CN218630131U - Detection circuit for detecting tool of industrial personal computer power module - Google Patents
Detection circuit for detecting tool of industrial personal computer power module Download PDFInfo
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Abstract
The application discloses a detection circuitry for detecting industrial computer power module's detection frock, it is including load module, low pressure detection module, excessive pressure detection module and overcurrent detection module. The load module is connected to the power module to be detected and outputs a first voltage signal to be detected and a second voltage signal to be detected. The low voltage detection module can output a low voltage detection signal based on a first preset voltage signal. The overvoltage detection module outputs an overvoltage detection signal based on the first preset voltage signal. The over-current detection module can output an over-current detection signal based on the second to-be-detected voltage signal. When auxiliary power supply breaks down, the current or voltage can be locked, if the voltage of the auxiliary power supply breaks down, the voltage fault can be locked to be an overvoltage fault or a low-voltage fault, and the power module to be tested can be tested without returning to a production unit to perform on-line testing.
Description
Technical Field
The application relates to the field of detection circuits, in particular to a detection circuit for detecting a detection tool of an industrial personal computer power module.
Background
The equipment is an indispensable component in the production link of an enterprise, and various advanced automatic equipment greatly improve the production efficiency and the product quality of the enterprise. Therefore, a large number of new and old imported devices which are advanced at the same time play a role in each process flow of production and processing enterprises for years. Just as people get ill and need to see a doctor, equipment can also have various sudden failures, sometimes, the whole production line has to be stopped because of a small equipment failure, and even some old equipment is stopped for a long time, so that suitable spare parts are difficult to find. Professional automatic equipment maintenance teams and enterprises serve as equipment doctors and hospitals, so that pain points and short plates which are difficult to respond in time and high in maintenance cost are made up, and the downtime and maintenance cost of users are greatly reduced.
The industrial computer power module can export auxiliary power sources such as DC3.3V, DC5.1V, DC12V at normal during operation, when the industrial computer power module of production facility needs the off-line maintenance because of the trouble, can face usually and need test after the maintenance is accomplished whether prosthetic problem completely. Traditional maintenance mode can only return production unit and carry out the test of going online because of lacking test means and equipment, but in case power module fails to restore completely in the similar, has trouble hidden danger, lightly makes and produces line equipment and reports mistake and unable normal operating, then can damage other equipment because more serious trouble seriously, and comes and goes to go online and detect and need spend too much time and cost, is unfavorable for high efficiency's completion maintenance.
SUMMERY OF THE UTILITY MODEL
In order to improve power module's maintenance efficiency, this application provides a detection circuitry for detecting industrial computer power module's detection frock.
The application provides a detection circuitry for detecting industrial computer power module's detection frock adopts following technical scheme:
this a detection circuitry for detecting industrial computer power module's detection frock includes:
the load module is connected with the power supply module to be detected, and is used for acquiring a signal to be detected from the power supply module to be detected, outputting a first voltage signal to be detected through the voltage division output node based on the signal to be detected, and outputting a second voltage signal to be detected through the trunk output node;
the low-voltage detection module is used for acquiring a first voltage signal to be detected from the load module, comparing a first preset voltage signal with the acquired first voltage signal to be detected and outputting a low-voltage detection signal based on the comparison result;
the overvoltage detection module is used for acquiring a first voltage signal to be detected from the load module, comparing a second preset voltage signal with the acquired first voltage signal to be detected, and outputting an overvoltage detection signal based on a comparison result;
and the overcurrent detection module is used for acquiring a second voltage signal to be detected from the load module and outputting an overcurrent detection signal based on the second voltage signal to be detected.
By adopting the technical scheme, the power module to be tested is externally connected with the working power supply, the auxiliary power supply is output, and the detection circuit in the detection tool is used for testing whether the auxiliary power supply output by the power module to be tested normally works. The power module to be detected is connected with the load module, can detect the loaded capacity of the auxiliary power supply, and outputs a voltage signal to be detected. The detection module can receive a detection voltage signal to test whether the voltage and the current of the auxiliary power supply can be normally output. If the auxiliary power supply fails, whether current failure or voltage failure occurs can be locked, and if the voltage of the auxiliary power supply fails, whether the voltage failure is overvoltage failure or low-voltage failure can be locked. So set up, the power module that awaits measuring need not to return the production unit and carry out the on-line test alright with the completion test, has improved power module's maintenance efficiency.
Optionally, the low voltage detection module includes:
the first voltage comparison unit comprises a first voltage comparator OA1, wherein a non-inverting input end of the first voltage comparator OA1 is used for acquiring a first voltage signal to be detected from a load module, an inverting input end of the first voltage comparator OA1 is used for acquiring a first preset level signal, and an output end of the first voltage comparator OA1 is used for outputting a low-voltage detection signal;
the first fault signal unit comprises a first light emitting diode (LED 1), the anode of the first LED1 is connected with a power supply, the cathode of the first LED1 is used for receiving a low-voltage detection signal, and the first LED1 outputs a first light fault signal based on the low-voltage detection signal.
By adopting the above technical scheme, the first voltage comparator OA1 is used to compare the first preset level signal with the first voltage signal to be detected acquired from the load module. When the first to-be-detected voltage signal is greater than the first preset level signal, the first voltage comparator OA1 outputs a high-level low-voltage detection signal, and at this time, the first light emitting diode LED1 is not turned on after receiving the high-level low-voltage detection signal, and cannot output the first optical fault signal. When the first to-be-detected voltage signal is smaller than the first preset level signal, the first voltage comparator OA1 outputs a low-voltage detection signal of a low level, and at this time, the first light emitting diode LED1 is turned on after receiving the low-voltage detection signal of the low level, and outputs a first optical fault signal, and the detection circuit detects a low-voltage fault.
Optionally, the overvoltage detection module includes:
a second voltage comparison unit, which includes a second voltage comparator OA2, wherein an inverting input terminal of the second voltage comparator OA2 is used for obtaining a first voltage signal to be detected from the load module, a non-inverting input terminal of the second voltage comparator OA2 is used for obtaining a second preset level signal, and an output terminal of the second voltage comparator OA2 is used for outputting an overvoltage detection signal;
and the second fault signal unit comprises a second light-emitting diode (LED 2), the anode of the second LED2 is connected with the power supply, the cathode of the second LED2 is used for receiving the overvoltage detection signal, and the second LED2 outputs a second light fault signal based on the overvoltage detection signal.
By adopting the above technical scheme, the second voltage comparator OA2 is used to compare the second preset level signal with the first voltage signal to be detected obtained from the load module. When the first voltage signal to be detected is smaller than the second preset level signal, the second voltage comparator OA2 outputs a high-level overvoltage detection signal, and at this time, the second light emitting diode LED2 is not turned on after receiving the high-level overvoltage detection signal, and cannot output a second optical fault signal. When the first voltage signal to be detected is greater than the second preset level signal, the second voltage comparator OA2 outputs a low-level overvoltage detection signal, at this time, the second light emitting diode LED2 is turned on after receiving the low-level overvoltage detection signal, a second optical fault signal is output, and the detection circuit detects an overvoltage fault.
Optionally, the over-current detection module includes:
the amplifying unit is used for acquiring a second voltage signal to be detected from the load module, an amplifying output end is formed at the output end, and the amplifying output end is used for outputting an amplifying voltage signal;
a third voltage comparison unit, which comprises a third voltage comparator OA3, wherein an inverting input terminal of the third voltage comparator OA3 is used for obtaining the amplified voltage signal from the amplifying unit, a non-inverting input terminal of the third voltage comparator OA3 is used for obtaining a third preset level signal, and an output terminal of the third voltage comparator OA3 is used for outputting an over-current detection signal;
and the third fault signal unit comprises a third light-emitting diode LED3, the anode of the third light-emitting diode LED3 is connected with the power supply, the cathode of the third light-emitting diode LED3 is used for receiving the overcurrent detection signal, and the third light-emitting diode LED3 outputs a third light fault signal based on the overcurrent detection signal.
Optionally, the amplifying unit includes a first operational amplifier OA4, a fifth connecting resistor R5, a tenth voltage resistor R10 and an eleventh voltage dividing resistor R11, the fifth connecting resistor R5 is used for obtaining a second voltage signal to be detected, a non-inverting input terminal of the first operational amplifier OA4 is connected to the fifth connecting resistor R5, the tenth voltage resistor R10 and the eleventh voltage dividing resistor R11 are sequentially connected in series between an output terminal of the first operational amplifier OA4 and a ground, an inverting input terminal of the first operational amplifier OA4 is connected to a node formed between the tenth voltage resistor R10 and the eleventh voltage dividing resistor R11, and an output terminal of the first operational amplifier OA4 is formed with an amplifying output terminal for outputting an amplified voltage signal.
By adopting the technical scheme, in order to avoid overload damage, the second voltage signal to be detected output by the load module trunk output point is usually in the mV level, in order to improve the test precision, a user can control the test precision by controlling the amplification factor of the amplification unit, the amplification unit amplifies the second voltage signal to be detected and then outputs the amplified voltage signal, and the third voltage comparator OA3 compares the amplified voltage signal with a third preset level signal. When the amplified voltage signal is smaller than the third preset level signal, the third voltage comparator OA3 outputs a high-level over-current detection signal, and at this time, the third light emitting diode LED3 is not turned on after receiving the high-level over-current detection signal, and cannot output a third optical fault signal. When the amplified voltage signal is greater than the third preset level signal, the third voltage comparator OA3 outputs a low-level over-current detection signal, and at this time, the third light emitting diode LED3 is turned on after receiving the low-level over-current detection signal, and outputs a third light fault signal, and the detection circuit detects an over-current fault.
Optionally, the power supply further comprises a heat dissipation module, wherein the heat dissipation module comprises a heat dissipation fan, and the heat dissipation fan is connected between the power supply and the ground wire.
Through adopting above-mentioned technical scheme, radiator fan has improved the thermal diffusivity that detects the frock for detect the frock and can run for a long time and carry out the durability test in order to treat examining power module, and then the stability and the reliability of waiting to examine power module are examined in the test.
Optionally, the load module includes a first sampling resistor R1, a second sampling resistor R2, a load resistor RL, and a third sampling resistor RS;
the first sampling resistor R1 and the second sampling resistor R2 are sequentially connected in series between the positive electrode of the power module to be detected and the ground wire, the voltage division output node is formed between the first sampling resistor R1 and the second sampling resistor R2 and is used for outputting a first voltage signal to be detected;
one end of the load resistor RL is connected to the positive electrode of the power module to be tested, and the other end of the load resistor RL is connected to the third sampling resistor RS;
one end of the third sampling resistor RS is connected to the second sampling resistor R2, the other end of the third sampling resistor RS is connected to the negative electrode of the power module to be detected, a trunk output node is formed between the third sampling resistor RS and the negative electrode of the power module to be detected, and the trunk output node outputs a second voltage signal to be detected.
By adopting the technical scheme, the first sampling resistor R1 and the second sampling resistor R2 are sampling resistors of the first voltage signal to be detected and are used for obtaining a proper voltage value so as to improve the test precision of the detection circuit. And the first voltage signal to be detected is transmitted to the low-voltage detection unit from the voltage division output node to be compared with the first preset level signal, and is simultaneously transmitted to the overvoltage detection unit to be compared with the second preset level signal. When testing the auxiliary power supply with different voltages of the power module to be tested, the resistance values of the first sampling resistor R1 and the second sampling resistor R2 are different.
The load resistor RL is used for providing a load for the power module to be tested so as to test whether the power module to be tested can normally work under a loading environment.
And a trunk output node is formed between the third sampling resistor RS and the negative electrode of the power supply module to be detected, and outputs the second voltage signal to be detected.
Optionally, the protection device further comprises a protection module, wherein the protection module comprises:
the logic AND gate circuit comprises a first input end, a second input end and a third input end, wherein the first input end is connected with the output end of the low-voltage detection module and used for receiving a low-voltage detection signal, the second input end is connected with the output end of the overvoltage detection module and used for receiving an overvoltage detection signal, the third input end is connected with the output end of the overcurrent detection module and used for receiving an overcurrent detection signal, and the output end outputs a protection signal based on the detection signal received by the input end;
and the switch unit comprises an IR4427 chip and an NMOS switch tube QS, wherein the INA pin of the IR4427 chip is used for receiving a protection signal, the OUTA pin of the IR4427 chip is used for outputting a command signal, the gate of the NMOS switch tube QS is connected to the OUTA pin of the IR4427 chip to obtain the command signal, the source of the NMOS switch tube QS is connected to the third sampling resistor RS, and the drain of the NMOS switch tube QS is connected to the load resistor RL.
By adopting the technical scheme, when the auxiliary power supply output by the power supply module to be tested has a low-voltage fault, the low-voltage detection module outputs a low-voltage detection signal of a low level; when the auxiliary power supply output by the power supply module to be tested has an overvoltage fault, the overvoltage detection module outputs a low-level overvoltage detection signal; when the auxiliary power supply output by the power module to be tested has an overcurrent fault, the overcurrent detection module outputs a low-level overcurrent voltage detection signal. When the input end of the logic AND gate inputs the detection signal with non-high level, the logic AND gate outputs the protection signal with low level. At this time, the IR4427 chip outputs a low-level command signal, which cannot drive the NMOS switch tube QS to turn on, and the load resistor RL no longer operates. Because the load resistor RL is used for providing a load for the power supply module to be tested, the power generated by the load resistor RL in a circuit is larger, and when the auxiliary power supply output by the power supply module to be tested breaks down, the load resistor RL can be cut off in time to protect the detection tool.
When the auxiliary power supply output by the power supply module to be tested is normal, the low-voltage detection module outputs a high-level low-voltage detection signal, the overvoltage detection module outputs a high-level overvoltage detection signal, and the overcurrent detection module outputs a high-level overcurrent voltage detection signal. When the input ends of the logic AND gate are all high-level detection signals, the logic AND gate outputs high-level protection signals. At this time, the IR4427 chip outputs a high-level command signal, the high-level command signal drives the NMOS switch tube QS to turn on, and the load resistor RL works normally.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the power module to be tested is externally connected with a working power supply and outputs an auxiliary power supply, and a load module is connected between the anode and the cathode of the power module to be tested and can detect the load capacity of the auxiliary power supply.
2. The load module outputs a first voltage signal to be detected to the low-voltage detection module and the overvoltage detection module, and also outputs a second voltage signal to be detected to the overcurrent detection module, if the auxiliary power supply fails, the current fault or the voltage fault can be locked, and if the voltage of the auxiliary power supply fails, the voltage fault can be locked to be the overvoltage fault or the low-voltage fault. Therefore, the power module to be tested can be tested without returning to a production unit for on-line testing.
Drawings
FIG. 1 is a circuit diagram of a detection circuit of a detection tool for detecting a power module of an industrial personal computer in an embodiment of the application.
Description of the reference numerals:
1. a load module; 2. a low voltage detection module; 21. a first voltage comparison unit; 22. a first fault signaling unit; 3. an overvoltage detection module; 31. a second voltage comparison unit; 32. a second fault signaling unit; 4. an overcurrent detection module; 41. an amplifying unit; 42. a third voltage comparison unit; 43. a third fault signaling unit; 5. a heat dissipation module; 6. a protection module; 61. a switch unit.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings. 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.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the inventive concepts. Some of the figures in the present disclosure show structures and devices in block diagram form as part of this specification to avoid obscuring the disclosed principles. In the interest of clarity, not all features of an actual implementation are described in this specification. Moreover, the language used in the present disclosure has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter, resort to the claims being necessary to determine such inventive subject matter. Reference in the present disclosure to "one implementation" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the implementation is included in at least one implementation, and references to "one implementation" or "an implementation" are not to be understood as necessarily all referring to the same implementation.
The terms "a," "an," and "the" are not intended to refer to a singular entity, unless specifically limited, but rather include the general class of which a specific example may be used for illustration. Thus, use of the terms "a" or "an" can mean any number of at least one, including "a," one or more, "" at least one, "and" one or more than one. The term "or" means any of the alternatives, and any combination of alternatives, including all alternatives, unless the alternatives are explicitly indicated as mutually exclusive. The phrase "at least one of," when combined with a list of items, refers to a single item in the list or any combination of items in the list. The phrase does not require all of the listed items unless explicitly so limited.
The embodiment of the application discloses a detection circuit for detecting a detection tool of an industrial personal computer power module. Referring to fig. 1, the detection circuit of the detection tool for detecting the power module of the industrial personal computer comprises a load module 1, a low-voltage detection module 2, an overvoltage detection module 3, an overcurrent detection module 4, a heat dissipation module 5 and a protection module 6. The power module to be tested can be externally connected with DC24V to simulate the working state of the power module to be tested when the power module to be tested works on a production unit. The detection tool can be externally connected with a DC12V power supply to work. The load module 1 can obtain a signal to be detected from the power module to be detected, and provides a first voltage signal to be detected for the low-voltage detection module 2 and the overvoltage detection module 3 based on the signal to be detected, and provides a second voltage signal to be detected for the overcurrent detection module 4. The low voltage detection module 2 can compare the first preset voltage signal with the acquired first voltage signal to be detected, output a low voltage detection signal based on the comparison result, and output a fault signal based on the low voltage detection signal. The overvoltage detection module 3 can compare the second preset voltage signal with the acquired first voltage signal to be detected, output an overvoltage detection signal based on the comparison result, and output a fault signal based on the overvoltage detection signal. The over-current detection module 4 can output an over-current detection signal based on the second to-be-detected voltage signal and output a fault signal based on the over-current detection signal. The heat dissipation module 5 is used for improving the heat dissipation performance of the detection tool. The protection module 6 is used for protecting the detection tool when receiving a fault signal.
The load module 1 is used for providing a first voltage signal to be detected and a second voltage signal to be detected, and providing a load for the power supply module to be detected so as to test whether the power supply module to be detected can normally work under a loading environment. The load module 1 includes a first sampling resistor R1, a second sampling resistor R2, a load resistor RL and a third sampling resistor RS. The first sampling resistor R1 and the second sampling resistor R2 are sampling resistors of the first voltage signal to be detected, and are used for obtaining a proper voltage value, so as to improve the testing accuracy of the detection circuit. The first sampling resistor R1 and the second sampling resistor R2 are sequentially connected in series between the anode of the power module to be detected and the ground wire, a voltage division output node is formed between the first sampling resistor R1 and the second sampling resistor R2, and the voltage division output node is used for outputting a first voltage signal to be detected. The load resistor RL provides a load for the power module to be tested. One end of the load resistor RL is connected with the anode of the power module to be tested, and the other end is connected with the third sampling resistor RS through the protection module 6. The third sampling resistor RS is a sampling resistor for the second voltage signal to be detected. One end of the third sampling resistor RS is connected to the second sampling resistor R2, the other end of the third sampling resistor RS is connected to the negative electrode of the power module to be detected, a trunk output node is formed between the third sampling resistor RS and the negative electrode of the power module to be detected, and the trunk output node outputs a second voltage signal to be detected. It should be mentioned that, because the working current of the power module to be tested may reach 15A when being the largest, if the third sampling resistor RS sets up a larger resistance value, the power of the load module may be increased, and in order to avoid overload damage to the detection tool, the third sampling resistor RS that generally sets up a small resistance value is the sampling resistor of the over-current detection module 4. Because the power module that awaits measuring exports auxiliary power sources such as DC3.3V, DC5.1V, DC12V respectively when normally working, and the auxiliary power source's of different voltages power is different, therefore the resistance of first sampling resistor R1, second sampling resistor R2, load resistance RL and third sampling resistor RS is also different when detecting the auxiliary power source of different voltages.
The low-voltage detection module 2 is used for detecting low-voltage faults of the power supply module to be detected. When the auxiliary power supply normally works, the first to-be-detected voltage signal acquired by the low-voltage detection module 2 is greater than a first preset voltage signal, and the low-voltage detection module 2 outputs a high-level low-voltage detection signal. When the auxiliary power supply has a low-voltage fault, the first voltage signal to be detected acquired by the low-voltage detection module 2 is smaller than a first preset voltage signal, and the low-voltage detection module 2 can output a low-level low-voltage detection signal and output a fault signal.
In different embodiments, the low voltage detecting module 2 may be composed of different circuit units, and as an example, the low voltage detecting module 2 includes a first voltage comparing unit 21 and a first fault signal unit 22, where the first voltage comparing unit 21 is configured to receive a first voltage signal to be detected, compare the first preset voltage signal with the first voltage signal to be detected, and output a low voltage detecting signal based on a comparison result. The first fault signal unit 22 is configured to receive a low voltage detection signal, and when receiving the low voltage detection signal of a low level, the first fault signal unit 22 outputs a fault signal.
The present application specifically but not by way of limitation proposes a first voltage comparing unit 21, where the first voltage comparing unit 21 includes a first voltage comparator OA1, a third connecting resistor R3, a sixth voltage dividing resistor R6, and a seventh voltage dividing resistor R7. The third connecting resistor R3 is connected to the voltage dividing output node for obtaining the first voltage signal to be detected from the load module 1, and the non-inverting input terminal of the first voltage comparator OA1 is connected to the third connecting resistor R3. The sixth voltage-dividing resistor R6 and the seventh voltage-dividing resistor R7 are sequentially connected, the sixth voltage-dividing resistor R6 is connected with a power supply, the seventh voltage-dividing resistor R7 is grounded, and the inverted input end is connected with an output node formed between the sixth voltage-dividing resistor R6 and the seventh voltage-dividing resistor R7 so as to obtain a first preset level signal. The output terminal of the first voltage comparator OA1 is used to output a low voltage detection signal. When the first to-be-detected voltage signal is greater than the first preset level signal, the first voltage comparator OA1 outputs a low voltage detection signal of a high level. When the first to-be-detected voltage signal is smaller than the first preset level signal, the first voltage comparator OA1 outputs a low voltage detection signal of a low level. Meanwhile, a specific but non-limiting solution of the first fault signal unit 22 is proposed, where the first fault signal unit 22 includes a first light emitting diode LED1, an anode of the first light emitting diode LED1 is connected to a power supply, a cathode of the first light emitting diode LED1 is used for receiving a low voltage detection signal, the first light emitting diode LED1 outputs a first light fault signal when receiving the low voltage detection signal of a low level, and a detection circuit detects a low voltage fault.
The overvoltage detection module 3 is used for detecting overvoltage faults of the power supply module to be detected. When the auxiliary power supply normally works, the first to-be-detected voltage signal acquired by the overvoltage detection module 3 is smaller than the second preset voltage signal, and the overvoltage detection module 3 outputs a high-level overvoltage detection signal. When the auxiliary power supply has an overvoltage fault, the first voltage signal to be detected acquired by the overvoltage detection module 3 is greater than the second preset voltage signal, and the overvoltage detection module 3 can output a low-level overvoltage detection signal and output a fault signal.
The present application proposes, in particular but not exclusively, an overvoltage detection module 3, the overvoltage detection module 3 comprising a second voltage comparison unit 31 and a second fault signaling unit 32. As an example, the second voltage comparing unit 31 includes a second voltage comparator OA2, a fourth connection resistor R4, an eighth voltage-dividing resistor R8, and a ninth voltage-dividing resistor R9. The fourth connecting resistor R4 is connected to the voltage dividing output node for obtaining the first voltage signal to be detected from the load module 1, and the inverting input terminal of the second voltage comparator OA2 is connected to the fourth connecting resistor R4. The eighth voltage-dividing resistor R8 and the ninth voltage-dividing resistor R9 are sequentially connected, the eighth voltage-dividing resistor R8 is connected to the power supply, the ninth voltage-dividing resistor R9 is grounded, and the non-inverting input terminal of the second voltage comparator OA2 is connected to an output node formed between the eighth voltage-dividing resistor R8 and the ninth voltage-dividing resistor R9 to obtain a second preset level signal. The output of the second voltage comparator OA2 is used to output an overvoltage detection signal. The second fault signal unit 32 includes a second light emitting diode LED2, an anode of the second light emitting diode LED2 is connected to the power supply, a cathode of the second light emitting diode LED2 is used for receiving the overvoltage detection signal, and the second light emitting diode LED2 outputs a second optical fault signal when receiving the low-level overvoltage detection signal.
When the first voltage signal to be detected is smaller than the second preset level signal, the second voltage comparator OA2 outputs a high level overvoltage detection signal. When the first voltage signal to be detected is greater than the second preset level signal, the second voltage comparator OA2 outputs a low-level overvoltage detection signal, and meanwhile, the second light emitting diode LED2 receives the low-level overvoltage detection signal and outputs a second optical fault signal, and the detection circuit detects an overvoltage fault.
The overcurrent detection module 4 is used for detecting overcurrent faults of the power supply module to be detected. In order to avoid overload damage, the resistance value of the third sampling resistor RS, which is used for taking the value of the second voltage signal to be detected, is usually set to be small, so that the second voltage signal to be detected output by the main circuit output point is usually in mV level, in order to improve the test accuracy, an amplifying unit 41 is usually arranged in the overcurrent detection module 4, and a user can control the test accuracy by controlling the amplification factor of the amplifying unit 41.
In particular but not exclusively, an amplifying unit 41 is proposed, comprising a first operational amplifier OA4, a fifth connecting resistor R5, a tenth voltage-dividing resistor R10 and an eleventh voltage-dividing resistor R11. And the fifth connecting resistor R5 is connected to the trunk output point and is used for acquiring a second voltage signal to be detected. The non-inverting input of the first operational amplifier OA4 is connected to the fifth connecting resistor R5. The tenth voltage-dividing resistor R10 and the eleventh voltage-dividing resistor R11 are sequentially connected in series between the output terminal of the first operational amplifier OA4 and the ground, and the inverting input terminal of the first operational amplifier OA4 is connected to an output point formed by the tenth voltage-dividing resistor R10 and the eleventh voltage-dividing resistor R11. The output of the first operational amplifier OA4 is formed with an amplified output for outputting the processed amplified voltage signal.
The over-current detection module 4 further includes a third voltage comparison unit 42 and a third fault signal unit 43. As an example, the third voltage comparing unit 42 includes a third voltage comparator OA3, a twelfth connecting resistor R12, a thirteenth voltage dividing resistor R13, and a fourteenth voltage dividing resistor R14. The twelfth connecting resistor R12 is connected to the output terminal of the first operational amplifier OA4 for obtaining the amplified voltage signal from the output terminal of the first operational amplifier OA4, and the inverting input terminal of the third voltage comparator OA3 is connected to the twelfth connecting resistor R12. The thirteenth voltage-dividing resistor R13 and the fourteenth voltage-dividing resistor R14 are sequentially connected, the thirteenth voltage-dividing resistor R13 is connected to the power supply, the fourteenth voltage-dividing resistor R14 is grounded, and the non-inverting input terminal of the third voltage comparator OA3 is connected to an output node formed between the thirteenth voltage-dividing resistor R13 and the fourteenth voltage-dividing resistor R14 to obtain a third preset level signal. The output terminal of the third voltage comparator OA3 is used to output an over-current detection signal. The third fault signal unit 43 includes a third light emitting diode LED3, an anode of the third light emitting diode LED3 is connected to the power supply, a cathode of the third light emitting diode LED3 is configured to receive the over-current detection signal, and the third light fault signal is output when the third light emitting diode LED3 receives the low-level over-current detection signal.
When the amplified voltage signal is less than the third preset level signal, the third voltage comparator OA3 outputs an over-current detection signal of a high level. When the amplified voltage signal is greater than the third preset level signal, the third voltage comparator OA3 outputs a low level over-current detection signal, and at the same time, the third light emitting diode LED3 receives the low level over-current detection signal and outputs a third light failure signal, and the detection circuit detects an over-current failure.
In order to make the detection frock can run for a long time and carry out the durability test in order to treat the power module of examining, and then the stability and the reliability of treating the power module are examined in the test. The detection circuit is provided with a heat dissipation module 5, the heat dissipation module 5 comprises a heat dissipation fan, and the heat dissipation fan is connected between a power supply and a ground wire so as to improve the heat dissipation performance of the detection tool.
The protection module 6 is used for cutting off the load resistance RL when the detection module detects the fault of the power supply module to be detected, and because the load resistance RL is used for providing a load for the power supply module to be detected, the power generated by the load resistance RL in a circuit is larger, and when the auxiliary power supply output by the power supply module to be detected has a fault, the load resistance RL is cut off in time to protect the detection tool. In particular, but not by way of limitation, a solution for the protection module 6 is proposed, comprising a logic and circuit and a switching unit 61. The first input terminal of the and logic circuit is connected to the output terminal of the first voltage comparator OA1 for receiving the low voltage detection signal, the second input terminal is connected to the output terminal of the second voltage comparator OA2 for receiving the overvoltage detection signal, the third input terminal is connected to the output terminal of the third voltage comparator OA3 for receiving the overcurrent detection signal, and the output terminal outputs the protection signal based on the detection signal received at the input terminal.
As an example, the switch unit 61 includes an IR4427 chip and an NMOS switch QS. The INA pin of the IR4427 chip is used for receiving a protection signal, the OUTA pin of the IR4427 chip is used for outputting an instruction signal, the GND pin of the IR4427 chip is grounded, and the VS pin of the IR4427 chip is connected with a power supply. The grid electrode of the NMOS switch tube QS is connected to the OUTA pin of the IR4427 chip and used for acquiring a command signal, the source electrode of the NMOS switch tube QS is connected to the RS resistor, and the drain electrode of the NMOS switch tube QS is connected to the RL resistor. In order to enable the NMOS switch tube QS to operate more stably, the grid electrode of the NMOS switch tube QS is connected with a voltage stabilizing diode Dz, and the other end of the voltage stabilizing diode is connected with the source electrode of the NMOS switch tube QS. In order to protect the NMOS switch tube QS, a capacitor and a twenty-fifth resistor R25 are connected between the source and the drain of the NMOS switch tube QS.
When the auxiliary power supply output by the power supply module to be tested has a low-voltage fault, the first voltage comparator OA1 outputs a low-voltage detection signal of a low level; when the auxiliary power supply output by the power supply module to be tested has an overvoltage fault, the second voltage comparator OA2 outputs a low-level overvoltage detection signal; when the auxiliary power supply output by the power module to be tested has an overcurrent fault, the third voltage comparator OA3 outputs a low-level overcurrent voltage detection signal. When the input end of the logic AND gate inputs the detection signal with non-high level, the logic AND gate outputs the protection signal with low level. At this time, the IR4427 chip outputs a low-level command signal, which cannot drive the NMOS switching tube QS to turn on, and the load resistor RL no longer works.
When the auxiliary power supply output by the power supply module to be tested is normal, the first voltage comparator OA1 outputs a low-voltage detection signal with a high level, the second voltage comparator OA2 outputs an overvoltage detection signal with a high level, and the third voltage comparator OA3 outputs an overcurrent detection signal with a high level. And when the input ends of the logic AND gates are all high-level detection signals, the logic AND gates output high-level protection signals. At this time, the IR4427 chip outputs a high-level command signal, which drives the NMOS switch tube QS to turn on, and the load resistor RL works normally.
It is worth mentioning that the auxiliary power supplies such as DC3.3V, DC5.1V, DC + -12V are respectively output when the power supply module to be tested works normally. The power of the auxiliary power supplies with different voltages is different, so that when the auxiliary voltage with different voltages is detected, the related resistor and the preset voltage are both adaptively adjusted according to the voltage value of the auxiliary power supply.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a detection circuitry for detecting industrial computer power module's detection frock which characterized in that includes:
the load module (1) is connected with the power supply module to be detected, and is used for acquiring a signal to be detected from the power supply module to be detected, outputting a first voltage signal to be detected through a voltage division output node based on the signal to be detected, and outputting a second voltage signal to be detected through a trunk output node;
the low-voltage detection module (2) is used for acquiring a first voltage signal to be detected from the load module (1), comparing a first preset voltage signal with the acquired first voltage signal to be detected, and outputting a low-voltage detection signal based on a comparison result;
the overvoltage detection module (3) is used for acquiring a first voltage signal to be detected from the load module (1), comparing a second preset voltage signal with the acquired first voltage signal to be detected, and outputting an overvoltage detection signal based on a comparison result;
and the overcurrent detection module (4) is used for acquiring a second voltage signal to be detected from the load module (1) and outputting an overcurrent detection signal based on the second voltage signal to be detected.
2. The detection circuit for detecting the detection tool of the industrial personal computer power module as claimed in claim 1, wherein the low-voltage detection module (2) comprises:
the first voltage comparison unit (21), the first voltage comparison unit (21) includes a first voltage comparator OA1, a non-inverting input terminal of the first voltage comparator OA1 is used for obtaining a first voltage signal to be detected from the load module (1), an inverting input terminal of the first voltage comparator OA1 is used for obtaining a first preset level signal, and an output terminal of the first voltage comparator OA1 is used for outputting a low voltage detection signal;
the first fault signal unit (22), the first fault signal unit (22) includes a first light emitting diode LED1, the positive pole of the first light emitting diode LED1 is connected with the power supply, the negative pole of the first light emitting diode LED1 is used for receiving the low voltage detection signal, and the first light emitting diode LED1 outputs a first light fault signal based on the low voltage detection signal.
3. The detection circuit for detecting the detection tool of the industrial personal computer power module as claimed in claim 1, wherein the overvoltage detection module (3) comprises:
a second voltage comparison unit (31), wherein the second voltage comparison unit (31) comprises a second voltage comparator OA2, an inverting input terminal of the second voltage comparator OA2 is used for obtaining a first voltage signal to be detected from the load module (1), a non-inverting input terminal of the second voltage comparator OA2 is used for obtaining a second preset level signal, and an output terminal of the second voltage comparator OA2 is used for outputting an overvoltage detection signal;
the second fault signal unit (32), the second fault signal unit (32) is including second emitting diode LED2, the positive pole of second emitting diode LED2 is connected with the power, the negative pole of second emitting diode LED2 is used for receiving the excessive pressure detection signal, second emitting diode LED2 is based on the excessive pressure detection signal output second light fault signal.
4. The detection circuit for detecting the detection tool of the industrial personal computer power module as claimed in claim 1, wherein the over-current detection module (4) comprises:
the amplifying unit (41) is used for acquiring a second voltage signal to be detected from the load module (1), an amplifying output end is formed at the output end, and the amplifying output end is used for outputting the amplifying voltage signal;
a third voltage comparison unit (42), wherein the third voltage comparison unit (42) comprises a third voltage comparator OA3, an inverting input terminal of the third voltage comparator OA3 is used for obtaining the amplified voltage signal from the amplifying unit (41), a non-inverting input terminal of the third voltage comparator OA3 is used for obtaining a third preset level signal, and an output terminal of the third voltage comparator OA3 is used for outputting an overcurrent detection signal;
and the third fault signal unit (43), the third fault signal unit (43) comprises a third light emitting diode (LED 3), the anode of the third LED (LED 3) is connected with a power supply, the cathode of the third LED (LED 3) is used for receiving an overcurrent detection signal, and the third LED (LED 3) outputs a third optical fault signal based on the overcurrent detection signal.
5. The detection circuit for detecting the detection tool of the industrial personal computer power module according to claim 4, wherein the amplification unit (41) comprises a first operational amplifier OA4, a fifth connecting resistor R5, a tenth voltage resistor R10 and an eleventh voltage dividing resistor R11, the fifth connecting resistor R5 is used for obtaining a second voltage signal to be detected, a non-inverting input end of the first operational amplifier OA4 is connected to the fifth connecting resistor R5, the tenth voltage resistor R10 and the eleventh voltage dividing resistor R11 are sequentially connected in series between an output end of the first operational amplifier OA4 and a ground wire, an inverting input end of the first operational amplifier OA4 is connected to a node formed between the tenth voltage resistor R10 and the eleventh voltage dividing resistor R11, and an amplification output end is formed at an output end of the first operational amplifier OA4 and used for outputting an amplified voltage signal.
6. The detection circuit for detecting the detection tool of the industrial personal computer power module as claimed in claim 1, further comprising a heat dissipation module (5), wherein the heat dissipation module (5) comprises a heat dissipation fan, and the heat dissipation fan is connected between the power supply and the ground wire.
7. The detection circuit of the detection tool for detecting the power supply module of the industrial personal computer according to claim 1, wherein the load module (1) comprises a first sampling resistor R1, a second sampling resistor R2, a load resistor RL and a third sampling resistor RS;
the first sampling resistor R1 and the second sampling resistor R2 are sequentially connected in series between the anode and the ground wire of the power module to be detected, the voltage division output node is formed between the first sampling resistor R1 and the second sampling resistor R2, and the voltage division output node is used for outputting a first voltage signal to be detected;
one end of the load resistor RL is connected to the positive electrode of the power module to be tested, and the other end of the load resistor RL is connected to the third sampling resistor RS;
one end of the third sampling resistor RS is connected to the second sampling resistor R2, the other end of the third sampling resistor RS is connected to the negative electrode of the power module to be detected, a trunk output node is formed between the third sampling resistor RS and the negative electrode of the power module to be detected, and the trunk output node outputs a second voltage signal to be detected.
8. The detection circuit for detecting the detection tool of the industrial personal computer power module according to claim 7, further comprising a protection module (6), wherein the protection module (6) comprises:
the logic AND gate circuit comprises a first input end, a second input end and a third input end, wherein the first input end is connected with the output end of the low-voltage detection module (2) and used for receiving a low-voltage detection signal, the second input end is connected with the output end of the overvoltage detection module (3) and used for receiving an overvoltage detection signal, the third input end is connected with the output end of the overcurrent detection module (4) and used for receiving an overcurrent detection signal, and the output end outputs a protection signal based on the detection signal received by the input end;
the switch unit (61) comprises an IR4427 chip and an NMOS switch tube QS, the INA pin of the IR4427 chip is used for receiving a protection signal, the OUTA pin of the IR4427 chip is used for outputting a command signal, the grid electrode of the NMOS switch tube QS is connected with the OUTA pin of the IR4427 chip to obtain the command signal, the source electrode of the NMOS switch tube QS is connected with the third sampling resistor RS, and the drain electrode of the NMOS switch tube QS is connected with the load resistor RL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222915116.0U CN218630131U (en) | 2022-11-02 | 2022-11-02 | Detection circuit for detecting tool of industrial personal computer power module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222915116.0U CN218630131U (en) | 2022-11-02 | 2022-11-02 | Detection circuit for detecting tool of industrial personal computer power module |
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| Publication Number | Publication Date |
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| CN218630131U true CN218630131U (en) | 2023-03-14 |
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| CN202222915116.0U Active CN218630131U (en) | 2022-11-02 | 2022-11-02 | Detection circuit for detecting tool of industrial personal computer power module |
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| CN (1) | CN218630131U (en) |
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