An active and passive automatic switching isolator

Abstract

The present invention discloses an active-passive automatic switching isolator, comprising: a power conversion circuit, an input acquisition circuit, and an output circuit; the input acquisition circuit comprising: an input switching module, an acquisition conversion module, and an oscillation module; the input switching module being connected to the acquisition conversion module or the oscillation module; the acquisition conversion module being connected to the oscillation module and configured to convert and amplify the current signal of an active signal or a passive signal and input the signal to the oscillation module; the oscillation module being connected to the output circuit via a third mutual inductor; and the power conversion circuit being configured to provide power to the input switching module, the acquisition conversion module, and the oscillation module, as well as to distribute power to the input passive signal via the input switching module. The isolator of the present invention can isolate two signals with one device. When switching between active and passive signals, there is no need to replace the isolator, thereby expanding the use scenarios, improving the convenience of use, and meeting the user's needs for different products.

Description

Technical Field

[0001] The present invention relates to the technical field of isolation circuits, and in particular to an active-passive automatic switching isolator. Background Art

[0002] In industrial and electronic systems, signal transmission between sensors and other electronic devices is often subject to various interferences, such as electromagnetic interference and ground loop interference. Isolation circuits effectively avoid these interferences by providing electrical isolation between two parts of the circuit, ensuring stable signal transmission and normal operation of the equipment.

[0003] In the prior art, the isolation circuits for active transmitters and passive transmitters are two separate modules. Using different products requires installing and using corresponding isolation modules separately, which is very inconvenient when replacing transmitters. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides an active-passive automatic switching isolator. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] A first aspect of an embodiment of the present invention provides an active-passive automatic switching isolator, comprising: a power conversion circuit, an input acquisition circuit, and an output circuit;

[0006] The input acquisition circuit includes: an input switching module, an acquisition conversion module and an oscillation module;

[0007] The input switching module is connected to the acquisition and conversion module or the oscillation module, and is used to switch the connection according to the input active signal or the passive signal to send the input signal to the acquisition and conversion module or the oscillation module;

[0008] The acquisition and conversion module is connected to the oscillation module and is used to convert and amplify the current signal of the active signal or the passive signal and input it into the oscillation module;

[0009] The oscillation module is connected to the output circuit via a third mutual inductor;

[0010] The power conversion circuit is used to provide power to the input switching module, the acquisition conversion module and the oscillation module, and to distribute power to the input passive signal through the input switching module.

[0011] In one embodiment of the present invention, the input switching module includes: a first relay, a second relay, a diode D7, a capacitor C56, an inductor L3, a resistor R19, an N-type transistor Q2, an N-type transistor Q1, a resistor R18, a bidirectional transient voltage suppression diode TVS5, an inductor L8, an inductor L12, a capacitor C53, an electrolytic capacitor E3, a capacitor C54 and a capacitor C55;

[0012] The first pin of the first relay is connected to one end of the capacitor C56 and the third power supply terminal, the eighth pin is connected to the other end of the capacitor C56 and the second ground terminal GND2, and the capacitor C56 is further connected to the diode D7 in parallel;

[0013] The third pin of the first relay is connected to the input terminal J12A, the fourth pin of the first relay is connected to one end of the inductor L3, the other end of the inductor L3, one end of the resistor R19 is connected to the emitter of the N-type transistor Q2, the other end of the resistor R9 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q2 is connected to the base of the N-type transistor Q1, the emitter of the N-type transistor Q1 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q1 is connected to the second power supply terminal and the other end of the resistor R18, and one end of the resistor R18 is connected to the base of the N-type transistor Q1;

[0014] The second pin of the first relay is connected to one end of the bidirectional transient suppression diode TVS5, the other end of the bidirectional transient suppression diode TVS5 is connected to the seventh pin of the second relay, and the sixth pin of the second relay is connected to the input terminal J12B;

[0015] One end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L8, the other end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L12, the other end of the inductor L8 is connected to one end of the capacitor C53, and the other end of the capacitor C53 is connected to the other end of the inductor L12;

[0016] The capacitor C53 is also connected in parallel with the electrolytic capacitor E3 and the capacitor C54. The capacitor C54 is connected to the oscillation module, wherein the positive electrode of the electrolytic capacitor E3 is connected to one end of the capacitor C53.

[0017] In one embodiment of the present invention, the acquisition and conversion module includes: a bidirectional transient suppression diode TVS2, a bidirectional transient suppression diode TVS3, an inductor L9, an inductor L11, a capacitor C42, a self-recovery fuse F2, a capacitor C40, a common-mode inductor L10, a capacitor C15, a resistor R62, a capacitor C16, a first amplifier, a variable resistor RT1, a variable resistor RT2, a resistor R66, a capacitor C41, a resistor R67, a resistor R28, a capacitor C22, a resistor R29, a resistor R20, a resistor R32, a resistor R33, a resistor R30, a resistor R31, a resistor R34, a second amplifier, a resistor R35, a capacitor C23, a resistor R36, a resistor R37, an N-type field effect transistor MQ6, and an N-type field effect transistor MQ7;

[0018] One end of the bidirectional transient suppression diode TVS2 is connected to the fourth pin of the first relay, and the other end of the bidirectional transient suppression diode TVS2 is connected to the fifth pin of the second relay; the other end of the bidirectional transient suppression diode TVS2 is also connected to the input terminal J11A, one end of the inductor L9, and one end of the bidirectional transient suppression diode TVS3; the other end of the bidirectional transient suppression diode TVS3 is connected to the input terminal J11B and one end of the inductor L11; the bidirectional transient suppression diode TVS3 is also connected in parallel with the capacitor C42;

[0019] The other end of the inductor L9 is connected to one end of the resettable fuse F2, the other end of the resettable fuse F2 is connected to one end of the capacitor C40, the other end of the capacitor C40 is connected to the other end of the inductor L11, one end of the capacitor C40 is also connected to the second end of the common-mode inductor L10, and the other end of the capacitor C40 is also connected to the first end of the common-mode inductor L10;

[0020] The third and fourth ends of the common-mode inductor L10 are connected in parallel to the capacitor C15. The capacitor C15 is connected in parallel to the resistor R62. One end of the resistor R62 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to one end of the capacitor C16 and the third pin of the first amplifier. The other end of the capacitor C16 is connected to the resistor R62 and the second ground terminal GND2.

[0021] A first pin of the first amplifier is connected to one end of the resistor RT1, an eighth pin of the first amplifier is connected to one end of the resistor RT2, and a seventh pin of the first amplifier is connected to the other end of the resistor RT1, the other end of the resistor RT2, and the positive electrode of the third power supply. A second pin of the first amplifier is connected to one end of the resistor R66 and one end of the resistor R67. A sixth pin of the first amplifier is connected to one end of the resistor R28 and the other end of the resistor R66. The other end of the resistor R67 is grounded. A fourth pin of the first amplifier is connected to the negative electrode of the third power supply. A capacitor C41 is connected in parallel with the resistor R66.

[0022] One end of the capacitor C22 is connected to the other end of the resistor R28, and the other end of the capacitor C22 is connected to the second ground terminal GND2; the resistors R29, R20, R32, and R33 are connected in series and in parallel with the capacitor C22; the resistor R30 is connected in parallel with the resistor R29, and the resistor R31 is connected in parallel with the resistor R20 and in series with the resistor R30;

[0023] The third pin of the second amplifier is connected to the circuit connecting resistor R30 and resistor R31 and the circuit connecting resistor R29 and resistor R20 in sequence; the second pin of the second amplifier is connected to one end of resistor R34 and one end of capacitor C23, and the other end of resistor R34 is connected to the second ground terminal GND2; the seventh pin of the second amplifier is connected to the positive electrode of the third power supply terminal, and the fourth pin of the second amplifier is connected to the negative electrode of the third power supply terminal; the sixth pin of the second amplifier is connected to one end of resistor R35, the other end of resistor R35 is connected to the other end of capacitor C23 and the gate of N-type field effect transistor MQ6, the source of N-type field effect transistor MQ6 is connected to one end of resistor R36, and the other end of resistor R36 is connected to the circuit connecting capacitor C23 and resistor R34;

[0024] The gate of the N-type field effect transistor MQ7 is connected to the other end of the capacitor R35, the source of the N-type field effect transistor MQ7 is connected to one end of the resistor R37, and the other end of the resistor R37 is connected to the circuit connecting the capacitor C23 and the resistor R34; the drain of the N-type field effect transistor MQ6 and the drain of the N-type field effect transistor MQ7 are connected to the oscillation module.

[0025] In one embodiment of the present invention, the oscillation module includes: a diode D8, a capacitor C55, a resistor R38, a resistor R39, a capacitor C24, a capacitor C25, a diode D11B, a diode D11A, a capacitor C26, an inductor L5A, an N-type transistor Q3A, a P-type transistor Q3B, an inductor L5B, a capacitor C27, and a capacitor C28;

[0026] The anode of diode D8 is connected to the first power supply terminal, the cathode of diode D8 is connected to one end of resistor R38 and one end of capacitor C55, capacitor C55 is connected in parallel with capacitor C54, the other end of resistor R38 is connected to one end of capacitor C24, the other end of capacitor C24 is connected to one end of capacitor C25, the other end of capacitor C25 is connected to the other end of resistor R39, and the other end of resistor R39 is connected to the other end of capacitor C55;

[0027] The cathode of diode D11B is connected to one end of capacitor C24, the anode of diode D11B is connected to the other end of capacitor C24, the cathode of diode D11A is connected to one end of capacitor C25, the anode of diode D11A is connected to the other end of capacitor C25, the anode of diode D11B is connected to the cathode of diode D11A, the anode of diode D11B and the cathode of diode D11A are connected to one end of capacitor C26 and one end of inductor L5A; the other end of capacitor C26 and the other end of inductor L5A are connected. are all connected to the emitter of the N-type transistor Q3A, the emitter of the N-type transistor Q3A is further connected to one end of the inductor L5B and the emitter of the P-type transistor Q3B, the base of the N-type transistor Q3A is connected to the cathode of the diode D11B, the collector of the N-type transistor Q3A is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the capacitor C28, the other end of the capacitor C28 is connected to the collector of the P-type transistor Q3B, and the base of the P-type transistor Q3B is connected to the anode of the diode D11A;

[0028] The other end of the inductor L5B and one end of the capacitor C28 are connected to the first end and the fifth end of the third mutual inductor, respectively.

[0029] In one embodiment of the present invention, the output circuit includes: a diode D12A, a diode D12B, a capacitor C30, a capacitor C31, a capacitor C29, a capacitor C32, a common-mode inductor L7, a capacitor C52, a self-recovery fuse F3, and a bidirectional transient suppression diode TVS4;

[0030] The sixth terminal of the third mutual inductor is connected to the anode of the diode D12A and the cathode of the diode D12B, and the tenth terminal of the third mutual inductor is connected to the first ground terminal GNO1;

[0031] Diode D12A and diode D12B are connected in series, two ends of capacitor C30 are connected to the positive electrode of diode D12A and the negative electrode of diode D12B respectively, capacitor C31 is connected in series with capacitor C30, and the other end of capacitor C31 is connected to the first ground terminal GNO1; capacitor C32 is connected in parallel with capacitor C30, capacitor C29 is connected in series with capacitor C32, and one end of capacitor C29 is connected to the first ground terminal GNO1, the first and second ends of common-mode inductor L7 are connected to two ends of capacitor C32, the third and fourth ends of common-mode inductor L7 are connected to two ends of capacitor C52, one end of capacitor C52 is connected to one end of self-recovery fuse F3, the other end of self-recovery fuse F3 is connected to one end of bidirectional transient suppressor diode TVS4, the other end of bidirectional transient suppressor diode TVS4 is connected to the other end of capacitor C52, and the two ends of bidirectional transient suppressor diode TVS4 are connected to the two output ends.

[0032] In one embodiment of the present invention, the power conversion circuit includes: a voltage conversion circuit, a transformer coil drive circuit, a transformer, a first AC voltage rectification and filtering circuit, a second AC voltage rectification and filtering circuit, and a third AC voltage rectification and filtering circuit;

[0033] The voltage conversion circuit is connected to the transformer coil drive circuit, the transformer coil drive circuit is connected to one end of the transformer, and the other end of the transformer is connected to the first AC voltage rectification and filtering circuit, the second AC voltage rectification and filtering circuit, and the third AC voltage rectification and filtering circuit;

[0034] The first AC voltage rectification and filtering circuit is used to provide power to the oscillation module;

[0035] The second AC voltage rectifier and filter circuit distributes power to the input passive signal through the input switching module;

[0036] The third AC voltage rectification and filtering circuit is used to provide power to the input switching module and the acquisition and conversion module.

[0037] In one embodiment of the present invention, the voltage conversion circuit includes: a bus power supply terminal, a bidirectional transient suppression diode TVS1, a capacitor C1, a common mode inductor L6, a capacitor C7, an inductor L1, an inductor L4, a self-recovery fuse F1, a diode D1, a capacitor C6, an electrolytic capacitor E1, a capacitor C2, a resistor R1, a resistor R2, a capacitor C3, a power chip, a capacitor C4, a Schottky diode D2, an inductor L2, a resistor R3, a resistor R4, a resistor R5, a capacitor C38, a capacitor C37, an electrolytic capacitor E2, a voltage regulator Z1, a resistor R6, a capacitor C5 and an oscillation chip.

[0038] The fourth and fifth pins of the bus power supply terminal are connected to the positive and negative electrodes of the power supply, respectively. Two ends of the bidirectional transient suppressor diode TVS1 are connected to the fourth and fifth pins of the bus power supply terminal. The capacitor C1 is connected in parallel with the bidirectional transient suppressor diode TVS1. Two ends of the capacitor C1 are connected to the first and second ends of the common-mode inductor L6. The third and fourth ends of the common-mode inductor L6 are connected to two ends of the capacitor C7. One end of the capacitor C7 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the resettable fuse F1. The other end of the resettable fuse F1 is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to the other end of the inductor L4. One end of the inductor L4 is connected to the other end of the capacitor C7.

[0039] Electrolytic capacitor E1 is connected in parallel with capacitor C6, capacitor C2 is connected in parallel with electrolytic capacitor E1, one end of capacitor C2 is also connected to one end of resistor R1, the other end of resistor R2 is connected to one end of resistor R2, the other end of resistor R2 is connected to the other end of capacitor C2, both ends of resistor R1 are also connected to the VIN terminal and EN terminal of the power chip respectively, capacitor C3 is connected in parallel with resistor R2, the other end of capacitor C3 is connected to the GND terminal of the power chip, and the GND terminal of the power chip is grounded;

[0040] The BST terminal and SW terminal of the power chip are respectively connected to the two ends of capacitor C4, the end of capacitor C4 connected to the SW terminal is connected to one end of inductor L2 and the cathode of Schottky diode D2, the anode of Schottky diode D2 is grounded and connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R3 and the FB terminal of the power chip, the other end of resistor R3 is connected to the other end of inductor L2, the other end of inductor L2 is connected to one end of capacitor C38, and the other end of capacitor C38 is connected to one end of resistor R5;

[0041] Capacitor C37 is connected in parallel with capacitor C38, electrolytic capacitor E2 is connected in parallel with capacitor C37, the positive electrode of electrolytic capacitor E2 is connected to the negative electrode of voltage regulator Z1, the positive electrode of voltage regulator Z1 is connected to the fourth pin, fifth pin, fourteenth pin and sixth pin of the oscillation chip, the tenth pin and eleventh pin of the oscillation chip are connected to the transformer coil drive circuit, the first pin and third pin of the oscillation chip are connected to the two ends of capacitor C5, the second pin and third pin of the oscillation chip are connected to the two ends of resistor R6, and the eighth pin, ninth pin, seventh pin and twelfth pin of the oscillation chip are all connected to the negative electrode of electrolytic capacitor E2.

[0042] In one embodiment of the present invention, the transformer coil drive circuit includes: a diode D16, a resistor R7, a resistor R9, a diode D17, a resistor R8, a resistor R10, an N-type field effect transistor MQ1, and an N-type field effect transistor MQ2;

[0043] The cathode of diode D16 and one end of resistor R7 are both connected to the tenth pin of the oscillation chip, the anode of diode D16 is connected to the other end of resistor R7, the anode of diode D16 is also connected to one end of resistor R8, the other end of resistor R8 is connected to the twelfth pin of the oscillation chip, the eleventh pin of the oscillation chip is connected to one end of resistor R9 and the cathode of diode D17, the other end of resistor R9 is connected to the anode of diode D17, the anode of diode D17 is also connected to resistor R10 and the gate of N-type field effect transistor MQ2, the other end of resistor R10 is connected to the other end of resistor R8, the drain of N-type field effect transistor MQ2 is connected to the third terminal at one end of the transformer, and the source of N-type field effect transistor MQ2 is connected to the other end of resistor R10 and the source of N-type field effect transistor MQ1;

[0044] The gate of the N-type field effect transistor MQ1 is connected to one end of the resistor R8, the drain of the N-type field effect transistor MQ1 is connected to the first end of one end of the transformer, and the second end of one end of the transformer is connected to the negative electrode of the voltage regulator tube Z1.

[0045] In one embodiment of the present invention, the first AC voltage rectification and filtering circuit includes: a diode D5A, a diode D5B, a diode D6A, a diode D6B, a capacitor C14, a capacitor C17, a capacitor C18, and a resistor R17;

[0046] The ninth terminal on the other end of the transformer is connected to the cathode of diode D6A, and the tenth terminal on the other end of the transformer is connected to the cathode of diode D5A;

[0047] The anode of diode D5A is connected to the anode of diode D6A, the cathode of diode D5A is connected to the anode of diode D5B, the cathode of diode D5B is connected to the cathode of diode D6B, the anode of diode D6B is connected to the cathode of diode D6A, the anode of diode D6A is connected to one end of capacitor C14, the cathode of diode D6B is connected to the other end of capacitor C14, capacitor C17 is connected in parallel with capacitor C14, capacitor C18 is connected in parallel with capacitor C17, one end of capacitor C18 connected to the anode of diode D6A is connected to the second ground GND2, one end of resistor R17 is connected to one end of capacitor C18 and to the first power supply end, and the other end of resistor R17 is connected to one end of capacitor C18 connected to the second ground GND2.

[0048] In one embodiment of the present invention, the second AC voltage rectification and filtering circuit includes: a diode D4A, a diode D4B, a capacitor C12, a capacitor C13, a capacitor C19, and a resistor R16;

[0049] The eighth terminal at the other end of the transformer is connected to the anode of diode D4A, the cathode of diode D4A is connected to one end of capacitor C12, and the other end of capacitor C12 is connected to the seventh terminal at the other end of the transformer; the anode and cathode of diode D4A are connected to the anode and cathode of diode D4B, respectively; capacitor C13 is connected in parallel with capacitor C12, capacitor C19 is connected in parallel with capacitor C13, the other end of resistor R16 connected in parallel with capacitor C19 is connected to capacitor C13, one end of resistor R16 connected to capacitor C12 is connected to the second ground terminal GND2, and the other end of resistor R16 is connected to the second power supply terminal;

[0050] The third AC voltage rectification and filtering circuit includes: a diode D3A, a diode D3B, a capacitor C10, a capacitor C11, a capacitor C20, a capacitor C33, a capacitor C21, a capacitor C34, a capacitor C35, a capacitor C36, a resistor R15 and a light-emitting diode;

[0051] A fifth terminal at the other end of the transformer is connected to the second ground terminal GND2, a sixth terminal at the other end of the transformer is connected to the anode of diode D3B, the cathode of diode D3B is connected to one end of capacitor C10, the other end of capacitor C10 is connected to one end of capacitor C11 and the second ground terminal GND2, the other end of capacitor C11 is connected to the anode of diode D3A, and the cathode of diode D3A is connected to the anode of diode D3B;

[0052] Capacitor C20 is connected in parallel with capacitor C10, capacitor C33 is connected in series with capacitor C20 and in parallel with capacitor C11, capacitor C21 is connected in parallel with capacitor C20, capacitor C34 is connected in series with capacitor C21 and in parallel with capacitor C33, capacitor C35 is connected in parallel with capacitor C21, capacitor C36 is connected in series with capacitor C35 and in parallel with capacitor C34, capacitor C35 is connected in series with resistor R15 and a light-emitting diode, and the negative electrode of the light-emitting diode is connected to the series circuit between capacitor C35 and capacitor C36; the series circuit directly connected between capacitor C35 and resistor R15 is connected to the positive electrode of the third power supply terminal, and the series circuit directly connected between capacitor C35 and resistor R15 is also connected to the positive electrode of the third power supply terminal, and one end of capacitor C36 connected to the positive electrode of diode D3A is connected to the negative electrode of the third power supply terminal.

[0053] Beneficial effects of the present invention:

[0054] The isolator of the present invention is adaptable and compatible with active signals and passive signals. One device can be compatible with the isolation of two signals. When changing the active or passive signal, there is no need to replace the isolator, which expands the usage scenarios, improves the convenience of use, and meets the user's needs for different products.

[0055] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0056] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0058] Figure 1 A schematic block diagram of a circuit principle of an active-passive automatic switching isolator provided in an embodiment of the present invention;

[0059] Figure 2 A circuit diagram of an input switching module and an acquisition conversion module provided in an embodiment of the present invention;

[0060] Figure 3 A circuit diagram of an oscillation module and an output circuit provided in an embodiment of the present invention;

[0061] Figure 4 A circuit diagram of a power conversion circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0063] like Figure 1 As shown, an embodiment of the present invention provides an active-passive automatic switching isolator, which is characterized by comprising: a power conversion circuit, an input acquisition circuit and an output circuit 31.

[0064] The input acquisition circuit includes: an input switching module 21 , an acquisition conversion module 22 and an oscillation module 24 .

[0065] The input switching module 21 is connected to the acquisition and conversion module 22 or the oscillation module 24 . The input switching module 21 is used to switch the connection according to the input active signal or passive signal to send the input signal to the acquisition and conversion module 22 or the oscillation module 24 .

[0066] The acquisition and conversion module 22 is connected to the oscillation module 24 . The acquisition and conversion module 22 is used to convert and amplify the current signal of the active signal or the passive signal and input the amplified current signal to the oscillation module 24 .

[0067] The oscillation module 24 is connected to the output circuit 31 via a third mutual inductor.

[0068] The power conversion circuit is used to provide power to the input switching module 21 , the acquisition conversion module 22 and the oscillation module 24 , and to distribute power to the input passive signal through the input switching module 21 .

[0069] In this embodiment, a passive signal or an active signal is input into the isolator of this embodiment, undergoes signal isolation, and is then output to a data receiving terminal.

[0070] The power conversion circuit includes: a voltage conversion circuit 11, a transformer coil drive circuit 12, a transformer 13, a first AC voltage rectification and filtering circuit 14, a second AC voltage rectification and filtering circuit 15 and a third AC voltage rectification and filtering circuit 16.

[0071] The voltage conversion circuit 11 is connected to the transformer coil drive circuit 12, the transformer coil drive circuit 12 is connected to one end of the transformer 13, and the other end of the transformer 13 is connected to the first AC voltage rectification and filtering circuit 14, the second AC voltage rectification and filtering circuit 15 and the third AC voltage rectification and filtering circuit 16;

[0072] The first AC voltage rectification and filtering circuit 14 is used to provide power to the oscillation module 24;

[0073] The second AC voltage rectifier and filter circuit 15 distributes power to the input passive signal through the input switching module 21;

[0074] The third AC voltage rectification and filtering circuit 16 is used to provide power to the input switching module 21 and the acquisition and conversion module 22 .

[0075] In this embodiment, when the isolator is a passive device, an active signal is input to the corresponding input terminal of the isolator. In this case, no independent power supply is required. The relay of input switching module 21 is inoperative, the normally open contact is open, and the normally closed contact is closed. The current signal flows from the relay terminal, passes through the normally closed contact of the relay, and enters oscillation module 24. After passing through oscillation module 24, it enters output circuit 31 for output.

[0076] When the isolator is an active product, a passive signal can be input to the corresponding input end of the isolator. In this case, an independent 24VDC power supply is required. The 24VDC is stepped down by the power conversion circuit and isolated by the transformer 13 to convert it into 5VDC to power the relay of the input switching module 21. After the relay is energized, the normally open contact closes and the normally closed contact opens, and the input end automatically switches to a two-wire input port. At this time, the input signal enters the acquisition and conversion module 22, then passes through the oscillation module 24, and is finally output from the output circuit 31. Here, the first AC voltage rectifier and filter circuit 14 supplies power to the oscillation module 24, the second AC voltage rectifier and filter circuit 15 distributes power to the input passive signal through the input switching module 21, and the third AC voltage rectifier and filter circuit 16 supplies power to the input switching module 21 and the acquisition and conversion module 22.

[0077] When the isolator is an active product, the corresponding input terminal of the isolator can input an active signal and requires an independent 24VDC power supply. The input signal is directly input to the acquisition and conversion module 22, then passes through the oscillation module 24, and finally output from the output circuit 31. Here, the first AC voltage rectification and filtering circuit 14 supplies power to the oscillation module 24, and the third AC voltage rectification and filtering circuit 16 supplies power to the acquisition and conversion module 22.

[0078] The isolator of this embodiment is adaptable and compatible with both active and passive input signals. One device can be compatible with the isolation of both signals. When changing the active or passive signal, there is no need to replace the isolator, which expands the usage scenarios, improves the convenience of use, and meets the user's needs for different products.

[0079] Furthermore, if Figure 2 As shown, the input switching module 21 includes: a first relay, a second relay, a diode D7, a capacitor C56, an inductor L3, a resistor R19, an N-type transistor Q2, an N-type transistor Q1, a resistor R18, a bidirectional transient voltage suppression diode TVS5, an inductor L8, an inductor L12, a capacitor C53, an electrolytic capacitor E3, a capacitor C54 and a capacitor C55;

[0080] The first pin of the first relay is connected to one end of the capacitor C56 and the third power supply terminal, the eighth pin is connected to the other end of the capacitor C56 and the second ground terminal GND2, and the capacitor C56 is further connected to the diode D7 in parallel;

[0081] The third pin of the first relay is connected to the input terminal J12A, the fourth pin of the first relay is connected to one end of the inductor L3, the other end of the inductor L3, one end of the resistor R19 is connected to the emitter of the N-type transistor Q2, the other end of the resistor R9 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q2 is connected to the base of the N-type transistor Q1, the emitter of the N-type transistor Q1 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q1 is connected to the second power supply terminal and the other end of the resistor R18, and one end of the resistor R18 is connected to the base of the N-type transistor Q1;

[0082] The second pin of the first relay is connected to one end of the bidirectional transient suppression diode TVS5, the other end of the bidirectional transient suppression diode TVS5 is connected to the seventh pin of the second relay, and the sixth pin of the second relay is connected to the input terminal J12B;

[0083] One end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L8, the other end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L12, the other end of the inductor L8 is connected to one end of the capacitor C53, and the other end of the capacitor C53 is connected to the other end of the inductor L12;

[0084] The capacitor C53 is also connected in parallel with the electrolytic capacitor E3 and the capacitor C54. The capacitor C54 is connected to the oscillation module, wherein the positive electrode of the electrolytic capacitor E3 is connected to one end of the capacitor C53.

[0085] Furthermore, if Figure 2 As shown, the acquisition and conversion module 22 includes: a bidirectional transient suppression diode TVS2, a bidirectional transient suppression diode TVS3, an inductor L9, an inductor L11, a capacitor C42, a self-recovery fuse F2, a capacitor C40, a common-mode inductor L10, a capacitor C15, a resistor R62, a capacitor C16, a first amplifier, a variable resistor RT1, a variable resistor RT2, a resistor R66, a capacitor C41, a resistor R67, a resistor R28, a capacitor C22, a resistor R29, a resistor R20, a resistor R32, a resistor R33, a resistor R30, a resistor R31, a resistor R34, a second amplifier, a resistor R35, a capacitor C23, a resistor R36, a resistor R37, an N-type field effect transistor MQ6, and an N-type field effect transistor MQ7;

[0086] One end of the bidirectional transient suppression diode TVS2 is connected to the fourth pin of the first relay, and the other end of the bidirectional transient suppression diode TVS2 is connected to the fifth pin of the second relay; the other end of the bidirectional transient suppression diode TVS2 is also connected to the input terminal J111A, one end of the inductor L9, and one end of the bidirectional transient suppression diode TVS3; the other end of the bidirectional transient suppression diode TVS3 is connected to the input terminal J11B and one end of the inductor L11; the bidirectional transient suppression diode TVS3 is also connected in parallel with the capacitor C42;

[0087] The other end of the inductor L9 is connected to one end of the resettable fuse F2, the other end of the resettable fuse F2 is connected to one end of the capacitor C40, the other end of the capacitor C40 is connected to the other end of the inductor L11, one end of the capacitor C40 is also connected to the second end of the common-mode inductor L10, and the other end of the capacitor C40 is also connected to the first end of the common-mode inductor L10;

[0088] The third and fourth ends of the common-mode inductor L10 are connected in parallel to the capacitor C15. The capacitor C15 is connected in parallel to the resistor R62. One end of the resistor R62 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to one end of the capacitor C16 and the third pin of the first amplifier. The other end of the capacitor C16 is connected to the resistor R62 and the second ground terminal GND2.

[0089] A first pin of the first amplifier is connected to one end of the resistor RT1, an eighth pin of the first amplifier is connected to one end of the resistor RT2, and a seventh pin of the first amplifier is connected to the other end of the resistor RT1, the other end of the resistor RT2, and the positive electrode of the third power supply. A second pin of the first amplifier is connected to one end of the resistor R66 and one end of the resistor R67. A sixth pin of the first amplifier is connected to one end of the resistor R28 and the other end of the resistor R66. The other end of the resistor R67 is grounded. A fourth pin of the first amplifier is connected to the negative electrode of the third power supply. A capacitor C41 is connected in parallel with the resistor R66.

[0090] One end of the capacitor C22 is connected to the other end of the resistor R28, and the other end of the capacitor C22 is connected to the second ground terminal GND2; the resistors R29, R20, R32, and R33 are connected in series and in parallel with the capacitor C22; the resistor R30 is connected in parallel with the resistor R29, and the resistor R31 is connected in parallel with the resistor R20 and in series with the resistor R30;

[0091] The third pin of the second amplifier is connected to the circuit connecting resistor R30 and resistor R31 and the circuit connecting resistor R29 and resistor R20 in sequence; the second pin of the second amplifier is connected to one end of resistor R34 and one end of capacitor C23, and the other end of resistor R34 is connected to the second ground terminal GND2; the seventh pin of the second amplifier is connected to the positive electrode of the third power supply terminal, and the fourth pin of the second amplifier is connected to the negative electrode of the third power supply terminal; the sixth pin of the second amplifier is connected to one end of resistor R35, the other end of resistor R35 is connected to the other end of capacitor C23 and the gate of N-type field effect transistor MQ6, the source of N-type field effect transistor MQ6 is connected to one end of resistor R36, and the other end of resistor R36 is connected to the circuit connecting capacitor C23 and resistor R34;

[0092] The gate of the N-type field effect transistor MQ7 is connected to the other end of the capacitor R35, the source of the N-type field effect transistor MQ7 is connected to one end of the resistor R37, and the other end of the resistor R37 is connected to the circuit connecting the capacitor C23 and the resistor R34; the drain of the N-type field effect transistor MQ6 and the drain of the N-type field effect transistor MQ7 are connected to the oscillation module 24.

[0093] Furthermore, if Figure 3 As shown, the oscillation module 24 includes: a diode D8, a capacitor C55, a resistor R38, a resistor R39, a capacitor C24, a capacitor C25, a diode D11B, a diode D11A, a capacitor C26, an inductor L5A, an N-type transistor Q3A, a P-type transistor Q3B, an inductor L5B, a capacitor C27 and a capacitor C28;

[0094] The anode of diode D8 is connected to the first power supply terminal, the cathode of diode D8 is connected to one end of resistor R38 and one end of capacitor C55, capacitor C55 is connected in parallel with capacitor C54, the other end of resistor R38 is connected to one end of capacitor C24, the other end of capacitor C24 is connected to one end of capacitor C25, the other end of capacitor C25 is connected to the other end of resistor R39, and the other end of resistor R39 is connected to the other end of capacitor C55;

[0095] The cathode of diode D11B is connected to one end of capacitor C24, the anode of diode D11B is connected to the other end of capacitor C24, the cathode of diode D11A is connected to one end of capacitor C25, the anode of diode D11A is connected to the other end of capacitor C25, the anode of diode D11B is connected to the cathode of diode D11A, the anode of diode D11B and the cathode of diode D11A are connected to one end of capacitor C26 and one end of inductor L5A; the other end of capacitor C26 and the other end of inductor L5A are connected. are all connected to the emitter of the N-type transistor Q3A, the emitter of the N-type transistor Q3A is further connected to one end of the inductor L5B and the emitter of the P-type transistor Q3B, the base of the N-type transistor Q3A is connected to the cathode of the diode D11B, the collector of the N-type transistor Q3A is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the capacitor C28, the other end of the capacitor C28 is connected to the collector of the P-type transistor Q3B, and the base of the P-type transistor Q3B is connected to the anode of the diode D11A;

[0096] The other end of the inductor L5B and one end of the capacitor C28 are connected to the first end and the fifth end of the third mutual inductor, respectively.

[0097] Furthermore, if Figure 3 As shown, the output circuit 31 includes: a diode D12A, a diode D12B, a capacitor C30, a capacitor C31, a capacitor C29, a capacitor C32, a common-mode inductor L7, a capacitor C52, a self-recovery fuse F3 and a bidirectional transient suppression diode TVS4;

[0098] The sixth terminal of the third mutual inductor is connected to the anode of the diode D12A and the cathode of the diode D12B, and the tenth terminal of the third mutual inductor is connected to the first ground terminal GNO1;

[0099] Diode D12A and diode D12B are connected in series, two ends of capacitor C30 are connected to the positive electrode of diode D12A and the negative electrode of diode D12B respectively, capacitor C31 is connected in series with capacitor C30, and the other end of capacitor C31 is connected to the first ground terminal GNO1; capacitor C32 is connected in parallel with capacitor C30, capacitor C29 is connected in series with capacitor C32, and one end of capacitor C29 is connected to the first ground terminal GNO1, the first and second ends of common-mode inductor L7 are connected to two ends of capacitor C32, the third and fourth ends of common-mode inductor L7 are connected to two ends of capacitor C52, one end of capacitor C52 is connected to one end of self-recovery fuse F3, the other end of self-recovery fuse F3 is connected to one end of bidirectional transient suppressor diode TVS4, the other end of bidirectional transient suppressor diode TVS4 is connected to the other end of capacitor C52, and the two ends of bidirectional transient suppressor diode TVS4 are connected to the two output ends.

[0100] In this embodiment, when the isolator is used as a passive product, the active signal generated by the transmitter is input through input terminals J12A and J12B. When the isolator is used as an active product, the passive signal generated by the transmitter is input through input terminals J12A and J12B, and the active signal generated by the transmitter is input through input terminals J11A and J11B.

[0101] Furthermore, if Figure 4 As shown, the voltage conversion circuit 11 includes: a bus power supply terminal, a bidirectional transient suppression diode TVS1, a capacitor C1, a common mode inductor L6, a capacitor C7, an inductor L1, an inductor L4, a self-recovery fuse F1, a diode D1, a capacitor C6, an electrolytic capacitor E1, a capacitor C2, a resistor R1, a resistor R2, a capacitor C3, a power chip IC1, a capacitor C4, a Schottky diode D2, an inductor L2, a resistor R3, a resistor R4, a resistor R5, a capacitor C38, a capacitor C37, an electrolytic capacitor E2, a voltage regulator diode Z1, a resistor R6, a capacitor C5 and an oscillation chip IC2

[0102] The fourth and fifth pins of the bus power supply terminal J16 are connected to the positive and negative electrodes of the power supply, respectively. Two ends of the bidirectional transient suppressor diode TVS1 are connected to the fourth and fifth pins of the bus power supply terminal J16. The capacitor C1 is connected in parallel with the bidirectional transient suppressor diode TVS1. Two ends of the capacitor C1 are connected to the first and second ends of the common-mode inductor L6. The third and fourth ends of the common-mode inductor L6 are connected to two ends of the capacitor C7. One end of the capacitor C7 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the resettable fuse F1. The other end of the resettable fuse F1 is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to the other end of the inductor L4. One end of the inductor L4 is connected to the other end of the capacitor C7.

[0103] Electrolytic capacitor E1 is connected in parallel with capacitor C6, capacitor C2 is connected in parallel with electrolytic capacitor E1, one end of capacitor C2 is also connected to one end of resistor R1, the other end of resistor R2 is connected to one end of resistor R2, the other end of resistor R2 is connected to the other end of capacitor C2, both ends of resistor R1 are also connected to the VIN terminal and EN terminal of power chip IC1 respectively, capacitor C3 is connected in parallel with resistor R2, the other end of capacitor C3 is connected to the GND terminal of power chip IC1, and the GND terminal of power chip IC1 is grounded;

[0104] The BST terminal and SW terminal of the power chip IC1 are respectively connected to the two ends of the capacitor C4, the end of the capacitor C4 connected to the SW terminal is connected to one end of the inductor L2 and the cathode of the Schottky diode D2, the anode of the Schottky diode D2 is grounded and connected to one end of the resistor R5, the other end of the resistor R5 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3 and the FB terminal of the power chip IC1, the other end of the resistor R3 is connected to the other end of the inductor L2, the other end of the inductor L2 is connected to one end of the capacitor C38, and the other end of the capacitor C38 is connected to one end of the resistor R5;

[0105] Capacitor C37 is connected in parallel with capacitor C38, electrolytic capacitor E2 is connected in parallel with capacitor C37, the positive electrode of electrolytic capacitor E2 is connected to the negative electrode of voltage regulator Z1, the positive electrode of voltage regulator Z1 is connected to the fourth pin, fifth pin, fourteenth pin and sixth pin of oscillation chip IC2, the tenth pin and eleventh pin of oscillation chip IC2 are connected to transformer coil drive circuit 12, the first pin and third pin of oscillation chip IC2 are connected to the two ends of capacitor C5, the second pin and third pin of oscillation chip IC2 are connected to the two ends of resistor R6, and the eighth pin, ninth pin, seventh pin and twelfth pin of oscillation chip IC2 are all connected to the negative electrode of electrolytic capacitor E2.

[0106] Furthermore, the transformer coil driving circuit 12 includes: a diode D16, a resistor R7, a resistor R9, a diode D17, a resistor R8, a resistor R10, an N-type field effect transistor MQ1 and an N-type field effect transistor MQ2;

[0107] The cathode of diode D16 and one end of resistor R7 are both connected to the tenth pin of oscillation chip IC2, the anode of diode D16 is connected to the other end of resistor R7, the anode of diode D16 is also connected to one end of resistor R8, the other end of resistor R8 is connected to the twelfth pin of oscillation chip IC2, the eleventh pin of oscillation chip IC2 is connected to one end of resistor R9 and the cathode of diode D17, the other end of resistor R9 is connected to the anode of diode D17, the anode of diode D17 is also connected to resistor R10 and the gate of N-type field effect transistor MQ2, the other end of resistor R10 is connected to the other end of resistor R8, the drain of N-type field effect transistor MQ2 is connected to the third end of one end of transformer 13, and the source of N-type field effect transistor MQ2 is connected to the other end of resistor R10 and the source of N-type field effect transistor MQ1;

[0108] The gate of the N-type field effect transistor MQ1 is connected to one end of the resistor R8, the drain of the N-type field effect transistor MQ1 is connected to the first end of one end of the transformer 13, and the second end of one end of the transformer 13 is connected to the cathode of the voltage regulator tube Z1.

[0109] Furthermore, the first AC voltage rectification and filtering circuit 14 includes: a diode D5A, a diode D5B, a diode D6A, a diode D6B, a capacitor C14, a capacitor C17, a capacitor C18 and a resistor R17;

[0110] The ninth terminal of the other end of the transformer 13 is connected to the cathode of the diode D6A, and the tenth terminal of the other end of the transformer 13 is connected to the cathode of the diode D5A;

[0111] The anode of diode D5A is connected to the anode of diode D6A, the cathode of diode D5A is connected to the anode of diode D5B, the cathode of diode D5B is connected to the cathode of diode D6B, the anode of diode D6B is connected to the cathode of diode D6A, the anode of diode D6A is connected to one end of capacitor C14, the cathode of diode D6B is connected to the other end of capacitor C14, capacitor C17 is connected in parallel with capacitor C14, capacitor C18 is connected in parallel with capacitor C17, one end of capacitor C18 connected to the anode of diode D6A is connected to the second ground GND2, one end of resistor R17 is connected to one end of capacitor C18 and to the first power supply end, and the other end of resistor R17 is connected to one end of capacitor C18 connected to the second ground GND2.

[0112] Furthermore, the second AC voltage rectification and filtering circuit 15 includes: a diode D4A, a diode D4B, a capacitor C12, a capacitor C13, a capacitor C19 and a resistor R16;

[0113] The eighth terminal of the other end of the transformer 13 is connected to the anode of the diode D4A, the cathode of the diode D4A is connected to one end of the capacitor C12, and the other end of the capacitor C12 is connected to the seventh terminal of the other end of the transformer 13; the anode and cathode of the diode D4A are connected to the anode and cathode of the diode D4B, respectively; the capacitor C13 is connected in parallel with the capacitor C12, the capacitor C19 is connected in parallel with the capacitor C13, the other end of the resistor R16 connected in parallel with the capacitor C19 is connected to the capacitor, the end of the resistor R16 connected to the capacitor C12 is connected to the second ground terminal GND2, and the other end of the resistor R16 is connected to the second power supply terminal;

[0114] The third AC voltage rectification and filtering circuit 16 includes a diode D3A, a diode D3B, a capacitor C10, a capacitor C11, a capacitor C20, a capacitor C33, a capacitor C21, a capacitor C34, a capacitor C35, a capacitor C36, a resistor R15, and a light-emitting diode.

[0115] A fifth terminal of the other end of the transformer 13 is connected to the second ground terminal GND2. A sixth terminal of the other end of the transformer 13 is connected to the anode of the diode D3B. The cathode of the diode D3B is connected to one end of the capacitor C10. The other end of the capacitor C10 is connected to one end of the capacitor C11 and the second ground terminal GND2. The other end of the capacitor C11 is connected to the anode of the diode D3A. The cathode of the diode D3A is connected to the anode of the diode D3B.

[0116] Capacitor C20 is connected in parallel with capacitor C10, capacitor C33 is connected in series with capacitor C20 and in parallel with capacitor C11, capacitor C21 is connected in parallel with capacitor C20, capacitor C34 is connected in series with capacitor C21 and in parallel with capacitor C33, capacitor C35 is connected in parallel with capacitor C21, capacitor C36 is connected in series with capacitor C35 and in parallel with capacitor C34, capacitor C35 is connected in series with resistor R15 and a light-emitting diode, and the negative electrode of the light-emitting diode is connected to the series circuit between capacitor C35 and capacitor C36; the series circuit directly connected between capacitor C35 and resistor R15 is connected to the positive electrode of the third power supply terminal, and the series circuit directly connected between capacitor C35 and resistor R15 is also connected to the positive electrode of the third power supply terminal, and one end of capacitor C36 connected to the positive electrode of diode D3A is connected to the negative electrode of the third power supply terminal.

[0117] In this embodiment, the circuit driving and isolating transformer 13 primarily consists of transistors (Q3A, Q3B) and transformer 13 (T3). This circuitry drives transformer 13 and implements signal isolation and transmission. Transformer 13 coupling provides electrical isolation between input and output, thereby enhancing the system's anti-interference capabilities.

[0118] The rectifier and filter circuit is on the right side of transformer 13 and is composed of a combination of diodes and capacitors (such as D12A, D12B, C29, C30, etc.). It is used for rectification and filtering, converting the AC signal of the secondary of transformer 13 into a DC signal and removing ripple through the filter capacitor.

[0119] The TVS diode (TVS4) at the output port of output circuit 31 provides overvoltage protection at the output, preventing external overvoltage from affecting subsequent circuits. Resettable fuse F3 provides overcurrent protection, and common-mode inductor L7 filters out common-mode interference, ensuring system stability and safety.

[0120] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0121] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0122] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0123] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0124] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0125] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An active-passive automatic switching isolator, characterized in that: include: Power conversion circuit, input acquisition circuit and output circuit; The input acquisition circuit includes: an input switching module, an acquisition conversion module and an oscillation module; The input switching module is connected to the acquisition and conversion module or the oscillation module, and is used to switch the connection according to the input active signal or the passive signal to send the input signal to the acquisition and conversion module or the oscillation module; The acquisition and conversion module is connected to the oscillation module and is used to convert and amplify the current signal of the active signal or the passive signal and input it into the oscillation module; The oscillation module is connected to the output circuit via a third mutual inductor; The power conversion circuit is used to provide power to the input switching module, the acquisition conversion module and the oscillation module, and to distribute power to the input passive signal through the input switching module; The input switching module includes: a first relay, a second relay, a diode D7, a capacitor C56, an inductor L3, a resistor R19, an N-type transistor Q2, an N-type transistor Q1, a resistor R18, a bidirectional transient suppression diode TVS5, an inductor L8, an inductor L12, a capacitor C53, an electrolytic capacitor E3, a capacitor C54 and a capacitor C55; The first pin of the first relay is connected to one end of the capacitor C56 and the third power supply terminal, the eighth pin is connected to the other end of the capacitor C56 and the second ground terminal GND2, and the capacitor C56 is further connected to the diode D7 in parallel; The third pin of the first relay is connected to the input terminal J12A, the fourth pin of the first relay is connected to one end of the inductor L3, the other end of the inductor L3, one end of the resistor R19 is connected to the emitter of the N-type transistor Q2, the other end of the resistor R9 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q2 is connected to the base of the N-type transistor Q1, the emitter of the N-type transistor Q1 is connected to the base of the N-type transistor Q2, the collector of the N-type transistor Q1 is connected to the second power supply terminal and the other end of the resistor R18, and one end of the resistor R18 is connected to the base of the N-type transistor Q1; The second pin of the first relay is connected to one end of the bidirectional transient suppression diode TVS5, the other end of the bidirectional transient suppression diode TVS5 is connected to the seventh pin of the second relay, and the sixth pin of the second relay is connected to the input terminal J12B; One end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L8, the other end of the bidirectional transient suppression diode TVS5 is also connected to one end of the inductor L12, the other end of the inductor L8 is connected to one end of the capacitor C53, and the other end of the capacitor C53 is connected to the other end of the inductor L12; The capacitor C53 is also connected in parallel with the electrolytic capacitor E3 and the capacitor C54. The capacitor C54 is connected to the oscillation module, wherein the positive electrode of the electrolytic capacitor E3 is connected to one end of the capacitor C53.

2. The active-passive automatic switching isolator according to claim 1, characterized in that: The acquisition and conversion module includes: a bidirectional transient suppression diode TVS2, a bidirectional transient suppression diode TVS3, an inductor L9, an inductor L11, a capacitor C42, a self-recovery fuse F2, a capacitor C40, a common-mode inductor L10, a capacitor C15, a resistor R62, a capacitor C16, a first amplifier, a variable resistor RT1, a variable resistor RT2, a resistor R66, a capacitor C41, a resistor R67, a resistor R28, a capacitor C22, a resistor R29, a resistor R20, a resistor R32, a resistor R33, a resistor R30, a resistor R31, a resistor R34, a second amplifier, a resistor R35, a capacitor C23, a resistor R36, a resistor R37, an N-type field effect transistor MQ6, and an N-type field effect transistor MQ7; One end of the bidirectional transient suppression diode TVS2 is connected to the fourth pin of the first relay, and the other end of the bidirectional transient suppression diode TVS2 is connected to the fifth pin of the second relay; the other end of the bidirectional transient suppression diode TVS2 is also connected to the input terminal J11A, one end of the inductor L9, and one end of the bidirectional transient suppression diode TVS3; the other end of the bidirectional transient suppression diode TVS3 is connected to the input terminal J11B and one end of the inductor L11; the bidirectional transient suppression diode TVS3 is also connected in parallel with the capacitor C42; The other end of the inductor L9 is connected to one end of the resettable fuse F2, the other end of the resettable fuse F2 is connected to one end of the capacitor C40, the other end of the capacitor C40 is connected to the other end of the inductor L11, one end of the capacitor C40 is also connected to the second end of the common-mode inductor L10, and the other end of the capacitor C40 is also connected to the first end of the common-mode inductor L10; The third and fourth ends of the common-mode inductor L10 are connected in parallel to the capacitor C15. The capacitor C15 is connected in parallel to the resistor R62. One end of the resistor R62 is connected to one end of the resistor R64. The other end of the resistor R64 is connected to one end of the capacitor C16 and the third pin of the first amplifier. The other end of the capacitor C16 is connected to the resistor R62 and the second ground terminal GND2. A first pin of the first amplifier is connected to one end of the resistor RT1, an eighth pin of the first amplifier is connected to one end of the resistor RT2, and a seventh pin of the first amplifier is connected to the other end of the resistor RT1, the other end of the resistor RT2, and the positive electrode of the third power supply. A second pin of the first amplifier is connected to one end of the resistor R66 and one end of the resistor R67. A sixth pin of the first amplifier is connected to one end of the resistor R28 and the other end of the resistor R66. The other end of the resistor R67 is grounded. A fourth pin of the first amplifier is connected to the negative electrode of the third power supply. A capacitor C41 is connected in parallel with the resistor R66. One end of the capacitor C22 is connected to the other end of the resistor R28, and the other end of the capacitor C22 is connected to the second ground terminal GND2; the resistors R29, R20, R32, and R33 are connected in series in sequence and in parallel with the capacitor C22; the resistor R30 is connected in parallel with the resistor R29, and the resistor R31 is connected in parallel with the resistor R20 and in series with the resistor R30; The third pin of the second amplifier is connected to the circuit connecting resistor R30 and resistor R31 and the circuit connecting resistor R29 and resistor R20 in sequence; the second pin of the second amplifier is connected to one end of resistor R34 and one end of capacitor C23, and the other end of resistor R34 is connected to the second ground terminal GND2; the seventh pin of the second amplifier is connected to the positive electrode of the third power supply terminal, and the fourth pin of the second amplifier is connected to the negative electrode of the third power supply terminal; the sixth pin of the second amplifier is connected to one end of resistor R35, the other end of resistor R35 is connected to the other end of capacitor C23 and the gate of N-type field effect transistor MQ6, the source of N-type field effect transistor MQ6 is connected to one end of resistor R36, and the other end of resistor R36 is connected to the circuit connecting capacitor C23 and resistor R34; The gate of the N-type field effect transistor MQ7 is connected to the other end of the capacitor R35, the source of the N-type field effect transistor MQ7 is connected to one end of the resistor R37, and the other end of the resistor R37 is connected to the circuit connecting the capacitor C23 and the resistor R34; the drain of the N-type field effect transistor MQ6 and the drain of the N-type field effect transistor MQ7 are connected to the oscillation module.

3. The active-passive automatic switching isolator according to claim 2, characterized in that: The oscillation module includes: a diode D8, a capacitor C55, a resistor R38, a resistor R39, a capacitor C24, a capacitor C25, a diode D11B, a diode D11A, a capacitor C26, an inductor L5A, an N-type transistor Q3A, a P-type transistor Q3B, an inductor L5B, a capacitor C27, and a capacitor C28; The anode of diode D8 is connected to the first power supply terminal, the cathode of diode D8 is connected to one end of resistor R38 and one end of capacitor C55, capacitor C55 is connected in parallel with capacitor C54, the other end of resistor R38 is connected to one end of capacitor C24, the other end of capacitor C24 is connected to one end of capacitor C25, the other end of capacitor C25 is connected to the other end of resistor R39, and the other end of resistor R39 is connected to the other end of capacitor C55; The cathode of diode D11B is connected to one end of capacitor C24, the anode of diode D11B is connected to the other end of capacitor C24, the cathode of diode D11A is connected to one end of capacitor C25, the anode of diode D11A is connected to the other end of capacitor C25, the anode of diode D11B is connected to the cathode of diode D11A, the anode of diode D11B and the cathode of diode D11A are connected to one end of capacitor C26 and one end of inductor L5A; the other end of capacitor C26 and the other end of inductor L5A are connected. are all connected to the emitter of the N-type transistor Q3A, the emitter of the N-type transistor Q3A is further connected to one end of the inductor L5B and the emitter of the P-type transistor Q3B, the base of the N-type transistor Q3A is connected to the cathode of the diode D11B, the collector of the N-type transistor Q3A is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the capacitor C28, the other end of the capacitor C28 is connected to the collector of the P-type transistor Q3B, and the base of the P-type transistor Q3B is connected to the anode of the diode D11A; The other end of the inductor L5B and one end of the capacitor C28 are connected to the first end and the fifth end of the third mutual inductor, respectively.

4. The active-passive automatic switching isolator according to claim 3, characterized in that: The output circuit includes: a diode D12A, a diode D12B, a capacitor C30, a capacitor C31, a capacitor C29, a capacitor C32, a common-mode inductor L7, a capacitor C52, a self-recovery fuse F3, and a bidirectional transient suppression diode TVS4; The sixth terminal of the third mutual inductor is connected to the anode of the diode D12A and the cathode of the diode D12B, and the tenth terminal of the third mutual inductor is connected to the first ground terminal GNO1; Diode D12A and diode D12B are connected in series, two ends of capacitor C30 are connected to the positive electrode of diode D12A and the negative electrode of diode D12B respectively, capacitor C31 is connected in series with capacitor C30, and the other end of capacitor C31 is connected to the first ground terminal GNO1; capacitor C32 is connected in parallel with capacitor C30, capacitor C29 is connected in series with capacitor C32, and one end of capacitor C29 is connected to the first ground terminal GNO1, the first and second ends of common-mode inductor L7 are connected to two ends of capacitor C32, the third and fourth ends of common-mode inductor L7 are connected to two ends of capacitor C52, one end of capacitor C52 is connected to one end of self-recovery fuse F3, the other end of self-recovery fuse F3 is connected to one end of bidirectional transient suppressor diode TVS4, the other end of bidirectional transient suppressor diode TVS4 is connected to the other end of capacitor C52, and the two ends of bidirectional transient suppressor diode TVS4 are connected to the two output ends.

5. The active-passive automatic switching isolator according to claim 4, characterized in that: The power conversion circuit includes: a voltage conversion circuit, a transformer coil drive circuit, a transformer, a first AC voltage rectification and filtering circuit, a second AC voltage rectification and filtering circuit, and a third AC voltage rectification and filtering circuit; The voltage conversion circuit is connected to the transformer coil drive circuit, the transformer coil drive circuit is connected to one end of the transformer, and the other end of the transformer is connected to the first AC voltage rectification and filtering circuit, the second AC voltage rectification and filtering circuit, and the third AC voltage rectification and filtering circuit; The first AC voltage rectification and filtering circuit is used to provide power to the oscillation module; The second AC voltage rectifier and filter circuit distributes power to the input passive signal through the input switching module; The third AC voltage rectification and filtering circuit is used to provide power to the input switching module and the acquisition and conversion module.

6. The active-passive automatic switching isolator according to claim 5, characterized in that: The voltage conversion circuit includes: a bus power supply terminal, a bidirectional transient suppression diode TVS1, a capacitor C1, a common mode inductor L6, a capacitor C7, an inductor L1, an inductor L4, a self-recovery fuse F1, a diode D1, a capacitor C6, an electrolytic capacitor E1, a capacitor C2, a resistor R1, a resistor R2, a capacitor C3, a power chip, a capacitor C4, a Schottky diode D2, an inductor L2, a resistor R3, a resistor R4, a resistor R5, a capacitor C38, a capacitor C37, an electrolytic capacitor E2, a voltage regulator Z1, a resistor R6, a capacitor C5 and an oscillation chip The fourth and fifth pins of the bus power supply terminal are connected to the positive and negative electrodes of the power supply, respectively. Two ends of the bidirectional transient suppressor diode TVS1 are connected to the fourth and fifth pins of the bus power supply terminal. The capacitor C1 is connected in parallel with the bidirectional transient suppressor diode TVS1. Two ends of the capacitor C1 are connected to the first and second ends of the common-mode inductor L6. The third and fourth ends of the common-mode inductor L6 are connected to two ends of the capacitor C7. One end of the capacitor C7 is connected to one end of the inductor L1. The other end of the inductor L1 is connected to one end of the resettable fuse F1. The other end of the resettable fuse F1 is connected to the positive electrode of the diode D1. The negative electrode of the diode D1 is connected to one end of the capacitor C6. The other end of the capacitor C6 is connected to the other end of the inductor L4. One end of the inductor L4 is connected to the other end of the capacitor C7. Electrolytic capacitor E1 is connected in parallel with capacitor C6, capacitor C2 is connected in parallel with electrolytic capacitor E1, one end of capacitor C2 is also connected to one end of resistor R1, the other end of resistor R2 is connected to one end of resistor R2, the other end of resistor R2 is connected to the other end of capacitor C2, both ends of resistor R1 are also connected to the VIN terminal and EN terminal of the power chip respectively, capacitor C3 is connected in parallel with resistor R2, the other end of capacitor C3 is connected to the GND terminal of the power chip, and the GND terminal of the power chip is grounded; The BST terminal and SW terminal of the power chip are respectively connected to the two ends of capacitor C4, the end of capacitor C4 connected to the SW terminal is connected to one end of inductor L2 and the cathode of Schottky diode D2, the anode of Schottky diode D2 is grounded and connected to one end of resistor R5, the other end of resistor R5 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R3 and the FB terminal of the power chip, the other end of resistor R3 is connected to the other end of inductor L2, the other end of inductor L2 is connected to one end of capacitor C38, and the other end of capacitor C38 is connected to one end of resistor R5; Capacitor C37 is connected in parallel with capacitor C38, electrolytic capacitor E2 is connected in parallel with capacitor C37, the positive electrode of electrolytic capacitor E2 is connected to the negative electrode of voltage regulator Z1, the positive electrode of voltage regulator Z1 is connected to the fourth pin, fifth pin, fourteenth pin and sixth pin of the oscillation chip, the tenth pin and eleventh pin of the oscillation chip are connected to the transformer coil drive circuit, the first pin and third pin of the oscillation chip are connected to the two ends of capacitor C5, the second pin and third pin of the oscillation chip are connected to the two ends of resistor R6, and the eighth pin, ninth pin, seventh pin and twelfth pin of the oscillation chip are all connected to the negative electrode of electrolytic capacitor E2.

7. The active-passive automatic switching isolator according to claim 6, characterized in that: The transformer coil drive circuit includes: a diode D16, a resistor R7, a resistor R9, a diode D17, a resistor R8, a resistor R10, an N-type field effect transistor MQ1 and an N-type field effect transistor MQ2; The cathode of diode D16 and one end of resistor R7 are both connected to the tenth pin of the oscillation chip, the anode of diode D16 is connected to the other end of resistor R7, the anode of diode D16 is also connected to one end of resistor R8, the other end of resistor R8 is connected to the twelfth pin of the oscillation chip, the eleventh pin of the oscillation chip is connected to one end of resistor R9 and the cathode of diode D17, the other end of resistor R9 is connected to the anode of diode D17, the anode of diode D17 is also connected to resistor R10 and the gate of N-type field effect transistor MQ2, the other end of resistor R10 is connected to the other end of resistor R8, the drain of N-type field effect transistor MQ2 is connected to the third terminal at one end of the transformer, and the source of N-type field effect transistor MQ2 is connected to the other end of resistor R10 and the source of N-type field effect transistor MQ1; The gate of the N-type field effect transistor MQ1 is connected to one end of the resistor R8, the drain of the N-type field effect transistor MQ1 is connected to the first end of one end of the transformer, and the second end of one end of the transformer is connected to the negative electrode of the voltage regulator tube Z1.

8. The active-passive automatic switching isolator according to claim 7, characterized in that: The first AC voltage rectification and filtering circuit includes: a diode D5A, a diode D5B, a diode D6A, a diode D6B, a capacitor C14, a capacitor C17, a capacitor C18 and a resistor R17; The ninth terminal on the other end of the transformer is connected to the cathode of diode D6A, and the tenth terminal on the other end of the transformer is connected to the cathode of diode D5A; The anode of diode D5A is connected to the anode of diode D6A, the cathode of diode D5A is connected to the anode of diode D5B, the cathode of diode D5B is connected to the cathode of diode D6B, the anode of diode D6B is connected to the cathode of diode D6A, the anode of diode D6A is connected to one end of capacitor C14, the cathode of diode D6B is connected to the other end of capacitor C14, capacitor C17 is connected in parallel with capacitor C14, capacitor C18 is connected in parallel with capacitor C17, one end of capacitor C18 connected to the anode of diode D6A is connected to the second ground GND2, one end of resistor R17 is connected to one end of capacitor C18 and to the first power supply end, and the other end of resistor R17 is connected to one end of capacitor C18 connected to the second ground GND2.

9. The active-passive automatic switching isolator according to claim 8, characterized in that: The second AC voltage rectification and filtering circuit includes: a diode D4A, a diode D4B, a capacitor C12, a capacitor C13, a capacitor C19 and a resistor R16; The eighth terminal at the other end of the transformer is connected to the anode of diode D4A, the cathode of diode D4A is connected to one end of capacitor C12, and the other end of capacitor C12 is connected to the seventh terminal at the other end of the transformer; the anode and cathode of diode D4A are connected to the anode and cathode of diode D4B, respectively; capacitor C13 is connected in parallel with capacitor C12, capacitor C19 is connected in parallel with capacitor C13, the other end of resistor R16 connected in parallel with capacitor C19 is connected to capacitor C13, one end of resistor R16 connected to capacitor C12 is connected to the second ground terminal GND2, and the other end of resistor R16 is connected to the second power supply terminal; The third AC voltage rectification and filtering circuit includes: a diode D3A, a diode D3B, a capacitor C10, a capacitor C11, a capacitor C20, a capacitor C33, a capacitor C21, a capacitor C34, a capacitor C35, a capacitor C36, a resistor R15 and a light-emitting diode; A fifth terminal at the other end of the transformer is connected to the second ground terminal GND2, a sixth terminal at the other end of the transformer is connected to the anode of diode D3B, the cathode of diode D3B is connected to one end of capacitor C10, the other end of capacitor C10 is connected to one end of capacitor C11 and the second ground terminal GND2, the other end of capacitor C11 is connected to the anode of diode D3A, and the cathode of diode D3A is connected to the anode of diode D3B; Capacitor C20 is connected in parallel with capacitor C10, capacitor C33 is connected in series with capacitor C20 and in parallel with capacitor C11, capacitor C21 is connected in parallel with capacitor C20, capacitor C34 is connected in series with capacitor C21 and in parallel with capacitor C33, capacitor C35 is connected in parallel with capacitor C21, capacitor C36 is connected in series with capacitor C35 and in parallel with capacitor C34, capacitor C35 is connected in series with resistor R15 and a light-emitting diode, and the negative electrode of the light-emitting diode is connected to the series circuit between capacitor C35 and capacitor C36; the series circuit directly connected between capacitor C35 and resistor R15 is connected to the positive electrode of the third power supply terminal, and the series circuit directly connected between capacitor C35 and resistor R15 is also connected to the positive electrode of the third power supply terminal, and one end of capacitor C36 connected to the positive electrode of diode D3A is connected to the negative electrode of the third power supply terminal.

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