a section in which the triangular wave voltage VB becomes larger than the limit voltage VL (a section in which the pulse signal VSCR becomes high level) gradually increases. Then, the differential voltage VD ′ turns to a positive value at time t2, but the limit voltage VL is selected because the limit voltage VL is larger than the differential voltage VD ′ at time t2.
As time elapses further from time t2 and the limit voltage VL further decreases and the output voltage Vo and the differential voltage VD ′ further increase, the differential voltage VD ′ eventually becomes larger than the limit voltage VL at time t3. . After this time t3, the limit voltage VL further decreases, so the differential voltage VD ′ is always greater than the limit voltage VL. Therefore, after time t3, the comparison circuit 126 selects the differential voltage VD ′, and generates the pulse signal VSCR by comparing the differential voltage VD ′ with the triangular wave voltage VB. Therefore, after time t3, the power conversion apparatus 100 shifts to a normal control operation in which the output voltage Vo is matched with the target voltage VT using the differential voltage VD ′.

  As described above, the comparison circuit 126 selects the limit voltage VL from time t1 to time t3, compares the limit voltage VL with the triangular wave voltage VB, and generates the pulse signal VSCR. Since this limit voltage VL is a signal whose voltage level is initially high and gradually decreases, initially, the period during which the pulse signal VSCR is at a high level is short, and the pulse signal VSCR is at a high level as the limit voltage VL decreases. The period to become longer. That is, the limit voltage VL decreases with the passage of time, and the output voltage Vo gradually increases accordingly.

  As described above, in the power conversion device 100, when the power converter 10 is started by being connected to the rotating generator 10, the method of increasing the output voltage Vo can be controlled by the limit voltage VL. For this reason, it can be avoided that the output voltage Vo rises at once and an overshoot occurs. Further, by controlling the initial value and time constant of the limit voltage VL (for example, the discharge time constant in the CR circuit shown in FIG. 7), the output voltage Vo can be appropriately increased.

The embodiment of the present invention has been described above. Here, the correspondence between the present invention and the above embodiment will be supplementarily described.
In the said embodiment, the power converter device in this invention respond | corresponds to the power converter device 100, the generator in this invention respond | corresponds to the generator 10, and the thyristor 101 corresponds to the switch part in this invention. Further, the gate controller 120 corresponds to the controller in the present invention. In addition, the voltage conversion circuit in the present invention corresponds to the voltage conversion circuit 121, the reference voltage generation circuit in the present invention corresponds to the reference voltage generation circuit 122, and the differential amplifier circuit in the present invention includes the differential circuit 123 and The triangular wave generating circuit in the present invention corresponds to the amplifying circuit 124. The comparison circuit in the present invention corresponds to the comparison circuit 126, the start circuit in the present invention corresponds to the start circuit 131, and the limit voltage generation circuit in the present invention corresponds to the limit voltage generation circuit 132.
The voltage supplied to the load in the present invention corresponds to the output voltage Vo, the first voltage signal in the present invention corresponds to the differential voltage VD ′, and the second voltage signal in the present invention represents the limit voltage. The initial voltage in the present invention corresponds to the Zener voltage Vz. The target voltage in the present invention corresponds to the target voltage VT, and the initial voltage of the second voltage signal in the present invention corresponds to the Zener voltage Vz.

  (1) In the above embodiment, the power conversion apparatus 100 receives the AC voltage VA output from the generator 10 as an input, rectifies and phase-controls the AC voltage VA, and includes a load (battery 200 and load). RL), the thyristor 101 connected between the output section of the generator 10 and the load, and the output voltage Vo supplied to the load to a predetermined target voltage VT. A gate control unit 120 that controls the signal so as to coincide with the output voltage Vo supplied to the load (battery 200 and load RL) and a signal of a differential voltage between the predetermined target voltage VT. And generating a first voltage signal (differential voltage VD ′) for controlling the output voltage Vo supplied to the load to match a predetermined target voltage VT, When the device 100 is started, a signal whose voltage gradually decreases with time from a predetermined initial voltage (Zener voltage Vz), and the output voltage supplied to the load as the voltage of the signal decreases A second voltage signal (limit voltage VL) that is controlled to gradually increase Vo is generated, and the first voltage signal (differential voltage VD ′) and the second voltage signal ( One of the voltage signals is selected based on the magnitude relationship with the limit voltage VL), and the conduction state of the thyristor 101 is controlled based on the selected voltage signal.

In the power conversion device 100 having such a configuration, the first voltage signal (differential voltage VD ′) for controlling the output voltage Vo supplied to the load (battery 200 and load RL) to coincide with a predetermined target voltage VT. Is generated. In addition, the device 100 is activated and control is started, and a second voltage signal (limit voltage VL) whose voltage level gradually decreases with time from the initial voltage (zener voltage Vz) is generated. And when connecting the power converter device 100 to the generator 10 in rotation and starting the said apparatus 100, a 2nd voltage signal (limit voltage VL) is first selected and this 2nd voltage signal As the (limit voltage VL) gradually decreases, the output voltage Vo is controlled to gradually increase from an initial value (for example, the initial voltage of the battery 200). Then, when the output voltage Vo rises to some extent (approaching the target voltage VT) and the first voltage signal (difference voltage VD ′) becomes larger than the second voltage signal (limit voltage VL), The first voltage signal (differential voltage VD ′) is selected, and the output voltage Vo is controlled to match the target voltage VT by the first voltage signal (differential voltage VD ′).
Thereby, when connecting and starting the power converter device 100 in the rotating generator 10, it can avoid that an overshoot generate | occur | produces in the output voltage Vo of the power converter device 100. FIG.

  (2) Moreover, in the said embodiment, the power converter device 100 is connected between the output part of the generator 10, and load (battery 200 and load RL), rectifies and phase-controls the alternating voltage VA. A thyristor 101 that supplies an output voltage Vo to the load, a triangular wave generation circuit 125 that generates a triangular wave voltage VB having a constant peak voltage corresponding to each cycle of the AC voltage VA output from the generator 10, and an output supplied to the load Based on the voltage conversion circuit 121 that detects the effective value of the voltage Vo and generates a signal of the effective value voltage VR ′, and the differential voltage VD between the effective value voltage VR ′ and a predetermined target voltage VT, the conduction state of the thyristor 101 is determined. A differential amplifier circuit (differential circuit 123 and amplifier circuit 124) that generates a first voltage signal (differential voltage VD ′) for control, and the apparatus 100 is activated and starts control. A limit voltage generating circuit 132 for generating a second voltage signal (limit voltage VL) whose voltage level gradually decreases with a predetermined time constant from a predetermined initial voltage (Zener voltage Vz), and a first voltage signal (Difference voltage VD ′) and the second voltage signal (limit voltage VL) are compared, one of the signals is selected according to the magnitude relationship, and based on the comparison result between the selected signal and the triangular wave voltage VB And a comparison circuit 126 for controlling the conduction state of the thyristor 101.

  In the power conversion device 100 having such a configuration, as shown in FIG. 8, the triangular wave generation circuit 125 generates a triangular wave voltage VB with the same phase as the AC voltage VA and a constant peak value. The voltage conversion circuit 121 generates a signal of an effective value voltage VR ′ of the output voltage Vo, and the differential circuit 123 and the amplifier circuit 124 generate a differential voltage VD ′ (=) between the effective value voltage VR ′ and the target voltage VT. M × (VR′−VT)) signal is generated as the first voltage signal (differential voltage VD ′). Further, the limit voltage generation circuit 132 generates a second voltage signal (limit voltage VL) for controlling an increase in the output voltage Vo. This limit voltage VL is a signal whose level gradually decreases with the passage of time from the initial value (zener voltage Vz) when control is started, and eventually becomes zero.

  The comparison circuit 126 compares the limit voltage VL and the difference voltage VD ′, and the limit voltage VL has a higher voltage level than the difference voltage VD ′ (VL> VD ′), that is, from time t1 to time t3. In this period, the pulse signal VSCR is set to the high level (the thyristor 101 is turned on) at the timing when the triangular wave voltage VB and the limit voltage VL cross each other and in the section where the limit voltage VL is larger than the triangular wave voltage VB (VB> VL). To do. In other sections, the level is low. In this way, when the control of the power converter 100 is started, first, the width of the pulse signal VSCR is narrowed (the conduction period of the thyristor 101 is shortened), and is gradually increased with the passage of time (the conduction period of the thyristor 101). The output voltage Vo is gradually increased.

  Thereby, when connecting and starting the power converter device 100 to the rotating generator 10, the output voltage Vo can be gently raised from the low voltage to the target voltage VT. That is, it is possible to avoid the occurrence of overshoot in the output voltage Vo when the power conversion apparatus 100 is activated and starts control. For this reason, for example, it can suppress that the high voltage by an overshoot is applied to a lamp | ramp (lamp for illumination), and generation | occurrence | production of the lamp breakage by high voltage application can be suppressed. Also, by setting the initial value (Zener voltage Vz) of the limit voltage VL and the time (time constant) during which the voltage level decreases, the method of increasing the output voltage Vo (for example, the rising time) is controlled. Can do. Furthermore, it is possible to prevent a large rush current (inrush current) from flowing from the generator 10 to the load side when the power conversion device 100 is activated.

(3) In the above-described embodiment, the comparison circuit 126 compares the signal levels of the first voltage signal (difference voltage VD ′) and the second voltage signal (limit voltage VL), and the higher signal level is compared. A signal is selected, and the selected signal is compared with the triangular wave voltage VB to obtain a crossing timing. Based on this timing, a signal for controlling the conduction state of the thyristor 101 is generated.
In the power conversion device having such a configuration, the comparison circuit 126 compares the limit voltage VL and the differential voltage VD ′, selects a signal having a higher signal level, and compares it with the triangular wave voltage VB. For example, since the second voltage signal (limit voltage VL) is larger than the first voltage signal (difference voltage VD ′) when the power conversion apparatus 100 is activated, the comparison circuit 126 uses the second voltage signal ( The limit voltage VL) is selected and compared with the triangular wave voltage VB. Then, the pulse signal VSCR is set to the high level (thyristor) at the timing when the triangular wave voltage VB and the second voltage signal (limit voltage VL) intersect, and in the section where the limit voltage VL is larger than the triangular wave voltage VB (VB> VL). 101 is conductive). In other sections, the level is low. In this way, when the control of the power converter 100 is started, first, the width of the pulse signal VSCR is narrowed (the conduction period of the thyristor 101 is shortened), and is gradually increased with the passage of time (the conduction period of the thyristor 101). The output voltage Vo can be gradually increased.
Thereby, when connecting and starting the power converter device 100 to the rotating generator 10, the output voltage Vo can be slowly raised from the low voltage to the target voltage VT. That is, it is possible to avoid the occurrence of overshoot in the output voltage Vo when the control of the power conversion apparatus 100 is started.

(4) In the above embodiment, the initial value (zener voltage Vz) of the second voltage signal (limit voltage VL) is the first voltage signal (difference voltage VD ′) when the device 100 is activated. The time constant (the time constant that gradually decreases the voltage level of the second voltage signal (limit voltage VL)) is supplied to the load when the device 100 is started up. The output voltage Vo is set so as not to overshoot.
Thus, when the power conversion device 100 is connected to the rotating generator 10 and started, the method of increasing the output voltage Vo (for example, the rising time) by the second voltage signal (limit voltage VL) Can be controlled. For this reason, it is possible to avoid the occurrence of overshoot in the output voltage Vo of the power conversion device 100.

(5) In the above embodiment, the AC voltage VA is a single-phase AC voltage, and either the positive phase or the negative phase half-wave of the AC voltage VA is rectified and phase-controlled by the thyristor 101 to be DC to the load. Apply voltage.
As a result, when the power conversion device 100 is connected to a single-phase generator (rotating generator) mounted on a vehicle (for example, a two-wheeled vehicle), an overshoot occurs in the output voltage Vo of the power conversion device 100. It can be avoided.

(6) Moreover, in the said embodiment, the power converter device 100 is comprised using the thyristor 101, and the comparison circuit 126 outputs the pulse signal VCSR which controls the ignition timing of the thyristor 101. FIG.
Thereby, in the power converter 100 using the thyristor 101, when the power converter 100 is connected to the rotating generator 10 and started up, it is possible to avoid the occurrence of overshoot in the output voltage Vo.

  As mentioned above, although embodiment of this invention was described, the power converter device of this invention is not limited only to the above-mentioned example of illustration, A various change can be added in the range which does not deviate from the summary of this invention. Of course.

  For example, in the embodiment shown in FIG. 1, only the positive phase component of the AC power output from the generator is supplied to the load via the thyristor 101, and the case where the output of the generator is half-wave rectified is described. However, the present invention is not limited to this, and a full-wave rectification may be performed by half-wave rectifying the negative phase component of the AC power output from the generator in the same manner. In the embodiment shown in FIG. 1, single-phase AC power is converted. However, the present invention can also be applied to multi-phase AC power.

  For example, in the embodiment shown in FIG. 1, the example in which the effective value of the output voltage Vo is obtained in the voltage conversion circuit 121 has been described. However, the present invention is similarly applied to the case where the average value of the output voltage Vo is calculated. It can be done. A known technique can be used as a configuration for generating an average value of the output voltage Vo.

DESCRIPTION OF SYMBOLS 10 Generator 11 Coil 100,100A Power converter 101 Thyristor 120,120A Gate control part 121 Voltage conversion circuit 122 Reference voltage generation circuit 123 Differential circuit 124 Amplifier circuit 125 Triangle wave generation circuit 126 Comparison circuit 131 Start circuit 132 Limit voltage generation circuit 200 Battery C11 Capacitor D11 Diodes R1, R2, R11, R12 Resistor SW11 Switch VB Triangular wave voltage VD Differential voltage VD ′ Differential voltage (first voltage signal)
VL limit voltage (second voltage signal)
Vo output voltage VR 'RMS voltage (effective value detection voltage)
VSCR Gate pulse signal VT Target voltage Vz Zener voltage ZD11 Zener diode

Claims (7)

An AC converter output from a generator is used as an input, and the AC converter supplies a voltage to a load including a battery by rectifying and phase controlling the AC voltage,
A switch unit that to supply voltage to the connected, the load the AC voltage rectified and with phase control between the output of the generator load,
A control unit that controls the voltage supplied to the load to match a predetermined target voltage;
With
The control unit is
A triangular wave generating circuit for generating a triangular wave voltage having a constant peak voltage corresponding to each cycle of the AC voltage output from the generator;
A voltage conversion circuit that detects an effective value of the voltage supplied to the load and generates a signal of the effective value voltage; and
Based on a differential voltage between the effective value voltage and a predetermined target voltage, a first voltage signal for controlling the conduction state of the switch unit so that the voltage supplied to the load matches the predetermined target voltage. A differential amplifier circuit for generating
The device is activated and the control is started, and a signal having a predetermined time constant from a predetermined initial voltage and a voltage level gradually decreasing as time elapses, and as the voltage of the signal decreases, A limit voltage generating circuit that generates a second voltage signal that is controlled so as to gradually increase the voltage supplied to the load;
When the device is activated, the first voltage signal and the second voltage signal are compared, and one of the voltages is determined based on the magnitude relationship between the first voltage signal and the second voltage signal. A comparison circuit that selects a signal, compares the selected signal with the triangular wave voltage, finds a timing at which the selected signal and the triangular wave voltage intersect, and controls the conduction state of the switch unit according to the timing When,
Power conversion apparatus characterized by Ru with a. The limit voltage generating circuit is
Connected to the output of the generator, the generator starts power generation, starts charging the capacitor, and when the device is activated, discharges the voltage charged in the capacitor and gradually increases the voltage. Generating the second voltage signal to decrease
The power conversion apparatus according to claim 1. The comparison circuit is
Compare the signal levels of the first voltage signal and the second voltage signal, select the signal with the higher signal level, compare the selected signal with the triangular wave voltage, and determine the timing of crossing, The power conversion device according to claim 1 or 2, wherein a signal for controlling a conduction state of the switch unit is generated based on the timing. The initial value of the second voltage signal is set to be larger than the first voltage signal when the device is activated,
The power according to claim 1 or 2, wherein the predetermined time constant is set so that overshoot does not occur in the voltage supplied to the load when the device is activated. Conversion device. The AC voltage is a single-phase AC voltage, and the DC voltage is applied to the load by rectifying and phase-controlling either the positive phase or the negative phase half wave of the AC voltage by the switch unit. The power conversion device according to claim 1 or 2. The switch part is a thyristor element;
The power converter according to claim 1 , wherein the comparison circuit outputs a pulse signal that controls an ignition timing of the thyristor. In a power conversion method for supplying an AC voltage output from a generator as an input, rectifying and phase-controlling the AC voltage and supplying a voltage to a load including a battery,
A procedure for supplying a voltage to the load by rectifying and phase-controlling the AC voltage output from the generator via a switch unit connected in a connection between the output unit of the generator and the load;
A control procedure for controlling the voltage supplied to the load to match a predetermined target voltage;
Including
Furthermore, the control procedure includes
A triangular wave generation procedure for generating a triangular wave voltage with a constant peak voltage corresponding to each cycle of the AC voltage output from the generator;
A voltage conversion procedure for detecting an effective value of the voltage supplied to the load and generating a signal of the effective value voltage;
Based on a differential voltage between the effective value voltage and a predetermined target voltage, a first voltage signal for controlling the conduction state of the switch unit so that the voltage supplied to the load matches the predetermined target voltage. A differential amplification procedure to generate
The device is activated and the control is started, and a signal having a predetermined time constant from a predetermined initial voltage and a voltage level gradually decreasing as time elapses, and as the voltage of the signal decreases, A limit voltage generation procedure for generating a second voltage signal for controlling the voltage supplied to the load to gradually increase;
When the device is activated, the first voltage signal and the second voltage signal are compared, and one of the voltages is determined based on the magnitude relationship between the first voltage signal and the second voltage signal. A comparison procedure for selecting a signal, comparing the selected signal with the triangular wave voltage, obtaining a timing at which the selected signal and the triangular wave voltage intersect, and controlling the conduction state of the switch unit according to the timing When,
Output voltage control method, which comprises a.

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