CN218886017U - Overvoltage alarm device of circuit board - Google Patents
Overvoltage alarm device of circuit board Download PDFInfo
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- CN218886017U CN218886017U CN202223608054.5U CN202223608054U CN218886017U CN 218886017 U CN218886017 U CN 218886017U CN 202223608054 U CN202223608054 U CN 202223608054U CN 218886017 U CN218886017 U CN 218886017U
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Abstract
The utility model provides an overvoltage alarm device of circuit board, include: the device comprises a voltage reduction module, an optical coupler, a rectifier, a delay switch, an alarm module and a power module; the voltage reduction module is connected with a plurality of power output ends on the circuit board; a voltage detection loop is arranged in the device, and the voltage reduction module, the optical coupler, the rectifier, the time delay switch, the alarm module and the power module are connected through the voltage detection loop. The utility model discloses a set of voltage detection return circuit integrates each group's voltage on with the circuit board, when arbitrary group's voltage was too high, can in time send alarm signal.
Description
Technical Field
The utility model relates to a circuit board voltage detection technical field, more specifically the overvoltage alarm device who relates to a circuit board that says so.
Background
At present, in various system devices, the rear end is provided with various circuit boards, each circuit board may have several groups of power supplies to provide different devices or chips, if the power supply voltage on the main board is abnormal, the baseboard management controller BMC may detect the power supply voltage on the main board, or the power supply management chip may protect the devices on the various circuit boards by its own over-voltage protection (OVP) function. However, if the voltage detection is not connected back to the BMC, the system cannot detect whether the voltage of the circuit board is normal.
At present, the overvoltage detection and protection schemes for the circuit board have the following two types:
1. each group of power supply on the circuit board is connected with a voltage detection signal to the BMC on the mainboard or the main control board, and the BMC detects that the voltage is too high and directly turns off the power supply management chip.
2. If the power management chip detects that the output voltage is too high, generally 1.2 times higher than the set value, the power management chip is directly turned off.
However, in practical applications, because of the cost and the circuit complexity, the voltage of each group of power supplies on the circuit board is not detected and connected to the BMC. If the over-voltage protection (OVP) function on the power management chip is utilized, the protection voltage of a chip manufacturer is generally set to be 1.2 times of the set voltage, and if the voltage on a circuit board falls within 1.2 times of the set value, the over-voltage protection cannot be triggered.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model aims to provide an overvoltage alarm device of circuit board integrates each group's voltage on the circuit board through a set of voltage detection return circuit, when arbitrary group's voltage is too high, can in time send alarm signal.
The utility model discloses a realize above-mentioned purpose, realize through following technical scheme:
an overvoltage warning device for a circuit board, comprising: the device comprises a voltage reduction module, an optical coupler, a rectifier, a delay switch, an alarm module and a power module; the voltage reduction module is connected with a plurality of power output ends on the circuit board; a voltage detection loop is arranged in the device, and the voltage reduction module, the optical coupler, the rectifier, the time delay switch, the alarm module and the power module are connected through the voltage detection loop.
Further, the voltage detection circuit includes: the optical coupler is respectively connected with the voltage reduction module, the rectifier and the delay switch, the power supply module is respectively connected with the optical coupler, the rectifier and the alarm module, and the delay switch is respectively connected with the rectifier and the alarm module.
Furthermore, three power output ends are arranged on the circuit board and comprise a first power output end, a second power output end and a third power output end, and the voltage reduction module is connected with the first power output end, the second power output end and the third power output end respectively.
Further, the voltage reduction module comprises a resistor R1, a resistor R2, a resistor R3, a diode ZD1, a diode ZD2 and a diode ZD3; the voltage detection circuit includes: one end of the resistor R1 is connected with the output end of the first power supply, and the other end of the resistor R1 is connected with the cathode of the diode ZD 1; one end of the resistor R2 is connected with the output end of the second power supply, and the other end of the resistor R2 is connected with the cathode of the diode ZD 2; one end of the resistor R3 is connected with the output end of the first power supply, and the other end of the resistor R3 is connected with the cathode of the diode ZD3; the anode of the diode ZD1 is connected to the anode of the diode ZD2, the diode ZD3, and the photocoupler, respectively.
Further, the voltage detection circuit further comprises: one pin of the optical coupler U1 is connected with the anode of the diode ZD1, two pins of the optical coupler U1 are grounded, the three pins of the optical coupler U1 are connected with the power supply module, and the four pins of the optical coupler U1 are connected with the rectifier.
Further, the power module comprises a resistor R4, a resistor R5, a resistor R6 and a diode ZD4, and the alarm module adopts a light emitting diode; the voltage detection circuit further includes: the 12V power supply is respectively connected with one end of a resistor R4, one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R4 is connected with a cathode of a diode ZD4, an anode of the diode ZD4 is connected with a three-pin of an optocoupler U1, the other end of the resistor R5 is respectively connected with an input end of a rectifier SCR and four pins of the optocoupler U1, and the other end of the resistor R6 is connected with an anode of a light-emitting diode LED.
Further, the voltage detection circuit further includes: one pin of the delay switch U2 is connected with the output end of the rectifier SCR and the cathode of the diode D1 respectively, two pins of the delay switch U2 are connected with the cathode of the light emitting diode LED, and the three pins of the delay switch U2, the four pins of the delay switch U2 and the anode of the diode D1 are grounded respectively.
Furthermore, the alarm module adopts a light emitting diode or a buzzer.
Contrast prior art, the utility model discloses beneficial effect lies in: the utility model discloses an overvoltage alarm device of circuit board integrates each group's voltage on the circuit board through a set of voltage detection return circuit, sets for the overvoltage warning function on the circuit board by oneself, need not to set for through the overvoltage on mainboard or the power management chip, when arbitrary group's voltage is too high, can in time send alarm signal, the effectual overvoltage alarm suggestion that has realized the circuit board has guaranteed circuit assembly's safety.
Therefore, compared with the prior art, the utility model has the substantive characteristics and the progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an electrical block diagram of an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a voltage detection circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
An overvoltage alarm device of a circuit board as shown in fig. 1 includes: the device comprises a voltage reduction module, an optical coupler, a rectifier, a delay switch, an alarm module and a power module; the voltage reduction module is connected with a plurality of power output ends on the circuit board; a voltage detection loop is arranged in the device, and the voltage reduction module, the optical coupler, the rectifier, the time delay switch, the alarm module and the power module are connected through the voltage detection loop. The voltage detection circuit includes: the optical coupler is respectively connected with the voltage reduction module, the rectifier and the delay switch, the power supply module is respectively connected with the optical coupler, the rectifier and the alarm module, and the delay switch is respectively connected with the rectifier and the alarm module.
The circuit board is provided with three power output ends, the three power output ends comprise a first power output end, a second power output end and a third power output end, and the voltage reduction module is connected with the first power output end, the second power output end and the third power output end respectively.
As an example, the voltage reduction module includes a resistor R1, a resistor R2, a resistor R3, a diode ZD1, a diode ZD2, and a diode ZD3; the power module comprises a resistor R4, a resistor R5, a resistor R6 and a diode ZD4, and the alarm module adopts a light-emitting diode.
As shown in fig. 2, the voltage detection circuit includes: one end of the resistor R1 is connected with the output end of the first power supply, and the other end of the resistor R1 is connected with the cathode of the diode ZD 1; one end of the resistor R2 is connected with the output end of the second power supply, and the other end of the resistor R2 is connected with the cathode of the diode ZD 2; one end of the resistor R3 is connected with the output end of the first power supply, and the other end of the resistor R3 is connected with the cathode of the diode ZD3; the anode of the diode ZD1 is connected to the anode of the diode ZD2, the diode ZD3, and one pin of the photocoupler U1, respectively. Two pins of the optical coupler U1 are grounded, the three pins of the optical coupler U1 are connected with the anode of the diode ZD4, and the four pins of the optical coupler U1 are connected with the input end of the rectifier SCR. The 12V power supply is respectively connected with one end of a resistor R4, one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R4 is connected with the cathode of a diode ZD4, the other end of the resistor R5 is respectively connected with the input end of a rectifier SCR and four pins of an optical coupler U1, and the other end of the resistor R6 is connected with the anode of a light-emitting diode LED. One pin of the delay switch U2 is connected with the output end of the rectifier SCR and the cathode of the diode D1 respectively, two pins of the delay switch U2 are connected with the cathode of the light emitting diode LED, and the three pins of the delay switch U2, the four pins of the delay switch U2 and the anode of the diode D1 are grounded respectively.
It should be noted that, in the dashed line box of fig. 2, the voltage of each group (without limitation, these groups can be freely increased) on the circuit board is reduced to a proper voltage (close to 0V) by the resistor and the zener diode, and when the voltage on the circuit board is normal, the warning LED will not light up. When any group of voltage is higher than the set voltage, the inside of the optical coupler can be enabled, the transistor inside the optical coupler is turned on to drive the SCR to be turned on immediately, when the internal current of the delay switch exceeds a fixed value, the internal switch can be closed, and the LED can be lightened to provide warning. If the voltage of the circuit board returns to a normal value after a period of time, because the SCR is a semi-controllable component, after the SCR is conducted, the SCR cannot be controlled by the optical coupler any more, and unless 12V on the system is closed, the delay switch can be continuously driven, and the LED can be continuously lightened. By this function, it is possible to prevent the voltage on the circuit board from being abnormal normally. If the LED is lighted, the voltage on the circuit board can be judged to deviate from the set value even if the voltage of each group is measured to be normal, so that the overvoltage warning circuit is started. Wherein the LED can change the buzzer, and the LED can be more easily found by a user as long as the LED is over-voltage.
The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope defined in the present application.
Claims (8)
1. An overvoltage warning device for a circuit board, comprising: the device comprises a voltage reduction module, an optical coupler, a rectifier, a delay switch, an alarm module and a power module;
the voltage reduction module is connected with a plurality of power output ends on the circuit board;
a voltage detection loop is arranged in the device, and the voltage reduction module, the optical coupler, the rectifier, the time delay switch, the alarm module and the power module are connected through the voltage detection loop.
2. The overvoltage alarm device for circuit board according to claim 1, wherein: the voltage detection circuit includes:
the optical coupler is respectively connected with the voltage reduction module, the rectifier and the delay switch, the power supply module is respectively connected with the optical coupler, the rectifier and the alarm module, and the delay switch is respectively connected with the rectifier and the alarm module.
3. The overvoltage alarm device of a circuit board according to claim 2, wherein: the circuit board is provided with three power output ends, the three power output ends comprise a first power output end, a second power output end and a third power output end, and the voltage reduction module is connected with the first power output end, the second power output end and the third power output end respectively.
4. The overvoltage alarm device of a circuit board according to claim 3, wherein: the voltage reduction module comprises a resistor R1, a resistor R2, a resistor R3, a diode ZD1, a diode ZD2 and a diode ZD3;
the voltage detection circuit includes:
one end of the resistor R1 is connected with the output end of the first power supply, and the other end of the resistor R1 is connected with the cathode of the diode ZD 1; one end of the resistor R2 is connected with the output end of the second power supply, and the other end of the resistor R2 is connected with the cathode of the diode ZD 2; one end of the resistor R3 is connected with the output end of the first power supply, and the other end of the resistor R3 is connected with the cathode of the diode ZD3; the anode of the diode ZD1 is connected to the anode of the diode ZD2, the diode ZD3, and the photocoupler, respectively.
5. The circuit board overvoltage alarm device according to claim 4, wherein said voltage detection circuit further comprises:
one pin of the optical coupler U1 is connected with the anode of the diode ZD1, two pins of the optical coupler U1 are grounded, the three pins of the optical coupler U1 are connected with the power supply module, and the four pins of the optical coupler U1 are connected with the rectifier.
6. The overvoltage alarm device of circuit board according to claim 5, wherein the power module comprises a resistor R4, a resistor R5, a resistor R6 and a diode ZD4, and the alarm module is a light emitting diode; the voltage detection circuit further includes:
the 12V power supply is respectively connected with one end of a resistor R4, one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R4 is connected with a cathode of a diode ZD4, an anode of the diode ZD4 is connected with a three-pin of an optocoupler U1, the other end of the resistor R5 is respectively connected with an input end of a rectifier SCR and four pins of the optocoupler U1, and the other end of the resistor R6 is connected with an anode of a light-emitting diode LED.
7. The circuit board overvoltage warning device of claim 6, wherein the voltage detection circuit further comprises:
one pin of the delay switch U2 is connected with the output end of the rectifier SCR and the cathode of the diode D1 respectively, two pins of the delay switch U2 are connected with the cathode of the light emitting diode LED, and the three pins of the delay switch U2, the four pins of the delay switch U2 and the anode of the diode D1 are grounded respectively.
8. The overvoltage alarm device of circuit board according to claim 1, wherein the alarm module is a light emitting diode or a buzzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223608054.5U CN218886017U (en) | 2022-12-31 | 2022-12-31 | Overvoltage alarm device of circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223608054.5U CN218886017U (en) | 2022-12-31 | 2022-12-31 | Overvoltage alarm device of circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218886017U true CN218886017U (en) | 2023-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223608054.5U Active CN218886017U (en) | 2022-12-31 | 2022-12-31 | Overvoltage alarm device of circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218886017U (en) |
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2022
- 2022-12-31 CN CN202223608054.5U patent/CN218886017U/en active Active
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