CN214045594U - Bidirectional isolation drive circuit and power tube drive system - Google Patents
Bidirectional isolation drive circuit and power tube drive system Download PDFInfo
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- CN214045594U CN214045594U CN202023054592.5U CN202023054592U CN214045594U CN 214045594 U CN214045594 U CN 214045594U CN 202023054592 U CN202023054592 U CN 202023054592U CN 214045594 U CN214045594 U CN 214045594U
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Abstract
The utility model provides a two-way isolation drive circuit and power tube actuating system, keep apart drive circuit including the first modem circuit, first switch circuit, buffer circuit, second switch circuit and the second modem circuit that connect gradually, and with the feedback circuit of first switch circuit and second switch circuit connection. The utility model discloses a feedback circuit receives feedback signal and controls first switch circuit and second switch circuit's on-state makes first modem circuit and second modem circuit switch mode, carry out the switching of modulation and demodulation, make two-way isolation drive circuit's only need a set of buffer circuit can realize the two-way transmission function.
Description
Technical Field
The utility model relates to an keep apart the drive field, in particular to two-way isolation drive circuit and power tube actuating system.
Background
The driving technology of power devices such as IGBT, SiC, GaN and the like is the key of the application of the power semiconductor device, and plays a decisive role in the reliability, efficiency and cost of the power semiconductor device. In many applications, considering the electrical safety problem, an isolation driving circuit is needed, and the isolation driving circuit is divided into three parts, namely a transmitting end, a receiving end and an isolation device. At the transmitting end, the input signal (driving or control signal, etc.) is modulated, amplified, etc. After passing through the isolation device, the isolation signal needs to be received, recovered, amplified and the like at the receiving end.
In the prior art, most of input signal isolation transmission circuits adopt a unidirectional transmission mode, that is, an input signal can only be transmitted from an input end to a receiving end but cannot be reversely transmitted from an output end to the input end, two groups of isolation devices (such as a transformer, an optical coupler and the like) are generally needed to realize bidirectional transmission, so that the circuit structure is overstaffed and the power consumption is increased.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a bidirectional isolation driving circuit and power tube driving system, which solves the technical problem of two sets of isolation devices required for bidirectional transmission.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a bidirectional isolation driving circuit, which comprises a first modulation and demodulation circuit, a first switch circuit, an isolation circuit, a second switch circuit and a second modulation and demodulation circuit which are connected in sequence, and a feedback circuit connected with the first switch circuit and the second switch circuit; receiving a feedback signal by the feedback circuit, and outputting a switching signal according to the feedback signal to control the conduction state of the first switch circuit and the second switch circuit; switching to a modulation mode by the first modulation and demodulation circuit according to the conduction state of the first switch circuit to modulate an input signal, or switching to a demodulation mode to demodulate a modulated signal; switching to a demodulation mode by the second modulation and demodulation circuit according to the conducting state of the second switch to demodulate the modulation signal, or switching to a modulation mode to modulate the input signal; and carrying out isolated transmission by the isolation circuit according to the mode of the first modulation and demodulation circuit and the second modulation and demodulation circuit.
The first detection circuit includes: the first detection unit is used for converting the feedback signal into a first switching signal and outputting the feedback signal and the first switching signal; an isolation capacitor for isolating transmission of the first switching signal; the feedback unit is used for converting the first switching signal into a second switching signal and outputting the first switching signal and the second switching signal; the first detection unit, the isolation capacitor and the feedback unit are sequentially connected, the feedback unit is further connected with the first switch circuit, and the first detection unit is further connected with the second switch circuit.
The first modulation and demodulation circuit includes: the first modulation circuit is connected with the first switch circuit and is used for modulating a first input signal; and the first demodulation circuit is connected with the first switch circuit and is used for demodulating the second modulation signal transmitted by the isolation circuit.
The first switching circuit comprises a first switch and a second switch; receiving a first switching signal by the first switch and switching on or off a loop between the first modulation circuit and the isolation circuit; and receiving a second switching signal by the second switch to cut off or conduct a loop between the first demodulation circuit and the isolation circuit.
The second modulation and demodulation circuit includes: the second modulation circuit is connected with the second switch circuit and is used for modulating a second input signal; and the second demodulation circuit is connected with the second switch circuit and is used for demodulating the first modulation signal transmitted by the isolation circuit.
The second switching circuit comprises a third switch and a fourth switch; receiving, by the third switch, the feedback signal and turning on or off a loop between a second modulation circuit and an isolation circuit; and the fourth switch receives the first switching signal to conduct a loop between the second demodulation circuit and the isolation circuit.
The first detection unit comprises a first phase inverter, the input end of the first phase inverter is connected with a feedback signal and is connected with the control end of the fourth switch, and the output end of the first phase inverter is connected with the control end of the third switch and one end of the isolation capacitor.
The feedback unit comprises a second phase inverter, the input end of the second phase inverter is connected with the other end of the isolation capacitor and the control end of the second switch, and the output end of the second phase inverter is connected with the control end of the first switch.
The isolation circuit comprises a first capacitor, one end of the first capacitor is connected with the first switch circuit, and the other end of the first capacitor is connected with the second switch circuit; or the isolation circuit comprises a differential transmission unit which is connected with the first switch unit and is used for carrying out differential transmission on the modulation signal.
A power tube driving system comprises a power tube and the bidirectional isolation driving circuit, wherein the bidirectional isolation driving circuit is connected with a control end of the power tube.
Compared with the prior art, the utility model provides a two-way isolation drive circuit and power tube actuating system, it includes the first modem circuit, first switch circuit, buffer circuit, second switch circuit and the second modem circuit that connect gradually to keep apart drive circuit. The utility model discloses a feedback circuit receives feedback signal and controls first switch circuit and second switch circuit's on-state makes first modem circuit and second modem circuit switch mode, carry out the switching of modulation and demodulation, make two-way isolation drive circuit's only need a set of buffer circuit can realize the two-way transmission function.
Drawings
Fig. 1 is a block diagram of a structural frame of a bidirectional isolation driving circuit provided by the present invention;
fig. 2 is a specific structure block diagram of the bidirectional isolation driving circuit provided by the present invention.
Detailed Description
The utility model provides a two-way isolation drive circuit and power tube actuating system has solved the technical problem that realizes that two-way transmission needs two sets of isolation devices.
The present invention is described in more detail in order to facilitate the explanation of the technical idea, the technical problem solved, the technical features of the technical solution, and the technical effects brought by the present invention. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
In the prior art, most of input signal isolation transmission circuits adopt a one-way transmission mode, that is, input signals can only be transmitted from an input end to a receiving end but cannot be reversely transmitted from an output end to the input end, two sets of isolation devices are generally needed to realize two-way transmission, which results in a bloated circuit structure and increased power consumption.
In view of the above problems in the prior art, please refer to fig. 1, the present invention provides a bidirectional isolation driving circuit, which includes a first modulation and demodulation circuit 100, a first switch 301 circuit 300, an isolation circuit 400, a second switch 302 circuit 500, and a second modulation and demodulation circuit 600, which are connected in sequence, and a feedback circuit 200 connected to the first switch 301 circuit 300 and the second switch 302 circuit 500; receiving a feedback signal by the feedback circuit 200, and outputting a switching signal according to the feedback signal to control the conducting state of the first switch 301 circuit 300 and the second switch 302 circuit 500; switching to a modulation mode by the first modulation and demodulation circuit 100 according to the on state of the first switch 301 circuit 300 to modulate an input signal or switching to a demodulation mode to demodulate a modulated signal; the second modulation and demodulation circuit 600 switches to a demodulation mode to demodulate the modulated signal or switches to a modulation mode to modulate the input signal according to the conducting state of the second switch 302; the isolated transmission is performed by the isolation circuit 400 according to the mode of the first modulation and demodulation circuit 100 and the second modulation and demodulation circuit 600.
In this embodiment, the feedback circuit 200 receives a feedback signal to control the conducting states of the first switch 301 circuit 300 and the second switch 302 circuit 500, so that the first modulation and demodulation circuit 100 and the second modulation and demodulation circuit 600 switch modes to perform modulation and demodulation switching, and the bidirectional isolation driving circuit only needs one set of isolation circuit 400 to realize a bidirectional transmission function.
Specifically, the first detection circuit includes: a first detecting unit 210 for converting the feedback signal into a first switching signal and outputting the feedback signal and the first switching signal; an isolation capacitor C2 for isolating transmission of the first switching signal; a feedback unit 220 for converting the first switching signal into a second switching signal and outputting the first switching signal and the second switching signal; the first detection unit 210, the isolation capacitor C2 and the feedback unit 220 are sequentially connected, the feedback unit 220 is further connected with the first switch 301 circuit 300, and the first detection unit 210 is further connected with the second switch 302 circuit 500.
In this embodiment, the feedback signal is provided by a related device that provides the input signal or receives the restored input signal. The first detecting unit 210 receives a feedback signal, converts the feedback signal to the second switch 302 circuit 500, and simultaneously converts the feedback signal to a first switching signal to be transmitted to the second switch 302 circuit 500, so as to control the corresponding on or off state of the second switch 302 circuit 500. The isolation capacitor C2 transmits the first switching signal to the feedback unit 220, and the feedback unit 220 transmits the first switching signal to the first switch 301 circuit 300 and simultaneously converts the first switching signal into a second switching signal to the first switch 301 circuit 300, so as to control the first switch 301 circuit 300 to be in a corresponding on or off state.
Specifically, referring to fig. 2, the first modulation and demodulation circuit 100 includes: a first modulation circuit 101 connected to the first switch 301 circuit 300 for modulating a first input signal; and a first demodulation circuit 102 connected to the first switch 301 circuit 300 for demodulating the second modulation signal transmitted from the isolation circuit 400.
In specific implementation, in this embodiment, the first modulation circuit 101 is configured to modulate a first input signal and output a first modulation signal; the first demodulation circuit 102 is only used for demodulating the second modulation signal transmitted from the isolation circuit 400 and outputting a restored second input signal. When the loop of the first modulation circuit 101 and the isolation circuit 400 is turned on, the first modulation circuit 101 modulates the first input signal, and outputs a modulated signal to the isolation circuit 400, and the modulated signal is output to a subsequent circuit by the isolation circuit 400. When the loop between the first demodulation circuit 102 and the isolation circuit 400 is conducted, the first demodulation circuit 102 demodulates the second modulation signal transmitted from the isolation circuit 400, and outputs the restored second input signal to control the external power tube.
Further, with continued reference to fig. 2, the second modulation and demodulation circuit 600 includes: a second modulation circuit 602 connected to the second switch 302 circuit 500 for modulating a second input signal; and a second demodulation circuit 601 connected to the second switch 302 circuit 500 for demodulating the first modulation signal transmitted from the isolation circuit 400.
The second modulation circuit 602 is configured to modulate an input signal and output a second modulation signal; the second demodulation circuit 601 is only used for demodulating the first modulation signal and outputting the restored first input signal. When the loop of the second modulation circuit 602 and the isolation circuit 400 is turned on, the second modulation circuit 602 modulates the second input signal, and outputs the second modulated signal to the isolation circuit 400, and the second modulated signal is output to the post-stage circuit (here, the first demodulation circuit 102) by the isolation circuit 400. When the loop between the second demodulation circuit 601 and the isolation circuit 400 is turned on, the second demodulation circuit 601 demodulates the first modulation signal transmitted from the isolation circuit 400 and outputs the restored first input signal to control the external power transistor.
Specifically, with continued reference to fig. 2, the first switch 301 circuit 300 includes a first switch 301 and a second switch 302; receiving a first switching signal by the first switch 301 and turning on or off a loop between the first modulation circuit 101 and the isolation circuit 400; receiving the second switching signal by the second switch 302 cuts off or turns on the loop between the first demodulation circuit 102 and the isolation circuit 400.
In specific implementation, in this embodiment, when the first switch 301 receives the first switching signal, if the first switching signal is at a high level, the first switch 301 is turned on, and if the first switching signal is at a low level, the first switch 301 is turned off; when the second switch 302 receives the second switching signal, if the second switching signal is at a high level, the second switch 302 is turned on, and if the second switching signal is at a low level, the second switch 302 is turned off. It should be noted that the first switch 301 and the second switch 302 may also be turned on by low level control, and turned off by high level control, and may be freely selected according to the type of the switch, which is only an example and is not limited herein.
Specifically, with continued reference to fig. 2, the second switch 302 circuit 500 includes a third switch 501 and a fourth switch 502; receiving the feedback signal by the third switch 501 and turning on or off the loop between the second modulation circuit 602 and the isolation circuit 400; the receiving of the first switching signal by the fourth switch 502 turns on the loop between the second demodulation circuit 601 and the isolation circuit 400.
In specific implementation, in this embodiment, when the third switch 501 receives a feedback signal, if the feedback signal is at a high level, the third switch 501 is turned on, and if the feedback signal is at a low level, the third switch 501 is turned off; when the fourth switch 502 receives the first switching signal, if the first switching signal is at a high level, the fourth switch 502 is turned on, and if the first switching signal is at a low level, the fourth switch 502 is turned off. It should be noted that, the third switch 501 and the fourth switch 502 may also be turned on by low level control, and turned off by high level control, and may be freely selected according to the type of the switch, which is only an example and is not limited herein.
In this embodiment, the first switch 301 turns on the loop between the first modulation circuit 101 and the isolation circuit 400, so as to implement the signal modulation function of the first modulation circuit 101; the second switch 302 is used for conducting a loop between the first demodulation circuit 102 and the isolation circuit 400, so as to realize the signal demodulation function of the first demodulation circuit 102; a loop between the second modulation circuit 602 and the isolation circuit 400 is turned on through the third switch 501, so that the signal modulation function of the second modulation circuit 602 is realized; the fourth switch 502 is used for conducting a loop between the second demodulation circuit 601 and the isolation circuit 400, so as to realize the signal demodulation function of the second demodulation circuit 601; the switching functions of the first switch 301, the second switch 302, the third switch 501 and the fourth switch 502 realize the bidirectional transmission functions of the first modulation and demodulation circuit 100 and the second modulation and demodulation circuit 600.
Further, the first detection unit 210 includes a first inverter 211, an input end of the first inverter 211 is connected to the feedback signal and is connected to the control end of the fourth switch 502, and an output end of the first inverter 211 is connected to the control end of the third switch 501 and one end of the isolation capacitor C2. The feedback unit 220 includes a second inverter 221, an input end of the second inverter 221 is connected to the other end of the isolation capacitor C2 and a control end of the second switch 302, and an output end of the second inverter 221 is connected to the control end of the first switch 301.
In this embodiment, feedback signals are simultaneously connected to the control terminals of the first inverter 211 and the fourth switch 502, and if the first switch 301, the second switch 302, the third switch 501, and the fourth switch 502 are turned on at a high level and the feedback signals are turned on at a high level, the fourth switch 502 is turned on. The first inverter 211 converts the feedback signal into a first switching signal opposite to the feedback signal (i.e., the level of the feedback signal is opposite to the level of the first switching signal), outputs the first switching signal to the third switch 501, controls the third switch 501 to be turned off, and at this time, the second demodulation circuit 601 is turned on and the second modulation circuit 602 is turned off. The first inverter 211 outputs the first switching signal to the isolation capacitor C2, the isolation capacitor C2 outputs the first switching signal to the input terminal of the second inverter 221 and the control terminal of the second switch 302, the second switch 302 is turned off, the second inverter 221 converts the first switching signal into a second switching signal (i.e., the level of the second switching signal is opposite to the level of the first switching signal) opposite to the first switching signal, and outputs the second switching signal to the control terminal of the first switch 301, the first switch 301 is turned on, and at this time, the first modulation circuit 101 is turned on, and the first demodulation circuit 102 is turned off. The first input signal is modulated by the first modulation circuit 101 to obtain a first modulated signal, which is output to the second demodulation circuit 601 through the first switch 301, the isolation circuit 400 and the fourth switch 502, and demodulated by the second demodulation circuit 601 to obtain a restored first input signal. Similarly, when the feedback signal is at a low level, the second switch 302 and the third switch 501 are turned on, the second modulation circuit 602 modulates the second input signal to obtain a second modulation signal, and the first demodulation circuit 102 demodulates the second modulation signal to obtain a restored second input signal. The switching of the input and the output of the first modulation and demodulation circuit 100 and the second modulation and demodulation circuit 600 is realized, and the purpose of bidirectional transmission is further achieved.
Optionally, with continued reference to fig. 2, the isolation circuit 400 includes a first capacitor C1, one end of the first capacitor C1 is connected to the first switch 301 circuit 300, and the other end of the first capacitor C1 is connected to the second switch 302 circuit 500. After the first modulation circuit 101 or the second modulation circuit 602 demodulates the input signal, the demodulated input signal is transmitted to the second demodulation circuit 601 or the first demodulation circuit 102 in an isolated manner through the first capacitor C1, so that the isolation between a front-stage circuit and a rear-stage circuit is realized, and the risk of electrical safety problems is reduced.
Optionally, the isolation circuit 400 includes a differential transmission unit connected to the first switch 301 unit and configured to perform differential transmission on a modulation signal. In this embodiment, when the whole bidirectional isolation driving circuit uses a differential signal transmission mode, the isolation circuit 400 performs differential transmission on the first modulation signal or the second modulation signal through the differential transmission unit, so as to reduce signal interference.
Based on foretell two-way isolation drive circuit, the utility model discloses still provide a power tube actuating system, including power tube and the above two-way isolation drive circuit, two-way isolation drive circuit with the control end of power tube is connected. In this embodiment, the power tube may be connected to any end of the bidirectional isolation driving circuit, the power tube may be driven and controlled by the bidirectional transmission circuit, and the bidirectional isolation driving circuit may also be used to implement a bidirectional control function for the power tube.
In summary, the utility model provides a two-way isolation drive circuit and power tube driving system, the isolation drive circuit includes the first modem circuit, the first switch circuit, the isolation circuit, the second switch circuit and the second modem circuit that connect gradually, and with the feedback circuit of first switch circuit and second switch circuit connection; receiving a feedback signal by the feedback circuit, and outputting a switching signal according to the feedback signal to control the conduction state of the first switch circuit and the second switch circuit; switching to a modulation mode by the first modulation and demodulation circuit according to the conduction state of the first switch circuit to modulate an input signal, or switching to a demodulation mode to demodulate a modulated signal; switching to a demodulation mode by the second modulation and demodulation circuit according to the conducting state of the second switch to demodulate the modulation signal, or switching to a modulation mode to modulate the input signal; and carrying out isolated transmission by the isolation circuit according to the mode of the first modulation and demodulation circuit and the second modulation and demodulation circuit. The utility model discloses a feedback circuit receives feedback signal and controls first switch circuit and second switch circuit's on-state makes first modem circuit and second modem circuit switch mode, carry out the switching of modulation and demodulation, make two-way isolation drive circuit's only need a set of buffer circuit can realize the two-way transmission function.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (10)
1. A bidirectional isolation driving circuit is characterized by comprising a first modulation and demodulation circuit, a first switch circuit, an isolation circuit, a second switch circuit, a second modulation and demodulation circuit and a feedback circuit, wherein the first modulation and demodulation circuit, the first switch circuit, the isolation circuit, the second switch circuit and the second modulation and demodulation circuit are sequentially connected;
receiving a feedback signal by the feedback circuit, and outputting a switching signal according to the feedback signal to control the conduction state of the first switch circuit and the second switch circuit; switching to a modulation mode by the first modulation and demodulation circuit according to the conduction state of the first switch circuit to modulate an input signal, or switching to a demodulation mode to demodulate a modulated signal; switching to a demodulation mode by the second modulation and demodulation circuit according to the conduction state of the second switch circuit to demodulate the modulation signal, or switching to a modulation mode to modulate the input signal; and carrying out isolated transmission by the isolation circuit according to the mode of the first modulation and demodulation circuit and the second modulation and demodulation circuit.
2. The bi-directional isolation drive circuit of claim 1, wherein the feedback circuit comprises:
the first detection unit is used for converting the feedback signal into a first switching signal and outputting the feedback signal and the first switching signal;
an isolation capacitor for isolating transmission of the first switching signal;
the feedback unit is used for converting the first switching signal into a second switching signal and outputting the first switching signal and the second switching signal;
the first detection unit, the isolation capacitor and the feedback unit are sequentially connected, the feedback unit is further connected with the first switch circuit, and the first detection unit is further connected with the second switch circuit.
3. The bi-directional isolation driver circuit according to claim 1 or 2, wherein the first modem circuit comprises:
the first modulation circuit is connected with the first switch circuit and is used for modulating a first input signal;
and the first demodulation circuit is connected with the first switch circuit and is used for demodulating the second modulation signal transmitted by the isolation circuit.
4. The bi-directional isolation drive circuit of claim 3, wherein the first switch circuit comprises a first switch and a second switch; receiving a first switching signal by the first switch and switching on or off a loop between the first modulation circuit and the isolation circuit; and receiving a second switching signal by the second switch to cut off or conduct a loop between the first demodulation circuit and the isolation circuit.
5. The bi-directional isolation driver circuit of claim 2, wherein the second modem circuit comprises:
the second modulation circuit is connected with the second switch circuit and is used for modulating a second input signal;
and the second demodulation circuit is connected with the second switch circuit and is used for demodulating the first modulation signal transmitted by the isolation circuit.
6. The bi-directional isolation drive circuit of claim 5, wherein the second switch circuit comprises a third switch and a fourth switch; receiving, by the third switch, the feedback signal and turning on or off a loop between a second modulation circuit and an isolation circuit; and the fourth switch receives the first switching signal to conduct a loop between the second demodulation circuit and the isolation circuit.
7. The bidirectional isolation driving circuit of claim 6, wherein the first detection unit comprises a first inverter, an input terminal of the first inverter is connected to the feedback signal and is connected to the control terminal of the fourth switch, and an output terminal of the first inverter is connected to the control terminal of the third switch and one terminal of the isolation capacitor.
8. The bi-directional isolation driving circuit of claim 6, wherein the feedback unit comprises a second inverter, an input terminal of the second inverter is connected to the other terminal of the isolation capacitor and a control terminal of the second switch, and an output terminal of the second inverter is connected to the control terminal of the first switch.
9. The bidirectional isolation driver circuit of claim 1, wherein the isolation circuit comprises a first capacitor, one end of the first capacitor is connected to the first switch circuit, and the other end of the first capacitor is connected to the second switch circuit;
or the isolation circuit comprises a differential transmission unit which is connected with the first switch unit and is used for carrying out differential transmission on the modulation signal.
10. A power tube driving system, comprising a power tube and the bidirectional isolation driving circuit as claimed in any one of claims 1 to 9, wherein the bidirectional isolation driving circuit is connected to a control terminal of the power tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023054592.5U CN214045594U (en) | 2020-12-17 | 2020-12-17 | Bidirectional isolation drive circuit and power tube drive system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023054592.5U CN214045594U (en) | 2020-12-17 | 2020-12-17 | Bidirectional isolation drive circuit and power tube drive system |
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| CN214045594U true CN214045594U (en) | 2021-08-24 |
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| CN202023054592.5U Active CN214045594U (en) | 2020-12-17 | 2020-12-17 | Bidirectional isolation drive circuit and power tube drive system |
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