JPH066982A - Communication device control power supply switching circuit for communication with inverter - Google Patents

Abstract

(57) [Abstract] [Purpose] Automatically switch the control power supply of the communication device that exchanges signals with the inverter device from the battery to the control power supply of the inverter device, extend the life of the battery and stabilize the operation of the control power supply circuit. Try to change. A control power supply switching circuit 3 including an output busbar opening / closing transistor TR ₃₁ of a battery 2 is provided between the battery and its positive output busbar terminal, and the power supply circuit is used as an operation state confirmation signal of a power supply circuit 6 of an inverter device. negative voltage -V _N is applied to the emitter of the transistor TR _33, the transistors TR ₃₁ and T together to conduct the transistor TR ₃₃ to the output of
By cutting off R ₃₂ , the control circuit 4 of the communication device 1
Can be operated by the output voltage of the inverter power supply circuit 6 without using the battery 2. On the other hand, even when the power supply circuit 6 is not operating, signals can be exchanged between the communication device 1 and the inverter device 5 by the battery 2 via both control circuits 4 and 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the communication in which the control power source of a communication device for exchanging signals with the inverter device without a battery as its control power source is switched from the control power source of the inverter device in operation. The present invention relates to a control power supply switching circuit for a device.

[0002]

2. Description of the Related Art When a communication device using a battery as its control power source and an inverter device having its own control power source cooperate with each other to exchange signals, the connection between the control power sources of both devices is as shown in FIG. The one shown in the circuit diagram is known. In FIG. 2, 1a is a communication device, 2 is a battery that serves as a control power source for the communication device, D ₃₂ is a blocking diode,
T _CP and T _CG are output terminals of both positive and negative output buses of the battery 2, respectively. Further, 5 is an inverter device, 6 is DC / DC
An inverter power supply circuit such as a converter, which has the same potential as both output terminals T _CP and T _{CG of the} battery.
_{It has an IP} , T _IG, and a negative potential output terminal T _IN, and D ₅₁ is a blocking diode. Further, 4 and 7 are a communication control circuit and an inverter control circuit, respectively, which send and receive a signal S _C via respective terminals T _CS and T _IS .

That is, the communication control circuit 4 is supplied with power only from the battery 2, and signals can be exchanged between the communication device and the inverter device only when the battery is brought into a connected state. In the figure, G indicates the reference potentials of the device control power supply circuits, and the terminals T _CP and T _IP and T _CN and T _IN output the voltages + V _P and −V _N based on the potential G, respectively. It is a terminal.

[0004]

However, in the conventional circuit configuration in which the communication device and the inverter device are connected as shown in FIG. 2, the communication device 1a is not operated unless the battery 2 is connected. It is not possible to exchange signals between the inverter device 5 and the inverter device 5. Even when the battery 2 and the inverter power supply circuit 6 are both in the operating state, the positive voltage + V _P
If the value of the battery is a little larger than that of the inverter power supply circuit, the power supply circuit is in a no-load state, and if the power supply circuit is a DC / DC converter, the element is damaged due to its oscillation failure. There will be a danger of. Further, if only the battery 2 is used as the control power source common to both the devices, the consumption of the battery is accelerated and the life of the battery is shortened. In view of this, it is an object of the present invention to provide a communication device control power supply switching circuit that prevents the above-mentioned problems and stabilizes signal transfer between the communication device and the inverter device.

[0005]

In order to achieve the above-mentioned object, a communication device control power supply switching circuit at the time of communication with an inverter according to the present invention uses a battery as its control power supply and a communication device for exchanging signals with the inverter device. A control power source switching circuit of the battery, wherein the positive and negative output bus bars of the battery are connected in parallel to the positive and negative output bus bars of the control power source of the inverter device having the corresponding polarities and voltages. Or, it is provided between the battery on the negative output bus bar and the control power source power supply point of the communication device, and if the control power source of the inverter device is in the operating state, the power source operating state is detected and the inserted A circuit is configured to switch the control power supply of the communication device from the battery to the inverter device control power supply by opening the output bus of the battery, and in the circuit configuration, A transistor is used as an element for opening or closing the positive or negative output bus of the battery, and the circuit is configured so that either positive or negative output voltage of the inverter device control power source becomes a base input signal of the transistor to conduct or cut off the same. Alternatively, the transistor is replaced by a normally-closed contact of a relay that operates by using either positive or negative output voltage of the inverter device control power supply as its excitation voltage.

[0006]

According to the present invention, when an inverter device having a DC / DC converter or the like as its control power source and a communication device having a battery as its control power source cooperate with each other to exchange signals, the control of both devices is performed. The inverter control power supply is provided between the control power supply power point of the communication device and the positive or negative output terminal of the battery so that the control power supply of the inverter becomes a common control power supply for both devices if both power supplies are in an operating state. Is a circuit configuration by providing an opening / closing means for opening the circuit when it is in an operating state, and as the opening / closing means, a transistor using the positive or negative output voltage of the inverter control power supply as its base input, or the output voltage A normally closed contact of a relay that operates as its exciting voltage is used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the circuit diagram of FIG. In FIG. 1, constituent elements having the same functions as those in the case of FIG. 2 showing the embodiment of the prior art are designated by the same reference numerals. In FIG. 1, a control power source switching circuit 3 is provided between the positive electrode side control voltage collecting point of the communication control circuit 4 on the positive electrode output bus of the battery 2 and the battery positive electrode terminal in FIG. Shows a circuit configuration in which the blocking diode D ₃₂ replaced is removed.

Further, the control power source switching circuit 3 includes a main transistor TR ₃₁ and auxiliary transistors TR ₃₂ and TR ₃₃ for opening and closing the battery positive electrode output bus, a diode D ₃₁ , resistors R ₃₁ and R.
₃₂ , R ₃₃ , R _34, and the circuit shown is an example in which a negative output voltage −V _N in the inverter power supply circuit 6 is supplied to the emitter of the transistor TR ₃₃ .

[0009] That is, in the battery 2 and the inverter power supply circuit 6 are both operating state of the said when the negative voltage -V _N is applied to the emitter of the transistor TR _33, the transistor with the transistor TR ₃₃ is turned The base potential of TR ₃₂ becomes negative and the transistor TR ₃₂ is cut off,
Therefore, the main transistor TR _{31 is} also cut off, and the communication control circuit 4 outputs the output voltage of the inverter power supply circuit 6 +
The control power is supplied only by V _P , and the power supply from the battery 2 is cut off.

[0010] Meanwhile, the case inverter power supply circuit 6 is not operating the negative voltage -V _N is blocked so that transistor TR ₃₃ is not supplied, both become conductive and the transistor TR ₃₁ and TR _32, the communication of the Both the control circuit 4 and the inverter control circuit 7 are powered by the battery 2. However, it is practically not possible to operate the above-mentioned inverter device in the non-operating state of the control power supply circuit, and therefore, as described above, only the battery 2 supplies power to both the communication control circuit 4 and the inverter control circuit 7 at the same time. There is no.

The circuit shown in FIG. 1 shows the first embodiment of the present invention, and the above-mentioned voltage + V _P or -V _{N is used.}
The second embodiment of the present invention can be obtained by replacing the main transistor TR ₃₁ of the power supply switching circuit 3 with the normally-closed contact of the relay operating as the exciting voltage.

[0012]

According to the present invention, a control power source switching circuit of a communication device for exchanging signals with an inverter device without a battery as its control power source is provided with a polarity and voltage corresponding to both positive and negative output busbars of the battery. In a state of being connected in parallel to both positive and negative output busbars of the control power supply of the inverter device having, and provided between the battery on the positive or negative output busbar of the battery and the control power supply power point of the communication device. If the control power supply of the inverter device is in an operating state, the control power supply of the communication device is switched from the battery to the inverter device control power supply by detecting the operating condition of the power supply and opening the output bus of the inserted battery. And a circuit is used to switch to a positive or negative output busbar opening / closing element of the battery, and A circuit is constructed so that either negative output voltage is used as a base input signal of the transistor to conduct or cut off the same, or a normally closed circuit of a relay which operates by using either positive or negative output voltage of the inverter device control power supply as its exciting voltage. By replacing the transistor with a contact, it is possible to exchange a signal between the communication device and the inverter device only by the control power supply of the inverter device without using the battery, thereby significantly extending the life of the battery. In addition, it is possible to prevent damage to the control power source constituent element that may occur when the battery and the inverter device control power source are used in parallel.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a conventional technique.

[Explanation of symbols]

1 communication device 1a communication device 2 battery 3 control power supply switching circuit 4 communication control circuit 5 inverter device 6 inverter power supply circuit 7 inverter control circuit D diode (D ₃₁ , D ₃₂ , D ₅₁ ) R resistance (R ₃₁ , R ₃₂ , R) ₃₃ , R ₃₄ ) TR transistor (TR ₃₁ , TR ₃₂ , TR ₃₃ )

Claims (3)

[Claims] 1. A control power supply switching circuit of a communication device for exchanging signals with a control power supply for a battery and an inverter device, wherein both positive and negative output busbars of the battery have corresponding polarities and voltages. In the state of being connected in parallel to both positive and negative output buses of the control power source of the inverter device, the inverter is provided between the battery on the positive or negative output bus line of the battery and the control power source power point of the communication device. If the control power supply of the device is in the operating state, the control power supply of the communication device is changed from the battery to the control power supply of the inverter device by detecting the operating condition of the power supply and opening the output bus of the inserted battery. A communication device control power supply switching circuit at the time of communication with an inverter, characterized in that the circuit is configured to switch. 2. The communication device control power source switching circuit for inverter-to-inverter communication according to claim 1, wherein a transistor is used as a positive or negative output busbar switching element of the battery, and either positive or negative of the inverter device control power source is used. Is a base input signal of the transistor to conduct and cut off the circuit, the communication device control power supply switching circuit during inverter-to-inverter communication. 3. The communication device control power supply switching circuit at the time of communication with an inverter according to claim 2, wherein the transistor is provided by a normally-closed contact of a relay that operates by using either positive or negative output voltage of the inverter device control power supply as its excitation voltage. A power supply switching circuit for controlling a communication device at the time of communication with an inverter, characterized in that