Patent ID: 11965757
Assignee: GUILIN GUANGLU MEASURING INSTRUMENT CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 7:
8. The hybrid positioning electromagnetic induction displacement sensor according to claim 1, comprising
a synchronous delay circuit consisting of 3 D-type flip-flops (FF21, FF22, FF23); a last output signal (Q3) of the line voltage scanning control signal generator (5) connected to a clock end of a first D-type flip-flop (FF21) is used as an input clock of the circuit, an initializing signal (INI) output by the microcontroller (13) presets the three D-type flip-flops to 1, 1, and 0, respectively, such that an output signal (CE) is in a low electrical level; first two D-type flip-flops (FF21, FF22) form a 2-bit asynchronous subtraction counter to count down a rising edge of an input clock (Q3); and when a rising edge of a fourth input clock (Q3) arrives, the output signal (CE) jumps to a high electrical level;
after the output signal (CE) of the synchronous delay circuit jumps to the high electrical level, the up counter (10) starts counting from 0, and the synchronous capture circuit removes capture blockade; and
a synchronous capture circuit consisting of two D-type flip-flops (FF31, FF32) and an AND gate (AG31); the initializing signal (INI) output by the microcontroller (13) asynchronously clears two D-type flip-flops (FF31, FF32) to 0, and blocks capture of the counting value of the up counter (10) before a delay time; the output signal (CE) of the synchronous delay circuit jumps to the high electrical level at the delay time, a square wave signal (UZ) output by the analog signal processing circuit sets an output signal (CS) of the first D-type flip-flop (FF31) to the high electrical level at a first rising edge afterwards, and an output signal (CP) of the AND gate (AG31) has been the same as the square wave signal (UZ) since then; after synchronizing the output signal (CP) of the AND gate (AG31) with a falling edge of a system clock, the second D-type flip-flop (FF32) separately captures the counting value of the up counter (10) in a synchronized manner on the rising edge and the falling edge of the square wave signal (UZ), which are respectively stored in two random access memories (11, 12), to obtain a quantization code of the spatial phase or displacement of the measured position within the pitch of the three-phase receiver winding connected to the processing channel.