1. A system for driving a plurality of cold-cathode fluorescent lamps, the system comprising:
a subsystem configured to receive at least a DC voltage and generate a first AC voltage in response to at least the DC voltage;
a power converter configured to receive the first AC voltage and convert the first AC voltage to at least a second AC voltage; and
a plurality of current balancing devices;
wherein the power converter and the plurality of current balancing devices are configured to be directly or indirectly coupled to a plurality of cold-cathode fluorescent lamps including N fluorescent lamps;
wherein:
the plurality of cold-cathode fluorescent lamps includes a 1st fluorescent lamp, a 2nd fluorescent lamp, . . . , a (j\u22121)th fluorescent lamp, a jth fluorescent lamp, a (j+1)th fluorescent lamp, . . . , an (n\u22121)th fluorescent lamp, and an nth fluorescent lamp;
the 1st fluorescent lamp, the 2nd fluorescent lamp, . . . , the (j\u22121)th fluorescent lamp, the jth fluorescent lamp, the (j+1)th fluorescent lamp, . . . , the (n\u22121)th fluorescent lamp, and the nth fluorescent lamp are associated with a 1st lamp current, a 2nd lamp current, . . . , a (j\u22121)th lamp current, a jth lamp current, a (j+1)th lamp current, . . . , an (n\u22121)th lamp current, and an nth lamp current, respectively;
n\u22673; and
1<j<n;
wherein:
each of the plurality of current balancing devices is configured to receive two currents and balance the two currents;
the plurality of current balancing devices are further configured to balance the 1st lamp current and the 2nd lamp current, . . . , the (j\u22121)th lamp current and the jth lamp current, the jth lamp current and the (j+1)th lamp current, . . . , the (n\u22121)th lamp current and the nth lamp current, and the nth lamp current and the 1st lamp current, different pairs of currents being balanced by different current balancing devices;
wherein:
each of the plurality of current balancing devices includes a first winding and a second winding;
the first winding is in series with one of the plurality of cold-cathode fluorescent lamps; and
the second winding is in series with another one of the plurality of cold-cathode fluorescent lamps.
2. The system of claim 1 wherein the 1st lamp current, the 2nd lamp current, . . . , the (j\u22121)th lamp current, the jth lamp current, the (j+1)th lamp current, . . . , the (n\u22121)th lamp current, and the nth lamp current are input currents flowing into the 1st fluorescent lamp, the 2nd fluorescent lamp, . . . , the (j\u22121)th fluorescent lamp, the jth fluorescent lamp, the (j+1)th fluorescent lamp, . . . , the (n\u22121)th fluorescent lamp, and the nth fluorescent lamp, respectively.
3. The system of claim 1 wherein the 1st lamp current, the 2nd lamp current, . . . , the (j\u22121)th lamp current, the jth lamp current, the (j+1)th lamp current, . . . , the (n\u22121)th lamp current, and the nth lamp current are output currents flowing out of the 1\u2032 fluorescent lamp, the 2nd fluorescent lamp, the (j\u22121)th fluorescent lamp, the jth fluorescent lamp, the (j+1)th fluorescent lamp, . . . , the (n\u22121)th fluorescent lamp, and the nth fluorescent lamp, respectively.
4. The system of claim 1 wherein the power converter is further configured to drive the plurality of cold-cathode fluorescent lamps with at least the second AC voltage.
5. The system of claim 1 wherein the power converter is further configured to convert the first AC voltage to at least the second AC voltage and a third AC voltage.
6. The system of claim 5 wherein the power converter is further configured to drive the plurality of cold-cathode fluorescent lamps with at least the second AC voltage and the third AC voltage.
7. The system of claim 5 wherein the power converter includes at least a first transformer and a second transformer, the first transformer being configured to output the second AC voltage, the second transformer being configured to output the third AC voltage.
8. The system of claim 1 wherein the each of the plurality of current balancing devices is a current balance choke.
9. The system of claim 1, and further comprising a plurality of capacitors coupled to the power converter.
10. The system of claim 9 wherein the power converter is capable of being indirectly coupled to the plurality of cold-cathode fluorescent lamps through at least the plurality of capacitors.
11. The system of claim 1, and further comprising a current sensing feedback component coupled to the subsystem and configured to be coupled to at least one of the plurality of cold-cathode fluorescent lamps.
12. The system of claim 1 wherein the plurality of cold-cathode fluorescent lamps consists of an even number of cold-cathode fluorescent lamps.
13. The system of claim 1 wherein the plurality of cold-cathode fluorescent lamps consists of an odd number of cold-cathode fluorescent lamps.
14. A method for driving a plurality of cold-cathode fluorescent lamps, the method comprising:
receiving at least a DC voltage;
generating a first AC voltage in response to at least the DC voltage;
receiving the first AC voltage;
converting the first AC voltage to at least a second AC voltage;
driving a plurality of cold-cathode fluorescent lamps with at least the second AC voltage, the plurality of cold-cathode fluorescent lamps being associated with a plurality of lamp currents respectively;
balancing the plurality of lamp currents by a plurality of current balancing devices, each of the plurality of current balancing devices being configured to receive two currents and balance the two currents;
wherein:
the plurality of cold-cathode fluorescent lamps includes N fluorescent lamps;
the plurality of cold-cathode fluorescent lamps includes a 1st fluorescent lamp, a 2nd fluorescent lamp, . . . , a (j\u22121)th fluorescent lamp, a jth fluorescent lamp, a (j+1)th fluorescent lamp, . . . , an (n\u22121)th fluorescent lamp, and an nth fluorescent lamp;
the 1st fluorescent lamp, the 2nd fluorescent lamp, . . . , the (j\u22121)th fluorescent lamp, the jth fluorescent lamp, the (j+1)th fluorescent lamp, . . . , the (n\u22121)th fluorescent lamp, and the nth fluorescent lamp are associated with a 1st lamp current, a 2nd lamp current, . . . , a (j\u22121)th lamp current, a jth lamp current, a (j+1)th lamp current, . . . , an (n\u22121)th lamp current, and an nth lamp current, respectively;
n\u22673; and
1<j<n;
wherein the process for balancing the plurality of lamp currents by the plurality of current balancing devices includes balancing the 1st lamp current and the 2nd lamp current, . . . , the (j\u22121)th lamp current and the jth lamp current, the jth lamp current and the (j+1)th lamp current, . . . , the (n\u22121)th lamp current and the nth lamp current, and the nth lamp current and the 1st lamp current, different pairs of currents being balanced by different current balancing devices;
wherein:
each of the plurality of current balancing devices includes a first winding and a second winding; and
the process for balancing the plurality of lamp currents by the plurality of current balancing devices includes balancing one of the plurality of lamp currents by at least the first winding and another one of the plurality of lamp currents by at least the second winding.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A semiconductor memory device, comprising:
a cell array internal voltage generating circuit for generating cell array reference voltage and a cell array power voltage from a first external power voltage;
a peripheral circuit internal voltage generating circuit for generating a peripheral circuit reference voltage and a peripheral circuit power voltage from the first external power voltage; and
a voltage boosting circuit power voltage generating circuit for generating a voltage boosting circuit reference voltage and a voltage boosting circuit power voltage from a second external power voltage.
2. The device of claim 1, wherein the second external power voltage is higher in voltage level than the first external power voltage.
3. The device of claim 1, wherein the voltage boosting circuit power voltage generating circuit comprises:
a voltage boosting circuit reference voltage generating circuit for receiving the second external power voltage to generate the voltage boosting circuit reference voltage having a prescribed level; and
a voltage boosting circuit internal voltage driving circuit for generating the voltage boosting power voltage from the second external power voltage in response to the voltage boosting circuit reference voltage.
4. The device of claim 1, further comprising, a voltage boosting circuit for generating a boosted voltage using the voltage boosting circuit reference voltage and the voltage boosting circuit power voltage.
5. The device of claim 1, wherein the cell array internal voltage generating circuit comprises:
a cell array reference voltage generating circuit for receiving the first external power voltage to generate the cell array reference voltage having a prescribed level; and
a cell array internal voltage driving circuit for generating the cell array internal voltage from the first external power voltage according to the cell array reference voltage.
6. The device of claim 5, further comprising, a voltage boosting circuit for generating a boosted voltage using the cell array reference voltage and the voltage boosting circuit power voltage.
7. The device of claim 1, wherein the peripheral circuit internal voltage generating circuit comprises:
a peripheral circuit reference voltage generating circuit for receiving the first external power voltage to generate the peripheral circuit reference voltage having a prescribed level; and
a peripheral circuit internal voltage driving circuit for generating the peripheral circuit internal voltage from the first external power voltage according to the peripheral circuit reference voltage.
8. The device of claim 5, further comprising, a voltage boosting circuit for generating a boosted voltage using the peripheral circuit reference voltage and the voltage boosting circuit power voltage.
9. A semiconductor memory device, comprising:
a cell array internal voltage generating circuit for generating cell array reference voltage and a cell array power voltage from a first external power voltage;
a peripheral circuit internal voltage generating circuit for generating a peripheral circuit reference voltage and a peripheral circuit power voltage from the first external power voltage; and
a voltage boosting circuit power voltage generating circuit for generating a voltage boosting circuit reference voltage from a second external power voltage and outputting the second external power voltage as a voltage boosting circuit power voltage.
10. The device of claim 9, wherein the second external power voltage is higher in voltage level than the first external power voltage.
11. The device of claim 9, further comprising, a voltage boosting circuit for generating a boosted voltage using the voltage boosting circuit reference voltage and the voltage boosting circuit power voltage.
12. The device of claim 9, wherein the cell array internal voltage generating circuit comprises:
a cell array reference voltage generating circuit for receiving the first external power voltage to generate the cell array reference voltage having a prescribed level; and
a cell array internal voltage driving circuit for generating the cell array internal voltage from the first external power voltage according to the cell array reference voltage.
13. The device of claim 12, further comprising, a voltage boosting circuit for generating a boosted voltage using the cell array reference voltage and the voltage boosting circuit power voltage.
14. The device of claim 9, wherein the peripheral circuit internal voltage generating circuit comprises:
a peripheral circuit reference voltage generating circuit for receiving the first external power voltage to generate the peripheral circuit reference voltage having a prescribed level; and
a peripheral circuit internal voltage driving circuit for generating the peripheral circuit internal voltage from the first external power voltage according to the peripheral circuit reference voltage.
15. The device of claim 14, further comprising, a voltage boosting circuit for generating a boosted voltage using the peripheral circuit reference voltage and the voltage boosting circuit power voltage.
16. A semiconductor memory device, comprising:
a cell array internal voltage generating circuit for generating cell array reference voltage and a cell array power voltage from a first external power voltage;
a peripheral circuit internal voltage generating circuit for generating a peripheral circuit reference voltage and a peripheral circuit power voltage from the first external power voltage; and
a voltage boosting circuit for generating a boosted voltage using one of the cell array reference voltage and the peripheral circuit reference voltage, and a second external power voltage.
17. The device of claim 16, wherein the second external power voltage is higher in voltage level than the first external power voltage.