CN211504445U - Detection circuit - Google Patents
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- CN211504445U CN211504445U CN201920941388.3U CN201920941388U CN211504445U CN 211504445 U CN211504445 U CN 211504445U CN 201920941388 U CN201920941388 U CN 201920941388U CN 211504445 U CN211504445 U CN 211504445U
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Abstract
The utility model relates to the technical field of detection, and provides a detection circuit, which comprises a sampling circuit, a single chip microcomputer and a temperature sensor, wherein the sampling circuit is used for acquiring a voltage signal of the temperature sensor and sending the voltage signal to the single chip microcomputer; the first switch circuit is used for receiving a first control signal output by the singlechip so as to control the working mode of the sampling circuit; the second switch circuit is used for receiving a second control signal output by the singlechip so as to control the working mode of the sampling circuit; when the types of the temperature sensors of different motors are measured, the switch circuit is controlled by the single chip microcomputer to control the sampling circuit to work in a working mode corresponding to the types of the temperature sensors, and compared with the mode that a detection circuit is uniformly used for detecting the temperature of the motors in the prior art, the detection circuit is small in measurement error and good in temperature measurement effect.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a detect technical field, especially relate to a detection circuit.
[ background of the invention ]
The detection circuit detects the temperature of the temperature sensor of the motor, mainly measures the temperature by detecting the resistance change of the temperature sensor, the resistance change of the temperature sensor can cause the change of an electric signal, the temperature of the temperature sensor can be detected by detecting the change of the electric signal, and the temperature of equipment where the temperature sensor is located can be obtained. For example, by detecting the temperature of a temperature sensor in the motor, the temperature of the motor can be obtained.
In the prior art, because the resistance values of different types of temperature sensors have larger difference at different temperatures, a fixed detection circuit is used and the error is reduced through software processing, but the measurement effect is poor, and the temperature error is still larger.
[ Utility model ] content
In order to solve the technical problem, the embodiment of the utility model provides a detection circuitry that temperature measurement effect is better is applied to the motor, the motor includes temperature sensor, the motor is connected with the singlechip, detection circuitry includes:
the sampling circuit is used for acquiring a voltage signal of the temperature sensor and sending the voltage signal to the single chip microcomputer;
the first switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a first control signal output by the singlechip so as to control the working mode of the sampling circuit;
the second switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a second control signal output by the singlechip so as to control the working mode of the sampling circuit;
when the sampling circuit is connected to the temperature sensor, the single chip microcomputer sends a first control signal and a second control signal to the first switch circuit and the second switch circuit according to the type of the temperature sensor so as to control the sampling circuit to work in a working mode corresponding to the type of the temperature sensor and acquire a voltage signal of the temperature sensor in the working mode.
Further, the sampling circuit includes:
the filter circuit is connected with the first switch circuit and is used for filtering the voltage signal;
the voltage division circuit is connected with the filter circuit and is used for forming a voltage division effect with the temperature sensor;
the first amplifying circuit is connected with the filter circuit and is used for amplifying the voltage signal by a preset multiple;
and the second amplifying circuit is connected with the first amplifying circuit, the second switching circuit and the single chip microcomputer, and is used for amplifying the voltage signal by preset times and sending the voltage signal to the single chip microcomputer.
Further, the filter circuit includes:
the common-mode inductor is provided with a first interface at one end of a primary side and a second interface at the other end of the primary side, one end of a secondary side is connected with one end of the first capacitor, and the other end of the secondary side is connected with the other end of the first capacitor;
and one end of the first capacitor is connected with the voltage division circuit and the first switch circuit, and the other end of the first capacitor is grounded.
Further, the voltage dividing circuit includes:
and one end of the first resistor is connected with a forward voltage, and the other end of the first resistor is connected with one end of the first capacitor.
Further, the first amplification circuit includes:
one end of the second resistor is connected with one end of the first capacitor, and the other end of the second resistor is connected with the positive end of the first amplifier;
the negative end of the first amplifier is connected with the other end of the third resistor, and the output end of the first amplifier is connected with the second amplifying circuit;
one end of the third resistor is connected with the other end of the first capacitor, and the other end of the third resistor is connected with one end of the fourth resistor;
one end of the fourth resistor is connected with one end of the second capacitor, and the other end of the fourth resistor is connected with the output end of the first amplifier;
and the other end of the second capacitor is connected with the other end of the fourth resistor.
Further, the second amplification circuit includes:
the positive end of the second amplifier is connected with the output end of the first amplifier, the negative end of the second amplifier is connected with one end of the fifth resistor, and the output end of the second amplifier is connected with one end of the seventh resistor;
one end of the fifth resistor is connected with one end of the sixth resistor, and the other end of the fifth resistor is connected with the second switch circuit;
one end of the sixth resistor is connected with one end of the third capacitor, and the other end of the sixth resistor is connected with the other end of the seventh resistor;
the other end of the third capacitor is connected with the other end of the seventh resistor;
and the other end of the seventh resistor is connected to an input port of the singlechip.
Further, the first switching circuit includes:
one end of the first triode is connected with the other end of the eighth resistor, the other end of the first triode is grounded, and the control end of the first triode is connected with the other end of the ninth resistor;
one end of the eighth resistor is connected with the other end of the first resistor;
and one end of the ninth resistor is connected to the first input port of the singlechip.
Further, the first switch circuit further includes:
one end of the tenth resistor is connected with one end of the ninth resistor, and the other end of the tenth resistor is connected with the other end of the fourth capacitor;
and one end of the fourth capacitor is connected with the control end of the first triode, and the other end of the fourth capacitor is connected with the other end of the first triode.
Further, the second switching circuit includes:
one end of the second triode is connected with the other end of the fifth resistor, the other end of the second triode is grounded, and the control end of the second triode is connected with the other end of the eleventh resistor;
and one end of the eleventh resistor is connected to the second input port of the singlechip.
Further, the second switching circuit further includes:
one end of the twelfth resistor is connected with one end of the first resistor, and the other end of the twelfth resistor is connected with the other end of the fifth capacitor;
and one end of the fifth capacitor is connected with the control end of the second triode, and the other end of the fifth capacitor is connected with the other end of the second triode.
The utility model has the advantages that: the embodiment of the utility model provides a detection circuit, detection circuit includes sampling circuit for acquire temperature sensor's voltage signal and send to the singlechip; the first switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a first control signal output by the singlechip so as to control the working mode of the sampling circuit; the second switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a second control signal output by the singlechip so as to control the working mode of the sampling circuit; when the sampling circuit is connected to the temperature sensor, the single chip microcomputer sends a first control signal and a second control signal to the first switch circuit and the second switch circuit according to the type of the temperature sensor so as to control the sampling circuit to work in a working mode corresponding to the type of the temperature sensor and acquire a voltage signal of the temperature sensor in the working mode. Compared with the prior art in which a detection circuit is uniformly used for detecting the temperature of the motor, the detection circuit has the advantages of smaller measurement error and better temperature measurement effect.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sampling circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a detection circuit according to an embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Please refer to fig. 1, which is a schematic structural diagram of a detection circuit according to an embodiment of the present invention. As shown in fig. 1, the detection circuit 100 is applied to a motor, the motor includes a temperature sensor, the motor is connected to a single chip, and the detection circuit 100 includes:
the sampling circuit 10 is used for acquiring a voltage signal of the temperature sensor and sending the voltage signal to the single chip microcomputer;
the first switch circuit 20 is connected with the sampling circuit and the single chip microcomputer, and is used for receiving a first control signal output by the single chip microcomputer so as to control the working mode of the sampling circuit;
the second switch circuit 30 is connected with the sampling circuit and the single chip microcomputer, and is used for receiving a second control signal output by the single chip microcomputer so as to control the working mode of the sampling circuit;
when the sampling circuit 10 is connected to a temperature sensor, the single chip microcomputer sends a first control signal and a second control signal to the first switch circuit 20 and the second switch circuit 30 according to the type of the temperature sensor, so as to control the sampling circuit 10 to work in a working mode corresponding to the type of the temperature sensor, obtain a voltage signal of the temperature sensor in the working mode, and obtain the temperature of the motor according to the voltage signal.
The sampling circuit 10 comprises a first interface and a second interface of a temperature sensor of an external motor, when the temperature sensor is connected to the first interface and the second interface, the sampling circuit 10 acquires a voltage signal of the temperature sensor, processes the voltage signal, and sends the processed voltage signal to the single chip microcomputer. Because the resistance value of the temperature sensor can change along with the temperature, and the change of the resistance value can cause the change of the voltage signal, the temperature of the temperature sensor can be obtained by measuring the electric signal of the temperature sensor, and then the temperature of the motor where the temperature sensor is located is obtained.
The sampling circuit 10 includes at least one operating mode, and the operating mode is to form different circuit structures according to the switching commands sent by the first switching circuit 20 and the second switching circuit 30 to process the voltage signal of the temperature sensor.
The first switch circuit 20 is configured to receive a first control signal sent by the single chip, and control the sampling circuit to operate in different operating modes according to the control signal. Preferably, the first control signal includes a high level and a low level.
The second switch circuit 30 is configured to receive a second control signal sent by the single chip, and control the sampling circuit to operate in different operating modes according to the control signal. Preferably, the second control signal includes a high level and a low level. Preferably, the first control signal includes a high level and a low level.
It should be noted that the operation mode of the sampling circuit 10 is controlled by the first control signal and the second control signal. For example, when the first control signal is at a high level and the second control signal is at a low level, the operating mode of the sampling circuit 10 is the first operating mode, and when the first control signal is at a low level and the second control signal is at a high level, the operating mode of the sampling circuit 10 is the second operating mode.
In addition, the circuit parameters of the sampling circuits in different working modes are different, and the circuit parameters can be set according to different user requirements.
Specifically, the sampling circuit 10 includes:
a filter circuit 11 connected to the first switch circuit 20 for filtering the voltage signal;
the voltage division circuit 12 is connected with the filter circuit and the first switch circuit 11 and is used for forming a voltage division effect with the temperature sensor;
the first amplifying circuit 13 is connected with the filter circuit 11 and is used for amplifying the voltage signal by a preset multiple;
and the second amplifying circuit 14 is connected with the first amplifying circuit 13, the second switching circuit 30 and the single chip microcomputer, and is used for amplifying the voltage signal by a preset multiple and sending the voltage signal to the single chip microcomputer.
The filter circuit 11 filters the impurity signal of the voltage signal, that is, performs filtering processing. Preferably, the filter circuit 11 may be composed of an inductor and a capacitor.
The voltage dividing circuit 12 is configured to divide the voltage with the temperature sensor to control the voltage of the electrical signal. Preferably, the voltage dividing circuit 12 may be composed of a resistor. The voltage divider circuit 12 is controlled by a switching signal of the first switching circuit 20.
After the first amplifying circuit 13 receives the voltage signal, the voltage signal is amplified to a voltage signal with a preset multiple, where the preset multiple can be determined by a circuit parameter of the first amplifying circuit 13, and the preset multiple can be defined by a user according to a requirement of the user.
The second amplifying circuit 14 is connected to the second switching circuit 30, and a follower or an amplifying circuit can be formed according to a switching signal of the second switching circuit 30, and when the amplifying circuit is formed, the electric signal is amplified by a preset multiple and then sent to the single chip microcomputer.
Specifically, the filter circuit 11 includes:
the common-mode inductor L is provided with a first interface A at one end of a primary side, a second interface B at the other end of the primary side, one end of a secondary side is connected with one end of a first capacitor C1, and the other end of the secondary side is connected with the other end of a first capacitor C1;
the first capacitor C1 has one end connected to the voltage divider 12 and the first switch circuit 20, and the other end grounded.
The common-mode inductor L is used for filtering an electromagnetic interference signal in a voltage signal, and the first capacitor C1 filters the electrical signal.
Specifically, the voltage dividing circuit 12 includes:
and one end of the first resistor R1 is connected to the forward voltage VCC, and the other end of the first resistor R1 is connected with one end of the first capacitor C1.
Specifically, the first amplification circuit 13 includes:
a second resistor R2, one end of which is connected to one end of the first capacitor and the other end of which is connected to the positive input end of the first amplifier;
the inverting input end of the first amplifier U1 is connected with the other end of the third resistor R3, and the output end of the first amplifier U1 is connected with the second amplifying circuit U2;
a third resistor R3 having one end connected to the other end of the first capacitor C1 and the other end connected to one end of a fourth resistor R4;
one end of the fourth resistor R4 is connected with one end of the second capacitor C2, and the other end of the fourth resistor R4 is connected with the output end of the first amplifier U1;
and the other end of the second capacitor C2 is connected with the other end of the fourth resistor R4.
The power supply terminal of the first amplifier U1 is connected to one end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is grounded.
The first amplifier U1, the third resistor R3, the fourth resistor R4 and the second capacitor C2 form an amplifying circuit, and the amplifying circuit amplifies the electric signal by a preset multiple, wherein the preset multiple is (R3+ R4)/R3. In other words, the user can adjust the resistances of R3 and R4, thereby adjusting the magnification.
Specifically, the second amplification circuit 14 includes:
a forward input end of the second amplifier U2 is connected with an output end of the first amplifier U1, a reverse input end of the second amplifier U2 is connected with one end of a fifth resistor R5, and an output end of the second amplifier U2 is connected with one end of a seventh resistor R7;
a fifth resistor R5 having one end connected to one end of the sixth resistor R6 and the other end connected to the second switch circuit 30;
a sixth resistor R6 having one end connected to one end of the third capacitor C3 and the other end connected to the other end of the seventh resistor R7;
the other end of the third capacitor C3 is connected with the other end of the seventh resistor R7;
and the other end of the seventh resistor R7 is connected to an input port Vin of the singlechip.
When the second switch circuit 30 is in an on state, the second amplifier U2, the sixth resistor R6, the third capacitor C3, and the seventh resistor R7 form an amplifying circuit, which amplifies the electrical signal by a preset factor, where the preset factor is (R5+ R6)/R5. In other words, the user can adjust the resistances of R5 and R6, thereby adjusting the magnification.
When the second switch circuit 30 is in an off state, the second amplifier U2, the sixth resistor R6, the third capacitor C3, and the seventh resistor R7 form a voltage follower, and process the voltage signal and send the processed voltage signal to an input port of the single chip.
Specifically, the first switch circuit 20 includes:
one end of the first triode Q1 is connected with the other end of the eighth resistor R8, the other end of the first triode Q1 is grounded, and the control end of the first triode Q1 is connected with the other end of the ninth resistor R9;
an eighth resistor R8, one end of which is connected with the other end of the first resistor R1;
and one end of the ninth resistor R9 is connected to the first output port Vout1 of the singlechip.
Wherein the first switch circuit 20 further comprises:
a tenth resistor R10 having one end connected to one end of the ninth resistor R9 and the other end connected to the other end of the fourth capacitor C4;
one end of the fourth capacitor C4 is connected to the control end of the first transistor Q1, and the other end is connected to the other end of the first transistor Q1.
Wherein, R10 is a pull-down resistor, and C4 is a filter capacitor, which prevents the first triode Q1 from being turned on by mistake.
The first output port Vout1 of the single chip microcomputer is used for outputting a first control signal.
Specifically, the second switch circuit 30 includes:
one end of the second triode Q2 is connected with the other end of the fifth resistor R5, the other end of the second triode Q2 is grounded, and the control end of the second triode Q2 is connected with the other end of the eleventh resistor R11;
one end of the eleventh resistor R11 is connected to the second output port Vout2 of the single chip microcomputer.
Specifically, the second switch circuit 30 further includes:
a twelfth resistor R12, one end of which is connected to one end of the eleventh resistor R11, and the other end of which is connected to the other end of the fifth capacitor;
and one end of the fifth capacitor C4 is connected with the control end of the second triode, and the other end of the fifth capacitor C4 is connected with the other end of the second triode.
Wherein, R12 is a pull-down resistor, and C5 is a filter capacitor, which prevents the second triode Q2 from being turned on by mistake.
And a second output port Vout2 of the singlechip is used for outputting a second control signal.
For example, the detection circuit is used for detecting the temperature of temperature sensors with the models of PT100, PT1000, NTC and KTY 84. The resistance values of the temperature sensors of the types PT100, PT1000, NTC and KTY84 have larger difference at different temperatures. The first control signal is at a high level or a low level, and the second control signal is at a high level or a low level.
When the sensor is PT100, the first control signal output by the single chip microcomputer is low level, the second control signal is high level, the first triode Q1 is in off state, the second triode Q2 is in on state, the first resistor R1 and the temperature sensor form voltage division, simultaneously, the voltage signal of the temperature sensor is filtered by the common mode inductor L and the first capacitor C1, and then amplified by the amplification circuit composed of the first amplifier U1, the third resistor R3, the fourth resistor R4 and the second capacitor C2 (preset multiple of R3+ R4)/R3), and finally, because the second triode Q2 is in on state, the amplified electric signal is amplified by the amplification circuit formed by the second amplifier U2, the sixth resistor R6, the third capacitor C3 and the seventh resistor R7 (preset multiple of R5+ R6)/R5, and finally output to the single chip microcomputer, and the single chip microcomputer calculates the temperature of the temperature sensor according to the finally output voltage signal, so that the temperature of the motor is obtained.
When the sensor is PT1000, the first control signal output by the single chip microcomputer is low level, the second control signal is low level, the first triode Q1 is in cut-off state, the second triode Q2 is in cut-off state, the first resistor R1 and the temperature sensor form voltage division, meanwhile, the voltage signal of the temperature sensor is filtered by the common mode inductor L and the first capacitor C1, and then amplified by the amplifying circuit composed of the first amplifier U1, the third resistor R3, the fourth resistor R4 and the second capacitor C2 (preset multiple of R3+ R4)/R3), and finally, because the second triode Q2 is in cut-off state, the amplified electrical signal is processed by the follower formed by the second amplifier U2, the sixth resistor R6, the third capacitor C3 and the seventh resistor R7, and finally output to the single chip microcomputer according to the finally output voltage signal, and calculating the temperature of the temperature sensor so as to obtain the temperature of the motor.
When the sensor is an NTC, a first control signal output by the single chip microcomputer is at a high level, a second control signal is at a low level, the first triode Q1 is in a conducting state, the second triode Q2 is in a blocking state, the temperature sensor is connected in parallel with an eighth resistor R8 and connected in series with a first resistor R1 to form a voltage division, meanwhile, a voltage signal of the temperature sensor is filtered by a common mode inductor L and a first capacitor C1, then amplified by an amplifying circuit consisting of a first amplifier U1, a third resistor R3, a fourth resistor R4 and a second capacitor C2 (a preset multiple of R3+ R4)/R3, and finally, because the second triode Q2 is in the blocking state, the amplified electric signal is processed by a follower formed by a second amplifier U2, a sixth resistor R6, a third capacitor C3 and a seventh resistor R7 and finally output to the single chip, and the single chip microcomputer calculates the temperature of the temperature sensor according to the finally output voltage signal, so that the temperature of the motor is obtained.
When the sensor is KTY84, the first control signal output by the single chip microcomputer is at a high level, the second control signal is at a high level, the first triode Q1 is in a conducting state, the second triode Q2 is in a conducting state, the temperature sensor is connected in parallel with the eighth resistor R8 and connected in series with the first resistor R1 to form a divided voltage, meanwhile, the voltage signal of the temperature sensor is filtered by the common mode inductor L and the first capacitor C1, and then amplified by the amplifying circuit composed of the first amplifier U1, the third resistor R3, the fourth resistor R4 and the second capacitor C2 (a preset multiple of R3+ R4)/R3, and finally, because the second triode Q2 is in a conducting state, the amplified electric signal is amplified by the amplifying circuit formed by the second amplifier U2, the sixth resistor R6, the third capacitor C3 and the seventh resistor R7 (a preset multiple of R5+ R6)/R5 8), and finally, outputting the voltage signal to a single chip, and calculating the temperature of the temperature sensor by the single chip according to the finally output voltage signal so as to obtain the temperature of the motor.
The embodiment of the utility model provides a detection circuit, detection circuit includes sampling circuit for acquire temperature sensor's voltage signal and send to the singlechip; the first switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a first control signal output by the singlechip so as to control the working mode of the sampling circuit; the second switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a second control signal output by the singlechip so as to control the working mode of the sampling circuit; when the sampling circuit is connected to the temperature sensor, the single chip microcomputer sends a first control signal and a second control signal to the first switch circuit and the second switch circuit according to the type of the temperature sensor so as to control the sampling circuit to work in a working mode corresponding to the type of the temperature sensor and acquire a voltage signal of the temperature sensor in the working mode. Compared with the prior art in which a detection circuit is uniformly used for detecting the temperature of the motor, the detection circuit has the advantages of smaller measurement error and better temperature measurement effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. The utility model provides a detection circuitry, is applied to the motor, the motor includes temperature sensor, its characterized in that, the motor is connected with the singlechip, detection circuitry includes:
the sampling circuit is used for acquiring a voltage signal of the temperature sensor and sending the voltage signal to the single chip microcomputer;
the first switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a first control signal output by the singlechip so as to control the working mode of the sampling circuit;
the second switch circuit is connected with the sampling circuit and the singlechip and is used for receiving a second control signal output by the singlechip so as to control the working mode of the sampling circuit;
the sampling circuit includes:
the filter circuit is connected with the first switch circuit and is used for filtering the voltage signal;
the voltage division circuit is connected with the filter circuit and the first switch circuit and is used for forming a voltage division effect with the temperature sensor;
the first amplifying circuit is connected with the filter circuit and is used for amplifying the voltage signal by a preset multiple;
the second amplifying circuit is connected with the first amplifying circuit, the second switching circuit and the single chip microcomputer, and is used for amplifying the voltage signal by a preset multiple and sending the voltage signal to the single chip microcomputer;
when the sampling circuit is connected with the temperature sensor, the single chip microcomputer sends a first control signal and a second control signal to the first switch circuit and the second switch circuit according to the type of the temperature sensor so as to control the sampling circuit to work in a working mode corresponding to the type of the temperature sensor, and obtains a voltage signal of the temperature sensor in the working mode, and then obtains the temperature of the motor according to the voltage signal.
2. The detection circuit of claim 1, wherein the filtering circuit comprises:
the common-mode inductor is provided with a first interface at one end of a primary side and a second interface at the other end of the primary side, one end of a secondary side is connected with one end of the first capacitor, and the other end of the secondary side is connected with the other end of the first capacitor;
and one end of the first capacitor is connected with the voltage division circuit and the first switch circuit, and the other end of the first capacitor is grounded.
3. The detection circuit of claim 2, wherein the voltage divider circuit comprises:
and one end of the first resistor is connected with a forward voltage, and the other end of the first resistor is connected with one end of the first capacitor.
4. The detection circuit of claim 3, wherein the first amplification circuit comprises:
one end of the second resistor is connected with one end of the first capacitor, and the other end of the second resistor is connected with the positive input end of the first amplifier;
the reverse input end of the first amplifier is connected with the other end of the third resistor, and the output end of the first amplifier is connected with the second amplifying circuit;
one end of the third resistor is connected with the other end of the first capacitor, and the other end of the third resistor is connected with one end of the fourth resistor;
one end of the fourth resistor is connected with one end of the second capacitor, and the other end of the fourth resistor is connected with the output end of the first amplifier;
and the other end of the second capacitor is connected with the other end of the fourth resistor.
5. The detection circuit of claim 4, wherein the second amplification circuit comprises:
the positive end of the second amplifier is connected with the output end of the first amplifier, the negative end of the second amplifier is connected with one end of the fifth resistor, and the output end of the second amplifier is connected with one end of the seventh resistor;
one end of the fifth resistor is connected with one end of the sixth resistor, and the other end of the fifth resistor is connected with the second switch circuit;
one end of the sixth resistor is connected with one end of the third capacitor, and the other end of the sixth resistor is connected with the other end of the seventh resistor;
the other end of the third capacitor is connected with the other end of the seventh resistor;
and the other end of the seventh resistor is connected to an input port of the singlechip.
6. The detection circuit of claim 3, wherein the first switching circuit comprises:
one end of the first triode is connected with the other end of the eighth resistor, the other end of the first triode is grounded, and the control end of the first triode is connected with the other end of the ninth resistor;
one end of the eighth resistor is connected with the other end of the first resistor;
and one end of the ninth resistor is connected to the first output port of the singlechip.
7. The detection circuit of claim 6, wherein the first switching circuit further comprises:
one end of the tenth resistor is connected with one end of the ninth resistor, and the other end of the tenth resistor is connected with the other end of the fourth capacitor;
and one end of the fourth capacitor is connected with the control end of the first triode, and the other end of the fourth capacitor is connected with the other end of the first triode.
8. The detection circuit of claim 5, wherein the second switching circuit comprises:
one end of the second triode is connected with the other end of the fifth resistor, the other end of the second triode is grounded, and the control end of the second triode is connected with the other end of the eleventh resistor;
and one end of the eleventh resistor is connected to the second output port of the singlechip.
9. The detection circuit of claim 8, wherein the second switching circuit further comprises:
one end of the twelfth resistor is connected with one end of the eleventh resistor, and the other end of the twelfth resistor is connected with the other end of the fifth capacitor;
and one end of the fifth capacitor is connected with the control end of the second triode, and the other end of the fifth capacitor is connected with the other end of the second triode.
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| CN201920941388.3U CN211504445U (en) | 2019-06-19 | 2019-06-19 | Detection circuit |
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| CN201920941388.3U CN211504445U (en) | 2019-06-19 | 2019-06-19 | Detection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207840A (en) * | 2019-06-19 | 2019-09-06 | 深圳市麦格米特驱动技术有限公司 | A kind of detection circuit |
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2019
- 2019-06-19 CN CN201920941388.3U patent/CN211504445U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207840A (en) * | 2019-06-19 | 2019-09-06 | 深圳市麦格米特驱动技术有限公司 | A kind of detection circuit |
| CN110207840B (en) * | 2019-06-19 | 2024-06-18 | 深圳麦格米特电气股份有限公司 | Detection circuit |
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