JP3303015B2 - Voltage control device for magnet generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage control device for a magnet type generator mounted on a vehicle and charging a battery and supplying power to a load. The present invention relates to a voltage control device for a magnetic generator to be obtained.

[0002]

2. Description of the Related Art Conventionally, when a rectifier bridge circuit using a thyristor is controlled in phase to obtain a constant voltage, a constant-frequency power supply such as a commercial frequency that does not change in frequency is used as a constant-voltage power supply for control. There are many.

A conventional device using a power supply having a constant frequency, for example, as shown in FIG. 6, has a rectangular shape that is turned on while a sine wave forward voltage (Vin) is applied to a thyristor. A rectangular signal generating circuit for outputting a signal as a synchronizing signal (Va) is provided. Then, the rectangular signal is integrated by an integrating circuit, and a saw-tooth signal (integral voltage for synchronizing with the forward voltage of the thyristor) becomes an integrated signal voltage for phase control. Vf). Then, the sawtooth signal (Vf) and the reference voltage (V
c), and a trigger signal (Vg) rising at the intersection P with the reference voltage (Vc) is supplied to the gate of the thyristor;
The phase control is performed by giving the thyristor a control angle.

[0004]

However, the above-mentioned conventional apparatus is modified such that the frequency of the AC output of the generator changes with the rotation speed of the generator, such as a generator driven by an engine of a vehicle. When used, the following problems occur.

That is, as shown in FIG. 7, when the frequency of the AC output of the generator changes twice as in the case of the waveform Vin (1), the integration constant of the integration circuit is constant and therefore the same as in FIG. A sawtooth signal (Vf) having a slope is generated.
Then, the peak value of the wave height of the sawtooth signal (Vf) becomes smaller by the shorter pulse width of the waveform Vin (1),
The peak voltage b becomes smaller than the reference voltage (Vc). Therefore, in this case, since a trigger signal cannot be generated, phase control of the thyristor cannot be performed.

In order to solve this problem, Japanese Utility Model Application Laid-open No.
No. 118890 discloses that the AC output of a generator is
An FV converter for voltage (FV) conversion is provided.
A thyristor rectifier is disclosed in which the output value of a V converter is integrated by an integrating circuit to form a sawtooth signal, thereby changing the slope of the sawtooth signal in proportion to the frequency of the AC output of the generator. However, in this case, since the AC output of the generator needs to take at least several cycles to perform the FV conversion, there is a problem that a response delay corresponding to the several cycles occurs and the responsiveness to a frequency change becomes extremely poor. . In addition, a new FV converter is required, and there is a problem that the circuit configuration becomes complicated.

Japanese Patent Application Laid-Open No. Sho 61-262100 focuses on the fact that the AC output voltage of a magnet type generator is proportional to the number of revolutions of the generator. A voltage control device of a magnet type generator aiming at improving responsiveness to a frequency change is disclosed. However, in this case, since the AC output voltage of the generator does not become a clean sine wave due to conduction of the thyristor, the wave height of the signal waveform obtained by directly integrating the sine wave is not constant. Therefore, there is a problem that the voltage control that follows the frequency change cannot be performed.

[0008] Further, in the voltage control device of the conventional magnet generator including the inventions described in the above two publications, there are the following three problems. The first problem is that the phase control element operates at the same time as the engine starts to rotate, and the generator starts to supply electric power. Therefore, the connected load becomes a power load and prevents the start of the engine. Problem. As a second problem, when the connection terminal of the battery is disconnected, the power of the generator is directly applied to the load, and the electric system load is destroyed by the excessive voltage. As a third problem, when the capacity of the connected load is large, the generator generates a large amount of power before the load is cut off for the control delay time of the generator even after the load is cut off. There is a problem that the voltage and the current temporarily increase suddenly.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a case in which the frequency of the AC output of a magnet-type generator changes with the number of revolutions of the generator. Another object of the present invention is to provide a voltage control device having excellent responsiveness to a frequency change.

It is a further object of the present invention to provide a voltage control device which is excellent in following up a vehicle state such as an engine speed or a load state. That is, specifically, it is an object of the present invention to provide a voltage control device that does not hinder the smooth start of the engine, and that an excessive voltage is generated even when a connection terminal of a battery is disconnected. The object is to provide a voltage control device without the need. It is another object of the present invention to provide a voltage control device in which the output voltage and current of the battery do not temporarily increase suddenly even when a connected large-capacity load is cut off.

[0011]

According to the present invention, there is provided a rectifier bridge circuit comprising a magnet generator, a rectifier for rectifying the output of the magnet generator, and a phase control element. And a battery charged by the output of the rectifier bridge circuit, and compares the battery voltage with a predetermined voltage, and when the battery voltage is higher than a predetermined voltage, charges a capacitor. A charge / discharge circuit for discharging the capacitor when the voltage is lower than the voltage; a reference voltage generating circuit for outputting the voltage of the capacitor as a reference voltage; an AC output voltage of the magnet type generator as an input; and an integrated voltage of the AC output voltage. A phase control circuit that controls the phase control element with the reference voltage to control the phase of the generated voltage of the magnet generator. In the pressure control device, limiting means for limiting the output of the reference voltage generation circuit so that the reference voltage is not input to the phase control circuit, and outputting a predetermined voltage to the phase control circuit instead of the reference voltage And a means for generating an alternative reference voltage.

According to the present invention, the reference voltage control circuit detects the number of revolutions of the magnet type generator from the AC output voltage of the magnet type generator, and the number of revolutions is determined in advance. A voltage control device for the magnet-type generator is provided, which operates the limiting means when the rotation speed is equal to or lower than a reference rotation speed and generates the alternative reference voltage.

Further, according to the present invention, the reference voltage control circuit activates the means for detecting the voltage of the battery, and the limiting means when the battery voltage is not a predetermined reference voltage width. A voltage control device for the magnet generator is provided, wherein the voltage control device generates the alternative reference voltage.

[0014]

In the voltage control apparatus for a magnet generator according to the present invention, the reference voltage generation circuit detects the battery voltage and generates a reference voltage that follows this voltage change. That is, when the battery voltage increases, the reference voltage output increases, and when the battery voltage decreases, the reference voltage output decreases. Since the battery voltage changes depending on the frequency of the AC output signal of the generator, as a result, a reference voltage corresponding to the frequency change of the AC output signal of the generator is supplied from the reference voltage generation circuit.

In the phase control circuit, the reference voltage is compared with a sawtooth signal which is an integral output of the generator output, and a trigger signal determined by an intersection between the reference voltage and the sawtooth signal is supplied to the phase control element. You. That is, when the frequency of the AC output signal of the generator is low, the frequency of the trigger signal is also low, and the time interval until the phase control element is fired is long. Conversely, if the frequency of the AC output signal of the generator is large, the frequency of the trigger signal will also be large, and the time interval until the phase control element will be fired will be short, and the generator will supply optimal power to the battery and load. Become so. In this way, it is possible to perform voltage control with an excellent response to a frequency change of the AC output signal of the generator.

In the voltage control apparatus for a magnetic generator according to the present invention, the reference voltage control circuit supplies the reference voltage from the reference voltage generation circuit to the phase control circuit until the engine speed reaches a predetermined value. , Power is not supplied from the generator to the load immediately after the engine is started. As a result, smooth start of the engine is not hindered.

The reference voltage control circuit of the present invention further monitors the output voltage of the battery, and outputs a constant abnormal voltage signal to the output line of the charge / discharge circuit when the output voltage does not fall within the predetermined reference voltage range. I do. As a result, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit,
Since a constant voltage is input to the comparison circuit, phase control by the phase control circuit is limited. As a result, power is not supplied from the generator to the load. Thus, even when an abnormality such as a disconnection of the battery terminal occurs, it is possible to prevent the power of the generator from being supplied to the load and generating an excessive voltage, thereby preventing the load from being destroyed.

Further, the reference voltage control circuit outputs a constant abnormal voltage signal to an output line of the charge / discharge circuit in response to an off signal of a large-capacity load supplied from the outside. Thereby, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit, a constant voltage is input to the comparison circuit, so that phase control by the phase control circuit is limited, and power of the generator is not supplied to the load. . As a result, even when the connected large-capacity load is turned off, it is possible to prevent the output voltage and current of the battery from temporarily and suddenly increasing.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a voltage control device 100 for a magnet-type generator according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a magnet generator, which induces three-phase AC output at AC output terminals 1a, 1b, and 1c connected to armature windings. Phase control elements 2, 2, 2 composed of three thyristors and rectifiers 3, 3, 3 composed of three diodes are connected to AC output terminals 1a, 1b, 1c of the magnet type generator. A phased generator 4 with full-wave rectifier is formed. The cathodes of the thyristors 2, 2, 2 are commonly connected to the positive terminal of the battery 5, and the anodes of the diodes 3, 3, 3 are commonly connected to the negative terminal of the battery 5. I have. A load 6 is connected to the battery 5. All of the above configurations are well known.

In FIG. 1, reference numeral 7 denotes a phase control circuit, 8 denotes a reference voltage generation circuit, and 9 denotes a reference voltage control circuit. All three phase control circuits 7, 7, 7 have the same configuration, and have AC output terminals 1a, 1b, 1
c, a synchronizing signal generating circuit 10, an integrating circuit 11,
It comprises a comparison circuit 12 and a gate circuit 13. The output of the gate circuit 13 is connected to the gate terminals of the thyristors 2, 2, 2. The reference voltage generating circuit 8 includes a battery 5
And a charge / discharge circuit 15 connected to the plus side terminal of The output of the charge / discharge circuit 15 is connected to one input of the comparison circuit 12 in the phase control circuit 7.

The reference voltage control circuit 9 includes a soft start circuit 16 connected to the output of the synchronizing signal generation circuit 10 and the output of the charge / discharge circuit 15, an output of the battery and a charge / discharge circuit 15
And an external on / off control circuit 1 connected to the output of the charge / discharge circuit 15
It consists of eight. The output of the soft start circuit 16 and the output of the voltage monitoring circuit 17 are connected to an indicator lamp driving circuit 19 for notifying the driver of an abnormality.

Next, the operation of the voltage control device 100 shown in FIG. 1 will be described. FIG. 2 is a diagram showing operation waveforms of each part of the phase control circuit of the voltage control device 100 of FIG. FIG. 2 (a)
Is input to the synchronizing signal generation circuit 10, and the rectangular signal (V) synchronized with the input signal (Vin) is input.
t). The rectangular signal Vt is input to the integration circuit 11, where it is integrated for one pulse time of the rectangular signal (Vt) and output as a sawtooth signal (Vf). Sawtooth signal (V
f) is input to the comparison circuit 12, is compared with the reference voltage Vr supplied from the reference voltage generation circuit 8, and outputs a trigger signal (Vg) which rises at an intersection P with the reference voltage Vr. Finally, the trigger signal (Vg) is input to the gate circuit 13, amplified and shaped into a gate signal having a predetermined peak value, and supplied to the gate terminal of the thyristor 2. The thyristor 2 is controlled in phase by a gate signal.

As shown in FIG. 2B, for example, when the frequency of the AC input signal (Vin ') is doubled, the rectangular signal V output from the synchronization signal generation circuit 10 is output.
The pulse width of t 'halves as the frequency increases. In the integration circuit 11, since the integration constant is constant, the peak value of the saw-tooth signal (Vf ') output as much as the pulse width becomes shorter also becomes smaller. The peak P 'of the sawtooth signal (Vf') is about half of the peak P of the sawtooth signal (Vf) in FIG.
smaller than r. At this time, the reference voltage Vr 'supplied from the reference voltage generation circuit 8 also changes according to a change in the battery voltage, as described later. That is, when the battery voltage becomes lower than a predetermined reference voltage, the reference voltage Vr' also becomes smaller. . Therefore, as in the case of FIG. 2A, a trigger signal (Vg ′) that rises at the intersection P ′ between the sawtooth signal (Vf ′) and the reference voltage Vr ′ is output. The pulse width of this trigger signal (Vg ') is the AC input signal (Vin')
Halving in response to the increase in the frequency of the thyristor 2, the phase can be controlled by reducing the control angle of the thyristor 2 to about half.

Next, the operation of generating the reference voltage in the reference voltage generating circuit 8 will be described. Voltage of battery 5 (V
bt) is input to the voltage detection circuit 14, and the reference voltage (Vr
ef). This reference voltage (Vref) is appropriately varied in the reference voltage circuit. Voltage signal (Vbt)
Is larger than the reference voltage (Vref), the capacitor provided in the charge / discharge circuit 15 is charged. Conversely, when the voltage is smaller than the reference voltage (Vref), the capacitor is discharged.

Then, the voltage signal of the capacitor is input to the comparison circuit 12 in the phase control circuit 7 as a reference voltage (Vr). Therefore, the reference voltage (Vr) changes according to the voltage (Vbt) of the battery 5. That is, when the voltage (Vbt) of the battery 5 is high, the reference voltage (Vr) increases, and when the voltage (Vbt) of the battery 5 is low, the reference voltage (Vr) decreases. The voltage (Vbt) of the battery 5 changes depending on the voltage generated by the magnet generator 1, that is, the voltage of the AC input signal (Vin '), and the voltage generated by the magnet generator 1 depends on the number of revolutions of the generator. As a result, the reference voltage (Vr ') corresponding to the change in the frequency of the AC input signal (Vin') is supplied from the reference voltage generation circuit 8 as shown in FIG. Will be done. Thus, the reference voltage generating circuit of the present invention performs so-called feedback control.

As described above, the output voltage, that is, the voltage of the battery 5 (Vb
When t) is larger than the target voltage, the reference voltage (Vr)
And the phase control angle of the thyristor increases. As a result, the time interval until the thyristor 2 fires becomes longer, and the time until power is supplied to the battery 5 becomes longer. Conversely, when the output voltage of the phase control circuit 7 is lower than the target voltage, the reference voltage (Vr) decreases, and the phase control angle of the thyristor decreases. As a result, the interval until the thyristor 2 fires is shortened, and the time cycle in which power is supplied to the battery 5 is also shortened. That is, more power is supplied from the generator to the battery. By controlling the phase control angle of the thyristor in this way, the output voltage of the generator can be kept constant.

Next, the control operation of the reference voltage in the reference voltage control circuit 9 will be described. Soft start circuit 1
6 receives the output of the synchronization signal generation circuit 10 and monitors the number of revolutions of the generator based on the output. Then, the supply of the reference voltage from the reference voltage generation circuit 8 to the comparison circuit 12 is restricted until the rotation speed of the generator reaches a preset value. That is, the soft start circuit 16 keeps the voltage detection circuit 1 until the rotation speed of the generator reaches a preset value.
4 so that the reference voltage is not supplied from the charge / discharge circuit 15 to the comparison circuit 12 regardless of the magnitude of the output voltage. When the number of revolutions of the generator reaches a preset value, the restriction is released and the reference voltage is supplied from the reference voltage generation circuit 8 via the charge / discharge circuit 15. At this time, before the power is supplied from the generator, the phase control angle of the normal thyristor is minimized because the battery voltage is low. Therefore, when a small reference voltage corresponding to the battery voltage is suddenly supplied from the reference voltage generation circuit 8 to the comparison circuit 12 at the start of the phase control, the output voltage of the generator is not phase-controlled and the maximum power is reduced. As a result, the output current of the generator is maximized, that is, the driving load of the generator is increased, and smooth starting of the engine is prevented.

In order to prevent this, when the number of revolutions of the generator is equal to or less than a preset value, the soft start circuit 16 outputs a large reference voltage instead of the reference voltage generating circuit 8,
The phase control angle of the thyristor is first increased to prevent large power from being supplied from the generator to the load. Then, in response to an increase in the number of revolutions of the generator, the soft start circuit 16 stops its output so that the reference voltage is supplied from the reference voltage generation circuit 8 to the comparison circuit 12. That is, soft phase control is started.

At the same time, the output of the soft start circuit 16 is supplied to an indicator / lamp drive circuit 19, and when there is an abnormality in power transmission from the engine to the generator such as a broken belt, the indicator / lamp is driven. Lights up. By this series of operations, the phase control element operates at the same time as the engine starts to rotate, and the generator starts to supply electric power, and the connected load becomes a power load and hinders the start of the engine. Can be prevented. Further, the driver can know from the lighting of the indicator lamp that there is an abnormality in power transmission from the engine to the generator due to a belt break or the like.

The voltage monitoring circuit 17 monitors the voltage of the battery 5 and outputs a certain abnormal voltage signal to the output line of the charging / discharging circuit 15 when the voltage does not fall within a predetermined reference voltage range. Thus, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit 8, a predetermined control voltage is input to the comparison circuit 12, so that the phase control by the phase control circuit 7 is limited. That is, the power of the generator is not supplied to the load. Note that the predetermined reference voltage width in the voltage monitoring circuit 17 is set based on a voltage output width of the generator that is allowable when the generator and the control circuit system are operating normally. At the same time, the output signal of the voltage monitoring circuit 17 is input to the indicator lamp driving circuit 19, and the indicator lamp driving circuit operates to turn on the indicator lamp. By this series of operations, even when an abnormality such as a disconnection of the battery terminal occurs, it is possible to prevent the power of the generator from being supplied to the load and preventing the load from being destroyed due to excessive voltage being generated. it can. Further, the driver can know an abnormality such as a case where the battery terminal is disconnected by lighting of the indicator lamp.

Next, control of the reference voltage by the external on / off control circuit 18 will be described. When a large-capacity load connected to the generator output line turns off contacts such as relays to stop power supply from the generator, power is output even after the load is cut off due to the time delay of the phase control system. It is supplied from the generator to the load. When the capacity of the load is small, this power supply hardly causes a problem, but when the capacity of the load is large, a temporary jumping phenomenon of the output voltage and the current occurs as shown in FIG. In order to avoid this jumping phenomenon, an external on / off control circuit 1
Reference numeral 8 designates a signal for externally turning off the load before a contact such as a relay is actually turned off, and outputs a constant control voltage signal to the output line of the charge / discharge circuit 15 in response to the off signal.
Thereby, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit 8, a constant voltage is input to the comparison circuit 12, so that the phase control by the phase control circuit 7 is limited. That is, the power of the generator is not supplied to the load. Then, after the power supply from the generator to the load is completely stopped, contacts such as relays of the power supply line to the large capacity load are turned off. With this series of operations, even when the connected large-capacity load is turned off, it is possible to prevent the output voltage and current of the battery from temporarily and suddenly increasing.

FIG. 4 is a diagram showing a phase control circuit according to one embodiment of the present invention. The three phase control circuits shown in the figure have the same configuration. Further, the phase control circuit comprises a synchronizing signal generating circuit 10, an integrating circuit 11, a comparing circuit 12, and a gate circuit 13 each surrounded by a chain line. In FIG. 4, the English characters R, D, C,
Tr or OP indicates a resistor, a diode, a capacitor, a transistor, or an operational amplifier, respectively. Further, VCC is a power supply, and GND is a ground.

In the synchronous signal generating circuit 10 shown in FIG.
Instead of a conventional transformer input type using a transformer or a resistance voltage dividing type using a resistor, an AC input from a generator is received by using an optical coupling element 20 composed of a light emitting diode and a phototransistor. In this case, since signal transmission is performed by using light as an intermediary, the insulation between the generator and the control circuit system is improved, and the effect of electrical noise from the generator is reduced, thereby ensuring high reliability. .

FIG. 5 is a diagram showing a reference voltage generation circuit 8 and a reference voltage control circuit 9 according to one embodiment of the present invention. In FIG. 1, the reference voltage generation circuit 8 includes a voltage detection circuit 14 and a charge / discharge circuit 15 surrounded by a chain line. The reference voltage control circuit 9 includes a soft start circuit 16, a voltage monitoring circuit 17, and an external on / off control circuit 18 surrounded by a chain line. In FIG. 5, the letters R, D, C, Tr, or OP indicate a resistor, a diode, a capacitor, a transistor, or an operational amplifier, respectively. Further, VCC is a power supply, and GND is a ground.

The voltage detection circuit 14 divides the battery voltage by the resistors R14 and R15 and inputs the voltage to the inverting input side (-) of the operational amplifier OP4. The power supply voltage VCC is applied to the other non-inverting input (+) of R17 and R16. And the divided voltage is input. Since the operational amplifier OP4 operates as a comparator, the voltage on the non-inverting input side is used as a reference voltage and the voltage on the inverting side, that is, the battery voltage is compared. When the battery voltage is higher than the reference voltage, the output of OP4 becomes low level. Tr3 is turned on, and the capacitor C7 of the charge / discharge circuit 15 is charged via R20. On the other hand, when the battery voltage is lower than the reference voltage, the output of OP4 becomes high level, Tr3 is turned off, and the capacitor C7 of the charging / discharging circuit 15 is turned off.
Discharges via R25. Since the voltage of the capacitor C7 is output as a reference voltage to the comparison circuit 12 of the phase control circuit 7, a high voltage reference voltage is used when the battery voltage is high, and a low voltage is used when the battery voltage is low. The reference voltage will be output. Resistance R20 and R
Numeral 25 gives the time constant of charging and discharging of the capacitor C7, respectively. When the resistance values of the resistors R20 and R25 are increased, the time constant increases and the fluctuation of the reference voltage decreases, but the responsiveness deteriorates. Also, when the resistance values of the resistors R20 and R25 are reduced, the time constant is reduced and the response is improved, but the fluctuation of the reference voltage is increased. Therefore, R20
And the resistance value of R25 are determined to have a good balance between the response and the variation.

Next, the operation of the soft start circuit 16 will be described. The soft start circuit 16 inputs the output signal of the synchronizing signal generation circuit 10 of the phase control circuit 7 to the non-inverting input side (+) of the operational amplifier OP6, and supplies the power supply voltage VCC to R35 to the other inverting input (-). The voltage divided by R34 is input. Since the operational amplifier OP6 operates as a comparator, the voltage on the inverting input side is used as a reference voltage and the voltage on the non-inverting side is compared with a voltage signal synchronized with the AC output voltage of the generator. , The output of OP4 becomes low level, Tr5 is turned on, and the capacitor C9 is charged via R31. When the AC output voltage of the generator is higher than the reference voltage, the output of OP6 becomes high level, Tr5 is turned off, and capacitor C9 is discharged via R32.
Here, C9, R31 and R32 are set to appropriate values, and C9
Is a voltage proportional to the frequency of the generator, that is, the rotation speed. That is, a frequency-voltage conversion circuit is configured. The voltage of C9, that is, the voltage proportional to the rotation speed of the generator, is input to the inverting input (-) of the operational amplifier OP5, and the power supply voltage VCC is applied to the other non-inverting input (+).
Is divided by R28 and R29. Since the operational amplifier OP5 operates as a comparator, the voltage on the non-inverting input side is used as a reference voltage, and the voltage on the inverting side, that is, the voltage proportional to the rotational speed of the generator is compared. If the voltage is lower than the reference voltage, that is, if the number of revolutions of the generator is lower than the reference value, the output of OP5 goes to a high level, charges the above-mentioned capacitor C7 and keeps it at a high voltage, and at the same time Tr6 via D9. Is turned on and the indicator lamp lights up. However, when the voltage proportional to the rotation speed of the generator is higher than the reference voltage, that is, when the rotation speed of the generator is higher than the reference value, the output of OP4 is at the low level, and the voltage of the capacitor C7 becomes low. Has no effect and the indicator lamp does not light.

Next, the operation of the voltage monitoring circuit 17 will be described. The voltage monitoring circuit 17 includes the soft start circuit 14
A voltage signal obtained by dividing the battery voltage of the operational amplifier OP7
To the non-inverting input side (+) of OP8, to the inverting input side (-) of OP8, and to the inverting input (-) of OP7, a voltage obtained by dividing the power supply voltage VCC by R36 and R37 + R38. The power supply voltage VCC is applied to the non-inverting input (+) of OP8 by R
The voltage divided by 36 + R37 and R38 is input. Since the outputs of the operational amplifiers OP7 and OP8 are connected by diodes D10 and D11, respectively,
If any one of the operational amplifiers OP7 and OP8 is at a high level, the output of the voltage monitoring circuit 17 is a so-called AND circuit that goes high. Operational amplifiers OP7 and O
Since P8 operates as a comparator, OP7 compares the voltage on the inverting input side with the non-inverting side voltage, that is, the battery voltage, using the voltage on the inverting input side as a reference voltage.
7, when the battery voltage is higher than a predetermined voltage (H), that is, when the battery voltage is higher than a preset voltage (H).
7 is at a high level. OP8 uses the voltage on the non-inverting input side as a reference voltage and compares the voltage on the inverting side, that is, the battery voltage.
7, when the battery voltage is lower than a preset voltage (L), that is, when the battery voltage is lower than a preset voltage (L).
7 is at a high level. When the battery voltage is between the voltage (H) and the voltage (L), the output of the voltage monitoring circuit 17 is at a low level. This voltage monitoring circuit 17
Is connected to the above-mentioned capacitor C7, so when the battery voltage is higher than the voltage (H) or lower than the voltage (L), the voltage of C7 is maintained at a high voltage,
At the same time, Tr6 is turned on via D12 and the indicator lamp is turned on. However, when the battery voltage is between the voltage H and the voltage L, the voltage of C7 is not affected, and the indicator lamp does not light. This circuit is R3
6, by setting R37 and R38 appropriately
It is possible to freely monitor the overvoltage, the voltage (H), the low voltage, and the voltage (L) of the battery voltage.

Finally, the external load on / off control circuit 18
Will be described. External load on / off control circuit 18
Is a signal to turn off the load from the outside before the relay or other contact is actually turned off.
14 and the output of Tr4 is R23
, The Tr14 is turned on by the load-off signal (low level) to maintain the voltage of C7 at a high voltage. If there is no load-off signal, Tr14 is turned off and the C7 Does not affect voltage.

While the preferred embodiment has been described above,
The present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention. For example, the phase control circuit shown in FIGS.
The reference voltage generation circuit and the reference voltage control circuit are merely examples, and it goes without saying that a circuit having another configuration may be used.

[0039]

As described above, in the voltage control apparatus for a magnet type generator according to the present invention, the reference voltage generation circuit detects the battery voltage and generates the reference voltage following the voltage change. Since the battery voltage changes depending on the frequency of the AC output signal of the generator, as a result, a reference voltage corresponding to the frequency change of the AC output signal of the generator is supplied from the reference voltage generation circuit. Then, in the phase control circuit, the reference voltage is compared with a sawtooth signal which is an integrated output of the generator output, and a trigger signal determined by an intersection between the reference voltage and the sawtooth signal is supplied to the phase control element. That is,
When the frequency of the AC output signal of the generator is low, the frequency of the trigger signal is also low, and the time interval until the phase control element is fired is long. Conversely, if the frequency of the AC output signal of the generator is large, the frequency of the trigger signal will also be large, and the time interval until the phase control element will be fired will be short, and the generator will supply optimal power to the battery and load. Become so. In this way, it is possible to perform voltage control with an excellent response to a frequency change of the AC output signal of the generator.

Further, in the voltage control apparatus for the magnet type generator according to the present invention, the reference voltage generation circuit generates a reference voltage output following the battery potential by so-called feedback control. Therefore, it is possible to perform voltage control with extremely good follow-up not only for fluctuations in the rotation of the generator, but also for fluctuations in the load connected to the battery or changes over time in the magnets of the generator.

Further, in the voltage control apparatus for a magnetic generator according to the present invention, the reference voltage control circuit supplies the reference voltage from the reference voltage generation circuit to the phase control circuit until the engine speed reaches a predetermined value. The restriction limits the supply of large power from the generator to the load immediately after starting the engine. As a result, it is possible to perform extremely good voltage control that follows the state of the engine without hindering smooth start of the engine.

Further, in the voltage control apparatus for a magnet type generator according to the present invention, the reference voltage control circuit monitors the output voltage of the battery, and when the output voltage does not fall within the predetermined reference voltage width, the charge / discharge circuit A constant abnormal voltage signal is output to the output line of. Thus, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit, a constant voltage is input to the comparison circuit, so that phase control by the phase control circuit is limited. As a result, power is not supplied from the generator to the load. Thus, even when an abnormality such as a disconnection of the battery terminal occurs, it is possible to prevent the power of the generator from being supplied to the load and generating an excessive voltage, thereby preventing the load from being destroyed.

Further, in the voltage control apparatus for a magnet type generator according to the present invention, the reference voltage control circuit may control the output line of the charge / discharge circuit to respond to an off signal of a large-capacity load supplied from the outside. Outputs a voltage signal. As a result, regardless of the magnitude of the reference voltage output from the reference voltage generation circuit,
Since a constant voltage is input to the comparison circuit, phase control by the phase control circuit is limited, and power is not supplied from the generator to the load. As a result, even when the connected large-capacity load is turned off, it is possible to prevent the output voltage and current of the battery from temporarily and suddenly increasing.

Further, in the voltage control apparatus for a magnet type generator according to the present invention, the phase control circuit receives an AC input from the generator using an optical coupling element. Therefore, since the signal is transmitted and received using the light as an intermediate, the insulation between the generator and the control circuit system is improved, and the influence of electrical noise from the generator is reduced, so that high reliability can be secured.

Further, the voltage control device of the magnet generator according to the present invention does not require a complicated circuit such as an FV converter, so that the circuit configuration is simple, the size of the device can be reduced, and the cost can be reduced. Can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a voltage control device of a magnet generator according to an embodiment of the present invention.

FIG. 2 is a diagram showing operation waveforms of respective parts of a phase control circuit in the voltage control device of the present invention.

FIG. 3 is a diagram showing a battery output voltage and a current when a load is turned off according to an embodiment of the present invention.

FIG. 4 is a diagram showing a phase control circuit according to one embodiment of the present invention.

FIG. 5 is a diagram showing a reference voltage generation circuit and a reference voltage control circuit according to one embodiment of the present invention.

FIG. 6 is a diagram showing operation waveforms of various parts of a conventional phase control circuit.

FIG. 7 is a diagram showing operation waveforms of respective parts of a conventional phase control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet type generator 2 Phase control element (thyristor) 3 Rectifier (diode) 4 Generator with full wave rectifier 5 Battery 6 Load 7 Phase control circuit 8 Reference voltage generation circuit 9 Reference voltage control circuit 10 Synchronization signal generation circuit REFERENCE SIGNS LIST 11 integration circuit 12 comparison circuit 13 gate circuit 14 voltage detection circuit 15 charge / discharge circuit 16 soft start circuit 17 voltage monitoring circuit 18 external on / off control circuit 19 indicator lamp drive circuit 20 optical coupling element 100 voltage Control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02P 9/00 H02J 7/14 H02M 7/155

Claims (4)

(57) [Claims] 1. A rectifier bridge circuit comprising a magnet generator, a rectifier element and a phase control element for rectifying an output of the magnet generator, a battery charged by an output of the rectifier bridge circuit, and a battery voltage. A charge / discharge circuit that compares a predetermined voltage and charges the capacitor when the battery voltage is higher than the predetermined voltage, and discharges the capacitor when the battery voltage is lower than the predetermined voltage.
A reference voltage generation circuit that outputs the voltage of the capacitor as a reference voltage, and controls the phase control element by using the AC output voltage of the magnet type generator as an input and the integrated voltage of the AC output voltage and the reference voltage. A phase control circuit that performs phase control of a generated voltage of the magnet generator.In the voltage control device for the magnet generator, the reference voltage output from the reference voltage generation circuit is not input to the phase control circuit. A magnet generator comprising: a reference voltage control circuit including a limiting unit that limits the voltage and a unit that generates an alternative reference voltage that outputs a predetermined voltage to the phase control circuit instead of the reference voltage. Voltage control device. 2. The system according to claim 1, wherein said reference voltage control circuit detects a rotation speed of said magnet generator from an AC output voltage of said magnet generator, and wherein said rotation speed is equal to or less than a predetermined reference rotation speed. 2. The voltage control device for a magnet-type generator according to claim 1, further comprising: activating said limiting means and generating said alternative reference voltage. 3. The reference voltage control circuit according to claim 2, wherein said reference voltage control circuit activates said limiting means when said battery voltage is not within a predetermined reference voltage range, and generates said alternative reference voltage. The voltage control device for a magnet-type generator according to claim 1, wherein 4. The reference voltage control circuit detects a signal indicating that an electric load connected to the battery is turned off, and when detecting the signal, activates the limiting means and generates the alternative reference voltage. The voltage control device for a magnet-type generator according to claim 1, wherein