1. A power output apparatus comprising:
first and second motor generators,
first and second inverters connected to said first and second motor generators, respectively, and receiving an input voltage from a voltage supply line, and
a control device controlling an operation of said first and second inverters such that AC voltage is generated across neutral points of said first and second motor generators using said input voltage,
wherein said control device controls said first and second inverters in coordination such that an intermediate value between a maximum value and a minimum value of voltage controls for said first and second motor generators is equivalent to an intermediate potential of said input voltage.
2. The power output apparatus according to claim 1, wherein said control device further controls an operation of said first inverter andor said second inverter such that at least one of said first and second motor generators is driven using said input voltage.
3. The power operation apparatus according to claim 1, wherein said control device includes a coordination control unit that controls said first and second inverters in coordination by calculating said intermediate value, and subtracting said calculated intermediate value from each phase voltage control for said first and second motor generators.
4. The power output apparatus according to claim 1, wherein said control device further includes a voltage compensation unit compensating for voltage drop caused by internal impedance of said first and second motor generators.
5. The power output apparatus according to claim 4, wherein said voltage compensation unit calculates a voltage compensation value based on AC current flowing across the neutral points of said first and second motor generators to correct a control value of the AC voltage that is to be generated across the neutral points of said first and second motor generators, using the calculated voltage compensation value.
6. The power output apparatus according to claim 1, further comprising:
a DC power supply, and
an up-converter boosting DC voltage output from said DC power supply and providing the boosted voltage onto said voltage supply line,
wherein said control device further controls an operation of said up-converter such that the DC voltage from said DC power supply is boosted to said input voltage.
7. A vehicle comprising:
the power output apparatus defined in claim 1,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
8. A vehicle comprising:
the power output apparatus defined in claim 2,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
9. A vehicle comprising:
the power output apparatus defined in claim 3,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
10. A vehicle comprising:
the power output apparatus defined in claim 4,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
11. A vehicle comprising:
the power output apparatus defined in claim 5,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
12. A vehicle comprising:
the power output apparatus defined in claim 6,
an internal combustion engine coupled to the first motor generator included in said power output apparatus, and
a driving wheel coupled to the second motor generator included in said power output apparatus, and driven by said second motor generator,
wherein the control device included in said power output apparatus controls an operation of the first and second inverters included in said power output apparatus such that said first and second motor generators are driven and AC voltage is generated across the neutral points of said first and second motor generators using said input voltage, and
said first and second motor generators output the AC voltage generated across neutral points of each other to an external electric load electrically connected between said neutral points.
13. The power output apparatus according to claim 1, further comprising an output terminal electrically connected to the neutral points of said first and second motor generators to provide the AC voltage generated across the neutral points of said first and second motor generators to an electric load.
14. The vehicle according to claim 7, further comprising an output terminal to provide the AC voltage generated across the neutral points of said first and second motor generators to said external electric load.
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 method for processing a signal, said method comprising the steps of:
precomputing branch metrics for speculative sequences of one or more channel symbols;
selecting a subset of said precomputed branch metrics based on at least one decision from at least one corresponding state using at least two pipeline stages connected in series, wherein each of said pipeline stages comprises at least one functional unit, and wherein said functional unit comprises a pipeline register and a multiplexer; and
selecting a path having a best path metric for a given state.
2. The method of claim 1, wherein an input to said functional unit comprises a subgroup of precomputed branch metrics and an output of said functional unit comprises a selected precomputed branch metric.
3. The method of claim 2, further comprising the step of combining a plurality of said selected precomputed branch metrics into one or more new subgroups for a following stage.
4. The method of claim 3, wherein said combining step is based on a bit pattern of said selected precomputed branch metrics.
5. The method of claim 3, wherein said combining step is based on a trellis structure.
6. The method of claim 3, wherein said following stage has a reduced number of subgroups than a previous stage.
7. The method of claim 1, wherein said processing of said signal is performed using a reduced-state sequence estimation technique, a delayed decision-feedback sequence estimation technique, a parallel decision-feedback equalization technique, or an implementation of a Viterbi algorithm.
8. The method of claim 1, wherein said processing of said signal employs a trellis that includes syndrome information for a parity check code.
9. The method of claim 1, further comprising the steps of:
processing a received signal using an FIR equalizer to generate an equalized received signal; and
processing said equalized received signal using a noise-predictive FIR filter to generate said signal,
wherein channel coefficients used to precompute said branch metrics are a convolution of impulse responses of said FIR equalizer and said noise-predictive FIR filter.
10. The method of claim 1, further comprising the steps of:
processing a received signal using an FIR equalizer to generate an equalized received signal; and
processing said equalized received signal using a plurality of noise-predictive FIR filters to generate a plurality of signals,
wherein said step of precomputing branch metrics uses an output of one of said plurality of noise-predictive FIR filters based on characteristics of the data.
11. The method of claim 1, wherein said decision is an ACS decision.
12. The method of claim 1, further comprising the step of storing survivor symbols in a survivor memory using a trace back architecture, wherein said survivor memory stores said ACS decisions as pointers, and said pointers are used to trace back a survivor path to produce the detected data.
13. A method for processing a signal, said method comprising the steps of:
precomputing branch metrics for speculative sequences of one or more channel symbols;
selecting one of said precomputed branch metrics based on at least one decision from at least one corresponding state using at least one pipeline register,
selecting a path having a best path metric for a given state; and
storing survivor symbols in a survivor memory using a trace back architecture.
14. The method of claim 13, wherein said survivor memory stores said ACS decisions as pointers, and said pointers are used to trace back a survivor path to produce the detected data.