Coupled oscillatory circuit for vehicle detection
A coupling oscillation and vehicle detection technology, which is applied in the direction of circuit devices, power oscillators, emergency protection circuit devices, etc., can solve the problems of transformer and transistor damage, oscillation circuit damage, and affecting the service life of vehicle detectors, so as to prevent damage, Effect of improving stability and service life
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Embodiment 1
[0016] Such as figure 1 As shown, the present invention includes that the resistance R1 is 5.6 kilohms, the resistance R2 is 5.6 kilohms, the resistance R3 is 330 kilohms, the resistance R4 is 1 thousand ohms, the resistance R5 is 1 thousand ohms, the resistance R6 is 1 thousand ohms, and the triode T , coupling transformer T1, toroidal coil L, comparator A model is LM339, diode D1, diode D2, momentary suppression diode D model is P6KE12CA and two power surge protectors, between the a terminal and b terminal of the coupling transformer T1 The toroidal coil L is connected between them, the instantaneous suppression diode D is connected in parallel at both ends of the toroidal coil L, the diode D1 and the diode D2 are connected in series between the c-terminal and the d-terminal of the coupling transformer T1 and the diode D1 and the diode D2 are reversely connected, and the coupling transformer T1 The c terminal is also connected to the collector of the resistor R4 and the trio...
Embodiment 2
[0020] The preferred specific structure of this embodiment on the basis of Embodiment 1 is as follows: the ratio of the number of turns between the primary coil and the secondary coil of the coupling transformer T1 is 1:1. Since one loop ground coil corresponds to one detection channel, the inductance generated by the loop coil has the same voltage after being processed by the coupling transformer, so that the inductance of multiple detection channels can be fused into one signal for processing.
[0021] The emitter of the transistor T is connected to the pull-down capacitor C1. It is used to filter the influence of harmonics on the triode T, thereby improving the stability of the vehicle detector.
[0022] Both the diode D2 and the terminal d of the coupling transformer T1 are grounded.
[0023] The reverse breakdown voltages of the diode D1 and the diode D2 are equal to 4.3V.
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