JPS6229966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an uninterruptible DC power supply device equipped with a motor generator.

Wireless relay stations are often installed on mountain tops or in undeveloped areas where commercial power is not available, and the power source must be a highly reliable uninterruptible power source.

The present invention can save engine operating time compared to conventional ones, does not require an independent charging device, can downsize the wave device, has a simplified circuit, and has improved stability. It is an object of the present invention to provide a power supply device using a motor generator that can obtain high control of power.

The present invention includes one or more AC motor generators, an uncontrolled rectifier circuit connected to the output of the motor generator, a battery connected to the output of the uncontrolled rectifier circuit, a DC load terminal, and In a power supply device, the rectifier circuit is connected to the battery when the AC engine generator is in operation, and a circuit that disconnects the rectifier circuit from the battery when the AC engine generator is stopped. , the DC load terminal is continuously connected to the battery, the output capacity of the generator is set sufficiently large for the large current generated at the beginning of intermittent charging, and the motor generator is set to a predetermined setting condition. means for intermittently stopping the operation of the motor generator, and controlling the output voltage of the motor generator and the power of its field winding so that the output voltage of the non-controlled rectifier circuit is constant during the operation of the motor generator. The invention is characterized by comprising means for controlling by

This will be explained in detail using drawings.

FIG. 1 is a circuit diagram of a conventional device. In this device, two motor generators EG1 and EG2 are operated alternately, and their AC output is connected to an electromagnetic switch MC1.
Or it is applied to transformer T1 or T2 via MC2, rectified and waved to DC load terminal DC
guided by. CR1 and CR2 are thyristors,
GC1 and GC2 are the ignition circuits, reactors L ₁ and L ₂
and capacitors C ₁ and C ₂ constitute a wave circuit. Battery E is connected to the output point of the wave circuit and is constantly floatingly charged. However, if a failure occurs in the circuit from the motor generator to this battery and power is no longer supplied from these, battery E discharges and supplies power to the DC load terminal DC. When the terminal voltage drops due to battery discharge, the switch SW closes and shorts the silicon dropper SID to prevent the voltage at the DC load terminal DC from dropping.

As described above, the conventional device shown in FIG. 1 can supply uninterrupted power to the DC load terminal DC, but it has the following drawbacks. That is, (1) The automatic charging circuit surrounded by the chain line in Figure 1 is expensive.

(2) When automatic charging is performed using a thyristor, the content of harmonics generated when the thyristor fires is high;
Requires large wave circuit.

(3) The control system of the motor generator and the control system of the automatic charging circuit tend to cause control interference and cause control vibration.

The present invention improves this by providing an uncontrolled rectifier circuit on the output side of the motor generator to supply DC power to the parallel circuit of the DC load and the battery, and the output voltage of this uncontrolled rectifier is It is characterized in that the output voltage of the motor generator is controlled by the current of its field winding so that the output voltage is constant, and the motor generator is operated intermittently to alternately charge and discharge the battery. This saves the engine's extended operation time compared to conventional models, eliminates the need for an independent automatic charging device, and downsizes the wave circuit, simplifying the circuit and providing highly stable control. can be obtained.

FIG. 2 is a circuit configuration diagram of an embodiment of the present invention. In Figure 2, RE1 and RE2 are rectifiers (non-controlled), MC
1, MC2, MC3, MC4 are electromagnetic switch contacts, T
1, T2 is a transformer. The motor generator EG1 has a rectifier RE1, a reactor _L1 , and a magnetic contactor contact.
Through MC3, the motor generator EG2 is connected to RE2,
L ₂ and MC4 respectively charge the battery E and are connected to the DC load terminal DC via the silicon dropper SID. Capacitors C ₁ and C ₂
are L ₁ on the output side of reactors L ₁ and L ₂ respectively
Or connected together with L ₂ to form a wave circuit. Automatic voltage regulator AVR1, AVR
2 detects the output side DC voltage of reactor L ₁ or L ₂ respectively, controls the output voltage to be constant, and connects the field windings F of motor generators EG1 and EG2.
Excitation current is applied to 1 and F2. Also EG1,
The AC output of EG2 is connected to transformers T1 and T2, respectively.
and is connected to supply alternating current power to alternating current load terminal AC via electromagnetic contactor contacts MC1 and MC2. Note that the switch SW and the silicon dropper SID are used to compensate for a drop in battery terminal voltage, similar to the conventional device shown in FIG. Further, although not shown, an output current drooping circuit is provided to prevent the charging current from becoming excessive when the terminal voltage of the battery drops.

In a device configured in this way, the motor generator
When EG1 or EG2 is in operation, power is supplied from it, and when EG1 or EG2 is at rest, power is supplied to the DC load terminal DC by discharging the battery E.
As a characteristic control method of the present invention, the two motor generators EG1 and EG2 are operated intermittently at regular intervals. The situation is shown in the time chart in Figure 3. Figure 3A shows the operating time of the motor generator EG1, Figure 3B shows the operating time of EG2, and the third
Figure C shows the discharge time of battery E, respectively. As shown in FIG. 3, in the device of the present invention, the motor generator EG
A period T is provided during which both EG1 and EG2 are out of operation, and the extended operating time can be saved compared to conventional devices. This is an automatic charging circuit (first
This is because the circuit shown by the chain line in the figure) is omitted, so it is possible to economically construct a large-capacity charging device that can withstand the large current that occurs at the beginning of intermittent charging.

By making the engine operating time intermittently in this manner, engine accidents that occur depending on the operating time are reduced and reliability is improved. In addition, the voltage given to battery E can be adjusted using automatic voltage regulator AVR1 or
AVR2, motor generator and each rectifier RE1 or
Since it is charged with a constant voltage controlled by the control loop of RE2, there is no need to separately install an automatic charging device, making it economical. Furthermore, since there is no control system such as an automatic charging circuit other than this control loop, highly stable control can be performed without causing control interference. Since a thyristor is not used, no harmonic voltage is generated when the thyristor is turned on, and the wave circuit can be made smaller. Also, not using a complicated circuit like an automatic charging device has the effect of improving reliability.

Note that the present invention is not limited to the one shown in the above example, and can be implemented in various configurations by changing the number of motor generators and other modified circuits using additional circuits.

As explained above, according to the present invention, it is possible to downsize the wave circuit without requiring an independent automatic charging device, to perform highly stable control, and to increase the engine operating time. It is possible to save money, simplify the circuit, and improve the reliability of the entire device compared to the conventional one.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional power supply device. FIG. 2 is a configuration diagram of a power supply device according to an embodiment of the present invention. FIG. 3 is an explanatory diagram of the operation of the apparatus shown in FIG. 2. EG1, EG2...Motor generator, F1, F2...
Field winding, AVR1, AVR2... Automatic voltage regulator, MC1~MC4... Electromagnetic switch contact, T1~
T4...Transformer, CR1, CR2...Thyristor, _L1 , _L2 ...Reactor, _C1 , _C2 ...Capacitor, E...Battery, SID...Silicon dropper,
SW...Switch, AC...AC load terminal, DC...
...DC load terminal, RE1, RE2...Uncontrolled rectifier.

Claims (1)

[Claims] 1. One or more AC motor generators, an uncontrolled rectifier circuit connected to the output of the motor generators, and a smoothing wave inserted into the path of the DC output current of the rectifier circuit. a battery connected to the output of the rectifier circuit, a DC load terminal, and when the AC motor generator is operating, the rectifier circuit is connected to the battery, and when the AC motor generator is stopped, the rectifier circuit is connected to the battery. In the power supply device, the DC load terminal is connected continuously to the battery, and the output capacity of the generator is increased by a large amount that occurs at the beginning of intermittent charging. means for intermittently stopping the operation of the motor generator according to predetermined setting conditions, the output voltage of the non-controlled rectifier circuit being set to be sufficiently large with respect to the current; and means for controlling the output voltage of the motor generator by controlling the electric power of its field winding so that the output voltage of the motor generator is constant.