CN116455381A - Device for converting single-ended signal into differential signal - Google Patents
Device for converting single-ended signal into differential signal Download PDFInfo
- Publication number
- CN116455381A CN116455381A CN202310329563.4A CN202310329563A CN116455381A CN 116455381 A CN116455381 A CN 116455381A CN 202310329563 A CN202310329563 A CN 202310329563A CN 116455381 A CN116455381 A CN 116455381A
- Authority
- CN
- China
- Prior art keywords
- input port
- output port
- signal
- module
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002955 isolation Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 64
- 239000011324 bead Substances 0.000 claims description 44
- 239000003990 capacitor Substances 0.000 claims description 38
- 230000001052 transient effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000008054 signal transmission Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 12
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 101000777293 Homo sapiens Serine/threonine-protein kinase Chk1 Proteins 0.000 description 1
- 102100031081 Serine/threonine-protein kinase Chk1 Human genes 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
- H03K19/017536—Interface arrangements using opto-electronic devices
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Amplifiers (AREA)
Abstract
The device comprises an optical coupler module, a first-side circuit, a second-side circuit, a first-side circuit and a second-side circuit, wherein the optical coupler module is used for controlling the first-side circuit to be connected and disconnected when the first-side circuit is connected and disconnected; the pull-up module is arranged to provide a first power supply voltage signal to the positive input port of the optocoupler module; the switch module is arranged to receive an input signal and control the primary circuit to be turned on or turned off; the first voltage division module is arranged to output a first voltage signal at a first node when the secondary circuit is on and to output a second voltage signal when the secondary circuit is off; the first node is used as a first output signal end of the differential signal; the second voltage division module is arranged to output a third voltage signal at the second node when the secondary side circuit is on, and to output a fourth voltage signal at the second node when the secondary side circuit is off; the second node is used as a second output signal end of the differential signal. The device can realize single-ended signal to differential signal and signal isolation between the input signal and the back-end transmission system, and widens the frequency range of signal transmission.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a device for converting a single-ended signal into a differential signal.
Background
Single-ended signals are transmitted using only one signal line, the voltage at each point on the signal line being relative to ground. At long distances, the ground plane potentials at different locations may differ, which results in signal errors, i.e. instability factors. In addition, there may be interference signals, so that the anti-interference capability of the single-ended signal is poor.
The differential signal is transmitted by using two signal wires, and the voltage amplitude of each point on the two signal wires is the same and the directions are opposite. In long distance transmission, if the ground level potential at a certain point is floated or common mode interference signals are added, the errors act on two signal lines in the same direction at the same time, but the errors are counteracted by the subtraction operation, namely the interference is well resisted, because the final differential signals are subjected to the subtraction operation.
Therefore, single-ended signals are simple to implement and low in cost, but have poor anti-interference capability in the signal transmission process. And the differential signal has strong anti-interference capability and can effectively inhibit electromagnetic interference. In many practical situations, a single-ended signal needs to be converted into a differential signal, which requires a circuit that can convert the single-ended signal into the differential signal, i.e., a single-ended-to-differential circuit. In the related art, the single-ended to differential circuit includes a balun circuit form and an operational amplifier form. Balun is a passive device, signal conversion can be achieved through mutual coupling of induction coils, but the circuit is not suitable for low-frequency conditions, and certain loss exists in balun. An operational amplifier is an active device that itself has an amplifying effect on a signal, but peripheral circuits are complicated.
Disclosure of Invention
In a first aspect, the present application provides an apparatus for converting a single-ended signal to a differential signal, including: the device comprises an optocoupler module, a pull-up module, a switch module, a first voltage dividing module and a second voltage dividing module;
the optocoupler module comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a positive input port and a negative input port, and the secondary side circuit comprises a positive output port and a negative output port; the optocoupler module is arranged to control the secondary side circuit to be conducted when the primary side circuit is conducted, and control the secondary side circuit to be disconnected when the primary side circuit is disconnected;
the pull-up module is arranged to provide a first power supply voltage signal to a positive input port of the optocoupler module;
the switch module is used for receiving an input signal and switching on or switching off a primary side circuit of the optocoupler module under the control of the input signal;
the first voltage division module is used for dividing the voltage difference between the second power supply voltage signal end and the positive output port of the optical coupler module, outputting a first voltage signal at a first node when the secondary side circuit of the optical coupler module is conducted, and outputting a second voltage signal at the first node when the secondary side circuit of the optical coupler module is disconnected; the first node is used as a first output signal end of the differential signal;
The second voltage division module is used for dividing the voltage difference between the negative output port of the optocoupler module and the isolation ground, outputting a third voltage signal at a second node when the secondary side circuit of the optocoupler module is conducted, and outputting a fourth voltage signal at the second node when the secondary side circuit of the optocoupler module is disconnected; the second node is used as a second output signal end of the differential signal.
According to the device for converting the single-ended signal into the differential signal, the switching module is used for switching on or switching off the primary side circuit of the optical coupler module under the control of the input signal, the secondary side circuit is controlled to be switched on when the primary side circuit of the optical coupler module is switched on, the first voltage dividing module outputs a first voltage signal at a first node, and the second voltage dividing module outputs a third voltage signal at a second node; when the primary side circuit of the optocoupler module is disconnected, the secondary side circuit is controlled to be disconnected, the first voltage dividing module outputs a second voltage signal at a first node, the second voltage dividing module outputs a fourth voltage signal at a second node, and the first node and the second node serve as a first output signal end and a second output signal end of the differential signal respectively to provide the differential signal. The device for converting the single-ended signal into the differential signal realizes the signal isolation between the input signal and the rear-end transmission system, is suitable for transmitting signals in various frequency bands (high frequency, intermediate frequency and low frequency), and widens the frequency range of signal transmission.
Drawings
The accompanying drawings are included to provide an understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.
Fig. 1 is a schematic diagram of an apparatus for converting single-ended signals into differential signals according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a device for converting single-ended signals into differential signals according to an embodiment of the present application;
fig. 3 is an equivalent circuit diagram of a secondary circuit of an optocoupler module, a first voltage dividing module and a second voltage dividing module provided in an embodiment of the present application;
FIG. 4 is a voltage waveform diagram of an input signal and a differential signal according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another apparatus for single-ended signal to differential signal conversion (including a protection module) according to an embodiment of the present application;
fig. 6-1 is a schematic diagram of a protection module (including a differential mode interference filtering unit) according to an embodiment of the present application;
fig. 6-2 is a schematic diagram of a protection module (including a hf interference filtering unit) according to an embodiment of the present application;
fig. 6-3 are schematic diagrams of a protection module (including an i/f unit) according to an embodiment of the present application;
Fig. 6-4 are schematic diagrams of a protection module (including a first overvoltage protection unit) according to an embodiment of the present application;
fig. 6-5 are schematic diagrams of a protection module (including a second overvoltage protection unit) according to an embodiment of the present application;
fig. 7 is a schematic structural diagram (including five units) of a protection module according to an embodiment of the present application; .
Fig. 8 is a schematic circuit diagram (including five units) of a protection module according to an embodiment of the present application.
Detailed Description
The present application describes a number of embodiments, but the description is illustrative and not limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements of the present disclosure may also be combined with any conventional features or elements to form a unique inventive arrangement as defined in the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Unless otherwise defined, technical or scientific terms used in the disclosure of the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As shown in fig. 1, an apparatus for converting a single-ended signal into a differential signal according to an embodiment of the present application includes: the device comprises an optocoupler module 1, a pull-up module 2, a switch module 3, a first voltage dividing module 4 and a second voltage dividing module 5;
the optocoupler module comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a positive input port IN+ and a negative input port IN-, and the secondary side circuit comprises a positive output port OUT+ and a negative output port OUT-; the optocoupler module is arranged to control the secondary side circuit to be conducted when the primary side circuit is conducted, and control the secondary side circuit to be disconnected when the primary side circuit is disconnected;
the pull-up module is configured to provide a first power supply voltage signal VDD1 to a positive input port in+ of the optocoupler module;
the switch module is arranged to receive an input signal Vin and to switch on or off a primary side circuit of the optocoupler module under the control of the input signal;
the first voltage division module is used for dividing the voltage difference between the end of the second power supply voltage signal VDD2 and the positive output port OUT+ of the optocoupler module, outputting a first voltage signal at a first node N1 when the secondary side circuit of the optocoupler module is conducted, and outputting a second voltage signal at the first node N1 when the secondary side circuit of the optocoupler module is disconnected; the first node is used as a first output signal Vout1 end of the differential signal;
The second voltage division module is arranged for dividing the voltage difference between the negative output port OUT-of the optocoupler module and the isolation ground, outputting a third voltage signal at a second node N2 when the secondary side circuit of the optocoupler module is conducted, and outputting a fourth voltage signal at the second node N2 when the secondary side circuit of the optocoupler module is disconnected; the second node is used as a second output signal Vout2 end of the differential signal.
In the device for converting single-ended signals into differential signals provided in the above embodiment, the switch module switches on or off the primary side circuit of the optocoupler module under the control of the input signal, and when the primary side circuit of the optocoupler module is switched on, the secondary side circuit is controlled to be switched on, the first voltage dividing module outputs a first voltage signal at the first node, and the second voltage dividing module outputs a third voltage signal at the second node; when the primary side circuit of the optocoupler module is disconnected, the secondary side circuit is controlled to be disconnected, the first voltage dividing module outputs a second voltage signal at a first node, the second voltage dividing module outputs a fourth voltage signal at a second node, and the first node and the second node serve as a first output signal end and a second output signal end of the differential signal respectively to provide the differential signal. The device for converting the single-ended signal into the differential signal realizes the signal isolation between the input signal and the rear-end transmission system, is suitable for transmitting signals in various frequency bands (high frequency, intermediate frequency and low frequency), and widens the frequency range of signal transmission.
In the above embodiment, the optocoupler module plays a role in signal transmission isolation, where the signal ground refers to the reference ground of the circuit signal on the input side (primary side portion) of the optocoupler module, and the isolated ground refers to the reference ground of the circuit signal on the output side (secondary side portion) of the optocoupler module.
In an exemplary embodiment, as shown in fig. 2, the optocoupler module is a four-port device including primary and secondary side circuits. The primary side circuit includes a positive input port in+, a light emitter (such as a light emitting diode D1), and a negative input port IN-; the positive pole of the light emitting diode is connected with the positive input port IN+, and the negative pole of the light emitting diode is connected with the negative input port IN-. The secondary side circuit includes a positive output port OUT +, a light receiver (e.g., phototransistor Q1), and a negative output port OUT-. The collector of the phototriode is connected with the positive output port OUT+, the emitter of the phototriode is connected with the negative output port OUT-, and the base of the phototriode is used as a light receiving window. When the illumination intensity is changed, the phototriode can control the magnitude of the collector current according to the illumination intensity. When the current path between the positive input port IN+ and the negative input port IN-of the primary side circuit is conducted, the light emitting diode emits light, and the photoelectric triode of the secondary side circuit receives light to generate photocurrent to conduct the current path between the positive output port OUT+ and the negative output port OUT-, so that 'electro-optical-electrical' control is realized. And the primary side circuit and the secondary side circuit of the optical coupler module are electrically isolated, so that signal isolation between an input signal and a rear-end transmission system is realized.
IN an exemplary embodiment, as shown IN fig. 2, the pull-up module includes a first resistor R1, a first end of the first resistor is connected to the first power signal VDD1 end, and a second end of the first resistor is connected to the positive input port in+ of the optocoupler module.
In an exemplary embodiment, as shown in fig. 2, the switching module includes: a second resistor R2, a third resistor R3, and a second transistor Q2; the first end of the second resistor is connected with the input signal Vin end, and the second end of the second resistor is connected with the grid electrode of the second transistor Q2; the first end of the third resistor is connected with the grid electrode of the second transistor Q2, and the second end of the third resistor is connected with signal ground; the drain electrode of the second transistor is connected with a negative input port IN-of the optocoupler module, and the source electrode of the second transistor is connected with signal ground; the second transistor is an N-type field effect transistor.
When the input signal is a high-level signal (the voltage value exceeds the threshold voltage of the second transistor), the second transistor is conducted, the light emitting diode of the primary side circuit of the optocoupler module is conducted to emit a light signal, the phototriode of the secondary side circuit of the optocoupler module receives the light signal to generate photocurrent, and the secondary side circuit is conducted. When the input signal is a low-level signal (the voltage value does not exceed the threshold voltage of the second transistor), the second transistor is turned off, the light emitting diode of the primary side circuit of the optocoupler module is not turned on, the phototriode of the secondary side circuit of the optocoupler module cannot receive the optical signal, and the secondary side circuit is turned off.
In an exemplary embodiment, as shown in fig. 2, the first voltage dividing module includes a fourth resistor R4 and a fifth resistor R5; the first end of the fourth resistor is connected with the end of the second power supply signal VDD2, and the second end of the fourth resistor is connected with the first node N1; and a first end of the fifth resistor is connected with the first node N1, and a second end of the fifth resistor is connected with a positive output port OUT+ of the optocoupler module.
In an exemplary embodiment, as shown in fig. 2, the second voltage dividing module includes a sixth resistor R6 and a seventh resistor R7; the first end of the sixth resistor is connected with a negative output port OUT-of the optocoupler module, and the second end of the sixth resistor is connected with a second node N2; and the first end of the seventh resistor is connected with the second node N2, and the second end of the seventh resistor is connected with the isolation ground.
In an exemplary embodiment, as shown in fig. 3, the optocoupler module is equivalent to a switch S1, and the first node N1 and the second node N2 are two output terminals Vout1 and Vout2 of the differential circuit, respectively. When the secondary circuit of the optocoupler module is on, the switch S1 is closed, and when the secondary circuit of the optocoupler module is off, the switch S1 is opened.
Assume that the second power voltage provided by the second power voltage signal terminal is U VDD2 The resistance values of the 4 resistors R4, R5, R6 and R7 are respectively: r4, r5, r6 and r7.
When the voltage value U of the input signal Vin When the secondary side circuit of the optocoupler module is disconnected at a low level, the voltage U of the first node N1 The method comprises the following steps:
U N1 ＝U VDD2 (1)
voltage U of the second node N2 The method comprises the following steps:
U N2 ＝0 (2)
voltage value U of differential signal DIF Is the difference between the voltage value of the first node and the voltage value of the second node:
U DIF ＝U N1 -U N2 ＝U VDD2 (3)
when the voltage value U of the input signal Vin When the secondary side circuit of the optocoupler module is conducted at a high level, the voltage U of the first node N1 The method comprises the following steps:
voltage U of the second node N2 The method comprises the following steps:
in an exemplary embodiment, the second supply voltage U is provided that the resistance values of the 4 resistors R4, R5, R6 and R7 are equal VDD2 =5v. When the voltage value U of the input signal Vin At low level, U N1 ＝5V，U N2 ＝0V，U DIF =5v. When the voltage value U of the input signal Vin At a high level, U N1 ＝3.75V，U N2 ＝1.25V，U DIF =2.5v. FIG. 4 shows voltage waveforms of an input signal and a differential signal, wherein two output signals U of the differential signal N1 And U N2 The voltages of which have the same amplitude and opposite phases.
In an exemplary embodiment, as shown in fig. 5, the apparatus for converting a single-ended signal into a differential signal may further include: a protection module 6;
The protection module is configured to perform at least one of the following signal protection processes on signals of the first node and the second node: filtering out differential mode interference, filtering out high frequency interference, filtering out common mode interference and overvoltage protection.
In an exemplary embodiment, as shown in fig. 6-1, the protection module includes a differential mode interference filtering unit 61;
the differential mode interference filtering unit comprises: a first input port A1, a first magnetic bead FB1, a first output port A2, a second input port A3, a second magnetic bead FB2, and a second output port A4;
the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
the first input port is used for receiving a first input signal, the second input port is used for receiving a second input signal, the first output port is used for outputting a processed first input signal, and the second output port is used for outputting a processed second input signal.
The magnetic beads have very high resistivity and permeability, which are equivalent to series connection of a resistor and an inductor, but the resistance value and the inductance value are changed along with the frequency. The magnetic beads have excellent electromagnetic interference suppression performance. The first magnetic beads are used for filtering differential mode interference signals in the first input signals; the second magnetic beads are used for filtering differential mode interference signals in the second input signals.
In an exemplary embodiment, the first and second magnetic beads may be patch magnetic beads.
In an exemplary embodiment, as shown in fig. 6-2, the protection module includes a high frequency interference filtering unit 62;
the high-frequency interference filtering unit comprises: a first input port B1, a first capacitor C1, a first output port B2, a second input port B3, a second capacitor C2, a second output port B4, and an eighth resistor R8;
a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
the first input port is used for receiving a first input signal, the second input port is used for receiving a second input signal, the first output port is used for outputting a processed first input signal, and the second output port is used for outputting a processed second input signal; the first input port is connected with the first output port, and the second input port is connected with the second output port.
The first capacitor is used for filtering high-frequency interference signals in the first input signal; the second capacitor is used for filtering high-frequency interference signals in the second input signals; the eighth resistor is used for load matching.
In an exemplary embodiment, as shown in fig. 6-3, the protection module includes a common mode interference filtering unit 63;
the common mode interference filtering unit comprises: a first input port E1, a common mode inductance CHK1, a first output port E2, a second input port E3, and a second output port E4;
a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
the first input port is used for receiving a first input signal, the second input port is used for receiving a second input signal, the first output port is used for outputting a processed first input signal, and the second output port is used for outputting a processed second input signal.
The common mode inductor is used for filtering common mode interference signals in the first input signal and the second input signal.
In an exemplary embodiment, as shown in fig. 6-4, the protection module includes a first overvoltage protection unit 64;
the first overvoltage protection unit includes: a first input port F1, a first TVS (Transient Voltage Suppressor, transient voltage suppression diode) tube D1, a first output port F2, a second input port F3, a second TVS tube D2, a second output port F4, and a third TVS tube D3;
a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
the first input port is used for receiving a first input signal, the second input port is used for receiving a second input signal, the first output port is used for outputting a processed first input signal, and the second output port is used for outputting a processed second input signal; the first input port is connected with the first output port, and the second input port is connected with the second output port.
The TVS tube is similar to the common voltage stabilizing diode in working principle, if the voltage is higher than the breakdown voltage of the TVS tube, the TVS tube is conducted, and compared with the voltage stabilizing diode, the TVS tube has higher current conducting capacity. When the two poles of the TVS tube are impacted by reverse transient high energy, the two poles are impacted by 10 -12 The magnitude speed of S changes the high resistance between the two poles into low resistance, and absorbs the surge power of thousands of watts at the same time, so that the voltage between the two poles is clamped at a safe value, and the precise components in the electronic circuit are effectively protected from being damaged by surge pulses.
In an exemplary embodiment, as shown in fig. 6-5, the protection module comprises a second overvoltage protection unit 65;
the second overvoltage protection unit includes: a first input port G1, a first thermistor TR1, a first output port G2, a second input port G3, a second thermistor TR2, and a second output port G4;
the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port;
the first input port is used for receiving a first input signal, the second input port is used for receiving a second input signal, the first output port is used for outputting a processed first input signal, and the second output port is used for outputting a processed second input signal.
The first magnetic beads are used for filtering differential mode interference signals in the first input signals; the second magnetic beads are used for filtering differential mode interference signals in the second input signals.
When the cable is transmitted in a long distance, surge and large voltage interference exist, and at the moment, the thermistor heats and the resistance is rapidly increased. The thermistor can prevent the damage of large voltage on the transmission line to the back-end electronic system, and the step-down processing is realized.
In an exemplary embodiment, the protection module 6 includes any one of the following units: a differential mode interference filtering unit 61, a high frequency interference filtering unit 62, a common mode interference filtering unit 63, a first overvoltage protection unit 64 and a second overvoltage protection unit 65;
the first input port of the unit of the protection module is connected with a first node, and the second input port of the unit of the protection module is connected with a second node;
the first output port of the unit of the protection module is used as a final first output signal Vout1 end of the differential signal, and the second output port of the unit of the protection module is used as a final second output signal Vout2 end of the differential signal;
the differential mode interference filtering unit comprises: a first input port, a first magnetic bead, a first output port, a second input port, a second magnetic bead, and a second output port; the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
The high-frequency interference filtering unit comprises: the first input port, the first capacitor C1, the first output port, the second input port, the second capacitor, the second output port and the eighth resistor; a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
the common mode interference filtering unit comprises: a first input port, a common mode inductance, a first output port, a second input port, and a second output port; a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
the first overvoltage protection unit includes: a first input port F1, a first transient voltage suppression diode TVS pipe, a first output port, a second input port, a second TVS pipe, a second output port, and a third TVS pipe; a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
The second overvoltage protection unit includes: a first input port, a first thermistor, a first output port, a second input port, a second thermistor, and a second output port; the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port.
In an exemplary embodiment, the protection module 6 comprises at least two units in series: a differential mode interference filtering unit 61, a high frequency interference filtering unit 62, a common mode interference filtering unit 63, a first overvoltage protection unit 64 and a second overvoltage protection unit 65;
a first input port of the first unit is connected with the first node, and a second input port of the first unit is connected with the second node;
all units are connected in series in sequence: the first output port of the former unit is connected with the first input port of the latter unit, and the second output port of the former unit is connected with the second input port of the latter unit;
the first output port of the last unit is used as a final first output signal Vout1 end of the differential signal, and the second output port of the last unit is used as a final second output signal Vout2 end of the differential signal;
The differential mode interference filtering unit comprises: a first input port, a first magnetic bead, a first output port, a second input port, a second magnetic bead, and a second output port; the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
the high-frequency interference filtering unit comprises: the first input port, the first capacitor C1, the first output port, the second input port, the second capacitor, the second output port and the eighth resistor; a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
the common mode interference filtering unit comprises: a first input port, a common mode inductance, a first output port, a second input port, and a second output port; a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
The first overvoltage protection unit includes: a first input port F1, a first transient voltage suppression diode TVS pipe, a first output port, a second input port, a second TVS pipe, a second output port, and a third TVS pipe; a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
the second overvoltage protection unit includes: a first input port, a first thermistor, a first output port, a second input port, a second thermistor, and a second output port; the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port.
In an exemplary embodiment, as shown in fig. 7 and 8, the protection module 6 includes: a differential mode interference filtering unit 61, a high frequency interference filtering unit 62, a common mode interference filtering unit 63, a first overvoltage protection unit 64 and a second overvoltage protection unit 65;
The first input port of the differential mode interference filtering unit is connected with a first node, and the second input port of the differential mode interference filtering unit is connected with a second node;
the differential mode interference filtering unit, the high-frequency interference filtering unit, the common mode interference filtering unit, the first overvoltage protection unit and the second overvoltage protection unit are sequentially connected in series: the first output port of the former unit is connected with the first input port of the latter unit, and the second output port of the former unit is connected with the second input port of the latter unit;
the first output port of the second overvoltage protection unit is used as a final first output signal Vout1 end of the differential signal, and the second output port of the second overvoltage protection unit is used as a final second output signal Vout2 end of the differential signal;
the differential mode interference filtering unit comprises: a first input port, a first magnetic bead, a first output port, a second input port, a second magnetic bead, and a second output port; the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
The high-frequency interference filtering unit comprises: the first input port, the first capacitor C1, the first output port, the second input port, the second capacitor, the second output port and the eighth resistor; a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
the common mode interference filtering unit comprises: a first input port, a common mode inductance, a first output port, a second input port, and a second output port; a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
the first overvoltage protection unit includes: a first input port F1, a first transient voltage suppression diode TVS pipe, a first output port, a second input port, a second TVS pipe, a second output port, and a third TVS pipe; a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
The second overvoltage protection unit includes: a first input port, a first thermistor, a first output port, a second input port, a second thermistor, and a second output port; the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port.
Although the embodiments disclosed in the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (10)
1. An apparatus for converting a single-ended signal to a differential signal, comprising: the device comprises an optocoupler module, a pull-up module, a switch module, a first voltage dividing module and a second voltage dividing module;
the optocoupler module comprises a primary side circuit and a secondary side circuit, wherein the primary side circuit comprises a positive input port and a negative input port, and the secondary side circuit comprises a positive output port and a negative output port; the optocoupler module is arranged to control the secondary side circuit to be conducted when the primary side circuit is conducted, and control the secondary side circuit to be disconnected when the primary side circuit is disconnected;
The pull-up module is arranged to provide a first power supply voltage signal to a positive input port of the optocoupler module;
the switch module is used for receiving an input signal and switching on or switching off a primary side circuit of the optocoupler module under the control of the input signal;
the first voltage division module is used for dividing the voltage difference between the second power supply voltage signal end and the positive output port of the optical coupler module, outputting a first voltage signal at a first node when the secondary side circuit of the optical coupler module is conducted, and outputting a second voltage signal at the first node when the secondary side circuit of the optical coupler module is disconnected; the first node is used as a first output signal end of the differential signal;
the second voltage division module is used for dividing the voltage difference between the negative output port of the optocoupler module and the isolation ground, outputting a third voltage signal at a second node when the secondary side circuit of the optocoupler module is conducted, and outputting a fourth voltage signal at the second node when the secondary side circuit of the optocoupler module is disconnected; the second node is used as a second output signal end of the differential signal.
2. The apparatus according to claim 1, wherein:
the optocoupler module comprises a primary side circuit and a secondary side circuit;
The primary side circuit comprises a positive input port, a light emitting diode and a negative input port; the positive electrode of the light emitting diode is connected with the positive input port, and the negative electrode of the light emitting diode is connected with the negative input port;
the secondary side circuit comprises a positive output port, a phototriode and a negative output port; the collector of the phototriode is connected with the positive output port, and the emitter of the phototriode is connected with the negative output port.
3. The apparatus according to claim 1, wherein:
the pull-up module comprises a first resistor, a first end of the first resistor is connected with a first power signal end, and a second end of the first resistor is connected with a positive input port of the optocoupler module.
4. The apparatus according to claim 1, wherein:
the switch module includes: a second resistor, a third resistor, and a second transistor; the first end of the second resistor is connected with the input signal end, and the second end of the second resistor is connected with the grid electrode of the second transistor; the first end of the third resistor is connected with the grid electrode of the second transistor, and the second end of the third resistor is connected with signal ground; the drain electrode of the second transistor is connected with the negative input port of the optocoupler module, and the source electrode of the second transistor is connected with signal ground; the second transistor is an N-type field effect transistor.
5. The apparatus according to claim 1, wherein:
the first voltage dividing module comprises a fourth resistor and a fifth resistor; the first end of the fourth resistor is connected with the second power supply signal end, and the second end of the fourth resistor is connected with the first node; and a first end of the fifth resistor is connected with the first node, and a second end of the fifth resistor is connected with a positive output port of the optocoupler module.
6. The apparatus according to claim 1, wherein:
the second voltage dividing module comprises a sixth resistor and a seventh resistor; the first end of the sixth resistor is connected with the negative output port of the optocoupler module, and the second end of the sixth resistor is connected with the second node; and the first end of the seventh resistor is connected with the second node, and the second end of the seventh resistor is connected with the isolation ground.
7. The apparatus according to claim 1, wherein:
the device for converting single-ended signals into differential signals can further comprise: a protection module;
the protection module is configured to perform at least one of the following signal protection processes on signals of the first node and the second node: filtering out differential mode interference, filtering out high frequency interference, filtering out common mode interference and overvoltage protection.
8. The apparatus according to claim 7, wherein:
The protection module comprises any one of the following units: the device comprises a differential mode interference filtering unit, a high-frequency interference filtering unit, a common mode interference filtering unit, a first overvoltage protection unit and a second overvoltage protection unit;
the first input port of the unit of the protection module is connected with a first node, and the second input port of the unit of the protection module is connected with a second node;
the first output port of the unit of the protection module is used as a final first output signal end of the differential signal, and the second output port of the unit of the protection module is used as a final second output signal end of the differential signal;
the differential mode interference filtering unit comprises: a first input port, a first magnetic bead, a first output port, a second input port, a second magnetic bead, and a second output port; the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
the high-frequency interference filtering unit comprises: the first input port, the first capacitor C1, the first output port, the second input port, the second capacitor, the second output port and the eighth resistor; a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
The common mode interference filtering unit comprises: a first input port, a common mode inductance, a first output port, a second input port, and a second output port; a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
the first overvoltage protection unit includes: a first input port F1, a first transient voltage suppression diode TVS pipe, a first output port, a second input port, a second TVS pipe, a second output port, and a third TVS pipe; a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
the second overvoltage protection unit includes: a first input port, a first thermistor, a first output port, a second input port, a second thermistor, and a second output port; the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port.
9. The apparatus according to claim 7, wherein:
the protection module comprises at least two units connected in series: the device comprises a differential mode interference filtering unit, a high-frequency interference filtering unit, a common mode interference filtering unit, a first overvoltage protection unit and a second overvoltage protection unit;
a first input port of the first unit is connected with the first node, and a second input port of the first unit is connected with the second node;
all units are connected in series in sequence: the first output port of the former unit is connected with the first input port of the latter unit, and the second output port of the former unit is connected with the second input port of the latter unit;
the first output port of the last unit is used as a final first output signal end of the differential signal, and the second output port of the last unit is used as a final second output signal end of the differential signal;
the differential mode interference filtering unit comprises: a first input port, a first magnetic bead, a first output port, a second input port, a second magnetic bead, and a second output port; the first end of the first magnetic bead is connected with the first input port, and the second end of the first magnetic bead is connected with the first output port; the first end of the second magnetic bead is connected with the second input port, and the second end of the second magnetic bead is connected with the second output port;
The high-frequency interference filtering unit comprises: the first input port, the first capacitor C1, the first output port, the second input port, the second capacitor, the second output port and the eighth resistor; a first end of the first capacitor is connected with the first input port, and a second end of the first capacitor is connected with the isolation ground; the first end of the second capacitor is connected with the second input port, and the second end of the second capacitor is connected with the isolation ground; the first end of the eighth resistor is connected with the first input port, and the second end of the eighth resistor is connected with the second input port;
the common mode interference filtering unit comprises: a first input port, a common mode inductance, a first output port, a second input port, and a second output port; a first end of a first coil of the common-mode inductor is connected with a first input port, and a second end of the first coil of the common-mode inductor is connected with a first output port; the first end of the second coil of the common-mode inductor is connected with the second input port, and the second end of the second coil of the common-mode inductor is connected with the second output port;
the first overvoltage protection unit includes: a first input port F1, a first transient voltage suppression diode TVS pipe, a first output port, a second input port, a second TVS pipe, a second output port, and a third TVS pipe; a first end of the first TVS tube is connected with a first input port, and a second end of the first TVS tube is connected with an isolated ground; the first end of the second TVS tube is connected with the first input port, and the second end of the second TVS tube is connected with the second input port; the first end of the third TVS tube is connected with the second input port, and the second end of the third TVS tube is connected with the isolation ground;
The second overvoltage protection unit includes: a first input port, a first thermistor, a first output port, a second input port, a second thermistor, and a second output port; the first end of the first thermistor is connected with the first input port, and the second end of the first thermistor is connected with the first output port; the first end of the second thermistor is connected with the second input port, and the second end of the second thermistor is connected with the second output port.
10. The apparatus according to claim 9, wherein:
the protection module includes: the device comprises a differential mode interference filtering unit, a high-frequency interference filtering unit, a common mode interference filtering unit, a first overvoltage protection unit and a second overvoltage protection unit;
the first input port of the differential mode interference filtering unit is connected with a first node, and the second input port of the differential mode interference filtering unit is connected with a second node;
the differential mode interference filtering unit, the high-frequency interference filtering unit, the common mode interference filtering unit, the first overvoltage protection unit and the second overvoltage protection unit are sequentially connected in series: the first output port of the former unit is connected with the first input port of the latter unit, and the second output port of the former unit is connected with the second input port of the latter unit;
The first output port of the second overvoltage protection unit is used as a final first output signal end of the differential signal, and the second output port of the second overvoltage protection unit is used as a final second output signal end of the differential signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310329563.4A CN116455381A (en) | 2023-03-30 | 2023-03-30 | Device for converting single-ended signal into differential signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310329563.4A CN116455381A (en) | 2023-03-30 | 2023-03-30 | Device for converting single-ended signal into differential signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116455381A true CN116455381A (en) | 2023-07-18 |
Family
ID=87129546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310329563.4A Pending CN116455381A (en) | 2023-03-30 | 2023-03-30 | Device for converting single-ended signal into differential signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116455381A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4218748C1 (en) * | 1992-06-04 | 1993-10-21 | Licentia Gmbh | Transmission circuitry for rectangular signals over long transmission path - has pair of twisted conductors respectively coupled at input end to collector and emitter of output transistor of optical coupler receiving signal, and conductors coupled at output by respective ohmic resistors |
| WO2013166885A1 (en) * | 2012-05-09 | 2013-11-14 | 深圳凯虹移动通信有限公司 | Mobile communication terminal and circuit for reducing mutual interference between antenna and loudspeaker thereof |
| CN109343331A (en) * | 2018-11-16 | 2019-02-15 | 中国铁路总公司 | A kind of Railway Mobile Radio time dissemination system of Beidou+GPS dual signal synchronised clock |
| CN216649530U (en) * | 2021-12-03 | 2022-05-31 | 成都华立达信息技术有限公司 | Information acquisition remote communication terminal |
-
2023
- 2023-03-30 CN CN202310329563.4A patent/CN116455381A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4218748C1 (en) * | 1992-06-04 | 1993-10-21 | Licentia Gmbh | Transmission circuitry for rectangular signals over long transmission path - has pair of twisted conductors respectively coupled at input end to collector and emitter of output transistor of optical coupler receiving signal, and conductors coupled at output by respective ohmic resistors |
| WO2013166885A1 (en) * | 2012-05-09 | 2013-11-14 | 深圳凯虹移动通信有限公司 | Mobile communication terminal and circuit for reducing mutual interference between antenna and loudspeaker thereof |
| CN109343331A (en) * | 2018-11-16 | 2019-02-15 | 中国铁路总公司 | A kind of Railway Mobile Radio time dissemination system of Beidou+GPS dual signal synchronised clock |
| CN216649530U (en) * | 2021-12-03 | 2022-05-31 | 成都华立达信息技术有限公司 | Information acquisition remote communication terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3322889B2 (en) | Power transmission system | |
| US7236802B2 (en) | Coupling device for interfacing power amplifier and antenna in differential mode | |
| CN103166451A (en) | Switching power source circuit | |
| CN101320941A (en) | Switched-mode power supply quasi-resonant converter, switch control circuit and signal processing circuit | |
| CN105656049A (en) | Household power saver | |
| US20220216893A1 (en) | Interface circuit, string, and system applied to power line communication | |
| CN106451393B (en) | Optical module | |
| US9793942B1 (en) | Systems and methods for a switchless radio front end | |
| CN112787376B (en) | Charger (charger) | |
| CN116455381A (en) | Device for converting single-ended signal into differential signal | |
| CN105720932A (en) | Power amplifier adaptive to power supply voltage | |
| CN116131780B (en) | Power amplifying circuit and power amplifying method | |
| CN107919865A (en) | Transmitter and the system for including it | |
| CN111404288A (en) | Wireless charging equipment | |
| US10826373B2 (en) | Current pulse transformer for isolating electrical signals | |
| CN103118143B (en) | Multiplex circuit of serial interface and Ethernet interface | |
| US5109391A (en) | Unbalanced transmitter and receiver | |
| CN110768659B (en) | High-voltage driving circuit | |
| CN113595368B (en) | High-voltage frequency converter, IGBT isolation driver and common mode suppression circuit thereof | |
| CN111954340A (en) | DMX512 signal amplifier and LED control system | |
| CN110299846B (en) | Circuit control device and method and full-bridge LLC resonant circuit | |
| CN116094877B (en) | Differential signal transmission circuit and data transmission device | |
| CN116388803B (en) | Electronic device, demodulation method and wireless power transmission system | |
| CN215773083U (en) | Communication isolation circuit and communication isolator | |
| CN214337880U (en) | Differential demodulation circuit and receiving end circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |