KR102451714B1 - Special Vehicle Direct Current Motor Control System - Google Patents

Abstract

An embodiment of the present invention relates to a special vehicle direct current motor control system. A technical challenge is to provide the special vehicle direct current motor control system capable of protecting a direct current motor from overvoltage by including a voltage filter absorption circuit in a control power inlet unit when instantaneous overvoltage is introduced due to a failure of an alternator voltage adjusting device. The special vehicle direct current motor control system comprises: a motor power supply unit which supplies direct current power to the direct current motor; a power inlet protecting unit which blocks the overvoltage and overcurrent from the motor power supply unit; a sensing signal supply unit which supplies a temperature sensing signal of a cooled object; a direct current motor controlling unit which supplies power of the motor power supply unit to the direct current motor when the sensing signal from the sensing signal supply unit is higher than a reference level and blocks the power of the motor power supply unit from the direct current motor when the sensing signal is lower than the reference level; a PTO signal supply unit which supplies a power take-offs (PTO) operating or stopping signal of a vehicle; and a system power supply unit which supplies system power to the power inlet protecting unit and the direct current motor controlling unit when receiving the PTO operating signal from the PTO signal supply unit and blocks the system power from the power inlet protecting unit and the direct current motor controlling unit when receiving the PTO stopping signal.

Description

Special Vehicle Direct Current Motor Control System

An embodiment of the present invention relates to a DC motor control system for a vehicle constituting a specially-equipped vehicle by utilizing a power take-off (PTO) of a commercial vehicle.

The conventional DC motor control system for a specially equipped vehicle has a problem in that it is vulnerable to the electrical environment of the alternator (or generator) of the specially equipped vehicle.

Specially equipped vehicles using PTO utilize the power of the engine for a special purpose. In vehicles that frequently use excessive power, the device that controls the voltage of the engine alternator can easily fail, which causes the alternator’s high voltage to be connected to the battery. It will affect the battlefield equipment.

The conventional DC motor control system is always connected to the battery side regardless of whether the PTO is operating, so there is a risk of a battery discharge problem, a problem with the life of the DC motor, and a fire risk due to the inflow of high voltage applied when the voltage control device of the alternator fails There was a problem. For reference, as shown in FIGS. 1A and 1B , a portion of the wiring connecting the battery and the DC motor control circuit may be melted due to the introduction of a high voltage, and there is a possibility that a vehicle fire may occur due to the melting of the wiring.

The above-described information disclosed in the background technology of the present invention is only for improving the understanding of the background of the present invention, and thus may include information that does not constitute the prior art.

The problem to be solved according to an embodiment of the present invention is a special vehicle that can protect the DC motor from overvoltage by providing a voltage filter absorption circuit in the control power inlet when an overvoltage is instantaneously introduced due to a failure of the alternator voltage regulating device To provide a DC motor control system.

In addition, an object to be solved according to an embodiment of the present invention is to provide a DC motor control system for a specially equipped vehicle having a protection circuit to protect the control system from overvoltage or overcurrent in the DC motor control unit.

In addition, the problem to be solved according to the embodiment of the present invention is to extend the service life of the product by stopping the voltage supply of the DC motor control system when the use of the PTO is stopped, and to prevent the discharge of the battery. To provide a control system.

A DC motor control system for a specially equipped vehicle according to an embodiment of the present invention includes a motor power supply unit for supplying DC power to a DC motor; a power supply protection unit for blocking overvoltage and overcurrent coming from the motor power supply unit; a sensing signal supply unit for supplying a temperature sensing signal to a cooling target; When the sensing signal from the sensing signal supply unit is higher than the reference level, the power of the motor power supply is supplied to the DC motor, and when the sensing signal is lower than the reference level, the DC motor is cut off the power of the motor power supply. control unit; PTO signal supply unit for supplying a PTO (Power Take-Offs) operation or stop signal of the vehicle; and when a PTO operation signal is input from the PTO signal supply unit, system power is supplied to the power supply protection unit and the DC motor control unit, and when a PTO stop signal is input, the power supply protection unit and the DC motor control unit system power It may include a system power supply that allows it to be shut off.

The power supply protection unit may include: a first diode connected between a positive terminal of the motor power supply unit and a positive terminal of the system power supply unit; a first capacitor connected to a node between the first diode and a positive terminal of the system power supply and a node between a negative terminal of the motor power supply and a ground terminal of the system power supply; a second capacitor connected in parallel to the first capacitor; a second diode connected to a node between the first diode and a positive terminal of the system power supply and a node between a negative terminal of the motor power supply and a ground terminal of the system power supply; A base is connected to a node between the second diode and a ground terminal of the system power supply unit, a collector is connected to a node between the first and second diodes, and an emitter is connected to a node between the minus terminal and the ground terminal 1 transistor; and a base connected to the emitter of the first transistor and a node between the minus terminal and the ground terminal, a collector connected to a node between the first and second diodes, and an emitter connected to a node between the minus terminal and the ground terminal. It may include a second transformer to which the generator is connected.

The motor control unit may include: a first photo coupler that is turned on when the sensing signal input from the sensing signal supply unit is higher than a reference level and is turned off when the sensing signal is lower than the reference level; It is connected between the output side of the first photo coupler and the plus terminal and the ground terminal of the system power supply unit, and applies system power when the first photo coupler is turned on and cuts off the system power when the first photo coupler is turned off relay drive; and a power applying unit connected between the relay driving unit and the positive and negative terminals of the motor power supply unit to apply or cut off power to the DC motor.

The power supply unit may include: a relay switch connected between the positive terminal and the negative terminal of the DC motor power supply unit; a third diode connected in parallel to the relay switch; a fourth diode connected in parallel to the third diode; and a fourth capacitor connected in parallel to the fourth diode.

The relay driving unit may include: a relay coil connected to a node between the first photo coupler and a positive terminal of the system power supply unit and to the ground terminal to operate the relay switch; a fifth diode connected in parallel to the relay coil; a third capacitor connected in parallel to the relay coil and the fifth diode; a sixth diode connected between the relay coil and the ground terminal; A third transistor having a base connected to the emitter of the photo coupler, a collector connected to a node between the third capacitor and the fifth and sixth diodes, and an emitter connected to a node between the sixth diode and the ground terminal. ; and a fifth capacitor connected in parallel between the base and the emitter of the third transistor.

The system power supply unit includes: a seventh diode connected between the PTO signal supply unit and the ground terminal of the system power supply unit; a sixth capacitor connected in parallel to the seventh diode; and a second photo coupler having an input side connected in parallel to the seventh diode and the sixth capacitor and an output side connected to a positive terminal of the system power supply unit, the power input protection unit and the DC motor control unit, When a PTO operation signal is input from the PTO signal supply unit, the second photo coupler supplies the system power of the system power supply unit to the power input protection unit and the DC motor control unit, and when a PTO stop signal is input, the second photo coupler may prevent the system power of the system power supply unit from being supplied to the power input protection unit and the DC motor control unit.

An embodiment of the present invention provides a special-purpose DC motor control system capable of protecting the DC motor from overvoltage by providing a voltage filter absorption circuit in the control power inlet when an overvoltage is momentarily introduced due to a failure of an alternator voltage regulating device. do.

In addition, an embodiment of the present invention provides a DC motor control system for a specially equipped vehicle in which the DC motor control unit also has a protection circuit configured to protect the control system from overvoltage or overcurrent.

In addition, an embodiment of the present invention provides a DC motor control system for a specially equipped vehicle capable of extending the service life of the product by stopping the supply of voltage to the DC motor control system when the use of the PTO is stopped and preventing the battery from being discharged.

Accordingly, the embodiment of the present invention can prevent a fire in the DC motor control system and its peripheral devices, extend product life, and prevent battery discharge, thereby protecting assets and reducing maintenance costs for users of specially equipped vehicles.

1A and 1B are photographs illustrating a state in which a portion of a wiring connecting a battery and a DC motor control circuit is melted due to an inflow of a high voltage.
2 is a block diagram showing the configuration of a DC motor control system for a specially equipped vehicle according to an embodiment of the present invention.
3 is an exemplary circuit diagram of a power supply protection unit in a DC motor control system for a specially equipped vehicle according to an embodiment of the present invention.
4 is an exemplary circuit diagram of a DC motor control unit in a DC motor control system for a specially equipped vehicle according to an embodiment of the present invention.
5 is an exemplary circuit diagram of a system power supply unit in a DC motor control system for a specially equipped vehicle according to an embodiment of the present invention.

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

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these examples are provided so that this disclosure will be more thorough and complete, and will fully convey the spirit of the invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals in the drawings refer to the same elements. As used herein, the term “and/or” includes any one and any combination of one or more of those listed items. In addition, in the present specification, "connected" means not only when member A and member B are directly connected, but also when member A and member B are indirectly connected by interposing member C between member A and member B. do.

The terminology used herein is used to describe specific embodiments, not to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly dictates otherwise. Also, as used herein, “comprise, include” and/or “comprising, including” refer to the referenced shapes, numbers, steps, actions, members, elements and/or groups thereof. It specifies the presence and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers and/or parts, these members, parts, regions, layers, and/or parts are limited by these terms, so that It is self-evident that These terms are used only to distinguish one member, component, region, layer or portion from another region, layer or portion. Accordingly, a first member, component, region, layer, or portion discussed below may refer to a second member, component, region, layer or portion without departing from the teachings of the present invention.

2 is a block diagram illustrating the configuration of a DC motor control system 100 for a specially equipped vehicle according to an embodiment of the present invention.

As shown in FIG. 2 , the specially equipped DC motor control system 100 according to the embodiment of the present invention includes a motor power supply unit 110 , a power supply protection unit 120 , a sensing signal supply unit 130 , and a DC motor control unit. 140 , a DC motor 150 , a PTO signal supply unit 160 , and a system power supply unit 170 .

The motor power supply unit 110 may supply DC power to the DC motor 150 . In some examples, the motor power supply 110 may include or be referred to as a battery. In some examples, the motor power supply 110 may supply DC power of 12V or 24V to the DC motor 150 .

The power supply protection unit 120 may block various types of overvoltage and/or overcurrent that may be drawn in from the motor power supply unit 110 . In some examples, the power inlet protection unit 120 blocks/absorbs an overvoltage and/or an overcurrent higher than a preset reference level among DC power input from the motor power supply unit 110 and then provides a stable DC power supply to the DC motor 150 . can be supplied. In some examples, the power input protection unit 120 includes various voltage filters or absorption circuits, etc. to protect the DC motor 150 from when the alternator voltage regulator fails and instantaneous overvoltage is introduced. and this configuration will be described again below.

The sensing signal supply unit 130 may supply, for example, a temperature sensing signal to be cooled to the DC motor control unit 140 . In some examples, the sensing signal supply unit 130 may sense various temperatures of fluid, water, mechanical, electrical/electronic components, and the like, and provide a sensing signal related thereto to the DC motor control unit 140 . In some examples, the sensing signal supply 130 may include or be referred to as a thermo coupler.

When the sensing signal from the sensing signal supply unit 130 is higher than the reference level, the DC motor control unit 140 supplies the DC power from the motor power supply unit 110 to the DC motor 150 so that the DC motor 150 operates. can Also, the DC motor control unit 140 may cut off the DC power of the motor power supply unit 110 to the DC motor 150 when the sensing signal from the sensing signal supply unit 130 is lower than the reference level. That is, the DC motor control unit 140 operates or stops the DC motor 150 according to the sensing signal level from the sensing signal supply unit 130 . In some examples, the DC motor control unit 140 may also include a protection circuit to protect the DC motor control system 100 from overvoltage or overvoltage, which will be described again below.

The PTO signal supply unit 160 may supply a PTO (Power Take-Offs) operation or stop signal of the vehicle to the system power supply unit 170 . In some examples, the PTO signal supply unit 160 supplies the PTO operation signal to the system power supply unit 170 when the PTO of the vehicle operates so that the system power supply unit 170 is the power inlet protection unit 120 and/or the DC motor. The system power Vcc is supplied to the control unit 140 . In some examples, the PTO signal supply unit 160 supplies a PTO stop signal to the system power supply unit 170 when the PTO of the vehicle is stopped (ie, does not operate) so that the system power supply unit 170 is a power inlet protection unit Do not supply the system power Vcc to 120 and/or the DC motor control unit 140 . Therefore, in the embodiment of the present invention, the DC motor control system 100 is connected to the battery only when the PTO is operating and is disconnected from the battery when the PTO is stopped. In the event of a device failure, the risk of fire caused by the inflow of applied high voltage may be resolved.

When the PTO operation signal is input from the PTO signal supply unit 160, the system power supply unit 170 supplies the system power (Vcc) to the power supply protection unit 120 and the DC motor control unit 140, and the PTO signal supply unit ( When the PTO stop signal is input from 160 , the system power Vcc is cut off to the power supply protection unit 120 and the DC motor control unit 140 . Therefore, in the embodiment of the present invention, when the use of the PTO is stopped, the voltage supply of the DC motor control system 100 is also stopped, so that the service life of the product is extended and the battery discharge is prevented.

3 is an exemplary circuit diagram of the power input protection unit 120 of the DC motor control system 100 for a specially equipped vehicle according to an embodiment of the present invention. In some examples, the power supply protection unit 120 according to an embodiment of the present invention is a PTO signal terminal 1 (SIG_PTO) to which a PTO signal is input, a minus sensor terminal 2 to which a negative sensing signal is input (SENSOR -) , Positive sensor terminal (3) (SENSOR +) to which positive sensing signal is input, fan signal terminal (4) (FAN 1) to input fan signal, negative terminal (5) (24V-) to which negative DC power is supplied, It may further include a first terminal (P1) having a positive terminal (6) (24V) to which positive DC power is supplied.

As shown in FIG. 3 , the power supply protection unit 120 according to the embodiment of the present invention includes a first diode D1 , a first capacitor C1 , a second capacitor C2 , and a second diode D2 . , a first transistor Q1 and a second diode D2 may be included. In some examples, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R6 R7) may be further included.

The first diode D1 may have an anode connected to the plus terminal 6 of the first terminal P1 and a cathode connected to the plus terminal Vcc of the system power supply unit 170 . In some examples, the minus terminal 5 of the first terminal P1 may be connected to the ground terminal GND of the system power supply unit 170 . In some examples, a fourth resistor R4 may be further connected between the minus terminal 5 and the ground terminal GND.

In this way, the first diode D1 prevents current flow when the power of the positive terminal 6 of the first terminal P1 and the power of the ground terminal GND of the system power supply unit 170 are oppositely connected to the DC motor To protect the control system 100 . A first resistor R1 may be further connected between the first diode D1 and the positive terminal Vcc of the system power supply unit 170 .

The first capacitor C1 is a node between the cathode of the first diode D1 and the positive terminal Vcc of the system power supply 170 and the negative terminal 5 of the motor power supply 110 and the system power supply 170 ) may be connected to a node between the ground terminal GND. The second capacitor C2 may be connected in parallel to the first capacitor C1 .

In this way, the first and second capacitors C1 and C2 absorb and discharge a sudden change in power to maintain a constant power level.

The second diode D2 is a node between the cathode of the first diode D1 and the positive terminal Vcc of the system power supply 170 and the negative terminal 5 of the motor power supply 110 and the system power supply 170 ) may be connected to a node between the ground terminal GND. In some examples, the second diode D2 may have an anode connected to the ground terminal GND and a cathode connected to the plus terminal Vcc of the system power supply unit 170 . In some examples, a sixth resistor R6 may be further connected between the anode of the second diode D2 and the ground terminal GND.

In this way, when an overvoltage and/or overcurrent higher than the reference voltage and/or the reference current is introduced through the positive terminal 6 of the first terminal P1, the second diode D2 is connected to the first transistor Q1. The first transistor Q1 is turned on by applying an operating voltage between the base and emitter of

The first transistor Q1 may, in some examples, include a bipolar transistor, the base being connected to the node between the anode of the second diode D2 and the ground terminal GND of the system power supply 170 and , the collector may be connected to a node between the first and second diodes D1 and D2, and the emitter may be connected to a node between the minus terminal 5 of the first terminal P1 and the ground terminal GND. . In some examples, a third resistor R3 is further connected to the collector of the first transistor Q1, a fifth resistor R5 is further connected to the base of the first transistor Q1, and the first transistor Q1 A seventh resistor R7 may be further connected to the emitter of . Here, the third resistor R3 is connected to the node between the plus terminal 6 of the first terminal P1 and the plus terminal Vcc of the system power supply unit 170, and the fifth resistor R5 is the second It is connected to the node between the anode of the diode D2 and the sixth resistor R6, and the seventh resistor R7 is connected to the minus terminal 5 of the first terminal P1 and the ground terminal of the system power supply unit 170 ( GND) can be connected to a node between

In this way, the first transistor Q1 is turned on when an overvoltage and/or overcurrent higher than the reference voltage and/or the reference current is introduced through the plus terminal 6 of the first terminal P1, and the first terminal P1 is turned on. ) from the plus terminal 6 of the third resistor R3, the first transistor Q1 and the seventh resistor R7 to the minus terminal 5 of the first terminal P1 through the overvoltage and/or overcurrent By allowing it to flow, it is possible to protect the DC motor control system 100 .

The second transistor Q2, in some examples, may include a bipolar transistor, wherein the base is connected to the emitter of the first diode D1 and the collector is between the first and second diodes D1 and D2. It is connected to the node, and the emitter may be connected to the node between the minus terminal 5 of the first terminal P1 and the ground terminal GND. In some examples, the second resistor R2 is further connected to the collector of the second transistor Q2, and the seventh resistor R7 is connected to the base of the second transistor Q2 and the minus terminal (P1) of the first terminal P1. 5) can be connected to a node between

In addition, the third resistor R2 is connected to the node between the positive terminal 6 of the first terminal P1 and the positive terminal Vcc of the system power supply unit 170, and the emitter of the second transistor Q2 is It may be connected to a node between the minus terminal 5 of the first terminal P1 and the ground terminal GND of the system power supply unit 170 .

In this way, the second transistor Q2 is turned on together with the turn-on of the first transistor Q1, and thus the second resistor R2 and the second transistor Q2 from the positive terminal 6 of the first terminal P1. ), the overvoltage and/or overcurrent flows to the minus terminal 5 and/or the ground terminal GND of the first terminal P1 to protect the DC motor control system 100 .

Accordingly, the power input protection unit 120 of the DC motor control system 100 for a specially equipped vehicle according to an embodiment of the present invention, for example, when a high voltage voltage is instantaneously introduced due to a failure of the alternator voltage adjusting device, such The DC motor 150 may be protected from this by grounding the high voltage voltage.

4 is an exemplary circuit diagram of the DC motor control unit 140 in the specially equipped DC motor control system 100 according to an embodiment of the present invention. In some examples, the DC motor control unit 140 according to an embodiment of the present invention includes a positive sensor terminal 1 (SENSOR +) to which a positive sensing signal is input, and a system power terminal 2 (SW) to which a system power signal is input. POWER), and a second terminal P2 having a negative sensor terminal 3 (SENSOR -) to which a negative sensing signal is input may be further included.

As shown in FIG. 4 , the DC motor control unit 140 according to an embodiment of the present invention may include a first photo coupler U1 , a relay driving unit 141 , and a power applying unit 142 .

The first photo coupler U1 may include a light emitting element and a light receiving element corresponding thereto. In some examples, the first photo coupler U1 includes a tenth resistor R10 and a second sensor connected in series between the positive sensor terminal 1 of the second terminal P2 and the ground terminal GND of the system power supply unit 170 . The 12 resistor R12 may include a thirteenth capacitor C13 connected in parallel to the twelfth resistor R12, and the light receiving element of the first photocoupler U1 may be connected in parallel to the twelfth resistor R12. have.

The relay driver 141 may include a relay coil RC, a fifth diode D5, a third capacitor C3, a sixth diode D6, and a third transistor Q3. The relay coil RC may be connected between the node between the light receiving element of the first photocoupler U1 and the positive terminal Vcc of the system power supply 170 and the ground terminal GND.

The fifth diode D5 may be connected in parallel to the relay coil RC. In some examples, the anode of the fifth diode D5 may be connected to the ground terminal GND and the cathode of the fifth diode D5 may be connected to the positive terminal Vcc of the system power supply unit 170 .

The third capacitor C3 may be connected in parallel to the relay coil RC and the fifth diode D5. In some examples, the ninth resistor R9 may be connected between the third capacitor C3 and the anode of the fifth diode D5.

The sixth diode D6 may be connected between the relay coil RC and the ground terminal GND. In some examples, the anode of the sixth diode D6 may be connected to the ground terminal GND and the cathode of the sixth diode D6 may be connected to the relay coil RC. In some examples, an eleventh resistor R11 may be further connected between the sixth diode D6 and the relay coil RC.

The third transistor Q3 has a base connected to the light receiving element of the first photocoupler U1, and a collector connected to a node between the third capacitor C3 and the fifth and sixth diodes D5 and D6, and the is connected to a node between the light receiving element of the first photocoupler U1, the sixth diode D6, and the ground terminal GND.

The fifth capacitor C5 may be connected in parallel between the base and the emitter of the third transistor Q3 . In some examples, a fourteenth resistor R14 may be further connected to the fifth capacitor C5 in parallel.

In this way, the first photo coupler U1 may be turned on/off according to a sensing call received from the sensing signal supply unit 130 . In some examples, the sensing signal received from the sensing signal supply unit 130 may be instantaneously turned on/off, and when the generated instantaneous current flows into the control system 100 , the circuit may be damaged. Accordingly, in the present embodiment, a first photo coupler U1 is provided between the sensing signal supply unit 130 and the relay driving unit 141 , and the instantaneous current generated according to the on/off signal of the sensing signal supply unit 130 is introduced. By blocking the circuit, it is possible to protect the circuit of the control system 100 . Furthermore, since the thirteenth capacitor C13 is connected in parallel to the twelfth resistor R12, the change in voltage dividing resistance applied to the tenth and twelfth resistors R10 and R12 is reduced, thereby reducing current noise.

On the other hand, the signal output from the light receiving element of the first photocoupler U1 is input to the base of the third transistor Q3, and this third transistor Q3 is connected to the positive terminal Vcc of the system power supply unit 170 and It is installed between the ground terminal GND and may be turned on/off according to a signal output through the light receiving element of the first photo coupler U1 . The relay may transmit the power of the motor power supply 110 to the DC motor 150 according to the on/off operation of the first photo coupler U1 .

In some examples, the relay may include a relay coil RC and a switch K1. Since the fifth diode D5 and the third capacitor C3 are connected in parallel to the relay coil RC, electrical noise may be removed during on/off operation of the relay. In some examples, when the first photocoupler U1 is turned on, the third transistor Q3 is turned on, and accordingly, a current flows in the relay coil RC. That is, a current flows from the positive terminal (Vcc) of the system power supply unit 170 to the ground terminal (GND) through the relay coil (RC) and the third transistor (Q3), and eventually the relay switch ( K1) is turned on.

In other words, when the first photocoupler U1 receives a signal above the reference level from the sensing signal supply unit 130, the third transistor Q3 is turned on through the first photocoupler U1, and accordingly, the relay coil ( RC) and the third transistor Q3 , power is supplied through the positive terminal Vcc of the system power supply unit 170 to turn on the relay switch K1 of the motor power application unit 142 .

Meanwhile, the power applying unit 142 may include a third diode D3 , a fourth diode D4 , and a fourth capacitor C4 . The third diode D3 is connected between the positive terminals 6 and 24V and the negative terminals 5 and 24V- of the motor power supply unit 110, and between the positive terminal 6 and the third diode D3. A relay switch K1 may be connected. In some examples, the anode of the third diode D3 may be connected to the negative terminal 5 and the cathode of the third diode D3 may be connected to the positive terminal 6 . The fourth diode D4 may be connected in parallel to the third diode D3. That is, the anode of the fourth diode D4 may be connected to the anode of the third diode D3 , and the cathode of the fourth diode D4 may be connected to the cathode of the third diode D3 .

In addition, the fourth capacitor C4 may also be connected in parallel to the third and fourth diodes D3 and D4. In some examples, an eighth resistor R8 may be further connected between the cathode of the fourth diode D4 and the fourth capacitor C4. In some examples, the DC motor 150 may be connected in parallel to the eighth resistor R8 and the fourth capacitor C4.

In this way, the power applying unit 142 applies power to the DC motor 150 and at the same time, due to the third and fourth diodes D3 and D4 and the fourth capacitor C4, which may be generated when the DC motor is driven. Reverse surge voltage and inrush current can be suppressed.

As a result, the DC motor control unit 140 also has a protection circuit to protect the control system 100 from overvoltage or overcurrent.

5 is an exemplary circuit diagram of the system power supply unit 170 of the DC motor control system 100 for a specially equipped vehicle according to an embodiment of the present invention.

As shown in FIG. 5 , the system power supply unit 170 may include a seventh diode D7 , a sixth capacitor C6 , and a second photo coupler U2 .

The seventh diode D7 may be connected between the PTO signal supply unit 160 and the ground terminal GND of the system power supply unit 170 . In some examples, the anode of the seventh diode D7 may be connected to the ground terminal GND, and the cathode of the seventh diode D7 may be connected to the PTO signal supply unit 160 . In some examples, a fifteenth resistor R15 may be further connected between the cathode of the seventh diode D7 and the PTO signal supply unit 160 . The sixth capacitor C6 may be connected in parallel to the seventh diode D7. In some examples, the seventeenth resistor R17 may be connected in parallel to the sixth capacitor C6. The light receiving element of the second photo coupler U2 may be connected in parallel to the seventh diode D7 , the sixth capacitor C6 , and the seventeenth resistor R17 . In this way, when an operation signal is input from the PTO signal supply unit 160, the second photo coupler U2 is turned on, and when a stop signal is input from the PTO signal supply unit 160, the second photo coupler U2 is turned off. have. Here, the voltage applied to the light receiving element of the second photocoupler U2 is stabilized by the seventh diode D7, the sixth capacitor C6, and the seventeenth resistor R17, so that a malfunction can be prevented.

On the other hand, the positive terminal Vcc of the system power supply unit 170 is connected to the light receiving element of the second photo coupler U2, and the power supply protection unit 120 and the DC motor control unit 140 are connected to the positive terminal Vcc. ) can be connected in parallel. In some examples, a sixteenth resistor R16 may be further connected between the positive terminal Vcc and the power line SW POWER.

In this way, the system power Vcc may be applied to the power supply protection unit 120 and the DC motor control unit 140 through the collector and the emitter among the light receiving elements of the second photo coupler U2 . Accordingly, when the second photo coupler U2 is turned off, the system power is not supplied to the power supply protection unit 120 and the DC motor control unit 140, so the operation is stopped, and when the second photo coupler U2 is turned on Power is supplied to the system to operate the power supply protection unit 120 and the DC motor control unit 140 .

In other words, when the use of the PTO is stopped, the voltage supply of the DC motor control system 100 is also stopped, so that the service life of the product is extended and the discharge of the battery can be prevented. In FIG. 4 , a third terminal (P3: PTO OFF 1) connected to the power input protection unit 120 and a fourth terminal (P4: PTO OFF 2) connected to the DC motor control unit 140 are shown.

In this way, the embodiment of the present invention prevents the fire of the DC motor control system 100 and its peripheral devices, extends the product life, and prevents battery discharge, thereby reducing the asset protection and maintenance cost of the special vehicle user. can

What has been described above is only one embodiment for implementing the DC motor control system for a specially equipped vehicle according to the present invention, and the present invention is not limited to the above embodiment, and as claimed in the claims below, the present invention Without departing from the gist, it will be said that the technical spirit of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the invention pertains.

100; Special Vehicle DC Motor Control System
110; motor power supply
120; power entry protection
130; sensing signal supply
140; DC motor control unit
150; DC motor
160; PTO signal supply
170; system power supply

Claims (6)

a motor power supply unit for supplying DC power to the DC motor;
a power supply protection unit for blocking overvoltage and overcurrent coming from the motor power supply unit;
a sensing signal supply unit for supplying a temperature sensing signal to a cooling target;
When the sensing signal from the sensing signal supply unit is higher than the reference level, the power of the motor power supply is supplied to the DC motor, and when the sensing signal is lower than the reference level, the DC motor is cut off the power of the motor power supply. control unit;
PTO signal supply unit for supplying a PTO (Power Take-Offs) operation or stop signal of the vehicle; and
When a PTO operation signal is input from the PTO signal supply unit, system power is supplied to the power supply protection unit and the DC motor control unit. When a PTO stop signal is input, the system power is supplied to the power supply protection unit and the DC motor control unit. a system power supply to be shut off;
The motor control unit
a first photo coupler turned on when the sensing signal input from the sensing signal supply unit is higher than a reference level and turned off when the sensing signal is lower than the reference level;
It is connected between the output side of the first photo coupler and the plus terminal and the ground terminal of the system power supply unit, and applies system power when the first photo coupler is turned on and cuts off the system power when the first photo coupler is turned off relay drive; and
and a power applying unit connected between the relay driving unit and the positive and negative terminals of the motor power supply unit to apply or cut off power to the DC motor.
The method of claim 1,
The power inlet protection unit
a first diode connected between the positive terminal of the motor power supply and the positive terminal of the system power supply;
a first capacitor connected to a node between the first diode and a positive terminal of the system power supply and a node between a negative terminal of the motor power supply and a ground terminal of the system power supply;
a second capacitor connected in parallel to the first capacitor;
a second diode connected to a node between the first diode and a positive terminal of the system power supply and a node between a negative terminal of the motor power supply and a ground terminal of the system power supply;
A base is connected to a node between the second diode and a ground terminal of the system power supply unit, a collector is connected to a node between the first and second diodes, and an emitter is connected to a node between the minus terminal and the ground terminal 1 transistor; and
A base is connected to the emitter of the first transistor, a node between the minus terminal and the ground terminal, a collector is connected to a node between the first and second diodes, and an emitter is connected to a node between the minus terminal and the ground terminal. Including a second transformer connected to the, specially equipped vehicle DC motor control system. delete The method of claim 1,
The power supply unit
a relay switch connected between the positive terminal and the negative terminal of the DC motor power supply;
a third diode connected in parallel to the relay switch;
a fourth diode connected in parallel to the third diode; and
and a fourth capacitor connected in parallel to the fourth diode. 5. The method of claim 4,
The relay driver
a relay coil connected to a node between the first photo coupler and a positive terminal of the system power supply unit and the ground terminal to operate the relay switch;
a fifth diode connected in parallel to the relay coil;
a third capacitor connected in parallel to the relay coil and the fifth diode;
a sixth diode connected between the relay coil and the ground terminal;
A third transistor having a base connected to the emitter of the photo coupler, a collector connected to a node between the third capacitor and the fifth and sixth diodes, and an emitter connected to a node between the sixth diode and the ground terminal. ; and
and a fifth capacitor connected in parallel between the base and the emitter of the third transistor. The method of claim 1,
The system power supply
a seventh diode connected between the PTO signal supply unit and the ground terminal of the system power supply unit;
a sixth capacitor connected in parallel to the seventh diode; and
a second photo coupler having an input side connected in parallel to the seventh diode and the sixth capacitor, and an output side connected to a positive terminal of the system power supply unit, the power input protection unit, and the DC motor control unit,
When a PTO operation signal is input from the PTO signal supply unit, the second photo coupler supplies the system power of the system power supply unit to the power input protection unit and the DC motor control unit, and when a PTO stop signal is input, the second photo coupler prevents the system power of the system power supply unit from being supplied to the power inlet protection unit and the DC motor control unit.

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