CN107966604B - Peak voltage trigger capture circuit and system - Google Patents
Peak voltage trigger capture circuit and system Download PDFInfo
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- CN107966604B CN107966604B CN201711168353.2A CN201711168353A CN107966604B CN 107966604 B CN107966604 B CN 107966604B CN 201711168353 A CN201711168353 A CN 201711168353A CN 107966604 B CN107966604 B CN 107966604B
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Abstract
The invention relates to a peak voltage trigger capture circuit and a system. The circuit comprises an analog switch module and a pulse trigger module, wherein the pulse trigger module comprises a square wave trigger module and a monostable trigger module; the input end of the analog switch module is used for being connected with a test receiving device, the first output end of the analog switch module is connected with the input end of the square wave trigger module, and the second output end of the analog switch module is connected with the first input end of the monostable trigger module; the output end of the square wave trigger module is connected with the second input end of the monostable trigger module; and the output end of the monostable trigger module is used for connecting an oscilloscope. When the peak voltage trigger capture circuit detects that the peak voltage caused by the switching value appears in the tested equipment loop, the high and low levels are alternately output to the oscilloscope, and the oscilloscope captures the peak voltage of the tested equipment loop according to the high and low levels, so that the capture probability of the peak voltage is greatly improved.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a peak voltage trigger capture circuit and system.
Background
Military equipment and subsystems have been focused on the resulting peak voltage testing due to the nature of the power supply system.
Conventionally, the CE107 is a spike test item mainly generated by the power line of the onboard equipment of naval, army, air force and airplane. When each large laboratory carries out the CE107 test, the manual operation is basically adopted, and the oscilloscope triggers the method for grabbing the spike voltage waveform. Because the peak voltage difference generated every time and the information such as phase, amplitude, pulse width and the like superposed on the alternating current waveform are different, great trouble is generated on the trigger setting of the oscilloscope tested at the time, and the peak voltage generated at the corresponding moment can not be accurately captured during measurement.
In summary, when the CE107 peak voltage conducted emission test is performed, due to its own characteristics, the oscilloscope cannot accurately and effectively trigger and capture the peak voltage when a transient small signal is superimposed on an ac large signal.
Disclosure of Invention
Therefore, it is necessary to provide a spike voltage trigger capture circuit and system for solving the problem that when a transient small signal is superimposed on an ac large signal during an emc CE107 spike voltage conducted emission test, the spike voltage cannot be triggered and captured accurately and effectively.
A spike voltage trigger capture circuit, comprising:
the pulse trigger module comprises a square wave trigger module and a monostable trigger module;
the input end of the analog switch module is used for being connected with a test receiving device, the first output end of the analog switch module is connected with the input end of the square wave trigger module, and the second output end of the analog switch module is connected with the first input end of the monostable trigger module; the output end of the square wave trigger module is connected with the second input end of the monostable trigger module; the output end of the monostable trigger module is connected with an oscilloscope;
the analog switch module is used for detecting whether a peak voltage caused by switching value occurs in a tested equipment loop, and if so, a first voltage signal and a second voltage signal are respectively output to the square wave trigger module and the monostable trigger module; the first voltage signal is used for electrifying the square wave trigger module, and the square wave trigger module outputs a square wave signal to the monostable trigger module after being electrified; the monostable trigger module alternately outputs high and low levels to an oscilloscope under the action of the square wave signal and the second voltage signal so as to trigger the oscilloscope to capture the peak voltage of the tested equipment loop;
the period of the square wave signal is the same as that of the alternating current accessed by the tested equipment.
In one embodiment, the analog switch module comprises: the voltage detection circuit, the first voltage stabilizing circuit, the second voltage stabilizing circuit and the voltage comparison circuit; the input end of the voltage detection circuit is used for being connected with a test device, and the output end of the voltage detection circuit is connected with the input end of the first voltage stabilizing circuit and the input end of the second voltage stabilizing circuit; the output end of the second voltage stabilizing circuit is connected with the first input end of the monostable trigger module; the output end of the first voltage stabilizing circuit is connected with one input end of the voltage comparison circuit, and the other input end of the voltage comparison circuit is grounded; the output end of the voltage comparison circuit is connected with the input end of the square wave trigger module;
the voltage detection circuit is used for detecting whether peak voltage caused by switching value occurs in a tested equipment loop, if so, a first voltage signal is output to the square wave trigger module through the voltage comparison circuit, and a second voltage signal is output to the monostable trigger module through the second voltage stabilizing circuit.
In one embodiment, the voltage detection circuit comprises a transformer and a rectifier bridge, wherein the input end of the transformer is used for being connected with a piece of test equipment, the output end of the transformer is connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with the input end of the first voltage stabilizing circuit and the input end of the second voltage stabilizing circuit; the rectifier bridge rectifies the alternating current voltage output by the transformer into direct current and outputs the direct current.
In one embodiment, the first voltage stabilizing circuit comprises a first capacitor, a second capacitor and a three-terminal voltage stabilizing integrated circuit; the first end and the second end of the three-end voltage-stabilizing integrated circuit are respectively connected with the two ends of the first capacitor; the second end and the third end of the three-end voltage-stabilizing integrated circuit are respectively connected with two ends of the second capacitor; the first end of the three-end voltage-stabilizing integrated circuit is connected with the output end of the rectifier bridge, the third end of the three-end voltage-stabilizing integrated circuit is connected with one input end of the voltage comparison circuit, and the second end of the three-end voltage-stabilizing integrated circuit is grounded;
the first capacitor is used for filtering the output voltage of the rectifier bridge; the second capacitor is used for filtering the output voltage of the three-terminal voltage-stabilizing integrated circuit.
In one embodiment, the square wave trigger module comprises: an operational amplifier circuit and an RC charge and discharge circuit; the input end of the RC charge-discharge circuit is connected with the output end of the operational amplification circuit, and the output end of the RC charge-discharge circuit is connected with the first input end of the operational amplification circuit; the second input end of the operational amplification circuit is connected with the steady-state voltage, and the third input end of the operational amplification circuit is connected with the first output end of the analog switch module;
the RC charge-discharge circuit is charged and discharged alternately, the first input end and the second input end of the operational amplification circuit are controlled to be changed into a high-level state alternately, and the output end of the operational amplifier outputs a square wave signal.
In one embodiment, the charge and discharge circuit includes: the circuit comprises a first diode, a second diode, a first resistor, a second resistor and a capacitor; one end of the first resistor is connected with the cathode of the first diode; one end of the second resistor is connected with the anode of the second diode; the other end of the first resistor and the other end of the second resistor are both connected with the output end of the operational amplification circuit; one end of the capacitor is connected with the anode of the first diode and the cathode of the second diode, and the other end of the capacitor is grounded.
In one embodiment, the monostable trigger module includes: the circuit breaker comprises a circuit breaking control circuit, a first follower circuit, a second follower circuit, a first NAND circuit and a second NAND circuit; one input end of the circuit breaking control circuit is connected with the output end of the square wave trigger module, the other input end of the circuit breaking control circuit is grounded, and a first output end and a second output end of the circuit breaking control circuit are respectively connected with a first input end of the first NAND circuit and a first input end of the second NAND circuit; one end of the first following circuit and one end of the second following circuit are both connected with the second output end of the analog switch module; the other end of the first follower circuit and the other end of the second follower circuit are respectively connected with a first input end of the first NAND circuit and a first input end of the second NAND circuit; the second input end of the first NAND circuit is connected with the output end of the second NAND circuit; the second input end of the second NAND circuit is connected with the output end of the first NAND circuit; the output end of the first NAND circuit is connected with the oscilloscope;
when the voltage of one input end of the circuit breaking control circuit is larger than a preset voltage threshold, the first following circuit is conducted, the second following circuit is not conducted, and the first NAND circuit outputs high potential; when the voltage of one input end of the circuit breaking control circuit is not larger than a preset voltage threshold value, the first following circuit is not conducted, the second following circuit is conducted, and the first NAND circuit outputs a low potential.
In one embodiment, the short circuit control circuit comprises a relay; one input end of the relay is connected with the output end of the square wave trigger module, and the other input end of the relay is grounded; the relay comprises a first contact, a second contact and a third contact; the first contact is grounded, the second contact is connected with a first input end of the first NAND circuit, and the third contact is connected with a first input end of the second NAND circuit;
when the voltage of one input end of the relay is larger than a preset voltage threshold value, the relay is conducted, and the first contact is connected with the second contact; when the voltage of one input end of the relay is not larger than a preset voltage threshold value, the relay is not conducted, and the first contact is connected with the third contact.
In one embodiment, the monostable trigger module further comprises a triode amplifying circuit; the triode amplifying circuit is used for amplifying the output voltage of the first NAND circuit, and the output end of the triode amplifying circuit is used for being connected with an oscilloscope.
A kind of peak voltage triggers the catching system, including oscilloscope, the above-mentioned peak voltage triggers the catching circuit; and when the peak voltage trigger capture circuit detects that the peak voltage caused by the switching value occurs in the tested equipment loop, alternately outputting high and low levels to the oscilloscope, and capturing the peak voltage of the tested equipment loop by the oscilloscope according to the high and low levels.
According to the technical scheme, when the peak voltage caused by the switching value of the tested equipment loop is detected, the square wave trigger module and the monostable trigger module respectively output a first voltage signal and a second voltage signal; the first voltage signal is used for electrifying the square wave trigger module, and the square wave trigger module outputs a square wave signal to the monostable trigger module after being electrified; and the monostable trigger module alternately outputs high and low levels to the oscilloscope under the action of the square wave signal and the second voltage signal so as to trigger the oscilloscope to capture the peak voltage of the tested equipment loop. The consistency between the instant of electrifying the tested equipment and the trigger signal of the oscilloscope is ensured, and the capture probability of the peak voltage is greatly improved.
Drawings
FIG. 1 is a block diagram illustrating the operation of an embodiment of a spike trigger capture circuit;
FIG. 2 is a circuit schematic of an analog switch module of an embodiment;
FIG. 3 is a schematic circuit diagram of an embodiment of a square wave trigger module;
FIG. 4 is a circuit schematic of a monostable trigger module of an embodiment;
FIG. 5 is a circuit schematic of a spike voltage trigger capture circuit of an embodiment;
FIG. 6 is a diagram illustrating the effect of capturing spike voltages according to an embodiment;
FIG. 7 is a block diagram illustrating the operation of the spike trigger capture system according to one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a block diagram illustrating the operation of a spike voltage trigger capture circuit according to an embodiment, as shown in fig. 1, the spike voltage trigger capture circuit includes an analog switch module 102 and a pulse trigger module 103, and the pulse trigger module 103 includes a square wave trigger module 104 and a monostable trigger module 105.
The input end of the analog switch module 102 is used for connecting to the test equipment 101, the first output end of the analog switch module 102 is connected to the input end of the square wave trigger module 104, and the second output end of the analog switch module 102 is connected to the first input end of the monostable trigger module 105; the output end of the square wave trigger module 104 is connected with the second input end of the monostable trigger module 105; the output end of the monostable trigger module 105 is used for connecting an oscilloscope 106.
The oscilloscope 106 is an electronic measuring instrument, and can trace the change curve of the instantaneous value of the measured signal on the screen under the action of the measured signal. The oscillograph can be used to observe the waveform curve of different signal amplitudes varying with time, and it can also be used to test different electric quantities, such as voltage, current, frequency, phase difference and amplitude regulation. In the following embodiments, the oscilloscope is mainly used to test the voltage spike of the tested device loop.
The analog switch module 102 is configured to detect whether a peak voltage caused by a switching value occurs in a loop of the device under test 101, and if so, output a first voltage signal and a second voltage signal for the square wave trigger module 104 and the monostable trigger module 105, respectively; the first voltage signal is used for powering on the square wave trigger module 104, and the square wave trigger module 104 outputs a square wave signal to the monostable trigger module 105 after being powered on; the monostable trigger module 105 alternately outputs high and low levels to the oscilloscope 106 under the action of the square wave signal and the second voltage signal to trigger the oscilloscope 106 to capture the spike voltage of the loop of the device under test 101.
Wherein, the switching value refers to the on or off of the tested equipment; load surges are also possible. The period of the square wave signal is the same as that of alternating current accessed by the tested equipment, so that the consistency of the time of triggering the oscilloscope by the high and low levels and the power-on moment of the tested equipment is ensured, and the success probability of testing and capturing the peak voltage is greatly improved.
In the above embodiment, when it is detected that the peak voltage caused by the switching value occurs in the device under test loop 101, the square wave trigger module 104 and the monostable trigger module 105 output the first voltage signal and the second voltage signal, respectively; the first voltage signal is used for powering on the square wave trigger module 104, and the square wave trigger module 104 outputs a square wave signal to the monostable trigger module 105 after being powered on; the monostable trigger module 105 alternately outputs high and low levels to the oscilloscope 106 under the action of the square wave signal and the second voltage signal to trigger the oscilloscope 106 to capture the spike voltage of the loop of the device under test 101. The consistency between the instant of electrifying the tested equipment 101 and the trigger signal of the oscilloscope is ensured, and the capture probability of the peak voltage is greatly improved.
Fig. 2 is a schematic circuit diagram of an analog switch module according to an embodiment.
As shown in fig. 2, the analog switch module 102 includes: a voltage detection circuit 20, a first regulator circuit 211, a second regulator circuit 212, and a voltage comparison circuit 22; the input end of the voltage detection circuit 20 is used for connecting the test equipment 101, and the output end of the voltage detection circuit 20 is connected with the input end of the first voltage stabilizing circuit 211 and the input end of the second voltage stabilizing circuit 212; the output end V3 of the second voltage stabilizing circuit 212 is connected with a first input end of the monostable trigger module 105; the output end of the first voltage stabilizing circuit 211 is connected to one input end of the voltage comparing circuit 22, and the other input end of the voltage comparing circuit 22 is grounded; the output terminal V2 of the voltage comparison circuit 22 is connected to the input terminal of the square wave trigger module 104.
The voltage detection circuit 20 is configured to detect whether a peak voltage caused by a switching value occurs in a loop of the device under test 101, and if so, the voltage comparison circuit 22 outputs a first voltage signal V2 to the square wave trigger module 104, and the second voltage stabilizing circuit outputs a second voltage signal V3 to the monostable trigger module 105.
In one embodiment, the voltage detection circuit 20 includes a transformer T1, a rectifier bridge D1; the rectifier bridge D1 is composed of 4 diodes. The input end of the transformer T1 is used for being connected with the test equipment 101, the output end of the transformer T1 is connected with the input end of the rectifier bridge D1, and the output end of the rectifier bridge is connected with the input end of the first voltage stabilizing circuit 211 and the input end of the second voltage stabilizing circuit 212; the rectifier bridge D1 rectifies the AC voltage output by the transformer T1 into DC output.
In one embodiment, the first stabilizing circuit 211 comprises a first capacitor C1, a second capacitor C2, and a three-terminal regulator integrated circuit U1; the first end and the second end of the three-terminal voltage-stabilizing integrated circuit U1 are respectively connected with the two ends of the first capacitor C1; the second end and the third end of the three-end voltage-stabilizing integrated circuit U1 are respectively connected with the two ends of the second capacitor C2; the first terminal of the three-terminal regulator integrated circuit U1 is connected to the output terminal of the rectifier bridge D1, the third terminal of the three-terminal regulator integrated circuit U1 is connected to an input terminal of the voltage comparison circuit 22, and the second terminal of the three-terminal regulator integrated circuit U1 is grounded.
The first capacitor C1 is used for filtering the output voltage of the rectifier bridge D1; the second capacitor C2 is used for filtering the output voltage of the three-terminal voltage-stabilizing integrated circuit U1.
In one embodiment, the second stabilizing circuit 212 includes a third capacitor C3, a fourth capacitor C4, and a three-terminal regulator integrated circuit U2; the first end and the second end of the three-end voltage-stabilizing integrated circuit U2 are respectively connected with the two ends of the third capacitor C3; the second end and the third end of the three-end voltage-stabilizing integrated circuit U2 are respectively connected with the two ends of the fourth capacitor C4; the first end of the three-terminal regulator integrated circuit U2 is connected with the output end of the rectifier bridge D1, the third end V3 of the three-terminal regulator integrated circuit U2 is connected with the first input end of the monostable trigger module 105, and the second end of the three-terminal regulator integrated circuit U1 is grounded.
The third capacitor C3 is used for filtering the output voltage of the rectifier bridge D1; the fourth capacitor C4 is used for filtering the output voltage of the three-terminal voltage-stabilizing integrated circuit U2. The second voltage regulating circuit 212 provides a second voltage signal V3 to the monostable trigger module 105.
In one embodiment, the voltage comparison circuit 22 is mainly composed of an operational amplifier a1, and is used for providing a first voltage signal V2 for the square wave trigger module 104, triggering the square wave trigger module 104 to be powered on, so as to output a square wave to the monostable trigger module 105.
Fig. 3 is a schematic circuit diagram of a square wave trigger module according to an embodiment.
As shown in fig. 3, the square wave trigger module 104 includes an operational amplifier circuit 31 and an RC charging and discharging circuit 32; the input end of the RC charging and discharging circuit 32 is connected to the output end of the operational amplifier circuit 31, and the output end of the RC charging and discharging circuit 32 is connected to the first input end of the operational amplifier circuit 31; a second input end of the operational amplifier circuit 31 is connected to the steady-state voltage, and a third input end of the operational amplifier circuit is connected to the first output end V2 of the analog switch module.
The RC charging and discharging circuit 32 alternately charges and discharges to control the first input terminal and the second input terminal of the operational amplifier circuit 31 to alternately change to a high level state, and the output terminal of the operational amplifier circuit 31 outputs a square wave signal V4. Under the action of the square wave signal V4 and the second voltage signal V3, the monostable trigger module 105 is triggered to alternately output high and low levels to the oscilloscope 106, so as to trigger the oscilloscope 106 to capture the spike voltage of the circuit of the device under test.
In one embodiment, the charging and discharging circuit 32 includes: the circuit comprises a first diode D2, a second diode D3, a first resistor R5, a second resistor R6 and a capacitor C5; one end of the first resistor R5 is connected with the cathode of the first diode D2; one end of the second resistor R6 is connected with the anode of the second diode D3; the other end of the first resistor R5 and the other end of the second resistor R6 are both connected with the output end of the operational amplifier circuit 31; one end of the capacitor C5 is connected to the anode of the first diode D2 and the cathode of the second diode D3, and the other end of the capacitor C5 is grounded.
The second input end of the operational amplifier circuit 31 is connected to a steady-state voltage, and the first input end of the operational amplifier circuit 31 is alternately changed to a high level and a low level through the alternate charging and discharging of the RC charging and discharging circuit 32; thereby outputting a square wave signal.
Further, the pulse width and the duty ratio of the square wave signal can be converted by adjusting the capacitor C5 and the peripheral first resistor R5 and the second resistor R6, and this time period is the period of the post-stage monostable trigger module 105 exciting the external trigger port of the oscilloscope 106. Can evaluate the back according to the switching rate scope, adjust the components and parts parameter wantonly, can be when specifically realizing with electric capacity C5, first resistance R5, second resistance R6 all the selection type for adjustable components and parts, trigger cycle and duty cycle transform, if need increase the regulation scope still can carry out parameter adjustment through the parallelly connected mode of different magnitude components and parts. The square wave trigger module 104 provides a single or periodic trigger command to the monostable trigger module, which is mainly determined by the output V2 of the voltage comparison circuit 22 of the analog switch module 104, and is finally determined according to the on/off rate of the device under test.
In one embodiment, the operational amplifier circuit 31 includes an operational amplifier a2, a resistor R2, a resistor R3, and a resistor R4. The second input terminal of the operational amplifier circuit 31 is grounded through a resistor R4, the second input terminal of the operational amplifier circuit 31 is connected to the output terminal of the operational amplifier circuit 31 through a resistor R3, and the second input terminal of the operational amplifier circuit 31 is connected to the first output terminal of the analog switch module 102 through a resistor R2. A first input end of the operational amplifier circuit 31 is connected to an output end of the RC charging and discharging circuit 32. Under the action of the RC charging and discharging circuit 32, the first input terminal of the operational amplifier circuit 31 changes to high and low levels alternately, and under the action of the steady-state voltage at the first input terminal of the operational amplifier circuit 31, a square wave signal is output.
FIG. 4 is a circuit schematic of a monostable trigger block of an embodiment.
As shown in fig. 4, the monostable trigger module 105 opens the control circuit 41, the first follower circuit 42, the second follower circuit 43, the first nand circuit 44, and the second nand circuit 45; one input end of the open circuit control circuit 41 is connected to the output end of the square wave trigger module 104, the other input end of the open circuit control circuit 41 is grounded, and a first output end and a second output end of the open circuit control circuit 41 are respectively connected to a first input end of the first nand circuit 44 and a first input end of the second nand circuit 45; one end of the first follower circuit 42 and one end of the second follower circuit 43 are both connected to the second output end V3 of the analog switch module 102; the other end of the first follower circuit 42 and the other end of the second follower circuit 43 are respectively connected with a first input end of a first nand circuit 44 and a first input end of a second nand circuit 45; a second input terminal of the first nand circuit 44 is connected to an output terminal of the second nand circuit 45; a second input terminal of the second nand circuit 45 is connected to an output terminal of the first nand circuit 44; the output terminal of the first nand circuit 44 is connected to the oscilloscope 106.
When the voltage at one input end of the open-circuit control circuit 41 is greater than a preset voltage threshold, such as zero voltage, the first follower circuit 42 is turned on, the second follower circuit 43 is turned off, and the first nand circuit 44 outputs a high potential; when the voltage at one input end of the open-circuit control circuit 41 is not greater than the preset voltage threshold, the first follower circuit 42 is not turned on, the second follower circuit 43 is turned on, and the first nand circuit 44 outputs a low potential.
In one embodiment, the short circuit control circuit 41 includes a relay S; one input end of the relay S is connected with the output end V4 of the square wave trigger module 104, and the other input end of the relay S is grounded; the relay S comprises a first contact, a second contact and a third contact; the first contact is connected to ground, the second contact is connected to a first input terminal of the first nand circuit 44, and the third contact is connected to a first input terminal of the second nand circuit 45.
When the voltage of one input end of the relay S is larger than a preset voltage threshold value, the relay S is conducted, and the first contact is connected with the second contact; i.e. the first follower circuit 42 is conductive and the second follower circuit 43 is non-conductive. When the voltage of an input end of the relay S is not greater than the preset voltage threshold, the relay S is not turned on, the first contact is connected to the third contact, that is, the first follower circuit 42 is not turned on, and the second follower circuit 43 is turned on.
In one embodiment, the first follower circuit 42 includes a resistor R7, a relay S and a voltage V3 to form a complete circuit. The second follower circuit 43 includes a resistor R8, and forms a complete loop with the relay S and the voltage V3. The first nand circuit 44 and the second nand circuit 45 together form a buffer, and when the first input terminal of the first nand circuit 44 is at a low level and the first input terminal of the second nand circuit 45 is at a high level, the first nand circuit 44 outputs a high level; when the first input terminal of the first nand circuit 44 is at a high level and the first input terminal of the second nand circuit 45 is at a low level, the first nand circuit 44 outputs a low level.
When the relay S is turned on, the first contact is connected to the second contact, the first follower circuit 42 is turned on, the second follower circuit 43 is turned off, the first input terminal of the first nand circuit 44 is at a low level, the first input terminal of the second nand circuit 45 is at a high level, the first nand circuit 44 outputs a high level, that is, the second input terminal of the second nand circuit 45 is at a high level, and the second nand circuit 45 outputs a low level, that is, the second input terminal of the first nand circuit 44 is at a low level, so that the first nand circuit 44 outputs a high level. When the relay S is not turned on, the first contact is connected to the third contact, the first follower circuit 42 is not turned on, the second follower circuit 43 is turned on, the first input terminal of the first nand circuit 44 is at a high level, the first input terminal of the second nand circuit 45 is at a low level, the second nand circuit 45 outputs a high level, that is, the second input terminal of the first nand circuit 44 is at a high level, and the first nand circuit 44 outputs a low level, that is, the second input terminal of the second nand circuit 45 is at a low level, so that the second nand circuit 45 outputs a high level.
Further, the monostable trigger module 105 further includes a triode amplifier circuit; the triode amplifier circuit is used for amplifying the output voltage of the first nand circuit 44, and the output end of the triode amplifier circuit is used for connecting an oscilloscope 106.
FIG. 5 is a circuit diagram of a spike voltage trigger capture circuit according to an embodiment.
As shown in fig. 5, the spike voltage trigger capture circuit includes an analog switch module 102, a square wave trigger module 104, and a monostable trigger module 105. The input end of the analog switch module 102 is used for connecting to a test device, a first output end V2 of the analog switch module 102 is connected to the input end of the square wave trigger module 104, and a second output end V3 of the analog switch module 102 is connected to the first input end of the monostable trigger module 105; the output end V4 of the square wave trigger module is connected with the second input end of the monostable trigger module 105; the output end of the monostable trigger module 105 is used for connecting an oscilloscope.
In the above embodiment, the analog switch module 102 is configured to detect whether a peak voltage caused by a switching value occurs in a circuit of the device under test, and if so, output a first voltage signal V2 and a second voltage signal V3 for the square wave trigger module 104 and the monostable trigger module 105, respectively; the first voltage signal V2 is used to power on the square wave trigger module 104, and the square wave trigger module 104 outputs a square wave signal V4 to the monostable trigger module 105 after being powered on; the monostable trigger module 105 alternately outputs high and low levels to the oscilloscope under the action of the square wave signal V4 and the second voltage signal V3 to trigger the oscilloscope to capture the spike voltage of the tested equipment loop. The consistency between the instant of electrifying the tested equipment and the trigger signal of the oscilloscope is ensured, and the capture probability of the peak voltage is greatly improved.
FIG. 6 is a diagram illustrating the effect of capturing the spike voltage according to an embodiment.
As shown in fig. 6, when it is determined that the voltage changes to the true switching value, the analog switch module 102 outputs an excitation pulse to trigger the pulse trigger module 103 to form a monostable trigger signal, so as to perform external triggering on the oscilloscope, which performs single trigger capture at the next time. Synchronous response delay exists from the time when the analog switch module 102 generates excitation to the time when an external trigger signal reaches the oscilloscope, and the synchronous response delay can be controlled in a very short time through circuit design and component characteristic selection, so that the test result is not influenced. If the switching value of the tested equipment is a periodic stable signal, namely the switching level signal of the tested equipment is in a high-low alternating state, the trigger pulse can also be set to be synchronous periodic trigger for continuous capture, and the graph captured by the oscilloscope is observed manually. And when the satisfactory graph is confirmed to be captured, locking the screen of the oscilloscope, and performing screen capture and storage. For single trigger and synchronous cycle trigger, the peak voltage trigger capture circuit can realize automatic trigger so as to capture peak voltage.
FIG. 7 is a block diagram illustrating the operation of the spike trigger capture system according to one embodiment.
As shown in fig. 7, the spike voltage trigger capture system includes an oscilloscope 106 and the spike voltage trigger capture circuit 701 shown in fig. 5. When the peak voltage trigger capture circuit 701 detects that the peak voltage caused by the switching value occurs in the loop of the device under test 101, high and low levels are alternately output to the oscilloscope 106, and the oscilloscope 106 captures the peak voltage of the loop of the device under test 101 according to the high and low levels. The spike voltage trigger capture system can improve the capture probability of the spike voltage.
It should be understood that portions of the present invention may be implemented in hardware, firmware, or a combination thereof. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer 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.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A spike voltage trigger capture circuit is characterized by comprising an analog switch module and a pulse trigger module, wherein the pulse trigger module comprises a square wave trigger module and a monostable trigger module;
the input end of the analog switch module is used for being connected with a test receiving device, the first output end of the analog switch module is connected with the input end of the square wave trigger module, and the second output end of the analog switch module is connected with the first input end of the monostable trigger module; the output end of the square wave trigger module is connected with the second input end of the monostable trigger module; the output end of the monostable trigger module is connected with an oscilloscope;
the analog switch module is used for detecting whether a peak voltage caused by switching value occurs in a tested equipment loop, and if so, a first voltage signal and a second voltage signal are respectively output to the square wave trigger module and the monostable trigger module; the first voltage signal is used for electrifying the square wave trigger module, and the square wave trigger module outputs a square wave signal to the monostable trigger module after being electrified; the monostable trigger module alternately outputs high and low levels to an oscilloscope under the action of the square wave signal and the second voltage signal so as to trigger the oscilloscope to capture the peak voltage of the tested equipment loop;
the period of the square wave signal is the same as that of the alternating current accessed by the tested equipment.
2. The spike voltage trigger capture circuit of claim 1, wherein the analog switch module comprises: the voltage detection circuit, the first voltage stabilizing circuit, the second voltage stabilizing circuit and the voltage comparison circuit; the input end of the voltage detection circuit is used for being connected with a test device, and the output end of the voltage detection circuit is connected with the input end of the first voltage stabilizing circuit and the input end of the second voltage stabilizing circuit; the output end of the second voltage stabilizing circuit is connected with the first input end of the monostable trigger module; the output end of the first voltage stabilizing circuit is connected with one input end of the voltage comparison circuit, and the other input end of the voltage comparison circuit is grounded; the output end of the voltage comparison circuit is connected with the input end of the square wave trigger module;
the voltage detection circuit is used for detecting whether peak voltage caused by switching value occurs in a tested equipment loop, if so, a first voltage signal is output to the square wave trigger module through the voltage comparison circuit, and a second voltage signal is output to the monostable trigger module through the second voltage stabilizing circuit.
3. The circuit according to claim 2, wherein the voltage detection circuit comprises a transformer and a rectifier bridge, an input terminal of the transformer is connected to the test device, an output terminal of the transformer is connected to an input terminal of the rectifier bridge, and an output terminal of the rectifier bridge is connected to an input terminal of the first voltage regulator circuit and an input terminal of the second voltage regulator circuit; the rectifier bridge rectifies the alternating current voltage output by the transformer into direct current and outputs the direct current.
4. The spike voltage trigger capture circuit of claim 3 wherein the first voltage regulation circuit comprises a first capacitor, a second capacitor, and a three terminal regulator integrated circuit; the first end and the second end of the three-end voltage-stabilizing integrated circuit are respectively connected with the two ends of the first capacitor; the second end and the third end of the three-end voltage-stabilizing integrated circuit are respectively connected with two ends of the second capacitor; the first end of the three-end voltage-stabilizing integrated circuit is connected with the output end of the rectifier bridge, the third end of the three-end voltage-stabilizing integrated circuit is connected with one input end of the voltage comparison circuit, and the second end of the three-end voltage-stabilizing integrated circuit is grounded;
the first capacitor is used for filtering the output voltage of the rectifier bridge; the second capacitor is used for filtering the output voltage of the three-terminal voltage-stabilizing integrated circuit.
5. The spike voltage trigger capture circuit of claim 1, wherein the square wave trigger module comprises: an operational amplifier circuit and an RC charge-discharge circuit; the input end of the RC charge-discharge circuit is connected with the output end of the operational amplification circuit, and the output end of the RC charge-discharge circuit is connected with the first input end of the operational amplification circuit; the second input end of the operational amplification circuit is connected with the steady-state voltage, and the third input end of the operational amplification circuit is connected with the first output end of the analog switch module;
the RC charge-discharge circuit is charged and discharged alternately, the first input end of the operational amplification circuit and the second input end of the operational amplification circuit are controlled to be changed into a high-level state alternately, and the output end of the operational amplifier outputs a square wave signal.
6. The spike voltage trigger capture circuit of claim 5, wherein the RC charge and discharge circuit comprises: the circuit comprises a first diode, a second diode, a first resistor, a second resistor and a capacitor; one end of the first resistor is connected with the cathode of the first diode; one end of the second resistor is connected with the anode of the second diode; the other end of the first resistor and the other end of the second resistor are both connected with the output end of the operational amplification circuit; one end of the capacitor is connected with the anode of the first diode and the cathode of the second diode, and the other end of the capacitor is grounded.
7. The spike voltage trigger capture circuit of claim 1, wherein the monostable trigger module comprises: the circuit breaker comprises a circuit breaking control circuit, a first follower circuit, a second follower circuit, a first NAND circuit and a second NAND circuit; one input end of the circuit breaking control circuit is connected with the output end of the square wave trigger module, the other input end of the circuit breaking control circuit is grounded, and a first output end and a second output end of the circuit breaking control circuit are respectively connected with a first input end of the first NAND circuit and a first input end of the second NAND circuit; one end of the first following circuit and one end of the second following circuit are both connected with the second output end of the analog switch module; the other end of the first follower circuit and the other end of the second follower circuit are respectively connected with a first input end of the first NAND circuit and a first input end of the second NAND circuit; the second input end of the first NAND circuit is connected with the output end of the second NAND circuit; the second input end of the second NAND circuit is connected with the output end of the first NAND circuit; the output end of the first NAND circuit is connected with the oscilloscope;
when the voltage of one input end of the circuit breaking control circuit is larger than a preset voltage threshold, the first following circuit is conducted, the second following circuit is not conducted, and the first NAND circuit outputs high potential; when the voltage of one input end of the circuit breaking control circuit is not larger than a preset voltage threshold value, the first following circuit is not conducted, the second following circuit is conducted, and the first NAND circuit outputs a low potential.
8. The spike voltage trigger capture circuit of claim 7, wherein the trip control circuit comprises a relay; one input end of the relay is connected with the output end of the square wave trigger module, and the other input end of the relay is grounded; the relay comprises a first contact, a second contact and a third contact; the first contact is grounded, the second contact is connected with a first input end of the first NAND circuit, and the third contact is connected with a first input end of the second NAND circuit;
when the voltage of one input end of the relay is larger than a preset voltage threshold value, the relay is conducted, and the first contact is connected with the second contact; when the voltage of one input end of the relay is not larger than a preset voltage threshold value, the relay is not conducted, and the first contact is connected with the third contact.
9. The spike voltage trigger capture circuit of claim 7, wherein the monostable trigger module further comprises a triode amplification circuit; the triode amplifying circuit is used for amplifying the output voltage of the first NAND circuit, and the output end of the triode amplifying circuit is used for being connected with an oscilloscope.
10. A spike voltage trigger capture system comprising an oscilloscope, the spike voltage trigger capture circuit of any one of claims 1 to 9; and when the peak voltage trigger capture circuit detects that the peak voltage caused by the switching value occurs in the tested equipment loop, alternately outputting high and low levels to the oscilloscope, and capturing the peak voltage of the tested equipment loop by the oscilloscope according to the high and low levels.
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| CN107966604B true CN107966604B (en) | 2020-05-19 |
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| CN107966604A (en) | 2018-04-27 |
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