As light cavalry you really need to be creative if you want to thrive on the battlefield. I can recall a linebattle where I led the 7de as Hungarian hussars and we repeatedly managed to flank and destroy the enemy army by using hills and trees to conceal our movements. We also eliminated their best means of support by butchering their artillery at the offset of every round. And then with their artillery out of the equation, we would merely circle around the enemy army, going from tree to tree and hill to hill until we were positioned practically in line with the cracks of their asses and then ride through them, slashing through their ranks and decimating them. I saw a video of that lb from their point of view and it was an impressive sight. The enemy lines were firing upon our lines and then suddenly blood flies and a hussar flies past the line and then suddenly many more hussars smash through and being putting them to the saber.
My point is that if you want to keep cavalry from charging you, put your artillery in a position with a lot of open ground between them and the enemy cavalry and where their backs are covered either by the map edges or by rough terrain (IE- rivers, mountains, large bodies of water) that way there is no cover to keep the enemy cavalry concealed from artillery and musket fire, they can't flank you, and if they do try to charge you, you'll have a cannon putting fire on them until they reach you. Smart cavalry will avoid crossing massive areas of open ground especially when exposed to artillery fire.