JPH0670482A - Power generating equipment - Google Patents

Abstract

PURPOSE:To provide a power generating equipment whereby even when one generator fails, a power feed is made possible by another generator and in case of parallel generatings the good balance among the generatings is obtained, in the generating equipment wherein parallel power feeds to a common load are performed by a plurality of generators CONSTITUTION:First and second generators 1, 2 driven by an engine charge a battery B. Based on the result obtained by comparing a terminal voltage Vb of the battery B with a predetermined first setting voltage VR, a first voltage-controlling device 3 performs the ON-OFF control of the exciting current of the first generator 1. Also, based on the result obtained by comparing the terminal voltage Vb of the battery B with a second setting voltage Vo, a second voltage-controlling device 4 performs the ON-OFF control of the exciting current of the second generator 2. When the first voltage-controlling device 3 orders the first generator 1 the application of its exciting current, a means for controlling the second setting voltage Vo in the second voltage-controlling device 4 makes the second setting voltage Vo larger than a predetermined reference value. Also, when the first voltage-controlling device 3 orders the first generator 1 the cutting-off of its exciting current, the means for controlling the second setting voltage Vo in the second voltage-controlling device 4 makes the second setting voltage Vo smaller than the predetermined reference value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator for operating a plurality of generators in parallel to supply a common load.

[0002]

2. Description of the Related Art In recent years, there has been a demand for increasing the capacity of a generator due to an increase in on-vehicle electric load. Therefore, Japanese Patent Laid-Open No. 183331/1993 filed by the applicant of the present invention discloses that two generators are operated in parallel. It proposes to power a common load.

[0003]

However, the above conventional parallel operation type power generator adopts an operation control system in which the voltage control device of the first generator also controls the exciting current of the second generator during parallel power generation. Therefore, if the voltage control device of the first generator fails, the second generator stops generating or is in an uncontrolled state, and there is a problem that the battery goes up or is overcharged.

In order to solve this problem, it is possible to operate both generators in parallel independently of each other, but usually the generator control characteristics of both generators have variations. Therefore, for example, when the generator that is more sensitive to the drop in the battery terminal voltage generates electricity, the boosting up of the battery terminal voltage thereby restricts the power generation of the other generator, and the duty ratio of the more sensitive generator is increased. A problem occurs in which the power generation states of both generators are biased, such that the second generator starts power generation only after the battery terminal voltage has dropped to 100% operation.

The present invention has been made in view of the above problems, and in a power generator in which a plurality of generators feed power to a common load in parallel, power can be fed from the other generator regardless of the failure of one generator. It is an object of the present invention to provide a power generation device having good power generation balance during parallel power generation.

[0006]

SUMMARY OF THE INVENTION A power generator according to the present invention comprises an engine driven first generator and a second generator for charging a battery, a voltage related to a terminal voltage of the battery and a predetermined first set voltage. And a second voltage based on a comparison result of a voltage related to a terminal voltage of the battery and a second set voltage, the first voltage control device intermittently controlling the exciting current of the first generator based on a comparison result with the second voltage. A second voltage control device for intermittently controlling the excitation current of the generator, wherein the second voltage control device sets the second set voltage to a predetermined reference when the excitation current energization command of the first voltage control device is given. A power generation device comprising: a second set voltage control unit that increases the value above the reference value and decreases the second set voltage below the reference value when an exciting current cutoff command is issued from the first voltage control device.

In a preferred aspect, the second set voltage control means sets the reference value to the reference value when the signal line for transmitting the exciting current connection / disconnection command signal of the second voltage control device to the first voltage control device is opened. The second set voltage.

[0008]

The first and second engine-driven generators charge the battery. The first voltage control device intermittently controls the exciting current of the first generator based on a result of comparison between a voltage related to the terminal voltage of the battery and a predetermined first set voltage. Second
The voltage control device intermittently controls the exciting current of the second generator based on the comparison result between the voltage related to the terminal voltage of the battery and the second set voltage.

In particular, the second set voltage control means of the second voltage control device is configured to perform the second set voltage control device when the exciting current energization command of the first voltage control device is issued.
The set voltage is increased from a predetermined reference value, and the second set voltage is decreased from the reference value when the first voltage control device issues an exciting current cutoff command. Therefore, even if there is a characteristic variation in each part between the two voltage control devices, the power generation of the second generator is promoted by the increase of the second set voltage during the power generation command of the first generator (when the exciting current is supplied). (1) When the generator stop command is issued (when the exciting current is cut off), the second set voltage is reduced to promote the generator stoppage of the second generator, and as a result, both generators perform intermittent power generation in synchronization.

Further, even if one of the generators is in a power generation control disabled state (for example, constant power generation or power generation disabled) due to some failure, the power generation control of the other generator can be performed regardless of that.

[0011]

As described above, in the power generator of the present invention, the second set voltage is increased from the predetermined reference value at the time of the excitation current energization command of the first voltage control device to shut off the excitation current of the first voltage control device. Since the second set voltage is decreased from the reference value at the time of command, the second generator can be intermittently generated in synchronization with the intermittent power generation of the first generator, and the power generation is not biased to one of both generators, which is excellent. Large power generation can be realized with the power generation balance.

Further, even if one of the generators becomes incapable of power generation control due to some failure, the power generation control of the other generator can be maintained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the power generator of the present invention will be described with reference to FIG. 1 is a first generator and 2 is a second generator, these are usually called alternators. First
The generator 1 is a three-phase armature coil 11 with a stator core winding.
A field coil 13 wound around a field core, a three-phase full-wave rectifier 15 that rectifies the output voltage of the three-phase armature coil 11, and a first voltage control device that interrupts a current flowing to the field coil 13. 3 and 3. The high-level output terminal of the three-phase full-wave rectifier 15 is connected to the high-level terminals of the battery B and the load L, and the low-level output terminal of the three-phase full-wave rectifier 15 is grounded.

The second generator 2 includes a three-phase armature coil 21 wound with a stator core, a field coil 23 wound with a field core, and
A three-phase full-wave rectifier 25 that rectifies the output voltage of the three-phase armature coil 21 and a second voltage control device 4 that interrupts the current flowing to the field coil 23 are provided. The high-level output terminal of the three-phase full-wave rectifier 25 is connected to the high-level terminals of the battery B and the load L,
The low-order output terminal of the three-phase full-wave rectifier 25 is grounded.

The first voltage controller 3 will be described with reference to FIG. The first voltage control device 3 is the same as a normal regulator and includes resistors r1 to r4, a comparator 31, a power transistor 32, and a flywheel diode D. The high-level terminal voltage Vb of the battery B is input to the first voltage controller 3 through the input terminal S, and the voltage dividing series resistor r
The voltage is divided by 1 and r2 and input to the minus input terminal of the comparator 31. A predetermined first set voltage VR is input to the + input terminal of the comparator 31, the comparator 31 compares the divided voltage with the first set voltage VR, and when the divided voltage is larger than the first set voltage VR. A low level is output, and a high level is output when the divided voltage is lower than the first set voltage VR.

The output voltage of the comparator 31 is applied to the base of the power transistor 32 through the base resistor r3. As a result, the power transistor 32 is turned off when the divided voltage is higher than the first set voltage VR, and the divided voltage is It turns on when it is smaller than the first set voltage VR. Since the emitter of the power transistor 32 is grounded and the collector is connected to the output end of the three-phase full-wave rectifier 15 through the field coil 13, when the power transistor 32 is turned on, an exciting current is supplied to the field coil 13, 1 The generator 1 generates power and charges the battery B. The high-level terminal of the battery B is connected to the power supply terminal of the comparator 31 through the key switch 5, and the comparator 31 becomes operable when the key switch 5 is turned on.

Further, in this embodiment, the output voltage of the comparator 31 is transmitted to the second voltage controller 4 through the resistor r4 and the transmission line (the signal line in the present invention) L1. Next, the second voltage controller 4 will be described with reference to FIG. The second voltage controller 4 includes resistors r5 to r7 and a comparator 4
1, a power transistor 42, a flywheel diode D, and a voltage switching circuit (second set voltage control means in the present invention) 6 are provided. The voltage Vb at the high terminal of the battery B
Is input to the second voltage controller 4 through the input terminal S.
The input voltage Vb is divided by the voltage dividing series resistors r5 and r6 which are connected in series with each other and one end of which is grounded, and the divided voltage Vb is input to the negative input terminal of the comparator 41. Comparator 41
The second set voltage Vo output from the voltage switching circuit 6 is applied to the + input terminal of the. The comparator 31 compares the divided voltage with the second set voltage Vo, and the divided voltage is the second set voltage V0.
When it is larger than o, a low level is output, and when the divided voltage is smaller than the second set voltage Vo, a high level is output.

The output voltage of the comparator 41 is applied to the base of the power transistor 42 through the base resistor r7. As a result, the power transistor 42 has a second divided voltage.
When the voltage is higher than the set voltage Vo, it is turned off and the divided voltage becomes the second voltage.
It turns on when it is smaller than the set voltage Vo. Since the emitter of the power transistor 42 is grounded and the collector is connected to the output end of the three-phase full-wave rectifier 25 through the field coil 23, when the power transistor 42 is turned on, an exciting current is supplied to the field coil 23, 2 The generator 2 generates power and charges the battery B.

The high terminal of the battery B is connected to the power source end of the comparator 31 and the power source end of the voltage switching circuit 6 through the key switch 5, and when the key switch 5 is turned on, the comparator 31 and the voltage switching circuit 6 can be operated. . Next, the voltage switching circuit 6 which is the main part of this embodiment will be described with reference to FIG.

The voltage switching circuit 6 includes resistors r11 to r24.
, Comparators 61 and 62, grounded emitter switching transistors 63 and 64, and constant voltage diode D
It consists of z and. Comparator 31 of the first voltage controller 3
Input terminal IN of the voltage switching circuit 6 to which the output voltage of
Is connected to the internal high potential line HL through r11, and is also grounded through r12.
It is connected to the-input ends of 1, 62.

Therefore, when the input terminal IN is opened due to a poor connection or disconnection of the signal line L1, a predetermined voltage Vc corresponding to the resistance ratio of r11 and r12 is applied to the negative input terminals of the comparators 61 and 62. When the high level voltage of the comparator 31 is applied to the input terminal IN as the voltage Vin, the high level voltage Vc + ΔV determined by r4, r11 and r12 is applied to the negative input terminals of the comparators 61 and 62. When the low level voltage of the comparator 31 is applied to the input terminal IN, r4 is applied to the negative input terminals of the comparators 61 and 62,
Low level voltage Vc− determined by r11 and r12
ΔV ′ is applied as the input terminal voltage Vin.

On the other hand, r13, r14, and r15 are connected in series between HL and the ground, and the divided voltage VH at the connection point between r13 and r14 is applied to the + input terminal of the comparator 61.
The partial voltage VL (<VH) at the connection point between r14 and r15 is applied to the + input terminal of the comparator 62. Therefore, the input terminal voltage Vin is the high level voltage Vc + ΔV (VH
Is set larger), the comparator 6
When the input terminal voltage Vin reaches the low level voltage Vc-ΔV '(set to be smaller than VL), the comparators 61 and 62 output a high level and the input terminal voltage is output. Vin is the intermediate voltage Vc (V
When it is smaller than H and larger than VL) (when the signal line L1 is disconnected), the comparator 61 becomes high level and the comparator 62 becomes low level.

The transistor 63 is controlled by the comparator 61 through the base resistor r16, and the transistor 6
4 is controlled by the comparator 62 through the base resistor r17, so that when the comparator 61 outputs a high level, the transistor 63 turns on and the comparator 6
When 2 outputs a high level, the transistor 64 turns on.

R18 to r19 and r21 to r24 are resistor networks that output three types of output voltages depending on the intermittent state of the transistors 63 and 64, and r21 to r24 are connected in series between HL and ground in order. r22 and r
The connection point with 23 is the output end. r21 and r22
The connection point between and is grounded through r18 and r19 connected in series, the connection point between r18 and r19 is connected to the collector of the transistor 63, and the emitter thereof is grounded. The connection point between r23 and r24 is the transistor 6
4 and its emitter is grounded.

Therefore, the comparator 31 of the first voltage controller 3 outputs a high level voltage and the input end voltage Vi
When n becomes the above-mentioned high level, both transistors 6
3, 64 are turned off, and as a result, the output voltage Vo is r18-
A high level voltage is obtained by multiplying the internal power supply voltage VHL by a coefficient determined by Kirichoff's law from r19 and r21 to r24. Note that VHL is the voltage of HL, and this voltage is determined by the constant voltage diode Dz.

When the signal line L1 is opened, the input terminal voltage Vin becomes the above intermediate voltage, and the transistor 6
3 is turned off and the transistor 64 is turned on, so that the transistor 64 short-circuits r24 and the output voltage Vo becomes r24.
The voltage drops by the amount of short circuit and becomes the intermediate voltage. In this embodiment, the intermediate voltage of the output voltage Vo is set equal to VR, and the ratio of the voltage dividing resistors r1 and r2 is set to the voltage dividing resistor r.
It is set equal to the ratio of 5 and r6.

Further, when the comparator 31 of the first voltage control device 3 outputs a low level voltage and the input terminal voltage Vin becomes the above-mentioned low level, both the transistors 63 and 64.
Is turned on, and as a result, the transistor 64 short-circuits r24, and further the transistor 63 short-circuits r19, and the output voltage Vo further decreases from the intermediate voltage by the short circuit of r19 and becomes a low level voltage.

The results of the above configurations and operations are summarized below. As described above, when the comparator 31 of the first voltage control device 3 outputs a high level voltage and the first generator 1 generates power, this high level voltage is input to the input terminal IN of the voltage switching circuit 6, As a result, the voltage switching circuit 6 outputs a high level voltage which is higher than the intermediate voltage by a predetermined voltage. As a result, even if the ratio between the voltage dividing resistors r1 and r2 and the ratio between the voltage dividing resistors r5 and r6 vary, for example, when the comparator 31 outputs a high level, the margin is increased by only the predetermined voltage. The comparator 41 also reliably outputs a high level, and both generators 1 and 2 start power generation at the same time.

When the comparator 31 of the first voltage control device 3 outputs a low level voltage and the first generator 1 stops power generation, this low level voltage is input to the input terminal IN of the voltage switching circuit 6. As a result, the voltage switching circuit 6 outputs a low level voltage lower than the intermediate voltage by a predetermined voltage. As a result, even if, for example, the ratio between the voltage dividing resistors r1 and r2 and the ratio between the voltage dividing resistors r5 and r6 vary, when the comparator 31 outputs a low level, the margin is increased by the predetermined voltage. As a result, the comparator 41 also reliably outputs a low level, and both generators 1 and 2 stop generating electricity at the same time.

Further, when the signal line L1 is opened, the input terminal voltage Vin becomes the above-mentioned intermediate voltage, whereby the voltage switching circuit 6 receives the intermediate voltage (here, the comparator 31).
The second voltage control device 4 performs power generation control regardless of the opening of the signal line L1, and the second power generator 2 continuously generates power. Is possible.

Further, if the comparator 61 of the first voltage controller 3 always outputs a high level for some reason, the first generator 1 is always in the power generating state, but the second generator 2 has the + input of the comparator 41. Since the terminal voltage Vo only slightly increases, when the terminal voltage Vb of the battery 1 rises, power generation is stopped and the exciting current is intermittently controlled according to the high level value of the voltage Vo at the + input terminal of the comparator 41. be able to.

Similarly, for some reason, the first voltage controller 3
If the comparator 61 outputs a low level at all times, the first generator 1 is always in a power generation stop state, but the second generator 2 only slightly decreases the voltage Vo at the + input terminal of the comparator 41. Therefore, the terminal voltage Vb of the battery 1
When the voltage decreases, the power generation is started, and the exciting current can be intermittently controlled according to the low level value of the voltage Vo at the + input terminal of the comparator 41.

That is, the second voltage controller 4 controls the power generation regardless of the malfunction of the first voltage controller 3. Of course, the malfunction of the second voltage control device 4 does not affect the first voltage control device 3. Therefore, both generators 1 and 2 surely perform the synchronous operation in the normal state, and have an excellent effect of individually controlling the power generation when the communication signal line L1 is broken or one of the voltage control devices malfunctions.

(Modification) In the above embodiment, the battery B is used.
The voltage Vb of the high-level terminal of
However, in this modified mode, the output voltage of the generators 1 and 2 is divided in place of the voltage Vb, and the comparator 31 and
It is input to 41. Although the voltage values differ by the amount of the voltage drop from the three-phase full-wave rectifiers 15 and 25 to the battery B, the operation and the effect are the same.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention,

FIG. 2 is a circuit diagram of a first voltage control device,

FIG. 3 is a circuit diagram of a second voltage control device,

FIG. 4 is a circuit diagram of a voltage switching circuit,

FIG. 5 is a circuit diagram showing a modified mode,

[Explanation of symbols]

B is a battery, 1 is a first generator, 2 is a second generator, 3 is a first voltage control device, 4 is a second voltage control device, 5 is a key switch, and 6 is a voltage switching circuit (referred to as the first in the present invention). 2 setting voltage control means),

Claims (2)

[Claims] 1. A first power generator and a second power generator driven by an engine for charging a battery, and the first power generation based on a result of comparison between a voltage related to a terminal voltage of the battery and a predetermined first set voltage. A first voltage control device for intermittently controlling an exciting current of a machine, a voltage related to a terminal voltage of the battery, and a second voltage control device.
In a power generator including a second voltage controller that intermittently controls an exciting current of the second generator based on a comparison result with a set voltage, the second voltage controller is an exciting current of the first voltage controller. A second set voltage control means for increasing the second set voltage from a predetermined reference value when an energization command is issued, and decreasing the second set voltage from the reference value when an exciting current cutoff command of the first voltage control device is given. A power generation device characterized by. 2. The second setting voltage control means sets the reference value to the second setting when the signal line for transmitting the exciting current interrupting command signal of the second voltage control device to the first voltage control device is opened. The power generator according to claim 1, which is a voltage.