High voltage circuit for electrical stimulation

A remote-receiving circuit (1) for providing and controlling an electric stimulus applied to an animal, the circuit (1) comprising:

• an isolated DC/DC converter (4) having a low voltage input powered by an energy source (3) and a high voltage output connected to a storage capacitor (8) suitable to be charged with stimulus energy by said converter (4);
• a first electrode (5) and a second electrode (6) configured to be in contact with the animal for delivering to it high voltage stimulus current and connected to the respective ends of said storage capacitor (8);
• a high-voltage current-limiting circuit (9) connected in series with the storage capacitor (8) to control the stimulus current delivered to the animal through the electrodes (5, 6), said high-voltage current-limiting circuit (9) comprising at least a resistor (9B) in series with a switching transistor (9A), so that
• in a first phase, the isolated DC/DC converter (4) charges the storage capacitor (8) to a high voltage, while the current-limiting circuit (9) limits to zero the stimulus current delivered to the animal through the first and second electrodes (5, 6);
• and
• in a second phase, while the storage capacitor (8) is discharging, the current-limiting circuit (9) generates a low-frequency pulsed stimulus current delivered to the animal through the first and second electrodes (5, 6), said current being controlled in duration, peak amplitude and shape.