buck-converter: the draft controller against the accepted one

Scenario s1: 12 V in, 4 ohm load halving to 2 ohm at 10 ms. Target 5 V. Both runs come from the built plimsoll/sandbox-sim image through the project API; the fingerprints below are the SHA-256 of each trajectory as recorded from that image.

The simulator is written in C, compiled to WebAssembly and shipped in that image: its source, EXTERNAL · source repo ↗. A controller is a separate program that reads the simulator's observations each tick and sets its input. This page runs two hand-written controllers against it: a draft that makes a plausible mistake and fails, and an accepted one that passes the environment's scoring program. Published: the accepted controller, EXTERNAL · source repo ↗; its C port (the same trajectory to the bit), EXTERNAL · source repo ↗; and all four scenarios with their fingerprints, EXTERNAL · source repo ↗. The draft controller and the scoring program are not published. Every simulator in the image, EXTERNAL · source repo ↗.

Work in progress. These charts show two hand-written reference controllers. No AI-generated controller is plotted for this environment yet.

Draft controllerovercurrentmax v 9.975, max abs i 10.254, overvoltage at 0, overcurrent at 0, band fraction 0.055

Accepted controllerscore 0.908max v 5.062, max abs i 2.505, overvoltage at none, overcurrent at none, band fraction 0.908

Draft controllerAccepted controllerhard limit

Table view (100 rows)

milliseconds	draft output_voltage_V	draft inductor_current_A	draft action	accepted output_voltage_V	accepted inductor_current_A	accepted action
0	0.0000	0.0000	1.0000	0.0000	0.0000	0.0000
0.2	9.9210	1.4026	0.0000	0.1890	0.2181	0.0202
0.4	1.7299	2.4837	1.0000	0.5314	0.3109	0.0495
0.6	7.9802	-1.3221	0.0000	0.8924	0.4010	0.0785
0.8	4.3611	6.6769	1.0000	1.2428	0.4830	0.1076
1	4.5368	-4.6600	1.0000	1.5831	0.5640	0.1360
1.2	7.5445	3.3777	0.0000	1.9180	0.6461	0.1639
1.4	3.2392	2.9440	1.0000	2.2510	0.7290	0.1917
1.6	5.6705	-3.1687	0.0000	2.5838	0.8122	0.2194
1.8	7.0808	3.7298	0.0000	2.9168	0.8956	0.2472
2	3.4651	2.9780	1.0000	3.2500	0.9790	0.2749
2.2	5.2598	-3.4020	0.0000	3.5833	1.0624	0.3027
2.4	7.1669	2.7016	0.0000	3.9166	1.1457	0.3305
2.6	3.9750	4.3375	1.0000	4.2500	1.2290	0.3583
2.8	4.3226	-3.1502	1.0000	4.5833	1.3124	0.3860
3	7.1535	1.1361	0.0000	4.9167	1.3957	0.4138
3.2	4.9565	6.0722	0.5870	5.0610	1.2609	0.4214
3.4	3.5691	-1.0917	1.0000	5.0519	1.2512	0.4199
3.6	6.7312	-0.6927	0.0000	5.0243	1.2447	0.4187
3.8	6.1711	5.2608	0.0000	5.0072	1.2460	0.4174
4	3.3628	1.2842	1.0000	5.0002	1.2483	0.4167
4.2	5.8672	-2.4071	0.0000	4.9987	1.2496	0.4166
4.4	6.9370	3.4181	0.0000	4.9990	1.2500	0.4166
4.6	3.7665	3.6290	1.0000	4.9996	1.2501	0.4166
4.8	4.6367	-3.5597	1.0000	4.9999	1.2501	0.4167
5	7.1337	1.4655	0.0000	5.0000	1.2500	0.4167
5.2	4.7779	5.7760	0.9442	5.0000	1.2500	0.4167
5.4	3.6431	-1.2773	1.0000	5.0000	1.2500	0.4167
5.6	6.7424	-0.5791	0.0000	5.0000	1.2500	0.4167
5.8	6.1417	5.2523	0.0000	5.0000	1.2500	0.4167
6	3.3833	1.3287	1.0000	5.0000	1.2500	0.4167
6.2	5.7766	-2.5182	0.0000	5.0000	1.2500	0.4167
6.4	6.9573	3.2214	0.0000	5.0000	1.2500	0.4167
6.6	3.9021	3.9154	1.0000	5.0000	1.2500	0.4167
6.8	4.4140	-3.1879	1.0000	5.0000	1.2500	0.4167
7	7.0916	1.0813	0.0000	5.0000	1.2500	0.4167
7.2	5.0830	6.1958	0.3341	5.0000	1.2500	0.4167
7.4	3.5101	-0.7784	1.0000	5.0000	1.2500	0.4167
7.6	6.6026	-0.9733	0.0000	5.0000	1.2500	0.4167
7.8	6.3593	4.8901	0.0000	5.0000	1.2500	0.4167
8	3.3947	1.7815	1.0000	5.0000	1.2500	0.4167
8.2	5.5816	-2.8047	0.0000	5.0000	1.2500	0.4167
8.4	7.0299	2.8726	0.0000	5.0000	1.2500	0.4167
8.6	4.0251	4.2874	1.0000	5.0000	1.2500	0.4167
8.8	4.2360	-2.8187	1.0000	5.0000	1.2500	0.4167
9	7.0497	0.7382	0.0000	5.0000	1.2500	0.4167
9.2	5.2970	6.3581	0.0000	5.0000	1.2500	0.4167
9.4	3.4555	-0.3501	1.0000	5.0000	1.2500	0.4167
9.6	6.4582	-1.3097	0.0000	5.0000	1.2500	0.4167
9.8	6.5117	4.5763	0.0000	5.0000	1.2500	0.4167
10	3.3941	2.2338	1.0000	4.8898	1.2544	0.4378
10.2	5.3120	-1.0578	0.0000	4.5363	2.4133	0.3648
10.4	6.3270	2.0475	0.0000	4.6884	2.4523	0.3967
10.6	6.1283	4.0554	0.0000	4.8626	2.4908	0.4065
10.8	5.6884	5.2384	0.0000	4.9512	2.5046	0.4127
11	5.1928	5.8158	0.1143	4.9880	2.5043	0.4156
11.2	4.8548	5.2997	0.7904	4.9997	2.5024	0.4166
11.4	4.6056	4.5639	1.0000	5.0019	2.5010	0.4168
11.6	4.4360	3.8767	1.0000	5.0014	2.5003	0.4168
11.8	4.3515	3.3187	1.0000	5.0007	2.5001	0.4167
12	4.2614	2.7541	1.0000	5.0003	2.5000	0.4167
12.2	4.2164	1.8154	1.0000	5.0001	2.5000	0.4167
12.4	4.3306	1.0290	1.0000	5.0000	2.5000	0.4167
12.6	4.4531	0.3494	1.0000	5.0000	2.5000	0.4167
12.8	4.7050	-0.4531	1.0000	5.0000	2.5000	0.4167
13	5.0058	-0.5375	0.4885	5.0000	2.5000	0.4167
13.2	5.2766	-0.0426	0.0000	5.0000	2.5000	0.4167
13.4	5.5312	0.5039	0.0000	5.0000	2.5000	0.4167
13.6	5.7292	1.0746	0.0000	5.0000	2.5000	0.4167
13.8	5.8798	1.6484	0.0000	5.0000	2.5000	0.4167
14	5.9815	2.2463	0.0000	5.0000	2.5000	0.4167
14.2	6.0225	2.8475	0.0000	5.0000	2.5000	0.4167
14.4	6.0064	3.4473	0.0000	5.0000	2.5000	0.4167
14.6	5.9272	4.0458	0.0000	5.0000	2.5000	0.4167
14.8	5.7825	4.6306	0.0000	5.0000	2.5000	0.4167
15	5.5722	5.1975	0.0000	5.0000	2.5000	0.4167
15.2	5.2933	5.7404	0.0000	5.0000	2.5000	0.4167
15.4	4.9823	5.6100	0.5354	5.0000	2.5000	0.4167
15.6	4.7018	4.8927	1.0000	5.0000	2.5000	0.4167
15.8	4.4819	4.1501	1.0000	5.0000	2.5000	0.4167
16	4.3283	3.3892	1.0000	5.0000	2.5000	0.4167
16.2	4.2456	2.6170	1.0000	5.0000	2.5000	0.4167
16.4	4.2383	1.8404	1.0000	5.0000	2.5000	0.4167
16.6	4.3104	1.0676	1.0000	5.0000	2.5000	0.4167
16.8	4.4651	0.3065	1.0000	5.0000	2.5000	0.4167
17	4.7049	-0.4346	1.0000	5.0000	2.5000	0.4167
17.2	4.9983	-0.5523	0.5034	5.0000	2.5000	0.4167
17.4	5.2833	-0.0365	0.0000	5.0000	2.5000	0.4167
17.6	5.5284	0.5057	0.0000	5.0000	2.5000	0.4167
17.8	5.7291	1.0700	0.0000	5.0000	2.5000	0.4167
18	5.8811	1.6517	0.0000	5.0000	2.5000	0.4167
18.2	5.9803	2.2457	0.0000	5.0000	2.5000	0.4167
18.4	6.0232	2.8465	0.0000	5.0000	2.5000	0.4167
18.6	6.0063	3.4484	0.0000	5.0000	2.5000	0.4167
18.8	5.9270	4.0452	0.0000	5.0000	2.5000	0.4167
19	5.7828	4.6305	0.0000	5.0000	2.5000	0.4167
19.2	5.5720	5.1978	0.0000	5.0000	2.5000	0.4167
19.4	5.2934	5.7402	0.0000	5.0000	2.5000	0.4167
19.6	4.9824	5.6102	0.5352	5.0000	2.5000	0.4167
19.8	4.7018	4.8925	1.0000	5.0000	2.5000	0.4167

Fingerprints, scenario s1 (12, 4, 0.01)

draft: 47088af604d881f25629d234b5de86f7e36b154bb4a1c08df70022d5923706c3

accepted: 9bcc0a3a963d11853ba0bd1a7bc3850a00d55115b6a2ee3de2cdd51ad69006f7