KR100750775B1 - Apparatus for controling voltage of a vehicles generator - Google Patents

Abstract

Disclosed is a voltage generator apparatus for a vehicle generator which suppresses the instantaneous surge overvoltage generated during operation and stop, thereby improving the effect on the electrical equipment. The voltage control device for a vehicle generator includes load applied voltage detection means for supplying three-phase AC power generated from an armature coil to a storage battery and a load resistor through a diode performing full-wave rectification for each phase, and detecting a voltage applied to the load resistor; A feedback means for adjusting the amount of current flowing through the excitation coil by performing an opening / closing operation according to the level of the voltage detected by the load applying voltage detecting means, and detecting a voltage applied to the load applying voltage detecting means and comparing it with a reference voltage. And an instantaneous surge overvoltage detecting means for outputting a signal for an instantaneous surge overvoltage state, and corresponding to the rectifying means, and receiving a signal for the instantaneous surge overvoltage state, and receiving the battery from the rectifying means for each phase. Reduce the voltage applied to the load resistor to suppress the instantaneous surge overvoltage Provided with a means for suppressing over-voltage. Therefore, instantaneous surge voltage can be suppressed from occurring when the generator is operated or stopped in order to operate the electric equipment in a special vehicle in which a large capacity generator is used, and the instantaneous surge overvoltage is active according to the present invention. In addition, since it is made in real time, there is an effect that can prevent the failure of the electrical equipment and performance degradation due to the transient phenomenon.

Description

Apparatus for controling voltage of a vehicles generator}

1 is a circuit diagram showing a preferred embodiment of the voltage control device for a vehicle generator according to the present invention

Figure 2a is a waveform diagram showing the transient voltage generated in a typical vehicle generator

Figure 2b is a waveform diagram showing the transient voltage generated in the vehicle generator according to the embodiment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle generator, and more particularly, to a voltage generator of a vehicle generator which improves the effect on electrical components by suppressing the instantaneous surge overvoltage generated during operation and stoppage.

Usually, a lot of electrical equipment is comprised in a vehicle, and a generator is comprised as an apparatus which supplies electric power to the electrical equipment used for a vehicle. Generators are important components that directly affect the performance and lifespan of electrical equipment, depending on the safety of the power supply.

Recently, as the related technologies such as electricity and electronics develop, vehicles tend to be automated, and as the automation becomes more, the load of generators increases due to the increase in the number of electrical appliances using electricity.

In particular, in the case of a special vehicle such as a self-propelled artillery vehicle or a bullet-mounted vehicle, the load of the generator tends to increase rapidly since the electrical equipment is installed in consideration of the performance improvement.

In this trend, when the generator has a large load, the load current of the generator varies greatly during operation and shutdown, and instantaneous surge overvoltage is generated in the generator output voltage according to the response characteristic of the voltage, and the instantaneous surge overvoltage If it is applied to the electronics as it is, there is a problem that the performance of the electrical equipment is degraded or failure occurs.

In order to prevent this, a conventional overvoltage protector has been configured.

However, the conventional overvoltage protector is generally configured to protect the electronics through an overvoltage protection or voltage stabilization process by detecting an overvoltage and then feeding it back, in which case an effective protection operation can be achieved by the time delay characteristics of the detection and response circuit. There is no response at an acceptable level. Therefore, the conventional vehicle generator has a problem that the performance degradation or failure of the electrical components due to instantaneous surge overvoltage is not prevented.

An object of the present invention is to stabilize the instantaneous surge overvoltage caused by the transient phenomenon according to the response characteristics by changing the load current during the operation and stop of a large capacity generator for a vehicle to prevent failure and degradation of the electrical equipment.

Another object of the present invention is to prevent transient failure and performance degradation of electrical equipment by stabilizing the instantaneous surge overvoltage caused by the transient phenomenon in response to the transient phenomenon of a large capacity generator for vehicles to be active and in real time.

The voltage control device for a vehicle generator according to the present invention supplies a three-phase AC power generated from the armature coil to a storage battery and a load resistor through a diode performing full-wave rectification for each phase, and load is applied to detect a voltage applied to the load resistance. A feedback means for adjusting the amount of current flowing through the excitation coil by performing an opening and closing operation according to the level of the voltage detected by the voltage detecting means and the load applying voltage detecting means, and detecting a voltage applied to the load applying voltage detecting means Instantaneous surge overvoltage detection means for outputting a signal for an instantaneous surge overvoltage state compared to the reference voltage, and is configured to correspond to the rectifying means, and receives a signal for the instantaneous surge overvoltage state, rectifying means for each phase Instantaneous surge by reducing the voltage applied to the battery and load resistance from the Overvoltage suppression means for suppressing the overvoltage is provided.

Here, the instantaneous surge overvoltage detecting means includes a detecting means for detecting a voltage applied to the load applying voltage detecting means, and a constant voltage providing means composed of a zener diode for providing a reference voltage for comparing the voltage detected by the detecting means. The switching means may be configured to compare the voltages of the detection means and the constant voltage providing means, and the output means corresponding to each phase for transmitting the operation signal according to the switching state of the switching means to the overvoltage suppression means.

The overvoltage suppression means may be configured such that the thyristor and the dummy resistor are connected in series, and an operation signal output from the overvoltage detection means is applied as a detection signal of the thyristor.

In addition, the overvoltage state feedback means for detecting a voltage applied to each dummy resistor of the overvoltage suppression means and outputting a signal for the overvoltage suppression state to the feedback means may operate the feedback means.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the voltage control device for a vehicle generator according to the present invention will be described in detail.

The present invention is configured to detect a voltage applied to a load resistor configured in a voltage generator of a vehicle generator, and to suppress a voltage supplied to a storage battery and a load resistor when an instantaneous surge overvoltage of a predetermined level or more is detected. The instantaneous surge overvoltage caused by this is suppressed from being supplied to the storage battery and the load resistor.

To this end, the embodiment is configured as shown in FIG.

Referring to FIG. 1, first, the excitation coil L1 and the armature coil L2 are configured to supply three-phase AC power. The armature coil L2 is configured to supply current induced in the excitation coil L1 in three phases through a wiring connected for each phase.

In the output wiring for each phase of the armature coil L2, diodes D1, D2, and D3 for full-wave rectification are respectively configured, and diodes D1, D2, and D3 are connected in parallel to the storage battery Vc and the load resistor RL through a common node. One end of the excitation coil L1 is also connected to the common node.

The series resistors RD1 and RD2 are connected to the common node in parallel with the load resistor RL to detect a voltage applied to the load.

The comparator COM is configured to receive a voltage divided by the resistor RD2 through the resistor R16, and the comparator COM is configured to apply a constant voltage having a comparison reference level by the zener diode ZD1. In this case, the resistor R16 is preferably connected to the negative terminal of the comparator COM and the zener diode ZD1 is preferably configured to apply a constant voltage to the positive terminal.

Accordingly, the comparator COM is configured to apply the result of comparing the voltage applied across the gate to the gate of the transistor Q1, and the transistor Q1 switches the amount of current flowing through the excitation coil L2 while switching according to the level of the voltage applied to the gate. Configured to adjust.

On the other hand, diodes D11, D12, and D13 grounded in series with diodes D1, D2, and D3, which are subjected to full-wave rectification, are configured.

The thyristor SCR1 and a resistor R13 connected in series to the diode D11 are connected in parallel, and the detection terminal of the thyristor SCR1 is connected in series with a diode D4, a resistor R7, and a resistor R10 and a diode D7 connected in series. A node is formed between the resistor R10 and the diode D7 and is connected between the thyristor SCR1 and the resistor R13.

Similarly, the thyristor SCR2 and a resistor R14 connected in series with the diode D12 are connected in parallel, and the detection terminal of the thyristor SCR2 is connected with the diode D5 connected in series, the resistor R11 connected in series with the resistor R8, and the diode D8 in parallel. Then, a node is configured between the resistor R11 and the diode D8 to be connected between the thyristor SCR2 and the resistor R14.                     

In addition, the thyristor SCR3 and a resistor R15 connected in series to the diode D13 are connected in parallel, and the detection terminal of the thyristor SCR3 is connected in parallel with the diode D6 connected in series, the resistor R12 connected in series with the resistor R9, and the diode D9 in parallel. A node is formed between the resistor R12 and the diode D9 and connected between the thyristor SCR3 and the resistor R15.

Here, the diodes D7, D8, and D9 are configured to feed back the voltage applied to the resistor R13, which is a dummy resistor, to the comparator COM through the commonly connected diode D10 and the resistor R16.

On the other hand, the resistors R1 and R2 are configured to detect the voltage applied to the series resistors RD1 and RD2, and the voltage divided by the resistors R1 and R2 is configured to be applied to the gate of the transistor Q3, and the transistor Q3 is in accordance with the gate voltage level. Zener diode ZD2 that is turned on and off and provides a constant voltage to the emitter of transistor Q3 is constructed. Then, the resistor R3 connected to the emitter of the transistor Q3 is connected in parallel with the resistor R1. The collector of the transistor is connected to the gate of the transistor Q2 through the resistor R5, the resistor R4 connected in parallel to the resistor R3 is connected between the emitter and the gate of the transistor Q2, and the grounded resistor is connected to the collector of the transistor Q2. It is connected in parallel with each resistor R7, R8, R9 in common.

The operation and effects of the embodiment configured as described above will be described.

First, according to the embodiment, as the current is supplied to the excitation coil L1, the armature coil L2 induces three-phase alternating current to supply power for each phase through the diodes D1, D2, and D3. At this time, the diodes D1, D2, and D3 perform full-wave rectification.                     

The AC power source rectified in this manner is supplied to the storage battery Vc and the load resistor RL.

The power supplied to the load resistor RL is detected by the resistor RD1 and the resistor RD2 constituted by the load application voltage detection means, and the voltage applied to the resistor RD2 is applied to the comparator COM through the resistor R16.

Here, the comparator COM, the transistor Q1, the zener diode ZD1, and the resistor R16 are constituted by feedback means.

Since the comparator COM has a constant voltage applied by the zener diode ZD1, the comparator COM compares the constant voltage applied by the zener diode ZD1 with the detected voltage applied through the resistor R16.

Preferably, resistor R16 is connected to the negative terminal of the comparator COM. Therefore, when the generator is operated to increase the voltage, the increased voltage is detected by the resistors RD1 and RD2, and is applied to the negative terminal of the comparator COM through the resistor R16 to raise the potential. Therefore, the comparator COM outputs a low level signal to turn off the transistor Q1. On the contrary, when the voltage falls, the dropped voltage is detected by the resistors RD1 and RD2, and is applied to the negative terminal of the comparator COM through the resistor R16 to drop the potential. Therefore, the comparator COM outputs a high level signal to turn on the transistor Q1.

By the turn-on and turn-off action of the transistor Q1, a constant voltage is always supplied to the storage battery Vc and the load resistor RL.

On the other hand, when a transient surge overvoltage occurs during a transient phenomenon in which the load current is large when the generator is operated or stopped, the instantaneous surge overvoltage is applied to the resistors RD1 and RD2, where the instantaneous surge The ground overvoltage is detected by the resistors R1 and R2.

Here, the transistors Q2, Q3, zener diodes ZD2, resistors R1 to R9, diodes D4, D5, D6 are constituted by overvoltage detection means.

Therefore, the instantaneous surge overvoltage applied to the resistors R1 and R2 is applied to the gate of the transistor Q3, and the transistor Q3 compares the instantaneous surge overvoltage with the constant voltage of the zener diode ZD2 so that the instantaneous surge overvoltage exceeds a certain level. If it rises to over Vbe, it is operated. When the transistor Q3 is operated, the transistor Q2 is also operated in conjunction with it, and accordingly, a detection signal is applied to the detection terminals of the respective thyristors SCR1, SCR2 and SCR3 through the resistors R7, R8 and R9 and the diodes D4, D5 and D6.

As the overvoltage suppressing means, SCR1, SCR2, SCR3 and dummy resistors R13, R14, and R15 respectively connected thereto are constituted.

The detection signal serves as an operating power source for each of the thyristors SCR1, SCR2, and SCR3, and the thyristors SCR1, SCR2, and SCR3 are operated accordingly. Then, since the resistors R13, R14 and R15 respectively connected to the thyristors SCR1, SCR2 and SCR3 are connected to the diodes D1, D2 and D3, the instantaneous surge overvoltage is suppressed by the resistance values of the resistors R13, R14 and R15.

According to the operation of the thyristors SCR1, SCR2, and SCR3, the conventional instantaneous surge overvoltage which has a peak value as shown in FIG. 2A and affects the electrical equipment of the vehicle is suppressed as shown in FIG. 2B. Therefore, the electrical parts of the vehicle are prevented from being damaged by the instantaneous surge overvoltage.                     

On the other hand, when the diodes D7 to D10 are configured as overvoltage state feedback means, and the thyristors SCR1, SCR2, and SCR3 are operated, the voltages applied to the resistors R13, R14, and R15 are commonly connected to them through the diodes D7, D8, and D9. The voltage supplied to D10 and the diode D10 raises the negative terminal potential of the comparator COM via a resistor R16. Accordingly, the comparator COM outputs a low-level signal to stop the operation of the transistor Q1, and as the operation of the transistor Q1 is stopped, the current supplied to the excitation coil L1 is reduced to suppress an increase in the instantaneous surge overvoltage.

When the increase in the instantaneous surge overvoltage according to the above-described process is sufficiently suppressed, the current is normally supplied to the excitation coil L1, and a constant voltage is supplied to the storage battery Vc and the load resistor RL through the armature coil L2.

As described above, when the instantaneous surge overvoltage is generated, the overvoltage is actively and checked in real time, and the instantaneous surge overvoltage is suppressed.

Therefore, according to the present invention, the instantaneous surge voltage can be suppressed from being generated when the generator is operated or stopped to operate the electrical equipment in a special vehicle or the like in which a large capacity generator is used.

The instantaneous surge overvoltage is effective according to the present invention because the response is made in real time and can prevent failure and degradation of the electrical equipment caused by the transient phenomenon.

Claims (7)

In the voltage control device of a vehicle generator for controlling a three-phase AC power supplied to a storage battery and a load, Instantaneous surge overvoltage detection means for detecting a voltage applied to the load and outputting a signal for an instantaneous surge overvoltage condition compared to a predetermined reference voltage; Overvoltage suppression means for receiving a signal for the instantaneous surge overvoltage state and reducing the voltage applied to the storage battery and the load for each phase to suppress the instantaneous surge overvoltage from being applied to the storage battery and the load; Load applied voltage detecting means for detecting a voltage applied to the instantaneous surge overvoltage detecting means; And And a feedback means for performing an opening and closing operation according to the level of the voltage detected by the load application voltage detecting means to adjust the amount of current supplied to the storage battery. The method of claim 1, wherein the overvoltage suppression means A first switching element and a dummy resistor connected in series for each phase and operating the switching element according to an output signal of the instantaneous surge overvoltage detecting means. Voltage control device for a vehicle generator, characterized in that. The method of claim 2, wherein the overvoltage suppression means And an overvoltage state feedback means for detecting a voltage applied to each dummy resistor and outputting a signal for an overvoltage suppression state to the feedback means to operate a feedback means. The method according to any one of claims 1 to 3, The instantaneous surge overvoltage detection means Detection means for detecting a voltage applied to said load application voltage detection means; Constant voltage providing means for providing a reference voltage for comparing the voltage detected by said detecting means; Switching means for switching operation by comparing the voltage of said detecting means with said constant voltage providing means; And And an output means corresponding to each phase for transmitting an operation signal according to the switching state of the switching means to the overvoltage suppression means. The method of claim 4, wherein the switching means A second switching element for switching operation by comparing the voltage detected by the detection means with the voltage applied by the constant voltage providing means; And Wherein the third switching element voltage control apparatus for a vehicle generator which is characterized by having an output signal for controlling the operation through said output means be switched in association with the switching state of the second switching element. In the voltage control device of a vehicle generator for controlling a three-phase AC power supplied to a storage battery and a load, Instantaneous surge overvoltage detection means for detecting a voltage applied to the load and outputting a signal for an instantaneous surge overvoltage condition compared to a predetermined reference voltage; And It has a switching element and a dummy resistor connected in series for each phase and operates the switching element according to the output signal of the instantaneous surge overvoltage detection means to reduce the voltage applied to the storage battery and the load for each phase to reduce the instantaneous surge overvoltage A voltage generator apparatus for a vehicle generator comprising an overvoltage suppression means for suppressing the application to the storage battery and the load. The method of claim 6, wherein the overvoltage suppression means And overvoltage state feedback means for detecting a voltage applied to each dummy resistor and outputting a signal for an overvoltage suppression state.

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