| 摘要 |
<p>The difference temperature TD between an actual temperature TA and a setpoint temperature TSP passes through PID (proportional, integral, and differential) circuitry 17 to give a target temperature TT. An error temperature TE is the difference between TT and a delivered water temperature TDW, and drives a flip-flop FF1 via a hysteresis circuit 21. FF1 produces a control signal for turning on a heat source HS, from which hot water is pumped to a radiator R. The heat source HS may be a heat pump, which draws a transient high inrush current when turned on. To minimize the inrush currents, a timer TMR1 is triggered by the control signal and prevents (by logic 22-24) the generation of a further control signal until the timer period has expired. The system may be implemented by a microprocessor.</p> |
