CN215894768U - Charge amplification device based on resistance type sensor - Google Patents
Charge amplification device based on resistance type sensor Download PDFInfo
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- CN215894768U CN215894768U CN202121805230.7U CN202121805230U CN215894768U CN 215894768 U CN215894768 U CN 215894768U CN 202121805230 U CN202121805230 U CN 202121805230U CN 215894768 U CN215894768 U CN 215894768U
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Abstract
The utility model provides a charge amplification device based on resistance-type sensor, relates to a circuit amplification device, including the control unit, is equipped with AD converting circuit on the control unit's the input, is equipped with amplifier A on AD converting circuit's the input, is equipped with beta value setting circuit on amplifier A's the input, amplifier A's input on be equipped with charge input circuit, be equipped with zero offset compensation circuit on one side of charge input circuit, parallel connection between zero offset compensation circuit and the amplifier A is equipped with harmonic filtering circuit on amplifier A's the output, harmonic filtering circuit is connected with the control unit. The device can be realized by arranging the amplifier A, and the high-impedance characteristic device is beneficial to the installation and use of monitoring points in a large range and has low use cost; a charge input circuit is provided to determine whether the static electricity eliminating effect is good.
Description
Technical Field
The present invention relates to a circuit amplifying device, and more particularly, to a resistance sensor based charge amplifying device.
Background
Electrostatic hazards are caused by electrostatic charges or electrostatic field energy. During the production process and the operation of operators, static electricity is generated due to accumulation of relatively static positive charges and negative charges caused by relative movement, contact and separation of certain materials. The voltage of the static-electricity-proof charge detector can reach dozens of kilovolts, discharge is easy to occur, discharge sparks are generated, the product quality is poor, electronic equipment is damaged, an operational amplifier is used in static-electricity field detection equipment, the traditional operational amplifier has the defects of small input impedance, overlarge offset voltage, no offset voltage calibration circuit and the like, the static-electricity-proof charge detector cannot be applied to a super-resistance amplifier, and the static-electricity-proof charge detector cannot be applied to the field of static-electricity-proof charge detection and the field of low-light-level detection.
SUMMERY OF THE UTILITY MODEL
The utility model provides a charge amplifying device based on a resistance type sensor, which aims to solve the problems in the prior art.
The technical problem solved by the utility model is realized by adopting the following technical scheme: the utility model provides a charge amplification device based on resistance-type sensor, includes the control unit, is equipped with AD converting circuit on the control unit's the input, is equipped with amplifier A on AD converting circuit's the input, is equipped with beta value setting circuit on amplifier A's the input, amplifier A's input on be equipped with charge input circuit, be equipped with zero offset compensation circuit on one side of charge input circuit, parallel connection between zero offset compensation circuit and the amplifier A is equipped with harmonic filtering circuit on amplifier A's the output, harmonic filtering circuit and the control unit are connected.
AD converting circuit include electric capacity A, resistance RA, electric capacity B, amplifier B and ground connection circuit A, be equipped with ground connection circuit A on electric capacity A's the output, electric capacity A's input is connected with amplifier A, is equipped with resistance RA on electric capacity A's one side, is equipped with electric capacity B on resistance RA's the output, electric capacity B's output and ground connection circuit A are connected, resistance RA's the output on be equipped with amplifier B, amplifier B's one end and the control unit are connected.
The beta value setting circuit comprises a resistor RFA, a grounding line B and a resistor RFB, wherein the grounding line B is arranged on the output end of the resistor RFA, the input end of the resistor RFA is connected with the amplifier A, the resistor RFB is arranged on the output end of the amplifier A, and the resistor RFB is connected with the AD conversion circuit.
The charge INPUT circuit include switch A, inductance RA, INPUT port, inductance RB, switch B, negative pole voltage port, ground circuit C, resistance RB, electric capacity C, resistance RC and positive pole voltage port, be equipped with positive pole voltage port on switch A's the INPUT, be equipped with inductance RA on switch A's the output, one of inductance RA serves and is equipped with inductance RB and establish ties between the two, one of inductance RB serves and is equipped with INPUT port and establishes ties between the two, the other end of inductance RB on be equipped with switch B, one of switch B serves and is equipped with negative pole voltage port, inductance RA's output on be equipped with resistance RC, be equipped with resistance RB on resistance RC's the output, one of resistance RB serves and is equipped with electric capacity C and establishes ties between the two, is equipped with ground circuit C on electric capacity C's the one end output.
The zero offset compensation circuit comprises an adjustable resistor VR, two ends of the adjustable resistor VR are connected with the amplifier A, and an adjusting port of the adjustable resistor VR is connected with the harmonic filtering circuit.
The harmonic filtering circuit comprises an inductor LA, a capacitor D, a grounding circuit D, a capacitor E, an inductor LB, a capacitor F and a capacitor G, wherein one end of the inductor LA is connected with an amplifier A, the capacitor D is arranged on one side of the inductor LA, the grounding circuit D is arranged on the output end of the capacitor D, the capacitor D is connected with the inductor LA, the capacitor G is arranged on the other end of the inductor LA, the output end of the capacitor G is connected with the grounding circuit D, the inductor LA is connected with the amplifier B, the inductor LB is arranged on one end of the amplifier B, the capacitor F is arranged between the inductor LB and the amplifier B, the output end of the capacitor F is connected with the grounding circuit D, the capacitor E is arranged on the other end of the inductor LB, the output end of the capacitor E is connected with the grounding circuit D, and the inductor LB is connected with a zero offset compensation circuit.
The utility model has the beneficial effects that: the amplifier A is arranged, and the high-impedance characteristic device is beneficial to installation and use of a large-range monitoring point and low in use cost; a charge input circuit is provided to determine whether the static electricity eliminating effect is good.
Drawings
FIG. 1 is a circuit diagram of the present invention;
fig. 2 is a circuit diagram of an AD conversion circuit of the present invention;
FIG. 3 is a circuit diagram of the beta value setting circuit of the present invention;
FIG. 4 is a circuit diagram of the charge input circuit of the present invention;
FIG. 5 is a circuit diagram of the offset zero compensation circuit of the present invention;
fig. 6 is a circuit diagram of a harmonic filtering circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, a charge amplifying device based on a resistance sensor includes a control unit 1, an AD conversion circuit 2 is disposed on an input end of the control unit 1, an amplifier A3 is disposed on an input end of the AD conversion circuit 2, a β value setting circuit 4 is disposed on an input end of the amplifier A3, a charge input circuit 5 is disposed on an input end of the amplifier A3, a zero offset compensation circuit 6 is disposed on one side of the charge input circuit 5, the zero offset compensation circuit 6 and the amplifier A3 are connected in parallel, a harmonic filtering circuit 7 is disposed on an output end of the amplifier A3, and the harmonic filtering circuit 7 is connected with the control unit 1.
The AD conversion circuit 2 includes a capacitor a201, a resistor RA202, a capacitor B203, an amplifier B204, and a ground line a205, the ground line a205 is provided at the output end of the capacitor a201, the input end of the capacitor a201 is connected to an amplifier a3, the resistor RA202 is provided at one side of the capacitor a201, the capacitor B203 is provided at the output end of the resistor RA202, the output end of the capacitor B203 is connected to the ground line a205, the amplifier B205 is provided at the output end of the resistor RA202, and one end of the amplifier B205 is connected to the control unit 1.
The beta value setting circuit 4 comprises a resistor RFA401, a grounding line B402 and a resistor RFB403, wherein the grounding line B402 is arranged on the output end of the resistor RFA401, the input end of the resistor RFA401 is connected with an amplifier A3, the resistor RFB403 is arranged on the output end of an amplifier A3, and the resistor RFB403 is connected with the AD conversion circuit 2.
The charge INPUT circuit 5 comprises a switch A501, an inductor RA502, an INPUT port 503, an inductor RB504, a switch B505, a negative voltage port 506, a grounding circuit C507, a resistor RB508, a capacitor C509, a resistor RC510 and a positive voltage port 511, wherein the positive voltage port 511 is arranged on the INPUT end of the switch A501, the inductor RA502 is arranged on the output end of the switch A501, the inductor RB504 and the inductor RB are connected in series at one end of the inductor RA502, the INPUT port and the capacitor C509 are connected in series at one end of the inductor RB504, the switch B505 is arranged on the other end of the inductor RB504, the negative voltage port 506 is arranged on one end of the switch B505, the resistor RC510 is arranged on the output end of the inductor RA502, the resistor RB508 is arranged on the output end of the resistor RC510, the capacitor C509 and the resistor RB508 and the capacitor C509 are connected in series at one end, and the grounding circuit C507 is arranged on the output end of the capacitor C509.
The zero-offset compensation circuit 6 comprises an adjustable resistor VR601, two ends of the adjustable resistor VR601 are connected with an amplifier a3, and an adjusting port of the adjustable resistor VR601 is connected with the harmonic filtering circuit 7.
The harmonic filtering circuit 7 includes an inductor LA701, a capacitor D702, a ground line D703, a capacitor E704, an inductor LB705, a capacitor F706 and a capacitor G707, one end of the inductor LA701 is connected to an amplifier a3, the capacitor D702 is disposed on one side of the inductor LA701, the ground line D703 is disposed on an output end of the capacitor D702, the capacitor D702 is connected to the inductor LA701, the capacitor G707 is disposed on the other end of the inductor LA701, an output end of the capacitor G707 is connected to the ground line D703, the inductor LA701 is connected to the amplifier B204, the inductor LB705 is disposed on one end of the amplifier B204, the capacitor F706 is disposed between the inductor LB705 and the amplifier B204, an output end of the capacitor F706 is connected to the ground line D, the capacitor E zero point is disposed on the other end of the inductor LB 704, an output end of the capacitor E705 is connected to the ground line D703, and the inductor LB705 is connected to the offset compensation circuit 6.
In use, the charge voltage accumulated on the charge ion contact substrate in the charge INPUT circuit 5 is conducted to the INPUT port 503, the resistor RC510 to the operational amplifier INPUT pin in the amplifier a3, and the resistor RC510 is a voltage-dividing capacitor C509 for harmonic filtering; because the input current is small, the resistor RC510 and the resistor RB508 adopt G omega resistors, and the phenomenon that the divided voltage is attenuated excessively is prevented. Switch A501 and switch B505 are the open circuit state under normal operating condition, and in the circuit self-checking process, control unit 1 gives switch A501 and switch B505 closure signal respectively, and closure switch A501 input circuit obtains the positive voltage value signal, and closure switch B505 input circuit obtains the negative voltage value signal, and control unit 1 judges whether amplifier circuit is normal according to the positive negative voltage signal of feedback, and the monitoring of prevention amplifier circuit in-process is invalid. The ionization equipment static electricity removing capability is judged, positive and negative 100V voltages are respectively applied to the positive voltage port 511 and the negative voltage port 506, and the accumulated charge current of the output positive and negative ions is far greater than the current applied by R1R 2 due to the fact that the ion concentration of the ionization equipment is high; respectively applying positive voltage to the positive voltage port 511, disconnecting the negative voltage port 506, applying negative voltage to the negative voltage port 506 and the positive voltage port 511, according to the neutralization effect of positive and negative ion currents, if the current feedback voltage is less than the bias voltage of the static eliminating equipment, indicating that the static eliminating capability of the static eliminating equipment is normal, and if the current feedback voltage is greater than the bias voltage of the static eliminating equipment, indicating that the static eliminating capability of the static eliminating equipment is invalid.
The amplifier A3 has weak ion charge current, and the common amplifying device has small input impedance, so that the common amplifying device cannot meet the amplifying requirement, the input impedance (R is V/I) is not less than 1012 according to the grade requirement of the electrostatic material, the input offset current I is not more than 1nA, and the ultra-low bias current operational amplifier produced by TI company is selected according to the requirement; the input bias current of the operational amplifier input stage is less than or equal to 75fA (1nA is 1000fA) by adopting a PN junction isolation process, so that the high-impedance characteristic reaches and exceeds the traditional specially designed amplifier A3 consisting of a hybrid integrated circuit. The zero offset compensation circuit 6 arranged at one end of the amplifier A3 can adjust zero offset caused by offset voltage inherent to the amplifier A3, so as to provide zero precision of the amplifier. At the time of output of the amplifier a3, the harmonic filtering circuit 7 provides a regulated voltage to the operational amplifier. Finally, in the AD conversion circuit 2 of the control unit 1, the capacitor a201, the capacitor B203, and the resistor RA202 form an RC filter to filter harmonic interference signals, the amplifier B204 is a 12-bit AD conversion chip, and can perform digital conversion on the voltage value output from the pin 6 in the amplifier a3, and after the digital conversion, the voltage value is sent to the control unit 1 for data storage and display.
The device can be realized by arranging the amplifier A3, and the high-impedance characteristic device is beneficial to installation and use of a large-range monitoring point and has low use cost; a charge input circuit 5 is provided to determine whether or not the static electricity eliminating effect is good.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the term "directly" or "indirectly" may be used herein, and may refer to the connection between two elements or the interaction between two elements, unless otherwise specifically limited, and the specific meaning of the term in the present invention is understood to be that of one skilled in the art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A resistive sensor based charge amplification device comprising a control unit (1), characterized in that: be equipped with AD converting circuit (2) on the input of control unit (1), be equipped with amplifier A (3) on the input of AD converting circuit (2), be equipped with beta value on the input of amplifier A (3) and set up circuit (4), the input of amplifier A (3) on be equipped with charge input circuit (5), be equipped with zero offset compensation circuit (6) on one side of charge input circuit (5), parallel connection between zero offset compensation circuit (6) and amplifier A (3), be equipped with harmonic filtering circuit (7) on the output of amplifier A (3), harmonic filtering circuit (7) are connected with control unit (1).
2. The resistive sensor based charge amplifying device according to claim 1, wherein: AD converting circuit (2) include electric capacity A (201), resistance RA (202), electric capacity B (203), amplifier B (204) and ground connection A (205), be equipped with ground connection A (205) on the output of electric capacity A (201), the input and the amplifier A (3) of electric capacity A (201) are connected, be equipped with resistance RA (202) on one side of electric capacity A (201), be equipped with electric capacity B (203) on the output of resistance RA (202), the output and the ground connection A (205) of electric capacity B (203) are connected, the output of resistance RA (202) on be equipped with amplifier B (204), the one end and the control unit (1) of amplifier B (204) are connected.
3. The resistive sensor based charge amplifying device according to claim 1, wherein: the beta value setting circuit (4) comprises a resistor RFA (401), a grounding line B (402) and a resistor RFB (403), the grounding line B (402) is arranged on the output end of the resistor RFA (401), the input end of the resistor RFA (401) is connected with the amplifier A (3), the resistor RFB (403) is arranged on the output end of the amplifier A (3), and the resistor RFB (403) is connected with the AD conversion circuit (2).
4. The resistive sensor based charge amplifying device according to claim 1, wherein: the charge INPUT circuit (5) comprises a switch A (501), an inductor RA (502), an INPUT port (503), an inductor RB (504), a switch B (505), a negative voltage port (506), a grounding circuit C (507), a resistor RB (508), a capacitor C (509), a resistor RC (510) and a positive voltage port (511), wherein the INPUT end of the switch A (501) is provided with the positive voltage port (511), the output end of the switch A (501) is provided with the inductor RA (502), one end of the inductor RA (502) is provided with the inductor RB (504) and connected in series, one end of the inductor RB (504) is provided with the INPUT port and connected in series, the other end of the inductor RB (504) is provided with the switch B (505), one end of the switch B (505) is provided with the negative voltage port (506), the output end of the inductor RA (502) is provided with the resistor RC (510), the output end of the resistor RC (510) is provided with a resistor RB (508), one end of the resistor RB (508) is provided with a capacitor C (509), the resistor RB and the capacitor C (509) are connected in series, and the output end of one end of the capacitor C (509) is provided with a grounding circuit C (507).
5. The resistive sensor based charge amplifying device according to claim 1, wherein: the zero offset compensation circuit (6) comprises an adjustable resistor VR (601), two ends of the adjustable resistor VR (601) are connected with the amplifier A (3), and an adjusting port of the adjustable resistor VR (601) is connected with the harmonic filtering circuit (7).
6. The resistive sensor based charge amplifying device according to claim 1, wherein: the harmonic filtering circuit (7) comprises an inductor LA (701), a capacitor D (702), a grounding line D (703), a capacitor E (704), an inductor LB (705), a capacitor F (706) and a capacitor G (707), one end of the inductor LA (701) is connected with the amplifier A (3), the capacitor D (702) is arranged on one side of the inductor LA (701), the grounding line D (703) is arranged on the output end of the capacitor D (702), the capacitor D (702) is connected with the inductor LA (701), the capacitor G (707) is arranged on the other end of the inductor LA (701), the output end of the capacitor G (707) is connected with the grounding line D (703), the inductor LA (701) is connected with the amplifier B (204), the inductor LB (705) is arranged on one end of the amplifier B (204), the capacitor F (706) is arranged between the inductor LB (705) and the amplifier B (204), the output end of the capacitor F (706) is connected with the grounding line D (703), and a capacitor E (704) is arranged at the other end of the inductor LB (705), the output end of the capacitor E (704) is connected with a grounding line D (703), and the inductor LB (705) is connected with a zero offset compensation circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121805230.7U CN215894768U (en) | 2021-08-04 | 2021-08-04 | Charge amplification device based on resistance type sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121805230.7U CN215894768U (en) | 2021-08-04 | 2021-08-04 | Charge amplification device based on resistance type sensor |
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| CN215894768U true CN215894768U (en) | 2022-02-22 |
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| CN202121805230.7U Active CN215894768U (en) | 2021-08-04 | 2021-08-04 | Charge amplification device based on resistance type sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702723A (en) * | 2021-08-26 | 2021-11-26 | 深圳联合净界科技有限公司 | Ion online monitoring device and monitoring method based on resistance type sensor |
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2021
- 2021-08-04 CN CN202121805230.7U patent/CN215894768U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702723A (en) * | 2021-08-26 | 2021-11-26 | 深圳联合净界科技有限公司 | Ion online monitoring device and monitoring method based on resistance type sensor |
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