CN203747655U - Isolated AC-DC signal two-way transmission circuit - Google Patents
Isolated AC-DC signal two-way transmission circuit Download PDFInfo
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- CN203747655U CN203747655U CN201420079977.2U CN201420079977U CN203747655U CN 203747655 U CN203747655 U CN 203747655U CN 201420079977 U CN201420079977 U CN 201420079977U CN 203747655 U CN203747655 U CN 203747655U
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- signal
- direct current
- circuit
- current signal
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Abstract
The utility model relates to an isolated AC-DC signal two-way transmission circuit. A first standard DC signal or a first AC signal superimposed on the first standard DC signal which is outputted by first AC/DC electrical signal sending and receiving equipment is converted to an AC signal through a primary circuit of an DC-to-AC conversion circuit; through isolated transmission to a secondary circuit, the AC signal is converted to a second standard DC signal corresponding to the first standard DC signal or a signal which is superimposed on the second standard DC signal and is corresponding to the first AC signal to be outputted; the second standard AC signal or the signal superimposed on the second standard DC signal and corresponding to the first AC signal is converted through a current or voltage conversion circuit to a corresponding voltage or current signal which is transmitted to second AC/DC electrical signal sending and receiving equipment to complete the transmission; and a second AC signal generated by the second AC/DC electrical sending and receiving equipment is transmitted in an isolated mode through an independent AC signal transmission circuit and converted to a feedback signal superimposed on the standard DC signal, and the feedback signal is transmitted to the first AC/DC electrical signal sending and receiving equipment. Anti-interference ability and reliability of two-way transmission are strengthened.
Description
Technical field
The utility model relates to the transmission technology of curtage AC signal, particularly relates to a kind of isolation alternating current-direct current signal bidirectional transmission circuit.
Background technology
For the AC signal that is generally of the signal transmission of isolation safe grid, as ac voltage signal source or ac current signal source, AC signal and standard signal are superimposed conventionally, by magnetic coupling transmission signal.
First, standard signal is generally direct current signal,, by magnetic coupling transmission, must, after direct current is delivered stream, just can transmit, and after transmission in the past, needs equally AC-DC, is reduced to standard signal.Therefore concerning AC signal transmission channel, because need increase straight-friendship and hand over-straight circuit, this part circuit may produce to AC signal the interference such as decay, the transmission reliability of reduction AC signal.
And, the transmission that is superimposed of AC signal and standard signal, two paths of signals interferes with each other conventionally, such as AC signal transmission can produce certain impact to the transmission precision of standard signal.Some devices in standard signal loop can be decayed or disturb standard signal simultaneously, reduce the transmission reliability of AC signal.
Summary of the invention
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of isolation alternating current-direct current signal bidirectional transmission circuit, solves the poor problem of AC signal transmission reliability in above-mentioned prior art.
For realizing above-mentioned target and other related objectives, the utility model provides a kind of isolation alternating current-direct current signal bidirectional transmission circuit, electricity isolation transmission AC signal between the first alterating and direct current signal sending and receiving devices and the second alterating and direct current signal sending and receiving devices; Wherein, described the first alterating and direct current signal sending and receiving devices, export the first standard direct current signal or be superimposed upon the first AC signal of described the first standard direct current signal, described isolation alternating current-direct current signal bidirectional transmission circuit comprises: direct current becomes alternating current circuit, comprise: primary circuit, for receiving the output of described the first alterating and direct current signal sending and receiving devices and being converted to AC signal output; Secondary circuit is for receiving to isolate the described AC signal that transmission means is sent, and described AC signal is converted to the second standard DC signal output of corresponding the first standard direct current signal, or be converted to the signal output of described the first AC signal of correspondence that is superimposed upon described the second standard direct current signal; Curtage change-over circuit, receives the output of described secondary circuit, and is converted to corresponding voltage or current signal to the second alterating and direct current signal sending and receiving devices, to complete the transmission of the first AC signal to the second alterating and direct current signal sending and receiving devices; Be located at described the second alterating and direct current signal sending and receiving devices, generate the second AC signal; AC signal transmission circuit, connects described AC signal generator and described the first alterating and direct current signal sending and receiving devices; Described AC signal transmission circuit comprises isolation transmitter part, for by described the second AC signal with isolation method transmission and be converted to the voltage or the current signal that are superimposed on described standard direct current signal, to complete the transmission of the second AC signal to the first alterating and direct current signal sending and receiving devices.
Preferably, it is magnetic isolation transmitter part that described direct current becomes alternating current circuit, described primary circuit comprises that the first electric current flows into end and outflow end, and described secondary circuit comprises that the second electric current flows into end and outflow end, and described curtage change-over circuit comprises: the first amplifier, the first triode; The second electric current that the reverse phase input of described the first amplifier is connected in described secondary circuit flows into end, the in-phase input end of described the first amplifier is connected in the second outflow of bus current end of described secondary circuit, and described the second outflow of bus current end is connected to described the second alterating and direct current signal sending and receiving devices; The output of described the first amplifier connects the ground level of described the first triode, and described the first triode is NPN type, and the collector electrode of described the first triode has reference voltage, and the emitter of described the first triode connects the inverting input of described the first amplifier.
Preferably, the AC signal that described the first alterating and direct current signal sending and receiving devices produces comes from the input equipment in the first alterating and direct current signal sending and receiving devices, described isolation transmitter part comprises the U/I change-over circuit, the isolation transmitter part with primary circuit and secondary circuit and the 2nd U/I change-over circuit that connect successively, and described isolation transmitter part is Light Coupled Device.
Preferably, a described U/I change-over circuit comprises: the second amplifier; Described AC signal generator is connected to the in-phase input end of described the second amplifier through capacitor-coupled, the inverting input of described the second amplifier is through the second grounding through resistance, and the output of described the second amplifier is connected to the inverting input of described the second amplifier through the inlet circuit of described isolation transmitter part and the first resistance; The first electric current that the circuit of output terminal of described isolation transmitter part is connected to the primary circuit of described direct current change alternating current circuit by described the 2nd U/I change-over circuit flows into end.
Preferably, described the 2nd U/I change-over circuit comprises: the 3rd amplifier and the second triode, the inverting input of described the 3rd amplifier connects described isolation transmitter part through the 3rd resistance, the first electric current that the in-phase input end of described the 3rd amplifier is connected to the primary circuit of described direct current change alternating current circuit flows into end, the output of described the 3rd amplifier connects the base stage of described the second triode, described the second triode is positive-negative-positive, and the grounded collector of described the second triode and emitter connect the first outflow of bus current end of the primary circuit of described direct current change alternating current circuit.
Preferably, described the second AC signal is to be produced by the AC signal generator that is parallel to load resistance (RL) two ends in the second alterating and direct current signal sending and receiving devices.
As mentioned above, the one isolation alternating current-direct current signal bidirectional transmission circuit that the utility model provides, by the first standard direct current signal of the first alterating and direct current signal sending and receiving devices output or be superimposed upon the primary circuit that the first AC signal of described the first standard direct current signal becomes alternating current circuit by direct current and be converted to AC signal, transfer to secondary circuit and described AC signal be converted to the second standard DC signal output of corresponding the first standard direct current signal by isolation, or the signal output that is converted to described the first AC signal of correspondence that is superimposed upon described the second standard direct current signal is exported, and receive the output of described secondary circuit by curtage change-over circuit, and be converted to corresponding voltage or current signal to the second alterating and direct current signal sending and receiving devices to complete the transmission of the first AC signal, and, described the second alterating and direct current signal sending and receiving devices generate the second AC signal by AC signal transmission circuit independently by described the second AC signal with isolation method transmission and be converted to the feedback signal that is superimposed on described standard direct current signal to complete the transmission of the second AC signal to the first alterating and direct current signal sending and receiving devices, thereby realize the two-way isolation transmission of AC signal, anti-interference and the reliability of AC signal transmission are strengthened.
Brief description of the drawings
Fig. 1 is shown as the structural representation of an embodiment of isolation alternating current-direct current signal bidirectional transmission circuit of the present utility model.
Fig. 2 is shown as the principle schematic of curtage change-over circuit in an embodiment of isolation alternating current-direct current signal bidirectional transmission circuit of the present utility model.
Fig. 3 is shown as the principle schematic of AC signal transmission circuit in an embodiment of isolation alternating current-direct current signal bidirectional transmission circuit of the present utility model.
Element numbers explanation
1 first alterating and direct current signal sending and receiving devices
2 direct currents become alternating current circuit
21 primary circuits
22 secondary circuits
23 isolating devices
3 curtage change-over circuits
4 second alterating and direct current signal sending and receiving devices
41 AC signal generator
5 AC signal transmission circuits
51 the one U/I change-over circuits
52 isolation transmitter parts
The inlet circuit of 521 isolation transmitter parts
The circuit of output terminal of 522 isolation transmitter parts
53 U/I change-over circuits
Embodiment
By specific instantiation, execution mode of the present utility model is described below, those skilled in the art can understand other advantages of the present utility model and effect easily by the disclosed content of this specification.The utility model can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present utility model.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
Refer to Fig. 1, the utility model provides a kind of isolation alternating current-direct current signal bidirectional transmission circuit, electricity isolation transmission AC signal between the first alterating and direct current signal sending and receiving devices 1 and the second alterating and direct current signal sending and receiving devices 4, described the first alterating and direct current signal sending and receiving devices 1, the first AC signal of exporting the first standard direct current signal or together transmitting with described standard direct current signal, in the present embodiment, the i.e. electric current I n as shown in the figure of described standard direct current signal, described isolation alternating current-direct current signal bidirectional transmission circuit can also comprise: direct current becomes alternating current circuit 2, curtage change-over circuit 3, AC signal generator 41 and AC signal transmission circuit 5 etc.
Described direct current becomes alternating current circuit 2, comprising: primary circuit 21, for receiving the output of described the first alterating and direct current signal sending and receiving devices 1 and being converted to AC signal output; Secondary circuit 22 is for receiving to isolate the described AC signal that transmission means is sent, and by described AC signal and be converted to the second standard DC signal output (Io) of corresponding the first standard direct current signal or be superimposed upon the signal output of described first AC signal of correspondence of described the second standard direct current signal, in the present embodiment, described direct current becomes alternating current circuit 2 and comprises the isolating device 23 being located between primary circuit 21 and secondary circuit 22, in the present embodiment, it be magnetic isolation transmitter part 52 that direct current becomes alternating current circuit 2, realizes directly-hand over-directly changes and isolate transmission.
Described curtage change-over circuit 3, receive the output current of described secondary circuit 22, and be converted to corresponding voltage or current signal to the second alterating and direct current signal sending and receiving devices 4, to complete the transmission of the first AC signal to the first alterating and direct current signal sending and receiving devices 1.
Described AC signal generator 41, be located at described the second alterating and direct current signal sending and receiving devices 4, be used for generating the second AC signal, and, between described AC signal generator 41 and described the first alterating and direct current signal sending and receiving devices 1, be also connected with separately AC signal transmission circuit 5; Described AC signal transmission circuit 5 comprises isolation transmitter part, for by described the second AC signal with isolation method transmission and be converted to the feedback signal that is superimposed on described standard direct current signal, to complete the transmission of the second AC signal to the first alterating and direct current signal sending and receiving devices 1.
On the one hand, the AC signal that described the first alterating and direct current signal sending and receiving devices 1 produces comes from the input equipment in the first alterating and direct current signal sending and receiving devices 1, be for example smart machine, control appliance etc., also can be used to receive described the second AC signal.
Below provide again an embodiment that partial circuit implementation of the present utility model is described.
On the one hand, described primary circuit 21 comprises that the first electric current flows into end and outflow end, described secondary circuit 22 comprises that the second electric current flows into end and outflow end, electric current I n in can referenced in schematic: the first standard direct current signal or the first standard direct current signal first AC signal that superposes, electric current I o: the superpose signal of corresponding the first AC signal of the second standard direct current signal or the second standard direct current signal, pass through In, the flow direction of Io can be understood described electric current and flow into end and outflow end, that is to say, in the present embodiment, although above-mentioned direct current signal and AC signal can be current signal, but under actual conditions, also can be voltage signal, only need circuit to do increase load resistance, increase the U/I of power amplifier, the change of those skilled in the art's common technology means such as I/U change-over circuit can complete electric current and voltage and change mutually, therefore be not limited to the present embodiment.
As shown in Figure 2, optional, described curtage change-over circuit 3 comprises: the first amplifier (U1), the first triode (T1), the second electric current that the reverse phase input of described the first amplifier (U1) is connected in described secondary circuit 22 flows into end, the in-phase input end of described the first amplifier (U1) is connected in the second outflow of bus current end of described secondary circuit 22, and described the second outflow of bus current end is connected to described the second alterating and direct current signal sending and receiving devices, the output of described the first amplifier (U1) connects the ground level of described the first triode (T1), described the first triode (T1) is NPN type, the collector electrode of described the first triode (T1) has reference voltage, the emitter of described the first triode (T1) connects the inverting input of described the first amplifier (U1), the first triode (T1) amplifies for output signal power, also feed back to the inverting input of U1 from circuit also known described the first AC signal, feed back in the current circuit in the second alterating and direct current signal sending and receiving devices 4 simultaneously, thereby the first AC signal is changed and is superimposed upon on current signal Io, isolation is transferred on apparatus of load (RL).
As shown in Figure 3, in described AC signal transmission circuit 5, on the one hand, described isolation transmitter part comprises the U/I change-over circuit 51, the isolation transmitter part 52 with inlet circuit 521 and circuit of output terminal 522 and the 2nd U/I change-over circuit 53 that connect successively; Preferably, a described U/I change-over circuit 51 comprises: the second amplifier (U2); Described AC signal generator 41 be voltage source (in other embodiments, also can be current source), output Uw is of coupled connections to the in-phase input end of described the second amplifier (U2) through capacitor (C1), the inverting input of described the second amplifier (U2) is through the second resistance (R2) ground connection, and the output of described the second amplifier (U2) is connected to the inverting input of described the second amplifier (U2) through the inlet circuit 521 of described isolation transmitter part 52 and the first resistance (R1); The first electric current that the circuit of output terminal 522 of described isolation transmitter part 52 is connected to the primary circuit 21 of described direct current change alternating current circuit 2 by described the 2nd U/I change-over circuit 53 flows into end; Preferably, described isolation transmitter part 52 is Light Coupled Device.
On the one hand, described the 2nd U/I change-over circuit 53 comprises: the 3rd amplifier (U3) and the second triode (T2), the inverting input of described the 3rd amplifier (U3) connects described isolation transmitter part 52 through the 3rd resistance (R3), the first electric current that the in-phase input end of described the 3rd amplifier (U3) is connected to the primary circuit 21 of described direct current change alternating current circuit 2 flows into end, the output of described the 3rd amplifier (U3) connects the base stage of described the second triode (T2), described the second triode (T2) is positive-negative-positive, the grounded collector of described the second triode (T2) and emitter connect the first outflow of bus current end of the primary circuit 21 of described direct current change alternating current circuit 2.
Described AC signal generator 41 is parallel to load resistance (RL) in the second alterating and direct current signal sending and receiving devices 4 as the two ends of apparatus of load, so, described AC signal generator 41 is alternating-current voltage sources as shown in the figure, its voltage U w is coupled to the in-phase input end of described the second amplifier (U2) by capacitor (C1), if and described AC signal generator 41 is current source, can be coupled to by the voltage in load in parallel (RL) in-phase input end of described the second amplifier (U2).
Specifically, the AC signal (being alternating voltage Uw in the present embodiment) that AC signal generator 41 in described the second alterating and direct current signal sending and receiving devices 4 is sent, be coupled to the in-phase input end of the second operational amplifier (U2) through capacitor C1, by the output of amplifier, ac voltage signal is superimposed upon on holding wire with the form of voltage, and be transferred to the first alterating and direct current signal sending and receiving devices 1 through light-coupled isolation, make the voltage of the inverting input of the 3rd operational amplifier (U3) that connects the first alterating and direct current signal sending and receiving devices 1 produce identical change, the base stage of (T2) of output termination the second triode of U3, amplify for output signal power, this second AC signal is fed back to the in-phase input end of U1, feed back in the first alterating and direct current signal sending and receiving devices 1 electric current I n loop simultaneously, thereby the second AC signal is reached to the first alterating and direct current signal sending and receiving devices 1.
In sum, the one isolation alternating current-direct current signal bidirectional transmission circuit that the utility model provides, by the first standard direct current signal of the first alterating and direct current signal sending and receiving devices output or be superimposed upon the primary circuit that the first AC signal of described the first standard direct current signal becomes alternating current circuit by direct current and be converted to AC signal, transfer to secondary circuit and described AC signal be converted to the second standard DC signal output of corresponding the first standard direct current signal or be superimposed upon the signal output output of described first AC signal of correspondence of described the second standard direct current signal by isolation, and receive the output of described secondary circuit by curtage change-over circuit, and be converted to corresponding voltage or current signal to the second alterating and direct current signal sending and receiving devices to complete the transmission of the first AC signal, and, described the second alterating and direct current signal sending and receiving devices generate the second AC signal by AC signal transmission circuit independently by described the second AC signal with isolation method transmission and be converted to the feedback signal that is superimposed on described standard direct current signal to complete the transmission of the second AC signal to the first alterating and direct current signal sending and receiving devices, thereby realize the two-way isolation transmission of AC signal, anti-interference and the reliability of AC signal transmission are strengthened.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, such as bend to have in technical field and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (6)
1. an isolation alternating current-direct current signal bidirectional transmission circuit, is characterized in that, electricity isolation transmission AC signal between the first alterating and direct current signal sending and receiving devices and the second alterating and direct current signal sending and receiving devices; Wherein, described the first alterating and direct current signal sending and receiving devices, output the first standard direct current signal or be superimposed upon the first AC signal of described the first standard direct current signal, described isolation alternating current-direct current signal bidirectional transmission circuit comprises:
Direct current becomes alternating current circuit, comprising: primary circuit, for receiving the output of described the first alterating and direct current signal sending and receiving devices and being converted to AC signal output; Secondary circuit is for receiving to isolate the described AC signal that transmission means is sent, and described AC signal is converted to the second standard DC signal output of corresponding the first standard direct current signal, or be converted to the signal output of described the first AC signal of correspondence that is superimposed upon described the second standard direct current signal;
Curtage change-over circuit, receives the output of described secondary circuit, and is converted to corresponding voltage or current signal to the second alterating and direct current signal sending and receiving devices, to complete the transmission of the first AC signal to the second alterating and direct current signal sending and receiving devices;
Be located at described the second alterating and direct current signal sending and receiving devices, generate the second AC signal;
AC signal transmission circuit, connects described AC signal generator and described the first alterating and direct current signal sending and receiving devices; Described AC signal transmission circuit comprises isolation transmitter part, for by described the second AC signal with isolation method transmission and be converted to the voltage or the current signal that are superimposed on described standard direct current signal, to complete the transmission of the second AC signal to the first alterating and direct current signal sending and receiving devices.
2. isolation alternating current-direct current signal bidirectional transmission circuit according to claim 1, it is characterized in that, it is magnetic isolation transmitter part that described direct current becomes alternating current circuit, described primary circuit comprises that the first electric current flows into end and outflow end, described secondary circuit comprises that the second electric current flows into end and outflow end, and described curtage change-over circuit comprises: the first amplifier, the first triode; The second electric current that the reverse phase input of described the first amplifier is connected in described secondary circuit flows into end, the in-phase input end of described the first amplifier is connected in the second outflow of bus current end of described secondary circuit, and described the second outflow of bus current end is connected to described the second alterating and direct current signal sending and receiving devices; The output of described the first amplifier connects the ground level of described the first triode, and described the first triode is NPN type, and the collector electrode of described the first triode has reference voltage, and the emitter of described the first triode connects the inverting input of described the first amplifier.
3. isolation alternating current-direct current signal bidirectional transmission circuit according to claim 1, it is characterized in that, the AC signal that described the first alterating and direct current signal sending and receiving devices produces comes from the input equipment in the first alterating and direct current signal sending and receiving devices, described isolation transmitter part comprises the U/I change-over circuit, the isolation transmitter part with primary circuit and secondary circuit and the 2nd U/I change-over circuit that connect successively, and described isolation transmitter part is Light Coupled Device.
4. isolation alternating current-direct current signal bidirectional transmission circuit according to claim 3, is characterized in that, a described U/I change-over circuit comprises: the second amplifier; Described AC signal generator is connected to the in-phase input end of described the second amplifier through capacitor-coupled, the inverting input of described the second amplifier is through the second grounding through resistance, and the output of described the second amplifier is connected to the inverting input of described the second amplifier through the inlet circuit of described isolation transmitter part and the first resistance; The first electric current that the circuit of output terminal of described isolation transmitter part is connected to the primary circuit of described direct current change alternating current circuit by described the 2nd U/I change-over circuit flows into end.
5. according to the isolation alternating current-direct current signal bidirectional transmission circuit described in claim 3 or 4, it is characterized in that, described the 2nd U/I change-over circuit comprises: the 3rd amplifier and the second triode, the inverting input of described the 3rd amplifier connects described isolation transmitter part through the 3rd resistance, the first electric current that the in-phase input end of described the 3rd amplifier is connected to the primary circuit of described direct current change alternating current circuit flows into end, the output of described the 3rd amplifier connects the base stage of described the second triode, described the second triode is positive-negative-positive, the grounded collector of described the second triode and emitter connect the first outflow of bus current end of the primary circuit of described direct current change alternating current circuit.
6. isolation alternating current-direct current signal bidirectional transmission circuit according to claim 1, is characterized in that, described the second AC signal is to be produced by the AC signal generator that is parallel to load resistance two ends in the second alterating and direct current signal sending and receiving devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420079977.2U CN203747655U (en) | 2014-02-25 | 2014-02-25 | Isolated AC-DC signal two-way transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420079977.2U CN203747655U (en) | 2014-02-25 | 2014-02-25 | Isolated AC-DC signal two-way transmission circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747655U true CN203747655U (en) | 2014-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420079977.2U Withdrawn - After Issue CN203747655U (en) | 2014-02-25 | 2014-02-25 | Isolated AC-DC signal two-way transmission circuit |
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| CN (1) | CN203747655U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868732A (en) * | 2014-02-25 | 2015-08-26 | 上海辰竹仪表有限公司 | Isolated AC-DC signal two-way transmission circuit |
-
2014
- 2014-02-25 CN CN201420079977.2U patent/CN203747655U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868732A (en) * | 2014-02-25 | 2015-08-26 | 上海辰竹仪表有限公司 | Isolated AC-DC signal two-way transmission circuit |
| CN104868732B (en) * | 2014-02-25 | 2017-08-25 | 上海辰竹仪表有限公司 | One kind isolation alternating current-direct current signal bidirectional transmission circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20170825 |
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| AV01 | Patent right actively abandoned |