CN217034167U - Universal tooling plate - Google Patents
Universal tooling plate Download PDFInfo
- Publication number
- CN217034167U CN217034167U CN202220612020.4U CN202220612020U CN217034167U CN 217034167 U CN217034167 U CN 217034167U CN 202220612020 U CN202220612020 U CN 202220612020U CN 217034167 U CN217034167 U CN 217034167U
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- triode
- test
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Tests Of Electronic Circuits (AREA)
Abstract
The utility model discloses a universal tooling plate which comprises a plurality of test circuits. Each test circuit at least comprises an input interface and an output interface which are used for being respectively connected with the output end and the input end of the mainboard to be tested. In the plurality of test circuits, at least one test circuit comprises a voltage holding circuit so that the voltage accessed by the input interface is the same as the voltage accessed by the output interface; at least one of the test circuits includes a voltage conversion circuit to cause the voltage applied to the input interface to be different from the voltage applied to the output interface. For among the current technology, need design solitary frock board for each IO mouth of the mainboard that awaits measuring, adopt this technical scheme, set up a plurality of test circuit on a frock board, utilize a plurality of test circuit can test the same and different external IO of the voltage of the input and output of mainboard that awaits measuring simultaneously, need not to set up multiple frock board for a test mainboard again, simple and convenient operation of test, reduced the waste of resource.
Description
Technical Field
The utility model relates to the technical field of production testing, in particular to a universal tooling plate.
Background
Printed circuit boards, also known as printed circuit boards (pcbs), often referred to by the acronym pcb (printed circuit board), are important electronic components, support for electronic components, and providers for connecting electronic components and circuits.
With the wide use of PCBs, there are more and more external IOs, different PCBs have different external IO levels and different inputs and outputs, so it is very complicated to detect the external IO. The current test method needs to develop different tooling plates for different PCBs to detect IO of different levels at the same time, so that the operation is complex, and a lot of resources also need to be wasted.
Therefore, how to simply operate and reduce the waste of resources when detecting the external IO of the PCB is an urgent problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a universal tooling plate which is used for simply and conveniently operating and reducing the waste of resources when external IO of a PCB is detected.
In order to solve the above technical problem, the present invention provides a universal tooling plate, including:
a plurality of test circuits;
the test circuit at least comprises an input interface and an output interface which are used for being respectively connected with the output end and the input end of the mainboard to be tested;
at least one of the test circuits comprises a voltage holding circuit so that the voltage accessed by the input interface is the same as the voltage accessed by the output interface;
at least one of the test circuits includes a voltage conversion circuit to cause the voltage applied to the input interface and the voltage applied to the output interface to be different.
Preferably, the mainboard to be tested is a mainboard with the same IO voltage of the output end and the input end, and the voltage holding circuit comprises a resistor;
the input interface and the output interface are connected through the resistor.
Preferably, the mainboard that awaits measuring is the mainboard that the input is high level and output is the low level, voltage conversion circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor and a first triode;
the first end of the first resistor is connected with the input interface of the test circuit, the second end of the first resistor and the first end of the second resistor are connected with the base electrode of the first triode together, the second end of the second resistor and the emitting electrode of the first triode are grounded together, the first end of the third resistor is connected with the reference voltage, and the second end of the third resistor and the collecting electrode of the first triode are connected with the output interface of the test circuit together.
Preferably, the mainboard that awaits measuring is the input and is the mainboard of high level and output for the different high levels with the input, voltage conversion circuit includes: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the second triode;
the first end of the fourth resistor is connected with the input interface of the test circuit, the second end of the fourth resistor and the first end of the fifth resistor are connected with the emitting electrode of the second triode, the second end of the fifth resistor is grounded, the first end of the sixth resistor and the first end of the seventh resistor are connected with the reference voltage, the second end of the sixth resistor is connected with the base electrode of the second triode, and the second end of the seventh resistor and the collector electrode of the second triode are connected with the output interface of the test circuit.
Preferably, the mainboard that awaits measuring is the mainboard that the output is high impedance state and input is the high level, voltage conversion circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third triode;
the first end of the eighth resistor is connected with the input interface of the test circuit, the second end of the eighth resistor and the first end of the ninth resistor are connected with the base electrode of the third triode together, the emitting electrode of the third triode and the second end of the ninth resistor are grounded together, the first end of the tenth resistor and the first end of the eleventh resistor are connected with the collecting electrode of the third triode together, the second end of the tenth resistor is connected with the reference voltage, and the second end of the eleventh resistor is connected with the output interface of the test circuit.
Preferably, the mainboard that awaits measuring is the mainboard that the output is high impedance state and input is the low level, voltage conversion circuit includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a fourth triode;
the first end of the twelfth resistor is connected with the input interface of the test circuit, the second end of the twelfth resistor and the first end of the thirteenth resistor are connected with the base electrode of the fourth triode, the second end of the thirteenth resistor is connected with the power supply, the emitting electrode of the fourth triode is grounded, the first end of the fourteenth resistor and the first end of the fifteenth resistor are connected with the collecting electrode of the fourth triode, the second end of the fourteenth resistor is connected with the reference voltage, and the second end of the fifteenth resistor is connected with the output interface of the test circuit.
Preferably, the voltage holding circuit further includes: the anode of the diode is connected with the input interface of the test circuit, the cathode of the diode is connected with the first end of the resistor, and the second end of the resistor is connected with the corresponding output interface.
The universal tooling plate provided by the utility model comprises a plurality of test circuits. Each test circuit at least comprises an input interface and an output interface which are used for being respectively connected with the output end and the input end of the mainboard to be tested. In the plurality of test circuits, at least one test circuit comprises a voltage holding circuit so that the voltage accessed by the input interface is the same as the voltage accessed by the output interface; at least one of the test circuits includes a voltage conversion circuit to cause the voltage applied to the input interface to be different from the voltage applied to the output interface. For among the prior art, need design solitary frock board for each IO mouth of mainboard that awaits measuring, adopt this technical scheme, set up a plurality of test circuit on a frock board, utilize a plurality of test circuit can be simultaneously to the same and different external IO of the voltage of the input/output of mainboard that awaits measuring to test, need not to set up multiple frock board for a test mainboard again, simple and convenient operation of test, reduced the waste of resource.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a structural diagram of a universal tooling plate according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage holding circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a voltage converting circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of another voltage converting circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of another voltage converting circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of another voltage converting circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a universal tooling plate, which is used for simply and conveniently operating and reducing the waste of resources when detecting the external IO of the PCB.
In order that those skilled in the art will better understand the disclosure, reference will now be made in detail to the embodiments of the disclosure as illustrated in the accompanying drawings.
Fig. 1 is a structural diagram of a universal tooling plate according to an embodiment of the present invention, as shown in fig. 1, the universal tooling plate includes a plurality of test circuits;
each test circuit at least comprises an input interface 1 and an output interface 2 which are used for being respectively connected with the output end and the input end of the mainboard to be tested;
at least one test circuit is present and comprises a voltage holding circuit 3 so that the voltage accessed by the input interface 1 is the same as the voltage accessed by the output interface 2;
there is at least one test circuit comprising a voltage conversion circuit 4 to make the voltage applied to the input interface 1 different from the voltage applied to the output interface 2.
It should be noted that the main board to be tested has multiple pairs of connectors, each pair of connectors includes an input end and an output end, and when detecting external IO of the main board to be tested, multiple pairs of connectors need to be tested. In the plurality of pairs of connection ports, the voltages at the connection ports may be the same or different. Moreover, the number of inputs and outputs of the motherboard to be tested may be unequal, for example, one input corresponds to a plurality of outputs, and a plurality of inputs corresponds to one output. Also, the voltage at the input terminal and the voltage at the output terminal in each pair of connection ports may be the same or different. Therefore, in the prior art, it is necessary to design a separate test circuit for each pair of connectors to accommodate connectors of different voltages.
In the utility model, a plurality of test circuits are included, each test circuit comprises an input interface 1 and an output interface 2, and the input interface 1 and the output interface 2 are connected through a circuit to form a path. The circuit may be a voltage holding circuit 3 or a voltage conversion circuit 4, wherein the voltage holding circuit 3 keeps the access voltage and the output voltage constant, and the voltage conversion circuit 4 makes the access voltage and the output voltage different. It should be noted that the voltage holding circuit 3 and the voltage conversion circuit 4 may have various forms to satisfy various conditions of the input and output voltages of the motherboard to be tested. For example, when the input and output voltages of the connection port of the motherboard to be tested are the same, the IO voltage may be 1.8V, 3.3V, 5V, 12V, and so on, and it can be understood that, due to the difference of the access voltages, the voltage-withstanding device in the circuit may be adjusted, for example, the resistance value of the resistor may be changed.
When the mainboard to be tested is tested, according to the specific conditions of input and output voltages of the connectors of the mainboard to be tested, the connectors of the mainboard to be tested are connected with the corresponding test circuits on the universal tooling plate, the output end of the mainboard to be tested is connected with the input interface 1 of the corresponding test circuit, the input end of the mainboard to be tested is connected with the output interface 2 of the corresponding test circuit, therefore, a complete loop is formed, and the external IO test of the mainboard to be tested is realized.
The universal tooling plate provided by the embodiment of the utility model comprises a plurality of test circuits. Each test circuit at least comprises an input interface and an output interface which are used for being respectively connected with the output end and the input end of the mainboard to be tested. In the plurality of test circuits, at least one test circuit comprises a voltage holding circuit so that the voltage accessed by the input interface is the same as the voltage accessed by the output interface; at least one of the test circuits includes a voltage conversion circuit to cause the voltage applied to the input interface to be different from the voltage applied to the output interface. For among the prior art, need design solitary frock board for each IO mouth of mainboard that awaits measuring, adopt this technical scheme, set up a plurality of test circuit on a frock board, utilize a plurality of test circuit can be simultaneously to the same and different external IO of the voltage of the input/output of mainboard that awaits measuring to test, need not to set up multiple frock board for a test mainboard again, simple and convenient operation of test, reduced the waste of resource.
The above embodiment describes the structure of the universal tooling plate, and for convenience of understanding, the following detailed description is performed on a specific test scenario of external IO of the main board to be tested by combining the universal tooling plate.
Scene one: in a specific implementation, for a motherboard to be tested having the same IO voltage at the output end and the input end, an input interface 1 and an output interface 2 of a test circuit are connected through a voltage holding circuit 3, and fig. 2 is a circuit diagram of the voltage holding circuit 3 according to an embodiment of the present invention, and as shown in fig. 2, the circuit includes a resistor R; the input interface 1 and the output interface 2 are connected by a resistor R.
In the circuit shown in fig. 2, the resistor R between the input interface 1 and the output interface 2 may be one resistor as a whole, or a resistor R may be provided for each path. Specifically, if the same resistor R is used for the multiple connectors, in order to avoid mutual interference between signals, the voltage holding circuit 3 should further include a diode D disposed between the input interface 1 and the resistor R, wherein an anode of the diode D is connected to the input interface 1, and a cathode of the diode D is connected to the resistor R. It will be appreciated that for a voltage holding circuit 3 with multiple inputs, a diode D should be provided on each path.
When the main board to be tested has a plurality of pairs of IO voltages of the output end and the input end, the universal tooling board should also have a plurality of voltage holding circuits 3, and the corresponding voltage holding circuit 3 is selected according to the specific input and output voltages of the main board to be tested. It is understood that there may be a plurality of identical voltage holding circuits 3 that are adapted to the same voltage among the plurality of voltage holding circuits 3, and there may also be voltage holding circuits 3 that are adapted to a plurality of voltages.
According to the universal tooling board provided by the embodiment of the utility model, the resistor is used as the voltage holding circuit, so that the voltage connected to the test circuit and the output voltage are kept unchanged, and the test of the mainboard to be tested with the same IO voltage at the output end and the input end is realized.
Scene two: for the mainboard that the input is the high level and the output is the low level that awaits measuring the mainboard, because output and input end voltage are different, consequently need voltage conversion circuit 4 on the general frock board to test. Fig. 3 is a circuit diagram of a voltage converting circuit 4 according to an embodiment of the present invention, and as shown in fig. 3, the voltage converting circuit 4 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first triode Q1.
The first end of the first resistor R1 is connected with the input interface 1 of the test circuit, the second end of the first resistor R1 and the first end of the second resistor R2 are connected with the base of the first triode Q1, the second end of the second resistor R2 and the emitter of the first triode Q1 are grounded, the first end of the third resistor R3 is connected with the reference voltage, and the second end of the third resistor R3 and the collector of the first triode Q1 are connected with the output interface 2 of the test circuit.
As can be seen from fig. 3, when the voltage of the input terminal of the motherboard to be tested, which is connected to the voltage conversion circuit 4, is at a high level, the first transistor Q1 is in a conducting state, so that the reference voltage connected to the third resistor R3 is grounded, and the voltage at the output interface 2 of the test circuit is at a low level, thereby implementing conversion from the input high level to the output low level.
The general frock board that this embodiment provided, through voltage conversion circuit, convert the input voltage of high level into the output voltage of low level, realize being the test of the external IO of the mainboard that the input is high level and the output is the low level for the mainboard to be measured.
Scene three: for a motherboard to be tested whose input end is at a high level and output end is at a high level different from the input end, voltage conversion is also required, fig. 4 is a circuit diagram of another voltage conversion circuit 4 provided in an embodiment of the present invention, and as shown in fig. 4, the circuit includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second triode Q2.
The first end of the fourth resistor R4 is connected with the input interface 1 of the testing circuit, the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are connected with the emitter of the second triode Q2, the second end of the fifth resistor R5 is grounded, the first end of the sixth resistor R6 and the first end of the seventh resistor R7 are connected with the reference voltage, the second end of the sixth resistor R6 is connected with the base of the second triode Q2, and the second end of the seventh resistor R7 and the collector of the second triode Q2 are connected with the output interface 2 of the testing circuit.
As shown in fig. 4, in this embodiment, the voltage required for the second transistor Q2 to turn on is provided by the reference voltage on the general purpose tooling board, and the voltage of the output interface 2 of the test circuit is determined by the reference voltage.
The general frock board that this embodiment provided, through voltage conversion circuit and reference voltage, convert the input voltage of high level into the output voltage of another kind of required high level, realize the mainboard that awaits measuring for the input be the test of the external IO of high level and output for the mainboard with the different high levels of input.
Scene four: in the specific implementation, the output of the mainboard to be tested may be in a high impedance state, the high impedance state is a common term in a digital circuit, and refers to an output state of the circuit, which is neither a high level nor a low level, if the high impedance state is input into the next stage circuit, there is no influence on the next stage circuit, and as the case may be, if the high impedance state is measured by a multimeter, it may be a high level or a low level, depending on what is connected to it later. For a motherboard to be tested that has a high impedance output terminal and a high level input terminal, fig. 5 is a circuit diagram of another voltage conversion circuit 4 according to an embodiment of the present invention, as shown in fig. 5, the circuit includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a third triode Q3;
the first end of the eighth resistor R8 is connected with the input interface 1 of the test circuit where the test circuit is located, the second end of the eighth resistor R8 and the first end of the ninth resistor R9 are connected with the base of the third triode Q3 in common, the emitter of the third triode Q3 and the second end of the ninth resistor R9 are connected with the ground in common, the first end of the tenth resistor R10 and the first end of the eleventh resistor R11 are connected with the collector of the third triode Q3 in common, the second end of the tenth resistor R10 is connected with the reference voltage, and the second end of the eleventh resistor R11 is connected with the output interface 2 of the test circuit where the test circuit is located.
As shown in fig. 5, since the output terminal of the main board to be tested connected to the test circuit is in a high impedance state and is connected to ground, and the level is low, the third transistor Q3 is not turned on, and the voltage of the output interface 2 is the same as the reference voltage, so that the output voltage is high.
The universal tooling board that this embodiment provided realizes the test of the mainboard that awaits measuring that the output is high impedance state and input be the high level through voltage conversion circuit.
Scene five: for a motherboard to be tested whose output end is in a high impedance state and input end is in a low level, fig. 6 is a circuit diagram of another voltage conversion circuit 4 provided in an embodiment of the present invention, as shown in fig. 6, the voltage conversion circuit 4 includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a fourth triode Q4;
the first end of a twelfth resistor R12 is connected with the input interface 1 of the testing circuit, the second end of the twelfth resistor R12 and the first end of a thirteenth resistor R13 are connected with the base electrode of a fourth triode Q4 in common, the second end of the thirteenth resistor R13 is connected with a power supply, the emitter electrode of the fourth triode Q4 is grounded, the first end of a fourteenth resistor R14 and the first end of a fifteenth resistor R15 are connected with the collector electrode of the fourth triode Q4 in common, the second end of the fourteenth resistor R14 is connected with a reference voltage, and the second end of the fifteenth resistor R15 is connected with the output interface 2 of the testing circuit.
In this embodiment, the power supply is connected to the input interface, the level is changed to a high level, the fourth triode is turned on, and the reference voltage is grounded, so that the voltage of the output interface is a low level, and the test of the mainboard with the output end in a high impedance state and the input end in a low level is realized.
The general tooling plate provided by the utility model is described in detail above. The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It should also be noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. A universal tooling plate, comprising:
a plurality of test circuits;
the test circuit at least comprises an input interface and an output interface which are used for being respectively connected with the output end and the input end of the mainboard to be tested;
at least one of the test circuits comprises a voltage holding circuit so that the voltage accessed by the input interface is the same as the voltage accessed by the output interface;
there is at least one said test circuit including a voltage conversion circuit to cause the voltage applied to said input interface and the voltage applied to said output interface to be different.
2. The universal tooling board according to claim 1, wherein the main board to be tested is a main board having the same IO voltage at the output end and the input end, and the voltage holding circuit comprises a resistor;
the input interface and the output interface are connected through the resistor.
3. The universal tooling plate according to claim 1, wherein the main board to be tested is a main board with an input end at a high level and an output end at a low level, the voltage conversion circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a first triode;
the first end of the first resistor is connected with the input interface of the test circuit, the second end of the first resistor and the first end of the second resistor are connected with the base electrode of the first triode together, the second end of the second resistor and the emitting electrode of the first triode are grounded together, the first end of the third resistor is connected with the reference voltage, and the second end of the third resistor and the collecting electrode of the first triode are connected with the output interface of the test circuit together.
4. The universal tooling board of claim 1, wherein the main board to be tested is a main board with an input terminal at a high level and an output terminal at a different high level from the input terminal, and the voltage conversion circuit comprises: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the second triode;
the first end of the fourth resistor is connected with the input interface of the test circuit, the second end of the fourth resistor and the first end of the fifth resistor are connected with the emitting electrode of the second triode, the second end of the fifth resistor is grounded, the first end of the sixth resistor and the first end of the seventh resistor are connected with the reference voltage, the second end of the sixth resistor is connected with the base electrode of the second triode, and the second end of the seventh resistor and the collector electrode of the second triode are connected with the output interface of the test circuit.
5. The universal tooling plate according to claim 1, wherein the main board to be tested is a main board having an output terminal in a high impedance state and an input terminal in a high level, the voltage conversion circuit comprises: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third triode;
the first end of the eighth resistor is connected with the input interface of the test circuit, the second end of the eighth resistor and the first end of the ninth resistor are connected with the base electrode of the third triode together, the emitting electrode of the third triode and the second end of the ninth resistor are grounded together, the first end of the tenth resistor and the first end of the eleventh resistor are connected with the collecting electrode of the third triode together, the second end of the tenth resistor is connected with the reference voltage, and the second end of the eleventh resistor is connected with the output interface of the test circuit.
6. The universal tooling board of claim 1, wherein the main board to be tested is a main board with an output terminal in a high impedance state and an input terminal in a low electrical level, and the voltage conversion circuit comprises: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a fourth triode;
the first end of the twelfth resistor is connected with the input interface of the test circuit, the second end of the twelfth resistor and the first end of the thirteenth resistor are connected with the base electrode of the fourth triode, the second end of the thirteenth resistor is connected with the power supply, the emitting electrode of the fourth triode is grounded, the first end of the fourteenth resistor and the first end of the fifteenth resistor are connected with the collecting electrode of the fourth triode, the second end of the fourteenth resistor is connected with the reference voltage, and the second end of the fifteenth resistor is connected with the output interface of the test circuit.
7. The universal tooling plate of claim 2, wherein the voltage holding circuit further comprises: the anode of the diode is connected with the input interface of the test circuit, the cathode of the diode is connected with the first end of the resistor, and the second end of the resistor is connected with the corresponding output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220612020.4U CN217034167U (en) | 2022-03-18 | 2022-03-18 | Universal tooling plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220612020.4U CN217034167U (en) | 2022-03-18 | 2022-03-18 | Universal tooling plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217034167U true CN217034167U (en) | 2022-07-22 |
Family
ID=82455970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220612020.4U Active CN217034167U (en) | 2022-03-18 | 2022-03-18 | Universal tooling plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217034167U (en) |
-
2022
- 2022-03-18 CN CN202220612020.4U patent/CN217034167U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210804388U (en) | Hot plug detection circuit and electronic equipment | |
| CN104750585A (en) | Terminal detecting method and terminal detecting device | |
| CN106291321B (en) | L abWindows/CVI-based plasma power supply circuit automatic test platform and method | |
| CN217034167U (en) | Universal tooling plate | |
| CN213210263U (en) | Oscilloscope probe switching device | |
| CN110875607A (en) | Charging system | |
| CN115792477A (en) | Automatic test system based on high-precision instrument | |
| CN102024177B (en) | Counting device | |
| Maini | Electronic projects for beginners | |
| CN215772913U (en) | High-precision output voltage device controlled by PWM | |
| CN203537553U (en) | An Interface circuit realizing serial port and infrared multiplex functions | |
| CN206302404U (en) | A kind of keyboard scanning circuit and digital control system | |
| CN112485701A (en) | Universal switching adapter plate for testing DC/DC power supply module and testing method thereof | |
| CN113691275B (en) | Digital signal transmission circuit and digital signal transmission device | |
| CN212965129U (en) | Differential sampling circuit for multi-path alternating current distribution voltage | |
| CN209979791U (en) | Reset circuit testing device and system | |
| CN215378452U (en) | Adaptive power supply circuit of debugger and debugger | |
| CN216929999U (en) | Level conversion circuit in unidirectional transmission circuit and electronic equipment | |
| CN216013585U (en) | Signal detection circuit with multi-state output | |
| CN219161495U (en) | Multi-point temperature acquisition circuit | |
| CN212723119U (en) | Circuit for solving temperature effect caused by direct current test in direct current test | |
| CN216792297U (en) | Direct current constant current type ADC front-end circuit for resistance value detection | |
| CN113495208B (en) | Device, system and method for testing power supply circuit of packaged circuit board | |
| CN220419955U (en) | Serial port circuit of video processor and video processor system | |
| CN219041460U (en) | Power supply circuit, power supply circuit board and power supply equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |