JPS6043958A - Power supply circuit - Google Patents

Abstract

PURPOSE:To prevent the generation of a fault (latchup) at the restoration of power failure by allowing a relay to monitor normally the power feeding state of a DC voltage and allowing the relay to be changed over automatically to the power feeding from an auxiliary power supply to a volatile storage device if the power supply is stopped. CONSTITUTION:When a DC voltage V0 is supplied from an external power supply, the relay A is activated and the DC voltage V0 regulated to a prescribed voltage by a constant voltage diode ZD is fed to the volatile storage device via a diode DO as a DC voltage V2. Further, a DC voltage V1 is fed to other circuit via a contact a2. If the supply of the DC voltage V0 from the external power supply is stopped because of power failure or the like, the relay A is restored, the contact a1 is made conductive and a contact a2 is blocked. As a result, a DC voltage V2 to the volatile storage device is fed immediately from the auxiliary power supply BO via the contact a1 and a diode D4. When the external power supply is restored, the power supply from the auxiliary power supply BO is blocked.

Description

[Detailed explanation of the invention] (The invention of the AL investigation is the final invention of the telephone 6III, especially from the external power supply (Ko,! 'tIi Regarding improvements to the wholesale supply circuit.

Background of the technology Telephone terminal devices that have many functions in addition to the basic functions such as making and receiving calls and making calls are being put into practical use.Such telephone terminal devices are micro In many cases, they are equipped with brosenozu', volatilization equipment, etc., and there is often a lack of power due to the power supply from the attached automatic switchboard, and a local power supply is required. In the event that power cannot be supplied due to a power outage or other reason, Volatile Notes 1.1 will continue to supply power to maintain the memory contents of the device, and will also maintain basic functions as a telephone such as making and receiving calls and making calls. In many cases, an auxiliary battery is used to continuously supply power to only the minimum necessary circuits.

FC+ Prior Art and Problems Part 1 is a diagram showing an example of a conventional power supply circuit in a telephone terminal device. In FIG. 1, a DC voltage VO supplied from an external power source (not shown) is made constant by a constant voltage diode 1''ZD, and then is connected to the voltage inside the telephone 1'f11i terminal via a diode Do. A clear current voltage v1 is supplied to the circuits other than the volatile memory device, and a direct current voltage V2 is further supplied to the volatile memory device 1a via the diode 1. In addition, auxiliary batteries +30 and B1 for DC voltage ■1 and O+V2 are installed, and when DC voltage VO is being supplied, diodes -11)2 and resistor R1, as well as diodes n3, 'r, and No. 1 (
wa "i', charged via R2.Commercial electricity high
When the power supply of the DC voltage VQ is stopped due to a stoppage of the DC voltage V24;
I aid? +1' from the pond I through diode D5
l', '', supplied to I, and also volatilized 1 (1-Note 131
Circuits other than the equipment 1' 1 current voltage X for i-i,
By connecting IlυJ゛use of the telephone terminal device to 1 or switch SW,
! ! 13 (l Karataio 1'D 4 Oyohisui Isochi SW is supplied via 7.Auxiliary battery B)
The voltage is set to be lower than that of the auxiliary battery IF, O, which is sufficient to hold the contents of the note 1a of the 111μ emission note 1a Y:'U:. Eventually, when the power supply of DC voltage ■0 is started again from the external electric melter, DC type 1g'lE V I and ■2 are supplied with DC voltage VO.
B I Karano power supply? :tlffill is fake. In fact, if the user never left the switch SW in the 1!11 stopped state, the auxiliary power/li! As is clear from the above explanation, in conventional power supply circuits, when the power supply from an external power source is stopped and restored, the user has to create one Suinona SW each time. The most inconvenient part is that Q< (, for DC voltage (2) where instantaneous power outages are not allowed, it is necessary to install an auxiliary battery B1 separately, which supplies power without going through the switch SW. ,
Is it a drawback that it becomes uneconomical?

Ta. In addition, in order to make the auxiliary battery B1 economical, the DC voltage V2
4; Although the voltage G is set lower than the DC voltage Vl,
Therefore, C-M is used for volatile storage devices and other circuits.
When an O3 integrated circuit is used, failures (for example, latch-up phenomenon) due to the potential difference between the oil flow voltages V1 and 2 are likely to occur.

Furthermore, if the user forgets to open the switch SW even after the power outage is restored, the Teisukeden/li+ 8 [1 or more discharge will continue.
J. becomes unusable in the event of a power outage.

(di Object of the Invention 1) The object of the present invention is to eliminate the drawbacks of the conventional power supply circuit as described above, and to stop the power supply from the Tokyo Electric Power Supply circuit. Vengeful I!?A t'2 use,
The object of the present invention is to economically realize a power supply circuit that can actually supply DC voltage to 6'1F without requiring any operation of H and without any interference.

(+・) +111 of the invention for θ 1 hit, 1, power supply from external 1°h source is stopped) 2, 111 that is supplied with power from Urasuke Electric Power 11mu! Farewell 1. Connect the circuit containing the device a to the telephone terminal device, and set up a relay to monitor the power supply from the above city/Ij:j, and either the I- or the power supply C;! +1
If detects 7 + iii volatile 1, 1) sea i
i'? 'r: 1 sentence 11-, <+ i'+il Close the power supply circuit from the auxiliary battery 5, the volatilization, 11I,
Lid device (required times 1 W! I 1i1
2 ill! The power supply circuit of the auxiliary battery (-) connects the telephone to 11
．． 1st device's (1, ('';1°1' slotted socks, inna is off-hook, ], 2nd device, 2nd closing position)
・Achievement is achieved by 1-.

(1) Examples of the invention 19 No. 1. An embodiment of the present invention will be explained with reference to the drawings.

ε152 If in one embodiment of the present invention, the power supply circuit is shown in small pieces 1, 2,). In case I, relay A for monitoring the power supply status of external 77 (+ power supply or -, DC'1 old 1-■0 is installed only, and only one auxiliary battery I3o is connected) It is being When a voltage vO of 111 J is connected from an external power source (not shown), c, j, and relay Δ are in operation, and the contact point, λ
I 4; 1: ill, +I- state, contact d2 L;
l Maintain conduction. The result>jh Ichikawa Taioh
t, which is maintained at a voltage A;
= ill flow market pressure V04;
1 through 1; 1f,! Apply DC voltage V2 to the device (
DC voltage 1 is supplied to the 11 old 11B of the 11 former 11B of the 11 former 11B of 11 of /Ko Auxiliary 1-LL Pond B O is Ui Den 11, blasphemy~(
By DC voltage VO via O11)2 and O/resistor R1? ) is filled '1b. For f'-den et al. J, Is the power supplied from the external tt source to the curved flow 1h pressure VO?

As a result, the target for the storage device is 1i1i.
V2ε31 Sode assistant battery 130 to contact d1 and Q die:
Power is immediately supplied via t-F'D4. In addition, until the contact point, Il) J'4y is in the open state, the direct '/J
i tHJE V 2 L, 1 jilt7:'+° suck 1
1. M Jll c=maintained by the charging voltage of the capacitor C installed LJ;
/ There is no interruption of power supply.

Intermediary (DC voltage for circuits other than II memory device ■IG
91 The user of the telephone terminal device picks up the handset and
Each time you perform an operation such as
LJ, the auxiliary battery is 1'30. If that's the case, 1. Power can be supplied via U7 via J, l, Dio-II) 4 and Funokusui, -1-II S.

Eventually, an external power supply
When power supply to O starts, relay A changes to 111'0'.
til+sakufu! ) 1 'DC' voltage V1 and ■
2 is supplied with power from III and VO, and power is supplied from auxiliary battery BO or L'.

As is clear from the above description, according to this embodiment, C1, L・-Δ constantly monitors the power supply state of DC voltage VO. 1.
! U7, 1118 emitted when the power supply is cut off (equipment 1a)
In contrast, since the power supply is switched to the auxiliary battery +30 in terms of l'l and 1ilJ, the use of -H is completely unnecessary. In addition, Volatile Record / li: H Maki Iiyu)'s I Raku niri / I is Funkusuinochi 11s/I'; 4
Since power is supplied from one auxiliary battery 0 or C2 only when it is in the sonar state, the power consumption of the auxiliary battery BO is 4; t: i'i
i'1 is reduced, and it becomes possible to supply DC voltages 1 and V2 from the same auxiliary battery 1'30. ) is eliminated.

Note that FIG. 2 is only one embodiment of the present invention, and the configuration of the power supply circuit, for example, may be based on what is shown in the figure. In either case, the advantages of the present invention do not change.

fgl Reno Effects of the Invention - 14 According to this invention, 111i telephone terminal device b
In case of power outage and power outage (~CC), it is possible to supply free current voltage to the 111 system every time a failure occurs during power outage and power outage recovery, without requiring any operation by the user. The power supply circuit can be realized economically.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional power supply circuit, and FIG. 2 is a diagram showing a power supply circuit according to an embodiment of the present invention. In the figure, A is a relay, BO and 131 are auxiliary batteries, C is a auxiliary battery, I) 0 to 1) 6 i;
to R3 are resistors 1°l: ,, S W +; I switch, VO to V2 are DC voltage, 7, 1') i; + constant'
Ichizuki - Quioto, not shown.

Claims (1)

[Claims] Volatile energy supplied from the auxiliary battery when the power supply from the source is stopped! In a non-Xl11711.1 device that is equipped with a circuit including the iQ device mentioned above, a relay is installed to view the power supply from the external power supply as 'ij:i', and when the relay detects the power supply stop 1, the volatilization The power supply circuit from the auxiliary battery to the storage device is closed, and the power supply circuit from the auxiliary battery to the necessary circuits other than the volatile storage device is 1); A power supply circuit characterized in that it closes when a hook-up or an off-hook state occurs.