KR200222572Y1 - Power module protection device of automotive air conditioning system - Google Patents

Abstract

This proposal relates to a power module protection device for an automotive air conditioning system.

In order to drive the drive motor 3 for driving the blower 2 mounted in the initial stage of inflow into the air conditioning passage 1 as the operation logic circuit set in the inside of the driver's operation and the microcomputer M, the microcomputer ( A power module of an automotive air conditioner having a power module (D) comprising a drive motor (3) for receiving a drive signal from M) and a power transistor (TR) for driving the drive motor (3);

A poly switch PS is further provided between the collector C end of the power transistor TR and the negative terminal of the blower end, between the collector C end and the base B end of the power transistor TR. Further comprising a capacitor (CD) and a resistor (R) for discharge protection between the base (B) stage and the emitter (E) stage;

The current value applied to the polyswitch PS of the driving motor 3 is also increased, and the resistance value of the polyswitch PS rapidly increases above the limit value Lr of the polyswitch PS. ) Electrically cut off;

The power module protection device of the automotive air conditioner of the present invention has the usefulness to protect the power module even when the current is suddenly applied due to the short circuit of the driving motor.

Description

Power Module Protection Device of Automotive Air Conditioning Equipment

The present invention relates to a power module protection device for an automotive air conditioner, and more particularly, to a configuration for protecting a power module for a drive motor drive for driving a blower fan which is a rapid wind power source mounted on an automotive air conditioner.

The air conditioner of an automobile includes a blower and a blower driving motor for sucking external air into the air conditioning passage in the inlet portion of the air conditioning passage formed as a case body.

The blower driving motor has a control device in which a microcomputer, etc. is a main component, and a feedback structure for inspecting a voltage state of a power module and a current power module which are driven by receiving a strong and weak setting signal of wind speed by a driver's operation.

In the case of the power module described above, in the electrical configuration fed back by an electrical short circuit caused by a mechanical shock such as an external motor accident or an electric fault of the driving motor itself,

If a short circuit of the drive motor is triggered, a large amount of current is applied to the power module for the drive, resulting in overheating and destruction, resulting in improper operation of the air conditioner, as well as causing fire, and in case of repair of the replacement of the drive motor. A / S is difficult because the power module must be repaired together.

In view of the above problems, the power module protection device of the automotive air conditioner of the present invention is intended to be protected by preventing the application of over-current of the power module while simplifying the configuration by employing a current control element in case of abnormality. .

Power module protection device of the automotive air conditioning apparatus of the present disclosure for achieving the above object;

A drive motor and drive motor that receive a drive signal from the microcomputer to drive the drive motor that drives the blower mounted at the initial stage of inflow into the air conditioning passage as a predetermined operation logic circuit inside the driver's operation and the microcomputer. A power module of an automotive air conditioner having a power module composed of a power transistor for driving;

And a poly switch between the collector of the power transistor and the negative terminal of the blower.

The power module protection device of the automotive air conditioner of the present invention together with the accompanying drawings will be described in more detail.

1 is a block diagram of an air conditioning passage showing a motor in an air conditioner to which a power module protection device of an automotive air conditioner of the present invention is applied, and FIG. 2 is a power module unit to which a power module protection device of an automobile air conditioning device of the present invention is applied. Fig. 3 is a circuit diagram showing a state in which the power module protection device of the automotive air conditioner of the present application is applied, and Fig. 4 is a characteristic diagram of a polyswitch used in the power module protection device of the automotive air conditioning device of the present invention.

In FIG. 1, the blower 2 mounted on the inlet initial part into the air conditioning passage 1 is driven by the drive motor 3, and the driver's operation (not shown) and the inside of the micom M of FIG. It is driven as an operation logic circuit set in advance.

The typical drive motor control circuit of FIG. 2 is a power transistor for driving the drive motor 3 and the drive motor 3 receiving the operation signal from the microcomputer M receiving the air conditioner operation signal on the driver's seat panel. It is a conventional structure which has the power module D comprised by (TR).

As the above configuration;

Conventionally, when the resistance reaches "0" due to a short circuit of the driving motor 3, excessive current is applied to the power transistor TR, which may cause damage to the power module D and cause fire. .

The power module protection device of the automotive air conditioner of the present invention of FIG.

A poly switch PS is further provided between the collector C end of the power transistor TR and the negative terminal of the blower end.

A capacitor (CD) and a resistor (R) for discharge protection are further provided between the collector (C) end and the base (B) end of the power transistor (TR) and between the base (B) end and the emitter (E) end. do.

The polyswitch PS applied to the above shows a constant resistance value R1 with respect to the increase of current up to the limit value Lr as shown in the characteristic diagram of FIG. 4, but the resistance value is almost above the limit value Lr. It is a device having a current versus resistance characteristic that increases to infinity.

By constructing as above,

When the drive motor 3 is damaged, the current applied to the power transistor TR increases rapidly because the load resistance value of the drive motor 3 approaches "0",

Accordingly, the current value applied from the beginning to the poly switch PS is also increased in conjunction with each other. Above the predetermined limit value Lr, the resistance value of the poly switch PS increases rapidly, and the driving signal value from the microcomputer M is increased. The power module D is electrically protected by being cut off.

This has the same effect as issuing the drive OFF signal from the microcomputer (M).

That is, when the blower is abnormally operated and locked in the circuit shown in the drawing, the resistance component is only the resistance of the coil itself of the blower motor. Therefore, the collector-elector value of the transistor TR becomes almost the battery voltage value and the microcomputer (M). When the input signal is input from the (t) stage of the control panel, it is determined that the blower is turned off, thereby increasing the current at the base stage of the transistor TR, which increases the collector stage current.

At this time, the polyswitch PS between the blower and the transistor TR serves as a fuse to prevent the excessive current from flowing.

The polyswitch (PS) applied in this paper is made of carbon poly resin and exhibits carbon characteristics (conductor) below the limit value (Lr) current, but becomes a non-conductor when the current is exceeded.

The power module protection device of the automotive air conditioner of the present disclosure as described above has the utility to protect the power module even when the current is suddenly applied due to the short circuit of the driving motor.

1 is a configuration diagram in an air conditioning passage showing a motor in an air conditioning apparatus to which a power module protection device of a vehicle air conditioning apparatus of the present application is applied.

2 is a circuit diagram showing a power module unit to which the power module protection device of the automotive air conditioner of the present application is applied.

3 is a circuit diagram showing a state in which the power module protection device of the automotive air conditioner of the present application is applied.

4 is a characteristic diagram of a polyswitch used in a power module protection device of an automotive air conditioner of the present invention.

Explanation of symbols used in the main part of the drawing

1: air conditioning

2: blower

3: drive motor

M: Micom

TR: Power Transistor

PS: Polyswitch

Claims (1)

In order to drive the drive motor 3 for driving the blower 2 mounted in the initial stage of inflow into the air conditioning passage 1 as the operation logic circuit set in the inside of the driver's operation and the microcomputer M, the microcomputer ( A power module of an automotive air conditioner having a power module (D) comprising a drive motor (3) for receiving a drive signal from M) and a power transistor (TR) for driving the drive motor (3); A polyswitch (PS) polyswitch (PS) is further provided between the collector (C) end of the power transistor (TR) and the (-) terminal of the blower end, and the collector (C) end of the power transistor (TR) and the base ( B) further comprising a capacitor (CD) and a resistor (R) for discharge protection between stages and between base (B) stage and emitter (E) stage; The current value applied to the polyswitch PS of the driving motor 3 is also increased, and the resistance value of the polyswitch PS rapidly increases above the limit value Lr of the polyswitch PS. Power module protection device for an automobile air conditioning apparatus, characterized in that the electrical cutoff).