CN219799594U - AC/DC dual-purpose control input detection circuit - Google Patents
AC/DC dual-purpose control input detection circuit Download PDFInfo
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- CN219799594U CN219799594U CN202223558999.0U CN202223558999U CN219799594U CN 219799594 U CN219799594 U CN 219799594U CN 202223558999 U CN202223558999 U CN 202223558999U CN 219799594 U CN219799594 U CN 219799594U
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Abstract
The utility model relates to an alternating current/direct current dual-purpose control input detection circuit which is low in cost, small in size, low in power consumption, high in line crosstalk resistance and capable of achieving alternating current/direct current dual-purpose. The advantages are that: the comparator in the circuit can control the output state of the optocoupler according to the comparison result after comparing the voltage of the load resistor end in the low-pass filter circuit with the reference voltage signal, so that the circuit not only can be used for alternating current and direct current, but also has small volume and low power consumption; the low-pass filter circuit in the circuit is composed of the current-limiting resistor, the load resistor and the filter capacitor, so that the heating value of the circuit can be reduced, the performance of the circuit for resisting the induced current interference can be improved, and meanwhile, the production cost of the circuit can be reduced.
Description
Technical Field
The utility model belongs to the technical field of control input devices, and particularly relates to an alternating current/direct current dual-purpose control input detection circuit.
Background
With the development and popularization of automation and intelligent technologies, the traditional electric control circuit mainly comprising a relay is gradually changed into a PLC (programmable logic controller), a singlechip and an industrial personal computer as core control circuits, wherein the traditional electric control voltage signals basically adopt 220V alternating current or 380V alternating current signals (the common control input devices in the conventional electric circuits are provided with devices such as a switch, a relay, an alternating current contactor and the like, and the traditional electric control circuit has the advantages of large control current, voltage isolation, interference resistance and the like, but also has the advantages of large volume, low switching speed and high control voltage); but the relay has the defects of larger volume, easy fault occurrence during frequent state switching, relatively higher cost of the complex wiring controller due to the adoption of the low-voltage communication line, and the like.
In the prior art, an optocoupler and a transformer method are also adopted to convert a high-voltage alternating current signal into a low-voltage signal, but the transformer is large in size, the optocoupler is small in size, but a basic element is a low-voltage device, and a large resistor is required to conduct current limiting during high voltage, so that power is mainly concentrated on the current limiting resistor, the stable working current of the optocoupler is not small, and a large heat dissipation space is required for the current limiting resistor. This is not true for heat-generating, more sensitive appliances. And the optocoupler is easy to influence due to individual difference and temperature, and the working current range of the optocoupler is wide in dispersion, so that the optocoupler is easy to be interfered by line induced current.
Thus, there are currently generally two versions of the same function electrical device, a low voltage DC control input and a 220V/380V AC control input, depending on the direction of the control input signal.
Disclosure of Invention
The design purpose is as follows: in order to avoid the defects in the background technology, an AC/DC dual-purpose control input detection circuit with low cost, small volume, low power consumption and strong line crosstalk resistance is designed.
The design scheme is as follows: to achieve the above design objective.
1. The circuit comprises a low-pass filter circuit, a reference voltage signal, a comparator and an optocoupler, wherein the comparator can control the output state of the optocoupler according to a comparison result after comparing the voltage of a load resistor end in the low-pass filter circuit with the reference voltage signal. The purpose of this design is: the circuit comprises a low-pass filter circuit, a reference voltage signal, a comparator and an optocoupler, wherein the comparator can control the output state of the optocoupler according to a comparison result after comparing the voltage of a load resistor end in the low-pass filter circuit with the reference voltage signal, so that the circuit not only can be used for alternating current and direct current, but also can reduce the volume and the power consumption of the circuit.
2. The low-pass filter circuit is composed of a current-limiting resistor, a load resistor and a filter capacitor, wherein the end A of the current-limiting resistor, the end A of the load resistor and the end A of the filter capacitor are mutually connected, and the end B of the load resistor and the end B of the filter capacitor are mutually connected. The purpose of this design is: the low-pass filter circuit consists of a current-limiting resistor, a load resistor and a filter capacitor, wherein the end A of the current-limiting resistor, the end A of the load resistor and the end A of the filter capacitor are connected with each other, the end B of the load resistor and the end B of the filter capacitor are connected with each other, the current-limiting resistor and the load resistor determine the voltage division value when the direct current voltage is input, and when 50Hz/60Hz or crosstalk electric signals are input, the filter capacitor participates in voltage division to reduce the voltage; therefore, the heating value of the circuit can be reduced, the performance of the circuit for resisting the induced current interference can be improved, and meanwhile, the production cost of the circuit can be reduced.
3. The anode end of the voltage-stabilizing diode, the B end of the load resistor and the B end of the filter capacitor are mutually connected, and the design that the cathode end of the voltage-stabilizing diode, the A end of the current-limiting resistor, the A end of the load resistor and the A end of the filter capacitor are mutually connected is the third technical feature of the utility model. The purpose of this design is: the voltage stabilizing diode is characterized in that the anode end of the voltage stabilizing diode, the B end of the load resistor and the B end of the filter capacitor are connected with each other, the cathode end of the voltage stabilizing diode, the A end of the current limiting resistor, the A end of the load resistor and the A end of the filter capacitor are connected with each other, and the voltage stabilizing diode is arranged to realize the clamping of output voltages at the two ends of the load resistor, so that the amplifier is protected.
4. The anode end of the diode is connected with the A end of the current-limiting resistor, and the design that the cathode end of the diode, the cathode end of the voltage-stabilizing diode, the A end of the load resistor and the A end of the filter capacitor are mutually connected is the fourth technical feature of the utility model. The purpose of this design is: the anode end of the diode is connected with the A end of the current limiting resistor, the cathode end of the diode, the cathode end of the voltage stabilizing diode, the A end of the load resistor and the A end of the filter capacitor are connected with each other, the diode is arranged, the diode can conduct half-wave rectification on alternating current when the input signal is an alternating current input signal, and the diode can play a role in protecting the direction of input voltage on the direct current input signal when the input signal is a direct current input signal.
The technical scheme is as follows: the utility model provides a dual-purpose control input detection circuitry of alternating current-direct current, includes low pass filter circuit, reference voltage signal, comparator and opto-coupler, the comparator can be according to the output state of comparison result control opto-coupler after comparing the voltage of the load resistance end in the low pass filter circuit with reference voltage signal.
Compared with the background technology, the utility model has the advantages that firstly, the comparator in the AC/DC dual-purpose control input detection circuit can control the output state of the optocoupler according to the comparison result after comparing the voltage of the load resistor end in the low-pass filter circuit with the reference voltage signal, so that the circuit not only can be used for AC/DC, but also has small volume and low power consumption; the low-pass filter circuit in the AC/DC control input detection circuit is composed of a current-limiting resistor, a load resistor and a filter capacitor, so that the heating value of the circuit can be reduced, the resistance of the circuit to induced current interference can be improved, and the production cost of the circuit can be reduced; the voltage stabilizing diode and the diode in the AC/DC dual-purpose control input detection circuit can greatly improve the use safety and the use reliability of the circuit, thereby greatly prolonging the service life of the circuit.
Drawings
Fig. 1 is a schematic diagram of an ac/dc control input detection circuit.
Detailed Description
Example 1: reference is made to figure 1. The utility model provides an alternating current-direct current dual-purpose control input detection circuit, includes low pass filter circuit, reference voltage signal 10, comparator 6 and opto-coupler 8, comparator 6 can be according to the output state of comparison result control opto-coupler 8 after comparing the voltage of the load resistance 3 end in the low pass filter circuit with reference voltage signal 10, and the one end of opto-coupler current-limiting resistor 9 is connected with the output of comparator 6, and the other end is connected with the input of opto-coupler 8. The low-pass filter circuit is composed of a current-limiting resistor 1, a load resistor 3 and a filter capacitor 4, wherein the end A of the current-limiting resistor 1, the end A of the load resistor 3 and the end A of the filter capacitor 4 are connected with each other, and the end B of the load resistor 3 and the end B of the filter capacitor 4 are connected with each other; when the direct current voltage is input, the voltage dividing value is determined by the current limiting resistor 1 and the load resistor 3, and when 50Hz/60Hz or crosstalk electric signals are input, the filter capacitor 4 participates in voltage division, so that the voltage of the filter capacitor is reduced. The output state of the optocoupler 8 reflects the input state. When the input end of the low-pass filter circuit is input with direct-current voltage or alternating-current voltage, the voltage of the end of the load resistor 3 in the low-pass filter circuit is compared with the reference voltage signal 10, and when the voltage of the end of the load resistor 3 is greater than the reference voltage, the output end of the optocoupler 8 is in a conducting state.
The voltage stabilizing diode (5) is further included, the anode end of the voltage stabilizing diode (5), the B end of the load resistor (3) and the B end of the filter capacitor (4) are connected with each other, and the cathode end of the voltage stabilizing diode (5), the A end of the current limiting resistor (1), the A end of the load resistor (3) and the A end of the filter capacitor (4) are connected with each other. The current limiting resistor is characterized by further comprising a diode 2, wherein the anode end of the diode 2 is connected with the end A of the current limiting resistor 1, and the cathode end of the diode 2, the end A of the load resistor 3 and the end A of the filter capacitor 4 are connected with each other. The LED further comprises a diode 2, wherein the anode end of the diode 2 is connected with the A end of the current limiting resistor 1, and the cathode end of the diode 2, the cathode end of the zener diode 5, the A end of the load resistor 3 and the A end of the filter capacitor 4 are connected with each other.
The circuit also comprises an isolation power supply 7, wherein the isolation power supply 7 supplies power for the comparator 6, the optocoupler 8 and the reference voltage signal 10 generating circuit. The model of the diode 2 is SM4007PL; the resistance of the load resistor 3 is 33KΩ; the filter capacitor 4 is 220nF; the model of the zener diode 5 is BZT52C4V3; the comparator 6 is an LM2903 low-power-consumption dual-voltage comparator, and has a model which can be LM2903AM8-13; the model number of the optocoupler 8 is TLP291. The reference voltage signal 10 is formed by dividing a supply voltage by two resistors.
It should be understood that: although the above embodiments describe the design concept of the present utility model in more detail, these descriptions are merely descriptions of the design concept of the present utility model, and not limitations on the design concept of the present utility model, and any combination, addition or modification not exceeding the design concept of the present utility model falls within the scope of the present utility model.
Claims (7)
1. An AC/DC control input detection circuit is characterized in that: the low-pass filter circuit comprises a low-pass filter circuit, a reference voltage signal (10), a comparator (6) and an optocoupler (8), wherein the comparator (6) can control the output state of the optocoupler (8) according to a comparison result after comparing the voltage of a load resistor (3) end in the low-pass filter circuit with the reference voltage signal (10).
2. The ac/dc control input detection circuit of claim 1, wherein: the low-pass filter circuit is composed of a current-limiting resistor (1), a load resistor (3) and a filter capacitor (4), wherein the end A of the current-limiting resistor (1), the end A of the load resistor (3) and the end A of the filter capacitor (4) are connected with each other, and the end B of the load resistor (3) and the end B of the filter capacitor (4) are connected with each other.
3. The ac/dc control input detection circuit of claim 2, wherein: the voltage stabilizing diode (5) is characterized by further comprising an anode end of the voltage stabilizing diode (5), a B end of the load resistor (3) and a B end of the filter capacitor (4) which are connected with each other, and a cathode end of the voltage stabilizing diode (5), an A end of the current limiting resistor (1), an A end of the load resistor (3) and an A end of the filter capacitor (4) which are connected with each other.
4. An ac/dc control input detection circuit according to claim 3, wherein: the current limiting resistor is characterized by further comprising a diode (2), wherein the anode end of the diode (2) is connected with the end A of the current limiting resistor (1), and the cathode end of the diode (2), the end A of the load resistor (3) and the end A of the filter capacitor (4) are connected with each other.
5. The ac/dc control input detection circuit of claim 2, wherein: the LED further comprises a diode (2), wherein the anode end of the diode (2) is connected with the A end of the current-limiting resistor (1), and the cathode end of the diode (2), the cathode end of the voltage-stabilizing diode (5), the A end of the load resistor (3) and the A end of the filter capacitor (4) are connected with each other.
6. The ac/dc control input detection circuit of claim 1, wherein: the reference voltage signal (10) is formed by dividing a supply voltage by two resistors.
7. The ac/dc control input detection circuit of claim 1, wherein: the circuit also comprises an isolation power supply (7), wherein the isolation power supply (7) supplies power for the comparator (6), the optocoupler (8) and the reference voltage signal (10) generating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223558999.0U CN219799594U (en) | 2022-12-30 | 2022-12-30 | AC/DC dual-purpose control input detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223558999.0U CN219799594U (en) | 2022-12-30 | 2022-12-30 | AC/DC dual-purpose control input detection circuit |
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| Publication Number | Publication Date |
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| CN219799594U true CN219799594U (en) | 2023-10-03 |
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| CN202223558999.0U Active CN219799594U (en) | 2022-12-30 | 2022-12-30 | AC/DC dual-purpose control input detection circuit |
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| CN (1) | CN219799594U (en) |
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- 2022-12-30 CN CN202223558999.0U patent/CN219799594U/en active Active
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