CN209821274U - Optical coupler detection current circuit - Google Patents
Optical coupler detection current circuit Download PDFInfo
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- CN209821274U CN209821274U CN201920261099.9U CN201920261099U CN209821274U CN 209821274 U CN209821274 U CN 209821274U CN 201920261099 U CN201920261099 U CN 201920261099U CN 209821274 U CN209821274 U CN 209821274U
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Abstract
The utility model discloses an opto-coupler detection current circuit relates to circuit current detection technical field, including coupling sampling resistance R24, opto-coupler U3 and divider resistance R19 in the main circuit, opto-coupler U3 includes emitting diode D1 and phototriode Q1, phototriode Q1 receives emitting diode D1's control; the cathode of the led D1 is coupled to one end of the resistor R24, the anode of the led D1 is coupled to the resistor R9, and the resistor R9 is coupled to the other end of the resistor R24; the collector of the phototransistor Q1 is coupled to the power supply, the emitter of the phototransistor Q1 is coupled to the resistor R19, and the end of the resistor R19 away from the phototransistor Q1 is grounded. There is current detection circuit problem with high costs to prior art, the utility model discloses utilize the photoelectric transmission characteristic of opto-coupler, reachd corresponding main circuit median current value to effectively reduce detection circuitry's cost, be applicable to and use widely in numerous little electrical products.
Description
Technical Field
The utility model relates to a circuit current detection technical field, more specifically say, it relates to an opto-coupler detection current circuit.
Background
In a control circuit, it is often necessary to detect a current in a main circuit to control a control object, especially when the current in the main circuit is small.
In the prior art, a current transformer is mostly adopted to detect the current in a main circuit, although the performance of the current transformer is good, the problem of cost increase of electronic products can be caused due to the high cost of the current transformer for common electrical products such as paper shredders and the like, and the current transformer is not suitable for being popularized and used in various small household electrical appliances.
SUMMERY OF THE UTILITY MODEL
To prior art there is current detection circuit problem with high costs, the utility model aims at providing an opto-coupler detection current circuit, it has economical and practical's advantage.
In order to achieve the above purpose, the utility model provides a following technical scheme:
an optical coupler detection current circuit is used for detecting current in a main circuit and comprises a sampling resistor R24, an optical coupler U3 and a voltage dividing resistor R19 which are coupled in the main circuit, wherein the optical coupler U3 comprises a light emitting diode D1 and a phototriode Q1, and the phototriode Q1 is controlled by the light emitting diode D1;
the cathode of the led D1 is coupled to one end of the resistor R24, the anode of the led D1 is coupled to the resistor R9, and the resistor R9 is coupled to the other end of the resistor R24;
the collector of the phototransistor Q1 is coupled to the power supply, the emitter of the phototransistor Q1 is coupled to the resistor R19, and the end of the resistor R19 away from the phototransistor Q1 is grounded.
Through the technical scheme, when the current to be detected in the main circuit flows through the sampling resistor R24, a small voltage drop is formed at two ends of the resistor R24, the voltage is limited by the resistor R9 and then flows through the light emitting diode D1 in the optocoupler U3, and according to the photoelectric transmission characteristic of the optocoupler, the current on the output side is larger when the current on the input side is larger. The current of the light emitting diode D1 flows through the resistor R19, so that a voltage is formed on the resistor R19, the voltage is a function of the current in the main circuit, and the function is monotonically increasing, i.e., the larger the current in the main circuit, the larger the voltage on the resistor R19, and by detecting the voltage on the resistor R19, the current value in the main circuit can be obtained through corresponding calculation; the utility model discloses utilize the photoelectric transmission characteristic of opto-coupler, reachd the main circuit median current value to effectively reduce detection circuitry's cost, be convenient for use widely in numerous little electrical apparatus products.
Further, a resistor R2 is coupled to an emitter of the phototransistor Q1, a capacitor C5 is coupled to the other end of the resistor R2, and the other end of the capacitor C5 is grounded.
Through the technical scheme, the capacitor C5 and the resistor R2 form an RC filter circuit, and the stability of the collected voltage is improved.
Furthermore, the device also comprises a singlechip U2 and peripheral circuits thereof, wherein a pin 7 of the singlechip U2 is coupled to an electric connection point of a capacitor C5 and a resistor R2.
Through the technical scheme, an A/D converter in the single chip microcomputer U2 converts an analog signal between the capacitor C5 and the resistor R2 into a digital quantity, and the magnitude of the current to be tested in the main circuit is calculated through the MCU.
Furthermore, an emitter of the phototriode Q1 is also coupled with an alarm module;
and when the amplified signal is greater than the preset value, the alarm module gives an alarm.
Through the technical scheme, when the current in the main circuit is too large, the alarm module is used for alarming, and the safety of the main circuit is improved.
Further, the alarm module comprises a comparator U4, a positive phase terminal of the comparator U4 is coupled to an emitter of a phototransistor Q1, a negative phase terminal of the comparator U4 is coupled to a resistor R20 and a resistor R21, the other terminal of the resistor R20 is grounded, the other terminal of the resistor R21 is coupled to a power supply, an output terminal of the comparator U4 is coupled to a base of a transistor Q2, a collector of the transistor Q2 is coupled to an alarm SP, the other terminal of the alarm SP is coupled to the power supply, and an emitter of the transistor Q2 is grounded.
Through the technical scheme, the comparator U4 collects the emitter voltage signal of the phototriode Q1 and compares the emitter voltage signal with a preset voltage value, if the received voltage signal is larger than the preset value, the comparator U4 outputs an electric signal to the triode Q2, and the alarm SP is electrified to work.
Further, the alarm SP is a buzzer.
Through the technical scheme, the buzzer is used for early warning to remind a user that the current in the main circuit is too large.
Further, a voltmeter is connected in parallel to the resistor R19.
Through the technical scheme, the voltmeter is convenient for reading out the voltage at the two ends of the resistor R19, and then the current value in the main circuit is calculated through a corresponding formula.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the current value in the main circuit is detected by utilizing the photoelectric transmission characteristic of the optocoupler, so that the cost of the detection circuit is reduced, and the detection circuit is economical, practical and convenient to popularize and use in numerous small electric appliance products;
(2) furthermore, the measuring range of the measured current is adjusted by adjusting the resistance values of the resistor R24 and the resistor R19, so that the applicability is strong; through setting up resistance R2 and electric capacity C2, the filtering effect of reinforcing current signal improves the stability of gathering the voltage.
Drawings
Fig. 1 is a circuit diagram of a first embodiment of the present invention;
fig. 2 is a circuit diagram of a second embodiment of the present invention.
Reference numerals: 1. a main circuit; 2. a voltage stabilization module; 3. an alarm module; 4. a voltmeter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following provides a further detailed description of the present invention with reference to the following embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example one
As shown in fig. 1, an optical coupler detection current circuit for detecting current in a main circuit 1 includes a sampling resistor R24, an optical coupler U3 and a voltage dividing resistor R19 coupled in the main circuit 1, the optical coupler U3 includes a light emitting diode D1 and a photo transistor Q1, and the photo transistor Q1 is controlled by the light emitting diode D1;
the cathode of the light emitting diode D1 is a pin 1 of the optocoupler U3 and is coupled to one end of the resistor R24, the anode of the light emitting diode D1 is a pin 2 of the optocoupler U3 and is coupled to the resistor R9, and one end of the resistor R9, which is far away from the light emitting diode D1, is coupled to the other end of the resistor R24;
the collector of the phototriode Q1 is 3 pins of the optocoupler U3 and is coupled with a power supply, the emitter of the phototriode Q1 is 4 pins of the optocoupler U3 and is coupled with a resistor R19, and one end of the resistor R19 far away from the phototriode Q1 is grounded.
When the current to be detected in the main circuit 1 flows through the sampling resistor R24, a small voltage drop is formed across the sampling resistor R24, the voltage is limited by the resistor R9 and then flows through the light emitting diode D1, and the current on the output side is increased when the current on the input side is increased due to the photoelectric transmission characteristics of the optical coupler. The current in the phototransistor Q1 in the optocoupler U3 flows through the resistor R19, so that a voltage is developed across the resistor R19 which is a function of the input side current and which is monotonically increasing, i.e. the larger the input side current, the larger the voltage across the resistor R19. After the voltage of the resistor R19 is detected, the corresponding current value in the main circuit 1 is obtained through the corresponding calculation formula.
An emitter of the phototriode Q1 is coupled with a resistor R2, the other end of the resistor R2 is coupled with a capacitor C5, the other end of the capacitor C5 is grounded, and the stability of the acquired voltage is improved through RC filtering.
A singlechip U2 and a peripheral circuit thereof are further coupled between the capacitor C5 and the resistor R2, the singlechip U2 is an MCU singlechip, a voltage input pin (pin 7) of the singlechip U2 is coupled with an electric connection point of the capacitor C5 and the resistor R2, a pin 8 of the singlechip U2 is grounded, and a pin 9 of the singlechip U2 is connected with a power supply. When the testing device is used, the single chip microcomputer U2 collects a voltage signal on the R19, an A/D converter in the single chip microcomputer U2 converts an analog signal into a digital quantity, and the MCU single chip microcomputer calculates the magnitude of a tested current in the main circuit 1.
The emitter of the phototriode Q1 is also coupled with an alarm module 3, and when the amplified signal is greater than a preset value, the alarm module 3 gives an alarm. The alarm module 3 comprises a comparator U4, wherein a positive phase end of the comparator U4 is coupled with an emitter of a phototriode Q1, a negative phase end of the comparator U4 is coupled with a resistor R20 and a resistor R21, the other end of the resistor R20 is grounded, the other end of the resistor R21 is coupled with a power supply, an output end of the comparator U4 is coupled with a base of a triode Q2, a collector of the triode Q2 is coupled with an alarm SP, the alarm SP is a buzzer, the other end of the alarm SP is coupled with the power supply, and an emitter of the triode Q2 is grounded. During the use, the voltage signal of the projecting pole of photo transistor Q1 is gathered to comparator U4 to compare with predetermineeing the voltage signal, if the voltage signal is too big, then the electric current in main circuit 1 is too big, and the output of comparator U4 output signal of telecommunication to triode Q2 department, switch on electric current, alarm SP work reminds user's main circuit 1 electric current too big.
Example two
An optical coupler detection current circuit is shown in fig. 2, and is different from the first embodiment in that a voltmeter 4 is connected in parallel to a resistor R19, the voltage on R19 is read through the voltmeter 4, and the current value in a main circuit 1 is calculated by using a corresponding calculation formula.
In summary, the following steps:
when the utility model is used, the photoelectric transmission characteristic of the optocoupler is utilized to detect the current value in the main circuit 1, thereby reducing the cost of the detection circuit, being economical and practical and being convenient for popularization and use in numerous small electric appliance products; the measuring range of the measured current in the main circuit 1 is adjusted by adjusting the resistance values of the resistor R24 and the resistor R19, so that the applicability of the utility model is enhanced; in addition, the filtering effect of the output current signal can be easily adjusted by adjusting the parameters of the resistor R2 and the capacitor C2, and the stability of the acquisition voltage is improved.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An optical coupler detection current circuit is used for detecting current in a main circuit (1), and is characterized by comprising a sampling resistor R24, an optical coupler U3 and a voltage division resistor R19 which are coupled in the main circuit (1), wherein the optical coupler U3 comprises a light emitting diode D1 and a phototriode Q1, and the phototriode Q1 is controlled by the light emitting diode D1;
the cathode of the led D1 is coupled to one end of the resistor R24, the anode of the led D1 is coupled to the resistor R9, and the resistor R9 is coupled to the other end of the resistor R24;
the collector of the phototransistor Q1 is coupled to the power supply, the emitter of the phototransistor Q1 is coupled to the resistor R19, and the end of the resistor R19 away from the phototransistor Q1 is grounded.
2. The optical coupler detection current circuit as claimed in claim 1, wherein a resistor R2 is coupled to an emitter of the phototransistor Q1, a capacitor C5 is coupled to the other end of the resistor R2, and the other end of the capacitor C5 is grounded.
3. The optical coupler detection current circuit as claimed in claim 2, further comprising a single chip microcomputer U2 and its peripheral circuits, wherein a voltage input pin of the single chip microcomputer U2 is coupled to an electrical connection point of a capacitor C5 and a resistor R2.
4. The optocoupler detection current circuit according to claim 1, wherein an alarm module (3) is further coupled to an emitter of the phototransistor Q1;
and when the amplified signal is greater than the preset value, the alarm module (3) gives an alarm.
5. The optocoupler detection current circuit according to claim 4, wherein the alarm module (3) comprises a comparator U4, a positive phase terminal of the comparator U4 is coupled to an emitter of a phototransistor Q1, a negative phase terminal of the comparator U4 is coupled to a resistor R20 and a resistor R21, the other terminal of the resistor R20 is grounded, the other terminal of the resistor R21 is coupled to a power supply, an output terminal of the comparator U4 is coupled to a base of a transistor Q2, a collector of the transistor Q2 is coupled to an alarm SP, the other terminal of the alarm SP is coupled to the power supply, and the emitter of the transistor Q2 is grounded.
6. The optocoupler detection current circuit according to claim 5, wherein the alarm SP is a buzzer.
7. An optocoupler detection current circuit according to claim 2, characterized in that the resistor R19 is connected in parallel with a voltmeter (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920261099.9U CN209821274U (en) | 2019-02-28 | 2019-02-28 | Optical coupler detection current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920261099.9U CN209821274U (en) | 2019-02-28 | 2019-02-28 | Optical coupler detection current circuit |
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| CN209821274U true CN209821274U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504747A (en) * | 2021-06-23 | 2021-10-15 | 犇畅电子科技(苏州)有限公司 | Optical coupling control detection equipment of screw permutation machine |
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2019
- 2019-02-28 CN CN201920261099.9U patent/CN209821274U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504747A (en) * | 2021-06-23 | 2021-10-15 | 犇畅电子科技(苏州)有限公司 | Optical coupling control detection equipment of screw permutation machine |
| CN113504747B (en) * | 2021-06-23 | 2023-02-21 | 犇畅电子科技(苏州)有限公司 | Optical coupling control detection equipment of screw permutation machine |
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