Method of controlling power transmission to a load
地域：
Laval
摘要
The method of controlling power transmission to a load permits: to eliminate over-voltage in an electric circuit; to decrease energy losses and time of charging of an energy storing device; to increase service life of switches and provide very high reliability of power transmission to a load. The conception is following: controlling power transmission to a load from additional circuit so that current can be transferred from additional circuit to operating circuit (circuit with a load) and vice versa from operating circuit to additional circuit without interruption (without switching off) circuit of the load.
說明書
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The present invention relates to the methods of controlling of power transmission to a load.
Known cycle control changes the quantity of energy transmitted to a load by changing ratio off on number of whole cycles of voltage are applied to the load.
U.S. Pat. No. 6,188,208 is an example of mentioned cycle control with a zero-crossing detector for detecting when a cycle of the AC line power crosses zero voltage in order to detect the beginning of each AC line cycle.
The steps of connecting and disconnecting a load to the AC line power, when voltage crosses zero, can be useful if current of a load follows the input voltage. In other words, when impedance of a load is resistance (when reactance is practically equal to zero). Other disadvantages, which are presented in U.S. Pat. No. 6,188,208, are reproduced below (without additions):
權(quán)利要求
What is claimed is:1. A method of controlling power transmission to a load comprising the steps of:choosing a voltage source of alternating current with desirable amplitude; choosing capacitors with capacitances permitting to obtain desirable values of said power transmission from said voltage source of alternating current to a said load; forming a capacitor device with said capacitors and with first and second output terminals; connecting said, second output terminal of said capacitor device in series with said load through at least an operating switching device in off state; connecting said in series circuit to said voltage source through said first output terminal of said capacitor device; connecting said capacitor device in parallel with said voltage source through said first and second output terminals and at least an additional switching device in on state or connecting said capacitor device in parallel with said voltage source through said first and second output terminals and a first and a second additional switching devices in on state; switching on said voltage source, then, after a delay time, switching on said operating switching device, then switching off said additional switching device or switching on said voltage source, then, after said delay time, switching on said operating switching device, then switching off said second additional switching device; controlling said power transmission to said load by switching on and switching off said additional switching device or controlling said power transmission to said load by switching on and switching off said second additional switching device. 2. The method of controlling said power transmission to a load as claimed in claim 1 further comprising the steps of varying a ratio of on-to-off time of said additional switching device or varying said ratio of on-to-off time of said second additional switching device. 3. The method of controlling said power transmission to a load as claimed in claim 1 further comprising the steps of switching on said additional switching device before switching off said operating switching device or switching on said second additional switching device before switching off said operating switching device. 4. The method of controlling said power transmission to a load as claimed in claim 1 in which each of said capacitors of said capacitor device is connected to said first and second output terminals through a switching device. 5. The method of controlling said power transmission to a load as claimed in claim 4 further comprising the steps of connecting at least one of said capacitors to said output terminals or disconnecting at least one of said capacitors from said output terminals. 6. The method of controlling said power transmission to a load as claimed in claim 1 in which said load is an inductive load. 7. The method of controlling said, power transmission to a load as claimed in claim 1 in which said voltage source includes step-up transformer. 8. The method of controlling said power transmission to a load as claimed in claim 1 in which said step of switching on of said additional switching device or said step of switching on of said second additional switching device is controlled by zero crossing voltage control device connected to said voltage source through a bridge rectifier. 9. A method of controlling power transmission to a load comprising the steps of:choosing a voltage source of alternating current with desirable amplitude; choosing capacitors with capacitances permitting to obtain desirable values of said power transmission from said voltage source of alternating current to said load; forming a capacitor device with said capacitors and with first and second output terminals; connecting said second output terminal of said capacitor device in series with said load through at least an operating switching device in off state and a bridge rectifier, or connecting said second output terminal of said capacitor device in series with said load through said bridge rectifier and said at least an operating switching device in off state; connecting said in series circuit to said voltage source through said first output terminal of said capacitors device; connecting said capacitor device in parallel with said voltage source through said first and second output terminals and at least an additional switching device in on state or connecting said capacitor device in parallel with said voltage source through said first and second output terminals and a first and a second additional switching devices in on state; switching on said voltage source, then, after a delay time, switching on said operating switching device, then switching off said additional switching device or switching on said voltage source, then, after said delay time, switching on said operating switching device, then switching off said second additional switching device; controlling said power transmission to said load by switching on and switching off said additional switching device or controlling said power transmission to said load by switching on and switching off said second additional switching device. 10. The method of controlling said power transmission to a load as claimed in claim 9 further comprising the steps of varying a ratio of on-to-off time of said additional switching device or varying said ratio of on-to-off time of said second additional switching device. 11. The method of controlling said power transmission to a load as claimed in claim 9 further comprising the steps of switching on said additional switching device before switching off said operating switching device or switching on said second additional switching device before switching off said operating switching device. 12. The method of controlling said power transmission to a load as claimed in claim 9 in which each of said capacitors of said capacitor device is connected to said first and second output terminals through a switching device. 13. The method of controlling said power transmission to a load as claimed in claim 12 further comprising the steps of connecting at least one of said capacitors to said output terminals or disconnecting at least one of said capacitors from said output terminals. 14. The method of controlling said power transmission to a load as claimed in claim 9 further comprising the steps of connecting terminals of said load through a smoothing capacitor. 15. The method of controlling said power transmission to a load as claimed in claim 9 further comprising the steps of measuring at least a parameter of said load or a parameter near to said load and using it for triggering switching on and switching off of said additional switching device or for triggering switching on and switching off of said second additional switching device. 16. The method of controlling said power transmission to a load as claimed in claim 9 in which said load is an energy storing device. 17. The method of controlling said power transmission to a load as claimed in claim 16 further comprising the steps of controlling voltage of said energy storing device and switching off said operating switching device when said energy storing device is charged to desirable level. 18. The method of controlling said power transmission to a load as claimed in claim 17 further comprising the steps of switching on said additional switching device before switching off said operating switching device or switching on said second additional switching device before switching off said operating switching device. 19. The method of controlling said power transmission to a load as claimed in claim 9 in which said load is formed by two or more parts or by two or more loads. 20. The method of controlling said power transmission to a load as claimed in claim 19 in which said loads are the parts of an energy storing device. 21. The method of controlling said power transmission to a load as claimed in claim 20 in which said energy storing device is formed by no less than two parts, having different number connected in parallel to an energy storing units, and having no less than one unidirectional conductive device connected in parallel with no less than one of said energy storing units of each of said parts and installed against current of charging of said energy storing units. 22. The method of controlling said power transmission to a load as claimed in claim 9 in which said voltage source includes a voltage transformer. 23. The method of controlling said power transmission to a load as claimed in claim 9 in which said voltage source includes step-up transformer. 24. The method of controlling said power transmission to a load as claimed in claim 9 in which said step of switching on of said additional switching device or said step of switching on of said second additional switching device is controlled by zero crossing voltage control device connected to said voltage source through said bridge rectifier. 25. The method of controlling said power transmission to a load as claimed in claim 9 in which said load is control circuits of a switching device.
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