KR100221645B1 - Voltage regulator for permanent magnet type generator - Google Patents

Abstract

The present invention relates to a voltage regulating device for a permanent magnet type generator. The present invention relates to a voltage regulating device for a permanent magnet type generator, in which a generated voltage generated by driving a generator is rectified by a rectifier 90 composed of a diister and a diode and supplied to a load 10 and a battery BAT, A voltage detection unit 150 for detecting an abnormal voltage of the battery BAT and a control circuit unit 120 for outputting a gate signal to the thyristor of the rectifier 90 so as to adjust the output voltage of the generator. A voltage regulating device for a magnet type generator, comprising: a shunt resistor (131) for converting an amount of an output current of the battery (BAT) into a voltage drop component; A photocoupler 133 for electrically isolating an output signal from the differential amplifier IC13; a comparator 133 for comparing the voltage amplified by the differential amplifier IC13 with a predetermined reference voltage to detect an overcurrent Current sensing unit 130 consisting of a comparator (IC14); And a contactor 110 for disconnecting the power supplied from the rectifier 90 to the battery BAT and the load 10 by the control circuit unit 120 when an overcurrent is sensed by the current sensing unit 130. [ .

Description

Voltage regulator of permanent magnet generator

The present invention relates to a voltage regulating device for a permanent magnet type generator, and more particularly to a voltage regulating device for a permanent magnet type generator that can maintain a constant output voltage of a generator by detecting an abnormal voltage and an overcurrent of a battery will be.

FIG. 1 is a circuit diagram showing a voltage regulating device of a permanent magnet type generator according to the prior art. 1, in the voltage regulating device for a permanent magnet type generator according to the related art, the output signal from the voltage sense amplifying part 2, to which the voltage divided by the voltage divider 1 is applied, (-) of the comparator IC3 through the inverter 3 and the comparator IC3 generates a high or a low signal depending on the magnitude of the signal. That is, the voltage divided by the voltage divider 1 and applied to the variable resistor VR and the resistor R1 is provided as an input to the inverting terminal (-) of the amplifier IC1 of the voltage sensing amplifier 2. [ In this amplifier IC1, a constant reference voltage is always applied to the non-inverting terminal (+), so that the output of the difference between the two signals outputted from the two terminals (+, -) is outputted. The output signal from the amplifier IC1 also passes through the buffer IC2 for reducing the loading effect and is converted into a constant current by the resistor R2 which is used as the input signal of the photocoupler 3 And the input signal of this photocoupler 3 is provided as an input signal to the inverting terminal (-) of the comparator IC3. The comparator IC3 outputs a high signal when the signal inputted to the inverting terminal (-) is smaller than the reference voltage inputted to the non-inverting terminal (+) and the signal applied to the inverting terminal (- And outputs a low signal if it is larger than the reference voltage inputted to the input terminal.

First, when a high signal is outputted from the comparator IC3, the transistor Tr1 is turned on as a high signal is applied to the base terminal of the transistor Tr1, and the power supply current flows to the ground through the resistor R3. At this time, the output signal from the fixed frequency oscillator 4 is connected to the collector terminal of the transistor Tr2 via the resistor R4 to turn the transistor Tr2 on and off, and the transistor Tr3 is turned on and off according to the signal. The ON / OFF operation of the transistor Tr3 turns on / off the thyristor Thyr through the pulse transformer 5 to perform a rectifying operation.

On the other hand, when the low signal is outputted from the comparator IC3, the transistor Tr1 is turned off and the power supply current passes through the resistor R3 and the diode D1 connected to the collector terminal of the transistor Tr1 And turns on the transistor Tr2 as it is transmitted to the base of the transistor Tr2. As a result, the transistor Tr3 is turned off and no signal is transmitted to the thyristor Thy, so that the rectifying operation is not performed.

The above-described voltage regulating device for a permanent magnet type generator has the following problems. That is, if the load of the battery operates within the output of the permanent magnet type generator, no problem occurs. However, when the load exceeds the output of the permanent magnet type generator, the generator outputs the maximum output and discharging of the battery occurs. When the battery discharges, the output voltage falls below the specified voltage, and the constant voltage state can not be maintained. In addition, if the generator outputs a maximum output, there is a fear of generation of heat and damage to the generator, and if the heating state continues, the magnetism of the permanent magnet decreases and the output is lowered.

Therefore, it is required to limit the output voltage of the permanent magnet type generator to be kept within a certain range even if an overload state occurs.

Accordingly, it is an object of the present invention to provide a voltage regulating device for a permanent magnet type generator that can maintain the output voltage of a generator by detecting an abnormal voltage of the battery and an overcurrent of the battery to shut off the power.

1 is a circuit diagram showing a voltage regulating device of a permanent magnet generator according to a related art;

FIG. 2 is a block diagram of a voltage regulating device for a permanent magnet generator according to the present invention; FIG.

FIG. 3 is a detailed circuit diagram of the control circuit portion shown in FIG. 2; FIG.

FIG. 4 is a detailed circuit diagram of the voltage sensing unit shown in FIG. 2; FIG.

FIG. 5 is a detailed circuit diagram of the current sensing unit shown in FIG. 2; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: load 100: smoothing circuit

110: Contactor 120: Control circuit

130: current sensing unit 140: DC / DC converter unit

150:

It is an object of the present invention to provide a voltage generator for rectifying a generated voltage generated by driving a generator with a rectifier composed of a diister and a diode and supplying the same to a load and a battery, And a control circuit for outputting a gate signal to the thyristor of the rectifier so that the voltage can be controlled. The voltage regulating device of the permanent magnet generator includes a shunt resistor for converting the amount of the output current of the battery into a voltage drop, A photocoupler for electrically isolating the output signal of the differential amplifier; and a comparator for comparing the voltage amplified by the differential amplifier with a predetermined reference voltage to detect an overcurrent A current sensing unit comprising a comparator for comparing the current detected by the current sensor with a reference current; And a contactor for disconnecting the power supplied from the rectifier to the battery and the load by the control circuit unit when an overcurrent is sensed by the current sensing unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a voltage regulating device of a permanent magnet generator according to the present invention. As shown in FIG. 2, the rectifier 90 rectifies the output voltage of the generator by the diister and the diode, the smoothing circuit 100 that smoothens the voltage rectified by the rectifier 90, A current sensing unit 130 for sensing the current of the battery BAT to protect the circuit, the generator, and the engine when the current is overcurrent, and a control unit 130 for controlling the battery BAT when the battery BAT is over- A DC / DC converter unit 140 for supplying power to the control circuit unit 12, the current sensing unit 130, and the voltage sensing unit 150; And a contactor 110 which is turned off by a control signal of the load 120 to cut off the power applied to the load 10. [

FIG. 3 is a detailed circuit diagram showing a configuration of a control circuit according to the present invention; FIG. 3, the voltage of the battery BAT is divided by the variable resistor VR and the resistor R5 of the voltage divider 121 and is inverted by the inversion of the amplifier IC5 in the voltage- And is provided as an input signal to the input terminal (-). The amplifier IC5 always outputs a constant reference voltage to the non-inverting terminal (+) and outputs the difference between the two signals output from the two terminals (+, -). The output signal from the amplifier IC5 passes through the amplifier IC6 for reducing the load effect and is converted into a constant current by the resistor R6 and then the converted current is supplied to the photocoupler 123. [ Lt; / RTI > The photocoupler 123 transfers an output voltage having a value corresponding to the amount of the input current to the inverting terminal (-) of the comparator IC7. The reason why the output voltage of the amplifier IC5 is not directly supplied to the input of the comparator IC7 by using the photocoupler 123 is that the high voltage (several hundred V) and the internal voltage (5-12V) It is to electrically insulate completely.

The comparator IC7 outputs a high signal when the output signal of the photocoupler 123 inputted to the inverting terminal (-) is lower than the reference voltage inputted to the non-inverting terminal (+), while the high signal is outputted to the inverting terminal If the input signal is greater than the reference voltage input to the non-inverting terminal (+), a low signal is output.

A signal corresponding to the voltage difference between the input of the inverting terminal (-) of the comparator IC7 and the non-inverting terminal (+) to which the constant reference voltage is always applied is input to the base terminal of the transistor Tr4 do.

On the other hand, the fixed frequency oscillator 124 outputs a square wave signal having a constant frequency of 5-7 KHz, and this square wave signal is transmitted as a gate signal of a thyristor which is a rectifier. The minimum pulse width of the rectangular wave signal, that is, the duty cycle is selected in accordance with the gate turn-on holding time, and this rectangular wave signal is connected to the collector terminal of the transistor Tr5 through the resistor R7, So that the transistor Tr6 is turned off and transferred to the gate signal of the thyristor Thy, which is a rectifying element, through the pulse transducer 125 to perform a rectifying operation.

First, when the output of the comparator IC7 is low, the power source Vcc supplies current to the base terminal of the transistor Tr5 via the diode D2 through the collector terminal of the transistor Tr4 in the off state. The transistor Tr5 is turned on in response to the supply of the power supply current, so that no change occurs in the transistor Tr6. Accordingly, the rectifying operation is not performed because the pulse signal of the rectangular wave oscillator 124 is not transmitted to the gate of the thyristor Thy.

However, when the output of the comparator IC7 is high, the transistor Tr4 is turned on and the power supply current flows to the ground. Therefore, since the power supply current can not have any influence on the base terminal of the transistor Tr5, the square wave signal from the square wave oscillator 24 is transferred to the gate signal of the thyristor Thy and the rectifying operation is performed.

2, when the state of the load 10 is changed, the voltage of the battery BAT is instantaneously increased or decreased. At this time, an overcurrent and an abnormal voltage out of the control range of the control circuit can be generated. It is necessary to use a separate protection circuit for the protection of the internal circuit, the generator and the engine combined with the generator for this abnormal operating range.

In view of the above, according to the present invention, the abnormal voltage and the overcurrent of the battery (BAT) are sensed by using the voltage sensing unit 150 and the current sensing unit 130 of FIGS. 4 and 5 and the contactor 110 So that the output voltage of the generator is kept constant.

4 is a detailed circuit diagram of the voltage sensing unit according to the present invention. 4, the signal input to the voltage sensing unit 130 is input to the first to third comparison units 155, 157 and 158 (not shown) via the voltage divider 151, the voltage sense amplifier 152 and the photocoupler 153, (-) of the comparator (IC10-IC12). The comparator IC10 outputs a high or low state by comparing the voltage input to the inverting input terminal (-) with the first reference voltage input to the non-inverting input terminal (+). That is, when the voltage inputted to the inverting input terminal (-) is larger than the first reference voltage inputted to the non-inverting input terminal (+), that is, when the abnormal voltage of the battery deviates from the desired rectifying voltage is detected, the comparator . The transistor Tr7 is turned off by a low signal outputted from the comparator IC10 and the power supply current is outputted through the diode D3. This signal is sent to the control circuit unit 120 so that the thyristor of the rectifier 90 is cut off, so that the voltage of the battery BAT is lowered.

The comparator IC11 compares the voltage input to the inverting input terminal (-) with the second reference voltage, which is higher than the first reference voltage, so that the voltage of the battery BAT reaches a danger level far exceeding the prescribed voltage The contactor 110 is turned off to cut off the power supply. That is, the comparator IC11 turns off the contactor 110 through the contactor driving circuit 156 when the voltage input to the inverting input terminal (+) is higher than the second reference voltage input to the non-inverting terminal (+) . Accordingly, the contactor 110 cuts off the power supplied to the battery BAT.

The comparator IC12 compares the voltage input to the inverting input terminal (-) with a third reference voltage lower than the first reference voltage to detect a low voltage in a state where the voltage of the battery BAT is lower than the prescribed rectified voltage . That is, when the voltage input to the inverting input terminal (+) is lower than the third reference voltage input to the non-inverting terminal (+), the comparator IC12 outputs the voltage to the control circuit 120 through the terminal (a) And turns on the lamp through the terminal b so that the low voltage state of the battery BAT can be recognized.

5 is a detailed circuit diagram of the current sensing unit according to the present invention. 5, the output current of the battery BAT is lowered by the shunt resistor 131, and the weak voltage dropped by the shunt resistor 131 is amplified by the amplifier IC13, And is input to the inverting terminal (-) of the comparator IC14 and the comparator IC15 through the coupler 133. [

The comparator IC14 compares the voltage inputted to the inverting terminal (-) with the fourth reference voltage which is about 80% of the maximum power of the generator input to the non-inverting terminal (+) and outputs the signal to the control circuit unit 1 So that the amount of current flow to the battery (BAT) can be adjusted.

When the voltage input to the inverting terminal (-) is higher than the fifth reference voltage of the maximum limit value input to the non-inverting terminal (+), the comparator IC15 outputs a signal corresponding thereto to the voltage sensing unit 150, The power supply 110 is turned off to cut off the power supply.

As described above, according to the present invention, the rectifying operation is controlled so that the output voltage of the generator is kept constant according to the change of the voltage and the current. Especially, when the current sensing part detects that the output voltage of the generator is 80% On the other hand, when the maximum limit value is exceeded, the power supply is cut off, thereby preventing damage to the generator during overload.

Claims (1)

A voltage sensing unit 150 rectifying the generated power generation voltage of the generator by rectifier 90 consisting of a diistor and a diode and supplying the rectified voltage to the load 10 and the battery BAT and sensing an abnormal voltage of the battery BAT, And a control circuit unit (120) for outputting a gate signal to the thyristor of the rectifier (90) so as to control an output voltage of the generator (10), the apparatus comprising: A shunt resistor 131 for converting the amount of current into a voltage drop component; an amplifier IC13 for amplifying the voltage dropped by the shunt resistor 131; And a comparator IC14 (IC15) for comparing the voltage amplified by the differential amplifier IC13 with a predetermined reference voltage. And a contactor (110) for shutting off power supplied to the battery (BAT) and the load (10) when an overcurrent is sensed by the current sensing unit (130) Device.