CN217689153U - Voltage sampling circuit applied to analog-to-digital converter - Google Patents
Voltage sampling circuit applied to analog-to-digital converter Download PDFInfo
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- CN217689153U CN217689153U CN202221013332.XU CN202221013332U CN217689153U CN 217689153 U CN217689153 U CN 217689153U CN 202221013332 U CN202221013332 U CN 202221013332U CN 217689153 U CN217689153 U CN 217689153U
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Abstract
The utility model provides a be applied to analog-to-digital converter's voltage sampling circuit, including the transformer module, analog-to-digital conversion chip module, a first buffer amplifier module for exporting the direct current magnitude of voltage to analog-to-digital conversion chip module, a voltage source module for outwards exporting first appointed magnitude of voltage, a second buffer amplifier module for carrying out buffering with first appointed magnitude of voltage, a voltage step-down module for with after the buffering of second buffer amplifier module to second appointed magnitude of voltage, a third buffer amplifier module for carrying out the buffering to second appointed magnitude of voltage. The utility model provides a pair of be applied to analog-to-digital converter's voltage sampling circuit has the characteristics that circuit design is simple, convenient the application, is applicable to the incoming signal difference, single-ended thoughtlessly, and the signal processing chip is the circuit system of single-ended input.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a be applied to analog-to-digital converter's voltage sampling circuit.
Background
At present, a differential measurement circuit has the characteristics of simple structure, convenience in use, capability of measuring direct current and ultralow frequency signals, low power consumption and the like, so that the differential measurement circuit is increasingly widely applied to various fields such as household electrical appliance control, industrial equipment, series battery pack detection and the like.
However, in practice, for some signal processing chips, such as AD conversion chips, the input terminal of the device needs to be a unipolar single-ended input signal, so that a conversion circuit is needed to convert a bipolar differential signal into a unipolar single-ended input signal.
Therefore, it is desirable to provide a voltage sampling circuit applied to an analog-to-digital converter to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a be applied to analog-to-digital converter's voltage sampling circuit, has the characteristics that circuit design is simple, convenient to use, is applicable to the incoming signal difference, single-ended thoughtlessly, and the signal processing chip is the circuit system of single-ended input.
In order to solve the technical problem, the utility model discloses a technical scheme provide a be applied to analog-to-digital converter's voltage sampling circuit, including be used for converting the alternating voltage value of input into direct voltage value's transformer module 1, analog-to-digital conversion chip module 2, be used for with direct voltage value exports to analog-to-digital conversion chip module 2's first buffer amplifier module 3, be used for outwards exporting first appointed voltage value the voltage source module 4, be used for with first appointed voltage value carries out the second buffer amplifier module 6 that buffers, be used for with voltage after the buffering of second buffer amplifier module 6 steps down to second appointed voltage value's step-down module 5, is used for right the second appointed voltage carries out the third buffer amplifier module 7 that buffers, one of them output of secondary of transformer module 1 with the output electricity of third buffer amplifier module 7 is connected, another output of secondary with the input electricity of first buffer amplifier module 3 is connected.
In the examples, it is preferred that:
the transformer module 1 comprises a signal input terminal J6, a filter capacitor C90, a filter capacitor C91, a resistor R178 and a resistor R179 for converting an alternating current voltage signal input by the signal input terminal J6 into an alternating current signal, a rectifier transformer TR1 for converting the alternating current signal into a direct current signal, and a resistor R141 for converting the direct current signal into a direct current voltage signal;
the filter capacitor C90 and the filter capacitor C91 are serially connected between the signal output end of the resistor R178 and the signal output end of the resistor R179, the signal output end of the rectifier transformer TR1 is electrically connected to the non-inverting input end of the first buffer amplifier module 3, one end of the resistor R141 is electrically connected between the signal output end of the rectifier transformer TR1 and the non-inverting input end of the first buffer amplifier module 3, and the other end of the resistor R141 is electrically connected to the signal output end of the third buffer amplifier module 7.
In the examples, it is preferred that:
the first buffer amplifier module 3 comprises a buffer amplifier U17A for outputting the dc voltage value to the analog-to-digital conversion chip module 2, a resistor R99 and a capacitor C75 for filtering high-frequency noise, and a diode D5 for preventing the dc voltage value from exceeding the withstand voltage value of the analog-to-digital conversion chip module 2 to protect the analog-to-digital conversion chip module 2;
the non-inverting input end of the buffer amplifier U17A is electrically connected with the transformer module 1 through a resistor R98, the inverting input end of the buffer amplifier U17A is electrically connected with the signal output end of the buffer amplifier U17A, the signal output end of the buffer amplifier U17A is electrically connected with the analog-to-digital conversion chip module 2 through a resistor R99, one end of the capacitor C75 is grounded, the other end of the capacitor C75 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module 2, the cathode of the diode D5 is electrically connected with a circuit power supply, and the anode of the diode D5 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module 2.
In the examples, it is preferred that:
the voltage source module 4 includes a filter capacitor C66 and a shunt reference voltage source chip U20 for outputting the first specified voltage value to the second buffer amplifier module 6, and a power output end of the shunt reference voltage source chip U20 is electrically connected to a non-inverting input end of the second buffer amplifier module 6.
In the examples, it is preferred that:
the voltage reduction module 5 includes a voltage division circuit composed of a resistor R108 and a resistor R110, the resistor R110 is electrically connected between the signal output end of the second buffer amplifier module 6 and the non-inverting input end of the third buffer amplifier module 7, one end of the resistor R108 is grounded, and the other end is electrically connected between the resistor R110 and the non-inverting input end of the third buffer amplifier module 7.
In the examples, it is preferred that:
the second buffer amplifier module 6 includes a buffer amplifier U18A for outputting the first specified voltage value to the voltage reduction module 5, a non-inverting input terminal of the buffer amplifier U18A is electrically connected to the voltage source module 4, and an inverting input terminal of the buffer amplifier U18A is electrically connected to a signal output terminal of the buffer amplifier U18A through a resistor R111 and a resistor R112.
In the examples, it is preferred that:
the third buffer amplifier module 7 comprises a buffer amplifier U18B for outputting the second specified voltage value to the transformer module 1, a resistor R144 and a capacitor C44 for filtering high-frequency noise, a freewheeling diode D35 and a freewheeling diode D36 for preventing a reverse voltage generated by the transformer module 1 from breaking down the buffer amplifier U18B to protect the buffer amplifier U18B;
the non-inverting input end of the buffer amplifier U18B is electrically connected to the signal output end of the voltage-reducing module 5, the inverting input end of the buffer amplifier U18B is electrically connected to the signal output end of the buffer amplifier U18B, the signal output end of the buffer amplifier U18B is electrically connected to the transformer module 1 through the resistor R144, the cathode of the freewheeling diode D35 is electrically connected to a circuit power supply, the anode of the freewheeling diode D36 is electrically connected between the resistor R144 and the transformer module 1, the anode of the freewheeling diode D36 is grounded, the cathode of the freewheeling diode D36 is electrically connected between the resistor R144 and the transformer module 1, one end of the capacitor C44 is electrically connected to the anode of the freewheeling diode D36, and the other end of the capacitor C is electrically connected between the resistor R144 and the transformer module 1.
The utility model has the advantages that: the utility model provides a pair of be applied to analog-to-digital converter's voltage sampling circuit has the characteristics that circuit design is simple, convenient the application, is applicable to the incoming signal difference, single-ended thoughtlessly, and the signal processing chip is the circuit system of single-ended input.
Drawings
Fig. 1 is a schematic block diagram of a circuit structure of a voltage sampling circuit applied to an analog-to-digital converter according to the present invention;
fig. 2 is a schematic circuit diagram of a transformer module and a first buffer amplifier module of another voltage sampling circuit applied to an analog-to-digital converter according to the present invention;
fig. 3 is a schematic circuit diagram of another voltage source module, voltage-reducing module, second buffer amplifier module and third buffer amplifier module of the voltage sampling circuit applied to the analog-to-digital converter of the present invention;
fig. 4 is a schematic circuit diagram of an analog-to-digital conversion chip module of another voltage sampling circuit applied to an analog-to-digital converter according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the drawings.
Referring to fig. 1, the voltage sampling circuit applied to the analog-to-digital converter of the present embodiment includes a transformer module 1 for converting an input ac voltage value into a dc voltage value, an analog-to-digital conversion chip module 2, a first buffer amplifier module 3 for outputting the dc voltage value to the analog-to-digital conversion chip module 2, a voltage source module 4 for outputting a first specified voltage value outwards, a second buffer amplifier module 6 for buffering the first specified voltage value, a voltage dropping module 5 for dropping a voltage buffered by the second buffer amplifier module 6 to a second specified voltage value, and a third buffer amplifier module 7 for buffering the second specified voltage, wherein one output end of a secondary of the transformer module 1 is electrically connected to an output end of the third buffer amplifier module 7, and another output end of the secondary is electrically connected to an input end of the first buffer amplifier module 3.
In this embodiment, when an ac voltage is applied to the transformer module 1, the transformer module 1 can rectify and transform the input voltage to obtain a dc voltage required by the circuit, and at the same time, the voltage source module 4 can output a voltage value of 2.5V to the second buffer amplifier module 6 when it is powered on, and then the voltage reduction module 5 can transform the voltage value of 2.5V to +1.25V, so as to output the voltage value to one of the secondary output terminals of the transformer module 1 through the third buffer amplifier module 7 to provide a dc offset, so as to convert the bipolar sampling signal into a unipolar signal which can be received by the analog-to-digital conversion chip module 2.
In this embodiment, when the third buffer amplifier module 7 adds a voltage reference of 1.25V to one end of the R141 resistor, the dc potential output by the transformer module 1 is raised to 1.25V, so that the positive and negative half-waves of the ac sine wave originally based on 0V are raised to a dc potential of 1.25V, and the whole is shifted to more than 0V, so that the analog-to-digital conversion chip module 2 can directly perform sampling without considering the problem of bipolar signals.
In the present embodiment, the first buffer amplifier module 3, the second buffer amplifier module 6, and the third buffer amplifier module 7 are typically 1: the amplifier of 1, it does not amplify the signal, but plays the role of impedance matching, can reduce signal distortion, anti-interference, can bear the need of the low impedance output of preceding stage voltage amplification and load well.
Referring to fig. 2, in the embodiment of the present invention, it is preferable that:
the transformer module 1 comprises a signal input terminal J6, a filter capacitor C90, a filter capacitor C91, a resistor R178 and a resistor R179 for converting an alternating current voltage signal input by the signal input terminal J6 into an alternating current signal, a rectifier transformer TR1 for converting the alternating current signal into a direct current signal, and a resistor R141 for converting the direct current signal into a direct current voltage signal;
the filter capacitor C90 and the filter capacitor C91 are serially connected between a signal output end of the resistor R178 and a signal output end of the resistor R179, a signal output end of the rectifier transformer TR1 is electrically connected with a non-inverting input end of the first buffer amplifier module 3, one end of the resistor R141 is electrically connected between the signal output end of the rectifier transformer TR1 and the non-inverting input end of the first buffer amplifier module 3, and the other end of the resistor R141 is electrically connected with a signal output end of the third buffer amplifier module 7.
In this embodiment, ac voltage can be input from the signal input terminal J6 through L-line and N-line respectively, after the voltage signal is converted into a current signal through the precision resistors of the resistors R178 and R179, the current signal can be input through the rectifier transformer TR11 and pin 2 to be converted into a current signal of 1:1, and output through the secondary winding 3,4, the resistor R141 is a precision resistor, the current signal can be converted into a voltage signal on the resistor R141, and when a voltage reference is applied to one end of the resistor R141 by the third buffer amplifier module 7, the dc potential output by the rectifier transformer TR11 can be raised, so that the ac sine wave positive and negative polarity half-wave originally based on 0V is shifted to 0V or more as a whole, so that the ADC inside the single chip can directly sample without considering the problem of the signal.
In this embodiment, the signal input terminal J6 may be externally connected with not only a 220V ac voltage or current signal, but also a 380V voltage or current signal, which is not limited in this application.
Referring to fig. 2, in the embodiment of the present invention, it is preferable that:
the first buffer amplifier module 3 comprises a buffer amplifier U17A for outputting a direct current voltage value to the analog-to-digital conversion chip module 2, a resistor R99 and a capacitor C75 for filtering high-frequency noise, and a diode D5 for preventing the direct current voltage value from exceeding a tolerance voltage value of the analog-to-digital conversion chip module 2 to protect the analog-to-digital conversion chip module 2;
the non-inverting input end of the buffer amplifier U17A is electrically connected with the transformer module 1 through a resistor R98, the inverting input end of the buffer amplifier U17A is electrically connected with the signal output end of the buffer amplifier U17A, the signal output end of the buffer amplifier U17A is electrically connected with the analog-to-digital conversion chip module 2 through a resistor R99, one end of the capacitor C75 is grounded, the other end of the capacitor C75 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module 2, the cathode of the diode D5 is electrically connected with a circuit power supply, and the anode of the diode D5 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module 2.
In this embodiment, the buffer amplifier U17A may perform buffering and impedance matching functions, and the low-pass filter formed by the resistor R99 and the capacitor C75 may perform a function of filtering high-frequency noise.
Referring to fig. 3, in the embodiment of the present invention, it is preferable that:
the voltage source module 4 includes a filter capacitor C66 and a shunt reference voltage source chip U20 for outputting a first specified voltage value to the second buffer amplifier module 6, and a power output end of the shunt reference voltage source chip U20 is electrically connected to a non-inverting input end of the second buffer amplifier module 6.
In the present embodiment, the shunt reference voltage source chip U20 can stably output a 2.5V precision voltage source, and after the 5V power voltage is stepped down by R109 and filtered by C66, the shunt reference voltage source chip U20 can be provided with a start-up power voltage, and then the shunt reference voltage source chip U20 can output a 2.5V reference voltage to the second buffer amplifier module 6.
In this embodiment, the shunt reference voltage source chip U20 of the present application is of a model ADR5041, which does not need an external capacitor to provide compensation, and any capacitive load can be used to keep stable, and it does not have a power supply pin in a conventional sense, and it can be regarded as a voltage regulator, and when a +5V voltage series resistor is connected to pin 1 of the shunt reference voltage source chip U20, the shunt reference voltage source chip U20 can be triggered to generate a reference voltage of 2.5V on pin 1, and then the reference voltage is supplied to the non-inverting input terminal of the second buffer amplifier module 6.
Referring to fig. 3, in the embodiment of the present invention, it is preferable that:
the voltage reduction module 5 includes a voltage division circuit composed of a resistor R108 and a resistor R110, the resistor R110 is electrically connected between the signal output terminal of the second buffer amplifier module 6 and the non-inverting input terminal of the third buffer amplifier module 7, one end of the resistor R108 is grounded, and the other end is electrically connected between the resistor R110 and the non-inverting input terminal of the third buffer amplifier module 7.
In this embodiment, when the first specified voltage value is outputted to the voltage dividing circuit composed of the resistor R108 and the resistor R110 through the second buffer amplifier module 6, the resistor R108 and the resistor R110 may reduce the first specified voltage value to a half of the voltage thereof and then output the voltage, for example, when the shunt reference voltage source chip U20 outputs the 2.5V reference voltage through the second buffer amplifier module 6 to the resistor R108 and the resistor R110, the resistor R108 and the resistor R110 may divide the 2.5V reference voltage into 1.25V reference voltage and output the voltage to one of the secondary output terminals of the transformer module 1 through the third buffer amplifier module 7.
Referring to fig. 3, in the embodiment of the present invention, it is preferable that:
the second buffer amplifier module 6 includes a buffer amplifier U18A for outputting the first designated voltage value to the voltage dropping module 5, a non-inverting input terminal of the buffer amplifier U18A is electrically connected to the voltage source module 4, and an inverting input terminal of the buffer amplifier U18A is electrically connected to a signal output terminal of the buffer amplifier U18A through a resistor R111 and a resistor R112.
In this embodiment, when the shunt reference voltage source chip U20 outputs the 2.5V reference voltage to the non-inverting input terminal of the buffer amplifier U18A, the resistor R111 and the resistor R112 may form a follower, so as to raise the input impedance and lower the output impedance.
Referring to fig. 3, in the embodiment of the present invention, it is preferable that:
the third buffer amplifier module 7 comprises a buffer amplifier U18B for outputting a second specified voltage value to the transformer module 1, a resistor R144 and a capacitor C44 for filtering high-frequency noise, a freewheeling diode D35 and a freewheeling diode D36 for preventing a reverse voltage generated by the transformer module 1 from breaking through the buffer amplifier U18B to protect the buffer amplifier U18B;
the non-inverting input end of the buffer amplifier U18B is electrically connected with the signal output end of the voltage reduction module 5, the inverting input end of the buffer amplifier U18B is electrically connected with the signal output end of the buffer amplifier U18B, the signal output end of the buffer amplifier U18B is electrically connected with the transformer module 1 through the resistor R144, the cathode of the freewheeling diode D35 is electrically connected with the circuit power supply, the anode is electrically connected between the resistor R144 and the transformer module 1, the anode of the freewheeling diode D36 is grounded, the cathode is electrically connected between the resistor R144 and the transformer module 1, one end of the capacitor C44 is electrically connected with the anode of the freewheeling diode D36, and the other end is electrically connected between the resistor R144 and the transformer module 1.
In this embodiment, the sampling terminal of the present application uses a differential circuit as a preceding stage sensing part, and outputs a corresponding signal to the analog-to-digital conversion chip module 2 in cooperation with the low-pass filter circuit and the bipolar conversion circuit, so as to satisfy the signal detection function under high common mode voltages of different floating potentials.
In this embodiment, after the buffer amplifier U18B outputs a reference voltage of 1.25V to one of the secondary output terminals of the transformer module 1, at this time, the voltage V = Vi +1.25V may be applied to the non-inverting input terminal of the first buffer amplifier module 3, that is, the dc potential at the non-inverting input terminal of the first buffer amplifier module 3 may be raised by 1.25V, so as to convert the bipolar sampling signal into a unipolar signal that can be received by the analog-to-digital conversion chip module 2.
In this embodiment, the analog-to-digital conversion chip module (2) in this application includes a microcontroller chip with model MK60FX512VLQ15, and the inside of the microcontroller chip has 4 16-bit SAR analog-to-digital converters, 2 12-bit analog-to-digital converters, and 100 general I/O pins, and U1A and U1B shown in the drawings in this application are two independent parts of the same microcontroller chip.
It can be seen that the voltage sampling circuits applied to the analog-to-digital converters described in fig. 1 to fig. 4 have the advantages of relatively simple circuits, good field practicability and the like, and can implement unattended continuous power supply and ensure reliability and safety of power supply.
In addition, by implementing the voltage sampling circuit applied to the analog-to-digital converter described in fig. 1 to 4, the bipolar signal is changed into the unipolar signal by adopting a signal offset method, and the non-linearity and the accuracy error of the signal are not introduced, so that the sampling accuracy and the reliability of the circuit can be improved.
The above is only the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same reason as the protection scope of the present invention.
Claims (7)
1. A voltage sampling circuit applied to an analog-to-digital converter is characterized in that: the transformer module comprises a transformer module (1) used for converting an input alternating current voltage value into a direct current voltage value, an analog-to-digital conversion chip module (2), a first buffer amplifier module (3) used for outputting the direct current voltage value to the analog-to-digital conversion chip module (2), a voltage source module (4) used for outputting a first specified voltage value outwards, a second buffer amplifier module (6) used for buffering the first specified voltage value, a voltage reduction module (5) used for reducing the voltage buffered by the second buffer amplifier module (6) to a second specified voltage value, and a third buffer amplifier module (7) used for buffering the second specified voltage, wherein one secondary output end of the transformer module (1) is electrically connected with an output end of the third buffer amplifier module (7), and the other secondary output end of the transformer module is electrically connected with an input end of the first buffer amplifier module (3).
2. The voltage sampling circuit applied to the analog-to-digital converter according to claim 1, wherein:
the transformer module (1) comprises a signal input terminal J6, a filter capacitor C90, a filter capacitor C91, a resistor R178 and a resistor R179 for converting an alternating current voltage signal input by the signal input terminal J6 into an alternating current signal, a rectifier transformer TR1 for converting the alternating current signal into a direct current signal, and a resistor R141 for converting the direct current signal into a direct current voltage signal;
the filter capacitor C90 and the filter capacitor C91 are arranged in series between a signal output end of the resistor R178 and a signal output end of the resistor R179, a signal output end of the rectifier transformer TR1 is electrically connected with a non-inverting input end of the first buffer amplifier module (3), one end of the resistor R141 is electrically connected between the signal output end of the rectifier transformer TR1 and the non-inverting input end of the first buffer amplifier module (3), and the other end of the resistor R141 is electrically connected with a signal output end of the third buffer amplifier module (7).
3. The voltage sampling circuit applied to the analog-to-digital converter according to claim 1, wherein:
the first buffer amplifier module (3) comprises a buffer amplifier U17A for outputting the direct current voltage value to the analog-to-digital conversion chip module (2), a resistor R99 and a capacitor C75 for filtering high-frequency noise, and a diode D5 for preventing the direct current voltage value from exceeding the tolerance voltage value of the analog-to-digital conversion chip module (2) so as to protect the analog-to-digital conversion chip module (2);
the non-inverting input end of the buffer amplifier U17A is electrically connected with the transformer module (1) through a resistor R98, the inverting input end of the buffer amplifier U17A is electrically connected with the signal output end of the buffer amplifier U17A, the signal output end of the buffer amplifier U17A is electrically connected with the analog-to-digital conversion chip module (2) through a resistor R99, one end of the capacitor C75 is grounded, the other end of the capacitor C75 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module (2), the cathode of the diode D5 is electrically connected with a circuit power supply, and the anode of the diode D5 is electrically connected between the resistor R99 and the signal input end of the analog-to-digital conversion chip module (2).
4. The voltage sampling circuit applied to the analog-to-digital converter according to claim 1, wherein:
the voltage source module (4) comprises a filter capacitor C66 and a shunt reference voltage source chip U20 used for outputting the first specified voltage value to the second buffer amplifier module (6), and the power output end of the shunt reference voltage source chip U20 is electrically connected with the non-inverting input end of the second buffer amplifier module (6).
5. The voltage sampling circuit applied to the analog-to-digital converter according to claim 1, wherein:
the voltage reduction module (5) comprises a voltage division circuit composed of a resistor R108 and a resistor R110, the resistor R110 is electrically connected between the signal output end of the second buffer amplifier module (6) and the non-inverting input end of the third buffer amplifier module (7), one end of the resistor R108 is grounded, and the other end of the resistor R108 is electrically connected between the resistor R110 and the non-inverting input end of the third buffer amplifier module (7).
6. The voltage sampling circuit applied to the analog-to-digital converter according to claim 1, wherein:
the second buffer amplifier module (6) comprises a buffer amplifier U18A for outputting the first specified voltage value to the voltage reduction module (5), the non-inverting input end of the buffer amplifier U18A is electrically connected with the voltage source module (4), and the inverting input end of the buffer amplifier U18A is electrically connected with the signal output end of the buffer amplifier U18A through a resistor R111 and a resistor R112.
7. The voltage sampling circuit applied to the analog-to-digital converter according to any one of claims 1 to 6, wherein:
the third buffer amplifier module (7) comprises a buffer amplifier U18B for outputting the second specified voltage value to the transformer module (1), a resistor R144 and a capacitor C44 for filtering high-frequency noise, a free-wheeling diode D35 and a free-wheeling diode D36 for preventing reverse voltage generated by the transformer module (1) from breaking down the buffer amplifier U18B to protect the buffer amplifier U18B;
the non-inverting input end of the buffer amplifier U18B is electrically connected with the signal output end of the voltage reduction module (5), the inverting input end of the buffer amplifier U18B is electrically connected with the signal output end of the buffer amplifier U18B, the signal output end of the buffer amplifier U18B is electrically connected with the transformer module (1) through the resistor R144, the cathode of the fly-wheel diode D35 is electrically connected with a circuit power supply, the anode of the fly-wheel diode D35 is electrically connected between the resistor R144 and the transformer module (1), the anode of the fly-wheel diode D36 is grounded, the cathode of the fly-wheel diode D36 is electrically connected between the resistor R144 and the transformer module (1), one end of the capacitor C44 is electrically connected with the anode of the fly-wheel diode D36, and the other end of the capacitor C is electrically connected between the resistor R144 and the transformer module (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221013332.XU CN217689153U (en) | 2022-04-26 | 2022-04-26 | Voltage sampling circuit applied to analog-to-digital converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221013332.XU CN217689153U (en) | 2022-04-26 | 2022-04-26 | Voltage sampling circuit applied to analog-to-digital converter |
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| CN217689153U true CN217689153U (en) | 2022-10-28 |
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| CN202221013332.XU Active CN217689153U (en) | 2022-04-26 | 2022-04-26 | Voltage sampling circuit applied to analog-to-digital converter |
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