CN219266402U - Alternating current/direct current dual-purpose ammeter circuit - Google Patents
Alternating current/direct current dual-purpose ammeter circuit Download PDFInfo
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- CN219266402U CN219266402U CN202221032453.9U CN202221032453U CN219266402U CN 219266402 U CN219266402 U CN 219266402U CN 202221032453 U CN202221032453 U CN 202221032453U CN 219266402 U CN219266402 U CN 219266402U
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Abstract
The utility model discloses an alternating current/direct current dual-purpose ammeter circuit which comprises a probe for receiving signals, two circuit loops for signal transmission, a voltage dividing resistor R1 for reducing voltage and transmitting the reduced signals to the two circuit loops, a negative electrode contact and a battery for supplying power, wherein each circuit loop is provided with an NPN triode and a PNP triode which are complementary to form a complementary amplifying circuit, and the detection is more accurate.
Description
Technical Field
The utility model relates to the technical field of electrical tools, in particular to an alternating current/direct current dual-purpose ammeter circuit.
Background
The utility model relates to a test pencil, which is an electrical tool frequently used in daily life and work, and is provided with a pencil-shaped shell, wherein one end of the shell is provided with a pen point, and the inside of the shell is connected with a resistor, neon bulb, a spring and the like in series. The utility model can be used for judging zero line and live wire in the home lighting circuit, also can be used for judging whether domestic appliance has the electric leakage phenomenon, and for alternating current measurement, the use of test pencil is simple relatively, only need touch the negative plate contact point at the back with the hand, if have the electricity neon tube can shine, according to the luminous condition of neon bulb, judges whether electrified. However, the test pencil can only measure alternating current, and cannot measure direct current. Meanwhile, if the external light is too strong, the bright observation of the neon tube is affected, and an operator cannot see whether the neon tube is bright or not clearly.
In the prior art, a patent in Chinese utility model publication is named 202111302783.5, and the patent name is: the utility model provides an alternating current-direct current dual-purpose test pencil, includes the shell of form, is equipped with the cutter arbor nib that is used for touching the measured object at shell one end, inlays the negative pole touch point at the other end of shell, is equipped with the circuit board in the inside of shell, be connected with the battery that is used for supplying power between circuit board and the negative pole touch point, be equipped with divider resistor R1 on the circuit board, divide two way through divider resistor R1, one is connected high resistance R2, reconnection zener diode ZD, zener diode ZD reconnection NPN triode Q1's base B, triode Q1's collecting electrode C reconnection emitting diode LED 1's negative pole, emitting diode LED 1's positive pole reconnection battery's negative pole, NPN triode Q1's projecting pole E is reconnected to the negative pole of battery, form a return circuit; the other path is connected with a low-resistance resistor R3, the base B of the PNP triode Q2 is connected again, the collector C of the triode Q2 is connected again with the anode of the light-emitting diode LEDG, the cathode of the light-emitting diode LEDG is connected again with the cathode of the battery, the anode of the battery is connected again with the emitter E of the PNP triode Q2 to form another loop, however, the two loops are amplified by a triode, and the corresponding light-emitting diode is not easy to lighten under the condition of weaker trigger signals.
Disclosure of Invention
The purpose of the utility model is that: in order to overcome the defects of the prior art, the utility model provides an alternating current/direct current dual-purpose ammeter circuit, each circuit is provided with an NPN triode and a PNP triode, which are complementary to form a complementary amplifying circuit, and the detection time is more accurate.
The utility model discloses an alternating current/direct current dual-purpose ammeter circuit, which comprises a probe for receiving signals, two circuit loops for signal transmission, a voltage dividing resistor R1 for reducing voltage and transmitting the reduced signals to the two circuit loops, a negative electrode contact and a battery for supplying power, and is characterized in that: one of the electric loops comprises a triode Q1, a triode Q2 and a light emitting diode LEDG, wherein the base electrode of the triode Q2 is connected with a voltage dividing resistor R1, the collector electrode of the triode Q2 is connected with the base electrode of the triode Q1, the light emitting diode LEDG is connected to the emitting electrode of the triode Q1 and grounded, the collector electrode of the triode Q1 and the emitting electrode of the triode Q2 are connected with the positive electrode of a battery, the other electric loop comprises a voltage stabilizing diode ZD1, a triode Q4, a triode Q3 and a light emitting diode LEDR, the negative electrode of the voltage stabilizing diode ZD1 is connected with the voltage dividing resistor R1, the positive electrode of the voltage stabilizing diode ZD1 is connected with the base electrode of the triode Q4, the positive electrode of the light emitting diode LEDR is connected with the positive electrode of the battery, the negative electrode of the light emitting diode LEDR is connected with the emitting electrode of the triode Q3, the emitting electrode of the triode Q4 and the collecting electrode of the triode Q3 are connected with the negative electrode of the battery, the triode Q2 and the triode Q3 adopt PNP type triode, and the triode Q1 and the triode Q4 adopt NPN type.
By adopting the technical scheme, the collected signals can be detected and amplified through the triode Q2 and the triode Q4, and the detected signals are respectively transmitted to the triode Q1 and the triode Q3 for further signal amplification, so that the driving capability can be improved, the corresponding light emitting diode can be triggered by higher driving capability, and the detection sensitivity and the detection accuracy of the equipment are higher;
electromagnetic fields exist around the zero line and the live line, so that signal error indication of the light emitting diode LEDG and the light emitting diode LEDR can be caused, signal interference of the electromagnetic field to the triode Q2 can be cut off through the R2, signal interference of the electromagnetic field to the triode Q4 can be cut off through the R3, the triode Q2 and the triode Q4 are prevented from being interfered by electromagnetic fields in the surrounding space, abnormal lighting of the light emitting diode LEDG and the light emitting diode LEDR is prevented, and detection of the zero line and the live line is more accurate.
When the positive electrode of a certain direct current power supply is to be detected, the probe is contacted with the positive electrode of the power supply, the probe is propped against the negative electrode contact by hands, the current passes through R1, then passes through a voltage-stabilizing diode ZD1, then passes through a triode Q4, and then passes through a triode Q3 for current amplification, and a loop is formed with a light-emitting diode LEDR, and at the moment, the light-emitting diode LEDR is lighted, namely, the red light is lighted;
when the negative electrode of a certain direct current power supply is to be detected, the probe of the electric pen is contacted with the negative electrode of the power supply, the positive electrode end is contacted with the hand, the current passes through R1, then passes through a triode Q2, and then is amplified by the triode Q1, and a loop is formed with a light-emitting diode LEDG, and at the moment, the LEDG is lighted, namely green light is lighted;
when the live wire of a certain alternating current power supply is to be detected, the electric pen probe is contacted with the live wire end of the power supply, the electric current is propped against the negative electrode contact by hands, the electric current is divided into two paths through R1, one path passes through the triode Q2, and then is amplified by the triode Q1 to form a loop with the light-emitting diode LEDG, and at the moment, the LEDG is lighted, namely, green light is lighted; the other path of current passes through the voltage-stabilizing diode ZD1, then passes through the triode Q4, and then passes through the triode Q3 for current amplification, and forms a loop with the light-emitting diode LEDR, at the moment, the LED R lights, namely red lights and green lights are lighted together;
when the zero line of a certain alternating current power supply is to be detected, the probe of the electric pen is contacted with the zero line end of the power supply, a finger is used for propping against a negative electrode contact, the current of the positive electrode of the battery is divided into 2 paths, one path of current passes through a triode Q2 and then is amplified by a triode Q1 to form a loop with a light-emitting diode LEDG, and the voltage is low level when the zero line is detected, so that after the voltage is reduced through a resistor R1, the LEDG is slightly lighted, namely a green light is slightly lighted; the other path is low-level voltage when the zero line is in, current cannot pass through the voltage stabilizing diode ZD1 and then pass through the triode Q4, at the moment, the triode Q3 and the light emitting diode LEDR cannot form a loop, and the LEDR is extinguished, namely, the red light is not on.
Most preferably, the resistance R1 has a resistance of 2 MegaOhm to 10 MegaOhm.
Most preferably, the resistance R2 has a resistance value of 3.5 MegaOhm to 10 MegaOhm.
Most preferably, the resistance R3 has a resistance of 220K ohms-2 Megaohms.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Description of the embodiments
The following detailed description of specific embodiments of the utility model refers to the accompanying drawings:
the utility model discloses an alternating current/direct current dual-purpose ammeter circuit, which comprises a probe for receiving signals, two circuit loops for signal transmission, a voltage dividing resistor R1 for reducing voltage and transmitting the reduced signals to the two circuit loops, a negative electrode contact and a battery for supplying power, and is characterized in that: one of the electric loops comprises a triode Q1, a triode Q2 and a light emitting diode LEDG, wherein the base electrode of the triode Q2 is connected with a voltage dividing resistor R1, the collector electrode of the triode Q2 is connected with the base electrode of the triode Q1, the light emitting diode LEDG is connected to the emitting electrode of the triode Q1 and grounded, the collector electrode of the triode Q1 and the emitting electrode of the triode Q2 are connected with the positive electrode of a battery, the other electric loop comprises a voltage stabilizing diode ZD1, a triode Q4, a triode Q3 and a light emitting diode LEDR, the negative electrode of the voltage stabilizing diode ZD1 is connected with the voltage dividing resistor R1, the positive electrode of the voltage stabilizing diode ZD1 is connected with the base electrode of the triode Q4, the positive electrode of the light emitting diode LEDR is connected with the positive electrode of the battery, the negative electrode of the light emitting diode LEDR is connected with the emitting electrode of the triode Q3, the emitting electrode of the triode Q4 and the collecting electrode of the triode Q3 are connected with the negative electrode of the battery, the triode Q2 and the triode Q3 adopt PNP type triode, and the triode Q1 and the triode Q4 adopt NPN type.
By adopting the technical scheme, the collected signals can be detected and amplified through the triode Q2 and the triode Q4, and the detected signals are respectively transmitted to the triode Q1 and the triode Q3 for further signal amplification, so that the driving capability can be improved, the corresponding light emitting diode can be triggered by higher driving capability, and the detection sensitivity and the detection accuracy of the equipment are higher;
electromagnetic fields exist around the zero line and the live line, so that signal error indication of the light emitting diode LEDG and the light emitting diode LEDR can be caused, signal interference of the electromagnetic field to the triode Q2 can be cut off through the R2, signal interference of the electromagnetic field to the triode Q4 can be cut off through the R3, the triode Q2 and the triode Q4 are prevented from being interfered by electromagnetic fields in the surrounding space, abnormal lighting of the light emitting diode LEDG and the light emitting diode LEDR is prevented, and detection of the zero line and the live line is more accurate.
When the positive electrode of a certain direct current power supply is to be detected, the probe is contacted with the positive electrode of the power supply, the probe is propped against the negative electrode contact by hands, the current passes through R1, then passes through a voltage-stabilizing diode ZD1, then passes through a triode Q4, and then passes through a triode Q3 for current amplification, and a loop is formed with a light-emitting diode LEDR, and at the moment, the light-emitting diode LEDR is lighted, namely, the red light is lighted;
when the negative electrode of a certain direct current power supply is to be detected, the probe of the electric pen is contacted with the negative electrode of the power supply, the positive electrode end is contacted with the hand, the current passes through R1, then passes through a triode Q2, and then is amplified by the triode Q1, and a loop is formed with a light-emitting diode LEDG, and at the moment, the LEDG is lighted, namely green light is lighted;
when the live wire of a certain alternating current power supply is to be detected, the electric pen probe is contacted with the live wire end of the power supply, the electric current is propped against the negative electrode contact by hands, the electric current is divided into two paths through R1, one path passes through the triode Q2, and then is amplified by the triode Q1 to form a loop with the light-emitting diode LEDG, and at the moment, the LEDG is lighted, namely, green light is lighted; the other path of current passes through the voltage-stabilizing diode ZD1, then passes through the triode Q4, and then passes through the triode Q3 for current amplification, and forms a loop with the light-emitting diode LEDR, at the moment, the LED R lights, namely red lights and green lights are lighted together;
when the zero line of a certain alternating current power supply is to be detected, the probe of the electric pen is contacted with the zero line end of the power supply, a finger is used for propping against a negative electrode contact, the current of the positive electrode of the battery is divided into 2 paths, one path of current passes through a triode Q2 and then is amplified by a triode Q1 to form a loop with a light-emitting diode LEDG, and the voltage is low level when the zero line is detected, so that after the voltage is reduced through a resistor R1, the LEDG is slightly lighted, namely a green light is slightly lighted; the other path is low-level voltage when the zero line is in, current cannot pass through the voltage stabilizing diode ZD1 and then pass through the triode Q4, at the moment, the triode Q3 and the light emitting diode LEDR cannot form a loop, and the LEDR is extinguished, namely, the red light is not on.
Most preferably, the resistance R1 has a resistance of 2 MegaOhm to 10 MegaOhm.
Most preferably, the resistance R2 has a resistance value of 3.5 MegaOhm to 10 MegaOhm.
Most preferably, the resistance R3 has a resistance of 220K ohms-2 Megaohms.
Claims (4)
1. The utility model provides an alternating current-direct current dual-purpose ammeter circuit, includes the probe that is used for accepting the signal, is used for two electric loops of signal transmission, is used for step down and will step down the divider resistance R1 on the signal transmission to two electric loops after the step down, negative pole contact and is used for the battery of power supply, its characterized in that: one of them electric loop includes triode Q1, triode Q2 and emitting diode LEDG, triode Q2's base and bleeder resistor R1 are connected, triode Q2's collecting electrode links to each other with triode Q1's base, emitting diode LEDG connects on triode Q1's transmitting pole and ground connection setting, triode Q1's collecting electrode and triode Q2 projecting pole are connected with the positive pole of battery, still including resistance R2, resistance R2 one end is connected on triode Q2 base, the other end is connected on triode Q2's transmitting pole, another electric loop includes zener diode ZD1, triode Q4, triode Q3 and emitting diode LEDR, zener diode ZD 1's negative pole links to each other with bleeder resistor R1, its positive pole is connected with triode Q4's base, triode Q4's collecting electrode is connected with triode Q3's base, emitting diode LEDR's positive pole is connected with battery positive pole and emitting diode Q3's projecting pole, triode Q4's projecting pole and triode Q3's projecting pole are connected with battery negative pole, still including resistance R3 is connected with the battery negative pole, triode Q3 is connected with triode Q3, the one end adopts triode Q4 to adopt triode Q3 to adopt triode Q4 to launch on another triode Q4 to adopt triode Q4 to launch the one end.
2. An ac/dc dual-purpose ammeter circuit according to claim 1, wherein: the resistance R1 has a resistance value of 2 Megaohms-10 Megaohms.
3. An ac/dc dual-purpose ammeter circuit according to claim 1 or 2, wherein: the resistance R2 has a resistance value of 3.5 megaohms to 10 megaohms.
4. An ac/dc dual-purpose ammeter circuit according to claim 3, wherein: the resistance of the resistor R3 is 220 Kohm-2 megaohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221032453.9U CN219266402U (en) | 2022-04-29 | 2022-04-29 | Alternating current/direct current dual-purpose ammeter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221032453.9U CN219266402U (en) | 2022-04-29 | 2022-04-29 | Alternating current/direct current dual-purpose ammeter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219266402U true CN219266402U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221032453.9U Active CN219266402U (en) | 2022-04-29 | 2022-04-29 | Alternating current/direct current dual-purpose ammeter circuit |
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| Country | Link |
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| CN (1) | CN219266402U (en) |
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- 2022-04-29 CN CN202221032453.9U patent/CN219266402U/en active Active
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