Method for setting switching times, in particular idle times, of an inverter based on detected power, and inverter
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Abstract
The invention concerns a method for an inverter, for inputting power output by a direct current voltage source (2) in an alternating current voltage network (3), whereby the direct current voltage source (2) is chopped, by means of a bridge inverter (5) by alternate switching of parallel-mounted and series-mounted circuit elements (6-9), in the form of a pulse width modulation, and said chopped power is transmitted via a transformer (18) which is connected between the series-mounted elements (6-9). The transmitted power is then rectified and input in the alternating current voltage network (3) via a down-converter transformer (22). In order to adapt the inverter to the power supplied, the switching times of the circuit elements (6-9) of the bridge inverter (5) are controlled or regulated. The invention aims at providing a simple way of enhancing performance. Therefor, the power output by the direct current voltage source (2) is detected in particular on a cyclic or permanent basis and the switching times of the circuit elements (6-9) of the bridge inverter (5), in particular the idle times (42) and/or the interval duration (55) and or the frequency for pulse width modulation, for switching the circuit elements (6-9) are adjusted based on the detected power of the direct current voltage source (2).
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17 Claims
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1-9. -9. (canceled)
- 10. A method for an inverter, in particular for a solar inverter (1), for feeding energy produced by a d.c. voltage source (2) into an a.c. voltage grid (3), in which the energy produced by the d.c. voltage source (2) is chopped in the form of a pulse width modulation by a bridge inverter (5), by alternate switching of switching elements (6-9) connected in parallel and connected in series, and this chopped energy is transmitted via a transformer (18) which is connected between the switching elements (6-9) that are connected in series, whereupon the energy transmitted is rectified again and fed into the a.c. voltage grid (3) via a buck chopper (22), wherein, for a power adaptation, the switching times of the switching elements (6-9) of the bridge inverter (5) are controlled, or regulated, respectively, wherein the energy produced by the d.c. voltage source (2), is detected at intervals which are cyclical, in particular, or detected permanently, and in that a dead time (42) of the switching elements (6-9) of the bridge inverter (5) is set as a function of the detected energy of the d.c. voltage source (2).
- 16. An inverter, in particular a solar inverter (1), for feeding energy produced by a d.c. voltage source (2) into an a.c. voltage grid (3), said inverter comprising a bridge inverter (5), a transformer (18), a rectifier (21), a back chopper (22) including a full bridge and an output filter (23), a control device (24) being provided for controlling the parameters of the inverter (1), wherein a device for detecting the energy produced by the d.c. voltage source (2) is provided, which device is connected to the control device (24), and in that the bridge inverter (5) is designed for adapting a dead time (42) for the switching elements (6-9) and/or a pulse duration (55), or frequency, respectively, for the pulse width modulation as a function of the energy detected.
Specification