| 摘要 |
An ECM. Current sensing units (HALL1, HALL2, HALL3, HALL4, HALL5) detect signals of a plurality of shift input lines (N1, N2, N3, N4, N5), wherein the signals are 24V low-voltage alternating-current signals or 115V or 230V high-voltage alternating-current signals. When the 24V low-voltage alternating-current signals are input into the shift input lines (N1, N2, N3, N4, N5), a second alternating-current input end of a power supply portion is connected to a second power input line L, and second input ends of the current sensing units (HALL1, HALL2, HALL3, HALL4, HALL5) are connected in parallel and then are connected to a common lead COM, wherein the 24V low-voltage alternating-current signals are input into the shift input lines (N1, N2, N3, N4, N5) through a protection circuit. The protection circuit comprises a plurality of circuit protection units; and each circuit protection unit is separately connected one shift input line and at least comprises a diode (D1, D2, D3, D4, D5). The ECM has a simple structure and can conveniently replace a PSC motor or an ECM using a 24V AC signal as the shift input on the market, the replacement is simple, the wiring is convenient, and the cost is low. When the ECM using the 24V AC signal as the shift input on the market is replaced, false triggering of other power supply components in an air conditioning system due to a signal coupling phenomenon among the shifts can be effectively prevented and therefore the safety and reliability are high, and the ECM has the strong market competitive force. |
