CN213518190U - Device for eliminating interference of cross-board signal - Google Patents
Device for eliminating interference of cross-board signal Download PDFInfo
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- CN213518190U CN213518190U CN202022443209.9U CN202022443209U CN213518190U CN 213518190 U CN213518190 U CN 213518190U CN 202022443209 U CN202022443209 U CN 202022443209U CN 213518190 U CN213518190 U CN 213518190U
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Abstract
The utility model provides a device for eliminating interference of a cross-board signal, which comprises a power supply module and a main board; one path of the output end of the power supply module is connected with a first input end of a voltage comparison module on the mainboard; the second input end of the voltage comparison module is connected with a reference power supply; one path of the output end of the voltage comparison module is connected with the main board CPLD, and the other path of the output end of the voltage comparison module is connected with a second pull-up voltage through a second pull-up resistor. The voltage comparison module adopts a comparator, the voltage of a first input end of the comparator is greater than the voltage of a second input end of the comparator, and the reference power supply can supply power by using a power supply which is already arranged on the mainboard. The invention utilizes the comparator to compare the input signal with the reference voltage value, and further filters the voltage rise and noise interference on the signal. On one hand, the reliability of signal transmission can be improved, and the phenomenon of false triggering is avoided; on the other hand, the protection effect is also played to the chip IO port of the mainboard, and the IO port damage caused by various interference noise impact can not occur.
Description
Technical Field
The utility model belongs to the technical field of the server is anti-interference, in particular to a device that is used for striding board signal to remove interference.
Background
The server mainboard is supplied power by PSU, and PSU also can cause various interference to the mainboard signal when providing 12V power for the mainboard, and PSU's noise also can grow along with output improves, and the noise. For system management power supply, there are many signal interactions between the PSU and the motherboard: for example, there are AC _ FAIL signal (signal indicating whether there is power failure in the utility), AC _ PWROK signal (signal indicating that the PSU is working normally), AC _ Alert signal (indicating that the PSU has an alarm), AC _ SDA and AC _ SCL (indicating that the PSU is communicating via I2C, and the motherboard can read various status information of the PSU via the set of I2C signal lines), and so on. Generally, the signals are connected to a 3.3V power supply through a pull-up resistor and are set high, and a single chip microcomputer or a server mainboard CPLD (complex programmable logic device) in a PSU (programmable system unit) is set low through an IO (input/output) port or is set low through controlling an MOS (metal oxide semiconductor) tube.
Fig. 1 is a schematic diagram illustrating connection of 1 signal transmitted from a PSU to a motherboard in the prior art. The potential at the point a in the figure is actually a potential obtained by dividing the voltage between the pull-up resistor and Q1 and superimposing the divided voltage on various disturbances. Assuming that the pull-up resistance is 1.5K and the impedance at which Q1 is on is 50 ohms, then the voltage detected on the motherboard is at least 0.1V of electricity. However, the working condition of actual operation is more complicated, as shown in the following figure, in a waveform low-level state, the voltage divided by the pull-up resistor and the Q1 is 0.46V, and the superimposed interference is more than 0.6V-0.7V, while the IO port on the main board CPLD is regarded as a high level when the voltage is more than about 0.9V, and only has a margin of 0.2-0.3V. Under the condition of high power, the superposed interference and noise are larger, so that the superposed signal has the risk of being triggered to the high level by mistake in the low level state. At present, in server application, interference is generally filtered by an RC filtering mode, but there is still a problem in this way, firstly, an RC filtering circuit can cause signal delay, secondly, the RC filtering can only filter interference, but cannot filter a basic voltage division value.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a device for striding board signal removes interference utilizes comparator comparison input signal and reference voltage value, and then filters voltage lifting and noise disturbance on the signal.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for cross-board signal interference elimination comprises a power supply module and a main board; one path of the output end of the power supply module is connected with a first input end of a voltage comparison module on the mainboard; the second input end of the voltage comparison module is connected with a reference power supply; one path of the output end of the voltage comparison module is connected with the main board CPLD, and the other path of the output end of the voltage comparison module is connected with a second pull-up voltage through a second pull-up resistor.
Further, the voltage comparison module adopts a comparator.
Further, a power supply input end of the comparator is connected with a second pull-up voltage; the comparator is also connected to ground.
Further, the voltage of the first input end of the comparator is greater than the voltage of the second input end of the comparator.
Further, the second pull-up voltage is 3.3V.
Further, the power supply module comprises a singlechip and an N communication MOS tube;
the output pin of the single chip microcomputer is also connected with the grid electrode of the MOS tube through the N communication; one path of a drain electrode of the N communication MOS tube is connected with a first input end of a voltage comparison module on the mainboard, and the other path of the drain electrode of the N communication MOS tube is connected with a first pull-up voltage through a first pull-up resistor; the source electrode of the N communication MOS tube is connected with the ground, and the source electrode is also connected with the anode of the diode; and the cathode of the diode is connected with the drain electrode.
Further, the first pull-up voltage is 3.3V.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the utility model provides a device for eliminating interference of a cross-board signal, which comprises a power supply module and a main board; one path of the output end of the power supply module is connected with a first input end of a voltage comparison module on the mainboard; the second input end of the voltage comparison module is connected with a reference power supply; one path of the output end of the voltage comparison module is connected with the main board CPLD, and the other path of the output end of the voltage comparison module is connected with a second pull-up voltage through a second pull-up resistor. The voltage comparison module adopts a comparator. The power supply module comprises a singlechip and an N communication MOS tube; the output pin of the singlechip is also connected with the grid of the MOS tube through the N communication; one path of a drain electrode of the N communication MOS tube is connected with a first input end of a voltage comparison module on the mainboard, and the other path of the drain electrode of the N communication MOS tube is connected with a first pull-up voltage through a first pull-up resistor; the source electrode of the N communication MOS tube is connected with the ground, and the source electrode is also connected with the anode of the diode; the cathode of the diode is connected with the drain electrode. The invention utilizes the comparator to compare the input signal with the reference voltage value, and further filters the voltage rise and noise interference on the signal. On one hand, the reliability of signal transmission can be improved, and the phenomenon of false triggering is avoided; on the other hand, the protection effect is also played to the chip IO port of the mainboard, and the IO port damage caused by various interference noise impact can not occur.
Drawings
Fig. 1 is a schematic diagram illustrating connection of 1 signal transmitted from a PSU to a motherboard in the prior art;
fig. 2 is a schematic connection diagram of an apparatus for removing interference from a cross-board signal according to embodiment 1 of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
Example 1
The embodiment 1 of the utility model provides a device that is used for striding board signal to remove interference, does as figure 2 the utility model discloses embodiment 1 a device that is used for striding board signal to remove interference connects the schematic diagram.
The device comprises a power supply module and a mainboard; one path of the output end of the power supply module is connected with a first input end of a voltage comparison module on the mainboard; the second input end of the voltage comparison module is connected with a reference power supply; one path of the output end of the voltage comparison module is connected with the main board CPLD, and the other path of the output end of the voltage comparison module is connected with a second pull-up voltage through a second pull-up resistor.
The voltage comparison module adopts a comparator.
The power supply input end of the comparator is connected with the second pull-up voltage comparator and is also connected with the ground.
The voltage at the first input terminal of the comparator is greater than the voltage at the second input terminal of the comparator.
The second pull-up voltage is 3.3V.
The power supply module comprises a singlechip and an N communication MOS tube.
The output pin of the singlechip is also connected with the grid of the MOS tube through the N communication; one path of a drain electrode of the N communication MOS tube is connected with a first input end of a voltage comparison module on the mainboard, and the other path of the drain electrode of the N communication MOS tube is connected with a first pull-up voltage through a first pull-up resistor; the source electrode of the N communication MOS tube is connected with the ground, and the source electrode is also connected with the anode of the diode; the cathode of the diode is connected with the drain electrode, and the first pull-up voltage is 3.3V.
On the mainboard, the signal that comes from PSU compares with a reference power supply through the comparator, assumes to set up the reference voltage to be 2V, then just can export for high when the signal that comes from PSU is greater than 2V voltage, just so has avoided the risk that the low level triggers by mistake. Meanwhile, when the MOS tube is conducted, the OD gate in the comparator has very small impedance, and does not have very large impedance like an IO port of a triode or a singlechip. There is essentially no voltage division, the voltage low level to the CPLD is essentially 0v, and the comparator delay is around 1-2us, which has no effect on signal transfer.
Because there are multiple circuit electricity on the mainboard under normal circumstances, for example 1.2V, 1.8V etc., the power that already exists on the mainboard can be used to supply power to the benchmark power in this scheme, can further reduce cost.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto. Various modifications and alterations will occur to those skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. On the basis of the technical scheme of the utility model, various modifications or deformations that technical personnel in the field need not pay out creative work and can make still are within the protection scope of the utility model.
Claims (7)
1. The device for eliminating the interference of the cross-board signal is characterized by comprising a power supply module and a main board; one path of the output end of the power supply module is connected with a first input end of a voltage comparison module on the mainboard; the second input end of the voltage comparison module is connected with a reference power supply; one path of the output end of the voltage comparison module is connected with the main board CPLD, and the other path of the output end of the voltage comparison module is connected with a second pull-up voltage through a second pull-up resistor.
2. The apparatus according to claim 1, wherein the voltage comparison module employs a comparator.
3. The apparatus according to claim 2, wherein the power input terminal of the comparator is connected to a second pull-up voltage; the comparator is also connected to ground.
4. The apparatus of claim 2, wherein the voltage at the first input terminal of the comparator is greater than the voltage at the second input terminal of the comparator.
5. The apparatus of claim 1, wherein the second pull-up voltage is 3.3V.
6. The device according to claim 1, wherein the power supply module comprises a single chip microcomputer and an N communication MOS transistor;
an output pin of the singlechip is connected with a grid electrode of the N communication MOS tube; one path of a drain electrode of the N communication MOS tube is connected with a first input end of a voltage comparison module on the mainboard, and the other path of the drain electrode of the N communication MOS tube is connected with a first pull-up voltage through a first pull-up resistor; the source electrode of the N communication MOS tube is connected with the ground, and the source electrode is also connected with the anode of the diode; and the cathode of the diode is connected with the drain electrode.
7. The apparatus of claim 6, wherein the first pull-up voltage is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022443209.9U CN213518190U (en) | 2020-10-28 | 2020-10-28 | Device for eliminating interference of cross-board signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022443209.9U CN213518190U (en) | 2020-10-28 | 2020-10-28 | Device for eliminating interference of cross-board signal |
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| Publication Number | Publication Date |
|---|---|
| CN213518190U true CN213518190U (en) | 2021-06-22 |
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| CN202022443209.9U Active CN213518190U (en) | 2020-10-28 | 2020-10-28 | Device for eliminating interference of cross-board signal |
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| CN (1) | CN213518190U (en) |
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- 2020-10-28 CN CN202022443209.9U patent/CN213518190U/en active Active
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