CN220626544U - Detection circuit and device for constant current input port - Google Patents
Detection circuit and device for constant current input port Download PDFInfo
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- CN220626544U CN220626544U CN202321901190.5U CN202321901190U CN220626544U CN 220626544 U CN220626544 U CN 220626544U CN 202321901190 U CN202321901190 U CN 202321901190U CN 220626544 U CN220626544 U CN 220626544U
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Abstract
The utility model discloses a detection circuit and a device of a constant current input port, wherein the detection circuit of the constant current input port comprises: the device comprises a voltage control module, a power output module and a constant current output module, wherein the voltage control module is connected with an external detection product and is used for conducting isolation treatment on high-voltage input by the detection product through an isolation unit arranged in the voltage control module so as to output low-voltage isolation output voltage according to the isolation unit, the power output module is connected with the voltage control module and is used for conducting according to the isolation output voltage so as to output the isolation output voltage, and the constant current output module is connected with the power output module and is used for conducting stabilization treatment on output current according to the isolation output voltage so as to obtain and output target stable current. The utility model can protect the detection equipment by isolating the high-voltage input by the electronic equipment when detecting the constant-current input port.
Description
Technical Field
The utility model relates to the technical field of constant current input port testing, in particular to a detection circuit and device of a constant current input port.
Background
Before the electronic equipment provided with the constant current input port passes the factory inspection, the circuit state is uncertain, and the detection equipment can be damaged when the inspection is performed, so how to protect the detection equipment when the constant current input port is detected is a problem to be solved.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a detection circuit of a constant current input port, which can protect detection equipment by isolating high-voltage input by electronic equipment when the constant current input port is detected.
The utility model also provides a detection device of the constant current input port.
In a first aspect, an embodiment of the present utility model provides a detection circuit of a constant current input port, including:
the voltage control module is connected with an external detection product and is used for carrying out isolation treatment on high-voltage input by the detection product through an isolation unit built in the voltage control module so as to output low-voltage isolation output voltage according to the isolation unit;
the power supply output module is connected with the voltage control module and is used for conducting according to the isolation output voltage so as to output the isolation output voltage;
and the constant current output module is connected with the power supply output module and is used for stabilizing the output current according to the isolated output voltage to obtain and output a target stabilized current.
The detection circuit of the constant current input port has at least the following beneficial effects: the detection product inputs detection voltage to a detection circuit of a constant current input port so as to input the detection voltage to a voltage control module, the voltage control module performs isolation processing on the detection voltage input by the detection product through a built-in isolation unit so as to isolate high voltage contained in the detection voltage and output low-voltage isolated output voltage to a power output module, the power output module is conducted or turned off according to the isolated output voltage, if the power output module is conducted, the isolated output voltage is output to a constant current output module, and the constant current output module performs stabilization processing on output current according to the isolated output voltage so as to stabilize the output current to a fixed value, and thus a target stable current is obtained and output. The high-voltage input by the detection product is isolated through the built-in isolation unit of the voltage control module, the isolation output voltage is output to enable the power output module to be conducted, the constant current output module stabilizes the output current to the target stable current according to the isolation output voltage, and the high-voltage input by the electronic equipment can be isolated when the constant current input port is detected, so that the detection equipment is protected.
According to further embodiments of the present utility model, the detection circuit of the constant current input port, the voltage control module includes:
the controller is connected with the detection product and is used for receiving the high-voltage;
the isolation unit comprises an optical coupler, the optical coupler is connected with the controller and the power output module through a preset GPIO interface, the high-voltage is obtained through the GPIO interface, the high-voltage is isolated, and the isolated output voltage is obtained and output.
According to the detection circuit of the constant current input port of other embodiments of the present utility model, the optocoupler includes a first pin, a second pin, a third pin and a fourth pin, the optocoupler further includes a built-in optocoupler diode and an optocoupler triode, the first pin is connected with the anode of the optocoupler diode, the second pin is connected with the cathode of the optocoupler diode, the third pin is connected with the emitter of the optocoupler triode, and the fourth pin is connected with the collector of the optocoupler triode;
the first pin is connected with one end of an optocoupler current-limiting resistor, the other end of the optocoupler current-limiting resistor is connected with a first working voltage, and the first working voltage is used for controlling the conduction of the optocoupler diode;
the second pin is connected with the controller through a preset GPIO interface;
the third pin is connected with the power output module;
the fourth pin is connected with a second working voltage, and the second working voltage is used for controlling the conduction of the phototriode.
According to further embodiments of the present utility model, a detection circuit for a constant current input port, the power output module includes:
one end of the first current limiting resistor is connected with the third pin;
one end of the pull-down resistor is connected with the other end of the first current limiting resistor, and the other end of the pull-down resistor is grounded;
the isolating switch comprises an isolating MOS tube, a base electrode of the isolating MOS tube is connected between the first current limiting resistor and the pull-down resistor, a drain electrode of the isolating MOS tube is connected with the second working voltage, and the second working voltage is used for controlling the conducting of the isolating MOS tube;
one end of the protection resistor is connected with the source electrode of the isolation MOS tube, and the other end of the protection resistor is grounded;
and one end of the first filter capacitor is connected between the protection resistor and the source electrode of the isolation MOS tube, and the other end of the first filter capacitor is grounded.
According to further embodiments of the present utility model, a detection circuit for a constant current input port, the constant current output module includes:
the step-down resistor is connected with the source electrode of the isolation MOS tube;
the first bias resistor is connected between the step-down resistor and the source electrode of the isolation MOS tube;
the output control unit is connected with the step-down resistor and the first bias resistor;
one end of the second bias resistor is connected with the output control unit, and the other end of the second bias resistor is grounded;
and one end of the filter capacitor is connected with the output control unit, and the other end of the filter capacitor is grounded.
According to still further embodiments of the present utility model, the detection circuit of the constant current input port, the output control unit includes:
the base electrode of the first control triode is connected with the step-down resistor, the emitting electrode of the first control triode is connected with the first bias resistor, and the collecting electrode of the first control triode is connected with the second bias resistor;
the base of the second control triode is connected between the collector of the first control triode and the second bias resistor, the emitter of the second control triode is connected between the base of the first control triode and the step-down resistor, and the collector of the second control triode is connected to the filter capacitor.
According to further embodiments of the present utility model, a detection circuit of a constant current input port, the detection circuit further includes:
the current detection module is connected with the voltage control module and the constant current output module and is used for detecting the target stable current to obtain detection current, and the detection current is input to the voltage control module so that the voltage control module can finish detection according to the detection current.
According to further embodiments of the present utility model, a detection circuit of a constant current input port, the current detection module includes:
the current detection unit is connected with the constant current output module;
and one end of the equivalent load is connected with the current detection unit, and the other end of the equivalent load is grounded.
In a second aspect, an embodiment of the present utility model provides a detection apparatus for a constant current input port, including:
a detection circuit of a constant current input port, the detection circuit being as described in the first aspect.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a block diagram of a detection circuit for a constant current input port according to an embodiment of the present utility model;
FIG. 2 is a block diagram of another embodiment of a detection circuit for a constant current input port in an embodiment of the present utility model;
fig. 3 is a schematic circuit diagram of a specific embodiment of a detection circuit for a constant current input port according to an embodiment of the present utility model.
Reference numerals illustrate:
a voltage control module 101, a power output module 102, and a constant current output module 103;
a current detection module 201.
Detailed Description
The conception and the technical effects produced by the present utility model will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model.
In the description of the present utility model, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" on another feature, it can be directly disposed, secured, or connected to the other feature or be indirectly disposed, secured, connected, or mounted on the other feature.
In the description of the embodiments of the present utility model, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Before the electronic equipment provided with the constant current input port passes the factory inspection, the circuit state is uncertain, and the detection equipment can be damaged when the inspection is performed, so how to protect the detection equipment when the constant current input port is detected is a problem to be solved.
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a detection circuit of a constant current input port, which can protect detection equipment by isolating high-voltage input by electronic equipment when the constant current input port is detected.
Referring to fig. 1, fig. 1 shows a block diagram of a detection circuit of a constant current input port according to an embodiment of the present utility model. The detection circuit of the constant current input port includes: the voltage control module 101, the power output module 102 and the constant current output module 103 are all electrically connected.
The voltage control module 101 is connected with an external detection product, and is used for performing isolation processing on the high voltage input by the detection product through an isolation unit built in the voltage control module 101 so as to output low-voltage isolation output voltage according to the isolation unit. The power output module 102 is connected to the voltage control module 101, and is configured to be turned on according to the isolated output voltage, so as to output the isolated output voltage. The constant current output module 103 is connected with the power output module 102 and is used for stabilizing the output current according to the isolated output voltage to obtain and output a target stabilized current.
The detection product inputs detection voltage to a detection circuit of a constant current input port so as to input the detection voltage to the voltage control module 101, the voltage control module 101 performs isolation processing on the detection voltage input by the detection product through a built-in isolation unit so as to isolate a high voltage contained in the detection voltage and output a low-voltage isolated output voltage to the power output module 102, the power output module 102 is conducted or turned off according to the isolated output voltage, if the power output module 102 is conducted, the isolated output voltage is output to the constant current output module 103, and the constant current output module 103 performs stabilization processing on the output current according to the isolated output voltage so as to stabilize the output current to a fixed value, thereby obtaining and outputting a target stabilized current. The high-voltage input by the detection product is isolated through the built-in isolation unit of the voltage control module 101, the isolation output voltage is output to enable the power output module 102 to be conducted, the constant current output module 103 stabilizes the output current to the target stable current according to the isolation output voltage, and the high-voltage input by the electronic equipment can be isolated when the constant current input port is detected, so that the detection equipment is protected.
Referring to fig. 1 and 3, fig. 3 shows a schematic circuit diagram of a detection circuit of a constant current input port according to an embodiment of the present utility model. In some embodiments, the voltage control module 101 includes: the isolation unit comprises an optical coupler, and the controller is connected with the detection product and is used for receiving high-voltage. The optocoupler is connected with the controller and the power output module 102 through a preset GPIO interface, acquires high-voltage through the GPIO interface, and performs isolation processing on the high-voltage to obtain and output an isolated output voltage.
Referring to fig. 1 and 3, in some embodiments, the optocoupler includes a first pin, a second pin, a third pin, and a fourth pin, the optocoupler further includes a built-in optocoupler diode and an optocoupler triode, the first pin is connected to an anode of the optocoupler diode, the second pin is connected to a cathode of the optocoupler diode, the third pin is connected to an emitter of the optocoupler triode, and the fourth pin is connected to a collector of the optocoupler triode. The first pin is connected with one end of the optocoupler current-limiting resistor, the other end of the optocoupler current-limiting resistor is connected with a first working voltage, and the first working voltage is used for controlling the conduction of the optocoupler diode. The second pin is connected with the controller through a preset GPIO interface. The third pin is connected to the power output module 102. The fourth pin is connected with a second working voltage which is used for controlling the conduction of the phototriode.
It should be noted that, the controller is the controller MCU in fig. 3, the optocoupler is the optocoupler U1 in fig. 3, the optocoupler current limiting resistor is the resistor RX in fig. 3, the first operating voltage is the voltage VL in fig. 3, and the second operating voltage is the voltage VH in fig. 3. Wherein, rx is a current limiting resistor, and is mainly used for limiting the current on the light emitting diode, and rx=100deg.C.
The voltage control module 101 is mainly used for isolating the high voltage input by the external detection product and controlling the inside of the circuit to be at low voltage. Wherein the GPIO port is typically provided by a controller, which may include any one of: MCU, ARM, DSP and FPGA. The common level of GPIO input is 1.8V, 2.5V, 3.3V, 5V, and the circuit design is compatible.
The voltage control module 101 provides the high level or the low level of the GPIO port, so as to conduct the light emitting diode inside the optocoupler, namely the optocoupler diode. The light emitting diode has a conducting condition that the positive electrode is connected with a high level, and the negative electrode is connected with a low level, namely GPIO terminal voltage: when vin=0v, the optocoupler is turned on.
Referring to fig. 1 and 3, in some embodiments, the power output module 102 includes: the MOS transistor comprises a first current limiting resistor, a pull-down resistor, an isolating switch, a protection resistor and a first filter capacitor, wherein the isolating switch comprises an isolating MOS tube. One end of the first current limiting resistor is connected with the third pin. One end of the pull-down resistor is connected with the other end of the first current limiting resistor, and the other end of the pull-down resistor is grounded. The base electrode of the isolation MOS tube is connected between the first current limiting resistor and the pull-down resistor, the drain electrode of the isolation MOS tube is connected with a second working voltage, and the second working voltage is used for controlling the conduction of the isolation MOS tube. One end of the protection resistor is connected with the source electrode of the isolation MOS tube, and the other end of the protection resistor is grounded. One end of the first filter capacitor is connected between the protection resistor and the source electrode of the isolation MOS tube, and the other end of the first filter capacitor is grounded.
It should be noted that, the first current limiting resistor is the resistor R1 in fig. 3, the pull-down resistor is the resistor R2 in fig. 3, the isolation MOS transistor is the MOS transistor MOS1 in fig. 3, the protection resistor is the third resistor in fig. 3, and the first filter capacitor is the capacitor C1 in fig. 3. Wherein, R1 is a limiting resistor, which can be used to protect MOS transistor MOS1, r1=22Ω; r2 is a G-stage pull-down resistor of the MOS transistor MOS1, and is mainly used for controlling the working state of the MOS transistor MOS1 to be in an off state at the moment of power-up, where r2=10kΩ.
The power output module 102 is mainly used for generating the isolated power VH. When the voltage difference between the G level and the D level of the isolation MOS tube is larger than the conduction voltage of the isolation MOS tube, namely Vgs is larger than Vgs (th), the isolation MOS tube is in a saturated state, and the internal resistance is negligible.
Referring to fig. 1 and 3, in some embodiments, the constant current output module 103 includes: the output control unit comprises a step-down resistor, a first bias resistor, an output control unit, a second bias resistor and a filter capacitor. The step-down resistor is connected with the source electrode of the isolation MOS tube. The first bias resistor is connected between the dropping resistor and the source electrode of the isolation MOS tube. The output control unit is connected with the step-down resistor and the first bias resistor. One end of the second bias resistor is connected with the output control unit, and the other end of the second bias resistor is grounded. One end of the filter capacitor is connected with the output control unit, and the other end of the filter capacitor is grounded.
Referring to fig. 1 and 3, in some embodiments, an output control unit includes: the first control triode and the second control triode. The base electrode of the first control triode is connected with the step-down resistor, the emitter electrode of the first control triode is connected with the first bias resistor, and the collector electrode of the first control triode is connected with the second bias resistor. The base electrode of the second control triode is connected between the collector electrode of the first control triode and the second bias resistor, the emitter electrode of the second control triode is connected between the base electrode of the first control triode and the voltage dropping resistor, and the collector electrode of the second control triode is connected with the filter capacitor.
It should be noted that, the step-down resistor is a resistor Rj in fig. 3, the first bias resistor is a resistor R4 in fig. 3, the first control transistor is a transistor Q1 in fig. 3, the second control transistor is a transistor Q2 in fig. 3, the second bias resistor is a resistor R5 in fig. 3, and the filter capacitor is a capacitor C2 in fig. 3. The resistor R4 and the resistor R5 form a voltage dividing circuit to provide bias voltage for the second control triode, wherein r4=200Ω, r5=2.2kΩ; the capacitor C1 and the capacitor C2 are filter capacitors, c1=c2=0.1 uF; the resistor Rj is a limiting resistor and can control constant current output. In choosing the resistor Rj, the maximum power limit of the resistor Rj needs to be considered. The power pj=il2×rj generated by the current IL through the resistor Rj. It is desirable to select packages and resistances with a power tolerance less than Pj.
After the voltage VH is generated at the Vi port in fig. 3, since the first control transistor has a current flowing in the base, the second control transistor has a collector current flowing, and after the emitter current of the second control transistor flows through the resistor Rj, a voltage drop is generated across the resistor Rj. When the voltage drop across the resistor R1 reaches the saturation operating voltage Vbe of the first control transistor, the first control transistor is turned on, the base current of the first control transistor is reduced, and the collector current is also reduced. Therefore, after the first control triode is conducted, the base current of the second control triode is limited, so that the output current of the circuit is stabilized at a certain current value, namely the target stabilizing current. The current level of the target steady current is determined by the Vbe of Rj and Q1. Engineering it is generally considered that vbe=0.7v, the target steady current output by the circuit is: iout=vbe/rj=0.7/Rj. When Vgs > Vgs (th), the voltage at the input end of the Rj resistor is: vi=vh.
Referring to fig. 2, fig. 2 shows a block diagram of a detection circuit of a constant current input port according to an embodiment of the present utility model. In some embodiments, the detection circuit further comprises: a current detection module 201. The current detection module 201 is connected to the voltage control module 101 and the constant current output module 103, and is configured to detect a target stable current, obtain a detection current, and input the detection current to the voltage control module 101, so that the voltage control module 101 ends detection according to the detection current.
Referring to fig. 2 and 3, in some embodiments, the current detection module 201 includes: a current detection unit and an equivalent load. The current detection unit is connected to the constant current output module 103. One end of the equivalent load is connected with the current detection unit, and the other end of the equivalent load is grounded.
It should be noted that the current detection unit includes an external current detection circuit in fig. 3, and the equivalent load is the load RL in fig. 3.
The controller can judge that the circuit of the interface of the detection product is normal when the current data is the same as the current data actually output by acquiring the current data read by the current detection unit, otherwise, the detection product is abnormal.
In addition, an embodiment of the present utility model discloses a detection device for a constant current input port, the detection device for the constant current input port includes: the detection circuit of the constant current input port is the detection circuit of the constant current input port in any one of the embodiments.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.
Claims (9)
1. A detection circuit of a constant current input port, characterized by comprising:
the voltage control module is connected with an external detection product and is used for carrying out isolation treatment on high-voltage input by the detection product through an isolation unit built in the voltage control module so as to output low-voltage isolation output voltage according to the isolation unit;
the power supply output module is connected with the voltage control module and is used for conducting according to the isolation output voltage so as to output the isolation output voltage;
and the constant current output module is connected with the power supply output module and is used for stabilizing the output current according to the isolated output voltage to obtain and output a target stabilized current.
2. The constant current input port detection circuit of claim 1, wherein the voltage control module comprises:
the controller is connected with the detection product and is used for receiving the high-voltage;
the isolation unit comprises an optical coupler, the optical coupler is connected with the controller and the power output module through a preset GPIO interface, the high-voltage is obtained through the GPIO interface, the high-voltage is isolated, and the isolated output voltage is obtained and output.
3. The detection circuit of the constant current input port according to claim 2, wherein the optocoupler comprises a first pin, a second pin, a third pin and a fourth pin, the optocoupler further comprises a built-in optocoupler diode and an optocoupler triode, the first pin is connected with the anode of the optocoupler diode, the second pin is connected with the cathode of the optocoupler diode, the third pin is connected with the emitter of the optocoupler triode, and the fourth pin is connected with the collector of the optocoupler triode;
the first pin is connected with one end of an optocoupler current-limiting resistor, the other end of the optocoupler current-limiting resistor is connected with a first working voltage, and the first working voltage is used for controlling the conduction of the optocoupler diode;
the second pin is connected with the controller through a preset GPIO interface;
the third pin is connected with the power output module;
the fourth pin is connected with a second working voltage, and the second working voltage is used for controlling the conduction of the phototriode.
4. A constant current input port detection circuit according to claim 3, wherein the power output module comprises:
one end of the first current limiting resistor is connected with the third pin;
one end of the pull-down resistor is connected with the other end of the first current limiting resistor, and the other end of the pull-down resistor is grounded;
the isolating switch comprises an isolating MOS tube, a base electrode of the isolating MOS tube is connected between the first current limiting resistor and the pull-down resistor, a drain electrode of the isolating MOS tube is connected with the second working voltage, and the second working voltage is used for controlling the conducting of the isolating MOS tube;
one end of the protection resistor is connected with the source electrode of the isolation MOS tube, and the other end of the protection resistor is grounded;
and one end of the first filter capacitor is connected between the protection resistor and the source electrode of the isolation MOS tube, and the other end of the first filter capacitor is grounded.
5. The constant current input port detection circuit according to claim 4, wherein the constant current output module includes:
the step-down resistor is connected with the source electrode of the isolation MOS tube;
the first bias resistor is connected between the step-down resistor and the source electrode of the isolation MOS tube;
the output control unit is connected with the step-down resistor and the first bias resistor;
one end of the second bias resistor is connected with the output control unit, and the other end of the second bias resistor is grounded;
and one end of the filter capacitor is connected with the output control unit, and the other end of the filter capacitor is grounded.
6. The detection circuit of a constant current input port according to claim 5, wherein the output control unit includes:
the base electrode of the first control triode is connected with the step-down resistor, the emitting electrode of the first control triode is connected with the first bias resistor, and the collecting electrode of the first control triode is connected with the second bias resistor;
the base of the second control triode is connected between the collector of the first control triode and the second bias resistor, the emitter of the second control triode is connected between the base of the first control triode and the step-down resistor, and the collector of the second control triode is connected to the filter capacitor.
7. The detection circuit of a constant current input port according to claim 1, characterized in that the detection circuit further comprises:
the current detection module is connected with the voltage control module and the constant current output module and is used for detecting the target stable current to obtain detection current, and the detection current is input to the voltage control module so that the voltage control module can finish detection according to the detection current.
8. The constant current input port detection circuit of claim 7, wherein the current detection module comprises:
the current detection unit is connected with the constant current output module;
and one end of the equivalent load is connected with the current detection unit, and the other end of the equivalent load is grounded.
9. A detection device of a constant current input port, characterized by comprising:
a detection circuit for a constant current input port, the detection circuit being as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321901190.5U CN220626544U (en) | 2023-07-18 | 2023-07-18 | Detection circuit and device for constant current input port |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321901190.5U CN220626544U (en) | 2023-07-18 | 2023-07-18 | Detection circuit and device for constant current input port |
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| CN220626544U true CN220626544U (en) | 2024-03-19 |
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| CN202321901190.5U Active CN220626544U (en) | 2023-07-18 | 2023-07-18 | Detection circuit and device for constant current input port |
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