CN210923819U - Conversion circuit - Google Patents
Conversion circuit Download PDFInfo
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- CN210923819U CN210923819U CN201920971469.8U CN201920971469U CN210923819U CN 210923819 U CN210923819 U CN 210923819U CN 201920971469 U CN201920971469 U CN 201920971469U CN 210923819 U CN210923819 U CN 210923819U
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Abstract
The utility model discloses a conversion circuit, its characterized in that: the transformer, the current-to-voltage module and the voltage-to-frequency module are sequentially connected, wherein the transformer is used for converting an input alternating current signal into an induced current, the current-to-voltage module is used for converting the induced current into a voltage, and the voltage-to-frequency module is used for converting the voltage into a frequency to be output; the conversion circuit of the utility model can be used for detecting alternating voltage, not only low-voltage alternating current but also high-voltage alternating current; in addition, the device can also be used for leakage detection and detecting alternating current leakage voltage or current of equipment; the conversion circuit converts the voltage into positive correlation frequency through conversion, the microcomputer can read the positive correlation frequency, particularly, the PLC can monitor the magnitude of the alternating voltage through reading the magnitude of the frequency, and the conversion circuit can be applied to severe industrial environments.
Description
Technical Field
The utility model relates to a conversion technology field especially relates to a conversion circuit.
Background
The existing voltage detection devices are of various types, and surge protectors are also called surge protectors, commonly called lightning arresters and mainly used for surge overvoltage protection of various power supply systems. When the detected circuit contains surge current, a surge protector can be added to protect the safety of the leakage detection device. However, the cost of the general surge protector is high, and the cost of the detection device is increased by adopting the method. In addition, the alternating current transformer detection circuit has the functions of measurement, display, analysis and the like; the existing transformer conversion circuit is various in shape and color, but most of the existing transformer conversion circuits are complex in structure and complex in function, and under the application occasions only needing single function, the complex conversion circuit is often adopted to detect the voltage or current of the circuit, so that the cost is improved on one hand, and on the other hand, once the circuit structure is complicated, the unstable factors behind the circuit structure are increased, so that the product qualification rate is reduced invisibly.
Under some severe environments, such as occasions of aluminum plants or steel plants, the traditional voltage or current detection device is difficult to detect the equipment voltage in real time under the severe environments, particularly, the traditional voltage or current detection device works on equipment of a three-phase power supply, and can generate alternating current due to the fact that alternating current high voltage is generated when electric leakage occurs. Therefore, a new conversion circuit is needed to convert the ac voltage into other signals for other devices to read.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a converting circuit for convert alternating voltage into frequency.
The technical scheme of the utility model is that: a conversion circuit comprises a mutual inductor, a current-to-voltage module and a voltage-to-frequency module, wherein the mutual inductor, the current-to-voltage module and the voltage-to-frequency module are sequentially connected, the mutual inductor is used for converting an input alternating current signal into an induced current, the current-to-voltage module converts the induced current into a voltage, and the voltage-to-frequency module converts the voltage into a frequency to be output.
Furthermore, the current-to-voltage module adopts a WB5812A type ac-to-dc voltage converter, the voltage-to-frequency module adopts an AD654 chip, a first end of an input end of the transformer is connected to an IN + end of the voltage to be measured, an IN-end of the voltage to be measured is connected to a second end of the input end of the transformer, one end of an output end of the transformer is connected to an I + end of the WB5812A type ac-to-dc voltage converter, the other end of the output end of the transformer is connected to an I-end of the WB5812A type ac-to-dc voltage converter, the I-end of the WB5812A type ac-to-dc voltage converter is further connected IN series to a second resistor to a Vz end of the WB58 5812A type ac-to-dc voltage converter, a Gnd end of the WB58 5812A type ac-to-dc voltage converter is grounded, a + E end of the WB58 5812A type ac-to-dc voltage converter is connected to a first power supply, a T end, the Rt end of the AD654 chip is grounded through a fifth resistor, the Lc end of the AD654 chip and the Lc end of the AD654 chip are grounded at the same time, the first Ct end of the AD654 chip is connected with the second Ct end of the AD654 chip through a third capacitor, and the AD654 chip + Vs is connected with a second power supply.
Furthermore, the conversion circuit further comprises a first capacitor, and the + E terminal of the WB5812A type ac/dc converter is grounded via the first capacitor.
Further, the conversion circuit further comprises a second capacitor, and the AD654 chip + Vs is grounded via the second capacitor.
Furthermore, a protection circuit is further arranged in front of the transformer in the conversion circuit, and the protection circuit comprises an overvoltage protection circuit.
Preferably, the overvoltage protection circuit includes a seventh resistor and a seventh capacitor, and the seventh resistor and the seventh capacitor are connected in series and then connected in parallel with the input end of the transformer.
Further, the above-mentioned conversion circuit also includes a sixth capacitor, and the sixth capacitor is connected in series between the input end of the transformer and the voltage to be measured.
Further, the conversion circuit further comprises a microcomputer, and the microcomputer is connected with the voltage-to-frequency conversion module and is used for reading the frequency.
Preferably, the microcomputer comprises a PLC or a single chip microcomputer, and the PLC is connected with the Fout end of the AD654 chip.
The utility model has the advantages that: the conversion circuit of the utility model can be used for detecting alternating voltage, not only low-voltage alternating current but also high-voltage alternating current; in addition, the device can also be used for leakage detection and detecting alternating current leakage voltage or current of equipment; the conversion circuit converts the voltage into positive correlation frequency through conversion, the microcomputer can read the positive correlation frequency, particularly, the PLC can monitor the magnitude of the alternating voltage through reading the magnitude of the frequency, and the conversion circuit can be applied to severe industrial environments.
Drawings
FIG. 1 is a schematic diagram of a first conversion circuit of the present invention
FIG. 2 is a circuit diagram of a first converting circuit of the present invention
FIG. 3 is a circuit diagram of a second leakage detecting circuit of the present invention
FIG. 4 is a circuit diagram of a third leakage detection circuit of the present invention
Reference numerals: the circuit comprises a current-limiting resistor R0, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a PT mutual inductor, a U1 WB58 5812A type alternating current and direct current voltage converter, a U2 AD654 chip, an IN + measured voltage first end, an IN-measured voltage second end, a VR2 adjustable resistor and a CN light emitting diode.
Detailed Description
The following describes an implementation structure of the present invention with reference to the drawings.
Example one
As shown IN fig. 1 and fig. 2, a conversion circuit includes a transformer PT, a WB5812A type ac-to-dc voltage converter U1 and an AD654 chip U2, wherein a first end of an input end of the transformer PT is connected to an IN + end of a voltage to be measured, the IN-end of the voltage to be measured is connected to a second end of the input end of the transformer PT, one end of an output end of the transformer PT is connected to an I + end of the WB 5838712 5812A type ac-to-dc voltage converter, the other end of the transformer PT is connected to an I-end of the WB58 5812A type ac-to-dc voltage converter, the I-end of the WB5812A type ac-to-dc voltage converter is further connected IN series to a second resistor R2 to a Vz end of the WB58 5812A type ac-to-dc voltage converter, the Gnd end of the WB5812A type ac-to ground, the terminal of the WB5812A type ac-to-dc voltage converter + E end of the first power supply source + 1, and the WB58 5812A type ac-to the AD654 chip U4 to, the Rt end of the AD654 chip is grounded through a fifth resistor R5, the Lc end of the AD654 chip and the Lc end of the AD654 chip are grounded at the same time, the first Ct end of the AD654 chip is connected with the second Ct end of the AD654 chip through a third capacitor C3, the AD654 chip + Vs is connected with a second power supply + Vs2, the Fout end of the AD654 chip is connected with the PLC, and the PLC can read the output frequency. The first power supply Vs1 is a WB5812A type ac current/dc voltage converter U1 suitable power input range, the second power supply Vs2 is an AD654 chip U2 suitable power input range, and the transformer PT is a voltage transformer, wherein the voltage-to-frequency module is an AD654 chip in this embodiment.
In order to better prevent the interference of the first power supply, a first capacitor C1 is added, and the + E terminal of the WB5812A type alternating current/direct current voltage converter is also grounded through the first capacitor C1.
In order to better prevent the interference of the first power supply, a second capacitor C2 is added, and the AD654 chip + Vs is grounded through a second capacitor C2.
The working principle is as follows:
the method comprises the steps that the IN + end of a measured voltage is connected with a measured device, the IN-end of the measured voltage is grounded, a complete input loop is connected into a transformer, when the measured device generates leakage alternating current voltage, the input end of the transformer generates current I1, the current I3578 is detected by the transformer and converted into induced current I2, the induced current I2 is transmitted into a WB5812A type alternating current direct current voltage converter U1, then the WB5812A type alternating current direct current voltage converter U1 converts the changed current into changed voltage, the changed voltage is transmitted into an AD654 chip Vin end, the AD654 chip U2 converts the changed voltage into changed frequency, the changed frequency is output from an AD654 chip Fout end, and finally the changed frequency is read by a PLC. The PLC is suitable for severe industrial environments, leakage alternating current voltage or leakage alternating current voltage can be detected in severe working environments by combining the circuit, the circuit is simple, the cost is low, and whether the equipment generates changed induction voltage or leakage voltage can be detected in real time.
Example two
As shown IN fig. 1 and fig. 3, a converting circuit includes a transformer PT, a WB5812A type ac-to-dc converter U1 and an AD654 chip U2, a first end of an input end of the transformer PT is connected to an IN + end of a voltage to be measured, the IN-end of the voltage to be measured is connected to a second end of the input end of the transformer PT, one end of an output end of the transformer PT is connected to an I + end of the WB5812A type ac-to-dc converter, the other end of the transformer PT is connected to an I-end of the WB5812A type ac-to-dc converter, the I-end of the WB 5838712 type ac-to-dc converter is further connected IN series to a second resistor R2 to a Vz end of the WB5812A type ac-to-dc converter, the Gnd end of the WB5812A type ac-to ground, the + E end of the WB 58A type ac-to-dc converter is connected to a first power supply source + Vs1, and the T end of the WB 58A type ac-to the AD654 chip 4, the Rt end of the AD654 chip is grounded through a fifth resistor R5, the Lc end of the AD654 chip and the Lc end of the AD654 chip are grounded at the same time, the first Ct end of the AD654 chip is connected with the second Ct end of the AD654 chip through a third capacitor C3, the AD654 chip + Vs is connected with a second power supply + Vs2, the Fout end of the AD654 chip is connected with the PLC, and the PLC can read the output frequency. The first power supply Vs1 is a WB5812A type ac current/dc voltage converter U1 suitable power input range, the second power supply Vs2 is an AD654 chip U2 suitable power input range, the transformer PT is a voltage transformer, and the voltage to frequency module is an AD654 chip in this embodiment.
In order to detect larger leakage voltage and prevent the transformer PT from being damaged by the excessive leakage voltage, a current protection circuit is added, and the current protection circuit comprises a current limiting resistor R0, wherein the current limiting resistor R0 is connected between the input end of the transformer and the voltage to be detected in series and is used for limiting the current at the input end of the transformer.
The leakage detection circuit further comprises a sixth capacitor, wherein the sixth capacitor is connected between the input end of the mutual inductor and the voltage to be detected in series, and the function is to prevent direct current offset and help to improve measurement accuracy.
In order to better prevent the interference of the first power supply, a first capacitor C1 is added, and the + E terminal of the WB5812A type alternating current/direct current voltage converter is also grounded through the first capacitor C1. In order to better prevent the interference of the first power supply, a second capacitor C2 is added, and the AD654 chip + Vs is grounded through a second capacitor C2.
Furthermore, the leakage detection circuit further comprises a variable resistor VR2, and the variable resistor VR2 is connected in series between the terminal Rt of the AD654 chip and the ground through a fifth resistor. Variable resistor VR2 can provide full scale current and sufficient tuning range to accommodate FS errors and component tolerances in the AD654 chip.
The working principle is as follows:
the method comprises the steps that the IN + end of a measured voltage is connected with a measured device, the IN-end of the measured voltage is connected with a zero line to form a complete input loop to be connected into a transformer, when the measured device generates leakage alternating current voltage, the input end of the transformer generates current I1, the current I1 is detected by the transformer and converted into induced current I2, the induced current I2 is transmitted into a WB5812A type alternating current and direct current voltage converter U1, then the WB5812A type alternating current and direct current voltage converter U1 converts the changed current into changed voltage and transmits the changed voltage to the Vin end of an AD654 chip, the AD654 chip U2 converts the changed voltage into changed frequency, the changed frequency is output from the Fout end of the AD654 chip, and finally the changed frequency is read by a PLC. Because PLC is applicable to among the abominable industrial environment, combine this circuit alright detect leakage voltage or detect alternating voltage in abominable operational environment, and this circuit is fairly simple, and is with low costs, can real-time detection equipment whether produce the induction voltage or the leakage voltage that change.
EXAMPLE III
As shown IN fig. 1 and fig. 4, a conversion circuit includes a transformer PT, a WB5812A type ac-to-dc converter U1 and an AD654 chip U2, a first end of an input terminal of the transformer PT is connected to an IN + terminal of a voltage to be measured, the IN-terminal of the voltage to be measured is connected to a second terminal of the input terminal of the transformer PT, one end of an output terminal of the transformer PT is connected to an I + terminal of the WB5812A type ac-to-dc converter, the other end of the transformer PT is connected to an I-terminal of the WB5812A type ac-to-dc converter, the I-terminal of the WB5812A type ac-to-dc converter is further connected IN series to a second resistor R2 to a Vz terminal of the WB5812A type ac-to-dc converter, a Gnd terminal of the WB5812A type ac-to ground, a T terminal of the WB5812A type ac-to-dc converter is connected to the AD chip terminal via a fourth resistor R4, and the AD654 chip rtvk 5 to ground via, an end Lc of the AD654 chip and an end Lc of the AD654 chip are grounded simultaneously, a first Ct end of the AD654 chip is connected to a second Ct end of the AD654 chip through a third capacitor C3, in order to enable a WB5812A ac/dc converter and a voltage conversion module to use the same power supply at the same time, a + E end of the WB5812A ac/dc converter is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to one end of a third resistor R3 and an end + Vs end of the AD654 chip, and the other end of the third resistor R3 is connected to an anode of the power supply (in this embodiment, a 24V power supply is used), wherein the voltage conversion frequency module is an AD654 chip in this embodiment, and the first resistor and the third resistor perform voltage division and current limitation functions, so that the WB58 5812A ac/dc converter and the AD654 chip operate within a normal voltage range. And the Fout end of the AD654 chip is connected with the PLC, and the PLC can read the output frequency. The mutual inductor PT adopts a TR-3121C voltage mutual inductor, in order to remind the power supply to be in the on-state, a prompt circuit is added, the prompt circuit comprises a light emitting diode CN and an eighth resistor R8, and the power supply, the light emitting diode CN, the eighth resistor R8 and the ground are connected in sequence.
In order to detect larger leakage voltage and prevent the circuit elements from being damaged by the excessive leakage voltage (or detection voltage), a current protection circuit is added, and the current protection circuit comprises a current limiting resistor R0, wherein the current limiting resistor R0 is connected between the input end of the mutual inductor and the detected voltage in series and is used for limiting the current at the input end of the mutual inductor.
The leakage detection circuit further comprises a sixth capacitor, wherein the sixth capacitor is connected between the input end of the mutual inductor and the voltage to be detected in series, and the function is to prevent direct current offset and help to improve measurement accuracy.
In order to detect larger leakage voltage and prevent the circuit element from being damaged by the overlarge leakage voltage (or detection voltage), the overvoltage protection circuit is added, and further comprises a seventh resistor and a seventh capacitor, wherein the seventh resistor and the seventh capacitor are connected in series and then connected in parallel with the input end of the mutual inductor, and the seventh resistor and the seventh capacitor are connected in series and then connected in parallel with the input end of the mutual inductor, so that Vin overvoltage can be inhibited, overvoltage protection is realized, and in addition, the function of absorbing and consuming self-induced electromotive force generated by the mutual inductor PT when the Vin is disconnected is realized.
In order to better prevent the interference of the first power supply, a first capacitor C1 is added, and the + E terminal of the WB5812A type alternating current/direct current voltage converter is also grounded through the first capacitor C1. In order to better prevent the interference of the first power supply, a second capacitor C2 is added, and the AD654 chip + Vs is grounded through a second capacitor C2.
Furthermore, the leakage detection circuit further comprises a variable resistor VR2, and the variable resistor VR2 is connected in series between the terminal Rt of the AD654 chip and the ground through a fifth resistor. Variable resistor VR2 can provide full scale current and sufficient tuning range to accommodate FS errors and component tolerances in the AD654 chip.
The working principle is as follows:
the method comprises the steps that an IN + end (or an IN-end) of a voltage to be measured is connected with a device to be measured, the IN-end (or the IN + end) of the voltage to be measured is connected with a zero line or a ground line to form a complete input loop, the input end (or the IN + end) of the voltage to be measured is connected into a transformer, when the device to be measured generates a leakage alternating current voltage, the input end of the transformer generates a current I1, the current I1 is detected by the transformer and converted into an induced current I2, the induced current I2 is transmitted into a WB5812A type alternating current and direct current voltage converter U1, then the WB5812A type alternating current and direct current voltage converter U1 converts the variable current into a variable voltage, the variable voltage is transmitted into an AD654 chip Vin end, then the AD654 chip U2 converts the variable voltage into variable frequency, the variable frequency is output from an AD654 chip Fout end, and finally the variable frequency. Because PLC is applicable to among the abominable industrial environment, combine this circuit alright detect the leakage voltage in abominable operational environment, and this circuit is fairly simple, and is with low costs, can real-time detection equipment whether produce the induced voltage or the leakage voltage that change, and can measure higher alternating current, still have overvoltage protection for this circuit life-span of electron is longer.
The above description is only a detailed description of the present invention. The scope of the present invention is not limited thereto, and any changes or simple substitutions which are not thought of through creative work should be covered within the scope of the present invention.
Claims (9)
1. A conversion circuit, characterized by: the transformer, the current-to-voltage module and the voltage-to-frequency module are sequentially connected, wherein the transformer is used for converting an input alternating current signal into an induced current, the current-to-voltage module converts the induced current into voltage, and the voltage-to-frequency module converts the voltage into frequency for output.
2. The conversion circuit of claim 1, wherein: the current-to-voltage conversion module adopts a WB5812A type alternating current-to-direct current voltage converter, the voltage-to-frequency conversion module adopts an AD654 chip, a first end of an input end of the transformer is connected with an IN + end of a voltage to be measured, an IN-end of the voltage to be measured is connected with a second end of the input end of the transformer, one end of an output end of the transformer is connected with an I + end of the WB5812A type alternating current-to-direct current voltage converter, the other end of the output end of the transformer is connected with an I-end of the WB5812A type alternating current-to-direct current voltage converter, the I-end of the WB5812A type alternating current-to-direct current voltage converter is also connected with a second resistor IN series to be connected with a Vz end of the WB5812A type alternating current-to-direct current voltage converter, a Gnd end of the WB5812A type alternating current-to be grounded, an E-end of, the Rt end of the AD654 chip is grounded through a fifth resistor, the Lc end of the AD654 chip and the Lc end of the AD654 chip are grounded at the same time, the first Ct end of the AD654 chip is connected with the second Ct end of the AD654 chip through a third capacitor, and the AD654 chip + Vs is connected with a second power supply.
3. The conversion circuit of claim 2, wherein: the WB5812A type alternating current and direct current voltage converter + E end is grounded through the first capacitor.
4. The conversion circuit of claim 2, wherein: the AD654 chip + Vs is grounded through the second capacitor.
5. A conversion circuit as claimed in claim 2, 3 or 4, characterized in that: and a protection circuit is arranged in front of the mutual inductor and comprises an overvoltage protection circuit.
6. The conversion circuit of claim 5, wherein: the overvoltage protection circuit comprises a seventh resistor and a seventh capacitor, wherein the seventh resistor and the seventh capacitor are connected in series and then connected in parallel with the input end of the mutual inductor.
7. A conversion circuit as claimed in claim 2, 3, 4 or 6, characterized in that: the voltage transformer further comprises a sixth capacitor, and the sixth capacitor is connected between the input end of the transformer and the voltage to be measured in series.
8. A conversion circuit as claimed in claim 2, 3, 4 or 6, characterized in that: the device also comprises a microcomputer, wherein the microcomputer is connected with the voltage-to-frequency module and is used for reading the frequency.
9. The conversion circuit of claim 8, wherein: the microcomputer comprises a PLC or a single chip microcomputer, and the PLC is connected with the Fout end of the AD654 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920971469.8U CN210923819U (en) | 2019-06-26 | 2019-06-26 | Conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920971469.8U CN210923819U (en) | 2019-06-26 | 2019-06-26 | Conversion circuit |
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| CN210923819U true CN210923819U (en) | 2020-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161302A (en) * | 2019-06-26 | 2019-08-23 | 广西盟创智慧科技有限公司 | A kind of conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161302A (en) * | 2019-06-26 | 2019-08-23 | 广西盟创智慧科技有限公司 | A kind of conversion circuit |
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