Optical current transformer and analog quantity output circuit

Abstract

The utility model discloses an optical current transformer and an analog quantity output circuit thereof. The circuit is provided with an input plug connector, an output plug connector and at least one signal conversion assembly. The input plug connector comprises a measurement result pin and a control pin, the input plug connector is connected with an optical measurement control board card in the optical current transformer, the measurement result pin is connected with a digital quantity output interface of the optical measurement control board card, and the control pin is connected with a control signal output interface of the measurement control board card. The signal conversion assembly comprises a digital-to-analog conversion chip, the digital-to-analog conversion chip is respectively connected with the measurement result pin and the control pin, and the digital-to-analog conversion chip is used for carrying out digital-to-analog conversion on the digital quantity measurement result according to the control of the optical measurement control board card. And the output plug connector is connected with the signal conversion assembly, so that multi-channel analog quantity output of the measurement result of the optical transformer is realized, the requirement of a user on analog quantity output and the requirement on simultaneous multi-purpose of the measurement result are met, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronic devices, especially relates to an optical current transformer and analog output circuit. BACKGROUND

[0002] Optical Current Transformer (OCT) is a new type of current measurement device based on optical principles, which uses Faraday magneto-optic effect to measure current. With the continuous improvement of the intelligence and automation level of the power system, the requirements of various industries for current measurement devices are also getting higher and higher. As a new type of current measurement device, the optical current transformer has many advantages that cannot be compared with traditional electromagnetic current transformers, and has broad development prospects.

[0003] The optical measurement control board card of the optical current transformer can output the measurement results of digital quantity externally, however, this single type of measurement result output mode cannot meet the needs of users for analog quantity measurement results. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of optical current transformer and analog output electric, to meet the needs of user to analog output and result simultaneously multiple, improve the user's use experience.

[0005] According to an aspect of the utility model, an analog output circuit of an optical current transformer is provided, which comprises: an input connector, an output connector and at least one signal conversion component.

[0006] The input connector comprises a measurement result pin and a control pin, and the input connector is connected to an optical measurement control board card in the optical current transformer, wherein the measurement result pin is connected to a digital quantity output interface of the optical measurement control board card, and the control pin is connected to a control signal output interface of the measurement control board card.

[0007] The signal conversion component comprises a digital-to-analog conversion chip, which is connected to the measurement result pin and the control pin respectively, and the digital-to-analog conversion chip is used to convert the digital quantity measurement results provided by the optical measurement control board card into analog quantity measurement results according to the control of the control signal of the optical measurement control board card.

[0008] The output connector is connected to the signal conversion component and is used to provide analog quantity measurement results externally.

[0009] Optionally, the signal conversion component further comprises an operational amplifier, which is arranged between the output pin of the digital-to-analog conversion chip and the output connector and outputs voltage-type analog quantity measurement results to the output connector.

[0010] Optionally, the signal conversion assembly further comprises a voltage-to-current conversion chip, which is arranged between the output pin of the digital-to-analog conversion chip and the output connector, and outputs a current-type analog measurement result to the output connector.

[0011] Optionally, the input connector further comprises a power supply pin, which is connected with a power output interface of the measurement control board card.

[0012] The analog output circuit further comprises a power conversion assembly corresponding to the signal conversion assembly.

[0013] The power conversion assembly is connected with the power supply pin, and converts the power supply provided by the measurement control board card into power supply voltages of different levels, which are supplied to the power-consuming devices in the corresponding signal conversion assembly.

[0014] Optionally, the power conversion assembly comprises an isolated dual-output DC conversion chip, an input end of the isolated dual-output DC conversion chip is connected with the power supply pin, and a first output end and a second output end of the isolated dual-output DC conversion chip are respectively connected with the corresponding signal conversion assembly, so as to provide the power-consuming devices in the signal conversion assembly with first voltage and second voltage which are mutually isolated, wherein the voltage values of the first voltage and the second voltage are equal but the polarities are opposite.

[0015] Optionally, the power conversion assembly further comprises a first low-dropout linear voltage stabilizer chip and a second low-dropout linear voltage stabilizer chip.

[0016] An input end of the first low-dropout linear voltage stabilizer chip is connected with the first output end of the isolated dual-output DC converter, and an output end of the first low-dropout linear voltage stabilizer chip is connected with the corresponding signal conversion assembly, so as to provide the power-consuming devices in the signal conversion assembly with third voltage, wherein the polarity of the third voltage is the same as that of the first voltage but the voltage value is smaller than that of the first voltage.

[0017] An input end of the second low-dropout linear voltage stabilizer chip is connected with the second output end of the isolated dual-output DC converter, and a first output end and a second output end of the second low-dropout linear voltage stabilizer chip are respectively connected with the corresponding signal conversion assembly, so as to provide the power-consuming devices in the signal conversion assembly with fourth voltage and fifth voltage, wherein the polarity of the fourth voltage is the same as that of the second voltage but the voltage value is smaller than that of the second voltage, and the polarity of the fifth voltage is the same as that of the fourth voltage but the voltage value is smaller than that of the fourth voltage.

[0018] Optionally, the signal conversion assembly further comprises an isolation circuit, which is arranged between the input connector and the digital-to-analog conversion chip.

[0019] Optionally, the input connector is a 96-pin connector in accordance with DIN 41612 Type-C standard.

[0020] Optionally, the number of signal conversion assemblies is five.

[0021] According to another aspect of the present application, an optical current transformer is provided, which comprises an optical measurement control board card and two analog output circuits of the previous aspect, wherein the output connector of one of the analog output circuits outputs a voltage type analog measurement result, and the corresponding signal conversion assembly does not comprise a voltage-current conversion chip; the output connector of the other of the analog output circuits outputs a current type analog measurement result, and the corresponding signal conversion assembly comprises a voltage-current conversion chip.

[0022] The optical current transformer and the analog output circuit thereof provided by the present application are provided with an input connector, an output connector and at least one signal conversion assembly. The input connector comprises a measurement result pin and a control pin, and the input connector is connected to the optical measurement control board card in the optical current transformer, wherein the measurement result pin is connected to the digital output interface of the optical measurement control board card, and the control pin is connected to the control signal output interface of the measurement control board card. The signal conversion assembly comprises a digital-analog conversion chip, which is connected to the measurement result pin and the control pin respectively, and is used to convert the digital measurement result provided by the optical measurement control board card into an analog measurement result according to the control of the control signal of the optical measurement control board card. The output connector is connected to the signal conversion assembly, and is used to provide an analog measurement result externally, thereby realizing the multi-channel analog output of the measurement result of the optical current transformer, meeting the demand of the user for the analog output, and meeting the demand of the user for the simultaneous use of the measurement result, thereby improving the use experience of the user.

[0023] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1The utility model provides a kind of analog output circuit of optical current transformer of the component schematic diagram provided for the embodiment of the utility model;

[0026] Figure 2 The utility model provides another kind of analog output circuit of optical current transformer of the component schematic diagram provided for the embodiment of the utility model;

[0027] Figure 3 The utility model provides a kind of circuit schematic diagram of signal conversion component provided for the embodiment of the utility model;

[0028] Figure 4 The utility model provides another kind of analog output circuit of optical current transformer of the component schematic diagram;

[0029] Figure 5 The utility model provides another kind of analog output circuit of optical current transformer of the component schematic diagram;

[0030] Figure 6 The utility model provides a kind of circuit schematic diagram of power conversion component provided for the utility model;

[0031] Figure 7 The utility model provides another kind of analog output circuit of optical current transformer of the component schematic diagram;

[0032] Figure 8 The utility model provides a kind of circuit schematic diagram of voltage current conversion chip and its surrounding circuit provided for the embodiment of the present application;

[0033] Figure 9 The utility model provides a kind of component schematic diagram of optical current transformer provided for the utility model. DETAILED DESCRIPTION

[0034] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the scope of the protection of the utility model.

[0035] It should be noted that the terms "first", "second", and the like in the description and claims of the utility model and the above drawings are used to distinguish like objects, and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the utility model described herein can be carried out in other than the order shown or described herein. Furthermore, the terms "comprising" and "including" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a list of steps or units not necessarily limited to those explicitly listed, but can include other steps or units not expressly listed or inherent to such processes, methods, products, or apparatus.

[0036] In order to solve the problems mentioned in the background, the utility model provides an analog output circuit of optical current transformer. Figure 1 The utility model provides a kind of analog output circuit of optical current transformer of the component schematic diagram of the embodiment of the utility model, refer to Figure 1 Analog output circuit 100 of optical current transformer includes input connector 101, output connector 102 and at least one signal conversion component 103 (for example, analog output circuit 100 includes five signal conversion components 103 in the drawing). Input connector 101 includes measurement result pin a and control pin b, and input connector 101 is connected with optical measurement control board card in optical current transformer, wherein measurement result pin a is connected with digital output interface of optical measurement control board card, and control pin b is connected with control signal output interface of measurement control board card. Signal conversion component 103 includes digital-analog conversion chip 104, and digital-analog conversion chip 104 is connected with measurement result pin a and control pin b respectively, and digital-analog conversion chip 104 is used for carrying out digital-analog conversion to digital quantity measurement result provided by optical measurement control board card according to the control of the control signal of optical measurement control board card. Output connector 102 is connected with signal conversion component 103, and is used to provide analog measurement result externally.

[0037] Specifically, analog output circuit 100 is connected with the optical measurement control board card of optical current transformer, and its logic control is from FPGA on optical measurement control board card. Optical measurement control board card is the core board card of optical current transformer, also called OCT10 single board, can demodulate optical signal and carry out specific algorithm operation, realizes the measurement of external alternating current or direct current, and realizes the external sending of current measurement signal and state signal through optical communication port, and exemplarily, OCT10 single board can include Xilinx ZYNC-7000 series chip, and optical communication port can include 60044-8 or 9-2LE optical communication port. However, the current measurement signal and state signal output by optical measurement control board card are single digital signal, and do not meet the application demand of analog signal for user.

[0038] The analog output circuit 100 is an analog output board card of the optical current transformer, which is connected with the backboard of the optical measurement control board card. The circuit on the board card can convert the digital signal output by the optical measurement control board card into an analog signal and supply the user equipment.

[0039] The input connector 101 is a digital signal input connector in the analog output circuit 100, which is used to connect with the backboard of the optical measurement control board card. The input connector 101 can access the digital measurement results and control signals output by the optical measurement control board card. The input connector 101 can include multiple pins, each of which can be connected to different areas on the backboard of the optical measurement control board card to realize the access of different signals. For example, the input connector 101 can be a 96-pin backboard connector conforming to the DIN 41612 Type C standard, and the model can be HARTING 09732966801.

[0040] The output connector 102 is a connector in the analog output circuit 100, which is used to realize signal connection with the user equipment. The number of signal output pins of the output connector 102 can be related or equal to the number of signal conversion components 103, so as to realize independent output of the analog signals generated by each signal conversion component 103. The model and type of the output connector 102 can correspond to the corresponding interface of the user equipment.

[0041] The signal conversion component 103 is a digital-to-analog conversion component arranged between the input connector 101 and the output connector 102. The signal conversion component 103 can convert the digital measurement results into corresponding analog measurement results according to the control of the FPGA in the optical measurement control board card. The signal conversion component 103 includes a digital-to-analog conversion chip 104, which is used to convert the digital measurement results into analog measurement results. For example, the digital-to-analog conversion chip 104 can be a 16-bit voltage output digital-to-analog converter chip, which is used to convert the digital measurement results into analog voltage signals. For example, the model of the digital-to-analog conversion chip 104 can be LTC2642-16. Multiple signal conversion components 103 can be arranged in the analog output circuit 100, which are respectively connected between the input connector 101 and the output connector 102 to realize multi-channel conversion and output of the analog test signals. For example, five signal conversion components 103 can be included in a single analog output circuit 100 to realize simultaneous output of five analog measurement results.

[0042] The analog output circuit of the optical current transformer provided by the embodiment is provided with an input connector, an output connector and at least one signal conversion component. The input connector comprises a measurement result pin and a control pin, and the input connector is connected with a light measurement control board card in the optical current transformer, wherein the measurement result pin is connected with a digital output interface of the light measurement control board card, and the control pin is connected with a control signal output interface of the measurement control board card. The signal conversion component comprises a digital-to-analog conversion chip, and the digital-to-analog conversion chip is connected with the measurement result pin and the control pin respectively, and the digital-to-analog conversion chip is used for carrying out digital-to-analog conversion on the digital measurement result provided by the light measurement control board card according to the control of the control signal of the light measurement control board card. The output connector is connected with the signal conversion component, and is used for providing an analog measurement result externally, thereby realizing multi-channel analog output of the measurement result of the optical current transformer, meeting the demand of the user for the analog quantity, and the multi-channel output can meet the demand of the user for simultaneous multiple use of the measurement result, thereby improving the use experience of the user.

[0043] Optionally, Figure 2 The composition schematic diagram of another analog output circuit of an optical current transformer provided by the embodiment of the utility model is based on the foregoing embodiment, and the composition schematic diagram of the analog output circuit of the optical current transformer is as shown in the figure. Figure 2 The signal conversion component 103 further comprises an operational amplifier 201 and a voltage reference chip 202, the operational amplifier 201 is arranged between the output pin of the digital-to-analog conversion chip 104 and the output connector 102, and outputs a voltage type analog measurement result to the output connector 102. The input end of the voltage reference chip 202 can be connected with a power supply, and the output end of the voltage reference chip 202 is connected with the reference voltage pin of the digital-to-analog conversion chip 104, thereby providing a stable and reliable reference voltage for the digital-to-analog conversion chip 104.

[0044] Specifically, Figure 3 The circuit schematic diagram of the signal conversion component provided by the embodiment of the utility model is as shown in the figure. Figure 2 And Figure 3 The operational amplifier 201 is a signal operation device arranged between the digital-to-analog conversion chip 104 and the output connector 102, and can carry out operational amplification processing on the analog measurement result output by the digital-to-analog conversion chip 104 according to the demand of the user equipment. The voltage reference chip 202 is a voltage stabilizing chip for providing a reference voltage for the digital-to-analog conversion chip 104, and can generate a reference voltage with high stability and precision through specific circuit elements. The stable element in the voltage reference chip 202 can usually comprise a high-precision diode or a voltage stabilizing circuit, and can further comprise a feedback loop, and the feedback loop is used for continuously monitoring and comparing, and adjusting the circuit, so that the output voltage of the voltage reference chip 202 returns to a stable value.

[0045] Illustratively, the circuit schematic diagram of the signal conversion component is as shown in the figure. Figure 2 And Figure 3Operational amplifier 201 can be selected as model LT1678. Operational amplifier 201 is powered by +5V and -5V power supplies. The positive pin of operational amplifier 201 is connected to the V pin of digital-to-analog converter chip 104. out Pin connections: The inverting pin of operational amplifier 201 is connected to the INV pin and R pin of digital-to-analog converter chip 104, respectively. FB The operational amplifier 201 is connected to the output connector 102 to output the voltage-type analog measurement result. The voltage reference chip 202 can be a model LT1019CS8-2.5. The input pin IN of the voltage reference chip 202 is connected to a 5V DC power supply, and the output pin OUT of the voltage reference chip 202 provides a reference voltage V to the digital-to-analog converter chip 104. REF In the diagram, multiple grounding terminals (GND) are grounded. The power supply pin V of the digital-to-analog converter chip 104... DD It can be connected to a 5V or 3V DC power supply. The CS pin, SCLK pin, DIN pin and CLR pin of the digital-to-analog converter chip 104 can be connected to the FPGA of the optical measurement control board through the input connector 101, so that the digital-to-analog converter chip 104 is controlled by the optical measurement control board.

[0046] The analog output circuit of the optical current transformer provided in this embodiment includes an operational amplifier and a voltage reference chip in its signal conversion component. The operational amplifier is positioned between the output pin of the digital-to-analog converter chip and the output connector, outputting the voltage-type analog measurement result to the output connector. The input terminal of the voltage reference chip can be connected to a power supply, and the output terminal of the voltage reference chip is connected to the reference voltage pin of the digital-to-analog converter chip, providing a stable and reliable reference voltage for the digital-to-analog converter chip. This achieves adaptive operational amplification of the voltage-type analog measurement result, making it more suitable for user needs and further improving the user experience.

[0047] Optionally, Figure 4 This is a schematic diagram of the analog output circuit of another optical current transformer provided by this utility model. Based on the aforementioned embodiments, referencing... Figure 4 The signal conversion component 103 also includes an isolation circuit 401, which is disposed between the input connector 101 and the digital-to-analog converter chip 104.

[0048] Specifically, the isolation circuit 401 is an electronic circuit used to achieve signal isolation, which can isolate the front-end optical path from the back-end circuit. The isolation circuit 401 isolates the circuit after the isolation circuit in the signal conversion component 103 from the optical measurement and control board, preventing the electrical signals of the back-end user equipment and digital-to-analog converter from affecting the front-end optical measurement and control board, thereby improving the anti-interference capability and safety of the optical current transformer.

[0049] Optionally, Figure 5 The utility model provides a kind of analog output circuit of optical current transformer of still another component schematic view of the utility model, Figure 6 The utility model provides a kind of circuit schematic view of power conversion component, on the basis of preceding embodiment, in combination with Figure 5 Figure 6 The input plug connector 101 further includes a power supply pin c connected with the power output interface of the measurement control board card. The analog output circuit 100 further includes a power conversion component 501 corresponding to the signal conversion component 103. The power conversion component 501 is connected with the power supply pin c, converts the power supply provided by the measurement control board card into power supply voltages of different levels, and supplies to each power-consuming device in the corresponding signal conversion component 103.

[0050] Specifically, the power conversion assembly 501 comprises an isolated dual-output DC conversion chip 601, an input end d of the isolated dual-output DC conversion chip 601 is connected with the power supply pin c, and a first output end e and a second output end f of the isolated dual-output DC conversion chip 601 can be connected with corresponding signal conversion assemblies 103 respectively to provide mutually isolated first voltage and second voltage for electric devices in the signal conversion assemblies 103, wherein the voltage values of the first voltage and the second voltage are equal but the polarities are opposite, and exemplarily, in the case that the voltage input into the power supply pin c is 6V, the first voltage and the second voltage can be-12V and 12V respectively. The power conversion assembly 501 further comprises a first low-dropout linear voltage regulator chip 602 and a second low-dropout linear voltage regulator chip 603. An input end g of the first low-dropout linear voltage regulator chip 602 is connected with the first output end e of the isolated dual-output DC converter 601, and an output end i of the first low-dropout linear voltage regulator chip 602 is connected with the corresponding signal conversion assembly 103 to provide third voltage for electric devices in the signal conversion assembly 103, wherein the polarity of the third voltage is the same as that of the first voltage but the voltage value is less than that of the first voltage, and exemplarily, the third voltage can be-10V. An input end h of the second low-dropout linear voltage regulator chip 603 is connected with the second output end f of the isolated dual-output DC converter 601, and a first output end j and a second output end k of the second low-dropout linear voltage regulator chip 603 are connected with the corresponding signal conversion assembly 103 respectively to provide fourth voltage and fifth voltage for electric devices in the signal conversion assembly 103, wherein the polarity of the fourth voltage is the same as that of the second voltage but the voltage value is less than that of the second voltage, and the polarity of the fifth voltage is the same as that of the fourth voltage but the voltage value is less than that of the fourth voltage, and exemplarily, the fourth voltage can be 10V and the fifth voltage can be 5V. The power conversion assembly 501 realizes five levels of voltage supply of the first voltage, the second voltage, the third voltage, the fourth voltage and the fifth voltage, can cover the power consumption demand and reference voltage demand of all devices and chips in the analog quantity output circuit 100, and improves the power supply stability of the analog quantity output circuit 100.

[0051] In the above embodiments, the measurement results output by the analog quantity output circuit of the optical current transformer are all voltage-type analog quantity measurement results, which are essentially analog voltage signals, but in some application scenarios, many user devices cannot directly apply analog voltage signals but need analog current signals. Based on this, the utility model also provides another analog quantity output circuit of an optical current transformer, which can output current-type analog quantity measurement results. Figure 7 The composition schematic diagram of another analog quantity output circuit of an optical current transformer provided by the utility model is shown in FIG. 6, which is based on the foregoing embodiments and with reference to Figure 7The signal conversion assembly 103 further comprises a voltage-to-current conversion chip 701, which is arranged between the output pin of the digital-to-analog conversion chip 104 and the output connector 102, and outputs a current-mode analog measurement result to the output connector 102.

[0052] Specifically, the voltage-to-current conversion chip 701 is an integrated circuit chip capable of converting an input voltage signal into an output current signal. The voltage-to-current conversion chip 701 can comprise a V / I conversion circuit based on an operational amplifier 201, which converts the input voltage signal into the output current signal through a feedback network by utilizing the characteristics of the operational amplifier 201. The output current of the operational amplifier 201 is proportional to the input voltage, and by adjusting the parameters of the feedback network, different voltage-to-current conversion ratios can be achieved. For example, the V / I conversion circuit based on the operational amplifier 201 can be composed of one operational amplifier 201, one resistor and one transistor. The input voltage signal is applied to the non-inverting input terminal of the operational amplifier 201. The output terminal of the operational amplifier 201 is connected to the base of the transistor through the resistor. The emitter of the transistor is grounded, and the collector provides the output current as the output terminal. The voltage-to-current conversion chip 701 can also comprise a conversion chip based on a special V / I circuit. Such a conversion chip usually has internal circuit modules such as reference voltage source, amplifier, feedback network, etc., and can automatically adjust the output current to maintain a proportional relationship with the input voltage. For example, AD694 is a commonly used voltage-to-current conversion chip 701, which can convert an input 0-10V voltage signal into a 4-20mA output current signal, and has the advantages of high precision, low offset and high linearity.

[0053] Figure 8 The circuit schematic diagram of the voltage-to-current conversion chip and the peripheral circuit thereof provided by the embodiment of the present application is combined with Figure 7 and Figure 8 The two input pins VIN and SET of the voltage-to-current conversion chip 701 are connected to the output pin of the digital-to-analog conversion chip 104 or the output terminal of the operational amplifier 201 connected to the digital-to-analog conversion chip 104. Figure 7The voltage-current conversion chip 701 is connected with the output end of the operational amplifier 201 of the digital-analog conversion chip 104, and the voltage type analog measurement result is accessed.

[0054] The utility model embodiment further provides an optical current transformer. Figure 9 The utility model provides a kind of optical current transformer's composition schematic view for the utility model, on the basis of preceding embodiment, refer to Figure 9 The optical current transformer 900 includes an optical measurement control board card 901 and two analog output circuits 100, wherein the output connector of one analog output circuit 100 outputs the voltage type analog measurement result, and the corresponding signal conversion component does not include a voltage-current conversion chip. The output connector of the other analog output circuit 100 outputs the current type analog measurement result, and the corresponding signal conversion component includes a voltage-current conversion chip.

[0055] The utility model provides an optical current transformer and its analog output circuit, which are provided with an input connector, an output connector and at least one signal conversion component. The input connector includes a measurement result pin and a control pin, and is connected to the optical measurement control board card in the optical current transformer. The measurement result pin is connected to the digital output interface of the optical measurement control board card, and the control pin is connected to the control signal output interface of the measurement control board card. The signal conversion component includes a digital-analog conversion chip, which is connected to the measurement result pin and the control pin respectively. The digital-analog conversion chip is used to convert the digital measurement result provided by the optical measurement control board card into an analog signal according to the control of the control signal of the optical measurement control board card. The output connector is connected to the signal conversion component and is used to provide the analog measurement result externally, realizing the multi-channel analog output of the measurement result of the optical current transformer and meeting the demand of the user for analog quantity. The multi-channel output can meet the demand of the user for simultaneous use of the measurement result, improving the user's experience.

[0056] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An analog output circuit of an optical current transformer, characterized by comprising: The application relates to an analog output circuit of an optical current transformer. The analog output circuit comprises an input connector, an output connector and at least one signal conversion component. The input connector comprises a measurement result pin and a control pin, and is connected with an optical measurement control board card in the optical current transformer. The measurement result pin is connected with a digital output interface of the optical measurement control board card, and the control pin is connected with a control signal output interface of the measurement control board card. The signal conversion component comprises a digital-analog conversion chip, which is connected with the measurement result pin and the control pin respectively.

2. The analog output circuit of the optical current transformer according to claim 1, characterized by The digital-analog conversion chip is used for carrying out digital-analog conversion on a digital measurement result provided by the optical measurement control board card under the control of a control signal of the optical measurement control board card.

3. The analog output circuit of the optical current transformer according to claim 2, characterized in that, The output connector is connected with the signal conversion component and is used for providing an analog measurement result externally.

4. The analog output circuit of the optical current transformer according to claim 1, characterized by, The signal conversion component further comprises an operational amplifier, which is arranged between an output pin of the digital-analog conversion chip and the output connector and outputs a voltage-type analog measurement result to the output connector. The signal conversion component further comprises a voltage-current conversion chip, which is arranged between the output pin of the digital-analog conversion chip and the output connector and outputs a current-type analog measurement result to the output connector. The input connector further comprises a power supply pin, which is connected with a power supply output interface of the measurement control board card.

5. The analog output circuit of the optical current transformer according to claim 4, characterized in that, The analog output circuit further comprises a power supply conversion component corresponding to the signal conversion component.

6. The analog output circuit of the optical current transformer according to claim 5, characterized in that, The power supply conversion component is connected with the power supply pin, converts a power supply provided by the measurement control board card into power supply voltages of different levels, and supplies the power supply voltages to each power-consuming device in the corresponding signal conversion component. The power supply conversion component comprises an isolated double-output direct-current conversion chip, an input end of the isolated double-output direct-current conversion chip is connected with the power supply pin, a first output end and a second output end of the isolated double-output direct-current conversion chip are connected with the corresponding signal conversion component respectively, and the isolated double-output direct-current conversion chip provides mutually isolated first and second voltages for the power-consuming devices in the signal conversion component. The first and second voltages have equal voltage values but opposite polarities. The power supply conversion component further comprises a first low-voltage-difference linear voltage stabilizing chip and a second low-voltage-difference linear voltage stabilizing chip. An input end of the first low-voltage-difference linear voltage stabilizing chip is connected with the first output end of the isolated double-output direct-current conversion chip, an output end of the first low-voltage-difference linear voltage stabilizing chip is connected with the corresponding signal conversion component, and the first low-voltage-difference linear voltage stabilizing chip provides a third voltage for the power-consuming devices in the signal conversion component. The third voltage has the same polarity as the first voltage but a voltage value smaller than that of the first voltage. A second low-dropout linear voltage regulator chip is connected to the second output terminal of the isolated dual-output DC conversion chip, and the first output terminal and the second output terminal of the second low-dropout linear voltage regulator chip are respectively connected to the corresponding signal conversion assemblies to provide fourth voltage and fifth voltage for the electrical devices in the signal conversion assemblies, wherein the polarity of the fourth voltage is the same as that of the second voltage, but the voltage value is less than that of the second voltage, and the polarity of the fifth voltage is the same as that of the fourth voltage, but the voltage value is less than that of the fourth voltage.

7. The analog output circuit of an optical current transformer according to any one of claims 1 to 6, characterized in that, The signal conversion assembly further comprises an isolation circuit arranged between the input connector and the digital-to-analog conversion chip.

8. The analog output circuit of the optical current transformer according to any one of claims 1 to 6, characterized in that, The input connector is a 96-pin connector conforming to the DIN 41612 Type-C standard.

9. The analog output circuit of an optical current transformer according to any one of claims 1 to 6, characterized in that, The number of the signal conversion assemblies is five.

10. An optical current transformer, characterized by Comprise: an optical measurement control board card and two analog output circuits according to any one of claims 1-9, wherein the output connector of one of the analog output circuits outputs voltage-type analog measurement results, and the corresponding signal conversion assembly does not comprise a voltage-current conversion chip; and the output connector of the other analog output circuit outputs current-type analog measurement results, and the corresponding signal conversion assembly comprises a voltage-current conversion chip.

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