Circuit assembly for operating a load
A circuit assembly for operating a load may include an input for inputting an input voltage and/or current. The circuit assembly may further include an output for outputting an output voltage and/or current. The circuit assembly may further include an at least partially digital switching regulator with a feedback loop. A loop gain of the feedback loop may be frequency-dependent where the frequency ranges from 3 Hz to 20 Hz.
1. A circuit assembly for operating a load, comprising:
an input for inputting an input voltage and/or current;
an output for outputting an output voltage and/or current; and
a switching regulator with a feedback loop,
wherein the feedback loop includes: a micro-controller; and
an integrator having a frequency-dependent gain;
wherein a loop gain of the feedback loop is frequency-dependent; and
wherein the loop gain of the feedback loop in the frequency range below 100 Hz is greater than the loop gain in the frequency range above 100 Hz;
wherein the integrator comprises an operational amplifier directly connected to a resistor and a capacitor; and
wherein a second feedback loop is formed between the operational amplifier and the capacitor.
2. The circuit assembly as claimed in claim 1 , in which a power converter comprises a step-up converter, a buck converter, flyback converter, SEPIC converter, Cuk converter, LLC, LCC, or DARC converter.
3. The circuit assembly as claimed in claim 1 , wherein the switching regulator:
has a switching transistor, an inductor, and a current valve, wherein
the current valve is actively controlled, and
the switching regulator is operated in a forced continuous mode.
4. The circuit assembly as claimed in claim 1 , wherein the load consists of LEDs.
5. The circuit assembly as claimed in claim 1 , wherein the loop gain at 10 Hz is 55 dB and the loop gain at 100 Hz is 35 dB.
6. The circuit assembly as claimed in claim 1 , wherein a two-point regulation scheme is provided, which has a lower threshold and an upper threshold.
7. The circuit assembly as claimed in claim 6 , wherein the lower threshold, which describes the switch-off time of the current valve in the forced continuous mode, is defined for a negative choke current.
8. The circuit assembly as claimed in claim 7 , wherein the lower threshold is lower for a lower output voltage than for a higher output voltage.
9. The circuit assembly as claimed in claim 7 , wherein for a lower output voltage, an additional delay time dependent on the output voltage is inserted after reaching the lower threshold, to delay the switch-off time of the current valve.
10. The circuit assembly as claimed in claim 6 , wherein the upper threshold, which describes the switch-off time of the switching transistor, is defined by the output current of the circuit assembly to be controlled and the switch-off time of the current valve.