CN116073809A - Pulse transformer signal bidirectional transmission device and protection method thereof - Google Patents
Pulse transformer signal bidirectional transmission device and protection method thereof Download PDFInfo
- Publication number
- CN116073809A CN116073809A CN202310289142.3A CN202310289142A CN116073809A CN 116073809 A CN116073809 A CN 116073809A CN 202310289142 A CN202310289142 A CN 202310289142A CN 116073809 A CN116073809 A CN 116073809A
- Authority
- CN
- China
- Prior art keywords
- secondary side
- pulse transformer
- signal
- circuit
- transmission device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/0406—Modifications for accelerating switching in composite switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/041—Modifications for accelerating switching without feedback from the output circuit to the control circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
Abstract
The application provides a pulse transformer signal bidirectional transmission device and a protection method thereof, wherein the protection method firstly judges whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition; if the pulse transformer signal bidirectional transmission device has primary secondary side signal transmission competition, controlling a secondary side transmitting circuit in the pulse transformer signal bidirectional transmission device to stop working, enabling the secondary side transmitting circuit to withdraw from competition, and giving the pulse transformer to primary side signal transmission; after the preset time length, the secondary side transmitting circuit is controlled to work again so as to realize secondary side signal transmission and protect the IGBT; through the process, the bidirectional transmission of the primary and secondary side signals can be realized in a time sharing manner.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a pulse transformer signal bidirectional transmission device and a protection method thereof.
Background
When the pulse transformer is adopted to carry out signal transmission on the driving of the IGBT (Insulated Gate Bipolar Transistor ), a low-voltage side control signal of the primary side can be transmitted to the secondary side through the pulse transformer to serve as a high-voltage side control signal, and then the power device is controlled to be turned on or turned off. In addition, fault data or other data which need to be informed of the primary side when the secondary side fails can be transmitted to the primary side in a coding mode through a pulse transformer, the primary side receives the fault code of the secondary side, and after decoding, the secondary side is judged to fail, so that an opening signal is not sent to the secondary side any more, and the IGBT is protected.
However, when the primary side transmits an on signal to the secondary side, the secondary side also needs to transmit a fault code to the primary side through the pulse transformer, at this time, the situation that the primary side and the secondary side compete for using the pulse transformer occurs, the signal on the pulse transformer generates messy codes, the secondary side cannot receive the on signal, and the primary side cannot decode the fault information correctly, so that the IGBT cannot be protected.
Disclosure of Invention
In view of this, the present application provides a pulse transformer signal bidirectional transmission device and a protection method thereof, so as to realize bidirectional transmission of primary and secondary side signals and protection of IGBTs.
In order to achieve the above purpose, the present application provides the following technical solutions:
the first aspect of the present application provides a protection method for a pulse transformer signal bidirectional transmission device, including:
judging whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition or not;
if the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition, controlling a secondary side transmitting circuit in the pulse transformer signal bidirectional transmission device to stop working;
and after the preset time length, controlling the secondary side transmitting circuit to work again.
Optionally, determining whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition includes:
detecting the current flowing through the pulse transformer in the pulse transformer signal bidirectional transmission device;
judging whether the current exceeds a preset current value;
and if the current exceeds the preset current value, judging that the primary and secondary side signal transmission competition occurs.
Optionally, before determining whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition, the method further includes:
judging whether the secondary side transmitting circuit is in a working state or not;
and if the secondary side transmitting circuit is in a working state, executing the step of judging whether the pulse transformer signal bidirectional transmission device has the primary secondary side signal transmission competition or not.
Optionally, determining whether the secondary side sending circuit is in a working state includes:
judging whether a control signal of a switching tube exists in the secondary side transmitting circuit or not as a conducting signal;
and if the control signal is a conduction signal, judging that the secondary side transmitting circuit is in an operating state.
A second aspect of the present application provides a pulse transformer signal bidirectional transmission device, including: the device comprises a main circuit, a first control module, a second control module, a current acquisition module and a judgment module; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first control module is used for controlling a primary side transmitting circuit in the main circuit and receiving signals output by a primary side receiving circuit in the main circuit;
the second control module is used for controlling a secondary side sending circuit in the main circuit and receiving signals output by the judging module;
the current acquisition module is used for acquiring the current in the secondary side transmitting circuit and outputting the current to the judging module;
the secondary side receiving circuit in the main circuit outputs signals to the controlled switching tube;
the current collection module, the judgment module and the second control module are matched to execute the protection method of the pulse transformer signal bidirectional transmission device according to any one of the first aspect.
Optionally, the main circuit includes: the pulse transformer, the primary side transmitting circuit, the primary side receiving circuit, the secondary side transmitting circuit and the secondary side receiving circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive and negative poles of the direct current side of the primary side transmitting circuit are respectively connected with a primary side power supply and a primary side ground, the control end of the primary side transmitting circuit is connected with the output end of the first control module, and the alternating current side of the primary side transmitting circuit is connected with a primary side winding of the pulse transformer;
the positive and negative poles of the direct current side of the secondary side transmitting circuit are respectively connected with a secondary side power supply and a secondary side ground, the control end of the secondary side transmitting circuit is connected with the output end of the second control module, and the alternating current side of the secondary side transmitting circuit is connected with a secondary side winding of the pulse transformer;
the input end of the primary side receiving circuit is connected with the first end of the primary side winding of the pulse transformer, and the input end of the secondary side receiving circuit is connected with the first end of the secondary side winding of the pulse transformer; the first ends of the two windings are the same-name ends;
the output end of the primary side receiving circuit is connected with the input end of the first control module, and the output end of the secondary side receiving circuit is connected with the control end of the controlled switching tube;
the input end of the second control module is connected with the output end of the judging module.
Optionally, the primary side transmitting circuit and the secondary side transmitting circuit are respectively H-bridge topologies;
the primary side receiving circuit comprises: a first comparator; the positive input end of the first comparator is used as the input end of the primary side receiving circuit; the negative input end of the first comparator receives a first reference signal; the output end of the first comparator is used as the output end of the primary side receiving circuit;
the secondary side receiving circuit includes: the second comparator, the first switching tube and the second switching tube; one end of the first switching tube is connected with a secondary side power supply; the other end of the first switching tube is connected with the negative input end of the second comparator through a first resistor; the negative input end of the second comparator is connected with the secondary side ground through a second resistor and the second switching tube in sequence; the negative input end of the second comparator is also connected with one end of a third resistor, and the other end of the third resistor is used as the input end of the secondary side receiving circuit; the positive input end of the second comparator receives a second reference signal; the output end of the second comparator is used as the output end of the secondary side receiving circuit.
Optionally, the current collection module is used for collecting the current flowing through the two lower bridge arm switching tubes in the secondary side sending circuit.
Optionally, the judging module includes: a third comparator, a fourth comparator, and an or gate;
the third comparator and the fourth comparator respectively receive current acquisition signals flowing through two lower bridge arm switching tubes in the secondary side transmitting circuit;
the third comparator and the fourth comparator respectively output signals to two input ends of the OR gate;
the output end of the OR gate is used as the output end of the judging module.
Optionally, the enabling ends of the third comparator and the fourth comparator also respectively receive control signals of corresponding lower bridge arm switching tubes.
The protection method of the pulse transformer signal bidirectional transmission device comprises the steps of firstly judging whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition; if the pulse transformer signal bidirectional transmission device has primary secondary side signal transmission competition, controlling a secondary side transmitting circuit in the pulse transformer signal bidirectional transmission device to stop working, enabling the secondary side transmitting circuit to withdraw from competition, and giving the pulse transformer to primary side signal transmission; after the preset time length, the secondary side transmitting circuit is controlled to work again so as to realize secondary side signal transmission and protect the IGBT; through the process, the bidirectional transmission of the primary and secondary side signals can be realized in a time sharing manner.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the embodiments or the drawings to be used in the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a protection method of a pulse transformer signal bidirectional transmission device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a pulse transformer signal transmission circuit for implementing signal bidirectional transmission according to the prior art;
fig. 3 is a schematic structural diagram of a pulse transformer signal bidirectional transmission device according to an embodiment of the present application;
fig. 4 is a circuit configuration diagram of a pulse transformer signal bidirectional transmission device provided in an embodiment of the present application;
fig. 5 is a schematic signal waveform diagram of the pulse transformer signal bidirectional transmission device provided in the embodiment of the present application under the working condition 1;
fig. 6 is a schematic signal waveform diagram of the pulse transformer signal bidirectional transmission device provided in the embodiment of the present application under the working condition 2;
fig. 7 is a schematic diagram of signal waveforms when contention for primary and secondary side signal transmission occurs in the prior art;
fig. 8 is a schematic diagram of signal waveforms of the pulse transformer signal bidirectional transmission device provided in the embodiment of the present application under the working condition 3;
fig. 9 is a schematic structural diagram of a judging module provided in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The application provides a protection method of a pulse transformer signal bidirectional transmission device, so as to realize bidirectional transmission of primary and secondary side signals and protection of IGBT.
Referring to fig. 1, the protection method of the pulse transformer signal bidirectional transmission device comprises the following steps:
s101, judging whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition or not.
If the pulse transformer signal bidirectional transmission device competes with the primary side signal transmission, the primary side of the pulse transformer cannot receive the fault information sent by the secondary side, the IGBT controlled by the pulse transformer signal bidirectional transmission device cannot be protected, and the secondary side cannot receive the turn-on signal for the IGBT, so S102 needs to be executed.
S102, controlling a secondary side transmitting circuit in the pulse transformer signal bidirectional transmission device to stop working.
The secondary side transmitting circuit stops working, namely the secondary side transmitting circuit stops transmitting fault information to the primary side, so that the secondary side transmitting circuit exits from competition, and the pulse transformer is given to primary side signal transmission.
And S103, after the preset time, controlling the secondary side transmitting circuit to work again.
The specific value of the preset duration can be determined according to the actual application environment, so long as the influence of the primary secondary side signal transmission competition on the pulse transformer is eliminated, the secondary side signal transmission can be normally realized in the follow-up process, and the specific limitation is not carried out here.
After the preset time, the secondary side transmitting circuit is put into operation again, so that secondary side signal transmission can be realized, and the IGBT is protected.
According to the protection method of the pulse transformer signal bidirectional transmission device, when primary secondary side signal transmission competition occurs in the pulse transformer signal bidirectional transmission device, a secondary side sending circuit is controlled to stop working, so that the secondary side sending circuit exits the competition, and the pulse transformer is given to primary side signal transmission; after the preset time length, the secondary side transmitting circuit is controlled to work again so as to realize secondary side signal transmission and protect the IGBT; and further, the bidirectional transmission of the primary and secondary side signals can be realized in a time sharing manner.
It should be noted that, in the prior art, there is a pulse transformer bidirectional transmission and competition protection scheme, as shown in fig. 2, two pulse transformers are used to separate a switching signal from a fault signal, a primary side transmitting module transmits the switching signal to a secondary side receiving module through one pulse transformer, and the secondary side transmitting module transmits the fault signal to the primary side receiving module through another pulse transformer, and the two signals are independent, so that competition can be avoided when only one pulse transformer realizes bidirectional signal transmission, but the scheme has a large number of devices, large volume and high cost.
According to the protection method of the pulse transformer signal bidirectional transmission device, provided by the embodiment, the primary side and the secondary side are actively detected to simultaneously transmit signals, the secondary side transmitting circuit is controlled to actively exit the competition mode, then fault signals generated by the secondary side are informed to the primary side after a certain time interval, and the signal bidirectional transmission is realized by only using one pulse transformer in a time sharing way.
In practical application, when the signal transmission competition of the primary side and the secondary side of the pulse transformer occurs, the pulse transformer signal bidirectional transmission device can generate mutual influence on the pulse transformer, so that the primary side and the secondary side of the pulse transformer can generate large current, and therefore, the S101 of the protection method of the pulse transformer signal bidirectional transmission device can specifically comprise the following steps:
(1) Detecting a current flowing through a pulse transformer in a pulse transformer signal bidirectional transmission device, such as a current flowing through an primary winding or a secondary winding of the pulse transformer; in practical applications, it is preferable to detect the current flowing through the secondary winding for the convenience of executing the following S102 and S103, and because the current flowing through the secondary transmission circuit is the same as the current flowing through the secondary winding under the competing condition, the current flowing through the secondary transmission circuit may be detected nearby.
(2) Judging whether the current exceeds a preset current value; the preset current value can be determined according to practical application conditions, and is not limited herein, so long as the pulse transformer can be characterized for large current caused by competing working conditions at the moment.
(3) If the current exceeds the preset current value, the primary and secondary side signal transmission competition is judged to occur.
According to the embodiment, through current detection, the identification of primary and secondary side signal transmission competition is realized, the follow-up steps can be timely executed, and the bidirectional signal transmission and protection are completed.
On the basis of the above embodiment, preferably, the protection method of the pulse transformer signal bidirectional transmission device may further include, before executing S101: judging whether the secondary side transmitting circuit is in a working state or not; if the secondary side transmission circuit is in an operating state, S101 is executed.
Specifically, determining whether the secondary side transmitting circuit is in an operating state may include: judging whether a control signal of a switching tube exists in the secondary side transmitting circuit or not as a conducting signal; if the control signal is an on signal, the secondary side transmitting circuit is judged to be in an operating state.
That is, it is necessary to perform the contention resolution only when the secondary side transmission circuit is in an operating state; if the secondary side transmitting circuit is not in a working state, the primary secondary side signal transmission competition does not occur, and competition identification is not needed, so that corresponding loss caused by realizing the competition identification can be avoided.
Another embodiment of the present application further provides a pulse transformer signal bidirectional transmission device, as shown in fig. 3, including: the device comprises a main circuit, a first control module 11, a second control module 12, a current acquisition module 13 and a judgment module 14; wherein:
the first control module 11 is configured to control the primary side transmitting circuit 101 in the main circuit and receive a signal output by the primary side receiving circuit 202 in the main circuit.
The second control module 12 is configured to control the secondary side transmitting circuit 201 in the primary circuit, and receive the signal output by the judging module 14.
The current collection module 13 is configured to collect the current in the secondary side transmitting circuit 201, and output the current to the judging module 14.
The secondary side receiving circuit 102 in the main circuit outputs a signal to a controlled switching tube, which specifically refers to an IGBT shown in the upper right corner of the figure; the other IGBT shown in the lower right hand corner of the figure is also controlled by another pulse transformer signal bi-directional transmission device.
The current collection module 13, the judging module 14 and the second control module 12 are matched to execute the protection method of the pulse transformer signal bidirectional transmission device according to any of the above embodiments, and specific processes and principles of the protection method are described in the above embodiments, and are not described in detail herein.
Referring to fig. 4, the main circuit may specifically include: a pulse transformer, a primary side transmission circuit 101, a primary side reception circuit 202, a secondary side transmission circuit 201, and a secondary side reception circuit 102; wherein: the positive and negative poles of the DC side of the primary side transmitting circuit 101 are respectively connected with a primary side power supply V DD_P The control end of the pulse transformer is connected with the output end of the first control module 11, and the alternating current side of the pulse transformer is connected with the primary winding (TRP and TRN are respectively arranged at two ends) of the pulse transformer. The positive and negative poles of the secondary side transmitting circuit 201 on the direct current side are respectively connected with a secondary side power supply V DD_S And the control end of the secondary winding is connected with the output end of the second control module 12, and the alternating current side of the secondary winding is connected with the secondary winding of the pulse transformer (the two ends are INP and INN respectively). An input end of the primary side receiving circuit 202 is connected with a first end TRP of a primary side winding of the pulse transformer, and an input end of the secondary side receiving circuit 102 is connected with a first end INP of a secondary side winding of the pulse transformer; the first ends TRP and INP of the two windings are the same name ends; the second ends TRN and INN of the two windings are identical to each other. An output end of the primary side receiving circuit 202 is connected with an input end of the first control module 11, and an output end of the secondary side receiving circuit 102The terminals are connected to the control terminals of controlled switching transistors (IGBTs as shown in the upper right hand corner of the figure). The input end of the second control module 12 is connected with the output end of the judging module 14, and the input end of the judging module 14 is connected with the output end of the current collecting module 13.
In practical applications, the primary side transmitting circuit 101 and the secondary side transmitting circuit 201 may be respectively H-bridge topologies shown in fig. 4; the primary side transmission circuit 101 includes switching transistors Q1 to Q4; the secondary side transmission circuit 201 includes switching transistors Q5 to Q8 therein.
The primary side receive circuitry 202 may include the circuitry shown in fig. 4: a first comparator CP1; the positive input end of the first comparator CP1 is used as the input end of the primary side receiving circuit 202 and is connected with the first end TRP of the primary side winding of the pulse transformer; a negative input end of the first comparator CP1 receives a first reference signal Vref; the output terminal of the first comparator CP1, which is the output terminal of the primary side receiving circuit 202, is connected to the input terminal of the first control module 11.
The secondary side receiving circuit 102 may include the one shown in fig. 4: the second comparator CP2, the first switching tube Q9 and the second switching tube Q10; one end of the first switch tube Q9 is connected with the secondary side power supply V DD_S The method comprises the steps of carrying out a first treatment on the surface of the The other end of the first switching tube Q9 is connected with the negative input end of the second comparator CP2 through a first resistor R1; the negative input end of the second comparator CP2 is connected with the secondary side ground through a second resistor R2 and a second switching tube Q10 in sequence; the negative input end of the second comparator CP2 is further connected to one end of a third resistor R3, and the other end of the third resistor R3 is used as an input end of the secondary receiving circuit 102 and is connected to the first end INP of the secondary winding of the pulse transformer; the positive input end of the second comparator CP2 receives a second reference signal Vref; the output terminal of the second comparator CP2 serves as the output terminal of the secondary side receiving circuit 102, and is connected to the control terminal of a controlled switching transistor (IGBT shown in the upper right corner of the figure).
In practical applications, each of the switching transistors Q1 to Q10 may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), but is not limited thereto.
Referring to fig. 4, the pulse transformer signal bidirectional transmission device specifically has the following three working conditions:
working condition 1, when the primary side transmits a switching signal for enabling the controlled switching tube to be switched on or off to the secondary side through the pulse transformer, the specific control logic is as follows:
after receiving the turn-on signal sent by the upper computer, the first control module 11 controls the switching tubes Q2 and Q3 on the primary side to be turned on, a negative pulse is input between the TRP and TRN at the two ends of the primary winding of the pulse transformer, and INP outputs "-", INN outputs "+", because INP is negative, the negative input end of the second comparator CP2 is lower than the second reference signal Vref received by the positive input end thereof, the output Vout of the second comparator CP2 is high, and the corresponding IGBT is controlled to be turned on; and meanwhile, the switching tube Q10 is switched on to latch an IGBT switching-on signal. After receiving the turn-off signal sent by the upper computer, the first control module 11 controls the switching tubes Q1 and Q4 on the primary side to be turned on, a positive pulse is input between the TRP and TRN at the two ends of the primary winding of the pulse transformer, and INP and INN are output "+" and "-" at the two ends of the secondary winding of the pulse transformer, and because INP is positive, the negative input end of the second comparator CP2 is higher than the second reference signal Vref received by the positive input end thereof, the Vout output by the second comparator CP2 is low, and the corresponding IGBT is controlled to be turned off; and meanwhile, the switching tube Q9 is switched on, and an IGBT switching-off signal is latched. In this condition, the operating waveform on the pulse transformer is shown in fig. 5.
Working condition 2, when the secondary side transmits fault coding signals to the primary side through the pulse transformer, the specific control logic is as follows:
the fault information generated by the secondary side can form a fault coding signal in a coding mode and is sent to the primary side through a pulse transformer; if the second control module 12 controls the switching tubes Q5 and Q8 to be conducted, positive signals are sent to the primary side; if the second control module 12 controls the switching transistors Q6 and Q7 to be turned on, a negative signal will be sent to the primary side. The positive input terminal of the primary side first comparator CP1 receives the TRP signal, compares the TRP signal with the first reference signal Vref received by the negative input terminal thereof, and outputs the encoded signal to the first control module 11. In this condition, the operating waveform on the pulse transformer is shown in fig. 6.
Working condition 3, when primary and secondary sides signal the pulse transformer at the same time, and the pulse transformer has the working condition of two-way signal transmission competition, the specific control logic is as follows:
in the prior art that does not execute the protection method provided by the above embodiment, the switching transistors Q2 and Q3 on the primary side are turned on to send an on signal to the secondary side, the secondary side also turns on the switching transistors Q5 and Q8 to send a fault coding signal to the primary side, and there is signal competition on the pulse transformer, at this time, the primary side cannot receive the fault information sent by the secondary side, the IGBT cannot be protected, and the secondary side cannot receive the on signal; the pulse transformer operating waveform is shown in fig. 7.
In the embodiment, the current acquisition module 13 is configured to acquire the current in the secondary side transmitting circuit 201, as shown in fig. 4, and specifically acquire the current flowing through two lower bridge arm switching tubes (i.e., Q6 and Q8) in the secondary side transmitting circuit 201; then for regime 1 above: when the primary side transmits signals to the secondary side, the switching tubes Q6 and Q8 are in an off state, and the current flowing through the switching tubes Q6 and Q8 is zero; for condition 2 above: when the secondary side transmits signals to the primary side, the primary side switching tubes Q1 to Q4 are in an off state, the input impedance of the first comparator CP1 is high, no large load exists when the switching tubes Q6 and Q8 are turned on, the current flowing through the switching tubes Q6 and Q8 is very small, and usually only tens of milliamperes exist; for the above condition 3: the primary side and the secondary side simultaneously send signals to the pulse transformer, the switching tubes Q2 and Q3 are switched on at the primary side, at the moment, exciting current of the primary side for the pulse transformer flows in from the second end TRN of the primary side winding and flows out from the first end TRP of the primary side winding, exciting current flows in from the different name end, the switching tubes Q5 and Q8 are switched on at the secondary side, exciting current of the secondary side for the pulse transformer flows in from the first end INP of the secondary side winding and flows out from the second end INN of the secondary side winding, exciting current flows in from the same name end, magnetic fluxes of the primary side and the secondary side for the pulse transformer are offset, inductance is reduced, and large current Ip appears in both the primary side and the secondary side.
In the circuit shown in fig. 4, the current flowing through the switching tube Q8 is detected when the switching tube Q8 is turned on, the current flowing through the switching tube Q6 is detected when the switching tube Q6 is turned on, and then the judgment module 14 judges whether the pulse transformer has competition or not. The switching tube Q8 is turned on and has a large current Ip or the switching tube Q6 is turned on and has a large current Ip, then the pulse transformer is considered to compete, the judging module 14 informs the second control module 12 of a competition signal, the secondary side is controlled to actively interrupt sending of the fault code, the fault code is repeatedly sent to the primary side after waiting for a preset time period err_bk, the pulse transformer is given off to the primary side during the preset time period err_bk, and meanwhile failure caused by the large current flowing in the MOSFET is avoided, and specific protection logic is shown in fig. 8.
To implement the above-mentioned determination process, fig. 9 provides a specific implementation form of the determination module 14, which specifically includes: the third comparator CP3, the fourth comparator CP4, OR gate OR; the third comparator CP3 and the fourth comparator CP4 respectively receive current collection signals flowing through the two lower bridge arm switching tubes in the secondary side transmitting circuit 201; as shown in fig. 9, the third comparator CP3 receives the current acquisition signal I flowing through the switching transistor Q6 P_Q6 The fourth comparator CP4 receives the current-collecting signal I flowing through the switching transistor Q8 P_Q8 The method comprises the steps of carrying out a first treatment on the surface of the The third comparator CP3 and the fourth comparator CP4 output signals to two input terminals of the OR gate OR, respectively; the output of the OR gate OR serves as the output of the decision block 14.
In order to avoid current detection loss when no competition exists, the switching tubes Q6 and Q8 can be set to not perform corresponding current detection when not being switched on, namely, the enabling ends of the third comparator CP3 and the fourth comparator CP4 can be set to respectively receive control signals of corresponding lower bridge arm switching tubes; as shown in fig. 9, the third comparator CP3 enables the reception of the control signal of the switching transistor Q6, and the fourth comparator CP4 enables the reception of the control signal of the switching transistor Q8.
At this time, the control signals of the switching transistors Q6 and Q8 are respectively used as the enable signals of the corresponding comparators, the enable overcurrent detection signals are output when the switching transistors are turned on, the two overcurrent detection signals are summed and output to the second control module 12 after being subjected to OR operation, and any overcurrent detection signal indicates that the current of the corresponding switching transistor is excessive, so that the second control module 12 is caused to execute S102 and S103 in the protection method.
According to the embodiment, signal bidirectional transmission is realized through the single pulse transformer, the secondary side fault information can be coded and sent to the primary side, the secondary side can be actively detected and controlled to exit from competition when competition occurs, then the fault information is sent to the primary side after the preset time length, and the circuit device is few, the structure is simple, the size is small and the cost is low.
The same and similar parts of the embodiments in this specification are all mutually referred to, and each embodiment focuses on the differences from the other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The features described in the various embodiments of the present disclosure may be interchanged or combined with one another in the description of the disclosed embodiments to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for protecting a pulse transformer signal bidirectional transmission device, comprising:
judging whether the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition or not;
if the pulse transformer signal bidirectional transmission device has primary and secondary side signal transmission competition, controlling a secondary side transmitting circuit in the pulse transformer signal bidirectional transmission device to stop working;
and after the preset time length, controlling the secondary side transmitting circuit to work again.
2. The method for protecting a pulse transformer signal bi-directional transmission device according to claim 1, wherein determining whether the pulse transformer signal bi-directional transmission device has primary and secondary side signal transmission competition comprises:
detecting the current flowing through the pulse transformer in the pulse transformer signal bidirectional transmission device;
judging whether the current exceeds a preset current value;
and if the current exceeds the preset current value, judging that the primary and secondary side signal transmission competition occurs.
3. The protection method of a pulse transformer signal bidirectional transmission device according to claim 1 or 2, further comprising, before determining whether primary-secondary signal transmission competition occurs in the pulse transformer signal bidirectional transmission device:
judging whether the secondary side transmitting circuit is in a working state or not;
and if the secondary side transmitting circuit is in a working state, executing the step of judging whether the pulse transformer signal bidirectional transmission device has the primary secondary side signal transmission competition or not.
4. The method for protecting a pulse transformer signal bi-directional transmission device according to claim 3, wherein determining whether said secondary side transmission circuit is in an operating state comprises:
judging whether a control signal of a switching tube exists in the secondary side transmitting circuit or not as a conducting signal;
and if the control signal is a conduction signal, judging that the secondary side transmitting circuit is in an operating state.
5. A pulse transformer signal bi-directional transmission device, comprising: the device comprises a main circuit, a first control module, a second control module, a current acquisition module and a judgment module; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first control module is used for controlling a primary side transmitting circuit in the main circuit and receiving signals output by a primary side receiving circuit in the main circuit;
the second control module is used for controlling a secondary side sending circuit in the main circuit and receiving signals output by the judging module;
the current acquisition module is used for acquiring the current in the secondary side transmitting circuit and outputting the current to the judging module;
the secondary side receiving circuit in the main circuit outputs signals to the controlled switching tube;
the current collection module, the judgment module and the second control module cooperate to execute the protection method of the pulse transformer signal bidirectional transmission device according to any one of claims 1 to 4.
6. The pulse transformer signal bi-directional transmission device of claim 5, wherein the main circuit comprises: the pulse transformer, the primary side transmitting circuit, the primary side receiving circuit, the secondary side transmitting circuit and the secondary side receiving circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive and negative poles of the direct current side of the primary side transmitting circuit are respectively connected with a primary side power supply and a primary side ground, the control end of the primary side transmitting circuit is connected with the output end of the first control module, and the alternating current side of the primary side transmitting circuit is connected with a primary side winding of the pulse transformer;
the positive and negative poles of the direct current side of the secondary side transmitting circuit are respectively connected with a secondary side power supply and a secondary side ground, the control end of the secondary side transmitting circuit is connected with the output end of the second control module, and the alternating current side of the secondary side transmitting circuit is connected with a secondary side winding of the pulse transformer;
the input end of the primary side receiving circuit is connected with the first end of the primary side winding of the pulse transformer, and the input end of the secondary side receiving circuit is connected with the first end of the secondary side winding of the pulse transformer; the first ends of the two windings are the same-name ends;
the output end of the primary side receiving circuit is connected with the input end of the first control module, and the output end of the secondary side receiving circuit is connected with the control end of the controlled switching tube;
the input end of the second control module is connected with the output end of the judging module.
7. The pulse transformer signal bi-directional transmission device of claim 6, wherein said primary side transmit circuit and said secondary side transmit circuit are each H-bridge topologies;
the primary side receiving circuit comprises: a first comparator; the positive input end of the first comparator is used as the input end of the primary side receiving circuit; the negative input end of the first comparator receives a first reference signal; the output end of the first comparator is used as the output end of the primary side receiving circuit;
the secondary side receiving circuit includes: the second comparator, the first switching tube and the second switching tube; one end of the first switching tube is connected with a secondary side power supply; the other end of the first switching tube is connected with the negative input end of the second comparator through a first resistor; the negative input end of the second comparator is connected with the secondary side ground through a second resistor and the second switching tube in sequence; the negative input end of the second comparator is also connected with one end of a third resistor, and the other end of the third resistor is used as the input end of the secondary side receiving circuit; the positive input end of the second comparator receives a second reference signal; the output end of the second comparator is used as the output end of the secondary side receiving circuit.
8. The pulse transformer signal bi-directional transmission device of claim 7, wherein the current collection module is configured to collect currents flowing through two lower bridge arm switching tubes in the secondary side transmitting circuit.
9. The pulse transformer signal bi-directional transmission device of claim 8, wherein the determining module comprises: a third comparator, a fourth comparator, and an or gate;
the third comparator and the fourth comparator respectively receive current acquisition signals flowing through two lower bridge arm switching tubes in the secondary side transmitting circuit;
the third comparator and the fourth comparator respectively output signals to two input ends of the OR gate;
the output end of the OR gate is used as the output end of the judging module.
10. The pulse transformer signal bi-directional transmission device of claim 9, wherein the enable terminals of the third comparator and the fourth comparator further respectively receive control signals of corresponding lower leg switching tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310289142.3A CN116073809B (en) | 2023-03-23 | 2023-03-23 | Pulse transformer signal bidirectional transmission device and protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310289142.3A CN116073809B (en) | 2023-03-23 | 2023-03-23 | Pulse transformer signal bidirectional transmission device and protection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116073809A true CN116073809A (en) | 2023-05-05 |
| CN116073809B CN116073809B (en) | 2023-06-16 |
Family
ID=86180461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310289142.3A Active CN116073809B (en) | 2023-03-23 | 2023-03-23 | Pulse transformer signal bidirectional transmission device and protection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116073809B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6422138A (en) * | 1987-07-17 | 1989-01-25 | Hitachi Ltd | Data transmission equipment |
| JP2010028197A (en) * | 2008-07-15 | 2010-02-04 | Toyota Industries Corp | Signal transfer circuit using pulse transformer |
| WO2014059620A1 (en) * | 2012-10-17 | 2014-04-24 | 深圳市安能能源技术有限公司 | Isolated driving circuit |
| CN103929063A (en) * | 2014-04-15 | 2014-07-16 | 矽力杰半导体技术(杭州)有限公司 | Primary-side feedback control method and isolation converter based on primary-side feedback control |
| CN109347066A (en) * | 2018-11-30 | 2019-02-15 | 深圳市必易微电子有限公司 | A kind of pair side control circuit and its isolated power converting circuit and over-voltage protection method |
| CN109638797A (en) * | 2019-02-01 | 2019-04-16 | 上海理工大学 | A kind of Multi- Switch synchronization isolated drive circuit with overcurrent protection |
| CN111162678A (en) * | 2020-01-24 | 2020-05-15 | 杭州必易微电子有限公司 | Secondary side control circuit and control method of isolated converter and isolated converter |
| CN111654193A (en) * | 2019-07-26 | 2020-09-11 | 广州金升阳科技有限公司 | Drive control method and circuit thereof |
| WO2022095074A1 (en) * | 2020-11-05 | 2022-05-12 | 无锡硅动力微电子股份有限公司 | Power conversion control circuit having integrated high-voltage capacitor isolation communication |
| WO2023010233A1 (en) * | 2021-07-31 | 2023-02-09 | 华为数字能源技术有限公司 | Converter and control method for converter |
-
2023
- 2023-03-23 CN CN202310289142.3A patent/CN116073809B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6422138A (en) * | 1987-07-17 | 1989-01-25 | Hitachi Ltd | Data transmission equipment |
| JP2010028197A (en) * | 2008-07-15 | 2010-02-04 | Toyota Industries Corp | Signal transfer circuit using pulse transformer |
| WO2014059620A1 (en) * | 2012-10-17 | 2014-04-24 | 深圳市安能能源技术有限公司 | Isolated driving circuit |
| CN103929063A (en) * | 2014-04-15 | 2014-07-16 | 矽力杰半导体技术(杭州)有限公司 | Primary-side feedback control method and isolation converter based on primary-side feedback control |
| CN109347066A (en) * | 2018-11-30 | 2019-02-15 | 深圳市必易微电子有限公司 | A kind of pair side control circuit and its isolated power converting circuit and over-voltage protection method |
| CN109638797A (en) * | 2019-02-01 | 2019-04-16 | 上海理工大学 | A kind of Multi- Switch synchronization isolated drive circuit with overcurrent protection |
| CN111654193A (en) * | 2019-07-26 | 2020-09-11 | 广州金升阳科技有限公司 | Drive control method and circuit thereof |
| CN111162678A (en) * | 2020-01-24 | 2020-05-15 | 杭州必易微电子有限公司 | Secondary side control circuit and control method of isolated converter and isolated converter |
| WO2022095074A1 (en) * | 2020-11-05 | 2022-05-12 | 无锡硅动力微电子股份有限公司 | Power conversion control circuit having integrated high-voltage capacitor isolation communication |
| WO2023010233A1 (en) * | 2021-07-31 | 2023-02-09 | 华为数字能源技术有限公司 | Converter and control method for converter |
Non-Patent Citations (1)
| Title |
|---|
| 张佃青;: "新型IGBT驱动脉冲变压器电路设计", 变频器世界, no. 03 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116073809B (en) | 2023-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110022168B (en) | Communication using inductive coupling | |
| EP1215808B1 (en) | A power supply circuit and method thereof to detect demagnitization of the power supply | |
| EP2063520A1 (en) | Dc/dc power converting apparatus | |
| JP4821339B2 (en) | Bidirectional pulse signal transmission circuit and isolated switching power supply | |
| US10232718B2 (en) | On-board electrical system isolating circuit for DC/DC converters, and method for isolating an on-board electrical system from a DC/DC converter | |
| CN103872918A (en) | Digital Communication Link Between Secondary Side and Primary Side of Switching Power Converter | |
| US20190123661A1 (en) | Electric power conversion device | |
| US9806624B2 (en) | System for information feedback through isolation in power converters | |
| CN104242608B (en) | Power semiconductor modular | |
| CN116073809B (en) | Pulse transformer signal bidirectional transmission device and protection method thereof | |
| CN114759809A (en) | Switching power supply and method for use in a switching power supply | |
| KR20190064473A (en) | Inverter circuit and X-ray irradiator | |
| CN110967619B (en) | Detection circuit, circuit detection and control method | |
| US6362985B1 (en) | Power transmission apparatus and method for power transmission | |
| US11888411B2 (en) | Power conversion device | |
| US10811984B2 (en) | Bidirectional DC-to-DC converter with voltage limitation device including switching element and voltage limitation capacitor | |
| CN110380517B (en) | Wireless power transmission system and transmission method | |
| US11658582B2 (en) | Method of communication through a flyback power transformer using a zero voltage switching pulse in CRCM mode | |
| EP4266532A1 (en) | Bidirectional dc/dc converter and control method therefor, and vehicle | |
| CN105281551A (en) | Activating circuit of a resonant converter | |
| CN110089016B (en) | Gate driving device | |
| WO2004112230A1 (en) | Switch mode power circuit | |
| US20210184501A1 (en) | Wireless power transmission with modular output | |
| JP2629585B2 (en) | Inrush current suppression circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |