CN215678606U

CN215678606U - Four-channel liquid leakage detection circuit

Info

Publication number: CN215678606U
Application number: CN202121671789.5U
Authority: CN
Inventors: 黄红日
Original assignee: Suzhou Inspur Intelligent Technology Co Ltd
Current assignee: Suzhou Inspur Intelligent Technology Co Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-01-28
Anticipated expiration: 2031-07-22

Abstract

The utility model relates to a four-channel leakage detection circuit, which comprises a voltage reduction circuit, a voltage comparison circuit and a terminal interface circuit, wherein the voltage reduction circuit comprises a voltage reduction circuit, a voltage comparison circuit and a voltage comparison circuit; the voltage comparison circuit comprises a first voltage comparison circuit, a second voltage comparison circuit, a third voltage comparison circuit and a fourth voltage comparison circuit, and the first voltage comparison circuit, the second voltage comparison circuit, the third voltage comparison circuit and the fourth voltage comparison circuit are all connected with the voltage reduction circuit and the terminal interface circuit; the terminal interface circuit comprises a first interface element and a second interface circuit, the first interface element is connected with the server, and the second interface circuit is connected with the leakage detection rope. According to the utility model, the server collects the level change of the voltage comparison circuit in real time, and analyzes the level change in time to judge the liquid leakage condition, so that the convenience of a detection device bearing the detection circuit can be ensured, the detection process is simple, the intervention of human factors is avoided, the detection is automatically completed, and the detection accuracy is improved.

Description

Four-channel liquid leakage detection circuit

Technical Field

The utility model belongs to the technical field of server safety detection, and particularly relates to a four-channel liquid leakage detection circuit.

Background

At present, the performance requirements of the information field on the server are continuously improved, and one of the factors restricting the improvement of the performance of the server is the heat dissipation problem; the traditional fan has low heat dissipation efficiency and high noise, and is difficult to meet the heat dissipation requirement of a server; along with the development of science and technology, liquid cooling heat dissipation technology is introduced gradually in the technical field of server safety detection, so that the server can dissipate heat more efficiently and reliably, and long-term stable operation of the server is guaranteed. However, the risk of leakage of the cooling liquid exists by using the liquid cooling heat dissipation technology, and the leakage of the cooling liquid can cause error downtime of a server signal if the cooling liquid leaks; even severe leakage can cause servers to short circuit and burn out the servers.

The existing leakage detection method generally judges the leakage condition of the cooling liquid through leakage detection sensors, and has the principle that when the cooling liquid leaks, the resistance value between two leakage detection sensors changes, the interval of the resistance value is too large, the detection sensitivity is poor, false alarm is easy to cause, and each channel needs to be provided with one leakage detection sensor, so that the detection cost is increased, which is the defect of the prior art.

In view of the above, the present invention provides a four-channel liquid leakage detection circuit; it is very necessary to solve the above-mentioned defects existing in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a four-channel liquid leakage detection circuit aiming at the defects of poor detection sensitivity, easy false alarm and high cost of a liquid leakage detection sensor in the prior art so as to solve the problems in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a four-channel leakage detection circuit comprises a voltage reduction circuit, a voltage comparison circuit and a terminal interface circuit;

the voltage comparison circuit comprises a first voltage comparison circuit, a second voltage comparison circuit, a third voltage comparison circuit and a fourth voltage comparison circuit, and the first voltage comparison circuit, the second voltage comparison circuit, the third voltage comparison circuit and the fourth voltage comparison circuit are all connected with the voltage reduction circuit;

the terminal interface circuit comprises a first interface element and a second interface circuit, and the first voltage comparison circuit, the second voltage comparison circuit, the third voltage comparison circuit and the fourth voltage comparison circuit are all connected with the first interface element; the first voltage comparison circuit, the second voltage comparison circuit, the third voltage comparison circuit and the fourth voltage comparison circuit are all connected with the second interface circuit.

Preferably, the voltage reduction circuit comprises a voltage stabilizer U3, a capacitor C9, a capacitor C10 and a capacitor C19; the voltage input end of stabiliser U3 and the first end of condenser C9 all are connected with the 5V power, 3.3V voltage of stabiliser U3's voltage output end output, and the first end of condenser C10 and the first end of condenser C19 all are connected with stabiliser U3's voltage output end, the second end of condenser C9, the second end of condenser C10, the second end of condenser C19 and stabiliser U3's earthing terminal all are grounded, provide 3.3V's comparison voltage for voltage comparison circuit.

Preferably, the voltage regulator U3 is a forward low dropout regulator of model AMS1117, and the voltage regulator U3 of the model incorporates an overheat protection and current limiting circuit therein, can output a voltage of 3.3V with a fixed output, and has an accuracy of 1%.

Preferably, the second interface circuit includes a second interface element P2, an electrostatic impeder D1, an electrostatic impeder D2, an electrostatic impeder D3, and an electrostatic impeder D4; the tenth terminal interface a1 of the second interface element P2 is connected to an input of an electrostatic impedance D1, the eighth terminal interface a2 of the second interface element P2 is connected to an input of an electrostatic impedance D2, the sixth terminal interface A3 of the second interface element P2 is connected to an input of an electrostatic impedance D3, the fourth terminal interface a4 of the second interface element P2 is connected to an input of an electrostatic impedance D4, the ninth terminal interface of the second interface element P2, the seventh terminal interface of the second interface element P2, the fifth terminal interface of the second interface element P2, the third terminal interface of the second interface element P2, the output of the electrostatic impedance D1, the output of the electrostatic impedance D2, the output of the electrostatic impedance D3 and the output of the electrostatic impedance D4 are all grounded, the second interface circuit is integrated on a printed circuit board, and the second interface element P2 is connected to the device for detecting leakage of a test fluid by means of an external plug connection, the leakage condition of the cooling liquid of the collection point of the leakage detection device is detected in real time by utilizing the first test connecting line, the sampling voltage is generated, the first interface element P1 is connected with the server through the externally inserted second test connecting line, and the quick automatic control of the leakage detection is realized through the server.

Preferably, the first voltage comparison circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C15, a capacitor C1, a capacitor C11, a first voltage comparator U1A, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a triode Q1; the first end of the resistor R1, the first end of the resistor R3 and the emitter of the triode Q1 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R1 and the first end of the resistor R2 are both connected with the non-inverting input end of the first voltage comparator U1A, and the second end of the resistor R2 is grounded; the second end of the resistor R3, the first end of the resistor R4, the tenth terminal interface A1 of the second interface element P2, the first end of the capacitor C15 and the first end of the capacitor C1 are all connected with the inverting input end of the first voltage comparator U1A, and the second end of the resistor R4, the second end of the capacitor C15, the second end of the capacitor C1 and the first end of the capacitor C11 are all grounded; the second end of the capacitor C11, the power supply end of the first voltage comparator U1A and the first end of the resistor R5 are all connected with a 5V power supply; the output end of the first voltage comparator U1A, the first end of the capacitor C2 and the second end of the resistor R5 are connected with the first end of the resistor R6; the second end of the resistor R6 and the first end of the resistor R7 are both connected with the base electrode of the triode Q1; the first end of the resistor R8 and the fifth terminal interface DO1 of the first interface element are both connected with the collector of the triode Q1; the ground terminal of the first voltage comparator U1A, the second terminal of the capacitor C2, the second terminal of the resistor R7, and the second terminal of the resistor R8 are all grounded, so that the sampled voltage generated by the second interface circuit is compared with the reference voltage, and the output voltage is generated.

Preferably, the second voltage comparison circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C16, a capacitor C3, a capacitor C12, a second voltage comparator U1B, a capacitor C4, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a triode Q2; the first end of the resistor R9, the first end of the resistor R11 and the emitter of the triode Q2 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R9 and the first end of the resistor R10 are both connected with the non-inverting input end of the second voltage comparator U1B, and the second end of the resistor R10 is grounded; the second end of the resistor R11, the first end of the resistor R12, the eighth terminal interface A2 of the second interface element P2, the first end of the capacitor C16 and the first end of the capacitor C3 are all connected with the inverting input end of the second voltage comparator U1B, and the second end of the resistor R12, the second end of the capacitor C16, the second end of the capacitor C3 and the first end of the capacitor C12 are all grounded; the second end of the capacitor C12, the power supply end of the second voltage comparator U1B and the first end of the resistor R13 are all connected with a 5V power supply; the output end of the second voltage comparator U1B, the first end of the capacitor C4 and the second end of the resistor R13 are connected with the first end of the resistor R14; the second end of the resistor R14 and the first end of the resistor R15 are both connected with the base electrode of the triode Q2; the first end of the resistor R16 and the fourth terminal interface DO2 of the first interface element are both connected with the collector electrode of the triode Q2; the ground terminal of the second voltage comparator U1B, the second terminal of the capacitor C4, the second terminal of the resistor R15, and the second terminal of the resistor R16 are all grounded, so that the sampled voltage generated by the second interface circuit is compared with the reference voltage, and the output voltage is generated.

Preferably, the third voltage comparison circuit comprises a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C17, a capacitor C5, a capacitor C13, a third dual-voltage comparator U2A, a capacitor C6, a resistor R21, a resistor R22, a resistor R23, a resistor R24 and a triode Q3; the first end of the resistor R17, the first end of the resistor R19 and the emitter of the triode Q3 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R17 and the first end of the resistor R18 are both connected with the non-inverting input end of the third dual-voltage comparator U2A, and the second end of the resistor R18 is grounded; the second end of the resistor R19, the first end of the resistor R20, the sixth terminal interface A3 of the second interface element P2, the first end of the capacitor C17 and the first end of the capacitor C5 are all connected with the inverted input end of the third dual-voltage comparator U2A, and the second end of the resistor R20, the second end of the capacitor C17, the second end of the capacitor C5 and the first end of the capacitor C13 are all grounded; the second end of the capacitor C13, the power supply end of the third dual-voltage comparator U2A and the first end of the resistor R21 are all connected with a 5V power supply; the output end of the third dual-voltage comparator U2A, the first end of the capacitor C6 and the second end of the resistor R21 are connected with the first end of the resistor R22; the second end of the resistor R22 and the first end of the resistor R23 are both connected with the base electrode of the triode Q3; the first end of the resistor R24 and the second terminal interface DO3 of the first interface element are both connected with the collector of the triode Q3; the ground terminal of the third dual voltage comparator U2A, the second terminal of the capacitor C6, the second terminal of the resistor R23, and the second terminal of the resistor R24 are all grounded, so that the sampling voltage generated by the second interface circuit is compared with the reference voltage, and the output voltage is generated.

Preferably, the fourth voltage comparison circuit comprises a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C18, a capacitor C7, a capacitor C14, a fourth voltage comparator U2B, a capacitor C8, a resistor R29, a resistor R30, a resistor R31, a resistor R32 and a triode Q4; the first end of the resistor R25, the first end of the resistor R27 and the emitter of the triode Q4 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R25 and the first end of the resistor R26 are both connected with the non-inverting input end of the fourth voltage comparator U2B, and the second end of the resistor R26 is grounded; the second end of the resistor R27, the first end of the resistor R28, the fourth terminal interface a4 of the second interface element P2, the first end of the capacitor C18 and the first end of the capacitor C7 are all connected to the inverting input terminal of the fourth voltage comparator U2B, and the second end of the resistor R28, the second end of the capacitor C18, the second end of the capacitor C7 and the first end of the capacitor C14 are all grounded; the second end of the capacitor C14, the power supply end of the fourth voltage comparator U2B and the first end of the resistor R29 are all connected with a 5V power supply; the output end of the fourth voltage comparator U2B, the first end of the capacitor C8 and the second end of the resistor R29 are connected with the first end of the resistor R30; the second end of the resistor R30 and the first end of the resistor R31 are both connected with the base electrode of the triode Q4; the first end of the resistor R32 and the first terminal interface DO4 of the first interface element are both connected with the collector of the triode Q4; the ground terminal of the fourth voltage comparator U2B, the second terminal of the capacitor C8, the second terminal of the resistor R31, and the second terminal of the resistor R32 are all grounded, so that the sampled voltage generated by the second interface circuit is compared with the reference voltage, and the output voltage is generated.

The utility model has the advantages that the server acquires the level change of the voltage comparison circuit in real time, analyzes the level change in time and judges the liquid leakage condition, the sensitivity is higher, the convenience of the detection device bearing the detection circuit can be ensured, the detection process is simple, the intervention of artificial factors is avoided, the detection is automatically completed, and the detection accuracy is improved.

In addition, the utility model has reliable design principle and very wide application prospect.

Therefore, compared with the prior art, the utility model has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.

Drawings

Fig. 1 is a schematic diagram of the operation of the detection circuit.

Reference numeral 1 denotes a step-down circuit, 2 denotes a terminal interface circuit, the first interface devices P1, 21 denote second interface circuits, 3 denotes a voltage comparison circuit, 31 denotes a first voltage comparison circuit, 32 denotes a second voltage comparison circuit, 33 denotes a third voltage comparison circuit, and 34 denotes a fourth voltage comparison circuit.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.

As shown in fig. 1, the present invention provides a four-channel liquid leakage detection circuit, which includes a voltage reduction circuit 1, a voltage comparison circuit 3, and a terminal interface circuit 2.

The voltage reduction circuit 1 comprises a voltage stabilizer U3, a capacitor C9, a capacitor C10 and a capacitor C19; the voltage stabilizer U3 adopts a forward low-voltage drop voltage stabilizer with the model of AMS1117, and an overheat protection and current limiting circuit is integrated in the voltage stabilizer U3, so that 3.3V voltage can be fixedly output, and the precision is 1%; the voltage input end of stabiliser U3 and the first end of condenser C9 all are connected with the 5V power, 3.3V voltage of stabiliser U3's voltage output end output, and the first end of condenser C10 and the first end of condenser C19 all are connected with stabiliser U3's voltage output end, the second end of condenser C9, the second end of condenser C10, the second end of condenser C19 and stabiliser U3's earthing terminal all are grounded, provide 3.3V's comparison voltage for voltage comparison circuit 3.

The terminal interface circuit 2 comprises a first interface element P1 and a second interface circuit 21, the second interface circuit 21 comprising a second interface element P2, an electrostatic impeder D1, an electrostatic impeder D2, an electrostatic impeder D3, and an electrostatic impeder D4; the tenth terminal interface a1 of the second interface element P2 is connected to an input of an electrostatic impedance D1, the eighth terminal interface a2 of the second interface element P2 is connected to an input of an electrostatic impedance D2, the sixth terminal interface A3 of the second interface element P2 is connected to an input of an electrostatic impedance D3, the fourth terminal interface a4 of the second interface element P2 is connected to an input of an electrostatic impedance D4, the ninth terminal interface of the second interface element P2, the seventh terminal interface of the second interface element P2, the fifth terminal interface of the second interface element P2, the third terminal interface of the second interface element P2, the output of the electrostatic impedance D1, the output of the electrostatic impedance D2, the output of the electrostatic impedance D3 and the output of the electrostatic impedance D4 are all grounded, the second interface circuit 21 is integrated on the printed circuit board, and the second interface element P2 is connected to the device for testing leakage of the external test fluid, the leakage detection device is installed in the server, the leakage condition of the cooling liquid at the collection point of the leakage detection device is detected in real time by using the first test connecting line, the sampling voltage is generated, the first interface element P1 is connected with the server through the second test connecting line in an externally inserted mode, and the leakage detection is rapidly and automatically controlled through the server.

The voltage comparison circuit 3 comprises a first voltage comparison circuit 31, a second voltage comparison circuit 32, a third voltage comparison circuit 33 and a fourth voltage comparison circuit 34, and the first voltage comparison circuit 31, the second voltage comparison circuit 32, the third voltage comparison circuit 33 and the fourth voltage comparison circuit 34 are all connected with the voltage reduction circuit 1; the first voltage comparison circuit 31, the second voltage comparison circuit 32, the third voltage comparison circuit 33 and the fourth voltage comparison circuit 34 are all connected with the first interface element P1; the first voltage comparison circuit 31, the second voltage comparison circuit 32, the third voltage comparison circuit 33, and the fourth voltage comparison circuit 34 are all connected to the second interface circuit 21.

The first voltage comparison circuit 31 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C15, a capacitor C1, a capacitor C11, a first voltage comparator U1A, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a triode Q1; the first end of the resistor R1, the first end of the resistor R3 and the emitter of the triode Q1 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R1 and the first end of the resistor R2 are both connected with the non-inverting input end of the first voltage comparator U1A, and the second end of the resistor R2 is grounded; the second end of the resistor R3, the first end of the resistor R4, the tenth terminal interface A1 of the second interface element P2, the first end of the capacitor C15 and the first end of the capacitor C1 are all connected with the inverting input end of the first voltage comparator U1A, and the second end of the resistor R4, the second end of the capacitor C15, the second end of the capacitor C1 and the first end of the capacitor C11 are all grounded; the second end of the capacitor C11, the power supply end of the first voltage comparator U1A and the first end of the resistor R5 are all connected with a 5V power supply; the output end of the first voltage comparator U1A, the first end of the capacitor C2 and the second end of the resistor R5 are connected with the first end of the resistor R6; the second end of the resistor R6 and the first end of the resistor R7 are both connected with the base electrode of the triode Q1; the first end of the resistor R8 and the fifth terminal interface DO1 of the first interface element P1 are both connected to the collector of the transistor Q1; the grounding end of the first voltage comparator U1A, the second end of the capacitor C2, the second end of the resistor R7 and the second end of the resistor R8 are all grounded; the voltage output end of the voltage stabilizer U3 outputs 3.3V voltage to provide 3.3V comparison voltage for the first voltage comparison circuit 31, the 3.3V comparison voltage forms reference voltage through the effect of the resistor R1 and the resistor R2, so that the sampling voltage generated by the second interface circuit 21 is compared with the reference voltage conveniently to generate output voltage, and the server collects the output voltage generated by the first voltage comparison circuit 31 through the first interface element P1 and judges the leakage condition of the cooling liquid according to the voltage change.

The second voltage comparison circuit 32 comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C16, a capacitor C3, a capacitor C12, a second voltage comparator U1B, a capacitor C4, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a triode Q2; the first end of the resistor R9, the first end of the resistor R11 and the emitter of the triode Q2 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R9 and the first end of the resistor R10 are both connected with the non-inverting input end of the second voltage comparator U1B, and the second end of the resistor R10 is grounded; the second end of the resistor R11, the first end of the resistor R12, the eighth terminal interface A2 of the second interface element P2, the first end of the capacitor C16 and the first end of the capacitor C3 are all connected with the inverting input end of the second voltage comparator U1B, and the second end of the resistor R12, the second end of the capacitor C16, the second end of the capacitor C3 and the first end of the capacitor C12 are all grounded; the second end of the capacitor C12, the power supply end of the second voltage comparator U1B and the first end of the resistor R13 are all connected with a 5V power supply; the output end of the second voltage comparator U1B, the first end of the capacitor C4 and the second end of the resistor R13 are connected with the first end of the resistor R14; the second end of the resistor R14 and the first end of the resistor R15 are both connected with the base electrode of the triode Q2; the first end of the resistor R16 and the fourth terminal interface DO2 of the first interface element P1 are both connected with the collector of the triode Q2; the ground terminal of the second voltage comparator U1B, the second terminal of the capacitor C4, the second terminal of the resistor R15 and the second terminal of the resistor R16 are all grounded; the voltage output end of the voltage stabilizer U3 outputs 3.3V voltage to provide 3.3V comparison voltage for the second voltage comparison circuit 32, the 3.3V comparison voltage forms reference voltage through the effect of the resistor R9 and the resistor R10, so that the sampling voltage generated by the second interface circuit 21 is compared with the reference voltage conveniently to generate output voltage, and the server collects the output voltage generated by the second voltage comparison circuit 32 through the first interface element P1 and judges the leakage condition of the cooling liquid according to the voltage change.

First voltage comparator U1A and second voltage comparator U1B are integrated in a dual voltage comparator, this uses novel dual voltage comparator that adopts the model to be LM393, the power end of first voltage comparator U1A and the power end of second voltage comparator U1B are same power end, the earthing terminal of first voltage comparator U1A and the earthing terminal of second voltage comparator U1B are same earthing terminal, the dual voltage comparator sensitivity of this model is higher, and can satisfy the required precision to level and voltage acquisition.

The third voltage comparison circuit 33 comprises a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C17, a capacitor C5, a capacitor C13, a third dual-voltage comparator U2A, a capacitor C6, a resistor R21, a resistor R22, a resistor R23, a resistor R24 and a triode Q3; the first end of the resistor R17, the first end of the resistor R19 and the emitter of the triode Q3 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R17 and the first end of the resistor R18 are both connected with the non-inverting input end of the third dual-voltage comparator U2A, and the second end of the resistor R18 is grounded; the second end of the resistor R19, the first end of the resistor R20, the sixth terminal interface A3 of the second interface element P2, the first end of the capacitor C17 and the first end of the capacitor C5 are all connected with the inverted input end of the third dual-voltage comparator U2A, and the second end of the resistor R20, the second end of the capacitor C17, the second end of the capacitor C5 and the first end of the capacitor C13 are all grounded; the second end of the capacitor C13, the power supply end of the third dual-voltage comparator U2A and the first end of the resistor R21 are all connected with a 5V power supply; the output end of the third dual-voltage comparator U2A, the first end of the capacitor C6 and the second end of the resistor R21 are connected with the first end of the resistor R22; the second end of the resistor R22 and the first end of the resistor R23 are both connected with the base electrode of the triode Q3; a first end of the resistor R24 and a second terminal interface DO3 of the first interface element P1 are both connected with a collector of the triode Q3; the ground terminal of the third dual-voltage comparator U2A, the second terminal of the capacitor C6, the second terminal of the resistor R23 and the second terminal of the resistor R24 are all grounded; the voltage output end of the voltage stabilizer U3 outputs 3.3V voltage to provide 3.3V comparison voltage for the third voltage comparison circuit 33, the 3.3V comparison voltage forms reference voltage through the action of the resistor R17 and the resistor R18, so that the sampling voltage generated by the second interface circuit 21 is compared with the reference voltage conveniently to generate output voltage, and the server collects the output voltage generated by the third voltage comparison circuit 33 through the first interface element P1 and judges the leakage condition of the cooling liquid according to the voltage change.

The fourth voltage comparison circuit 34 comprises a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C18, a capacitor C7, a capacitor C14, a fourth voltage comparator U2B, a capacitor C8, a resistor R29, a resistor R30, a resistor R31, a resistor R32 and a triode Q4; the first end of the resistor R25, the first end of the resistor R27 and the emitter of the triode Q4 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R25 and the first end of the resistor R26 are both connected with the non-inverting input end of the fourth voltage comparator U2B, and the second end of the resistor R26 is grounded; the second end of the resistor R27, the first end of the resistor R28, the fourth terminal interface a4 of the second interface element P2, the first end of the capacitor C18 and the first end of the capacitor C7 are all connected to the inverting input terminal of the fourth voltage comparator U2B, and the second end of the resistor R28, the second end of the capacitor C18, the second end of the capacitor C7 and the first end of the capacitor C14 are all grounded; the second end of the capacitor C14, the power supply end of the fourth voltage comparator U2B and the first end of the resistor R29 are all connected with a 5V power supply; the output end of the fourth voltage comparator U2B, the first end of the capacitor C8 and the second end of the resistor R29 are connected with the first end of the resistor R30; the second end of the resistor R30 and the first end of the resistor R31 are both connected with the base electrode of the triode Q4; a first end of the resistor R32 and a first terminal interface DO4 of the first interface element P1 are both connected to a collector of the transistor Q4; the ground terminal of the fourth voltage comparator U2B, the second terminal of the capacitor C8, the second terminal of the resistor R31 and the second terminal of the resistor R32 are all grounded; the voltage output end of the voltage stabilizer U3 outputs 3.3V voltage to provide 3.3V comparison voltage for the fourth voltage comparison circuit 34, the 3.3V comparison voltage forms reference voltage through the effect of the resistor R25 and the resistor R26, so that the sampling voltage generated by the second interface circuit 21 is compared with the reference voltage conveniently to generate output voltage, and the server collects the output voltage generated by the fourth voltage comparison circuit 34 through the first interface element P1 and judges the leakage condition of the cooling liquid according to the voltage change.

Third voltage comparator U2A and fourth voltage comparator U2B are integrated in a dual voltage comparator, this use is novel to adopt the dual voltage comparator that the model is LM393, the power end of third voltage comparator U2A and the power end of fourth voltage comparator U2B are same power end, the earthing terminal of third voltage comparator U2A and the earthing terminal of fourth voltage comparator U2B are same earthing terminal, the dual voltage comparator sensitivity of this model is higher, and can satisfy the required precision to level and voltage acquisition.

The detection device has the advantages that the server collects the level change of the collection point of the voltage comparison circuit in real time, and analyzes the level change of the collection point in time to judge the liquid leakage condition, so that the detection device bearing the detection circuit is convenient, the detection process is simple, the intervention of human factors is avoided, the detection is automatically completed, and the detection accuracy is improved. The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A four-channel leakage detection circuit is characterized by comprising a voltage reduction circuit, a voltage comparison circuit and a terminal interface circuit;

2. The four-channel leakage detection circuit of claim 1, wherein the voltage reduction circuit comprises a voltage regulator U3, a capacitor C9, a capacitor C10 and a capacitor C19;

the voltage input end of voltage stabilizer U3 and the first end of electric capacity C9 all are connected with the 5V power, and 3.3V voltage is exported to the voltage output end of voltage stabilizer U3, and the first end of electric capacity C10 and the first end of electric capacity C19 all are connected with the voltage output end of voltage stabilizer U3, and the second end of electric capacity C9, the second end of electric capacity C10, the second end of electric capacity C19 and the earthing terminal of voltage stabilizer U3 all ground.

3. The four-channel leakage detection circuit of claim 2, wherein said regulator U3 is an AMS1117 forward low dropout regulator.

4. The four-channel leakage detection circuit of claim 1, wherein said second interface circuit comprises a second interface element P2, an electrostatic resistor D1, an electrostatic resistor D2, an electrostatic resistor D3, and an electrostatic resistor D4;

the tenth terminal interface a1 of the second interface element P2 is connected to the input of the electrostatic impedance D1, the eighth terminal interface a2 of the second interface element P2 is connected to the input of the electrostatic impedance D2, the sixth terminal interface A3 of the second interface element P2 is connected to the input of the electrostatic impedance D3, the fourth terminal interface a4 of the second interface element P2 is connected to the input of the electrostatic impedance D4, the ninth terminal interface of the second interface element P2, the seventh terminal interface of the second interface element P2, the fifth terminal interface of the second interface element P2, the third terminal interface of the second interface element P2, the output of the electrostatic impedance D1, the output of the electrostatic impedance D2, the output of the electrostatic impedance D3 and the output of the electrostatic impedance D4 are all grounded.

5. The four-channel leakage detection circuit of claim 1, wherein the first voltage comparison circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C15, a capacitor C1, a capacitor C11, a first voltage comparator U1A, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a transistor Q1;

the first end of the resistor R1, the first end of the resistor R3 and the emitter of the triode Q1 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R1 and the first end of the resistor R2 are both connected with the non-inverting input end of the first voltage comparator U1A, and the second end of the resistor R2 is grounded; the second end of the resistor R3, the first end of the resistor R4, the tenth terminal interface A1 of the second interface element P2, the first end of the capacitor C15 and the first end of the capacitor C1 are all connected with the inverting input end of the first voltage comparator U1A, and the second end of the resistor R4, the second end of the capacitor C15, the second end of the capacitor C1 and the first end of the capacitor C11 are all grounded; the second end of the capacitor C11, the power supply end of the first voltage comparator U1A and the first end of the resistor R5 are all connected with a 5V power supply; the output end of the first voltage comparator U1A, the first end of the capacitor C2 and the second end of the resistor R5 are connected with the first end of the resistor R6; the second end of the resistor R6 and the first end of the resistor R7 are both connected with the base electrode of the triode Q1; the first end of the resistor R8 and the fifth terminal interface DO1 of the first interface element are both connected with the collector of the triode Q1; the ground terminal of the first voltage comparator U1A, the second terminal of the capacitor C2, the second terminal of the resistor R7, and the second terminal of the resistor R8 are all grounded.

6. The four-channel leakage detection circuit of claim 1, wherein the second voltage comparison circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C16, a capacitor C3, a capacitor C12, a second voltage comparator U1B, a capacitor C4, a resistor R13, a resistor R14, a resistor R15, a resistor R16, and a transistor Q2;

the first end of the resistor R9, the first end of the resistor R11 and the emitter of the triode Q2 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R9 and the first end of the resistor R10 are both connected with the non-inverting input end of the second voltage comparator U1B, and the second end of the resistor R10 is grounded; the second end of the resistor R11, the first end of the resistor R12, the eighth terminal interface A2 of the second interface element P2, the first end of the capacitor C16 and the first end of the capacitor C3 are all connected with the inverting input end of the second voltage comparator U1B, and the second end of the resistor R12, the second end of the capacitor C16, the second end of the capacitor C3 and the first end of the capacitor C12 are all grounded; the second end of the capacitor C12, the power supply end of the second voltage comparator U1B and the first end of the resistor R13 are all connected with a 5V power supply; the output end of the second voltage comparator U1B, the first end of the capacitor C4 and the second end of the resistor R13 are connected with the first end of the resistor R14; the second end of the resistor R14 and the first end of the resistor R15 are both connected with the base electrode of the triode Q2; the first end of the resistor R16 and the fourth terminal interface DO2 of the first interface element are both connected with the collector electrode of the triode Q2; the ground terminal of the second voltage comparator U1B, the second terminal of the capacitor C4, the second terminal of the resistor R15, and the second terminal of the resistor R16 are all grounded.

7. The four-channel leakage detection circuit of claim 1, wherein the third voltage comparison circuit comprises a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C17, a capacitor C5, a capacitor C13, a third dual-voltage comparator U2A, a capacitor C6, a resistor R21, a resistor R22, a resistor R23, a resistor R24, and a transistor Q3;

the first end of the resistor R17, the first end of the resistor R19 and the emitter of the triode Q3 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R17 and the first end of the resistor R18 are both connected with the non-inverting input end of the third dual-voltage comparator U2A, and the second end of the resistor R18 is grounded; the second end of the resistor R19, the first end of the resistor R20, the sixth terminal interface A3 of the second interface element P2, the first end of the capacitor C17 and the first end of the capacitor C5 are all connected with the inverted input end of the third dual-voltage comparator U2A, and the second end of the resistor R20, the second end of the capacitor C17, the second end of the capacitor C5 and the first end of the capacitor C13 are all grounded; the second end of the capacitor C13, the power supply end of the third dual-voltage comparator U2A and the first end of the resistor R21 are all connected with a 5V power supply; the output end of the third dual-voltage comparator U2A, the first end of the capacitor C6 and the second end of the resistor R21 are connected with the first end of the resistor R22; the second end of the resistor R22 and the first end of the resistor R23 are both connected with the base electrode of the triode Q3; the first end of the resistor R24 and the second terminal interface DO3 of the first interface element are both connected with the collector of the triode Q3; the ground terminal of the third dual voltage comparator U2A, the second terminal of the capacitor C6, the second terminal of the resistor R23, and the second terminal of the resistor R24 are all grounded.

8. The four-channel leakage detection circuit of claim 1, wherein the fourth voltage comparison circuit comprises a resistor R25, a resistor R26, a resistor R27, a resistor R28, a capacitor C18, a capacitor C7, a capacitor C14, a fourth voltage comparator U2B, a capacitor C8, a resistor R29, a resistor R30, a resistor R31, a resistor R32, and a transistor Q4;

the first end of the resistor R25, the first end of the resistor R27 and the emitter of the triode Q4 are connected with the voltage output end of the voltage stabilizer U3; the second end of the resistor R25 and the first end of the resistor R26 are both connected with the non-inverting input end of the fourth voltage comparator U2B, and the second end of the resistor R26 is grounded; the second end of the resistor R27, the first end of the resistor R28, the fourth terminal interface a4 of the second interface element P2, the first end of the capacitor C18 and the first end of the capacitor C7 are all connected to the inverting input terminal of the fourth voltage comparator U2B, and the second end of the resistor R28, the second end of the capacitor C18, the second end of the capacitor C7 and the first end of the capacitor C14 are all grounded; the second end of the capacitor C14, the power supply end of the fourth voltage comparator U2B and the first end of the resistor R29 are all connected with a 5V power supply; the output end of the fourth voltage comparator U2B, the first end of the capacitor C8 and the second end of the resistor R29 are connected with the first end of the resistor R30; the second end of the resistor R30 and the first end of the resistor R31 are both connected with the base electrode of the triode Q4; the first end of the resistor R32 and the first terminal interface DO4 of the first interface element are both connected with the collector of the triode Q4; the ground terminal of the fourth voltage comparator U2B, the second terminal of the capacitor C8, the second terminal of the resistor R31, and the second terminal of the resistor R32 are all grounded.