CN217883395U - Isolation device and electronic equipment - Google Patents
Isolation device and electronic equipment Download PDFInfo
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- CN217883395U CN217883395U CN202222026997.0U CN202222026997U CN217883395U CN 217883395 U CN217883395 U CN 217883395U CN 202222026997 U CN202222026997 U CN 202222026997U CN 217883395 U CN217883395 U CN 217883395U
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Abstract
The embodiment of the utility model provides an isolating device and electronic equipment designs power technical field. The isolation device comprises an isolation module, a first resistor, a second resistor and a switch device, wherein the isolation module, the first resistor and the switch device are electrically connected in sequence; one end of the second resistor is electrically connected between the isolation module and the first resistor, and the other end of the second resistor is grounded. The resistance value of the first resistor and the resistance value of the second resistor meet a first preset condition, so that when the input signal is low level, the isolation module is in an amplification state, and the switching device is in a saturation state. Because the resistance of the first resistor and the resistance of the second resistor meet the first preset condition, when the input signal is at a low level, the isolation module is in an amplification state, even if the isolation module is interfered, the conduction current is reduced, the switch device is still in a saturation state, and the low level is output, so that the anti-interference capability of the isolation module is improved.
Description
Technical Field
The utility model relates to a power technical field particularly, relates to an isolating device and electronic equipment.
Background
To some circuits, for example electric pulse circuit, external module circuit, RS485 circuit etc. can with human direct contact among the practical application process, for avoiding taking place to electrocute danger, use the opto-coupler to carry out electrical isolation usually among the circuit design.
Because the opto-coupler is through the transmission of photoelectricity medium, when there is interference in the outside, for example radio interference, or when other influences such as ambient temperature change, the influence is received easily to opto-coupler transmission ratio for the conduction current of opto-coupler reduces, thereby leads to signal transmission failure.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model includes, for example, provide an isolating device, its interference killing feature that can improve isolation module for isolation module is receiving the interference, when leading to the high pass current to reduce, still makes the triode be in saturation state, thereby realizes signal transmission.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides an isolation device, which includes an isolation module, a first resistor, a second resistor, and a switch device, where the isolation module, the first resistor, and the switch device are electrically connected in sequence; one end of the second resistor is electrically connected between the isolation module and the first resistor, and the other end of the second resistor is grounded; the isolation module comprises a signal input for receiving an input signal, and the switching device comprises a signal output for generating an output signal;
the isolation module is used for generating conduction current when the input signal is at a low level so as to enable the switching device to generate a low level; and is cut off when the input signal is at high level, so that the switching device generates high level;
the resistance value of the first resistor and the resistance value of the second resistor meet a first preset condition, so that when the input signal is at a low level, the isolation module is in an amplification state, and the switching device is in a saturation state.
In one possible embodiment, the isolation module comprises a light-emitting element and a photosensor, the anode of the light-emitting element is electrically connected to the first power supply element, and the cathode is electrically connected to the signal input; one end of the photoelectric sensor is electrically connected with the second power supply element, and the other end of the photoelectric sensor is electrically connected with the first resistor;
the light-emitting element is used for being switched on when the input signal is at a low level and generating an optical signal, and being switched off when the input signal is at a high level;
the photoelectric sensor is used for generating conduction current when sensing the optical signal; and, turning off when the optical signal is not sensed.
In a possible embodiment, the isolation device further comprises a third resistor; the switch device comprises a control end, a first contact and a second contact, and the photoelectric sensor, the first resistor and the control end are electrically connected in sequence; one end of the second resistor is electrically connected between the photoelectric sensor and the first resistor, and the other end of the second resistor is grounded; the second contact is grounded; the first contact is connected with the third resistor in series and connected with a third power supply element, and the signal output end is formed between the first contact and the third resistor; the resistance value of the third resistor meets a second preset condition, so that when the switching device is in a saturated state, the signal output end generates a low level.
In a possible embodiment, the first preset condition is:
R1<(V2-V BE )/(I 1 -V2/R2)；
wherein R1 is a resistance value of the first resistor, R2 is a resistance value of the second resistor, V2 is a voltage of the second power supply element, V BE For the voltage between the control terminal and the first contact when said switching device is switched on, I 1 Is the maximum current when the photoelectric sensor is conducted。
In a possible embodiment, the second preset condition is:
R3>V3/(I B x a); wherein, I B ＝(I 2 *R2-V BE )/(R1+R2)；
Wherein R3 is the resistance of the third resistor, V3 is the voltage of the third power supply element, I B Is the current of the control end of the switching device, and A is the amplification factor of the switching device; i is 2 R1 is the first resistor, and R2 is the second resistor, which are the minimum current when the photosensor is turned on.
In a possible implementation manner, the isolation device further includes a fourth resistor and a capacitor, and the photosensor, the fourth resistor and the first resistor are electrically connected in sequence; one end of the capacitor is electrically connected between the photoelectric sensor and the first resistor, and the other end of the capacitor is grounded.
In a possible embodiment, the isolation device further includes a fifth resistor, and the cathode of the light emitting diode is connected in series with the fifth resistor to the signal input terminal.
In one possible embodiment, the isolation module is an optical coupler or a capacitive isolator.
In one possible embodiment, the switching device is a transistor or a MOS transistor.
In a second aspect, the embodiments of the present invention further provide an electronic device, which includes the isolating device as described above.
Compared with the prior art, the embodiment of the utility model provides an isolating device and electronic equipment, isolating device includes isolation module, first resistance, second resistance and switching element, and isolation module, first resistance and switching element are connected electrically in proper order; one end of the second resistor is electrically connected between the isolation module and the first resistor, and the other end of the second resistor is grounded. The resistance value of the first resistor and the resistance value of the second resistor meet a first preset condition, so that when the input signal is low level, the isolation module is in an amplification state, and the switching device is in a saturation state. When the input signal is at low level, the isolation module generates on-current to enable the switch device to generate low level, and when the input signal is at high level, the isolation module is cut off to enable the switch device to generate high level, so that signal transmission is realized. Because the resistance of the first resistor and the resistance of the second resistor meet the first preset condition, when the input signal is at a low level, the isolation module is in an amplification state, and therefore, even if the isolation module is interfered, the conduction current is reduced, the switch device is still in a saturation state, and the low level is output, so that the anti-interference capability of the isolation module is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a first isolation device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second isolation device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an isolation device according to an embodiment of the present invention.
Fig. 4 is a second schematic structural diagram of an isolation device according to an embodiment of the present invention.
Fig. 5 is a third schematic structural diagram of an isolation device according to an embodiment of the present invention.
Fig. 6 is a fourth schematic structural diagram of an isolation device according to an embodiment of the present invention.
Fig. 7 is a fifth schematic structural view of an isolation device according to an embodiment of the present invention.
Fig. 8 is a sixth schematic structural view of an isolation device according to an embodiment of the present invention.
Icon: 10-a first isolation device; 20-a second isolation device; 30-an isolation device; 310-an isolation module; 320-a switching device; 330-signal input; 340-signal output; 350-a first supply element; 360-a second supply element; 370-third supply element.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
For some circuits, such as an electric pulse circuit, an external module circuit, an RS485 circuit, MBUS, a P1 port and the like, the circuits can be in direct contact with a human body in the practical application process, and in order to avoid electric shock hazard, an optical coupler is usually used for electrical isolation in circuit design.
Referring to fig. 1, fig. 1 shows a circuit diagram of a first isolation device 10, which includes an optical coupler and a resistor R x And a resistance R y . The optical coupler includes luminescenceAn element D1 and a photoelectric sensor Q1, wherein the anode of the light emitting element is electrically connected with a 3.3V power supply VCC, and the cathode is connected in series with a resistor R with the resistance of 1k omega x Is connected with the signal input end. The signal input end is used for inputting high and low levels. One end of the photoelectric sensor Q1 is connected with a 5v power supply VDD, and the other end is connected with a 1k omega resistor R in series y And is grounded and forms a signal output terminal between the photosensor and the resistor.
When the input signal is at a low level, the light emitting element is turned on and the current is about 2mA. Under the condition of normal temperature, the transmission ratio of the optical coupler is calculated according to 300%, the current of the photoelectric sensor is 2mA × 300% =6mA,6mA >, 5V/1k omega, therefore, the optical coupler is in a switch state, and the signal output end outputs a low level.
Under the high temperature condition, opto-coupler transmission ratio diminishes, calculates according to 180%, and then photoelectric sensor's electric current is 2mA 180% <5V/1k omega, and the opto-coupler is in the enlarged state, and signal output can't export the low level, leads to signal transmission failure.
In view of the above problems of the first isolation device 10, a second isolation device 20 appears in the market, a circuit diagram of the second isolation device 20 is shown in fig. 2, a shaping circuit is added on the basis of the first isolation device 10 shown in fig. 1, an optical coupler portion of the shaping circuit is the same as the first isolation device 10 in fig. 1, and details are not repeated here.
The shaping circuit comprises a resistor Rn with the resistance value of 4.7k omega, a resistor Rm with the resistance value of 430 omega and a triode Q2, so that the optocoupler is in an amplification state. A terminal 3 of the photoelectric sensor Q1 is connected with a resistor Rn in series and is connected with a base electrode of the triode Q2, one end of the resistor Rm is electrically connected between the photoelectric sensor Q1 and the resistor Rn, and the other end of the resistor Rm is grounded. The emitter E of the triode Q2 is grounded, and the collector C is connected with a power supply VDD.
When an input signal is at a low level, the current of the light-emitting element is 2mA, the transmission ratio of the optical coupler is calculated according to 300%, the voltage of a terminal 3 of the photoelectric sensor Q1 is about 2mA, 300%, 430 omega =2.6V and is restricted to 5V, the optical coupler is in an amplification state at the moment, the resistor Rm provides conduction voltage for the triode Q2, the triode Q2 is in a saturation state, and therefore the low level is output at a signal output end, and signal transmission is achieved.
When the optocoupler is interfered, the current of the photoelectric sensor Q1 is smaller than 1.5mA, so that the voltage of the terminal 3 is smaller than 0.7V, the current is not enough to maintain the conduction of the triode Q2, the triode Q2 is turned off, the signal output end outputs high level, and the signal transmission fails.
Aiming at the problem that the optical coupler is interfered in the first isolating device 10, so that the optical coupler is changed from a saturation state to an amplification state, and a high level is output at an output signal output end; and, the second isolation device 20 has a problem that the output current of the optocoupler is reduced, so that the transistor Q2 is turned off, and further the output signal output end outputs a high level. This embodiment provides an isolating device, its interference killing feature that can improve isolation module for isolation module is receiving the interference, when leading to high-pass current to reduce, makes the opto-coupler be in the enlarged state all the time, and makes the triode be in saturated condition, thereby realizes signal transmission.
On the basis of the above, please refer to fig. 3, fig. 3 shows a schematic structural diagram of the isolation device 30 provided in this embodiment. The circuit comprises an isolation module 310, a first resistor R1, a second resistor R2 and a switching device 320, wherein the isolation module 310, the first resistor R1 and the switching device 320 are electrically connected in sequence. One end of the second resistor R2 is electrically connected between the isolation module 310 and the first resistor R1, and the other end is grounded. The isolation device 30 further comprises a signal input 330 for receiving an input signal and a signal output 340 for generating an output signal, the signal input 330 being electrically connected to the isolation module 310, and the switching device 320 being electrically connected to the signal output 340.
An isolation module 310, configured to generate a conduction current when an input signal is at a low level, so that the switching device 320 generates a low level; and is turned off when the input signal is at a high level so that the switching device 320 generates a high level and outputs it through the signal output terminal 340.
The resistance of the first resistor R1 and the resistance of the second resistor R2 satisfy a first predetermined condition, so that when the input signal is at a low level, the isolation module 310 is in an amplification state, and the switching device 320 is in a saturation state.
Compared with the prior art, the isolating device provided by the embodiment meets a certain condition by adjusting the resistance values of the first resistor and the second resistor, so that the isolating module is always in an amplifying state and the switching device is always in a saturated state when the input signal is at a low level. Therefore, when the isolation device is interfered, even if the conduction current of the isolation device is reduced, the isolation module is still in an amplification state, and the switch device is still in a saturation state, so that a low level is generated at the signal output end 340, signal transmission is realized, and the anti-interference capability of the isolation device is improved.
Optionally, the isolation module is an optical coupler or a capacitive isolator.
Alternatively, please refer to fig. 4 on the basis of fig. 3. The isolation module 310 includes a light emitting element D1 and a photo sensor Q1, an anode of the light emitting element D1 is electrically connected to the first power supply element 350, and a cathode is electrically connected to the signal input end 330; one end of the photo sensor Q1 is electrically connected to the second power supply element 360, and the other end is electrically connected to the first resistor R1.
And a light emitting element D for being turned on when the input signal is a low level and generating an optical signal, and being turned off when the input signal is a high level.
The photoelectric sensor Q1 is used for generating conduction current when sensing an optical signal; and, cut off when no optical signal is sensed.
In this embodiment, the light emitting element D1 may be a light emitting diode, the photo sensor Q1 may be a photo transistor, a base B and a collector C of the photo transistor Q1 are electrically connected to the second power supply element 360, and the emitter E is electrically connected to the first resistor R1.
Optionally, please continue to refer to fig. 4. The isolation device 30 further comprises a third resistor R3; the switching device 320 comprises a control end 0, a first contact 1 and a second contact 2, and the photoelectric sensor Q1, the first resistor R1 and the control end 0 are electrically connected in sequence; one end of the second resistor R2 is electrically connected between the photoelectric sensor Q1 and the first resistor R1, and the other end is grounded; the second contact 2 is grounded; the first contact 1 is connected with a third resistor R3 in series and connected with a third power supply element 370, and a signal output end 340 is formed between the first contact 1 and the third resistor R3; the resistance of the third resistor R3 satisfies a second predetermined condition, so that the signal output terminal 340 generates a low level when the switching device 320 is in a saturation state.
In this embodiment, the third power supply element 370 and the second power supply element 360 may be the same power supply element or different power supply elements.
Optionally, the switching device is a triode or a MOS transistor.
In the present embodiment, referring to fig. 5, when the switching device 320 is a transistor Q2, the control terminal 0 is a base B, the first contact 1 is a collector C, and the second contact 2 is an emitter E. Referring to fig. 6, when the switching device is a MOS transistor, the control terminal 0 is a gate G, the first contact 1 is a drain D, and the second contact 2 is a source S.
Optionally, the first preset condition is: r1<(V2-V BE )/(I 1 -V2/R2)。
Wherein R1 is a resistance of the first resistor R1, R2 is a resistance of the second resistor R2, V2 is a voltage of the second power supply element 360, V BE Is the voltage between the control terminal 0 and the first contact 1 when the switching device 320 is turned on, I 1 The maximum current when the photosensor Q1 is on.
In the present embodiment, when setting the resistance value of R1, in order to ensure the switching speed of the isolation module, it is required to ensure that the isolation module 310 is in an amplification state, i.e., the voltage of the terminal 3 of the photo sensor Q1 is less than the voltage of the second power supply element 360.
Considering the critical value when the isolation module 310 is in the amplification state, that is, when the voltage of the terminal 3 of the photo sensor Q1 is equal to the voltage of the second power supply element 360, the corresponding resistance value of R1 is the upper limit of the resistance value of R1. Assuming that the voltage of the second power supply element 360 is V2 and the input signal is at low level, the current of the photo sensor Q1 is I 1 The upper limit of the resistance value of R1 is as follows: (V2-V) BE )/(I 1 -V2/R2)。
Wherein V BE The turn-on voltage of the switching device 320 is about 0.7V. When the switching device 320 is turned on, the voltage value of the control terminal 0 and the second contact 2 thereof is clamped at 0.7V.
For example, suppose V2 is 5V BE 0.7V, when the isolation device is not disturbed, the current I flowing through the photoelectric sensor 1 Is 6mA, R2 is 2kOmega, the upper limit of the resistance value of R1 is [5V-0.7V ]]/(6mA-5V/2kΩ)＝0.93kΩ。
Optionally, in order to ensure that the switching device 320 still operates in a saturation state and the signal output end 340 can output a signal correctly even when the isolation module is interfered, the first resistor R1, the second resistor R2, and the third resistor R3 further need to satisfy the following second preset condition.
The second preset condition is as follows:
R3>V3/(I B x a); wherein, I B ＝(I 2 *R2-V BE )/(R1+R2)；
Wherein R3 is the resistance of the third resistor, V3 is the voltage of the third power supply element 370, I B Is the current of the control end of the switching device, A is the amplification factor of the switching device; I.C. A 2 The minimum current when the photosensor is turned on is represented by R1, which is a first resistor, and R2, which is a second resistor.
In this embodiment, it is assumed that the resistance of the first resistor R1 is 51 Ω, the resistance of the second resistor R2 is 2k Ω, the voltage V3=5V of the third power supply module, and the amplification factor of the switching device 320 is 180. When the isolation module is interfered, the conduction current generated by the terminal 3 of the photoelectric sensor is I 2 ＝1mA，V BE It was 0.7V.
Approximate calculation of I B ＝1mA-0.7V/2kΩ＝0.65mA。
Then R3>V3/(I B ×A)＝5V/(0.65mA×180)＝42Ω。
It should be noted that since the resistance of the first resistor R1 is small and the voltage thereon is also small, I in the above example B =1mA-0.7V/2k Ω =0.65mA is only an approximate calculation. When the resistance value of the first resistor R1 is larger, the formula I is required B ＝(I 2 *R2-V BE ) /(R1 + R2) for accurate calculations.
Alternatively, when the wiring between the terminal 3 of the isolation module and the control terminal of the switching device 320 is too long, parasitic capacitance on the circuit is liable to form a loop. At this time, if there is a high-frequency magnetic field, an induced current will be generated on the high-frequency magnetic field, so that the transistor is turned on erroneously, and to avoid such a phenomenon, an RC circuit may be added to the circuit shown in fig. 4 to form a low-pass filter for filtering.
Therefore, on the basis of fig. 4, please refer to fig. 7, the isolation device 30 further includes a fourth resistor R4 and a capacitor C, and the photo sensor Q1, the fourth resistor R4 and the first resistor R1 are electrically connected in sequence; one end of the capacitor C is electrically connected between the photosensor Q1 and the first resistor R1, and the other end is grounded.
In this embodiment, in order to ensure the switching speed of the isolation module, the capacitor C should not be too large, for example, the value of the capacitor C may be 22pF.
Optionally, on the basis of fig. 7, referring to fig. 8, the isolation device 30 further includes a fifth resistor R5, and the cathode of the light emitting element D1 is connected in series with the fifth resistor R5 and connected to the signal input end 330.
Compared with the prior art, the PFC device provided in this embodiment, by adding the control module, can control the switching device to be turned off by detecting whether the PFC device is short-circuited, and when the PFC device is not short-circuited, control the switching device to be turned on and off, so as to ensure that the waveform of the voltage output by the PFC device is close to a square wave.
Compared with the prior art, the embodiment has the following beneficial effects:
first, the isolating device that this embodiment provided improves the interference killing feature of isolating the module through the resistance of adjustment first resistance and second resistance for isolating the module and receiving the interference, when leading to high-pass current to reduce, make the opto-coupler be in the enlarged state all the time, and make the triode be in saturated state, thereby realize signal transmission.
Then, an RC circuit is added to form a low-pass filter, so that when the wiring at the rear end of the isolation module is too long, interference is reduced, and normal transmission of signals is guaranteed.
The embodiment also provides an electronic device comprising the isolating device. The electronic device may be an electric energy meter or the like.
To sum up, the embodiment of the present invention provides an isolation device and an electronic apparatus, wherein the isolation device includes an isolation module, a first resistor, a second resistor and a switch device, and the isolation module, the first resistor and the switch device are electrically connected in sequence; one end of the second resistor is electrically connected between the isolation module and the first resistor, and the other end of the second resistor is grounded. The resistance value of the first resistor and the resistance value of the second resistor meet a first preset condition, so that when the input signal is in a low level, the isolation module is in an amplification state, and the switching device is in a saturation state. When the input signal is at low level, the isolation module generates on-current to enable the switch device to generate low level, and when the input signal is at high level, the isolation module is cut off to enable the switch device to generate high level, so that signal transmission is realized. Because the resistance of the first resistor and the resistance of the second resistor meet the first preset condition, when the input signal is at a low level, the isolation module is in an amplification state, and therefore, even if the isolation module is interfered, the conduction current is reduced, the switch device is still in a saturation state, and the low level is output, so that the anti-interference capability of the isolation module is improved.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An isolation device is characterized by comprising an isolation module, a first resistor, a second resistor and a switch device, wherein the isolation module, the first resistor and the switch device are electrically connected in sequence; one end of the second resistor is electrically connected between the isolation module and the first resistor, and the other end of the second resistor is grounded; the isolation device further comprises a signal input end for receiving input signals and a signal output end for generating output signals, the signal input end is electrically connected with the isolation module, and the switching device is electrically connected with the signal output end;
the isolation module is used for generating conduction current when the input signal is at a low level so as to enable the switching device to generate a low level; and when the input signal is at a high level, the switch device is cut off so that the switch device generates a high level and outputs the high level through the signal output end;
the resistance value of the first resistor and the resistance value of the second resistor meet a first preset condition, so that when the input signal is in a low level, the isolation module is in an amplification state, and the switching device is in a saturation state.
2. The isolation device of claim 1, wherein the isolation module further comprises a light emitting element and a photosensor, the anode of the light emitting element being electrically connected to the first power supply element, the cathode being electrically connected to the signal input; one end of the photoelectric sensor is electrically connected with the second power supply element, and the other end of the photoelectric sensor is electrically connected with the first resistor;
the light-emitting element is used for being switched on when the input signal is at a low level and generating an optical signal, and being switched off when the input signal is at a high level;
the photoelectric sensor is used for generating conduction current when sensing the optical signal; and, turning off when the optical signal is not sensed.
3. The isolation device of claim 2, further comprising a third resistor; the switch device comprises a control end, a first contact and a second contact, and the photoelectric sensor, the first resistor and the control end are electrically connected in sequence; one end of the second resistor is electrically connected between the photoelectric sensor and the first resistor, and the other end of the second resistor is grounded; the second contact is grounded; the first contact is connected with the third resistor in series and connected with a third power supply element, and the signal output end is formed between the first contact and the third resistor; the resistance value of the third resistor meets a second preset condition, so that when the switching device is in a saturation state, the signal output end generates a low level.
4. An isolation device as claimed in claim 3, wherein the first predetermined condition is:
R1<(V2-V BE )/(I 1 -V2/R2)；
wherein R1 is a resistance value of the first resistor, R2 is a resistance value of the second resistor, V2 is a voltage of the second power supply element, V BE For the voltage between the control terminal and the second contact when said switching device is switched on, I 1 The maximum current when the photoelectric sensor is conducted.
5. An isolation device as claimed in claim 3, wherein the second preset condition is:
R3>V3/(I B x a); wherein, I B ＝(I 2 ×R2-V BE )/(R1+R2)；
Wherein R3 is the resistance of the third resistor, V3 is the voltage of the third power supply element, I B Is the current of the control end of the switching device, and A is the amplification factor of the switching device; i is 2 R1 is the first resistor, and R2 is the second resistor, which are the minimum current when the photosensor is turned on.
6. The isolation device of claim 3, further comprising a fourth resistor and a capacitor, wherein the photosensor, the fourth resistor and the first resistor are electrically connected in sequence; one end of the capacitor is electrically connected between the photoelectric sensor and the first resistor, and the other end of the capacitor is grounded.
7. The isolation device of claim 2, further comprising a fifth resistor, wherein the cathode of the light emitting element is connected in series with the fifth resistor to the signal input terminal.
8. An isolation device as claimed in claim 1, wherein the isolation module is an opto-coupler or a capacitive isolator.
9. The isolation device of claim 7, wherein the switching device is a transistor or a MOS transistor.
10. An electronic device, characterized in that the electronic device comprises an isolation arrangement according to any of claims 1-9.
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| CN202222026997.0U CN217883395U (en) | 2022-07-29 | 2022-07-29 | Isolation device and electronic equipment |
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| CN202222026997.0U CN217883395U (en) | 2022-07-29 | 2022-07-29 | Isolation device and electronic equipment |
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| CN217883395U true CN217883395U (en) | 2022-11-22 |
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