CN101924459A - Switching signal interface circuit based on double photoelectric isolation - Google Patents
Switching signal interface circuit based on double photoelectric isolation Download PDFInfo
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- CN101924459A CN101924459A CN 201010219499 CN201010219499A CN101924459A CN 101924459 A CN101924459 A CN 101924459A CN 201010219499 CN201010219499 CN 201010219499 CN 201010219499 A CN201010219499 A CN 201010219499A CN 101924459 A CN101924459 A CN 101924459A
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Abstract
The invention relates to the technique of switching signal transmission in power electronic converters, aiming at providing a switching signal interface circuit based on double photoelectric isolation. The interface circuit comprises two photoelectric isolating circuits and an intermediate circuit; the first photoelectric isolating circuit receives a primary side switching signal and outputs a first intermediate switching signal according to the primary side switching signal; the intermediate circuit receives the first intermediate switching signal and outputs a second intermediate switching signal according to the first intermediate switching signal; and the second photoelectric isolating circuit receives the second intermediate switching signal and outputs a secondary side switching signal according to the second intermediate switching signal. The invention is applicable for the signal transmission of the switching signal with reliable electric isolation and interference shielding in the power electronic converters of relatively higher voltage class or relatively higher power class. The relatively long-distance isolation transmission can be achieved by the intermediate circuit, the influence of potential variation between high-voltage and low-voltage circuits on signal transmission is obviously inhibited as the potential of the intermediate circuit is relatively fixed; and one side of a sensitive control circuit can be far from high voltage.
Description
Technical field
The present invention relates to switching signal transmission technology in the converters, particularly a kind of switching signal interface circuit of isolating based on two photoelectricity.
Background technology
In recent years, the application of converters is increasingly extensive.Converters is realized Power Conversion by the turn-on and turn-off of semiconductor device in the light current switching signal power controlling circuit, and the status switch signal feedback in the power circuit is to control circuit simultaneously.So-called switching signal is a kind of signal type that is different from analog signal, can represent with two states of circuit, as logical and disconnected two states, two states of high level and low level.In Power Electronic Circuit, switching signal is commonly used for the drive controlling and the circuit state message feedback of switches such as power semiconductor.Control circuit and power circuit often are not in same with reference on the ground, so the transmission of switching signal need be carried out electrical isolation.
The method that is usually used in the switching signal isolation at present mainly contains light-coupled isolation and optical fiber isolation.Wherein optical fiber is isolated the converters that is mainly used in high-power, and thoroughly in the shutoff signal transmission course, power circuit is to the interference of control circuit, but the cost that optical fiber is isolated is higher.Traditional light-coupled isolation method can not realize remote isolation, and control circuit and power circuit must be close mutually.Because in power circuit, power semiconductor voltage, electric current in switching process change rapidly, produce very strong electromagnetic interference, may near weak control circuit be made a big impact.This is embodied in the following aspects: (1) in high-power power electronic converter, control circuit and power circuit require that distance enough far away is arranged, but adopt traditional light-coupled isolation method, still separation control circuit and power circuit at a distance; (2) still have direct capacitive coupling between the former secondary both sides of photoelectric coupled circuit, can not the isolated power circuit to the influence of control circuit, the interference signal in the power circuit can be transmitted in the control circuit by the coupling capacitance between the former secondary of photoelectric coupled circuit; (3) on high-tension side sensor circuit can be guided to the high-tension circuit interference signal lower-voltage circuit (in like manner, the circuit of low-pressure side also might disturb on high-tension side sensor circuit).
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, and a kind of switching signal interface circuit of isolating based on two photoelectricity is provided.
Be the technical solution problem, the concrete technical scheme that the present invention adopts is:
Based on the switching signal interface circuit that two photoelectricity are isolated, comprise primary side switching signal positive and negative terminal that is positioned at input and the secondary side switches signal positive and negative terminal that is positioned at output; Also comprise first photoelectric isolating circuit, second photoelectric isolating circuit and be used for the output circuit of first photoelectric isolating circuit and the adaptive intermediate circuit of input circuit of second photoelectric isolating circuit; Described intermediate circuit and intermediate circuit power supply join, and comprise the positive and negative terminal of the interconnective first intermediate switch signal and the positive and negative terminal of the second intermediate switch signal; The transmitting terminal circuit of the described primary side switching signal positive and negative terminal and first photoelectric isolating circuit joins, and the receiving terminal circuit of first photoelectric isolating circuit and the positive and negative terminal of the first intermediate switch signal join; The receiving terminal circuit of the described secondary side switches signal positive and negative terminal and second photoelectric isolating circuit joins, and the transmitting terminal circuit of second photoelectric isolating circuit and the positive and negative terminal of the second intermediate switch signal join; This switching signal interface circuit also comprises the reference ground of primary side switching signal, the reference ground of secondary side switches signal and the reference ground of intermediate circuit.
First photoelectric isolating circuit is accepted the primary side switching signal, and exports the first intermediate switch signal in view of the above; Intermediate circuit is accepted the first intermediate switch signal, and exports the second intermediate switch signal in view of the above; Second photoelectric isolating circuit is accepted the second intermediate switch signal, and exports the secondary side switches signal in view of the above.
As a kind of improvement, described first photoelectric isolating circuit comprises first optocoupler and current-limiting resistance one; Primary side switching signal anode is connected to the light-emitting diodes tube anode of first optocoupler by current-limiting resistance one, and primary side switching signal negative terminal (Ea2) is connected to the light-emitting diodes tube cathode of first optocoupler; The collector electrode of first optocoupler connects the anode of the first intermediate switch signal, and the emitter of first optocoupler connects the negative terminal of the first intermediate switch signal.
As a kind of improvement, described second photoelectric isolating circuit comprises second optocoupler and current-limiting resistance two, the second intermediate switch signal anode is connected to the light-emitting diodes tube anode of second optocoupler by current-limiting resistance two, the negative terminal of the second intermediate switch signal connects the light-emitting diodes tube cathode of second optocoupler, the collector electrode of second optocoupler connects the anode of secondary side switches signal, and the emitter of second optocoupler connects the negative terminal of secondary side switches signal.
As a kind of improvement, described intermediate circuit has the circuit structure of transmission in parallel: the first intermediate switch signal anode connects the second intermediate switch signal anode, and be connected with the power end of intermediate circuit accessory power supply by current-limiting resistance three, the first intermediate switch signal negative terminal connects the second intermediate switch signal negative terminal, and is connected with the ground end of intermediate circuit accessory power supply.
As a kind of improvement, described intermediate circuit has the circuit structure of series connection transmission: the first intermediate switch signal anode is connected with the second intermediate switch signal negative terminal, the first intermediate switch signal negative terminal is connected with the ground end of intermediate circuit accessory power supply, and the second intermediate switch signal anode is connected with the power end of intermediate circuit accessory power supply by current-limiting resistance three.
As a kind of improvement, the reference ground and the intermediate circuit of the reference of described primary side switching signal ground, secondary side switches signal are not electrically connected each other with reference to ground.
As a kind of improvement, reference of the reference of described intermediate circuit ground and primary side switching signal, be electrically connected between one of them to the reference of secondary side switches signal.
As a kind of improvement, described first photoelectric isolating circuit and second photoelectric isolating circuit are conventional photoelectric coupled devices, or comprise integrated electro isolating chip and the peripheral circuit thereof of being with logical circuit.
Among the present invention, described primary side is meant the primary side end mouth (or signal input part) of whole signal interface circuit, and described secondary side is meant the secondary port (or signal output part) of whole signal interface circuit, does not refer in particular to high pressure or low-pressure side.
Be meant to the reference of primary side switching signal the reference ground of signal input side circuit (the primary side circuit that promptly is attached thereto), be meant to the reference of secondary side switches signal the reference ground of signal outlet side circuit (the secondary side circuit that promptly is attached thereto).First photoelectric isolating circuit is accepted the primary side switching signal, and exports the first intermediate switch signal in view of the above; Intermediate circuit is accepted the first intermediate switch signal, and exports the second intermediate switch signal in view of the above; Second photoelectric isolating circuit is accepted the second intermediate switch signal, and exports the secondary side switches signal in view of the above.
Photoelectric isolating circuit (or device) comprises transmitting terminal circuit and receiving terminal circuit, is used for the transmitting switch signal in the present invention, transmits signal and keeps transmitting terminal circuit and receiving terminal circuit to possess the electrical isolation performance by light.Photoelectric isolating circuit among the present invention can be conventional photoelectric coupled device, also can be to comprise integrated electro isolating chip and the peripheral circuit thereof of being with logical circuit.
So-called intermediate circuit, being meant can be with the first photoelectric isolating circuit output circuit and the adaptive circuit of the second photoelectric isolating circuit input circuit, makes the signal can be from the first photoelectric isolating circuit input to the transmission of second photoelectric isolating circuit output.The implementation of intermediate circuit has a lot, for example can be as the simple circuit in accompanying drawing 3 and 4, also can adopt the integrated circuit of band signal processing capacity.
Switching signal interface circuit of isolating of the present invention based on two photoelectricity, sometimes for simplifying circuit, reference of circuit ground can have and be electrically connected (usually to avoid the ground of a disturbed side to be connected to hope, with more effectively shielding interference) with reference to ground, secondary side switches signal with reference to the wherein ground of a side on ground with the primary side switching signal in the middle of it.
Beneficial effect of the present invention is:
The present invention is applicable to the signal transmission with reliable electric isolation, interference shielding of switching signal (for example logic control signal, switching drive signal, state detection signal etc.) in the converters of high voltage grade or more high-power grade.The primary side switching signal can be isolated being transferred to secondary side, and can shield the mutual interference mutually between primary side and the secondary side better.The introducing of intermediate circuit is because its current potential relative fixed (often being connected to by a side of buffer circuit) makes the potential change between the high and low pressure circuit be inhibited significantly to the influence that signal transmits; And sensitive control circuit also is able to the interference signal away from opposite side high pressure (or high potential difference).
Description of drawings
The switching signal interface circuit that the single photoelectricity of Fig. 1 available technology adopting is isolated;
Fig. 2 is a switching signal interface circuit block diagram of isolating based on two photoelectricity of the present invention;
Fig. 3 is a kind of switching signal interface circuit of isolating based on two photoelectricity of the invention process;
Fig. 4 is the switching signal interface circuit that another kind of the invention process is isolated based on two photoelectricity;
Fig. 5 is the optocoupler that photoelectric isolating circuit adopts integrated logic circuit among the present invention.
Accompanying drawing 2-5 neutron block diagram is explained: 110 first photoelectric isolating circuits; 120: the second photoelectric isolating circuits; 130: intermediate circuit.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is explained.
A kind of preferable embodiment of the present invention as shown in Figure 3, comprise first photoelectric isolating circuit 110, intermediate circuit 130 and second photoelectric isolating circuit 120, the reference ground Ga of primary side switching signal, the reference ground Gb of secondary side switches signal, intermediate circuit is with reference to ground Gc and intermediate circuit power supply Vc; The reference ground Ga of three partial circuits, Gb, usually be not electrically connected between the Gc, but sometimes for simplifying circuit, reference of circuit ground can have and be electrically connected (usually to avoid the ground of a disturbed side to be connected to hope, with more effectively shielding interference) with reference to ground, secondary side switches signal with reference to the wherein ground of a side on ground with the primary side switching signal in the middle of it; First photoelectric isolating circuit 110 comprises the first optocoupler U1 and current-limiting resistance one R1, primary side switching signal anode Ea1 is connected to the light-emitting diodes tube anode of the first optocoupler U1 by current-limiting resistance one R1, primary side switching signal negative terminal Ea2 is connected to the light-emitting diodes tube cathode of first optocoupler, the collector electrode of first optocoupler connects the anode Aa1 of the first intermediate switch signal, and the emitter of first optocoupler connects the negative terminal Aa2 of the first intermediate switch signal; Second photoelectric isolating circuit comprises the second optocoupler U2 and current-limiting resistance two R2, the second intermediate switch signal anode Eb1 is connected to the light-emitting diodes tube anode of the second optocoupler U2 by current-limiting resistance two R2, the second intermediate switch signal negative terminal Eb2 connects the light-emitting diodes tube cathode of the second optocoupler U2, the collector electrode of the second optocoupler U2 connects the anode Ab1 of secondary side switches signal, and the emitter of the second optocoupler U2 connects the negative terminal Ab2 of secondary side switches signal.
Among this embodiment, intermediate circuit 130 adopts the execution mode of transmission in parallel: the first intermediate switch signal anode Aa1 connects the second intermediate switch signal anode Eb1, and be connected with the power end Vc of intermediate circuit accessory power supply by current-limiting resistance three R3, the first intermediate switch signal negative terminal Aa2 connects the second intermediate switch signal negative terminal Eb2, and is connected with the reference ground Gc of intermediate circuit.
Adopt such scheme, as primary side switching signal Ea1, when Ea2 is high level, the light-emitting diode conducting of the first optocoupler U1, the first intermediate switch signal and the second intermediate switch signal are low level, the light-emitting diode of the second optocoupler U2 turn-offs, and secondary side switches signal ends A b1, Ab2 are for disconnecting at this moment; When switching signal Ea1, an Ea2 are low level, the light-emitting diode of the first optocoupler U1 turn-offs, the first intermediate switch signal and the second intermediate switch signal are high level, and the light-emitting diode of the second optocoupler U2 is open-minded, and secondary side switches signal ends A b1, Ab2 are short circuit at this moment.
Second kind of embodiment is referring to Fig. 4, in this scheme, intermediate circuit 130 adopts the execution mode of series connection transmission: the first intermediate switch signal anode Aa1 is connected with the second intermediate switch signal negative terminal Eb2, the first intermediate switch signal negative terminal Aa2 is connected with the ground end Gc of intermediate circuit accessory power supply, and the second intermediate switch signal anode Eb1 is connected with the power end Vc of intermediate circuit accessory power supply by current-limiting resistance three R3.
Adopt such scheme, as primary side switching signal Ea1, when Ea2 is high level, the light-emitting diode conducting of the first optocoupler U1, the first intermediate switch signal ends A a1, Aa2 short circuit, the second intermediate switch signal is a high level, the light-emitting diode of the second optocoupler U2 is open-minded, and secondary side switches signal ends A b1, Ab2 are short circuit at this moment; When switching signal Ea1, an Ea2 are low level, the light-emitting diode of the first optocoupler U1 turn-offs, the first intermediate switch signal ends A a1, Aa2 open circuit, the second intermediate switch signal Eb1, Eb2 are low level, the light-emitting diode of the second optocoupler U2 turn-offs, and secondary side switches signal ends A b1, Ab2 are for opening circuit at this moment.
The third embodiment is referring to Fig. 5, in this scheme, first photoelectric isolating circuit 110, second photoelectric isolating circuit 120, and the circuit structure form of intermediate circuit 130 is identical with second kind of embodiment, difference is, has adopted the optocoupler of the integrated circuit of band signal processing capacity in first photoelectric isolating circuit 110, second photoelectric isolating circuit 120.
The above, it only is several preferable case study on implementation of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferable case study on implementation, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the structure that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent case study on implementation of equivalent variations, but every content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above case study on implementation, equivalent variations and modification all still belong in the technical solution of the present invention scope.
Claims (8)
1. a switching signal interface circuit of isolating based on two photoelectricity comprises primary side switching signal positive and negative terminal that is positioned at input and the secondary side switches signal positive and negative terminal that is positioned at output; It is characterized in that, also comprise first photoelectric isolating circuit (110), second photoelectric isolating circuit (120) and be used for the output circuit of first photoelectric isolating circuit (110) and the adaptive intermediate circuit (130) of input circuit of second photoelectric isolating circuit (120); Described intermediate circuit (130) joins with intermediate circuit power supply (Vc), comprises the positive and negative terminal of the interconnective first intermediate switch signal and the positive and negative terminal of the second intermediate switch signal; The transmitting terminal circuit of described primary side switching signal positive and negative terminal and first photoelectric isolating circuit (110) joins, and the receiving terminal circuit of first photoelectric isolating circuit (110) and the positive and negative terminal of the first intermediate switch signal join; The receiving terminal circuit of described secondary side switches signal positive and negative terminal and second photoelectric isolating circuit (120) joins, and the transmitting terminal circuit of second photoelectric isolating circuit (120) and the positive and negative terminal of the second intermediate switch signal join; This switching signal interface circuit also comprises the reference ground (Ga) of primary side switching signal, the reference ground (Gb) of secondary side switches signal and the reference ground (Gc) of intermediate circuit.
2. switching signal interface circuit according to claim 1 is characterized in that, described first photoelectric isolating circuit (110) comprises first optocoupler (U1) and current-limiting resistance one (R1); Primary side switching signal anode (Ea1) is connected to the light-emitting diodes tube anode of first optocoupler (U1) by current-limiting resistance one (R1), and primary side switching signal negative terminal (Ea2) is connected to the light-emitting diodes tube cathode of first optocoupler; The collector electrode of first optocoupler connects the anode (Aa1) of the first intermediate switch signal, and the emitter of first optocoupler connects the negative terminal (Aa2) of the first intermediate switch signal.
3. switching signal interface circuit according to claim 1, it is characterized in that, described second photoelectric isolating circuit comprises second optocoupler (U2) and current-limiting resistance two (R2), the second intermediate switch signal anode (Eb1) is connected to the light-emitting diodes tube anode of second optocoupler (U2) by current-limiting resistance two (R2), the negative terminal of the second intermediate switch signal (Eb2) connects the light-emitting diodes tube cathode of second optocoupler (U2), the collector electrode of second optocoupler (U2) connects the anode (Ab1) of secondary side switches signal, and the emitter of second optocoupler (U2) connects the negative terminal (Ab2) of secondary side switches signal.
4. switching signal interface circuit according to claim 1, it is characterized in that, described intermediate circuit has the circuit structure of transmission in parallel: the first intermediate switch signal anode (Aa1) connects the second intermediate switch signal anode (Eb1), and be connected with the power end (Vc) of intermediate circuit accessory power supply by current-limiting resistance three (R3), the first intermediate switch signal negative terminal (Aa2) connects the second intermediate switch signal negative terminal (Eb2), and is connected with the ground end (Gc) of intermediate circuit accessory power supply.
5. switching signal interface circuit according to claim 1, it is characterized in that, described intermediate circuit has the circuit structure of series connection transmission: the first intermediate switch signal anode (Aa1) is connected with the second intermediate switch signal negative terminal (Eb2), the first intermediate switch signal negative terminal (Aa2) is connected with the ground end (Gc) of intermediate circuit accessory power supply, and the second intermediate switch signal anode (Eb1) is connected with the power end (Vc) of intermediate circuit accessory power supply by current-limiting resistance three (R3).
6. according to the switching signal interface circuit described in any one of the claim 1 to 5, it is characterized in that the reference ground (Ga) of described primary side switching signal, the reference ground (Gb) and the intermediate circuit of secondary side switches signal are not electrically connected each other with reference to ground (Gc).
7. according to the switching signal interface circuit described in any one of the claim 1 to 5, it is characterized in that, reference of the reference of described intermediate circuit ground (Gc) and primary side switching signal (Ga), secondary side switches signal reference (Gb) be electrically connected between one of them.
8. according to the switching signal interface circuit described in any one of the claim 1 to 5, it is characterized in that, described first photoelectric isolating circuit (110) and second photoelectric isolating circuit (120) are conventional photoelectric coupled devices, or comprise integrated electro isolating chip and the peripheral circuit thereof of being with logical circuit.
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| CN2010102194997A CN101924459B (en) | 2010-07-06 | 2010-07-06 | Switching signal interface circuit based on double photoelectric isolation |
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| CN2010102194997A CN101924459B (en) | 2010-07-06 | 2010-07-06 | Switching signal interface circuit based on double photoelectric isolation |
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| CN101924459B CN101924459B (en) | 2012-09-19 |
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| CN102104319A (en) * | 2011-04-01 | 2011-06-22 | 欧瑞传动电气有限公司 | IGBT drive circuit and control method |
| CN105162318A (en) * | 2015-08-25 | 2015-12-16 | 山东超越数控电子有限公司 | Method for improving video graphics array (VGA) signal display quality |
| CN106817212A (en) * | 2016-12-15 | 2017-06-09 | 国网安徽省电力公司淮北供电公司 | A kind of device of short-distance and medium-distance high withstand voltage isolation communication |
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
| CN112740525A (en) * | 2018-09-28 | 2021-04-30 | 法雷奥西门子新能源汽车(德国)有限公司 | Power converter, vehicle and method for operating a power converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102104319A (en) * | 2011-04-01 | 2011-06-22 | 欧瑞传动电气有限公司 | IGBT drive circuit and control method |
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| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
| CN112740525A (en) * | 2018-09-28 | 2021-04-30 | 法雷奥西门子新能源汽车(德国)有限公司 | Power converter, vehicle and method for operating a power converter |
| CN112740525B (en) * | 2018-09-28 | 2024-04-19 | 法雷奥西门子新能源汽车(德国)有限公司 | Power converter, vehicle and method for operating a power converter |
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