CN214756078U - Bus surge high-voltage protector - Google Patents
Bus surge high-voltage protector Download PDFInfo
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- CN214756078U CN214756078U CN202120162855.XU CN202120162855U CN214756078U CN 214756078 U CN214756078 U CN 214756078U CN 202120162855 U CN202120162855 U CN 202120162855U CN 214756078 U CN214756078 U CN 214756078U
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Abstract
The utility model discloses a bus surge high voltage protector, because first isolation module and second are kept apart through fiber connection between the module, make first isolation module and second keep apart the electric isolation between the module, and inside first isolation module/second keeps apart each module circuit and the AC input end in the module with first isolation module/second isolation power module through first isolation power module/second isolation power module, the surge high voltage of avoiding the AC input end to get into keeps apart the influence of each module circuit in the module to first isolation module/second, and signal transmission on the RS485 circuit does not have the influence, the high voltage surge signal who produces on the RS485 signal line has also been blocked transmission channel simultaneously, can not get into the equipment of being protected.
Description
Technical Field
The utility model relates to a high-voltage protection technical field, concretely relates to bus surge high voltage protector.
Background
In modern society, the main objects of lightning destruction are electronic products and information system equipment. With the wide application of electronic products, the damage caused by lightning is more and more serious.
From the last 90 s, the lightning protection of electronic products and information systems has been performed by using SPD (surge protector) technology. However, the residual voltage of the SPD (surge protector) is high, transmission parameters do not meet system requirements, a magnetic field generated by the discharged current may damage sensitive equipment, the protection effect is not ideal, and the lightning protection of electronic products and information systems cannot be fundamentally solved. The protection of the surge high voltage on the bus signal in the existing industrial field is mainly completed by using a low-voltage SPD (surge protector), but the SPD (surge protector) has high residual voltage, large leakage current after aging, and the risk of fire burning, and can not completely protect important and critical equipment.
The RS485 bus is a traditional bus mode for equipment networking in an industrial field, and has the characteristics of simple interface, economy, practicability and the like. However, because the transmission voltage on the RS485 bus is low and the distance is long, the interference from strong electricity or electromagnetic field of the field device and the influence from lightning induction easily cause surge high voltage signals on the line, which damages the connected devices, and may burn out all devices on one loop under the action of strong interference.
The traditional protection method is that SPDs are connected in parallel on an RS485 circuit, when surge high voltage passes through, high voltage is discharged to the ground through devices such as a discharge tube and a piezoresistor, but the residual voltage of the SPDs is high and generally exceeds 100V, and far exceeds the bearing voltage of an RS485 device, so that an RS485 chip can be damaged; and the capacitance characteristic of the SPD can influence the communication transmission speed of the RS 485.
Disclosure of Invention
The utility model discloses the main technical problem who solves can be with the unrestrained high voltage isolation that surges that produces on the RS485 circuit outside by the protective apparatus.
In one embodiment, a bus surge high voltage protector is provided, comprising: the optical fiber isolation device comprises a first isolation module, a second isolation module and an optical fiber, wherein the first isolation module comprises a first RS485 transceiver module, a first conversion module, a first optical transceiver module and a first isolation power supply module;
the first RS485 transceiver module is used for receiving differential signals on the RS485 bus, converting the differential signals into TTL signals and outputting the TTL signals to the first optical transceiver module; or, the first RS485 transceiver module is configured to convert the TTL signal output by the first optical transceiver module into a differential signal, and send the differential signal to an RS485 bus;
the first conversion module is connected with the first RS485 receiving and transmitting module and is used for controlling the first RS485 receiving and transmitting module to convert between receiving differential signals and transmitting differential signals;
the first optical transceiver module is connected with the first conversion module and used for converting the TTL signal output by the first RS485 transceiver module into a first optical signal and outputting the first optical signal to an optical fiber; or, the optical fiber is used for converting the first optical signal on the optical fiber into a TTL signal and outputting the TTL signal to the first RS485 transceiver module;
the input end of the first isolation power supply module is connected with an alternating current power supply, and the output end of the first isolation power supply module is respectively connected with the first RS485 transceiver module, the first conversion module and the first optical transceiver module, and is used for isolating surge voltage on the alternating current power supply and supplying power to the first RS485 transceiver module, the first conversion module and the first optical transceiver module;
the optical fiber is connected with the first optical transceiver module and is used for transmitting a first optical signal;
the second isolation module comprises a second optical transceiver module, a second conversion module, a second RS485 transceiver module and a second isolation power supply module;
the second optical transceiver module is connected with the optical fiber and used for converting the first optical signal on the optical fiber into a TTL signal and outputting the TTL signal to the second RS485 transceiver module; or, the optical fiber is used for converting the TTL signal output by the second RS485 transceiver module into a first optical signal and outputting the first optical signal to the optical fiber;
the second RS485 transceiver module is used for receiving the differential signal output by the protected device, converting the differential signal into a TTL signal and outputting the TTL signal to the second optical transceiver module; or the second RS485 transceiver module is configured to convert a TTL signal output by the second optical transceiver module into a differential signal, and send the differential signal to the protected device;
the second conversion module is connected with the second RS485 transceiver module and used for controlling the second RS485 transceiver module to convert between receiving differential signals and transmitting differential signals;
and the input end of the second isolation power supply module is connected with the alternating current power supply, and the output end of the second isolation power supply module is respectively connected with the second RS485 transceiver module, the second conversion module and the second optical transceiver module, so that surge voltage on the alternating current power supply is isolated, and the second RS485 transceiver module, the second conversion module and the second optical transceiver module are powered.
In one embodiment, the first isolated power module comprises: the transient suppression circuit comprises a first isolation transformer, a first piezoresistor, a second piezoresistor, a third piezoresistor, a fourth piezoresistor, a first bridge rectifier, a first transient suppression diode, a second transient suppression diode, a first capacitor and a first voltage stabilizing diode;
the primary coil of the first isolation transformer is connected with an alternating current power supply, one end of a secondary coil of the first isolation transformer is connected with a first input end of a first bridge rectifier, the other end of the secondary coil is connected with a second input end of the first bridge rectifier, and an output end of the first bridge rectifier is connected with an output end of a first isolation power supply module through a first capacitor; the first voltage stabilizing diode is connected in parallel at two ends of the first capacitor, one end of the first transient suppression diode is connected with a first input end of the first bridge rectifier, the other end of the first transient suppression diode is connected with a second input end of the first bridge rectifier, one end of the second transient suppression diode is connected with the ground, and the other end of the second transient suppression diode is connected with an output end of the first isolation power supply module; one end of the first voltage dependent resistor and one end of the second voltage dependent resistor are connected with one end of the secondary coil of the first isolation transformer, the other end of the first voltage dependent resistor is connected with the output end of the first isolation power module, the other end of the second voltage dependent resistor is connected with the ground, one end of the third voltage dependent resistor and one end of the fourth voltage dependent resistor are connected with the other end of the secondary coil of the first isolation transformer, the other end of the third voltage dependent resistor is connected with the ground, and the other end of the fourth voltage dependent resistor is connected with the output end of the first isolation power module.
In one embodiment, the second isolated power module comprises: the second isolation transformer, the fifth piezoresistor, the sixth piezoresistor, the seventh piezoresistor, the eighth piezoresistor, the second bridge rectifier, the third transient suppression diode, the second capacitor and the second voltage stabilizing diode;
the primary coil of the second isolation transformer is connected with an alternating current power supply, one end of a secondary coil of the second isolation transformer is connected with a first input end of a second bridge rectifier, the other end of the secondary coil is connected with a second input end of the second bridge rectifier, and an output end of the second bridge rectifier is connected with an output end of a second isolation power supply module through a second capacitor; the second voltage stabilizing diode is connected in parallel at two ends of the second capacitor, one end of the third transient suppression diode is connected with the first input end of the second bridge rectifier, and the other end of the third transient suppression diode is connected with the second input end of the second bridge rectifier; one ends of a fifth piezoresistor and a sixth piezoresistor are connected with one end of a secondary coil of the second isolation transformer, the other end of the fifth piezoresistor is connected with the output end of the second isolation power module, the other end of the sixth piezoresistor is connected with the ground, one ends of a seventh piezoresistor and an eighth piezoresistor are connected with the other end of the secondary coil of the second isolation transformer, the other end of the seventh piezoresistor is connected with the ground, and the other end of the eighth piezoresistor is connected with the output end of the second isolation power module.
In one embodiment, the first RS485 transceiver module includes an RS485 transmitting terminal, an RS485 receiving terminal, and a transceiver switch;
the RS485 transmitting end is used for transmitting differential signals;
the RS485 receiving end is used for receiving differential signals;
the receiving and transmitting change-over switch is used for controlling the first RS485 receiving and transmitting module to change over between receiving differential signals and transmitting differential signals.
In one embodiment, the first conversion module comprises a first logic circuit, a second logic circuit, a first resistor, a third capacitor, a diode, and a third logic circuit;
the input end of the first logic circuit is connected with the receiving end of the first optical transceiver module, the output end of the first logic circuit is connected with the input end of the second logic circuit, the output end of the second logic circuit is connected with one end of the first resistor, the cathode of the diode and the RS485 sending end, the other end of the first resistor is connected with one end of the third capacitor, the input end of the third logic circuit and the anode of the diode, the other end of the third capacitor is connected with the ground, and the output end of the third logic circuit is connected with the transceiver change-over switch.
In one embodiment, the first conversion module further comprises a fourth logic circuit and a fifth logic circuit;
the input end of the fourth logic circuit is connected with the RS485 receiving end, the output end of the fourth logic circuit is connected with the input end of the fifth logic circuit, and the output end of the fifth logic circuit is connected with the transmitting end of the first optical transceiver module.
According to the bus surge high-voltage protector of the embodiment, the first isolation module is electrically isolated from the second isolation module through optical fiber connection between the first isolation module and the second isolation module, each module circuit in the first isolation module/the second isolation module is isolated from the alternating current input end through the first isolation power supply module/the second isolation power supply module inside the first isolation module/the second isolation module, the surge high voltage entering the alternating current input end is prevented from influencing each module circuit in the first isolation module/the second isolation module, signal transmission on the RS485 line is not influenced, meanwhile, a transmission channel is blocked by a high-voltage surge signal generated on the RS485 signal line, and the surge high-voltage surge signal cannot enter protected equipment.
Drawings
FIG. 1 is a schematic structural diagram of a bus surge high voltage protector according to an embodiment;
FIG. 2 is a schematic circuit diagram of a first isolated power supply module and a second isolated power supply module according to an embodiment;
fig. 3 is a schematic structural diagram of a first conversion module according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, fig. 1 is a schematic structural diagram of a bus surge high voltage protector according to an embodiment, where the bus surge high voltage protector includes a first isolation module 10, a second isolation module 20, and an optical fiber 30, and the first isolation module 10 includes a first RS485 transceiver module 101, a first conversion module 102, a first optical transceiver module 103, and a first isolation power module 104.
The first RS485 transceiver module 101 is used for receiving a differential signal on the RS485 bus, converting the differential signal into a TTL signal and outputting the TTL signal to the first optical transceiver module; or, the first RS485 transceiver module 101 is further configured to convert the TTL signal output by the first optical transceiver module into a differential signal, and send the differential signal to the RS485 bus.
In other words, the first RS485 transceiver module 101 in this embodiment can receive differential signals and can also transmit differential signals, and has two functions of transceiving.
The differential signal in this embodiment may be a signal output by the upper computer and used for interacting with the protected device, or may be a signal output by another device and used for interacting with the protected device.
The first RS485 transceiver module 101 in this embodiment includes an RS485 transmitting terminal, an RS485 receiving terminal, and a transceiver switch, where the RS485 transmitting terminal is used for transmitting differential signals, the RS485 receiving terminal is used for receiving differential signals, and the transceiver switch is used for controlling the first RS485 transceiver module to switch between receiving differential signals and transmitting differential signals.
The first conversion module 102 is connected to the first RS485 transceiver module 101, and is configured to control the first RS485 transceiver module to convert between receiving differential signals and transmitting differential signals. The first conversion module 102 in this embodiment is connected to the transceiving switch of the first RS485 transceiving module 101. In addition, the first conversion module 102 is also used to increase the transmission capability of the TTL signal.
The first optical transceiver module 103 is connected with the first RS485 transceiver module 101, and is configured to convert a TTL signal output by the first RS485 transceiver module 101 into a first optical signal and output the first optical signal to an optical fiber; or, the optical fiber is configured to convert the first optical signal on the optical fiber into a TTL signal, and output the TTL signal to the first RS485 transceiver module 101.
The first optical transceiver module 103 in this embodiment includes a transmitting end and a receiving end, where the transmitting end is used to transmit a TTL signal, and the receiving end is used to receive the TTL signal.
The input end of the first isolation power supply module 104 is connected with an alternating current power supply, and the output end of the first isolation power supply module is connected with the first RS485 transceiver module 101, the first conversion module 102 and the first optical transceiver module 103 respectively, so as to isolate surge voltage output by the alternating current power supply and convert 220V alternating current output by the alternating current power supply into 3.3V direct current to supply power to the first RS485 transceiver module 101, the first conversion module 102 and the first optical transceiver module 103.
The optical fiber 30 is connected to the first optical transceiver module 103, and the optical fiber 30 is used for transmitting a first optical signal. The optical fiber in the embodiment is made of a metal-free material, the length of the straight line is more than 1cm, the optical fiber can bear surge voltage impact of 10kv 1.2/50 mu s, and the RS485 bus can be electrically isolated from the protected equipment, so that the surge voltage on the RS485 bus cannot reach the protected equipment.
The second isolation module 20 includes a second optical transceiver module 201, a second conversion module 202, a second RS485 transceiver module 203, and a second isolation power module 204.
The second optical transceiver module 201 is connected to the optical fiber 30, and the second optical transceiver module 201 is configured to convert the first optical signal into a TTL signal and output the TTL signal.
The second RS485 transceiver module 203 is configured to receive a differential signal output by the protected device, convert the differential signal into a TTL signal, and output the TTL signal to the second optical transceiver module; or, the second RS485 transceiver module 203 is configured to convert the TTL signal output by the second optical transceiver module 201 into a differential signal, and send the differential signal to the protected device.
In this embodiment, the circuit structure and the working principle of the second RS485 transceiver module 203 are the same as those of the first RS485 transceiver module 101, and the second RS485 transceiver module 203 includes an RS485 transmitting terminal, an RS485 receiving terminal and a transceiver switch, where the RS485 transmitting terminal is used for transmitting a differential signal, the RS485 receiving terminal is used for receiving a differential signal, and the transceiver switch is used for controlling the second RS485 transceiver module to switch between receiving the differential signal and transmitting the differential signal.
The second conversion module 202 is connected to the second RS485 transceiver module, and is configured to control the second RS485 transceiver module to convert between receiving the differential signal and transmitting the differential signal. The second conversion module 202 in this embodiment is connected to the transceiving switch of the second RS485 transceiving module 203. In addition, the second conversion module 202 is also used to increase the transmission capability of the TTL signal.
The input end of the second isolation power supply module 204 is connected to the ac power supply, and the output end of the second isolation power supply module 204 is connected to the second RS485 transceiver module 203, the second conversion module 202, and the second optical transceiver module 201, respectively, for isolating the surge voltage output from the ac power supply, and converting the 220V ac output from the ac power supply into 3.3V dc to supply power to the second RS485 transceiver module 203, the second conversion module 202, and the second optical transceiver module 201.
Therefore, the bus surge high-voltage protector provided by the embodiment avoids the damage of surge high voltage on the RS485 bus to protected equipment on the basis of realizing signal bidirectional transmission.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of a first isolated power module and a second isolated power module according to an embodiment, wherein the first isolated power module includes: the transient suppression circuit comprises a first isolation transformer T1, a first voltage dependent resistor VR1, a second voltage dependent resistor VR2, a third voltage dependent resistor VR3, a fourth voltage dependent resistor VR4, a first bridge rectifier U1, a first transient suppression diode TVS1, a second transient suppression diode TVS2, a first capacitor C1 and a first voltage stabilizing diode Z1.
The primary coil of the first isolation transformer T1 is connected with an alternating current power supply, the CON1 interface is connected with the alternating current power supply, one end of the secondary coil of the first isolation transformer T1 is connected with the first input end of the first bridge rectifier U1, the other end of the secondary coil is connected with the second input end of the first bridge rectifier U1, and the output end of the first bridge rectifier U1 is connected with the output end VOUT1 of the first isolation power supply module through a first capacitor C1; the first zener diode Z1 is connected in parallel to two ends of the first capacitor C1, one end of the first transient suppressor TVS1 is connected to the first input end of the first bridge rectifier U1, the other end of the first transient suppressor TVS1 is connected to the second input end of the first bridge rectifier U1, one end of the second transient suppressor TVS2 is connected to ground, and the other end of the second transient suppressor TVS2 is connected to the output end of the first isolated power supply module; one end of the first voltage dependent resistor VR1 and one end of the second voltage dependent resistor VR2 are connected with one end of the secondary coil of the first isolation transformer T1, the other end of the first voltage dependent resistor VR1 is connected with the output end of the first isolation power module, the other end of the second voltage dependent resistor VR2 is connected with the ground, one end of the third voltage dependent resistor VR3 and one end of the fourth voltage dependent resistor VR4 are connected with the other end of the secondary coil of the first isolation transformer T1, the other end of the third voltage dependent resistor VR3 is connected with the ground, and the other end of the fourth voltage dependent resistor VR4 is connected with the output end of the first isolation power module.
In this embodiment, the first isolation transformer T1 can bear 10KV 1.2/50 μ s surge voltage, which can isolate the surge voltage input by the ac power supply, and the first isolation transformer T1 converts 220V ac power into lower voltage ac power, and then converts the lower voltage ac power into dc power through the first bridge rectifier, and finally outputs 3.3V dc power.
The second isolated power module includes: a second isolation transformer T2, a fifth varistor VR5, a sixth varistor VR6, a seventh varistor VR7, an eighth varistor VR8, a second bridge rectifier U2, a third transient suppression diode TVS3, a second capacitor C2, and a second zener diode Z2.
The primary coil of the second isolation transformer T2 is connected with an alternating current power supply, one end of the secondary coil of the second isolation transformer T2 is connected with the first input end of a second bridge rectifier U2, the other end of the secondary coil is connected with the second input end of the second bridge rectifier U2, and the output end of the second bridge rectifier U2 is connected with the output end VOT2 of the second isolation power supply module through a second capacitor C2; the second zener diode Z2 is connected in parallel to two ends of the second capacitor C2, one end of the third TVS3 is connected to the first input end of the second bridge rectifier U2, and the other end of the third TVS3 is connected to the second input end of the second bridge rectifier U2; one ends of a fifth piezoresistor VR5 and a sixth piezoresistor VR6 are connected with one end of a secondary coil of the second isolation transformer T2, the other end of the fifth piezoresistor VR5 is connected with the output end of the second isolation power module, the other end of the sixth piezoresistor VR6 is connected with the ground, one ends of a seventh piezoresistor VR7 and an eighth piezoresistor VR8 are connected with the other end of the secondary coil of the second isolation transformer T2, the other end of the seventh piezoresistor VR7 is connected with the ground, and the other end of the eighth piezoresistor VR8 is connected with the output end of the second isolation power module.
In this embodiment, the second isolation transformer T2 can bear 10KV 1.2/50 μ s surge voltage, which can isolate the surge voltage input by the ac power supply, and the second isolation transformer T2 converts 220V ac power into lower voltage ac power, and then converts the lower voltage ac power into dc power through the second bridge rectifier, and finally outputs 3.3V dc power.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a first conversion module according to an embodiment, where the first conversion module includes a first logic circuit U3, a second logic circuit U4, a first resistor R1, a third capacitor C3, a diode D1, a third logic circuit U5, a fourth logic circuit U6, and a fifth logic circuit U7.
The input end of the first logic circuit U3 is connected to the receiving end of the first optical transceiver module, the output end of the first logic circuit U3 is connected to the input end of the second logic circuit U4, the output end of the second logic circuit U4 is connected to one end of the first resistor R1, the cathode of the diode D1, and the transmitting end of the RS485, the other end of the first resistor R1 is connected to one end of the third capacitor C3, the input end of the third logic circuit U5, and the anode of the diode D1, the other end of the third capacitor C3 is connected to ground, and the output end of the third logic circuit U5 is connected to the transceiver switch. The input end of the fourth logic circuit U6 is connected with the RS485 receiving end, the output end of the fourth logic circuit U6 is connected with the input end of the fifth logic circuit U7, and the output end of the fifth logic circuit U7 is connected with the transmitting end of the first conversion module.
The first logic circuit, the second logic circuit, the third logic circuit, the fourth logic circuit and the fifth logic circuit in the embodiment can all adopt a logic circuit chip of an MC74HC04 model. In this embodiment, the first logic circuit, the second logic circuit, the third logic circuit, the fourth logic circuit, and the fifth logic circuit are all not gate logic circuits.
In the embodiment, the RS485 receiving and transmitting module is connected with the optical receiving and transmitting module by the logic circuit, and the MCU is not needed for control, so that the circuit is simplified, and the reliability of the circuit is improved.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (6)
1. A bus surge high voltage protector, comprising: the optical fiber isolation device comprises a first isolation module, a second isolation module and an optical fiber, wherein the first isolation module comprises a first RS485 transceiver module, a first conversion module, a first optical transceiver module and a first isolation power supply module;
the first RS485 transceiver module is used for receiving differential signals on the RS485 bus, converting the differential signals into TTL signals and outputting the TTL signals to the first optical transceiver module; or, the first RS485 transceiver module is configured to convert the TTL signal output by the first optical transceiver module into a differential signal, and send the differential signal to an RS485 bus;
the first conversion module is connected with the first RS485 receiving and transmitting module and is used for controlling the first RS485 receiving and transmitting module to convert between receiving differential signals and transmitting differential signals;
the first optical transceiver module is connected with the first conversion module and used for converting the TTL signal output by the first RS485 transceiver module into a first optical signal and outputting the first optical signal to an optical fiber; or, the optical fiber is used for converting the first optical signal on the optical fiber into a TTL signal and outputting the TTL signal to the first RS485 transceiver module;
the input end of the first isolation power supply module is connected with an alternating current power supply, and the output end of the first isolation power supply module is respectively connected with the first RS485 transceiver module, the first conversion module and the first optical transceiver module, and is used for isolating surge voltage on the alternating current power supply and supplying power to the first RS485 transceiver module, the first conversion module and the first optical transceiver module;
the optical fiber is connected with the first optical transceiver module and is used for transmitting a first optical signal;
the second isolation module comprises a second optical transceiver module, a second conversion module, a second RS485 transceiver module and a second isolation power supply module;
the second optical transceiver module is connected with the optical fiber and used for converting the first optical signal on the optical fiber into a TTL signal and outputting the TTL signal to the second RS485 transceiver module; or, the optical fiber is used for converting the TTL signal output by the second RS485 transceiver module into a first optical signal and outputting the first optical signal to the optical fiber;
the second RS485 transceiver module is used for receiving the differential signal output by the protected device, converting the differential signal into a TTL signal and outputting the TTL signal to the second optical transceiver module; or the second RS485 transceiver module is configured to convert a TTL signal output by the second optical transceiver module into a differential signal, and send the differential signal to the protected device;
the second conversion module is connected with the second RS485 transceiver module and used for controlling the second RS485 transceiver module to convert between receiving differential signals and transmitting differential signals;
and the input end of the second isolation power supply module is connected with the alternating current power supply, and the output end of the second isolation power supply module is respectively connected with the second RS485 transceiver module, the second conversion module and the second optical transceiver module, so that surge voltage on the alternating current power supply is isolated, and the second RS485 transceiver module, the second conversion module and the second optical transceiver module are powered.
2. The bus surge high voltage protector of claim 1, wherein said first isolated power module comprises: the transient suppression circuit comprises a first isolation transformer (T1), a first voltage dependent resistor (VR1), a second voltage dependent resistor (VR2), a third voltage dependent resistor (VR3), a fourth voltage dependent resistor (VR4), a first bridge rectifier (U1), a first transient suppression diode (TVS1), a second transient suppression diode (TVS2), a first capacitor (C1) and a first voltage-stabilizing diode (Z1);
the primary coil of the first isolation transformer (T1) is connected with an alternating current power supply, one end of the secondary coil of the first isolation transformer (T1) is connected with the first input end of a first bridge rectifier (U1), the other end of the secondary coil is connected with the second input end of the first bridge rectifier (U1), and the output end of the first bridge rectifier (U1) is connected with the output end of the first isolation power supply module through a first capacitor (C1); the first voltage stabilizing diode (Z1) is connected in parallel at two ends of a first capacitor (C1), one end of the first transient suppression diode (TVS1) is connected with a first input end of a first bridge rectifier (U1), the other end of the first transient suppression diode (TVS1) is connected with a second input end of the first bridge rectifier (U1), one end of the second transient suppression diode (TVS2) is connected with the ground, and the other end of the second transient suppression diode (TVS2) is connected with an output end of the first isolation power supply module; one end of a first voltage dependent resistor (VR1) and one end of a second voltage dependent resistor (VR2) are connected with one end of a secondary coil of a first isolation transformer (T1), the other end of the first voltage dependent resistor (VR1) is connected with the output end of a first isolation power supply module, the other end of the second voltage dependent resistor (VR2) is connected with the ground, one end of a third voltage dependent resistor (VR3) and one end of a fourth voltage dependent resistor (VR4) are connected with the other end of the secondary coil of the first isolation transformer (T1), the other end of the third voltage dependent resistor (VR3) is connected with the ground, and the other end of the fourth voltage dependent resistor (VR4) is connected with the output end of the first isolation power supply module.
3. The bus surge high voltage protector of claim 1, wherein said second isolated power module comprises: a second isolation transformer (T2), a fifth piezoresistor (VR5), a sixth piezoresistor (VR6), a seventh piezoresistor (VR7), an eighth piezoresistor (VR8), a second bridge rectifier (U2), a third transient suppression diode (TVS3), a second capacitor (C2) and a second zener diode (Z2);
a primary coil of the second isolation transformer (T2) is connected with an alternating current power supply, one end of a secondary coil of the second isolation transformer (T2) is connected with a first input end of a second bridge rectifier (U2), the other end of the secondary coil is connected with a second input end of the second bridge rectifier (U2), and an output end of the second bridge rectifier (U2) is connected with an output end of the second isolation power supply module through a second capacitor (C2); the second voltage stabilizing diode (Z2) is connected in parallel at two ends of a second capacitor (C2), one end of the third transient suppression diode (TVS3) is connected with the first input end of the second bridge rectifier (U2), and the other end of the third transient suppression diode (TVS3) is connected with the second input end of the second bridge rectifier (U2); one end of a fifth piezoresistor (VR5) and one end of a sixth piezoresistor (VR6) are connected with one end of a secondary coil of a second isolation transformer (T2), the other end of the fifth piezoresistor (VR5) is connected with the output end of a second isolation power supply module, the other end of the sixth piezoresistor (VR6) is connected with the ground, one end of a seventh piezoresistor (VR7) and one end of an eighth piezoresistor (VR8) are connected with the other end of the secondary coil of the second isolation transformer (T2), the other end of the seventh piezoresistor (VR7) is connected with the ground, and the other end of the eighth piezoresistor (VR8) is connected with the output end of the second isolation power supply module.
4. The bus surge high voltage protector of claim 1, wherein said first RS485 transceiver module comprises an RS485 transmitter, an RS485 receiver and a transceiver switch;
the RS485 transmitting end is used for transmitting differential signals;
the RS485 receiving end is used for receiving differential signals;
the receiving and transmitting change-over switch is used for controlling the first RS485 receiving and transmitting module to change over between receiving differential signals and transmitting differential signals.
5. The bus surge high voltage protector of claim 4, wherein the first conversion module comprises a first logic circuit (U3), a second logic circuit (U4), a first resistor (R1), a third capacitor (C3), a diode (D1), and a third logic circuit (U5);
the input end of the first logic circuit (U3) is connected with the receiving end of the first optical transceiver module, the output end of the first logic circuit (U3) is connected with the input end of the second logic circuit (U4), the output end of the second logic circuit (U4) is connected with one end of a first resistor (R1), the cathode of a diode (D1) and the RS485 sending end, the other end of the first resistor (R1) is connected with one end of a third capacitor (C3), the input end of the third logic circuit (U5) and the anode of a diode (D1), the other end of the third capacitor (C3) is connected with the ground, and the output end of the third logic circuit (U5) is connected with the transceiver change-over switch.
6. The bus surge high voltage protector of claim 5, wherein said first switching module further comprises a fourth logic circuit (U6) and a fifth logic circuit (U7);
the input end of the fourth logic circuit (U6) is connected with the RS485 receiving end, the output end of the fourth logic circuit (U6) is connected with the input end of the fifth logic circuit (U7), and the output end of the fifth logic circuit (U7) is connected with the transmitting end of the first optical transceiver module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120162855.XU CN214756078U (en) | 2021-01-19 | 2021-01-19 | Bus surge high-voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120162855.XU CN214756078U (en) | 2021-01-19 | 2021-01-19 | Bus surge high-voltage protector |
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| Publication Number | Publication Date |
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| CN214756078U true CN214756078U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120162855.XU Active CN214756078U (en) | 2021-01-19 | 2021-01-19 | Bus surge high-voltage protector |
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| CN (1) | CN214756078U (en) |
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- 2021-01-19 CN CN202120162855.XU patent/CN214756078U/en active Active
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