CN115133745A - Interference suppression and overvoltage and undervoltage protection device for precision instrument and equipment - Google Patents
Interference suppression and overvoltage and undervoltage protection device for precision instrument and equipment Download PDFInfo
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- CN115133745A CN115133745A CN202210582332.XA CN202210582332A CN115133745A CN 115133745 A CN115133745 A CN 115133745A CN 202210582332 A CN202210582332 A CN 202210582332A CN 115133745 A CN115133745 A CN 115133745A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides an interference suppression and overvoltage and undervoltage protection device for precision instrument equipment, which comprises an interference suppression module, an overvoltage and undervoltage protection module and an output module, wherein the interference suppression module is respectively connected with the overvoltage and undervoltage protection module and the output module; the interference suppression module is connected with an external power supply and used for carrying out spike pulse suppression on the voltage of the external power supply to output a target voltage and transmitting the target voltage to the overvoltage and undervoltage protection module and the output module; the overvoltage and undervoltage protection module is used for disconnecting the interference suppression module from the output module when the received target voltage is overvoltage or undervoltage; and the output module is used for providing target voltage for the precision instrument when the interference suppression module is connected with the output module. According to the device disclosed by the invention, the spike pulse suppression, overvoltage and undervoltage protection of precision instruments and equipment are comprehensively realized.
Description
Technical Field
The utility model relates to a precision instruments equipment protection technical field especially relates to an interference suppression and cross undervoltage protection device for precision instruments equipment.
Background
Precision instruments and equipment are an important type of instruments and meters, and the normal operation of the precision instruments and equipment often requires an external power supply (generally a power grid power supply) to provide electric energy. After the external power supply is connected, the precision instrument begins to generate or detect precision quantity. When generating or detecting accurate quantity, the precision requirement to the precision instrument equipment is higher. In order to ensure the high precision of the precision instrument, the requirements of various technical indexes such as performance, precision and the like during the design of the precision instrument are met, and the requirements of the safety and the stability of the power supply of an external power supply during the normal operation of the precision instrument are also met.
In the prior art, precision instruments and equipment are often directly connected to an external power supply, and an overvoltage protection circuit or an undervoltage protection circuit is designed only by considering the undervoltage condition or the overvoltage condition in the external power supply, so that the accuracy of the precision instruments and equipment is prevented from being reduced due to undervoltage or overvoltage of the external power supply, however, the instability of the power supply of the external power supply comprises various conditions such as pulse interference, overvoltage and undervoltage, and the prior art cannot comprehensively realize sharp pulse suppression, overvoltage and undervoltage protection on the precision instruments and equipment.
Disclosure of Invention
The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the interference suppression and overvoltage and undervoltage protection device for the precision instrument and equipment is provided, and the purpose is to comprehensively realize the sharp pulse suppression, overvoltage and undervoltage protection for the precision instrument and equipment.
According to a first aspect of the present disclosure, an interference suppression and overvoltage and undervoltage protection apparatus for a precision instrument device is provided, including an interference suppression module, an overvoltage and undervoltage protection module, and an output module, where the interference suppression module is connected to the overvoltage and undervoltage protection module and the output module respectively;
the interference suppression module is connected with an external power supply, and is used for carrying out spike pulse suppression on the voltage of the external power supply to output a target voltage and transmitting the target voltage to the overvoltage and undervoltage protection module and the output module;
the overvoltage and undervoltage protection module is used for disconnecting the interference suppression module from the output module when the received target voltage is overvoltage or undervoltage;
and the output module is used for providing target voltage for precision instrument equipment when the interference suppression module is connected with the output module.
In an embodiment of the present disclosure, the interference suppression module includes a positive half-cycle suppression unit and a negative half-cycle suppression unit, the positive half-cycle suppression unit and the negative half-cycle suppression unit are connected in parallel, the positive half-cycle suppression unit is configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in a positive half cycle, and the negative half-cycle suppression unit is configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in a negative half cycle.
In one embodiment of the present disclosure, the positive half cycle suppression unit includes a first diode, a first resistor, a first capacitor, and a third capacitor, and the first resistor, the first capacitor, and the third capacitor are connected in parallel to each other and then connected to a cathode of the first diode; the negative half-cycle suppression unit comprises a second diode, a second resistor, a second capacitor and a fourth capacitor, wherein the second resistor, the second capacitor and the fourth capacitor are connected in parallel and then connected with the anode of the second diode.
In one embodiment of the present disclosure, the interference suppression module further includes a voltage dependent resistor connected to an anode of the first diode and a cathode of the second diode, respectively.
In one embodiment of the present disclosure, the interference rejection module further comprises a first common mode filter and a second common mode filter, the first common mode filter comprising a first input terminal, a second input terminal, a first output terminal and a second output terminal, the second common mode filter comprising a third input terminal, a fourth input terminal, a third output terminal and a fourth output terminal; the first input end is connected with the positive pole of the external power supply, the second input end is connected with the negative pole of the external power supply, the first output end is respectively connected with the piezoresistor and the third input end, the second output end is respectively connected with the positive half cycle suppression unit, the negative half cycle suppression unit and the fourth input end, and the third output end and the fourth output end are simultaneously connected with the over-voltage and under-voltage protection module and the output module.
In an embodiment of the present disclosure, the interference suppression module further includes a fifth capacitor and a sixth capacitor, an anode of the fifth capacitor is connected to the first output terminal, a cathode of the fifth capacitor is grounded, an anode of the sixth capacitor is grounded, and a cathode of the sixth capacitor is connected to the second output terminal.
In one embodiment of the present disclosure, the overvoltage and undervoltage protection module includes a transformer, a rectifier bridge, and an overvoltage and undervoltage protection unit, and the overvoltage and undervoltage protection unit includes a third resistor, a fourth resistor, a first thyristor, a second thyristor, a first potentiometer, a second potentiometer, a first relay, and a second relay; the transformer is connected with a first alternating current end and a second alternating current end of the rectifier bridge, and a first direct current end of the rectifier bridge is connected with a second direct current end of the rectifier bridge through the third resistor and the fourth resistor; a first end of the third resistor is connected with a coil input end of the first relay and a coil input end of the second relay, the second end of the third resistor is connected with the first end of the fourth resistor, the first end of the first potentiometer, the sliding end of the first potentiometer, the first end of the second potentiometer, the coil output end of the first relay and the input end of the first controllable silicon, the second end of the fourth resistor is connected with the output end of the first controllable silicon and the output end of the second controllable silicon, the control end of the first controllable silicon is connected with the second end of the first potentiometer, the control end of the second controllable silicon is connected with the second end of the second potentiometer and the sliding end of the second potentiometer, the input end of the second controllable silicon is connected with the coil output end of the second relay, the normally closed contact of the first relay and the normally open contact of the second relay are arranged on the connecting lead of the interference suppression module and the output module.
In one embodiment of the present disclosure, the overvoltage and undervoltage protection unit further includes a first freewheeling diode connected in parallel with the coil of the first relay, and a second freewheeling diode connected in parallel with the coil of the second relay.
In an embodiment of the disclosure, the overvoltage and undervoltage protection unit further includes a seventh capacitor and/or a reset button, the seventh capacitor is connected in parallel with the second freewheeling diode, and the reset button is connected in series to a connection lead between the output terminal of the first thyristor and the second terminal of the fourth resistor.
In one embodiment of the present disclosure, the output module is a socket.
In one or more embodiments of the present disclosure, the interference suppression module is respectively connected to the overvoltage and undervoltage protection module and the output module; the interference suppression module is connected with an external power supply and used for carrying out spike pulse suppression on the voltage of the external power supply to output a target voltage and transmitting the target voltage to the overvoltage and undervoltage protection module and the output module; the overvoltage and undervoltage protection module is used for disconnecting the interference suppression module from the output module when the received target voltage is overvoltage or undervoltage; and the output module is used for providing target voltage for the precision instrument equipment when the interference suppression module is connected with the output module. Under the condition, an interference suppression module, an overvoltage and undervoltage protection module and an output module are comprehensively utilized, wherein the interference suppression module performs spike pulse suppression on the voltage of an external power supply to output a target voltage, and the overvoltage and undervoltage protection module is used for blocking the interference suppression module from outputting the target voltage to the output module when the target voltage is overvoltage or undervoltage. Therefore, the sharp pulse suppression, overvoltage and undervoltage protection of the precision instrument can be comprehensively realized.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a block diagram of an interference suppression and overvoltage and undervoltage protection apparatus for a precision instrument provided by an embodiment of the present disclosure;
fig. 2 illustrates a circuit diagram of an interference suppression module provided by an embodiment of the present disclosure;
fig. 3 shows a block diagram of an overvoltage and undervoltage protection module provided by an embodiment of the disclosure;
fig. 4 shows a circuit diagram of an overvoltage and undervoltage protection unit provided by the embodiment of the disclosure;
fig. 5 shows a circuit diagram of an interference suppression and overvoltage and undervoltage protection device for precision instruments and equipment provided by an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosed embodiments, as detailed in the appended claims.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present disclosure, and should not be construed as limiting the present disclosure.
The present precision instrument equipment, its precision is high, and the safety and stability requirement to its power supply is also relatively higher, for the safety and stability of guaranteeing precision instrument consumer during operation, less unnecessary economic loss, the present disclosure provides an interference suppression and cross undervoltage protection device for precision instrument equipment, and main aim at synthesizes the sharp pulse suppression, excessive pressure, the undervoltage protection that realize precision instrument equipment. The interference suppression and overvoltage and undervoltage protection device for the precision instrument can be referred to as a protection device for short.
In a first embodiment, fig. 1 shows a block diagram of an interference suppression and overvoltage and undervoltage protection apparatus for a precision instrument and device provided in the embodiment of the present disclosure, as shown in fig. 1, the interference suppression and overvoltage and undervoltage protection apparatus 10 for a precision instrument and device includes an interference suppression module 11, an overvoltage and undervoltage protection module 12, and an output module 13, where the interference suppression module 11 is connected to the overvoltage and undervoltage protection module 12 and the output module 13, respectively.
In this embodiment, the interference suppression module 11 is connected to an external power supply, and the interference suppression module 11 is configured to output a target voltage after performing spike suppression on a voltage of the external power supply, and send the target voltage to the overvoltage/undervoltage protection module 12 and the output module 13. The target voltage is synchronous and consistent with the voltage of the external power supply. For example, when the voltage of the external power supply is 220V, the target voltage is also 220V.
In this embodiment, the external power source is a power grid power source, and it is easy to understand that the power grid power source periodically provides alternating current. Each period comprises a positive half cycle and a negative half cycle, the voltage is a non-negative value in the positive half cycle, and the voltage is a non-positive value in the negative half cycle.
In the present embodiment, the interference suppression module 11 includes a positive half-cycle suppression unit and a negative half-cycle suppression unit, the positive half-cycle suppression unit and the negative half-cycle suppression unit being connected in parallel, the positive half-cycle suppression unit being configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in the positive half-cycle, and the negative half-cycle suppression unit being configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in the negative half-cycle.
Fig. 2 shows a circuit diagram of an interference suppression module provided in an embodiment of the present disclosure.
In some embodiments, as shown in fig. 2, the positive half cycle suppressing unit includes a first diode D1, a first resistor R1, a first capacitor C1, and a third capacitor C3, and the first resistor R1, the first capacitor C1, and the third capacitor C3 are connected in parallel to each other and then connected to the cathode of the first diode D1. Specifically, the positive electrode of the first capacitor C1 is connected to the cathode of the first diode D1, the first resistor R1 is connected in parallel with the first capacitor C1, the third capacitor C3 is connected in parallel with the first capacitor C1, and the first resistor R1, the first capacitor C1 and the third capacitor C3 are connected in parallel to form a first junction and a second junction, where the first junction is a junction on the positive electrode side of the first capacitor C1, and the second junction is a junction on the negative electrode side of the first capacitor C1. The first resistor R1 may be a resistor with a resistance of 20K Ω, for example. The first capacitor C1 may be, for example, a capacitor having a capacity of 470 μ F and a withstand voltage of 50V. The third capacitor C3 may be, for example, a capacitor having a capacitance of 0.1 μ F.
In some embodiments, as shown in fig. 2, the negative half cycle suppressing unit includes a second diode D2, a second resistor R2, a second capacitor C2, and a fourth capacitor C4, and the second resistor R2, the second capacitor C2, and the fourth capacitor C4 are connected in parallel to each other and then connected to an anode of the second diode D2. Specifically, the cathode of the second capacitor C2 is connected to the anode of the second diode D2, the second resistor R2 is connected in parallel with the second capacitor C2, the fourth capacitor C4 is connected in parallel with the second capacitor C2, and the second resistor R2, the second capacitor C2 and the fourth capacitor C4 are connected in parallel to form a third sink and a fourth sink, where the third sink is a sink on the negative side of the second capacitor C2, and the fourth sink is a sink on the positive side of the second capacitor C2. The second resistor R2 may be, for example, a resistor with a resistance of 20K Ω. The second capacitor C2 may be, for example, a capacitor having a capacity of 470 μ F and a withstand voltage of 50V. The fourth capacitor C4 may be, for example, a capacitor having a capacity of 0.1 μ F.
In some embodiments, as shown in fig. 2, the interference suppression module 11 may further include a voltage dependent resistor RV, and the voltage dependent resistor RV is respectively connected to the anode of the first diode D1 and the cathode of the second diode D2. The voltage dependent resistor RV may be a voltage dependent resistor of nominal voltage 290V, power 2W, for example. Therefore, the voltage dependent resistor RV can play a role in protection, overcurrent prevention and lightning protection. In addition, the first resistor R1 is a current limiting resistor of the voltage dependent resistor RV, and the first resistor R1 determines the operating current of the voltage dependent resistor RV, which is not easy to be too large, otherwise the power consumption of the voltage dependent resistor RV is increased to generate heat.
In some embodiments, as shown in fig. 2, the interference rejection module 11 further includes a first common-mode filter B1 and a second common-mode filter B2. The parameters of the magnetic ring in the first common mode filter B1 may be, for example, outer diameter phi 16mm, inner diameter phi 8mm, and ring height 5mm, the magnetic ring is formed by double-winding a high-strength enameled wire with double-layer paint in 40-50 turns, the outer diameter of the high-strength enameled wire may be phi 0.55, and the inductance in the first common mode filter B1 may be between 500 μ H and 1 mH. The parameters of the second common mode filter B2 may be consistent with the first common mode filter B1.
In some embodiments, as shown in fig. 2, the first common-mode filter B1 includes a first input, a second input, a first output, and a second output, and the second common-mode filter B2 includes a third input, a fourth input, a third output, and a fourth output; the first input end is connected with the positive pole of the external power supply, the second input end is connected with the negative pole of the external power supply, the first output end is respectively connected with the voltage dependent resistor RV and the third input end, the second output end is respectively connected with the positive half cycle suppression unit, the negative half cycle suppression unit and the fourth input end, namely the second output end is respectively connected with the second junction of the positive half cycle suppression unit, the fourth junction of the negative half cycle suppression unit and the fourth input end. In addition, the third output terminal and the fourth output terminal output the target voltage, and the third output terminal and the fourth output terminal are simultaneously connected with the overvoltage/undervoltage protection module 12 and the output module 13 (see fig. 5). Therefore, the first common mode filter and the second common mode filter can enhance the spike suppression effect of the interference suppression module.
In some embodiments, as shown in fig. 2, the interference suppression module 11 further includes a fifth capacitor C5 and a sixth capacitor C6, wherein an anode of the fifth capacitor C5 is connected to the first output terminal, a cathode of the fifth capacitor C5 is grounded, an anode of the sixth capacitor C6 is grounded, and a cathode of the sixth capacitor C6 is connected to the second output terminal. Therefore, the fifth capacitor and the sixth capacitor can suppress high-frequency interference. In some embodiments, the fifth capacitance C5 may be, for example, a capacitance of 0.1 μ F. The sixth capacitor C6 may be, for example, a capacitor having a capacity of 0.1 μ F.
In this embodiment, the overvoltage/undervoltage protection module 12 is configured to disconnect the interference suppression module 11 from the output module 13 when the received target voltage is overvoltage or undervoltage.
It is easy to understand that the overvoltage is a first preset proportion of the grid voltage exceeding the working voltage, the undervoltage is a second preset proportion of the grid voltage lower than the working voltage, wherein the working voltage can be 220V for example, and the first preset proportion and the second preset proportion can be set according to actual conditions. The first predetermined proportion may be taken, for example, from 10% to 25%, and the second predetermined proportion may be taken, for example, from 10% to 25%. The voltage range corresponding to the second preset proportion of the working voltage to the first preset proportion of the working voltage is the set power voltage range (i.e. the normal voltage range).
Fig. 3 shows a block diagram of an overvoltage and undervoltage protection module provided by an embodiment of the present disclosure. Fig. 4 shows a circuit diagram of an overvoltage and undervoltage protection unit provided by the embodiment of the disclosure. Fig. 5 shows a circuit diagram of the interference suppression and under-voltage protection device 10 for precision instruments and equipment provided by the embodiment of the disclosure.
In some embodiments, as shown in fig. 3, the overvoltage and undervoltage protection module 12 includes a transformer, a rectifier bridge, and an overvoltage and undervoltage protection unit. Wherein, the transformer, the rectifier bridge and the over-voltage and under-voltage protection unit are connected in sequence.
In some embodiments, a transformer is used to step down the received target voltage. Specifically, the transformer includes a primary side and a secondary side, as shown in fig. 4 and 5, the primary side of the transformer B3 is connected to the third output terminal and the fourth output terminal of the second common-mode filter B2, and the secondary side of the transformer B3 is connected to the first ac terminal and the second ac terminal of the rectifier bridge, where the primary side is configured to receive the target voltage output by the interference suppression module 11, and step down the target voltage through the primary side and the secondary side. The ratio of the number of turns of the primary winding to the number of turns of the secondary winding may be 55:6, for example, and if the target voltage is 220V, the secondary output voltage is 24V.
In some embodiments, a rectifier bridge is used to convert the ac power output by the transformer B3 to dc power. Specifically, the rectifier bridge includes a first ac terminal, a second ac terminal, a first dc terminal and a second dc terminal, where the first ac terminal and the second ac terminal of the rectifier bridge are connected to the secondary side of the transformer B3, and the first dc terminal and the second dc terminal of the rectifier bridge are connected to the overvoltage/undervoltage protection unit.
In some embodiments, as shown in fig. 4, the undervoltage protection unit includes a third resistor R3, a fourth resistor R4, a first thyristor 3CT1, a second thyristor 3CT2, a first potentiometer W1, a second potentiometer W2, a first relay J1, and a second relay J2.
As will be readily understood, the potentiometer includes a resistor body and a sliding end, the resistor body includes two ends (i.e., a first end and a second end), and the output voltage of the potentiometer is changed by the sliding of the sliding end. The relay includes a coil and a contact. Wherein the contacts may be normally closed contacts or normally open contacts.
In some embodiments, the third resistor R3 may be, for example, a resistor having a resistance of 2K Ω. Fourth electricityThe resistor R4 may be, for example, a resistor having a resistance of 16K Ω. The first potentiometer W1 may be a potentiometer having a resistor of 47K Ω, for example, and the second potentiometer W2 may be a potentiometer having a resistor of 10K Ω, for example. The first relay J1 includes a first coil and a normally closed contact J a The second relay J2 comprises a second coil and a normally open contact J b 。
In some embodiments, as shown in fig. 4 and 5, the first dc terminal of the rectifier bridge is connected to the second dc terminal of the rectifier bridge via a third resistor R3 and a fourth resistor R4; a first end of a third resistor R3 is connected with a coil input end of a first relay J1 and a coil input end of a second relay J2, a second end of a third resistor R3 is connected with a first end of a fourth resistor R4, a first end of a first potentiometer W1, a sliding end of the first potentiometer W1, a first end of a second potentiometer W2, a coil output end of the first relay J1 and an input end of a first thyristor 3CT1, a second end of the fourth resistor R4 is connected with an output end of the first thyristor 3CT1 and an output end of the second thyristor 3CT2, a control end of the first thyristor 3CT1 is connected with a second end of the first potentiometer W1, a control end of the second thyristor 3CT2 is connected with a second end of the second potentiometer W2 and a sliding end of the second potentiometer W2, an input end of the second thyristor 3CT2 is connected with a coil output end of the second relay J2, and a normally closed contact 1 of the first relay J8225 a And a normally open contact J of a second relay J2 b Is arranged on the connecting lead of the interference suppression module 11 and the output module 13.
In some embodiments, as shown in fig. 4, the overvoltage/undervoltage protection unit further includes a first freewheeling diode V1 and a second freewheeling diode V2, the first freewheeling diode V1 being connected in parallel with the coil (i.e., the first coil) of the first relay J1, and the second freewheeling diode V2 being connected in parallel with the coil (i.e., the second coil) of the second relay J2. Thereby, it is convenient to protect the first and second thyristors by the first and second freewheeling diodes.
In some embodiments, as shown in fig. 4, the overvoltage and undervoltage protection unit may further include a seventh capacitor C7. The seventh capacitor C7 is connected in parallel with the second freewheeling diode V2. In this case, when the interference suppression and overvoltage/undervoltage protection device 10 for a precision instrument and equipment of the present disclosure is debugged by means of the voltage regulator, if the second relay J2 is not released when the voltage output from the voltage regulator is adjusted from the normal voltage range to undervoltage, the release of the second relay J2 is ensured by connecting the seventh capacitor C7 in parallel. In some embodiments, the seventh capacitor C7 may be, for example, an electrolytic capacitor with a capacity of 1 μ F and a withstand voltage of 50V.
In some embodiments, as shown in fig. 4, the undervoltage protection unit may further include a reset button TA. The reset button TA is serially connected to a connecting lead between the output terminal of the first thyristor 3CT1 and the second terminal of the fourth resistor R4. In this case, when the interference suppression and overvoltage/undervoltage protection device 10 for a precision instrument and equipment of the present disclosure is debugged by means of the voltage regulator, if the first relay J1 is not released when the voltage output from the voltage regulator is adjusted from the overvoltage to the normal voltage range, the release of the first relay J1 is ensured by the reset button TA.
In the present embodiment, the output module 13 is used for providing a target voltage for a load (e.g., a precision instrument device) when the interference suppression module 11 is connected to the output module 13.
In some embodiments, the output module 13 is connected to the third output terminal and the fourth output terminal of the second common mode filter B2 of the interference suppression module 11 through connecting wires, wherein the normally closed contact J of the first relay J1 in the undervoltage protection module 12 is normally closed a And a normally open contact J of a second relay J2 b A normally closed contact J arranged on the connecting wire between the interference suppression module 11 and the output module 13 a And a normally open contact J b In series, if normally closed contact J a Normally open contact J remaining closed b When closed, the interference suppression module 11 is connected (i.e., in a conducting state) with the output module 13, and the interference suppression module 11 can provide the target voltage for the load if the normally closed contact J is used a Open or normally open contact J b And if the voltage is disconnected, the interference suppression module 11 is disconnected from the output module 13 (i.e., in a disconnected state), and the interference suppression module 11 cannot provide the target voltage for the load.
In some embodiments, as shown in fig. 5, the output module 13 may be a socket CZ.
Specifically, for example, the voltage of the external power supply is 220V, and the set power supply voltage range is 170V-250V, the specific operating principle of the interference suppression and overvoltage/undervoltage protection device 10 for precision instruments and equipment of the present disclosure includes:
the working principle of the interference suppression module 11 is as follows: when the power grid is in a positive half cycle, current charges the first capacitor C1 through the piezoresistor RV and the first diode D1, the on-time internal resistance of the piezoresistor RV is extremely small, so the charging time is extremely short, the time constants of the first resistor R1 and the first capacitor C1 are very large, discharging is slow, the voltage on the first capacitor C1 is kept near 21V, when a sharp pulse occurs, surge current enters the ground through the piezoresistor RV, the first diode D1 and the first capacitor C1, the voltage drop on the piezoresistor RV is still kept near an original value due to the fact that the capacity of the first capacitor C1 is very large, and therefore the sharp pulse is restrained, wherein the first resistor R1 is the current limiting resistor of the piezoresistor RV and determines the working current of the piezoresistor RV, the working current is not easy to be overlarge, and otherwise the power consumption of the piezoresistor RV can be increased to generate heat; the second diode D2, the second resistor R2 and the second capacitor C2 work in the negative half cycle of the power grid; the sharp pulse near the peak value can be cut off at the root by the interference suppression module 11, the sharp pulse in the non-peak area can be limited at the peak value, the voltage change of the first capacitor C1 can keep up with the change of the sine wave of the power grid, but the sharp pulse can not change the voltage of the first capacitor C1. In addition, the interference suppression module 11 further includes a first common-mode filter B1, a second common-mode filter B2, a fifth capacitor C5, and a sixth capacitor C6, where the first common-mode filter B1 and the second common-mode filter B2 can enhance the suppression effect, and the fifth capacitor C5 and the sixth capacitor C6 suppress high-frequency interference;
the working principle of the overvoltage and undervoltage protection module 12 is as follows: when the target voltage exceeds the set power supply voltage range (namely overvoltage), the load power supply is cut off, the gate trigger voltages of the first silicon controlled rectifier 3CT1 and the second silicon controlled rectifier 3CT2 which are composed of the third resistor R3 and the fourth resistor R4 are controlled by the first potentiometer W1 and the second potentiometer W2, when the overvoltage occurs, the first relay J1 acts, when the undervoltage occurs, the second relay J2 acts, the first follow current and the second follow current actThe pole tube V1 and the second freewheeling diode V2 are used for protecting the first thyristor 3CT1 and the second thyristor 3CT 2; specifically, if the target voltage is within the set power supply voltage range, the first relay J1 is not actuated, and its normally closed contact J a Closed and the second relay J2 is actuated, its normally open contact J b When the power supply voltage is out of the set power supply voltage range, for example, when the target voltage is higher than 250V, the target voltage is over-voltage, the secondary voltage (secondary side output voltage) of the transformer B3 is correspondingly increased, the voltages on the gates of the first thyristors 3CT1 and 3CT2 are simultaneously increased, when the gate trigger current of the first thyristor 3CT1 is reached, the first thyristor 3CT1 is switched from off to on, the first relay J1 is operated, and the normally closed contact J1 is normally closed a Disconnecting the load, thereby protecting the load from burning out by high voltage; when the current voltage drops to be lower than 170V, the voltage on the second resistor R2 can not make the second thyristor 3CT2 keep on and cut off, and the normally open contact J of the second relay J2 b The load is disconnected.
In addition, the overvoltage and undervoltage protection module 12 of the present disclosure needs to be debugged periodically, and the debugging steps are as follows: by means of the single-phase autotransformer, firstly, the output voltage of the single-phase autotransformer is adjusted to 170V, a multimeter is used for monitoring, a potentiometer second potentiometer W2 enables a second thyristor 3CT2 to be conducted, a second relay J2 is operated, then the output voltage of the single-phase autotransformer is enabled to be smaller than 170V, such as 160 plus 165V, at the moment, a second relay J2 can be released, if the second relay J7 can not be released, a seventh capacitor C7 can be connected in parallel to two ends of a second coil of a second relay J2 of an over-voltage and under-voltage protection unit, so as to ensure that the second relay J2 is released, then the output voltage of the single-phase autotransformer is increased to be larger than 250V, a potentiometer first potentiometer W1 is adjusted to enable 3CT to be conducted, a first relay J1 is operated, the output voltage of the single-phase autotransformer is reduced, such as 240 plus 245V, the first relay J1 is released, if the output voltage can not be released, a reset button TA can be arranged in an anode loop of the first thyristor 3CT1, the first relay J1 can be released by pressing a reset button TA, then the output voltage of the single-phase self-coupling voltage regulator is increased to more than 250V, the first relay J1 can act, and the process is repeatedly and carefully debugged to confirm that 2 relays normally work under the set power supply voltage range so as to ensure the stable and reliable work of the load.
The above-mentioned serial numbers of the embodiments of the present disclosure are merely for description, and do not represent the advantages or disadvantages of the embodiments.
In the interference suppression and overvoltage and undervoltage protection device for the precision instrument, an interference suppression module is respectively connected with an overvoltage and undervoltage protection module and an output module; the interference suppression module is connected with an external power supply and used for carrying out spike pulse suppression on the voltage of the external power supply to output a target voltage and transmitting the target voltage to the overvoltage and undervoltage protection module and the output module; the overvoltage and undervoltage protection module is used for disconnecting the interference suppression module from the output module when the received target voltage is overvoltage or undervoltage; the output module is used for providing target voltage for the precision instrument when the interference suppression module is connected with the output module. Under the condition, an interference suppression module, an overvoltage and undervoltage protection module and an output module are comprehensively utilized, wherein the interference suppression module performs spike pulse suppression on the voltage of an external power supply to output a target voltage, and the overvoltage and undervoltage protection module is used for blocking the interference suppression module from outputting the target voltage to the output module when the target voltage is overvoltage or undervoltage. Therefore, the sharp pulse suppression, overvoltage and undervoltage protection of the precision instrument can be comprehensively realized. Specifically, the protection device disclosed by the invention utilizes a semiconductor technology, is formed by combining and designing electronic components such as an inductor, a diode, a silicon controlled rectifier, a relay, a resistor and a capacitor, organically combines power grid pulse anti-interference protection with overvoltage and undervoltage protection to obtain a more perfect protection circuit, realizes functions such as power grid spike pulse suppression, overvoltage and undervoltage protection, solves the problem of reducing property loss to the maximum extent of safety protection of precision instruments and equipment, and realizes the advantages of safe and stable operation, less capital investment, stable and reliable work and the like of multifunctional protection precision instruments. In addition, the protection device can also reasonably match with an uninterruptible power supply according to the power of precision instruments and equipment, and safe, stable and reliable operation is better realized.
There is shown in the drawings a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated and some details may be omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel or sequentially or in different orders, and the present disclosure is not limited thereto as long as the desired results of the technical solutions of the present disclosure can be achieved.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. An interference suppression and overvoltage and undervoltage protection device for precision instrument equipment is characterized by comprising an interference suppression module, an overvoltage and undervoltage protection module and an output module, wherein the interference suppression module is respectively connected with the overvoltage and undervoltage protection module and the output module;
the interference suppression module is connected with an external power supply, and is used for carrying out spike pulse suppression on the voltage of the external power supply to output a target voltage and transmitting the target voltage to the overvoltage and undervoltage protection module and the output module;
the overvoltage and undervoltage protection module is used for disconnecting the interference suppression module from the output module when the received target voltage is overvoltage or undervoltage;
the output module is used for providing target voltage for the precision instrument when the interference suppression module is connected with the output module.
2. The apparatus of claim 1, wherein the interference suppression module comprises a positive half-cycle suppression unit and a negative half-cycle suppression unit, the positive half-cycle suppression unit and the negative half-cycle suppression unit are connected in parallel, the positive half-cycle suppression unit is configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in a positive half-cycle, and the negative half-cycle suppression unit is configured to perform spike suppression on the voltage of the external power supply when the voltage of the external power supply is in a negative half-cycle.
3. The apparatus as claimed in claim 2, wherein the positive half cycle suppressing unit comprises a first diode, a first resistor, a first capacitor and a third capacitor, and the first resistor, the first capacitor and the third capacitor are connected in parallel with each other and then connected to a cathode of the first diode; the negative half-cycle suppression unit comprises a second diode, a second resistor, a second capacitor and a fourth capacitor, wherein the second resistor, the second capacitor and the fourth capacitor are connected in parallel and then connected with the anode of the second diode.
4. The apparatus of claim 3, wherein the interference suppression module further comprises a voltage dependent resistor connected to the anode of the first diode and the cathode of the second diode.
5. The apparatus of claim 4, wherein the interference rejection module further comprises a first common mode filter and a second common mode filter, the first common mode filter comprising a first input terminal, a second input terminal, a first output terminal and a second output terminal, the second common mode filter comprising a third input terminal, a fourth input terminal, a third output terminal and a fourth output terminal; the first input end is connected with the positive pole of the external power supply, the second input end is connected with the negative pole of the external power supply, the first output end is respectively connected with the piezoresistor and the third input end, the second output end is respectively connected with the positive half cycle suppression unit, the negative half cycle suppression unit and the fourth input end, and the third output end and the fourth output end are simultaneously connected with the over-voltage and under-voltage protection module and the output module.
6. The apparatus of claim 5, wherein the interference suppression module further comprises a fifth capacitor and a sixth capacitor, wherein an anode of the fifth capacitor is connected to the first output terminal, a cathode of the fifth capacitor is connected to ground, an anode of the sixth capacitor is connected to ground, and a cathode of the sixth capacitor is connected to the second output terminal.
7. The interference suppression and over-and-under-voltage protection device for precision instrument and equipment as claimed in claim 1 or 6, wherein the over-and-under-voltage protection module comprises a transformer, a rectifier bridge and an over-and-under-voltage protection unit, the over-and-under-voltage protection unit comprises a third resistor, a fourth resistor, a first thyristor, a second thyristor, a first potentiometer, a second potentiometer, a first relay and a second relay; the transformer is connected with a first alternating current end and a second alternating current end of the rectifier bridge, and a first direct current end of the rectifier bridge is connected to a second direct current end of the rectifier bridge through the third resistor and the fourth resistor;
a first end of the third resistor is connected with a coil input end of the first relay and a coil input end of the second relay, the second end of the third resistor is connected with the first end of the fourth resistor, the first end of the first potentiometer, the sliding end of the first potentiometer, the first end of the second potentiometer, the coil output end of the first relay and the input end of the first controlled silicon, the second end of the fourth resistor is connected with the output end of the first controlled silicon and the output end of the second controlled silicon, the control end of the first controlled silicon is connected with the second end of the first potentiometer, the control end of the second controlled silicon is connected with the second end of the second potentiometer and the sliding end of the second potentiometer, the input end of the second controlled silicon is connected with the coil output end of the second relay, and the normally closed contact of the first relay and the normally open contact of the second relay are arranged on the connecting lead of the interference suppression module and the output module.
8. The interference suppression and over-under-voltage protection device for a precision instrument and equipment of claim 7, wherein the over-under-voltage protection unit further comprises a first freewheeling diode connected in parallel with the coil of the first relay and a second freewheeling diode connected in parallel with the coil of the second relay.
9. The apparatus of claim 8, wherein the undervoltage protection unit further comprises a seventh capacitor and/or a reset button, the seventh capacitor is connected in parallel with the second freewheeling diode, and the reset button is connected in series to a connection line between the output terminal of the first thyristor and the second terminal of the fourth resistor.
10. The apparatus of claim 1, wherein the output module is a socket.
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| CN202210582332.XA CN115133745A (en) | 2022-05-26 | 2022-05-26 | Interference suppression and overvoltage and undervoltage protection device for precision instrument and equipment |
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| CN202210582332.XA CN115133745A (en) | 2022-05-26 | 2022-05-26 | Interference suppression and overvoltage and undervoltage protection device for precision instrument and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116527463A (en) * | 2023-06-26 | 2023-08-01 | 四川新川航空仪器有限责任公司 | Common mode interference signal suppression device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116527463A (en) * | 2023-06-26 | 2023-08-01 | 四川新川航空仪器有限责任公司 | Common mode interference signal suppression device and method |
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