JP2007153133A - On-vehicle electric device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle electric device which can allows any non-on-vehicle functional elements and driving means for driving the elements function correctly even when they are built therein. <P>SOLUTION: A main fan driving circuit 20 (a main driving means) which receives power supply from an on-vehicle power source 50 to drive a main fan motor 10 has a protective circuit 60 for protecting: an auxiliary fan motor 20 of an auxiliary fan device 2; and an auxiliary fan driving circuit 40 for driving the motor 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a plurality of functional elements, and a vehicle-mounted electrical apparatus that is provided corresponding to each of the plurality of functional elements, and that has a plurality of drive units that receive power supplied from the vehicle-mounted power source and drive the functional elements. About.

Patent Document 1 discloses a vehicle air conditioner that includes a main fan device that blows out mainstream wind and an auxiliary fan device that blows out sidestream wind as a fan device for blowing out conditioned air into the passenger compartment. This is because airflow that is weaker than the mainstream wind is blown intermittently in a direction different from the mainstream wind by the auxiliary fan device, creating a fluctuation wind that is close to the natural wind, and is comfortable for passengers. It is intended to provide a sense.
JP-A-6-117657

  By the way, since the substream wind to be blown out by the auxiliary fan device may be relatively weak, a low-capacity fan device is used. Focusing on this, it is considered that what is used for household appliances etc. for general purposes is used as this auxiliary fan device. The cost can be reduced compared to the above.

  This is because a general-purpose device is assumed to be used for various products, so that it has a configuration in which a fan, a fan motor (functional element), and a drive circuit (drive means) for driving the fan are provided. Because there are many. In other words, assuming that the product is used in various products, the protection circuit and the like necessary for operating the fan are different for each product, so that the minimum configuration is maintained and the cost is low.

  However, when a general-purpose fan device is actually mounted on a vehicle and used, a protection circuit is not provided, and this fan device and other in-vehicle devices may adversely affect each other. Specifically, it is conceivable that a surge voltage generated in other in-vehicle equipment or the like enters the fan device 2 or reverse voltage is applied by reversely connecting a power cable to the in-vehicle power source. Furthermore, it is conceivable that noise generated from the fan device leaks to the outside.

  Therefore, it is conceivable to add a protection circuit made up of a constant voltage diode or the like to the drive circuit to overcome the above problems, but since this situation is unexpected, the space for mounting the Zener diode is not enough. Not provided.

  The present invention has been made in view of the above circumstances, and provides an in-vehicle electrical device that can function normally even if a non-in-vehicle functional element and a driving means for driving the non-in-vehicle functional element are incorporated. That is.

  In order to achieve the above object, according to the first aspect of the present invention, a plurality of functional elements and a plurality of functional elements are provided corresponding to the plurality of functional elements, respectively, and receive the power supply from the in-vehicle power source to drive the functional elements. In the in-vehicle electric apparatus including the driving unit, the plurality of driving units include a main driving unit and a sub driving unit, and the main driving unit includes a driving circuit that drives corresponding functional elements, a sub driving unit, and a sub driving unit. And a protection circuit for protecting the functional element driven by the means.

  According to the first aspect of the present invention, the main drive means is provided with a protection circuit for protecting the sub drive means and the functional elements associated with the sub drive means. When a non-vehicle functional element that is not supposed to be mounted on a vehicle is to be mounted on the vehicle and used, the driving means that drives the non-vehicle functional element is used as a sub-driving means. Just do it.

  As a result, the non-vehicle function elements and the driving means for driving them are protected by the protection circuit for the main driving means. For this reason, it is not necessary to add a protection circuit to a non-vehicle function element or a drive circuit that drives the functional element, and even if there is a situation where it is difficult to add a protection circuit to these, it is mounted on a vehicle. And can be used normally.

  According to a second aspect of the present invention, the protection circuit is connected to the in-vehicle power source via a backflow prevention diode connected in a forward direction to the in-vehicle power source, and supplies power to the driving means at a predetermined voltage. It is characterized by comprising a constant voltage circuit that performs the above.

  According to the invention of claim 2, intrusion of surge voltage generated in other in-vehicle devices by the constant voltage circuit and application of reverse voltage due to reverse connection of the power cable to the in-vehicle power source are prevented, Noise generated from the sub driving means or the functional elements driven by the sub driving means is prevented. For this reason, it is possible to prevent the sub-driving means, the functional elements driven by the sub-driving means, and other functional elements from being adversely affected.

  According to a third aspect of the present invention, the constant voltage circuit includes a transistor connected in an emitter-follower type to the on-vehicle power supply, and a voltage holding circuit that holds the base voltage of the transistor at a predetermined voltage. It is said.

  According to this, since the base potential of the transistor is held at a predetermined voltage by the voltage holding circuit, it is possible to supply power to the sub-driving unit with the predetermined voltage. Further, since the transistor is connected in an emitter-follower type, the current capacity of the voltage holding circuit can be reduced.

  According to a fourth aspect of the present invention, the constant voltage circuit includes a field effect transistor connected in a source follower type with respect to the on-vehicle power supply, and a voltage holding circuit that holds the gate voltage of the field effect transistor at a predetermined voltage. It is characterized by being.

  According to this, since the gate potential of the field effect transistor is held at a predetermined voltage by the voltage holding circuit, it is possible to supply power to the sub-driving means at a predetermined voltage. In addition, since the field effect transistor is connected in a source follower type, the current capacity of the voltage holding circuit can be reduced.

  According to a fifth aspect of the present invention, the voltage holding circuit includes a series circuit of a resistance element and a constant voltage diode, and a common connection point thereof is connected to a base terminal of the transistor. According to a sixth aspect of the present invention, the voltage holding circuit comprises a series circuit of a resistance element and a constant voltage diode, and these common connection points are connected to the gate terminal of the field effect transistor. Yes. Thereby, a constant voltage can be generated with a relatively simple configuration.

  The invention of claim 7 is characterized in that a plurality of constant voltage diodes are connected in series. Thereby, each constant voltage diode can be made into a thing of a low proof pressure, and the noise output can be reduced.

<First Embodiment>
An embodiment in which an in-vehicle electric device according to the present invention is applied to a fan device used in a vehicle air conditioner will be described with reference to FIG. 1 or FIG. The fan device according to the present embodiment is used for so-called seat air conditioning in which conditioned air is blown from the inside of a seat, and includes a main fan device 1 and an auxiliary fan device 2.

  The main fan device 1 is provided corresponding to the main fan motor 10 (functional element) that operates the main fan 1A and the fan motor 10 and receives the power supply from the in-vehicle power supply 50 to drive the main fan motor 10. The auxiliary fan device 2 is provided corresponding to the auxiliary fan motor 30 (functional element) for operating the auxiliary fan 2 </ b> A and the fan motor 30. The auxiliary fan driving circuit 40 (sub driving means) that drives the auxiliary fan motor 30 upon receiving power supply from the in-vehicle power source 50 is provided.

  The main fan motor 10 is mainly used when air-conditioning air is blown out, and is composed of, for example, a three-phase AC motor. The fan motor 10 includes hall sensors 11 to 13 for detecting the rotor rotational position, and transmits a detection signal to a drive control circuit 23 described later.

  The main fan drive circuit 20 includes an inverter circuit 21 that drives the main fan motor 10, a noise response circuit 22 that removes noise generated from the inverter circuit 21, a drive control circuit 23 that controls the inverter circuit 21, and an auxiliary fan. The driving circuit 40 includes a protection circuit 60 for protecting the drive circuit 40, and both operate upon receiving power supply from the in-vehicle power supply 50.

  Among them, the inverter circuit 21 is formed by connecting, for example, six FETs as shown in FIG. 1, and by switching each FET based on the gate control signal from the drive control circuit 23, three-phase AC power is generated. This is generated and supplied to the stator coil of the main fan motor 10. The drive control circuit 23 outputs a gate control signal to the inverter circuit 21 based on the detection signals from the hall sensors 11 to 13 and the speed control signal S from the outside, so that the rotation speed of the main fan motor 10 is a predetermined value. Control to achieve the rotation speed.

  The auxiliary fan motor 30 is used auxiliary when the air-conditioning air is blown out, and is constituted by, for example, a DC motor. The auxiliary fan motor 30 has a built-in hall sensor 31 for detecting the rotor rotational speed.

  The auxiliary fan drive circuit 40 controls the rotation speed of the auxiliary fan motor 30 so as to become a predetermined rotation speed based on the speed control signal S from the outside and the detection signal of the hall sensor 31. The auxiliary fan motor 30 and the auxiliary fan drive circuit 40 operate by receiving power supply from the in-vehicle power supply 50 via the protection circuit 60 provided in the main fan drive circuit 20.

  A power switch 70 is provided between the drive circuits 20 and 40 and the in-vehicle power supply 50 so that the on / off switching can be performed manually or automatically.

  Incidentally, the protection circuit 60 is provided in the main fan drive circuit 20 as described above, and supplies power from the in-vehicle power supply 50 to the auxiliary fan drive circuit 40. As shown in FIG. 2, the configuration includes a backflow prevention diode 610 forward-connected to the in-vehicle power supply 50 and a constant voltage circuit 620 connected to the in-vehicle power supply 50 via the backflow prevention diode 610. .

  This prevents surge voltage from entering the auxiliary fan device 2 and application of reverse voltage due to the reverse connection of the power cable to the in-vehicle power supply 50, and noise generated from the auxiliary fan device 2 may leak to the outside. Is prevented. For this reason, it is possible to prevent the auxiliary fan device 2 and other in-vehicle devices from adversely affecting each other.

  The constant voltage circuit 620 includes an NPN transistor 621 connected in an emitter-follower type to the in-vehicle power supply 50, and a voltage holding circuit 622 that holds the base voltage of the transistor 621 at a predetermined voltage. .

  More specifically, the transistor 621 is connected in series to the reverse current blocking diode 610, and the resistor 622A that is the voltage holding circuit 622 and the constant current are connected between the connection point between the reverse current blocking diode 610 and the transistor 621 and the ground GND. A series circuit 622 of the voltage diode 622B is connected, and a common connection point of the resistance element 622A and the constant voltage diode 622B is connected to the base terminal of the transistor 621. The constant voltage diode 622B is reversely connected to the in-vehicle power supply 50 so that a reverse voltage is applied.

  As described above, since the power is supplied to the in-vehicle power supply 50 by the transistor 621 connected in an emitter follower type, the current capacity of the resistance element 622A and the constant voltage diode 622B constituting the voltage holding circuit 622 is reduced. Can do.

  In the present embodiment, the main fan drive circuit 20 is provided with a protection circuit 60 for protecting the auxiliary fan device 2. Therefore, when it is desired to use a non-vehicle fan device that is not supposed to be mounted on a vehicle, the protection circuit 60 provided in the main fan drive circuit 20 is connected to the auxiliary fan drive circuit 40. You should do it.

  Thereby, since the auxiliary fan device 2 is protected by the protection circuit 60 provided in the main fan drive circuit 20, even if there is a situation where it is difficult to add a protection circuit to the auxiliary fan drive circuit 40, It can be mounted on a vehicle and used normally.

  Here, as the auxiliary fan device 2, for example, if a general-purpose device used for various electrical appliances or the like is applied to the present embodiment, the cost can be reduced as compared with the case where a dedicated device for a vehicle air conditioner is used. be able to. This is because the general-purpose type is assumed to be used for various products, and is often configured by simply providing a drive circuit for driving the fan body. In other words, assuming that it is used for various products, the protection circuit required when operating the fan is different for each product, so it is kept in a minimum configuration. This is because it is relatively inexpensive compared to the one used.

<Second Embodiment>
A second embodiment according to the present invention will be described with reference to FIG. The present embodiment relates to a vehicle oxygen enrichment apparatus. An oxygen enrichment device is a device that generates oxygen-enriched air by increasing the oxygen concentration of inhaled air, and blows out this oxygen-enriched air into the passenger compartment. A vacuum pump for inhaling and blowing out air A device 100 and a fan device 200 are provided.

  As shown in FIG. 3, the vacuum pump device 100 is provided corresponding to a pump motor 110 (functional element) that operates the pump 100 </ b> A and the pump motor 110. A pump drive circuit 120 (main drive means) for driving 110 is provided.

  On the other hand, the fan device 200 is provided corresponding to the fan motor 230 (functional element) that operates the fan 200A and the fan motor 230, and is driven by a fan that drives the fan motor 230 by receiving power supply from the in-vehicle power supply 50. The circuit 240 (sub driving means) is provided.

  Here, each component corresponds to each component in the above embodiment. That is, the pump motor 110 corresponds to the main fan motor 10, the pump drive circuit 120 corresponds to the main fan drive circuit 20, the fan motor 230 corresponds to the auxiliary fan motor 30, and the fan drive circuit 240 corresponds to the auxiliary fan drive circuit 40.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  The protection circuit 60 of the above embodiment may be configured as shown in FIGS. That is, as shown in FIG. 4, a field effect transistor 630 connected in a source follower type to the in-vehicle power supply 50 may be used instead of the transistor 621. Even if it does in this way, the effect similar to the said embodiment is acquired.

  Further, as shown in FIG. 5, a plurality of constant voltage diodes 622B may be connected in series. In this way, each constant voltage diode 622B can have a low breakdown voltage, and noise output from these constant voltage diodes 622B can be reduced.

  Further, as shown in FIG. 6, a configuration using a constant voltage output circuit 640 may be used instead of the constant voltage diode 622B.

  Moreover, in the said embodiment, although the main fan apparatus 1 and the vacuum pump apparatus 100 showed the structure provided with one protection circuit, the structure provided with the some protection circuit 60 may be sufficient.

  Moreover, in the said embodiment, although the motor 10,30,110,230 was illustrated as a functional element, you may apply functional elements, such as another electric equipment, an electric circuit, an electronic circuit, for example.

It is a circuit diagram showing the whole fan device composition concerning a 1st embodiment. It is the circuit diagram which showed the structure of the protection circuit. It is the circuit diagram which showed the whole structure of the vacuum pump apparatus which concerns on 2nd Embodiment. It is the circuit diagram which showed the structure at the time of using a field effect transistor in a protection circuit. In a protection circuit, it is a circuit diagram at the time of comprising a plurality of constant voltage diodes connected in series. FIG. 4 is a circuit diagram showing a configuration when a constant voltage output circuit is used in the protection circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main fan apparatus 2 ... Auxiliary fan apparatus 10 ... Main fan motor 20 ... Main fan drive circuit 30 ... Auxiliary fan motor 40 ... Auxiliary fan drive circuit 50 ... In-vehicle power supply 60 ... Protection circuit 610 ... Backflow prevention diode 620 ... Constant voltage circuit 621 ... Transistor 622 ... Voltage holding circuit 622A ... Resistance element 622B ... Constant voltage diode

Claims (7)

In a vehicle-mounted electric device comprising a plurality of functional elements and a plurality of driving means provided corresponding to each of the plurality of functional elements and receiving the power supply from the vehicle-mounted power supply to drive the functional elements,
The plurality of driving means comprises a main driving means and a sub driving means,
The main drive means is
An in-vehicle electric apparatus comprising: a driving circuit that drives the corresponding functional element; and a sub-driving unit and a protection circuit that protects the functional element that is driven by the sub-driving unit. The protection circuit is
A reverse current blocking diode forward-connected to the in-vehicle power source;
The in-vehicle electric circuit according to claim 1, further comprising: a constant voltage circuit connected to the in-vehicle power source via the backflow prevention diode and supplying power to the driving unit at a predetermined voltage. apparatus. The constant voltage circuit is:
A transistor connected in an emitter-follower type to the in-vehicle power source;
The in-vehicle electric device according to claim 2, comprising a voltage holding circuit that holds a base voltage of the transistor at a predetermined voltage. The constant voltage circuit is:
A field effect transistor connected in a source follower type to the in-vehicle power source;
The in-vehicle electric device according to claim 2, comprising a voltage holding circuit that holds a gate voltage of the field effect transistor at a predetermined voltage.   The in-vehicle electric device according to claim 3, wherein the voltage holding circuit includes a series circuit of a resistance element and a constant voltage diode, and a common connection point thereof is connected to a base terminal of the transistor. .   5. The vehicle-mounted device according to claim 4, wherein the voltage holding circuit includes a series circuit of a resistance element and a constant voltage diode, and a common connection point thereof is connected to a gate terminal of the field effect transistor. Electrical equipment.   The in-vehicle electric device according to claim 5 or 6, wherein a plurality of the constant voltage diodes are connected in series.

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