CN116600217A - Signal transmission system for direct-current voltage transformer - Google Patents
Signal transmission system for direct-current voltage transformer Download PDFInfo
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- CN116600217A CN116600217A CN202310613697.9A CN202310613697A CN116600217A CN 116600217 A CN116600217 A CN 116600217A CN 202310613697 A CN202310613697 A CN 202310613697A CN 116600217 A CN116600217 A CN 116600217A
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- H—ELECTRICITY
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- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
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Abstract
The invention discloses a signal transmission system for a direct-current voltage transformer, which comprises: a primary converter and a secondary side; the primary converter comprises a voltage-current conversion module, a first LED, a second LED and a first PIN; the secondary side comprises a second PIN and a current-voltage conversion module; the output end of the voltage-current conversion module is connected with the first LED and the second LED which are connected in series; the light emitting end of the second LED is connected with the first PIN receiving end through a first optical fiber; the first PIN is connected with the input end of the voltage-current conversion module; the light-emitting end of the first LED and the second PIN receiving end are connected through a second optical fiber; the lengths of the first optical fiber and the second optical fiber are the same; the second PIN is connected with the current-voltage conversion module; the first LED and the second LED are the same light-emitting diode; the first PIN and the second PIN are both identical photodiodes. The invention improves the nonlinear characteristics of the light emitting diode and the photodiode in the conversion process and realizes the linear optical fiber transmission of analog signals.
Description
Technical Field
The invention relates to the technical field of direct-current voltage transformers, in particular to a signal transmission system for a direct-current voltage transformer.
Background
The direct-current voltage transformer is used for metering and protecting the direct-current power distribution network and is one of important equipment of the direct-current power distribution network. The DC voltage transformer based on the principle of resistance-capacitance voltage division outputs a lower voltage signal proportional to the DC voltage to be measured at the low voltage side, and the lower voltage signal is processed at the ground potential side of the resistance-capacitance voltage divider and then transmitted to a secondary instrument through a cable. The voltage class of a dc distribution network is typically 10kV and below, and cables are preferred in view of transmission distance and overall cost. However, a voltage transformer in a direct-current power distribution network is usually installed in a direct-current power distribution cabinet, the interior of the cabinet is limited by space, installation equipment is more, a bus arrangement office is complex, the electromagnetic environment in the cabinet is severe, an output signal cable of the direct-current voltage transformer is very easy to interfere in the environment, and the electromagnetic interference resistance of the direct-current voltage transformer is weak when the direct-current voltage transformer adopts the cable to transmit an analog signal; in addition, the reference ground of the output voltage of the low-voltage arm of the resistor-capacitor voltage divider is a strong current ground and is commonly grounded with the weak current ground of the signal processing circuit, and a cable is adopted to transmit signals, so that the weak current ground of the secondary instrument side also needs to be commonly grounded with the strong current ground of the resistor-capacitor voltage divider side, and the noise risk and the safety risk of the secondary instrument are greatly increased.
Optical fiber transmission is an ideal mode for effectively resisting electromagnetic interference and isolating signals, and is widely applied to electronic transformers with high voltage levels. In the electronic transformer with high voltage level, the output of the sensor is converted into a digital signal after being processed in a primary converter and is transmitted remotely by using an optical fiber, but the mode is not suitable for being applied to the distribution network direct current voltage transformer, and the complexity of the distribution network direct current voltage transformer is increased by a digital optical fiber transmission mode. The linear characteristics of the light emitting diode and the photoelectric conversion diode are poor, so that the performance requirements of the transformer are not met, and the linear transmission of analog signals cannot be realized.
Disclosure of Invention
The invention provides a signal transmission system for a direct-current voltage transformer, which adopts two pairs of identical Light Emitting Diodes (LEDs) and photoelectric conversion diodes (PIN), wherein one pair is used for transmitting analog signals through optical fibers; the other pair is used for feeding back output signals, and the nonlinear characteristics of the light emitting diode and the photodiode in the conversion process are improved by utilizing a negative feedback linearization control strategy of a nonlinear system, so that linearization optical fiber transmission of analog signals is realized.
In order to achieve the above object, the present invention provides a signal transmission system for a direct current voltage transformer, comprising: a primary converter and a secondary side;
the primary converter comprises a voltage-current conversion module, a first LED, a second LED and a first PIN; the output end of the voltage-current conversion module is connected with the positive electrode of the first LED; the negative electrode of the first LED is connected with the positive electrode of the second LED; the cathode of the second LED is grounded; the light emitting end of the second LED and the first PIN receiving end are connected through a first optical fiber; the positive electrode and the negative electrode of the first PIN are connected with the input end of the voltage-current conversion module; taking the input end of the voltage-current conversion module as the input end of the primary converter; taking the light-emitting end of the second LED as the output end of the primary converter;
the secondary side comprises a second PIN and a current-voltage conversion module; the light emitting end of the first LED and the second PIN receiving end are connected through a second optical fiber; the lengths of the first optical fiber and the second optical fiber are the same; the positive electrode and the negative electrode of the second PIN are connected with the current-voltage conversion module; taking the second PIN receiving end as a secondary side input end; taking the output end of the current-voltage conversion module as the output end of the secondary side; the first LED and the second LED are the same light emitting diode; the first PIN and the second PIN are the same photoelectric conversion diode.
Further, the primary converter is specifically configured to: the input signal is input into a voltage-current conversion module after low-pass filtering, so that the voltage-current conversion module converts the voltage signal into a first current signal which is used as driving current of the first LED and the second LED to drive the first LED and the second LED to emit light;
the first optical signal sent by the first LED is transmitted to the secondary side through the second optical fiber; and a second optical signal sent by the second LED is transmitted to the first PIN through the first optical fiber to be subjected to photoelectric conversion, the received second optical signal is converted into a second current signal, and the second current signal is fed back to the input end of the voltage-current conversion module.
Further, the voltage-current conversion module specifically includes: a first transconductance amplifier, a plurality of resistive elements, and a plurality of capacitive elements;
the positive electrode of the first PIN is connected with the non-inverting input end of the first transconductance amplifier and grounded; the negative electrode of the first PIN, the inverting input end of the first transconductance amplifier and one end of the first resistor are connected, and the other end of the first resistor is connected with the input end of the voltage-current conversion module; the output end of the first transconductance amplifier is used as the output end of the voltage-current conversion module;
the first transconductance amplifier is configured to regulate drive currents of the first LED and the second LED such that an inverting input of the first transconductance amplifier is maintained at 0V.
Further, the first transconductance amplifier is configured to adjust driving currents of the first LED and the second LED, so that an inverting input terminal of the first transconductance amplifier is maintained at 0V, specifically:
when the input voltage of the input end of the voltage-current conversion module is increased, the voltage of the inverting input end of the first transconductance amplifier is increased, so that a first current signal of the output of the first transconductance amplifier is increased, and a second optical signal emitted by the second LED is driven to be increased;
when the first PIN receives the increased second optical signal, the output photocurrent of the first PIN is increased, and the voltage of the inverting input end of the first transconductance amplifier is reduced to 0V, so that the output photocurrent of the first PIN linearly changes along with the input voltage.
Further, the current-voltage conversion module specifically includes: a second transconductance amplifier and a feedback resistor;
one end of the feedback resistor is connected with the inverting input end of the second transconductance amplifier and the cathode of the second PIN; the positive electrode of the second PIN is connected with the positive input end of the second transconductance amplifier and grounded; the other end of the feedback resistor is connected with the output end of the second transconductance amplifier and is used as the output end of the current-voltage conversion module;
the output photocurrents of the first PIN and the second PIN are equal; the output photocurrent of the second PIN varies linearly with the input voltage; the second transconductance amplifier is used for converting output photocurrent of the second PIN into output voltage through a feedback resistor and outputting the output voltage through an output end of the second transconductance amplifier.
Further, the output terminal and the inverting input terminal of the first transconductance amplifier are connected through a first capacitor.
Further, the voltage-current conversion module further includes: a triode;
the output end of the first transconductance amplifier is connected with one end of a second resistor, and the other end of the second resistor and one end of a third resistor are connected with the grid electrode of the triode; one end of the fourth resistor is connected with the source electrode of the triode; the other end of the third resistor and the other end of the fourth resistor are connected with a first power supply; the drain electrode of the triode is connected with one end of the fifth resistor, the anode of the first LED and the cathode of the first diode; the other end of the fifth resistor is connected with a second power supply; the cathode of the first LED, the anode of the second LED, the anode of the first diode and the cathode of the second diode are connected; the cathode of the second LED is connected with the anode of the second diode and grounded.
Further, the output terminal and the inverting input terminal of the second transconductance amplifier are connected through a second capacitor.
Preferably, the invention uses two pairs of identical Light Emitting Diodes (LEDs) and photo-conversion diodes (PINs). The light emitting diode LED and the photoelectric conversion diode PIN are in signal transmission by using optical fibers with the same length; a pair of optical fibers for transmitting analog signals; and the other pair is used for feeding back the output signals of the voltage-current conversion module. The invention utilizes the negative feedback function in the primary converter to control the two photoelectric conversion diodes PIN to realize linear change along with the input signal; the nonlinear characteristic of the light emitting diode and the photodiode in the conversion process is improved by utilizing a negative feedback linearization control strategy of a nonlinear system, so that linearization optical fiber transmission of analog signals is realized.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a signal transmission system for a dc voltage transformer according to the present invention;
fig. 2 is a schematic structural diagram of another embodiment of a signal transmission system for a dc voltage transformer according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a signal transmission system for a dc voltage transformer according to an embodiment of the present invention includes: a primary converter and a secondary side;
the primary converter comprises a voltage-current conversion module, a first LED, a second LED and a first PIN; the output end of the voltage-current conversion module is connected with the positive electrode of the first LED; the negative electrode of the first LED is connected with the positive electrode of the second LED; the cathode of the second LED is grounded; the light emitting end of the second LED and the first PIN receiving end are connected through a first optical fiber; the positive electrode and the negative electrode of the first PIN are connected with the input end of the voltage-current conversion module; taking the input end of the voltage-current conversion module as the input end of the primary converter; taking the light-emitting end of the second LED as the output end of the primary converter;
the secondary side comprises a second PIN and a current-voltage conversion module; the light emitting end of the first LED and the second PIN receiving end are connected through a second optical fiber; the lengths of the first optical fiber and the second optical fiber are the same; the positive electrode and the negative electrode of the second PIN are connected with the current-voltage conversion module; taking the second PIN receiving end as a secondary side input end; taking the output end of the current-voltage conversion module as the output end of the secondary side; the first LED and the second LED are the same light emitting diode; the first PIN and the second PIN are the same photoelectric conversion diode.
In this embodiment, the primary converter is specifically configured to: the input signal is input into a voltage-current conversion module after low-pass filtering, so that the voltage-current conversion module converts the voltage signal into a first current signal which is used as driving current of the first LED and the second LED to drive the first LED and the second LED to emit light;
the first optical signal sent by the first LED is transmitted to the secondary side through the second optical fiber; and a second optical signal sent by the second LED is transmitted to the first PIN through the first optical fiber to be subjected to photoelectric conversion, the received second optical signal is converted into a second current signal, and the second current signal is fed back to the input end of the voltage-current conversion module.
In this embodiment, the voltage-current conversion module specifically includes: a first transconductance amplifier, a plurality of resistive elements, and a plurality of capacitive elements;
the positive electrode of the first PIN is connected with the non-inverting input end of the first transconductance amplifier and grounded; the negative electrode of the first PIN, the inverting input end of the first transconductance amplifier and one end of the first resistor are connected, and the other end of the first resistor is connected with the input end of the voltage-current conversion module; the output end of the first transconductance amplifier is used as the output end of the voltage-current conversion module;
the first transconductance amplifier is configured to regulate drive currents of the first LED and the second LED such that an inverting input of the first transconductance amplifier is maintained at 0V.
In this embodiment, the first transconductance amplifier is configured to adjust the driving currents of the first LED and the second LED, so that the inverting input terminal of the first transconductance amplifier is maintained at 0V, specifically:
when the input voltage of the input end of the voltage-current conversion module is increased, the voltage of the inverting input end of the first transconductance amplifier is increased, so that a first current signal of the output of the first transconductance amplifier is increased, and a second optical signal emitted by the second LED is driven to be increased;
when the first PIN receives the increased second optical signal, the output photocurrent of the first PIN is increased, and the voltage of the inverting input end of the first transconductance amplifier is reduced to 0V, so that the output photocurrent of the first PIN linearly changes along with the input voltage.
In this embodiment, the current-voltage conversion module specifically includes: a second transconductance amplifier and a feedback resistor;
one end of the feedback resistor is connected with the inverting input end of the second transconductance amplifier and the cathode of the second PIN; the positive electrode of the second PIN is connected with the positive input end of the second transconductance amplifier and grounded; the other end of the feedback resistor is connected with the output end of the second transconductance amplifier and is used as the output end of the current-voltage conversion module;
the output photocurrents of the first PIN and the second PIN are equal; the output photocurrent of the second PIN varies linearly with the input voltage; the second transconductance amplifier is used for converting output photocurrent of the second PIN into output voltage through a feedback resistor and outputting the output voltage through an output end of the second transconductance amplifier.
In this embodiment, the output terminal and the inverting input terminal of the first transconductance amplifier are connected through a first capacitor.
In this embodiment, the voltage-current conversion module further includes: a triode;
the output end of the first transconductance amplifier is connected with one end of a second resistor, and the other end of the second resistor and one end of a third resistor are connected with the grid electrode of the triode; one end of the fourth resistor is connected with the source electrode of the triode; the other end of the third resistor and the other end of the fourth resistor are connected with a first power supply; the drain electrode of the triode is connected with one end of the fifth resistor, the anode of the first LED and the cathode of the first diode; the other end of the fifth resistor is connected with a second power supply; the cathode of the first LED, the anode of the second LED, the anode of the first diode and the cathode of the second diode are connected; the cathode of the second LED is connected with the anode of the second diode and grounded.
In this embodiment, the output terminal and the inverting input terminal of the second transconductance amplifier are connected through a second capacitor.
For better illustrating the present embodiment, please refer to fig. 2, which is a preferred signal transmission system for a dc voltage transformer, comprising: a transmitting side (primary converter) and a receiving side (secondary side);
the transmitting side includes: a first transconductance amplifier U1, resistors R1-R5, a capacitor C1, a triode Q1, light emitting diodes LED1 and LED2, diodes D1 and D2, and a photo-conversion diode PIN2;
the output end of the first transconductance amplifier U1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 and one end of a third resistor R3 are connected with the grid electrode of the triode Q1; one end of the fourth resistor R4 is connected with the source electrode of the triode Q1; the other end of the third resistor R3 and the other end of the fourth resistor R4 are connected with a high-voltage power supply VCC 1; the drain electrode of the triode Q1 is connected with one end of a fifth resistor R5, the anode of the LED1 and the cathode of the first diode D1; the other end of the fifth resistor R5 is connected with a low-voltage power supply VDD 1; the cathode of the LED1, the anode of the LED2, the anode of the first diode D1 and the cathode of the second diode D2 are connected; the cathode of the LED2 is connected with the anode of the second diode D2 and grounded; the output of the first transconductance amplifier U1 is connected to the inverting input via a first capacitor C1.
The arrows in the figure indicate the current direction, and the photoelectric conversion of the PIN2 outputCurrent I PIN2 And voltage signal U at input in The current generated at R1 commonly flows into the inverting input of U1. U1 regulates the drive current of LED1 and LED2 (I F ) Thereby regulating the current I in PIN2 PIN2 So that the inverting input of U1 is held at 0V. When the input impedance of the inverting input terminal is large and approaches infinity, the input current of the inverting input terminal is close to zero. At this time, the following are satisfied:
I PIN2 ＝U in /R1； (1)
when the voltage U is input in When increasing, the inverting input voltage of U1 will tend to increase above 0V; at this time, the output of U1 will also increase, resulting in I F I PIN2 Increase, I PIN2 The process is repeated to pull back the inverting input of U1 by 0V, eventually bringing the inverting input of U1 to 0V. The feedback process causes I to PIN2 The photoelectric conversion currents of PIN1 and PIN2 are equal along with the linear change of the input voltage, namely the signal output after the optical fiber transmission also linearly changes along with the input voltage.
From formula (1), it can be seen that I after stabilization by feedback PIN2 Dependent only on input voltage U in And the value of R1, irrespective of the light output characteristics of the LED 2. When the light output of the LED2 has a non-linear characteristic, the first transconductance amplifier U1 adjusts I F To compensate and keep the current in PIN2 constant. Thus, I PIN2 And input voltage U in Proportional to the ratio.
The LED drive circuit formed by resistors such as the triodes Q1 and R2-R5 is beneficial to maintaining the precision and bandwidth of the circuit in the whole input voltage range. The diodes D1 and D2 protect the LEDs 1 and 2 from excessive reverse voltages when the LEDs are in a non-light emitting state.
The receiving side includes: a photoelectric conversion diode PIN1, a second transconductance amplifier U2, a second capacitor C2 and a feedback resistor R6;
one end of the feedback resistor R6 is connected with the inverting input end of the second transconductance amplifier U2 and the cathode of the PIN 1; the positive electrode of the PIN1 is connected with the positive input end of the second transconductance amplifier U2 and grounded; the other end of the feedback resistor R6 is connected with the output end of the second transconductance amplifier U2; the output end and the inverting input end of the second transconductance amplifier U2 are connected through a second capacitor C2; the second transconductance amplifier U2 is connected to a low-voltage power supply VDD2 and a high-voltage power supply VCC2;
because LED1 and LED2 are the same, PIN1 and PIN2 are the same, and LED1 and LED2 establish ties and are the same current drive, and both work in same environment, and PIN is connected through the optic fibre of same length to two LEDs, therefore, PIN2 and PIN 1's output photocurrent equals, consequently has:
I PIN2 ＝I PIN1 ＝U in /R1； (2)
it follows that the relationship between the output current of the photodiode PIN1 and the transmission side input voltage is also linear. Thus, by negative feedback linearization, the output of photodiode PIN1 is linear and stable. Thereby realizing the linear optical fiber transmission of the analog signals.
The second transconductance amplifier U2 converts the output current converted by PIN1 into a voltage signal U through a feedback resistor R6 out ：
As is clear from equation (3), the input voltage on the transmitting side is linearly transmitted to the receiving side through the optical fiber.
The capacitors C1 and C2 on the feedback branches of U1 and U2 are compensation capacitors, and the bandwidth of the circuit is limited within the signal transmission bandwidth, so that the noise of the circuit is reduced, and the working stability of the circuit is improved.
The implementation of the embodiment of the invention has the following effects:
the invention adopts two pairs of identical Light Emitting Diodes (LEDs) and photoelectric conversion diodes (PIN). The light emitting diode LED and the photoelectric conversion diode PIN are in signal transmission by using optical fibers with the same length; a pair of optical fibers for transmitting analog signals; and the other pair is used for feeding back the output signals of the voltage-current conversion module. The invention utilizes the negative feedback function in the primary converter to control the two photoelectric conversion diodes PIN to realize linear change along with the input signal; the nonlinear characteristic of the light emitting diode and the photodiode in the conversion process is improved by utilizing a negative feedback linearization control strategy of a nonlinear system, so that linearization optical fiber transmission of analog signals is realized.
Claims (8)
1. A signal transmission system for a dc voltage transformer, comprising: a primary converter and a secondary side;
the primary converter comprises a voltage-current conversion module, a first LED, a second LED and a first PIN; the output end of the voltage-current conversion module is connected with the positive electrode of the first LED; the negative electrode of the first LED is connected with the positive electrode of the second LED; the cathode of the second LED is grounded; the light emitting end of the second LED and the first PIN receiving end are connected through a first optical fiber; the positive electrode and the negative electrode of the first PIN are connected with the input end of the voltage-current conversion module; taking the input end of the voltage-current conversion module as the input end of the primary converter; taking the light-emitting end of the second LED as the output end of the primary converter;
the secondary side comprises a second PIN and a current-voltage conversion module; the light emitting end of the first LED and the second PIN receiving end are connected through a second optical fiber; the lengths of the first optical fiber and the second optical fiber are the same; the positive electrode and the negative electrode of the second PIN are connected with the current-voltage conversion module; taking the second PIN receiving end as a secondary side input end; taking the output end of the current-voltage conversion module as the output end of the secondary side; the first LED and the second LED are the same light emitting diode; the first PIN and the second PIN are the same photoelectric conversion diode.
2. A signal transmission system for a direct current voltage transformer according to claim 1, characterized in that the primary converter is adapted in particular for: the input signal is input into a voltage-current conversion module after low-pass filtering, so that the voltage-current conversion module converts the voltage signal into a first current signal which is used as driving current of the first LED and the second LED to drive the first LED and the second LED to emit light;
the first optical signal sent by the first LED is transmitted to the secondary side through the second optical fiber; and a second optical signal sent by the second LED is transmitted to the first PIN through the first optical fiber to be subjected to photoelectric conversion, the received second optical signal is converted into a second current signal, and the second current signal is fed back to the input end of the voltage-current conversion module.
3. The signal transmission system for a direct current voltage transformer according to claim 2, wherein the voltage-current conversion module specifically comprises: a first transconductance amplifier, a plurality of resistive elements, and a plurality of capacitive elements;
the positive electrode of the first PIN is connected with the non-inverting input end of the first transconductance amplifier and grounded; the negative electrode of the first PIN, the inverting input end of the first transconductance amplifier and one end of the first resistor are connected, and the other end of the first resistor is connected with the input end of the voltage-current conversion module; the output end of the first transconductance amplifier is used as the output end of the voltage-current conversion module;
the first transconductance amplifier is configured to regulate drive currents of the first LED and the second LED such that an inverting input of the first transconductance amplifier is maintained at 0V.
4. A signal transmission system for a dc voltage transformer according to claim 3, wherein the first transconductance amplifier is configured to regulate the driving currents of the first LED and the second LED such that the inverting input of the first transconductance amplifier is maintained at 0V, in particular:
when the input voltage of the input end of the voltage-current conversion module is increased, the voltage of the inverting input end of the first transconductance amplifier is increased, so that a first current signal of the output of the first transconductance amplifier is increased, and a second optical signal emitted by the second LED is driven to be increased;
when the first PIN receives the increased second optical signal, the output photocurrent of the first PIN is increased, and the voltage of the inverting input end of the first transconductance amplifier is reduced to 0V, so that the output photocurrent of the first PIN linearly changes along with the input voltage.
5. The signal transmission system for a direct current voltage transformer according to claim 4, wherein the current-voltage conversion module comprises: a second transconductance amplifier and a feedback resistor;
one end of the feedback resistor is connected with the inverting input end of the second transconductance amplifier and the cathode of the second PIN; the positive electrode of the second PIN is connected with the positive input end of the second transconductance amplifier and grounded; the other end of the feedback resistor is connected with the output end of the second transconductance amplifier and is used as the output end of the current-voltage conversion module;
the output photocurrents of the first PIN and the second PIN are equal; the output photocurrent of the second PIN varies linearly with the input voltage; the second transconductance amplifier is used for converting output photocurrent of the second PIN into output voltage through a feedback resistor and outputting the output voltage through an output end of the second transconductance amplifier.
6. A signal transmission system for a dc voltage transformer as claimed in claim 3 wherein the output and inverting input of the first transconductance amplifier are connected by a first capacitor.
7. A signal transmission system for a dc voltage transformer as claimed in claim 3, wherein said voltage to current conversion module further comprises: a triode;
the output end of the first transconductance amplifier is connected with one end of a second resistor, and the other end of the second resistor and one end of a third resistor are connected with the grid electrode of the triode; one end of the fourth resistor is connected with the source electrode of the triode; the other end of the third resistor and the other end of the fourth resistor are connected with a first power supply; the drain electrode of the triode is connected with one end of the fifth resistor, the anode of the first LED and the cathode of the first diode; the other end of the fifth resistor is connected with a second power supply; the cathode of the first LED, the anode of the second LED, the anode of the first diode and the cathode of the second diode are connected; the cathode of the second LED is connected with the anode of the second diode and grounded.
8. A signal transmission system for a direct current voltage transformer according to claim 5 wherein the output and inverting input of the second transconductance amplifier are connected by a second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310613697.9A CN116600217A (en) | 2023-05-26 | 2023-05-26 | Signal transmission system for direct-current voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310613697.9A CN116600217A (en) | 2023-05-26 | 2023-05-26 | Signal transmission system for direct-current voltage transformer |
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| Publication Number | Publication Date |
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| CN116600217A true CN116600217A (en) | 2023-08-15 |
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| CN202310613697.9A Pending CN116600217A (en) | 2023-05-26 | 2023-05-26 | Signal transmission system for direct-current voltage transformer |
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- 2023-05-26 CN CN202310613697.9A patent/CN116600217A/en active Pending
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