JPH0355921A - Communication equipment - Google Patents

Abstract

PURPOSE:To reduce the power consumption of the entire equipment by supplying electric power to a communication processing section which is large in power consumption via a relay, and limiting a load of a power supply system with diode OR to a common section with a small load. CONSTITUTION:A switching logic section 13 receives a decision output of window comparators 11, 12 to decide which of an active power supply 1 and a standby power supply 2 is to be selected. Then a switch driving section 14 is controlled and its output drives a relay of a switching section 3. Since the switching logic section 13 does not required the operation at a high frequency band because of its characteristic, the circuit as a logic circuit employing a CMOS is operated with a power voltage dropped by nearly 0.7V. Thus, it is not required to increase an output voltage of the active and standby power supplies 1, 2 by nearly 0.7V. Since the power supply to the communication processing section 5 which is large in current consumption is not through a diode but through a relay, the voltage drop of nearly 0.7V is evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device, and particularly to a communication device that requires low power consumption and backup operation of the power supply system. [Prior Art] Conventionally, this type of communication device has the following characteristics, as shown in an example in Fig. 3:
It has a working power supply 1 and a standby power supply 2, and their outputs are combined in a combiner 6 to drive the communication processing unit 5, so even if either power supply fails, communication processing will continue. Part 5
It was designed so that there was no problem with the operation of the device. [Problems to be Solved by the Invention] In the conventional communication device described above, the synthesis section 6 is realized by an OR circuit using a diode, so a drop of about 0.7V always occurs in the synthesis section 6. Therefore, the communication processing unit 5
When using ICs such as TTL, ECL, and gate arrays, it is necessary to increase the output of the active and standby power supplies 1 and 2 by about 0.7V in advance to avoid malfunction of these ICs, which reduces the overall performance of the device. The drawback is that power consumption increases. [Means for Solving the Problems] A communication device of the present invention includes a working power source, a standby power source, a switching section that switches the outputs of the working power source and the standby power source using a relay, and a switching control section that controls the switching section. , and a communication processing section that is driven depending on the output of the switching section.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The working power source 1, backup power source 2, and communication processing section 5 are the same as those in the conventional example shown in FIG. 2, but a switching section 3 using a relay and a switching control section 4 that controls and drives the switching section 3 are used. is newly added.

FIG. 2 is a block diagram of the switching control section 4. The secondary outputs of the current power source 1 and the backup power source 2 are inputted from the current power source input terminal and the backup power source input terminal. 2 of these inputs
The OR output from the two diodes X is used as an internal power source of the switching control section 4.

On the other hand, each input before being ORed is voltage-divided by two resistors R, since the current power supply 1 and standby power supply 2 are used as respective output voltage monitors. The voltage-divided outputs are input to window comparators 11 and l2, respectively, and a reference voltage generator l5 using a Zener diode
It is compared with the output voltage of the output voltage and determines whether it is within the standard voltage range or not. The switching logic section 13 receives the judgment outputs of the window comparators 11 and 12, and depending on the state of these judgment outputs, determines which of the working power source 1 and the standby power source 2 to select, and controls the switch drive section 14. , the relay of the switching section 3 is driven by the output of the switching device driving section 14.

Furthermore, since the switching logic section 13 does not need to operate in a high frequency band due to its characteristics, by using a logic circuit using CMOS, it can be operated even when the power supply voltage drops by about 0.7V. Set the output voltage of the current and backup power supplies 1 and 2 to 0. There is no need to raise it to about 7.

With the configuration described above, power is supplied to the communication processing unit 5, which consumes a large amount of current, through a relay instead of a diode, so that 0.
This eliminates the voltage drop of about 7 V, making it possible to lower the output voltage of the active and standby power supplies 1 and 2 by about 0.7 V, and reducing the power consumption of the communication device as a whole. Note that the switching unit 3 and the switching control unit 4 must be operated in a diode-ORed power supply system, but the current consumption required here is one to two orders of magnitude compared to the power consumption required by the communication processing unit 5. Since it is small, the effect on the overall power consumption can be almost ignored. [Effects of the Invention] As explained above, the present invention supplies power to a communication processing unit that consumes a large amount of power via a relay, and
By limiting the load of the power supply system that takes R to a common part with a small load, it is possible to reduce the power (approximately 0.7 V x load current) that was conventionally consumed by diodes to almost zero, and the equipment This is effective in reducing overall power consumption.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a block diagram of the switching control unit 4, and FIG. 3 is a block diagram of an example of a conventional communication device. DESCRIPTION OF SYMBOLS 1... Working power supply, 2... Standby power supply, 3... Switching part, 4... Switching control part, 5... Communication processing part, 11...
- Window comparator, 12... Window comparator, l3... Switching logic section, 14... Switching device driving section, 15... Reference voltage generating section. A [bad luck]

Claims (1)

[Claims] A working power source, a standby power source, a switching unit that switches the output of these working power source and standby power source by a relay, a switching control unit that controls this switching unit, and depending on the output of the switching unit,
1. A communication device comprising: a driven communication processing section.