CN110350817B - Pulse generating circuit - Google Patents
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- CN110350817B CN110350817B CN201910446945.9A CN201910446945A CN110350817B CN 110350817 B CN110350817 B CN 110350817B CN 201910446945 A CN201910446945 A CN 201910446945A CN 110350817 B CN110350817 B CN 110350817B
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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Abstract
The invention relates to a pulse generating circuit, which is applied to the verification of a partial discharge monitoring system of a switch cabinet, and comprises the following components: the boost module, multivibrator module and quick relay, control switch, diode D6 and electric capacity C1, the multivibrator module is connected with control switch's control end, quick relay's drive coil passes through control switch ground connection, the boost module, quick relay's drive coil and multivibrator module connect the power respectively, the boost module passes through diode D6 and is connected with quick relay's first contact, quick relay's first contact passes through electric capacity C1 ground connection, quick relay's common port is used for outputting pulse signal, multivibrator module converts direct current into pulse signal, drive quick relay's drive coil work with fixed frequency drive, make quick relay's movable contact carry out the switching in order with certain frequency, produce sub-nanosecond level pulse signal, simulate partial discharge, so that partial discharge monitoring system carries out the check-up.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a pulse generating circuit.
Background
The switch cabinet plays the roles of opening and closing, controlling and protecting electric equipment in the process of generating, transmitting electricity, distributing electricity and converting electric energy in an electric power system, and the switch cabinet is used as an important facility for connecting a power grid and an electric power user, so that the safe and stable operation of the switch cabinet has very important significance for improving the reliability of power supply. The switch cabinet still has the problems of different degrees in the aspects of design, manufacture, installation, operation maintenance and the like, so that the hidden danger of insulation breakdown accidents exists when the switch cabinet operates. Therefore, in order to improve the perception of the insulation state of the switch cabinet in the operation process, whether the switch cabinet has a latent insulation defect or not is found in time; the insulation state of the switch cabinet is monitored on line by adopting an ultrahigh frequency and transient ground voltage and an ultrasonic partial discharge monitoring system.
In order to ensure the validity and reliability of monitoring data in the long-term operation process of the partial discharge monitoring system, the performance of a signal processing unit of an ultrahigh frequency and transient voltage and an ultrasonic sensor used by the system needs to be checked regularly. Because the sensor and the signal processing unit of the partial discharge monitoring system of cubical switchboard are in case installed and accomplished, just be not convenient for dismantle many times, because the detection frequency of superfrequency sensing module distributes at 300MHz ~ 1500MHz mostly among the cubical switchboard partial discharge monitoring system, the detection frequency of transient state low-voltage sensing module distributes at 1MHz ~ 100MHz mostly, the detection frequency of ultrasonic sensing module distributes at 10kHz ~ 100kHz mostly, therefore, the staff need dispose different signal sources at each different partial discharge monitoring system of on-the-spot check-up, thereby be not convenient for the user to check-up partial discharge monitoring system, seriously influence the efficiency of on-the-spot check-up.
Disclosure of Invention
Based on this, it is necessary to provide a pulse generating circuit.
A pulse generating circuit applied to the verification of a partial discharge monitoring system of a switch cabinet comprises the following components: the boost circuit comprises a boost module, a multivibrator module, a quick relay LS1, a control switch and a capacitor C1; the input end of the multivibrator module is used for connecting a power supply, the output end of the multivibrator module is connected with the control end of the control switch, the first end of the control switch is connected with the first end of the driving coil of the quick relay LS1, the second end of the control switch is used for grounding, and the second end of the driving coil of the quick relay LS1 is used for connecting the power supply; the input end of the boosting module is used for connecting a power supply, the output end of the boosting module is connected with the anode of the diode D6, the cathode of the diode D6 is connected with the first contact of the quick relay LS1, the first contact of the quick relay LS1 is used for being grounded through the capacitor C1, and the common end of the quick relay LS1 is used for outputting a pulse signal.
In one embodiment, the pulse generating circuit further includes an absorption module, the absorption module includes a capacitor C2, a resistor R1, and a diode D1, an anode of the diode D1 is connected to a first end of the driving coil of the flying relay LS1, and a cathode of the diode D1 is connected to a second end of the driving coil of the flying relay LS1 through the capacitor C2 and the resistor R1, respectively.
In one embodiment, the pulse generating circuit further includes a voltage regulating module, an input terminal of the voltage regulating module is connected to the output terminal of the boosting module, and an output terminal of the voltage regulating module is connected to the anode of the diode D6.
In one embodiment, the voltage regulation module includes an adjustable resistor RP1, a resistor R2, a resistor R3, and an operational amplifier follower U4, a first end of the adjustable resistor RP1 is connected to the output terminal of the boost module through the resistor R2, a second end of the adjustable resistor RP1 is connected to the ground through the resistor R3, a regulation end of the adjustable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier follower U4, and an output terminal of the operational amplifier follower is connected to the anode of the diode D6.
In one embodiment, the pulse generating circuit further comprises a voltage display module, and the voltage display module is connected with the output end of the voltage regulating module.
In one embodiment, the pulse generating circuit further comprises a synchronous output module, the output end of the multivibrator module is further connected with the input end of the synchronous output module, and the output end of the synchronous output module is used for being connected with a trigger device of a partial discharge monitoring system of a switch cabinet.
In one embodiment, the synchronization output module includes: a monostable flip-flop U3, a capacitor C3 and a resistor R4; the input end of the monostable trigger U3 is connected with the output end of the multivibrator module, the external capacitor end of the monostable trigger U3 is connected with the external resistor end of the monostable trigger U3 through the capacitor C3, the external resistor end of the monostable trigger U3 is also used for being connected with a power supply through the resistor R4, and the output end of the monostable trigger U3 is used for being connected with the trigger device of the partial discharge monitoring system of the switch cabinet.
In one embodiment, the multivibrator module includes a multivibrator, a resistor R5 and a capacitor C4, a first input terminal of the multivibrator is connected to a first terminal of the resistor R5, a second terminal of the resistor R5 is connected to the power supply, a second input terminal of the multivibrator is connected to the ground through the capacitor C4, and an output terminal of the multivibrator is connected to a control terminal of the control switch.
In one embodiment, the multivibrator module further includes a voltage regulator D2, a selector switch and at least two first resistors, the selector switch has a common terminal and at least two first contacts, the positive terminal of the voltage regulator D2 is connected to the first terminal of the resistor R5, the positive terminal of the voltage regulator D2 is further connected to the second input terminal of the multivibrator, the negative terminal of the voltage regulator D2 is connected to the common terminal of the selector switch, and each first contact of the selector switch is connected to the first input terminal of the multivibrator module through one of the first resistors.
In one embodiment, the control switch is a transistor Q1, a base of the transistor Q1 is connected to the output terminal of the multivibrator module, an emitter of the transistor Q1 is connected to ground, and a collector of the transistor Q1 is connected to a first end of a driving coil of the fast relay LS 1.
The pulse generating circuit converts direct current into pulse signals by arranging the multivibrator module, drives a driving coil of the rapid relay LS1 to work circularly at a fixed frequency, and enables a movable contact of the rapid relay LS1 to be switched in order at a certain frequency; the boost module is used for raising the voltage of power to through diode D6 after with the electric energy, send to the first contact of rapid relay LS1, because the movable contact of rapid relay LS1 switches with certain frequency in order, so that electric capacity C1 carries out orderly charge-discharge, produces subnanosecond pulse signal, the signal of analog switch cabinet partial discharge, so that the partial discharge monitoring system carries out the verification.
Drawings
FIG. 1 is a circuit schematic of a pulse generation circuit in one embodiment;
FIG. 2 is a circuit schematic of a high speed relay LS1 in one embodiment;
FIG. 3 is a circuit schematic of a boost module in one embodiment;
FIG. 4 is a circuit schematic of a multivibrator module in one embodiment;
FIG. 5 is a circuit schematic of a synchronous output module in one embodiment;
FIG. 6 is a circuit schematic of a voltage regulation module in one embodiment;
FIG. 7 is a circuit schematic of the power supply circuit and charging protection of the battery module in one embodiment;
FIG. 8 is a circuit schematic of the brown-out indication module in one embodiment;
fig. 9 is a single pulse waveform of a sub-nanosecond pulse signal output from the pulse generating circuit in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, a pulse generation circuit is provided, which is applied to the verification of a partial discharge monitoring system of a switch cabinet, and comprises: the circuit comprises a boosting module, a multivibrator module, a quick relay LS1, a control switch and a capacitor C1, wherein the input end of the multivibrator module is used for being connected with a power supply, the output end of the multivibrator module is connected with the control end of the control switch, the first end of the control switch is connected with the first end of a driving coil of the quick relay LS1, the second end of the control switch is used for being grounded, and the second end of the driving coil of the quick relay LS1 is used for being connected with the power supply; the input end of the boosting module is used for connecting a power supply, the output end of the boosting module is connected with the anode of the diode D6, the cathode of the diode D6 is connected with the first contact of the quick relay LS1, the first contact of the quick relay LS1 is used for being grounded through the capacitor C1, and the common end of the quick relay LS1 is used for outputting a pulse signal.
The pulse generating circuit converts direct current into pulse signals by arranging the multivibrator module, drives a driving coil of the rapid relay LS1 to work circularly at a fixed frequency, and enables a movable contact of the rapid relay LS1 to be switched in order at a certain frequency; the boost module is used for raising the voltage of power to send the electric energy to the first contact of quick relay LS1 behind diode D6, because quick relay LS 1's movable contact switches with certain frequency in order, so that electric capacity C1 carries out orderly charge-discharge, produce subnanosecond pulse signal, the signal of analog switch cabinet partial discharge, so that partial discharge monitoring system verifies, and subnanosecond pulse signal is applicable to the check-up of superfrequency, transient state low voltage and ultrasonic wave partial discharge monitoring system.
In one embodiment, referring to fig. 1, a pulse generating circuit 10 is provided, which is applied to a verification of a partial discharge monitoring system of a switch cabinet, where the pulse generating circuit 10 includes: the boost module 100, the multivibrator module 200, the fast relay LS1, the control switch and the capacitor C1; the input end of the multivibrator module 200 is used for connecting a power supply, the output end of the multivibrator module 200 is connected to the control end of the control switch 300, the first end of the control switch 300 is connected to the first end of the driving coil of the fast relay LS1, the second end of the control switch 300 is used for grounding, and the second end of the driving coil of the fast relay LS1 is used for connecting the power supply; the input end of the boosting module 100 is used for connecting a power supply, the output end of the boosting module 100 is connected with the anode of the diode D6, the cathode of the diode D6 is connected with the first contact of the quick relay LS1, the first contact of the quick relay LS1 is used for being grounded through the capacitor C1, and the common end of the quick relay LS1 is used for outputting a pulse signal.
The boost module is a circuit module capable of boosting a voltage value to a certain value, and specifically, the voltage value of direct current is boosted to a certain value, in this embodiment, the boost module is used for boosting the voltage of a power supply to 100V, it can be understood that the amplitude of the sub-nanosecond pulse output by the rapid relay LS1, that is, the voltage value of the sub-nanosecond pulse is related to the voltage received by the first contact of the rapid relay LS1, and the output end of the boost module is connected with the first contact of the rapid relay LS1 through the diode D6, so that even if the pulse generation circuit is connected with a low-voltage power supply, the pulse generation circuit can generate the sub-nanosecond pulse with high amplitude, so that the partial discharge monitoring system applicable to the switch cabinet is used for checking.
Specifically, the multivibrator module includes a multivibrator, which is configured to output a square wave to drive the first terminal and the second terminal of the control switch to be turned on and off at a certain frequency, and then drive the driving coil of the flying relay LS1 at a certain frequency, so that the moving contact of the flying relay LS1 is sequentially switched at a certain frequency, and the capacitor C1 is sequentially charged and discharged, thereby generating a sub-nanosecond pulse signal.
It is understood that the quick relay LS1 has a driving coil and a contact group, the contact group includes a first contact and a common terminal, the driving coil of the quick relay LS1 is used for driving the first contact and the common terminal to be switched on or off, in one embodiment, the contact group of the quick relay LS1 further includes a second contact, and the second contact of the quick relay LS1 is used for grounding. Specifically, the quick relay LS1 is one of relays, a contact set of the quick relay LS1 has the characteristic of quick pull-in time, namely the characteristic of short action delay of the relay, and the quick relay LS1 is arranged. Therefore, a driving coil of the fast relay LS1 can control the first contact of the fast relay LS1 to be connected with or disconnected from the common terminal according to a pulse driving signal sent by the multivibrator module, so as to charge and discharge the capacitor C1 in order, thereby generating a sub-nanosecond pulse signal, and outputting the pulse signal through the common terminal of the fast relay LS 1. In one embodiment, the pulse generating circuit has a pulse signal output terminal, and the common terminal of the fast relay LS1 is connected with the pulse signal output terminal, and in one embodiment, the common terminal of the fast relay LS1 is used for connecting a load, and the load is a partial discharge monitoring system of a switch cabinet.
The pulse generating circuit converts direct current into pulse signals by arranging the multivibrator module, drives a driving coil of the rapid relay LS1 to work circularly at a fixed frequency, and enables a movable contact of the rapid relay LS1 to be switched in order at a certain frequency; the boost module is used for raising the voltage of power to send the electric energy to the first contact of rapid relay LS1 behind diode D6, because the movable contact of rapid relay LS1 switches with certain frequency in order to make electric capacity C1 carry out orderly charge-discharge, thereby produce subnanosecond pulse signal, the signal of analog switch cabinet partial discharge, so that the partial discharge monitoring system carries out the verification.
In order to enable the quick relay LS1 to operate reliably, in one embodiment, referring to fig. 1, the pulse generating circuit 10 further includes a sinking module 500, where the sinking module 500 includes a capacitor C2, a resistor R1, and a diode D1, an anode of the diode D1 is connected to a first end of a driving coil of the quick relay LS1, and a cathode of the diode D1 is connected to a second end of the driving coil of the quick relay LS1 through the capacitor C2 and the resistor R1, respectively. Specifically, the cathode of the diode D1 is connected to the second end of the driving coil of the flying relay LS1 through the capacitor C2 and the resistor R1, that is, the cathode of the diode D1 is connected to the first end of the capacitor C2, the second end of the capacitor C2 is connected to the second end of the driving coil of the flying relay LS1, the cathode of the diode D1 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the second end of the driving coil of the flying relay LS1, so it can be understood that the change of the inductive load can be caused by the jumping or the opening and closing of the relay contacts, and the gas discharge phenomenon can be generated, but the current of the relay contacts is small, the arc can not occur between the contacts, but the spark discharge can occur, the spark discharge can cause the interference signal, and the contact group of the flying relay LS1 can be damaged, and the service life of the contact is reduced, and the electric spark can ablate the surface of the contact, so that the uneven surface of the rapid relay LS1 causes the fault of poor contact. An RC circuit is formed by arranging a resistor R1, a capacitor C2 and a diode D1, and two ends of the RC circuit are connected with two ends of the quick relay LS1, so that the energy of the electricity of a driving coil of the quick relay LS1 does not pass through a contact but passes through the RC circuit; since the RC circuit only absorbs the self-inductance potential generated when the contacts are opened. At the instant the relay contacts are closed, the spark of flying relay LS1 is completely absorbed, so that flying relay LS1 can operate reliably.
In order to make the amplitude of the output sub-nanosecond pulse adjustable, in one embodiment, referring to fig. 2, fig. 3 and fig. 6, the pulse generating circuit further includes a voltage regulating module 700, an input end of the voltage regulating module 700 is connected to the output end of the voltage boosting module 100, and an output end of the voltage regulating module 700 is connected to the anode of the diode D6. The negative electrode of the diode D6 is connected with the first contact of the quick relay LS1, the voltage adjusting module is used for adjusting the voltage value received by the first contact of the quick relay LS1, specifically, the input end of the voltage adjusting module is connected with the output end of the boosting module, and the output end of the voltage adjusting module is connected with the first contact of the quick relay LS1 through the diode D6, so that a user can adjust the voltage output by the boosting module through controlling the voltage adjusting module, the voltage received by the first contact of the quick relay LS1 is adjustable, and the amplitude of the output sub-nanosecond pulse can be adjusted due to the fact that the voltage value received by the first contact of the quick relay LS1 is directly related to the amplitude of the sub-nanosecond pulse output by the pulse generating circuit.
In order to enable the voltage regulation module to better regulate the voltage, in one embodiment, please refer to fig. 2, fig. 3 and fig. 6, the voltage regulation module 700 includes an adjustable resistor RP1, a resistor R2, a resistor R3 and an operational amplifier follower U4, a first end of the adjustable resistor RP1 is connected to the output terminal of the boost module 100 through the resistor R2, a second end of the adjustable resistor RP1 is connected to the ground through the resistor R3, a regulation end of the adjustable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier follower U4, and an output terminal of the operational amplifier follower is connected to the anode of the diode D6. Specifically, by setting the adjustable resistor RP1, the resistor R2, and the resistor R3, according to the principle of parallel voltage division, the resistance value of the adjustable resistor RP1 is adjusted, so as to adjust the voltage received by the non-inverting input terminal of the operational amplifier follower, the operational amplifier follower has the characteristics of high input impedance and low output impedance, so as to stabilize the output voltage adjusted by the voltage adjusting module, and send the voltage to the fast relay LS1, so as to facilitate better adjustment of the voltage magnitude for a user, in one embodiment, the adjustable resistor RP1 is an adjustable resistor in a potentiometer, and in one embodiment, the potentiometer is a digital potentiometer, so as to accurately adjust the voltage value. In this embodiment, the voltage regulation module is configured to regulate any one of the 100V dc voltages of the boost module within 1V to 100V.
In order to facilitate the user to view the voltage regulation module to regulate the voltage value, in one embodiment, referring to fig. 6, the pulse generating circuit further includes a voltage display module 710, and the voltage display module 710 is connected to the output end of the voltage regulation module 700. Through the voltage display module, a user can conveniently check the output voltage value of the voltage regulation module.
In an embodiment, referring to fig. 2, 3 and 6, the boost module includes a boost chip U1, an inductor L1 and a capacitor C15, an input terminal of the boost chip is used for being connected to a power supply through the inductor L1, an input terminal of the boost chip U1 is also used for being grounded through the capacitor C15, and an output terminal of the boost chip U1 is connected to an anode of the diode D6. In this embodiment, the output terminal of the boost chip U1 is connected to the anode of the diode D6 through the voltage regulation module, and the cathode of the diode D6 is connected to the first contact of the snap relay LS 1. In this embodiment, electric capacity C15 is electrolytic capacitor, electric capacity C15 positive pole with boost chip U1's input is connected, electric capacity C15's negative pole is used for ground connection, in an embodiment, the module that steps up still includes electric capacity C13, boost chip U1's output is used for through electric capacity C13 ground connection, specifically, through setting up inductance L1 and electric capacity C15, eliminates ripple and noise to the power inlet wire filtering of boost chip input, and inductance C13 filters the voltage of boost chip output.
In order to facilitate the verification of the partial discharge monitoring system, in one embodiment, please refer to fig. 4 and 5, the pulse generating circuit further includes a synchronous output module, an output end of the multivibrator module is further connected to an input end of the synchronous output module, and an output end of the synchronous output module is used for being connected to a trigger device of the partial discharge monitoring system of the switch cabinet. The synchronous output module is used for outputting transistor-transistor logic (TTL) level pulses according to subnanosecond pulse signals output by the pulse generation circuit, the input end of the synchronous output module is connected with the output end of the multivibrator module through the synchronous output module, and when the subnanosecond pulses are output by the pulse generation circuit, the TTL level signals are synchronously output by the synchronous output module and sent to a trigger device of the partial discharge monitoring system, so that the partial discharge monitoring system triggers the verification operation.
In one embodiment, referring to fig. 5, the synchronization output module 600 includes: a monostable flip-flop U3, a capacitor C3 and a resistor R4; the input end of the monostable trigger U3 is connected with the output end of the multivibrator module, the external capacitor end of the monostable trigger U3 is connected with the external resistor end of the monostable trigger U3 through the capacitor C3, the external resistor end of the monostable trigger U3 is also used for being connected with a power supply through the resistor R4, and the output end of the monostable trigger U3 is connected with the synchronous signal output end 610. In one embodiment, the second terminal of the resistor R4 is further connected to the CLR pin of the monostable flip-flop, specifically, the monostable flip-flop has only one stable state and one transient state, and under the action of the applied pulse, the monostable flip-flop can be flipped from the stable state to the transient state, and by setting the capacitor C3 and the resistor R4 as the timing unit of the monostable flip-flop, the timing unit of the monostable flip-flop functions as an RC delay element in the circuit, and the transient state is maintained for a period of time and then returns to the original steady state, and the time for maintaining the transient state depends on the parameter value of the RC. Therefore, the input end of the monostable trigger is connected with the output end of the multivibrator module, so that the monostable trigger can output a TTL level pulse.
In order to enable the multivibrator module to output a pulse signal, in one embodiment, referring to fig. 4, the multivibrator module 200 includes a multivibrator U2, a resistor R5 and a capacitor C4, a first input terminal of the multivibrator U2 is connected to a first terminal of the resistor R5, a second terminal of the resistor R5 is connected to the power supply, a second input terminal of the multivibrator U2 is connected to the ground through the capacitor C4, and an output terminal of the multivibrator U2 is connected to a control terminal of the control switch. Specifically, the multivibrator is an oscillator which utilizes depth positive feedback to alternately turn on and off two electronic devices through resistance-capacitance coupling, so that square wave output is generated by self excitation, and a square wave pulse signal is output.
In order to adjust the frequency of the pulse signal output by the multivibrator module, in one embodiment, referring to fig. 4, the multivibrator module 200 further includes a voltage regulator D2, a selection switch SW1 and at least two first resistors, the selection switch SW1 has a common end and at least two first contacts, the positive electrode of the voltage regulator D2 is connected to the first end of the resistor R5, the positive electrode of the voltage regulator D2 is further connected to the second input end of the multivibrator U2, the negative electrode of the voltage regulator D2 is connected to the common end of the selection switch SW1, and each first contact of the selection switch SW1 is connected to the first input end of the multivibrator module through one of the first resistors. Specifically, referring to fig. 4, in one embodiment, the first resistors are a resistor R16, a resistor R17 and a resistor R18, and the first contact of the selection switch has three first contacts to control the multivibrator to output 50Hz, 100Hz and 200Hz pulse signals. It can be understood that the resistor R5, the capacitor C4 and the first resistor form a timing circuit, and since the oscillation period and the oscillation frequency of the pulse signal output by the multivibrator are related to the resistance of the first resistor, that is, the frequency of the pulse signal output by the multivibrator is related to the resistance of the first resistor, the resistance of the first resistor connected to the multivibrator is adjusted by setting the selector switch to switch the position of the selector switch, so that the pulse signals with different frequencies output by the multivibrator can be adjusted, and further, since the output end of the multivibrator module is connected to the driving coil of the fast relay, the repetition frequency of the sub-nanosecond pulse signal output by the fast relay LS1 can be adjusted by adjusting the frequency of the pulse signal output by the multivibrator.
In order to better enable the control switch to turn on or off the first terminal and the second terminal of the control switch according to the received signal, in one embodiment, referring to fig. 2 and 4, the control switch 300 is a transistor Q1, in one embodiment, the base of the transistor Q1 is connected to the output terminal of the multivibrator module 200, the emitter of the transistor Q1 is connected to ground, and the collector of the transistor Q1 is connected to the first terminal of the driving coil of the fast relay LS 1. Through setting up such control switch, when the pulse signal of multivibrator module is received to triode Q1's base for triode Q1's collecting electrode and emitter switch on, play the effect of switch, thereby can be better make control switch can be according to the signal of receiving, with control switch's first end and second end switch on or break off.
In one embodiment, referring to fig. 2, 3, 4 and 7, the pulse generating circuit further includes a battery module 800, the battery module 800 is connected to the input end of the voltage boosting module 100, the battery module 800 is connected to the input end of the multivibrator module 200, and the output end of the battery module 800 is further connected to the second end of the driving coil of the fast relay LS 1. In one embodiment, the battery module is a lithium battery, and in one embodiment, the lithium battery is a rechargeable lithium battery, and the battery module is arranged to provide power for the boost module, the multivibrator module and the driving coil of the fast relay LS1, so that the pulse generating circuit does not need to be additionally connected with a power supply, and is convenient for a user to use.
In one embodiment, referring to fig. 2, 3, 4 and 7 again, the pulse generating circuit further includes a switch SW2 and a fuse F1, the battery module 800 is connected to the input terminal of the boost module 100, the input terminal of the multivibrator module 200 and the second terminal of the driving coil of the fast relay LS1 through the switch SW2 and the fuse F1, in one embodiment, the pulse generating circuit further includes a filter capacitor C5, the battery module is grounded through the filter capacitor C5, and the switch SW2 is set so as to facilitate a user to control whether the pulse generating circuit needs to generate a sub-nanosecond pulse signal, and the fuse F1 is set to better protect the safety of the circuit. Specifically, the capacitor has the effect of alternating current resistance and direct current resistance, and interference signals generated by the battery module can be filtered by arranging the filter capacitor C5 so as to provide stable direct current for the boosting module.
In one embodiment, referring to fig. 7, the pulse generating circuit further includes a charging protection module 810, an input end of the charging protection module 810 is used for connecting a power supply, and an output end of the charging protection module 810 is connected to the battery module 800. In one embodiment, the charge protection circuit 810 includes: diode D3 and TVS pipe D4, the positive pole of diode D3 is used for connecting the power, diode D3's negative pole with battery module 800 connects, the positive pole of TVS pipe D4 is used for ground connection, the negative pole of TVS pipe D4 with diode D3's negative pole is connected. Specifically, the diode has reverse protection, and the TVS pipe has overvoltage protection's function, so, can prevent through setting up diode D3 and TVS pipe D4 that the battery module from taking place the overcharge phenomenon to better protection battery module.
In one embodiment, referring to fig. 7 and 8, the pulse generating circuit further includes an under-voltage detection module 910; the under-voltage detection module 910 includes a voltage comparator U5 and an indication sub-module 912, wherein an inverting input terminal of the voltage comparator U5 is connected to the battery module 800, a non-inverting input terminal of the voltage comparator U5 is connected to a reference power supply, and an output terminal of the voltage comparator U5 is connected to the indication sub-module 912. In one embodiment, the indication submodule 912 includes a light emitting diode D5 and a transistor Q2, a base of the transistor Q2 is connected to the output terminal of the voltage comparator U5, an anode of the light emitting diode D5 is used for connecting the power supply, a cathode of the light emitting diode D5 is connected to a collector of the transistor Q2, and an emitter of the transistor Q2 is used for grounding. Specifically, the battery module is connected with the inverting input end of the voltage comparator, the non-inverting input end of the voltage comparator is connected with the reference power supply, and when the voltage value of the battery module is smaller than the reference voltage, the output end of the voltage comparator outputs a high-level signal, so that the collector and the emitter of the triode Q2 are conducted, the light-emitting diode D5 is turned on and shines to play an indicating role and remind a user that the electric quantity of the voltage module is low.
In one embodiment, the under-voltage detection module further includes a resistor R25 and a resistor R26, the battery module is connected to the inverting input terminal of the voltage comparator U5 through the resistor R25, and the inverting input terminal of the voltage comparator U5 is further configured to be grounded through the resistor R26. A voltage divider is formed by arranging the resistor R25 and the resistor R26 to measure the power supply voltage, namely, the voltage of the battery is divided, the battery voltage is prevented from exceeding the rated working voltage of the voltage comparator, and the reliability of the undervoltage detection module is improved.
In one embodiment, the boost module includes a boost chip, which is model number FBR 150. The model of the multivibrator is NE555, the first input end of the multivibrator is a DSCHG pin of the multivibrator, the second input end of the multivibrator is a TRG pin of the multivibrator, and the output end of the multivibrator is an OUT pin of the multivibrator. The type of the monostable trigger is 74LS221, the output end of the monostable trigger is a B pin of the monostable trigger, the external capacitor end of the monostable trigger is a C pin of the monostable trigger, the external resistor end of the monostable trigger is an R/C pin of the monostable trigger, and the output end of the monostable trigger is a Q pin of the monostable trigger.
In one embodiment, the pulse generating circuit can output pulse voltage of 1V-100V, the repetition frequency is 50Hz, 100Hz and 200Hz, the rising edge of a single pulse is not higher than 0.5ns, and the half-wave time of the single pulse is not lower than 20 ns. In one embodiment, the single pulse waveform of the sub-nanosecond pulse signal output by the pulse generating circuit is as shown in fig. 9, the rising edge of the single pulse is 0.45ns, and the half-wave time is about 20 ns.
In one embodiment, the quick relay LS1 may be replaced with a solid state relay.
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. The utility model provides a pulse generation circuit, is applied to the partial discharge monitoring system check-up of cubical switchboard which characterized in that includes: the circuit comprises a boosting module, a multivibrator module, a quick relay LS1, a control switch, a diode D6 and a capacitor C1;
the input end of the multivibrator module is used for connecting a power supply, the output end of the multivibrator module is connected with the control end of the control switch, the first end of the control switch is connected with the first end of the driving coil of the quick relay LS1, the second end of the control switch is used for grounding, and the second end of the driving coil of the quick relay LS1 is used for connecting the power supply;
the input end of the boosting module is used for connecting a power supply, the output end of the boosting module is connected with the anode of the diode D6, the cathode of the diode D6 is connected with the first contact of the quick relay LS1, the first contact of the quick relay LS1 is used for being grounded through the capacitor C1, and the common end of the quick relay LS1 is used for outputting a pulse signal.
2. The pulse generating circuit according to claim 1, further comprising a sinking module, wherein the sinking module comprises a capacitor C2, a resistor R1 and a diode D1, wherein an anode of the diode D1 is connected to a first end of the driving coil of the flying relay LS1, and a cathode of the diode D1 is connected to a second end of the driving coil of the flying relay LS1 through the capacitor C2 and the resistor R1, respectively.
3. The pulse generating circuit according to claim 1, further comprising a voltage regulating module, wherein an input terminal of the voltage regulating module is connected to an output terminal of the boosting module, and an output terminal of the voltage regulating module is connected to an anode of the diode D6.
4. The pulse generating circuit according to claim 3, wherein the voltage regulating module comprises an adjustable resistor RP1, a resistor R2, a resistor R3 and an operational amplifier follower U4, a first end of the adjustable resistor RP1 is connected to the output end of the boost module through the resistor R2, a second end of the adjustable resistor RP1 is connected to the ground through the resistor R3, a regulating end of the adjustable resistor RP1 is connected to a non-inverting input end of the operational amplifier follower U4, and an output end of the operational amplifier follower is connected to an anode of the diode D6.
5. The pulse generating circuit of claim 3, further comprising a voltage display module connected to an output of the voltage regulation module.
6. The pulse generating circuit according to claim 1, further comprising a synchronous output module, wherein the output terminal of the multivibrator module is further connected to the input terminal of the synchronous output module, and the output terminal of the synchronous output module is used for being connected to a triggering device of a partial discharge monitoring system of a switch cabinet.
7. The pulse generating circuit according to claim 6, wherein the synchronous output module comprises: a monostable flip-flop U3, a capacitor C3 and a resistor R4;
the input end of the monostable trigger U3 is connected with the output end of the multivibrator module, the external capacitor end of the monostable trigger U3 is connected with the external resistor end of the monostable trigger U3 through the capacitor C3, the external resistor end of the monostable trigger U3 is also used for being connected with a power supply through the resistor R4, and the output end of the monostable trigger U3 is used for being connected with the trigger device of the partial discharge monitoring system of the switch cabinet.
8. The pulse generating circuit of claim 1, wherein the multivibrator module comprises a multivibrator, a resistor R5, and a capacitor C4, a first input terminal of the multivibrator is connected to a first terminal of the resistor R5, a second terminal of the resistor R5 is connected to the power source, a second input terminal of the multivibrator is connected to ground through the capacitor C4, and an output terminal of the multivibrator is connected to the control terminal of the control switch.
9. The pulse generating circuit of claim 8, wherein said multivibrator module further comprises a diode D2, a selector switch and at least two first resistors, said selector switch having a common terminal and at least two first contacts, the anode of said diode D2 being connected to a first terminal of said resistor R5, the anode of said diode D2 being further connected to a second input terminal of said multivibrator, the cathode of said diode D2 being connected to the common terminal of said selector switch, each first contact of said selector switch being connected to a first input terminal of said multivibrator module through one of said first resistors.
10. The pulse generating circuit of claim 1, wherein the control switch is a transistor Q1, a base of the transistor Q1 is connected to the output of the multivibrator module, an emitter of the transistor Q1 is connected to ground, and a collector of the transistor Q1 is connected to the first end of the driving coil of the fast relay LS 1.
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| CN111948345A (en) * | 2020-08-11 | 2020-11-17 | 广东电网有限责任公司广州供电局 | Detection system and method of ozone sensing equipment |
| CN113595386B (en) * | 2021-07-02 | 2023-03-10 | 西安军陶科技有限公司 | Ideal diode circuit and power supply |
| CN114281014A (en) * | 2021-11-17 | 2022-04-05 | 欧尚元(天津)有限公司 | Control method and device for field device program-controlled reflux ratio |
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| FR2432743A1 (en) * | 1978-07-31 | 1980-02-29 | Crouzet Sa | Safety circuit relay contact maintenance circuit - passes periodically high current through contacts to break down oxidation layer |
| CN1026161C (en) * | 1990-10-10 | 1994-10-05 | 成都铁路局绵阳供电段 | Program control testing device for electric equipment |
| US5395394A (en) * | 1993-06-17 | 1995-03-07 | Hewlett-Packard Corporation | Defibrillator with a high voltage solid state relay |
| CN101359433B (en) * | 2008-08-25 | 2010-12-01 | 德州学院 | Multifunctional electromagnetic pulse experiment instrument |
| CN102228815B (en) * | 2011-05-11 | 2014-03-12 | 苏州科技学院 | Positive and negative rotation mixer capable of automatically controlling time length interval |
| CN208421165U (en) * | 2018-03-29 | 2019-01-22 | 广东电网有限责任公司 | Breaker coil power output size detection device |
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Inventor after: Zhang Min Inventor after: Lin Xiang Inventor after: He Jiaxing Inventor after: Wu Shangxian Inventor after: Fang Jian Inventor after: Mo Wenxiong Inventor after: Wang Hongbin Inventor after: Qin Yu Inventor after: Hao Fangzhou Inventor after: Luo Linhuan Inventor after: Chen Shenyu Inventor after: Yin Kuang Inventor before: Zhang Min Inventor before: He Jiaxing Inventor before: Fang Jian Inventor before: Mo Wenxiong Inventor before: Wang Hongbin Inventor before: Qin Yu Inventor before: Hao Fangzhou Inventor before: Luo Linhuan Inventor before: Yin Kuang Inventor before: Lin Xiang |
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Effective date of registration: 20210219 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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Effective date of registration: 20221229 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: GUANGDONG POWER GRID Co.,Ltd. Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. |
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Application publication date: 20191018 Assignee: GUANGZHOU ELECTRIC POWER DESIGN INSTITUTE Co.,Ltd. Assignor: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Contract record no.: X2023980046623 Denomination of invention: Pulse generating circuit Granted publication date: 20200814 License type: Common License Record date: 20231109 |
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