GB1582318A - Electrical supply arrangements for electric clocks - Google Patents
Electrical supply arrangements for electric clocks Download PDFInfo
- Publication number
- GB1582318A GB1582318A GB4523/78A GB452378A GB1582318A GB 1582318 A GB1582318 A GB 1582318A GB 4523/78 A GB4523/78 A GB 4523/78A GB 452378 A GB452378 A GB 452378A GB 1582318 A GB1582318 A GB 1582318A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- output
- accumulator
- arrangement
- mains
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001419 dependent effect Effects 0.000 claims description 11
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C10/00—Arrangements of electric power supplies in time pieces
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C15/00—Clocks driven by synchronous motors
- G04C15/0054—Clocks driven by synchronous motors with power-reserve
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Electromechanical Clocks (AREA)
Description
(54) ELECTRICAL SUPPLY ARRANGEMENTS
FOR ELECTRIC CLOCKS
(71) We, HELIOWATT WERKE ELEK- TRIZITATS-GESELLSCHAFT mbH, a German company, of Wilmersdorfer Strasse 39, 1000
Berlin 12, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to electrical supply arrangements for electric clocks, and is particularly but not exclusively concerned with time switches incorparating such arrangements.
There are known electronic clock drives comprising stepping motors, generally simple bipolar motors having permanent magnet rotors, which are activated by integrated switching circuits (for example, in accordance with the CMOS technique). There are used as energy sources, for example, dry batteries whose voltage is exactly known and whose voltage drop during their lifetime is only small.
Time switch clocks are usually supplied
with mains energy, an accumulator often being provided to act as an energy source in the event of mains failure. The accumulator is connected in parallel with the supply
voltage terminals of the drive arrangement
and charged, and kept fully charged, by a
small trickle current during mains operation.
However, accumulators, and particularly nickel-cadmium accumulators which are often used, have a tendency to spontaneous
short-circuiting, even when they are fully
charged. In the event of such a short-cir
cuit, the clock would stop even in mains
operation, in previously proposed arrange
ments of which we are aware.
Preferred embodiments of the invention
comprise time switches which are improved
in this respect.
According to the present invention, there
is provided an electrical supply arrangement for an electric clock, the arrangement comprising:
a first set of input terminals for receiving a mains supply;
a second set of input terminals for receiving a supply from an accumulator;
a set of output terminals for connection to a clock;
charging circuitry for charging an accumulator connected to the second set of input terminals when a mains supply is present at the first set of input terminals, the charging circuitry including in a resistance combination a temperature-dependent resistor having a specific temperature characteristic, for providing temperature compensation of the charging current; and
control circuitry arranged to provide on the output terminals an output constituted by or derived from the mains supply in normal use of the arrangement and the accumulator supply upon failure of the mains supply, the arrangement being such that, when a mains supply is present the second set of input terminals is isolated from the first set of input terminals and from the output terminals to the extent that, in the event of an accumulator being absent or defective, normal mains output from the output terminals is substantially unaffected.
To assist understanding of the invention, there will now be described, by way of example, a preferred embodiment of the invention, comprising an electric time switch which is provided with an electric clock having a stepping motor, gearing, a time dail, and exchangeable slidable members on the time dial for operating contacts of the switch.
The electric clock is also provided with an electrical supply arrangement which comprises first and second sets of input terminals, and a set of output terminals. The first set of input terminals is connected to receive a mains supply, and the second set of input terminals is connected to receive a supply from an accumulator, such as, for example, a nickel-cadmium accumulator.
The supply arrangement is arranged to provide an output on the output terminals, which are connected to supply the clock.
Under normal conditions of use, control circuitry of the supply arrangement provides on the output terminals an output derived from the mains supply. However, in the event of a failure of the mains supply, the control circuitry is arranged to provide on the output terminals an output derived from the accumulator supply. Whilst the clock is being supplied, under normal conditions, from the mains, charging circuitry of the supply arrangement is operative to charge the accumulator, and to maintain the accumulator fully charged.
The accumulator has its own separate charging circuit, and is not directly connected in parallel with the first set of input terminals. Thus, when a mains supply is present, the second set of input terminals is isolated from the first set of input terminals and from the output terminals to the extent that, in the event-of an accumulator being absent, or defective (for example short circuited), normal mains output from the output terminals is substantially unaffected.
Particularly in the case of nickel-cadmium accumulators, temperature compensation of the charging current is desirable both with normal cells and with sintered cells. For this purpose, the charging circuitry includes a resistance combination which consists of an ordinary resistor and a temperature-dependent resistor having a specific temperature characteristic. Preferably, the temperature-dependent resistor is readily removable such that it may be replaced by a temperature dependent resistor of different value, in dependence upon the type of accumulator being used with the supply arrangement.
It is conceivable that the output voltage of such a supply arrangement could flunctuate appreciably, both in mains operation and in accumulator operation. Thus, for example, depending upon the state of charge and the temperature, the voltage of two battery cells may vary between 2 volts and 3.2 volts. When the stepping motor of the clock is driven by a voltage generator, the current absorption and torque increase with the supply voltage. This is generally undesirable, because the motor may be caused to rotate jerkily, thus having a wearing effect on the gearing of the clock. In order to overcome this, therefore, the supply arrangement includes means for limiting the output current through the output terminals.
This is preferably achieved by employing a current-limited voltage generator to produce the output on the output terminals. As an alternative to this, a current generator may be employed, but this is generally less advantageous, because the motor circuit would be affected by the very high internal resistance of the generator. As a result of this, dynamic braking of the motor may effectively disappear, such that the motor tends to oscillate considerably about its positions of rest, possibly to the extent that the motor may rotate backwards under heavy loading.
Advantageously, the arrangement for limiting the current of the voltage generator is programmable, so as to permit adjustment of the limit of the output current through the output terminals.
Timing pulses for the clock are derived, in normal mains operation, from the mains frequency. However, this reference frequency is no longer available upon a mains failure.
For this reason, the supply arrangement includes an auxiliary reference frequency oscillator, which may be, for example, either an RC oscillator or a quartz oscillator. The auxiliary oscillator is arranged automatically to take over control of the supply arrangement in the event of mains failure.
The electrical supply arrangement is preferably an all-electronic arrangement, and is advantageously integrated on a large-scale switching circuit, for example, in accordance with the I3L-technology.
WHAT WE CLAIM IS:
1. An electrical supply arrangement for an electric clock, the arrangement comprising:
a first set of input terminals for receiving a mains supply;
a second set of input terminals for receiving a supply from an accumulator;
a set of output terminals for connection to a clock;
charging circuitry for charging an accumulator connected to the second set of input terminals when a mains supply is present at the first set of input terminals, the charging circuitry including in a resistance combination a temperature-dependent resistor having a specific temperature characteristic, for providing temperature compensation of the charging current; and
control circuitry arranged to provide on the output terminals an output constituted by or derived from the mains supply in normal use of the arrangement and the accumulator supply upon failure of the mains supply, the arrangement being such that, when a mains supply is present the second set of input terminals is isolated from the first set of input terminals and from the output terminals to the extent that, in the event of an accumulator being absent or defective, normal mains output from the output ter
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (16)
1. An electrical supply arrangement for an electric clock, the arrangement comprising:
a first set of input terminals for receiving a mains supply;
a second set of input terminals for receiving a supply from an accumulator;
a set of output terminals for connection to a clock;
charging circuitry for charging an accumulator connected to the second set of input terminals when a mains supply is present at the first set of input terminals, the charging circuitry including in a resistance combination a temperature-dependent resistor having a specific temperature characteristic, for providing temperature compensation of the charging current; and
control circuitry arranged to provide on the output terminals an output constituted by or derived from the mains supply in normal use of the arrangement and the accumulator supply upon failure of the mains supply, the arrangement being such that, when a mains supply is present the second set of input terminals is isolated from the first set of input terminals and from the output terminals to the extent that, in the event of an accumulator being absent or defective, normal mains output from the output ter
minals is substantially unaffected.
2. An arrangement according to claim 1, wherein the temperature-dependent resistor is readily removable such that it may be replaced by a temperature-dependent resistor of different value in dependence upon the type of accumulator to be used with the arrangement.
3. An arrangement according to claim 1 or 2, including means for limiting the output current through the ouput terminals.
4. An arrangement according to claim 3, wherein the current-limiting means is programmable so as to permit adjustment of the limit of the output current through the output terminals.
5. An arrangement according to any preceding claim, including a reference frequency oscillator, the control circuitry being arranged to respond to a frequency of a mains supply when present and to respond to an output of the oscillator upon failure of the mains supply.
6. An arrangement according to claim 3 or 4 or to claim 5 as appendant thereto, including a voltage generator for providing the output on the output terminals.
7. An arrangement according to any preceding claim, arranged to provide on the output terminals an output suitable for driving a stepping motor.
8. An arrangement according to any preceding claim, being an all-electronic arrangement.
9. An arrangement according to claim 8, constructed as an integrated circuit.
10. An arrangement according to any preceding claim, including the accumulator.
11. An arrangement according to claim 10, wherein the accumulator is a nickelcadmium accumulator.
12. An electrical supply arrangement according to claim 1 and substantially as hereinbefore described.
13. An electric clock provided with a supply arrangement according to any preceding claim.
14. An electric clock having a stepping motor and provided with a supply arrangement according to claim 12, or to claim 7, or to any one of claims 8 to 11 as appendant to claim 7.
15. An electric time switch provided with a clock according to claim 13 or 14.
16. A time switch according to claim 15, including gearing, a time dial, and exchangeable slideable members on the time dial for operating contacts of the switch.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772705919 DE2705919A1 (en) | 1977-02-09 | 1977-02-09 | ELECTRONIC DRIVE SWITCH FOR TIME SWITCHES |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1582318A true GB1582318A (en) | 1981-01-07 |
Family
ID=6000977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4523/78A Expired GB1582318A (en) | 1977-02-09 | 1978-02-03 | Electrical supply arrangements for electric clocks |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE863498A (en) |
DE (1) | DE2705919A1 (en) |
DK (1) | DK56878A (en) |
FR (1) | FR2380582A1 (en) |
GB (1) | GB1582318A (en) |
IE (1) | IE46201B1 (en) |
IT (1) | IT1092390B (en) |
LU (1) | LU78837A1 (en) |
NL (1) | NL7714130A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130449A (en) * | 1982-11-16 | 1984-05-31 | Schlumberger Electronics | Time switches |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3910039A1 (en) * | 1989-03-28 | 1990-10-04 | Legrand Gmbh | CIRCUIT DEVICE FOR BRIDGING THE FAILURE OF A PRIMARY ENERGY SOURCE, e.g. AC POWER NETWORK, FOR CONTINUOUSLY REDUNDANTLY UNINTERRUPTIBLE SUPPLY OF ELECTRONIC CONTROL AND CONTROL DEVICES, ESPECIALLY |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2112003B1 (en) * | 1970-03-24 | 1974-03-01 | Vedette Horlogerie | |
DE2058798A1 (en) * | 1970-11-30 | 1972-05-31 | Westdeutsche Elektrogeraete | Timer with electric drive |
CH16172A4 (en) * | 1972-01-06 | 1973-04-13 | ||
DE2344823A1 (en) * | 1972-09-15 | 1974-03-21 | Horstmann Gear Co Ltd | CLOCK GENERATOR FOR TIMER |
-
1977
- 1977-02-09 DE DE19772705919 patent/DE2705919A1/en not_active Withdrawn
- 1977-12-20 NL NL7714130A patent/NL7714130A/en not_active Application Discontinuation
-
1978
- 1978-01-09 LU LU78837A patent/LU78837A1/en unknown
- 1978-01-31 BE BE184772A patent/BE863498A/en unknown
- 1978-02-03 GB GB4523/78A patent/GB1582318A/en not_active Expired
- 1978-02-03 IT IT19962/78A patent/IT1092390B/en active
- 1978-02-06 IE IE255/78A patent/IE46201B1/en unknown
- 1978-02-08 FR FR7803590A patent/FR2380582A1/en not_active Withdrawn
- 1978-02-08 DK DK56878A patent/DK56878A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2130449A (en) * | 1982-11-16 | 1984-05-31 | Schlumberger Electronics | Time switches |
Also Published As
Publication number | Publication date |
---|---|
LU78837A1 (en) | 1978-06-09 |
FR2380582A1 (en) | 1978-09-08 |
DE2705919A1 (en) | 1978-08-10 |
NL7714130A (en) | 1978-08-11 |
IT1092390B (en) | 1985-07-12 |
IE46201B1 (en) | 1983-03-23 |
DK56878A (en) | 1978-08-10 |
BE863498A (en) | 1978-05-16 |
IE780255L (en) | 1978-08-09 |
IT7819962A0 (en) | 1978-02-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |