| 摘要 |
Invention herewith described refers to the electronic circuit for two-wire control for the bistable relays and the contactors. When the control voltage exceeds the voltage value, which is defined by the voltage divider (Rl, R2), the SCR (Silicone Controlled Rectifier) (TR1) will begin to conduct and therewith the capacitor (C5) will be charged through the electromagnet (L) and the capacitor (C6) will be charged through the resistor (R3) and the diode (D10) to the voltage defined by IC1. The transistors (T1) and (T2) are stuck. When the control voltage drops below a certain value, which is defined by the voltage divider (R1, R2) minus SCR (TR1) hysteresis or if it is removed from the terminals (A1, A2), the Silicone Controlled Rectifier (TR1) will stop to conduct, and therewith the IC1 will be disconnected from the power supply, which will allow T1 to conduct. Therewith the electric charge from the capacitor (C6) will polarize T2, which now conducts and connects the positive terminal of the capacitor (C5) with the other end of the electromagnet (L), which leads to the discharge of the capacitor (C5). The discharge current of the capacitor has the opposite direction from the charge current of the capacitor (C5) and the polarization of the electromagnet (L) is also opposite.
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