Back to results
US 2002/0181255 A1Published application
Control circuit for the power controlled operation of a load
AssigneeStribel GmbH
InventorsHorst Flock, Ignaz Fortmeier
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeStribel GmbH
InventorsHorst Flock, Ignaz Fortmeier
Estimating the term…
To improve a control circuit for the power-controlled operation of a load, comprising a semiconductor switch which is effective in a load circuit and comprising a drive circuit for the semiconductor switch, which generates a control signal, comprising drive pulses following one after the other and separated by interpulse periods, for controlling the said semiconductor switch in a part-load range, in such a way that as little heat as possible is generated, it is proposed that the control signal should generate in an upper part-load range a first pulse signal, with first individual pulses following one another with a first pulse frequency, and a second pulse signal, with second individual pulses following one another with a second frequency, in the interpulse periods of the first pulse signal, and that the second frequency should be greater than the first frequency by at least a factor of 10.
Control circuit for the power-controlled operation of a load, comprising a semiconductor switch which is effective in a load circuit and comprising a drive circuit for the semiconductor switch, which generates a control signal, comprising drive pulses following one after the other and separated by interpulse periods, for controlling the said semiconductor switch in a part-load range, characterized in that the control signal (S) generates in an upper part-load range (OT) a first pulse signal (P1), with first individual pulses (PE1) following one another with a first pulse frequency (f1), and a second pulse signal (P2), with second individual pulses (PE2) following one another with a second frequency (f2), in the interpulse periods (PP) of the first pulse signal (P1), and in that the second frequency (f2) is greater than the first frequency (f1) by at least a factor of 10.
Control circuit according to one of the preceding claims, characterized in that, in a lower part-load range (UT) lying below the upper part-load range (OT), the control signal (S) comprises a third pulse signal (P2) with a third frequency (f2), which is greater than the first frequency (f1).
Control circuit according to one of the preceding claims, characterized in that the second frequency (f2) and/or the third frequency (f2) is greater than the first frequency (f1) by a factor of the order of magnitude of 30 or more.
Control circuit according to one of the preceding claims, characterized in that the drive circuit (20) has a pulse generator (22) and a pulse-shaping stage (24).
Control circuit according to one of the preceding claims, characterized in that the first pulse signal (P1) and the second pulse signal (P2) can be generated as pulse signal trains (P1, P2) having individual pulses (PE1, PE2) following continuously one after the other with constant frequency (f1, f2) and in that the control signal (S) for the upper part-load range (OT) is produced from the pulse signal trains (P1, P2) by conducting an OR operation.
Method for the power-controlled operation of a load by means of a control circuit, comprising a semiconductor switch which is effective in a load circuit and comprising a drive circuit for the semiconductor switch, which generates a control signal, comprising drive pulses following one after the other and separated by interpulse periods, for controlling the said semiconductor switch in a part-load range, characterized in that the control signal (S) is generated in an upper part-load range (OT) in such a way that it has a first pulse signal (P1), with individual pulses (PE1) following one another with a first pulse frequency (f1), and a second pulse signal (P2), with individual pulses (PE2) following one another with a second pulse frequency (f2), in the interpulse periods (PP) of the first pulse signal (P1), and in that the second pulse frequency (f2) is greater than the first pulse frequency (f1) by at least a factor of 10.
Dependencies are inferred from the claim text.