JPS631492Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device for a facsimile transceiver.

Conventionally, a power supply device for a facsimile transceiver has been divided into a main power supply section and a sub power supply section. This main power supply section operates the main functions of the facsimile transceiver, such as communication control functions and reading and recording driving functions. On the other hand, the sub power supply section has a main power supply function for operating the facsimile transceiver, a telephone line network control function, and an indicator lamp control function, and is constantly supplied with power.

As described above, in the conventional facsimile transceiver power supply device, since the sub power supply section has many functions, the power consumption during standby is several tens of VA, which is a disadvantage of wasting power. In addition, due to the large power consumption, the shape of the power supply itself becomes large.
It also had the disadvantage of being expensive.

In order to solve these shortcomings, this invention minimizes the functions of the sub-power supply section, lowers the power consumption of the facsimile transceiver during standby, and also reduces the size and cost of the power supply, thereby achieving economic efficiency and energy saving. The aim is to

The present invention will be explained below based on the drawings. FIG. 1 is a schematic diagram of a facsimile transceiver showing an embodiment of the present invention. Reference numeral 1 denotes a power supply device, which is divided into a main power supply section 3 and a sub-power supply section 2.
Reference numeral 4 denotes a switch that starts or stops supplying power to the main power supply section 3. 5 is the main part of a facsimile transceiver driven by the power supplied by the main power supply section 1, and is equipped with a communication control function and reading and recording driving functions. Reference numeral 6 denotes a main power supply control circuit that operates with the power supplied by the sub power supply 2. This main power supply control circuit 6 includes a frequency detection circuit 8 that detects a called signal input via a telephone line.
and a document presence detection sensor 7 installed in the document insertion slot.
, AND gate circuit 9, and set/reset/
The flip-flop circuit (hereinafter abbreviated as SRFF circuit) 10 is constructed. The output signal B of the frequency detection circuit 8 and the output signal A of the document presence/absence detection sensor 7 are both input to an AND gate circuit 9. The output signal C of the AND gate circuit 9 is
It is input to the S input terminal of the SRFF circuit 10. Further, a signal D indicating that communication is in progress, which is output from a communication control circuit (not shown) in the main part 5 of the facsimile transceiver, is also input to the R input terminal of the SRFF circuit 10. The signal H output from the output terminal of the SRFF circuit 10 is input to the switch 4, and when the signal H is at a high level, the switch 4 is in an open state, and conversely, when the signal H is at a low level, the switch 4 is in an open state. becomes closed.

The operation of the facsimile transceiver having the above configuration will be explained below. First, during standby, the switch 4 is in an open state. At this time, the output signals A and B of the document presence detection sensor 7 and the frequency detection circuit 8 are both at a high level. Therefore, the output signal C of the AND gate circuit 9 also becomes high level.

Next, the operation during transmission will be explained using FIG. 2. FIG. 2 is a timing chart showing the input/output signals of each element of the main power supply section control circuit 6 during transmission in this embodiment. During transmission, the operator always places the original to be sent on the original table and inserts it into the original insertion slot. At this time, the document presence detection sensor 7 in the document insertion slot detects the presence of the document,
The output signal A of the document presence/absence detection sensor 7 changes from high level to low level. At the same time, the output signal C of the AND gate circuit 9 similarly becomes low level. The SRFF circuit 10 enters the set state at the falling point a of the signal C input to the S input terminal, and the signal H output from the output terminal becomes low level. Therefore, the switch 4 is in the closed state. In this way, power is supplied to the main power supply section 3 simply by setting the document. Note that there is a time lag between when power is supplied to the main power supply unit 3 and when communication starts (signal D goes high).The reason for this is that after setting the original, dialing and pressing the send button. This is because communication is started only after this. Then, when the transmission is completed, the signal D indicating that communication is in progress changes from high level to low level. When the falling point b of this signal 2 is input to the R input terminal, the SRFF circuit 10 enters a reset state, and the signal H output from the output terminal changes from low level to high level. As a result, the switch 4 becomes open, and the supply of power to the main power supply unit 3 is stopped. In this way, when the transmission is completed, the power supply to the main power supply section 3 is automatically stopped and the main power supply section 3 returns to the standby state. Note that there is a time lag between the time when the document presence detection sensor 7 detects the "absent" state of the document and the end of communication because the mounting position of the document presence detection sensor 7 and the document reading position are usually far apart. This is because there is.

The operation during automatic reception will be explained using FIG. FIG. 3 is a timing chart showing the input/output signals of each element of the main power section control circuit 6 during automatic reception in this embodiment. Automatic reception is to detect a called signal coming from the other party, start supplying power to the main power supply section 3, and automatically perform communication. First, when the frequency detection circuit 8 detects a called signal coming from the other party, the output signal LO changes from high level to low level. At the same time, the output signal C of the AND gate circuit 9 also changes from high level to low level. When the falling point c of this signal C arrives at the S input terminal, the SRFF circuit 10 enters the set state, and the signal H output from the output terminal becomes low level. Therefore, the switch 4 is closed, and power supply to the main power supply section 3 is started. This main power supply section 3
When power is supplied to the facsimile transceiver, the telephone line network control function in the main part 5 of the facsimile transceiver operates to close the direct current loop of the line and start communication. At this time, the called signal disappears, so
The output signal B of the frequency detection circuit returns from low level to high level. Then, when the communication ends, the signal D indicating that communication is in progress changes from high level to low level. This falling point d is the SRFF circuit 10
When the signal reaches the R input terminal of the SRFF circuit 10, the SRFF circuit 10 enters a reset state, and the output signal H from the output terminal changes from low level to high level. Therefore, the switch 4 is in an open state, and the supply of power to the main power supply section 3 is stopped. In this way, when the reception is completed, the power supply to the main power supply unit 3 is automatically stopped and the apparatus returns to the standby state.

In this way, during standby, just by supplying power from the sub power supply section 2 to the main power supply section control circuit 6, transmission and reception can be started in the same way as in the conventional case. Furthermore, during standby, the lamp display function and telephone line network control function are not operated, and only the main power supply section control circuit 6, which has few structural requirements, is operated, so power consumption during standby is extremely small. Furthermore, since the supply of power to the main power supply section 3 is automatically stopped when the communication ends, there is no wastage of power. Further, the power supply device itself can be made smaller and can be constructed at low cost.

As is clear from the above embodiments, according to the present invention, the power supply unit of a facsimile transceiver is divided into a main power supply section and a sub power supply section, and power is always supplied to the sub power supply section. Since the sub power supply only operates the circuit that controls the supply of power to the main power supply, the power consumption of the facsimile transceiver during standby is much lower than in the past, making the power supply smaller and more compact. It is an object of the present invention to provide a power supply device for a facsimile transceiver that is excellent in practical terms, such as being able to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a facsimile transceiver to which an embodiment of the present invention is applied, and FIGS. 2 and 3 are waveform diagrams of essential parts of the main power supply section control circuit in FIG. 1. DESCRIPTION OF SYMBOLS 1... Power supply device, 2... Sub-power supply section, 3... Main power supply section, 4... Switch, 5... Main part of facsimile transceiver, 6... Main power supply section control circuit, 7
...Original presence/absence detection sensor, 8...Frequency detection circuit, 9...AND gate circuit, 10...SRFF circuit.

Claims (1)

[Scope of utility model registration request] a main power supply unit that operates a facsimile transceiver; and a main power supply unit control circuit that operates the main power supply unit within the time period from detection of a called signal during reception to detection of a transmitted document during transmission until the end of each communication; A power supply device for a facsimile transceiver, comprising: a sub power supply unit that supplies power to the main power supply unit control circuit even when the facsimile transceiver is on standby.