Power converter feedback circuit
View Patent ↗An apparatus for sensing and controlling remote load voltages, the apparatus includes a power converter, a plurality of remote loads, each remote load located in a loop connected to the power converter, and a feed back loop connected to the power converter, and physically adjacent to the power converter, wherein the feed back loop further comprises a first path and a second path, with the first path and the second path in parallel.
1. An apparatus for sensing remote load voltages, comprising:
a power converter;
a plurality of remote loads, each remote load located in a loop connected to the power converter;
a feedback loop connected to the power converter, the feedback loop being physically adjacent to the power converter, wherein the feedback loop further comprises a first path and a second path, and the first path and the second path are in parallel; and
an error amplifier connected to the feedback loop;
wherein the error amplifier has a gain defined by
Gav=(N*Ka)*(weighted average individual loop gains), wherein;
Gav is the average gain of the error amplifier,
N is the number of loops, and
Ka is a constant gain adjustment factor.
2. The apparatus of claim 1 , wherein the first path further comprises a capacitor-resistor network.
3. The apparatus of claim 1 , wherein the first path further includes a low-pass filter.
4. The apparatus of claim 1 , wherein the first path further includes a high-pass filter.
5. The apparatus of claim 1 , wherein the first path further includes a band-pass filter.
6. An apparatus for sensing remote load voltages, comprising:
a power converter;
a plurality of feedback loops, each respective feedback loop having a specified loop impedance relative to a desired loop gain and connected to an output terminal of the power converter at one end;
a plurality of loads, each load situated in a respective feedback loop at a specified distance from the power converter;
an error amplifier, including
a first one of said plurality of feedback loops including a remote load,
a second one of said plurality of feedback loops being in parallel with said first loop and being physically adjacent to said controller; said second one of said plurality of feedback loops being directly connected to a summing node input of the error amplifier;
wherein each load has a critical voltage point and the error amplifier has an output equal to a sum of a plurality of critical voltage points times the gain of each feedback loop to and including the error amplifier, the error amplifier output being defined by
E 0 =Zf ( i 1 +i 2 +i 3 + . . . +iN ),
wherein Zf is the impedance of a gain compensation network of the error amplifier,
i is the current flowing through a feedback loop, and
N represents the number feedback loops.
7. The apparatus of claim 6 , wherein the plurality of loads include at least one of a nearby load, a remote load, a converter terminal voltage and an inductor terminal voltage.
8. The apparatus of claim 6 , wherein the critical voltage point comprises one or more of a remote load, a nearby load, a converter terminal voltage, and an inductor terminal voltage.
9. The method of claim 6 , wherein the impedance is set using a resistor-capacitor network.
10. The method of claim 6 , wherein the impedance comprises a desired relative gain of each feedback loop.
11. The method of claim 6 , wherein the impedance for each feedback loop comprises configuring a specific feedback loop response.
12. The method of claim 6 , wherein each feedback loop has at least one critical point.
13. The method of claim 12 , wherein the critical point comprises one or more of a remote load, a nearby load, a converter terminal voltage, and an inductor terminal voltage.
14. An apparatus for sensing remote load voltages, comprising:
a power converter;
a plurality of feedback loops, each respective feedback loop having a specified loop impedance relative to a desired loop gain and connected to an output terminal of the power converter at one end;
a plurality of loads, each load situated in a respective feedback loop at a specified distance from the power converter;
an error amplifier, including
a first one of said plurality of feedback loops including a remote load,
a second one of said plurality of feedback loops being in parallel with said first loop and being physically adjacent to said controller; said second one of said plurality of feedback loops being directly connected to a summing node input of the error amplifier;
wherein the error amplifier has a gain defined by
Gav=(N*Ka)*(weighted average individual loop gains), wherein
Gav is the average gain of the error amplifier,
N is the number of loops, and
Ka is a constant gain adjustment factor.
15. The apparatus of claim 14 , wherein the plurality of loads include at least one of a nearby load, a remote load, a converter terminal voltage, and or inductor terminal voltage.
16. The method of claim 14 , wherein the impedance is set using a resistor-capacitor network.
17. The method of claim 14 , wherein the impedance comprises a desired relative gain of each feedback loop.
18. The method of claim 14 , wherein the impedance for each feedback loop comprises configuring a specific feedback loop response.
19. The method of claim 14 , wherein each feedback loop has at least one critical point.
20. The method of claim 19 , wherein the critical point comprises one or more of a remote load, a nearby load, a converter terminal voltage, or an inductor terminal voltage.