CN116800246B - Isolation circuit and fusion shooting device - Google Patents
Isolation circuit and fusion shooting device Download PDFInfo
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- CN116800246B CN116800246B CN202310685430.0A CN202310685430A CN116800246B CN 116800246 B CN116800246 B CN 116800246B CN 202310685430 A CN202310685430 A CN 202310685430A CN 116800246 B CN116800246 B CN 116800246B
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- 238000002955 isolation Methods 0.000 title claims abstract description 220
- 230000004927 fusion Effects 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 84
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000008054 signal transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
Abstract
The application discloses isolation circuit and fusion shooting device, wherein, isolation circuit includes: the input module is used for connecting the pulse signal generating end and the pulse signal ground wire; the first driving module is used for being connected with the load triggering end; the capacitor isolation module is arranged between the input module and the first driving module and comprises a first isolation capacitor, a second isolation capacitor and a protection unit, wherein the first isolation capacitor is connected in series at the pulse signal generation end; the second isolation capacitor and the protection unit are connected in series on the pulse signal ground line and are used for isolating the ground potential between the pulse signal generation end and the load. The pulse signal generating end is connected in series with the first isolation capacitor, the pulse signal ground wire is connected in series with the second isolation capacitor to realize complete isolation between the pulse signal generating end and the load, and meanwhile, the pulse signal ground wire where the second isolation capacitor is arranged is also connected in series with the protection unit to protect the second isolation capacitor from breakdown or severe ground potential change without influencing the load side.
Description
Technical Field
The application belongs to the technical field of signal transmission, and particularly relates to an isolation circuit and a fusion shooting device.
Background
In the field of pulse signal transmission, signal distortion may occur during signal transmission due to characteristics such as high frequency, high speed, high voltage, etc. of the signal. Such as common mode signal interference, ground potential differences, etc., which may cause distortion of the signal, thereby affecting the quality and accuracy of the signal transmission. For example, in fusion reactions, a high-speed camera is required to capture the reaction process, typically a trigger signal of the high-speed camera is generated in other devices, transmission between different devices is required, for example, in a fusion reaction device or an additional pulse signal generating device, and transmission to the high-speed camera is required to trigger the high-speed camera to capture. Because the surrounding electrical environment of the fusion reaction device is complex, various electrical noise interferences can exist in the pulse signal transmission process, and the problems of false triggering or incapacity of triggering can be caused.
Moreover, since different devices are not commonly grounded, if the ground potential of the pulse signal generating device may vary greatly under the influence of the surrounding electrical environment of the fusion reaction apparatus, if the ground potential of the pulse signal generating device is higher than the ground potential of the high-speed camera side, the high-speed camera may be damaged, and if the ground potential of the pulse signal generating device is lower than the ground potential of the high-speed camera side, the high-speed camera may not be triggered.
Based on this, how to reliably transmit the pulse signal is a technical problem to be solved.
Disclosure of Invention
The application provides an isolation circuit and a fusion shooting device, which are used for solving the technical problem of how to reliably transmit pulse signals.
The technical scheme adopted by the application is as follows:
according to a first aspect, embodiments of the present application provide an isolation circuit, including: the input module is used for connecting the pulse signal generating end and the pulse signal ground wire; the first driving module is used for being connected with the load triggering end; the capacitor isolation module is arranged between the input module and the first driving module and comprises a first isolation capacitor, a second isolation capacitor and a protection unit, wherein the first isolation capacitor is connected in series at the pulse signal generation end; the second isolation capacitor and the protection unit are connected in series on the pulse signal ground line and are used for isolating the ground potential between the pulse signal generation end and the load.
In one embodiment, the protection unit includes: an over-current protection unit and/or an over-voltage protection unit.
In one embodiment, the first driving module includes: the control switch is connected between the load trigger end and the load ground wire, and the control end of the control switch is connected with the first isolation capacitor and is connected with the load ground wire through the first resistor.
In one embodiment, the time constant of the series capacitance of the first isolation capacitance and the second isolation capacitance and the first resistance is N times the duration of the low level of the pulse signal, where N is greater than 1.
In one embodiment, a time constant of a series capacitance and a first resistance of the first isolation capacitance and the second isolation capacitance is less than a low level duration of the pulse signal; the first driving module further includes: the pulse triggering self-locking circuit is connected between the capacitive isolation module and the control end of the control switch and is used for restoring the pulse signal output by the capacitive isolation module.
In one embodiment, the device further comprises a second driving module and an optical coupler isolation module, wherein the input end of the optical coupler isolation module is connected with the input module, and the output end of the optical coupler isolation module is connected with the second driving module through an inverter, wherein the level states of trigger signals of the first driving module and the second driving module are opposite; and an isolation selection module is arranged between the optical coupling isolation module and the capacitance isolation module and is used for selecting the enabling of the optical coupling isolation module or the enabling of the capacitance isolation module according to the signal synchronization state of the pulse signal generation end and the input ends of the first driving module and the second driving module.
In one embodiment, a signal synchronization state detection circuit is further arranged between the pulse signal generation end and the input end of the driving module, and the output end of the synchronization state detection circuit is connected with the isolation selection module.
In one embodiment, the input module further comprises a second resistor connected between the pulse signal generating terminal and the pulse signal ground for simulating a resistive load.
In one embodiment, a third resistor is further connected in series at the input of the driving module.
According to a second aspect, an embodiment of the present application provides a fusion shooting device, including: an isolation circuit of any one of the above first aspects, a shooting trigger terminal and a pulse signal generation terminal; the isolation circuit is connected between the shooting trigger end and the pulse signal input end. The embodiment of the application has at least the following beneficial effects:
one end of the input module is connected with the pulse signal generating end, the other end of the input module is connected with the pulse signal ground wire of the pulse signal generating end, the pulse signal generating end is connected with the first isolation capacitor in series, the pulse signal ground wire is connected with the second isolation capacitor in series to realize complete isolation between the pulse signal generating end and the load, and meanwhile, because the fusion reaction device is in a high-voltage working state, the ground potential at one side of the pulse signal generating end can be severely lifted, if the ground potential exceeds the withstand voltage value of the second isolation capacitor, the second isolation capacitor can be broken down, the isolation effect is lost, and the load is damaged. Therefore, a protection unit is connected in series with the pulse signal ground wire where the second isolation capacitor is located, so that the second isolation capacitor is protected from breakdown or severe ground potential change, and the load side is not affected.
Further, the isolation circuit further comprises a second driving module and an optical coupler isolation module, wherein the input end of the optical coupler isolation module is connected with the input module, the output end of the optical coupler isolation module is connected with the second driving module through an inverter, and an isolation selection module is arranged between the optical coupler isolation module and the capacitance isolation module and used for selecting the enabling of the optical coupler isolation module or the enabling of the capacitance isolation module according to the signal synchronization state of the pulse signal generation end and the input ends of the first driving module and the second driving module. The optical coupler isolation module is adopted as an alternative circuit, the advantages of the capacitance isolation module and the optical coupler isolation module can be fully utilized, and due to the fact that the service life of the capacitance isolation module is long, the capacitance isolation module can be adopted for isolation under most conditions, if the pulse signal frequency is changed, namely the frequency is reduced, and when the passing property of the capacitance isolation module is poor, the capacitance isolation module can be temporarily switched to the optical coupler isolation module for pulse signal isolation. The optical coupler isolation module is not required to be in a working state for a long time, so that the isolation of pulse signals in a wider range is realized under the condition of guaranteeing the service life.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic diagram of an alternative isolation circuit module according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an alternative isolation circuit according to an embodiment of the present application;
FIG. 3 is a schematic waveform diagram of an alternative isolation circuit according to an embodiment of the present application;
FIG. 4 is a schematic waveform diagram of another alternative isolation circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another alternative isolation circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram of another alternative isolation circuit according to an embodiment of the present application.
Detailed Description
In order to more clearly illustrate the general concepts of the present application, a detailed description is provided below by way of example in connection with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that, in the case of no conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In addition, in the description of the present application, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As described in the background section, various electrical noise interference may exist in the pulse signal transmission process, and may cause false triggering or failure to trigger, for this, in the prior art, some isolation schemes exist, for example, an inductive isolation manner is adopted, and a high isolation effect can be achieved by connecting an inductive element in series to a signal transmission line, but due to the characteristics of the inductive element, problems such as distortion and waveform deformation of a signal may be caused, so that load false triggering or triggering failure may be caused. In addition, the inductively isolated secondary coil can cause the load trigger port to be in a short circuit condition for a long period of time when no signal is present.
In another prior art, there is also a scheme of isolating by using an optocoupler isolator, however, the light emitting diode in the optocoupler isolator may age after a long time, resulting in a decrease in performance of the optocoupler isolator.
In other prior arts, there are capacitive isolation schemes, for example, the capacitive isolation scheme in the related patent document CN114448419a only isolates the pulse signal, but not isolates the ground, and for the electrical environment around the fusion reaction device, a large potential difference may occur between the pulse signal generating device and the high-speed camera, which may cause a phenomenon that the camera cannot be triggered or damaged.
Based on this, an embodiment of the present application provides an isolation circuit, as shown in fig. 1, including: an input module 10 for connecting the pulse signal generating end and the pulse signal ground wire; a first driving module 30, configured to connect with a load trigger terminal; the capacitor isolation module 20 is arranged between the input module 10 and the first driving module 30, and comprises a first isolation capacitor C1, a second isolation capacitor C2 and a protection unit 21, wherein the first isolation capacitor C1 is connected in series at the pulse signal generation end; the second isolation capacitor C2 is connected in series with the protection unit 21 on the pulse signal ground line for isolating the ground potential between the pulse signal generating end and the load.
As an exemplary embodiment, the isolation circuit may include an input terminal for receiving a pulse signal, where one end of the input terminal is connected to a pulse signal generating terminal, and one end of the input terminal is connected to a pulse signal ground line of the pulse signal generating terminal, a first isolation capacitor C1 is connected in series to the pulse signal generating terminal, and a second isolation capacitor is connected in series to the pulse signal ground line to achieve complete isolation between the pulse signal generating terminal and a load, and meanwhile, since the fusion reaction device is in a high-voltage operation state, a ground potential on one side of the pulse signal generating terminal may be severely raised, if the withstand voltage value of the second isolation capacitor C2 is exceeded, the second isolation capacitor C2 may break down, and thus the isolation effect is lost, resulting in load damage. Therefore, the protection unit 21 is also connected in series to the pulse signal ground where the second isolation capacitor C2 is located, so as to protect the second isolation capacitor C2 from breakdown or severe ground potential change, which has no influence on the load side.
For example, when the pulse signal is at the high level Vih, the first isolation capacitor C1 outputs an edge trigger signal with the voltage Vih at the moment when the input signal jumps from 0V to Vih, and the trigger signal may trigger the first driving module 30 to output the driving signal to the load.
When the pulse signal is at a low level, the first isolation capacitor C1 outputs a-Vih trigger signal at a voltage level at the moment when the input signal Vih is changed from a transition to 0V, or outputs 0V, so that the first driving module 30 stops outputting the driving signal to the load.
As an exemplary embodiment, the protection unit 21 may include an overcurrent protection unit or an overvoltage protection unit, and an exemplary overcurrent protection unit may employ an overcurrent protection device such as a fuse, a positive temperature thermistor, or the like. The overvoltage protection unit can adopt a pulse oscillation protection circuit or a thyristor relay overvoltage protection circuit.
When the ground potential at one side of the pulse signal generating end is possibly raised severely or higher peak ground noise occurs, the potential difference at two sides of the second isolation capacitor C2 may exceed the withstand voltage value, damage or false triggering can be caused to the load, and the overcurrent protection unit can break or clamp the current at a fixed current when the ground potential difference which changes severely occurs. The overvoltage protection unit can clamp the potential difference at a fixed potential difference, so that the protection of a later-stage load is realized.
As an exemplary embodiment, the first driving module 30 may amplify the pulse signal isolated by the capacitive isolation module 20 using an amplifying circuit to generate a trigger signal of the load.
Illustratively, an input of the amplifying circuit is connected to the first isolation capacitor C1, and an output of the amplifying circuit is connected to the first driving module 30. In this embodiment, the amplifying circuit may use a triode, a MOS transistor, or an IGBT, etc. to control the switch. A signal amplifying chip, such as a dual-channel pulse amplifying excitation circuit chip, an isolation buffer, or the like, may also be employed. In this embodiment, a control switch is described as an example:
the control switch Q1 is connected between the load control end and the load ground wire, the control end of the control switch Q1 is connected with the first isolation capacitor C1, and the control end is connected with the load ground wire through the first resistor R1. Exemplary, the MOS transistor shown in fig. 2 is described as follows:
the grid of the MOS tube is connected with one end of the first isolation capacitor C1 and connected with the first resistor R1, the drain electrode of the MOS tube is connected with the load trigger end, the load trigger end is provided with a self-adaptive pull-up potential, and the source electrode of the MOS tube is connected with a load ground wire. In this embodiment, an NPN type MOS transistor may be used.
When the pulse signal is in a high level Vih, the first isolation capacitor C1 outputs a trigger signal with the voltage Vih at the moment that the input signal jumps from 0V to Vih, and after the trigger signal is loaded to the grid electrode of the NPN type MOS tube, the NPN type MOS tube is turned off, and the drain electrode outputs a level signal with the self-adaptive pull-up potential to drive a load.
When the pulse signal is at a low level, the first isolation capacitor C1 outputs a-Vih trigger signal with a voltage of 0V at the moment that the input signal jumps from Vih to 0V, or outputs 0V, and after the input signal is loaded to the grid electrode of the NPN type MOS tube, the NPN type MOS tube is conducted, the drain electrode is grounded through the source electrode, and a low level signal is output.
In this embodiment, when the pulse signal is in the high level Vih, the first isolation capacitor C1 outputs a trigger signal with voltage Vih at the moment when the input signal jumps from 0V to Vih, after the trigger signal is loaded to the gate of the PNP type MOS transistor, the PNP type MOS transistor is turned on, and the drain is grounded through the source, so as to output a low level signal.
When the pulse signal is in a low level, the first isolation capacitor C1 outputs a-Vih trigger signal with a voltage of 0V at the moment when the input signal Vih is changed from a jump state to a state of 0V, or outputs 0V, the PNP type MOS tube is turned off after the input signal Vih is loaded to the grid electrode of the PNP type MOS tube, and the drain electrode output load trigger end is provided with a level signal driving load with a self-adaptive pull-up potential.
In this embodiment, in order to reduce the capacitance reactance of the first isolation capacitor C1 and the second isolation capacitor C2 to reduce the loss of the switching signal, the capacitor may adopt a capacitor with a larger capacitance value. In order to ensure that the signal received by the control end of the control switch Q1 is consistent with the pulse signal as much as possible, in this embodiment, the time constant between the series capacitance of the first isolation capacitor C1 and the second isolation capacitor C2 and the first resistor R1 is N times the duration of the low level of the pulse signal, where N is greater than 1. For example, the time constant of the RC circuit formed by the series capacitor and the first resistor R1 is t=rc, where R is the resistance of the first resistor R1, and C is the capacitance of the series capacitor. For the first isolation capacitor C1, the second isolation capacitor C2 and the first resistor R1 may be selected such that T is substantially greater than T, where T is the duration of the low level of the pulse signal. As shown in fig. 3, the signal B output by the capacitive isolation module is basically consistent with the period, waveform and amplitude of the pulse signal a, so as to accurately trigger the control switch Q1.
As another exemplary embodiment, in order to better adapt to the high-frequency pulse signal, in this embodiment, a capacitor with a small capacitance value may also be used when selecting the first isolation capacitor C1 and the second isolation capacitor C2. In the present embodiment, the time constant between the series capacitance of the first isolation capacitor C1 and the second isolation capacitor C2 and the first resistor R1 is much longer than the duration of the low level of the pulse signal, so as to have better high-frequency trafficability. In this embodiment, a small capacitor is used for isolation, and the capacitor isolation module outputs a spike, so that the spike needs to be restored to the waveform and amplitude of the pulse signal.
By way of example, this may be achieved using a pulse triggered latching circuit. The pulse triggering self-locking circuit is connected between the capacitance isolation module and the amplifying circuit. In this embodiment, the pulse triggering self-locking circuit may employ a clocked flip-flop, for example, a D flip-flop, a synchronous RS flip-flop, or a T flip-flop. In this embodiment, a D flip-flop is taken as an example.
In this embodiment, when a capacitor with a small capacitance value is used for isolation, a pulse signal output by the capacitance isolation module is a spike pulse signal, as shown in fig. 4, when the pulse signal is a waveform a, and when the rising edge of the pulse signal arrives, the voltage of the first isolation capacitor C1 cannot be suddenly changed, the voltage of the first isolation capacitor C1 is pulled up to Vih, the first resistor R1 provides a signal loop, the first isolation capacitor C1 starts to be charged, and the time constant is far smaller than the period of the pulse signal due to the small capacitance value. Therefore, the first isolation capacitor C1 is fully charged rapidly, and at the moment, the voltage drop at the two ends of the first isolation capacitor C1 becomes 0V; when the falling edge of the pulse signal arrives, the voltage of the first isolation capacitor C1 can not be suddenly changed, the voltage of the first isolation capacitor C1 is pulled to-Vih, the first resistor R1 provides a signal loop, the first isolation capacitor C1 begins to discharge, and the time constant is far smaller than the pulse signal period due to the small capacitance value. Therefore, the first isolation capacitor C1 is rapidly discharged, and at this time, the voltage drop across the first isolation capacitor C1 becomes 0V. A waveform b appears as shown in fig. 4.
In this embodiment, a rectifying module is further disposed between the capacitor isolation module and the pulse triggering self-locking circuit, for example, full-bridge rectification may be adopted to rectify the waveform b into the waveform c, and then the waveform c passes through the pulse triggering self-locking circuit, and the pulse rising edge triggers the pulse triggering self-locking circuit to invert, so as to output the waveform d, thereby realizing the recovery of the pulse signal.
As an exemplary embodiment, when the capacitance isolation module 20 selects a capacitance with a large capacitance value, the capacitance resistance is small, the low-frequency signal passing ability is high, the high-frequency pulse signal passing ability is poor, and when the capacitance with a small capacitance value is selected, the high-frequency signal passing ability is high, the low-frequency signal passing ability is poor, and the capacitance resistance is large, so that when the frequency of the pulse signal is not constant, no matter which capacitance value is selected, the loss of the pulse signal may occur, and in severe cases, the first driving module 30 may not be triggered. In this embodiment, a capacitor with a small capacitance value can be selected as the capacitor isolation module, and the optical coupler isolation module is used as an alternative circuit, so that the advantages of the capacitor isolation module and the optical coupler isolation module can be fully utilized. The optical coupler isolation module is not required to be in a working state for a long time, so that the isolation of pulse signals in a wider range is realized under the condition of guaranteeing the service life.
Referring specifically to fig. 5, the isolation circuit further includes a second driving module 40 and an optocoupler isolation module 50, where an input end of the optocoupler isolation module 50 is connected to the input module 10, and an output end of the optocoupler isolation module 50 is connected to the second driving module 40 through an inverter U2, where the level states of trigger signals of the first driving module 30 and the second driving module 40 are opposite.
In addition, an isolation selecting module 60 is disposed between the optocoupler isolation module 50 and the capacitor isolation module 20, and is configured to select the optocoupler isolation module 50 to enable or the capacitor isolation module 20 to enable according to the signal synchronization state between the pulse signal generating end and the input ends of the first driving module 30 and the second driving module 40.
As shown in fig. 5, a signal synchronization state detection circuit is further provided between the pulse signal generating terminal and the input terminal of the driving module, and the output terminal of the synchronization state detection circuit is connected to the isolation selection module 60.
The synchronization state detection circuit may include a first type control switch Q2, a second type control switch Q3, and an exclusive or gate U1, wherein the first type control switch Q2 and the second type control switch Q3 are different in type. In this embodiment, the first type control switch Q2 may be an NPN type transistor, and the second type control switch Q3 may be a PNP type transistor; or the first type control switch Q2 may be a PNP type transistor and the second type control switch Q3 may be an NPN type transistor. In this embodiment, the first type control switch Q2 is an NPN type transistor, and the second type control switch Q3 is a PNP type transistor, for example:
the first type control switch Q2 is connected in series in the capacitive isolation module 20, the second type control switch Q3 is connected in series in the optocoupler isolation module 50, the control end of the first type control switch Q2 and the control end of the second type control switch Q3 are connected with the output end of the exclusive or gate U1, the first end of the exclusive or gate U1 is connected with the pulse signal generating end, and the second end of the exclusive or gate U1 is connected with the input end of the first driving module 30 and the input end of the second driving module 40 respectively. Referring to fig. 5, a photo coupler U3 is connected in series with the input of the first driving module 30 and the input of the second driving module 40 at the second end of the exclusive or gate U1. The input end of the photocoupler U3 is connected between the input ends of the first driving module 30 and the second driving module 40 and the load end ground line, and the output end of the photocoupler U3 is connected between the second end of the exclusive or gate U1 and the pulse signal ground line, so as to isolate the load end from the pulse signal generating end.
The working principle of the synchronous state detection circuit is described below with reference to fig. 5:
referring to the above embodiment, for example, when the capacitive isolation module 20 participates in signal isolation at the current moment and the pulse signal is at a high level, if the capacitive isolation module 20 is working normally, the voltage of the trigger signal outputted by the capacitive isolation module 20 for triggering the first driving module 30 is substantially consistent with the voltage of the pulse signal, the first end and the second end of the exclusive-or gate U1 are both inputted with the high level, the exclusive-or gate U1 outputs the low level, the first type control switch Q2 is kept in a conductive state, the second type control switch Q3 is kept in a non-conductive state, and the capacitive isolation module 20 is kept participating in signal isolation.
When the pulse signal is at low level, if the isolation circuit works normally, the input end of the first driving module 30 is at low level, the first end and the second end of the exclusive-or gate U1 input low level at the same time, the exclusive-or gate U1 outputs low level, the first type control switch Q2 keeps on state, the second type control switch Q3 keeps off state, and the capacitance isolation module 20 keeps participating in signal isolation.
If the capacitance isolation module 20 is insufficient in output capability of the capacitance isolation module 20 due to frequency variation of the pulse signal, the pulse signal generating end may output a high level, and the voltage of the signal input by the first driving module 30 is greatly different from the voltage of the signal output by the pulse signal generating end, at this time, the voltage of the signal input by the first end of the exclusive-or gate U1 is higher than the voltage of the signal input by the second end, which is equivalent to inputting signals with different levels at two ends of the exclusive-or gate U1, the exclusive-or gate U1 outputs a high level, the first type control switch Q2 is turned off, the second type control switch Q3 is turned on, and at this time, the switching to the optical coupling isolation module 50 participates in pulse signal isolation.
When the optocoupler isolation module 50 participates in signal isolation and the pulse signal is at a high level, if the optocoupler isolation module 50 works normally, the trigger signal output by the optocoupler isolation module 50 for triggering the second driving module 40 changes to a low level through the inverter U2 (the second driving module 40 may include a PNP transistor), the voltage of the signal input by the first end of the xor gate U1 is higher than the voltage of the signal input by the second end, the xor gate U1 outputs a high level, the first type control switch Q2 remains turned off, the second type control switch Q3 remains turned on, and the optocoupler isolation module 50 remains participating in signal isolation;
when the pulse signal is at a low level, if the optocoupler isolation module 50 works normally, the input end of the second driving module 40 is at a high level after passing through the inverter U2, the first end of the exclusive-or gate U1 inputs the low level, the second end inputs the high level, the exclusive-or gate U1 outputs the high level, the first type control switch Q2 keeps the off state, the second type control switch Q3 keeps the on-state, and the optocoupler isolation module 50 keeps participating in signal isolation.
If the output capability of the optocoupler isolation module 50 is insufficient due to the frequency change or other effects of the pulse signal, the output of the pulse signal generating end may occur, the optocoupler isolation module 50 outputs a low-level signal, the second driving module 40 inputs a high-level signal, the two ends of the exclusive or gate U1 input high-level signals, the exclusive or gate U1 outputs a low-level signal, the first type control switch Q2 is turned on, the second type control switch Q3 is turned off, and the capacitor isolation module 20 is switched to participate in pulse signal isolation.
As an alternative embodiment, the first type control switch Q2 is a PNP type transistor, the second type control switch Q3 is an NPN type transistor, and the corresponding exclusive or gate U1 is changed to an exclusive or gate, so that the automatic selection of the isolation circuit can be similarly implemented.
As an exemplary embodiment, referring to fig. 5, the second isolation capacitor C2 isolates the ground potentials at two sides during the period of the optical coupling isolation module participating in signal isolation and the period of the capacitive isolation module participating in signal isolation, so as to ensure that the ground potentials at two sides are in an isolated state in real time, and further ensure that the ground potential fluctuation at the pulse signal generating end does not affect the working state and the equipment safety at the load end.
As an alternative embodiment, the input module 10 further includes a second resistor R2, and the second resistor R2 is connected between the pulse signal generating terminal and the pulse signal ground for simulating a resistive load. When the pulse signal is input to the input module 10, the second resistor R2 converts the pulse signal into a resistive signal, and then transmits the resistive signal to the capacitive isolation module 20 or the optocoupler isolation module 50.
As an alternative embodiment, as shown in fig. 6, a third resistor R3 is connected in series to the input end of the first driving module 30 or the second driving module 40 (not shown in the figure) and is used for matching the first driving module 30 or the second driving module 40, so as to prevent the coupled peak from false triggering of the first driving module 30 or the second driving module 40. As another exemplary embodiment, when the first driving module 30 and the second driving module 40 are MOS transistors, the third resistor R3 is connected in series with the second resistor R2 of the input module 10 or connected in series with the first resistor R1, and is used as a bleeder resistor of the gate-source capacitance of the MOS transistors to serve as a matching function for the first driving module 30 or the second driving module 40.
The embodiment of the application also provides a fusion shooting device, which comprises: an isolation circuit of any of the above embodiments that photographs a trigger terminal and a pulse signal generating terminal; the isolation circuit is connected between the shooting trigger end and the pulse signal input end. The exemplary embodiment of the shooting trigger section can be a fusion device or other equipment trigger. In this embodiment, the fusion shooting device may be a high-speed camera or a high-speed video capturing device, which is used for shooting the fusion process.
Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, etc.
The non-mentioned places in the application can be realized by adopting or referring to the prior art.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (9)
1. An isolation circuit, comprising:
the input module is used for connecting the pulse signal generating end and the pulse signal ground wire;
the first driving module is used for being connected with the load triggering end;
the capacitor isolation module is arranged between the input module and the first driving module and comprises a first isolation capacitor, a second isolation capacitor and a protection unit, wherein the first isolation capacitor is connected in series with the pulse signal generation end; the second isolation capacitor and the protection unit are connected in series on the pulse signal ground wire and used for isolating the ground potential between the pulse signal generation end and the load;
the device comprises a first driving module, an input module, an output module, a first inverter, a second driving module, an optical coupler isolation module, a first switching circuit, a second switching circuit and a first switching circuit, wherein the input end of the optical coupler isolation module is connected with the input module, the output end of the optical coupler isolation module is connected with the first driving module through the inverter, and the level states of trigger signals of the first driving module and the second driving module are opposite;
and an isolation selection module is arranged between the optocoupler isolation module and the capacitance isolation module and is used for selecting the optocoupler isolation module to enable or the capacitance isolation module to enable according to the signal synchronization states of the pulse signal generation end and the input ends of the first driving module and the second driving module.
2. The isolation circuit of claim 1, wherein the protection unit comprises: an over-current protection unit and/or an over-voltage protection unit.
3. The isolation circuit of claim 1, wherein the first drive module comprises:
the control switch is connected between the load trigger end and the load ground wire, and the control end of the control switch is connected with the first isolation capacitor and is connected with the load ground wire through a first resistor.
4. The isolation circuit of claim 3, wherein a time constant of a series capacitance of said first isolation capacitance and said second isolation capacitance with said first resistance is N times a low level duration of said pulse signal, wherein N is greater than 1.
5. The isolation circuit of claim 3, wherein a time constant of a series capacitance of said first isolation capacitance and said second isolation capacitance with said first resistance is less than a low level duration of said pulse signal; the first driving module further includes: the pulse triggering self-locking circuit is connected between the capacitive isolation module and the control end of the control switch and is used for restoring the pulse signal output by the capacitive isolation module.
6. The isolation circuit of claim 1, wherein a signal synchronization state detection circuit is further provided between the pulse signal generating terminal and the driving module input terminal, and an output terminal of the synchronization state detection circuit is connected to the isolation selection module.
7. The isolation circuit of claim 1, wherein the input module further comprises a second resistor connected between the pulse signal generating terminal and a pulse signal ground for simulating a resistive load.
8. The isolation circuit of claim 1, wherein a third resistor is further connected in series at an input of the drive module.
9. A fusion shooting device, characterized by comprising: a shooting trigger terminal and a pulse signal generation terminal, and an isolation circuit according to any one of claims 1 to 8; wherein the method comprises the steps of
The isolation circuit is connected between the shooting trigger end and the pulse signal input end.
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| CN202310685430.0A CN116800246B (en) | 2023-06-09 | 2023-06-09 | Isolation circuit and fusion shooting device |
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