CA1107843A - Time controlled thermostat - Google Patents
Time controlled thermostatInfo
- Publication number
- CA1107843A CA1107843A CA358,700A CA358700A CA1107843A CA 1107843 A CA1107843 A CA 1107843A CA 358700 A CA358700 A CA 358700A CA 1107843 A CA1107843 A CA 1107843A
- Authority
- CA
- Canada
- Prior art keywords
- wires
- current
- clock
- thermostat
- diodes
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A two wire rechargeable battery powered electric time controlled thermostat apparatus adapted to be connected by two wires to a source of al-ternating current voltage and control apparatus for controlling the supply of temperature condition medium to the space wherein the thermostat is located with a rectifying circuit means in the thermostat apparatus for recharging the battery from the source over the two wires.
A two wire rechargeable battery powered electric time controlled thermostat apparatus adapted to be connected by two wires to a source of al-ternating current voltage and control apparatus for controlling the supply of temperature condition medium to the space wherein the thermostat is located with a rectifying circuit means in the thermostat apparatus for recharging the battery from the source over the two wires.
Description
1~7843 This application is a division of our Canadian patent application Serial No. 264, 907 filed November 4, 1976.
Time controlled or electric clock thermostats have for many years required at least three wires to connect the thermostat to a remote source of power and a control apparatus for a system for controlling the supply of temperature condition medium to the space wherein the thermostat is located.
In the modification of original construction in which two wires are required for a simple thermostat, considerable difficulty is experienced when the system is to be converted for use with a clock thermostat as extra wires are pulled through the wall.
To overcome the necessity of pulling extra wires to power a clock thermostat over the same two wires on which the control apparatus is control-led, various expensive schemes have been provided such as in the United States Clifford L. Nelson et al Patent 3,620,448, issued November 16, 1971, and the United States Balthasar H. Pinckaers Patent 3,599,863, issued August 17, 1971, wherein the clock motor is powered over the two wires and a signal of a dif-ferent power factor or waveform is superimposed over the two wires for con-trolling the remote control apparatus.
Obviously, with the advent of lower power, extremely accurate battery driven time controlled units or clocks, such as the crystal oscilla-tor type now available, the use of such a motor for powering an electric clock thermostat has been proposed, however, because of the torque require-ment that the motor must have to do the added work of directly moving a mechanism which changes the temperature maintained in the space, power re-quired from such a battery is large enough that frequent changing or recharg-ing of the battery must be accomplished.
The present invention provides a rechargeable battery powered ~7~343 electric clock thermostat for use in a system for controlling remote control apparatus over two wires and for connecting the battery through a charging circuit over the same two wires to a remote power source; so that, an electric clock thermostat can be used to replace a simple thermostat without the expense of additional wires for providing a control circuit for the thermostat and an energization circuit for the clock motor.
Thus, in accordance with a broad aspect of the invention, there is provided a clock thermostat device for connection by two wires to a remote unit comprising an alternating current power source and a control apparatus responsive to A.C. current for operation of temperature conditioning appara-tus, comprising:
thermostat means having selectable temperature control points and having a thermostatic switch for operating at a selected control point, said thermostat means responsive to ambient temperature for opening and closing of said thermostatic switch when said ambient temperature varies a determined amount from said selected control point, said switch for providing A.C. cur-rent over the two wires to energize the control apparatus;
clock means for cyclically changing said selected control point of said thermostatic means from an initial value to a second value at a first time, and at a second time thereafter restoring said control point to said initial value;
rechargeable battery means for providing energy for said clock means independent of the two wires; and rectifying means for connection to the two wires for providing charging current to said battery means and providing a return current path between the two wires for the positive cycle of said alternating current power source and a return current path between the two wires for the negative ., -2-~1~7~343 cycle of said alternating current power source, whereby the control apparatus receives a continuous A.C. current along the two wires.
- The embodiments of the present invention are shown in the follow-ing figures of which Figure 1 is a schematic showing of the connection of a battery powered time controlled thermostat apparatus to a remote source of power and control apparatus for controlling the supply of temperature condition medium to the space in which the thermostat is mounted, and Figure 2 is a first embodiment of the present invention, and Figure 3 is another embodiment of the invention, and Figure 4 is still another embodiment of the invention.
DESCRIPTION OF THE INVENTION
Referring ~o Figure 1, the temperature in a space 10 is controlled by a temperature responsive device or thermostat apparatus 11 connected by two wires 12 and 13 to a remote control panel 14. Panel 14 has a source of power 15 and an output circuit 20 connected to a control apparatus or valve 21 of a system for controlling the supply of fuel or gas to a temperature conditioning apparatus or furnace 22 for temperature conditioning or heating medium or air being circulated through the space 10 through duct 23 by a fan 24.
Thermostat apparatus 11 has a temperature responsive control means or mechanism for maintaining one of two different levels of temperature or bimetal operated switch means 25, such as a clock thermostat disclosed in the United States Carl. G Kronmiller Patent 2,558,617, issued June 26, 1951, comprising a bimetal element which controls a switch to complete a circuit to provide power to remote control apparatus 21. The temperature control of the thermostat apparatus 11 is adjusted by a time controlled mechanism or clock driven by a motor 30 to selectively adjust the control temperature ~7~343 maintained during different time periods to typically maintain a daytime temperature of 72 and at 10:00 p.m. to change the control point of the ther-mostat to maintain a nighttime temperature of 65 until morning when the day-time temperature is again selected. Any one particular type of thermostat apparatus 11 for selectively maintaining different controlled temperatures in a space 10 is not required for use in the present invention. Motor 30 is a rechargeable battery powered motor connected to a battery 32 which is re-charged over the same two wires 12 and 13 by a charging circuit to be des-cribed.
Referring to Figure 2, thermostat 11 is shown connected to panel 14 for controlling control apparatus or valve 21. Temperature responsive switch 25 is adapted to connect the control circuit to the source of power 15 to energize valve 21. Circuit 31 is an adjustable circuit for energizing conventional anticipation heater 26 thermally connected to temperature re-sponsive switch means 25. The voltage to heater 26, can be adjusted by selectively positioning input tap 27 to regulate the control of thermostat switch 25. Motor 30 is connected to rechargeable battery 32 for driving the time controlled mechanism of thermostat 11. One terminal of battery 32 is connected by conductor 33 to a diode 34 to wire 12 and the other terminal of the battery is connected by conductor 35 through a limiting resistor 40 to the other wire 13 for providing a charging circuit to battery 32.
The battery is charged from source 15 all the time. By means of a limiting resistor 40, the current drain from the source for the recharging of the battery is limited below that required to operate valve 21. The valve 21 will not operate when the thermostat is not calling for heat.
The embodiment of the invention shown in Figure 3 comprises the thermostat 11 connected over wires 12 and 13 to panel 14 with the source of ~i7~343 power 15 and valve 21. The thermostat switch 25 is connected in parallel with motor 30 so that when the switch is open current is supplied through the diode 34 to recharge battery 32. A limiting resistor 40 is connected to limit the current to prevent the operation of valve 21.
The embodiment of the invention as shown in Figure 4 has a ther-mostat 11 connected over two wires 12 and 13 to a remote panel 14 having a source of power 15 and a valve 21. Rectifying means 34 for supplying power to recharge battery 32 comprises a conventional diode bridge for providing a rectifying current during both cycles of the alternating current voltage of source 15. The current drain from the source is limited by limiting re-sistor 40.
Time controlled or electric clock thermostats have for many years required at least three wires to connect the thermostat to a remote source of power and a control apparatus for a system for controlling the supply of temperature condition medium to the space wherein the thermostat is located.
In the modification of original construction in which two wires are required for a simple thermostat, considerable difficulty is experienced when the system is to be converted for use with a clock thermostat as extra wires are pulled through the wall.
To overcome the necessity of pulling extra wires to power a clock thermostat over the same two wires on which the control apparatus is control-led, various expensive schemes have been provided such as in the United States Clifford L. Nelson et al Patent 3,620,448, issued November 16, 1971, and the United States Balthasar H. Pinckaers Patent 3,599,863, issued August 17, 1971, wherein the clock motor is powered over the two wires and a signal of a dif-ferent power factor or waveform is superimposed over the two wires for con-trolling the remote control apparatus.
Obviously, with the advent of lower power, extremely accurate battery driven time controlled units or clocks, such as the crystal oscilla-tor type now available, the use of such a motor for powering an electric clock thermostat has been proposed, however, because of the torque require-ment that the motor must have to do the added work of directly moving a mechanism which changes the temperature maintained in the space, power re-quired from such a battery is large enough that frequent changing or recharg-ing of the battery must be accomplished.
The present invention provides a rechargeable battery powered ~7~343 electric clock thermostat for use in a system for controlling remote control apparatus over two wires and for connecting the battery through a charging circuit over the same two wires to a remote power source; so that, an electric clock thermostat can be used to replace a simple thermostat without the expense of additional wires for providing a control circuit for the thermostat and an energization circuit for the clock motor.
Thus, in accordance with a broad aspect of the invention, there is provided a clock thermostat device for connection by two wires to a remote unit comprising an alternating current power source and a control apparatus responsive to A.C. current for operation of temperature conditioning appara-tus, comprising:
thermostat means having selectable temperature control points and having a thermostatic switch for operating at a selected control point, said thermostat means responsive to ambient temperature for opening and closing of said thermostatic switch when said ambient temperature varies a determined amount from said selected control point, said switch for providing A.C. cur-rent over the two wires to energize the control apparatus;
clock means for cyclically changing said selected control point of said thermostatic means from an initial value to a second value at a first time, and at a second time thereafter restoring said control point to said initial value;
rechargeable battery means for providing energy for said clock means independent of the two wires; and rectifying means for connection to the two wires for providing charging current to said battery means and providing a return current path between the two wires for the positive cycle of said alternating current power source and a return current path between the two wires for the negative ., -2-~1~7~343 cycle of said alternating current power source, whereby the control apparatus receives a continuous A.C. current along the two wires.
- The embodiments of the present invention are shown in the follow-ing figures of which Figure 1 is a schematic showing of the connection of a battery powered time controlled thermostat apparatus to a remote source of power and control apparatus for controlling the supply of temperature condition medium to the space in which the thermostat is mounted, and Figure 2 is a first embodiment of the present invention, and Figure 3 is another embodiment of the invention, and Figure 4 is still another embodiment of the invention.
DESCRIPTION OF THE INVENTION
Referring ~o Figure 1, the temperature in a space 10 is controlled by a temperature responsive device or thermostat apparatus 11 connected by two wires 12 and 13 to a remote control panel 14. Panel 14 has a source of power 15 and an output circuit 20 connected to a control apparatus or valve 21 of a system for controlling the supply of fuel or gas to a temperature conditioning apparatus or furnace 22 for temperature conditioning or heating medium or air being circulated through the space 10 through duct 23 by a fan 24.
Thermostat apparatus 11 has a temperature responsive control means or mechanism for maintaining one of two different levels of temperature or bimetal operated switch means 25, such as a clock thermostat disclosed in the United States Carl. G Kronmiller Patent 2,558,617, issued June 26, 1951, comprising a bimetal element which controls a switch to complete a circuit to provide power to remote control apparatus 21. The temperature control of the thermostat apparatus 11 is adjusted by a time controlled mechanism or clock driven by a motor 30 to selectively adjust the control temperature ~7~343 maintained during different time periods to typically maintain a daytime temperature of 72 and at 10:00 p.m. to change the control point of the ther-mostat to maintain a nighttime temperature of 65 until morning when the day-time temperature is again selected. Any one particular type of thermostat apparatus 11 for selectively maintaining different controlled temperatures in a space 10 is not required for use in the present invention. Motor 30 is a rechargeable battery powered motor connected to a battery 32 which is re-charged over the same two wires 12 and 13 by a charging circuit to be des-cribed.
Referring to Figure 2, thermostat 11 is shown connected to panel 14 for controlling control apparatus or valve 21. Temperature responsive switch 25 is adapted to connect the control circuit to the source of power 15 to energize valve 21. Circuit 31 is an adjustable circuit for energizing conventional anticipation heater 26 thermally connected to temperature re-sponsive switch means 25. The voltage to heater 26, can be adjusted by selectively positioning input tap 27 to regulate the control of thermostat switch 25. Motor 30 is connected to rechargeable battery 32 for driving the time controlled mechanism of thermostat 11. One terminal of battery 32 is connected by conductor 33 to a diode 34 to wire 12 and the other terminal of the battery is connected by conductor 35 through a limiting resistor 40 to the other wire 13 for providing a charging circuit to battery 32.
The battery is charged from source 15 all the time. By means of a limiting resistor 40, the current drain from the source for the recharging of the battery is limited below that required to operate valve 21. The valve 21 will not operate when the thermostat is not calling for heat.
The embodiment of the invention shown in Figure 3 comprises the thermostat 11 connected over wires 12 and 13 to panel 14 with the source of ~i7~343 power 15 and valve 21. The thermostat switch 25 is connected in parallel with motor 30 so that when the switch is open current is supplied through the diode 34 to recharge battery 32. A limiting resistor 40 is connected to limit the current to prevent the operation of valve 21.
The embodiment of the invention as shown in Figure 4 has a ther-mostat 11 connected over two wires 12 and 13 to a remote panel 14 having a source of power 15 and a valve 21. Rectifying means 34 for supplying power to recharge battery 32 comprises a conventional diode bridge for providing a rectifying current during both cycles of the alternating current voltage of source 15. The current drain from the source is limited by limiting re-sistor 40.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A clock thermostat device for connection by two wires to a remote unit comprising an alternating current power source and a control apparatus responsive to A.C. current for operation of temperature conditioning appara-tus, comprising:
thermostat means having selectable temperature control points and having a thermostatic switch for operating at a selected control point, said thermostat means responsive to ambient temperature for opening and closing of said thermostatic switch when said ambient temperature varies a determined amount from said selected control point, said switch for providing A.C. cur-rent over the two wires to energize the control apparatus;
clock means for cyclically changing said selected control point of said thermostatic means from an initial value to a second value at a first time, and at a second time thereafter restoring said control point to said initial value;
rechargeable battery means for providing energy for said clock means independent of the two wires; and rectifying means for connection to the two wires for providing charging current to said battery means and providing a return current path between the two wires for the positive cycle of said alternating current power source and a return current path between the two wires for the negative cycle of said alternating current power source, whereby the control apparatus receives a continuous A.C. current along the two wires.
thermostat means having selectable temperature control points and having a thermostatic switch for operating at a selected control point, said thermostat means responsive to ambient temperature for opening and closing of said thermostatic switch when said ambient temperature varies a determined amount from said selected control point, said switch for providing A.C. cur-rent over the two wires to energize the control apparatus;
clock means for cyclically changing said selected control point of said thermostatic means from an initial value to a second value at a first time, and at a second time thereafter restoring said control point to said initial value;
rechargeable battery means for providing energy for said clock means independent of the two wires; and rectifying means for connection to the two wires for providing charging current to said battery means and providing a return current path between the two wires for the positive cycle of said alternating current power source and a return current path between the two wires for the negative cycle of said alternating current power source, whereby the control apparatus receives a continuous A.C. current along the two wires.
2. A clock thermostat device according to claim 1, wherein said rec-tifying means provides charging current to said battery means on both cycles of the alternating current power source.
3. A clock thermostat device according to claim 2, wherein said rectifying means comprises a diode bridge circuit.
4. A clock thermostat device according to claim 1, wherein said rec-tifying means comprises at least two diodes, one of said diodes providing said return current path for the positive cycle of the alternating current source and the other of said diodes providing said return current path for the negative cycle of the alternating current source.
5. A clock thermostat device according to claim 1, and further includ-ing current limiting means connected between the power source and said recti-fying means for limiting the A.C. current drawn over the two wires prior to the A.C. current entering said rectifying means, whereby a limited A.C. cur-rent passes to the control apparatus from said rectifying means.
6. A clock thermostat device according to claim 5 and further includ-ing means for connecting said thermostatic switch across the two wires at a location between the power source and said current limiting means, for provid-ing an A.C. current of a magnitude greater, than said limited A.C. current from said rectifying means, to the control apparatus for commanding operation of the temperature conditioning apparatus.
. 7. The clock thermostat of claim 1 wherein said rectifying means charges said battery means on at least one of said cycles.
8. A clock thermostat device according to claim 4, wherein said rectifying means comprises at least two diodes, a first of said diodes being connected between one of said two wires and one side of said battery means, and a second of said diodes being connected between a junction of said one of said two wires and said first diode and the other side of said battery means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA358,700A CA1107843A (en) | 1975-12-10 | 1980-08-20 | Time controlled thermostat |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63952375A | 1975-12-10 | 1975-12-10 | |
| US639,523 | 1975-12-10 | ||
| CA264,907A CA1090443A (en) | 1975-12-10 | 1976-11-04 | Time controlled thermostat with battery operated timer |
| CA358,700A CA1107843A (en) | 1975-12-10 | 1980-08-20 | Time controlled thermostat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1107843A true CA1107843A (en) | 1981-08-25 |
Family
ID=27164748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA358,700A Expired CA1107843A (en) | 1975-12-10 | 1980-08-20 | Time controlled thermostat |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1107843A (en) |
-
1980
- 1980-08-20 CA CA358,700A patent/CA1107843A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |