GB2274179A - Power supply controller - Google Patents
Power supply controller Download PDFInfo
- Publication number
- GB2274179A GB2274179A GB9225552A GB9225552A GB2274179A GB 2274179 A GB2274179 A GB 2274179A GB 9225552 A GB9225552 A GB 9225552A GB 9225552 A GB9225552 A GB 9225552A GB 2274179 A GB2274179 A GB 2274179A
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- Prior art keywords
- power
- cycle
- power supply
- time
- supply
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
- G05D23/1923—Control of temperature characterised by the use of electric means characterised by the type of controller using thermal energy, the cost of which varies in function of time
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A power supply control apparatus for controlling the supply of power from a power supply to an electrical appliance is provided for use where the power supply provides a supply of power only periodically with periods having a cyclical pattern eg. off-peak electricity to an electric storage heater. The apparatus comprises a processing unit (1) for monitoring the supply of power and storing in a memory a pattern of data indicative of the time power is available from the power supply during a cycle. The output drive (3) is controlled by the processing unit (1) to switch the power available from the power supply to an electrical appliance. The processing unit (1) controls the output drive (3) to supply power to the electrical appliance for a desired total energising period during the time power is available from the power supply in each successive similar cycle. <IMAGE>
Description
POWER SUPPLY CONTROLLER
The present invention relates to a method and apparatus for the control of the supply of power from a power supply to an electrical appliance, particularly where the power supply provides a supply of power only periodically with periods having a cyclical pattern.
Electricity utilities provide cheap mains electricity at certain times during the day usually called the off-peak period or periods. There are many electrical appliances which can make use of this cheap rate electricity in order to reduce the consumer's electricity bill. One such device is a storage heating system which is designed to take energy from the mains supply during an off-peak period, usually overnight, to charge up a thermal storage medium. Controls are fitted into the heating system to control the energy input to the storage medium during the off-peak period.Various types of control are traditionally fitted such as a simple thermostat controlling the maximum temperature of the storage medium in the storage heater, an outside temperature measuring system which controls the amount of stored energy according to weather conditions, and room temperature measuring devices which control the amount of stored energy according to the heat required to maintain a comfort level in the room.
The latter two types of control are the preferred types, since the charge is adjusted according to the prevailing conditions. Unfortunately, in heating systems to date the heating system is usually turned on at the beginning of the off-peak power supply period. This causes a peak in demand of electricity at the beginning of the off-peak period. Such peak demand is now causing concern to electricity utilities.
To overcome this problem "back charging" systems have been designed utilising outside and room temperature measuring devices. Such systems are not switched on until after a delay time following availability of off-peak electricity. Such a delay is calculated according to prevailing conditions.
This latter type of heating system avoids the peak demand at the start of the off-peak period but where the off-peak period is not provided as a single long period the system will not work.
It is common practice nowadays to split the off-peak period, which is typically seven hours, into two or more periods with a total time of seven hours. This is further complicated by the fact that different electricity utilities may use different splits and may provide off-peak periods having differing total durations. In addition, as circumstances change, the utilities may change their splits and totals.
Therefore, it is an object of the present invention to provide a power supply control arrangement which can overcome these difficulties and make efficient use of varying off-peak periods.
The present invention provides a power supply control apparatus for controlling the supply of power from a power supply to an electrical appliance, where said power supply provides a supply of power only periodically with periods having a cyclical pattern, said apparatus comprising memory means; processing means adapted to monitor the supply of power and store in said memory means a pattern of data indicative of the time power is available from said power supply during a cycle; and switch means operable to switch the power available from said power supply to said electrical appliance; wherein said processing means is adapted to control said switch means to supply power to said electrical appliance for a desired total energising period during the time power is available from said power supply in each successive similar cycle.
Preferably the control apparatus includes a clock means to provide a measure of time during a cycle and said processing means is adapted to use said measure of time to form said data. The clock means is further preferably adapted to provide a measure of time over a twenty four hour period.
In different embodiments the data indicative of the time power is available can be stored in three ways.
1) As the or each time at which the supply of power becomes available and the or each time at which the supply of power becomes no longer available during a cycle.
2) As the or each time during a cycle at which the supply of power becomes available and the associated duration of time for which power is available following the or each said time.
3) The data can be stored in the form of successive data bits where each data bit represents availability of power over an interval of time. In this method the availability of power is measured at regular intervals in time to form the successive data bits. Such data bits could be stored for instance using a shift register.
In one embodiment of the present invention when the processing means is energised either following a power failure or initially, the supply of power is monitored for the first cycle and data indicative of the time power is available from the power supply is stored in the memory means during said cycle. Also, the switch means is controlled to supply power to the electrical appliance for either the whole time power is available from said power supply during said cycle or where the times at which power becomes available and no longer available are an integer number of predetermined periods of time, during a number of discrete periods during each said predetermined period of time when power is available from the power supply during said cycle (the number, pattern and duration of said discrete periods being predetermined).
In another embodiment of the present invention the processing means is adapted to compare the cyclical pattern of power being supplied to said power supply with the pattern of data stored in said memory. If it is determined that the patterns are not the same, said processing means is adapted to control said switch means to supply power to said electrical appliance either during the whole time power is available from said power supply during said cycle or, where the times at which power becomes available and no longer available are an integer number of predetermined periods of time, during a number of discrete periods during each said predetermined period of time when power is available from the power supply during said cycle (the number, pattern and duration of said discrete periods being predetermined). The processing means is also adapted to store in said memory means data indicative of the time power is available from said power supply during said cycle.
In one embodiment said processing means is adapted o control said switch means to supply power to said electrical appliance during at least one energising period having a total period of time equal to said desired total energising period, and said processing means includes preselection means adapted to preselect the number of energising periods and the relative positions within the cyclical pattern that said switch means is controlled to supply power to said electrical appliance.
Preferably the processing means is adapted to monitor the power demand of said electrical appliance to calculate the desired total energising period. In one embodiment where the electrical appliance comprises a storage heater with a user settable control to set the desired temperature of a room this can be achieved by using room temperature measuring means to provide a measure of the temperature in the room where the processing means is adapted to calculate the average room temperature over a said cycle and to compare this with the desired temperature set by said user settable control to determine the desired total energising period for the next cycle. To determine the desired total energising period the maximum and minimum temperature measurements over a said cycle can also be used.Also, the power supply control apparatus preferably includes outside temperature measuring means to provide a measure of ambient temperature outside said room, where the processing means is adapted to calculate the average outside ambient temperature over a said cycle, and to use said calculated average outside ambient temperature and the minimum temperature measured over a said cycle to modify the desired total energising period for the next cycle.
Alternatively, in another embodiment of the present invention the processing means is adapted to use the outside ambient temperature measured at a predetermined time in said cycle to modify the desired total energising period for the next cycle.
Thus it is preferable that the processing means is adapted to calculate the desired total energising period by determining the amount of power required by the electrical appliance and the amount of power available from the power supply during a previous cycle.
Thus the present invention is able to learn the pattern of available off-peak electricity and provide the required amount of power to the electrical appliance.
The present invention also provides a method of controlling the supply of power from a power supply to an electrical appliance where said power supply provides a supply of power only periodically with periods having a cyclical pattern, said method comprising the steps of monitoring the supply of power; storing a pattern of data indicative of the time power is available from said power supply during a cycle, and supplying power to said electrical apliance for a desired total energisation period during the time power is available from said power supply in each successive similar cycle.
Examples of the present invention will now be desecribed with reference to the accompanying drawings, in which:- Figure 1 is a block diagram of the basic hardware configuration of the power supply control apparatus according to one embodiment of the present invention;
Figure 2 illustrates the various charging regimes that can be preselected for the supply of power to a storage heater;
Referring now to Figure 1, this embodiment of the present invention comprises a processing unit 1 which can monitor the off-peak supply. The processing unit 1 is provided with a clock or timer 2 in order for it to have a measure of time to enable the cyclical pattern of power available from the off-peak supply to be monitored. The processing unit 1 is connected to a switch means in the form of an output drive unit 3.The output drive unit 3 controls the supply of power to the electrical appliance which in this embodiment comprises the storage medium of a storage heater.
The power supply control apparatus is also provided with a power supply 4 for energising the circuitry. This power supply 4 can either be derived from the permanent mains supply or if no permanent mains supply is available, then it can be derived from the off-peak supply together with a back-up battery for when the off-peak supply is not available. Such a back-up battery can be rechargeable from the off-peak supply.
Room sensors 5 and outside sensors 6 are provided to measure the temperatures in a room and outside the room respectively. Such sensors can be thermistors or similar probes and the analogue signals produced therefrom together with the analogue signal from a user settable control 7 are input to a multichannel analogue to digital converter 8.
The digital signals representing the values of the signals from the room and outside sensors 5 and 6 and the user settable control 7 are input into the processing unit 1.
The user settable control 7 can be a potentiometer or any variable resistor for example.
The clock or timer 2 can be an external timing reference or an internal timer within the processing unit 1. The clock or timer 2 is an accurate reference to enable the processing unit 1 to time events on a twenty four hour cycle.
The operation of the power supply apparatus will now be described. When the power supply control apparatus is first energised or after restoration of power following power failure, the off-peak period will be assumed to be seven hours continuous and a twenty four hour timer will be initiated in the processor which will keep accurate time through each following twenty four hour cycle. During the twenty four hour cycle the off-peak supply will be monitored and as the off-peak supply switches on and off the pattern of switching will be memorised by the processing unit 1. During this first twenty four hour cycle, the power to the storage medium can be connected whenever the off-peak supply is on. This however could result in significant over charging of the storage medium for only a small change in the pattern or total duration of the off-peak supply.
An alternative method utilises the fact thatutilities can provide off-peak electricity in half hour slots. Switching of such off-peak electricity only occurs at the end or beginning of these slots. An off-peak period will be formed of several of these slots either consecutively or in a pattern.
As discussed hereinafter a percentage charge required by the storage medium is calculated and thus during the first twenty four hour cycle the power to the storage medium can be provided as the percentage charge required over each half hour time slot. Thus for each half hour of off-peak electricity in the first twenty four hour cycle not all the power is utilised. During each half hour time slot the power can be applied in a pattern. Forward, back or centre, distributed charging can be used during this period, or most desirably a random combination of any of these (as discussed hereinafter).
This latter option has the advantage for the utility that when the pattern or duration of the off-peak supply is changed and a number of locations are fitted with the power supply controller a large power demand at the start of the off-peak period will not result. Further, with this method there is less likelihood of significantly over charging the storage medium.
For both methods during subsequent twenty four hour periods the off pattern will be compared with the stored pattern. If the pattern differs greatly from the stored pattern the power supply control apparatus can either revert to full ON during the off-peak period or as described hereinabove a percentage charge can be taken during each half hour time slot. The new pattern will then be stored. If the pattern is the same as the previous twenty four hours the charge time will be controlled as a percentage of the off-peak period by controlling the total duration that power is supplied to the storage medium during the time the off-peak supply is on. This total duration can be supplied either as a single time period or as a number of smaller time periods. It is the total duration of the time periods that constitutes the total power applied to the storage medium during the off-peak period.
There are three different possible methods of storing the pattern of off-peak supply in the memory of the processing unit 1.
1) The time from the clock or timer 2 at which the off-peak power supply is switched on and the time at which the off-peak power supply is switched off is stored during a cycle. If the off-peak supply is provided in a number of short periods, then a number of on and off times will be stored.
2) The time from the clock or timer at which the off-peak power supply is switched on is stored in the memory of the processing unit 1 and the duration associated with that switch on time, for which the power is kept on is also stored. In this way a number of switch on and duration times are stored for a cycle to build-up the pattern of off-peak supply available during a cycle.
3) The pattern of data is stored in the form of successive data bits where each data bit represents the availability of power over an interval of time. This can be achieved using for instance a shift register where each bit in the shift register represents a period of time and the availability of power from the off-peak supply is measured at regular intervals with each data bit being input into the shift register successively to build up the pattern of data. For instance, the status of the off-peak supply can be measured at the beginning of a quarter of an hour time slot represented by one bit in the shift register and the status of the off-peak supply is measured every following quarter of an hour to form the successive data bits. This method greatly reduces the amount of data but reduces accuracy with which the pattern of off-peak supply is memorised.Accuracy can be increased by increasing the number of data bits (or length of the shift register).
The amount of power provided to the storage medium depends on the power requirements to meet the comfort level required within the room. During a twenty four hour cycle the room temperature is measured regularly and at the end of each twenty four hour cycle the average room temperature is calculated and stored. The maximum and minimum temperatures during the previous twenty four hour cycle are also stored. Using the required setting on the user settable control 7 and these measured temperatures, a percentage charge value is calculated in order to determine the total duration of the supply of power to the storage medium from the off-peak supply. During subsequent off-peak periods in subsequent cycles, the calculated percentage charge will be taken from the off-peak supply by connecting the storage medium to the off-peak supply for at least one predetermined period of time.The application of electrical power from the off-peak supply to the storage medium can thus be accomplished in many ways as shown in
Figure 2. Back, forward or centre charging can be used as shown in Figures 2a, 2b and 2c respectively. Also, distributed charging can be used wherein the total period of time is divided into a number of shorter periods of time regularly distributed through the off-peak supply period as shown in Figure 2b. There is a fifth alternative wherein the charging of the storage medium is achieved by a random selection from any of the above. This spreading of the power demand over the off-peak period greatly reduces the possibility of a peak in demand which can be of serious concern to the electricity utilities. The pattern of charging can be preselected.
During subsequent twenty four hour cycles the ability of the control apparatus to achieve the comfort level set by the user operable control 7 will be monitored and the calculated percentage will be adjusted by small steps, up or down, until the desired comfort level is attained.
The outside ambient temperature is measured by the outside sensors 6 and the average outside ambient temperature over a twenty four hour cycle is calculated.
This is used together with the minimum outside ambient temperature during the twenty four hour cycle to modify the calculated percentage charge for the following cycle in order to anticipate any change in the weather.
Alternatively, the outside ambient temperature at a predetermined time such as approximately 2.00 a.m. can be used to define the proportion of charge required. It has been proven that the temperature in the early hours of the morning is consistently indicative of the prevailing weather conditions.
Thus this embodiment of the present invention provides for the supply of power to a storage heater wherein the power demand from the off-peak supply can be distributed throughout the off-peak supply period by selection by a user of the appropriate charging regime.
Further, the power supply control apparatus is able to monitor and adapt to changes in the times of availability of the off-peak supply. Still further, the power supply control apparatus is able to adjust the amount of power provided to the storage medium by comparing the actual temperature with the desired temperature, taking into consideration the outside ambient temperatures, in order to modify the amount of power drawn from the off-peak supply during the next cycle.
Although the embodiment described hereinabove has been described with reference to off-peak mains electricity
supply, the present invention is not limited thereto. The
present invention is applicable to the control of power to
any electrical appliance from a power supply which provides
power only periodically in a cyclical pattern.
Claims (36)
1. A power supply control apparatus for controlling the supply of power from a power supply to an electrical appliance, where said power supply provides a supply of power only periodically with periods having a cyclical pattern, said apparatus comprising memory means; processing means adapted to monitor the supply of power and store in said memory means a pattern of data indicative of the time power is available from said power supply during a cycle; and switch means operable to switch the power available from said power supply to said electrical appliance; wherein said processing means is adapted to control said switch means to supply power to said electrical appliance for a desired total energising period during the time power is available from said power supply in each successive similar cycle.
2. Power supply control apparatus as claimed in Claim 1 including clock means to provide a measure of time during a cycle, said processing means being adapted to use said measure of time to form said data.
3. Power supply control apparatus as claimed in Claim 2, wherein said clock means is adapted to provide a measure of time over a twenty four hour period.
4. Power supply control apparatus as claimed in Claim 2 or Claim 3, wherein said processing means is adapted to store in said memory means the or each time at which the supply of power becomes available and the or each time at which the supply of power becomes no longer available during a cycle.
5. Power supply control apparatus as claimed in Claim 2 or Claim 3, wherein said processing means is adapted to store in said memory means the or each time in a cycle at which the supply of power becomes available from the power supply and the associated duration of time for which power is available following the or each said time.
6. Power supply control apparatus as claimed in Claim 2 or Claim 3, wherein said processing means is adapted to store said data in the form of successive data bits, each data bit representing availability of power over an interval of time.
7. Power supply control apparatus as claimed in Claim 6, wherein said processing means is adapted to measure the availiability of power at regular said intervals in time to form said successive data bits.
8. Power supply control apparatus as claimed in any preceding claim wherein said processing means, when energised, is adapted to monitor the supply of power for the first cycle and store in said memory means data indicative of the time power is available from said power supply during said cycle, and to control said switch means to supply power to said electrical appliance for the whole time power is available from said power supply during said cycle.
9. Power supply control apparatus as claimed in any one of Claims 1 to 7, wherein the times at which the supply of power becomes available and no longer available are at times which are an integer number of predetermined periods of time; said processing means, when energised, being adapted to monitor the supply of power for the first cycle and store in said memory means data indicative of the time power is available from said power supply during said cycle, and to control said switch means to supply power to said electrical appliance during a number of discrete periods during each said predetermined period of time when power is available from said power supply during said cycle, the number, pattern and duration of said discrete periods being predetermined.
10. Power supply control apparatus as claimed in any one of Claims 1 to 8, wherein said processing means is adapted to compare the cyclical pattern of power being supplied by said power supply with the pattern of data stored in said memory, and if it is determined that the patterns are not the same, said processing means is adapted to control said switch means to supply power to said electrical appliance during the whole time power is available from said power supply during said cycle and to store in said memory means data indicative of the time power is available from said power supply during said cycle.
11. Power supply control apparatus as claimed in any one of Claims 1 to 7 or 9, wherein the times at which the supply of power becomes available and no longer available are at times which are an integer number of predetermined periods of time; said processing means being adapted to compare the cyclical pattern of power being supplied by said power supply with the pattern of data stored in said memoryr and if it is determined that the patterns are not the same, said processing means is adapted to control said switch means to supply power to said electrical appliance during a number of discrete periods during each said predetermined period of time when power is available from said power supply during said cycle, the number, pattern and duration of said discrete periods being predetermined, and to store in said memory means data indicative of the time power is available from said power supply during said cycle.
12. Power supply control apparatus as claimed in any preceding claim wherein said processing means is adapted to monitor the power requirement of said electrical appliance to calculate the desired total energisation period in each successive similar cycle.
13. A power supply control apparatus as claimed in any preceding claim wherein said processing means is adapted to control said switch means to supply power to said electrical appliance during at least one energising period having a total period of time equal to said desired total energising period, and said processing means includes preselection means adapted to preselect the number of energising periods and the relative positions within the cyclical pattern that said switch means is controlled to supply power to said electrical appliance.
14. Power supply control apparatus as claimed in any preceding claim wherein said electrical appliance comprises a storage heater with a user settable control to set the desired temperature of a room; said apparatus including room temperature measuring means to provide a measure of the temperature in said room; said processing means being adapted to calculate the average room temperature over a said cycle, and to compare this with the desired temperature set by said user settable control to determine the desired total energisation period for the next cycle.
15. Power supply control apparatus as claimed in Claim 14, wherein said processing means is adapted to use maximum and minimum temperature measurements over a said cycle from said room temperature measuring means to determine the desired total energisation period for the next cycle.
16. Power supply control apparatus as claimed in Claim 14 or Claim 15, including outside temperature measuring means to provide a measure of ambient temperature over a said cycle, and to use said calculated average outside ambient temperature and the minimum temperature measured over a said cycle to modify the desired total energisation period for the next cycle.
17. Power supply control apparatus as claimed in Claim 14 or Claim 15, including outside temperature measuring means to provide a measure of ambient temperature outside said room; said processing means being adapted to use the outside ambient temperature measured at a predetermined time in said cycle to modify the desired total energisation period for the next cycle.
18. Power supply control apparatus as claimed in any preceding claim wherein the processing means is adapted to calculate the desired total energisation period by determining the amount of power required by said electrical appliance and the amount of power available from the power supply during a previous cycle.
19. A method of controlling the supply of power from a power supply to an electrical appliance, where said power supply provides a supply of power only periodically with periods having a cyclical pattern, said method comprising the steps of monitoring the supply of power; storing a pattern of data indicative of the time power is available from said power supply during a cycle, and supplying power to said electrical appliance for a desired total energisation period during the time power is available fromsaid power supply in each successive similar cycle.
20. A method as claimed in Claim 19, wherein said method is performed by electronic control apparatus energised by a supply of power, said method including the steps following energisation, of storing data indicative of the time power is available from said power supply for the first cycle following energisation, and supplying power to said electrical appliance for the whole time power is available from said power supply during said cycle.
21. A method as claimed in Claim 19, wherein the times at which the supply of power becomes available and no longer available are at times which are an integer number of predetermined periods of time, and said method is performed by electronic control apparatus energised by a supply of power; said method including the steps following energisation, of storing data indicative of the time power is available from said power supply for the first cycle following energisation, and supplying power to said electrical appliance during a number of discrete periods during each said predetermined period of time when power is available from said power supply during said cycle, the number, pattern and duration of said discrete periods being predetermined.
22. A method as claimed in Claim 19 or Claim 20, wherein said method includes the steps of comparing the cyclical pattern of power supplied by said power supply with the pattern of stored data, if it is determined that the patterns are not the same, power is supplied to said electrical appliance during the whole time power is available from said power supply during said cycle, and a pattern of data indicative of the time power is available from said power supply during said cycle is stored.
23. A method as claimed in Claims 19 or 20, wherein the times at which the supply of power becomes available and no longer available at times which are an integer number of predetermined periods of time; the method including the steps of comparing the cyclical pattern of power supplied by said power supply with the pattern of stored data, if it is determined that the patterns are not the same, power is supplied to said electrical appliance during a number of discrete periods during each predetermined period of time when power is available from said power supply during said cycle, the number, pattern and duration of said discrete periods being predetermined, and a pattern of data indicative of the time power is available from said power supply during said cycle is stored.
24. A method as claimed in any one of Claims 19 to 23, wherein the or each time at which the supply of power becomes available and the or each time at which the supply of power becomes no longer available from the power supply during a cycle are stored.
25. A method as claimed in any one of Claims 19 to 23, wherein the or each time at which the supply of power becomes available from the power supply and the associated duration of time for which power is available following the or each said time in a cycle are stored.
26. A method as claimed in any one of Claims 19 to 23, wherein said data is stored in the form of successive data bits; each data bit representing availability of power over an interval of time.
27. A method as claimed in Claim 26, wherein the availability of power is measured at regular said intervals in time to form said successive data bits.
28. A method as claimed in any one of Claims 19 to 27, wherein the power requirement of said electrical appliance is monitored, and the desired total energisation period is calculated therefrom.
29. A method as claimed in any one of Claims 19 to 28, wherein power is supplied to said electrical appliance during at least one energising period having a total period of time equal to said desired total energising period, and the number of energising periods and relative positions within the cyclical pattern is preselectable.
30. A method as claimed in any of Claims 19 to 29, wherein said electrical appliance comprises a storage heater with a user settable control to set the desired temperature in a room, said method including the steps of measuring the temperature in said room, calculating the average room temperature over a said cycle, and comparing this with the desired temperature set by said user settable control to determine the desired total energisation period for the next cycle.
31. A method as claimed in Claim 30, wherein the maximum and minimum temperature over a said cycle is used to determine the desired total energisation period for the next cycle.
32. A method as claimed in Claim 30 or Claim 31, including the steps of measuring the ambient temperature outside said room, calculating the average outside ambient temperature over a said cycle, and using said average outside ambient temperature together with the minimum outside ambient temperature measured over said cycle to modify the desired total energisation period for the next cycle.
33. A method as claimed in Claim 30 or Claim 31, including the steps of measuring the ambient temperature outside said room, and using the outside ambient temperature at a predetermined time in said cycle to modify the desired total energisation period for the next cycle.
34. A method as claimed in any one of Claims 19 to 33, wherein the desired total energisation period is calculated by determining the amount of power required by said electrical appliance and the amount of power available from the power supply during a previous cycle.
35. A method substantially as hereinbefore described with reference to the drawings.
36. Power supply control apparatus substantially as hereinbefore described with reference to and as illustrated in Figure 1 of the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9225552A GB2274179B (en) | 1992-12-07 | 1992-12-07 | Power supply controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9225552A GB2274179B (en) | 1992-12-07 | 1992-12-07 | Power supply controller |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9225552D0 GB9225552D0 (en) | 1993-01-27 |
| GB2274179A true GB2274179A (en) | 1994-07-13 |
| GB2274179B GB2274179B (en) | 1996-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9225552A Expired - Fee Related GB2274179B (en) | 1992-12-07 | 1992-12-07 | Power supply controller |
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| Country | Link |
|---|---|
| GB (1) | GB2274179B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863252B (en) * | 2009-04-14 | 2011-12-28 | 北京长征天民高科技有限公司 | Vehicle emergency controller, control method and vehicle |
| CN103064325A (en) * | 2012-12-14 | 2013-04-24 | 浙江明烁电子科技有限公司 | Multipath output control circuit |
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| FR2482403A1 (en) * | 1980-05-12 | 1981-11-13 | Redoute Pierre | Storage heater regulator maximising cheap rate electricity - times switching period to coincide with cheap rate period by integrating time at beginning of cheap cycle |
| JPH04109995A (en) * | 1990-08-31 | 1992-04-10 | Sanyo Electric Co Ltd | Full automatic washing machine |
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1992
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|---|---|---|---|---|
| FR2465389A1 (en) * | 1979-09-14 | 1981-03-20 | Radiotechnique Compelec | Delayed switch-on off=peak storage heaters - adjusts input to D=A converter to produce ramp input to circuit for comparison with heater temp. to delay turn-on |
| FR2482403A1 (en) * | 1980-05-12 | 1981-11-13 | Redoute Pierre | Storage heater regulator maximising cheap rate electricity - times switching period to coincide with cheap rate period by integrating time at beginning of cheap cycle |
| JPH04109995A (en) * | 1990-08-31 | 1992-04-10 | Sanyo Electric Co Ltd | Full automatic washing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863252B (en) * | 2009-04-14 | 2011-12-28 | 北京长征天民高科技有限公司 | Vehicle emergency controller, control method and vehicle |
| CN103064325A (en) * | 2012-12-14 | 2013-04-24 | 浙江明烁电子科技有限公司 | Multipath output control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9225552D0 (en) | 1993-01-27 |
| GB2274179B (en) | 1996-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19981207 |