JPH0563708A - Power supply for home bus system - Google Patents

Abstract

(57) [Summary] [Purpose] The power supply is started by detecting the voltage of the data line, and the power supply is controlled without using a microcomputer. [Structure] The voltage detection unit 8 detects the voltage of the data line, the data reception circuit 9 receives the control signal from the data line, the counter unit 10 receives the control signal from the data reception circuit 9, and the oscillation pulse from the oscillation circuit 11. The relay drive circuit 12 from the voltage detection circuit 8 and the counter unit 10
From the power supply circuit 3 to supply power to the data line via the relay 2 and the power supply circuit 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home bus system dedicated power supply device for supplying power to a home bus system used at home.

[0002]

2. Description of the Related Art The power supply to the data line can be supplied by the power supply of the home bus main device. However, if many terminals are connected to the home bus main device, the power supply of the home bus main device is not enough. A separate power supply device is provided to supply power to the data line.

A power supply device for this type of home bus system will be described below with reference to the drawings. FIG. 2 shows a block diagram of a conventional power supply device dedicated to a home bus system. In FIG. 2, the data receiving circuit 4 inputs the control signal of the data line and outputs it to the CPU 5. C
When the control signal is input, the PU 5 operates the relay drive circuit 7 to make the relay 2 so that the power supply circuit 3 and the power supply circuit 1 provided on both sides of the relay 2 are connected to each other. Supply power to the data line. While the data communication is being performed, the data receiving circuit 4 receives the control signal, and therefore the data “present” is transmitted to the CPU 5, so that the relay 2 remains in the make state. If the home bus main device stops for some reason or the main bus main device is disconnected from the home bus main device, no control signal is sent, so that the data "nothing" is transmitted to the CPU 5, and the timer pulse of the oscillation circuit 6 causes Then, the timer goes out, the operation of the relay drive circuit 7 is stopped, and the relay 2 is broken to stop the power supply to the data line.

[0004]

However, in the above-mentioned conventional power supply device for the home bus system, since the power supply to the data line is performed by the data communication of the control signal, the power is not supplied unless the control signal is received. However, there is a problem in that it takes time to supply power when the system starts up, a temporary power supply overload state occurs when the system starts up, the system goes down, and because the microcomputer controls the power supply, it costs money. It was

The present invention solves such a conventional problem, and is for exclusive use in a home bus capable of detecting the voltage of a data line to start power supply and controlling the power supply without using a microcomputer. It is an object to provide a power supply device.

[0006]

In order to achieve the above object, the present invention provides a voltage detecting section for detecting the voltage of a data line, a data receiving section for receiving a control signal of the data line, and a control from the data receiving section. A counter for inputting a signal is provided, and when the voltage detection unit detects the voltage of the data line,
The power is supplied to the data line.

[0007]

When the voltage detector detects the voltage, the power is supplied to the data line, so that the power can be supplied immediately and the system down can be prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of a power supply unit for exclusive use in a home bus system according to an embodiment of the present invention. In FIG. 1, 1 is a power supply circuit that supplies power to a data line, 2 is a relay connected to the power supply circuit 1,
3 is a power supply circuit that supplies power to the power supply circuit 1 via the relay 2, 8 is a voltage detection circuit that detects whether or not a voltage is applied to the data line, and 9 is data reception that receives a control signal from the data line A circuit 10, a counter unit connected to the data receiving circuit 9, 11 an oscillation circuit that outputs a timer pulse to the counter unit 10, and 12 is connected to the voltage detection circuit 8 and the counter unit 10 to drive the relay 2. It is a relay drive circuit.

Next, the operation of the above embodiment will be described.
In the above-described embodiment, the voltage detection circuit 8 detects the voltage of the data line, operates the relay drive circuit 12, and makes the relay 2 so that the power supply circuit 3 is connected to the power supply circuit 1 and supplies power to the data line. To do. While the data communication is being performed, the data receiving circuit 9 receives the control signal and the pulse is input to the counter unit 9. Therefore, the counter unit 9 counts with the timer pulse from the oscillation circuit 11. Clears this. Therefore, the relay 2 continues to be supplied with power while being in the make state. If the home bus main unit stops operating, or if this unit is disconnected from the home bus main unit, the control signal will not come.
The count of the counter unit 9 is not cleared, and the counter unit 9
Counts for a certain period of time with the timer pulse of the oscillation circuit 11, and then the timer goes out, and the relay drive circuit 1
By stopping the operation of No. 2 and breaking the relay 2, the power supply to the data line is stopped.

As described above, according to the above embodiment, the voltage of the data line is detected by the voltage detection circuit 8 and the power can be supplied immediately, so that there is an advantage that the system does not go down. Since the counter unit 10 can control to stop the power supply when the device is stopped, the cost can be reduced by replacing the conventional microcomputer with the gate IC.

[0011]

As is apparent from the above-described embodiment, the present invention inputs a control signal from the voltage detection unit for detecting the voltage of the data line, the data reception unit for receiving the control signal of the data line, and the data reception unit. A counter is provided to supply the power to the data line at the same time when the voltage detection unit detects the voltage of the data line, which has the advantage that immediate power supply is possible and the system does not go down. Can be performed by a counter, and the cost can be reduced by replacing the conventional microcomputer with a gate IC.

[Brief description of drawings]

FIG. 1 is a block diagram of a power supply device dedicated to a home bus system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional power supply device dedicated to a home bus system.

[Explanation of symbols]

 1 Feeding Circuit 2 Relay 3 Power Supply Circuit 8 Voltage Detection Circuit 9 Data Reception Circuit 10 Counter Section 11 Oscillation Circuit 12 Relay Drive Circuit

Claims (1)

[Claims] 1. A voltage detecting section for detecting a voltage of a data line connected to a home bus main unit, a data receiving section for receiving a control signal of the data line, and a signal from the data receiving section as an input. A power supply device dedicated to a home bus system, comprising: a power supply circuit connected to the home bus system; and a relay drive unit that controls a relay provided between the power supply circuit.