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Switching method and apparatus

Патентный поиск по классам МПК-8:

Класс H01H47/00 Схемы, предназначенные не для какого-либо конкретного использования реле, а предназначенное для получения требуемых рабочих характеристик или для получения тока возбуждения

Класс H01H35/00 Переключатели, приводимые в действие в результате изменения физических параметров

Класс H01H83/18 срабатывающие при отклонении от нормальных значений произведения напряжения и тока или угла сдвига фаз между напряжением и током, например реле, обладающие направленным действием 

Патенты РФ в классе H01H83/18:
реле направления мощности -  патент 2205466
реле направления мощности -  патент 2061287

Класс H02H3/02 элементы конструкций 

Класс H02H3/42 реагирующие на произведение напряжения и тока 


Классы МПК:H01H47/00 Схемы, предназначенные не для какого-либо конкретного использования реле, а предназначенное для получения требуемых рабочих характеристик или для получения тока возбуждения
H01H35/00 Переключатели, приводимые в действие в результате изменения физических параметров
H01H83/18 срабатывающие при отклонении от нормальных значений произведения напряжения и тока или угла сдвига фаз между напряжением и током, например реле, обладающие направленным действием 
H02H3/02 элементы конструкций 
H02H3/42 реагирующие на произведение напряжения и тока 
Автор(ы): Saligram, Narayana Prakash (Bangalore, IN)
Nair, Sreejakumar Sreekantan (Karnataka, IN)
Thalli, Pradeep (Karnataka, IN)
Патентообладатель(и): American Power Conversion Corporation (West Kingston, RI, US)
Приоритеты:
подача заявки
30.12.2009
публикация патента
03.04.2012

РЕФЕРАТ (Abstract)

A switch circuit and method for converting a hard switch into a soft switch. In one example, the circuit includes a first switch having a first node and a second node, and a switch control circuit coupled in parallel with the first switch between the first and second nodes. The switch control circuit includes a series resonant circuit including a capacitor and an inductor coupled together in series, a second switch coupled in parallel with the series resonant circuit, a third switch coupled in series between the first node and the series resonant circuit, and a first diode coupled between the series resonant circuit and the second node, an negative terminal of the first diode being coupled to the second node.
Полный текст Патента US 8148853 + PDF


ФОРМУЛА ИЗОБРЕТЕНИЯ (CLAIMS)

What is claimed is:

1. A switch circuit comprising: a first switch having a first node and a second node; and a switch control circuit coupled in parallel with the first switch between the first and second nodes, the switch control circuit comprising: a series resonant circuit including a capacitor and an inductor coupled together in series; a second switch coupled in parallel with the series resonant circuit; a third switch coupled in series between the first node and the series resonant circuit; and a first diode coupled between the series resonant circuit and the second node, a negative terminal of the first diode being coupled to the second node.

2. The switch circuit as claimed in claim 1, further comprising a second diode coupled between the second switch and a junction point of the series resonant circuit and the first diode.

3. The switch circuit as claimed in claim 1, further comprising a controller coupled to each of the first, second and third switches and configured to provide control signals to turn the first, second and third switches on and off.

4. The switch circuit as claimed in claim 3, wherein prior to turn on or turn off of the first switch, the controller is configured to control the third switch to reverse a polarity of a voltage across the capacitor.

5. The switch circuit as claimed in claim 4, wherein the controller is further configured to turn on the second switch, after the polarity of the voltage across the capacitor has been reversed, to discharge the capacitor.

6. The switch circuit as claimed in claim 5, wherein the controller is further configured to turn the first switch on or off at approximately at zero-crossing point of the voltage across the capacitor.

7. The switch circuit as claimed in claim 1, wherein the switching circuit is included in a power converter, wherein the first switch is repeatedly switched on and off.

8. A method of operating a control circuit to actuate a switch, the control circuit comprising a series resonant circuit including a capacitor and an inductor, a first auxiliary switch coupled between a first node of the switch and an input of the series resonant circuit, a diode coupled between an output of the series resonant circuit and a second node of the switch, and a second auxiliary switch coupled in parallel with the series resonant circuit, the method comprising: turning on the second auxiliary switch; turning off the second auxiliary switch after a polarity of a voltage across the capacitor has been reversed; turning on the first auxiliary switch to discharge the capacitor; and actuating the switch at approximately a zero-crossing point of the voltage across the capacitor.

9. The method as claimed in claim 8, further comprising: turning off the first auxiliary switch after turning on the switch.

10. The method as claimed in claim 8, wherein a time period between turning on the second auxiliary switch and turning off the second auxiliary switch is at least π√{square root over (LC)}; wherein L is a value of an inductance of the inductor of the series resonant circuit and C is a value of a capacitance of the capacitor of the series resonant circuit.

11. The method as claimed in claim 8, further comprising: repeatedly turning the switch on and off; and continually charging and discharging the capacitor included in the series resonator circuit.

12. A method of operating a switch comprising: reducing a voltage across the switch to approximately zero by generating a first resonant current responsive to an instruction to turn on the switch; closing the switch when the voltage across the switch is approximately zero, wherein the voltage across the switch reduces to approximately zero prior to closing the switch; reducing a current through the switch to approximately zero by generating a second resonant current responsive to an instruction to turn off the switch; and opening the switch when the current is approximately zero, wherein the current across the switch reduces to approximately zero prior to opening the switch.

13. The method as claimed in claim 12, wherein generating the first resonant current includes generating the first resonant current in a resonant circuit coupled in parallel with the switch.

14. The method as claimed in claim 13, wherein the resonant circuit includes a capacitor and wherein reducing the voltage across the switch includes: reversing a polarity of a voltage across the capacitor; and actuating the switch at approximately a zero-crossing point of the voltage across the capacitor.

15. The method as claimed in claim 14, wherein the resonant circuit further includes an inductor and wherein reducing the voltage across the switch further includes increasing a current through the inductor until a current peak is reached at approximately the zero-crossing point.

16. The method as claimed in claim 15, further comprising determining a time period the switch is actuated as a function of a resonant time period of the resonant circuit formed by the capacitor and the inductor.

17. The method as claimed in claim 12, wherein generating the second resonant current includes generating the second resonant current in a resonant circuit coupled in parallel with the switch.

18. The method as claimed in claim 17, wherein the resonant circuit includes a capacitor and wherein reducing the current through the switch includes: reversing a polarity of a voltage across a capacitor; and actuating the switch at approximately a zero-crossing point of the voltage across the capacitor.

19. The method as claimed in claim 18, wherein the resonant circuit includes an inductor and wherein reducing the current across the switch further includes increasing a current through the inductor until a current peak is reached at approximately the zero-crossing point.

20. The method as claimed in claim 12, further comprising reducing a power loss associated with the switch during a time period the switch is actuated.


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