CN107861093B - Portable electric energy metering wiring verification device - Google Patents
Portable electric energy metering wiring verification device Download PDFInfo
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- CN107861093B CN107861093B CN201711148575.8A CN201711148575A CN107861093B CN 107861093 B CN107861093 B CN 107861093B CN 201711148575 A CN201711148575 A CN 201711148575A CN 107861093 B CN107861093 B CN 107861093B
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- 238000012795 verification Methods 0.000 title abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 11
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- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
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- 238000012937 correction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
The application provides a portable electric energy metering wiring verification device, which is used for verifying whether wiring of an inner coil and a mutual inductance coil in a meter is correct when a secondary wire of the electric energy metering device is wired, and comprises a host and a measuring wire, wherein: the host comprises a shell, a display panel is arranged on the shell, at least a power switch and three indicator lamps are arranged on the display panel, and the three indicator lamps are respectively a correct wiring indicator lamp, a reverse polarity indicator lamp and a line disconnection indicator lamp; the host is internally provided with a circuit board, and the circuit board is at least provided with a signal generating circuit, a measuring point voltage amplifying circuit, an amplified signal comparing circuit, an indicator light driving circuit and a power management unit which are mutually connected. The application has the characteristics of convenient carrying, easy operation, safe and reliable measurement result, and the like.
Description
Technical Field
The application relates to the technical field of power supply networks, in particular to a portable electric energy metering wiring verification device.
Background
In recent years, with the development of social electricity consumption and the updating of electric energy metering technology and the deepening application of power supply departments to intelligent electric meters and meter collection, the replacement frequency and workload of the electric meters are greatly improved, metering abnormality caused by the occurrence of electric meter wiring errors is also increased, and particularly, the probability of wrong wiring of a metering device with a transformer is larger, the electricity leakage metering quantity is larger, and the difficulty of electric charge recovery is increased. The metering wiring error mainly has two reasons, namely, wiring is not checked according to the procedure after the installation is finished; secondly, the wire needs to be disassembled for measurement when checking the wiring, and the misconnection or misconnection is easily caused when the wiring is restored.
In order to improve the working efficiency of the metering staff, a device capable of checking wiring without disconnecting after the metering device is installed is required to be developed.
Disclosure of Invention
The application aims to solve the technical problem of providing the portable electric energy metering wiring verification device which has the characteristics of convenience in carrying, easiness in operation, safe and reliable measurement results and the like.
In order to solve the above technical problems, an aspect of an embodiment of the present application provides a portable electric energy metering connection verification device for verifying whether a coil in a meter and a mutual inductance coil are connected correctly, which includes a host and a measurement wire, wherein:
the host comprises a shell, a display panel is arranged on the shell, at least a power switch and three indicator lamps are arranged on the display panel, and the three indicator lamps are respectively a correct wiring indicator lamp, a reverse polarity indicator lamp and a line disconnection indicator lamp;
the host is internally provided with a circuit board, and the circuit board is at least provided with a signal generating circuit, a measuring point voltage amplifying circuit, an amplified signal comparing circuit, an indicator light driving circuit and a power management unit which are connected with each other;
the signal generating circuit is used for generating a high-frequency signal and inputting the high-frequency signal into the unpowered meter through the measuring wire;
the measuring point voltage rectifying and amplifying circuit is used for obtaining the voltage at a preset measuring point after being connected with the measuring meter, rectifying and amplifying, and each wiring state of the measuring meter corresponds to the voltage value at one measuring point;
the amplified signal comparison processing circuit comprises three comparators, wherein the three comparators are respectively connected with the amplified signals of the measuring point voltage, respectively compare with the preset comparison reference voltage, and process the output signals to obtain three groups of driving signals, and only one of the three groups of driving signals is at a high level;
the indicating lamp driving circuit comprises at least three triodes which respectively receive the three groups of driving signals, each triode is connected with an indicating lamp, and when the received driving signals are in high level, the indicating lamps connected with the triodes are conducted to indicate the current wiring state of the meter;
and the power management circuit is used for obtaining stable working voltages VCC and VEE and supplying power to the signal generating circuit, the measuring point voltage amplifying circuit, the amplified signal comparing circuit, the indicator lamp driving circuit and the buzzer driving circuit.
Wherein the signal generating circuit includes:
the first output end of the high-frequency signal generator is grounded and connected with a first measuring wire, and the first measuring wire is connected with an in-meter coil of the meter; the second end of the first resistor is connected with the first end of the first resistor, the second end of the first resistor is connected with a second measuring wire, and the second connecting wire is connected with a mutual inductance coil of the meter; the second end of the first resistor is used as a preset measuring point.
The measuring point voltage rectifying and amplifying circuit comprises:
the second end of the bridge rectifier is connected with the measuring point, and the third end and the fourth end of the bridge rectifier are grounded;
the reverse input end of the amplifier is grounded through a second resistor, and the positive input end of the amplifier is connected with the first end of the bridge rectifier; a third resistor is connected between the output end and the reverse input end of the power supply, and the positive and negative power supply ends of the power supply are respectively connected with VCC and VEE.
Wherein the amplified signal comparison processing circuit includes:
the non-inverting input end of the first comparator is connected with the output end of the amplifier, the inverting input end of the first comparator is connected with the third end of a fourth adjustable resistor, and the other two ends of the fourth adjustable resistor are respectively connected with VCC and ground; the output end of the inverter is connected with VCC through a fourteenth resistor, the output end of the inverter is connected with a first inverter, and the output end of the inverter is connected with thirteen resistors;
the non-inverting input end of the second comparator is connected with the output end of the amplifier, the inverting input end of the second comparator is connected with the third end of a fifth adjustable resistor, and the other two ends of the fifth adjustable resistor are respectively connected with VCC and ground; the output end of the voltage regulator is connected with VCC through a fifteenth resistor, the output end of the voltage regulator is connected with a first input end of an AND gate, and the output end of the AND gate is connected with twelve resistors;
the non-inverting input end of the third comparator is connected with the output end of the amplifier, the inverting input end of the third comparator is connected with the third end of a sixth adjustable resistor, and the other two ends of the sixth adjustable resistor are respectively connected with VCC and ground; the output end of the third comparator is connected with the VCC through a sixteenth resistor, the output end of the third comparator is connected with a second inverter, and the output end of the inverter is connected with the second input end of the AND gate; the output end of the third comparator is connected with eleven resistors.
Wherein, the pilot lamp drive circuit includes:
the base electrode of the first triode is connected with the thirteenth resistor, the collector electrode of the first triode is connected with the cathode of the first diode, the emitter of the first triode is grounded, the anode of the first diode is connected with VCC, and the first diode is a correctly-wired indicator lamp;
the base electrode of the third triode is connected with the twelfth resistor, the collector electrode of the third triode is connected with the negative electrode of the third diode, the emitter electrode of the third triode is grounded, the positive electrode of the third diode is connected with VCC, and the third diode is a polarity reversal indicator lamp;
and the base electrode of the fourth triode is connected with the eleventh resistor, the collector electrode of the fourth triode is connected with the cathode of the fourth diode, the emitter of the fourth triode is grounded, the anode of the fourth diode is connected with VCC, and the fourth diode is a line disconnection indicator lamp.
The display panel is further provided with a buzzer indicator lamp, the circuit board is further provided with a buzzer driving circuit, and the buzzer driving circuit comprises:
a first NOR gate, a first input end of which is connected with the output end of the first inverter, and a second input end of which is connected with the output end of the AND gate;
the first input end and the second input end of the second NOR gate are connected with the output end of the first NOR gate;
and the base electrode of the third triode is connected with the output end of the second NOR gate, the collector electrode of the third triode is connected with the negative electrode of the third diode, the emitter electrode of the third triode is grounded, the positive electrode of the third diode is connected with VCC, and the third diode is a buzzer indicator lamp.
The VCC is +5V, the VEE is-5V, the positions of the third ends of the fifth adjustable resistor and the sixth adjustable resistor are different, and the comparison reference voltage of the input end of the second comparator is smaller than that of the input end of the third comparator.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides a portable electric energy metering wiring verification device based on a high-frequency signal, which realizes the function of verifying whether wiring is correct or not without disconnecting after the metering device is installed. The device applies the principle that high impedance is presented when the inductance of the transformer coil passes through high-frequency current, three states of on/off and high impedance are presented when high-frequency electric signals are passed between the ammeter end button box of the non-electrified metering device and the wiring of the current transformer, voltage is measured at a secondary terminal close to the transformer, whether wiring is correct or not is judged through the color of a diode and the sound of a buzzer according to the relation between the voltage and the wiring state, so that the correction of the electric energy metering wiring is judged, the risk of wiring error or polarity reverse connection is reduced, and the device has the characteristics of convenience in carrying, easiness in operation, safe and reliable measuring results and the like.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the external structure of a host computer of a portable electric energy metering wiring verification device according to the present application;
FIG. 2 is a schematic diagram of a circuit frame structure in an embodiment of a portable electrical energy metering wiring verification device according to the present application;
FIG. 3 is an equivalent circuit diagram of the meter of FIG. 2 when wired correctly;
FIG. 4 is an equivalent circuit diagram of the meter of FIG. 2 with reversed polarity;
fig. 5 is an equivalent circuit diagram of the meter of fig. 2 when the line is broken;
fig. 6 is a schematic diagram of a corresponding circuit in one embodiment of fig. 2.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted here that, in order to avoid obscuring the present application due to unnecessary details, only structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not greatly related to the present application are omitted.
Fig. 1 shows a schematic diagram of the external structure of a host of the portable electric energy metering wiring verification device provided by the application, and is combined with fig. 2. In this embodiment, this portable electric energy measurement wiring verifying attachment for whether the table inner coil of check meter and mutual-inductance coil wiring are correct, it includes host computer 1 and measurement wire, wherein:
the host 1 comprises a housing 10, a display panel 11 is arranged on the housing 10, at least a power switch 12, three indicator lamps 13 and a buzzer indicator lamp 15 are arranged on the display panel 11, and the three indicator lamps 13 are respectively a correct wiring indicator lamp ("on"), a reverse polarity indicator lamp ("reverse polarity") and a line disconnection indicator lamp ("off");
the host 1 is internally provided with a circuit board 14 (not shown), and the circuit board 14 is provided with at least a signal generating circuit 140, a measuring point voltage amplifying circuit 141, an amplified signal comparing circuit 142, an indicator light driving circuit 143 and a power management unit 145 which are connected with each other;
the signal generating circuit 140 is used for generating a high-frequency signal and inputting the high-frequency signal into the unpowered meter 2 through two measuring wires;
the measuring point voltage rectifying and amplifying circuit 141 is used for obtaining the voltage at a preset measuring point (point a) after being connected with the meter, rectifying and amplifying, and each wiring state of the meter 2 corresponds to the voltage value at one measuring point;
the amplified signal comparison processing circuit 142 includes three comparators, which are respectively connected to the amplified signals of the measuring point voltages, respectively compare the amplified signals with a predetermined comparison reference voltage, and process the output signals to obtain three groups of driving signals, wherein only one of the three groups of driving signals is at a high level;
the indicator light driving circuit 143 includes at least three triodes, which respectively receive the three sets of driving signals, and each triode is connected with an indicator light, and when the received driving signal is at a high level, the indicator light 13 connected with the triode is turned on to indicate the current wiring state of the meter;
the buzzer driving circuit 144 is configured to generate a buzzer driving signal according to the driving signal of the amplified signal comparison processing circuit 142, and control the on/off of the buzzer indicator lamp 15;
the power management circuit 145 is configured to obtain stable operating voltages VCC and VEE, and supply power to the signal generating circuit 140, the measurement point voltage amplifying circuit 141, the amplified signal comparing circuit 142, the indicator light driving circuit 143, and the buzzer driving circuit 144.
In one example, the measuring wire is a copper core wire, and is provided with a special testing clamp, and different colors (such as red and black) are adopted, and different length specifications (such as 1m and 2m length specifications) can also be adopted.
As shown in fig. 3 to 5, the equivalent circuit diagrams of the meter in three wiring states are shown, wherein fig. 3 is an equivalent diagram when the meter is correctly wired, fig. 4 is an equivalent diagram when the polarities of the meters are reversed, and fig. 5 is an equivalent diagram when the meter is disconnected; from the above, when the wiring is correct, the point A is equivalent to direct grounding; when the polarities are reversely connected, the coils in the meter (CT in the meter) are connected in parallel with the mutual inductance coils (CT in the meter) and then connected in series with the resistor R1; when the line is disconnected, the mutual inductance diagram is equivalent to the series connection of the resistor R1; in these three cases, the voltage at the measurement point (point a) will have three different values.
In one example, when the signal generator generates a high-frequency sine wave signal of 0-5MHz, the CT and the metering current transformer in the meter are equivalent to reactance, and when the high-frequency signal respectively shows three states of conduction, high resistance and disconnection under three wiring conditions of correct connection, polarity inversion and line disconnection, the voltage at the point A of the measurement point has a certain relation with the wiring condition, as shown in the following diagram, and the wiring condition of the line is judged according to the voltage of the point A:
TABLE 1 connection status vs. A Point voltage
| Connection state | Point A voltage (UA) | Panel LED |
| Conduction | 0mV | On lamp lighting |
| Reverse connection | 20-50mV | High resistance lamp lighting |
| Open circuit | 200-300mV | Off lamp lighting |
As shown in fig. 6, a corresponding schematic circuit diagram in one embodiment of fig. 2 is shown. In the embodiment, the signal generating circuit 140 includes:
the first output end of the high-frequency signal generator MAX038 is grounded and is connected with a first measuring wire which is connected with an in-meter coil of the meter; the second end of the first resistor is connected with the first end of the first resistor, the second end of the first resistor is connected with a second measuring wire, and the second connecting wire is connected with a mutual inductance coil of the meter; the second end of the first resistor is used as a preset measuring point (point A). The high-frequency signal generator can generate a sine wave signal of 0-5MHz, and the high-frequency signal is directly sent to two terminals which need to be judged whether the connection is correct or not through a test bar;
the measuring point voltage rectifying and amplifying circuit 141 includes:
the second end of the bridge rectifier D1 is connected with the measuring point, the third end and the fourth end of the bridge rectifier D1 are grounded, and the high-frequency signal at the point A is rectified to become a direct-current signal;
the reverse input end of the amplifier U1 is grounded through a second resistor R2, and the positive input end of the amplifier U1 is connected with the first end of the bridge rectifier D1; a third resistor R3 is connected between the output end and the reverse input end of the power supply, and the positive and negative power supply ends of the power supply are respectively connected with VCC and VEE.
The amplified signal comparison processing circuit 142 includes:
the non-inverting input end of the first comparator U2 is connected with the output end of the amplifier U1, the inverting input end of the first comparator U2 is connected with the third end of the fourth adjustable resistor R4, and the other two ends of the fourth adjustable resistor R4 are respectively connected with VCC and ground; the output end of the first comparator U2 is connected with VCC through a fourteenth resistor, the output end of the first comparator U2 is connected with a first inverter U6A, and the output end of the first inverter U6A is connected with a thirteenth resistor Rl3;
the non-inverting input end of the second comparator U3 is connected with the output end of the amplifier U1, the inverting input end of the second comparator U3 is connected with the third end of the fifth adjustable resistor R5, and the other two ends of the fifth adjustable resistor R5 are respectively connected with VCC and ground; the output end of the second comparator U3 is connected with VCC through a fifteenth resistor R15, the output end of the second comparator U is connected with the first input end of an AND gate U7A, and the output end of the AND gate U7A is connected with a twelfth resistor R12;
the non-inverting input end of the third comparator U4 is connected with the output end of the amplifier U1, the inverting input end of the third comparator U4 is connected with the third end of the sixth adjustable resistor R6, and the other two ends of the sixth adjustable resistor R6 are respectively connected with VCC and ground; the output end of the third comparator U4 is connected with VCC through a sixteenth resistor R16, the output end of the third comparator U4 is connected with a second inverter U6C, and the output end of the second inverter U6C is connected with the second input end of the AND gate U7A; the third comparator output U4 is connected to an eleventh resistor R11.
The indicator light driving circuit 143 includes:
the base electrode of the first triode Q1 is connected with the thirteenth resistor R13, the collector electrode of the first triode Q1 is connected with the negative electrode of the first diode LED1, the emitter electrode of the first triode Q1 is grounded, the positive electrode of the first diode LED1 is connected with VCC, and the first diode LED1 is a correctly-wired indicator lamp;
the base electrode of the third triode Q3 is connected with the twelfth resistor R12, the collector electrode of the third triode Q is connected with the negative electrode of the third diode LED3, the emitter electrode of the third triode Q is grounded, the positive electrode of the third diode LED3 is connected with VCC, and the third diode LED3 is a polarity reverse indicator lamp;
and the base electrode of the fourth triode Q4 is connected with the eleventh resistor R11, the collector electrode of the fourth triode Q is connected with the negative electrode of the fourth diode LED4, the emitter electrode of the fourth triode Q is grounded, the positive electrode of the fourth diode LED4 is connected with VCC, and the fourth diode LED4 is a line disconnection indicator lamp.
The buzzer driving circuit 144 includes:
a first nor gate U5A, a first input end of which is connected to the output end of the first inverter U6A, and a second input end of which is connected to the output end of the and gate U7A;
the first input end and the second input end of the second nor gate U5B are connected with the output end of the first nor gate U5A;
and the base electrode of the third triode Q3 is connected with the output end of the second NOR gate U5B, the collector electrode of the third triode Q is connected with the negative electrode of the third diode LED3, the emitter electrode of the third triode Q is grounded, the positive electrode of the third diode LED3 is connected with VCC, and the third diode LED3 is a buzzer indicator lamp.
In the power management circuit 145, two sections of 3.7V rechargeable lithium batteries are connected in series to form a power supply of the device, 7.4V voltage obtained after the serial connection is converted into positive and negative 7.4V voltage through an ICL7660 chip, and the positive and negative 5V voltage is converted into positive and negative 5V voltage through 7805 and 7905 three-terminal voltage stabilizing chips respectively, namely VCC and VEE.
The third ends of the fifth adjustable resistor R5 and the sixth adjustable resistor R6 are located at different positions, and the comparison reference voltage of the input end of the second comparator U3 is smaller than the comparison reference voltage of the input end of the third comparator U4.
It can be understood that in the embodiment of the application, by adopting a common high-frequency signal generator, the three-phase current, the three-phase voltage and the zero line are selected by the change-over switch, and the wire inlet ends of the three-phase current, the three-phase voltage and the zero line are respectively connected with a high-frequency signal terminal matching resistor to the ground of the device at the end of the meter so as to form a high-frequency signal number loop. And whether the current, the voltage and the zero line of each phase are correctly connected or not can be determined through the display state of the display module.
Specifically, the working principle of the checking device is that the mutual inductor can be equivalent to a reactor in a circuit, a high-frequency signal is injected into a secondary circuit of the meter by utilizing the property of 'direct current resistance and alternating current' of the reactance, and whether the wiring is correct or not is judged by measuring the attenuation of the signal, and the specific using method is as follows:
the method comprises the steps of connecting wires, as shown in fig. 6, with a meter pen + 'connected with a transformer K1 end and with a meter pen-' connected with a wire inlet end corresponding to an ammeter;
electrifying, and opening a power switch button;
if the on indicator lights are on and the buzzer sounds long, the wiring is correct;
if the polarity reverse connection indicator lights are on, the polarity reverse connection is indicated;
if the disconnection indicator lights, the connection is disconnected.
The embodiment of the application has the following beneficial effects:
the embodiment of the application provides a portable electric energy metering wiring verification device based on a high-frequency signal, which realizes the function of verifying whether wiring is correct or not without disconnecting after the metering device is installed. The device applies the principle that high impedance is presented when the inductance of the transformer coil passes through high-frequency current, three states of on/off and high impedance are presented when high-frequency electric signals are passed between the ammeter end button box of the non-electrified metering device and the wiring of the current transformer, voltage is measured at a secondary terminal close to the transformer, whether wiring is correct or not is judged through the color of a diode and the sound of a buzzer according to the relation between the voltage and the wiring state, so that the correction of the electric energy metering wiring is judged, the risk of wiring error or polarity reverse connection is reduced, and the device has the characteristics of convenience in carrying, easiness in operation, safe and reliable measuring results and the like.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.
Claims (7)
1. The utility model provides a portable electric energy measurement wiring verifying attachment for whether the table inner coil of check meter and mutual-inductance coil wiring are correct, its characterized in that includes host computer and measurement wire, wherein:
the host comprises a shell, a display panel is arranged on the shell, at least a power switch and three indicator lamps are arranged on the display panel, and the three indicator lamps are respectively a correct wiring indicator lamp, a reverse polarity indicator lamp and a line disconnection indicator lamp;
the host is internally provided with a circuit board, and the circuit board is at least provided with a signal generating circuit, a measuring point voltage amplifying circuit, an amplified signal comparing circuit, an indicator light driving circuit and a power management unit which are connected with each other;
the signal generating circuit is used for generating a high-frequency signal and inputting the high-frequency signal into the unpowered meter through the measuring wire;
the measuring point voltage amplifying circuit is used for obtaining the voltage at a preset measuring point after being connected with the measuring meter, rectifying and amplifying, and each wiring state of the measuring meter corresponds to the voltage value at one measuring point;
the amplified signal comparison circuit comprises three comparators, wherein the three comparators are respectively connected with the amplified signals of the measuring point voltage, respectively compare with a preset comparison reference voltage, and process output signals to obtain three groups of driving signals, and only one of the three groups of driving signals is at a high level;
the indicating lamp driving circuit comprises at least three triodes which respectively receive the three groups of driving signals, each triode is connected with an indicating lamp, and when the received driving signals are in high level, the indicating lamps connected with the triodes are conducted to indicate the current wiring state of the meter;
and the power management circuit is used for obtaining stable working voltages VCC and VEE and supplying power to the signal generating circuit, the measuring point voltage amplifying circuit, the amplified signal comparing circuit and the indicator lamp driving circuit.
2. The apparatus of claim 1, wherein the signal generation circuit comprises:
the first output end of the high-frequency signal generator is grounded and connected with a first measuring wire, and the first measuring wire is connected with an in-meter coil of the meter; the second end of the first resistor is connected with the first end of the first resistor, the second end of the first resistor is connected with a second measuring wire, and the second measuring wire is connected with a mutual inductance coil of the meter; the second end of the first resistor is used as a preset measuring point.
3. The apparatus of claim 2, wherein the station voltage amplification circuit comprises:
the second end of the bridge rectifier is connected with the measuring point, and the third end and the fourth end of the bridge rectifier are grounded;
the reverse input end of the amplifier is grounded through a second resistor, and the positive input end of the amplifier is connected with the first end of the bridge rectifier; a third resistor is connected between the output end and the reverse input end of the power supply, and the positive and negative power supply ends of the power supply are respectively connected with VCC and VEE.
4. The apparatus of claim 3, wherein the amplified signal comparison circuit comprises:
the positive input end of the first comparator is connected with the output end of the amplifier, the reverse input end of the first comparator is connected with the third end of the fourth adjustable resistor, and the other two ends of the fourth adjustable resistor are respectively connected with VCC and ground; the output end of the first comparator is connected with the VCC through a fourteenth resistor, the output end of the first comparator is connected with a first inverter, and the output end of the first inverter is connected with a thirteenth resistor;
the positive input end of the second comparator is connected with the output end of the amplifier, the reverse input end of the second comparator is connected with the third end of a fifth adjustable resistor, and the other two ends of the fifth adjustable resistor are respectively connected with VCC and ground; the output end of the second comparator is connected with VCC through a fifteenth resistor, the output end of the second comparator is connected with the first input end of an AND gate, and the output end of the AND gate is connected with a twelfth resistor;
the positive input end of the third comparator is connected with the output end of the amplifier, the reverse input end of the third comparator is connected with the third end of a sixth adjustable resistor, and the other two ends of the sixth adjustable resistor are respectively connected with VCC and ground; the output end of the third comparator is connected with the VCC through a sixteenth resistor, the output end of the third comparator is connected with a second inverter, and the output end of the second inverter is connected with the second input end of the AND gate; the output end of the third comparator is connected with an eleventh resistor.
5. The apparatus of claim 4, wherein the indicator light driving circuit comprises:
the base electrode of the first triode is connected with the thirteenth resistor, the collector electrode of the first triode is connected with the cathode of the first diode, the emitter of the first triode is grounded, the anode of the first diode is connected with VCC, and the first diode is a correctly-wired indicator lamp;
the base electrode of the third triode is connected with the twelve resistors, the collector electrode of the third triode is connected with the cathode of the third diode, the emitter of the third triode is grounded, the anode of the third diode is connected with VCC, and the third diode is a polarity reversal indicator lamp;
and the base electrode of the fourth triode is connected with the eleventh resistor, the collector electrode of the fourth triode is connected with the cathode of the fourth diode, the emitter of the fourth triode is grounded, the anode of the fourth diode is connected with VCC, and the fourth diode is a line disconnection indicator lamp.
6. The apparatus of claim 5, further comprising a buzzer indicator light on the display panel, and further comprising a buzzer driving circuit on the circuit board, the buzzer driving circuit comprising:
a first NOR gate, a first input end of which is connected with the output end of the first inverter, and a second input end of which is connected with the output end of the AND gate;
the first input end and the second input end of the second NOR gate are connected with the output end of the first NOR gate;
and the base electrode of the third triode is connected with the output end of the second NOR gate, the collector electrode of the third triode is connected with the negative electrode of the third diode, the emitter electrode of the third triode is grounded, the positive electrode of the third diode is connected with VCC, and the third diode is a buzzer indicator lamp.
7. The apparatus of claim 6, wherein VCC is +5v, VEE is-5V, the third ends of the fifth and sixth adjustable resistors are located at different positions, and the comparison reference voltage at the second comparator input is less than the comparison reference voltage at the third comparator input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112130093B (en) * | 2020-08-14 | 2023-11-28 | 国网浙江省电力有限公司培训中心 | Alignment detection device for realizing disconnection-free test by utilizing linear Hall sensor |
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| JPS6055276A (en) * | 1983-09-05 | 1985-03-30 | Hitachi Plant Eng & Constr Co Ltd | Device for discriminating correctness/incorrectness of wire connection |
| SU1216782A1 (en) * | 1984-04-06 | 1986-03-07 | Рижское Ордена Ленина Производственное Объединение Вэф Им.В.И.Ленина | Device for checking wiring correctness |
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| CN107861093A (en) | 2018-03-30 |
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