JPH08216657A - Power supply circuit of air conditioner for automobile - Google Patents

Abstract

PURPOSE: To provide a power supply circuit of an air-conditioner capable being doubly used for an on-vehicle electric power supply and an outside electric power source, extensively for a general home and an automobile camping area, inexpensive, small and favourable in efficiency. CONSTITUTION: This is a power circuit of a car air conditioner provided with a second switch 5 to change an input electric source wire to a rectifier diode 6 over to a car mounted generator 1 and to a commercial electric power source 30 and a first switch 9 to switch over an input electric power source wire to rectifier condensers 10, 11 and made to be actuated by either of the commercial electric power source 30 and the car mounted generator 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable not only to a vehicle-mounted power source but also to
The present invention relates to a power supply circuit of an air conditioner for an automobile equipped with an electric compressor, which can be air-conditioned even from an external commercial power supply.

[0002]

2. Description of the Related Art A conventional automotive air conditioner of this type includes
There is one such as that shown in Japanese Utility Model Publication No. 36-27032.
FIG. 3 shows the configuration of the air conditioner of this Japanese Utility Model Publication No. 36-27032.

In FIG. 3, reference numeral 2 is an engine, and 23 is a generator driven by the engine. Reference numeral 25 is an air conditioner that is operated by an AC power source from the generator 23 while the vehicle is running, but can be operated by an external power source when the vehicle is stopped.

Reference numeral 26 designates the power source of the air conditioner 25 as the generator 23.
And 27 is a switching means for switching to an external power source, and 27 is an outlet for connecting the external power source.

This air conditioner is intended to prevent leakage of refrigerant by using a hermetic compressor and to save fuel and extend the life of the engine by operating with an external power source.

It is also possible to precool the passenger compartment.

[0007]

However, the above-mentioned conventional air conditioner has the following problems.

First, in FIG. 3, unless the power supply capacity, the number of phases and the voltage of the generator and the external power supply match the voltage specifications of the air conditioner, the air conditioner may not operate normally. Yes (no mention is made of how to deal with the case where the generator and the external power supply have different power supply capacities and different numbers of phases and voltages).

For example, when the number of phases is different, the motor specifications of the electric compressor are naturally different. Also, if the voltage is different, the circuit will be destroyed by overvoltage, or the circuit will not operate by undervoltage. Also, if the capacity is different but no measures are taken against it,
The load may exceed the power supply capacity and burn out.

The external power source, which is widely used in general households and auto campgrounds, is a single-phase 100 (V) power source. In this case, in the air conditioner of FIG. Since it has to be a phase generator, this single-phase generator has a problem that it is very large compared to a three-phase generator to obtain the same output.

If the generator 23 is a three-phase generator for downsizing, the external power source must also be a three-phase power source.
There was a problem that parking air conditioning could not be used widely in ordinary households or in auto campsites.

Although not installed in the automobile shown in FIG. 3, an air conditioning unit incorporated in the instrument panel is installed as a standard in recent automobiles. In addition to the standard air conditioning unit, a new air conditioning unit is installed. There is also a problem in that the cost must be increased and the air conditioner must be a large one because it must be provided.

The present invention is intended to solve the above-mentioned problems, and even if the on-vehicle generator and the external power supply have different capacities, phase numbers, and voltages, they can be widely and generally used for both power supplies, and are inexpensive and compact. The purpose is to provide an efficient air conditioner power supply circuit.

[0014]

In order to solve the above-mentioned problems, a power supply circuit for an automobile air conditioner according to the present invention includes (1) an on-vehicle generator powered by an engine and a motor, which is used for air conditioning. Of the electric compressor for compressing the refrigerant and the three-phase AC voltage output from the vehicle-mounted generator as an input, a rectifying diode group that rectifies and outputs the same, and a DC voltage output from the rectifying diode group is smoothed. A smoothing capacitor connected to the positive output terminal and the negative output terminal of the rectifying diode group, a positive terminal connected to the positive output terminal of the rectifying diode group, and a negative terminal of any one of the rectifying diode group. A first rectifying capacitor connected to the three-phase AC input terminal, a positive terminal connected to the negative terminal of the first rectifying capacitor, and a negative terminal connected to the negative output terminal of the rectifying diode group. A second rectifying capacitor, a connection portion of the first and second rectifying capacitors, and a first switch that opens and closes between any one of the three-phase AC input terminals of the rectifying diode group; A DC voltage output from the rectifying diode group and the smoothing capacitor is converted into a variable voltage or an AC voltage with a variable frequency, and an inverter that drives the electric compressor at a variable rotation speed, and the in-vehicle generator to It is provided on the power supply line to the rectifier diode group, and switches the input AC power supply to the rectifier diode group to the on-vehicle generator and an external single-phase commercial power source, and at least the first power line to be switched A second switch which includes an input AC power supply to which the switch is connected, and when the on-vehicle generator is used as a power supply, the first switch is opened to open a three-phase full-wave Order It was carried out,
When the commercial power source is used as the power source, the first switch is closed to perform single-phase voltage doubler rectification.

(2) In addition to the means (1) for solving the above-mentioned problems, the AC power generation voltage of the vehicle-mounted generator is set to a voltage almost twice that of the commercial power supply.

(3) In addition to the means (1) and (2) for solving the above problems, a battery for supplying power to a fan motor for heat exchange for air conditioning is provided, and a commercial power source is used as a power source. In this case, an AC / DC converter for converting the commercial power source into the voltage level of the battery and charging the battery is provided.

(4) In addition to the means (1), (2) and (3) for solving the above-mentioned problems, a power consumption detecting means for detecting the power consumption of the electric compressor, and the electric compressor. When the drive power supply has a drive power supply detection means for detecting whether it is an in-vehicle generator or a commercial power supply, the allowable value of the power consumption is changed according to the drive power supply, and when the power consumption exceeds the allowable value. Is provided with output limiting means for limiting the output of the electric compressor.

[0018]

The present invention has the above-described structure. (1) When a three-phase on-vehicle generator is used as a power source, a rectifier diode group and an on-vehicle generator are connected by a second switch, and a voltage doubler is used. By opening the first switch that selects the operation of rectification, three-phase full-wave rectification is performed and DC power is supplied to the inverter.

When a single-phase commercial power source is used as a power source,
The second switch connects the rectifier diode group to the commercial power supply and closes the first switch that selects the operation of double voltage rectification, so that single-phase double voltage rectification is performed and DC power is supplied to the inverter. Is supplied.

Therefore, when the external power supply is used while the vehicle is stopped, the single-phase commercial power supply widely used in general households can be used, and when the vehicle-mounted generator is used, a small three-phase power generation is used. You will be able to use the machine.

Further, as is clear from the above description, the air conditioner can be operated without problems even when the number of phases of the power sources is different.

Furthermore, since the input DC voltage of the inverter can be doubled or more than the AC voltage of the commercial power source, the current flowing through the inverter and the electric compressor can be reduced, and the electric wire can be thin.

(2) In addition to the operation described in (1) above, if the power generation voltage of the on-vehicle generator is set to be about twice that of the single-phase commercial power source, the inverter voltage of any power source can be increased. The input voltage levels become almost equal, and the air conditioner can be operated without problems even when the voltage of the vehicle-mounted generator and the commercial power supply are different.

(3) In addition to the operations described in (1) and (2) above, when the commercial power source is used as the power source, the AC / DC converter is used to charge the battery. Air conditioning can be performed using an existing air conditioning unit including a fan motor or the like, which is standardly installed in a vehicle, and it is not necessary to add a new air conditioning unit.

(4) In addition to the operations described in (1), (2) and (3) above, the drive power source of the electric compressor is detected by the drive power source detecting means, and the power consumption is reduced accordingly. When the allowable value is changed and the power consumption exceeds the allowable value, the output of the electric compressor is limited, so that the power consumption of the air conditioner is always within the power capacity of each power supply. The air conditioner can be operated without problems even when the capacities of the respective power supplies are different.

[0026]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a power supply circuit diagram of an automobile air conditioner of the present invention when a commercial power supply is selected. First, the configuration of the present invention will be described with reference to FIG.

The vehicle-mounted generator 1 is driven by the belt 3 from the engine 2 when the vehicle is running. The vehicle-mounted generator 1 has an output of DC 12 (V) and a three-phase AC of about 200 (V). It is a dual output generator. Then, with this DC output of 12 (V), the battery 4 is charged,
The output of the three-phase 200 (V) is output via the second switch 5.
It is input to the AC input terminal of the rectifying diode group 6.
Here, the second switch 5 has only two lines opened and closed, but there is no particular problem even if all three lines are opened and closed.

Further, 7 is an external commercial power source (single-phase AC10
When a commercial power source is used as the power source for the plug connected to 0 (V), power is supplied from the plug 7 to the AC input terminal of the rectifier diode group 6 via the second switch 5.
Reference numeral 8 denotes an AC / DC converter that converts a commercial power source of AC100 (V) into a DC voltage of about DC12 (V) to charge the battery 4.

Reference numeral 9 is a first switch that opens and closes any one of the AC input terminals of the rectifying diode group 6 and the connecting portion between the first rectifying capacitor 10 and the second rectifying capacitor 11. Reference numeral 12 is a smoothing capacitor for smoothing the DC voltage including the AC ripple output from the rectifying diode group 6 and the first and second rectifying capacitors 10 and 11, and supplying the inverter 13 with power.

The inverter 13 converts this DC voltage into a PWM pseudo AC voltage of three-phase variable voltage and variable frequency by the internal switching element group 14, and changes the electric compressor 15 for compressing the refrigerant for air conditioning. It is driven at the number of rotations.

Reference numeral 16 is a fan motor for indoor heat exchange, which is standardly mounted on an automobile, and 17 is a fan motor for outdoor heat exchange.

Reference numeral 18 denotes a power source mode selecting means for the occupant to select whether the power source of the electric compressor 15 is the on-vehicle generator 1 or the commercial power source 30. If the machine 1 is used and the engine is stopped when the vehicle is stopped, the commercial power source 30 is selected.

Then, the information on the power supply mode selected by the power supply mode selection means 18 is sent to the control device 19, and in the control device 19, the first switch 9 and the second switch 5 are connected.
Control. The control device 19 is also supplied with signals from a current sensor 20 detecting a DC current and a voltage sensor 21 detecting a DC voltage. This current, the current detected by the voltage sensor, The voltage may be an alternating current input portion.

Further, the control device 19 uses the serial communication or the like depending on the environmental conditions inside and outside the vehicle to drive the inverter 13
The rotation speed command value of the electric compressor 15 is also sent to.

Reference numeral 22 is a reactor for suppressing the inrush current and improving the power factor. Next, the operation of the present invention will be described with reference to FIGS. 1, 2, and 4.

FIG. 1 is an electric circuit diagram when the occupant selects the commercial power source 30, and the occupant first selects the power source mode selecting means 18
When the commercial power mode is selected by and the plug 7 is inserted into the commercial power outlet, the control device 19 controls the first switch 9 and the second switch 5 to be in the positions shown in FIG. In this case, when controlling the first and second switches, it is controlled after confirming that the engine 2 is stopped.

Then, the commercial power source and the rectifying diode group 6
Since the single-phase voltage doubler rectifying circuit is configured by the first and second rectifying capacitors, the input DC voltage to the inverter 7 is about 280 (V) when there is no load, and the electric compressor 15 is It can be driven.

Further, since the AC / DC converter 8 operates, the battery 4 can be charged even if the engine 2 is stopped and the in-vehicle generator 1 is not generating power, and the heat exchanging fan motors 16 and 17 are operated. Battery 4 even when working
It does not increase, and long-term driving is possible.

Further, the outlet capacity of a commercial power source is generally 15 (A), that is, about 1.5 in apparent power.
Since there is (KVA), it is necessary to control so that the total power consumption of the electric compressor 15 and the AC / DC converter 8 does not exceed 1.5 (KW).

However, since 1.5 (KW) means that the power source power factor is 1, it is actually necessary to limit the power consumption to a value smaller than 1.5 (KW). Specifically, if the electric power consumption of the electric compressor is limited to about 1.2 (KW), the outlet capacity will not exceed the capacity even if the supply current to the AC / DC converter 8 is applied.

FIG. 4 shows the control flow of the control of this part. When the power source is the commercial power source 30, the permissible value of the power consumption of the electric compressor 15 is set to 1.2 (KW) (step 101, 102), otherwise, that is, when the vehicle-mounted generator 1 is used as a power source, the allowable value of the power consumption of the electric compressor is set to 2.5 (KW) (steps 101, 1).
03).

Next, the current and voltage are input and the power consumption is calculated (steps 104 and 105). If the detected power consumption exceeds the allowable value, the rotation speed of the electric compressor is reduced to limit the air conditioner output (step 1
06, 107), otherwise there is no restriction (steps 106, 108).

By controlling in this way, even if the power supply capacity is different, the air conditioner can be operated without problem within the power supply capacity.

FIG. 2 is an electric circuit diagram when the occupant selects the vehicle-mounted generator 1 as a power source. When the occupant first selects the vehicle-mounted generator mode by the power supply mode selection means 18, the control device 19 causes the first mode. The switch 9 and the second switch 5 are shown in FIG.
Control so that the position becomes. In this case, when controlling the first and second switches, control is performed after confirming that the engine 2 is operating.

Then, the three-phase 200 (V) of the vehicle-mounted generator 1
Since the output and the rectifying diode group 6 constitute a three-phase full-wave rectifying circuit, the input DC voltage to the inverter 7 is
In the case of no load, it becomes about 280 (V), and the electric compressor 15 can be driven. Here, the first and second rectifying capacitors 10 and 11 used for voltage doubler rectification at the time of commercial power supply can be used as capacitors for smoothing to reduce the capacity of the smoothing capacitor 12,
There are also effects of downsizing and cost reduction.

When the engine 2 is operating,
The battery 4 can be charged from the DC 12 (V) output of the vehicle-mounted generator 1, and each heat exchange fan motor 1 can be charged.
Even if 6 and 17 are operating, the battery 4 does not run high, and it is possible to operate for a long time.

As described above, in the present invention, the three-phase 2
The air conditioner can be operated without problems even with power supplies having different numbers of phases, voltages, and capacities, such as an on-board generator of 00 (V) and an external power supply of single-phase 100 (V).

[0049]

As described above, the power supply circuit for an automobile air conditioner according to the present invention comprises: (1) an electric compressor for compressing a refrigerant for air conditioning, which incorporates an on-vehicle generator powered by an engine and a motor. Machine and a three-phase AC voltage output from the vehicle-mounted generator as an input, a rectifying diode group that rectifies and outputs the voltage, a DC voltage output from the rectifying diode group is smoothed, and A smoothing capacitor connected to the positive output terminal and the negative output terminal, a positive terminal connected to the positive output terminal of the rectifier diode group, and a negative terminal connected to any one three-phase AC input terminal of the rectifier diode group. And a second rectifying capacitor having a positive terminal connected to a negative terminal of the first rectifying capacitor and a negative terminal connected to a negative output terminal of the rectifying diode group, Before Note A first switch that opens and closes between the connection portion of the first and second rectifying capacitors and any one three-phase AC input terminal of the rectifying diode group, the rectifying diode group, and smoothing An inverter that converts a DC voltage output from a capacitor into a variable voltage or an AC voltage with a variable frequency and drives the electric compressor at a variable rotation speed; and a power supply line from the vehicle-mounted generator to the rectifier diode group. And switching the input AC power supply to the rectifier diode group to the vehicle-mounted generator and an external single-phase commercial power supply, and at least the first switch is connected to the power supply line for switching. It is provided with a second switch that includes an input AC power supply, and when the on-vehicle generator is used as a power source, the first switch is opened to perform three-phase full-wave rectification,
When the commercial power source is used as the power source, the first switch is closed to perform single-phase voltage doubler rectification, so that even if the number of phases of the vehicle-mounted generator and the external power source is different, It is possible to provide a power supply circuit for an automobile air conditioner that is widely and generally used as a power supply, and is inexpensive, compact, and efficient (the reason why this effect is obtained is described in the above action (1)). .

(2) In addition to the means (1) for solving the above-mentioned problems, the AC power generation voltage of the vehicle-mounted generator is set to a voltage almost twice that of the commercial power source. Even if the number of phases and the voltage of the external power supply are different,
It is possible to provide a power supply circuit for an automobile air conditioner that can be widely and generally used, is inexpensive, is compact, and is efficient (the reason why this effect is obtained is described in the above action (2)).

(3) In addition to the means (1) and (2) for solving the above-mentioned problems, a battery for supplying power to a fan motor for heat exchange for air conditioning is provided, and a commercial power source is used as a power source. In this case, since the AC / DC converter for converting the commercial power supply into the voltage level of the battery and charging the battery is provided, whether the number of phases of the vehicle-mounted generator and the external power supply is different or the number of phases is different. It is possible to provide a power supply circuit for an automobile air conditioner that can be widely and generally used with both power supplies, and is inexpensive, compact, and efficient even if the voltage is different (the reason why this effect can be obtained is , Described in the above action (3)).

(4) In addition to the means (1), (2) and (3) for solving the above-mentioned problems, a power consumption detecting means for detecting the power consumption of the electric compressor, and the electric compressor. When the drive power supply has a drive power supply detection means for detecting whether it is an in-vehicle generator or a commercial power supply, the allowable value of the power consumption is changed according to the drive power supply, and when the power consumption exceeds the allowable value. Since the output limiting means for limiting the output of the electric compressor is provided, whether the number of phases of the in-vehicle generator and the external power supply is different, or the number of phases and voltage are different, or the number of phases, voltage and capacity are different. Even if they are different, it is possible to provide a power supply circuit for an air conditioner that is widely and generally used for both power supplies and is inexpensive, compact, and efficient (the reason why this effect is obtained is due to the aforementioned action (4)). Described in.).

[Brief description of drawings]

FIG. 1 is a circuit diagram of a power supply circuit of an automobile air conditioner according to an embodiment of the present invention (when a commercial power supply is used).

FIG. 2 is a circuit diagram of a power supply circuit of an automobile air conditioner according to an embodiment of the present invention (when an external power supply is used).

FIG. 3 is a block diagram of a conventional air conditioner

FIG. 4 is a control flowchart of the control device.

[Explanation of symbols]

 1 On-vehicle generator 2 Engine 3 Belt 4 Battery 5 Second switch 6 Second rectifier diode group 7 Plug 8 AC / DC converter 9 First switch 10 First rectifier capacitor 11 Second rectifier capacitor 12 Smoothing capacitor 13 Inverter 14 Switching Element Group 15 Electric Compressor 16 Fan Motor for Indoor Heat Exchange 17 Fan Motor for Outdoor Heat Exchange 18 Power Mode Selector 19 Control Device 20 Current Sensor (Power Consumption Detector) 21 Voltage Sensor (Power Consumption Detector) 22 Reactor 23 Conventional Generator 24 Clutch 25 Conventional Air Conditioner 26 Switching Means 27 Outlet 28 Drive Power Supply Detecting Means 29 Output Limiting Means 30 Commercial Power Supply

Claims (4)

[Claims] 1. An on-vehicle generator that uses an engine as a power source, a power compressor that incorporates a motor and that compresses a refrigerant for air conditioning, and a three-phase AC voltage that is output from the on-vehicle generator as an input. A rectifying diode group that rectifies and outputs a three-phase AC voltage, a DC voltage output from the rectifying diode group is smoothed, and a smoothing capacitor connected to the positive output terminal and the negative output terminal of the rectifying diode group, A positive terminal connected to a positive output terminal of the rectifier diode group, a negative terminal connected to any one of the three-phase AC input terminals of the rectifier diode group, and a positive terminal to the first rectifier A second rectifying capacitor connected to the negative terminal of the rectifying capacitor, the negative terminal of which is connected to the negative output terminal of the rectifying diode group; A first switch for switching between any one of the three-phase AC input terminals of the rectifying diode group, a DC voltage output from the rectifying diode group and the smoothing capacitor, a variable voltage or a variable frequency An inverter that converts the AC voltage and drives the electric compressor at a variable speed, and an input AC power supply to the rectifier diode group, which is provided on a power line from the vehicle-mounted generator to the rectifier diode group, In addition to switching to an on-vehicle generator and an external single-phase commercial power supply, the power supply line to be switched is equipped with a second switch in which at least the input AC power supply to which the first switch is connected is included. When the on-vehicle generator is used as a power source, three-phase full-wave rectification is performed using the first switch, and when the commercial power source is used as a power source, the first switch is closed. ,Single-phase Power supply circuit for a motor-vehicle air-conditioning apparatus which performs a voltage rectifier. 2. The power supply circuit for an automobile air conditioner according to claim 1, wherein the AC power generation voltage of the vehicle-mounted generator is set to a voltage almost twice as high as the commercial power supply. 3. A battery for supplying power to a fan motor for heat exchange for air-conditioning, wherein when the commercial power source is used as the power source, the commercial power source is converted into a voltage level of the battery, The power supply circuit for an automobile air conditioner according to claim 1 or 2, further comprising an AC / DC converter for charging the vehicle. 4. A power consumption detection means for detecting the power consumption of the electric compressor, and a drive power supply detection means for detecting whether the drive power source of the electric compressor is an on-vehicle generator or a commercial power source. 3. An output limiting means for changing an allowable value of electric power according to a driving power source, and for limiting an output of the electric compressor when the power consumption exceeds the allowable value.
3. A power supply circuit for an automobile air conditioner according to any one of 3 above.