Rotating speed sensor

Abstract

The utility model relates to a rotating speed sensor, a sensing circuit of the sensor comprises a Hall chip (U106), and the rotating speed sensor is characterized in that two paths of signals with phase difference generated by the Hall chip (U106) enter a trigger (U105) and then output a steering signal, and the steering signal is externally output through an operational amplifier (U107B). And any one of the two paths of signals generated by the Hall chip (U106) passes through the operational amplifier (U107A) and then is output outwards. According to the rotating speed sensor provided by the utility model, the accurate and rapid identification of forward and reverse rotation is realized based on the touch sensor and the comparator, so that the existence of a single chip microcomputer is replaced, the whole circuit structure is simpler, the signal detection is more reliable, and the product can be applied to occasions with high-quality requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotating speed sensor, especially a rotating speed sensor based on hall principle. BACKGROUND

[0002] At present, the hall sensing principle is one of important ways to realize non-contact monitoring, such as the Chinese patent ZL201810495705.3 "DVVA special compact hall displacement sensor and its assembling method" and the Chinese patent ZL201320103080.4 "Distribution pump electric control rotary oil volume actuator" applied by the company, which realizes the monitoring of displacement and rotating speed through the hall chip, especially the monitoring of rotating speed, and the measurement is more convenient and accurate after using the hall chip. However, the circuit of the rotating speed sensor on the market adopts discrete components, and the signal needs to be processed by a single-chip microcomputer to identify the forward and reverse rotation, so the overall circuit structure is relatively complex, which undoubtedly increases the production difficulty and cost. Moreover, since the rotating speed monitoring is generally applied in high-speed occasions (such as vehicle-mounted environment or industrial processing environment), the working condition is relatively harsh, and the failure rate of too many discrete components is unsatisfactory, which cannot meet the high quality requirements. Therefore, a simpler and more reliable signal processing circuit is needed to solve the above problems. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned insufficient, provides a rotating speed sensor, and the accurate and rapid identification of forward and reverse rotation is realized based on the flip-flop and comparator, so that the single-chip microcomputer is replaced, the overall circuit structure is simpler, and the signal detection is more reliable, and the product can be applied to occasions with high quality requirements.

[0004] The utility model aims at overcoming the above-mentioned insufficient, provides a rotating speed sensor, and the accurate and rapid identification of forward and reverse rotation is realized based on the flip-flop and comparator, so that the single-chip microcomputer is replaced, the overall circuit structure is simpler, and the signal detection is more reliable, and the product can be applied to occasions with high quality requirements.

[0005] A rotating speed sensor, the sensing circuit of the sensor comprises a hall chip, two signals with phase difference generated by the hall chip enter the flip-flop and output the turning signal, the turning signal is outputted by the operational amplifier, and any one of the two signals generated by the hall chip is outputted by the operational amplifier.

[0006] Preferably, the two signals with 90° phase difference generated by the hall chip are signal one and signal two, signal one is led out from the A port of the No. 1 pin, divided into two paths through a resistor, one path is directly connected to the input port D port of the No. 3 pin of the flip-flop, and the other path is connected to the non-inverting input terminal of the operational amplifier; signal two is connected to the clock port CLK port of the No. 1 pin of the flip-flop after being led out from the B port of the No. 2 pin, the output port Q port of the flip-flop is connected to the non-inverting input terminal of the operational amplifier through a resistor, and the output terminal of the operational amplifier is connected to the No. 4 pin of the output interface through a resistor and an inductor; the output terminal of the operational amplifier is connected to the No. 3 pin of the output interface after passing through a resistor and an inductor.

[0007] Preferably, the sensing circuit further comprises a power supply circuit, the power supply circuit comprises a power supply chip, the power supply current introduced by the No. 1 pin of the output interface is input to the input No. 1 pin of the power supply chip through a diode and an inductor, and the No. 8 pin of the power supply chip outputs a high level VCC after passing through an inductor.

[0008] Compared with the prior art, the utility model has the beneficial effects that:

[0009] The utility model discloses a trigger to the phase difference of the signal of hall chip and obtains the analysis and thus quickly distinguish the steering, and compared with the single-chip microcomputer mode of the combination of conventional multiple separation devices, the structure is simpler and more reliable, and the cost is also more low -cost. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the circuit diagram of hall chip and sensor in a rotational speed sensor of the utility model.

[0011] Figure 2 And Figure 3 It is the circuit diagram of two operational amplifiers in a rotational speed sensor of the utility model.

[0012] Figure 4 It is the circuit diagram of output interface in a rotational speed sensor of the utility model.

[0013] Figure 5 It is the circuit diagram of power supply circuit in a rotational speed sensor of the utility model. DETAILED DESCRIPTION

[0014] Embodiment one: see Figures 1-4 The utility model relates to a rotational speed sensor, the sensing circuit of sensor contains hall chip U106, its model number is SC60224, it exports two groups of signals (signal one and signal two are introduced from the No. 1 pin A mouth and No. 2 pin B mouth of hall chip U106 respectively) according to the magnetic flux variation caused by the rotation of magnetic steel, and the phase difference of two groups of signals is 90 DEG, signal one is divided into two ways after being introduced from the No. 1 pin A mouth through resistance R149, one way is directly connected to the input port No. 3 pin D mouth of flip-flop U105 (the model number of flip-flop is SN74LVC1G175DBVR), and the other way is connected to the noninverting input terminal of operational amplifier U107A.

[0015] The signal two is connected to the clock port 1st pin CLK port of the flip-flop U105 after being led out from the B port of the 2nd pin. When the phase of the signal one is 90° ahead of the phase of the signal two, the output port 4th pin Q port of the flip-flop U105 outputs high level, indicating that the measuring shaft of the fixed magnetic steel is in the positive rotation state. When the phase of the signal one is 90° behind the phase of the signal two, the output port 4th pin Q port of the flip-flop U105 outputs low level, indicating that the measuring shaft of the fixed magnetic steel is in the reverse rotation state. Then the output port 4th pin Q port of the flip-flop U105 is connected to the non-inverting input terminal of the operational amplifier U107B through the resistor R121. The inverting input terminal of the operational amplifier U107B is grounded through the resistor R147, and the high level VCC is connected to the inverting input terminal of the operational amplifier U107B through the resistor R144. The output terminal of the operational amplifier U107B is connected to the 4th pin of the output interface J1 through the resistor R148 and the inductor L104, and the other end of the inductor L104 is connected to the negative electrode of the diode D105, and the positive electrode of the diode D105 is grounded.

[0016] Meanwhile, the inverting input terminal of the aforementioned operational amplifier U107A is grounded through the resistor R142, and the high level VCC is connected to the inverting input terminal of the operational amplifier U107A through the resistor R141. The output terminal of the operational amplifier U107A is connected to the 3rd pin of the output interface J1 through the resistor R143 and the inductor L103, and the 3rd pin of the output interface J1 is connected to the negative electrode of the diode D104 through the inductor L103, and the positive electrode of the diode D104 is grounded. The 1st pin of the output interface J1 is connected to the power supply circuit, and the power supply is introduced through the 1st pin of the output interface J1. The 2nd pin of the output interface J1 is grounded, and the 3rd-6th pins of the output interface J1 are respectively grounded through two coupling capacitors.

[0017] Referring to Figure 5 , the power supply circuit comprises a power supply chip U101 (the model number of which is SQ27692). The power supply current introduced from the 1st pin of the output interface J1 is input to the input terminal 1st pin of the power supply chip U101 through the diode D102 and the inductor L102. The 8th pin of the power supply chip U101 outputs the high level VCC through the inductor L101.

[0018] The model number of the power management chip U102 is MCP1700T-3302E / MB. The high level VCC output by the power supply circuit is connected to the input port 2nd pin VIN port of the power management chip U102.

[0019] The utility model discloses a working time: the signal of hall chip U106 produces one as the rotating speed signal through the output interface J1 output after amplifying U107A through operational amplifier, and signal one and signal two input flip-flop U105 trigger after triggering, and the trigger signal of the output mouth 4 foot Q mouth of flip-flop U105 can be steering signal, and then the steering signal is output to the car system through the output interface J1 after U107B through operational amplifier, and the signal of hall chip U106 produces one as the rotating speed signal through the output interface J1 output after amplifying U107A through operational amplifier, and signal one and signal two input flip-flop U105 trigger after triggering, and the trigger signal of the output mouth 4 foot Q mouth of flip-flop U105 can be steering signal, and then the steering signal is output to the car system through the output interface J1 after U107B through operational amplifier.

[0020] When the application, the sensor sensing circuit is installed in the shell of sensor, and the output interface J1 is embedded on the shell for the plug-in electric control connection with the car system; The measuring shaft with magnetic steel on the top is located directly below the hall chip U106, and across the shell, so that the hall chip U106 obtains the rotating speed and steering information of the measuring shaft through the non-contact mode of magnetic coupling, the measuring shaft can be integrated with the shell structure, also can adopt split structure, which belongs to the prior art known to the customer required use scene determines, it belongs to the prior art known to the customer required use scene determines.

[0021] Embodiment two: the difference with embodiment one is: when part of the user does not need to output steering signal directly, but needs the hall chip U106 to output two-way signal directly, at this moment, resistance R121 is no longer welded, sets up resistance R120, and one end of resistance R120 is connected to the hall chip U106 2 no. B mouth, and the other end is connected to the in-phase input end of operational amplifier U107B, at this moment, signal one and signal two are outputted externally through the output interface J1 after U107A and U107B through operational amplifier.

[0022] In addition: it needs to be noticed that the above specific embodiment is only an optimization scheme of the patent, and any change or improvement made by the person skilled in the art according to the above concept is within the protection scope of the patent.

Claims

1. A rotational speed sensor, the sensor's sensing circuit comprising a Hall chip (U106), characterized in that: The two-phase signals with phase difference generated by the Hall chip (U106) enter the flip-flop (U105) and output the steering signals, the steering signals are outputted through the operational amplifier (U107B), and any one of the two signals generated by the Hall chip (U106) is outputted through the operational amplifier (U107A).

2. The rotational speed sensor according to claim 1, characterized in that: The signal one and signal two generated by the Hall chip (U106) with a phase difference of 90°, the signal one is led out from the No.1 pin A port and divided into two paths through the resistor (R149), one path is directly connected to the input port No.3 pin D port of the flip-flop (U105), and the other path is connected to the non-inverting input terminal of the operational amplifier (U107A); The signal two is led out from the No.2 pin B port and connected to the clock port No.1 pin CLK port of the flip-flop (U105), the output port No.4 pin Q port of the flip-flop (U105) is connected to the non-inverting input terminal of the operational amplifier (U107B) through the resistor (R121), and the output terminal of the operational amplifier (U107B) is connected to the No.4 pin of the output interface (J1) through the resistor (R148) and the inductor (L104); The output terminal of the operational amplifier (U107A) is connected to the No.3 pin of the output interface (J1) through the resistor (R143) and the inductor (L103).

3. The rotational speed sensor according to claim 2, characterized in that: The power supply circuit contains the power supply chip (U101), the power supply current led in from the No.1 pin of the output interface (J1) is inputted into the input terminal No.1 pin of the power supply chip (U101) through the diode (D102) and the inductor (L102), and the No.8 pin of the power supply chip (U101) outputs the high level VCC through the inductor (L101).

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