Non-magnetic meter control circuit, non-magnetic meter circuit, chip and meter

Abstract

The application provides a non-magnetic meter control circuit, a non-magnetic meter circuit, a chip and a meter. A charging circuit is connected between a first power supply and a first port, the first port is also connected to an input end of a voltage detection circuit, and an output end of the voltage detection circuit is connected to the charging circuit. When a charging voltage of an oscillation circuit does not reach a threshold voltage, the voltage detection circuit controls the charging circuit to be connected to enable the first power supply to charge the oscillation circuit. When the charging voltage of the oscillation circuit reaches the threshold voltage, the voltage detection circuit controls the charging circuit to be disconnected to enable the first power supply to stop charging the oscillation circuit. The voltage detection circuit detects the charging voltage to control the on and off of the charging circuit, and can accurately charge and stop charging the oscillation circuit, and does not have a closed loop stability problem and does not need loop gain, so that a capacitor and a resistor are omitted, and the chip cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent meter, in particular to a non-magnetic meter control circuit, a non-magnetic meter circuit, a chip and a meter. BACKGROUND

[0002] With the rapid development of electronic communication technology and Internet of Things, traditional mechanical meters are gradually replaced by intelligent meters. The metering methods of intelligent meters are various, and non-magnetic meters are widely favored due to their strong anti-interference, easy-to-control cost and good precision. At present, the working principle of the existing non-magnetic meter is that the capacitor is first charged, and when the charge accumulates to a preset amount, the capacitor is connected to an LC oscillation circuit to generate oscillation. Due to energy loss, the oscillation will attenuate. The LC oscillation circuit is placed above the meter dial. When the LC oscillation circuit is in the metal area of the dial, the inductive eddy current consumes more energy, and the oscillation attenuates faster. When the LC oscillation circuit is in the non-metal area of the dial, the oscillation attenuates slowly. By detecting the speed of LC oscillation attenuation, it can be known that the dial is currently turned to which area, and the speed of area switching can be known to determine the speed of dial rotation.

[0003] In the control chip of the existing non-magnetic meter, the charging circuit uses a voltage stabilizing circuit to charge the capacitor. The voltage stabilizing circuit includes a closed-loop control circuit composed of an operational amplifier circuit, a MOS tube, a capacitor and a resistor, so that the power supply provides a constant voltage to the oscillation circuit. In order to ensure the loop stability of the voltage stabilizing circuit, the capacitor in the voltage stabilizing circuit also requires a large size, which results in a large area of the entire voltage stabilizing circuit and increases the circuit cost. Moreover, it is difficult to determine whether the capacitor to be charged is fully charged, which causes waste of time and power consumption. SUMMARY

[0004] The main purpose of the present application is to provide a non-magnetic meter control circuit, a non-magnetic meter circuit, a chip and a meter, which aims to design a non-magnetic meter control circuit with simple structure and accurate charging control, so as to accurately charge the oscillation circuit.

[0005] In a first aspect, the present application provides a non-magnetic meter control circuit, which comprises a first port and a second port for connecting an oscillation circuit, a charging circuit and a voltage detection circuit.

[0006] The charging circuit is connected between a first power supply and the first port, and the first port is also connected to the input end of the voltage detection circuit. The output end of the voltage detection circuit is connected to the charging circuit.

[0007] The voltage detection circuit controls the charging circuit to be connected to enable the first power supply to charge the oscillation circuit when the charging voltage of the oscillation circuit does not reach a threshold voltage; and controls the charging circuit to be disconnected to enable the first power supply to stop charging the oscillation circuit when the charging voltage of the oscillation circuit reaches the threshold voltage.

[0008] In a second aspect, the application further provides a non-magnetic meter circuit, which comprises a non-magnetic meter control circuit and an oscillation circuit connected between a first port and a second port of the non-magnetic meter control circuit.

[0009] In a third aspect, the application further provides a non-magnetic meter control chip, which comprises a non-magnetic meter control circuit.

[0010] In a fourth aspect, the application further provides a non-magnetic meter, which comprises:

[0011] an oscillation circuit;

[0012] a non-magnetic meter control circuit;

[0013] a dial plate comprising an impeller, one side of the impeller comprising a metal region and a non-metal region;

[0014] The oscillation circuit is arranged close to the side of the impeller, and the oscillation circuit is connected to the non-magnetic meter control circuit.

[0015] The application provides a non-magnetic meter control circuit, a non-magnetic meter circuit, a chip and a meter. The non-magnetic meter control circuit comprises a charging circuit and a voltage detection circuit, and a first port and a second port for connecting an oscillation circuit. When the voltage detection circuit detects that the charging voltage of the oscillation circuit does not reach a threshold voltage, the voltage detection circuit controls the charging circuit to be connected to enable a first power supply to charge the oscillation circuit; and when the voltage detection circuit detects that the charging voltage of the oscillation circuit reaches the threshold voltage, the voltage detection circuit controls the charging circuit to be disconnected to enable the first power supply to stop charging the oscillation circuit. The voltage detection circuit controls the charging circuit to be turned on and turned off by detecting the charging voltage, so that the oscillation circuit can be accurately charged and stopped from being charged. There is no closed-loop stability problem, and no loop gain is needed, so that a capacitor and a resistor are saved, and the cost of the chip is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 A circuit schematic diagram of an embodiment of the non-magnetic meter control circuit provided by embodiments of the present application;

[0018] Figure 2 A circuit schematic diagram of another embodiment of the non-magnetic meter control circuit provided by embodiments of the present application;

[0019] Figure 3 A circuit schematic diagram of another embodiment of the non-magnetic meter control circuit provided by embodiments of the present application;

[0020] Figure 4 A structural schematic diagram of a non-magnetic meter control chip provided by embodiments of the present application;

[0021] Figure 5 A structural schematic diagram of a non-magnetic meter provided by embodiments of the present application.

[0022] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] The embodiments of the present application will be described in detail below with reference to the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Please refer to Figure 1 , Figure 1 A circuit schematic diagram of an embodiment of the non-magnetic meter control circuit provided by embodiments of the present application;

[0026] As shown in Figure 1 , the non-magnetic meter control circuit 100 includes a charging circuit 101, a voltage detection circuit 102, a first port 103 and a second port 104.

[0027] The first port 103 is used to connect one end of an oscillation circuit 200, and the second port 104 is used to connect the other end of the oscillation circuit 200, so that the oscillation circuit 200 forms a closed loop.

[0028] For example, the first port 103 and the second port 104 can be conductor electrodes, such as copper sheets.

[0029] Specifically, when the first port 103, the second port 104 and the closed loop formed by the oscillation circuit 200 are connected, the oscillation circuit 200 generates an oscillation signal.

[0030] In some embodiments, the charging circuit 101 is connected between the first power supply and the first port 103, the first port 103 is further connected to the input of the voltage detection circuit 102, and the output of the voltage detection circuit 102 is connected to the charging circuit 101.

[0031] Specifically, the voltage detection circuit 102 controls the charging circuit 101 to be connected when the charging voltage of the oscillation circuit 200 does not reach the threshold voltage, so that the first power supply charges the oscillation circuit 200; the voltage detection circuit 102 controls the charging circuit 101 to be disconnected when the charging voltage of the oscillation circuit 200 reaches the threshold voltage, so that the first power supply stops charging the oscillation circuit 200. The threshold voltage can be set according to actual conditions, and the present application does not make specific limitation thereto, for example, the threshold voltage is set to 5V. The voltage detection circuit 102 controls the on and off of the charging circuit 101 by detecting the charging voltage, which can accurately charge and stop charging the oscillation circuit, and there is no closed loop stability problem, and no loop gain is needed, so that the capacitance and resistance are saved, and the chip cost is saved.

[0032] Please refer to Figure 2 , Figure 2 The circuit schematic diagram of another embodiment of the non-magnetic meter control circuit provided by the embodiment of the present application is shown in the figure.

[0033] In some embodiments, as Figure 2 shown, the non-magnetic meter control circuit 100 further comprises a digital control circuit 105, and the voltage detection circuit 102 is connected to the digital control circuit 105.

[0034] For example, the voltage detection circuit 102 sends a first electric signal to the digital control circuit 105 when the charging voltage of the oscillation circuit 200 reaches the threshold voltage, wherein the first electric signal is used to inform the digital control circuit 105 that the charging is completed.

[0035] In some embodiments, the charging circuit 101 is further connected to the digital control circuit 105, and the digital control circuit 105 can lock the charging circuit 101 to stop charging the oscillation circuit 200 according to the first electric signal.

[0036] In some embodiments, as Figure 2As shown, the charging circuit 101 includes a first controlled switch 1011, which is connected between the first power supply and the first port 103. The controlled terminal of the first controlled switch 1011 is connected to the voltage detection circuit 102 and can be controlled to connect or disconnect by the voltage detection circuit 102. The first controlled switch 1011 can be selected according to actual conditions, and this application does not impose specific limitations on it. For example, the first controlled switch 1011 can be a MOSFET.

[0037] For example, the first controlled switch 1011 is turned on according to the second electrical signal output by the voltage detection circuit 102 to charge the oscillation circuit 200, and the first controlled switch 1011 is turned off according to the first electrical signal output by the voltage detection circuit 102 to stop charging the oscillation circuit 200. By controlling the first controlled switch 1011 to be turned on or off, it is possible to accurately control whether the charging circuit 101 charges the oscillation circuit 200.

[0038] In some embodiments, the first electrical signal is a low-level signal and the second electrical signal is a high-level signal.

[0039] In some embodiments, such as Figure 2 As shown, the control circuit 100 of the non-magnetic meter includes a second controlled switch 106. One end of the second controlled switch 106 is connected to a second power supply, and the other end is connected to a charging circuit 101. The controlled end of the second controlled switch 106 is connected to a digital control circuit 105 and can be controlled to be turned on or off by the digital control circuit 105. The second controlled switch 106 can be selected according to actual conditions, and this application does not impose specific limitations on it. For example, the second controlled switch 106 can be a MOSFET or a transistor.

[0040] For example, when charging the oscillation circuit 200, the voltage detection circuit 102 outputs a second electrical signal. The digital control circuit 105 controls the second controlled switch 106 to open according to the second electrical signal output by the voltage detection circuit 102, so that the controlled terminal of the first controlled switch 1011 is disconnected from the second power supply, thereby charging the oscillation circuit 200. By controlling the second controlled switch 106 to open, the first controlled switch 1011 is turned on, thereby achieving the purpose of charging the oscillation circuit 200.

[0041] For example, when charging of the oscillation circuit 200 stops, the voltage detection circuit 102 outputs a first electrical signal. The digital control circuit 105 controls the second controlled switch 106 to turn on according to the first electrical signal output by the voltage detection circuit 102, so that the controlled terminal of the first controlled switch 1011 is connected to the second power supply, thereby locking the non-charging state of the charging circuit 101 through the second power supply. By controlling the second controlled switch 106 to turn on, the non-charging state of the charging circuit 101 is locked through the second power supply.

[0042] In some embodiments, as shown in Figure 2 The voltage detection circuit 102 includes an open-loop operational amplifier circuit 1021, an input terminal of the open-loop operational amplifier circuit 1021 is connected to the first port 103, and an output terminal of the open-loop operational amplifier circuit 1021 is connected to the charging circuit 101. The open-loop operational amplifier circuit 1021 can be selected according to actual conditions, and the present application does not make specific limitations thereto. For example, the open-loop operational amplifier circuit 1021 can be a comparator.

[0043] For example, when the voltage at the first port 103 does not reach the threshold voltage, the open-loop operational amplifier circuit 1021 controls the charging circuit 101 to charge the oscillation circuit 200, and when the voltage at the first port 103 reaches the threshold voltage, the open-loop operational amplifier circuit 1021 controls the charging circuit 101 to stop charging the oscillation circuit 200. By detecting the charging voltage through the open-loop operational amplifier circuit 1021, there is no closed-loop stability problem, and the loop gain is not required, so that the capacitor and the resistor are saved, and the chip cost is saved.

[0044] For example, when the oscillation circuit 200 is not charged, the charging voltage is 0V, the input voltage of the open-loop operational amplifier circuit 1021 is less than the threshold voltage, so that the open-loop operational amplifier circuit 1021 outputs a second electric signal, and the charging circuit 101 charges the oscillation circuit 200 according to the second electric signal output by the open-loop operational amplifier circuit 1021. The charging current generated by the charging circuit 101 flows to the oscillation circuit 200 through the first port 103, and when the charging voltage of the oscillation circuit 200 reaches the threshold voltage, the open-loop operational amplifier circuit 1021 outputs a first electric signal, and the charging circuit 101 stops charging the oscillation circuit 200 according to the first electric signal output by the open-loop operational amplifier circuit 1021. By controlling the charging circuit 101 whether to charge the oscillation circuit 200 through the signal output by the open-loop operational amplifier circuit 1021, the occurrence of the ringing phenomenon is avoided, and the accuracy of the charging control is improved.

[0045] In some embodiments, the output terminal of the open-loop operational amplifier circuit 1021 is also connected to the digital control circuit 105, and when the voltage at the first port 103 reaches the threshold voltage, a first electric signal is sent to the digital control circuit 105, wherein the first electric signal is used to inform the digital control circuit 105 that the charging is completed.

[0046] In some embodiments, another input terminal of the open-loop operational amplifier circuit 1021 is connected to the threshold voltage, which can be directly set in the open-loop operational amplifier circuit 1021 according to actual conditions.

[0047] In some embodiments, the non-magnetic meter control circuit 100 further comprises a reference voltage circuit connected to the threshold voltage input of the open-loop operational amplifier circuit 1021. The reference voltage circuit can be selected according to actual conditions, which is not limited in the present application. For example, the reference voltage circuit can be a voltage digital-to-analog converter. In other embodiments, the reference voltage circuit is connected between the threshold voltage input of the open-loop operational amplifier circuit 1021 and the digital control circuit 105.

[0048] For example, the reference voltage circuit provides a threshold voltage V to an input of the open-loop operational amplifier circuit 1021, or the digital control circuit 105 controls the reference voltage circuit to provide a threshold voltage V to an input of the open-loop operational amplifier circuit 1021. The reference voltage circuit can flexibly adjust the threshold voltage, improving the accuracy of the control voltage detection circuit 102.

[0049] In some embodiments, as shown in Figure 2 The non-magnetic meter control circuit 100 further comprises a discharge control circuit 107 connected between the second port 104 and the digital control circuit 105, and an oscillation detection circuit 108 connected between the second port 104 and the digital control circuit 105.

[0050] For example, the digital control circuit 105 controls the discharge control circuit 107 to ground the second port 104, so that the oscillation circuit 200 outputs an oscillation signal to the second port 104, and the oscillation detection circuit 108 receives the oscillation signal transmitted by the second port 104 and outputs the number of oscillations according to the voltage amplitude of the oscillation signal.

[0051] In some embodiments, the digital control circuit 105 controls the discharge control circuit 107 to connect the second port 104 and the ground, so that the second port 104 is grounded, and the oscillation circuit 200 outputs an oscillation signal to the second port 104, and the number of digital pulses is determined according to the oscillation signal. After obtaining the number of digital pulses, the reading of the non-magnetic meter is determined according to the number of digital pulses. The circuit can accurately determine the reading of the non-magnetic meter.

[0052] In some embodiments, the number of digital pulses is used to determine the speed of oscillation decay of the oscillation circuit 200, and the speed of oscillation decay is used to determine which area of the dial is currently turned to, and the speed of area switching is used to determine the speed of the dial rotation, and the speed of the dial rotation is used to determine the reading of the non-magnetic meter.

[0053] In some embodiments, when the oscillation circuit 200 generates an oscillation signal, the oscillation detection circuit 108 receives the oscillation signal transmitted by the second port 104, and outputs an oscillation number according to the voltage amplitude of the oscillation signal, so that the digital control circuit 105 determines the reading of the non-magnetic meter according to the oscillation number. By counting the oscillation signal through the oscillation detection circuit 108, the accuracy of the non-magnetic meter measurement is improved.

[0054] In some embodiments, the oscillation detection circuit 108 is connected between the second port 104 and the digital control circuit 104, and the oscillation detection circuit 108 can include a digital counting circuit connected between the second port 104 and the digital control circuit 105. The digital counting circuit can be selected according to actual conditions, which is not limited in the present application.

[0055] For example, when the discharge control circuit 107 connects the second port 104 with the ground, the oscillation circuit 200 generates an oscillation signal and transmits it to the digital counting circuit through the second port 104. The digital counting circuit outputs a digital pulse signal according to the size relationship between the voltage amplitude of the oscillation signal and the detection threshold, and sends the digital pulse signal to the digital control circuit 105, so that the digital control circuit 105 counts the number of digital pulses according to the digital pulse signal, and determines the reading of the non-magnetic meter according to the number of digital pulses. The detection threshold can be set according to actual conditions, which is not limited in the present application. For example, the detection threshold can be set to 5V. The digital counting circuit can accurately output the digital pulse signal, thereby improving the reading accuracy of the non-magnetic meter.

[0056] In some embodiments, the non-magnetic meter control circuit 100 further includes a reference voltage circuit connected to the open-loop operational amplifier circuit 1021 and the oscillation detection circuit 108. The selection of the reference voltage circuit can be selected according to actual conditions, which is not limited in the present application. For example, the reference voltage circuit can be a voltage digital-to-analog converter.

[0057] For example, the reference voltage circuit is used to provide a threshold voltage for the open-loop operational amplifier circuit 1021, and the reference voltage circuit is also used to provide a detection threshold for the oscillation detection circuit 108. It should be noted that the threshold voltage and the detection threshold can be equal or not equal.

[0058] In some embodiments, the discharge control circuit 107 includes a third controlled switch S2 controlled by the digital control circuit 105. The digital control circuit 105 controls the third controlled switch S2 to be conductive, so that the second port 104 is grounded, and the oscillation circuit 200 generates an oscillation and outputs an oscillation signal to the second port 104. By controlling the oscillation circuit to generate an oscillation through the third controlled switch S2, the entire circuit is simplified, and the manufacturing cost is reduced.

[0059] In some embodiments, as shown in FIG. 1A, the non-magnetic meter control circuit 100 further comprises an analog selection channel circuit 109 and a plurality of second ports 104, which are connected to the first ports 103 one by one through a plurality of oscillation loops. Figure 3

[0060] Specifically, the digital control circuit 105 can control the analog selection channel circuit 109 to connect the discharge control circuit 107 and at least one of the plurality of second ports 104, and control the discharge control circuit 107 to ground the at least one second port 104, so that the oscillation loop connected to the at least one second port 104 outputs an oscillation signal to the second port 104. By connecting a plurality of oscillation loops through the analog selection channel circuit 109, the flexibility of the non-magnetic meter measurement is improved.

[0061] The non-magnetic meter control circuit described in the above embodiments controls the charging circuit to be connected to charge the oscillation circuit by the first power supply when the voltage detection circuit detects that the charging voltage of the oscillation circuit does not reach the threshold voltage, and controls the charging circuit to be disconnected to stop charging the oscillation circuit by the first power supply when the voltage detection circuit detects that the charging voltage of the oscillation circuit reaches the threshold voltage. By detecting the charging voltage, the voltage detection circuit controls the on and off of the charging circuit, which can accurately charge and stop charging the oscillation circuit, and there is no closed-loop stability problem, and no loop gain is needed, so the capacitor and resistor are saved, and the chip cost is saved.

[0062] In some embodiments, as shown in FIG. 1A, the non-magnetic meter control circuit 100 further comprises an analog selection channel circuit 109 and a plurality of second ports 104, which are connected to the first ports 103 one by one through a plurality of oscillation loops. Figure 1 Figure 2 Figure 3 In some embodiments, as shown in FIG. 1A, the non-magnetic meter control circuit 100 further comprises an analog selection channel circuit 109 and a plurality of second ports 104, which are connected to the first ports 103 one by one through a plurality of oscillation loops.

[0063] In some embodiments, the non-magnetic meter control circuit 100 charges the oscillation circuit 200, and stops charging the oscillation circuit 200 when the charging voltage of the oscillation circuit 200 reaches the threshold voltage. The oscillation circuit 200 generates an oscillation, and the generated oscillation signal is input to the non-magnetic meter control circuit 100 through the second port 104, so that the non-magnetic meter control circuit 100 determines the number of digital pulses according to the oscillation signal, and determines the reading of the non-magnetic meter according to the number of digital pulses. The reading of the non-magnetic meter can be accurately determined by the non-magnetic meter circuit.

[0064] ​​​It should be noted that, for the convenience and brevity of description, the above description of the specific working process of the non-magnetic meter control circuit 100 can refer to the corresponding process in the foregoing non-magnetic meter control circuit embodiments, which will not be described here.

[0065] In some embodiments, as shown in Figure 2 or Figure 3 The oscillation circuit 200 includes a first capacitor 201 and an oscillation loop 202, which includes a second capacitor 2022 and a first inductor 2021. One end of the first capacitor 201 is connected to the first port 103, and the other end is grounded; the second capacitor 2022 and the first inductor 2021 are connected in parallel, and one end is connected to the first port 103 and the other end is connected to the second port 104.

[0066] For example, the non-magnetic meter control circuit 100 charges the first capacitor 201, stops charging the first capacitor 201 when the charging voltage reaches the threshold voltage, and controls the oscillation loop 202 to be connected to the second port 104 and grounded, so that the oscillation loop 202 outputs an oscillation signal to the second port 104. The oscillation loop 202 can accurately output an oscillation signal.

[0067] The non-magnetic meter circuit described in the above embodiments can accurately determine the reading of the non-magnetic meter, greatly improving the measurement accuracy.

[0068] Please refer to Figure 4 , Figure 4 A structure diagram of a non-magnetic meter control chip provided by the embodiment of the present application.

[0069] As shown in Figure 4 The non-magnetic meter control chip 300 includes a non-magnetic meter control circuit 310, which includes a digital control circuit 311, a charging circuit 312, a voltage detection circuit 313, a discharge control circuit 314, a first port 315 and a second port 316.

[0070] It should be noted that, for the convenience and brevity of description, the above description of the specific working process of the non-magnetic meter control chip 300 can refer to the corresponding process in the foregoing non-magnetic meter control circuit and non-magnetic meter circuit embodiments, which will not be described here.

[0071] The above non-magnetic meter control chip uses an operational amplifier circuit and does not have a ringing phenomenon, solves the problem of closed-loop stability, does not require loop gain, saves the use of large-area resistors and capacitors, and thus saves the cost of the chip.

[0072] Please refer to the foregoing embodimentsFigure 5 , Figure 5 A structure schematic diagram of the non-magnetic meter provided by the embodiment of the present application is shown.

[0073] As shown in Figure 5 , the non-magnetic meter 400 comprises:

[0074] an oscillation circuit 410;

[0075] a non-magnetic meter control circuit 420;

[0076] a dial 430, which comprises an impeller, and a side surface of the impeller comprises a metal area and a non-metal area;

[0077] The oscillation circuit is arranged close to the side surface of the impeller, and the oscillation circuit is connected to the non-magnetic meter control circuit.

[0078] Specifically, the oscillation circuit 410 is connected to the non-magnetic meter control circuit 420, which charges the oscillation circuit 410, and when the impeller of the dial 430 rotates, the oscillation circuit 410 arranged close to the side surface of the impeller generates an oscillation signal and outputs the oscillation signal to the non-magnetic meter control circuit 420, so that the non-magnetic meter control circuit 420 determines the reading of the non-magnetic meter according to the oscillation signal.

[0079] In some embodiments, the non-magnetic meter can be a non-magnetic water meter.

[0080] The non-magnetic meter control circuit provided by the embodiment of the present application is made into a non-magnetic meter with less components, low cost and high measurement accuracy, so as to improve the measurement accuracy.

[0081] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be a mechanical connection, or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0082] In the present application, unless specifically defined otherwise, the expression "on" or "under" of a first feature with respect to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the expression "on", "above" and "over" of a first feature with respect to a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The expression "under", "below" and "underneath" of a first feature with respect to a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0083] The above disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described in the above. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0084] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The above embodiments are only preferred embodiments of the present application, and cannot limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A non-magnetic meter control circuit, characterized by, The non-magnetic meter control circuit comprises a first port and a second port for connecting an oscillation circuit, a charging circuit and a voltage detection circuit; The charging circuit is connected between a first power supply and the first port, and the first port is also connected to an input end of the voltage detection circuit, and an output end of the voltage detection circuit is connected to the charging circuit; The non-magnetic meter control circuit further comprises a digital control circuit, the voltage detection circuit is connected to the digital control circuit, and the non-magnetic meter control circuit comprises a second controlled switch, one end of the second controlled switch is connected to a second power supply, and the other end is connected to the charging circuit, and a control end of the second controlled switch is connected to the digital control circuit; The voltage detection circuit comprises an open-loop operational amplifier circuit, an input end of the open-loop operational amplifier circuit is connected to the first port, and an output end of the open-loop operational amplifier circuit is connected to the charging circuit; When the charging voltage of the oscillation circuit does not reach a threshold voltage, the voltage detection circuit controls the charging circuit to be connected to enable the first power supply to charge the oscillation circuit; when the charging voltage of the oscillation circuit reaches the threshold voltage, the voltage detection circuit controls the charging circuit to be disconnected to enable the first power supply to stop charging the oscillation circuit; When the oscillation circuit is charged, the second controlled switch is used to be disconnected according to a second electric signal of the digital control circuit; when the oscillation circuit is stopped being charged, the second controlled switch is used to be turned on according to a first electric signal of the digital control circuit to lock a non-charging state of the charging circuit through the second power supply.

2. The non-magnetic meter control circuit of claim 1, wherein When the charging voltage of the oscillation circuit reaches the threshold voltage, the voltage detection circuit sends a first electric signal to the digital control circuit, and the first electric signal is used to inform the digital control circuit that the charging is completed.

3. The non-magnetic meter control circuit of claim 2, wherein, The charging circuit is also connected to the digital control circuit, and the digital control circuit can lock the charging circuit to stop charging the oscillation circuit according to the first electric signal.

4. The non-magnetic meter control circuit of any of claims 1-3, wherein, The charging circuit comprises a first controlled switch, the first controlled switch is connected between the first power supply and the first port, and a control end of the first controlled switch is connected to the voltage detection circuit and can be controlled to be connected or disconnected by the voltage detection circuit.

5. The non-magnetic meter control circuit of any one of claims 1-3, wherein, The open-loop operational amplifier circuit controls the charging circuit to charge the oscillation circuit when the voltage of the first port does not reach the threshold voltage, and controls the charging circuit to stop charging the oscillation circuit when the voltage of the first port reaches the threshold voltage.

6. The non-magnetic meter control circuit of claim 5, wherein, The output end of the open-loop operational amplifier circuit is also connected to the digital control circuit, and a first electric signal is sent to the digital control circuit when the voltage of the first port reaches the threshold voltage, and the first electric signal is used to inform the digital control circuit that the charging is completed.

7. The non-magnetic meter control circuit of any one of claims 1-3, wherein, The non-magnetic meter control circuit further comprises a discharge control circuit connected between the second port and the digital control circuit, and an oscillation detection circuit connected between the second port and the digital control circuit; The digital control circuit controls the discharge control circuit to ground the second port, so that the oscillation circuit outputs an oscillation signal to the second port, and the oscillation detection circuit receives the oscillation signal transmitted by the second port and outputs an oscillation quantity according to the voltage amplitude of the oscillation signal.

8. The non-magnetic meter control circuit of claim 7, wherein, The non-magnetic meter control circuit further comprises an analog selection channel circuit and a plurality of second ports, and the plurality of second ports are connected to the first ports one by one through a plurality of oscillation loops; The digital control circuit can control the analog selection channel circuit to connect the discharge control circuit and at least one of the plurality of second ports, and control the discharge control circuit to ground the at least one second port, so that the oscillation loop connected to the at least one second port outputs an oscillation signal to the second port.

9. A non-magnetic metering scale circuit, characterized by, The non-magnetic meter circuit comprises the non-magnetic meter control circuit according to any one of claims 1-8, and an oscillation circuit connected between the first port and the second port of the non-magnetic meter control circuit.

10. A non-magnetic metering scale control chip, characterized by, The non-magnetic meter control chip comprises the non-magnetic meter control circuit according to any one of claims 1-8.

11. A non-magnetic meter, characterized in that, It comprises: an oscillation circuit; the non-magnetic meter control circuit according to any one of claims 1-8; a dial plate comprising an impeller, one side of the impeller comprising a metal area and a non-metal area; The oscillation circuit is arranged close to the side of the impeller, and the oscillation circuit is connected to the non-magnetic meter control circuit.

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