CN215641634U - Low-voltage and overvoltage protection circuit and circuit board testing device - Google Patents
Low-voltage and overvoltage protection circuit and circuit board testing device Download PDFInfo
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- CN215641634U CN215641634U CN202121695993.0U CN202121695993U CN215641634U CN 215641634 U CN215641634 U CN 215641634U CN 202121695993 U CN202121695993 U CN 202121695993U CN 215641634 U CN215641634 U CN 215641634U
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Abstract
The utility model provides a low-voltage and overvoltage protection circuit, which comprises: the device comprises a main control module, a voltage conversion module, a relay control module and an ADC (analog to digital converter) conversion module; the main control module is respectively connected with the voltage conversion module, the relay control module and the ADC conversion module; the voltage conversion module is used for converting the input voltage to obtain various voltages and respectively providing voltages for the main control module, the relay control module and the ADC conversion module; the ADC conversion module is connected with the client board to be tested; the main control module is used for sending a closing signal to the relay control module when detecting that the voltage of the client board to be tested is in a low-voltage or overvoltage state; the relay control module is connected with the client board to be tested and used for disconnecting power supply to the client board to be tested when receiving a closing signal sent by the main control module. The circuit can effectively protect the client board to be tested when low voltage or overvoltage occurs. In addition, a circuit board testing device is also provided.
Description
Technical Field
The utility model relates to the technical field of testing, in particular to a low-voltage and overvoltage protection circuit and a circuit board testing device.
Background
The method for testing the circuit board of the chip comprises the steps that a chip is tested by a test board testing device, a test board testing device is arranged on the test board testing device, and the test board testing device is used for testing the circuit board of the chip.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that a to-be-tested board of a customer is not damaged while a circuit is protected, a low-voltage and overvoltage protection circuit and a circuit board testing device are provided.
A low voltage and overvoltage protection circuit, said low voltage and overvoltage protection circuit comprising: the device comprises a main control module, a voltage conversion module, a relay control module and an ADC (analog to digital converter) conversion module;
the main control module is respectively connected with the voltage conversion module, the relay control module and the ADC conversion module;
the voltage conversion module is used for converting input voltage to obtain various voltages and respectively providing voltages for the main control module, the relay control module and the ADC conversion module;
the ADC conversion module is connected with a client board to be detected and used for converting the detected analog voltage of the client board to be detected into a digital signal and transmitting the digital signal to the main control module;
the main control module is used for sending a closing signal to the relay control module when detecting that the voltage of the client board to be tested is in a low-voltage or overvoltage state;
and the relay control module is connected with the client board to be tested and used for disconnecting power supply to the client board to be tested when receiving the closing signal sent by the main control module.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the data transmission module is connected with the main control module and used for converting the TTL mode into the RS232 mode and sending the test result to an upper computer for displaying.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: the debugging and burning module is respectively connected with the main control module and the upper computer and is used for burning the test script programmed by the upper computer into the single chip microcomputer in the main control module; the main control module is further configured to send a test program instruction based on the test script, so that the ADC conversion module detects the voltage of the client board to be tested.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the relay control module is connected with the client board to be tested through the multiple power interfaces.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the reset module is connected with the main control module and used for restarting the main control module.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the storage equipment is connected with the main control module and used for storing the test data and the test result.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: LED status display lamp that respectively with host system with the voltage conversion module is connected, LED status display lamp includes: power indicator, unusual pilot lamp and test result pilot lamp.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the manual/automatic power on/off switching key module is connected with the main control module and is used for switching between a manual mode and an automatic mode.
In one embodiment, the voltage conversion module is connected to an adapter for supplying power to the low voltage and overvoltage protection circuit.
A circuit board testing device, said device comprising any of the low voltage and overvoltage protection circuits of the previous embodiments.
The low-voltage and overvoltage protection circuit and the circuit board testing device are connected with a client board to be tested through the ADC conversion module to carry out voltage detection, digital signals of the voltage of the client board to be tested are transmitted to the main control module, and when the main control module detects that the client board to be tested is in a low-voltage or overvoltage state, the main control module controls the relay to disconnect the connection with the client board to be tested, so that the problem that the client board to be tested is not damaged when low voltage or overvoltage occurs is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram of the low voltage and overvoltage protection circuits in one embodiment;
FIG. 2A is a schematic diagram of an embodiment of a circuit for converting to 3.3V in a voltage conversion module;
FIG. 2B is a schematic diagram of an embodiment of a circuit for converting to 5V in the voltage conversion module;
FIG. 3 is a schematic diagram of one relay circuit in the relay control module in one embodiment;
fig. 4 is a block diagram of the low voltage and overvoltage protection circuit in another embodiment.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, in one embodiment, a low voltage and overvoltage protection circuit 100 is provided, comprising: the main control module 102, the voltage conversion module 104, the relay control module 106 and the ADC conversion module 108;
the main control module 102 is respectively connected to the voltage conversion module 104, the relay control module 106 and the ADC conversion module 108; the voltage conversion module 104 is configured to convert an input voltage into a plurality of voltages, and respectively provide the voltages for the main control module 102, the relay control module 106, and the ADC conversion module 108. The ADC conversion module 108 is connected to the client board 200 to be tested, and is configured to convert the detected analog voltage of the client board to be tested into a digital signal and transmit the digital signal to the main control module 102; the main control module 102 is configured to send a closing signal to the relay control module when detecting that the voltage of the client board 200 to be tested is in a low-voltage or overvoltage state; the relay control module 106 is connected to the client board 200 to be tested, and is configured to disconnect power supply to the client board 200 to be tested when receiving a shutdown signal sent by the main control module 102.
The main control module 102 may be implemented by an STM32H743 single chip microcomputer. The voltage conversion module 104 uses a DC-DC voltage conversion circuit to realize voltage conversion, and can convert various voltages, for example, voltages of 5V and 3.3V. The voltages required by different modules are not very same, so that a plurality of groups of voltages need to be converted by the voltage conversion module and are used by each module in the circuit. In one embodiment, the voltage conversion module 104 converts 9 sets of 5V voltages, one set of which is provided to the ADC conversion module 108, and another 8 sets of 5V voltage outputs are provided for use by the 8-way relay circuit included in the relay control module 106. In addition, the voltage of 3.3V is output to the main control module 102 for use. Fig. 2 is a schematic diagram of a circuit for converting to 3.3V and 5V respectively in the voltage conversion module in one embodiment, fig. 2A is a schematic diagram of a circuit for converting to 3.3V, and fig. 2B is a schematic diagram of a circuit for converting to 5V.
The relay control module 106 is connected to the client board 200 to be tested, and is configured to control connection or disconnection with the client board 200 to be tested. When the power supply is turned on, the power is supplied to the client board to be tested through the relay control module 106, and when the power supply is turned off, the connection with the client board to be tested 200 is disconnected, and the power supply is stopped. In one embodiment, the relay control module 106 includes 8 relay circuits, each of which is connected to a corresponding power interface on the client board to be tested, and the client board to be tested is correspondingly provided with 8 sets of power interfaces. Fig. 3 is a schematic diagram of a relay circuit in one embodiment.
The ADC conversion module 108 is configured to be connected to the client board 200 to be tested, detect a voltage on the client board to be tested, convert an analog voltage signal into a digital signal, and transmit the digital signal to the main control module 102, where the main control module 102 determines whether the voltage is within a preset range according to the digital signal, and when the voltage is not within the preset range, the voltage is in a low-voltage or overvoltage state, and at this time, in order to protect the client board to be tested from being damaged, the connection with the client board to be tested is disconnected through the relay control module. It should be noted that the improvement point of the present application is the arrangement of the respective modules in the circuit, and does not relate to the improvement of the software method.
The low-voltage and overvoltage protection circuit is connected with a client board to be tested through the ADC conversion module to carry out voltage detection, transmits a digital signal of the voltage of the client board to be tested to the main control module, and when the main control module detects that the client board to be tested is in a low-voltage or overvoltage state, the main control module controls the relay control module to be disconnected from the client board to be tested, so that the problem that the client board to be tested is not damaged when the low-voltage or overvoltage occurs is solved.
In one embodiment, as shown in fig. 4, the low voltage and overvoltage protection circuit further includes: and the data transmission module 110 is connected with the main control module and is used for converting the TTL mode into the RS232 mode and sending the test result to an upper computer for displaying. The debugging and burning module 112 is respectively connected with the main control module and the upper computer and is used for burning the test script programmed by the upper computer into the single chip microcomputer in the main control module; the main control module 102 is further configured to send a test program instruction based on the test script, so that the ADC conversion module 108 detects the voltage of the client board to be tested.
The data transmission module can also be called a level conversion module and is used for transmitting a test result to the upper computer after level conversion. The method and the device are used for converting the TTL mode into the RS232 mode. Wherein, TTL level: full duplex (logic 1: 2.4V-5V logic 0: 0V-0.5V). RS-232 level: full duplex (logic 1: -15V-5V logic 0: + 3V-15V).
The debugging and burning module 112 is used for burning a test script programmed by an upper computer (PC end) into the single chip microcomputer. After normal power supply, a test program is compiled through an upper computer, then the program is burnt into the main control module through a JTAG/SWD interface, then the main control module is restarted, and then the main control module automatically runs according to the test program to perform a voltage detection function and start a relay switch to supply power to a board to be tested of a client.
In one embodiment, the low voltage and overvoltage protection circuit further comprises: and the relay control module is connected with the client board to be tested through the multiple power interfaces.
The relay control module correspondingly includes a plurality of relay circuits, each relay circuit corresponds to one group of power interfaces, and in one embodiment, there are 8 groups of power interfaces, and correspondingly there are 8 relay circuits.
The circuit can be connected to a customer board to be tested in a wire bonding mode through any power interface TP1-8, so that the number of implants on the customer board to be tested is reduced, the original design of the customer board is not damaged, and the test requirements of a large number of platforms can be met by setting 8 groups of power interfaces. Specifically, the voltage detection of the first group is performed within a preset time (e.g., 1 second) after the circuit normally operates, whether the voltage is within a set range is determined, and when the voltage detection of the first group is finished, the voltage detection of the second group is started, and so on, and the third group to the eighth group.
Referring to fig. 4, in one embodiment, the low voltage and overvoltage protection circuit further includes: a reset module 114 connected to the main control module, configured to restart the main control module; the storage device 116 is connected with the main control module and used for storing test data and test results; LED status display lamp 118 connected with the main control module and the voltage conversion module respectively, the LED status display lamp includes: the device comprises a power supply indicator light, an abnormal indicator light and a test result indicator light; and a manual/automatic power on/off switching key module 120 connected to the main control module, the manual/automatic power on/off switching key module being configured to switch between a manual mode and an automatic mode.
The reset module 114 is used to restart the main control module, and restart the test program. The memory device 116 may be implemented by an SPI memory chip for storing test results and test data. The LED status display 118 is used for status indication, and includes a power indicator, which is turned on when the power is turned on, and turned on when the abnormality indicator detects abnormality, and turned on when the test result indicator detects low voltage or overvoltage. The manual/automatic power on/off switching key module 120 is used to perform manual mode or automatic mode power switching.
In one embodiment, the voltage conversion module is connected to an adapter for powering the low voltage and overvoltage protection circuits.
The low-voltage and overvoltage protection circuit is connected with the upper adapter through the main power supply to supply power, and the adapter and the voltage conversion module supply power. In one embodiment, the 12V, 3A adapter is used for supplying power, the total power input can be controlled by the switch element, and after the power is supplied, the voltage conversion module performs voltage conversion to convert the power into 5V and 3.3V.
A circuit board testing device comprises the low-voltage and overvoltage protection circuit.
The low voltage and overvoltage protection circuit and the circuit board testing device belong to a general inventive concept, and it can be understood that the embodiments of the two can be mutually applicable.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A low voltage and overvoltage protection circuit, characterized in that it comprises: the device comprises a main control module, a voltage conversion module, a relay control module and an ADC (analog to digital converter) conversion module;
the main control module is respectively connected with the voltage conversion module, the relay control module and the ADC conversion module;
the voltage conversion module is used for converting input voltage to obtain various voltages and respectively providing voltages for the main control module, the relay control module and the ADC conversion module;
the ADC conversion module is connected with a client board to be detected and used for converting the detected analog voltage of the client board to be detected into a digital signal and transmitting the digital signal to the main control module;
the main control module is used for sending a closing signal to the relay control module when detecting that the voltage of the client board to be tested is in a low-voltage or overvoltage state;
and the relay control module is connected with the client board to be tested and used for disconnecting power supply to the client board to be tested when receiving the closing signal sent by the main control module.
2. The low voltage and overvoltage protection circuit of claim 1, further comprising:
and the data transmission module is connected with the main control module and used for converting the TTL mode into the RS232 mode and sending the test result to an upper computer for displaying.
3. The low voltage and overvoltage protection circuit of claim 1, further comprising:
the debugging and burning module is respectively connected with the main control module and the upper computer and is used for burning the test script programmed by the upper computer into the single chip microcomputer in the main control module;
the main control module is further configured to send a test program instruction based on the test script, so that the ADC conversion module detects the voltage of the client board to be tested.
4. The low voltage and overvoltage protection circuit of claim 1, further comprising: and the relay control module is connected with the client board to be tested through the multiple power interfaces.
5. The low voltage and overvoltage protection circuit of claim 1, further comprising: and the reset module is connected with the main control module and used for restarting the main control module.
6. The low voltage and overvoltage protection circuit of claim 1, further comprising: and the storage equipment is connected with the main control module and used for storing the test data and the test result.
7. The low voltage and overvoltage protection circuit of claim 1, further comprising: LED status display lamp that respectively with host system with the voltage conversion module is connected, LED status display lamp includes: power indicator, unusual pilot lamp and test result pilot lamp.
8. The low voltage and overvoltage protection circuit of claim 1, further comprising: and the manual/automatic power on/off switching key module is connected with the main control module and is used for switching between a manual mode and an automatic mode.
9. The undervoltage and overvoltage protection circuit according to claim 1, wherein the voltage conversion module is connected to an adapter for powering the undervoltage and overvoltage protection circuit.
10. A circuit board testing device comprising a low voltage and overvoltage protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121695993.0U CN215641634U (en) | 2021-07-23 | 2021-07-23 | Low-voltage and overvoltage protection circuit and circuit board testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121695993.0U CN215641634U (en) | 2021-07-23 | 2021-07-23 | Low-voltage and overvoltage protection circuit and circuit board testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215641634U true CN215641634U (en) | 2022-01-25 |
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|---|---|---|---|
| CN202121695993.0U Active CN215641634U (en) | 2021-07-23 | 2021-07-23 | Low-voltage and overvoltage protection circuit and circuit board testing device |
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| CN (1) | CN215641634U (en) |
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- 2021-07-23 CN CN202121695993.0U patent/CN215641634U/en active Active
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