JPH0345637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a generator whose load is a discharge lamp having a discharge lamp ballast.

The load on private power generation equipment used to be mostly electrical equipment that uses slow-phase current, such as motors, but recently, the load has become limited to lighting equipment such as HID lamps (high-intensity discharge lamps). It's here. In the discharge lamp ballast used for lighting HID lamps, etc., a large amount of phase-advanced current flows when the lamp is restarted.

As shown in FIG. 1, in a conventional generator, a diesel engine 1 rotates a generator body 2 to supply the output of an armature winding 2a to a load. The output voltage of the line 2a is converted to direct current by the full-wave rectifier 4 via the transformer 3 and applied to the field winding 2b (voltage feedback), and the output current of the armature winding 2a is converted to direct current by the full-wave rectifier 4 via the current transformer 5. By converting the DC current in the wave rectifier 6 and supplying it to the field winding 2b (current feedback), the excitation voltage is increased in accordance with the increase in the output current of the armature winding 2a, and the output current of the armature winding 2a is increased. This compensates for the decrease in output voltage caused by the increase in output voltage (feedback control).

However, if a phase-advanced current flows through the armature winding 2a of the generator main body 2, a magnetizing effect occurs in which a magnetic field is created on the field side by the current generated by the armature rather than by the magnetic force from the field winding 2b. As the rotor crosses the magnetized inside, extra voltage will be generated.
Then, even if the flowing current is phase-advanced, the generator feeds back the current to the field winding 2b, and eventually increases the output voltage of the armature winding 2a.

On the other hand, discharge lamp ballasts 9 and 10 for lighting discharge lamps 7 and 8 such as HID lamps are equipped with large-capacity power factor improving coils 9a and 10a as well as high-capacity coils 9a and 10a. capacitor 9
b, 10b. This discharge lamp ballast 9,
10, when the discharge lamps 7 and 8 are lit,
Chiyoke coils 9a, 10a and capacitor 9b,
It is designed to have a high power factor in combination with capacitors 9b and 10b, and when no current flows through the choke coils 9a and 10a, such as when restarting the discharge lamps 7 and 8, a large amount of phase-advanced current flows through the capacitors 9b and 10b. flows.

In a generator in which many discharge lamp ballasts 9 and 10 act as a load, a large amount of phase-advanced current flows when the discharge lamps 7 and 8 are restarted, and as described above, due to the flow of phase-advanced current, the electrical power The output voltage of the child winding 2a increases abnormally, and the discharge lamp ballast 9, 10, which is the load,
The disadvantage is that the parts are burned out. In particular, in the case of private power generation equipment, it is often used as an emergency power source, and as shown in Figure 1, it is usually used as a commercial power source.
1 to discharge lamps 7, 8 and discharge lamp ballasts 9, 10 through a switch 12 and a circuit breaker 13, and when a power outage occurs, the switch 12 switches the power supply to the load from the commercial power supply 11 to the generator power supply. However, at the moment the power is switched to the generator power source, the discharge lamps 7 and 8, especially the HID lamps, are restarted, and the above-mentioned inconvenience is very likely to occur.

Note that the discharge lamp ballasts 9 and 10 have a high power factor except when restarting, and a slight phase lag or a slight phase advance does not have a large effect on the generator. Also, during initial startup, the lamp current is large and the power factor is quite low, but since it is on the slow phase side, it does not affect the generator.

In addition, FIG. 2 shows a waveform diagram of each part of FIG. 1,
A indicates the lamp voltage, B indicates the current flowing to the load, and C indicates the generator voltage. Time t ₀ ~ t ₁
is the initial starting period of the discharge lamps 7 and 8 by the commercial power source 11, the lamp voltage gradually increases from zero, a slow phase low power factor current flows as the load current, and the generator voltage also gradually increases.

Time t ₁ to _{t 2} is a stable lighting period by the commercial power supply 11, in which the lamp voltage becomes constant, the load current has a high power factor and a slight phase lag, and the generator voltage also becomes constant.

Time t ₂ to _{t 3} is a restart period by the generator power supply after the power outage of the commercial power supply 11, and the generator voltage and lamp voltage abnormally increase, and the lamp current becomes phase advanced.

Time t ₃ ~ is a stable lighting period due to the generator power supply,
The state is the same as the stable lighting period due to the commercial power supply 11.

Therefore, an object of the present invention is to provide a generator that can extract a normal voltage regardless of whether a slow phase current or a fast phase current flows.

A first embodiment of the invention is shown in FIGS. 3 and 4. That is, this generator has armature winding 2
Current phase of the output of a (current lagging phase or current leading phase)
is detected by the power factor detection device 14, and the switch 15 is closed when the current is leading, and the switch 15 is closed when the power factor is 1.0 or the current is lagging.
By opening and closing the switch 15, energization to the relay 16 is controlled to close the contact 16.
a and 16b to change the feedback polarity of the output current of the armature winding 2a when the output of the armature winding 2a is a current phase leading when the output of the armature winding 2a is a power factor of 1.0 or a current phase lag. The polarity is reversed to that of . In this case, the power factor detection device 14
supplies the output current of the armature winding 2a to the fixed coil 14a, applies the output voltage of the armature winding 2a to one coil of the movable cross coil 14b via the resistor 14c, and applies the output voltage of the armature winding 2a to one coil of the movable cross coil 14b. The output voltage of the armature winding 2a is applied to the coil through an inductance coil 14d, and the switch 15 has a movable contact 15a provided at the tip of a pointer 14e provided on the movable crossing coil 14b, and a fixed contact 15b. I am facing it.

The rest of the structure is the same as that shown in FIG.

Next, the operation of the power factor detection device 14 will be explained. When a current with a power factor of 1.0 or a slow phase current flows through the armature winding 2a, the pointer 14 of the power factor detection device 14
e is stationary at the center or swings to the slow phase side, the switch 15 is opened, the relay 16 is not excited, the relay contacts 16a and 16b are on the NC side, and the current is in the normal polarity with respect to the generator main body 2b. A return takes place. On the other hand, when a phase-advanced current flows through the armature winding 2a, the pointer of the power factor detection device 14 swings toward the phase-advanced side, and the movable contact 15a moves toward the fixed contact 15b.
Switch 15 is closed and relay 16 is energized. As a result, relay contacts 16a and 16b
Switching from the NC side to the NO side, current feedback is performed to the field winding 2b with a polarity opposite to that when the power factor is 1.0 or a slow phase.

Next, the overall operation will be explained. Assume that the generator is currently in operation. When the circuit breaker 13 is in the "open" state, the power factor is 1.0 and the power factor detection device 14 remains stationary with the pointer 14e at the center. Then, the relay 16 is not excited, and current feedback is performed with normal polarity to the field winding 2b.

Thereafter, when the circuit breaker 13 is set to the "closed" state and, for example, a phase-advanced current flows when restarting the discharge lamps 7 and 8, the pointer 14e of the power factor detection device 14
swings to the phase advance side, the switch 15 is closed, and current feedback is performed to the field winding 2b with a polarity opposite to the normal polarity. Therefore, a voltage obtained by subtracting the voltage due to current feedback from the voltage due to voltage feedback is applied to the field winding 2b, and the field current is considerably reduced. As a result, the output voltage of the armature winding 2a is in a decreasing direction, and due to the magnetizing effect of the advancing phase current, the output voltage of the armature winding 2a is combined with the voltage in the increasing direction.
The output voltage of a becomes normal.

After that, when the discharge lamps 7 and 8 shift to a stable lighting state and the advanced phase current stops flowing, the switch 15 of the power factor detection device 14 is opened and the current is returned to the field winding 2b with the normal polarity. It becomes like this.

In this way, in this embodiment, the polarity of the current feedback to the field winding 2b is automatically switched by detecting whether the output of the armature winding 2a is leading or lagging. During operation of the generator, even if the output current of the armature winding 2a changes to a slow phase or a fast phase, the output voltage of the armature winding 2a will not be abnormally increased. No matter which phase of current flows, the more the current flows, the larger the feedback voltage becomes, and the output voltage of the armature winding 2a can be kept constant. In addition, since phase leading or lagging is determined based on the entire load current, it can be applied to all loads.

Incidentally, in the above embodiment, the power factor detection device 14 using a power factor meter was used to detect the leading or lagging phase of the output current of the armature winding 2a, but it is also possible to detect the phase using a Hall element. You may do so. Moreover, in the power factor detection device 14, instead of moving the pointer 14e, the generated magnetic field may be converted into an electric signal. Further, a photocoupler or the like may be used instead of the switch 15.

A second embodiment of the invention is shown in FIG. That is, in this generator, which targets the discharge lamp ballasts 9 and 10 as a load, the field current is reduced only during the period in which the phase-advanced current is expected to flow. After starting according to a command, the timer circuit 18 switches the timer contacts 18a and 18b to the NO side for a certain period of time, and during that period the polarity of the current feedback to the field winding 2b is reversed from the normal polarity and the phase advances. This is to prevent an abnormal increase in the output voltage of the armature winding 2a due to current flow.

The rest of the structure is the same as that in FIG.

Next, the operation will be explained. Now, when a start signal (relay closes due to stoppage) is applied to the start command signal circuit 17 of the generator, the diesel engine 1 starts and the generator main body 2 starts rotating. At the same time, the timer circuit 18 is activated, and the timer contacts 18a and 18b connect the full-wave rectifier 6 to the field winding 2b with a polarity opposite to the normal polarity, thereby performing current feedback with the polarity opposite to the normal polarity. As a result, the first
The output voltage of the armature winding 2a is maintained normally, and the more the advanced phase current flows, the larger the feedback voltage becomes, and the output voltage of the armature winding 2a increases. Since it goes in the direction of suppressing the current, it is effective no matter what phase-advanced current flows.

This embodiment is effective when combined with the generator main body 2 and a high power factor discharge lamp ballast, and the set time of the timer circuit 18 is determined by the discharge lamp 7,
It is optimal to set the time to 5 to 10 minutes, which is the time required to restart 8.

After the timer time ends, the timer contacts 18a, 1
8b is switched to the NC side, and current feedback to the field winding 2b is performed with the normal polarity. Therefore, when the discharge lamps 7 and 8 are lit stably thereafter, the discharge lamp ballasts 9 and 10 are switched to the NC side. Since the armature winding 2a itself has a slight phase lag (or phase lead), the armature winding 2a supplies a stable voltage.

In the above embodiment, the timer circuit 18 is used to reverse the polarity of the current feedback for a certain period of time after the generator is started, but it is also possible to use a manual switch or the like to switch the polarity only for a period when the phase is expected to advance. good. In addition, even if the generator main body 2 starts, the timer circuit 18 will not be effective if the circuit breaker 13 is "open", so if the circuit breaker 13 becomes "closed" after the generator main body 2 starts, the timer circuit 18 will not be effective. At the same time, timer circuit 1
8 may be activated.

In this way, in this embodiment, when the generator main body 2 and the discharge lamp load are combined, it is possible to prevent the generation of abnormal voltage due to the advanced phase current at the time of restart.

As described above, the generator of the present invention includes a generator main body having an armature winding and a field winding, a discharge lamp having a discharge lamp ballast serving as a load of the generator main body, and a generator main body having an armature winding and a field winding. a voltage feedback circuit for voltage feedback of the output of the winding to the field winding; a current feedback circuit for current feedback of the output of the armature winding to the field winding;
Current feedback polarity switching means for changing the feedback polarity of the current feedback circuit when the current phase of the output of the armature winding is advanced to the polarity when the current phase of the output of the armature winding is slow, The voltage feedback circuit includes a transformer having a primary winding connected to the armature winding, and a first transformer having an input terminal connected to the secondary winding of the transformer and an output terminal connected to the field winding. The current feedback circuit includes a current transformer having a primary winding connected to the armature winding, an input terminal connected to the secondary winding of this current transformer, and an output terminal connected to the field. A second rectifier is connected to the winding, and a relay contact is interposed between the output terminal of the second rectifier and the field winding to control the voltage applied from the second rectifier to the field winding. Since the relay circuit is configured with a relay circuit that switches polarity, and the relay circuit is activated by the output signal of the current feedback switching means, a normal voltage can be obtained regardless of whether a slow phase current or a leading phase current flows. It has the effect of being able to.

Next, a generator that can achieve the same purpose as the first embodiment of the present invention will be described with reference to FIGS. 6 and 7.

As shown in FIG. 6, this generator includes a discharge lamp ballast 9, a discharge lamp 7, discharge lamp ballasts 10 and 8, a discharge lamp ballast 20 (a chiyoke coil 20a and a capacitor 20b), and a discharge lamp 19 as loads. are connected by the feed wiring 24, respectively, and the relays 21, 22, 23 are connected in parallel to the discharge lamps 7, 8, 19, respectively, and the normally open relay contacts 21a, 22a, 23a are connected to the corresponding ones in the feed wiring 24. It is inserted immediately after the relays 21, 22, and 23, and only when the discharge lamps 7, 8, and 19 are restarted and the lamp voltage increases, the corresponding relays 21, 22, and 23 are activated, respectively, and the relays are activated. By opening the contacts 21a, 22a, 23a, the relay contacts 21a,
Power is not supplied to the stages subsequent to 22a and 23a, and the discharge lamps 7, 8, and 19 are sequentially restarted to suppress the phase-advanced current at the time of restart as much as possible.
This ensures that the voltage will hardly rise. In this case, relays 21, 22, and 23 have a rated voltage of 80
% or less, it will not operate.

Next, the operation will be explained. Now, assume that the power supply voltage is 200V. As shown in FIG. 7, time t ₀
When the commercial power supply 11 is turned on, the discharge lamps 7,
8 and 19 are initially started at the same time, and the lamp voltage gradually increases. After approximately 2 to 5 minutes have elapsed, at time _t1 , the discharge lamps 7, 8, and 19 simultaneously enter a stable lighting state, and the lamp voltage becomes approximately 100V.
After that, when the commercial power supply 11 is interrupted, the lamp voltage suddenly drops to zero, and the discharge lamps 7, 8, 1
9 goes out. At time t ₂ immediately after that, the generator body 2
When the motor is started, an output appears from the armature winding 2a and power is supplied to the load. Thereby the discharge lamp 7
However, at the time of restart, both ends of the discharge lamp 7 are in a high impedance state and are close to a no-load state, and the lamp voltage becomes approximately 200V, the relay 21 is activated, the relay contact 21a is opened, and the discharge lamp 8, 19
will not start at this point. Thereafter, the lamp voltage decreases with the passage of time, and at time _t3 , after 5 to 10 minutes, the lamp enters a stable lighting state. On the other hand, when the lamp voltage of the discharge lamp 7 decreases to a predetermined value near time t ₃ when the discharge lamp 7 shifts to a stable lighting state, the operation of the relay 21 stops and the relay contact 2
a is closed, power is also supplied to the discharge lamp ballast 10 and the discharge lamp 8, the discharge lamp 8 is restarted, the relay 22 is activated, and the relay contact 22a is opened. When the lamp voltage of the discharge lamp 8 falls to a predetermined value, the relay 22 stops operating and the relay contact 22a closes, and power is also supplied to the discharge lamp ballast 20 and the discharge lamp 19, and the same operation follows. The discharge lamps 7, 8, 19 will be restarted in sequence.

As a result of sequentially restarting the discharge lamps 7, 8, and 19 in this way, the problem that the output voltage of the armature winding 2a increases when a phase-advanced current flows through the armature winding 2a is fundamentally solved. Although the problem cannot be solved, the generation of abnormally high voltage can be prevented by suppressing the phase advance current to a small level. This is because the magnitude of the abnormal voltage is proportional to the rate of advance of the phase-advanced current and the current value. Therefore, considering the degree of advancement and the capacity of the generator, discharge lamp ballasts 9, 10,
20 may be grouped together and restarted in groups one after another. That is, it is sufficient to insert one relay in each group.

Further, the discharge lamp ballasts 9, 10, 20 and the discharge lamps 7, 8, 19 are generally separated from each other. Therefore, it is possible to insert the relays 21, 22, 23 at both ends of the discharge lamps 7, 8, 19 according to the site. Therefore, there is an advantage that there is no need to process the ballast unit or the inside of the lamp, and processing can be performed to suit the site.

In addition, in FIG. 6, the discharge lamps 7, 8, and 19 are configured to be restarted in sequence, but as shown in FIG. , 26 as relay contact 2
1a′, 22a′, and 23a′, respectively.
When the lamp voltage is low during initial startup and stable lighting, the relays 21, 22, and 23 are not activated, but the relay contacts 21a', 22a', and 23a' are opened to disconnect the chiyoke coils 24 to 26, and the discharge lamp 7 , 8, 19, when the lamp voltage becomes high, the relays 21 to 24 are activated to close the relay contacts 21a', 22a', and 23a', and a slow-phase current flows through the inductances 24 to 26. The advanced phase current flowing through the discharge lamp ballasts 9, 10, and 20 is canceled out.

Next, an inverter device used as a power source for discharge lamps and computers in emergencies such as power outages will be explained.

As shown in FIG. 9, the conventional inverter device supplies power from a storage battery 31 to a commercial frequency oscillation circuit 33 via a start switch 32, and connects a commercial frequency oscillation transformer 34 to the output side of this commercial frequency oscillation circuit 33. The secondary output of this commercial frequency oscillation transformer 34 is supplied to a discharge lamp load 36, a computer load 37, etc. via a circuit breaker 35. Note that 38 is a capacitor that determines the oscillation frequency.

FIG. 10 is a characteristic diagram of the output voltage and output current of the inverter device, in which a drooping characteristic appears.

When the inverter device is activated due to a power outage or the like, the voltage is simultaneously applied to the discharge lamp load 36, computer load 37, and the like. Discharge lamp 36a
At the initial stage of lighting, it is the same as a short circuit, and a large current flows through the chiyoke coil 36b. At this time, since the inverter device exceeds the rated current point A, it enters a drooping point and stabilizes at point B, and the output voltage becomes considerably low. As a result, there is a risk that the discharge lamp 36a may not be able to reach the lighting state at that voltage, that the voltage drop may cause a momentary interruption of the power supply, causing other discharge lamps to go out, or that the computer load 37 may malfunction.

The inverter device shown in FIG. 11 can solve the above problem, and supplies power from a storage battery 31 to a high frequency oscillation circuit 39 via a starting switch 32, and a high frequency oscillation transformer 40 is connected to the output side of this high frequency oscillation circuit 39.
The secondary output of this high frequency oscillation transformer 40 is superimposed on the secondary output of the commercial frequency oscillation transformer 34 to generate a discharge lamp load 36 and a computer load 37.
The overlapping period is limited to a certain period of time after the circuit breaker 35 is closed by a switch 41 which is opened and closed by a timer circuit (not shown). Note that 42 is a chiyoke coil for preventing high frequency interference.

The operation will be explained. When the start switch 32 is closed, the commercial frequency oscillation circuit 34 and the high frequency oscillation circuit 39 start oscillating. At this time, switch 41 is open.

Thereafter, when the circuit breaker 35 is closed, a large current flows through the discharge lamp load 36 for starting. Then, the output voltage at the commercial frequency decreases due to the drooping characteristic.
However, at the same time as the circuit breaker 35 is closed, the timer circuit is activated to close the switch 41 and apply high frequency voltage to the load. At this time, this high frequency voltage does not go around to the commercial frequency oscillation transformer 34 because of the chiyoke coil 42.

When a high frequency voltage is applied to the discharge lamp load 36, it is blocked by the choke coil 36b, making it difficult for high frequency current to flow. However, a high high frequency voltage potential is applied to both ends of the discharge lamp 36a. Therefore, a potential for lighting the discharge lamp 36a is applied,
Even when the lamp voltage decreases due to the drooping characteristics of the commercial frequency, the discharge lamp 36a can be lit by applying this high frequency voltage.

When the discharge lamp 36a lights up stably after a certain period of time has elapsed, the switch 41 opens to reduce energy loss in the storage battery 31.

Figure 12 is a waveform diagram of each part of the circuit in Figure 11.
A indicates the commercial frequency output voltage, B indicates the high frequency voltage, C indicates the commercial frequency output current, and D indicates the lamp applied voltage.

During the period from time t' ₀ to t' ₁ there is no load, and the voltage applied to the lamp is zero. During the period from time t' ₁ to t' ₂ when the load is turned on, the commercial frequency current increases and the commercial frequency voltage decreases, and the lamp voltage is a superposition of the commercial frequency voltage and the high frequency voltage. The period from time t' ₂ is a stable period, where the commercial frequency current decreases, the commercial frequency voltage increases, and the lamp voltage becomes only the commercial frequency voltage.

Computer load 37 to inverter device load
When connected, when a commercial frequency voltage is applied, the capacitor 37b is charged through the transformer 37a, but due to the large capacitance of the capacitor 37b, a drooping characteristic occurs and the commercial frequency voltage decreases. However, if a high frequency voltage is applied at the same time,
Because of the commercial frequency transformer 37a on the computer side, it is difficult for a large current to flow, and only the potential is applied to the capacitor 37b, so that it is gradually charged.

FIG. 13 shows an inverter device that can achieve the same purpose as the one in FIG. 11, in which the switch 41 in FIG. 11 is removed, and the switch 41 in FIG. The primary winding of the current transformer 43 is inserted in the power supply path between the current transformer 43 and the voltage shown in FIG.
A bidirectional switch element 44 such as a diagonal having current characteristics is connected thereto. In this case, the current transformer 43 is made of ferrite or the like and has low impedance to commercial frequencies.

Next, the operation will be explained with reference to FIG.
Fig. 15A shows the commercial frequency output voltage, Fig. 15B shows the high frequency output voltage, Fig. 15C shows the commercial frequency output current, Fig. 15D shows the load applied voltage, and the Fig. 15D shows the load applied voltage.
The period from t″ ₀ to t″ ₁ is during steady load, the period from time t″ ₁ to t″ ₂ is when additional load is applied, and the period from time t″ ₂ to is during steady load after addition of the load.

During a steady load, when the commercial frequency output current is small, the secondary voltage of the current transformer 43 is low, the bidirectional switch element 44 is in a cutoff state, and the current transformer 43 has a high impedance with respect to the high frequency voltage. , high frequency current does not flow through the discharge lamp load 36 and the computer load 37.

On the other hand, when the commercial frequency output current increases and exceeds a certain level L ₁ at the beginning of load application, the secondary voltage of the current transformer exceeds the breakover voltage V _BO of the bidirectional switch element 44 only during the period in which it exceeds it. The two-way switch element 44 becomes conductive, and the two-way switch element 44 of the current transformer 43 becomes conductive.
The next side becomes short-circuited. As a result, the reactance on the primary side of the current transformer 43 rapidly decreases, and high frequency current flows into the discharge lamp load 36 and the computer load 37 through the current transformer 43. The subsequent operation is similar to that shown in FIG.

The inverter device shown in FIG. 13 is effective in any period of time without limitation, and is effective whenever a large current flows.

In particular, inverter devices using semiconductors increase the drooping current, so increasing the capacity becomes very expensive, and it is uneconomical to increase the capacity only as a countermeasure against an inrush. If configured like this, such a problem will not occur.

Note that the oscillation frequency of the high-frequency oscillation circuit 39 is appropriately selected depending on the type of load. Furthermore, as a load, it is effective not only for discharge lamps and computers but also for motors.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional generator, Figure 2 A to C
3 is a configuration diagram of the first embodiment of the present invention, FIG. 4 is an enlarged view of the main part, and FIG. 5 is a waveform diagram of each part.
Fig. 6 is a block diagram of a second embodiment of the present invention, Fig. 6 is a block diagram of another first generator, Fig. 7 is a characteristic diagram of its lamp voltage, and Fig. 8 is a diagram of another second generator. Figure 9 is a circuit diagram of a conventional inverter device, Figure 10 is its output voltage-output current characteristic diagram,
Figure 11 is a circuit diagram of the first improvement example, Figure 12A~
D is a waveform diagram of each part, FIG. 13 is a circuit diagram of the second improved example, FIG. 14 is a voltage-current characteristic diagram of a bidirectional switch element, and FIGS. 15 A to D are diagrams of the circuit of FIG. 13. It is a waveform diagram of each part. 2... Generator main body, 2a... Armature winding, 2b
...Field winding, 3...Transformer (voltage feedback circuit),
4... Full wave rectifier, 5... Current transformer (current feedback circuit), 6... Full wave rectifier, 7, 8... Discharge lamp,
9, 10...Discharge lamp ballast, 14...Power factor detection device (current feedback polarity switching means), 15...Switch,
16... Relay, 16a, 16b... Relay contact, 18... Timer circuit (current feedback polarity switching means), 18a, 18b... Timer contact.

Claims (1)

[Scope of Claims] 1. A generator main body 2 having an armature winding 2a and a field winding 2b, and discharge lamps 7 and 8 having discharge lamp ballasts 9 and 10 and serving as a load of the generator main body 2. and a voltage feedback circuit for voltage feedback of the output of the armature winding 2a to the field winding 2b, and the armature winding 2a.
a current feedback circuit that feeds back the output of the armature winding 2a as a current to the field winding 2b; A transformer 3 is provided with a current feedback polarity switching means 14 or 18 for making the polarity opposite to the polarity of the phase current, and the voltage feedback circuit is connected to the armature winding 2a with a primary winding connected to the transformer 3; a first rectifier 4 whose input terminal is connected to the secondary winding of the armature winding 3 and whose output terminal is connected to the field winding 2b; a second rectifier 6 whose input terminal is connected to the secondary winding of this current transformer 5 and whose output terminal is connected to the field winding 2b; Relay contacts 16a, 16b are interposed between the output terminal of the second field winding 2b and the second
and a relay circuit 16 for switching the polarity of the voltage applied from the rectifier 6 to the field winding 2b, and the relay circuit 16 is operated by the output signal of the current feedback polarity switching means 14 or 18. . 2. The generator according to claim 1, wherein the current feedback polarity switching means comprises a power factor detection device 14 for detecting the power factor of the output of the armature winding 2a. 3 The current feedback polarity switching means is a timer circuit 18
A generator according to claim 1, comprising: