Corrosion detection circuit, PCB and power supply equipment

Abstract

The invention discloses a corrosion detection circuit, a PCB and power supply equipment. The corrosion detection circuit is applied to a PCB and comprises a first divider resistor, a voltage output port and a plurality of detection resistors. The detection resistors are connected in parallel, a corrosion sensing area is arranged on a branch corresponding to each detection resistor, and the corrosion sensing areas are used for breaking lines when an electric connection path of the PCB is corroded; the first parallel connection end of each detection resistor is connected with the first end of the first divider resistor; one of the second parallel connection end of each detection resistor and the second end of the first divider resistor is used for connecting a power supply, and the other is used for grounding; the voltage output port is connected with the first end of the first divider resistor; the voltage output port is used for outputting a sensing value. According to the invention, the corrosion condition of the PCB can be accurately obtained, and the accuracy of corrosion detection is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a corrosion detection circuit, a PCB and a power supply device. Background Art

[0002] When uninterruptible power supplies and converters are operated in a humid, gas-polluted, dusty environment, the moisture in the environment will condense into water droplets or form a liquid film on the printed circuit board (PCB) inside the equipment. At the same time, the air intake and exhaust process of the equipment will also bring pollutants and dust into the equipment, causing them to accumulate on the PCB. Under the action of moisture, pollutants and dust, the PCB will corrode, interfere with the normal operation of the circuit, and then cause equipment failure. Summary of the invention

[0003] The embodiment of the present invention provides a corrosion detection circuit, a PCB and a power supply device to accurately obtain the corrosion condition of the PCB board and improve the accuracy of corrosion detection.

[0004] A first aspect of an embodiment of the present invention provides a corrosion detection circuit, which is applied to a PCB. The corrosion detection circuit includes a first voltage-dividing impedance unit, a voltage output port, and a plurality of detection impedance units;

[0005] Each detection impedance unit is connected in parallel, and a corrosion sensing area is provided on a branch corresponding to each detection impedance unit, and the corrosion sensing area is used to disconnect the electrical connection path of the PCB when it is corroded;

[0006] The first parallel terminal of each detection impedance unit is connected to the first terminal of the first voltage dividing impedance unit;

[0007] One of the second parallel-connected ends of each detection impedance unit and the second end of the first voltage-dividing impedance unit is used to connect to a power supply, and the other is used to ground;

[0008] The voltage output port is connected to the first end of the first voltage-dividing impedance unit; wherein the voltage output port is used to output the sensing value.

[0009] In one embodiment, the corrosion sensing area corresponding to each detection impedance unit has a different corrosion threshold at which disconnection occurs when corroded.

[0010] In one embodiment, the wire diameters of the connection wires of the corrosion sensing areas corresponding to each detection impedance unit are different.

[0011] In one embodiment, the corrosion sensing areas corresponding to each detection impedance unit are centrally placed, and the impedance value of each detection impedance unit is the same.

[0012] In one embodiment, the corrosion detection circuit further comprises at least one detection wire;

[0013] The first end of the detection wire is connected to the first parallel connection end, and the second end of the detection wire is close to the second parallel connection end and is suspended;

[0014] Alternatively, the first end of the detection wire is connected to the second parallel end, and the second end of the detection wire is close to the first parallel end and suspended.

[0015] In one embodiment, the corrosion detection circuit further includes a second voltage-dividing impedance unit;

[0016] The second parallel terminal is connected to a power supply or ground through the second voltage-dividing impedance unit.

[0017] In one embodiment, the corrosion detection circuit further includes a capacitor;

[0018] The capacitor is connected between the first parallel terminal and the second parallel terminal.

[0019] A second aspect of the embodiments of the present invention provides a PCB, comprising the corrosion detection circuit as described in the first aspect or any embodiment of the first aspect.

[0020] A third aspect of an embodiment of the present invention provides a power supply device including a heat dissipation channel and the PCB as described in the second aspect above;

[0021] The corrosion detection circuit of the PCB is located in the heat dissipation channel, and the distance between the corrosion detection circuit and the air inlet of the heat dissipation channel is greater than a preset length.

[0022] In one embodiment, the power supply device further comprises a display device;

[0023] The display device is used to display the corrosion result corresponding to the sensing value output by the corrosion detection circuit.

[0024] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0025] By connecting multiple detection impedance units in parallel and then connecting them in series with the first voltage-dividing impedance unit in the corrosion detection circuit, and setting a corrosion sensing area on the parallel branch of each detection circuit, corrosion detection can be achieved by utilizing the corrosion conditions of each corrosion sensing area; wherein, when the corrosion sensing area is corroded, the corresponding detection impedance unit is open-circuited in the corrosion detection circuit, the impedance value of all the detection impedance units connected in parallel in the corrosion detection circuit will change, and the voltage value output by the voltage output port will also change accordingly, thereby being able to accurately obtain the specific situation of corrosion of the circuit board and improve the accuracy of corrosion detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 is a first circuit structure diagram of a corrosion detection circuit provided in an embodiment of the present application;

[0028] Figure 2 is a second circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0029] Figure 3 is a first schematic diagram of a corrosion detection circuit provided in an embodiment of the present application detecting wet dust corrosion;

[0030] Figure 4 is an equivalent circuit diagram of the corrosion detection circuit provided in the embodiment of the present application for detecting wet dust corrosion;

[0031] Figure 5 is a third circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0032] Figure 6 is a fourth circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0033] Figure 7 is a fifth circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0034] Figure 8 is a second schematic diagram of the corrosion detection circuit provided in the embodiment of the present application detecting wet dust corrosion;

[0035] Fig. 9 is a sixth circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0036] Fig.10 is a seventh circuit structure diagram of the corrosion detection circuit provided in an embodiment of the present application;

[0037] Fig.11 This is the third schematic diagram of the corrosion detection circuit provided in the embodiment of the present application detecting wet dust corrosion. DETAILED DESCRIPTION

[0038] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0039] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0040] The inventors have found that in order to perform corrosion detection on a PCB board, a high level or a low level output by a corrosion detection circuit is usually used for judgment. However, this method can only simply judge whether the PCB board is corroded, and cannot accurately obtain the specific situation of the corrosion of the PCB board.

[0041] Based on the idea of ​​accurately detecting the corrosion condition on the circuit board, in the implementation mode of the present application, multiple detection impedance units are connected in parallel and then in series with the first voltage-dividing impedance unit, and a corrosion sensing area is set on the parallel branch of each detection circuit. When the corrosion sensing area is corroded, the equivalent impedance values ​​corresponding to all detection impedance units will change, which can cause the sensing value output by the voltage output port to change accordingly, and then the corrosion condition on the PCB board can be accurately obtained through the change of the sensing value.

[0042] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0043] See also Figure 1 and Figure 2 The present invention provides a corrosion detection circuit, which is applied to PCB. The corrosion detection circuit includes a first voltage-dividing resistor Rf1, a voltage output port OUT, and a plurality of detection resistors Ri. The value of i can be 1, 2, 3...n, and n is a positive integer.

[0044] Each detection resistor Ri is connected in parallel, and a solder resist layer opening Bi is provided on the branch corresponding to each detection resistor Ri. The value of i is also 1, 2, 3...n, and the solder resist layer opening corresponds to the corresponding detection resistor, that is, the detection resistor R1 corresponds to the solder resist layer opening B1, and the detection resistor R2 corresponds to the solder resist layer opening B2.

[0045] In order to ensure insulation and protect the PCB from external short circuits and environmental influences, a solder mask is provided on the surface of the PCB board. The solder mask is a PCB oil layer that covers the copper wire and the PCB material. In this embodiment, a corrosion sensing area is set by opening (opening a window) in the solder mask, which is used to disconnect the electrical connection path of the PCB when it is corroded. Here, the solder mask opening refers to opening a window on the PCB electrical connection path in a preset area on the branch corresponding to the detection resistor Ri, that is, no coating protection is performed, so that the electrical connection path at this location is exposed, creating a weak point. The area where the solder mask opening is opened is more susceptible to corrosion. When the solder mask opening is corroded, an open circuit will be formed at the corresponding detection resistor, thereby changing the resistance value of the equivalent resistance of the detection resistor in the access circuit, thereby realizing corrosion detection of the PCB board.

[0046] In other circuit boards, if exposed wires are used for connection, the corrosion weak area can be created by providing openings in the insulation layer of the exposed wires.

[0047] The first parallel end of each detection resistor Ri is connected to the first end of the first voltage-dividing resistor Rf1; the second parallel end of each detection resistor Ri and one of the second ends of the first voltage-dividing resistor Rf1 are used to connect to the power supply VCC, and the other is used to connect to the ground GND.

[0048] When the second end of the first voltage-dividing resistor Rf1 is connected to the power supply VCC, the first voltage-dividing resistor Rf1 serves as a pull-up resistor. Figure 1 When the second end of the first voltage-dividing resistor Rf1 is grounded to GND, the first voltage-dividing resistor Rf1 acts as a pull-down resistor. Figure 2 shown.

[0049] The voltage output port OUT is connected to the first end of the first voltage-dividing resistor Rf1 ; wherein the voltage output port OUT is used to output the sensed value.

[0050] Here, the voltage output port OUT can output a corresponding sensing value according to the detected corrosion situation. The sensing value is generally a voltage value corresponding to the above-mentioned equivalent resistance.

[0051] by Figure 1 For example, the more serious the corrosion of the PCB board is, the more detection circuits cannot be connected to the circuit, the larger the resistance of the equivalent resistor connected to the circuit, the larger the corresponding resistance voltage divider is, and the higher the sensing value will be.

[0052] The embodiment of the present invention connects multiple detection resistors in parallel and then in series with a first voltage-dividing resistor in a corrosion detection circuit, and sets a solder resist opening in the parallel branch of each detection circuit, so that corrosion detection can be achieved by utilizing the corrosion conditions of each solder resist opening; wherein, when the solder resist opening is corroded, the corresponding detection resistor is open-circuited in the corrosion detection circuit, the resistance value of all the detection resistors connected in parallel in the corrosion detection circuit will change, and the voltage value output by the voltage output port will also change accordingly, thereby being able to accurately obtain the specific situation of corrosion of the circuit board and improve the accuracy of corrosion detection.

[0053] The dust in the environment may contain soluble salts such as chlorides, sulfates and nitrates. When the humidity increases, the water will form an adsorption liquid film on the surface of the PCB board, and these salts will also dissolve in it to form a conductive electrolyte solution, which will cause corrosion to the circuit board and form a corrosion equivalent resistance, namely wet dust corrosion.

[0054] When the above-mentioned corrosion equivalent resistance is small, the resistance value of the corrosion equivalent resistance can be ignored, that is, the wet dust is equivalent to a wire, which may cause a short circuit in the circuit.

[0055] Optional, see Figure 3 and Figure 4 , the detection resistors Ri can be placed together, and the detection resistors Ri may be connected due to wet dust, causing the detection resistors Ri to be short-circuited, or a corrosion equivalent resistor can be connected in the circuit (when the resistance of the corrosion equivalent resistor is large, the wet dust cannot be ignored).

[0056] like Figure 3 , wet dust corrosion occurs between the detection resistor R1 and the detection resistor R2, that is, a corrosion equivalent resistor Rx is connected between the first parallel terminal and the second parallel terminal. The corresponding equivalent circuit diagram can be seen in Figure 4 When the corrosion equivalent resistance Rx is negligible, a short circuit occurs, causing the sensed value outputted from the voltage output port OUT to change.

[0057] When the corrosion equivalent resistance cannot be ignored, it is equivalent to adding another resistor in parallel to the detection resistor Ri, which causes the resistance value of all parallel resistors to change. The sensed value output by the voltage output port OUT will also change accordingly.

[0058] In some embodiments, the solder resist layer opening Bi corresponding to each detection resistor Ri has a different corrosion threshold at which disconnection occurs when corroded.

[0059] In this embodiment, in order to further accurately detect the corrosion degree on the PCB board, a different corrosion threshold value may be set for each solder resist layer opening Bi.

[0060] Here, a low corrosion threshold means that the circuit will be opened by corrosion when the corrosion degree is relatively light; a high corrosion threshold means that the circuit will be opened by corrosion only when the corrosion degree is relatively severe.

[0061] When corrosion occurs on the PCB (for example, the degree of corrosion is A), due to the different corrosion thresholds corresponding to the solder mask openings Bi, the corrosion on the PCB will cause the solder mask openings Bi with a corrosion threshold less than A to be corroded and disconnected, and an open circuit will be formed at the corresponding detection resistor, thereby changing the corresponding equivalent resistance, and the sensing value output by the voltage output port OUT will also change accordingly, so that the degree of corrosion on the PCB can be accurately obtained through the sensing value.

[0062] Optionally, the corrosion threshold corresponding to the solder resist opening Bi of each detection resistor Ri is different. The wire diameters of the connecting wires at the solder resist opening Bi corresponding to each detection resistor Ri may be different, the materials of the connecting wires at the solder resist opening Bi corresponding to each detection resistor Ri may be different, or the degree of solder resist removal at the solder resist opening Bi corresponding to each detection resistor Ri may be different.

[0063] Furthermore, the solder resist layer openings Bi corresponding to each detection resistor Ri are placed centrally, and the resistance value of each detection resistor Ri is the same.

[0064] In this embodiment, by setting each detection resistor Ri to the same resistance value, it is possible to quickly and accurately determine how many detection resistors Ri are not connected to the circuit, thereby determining how many solder mask openings Bi are open, and then quickly and accurately judge the corrosion condition at that location on the circuit board.

[0065] When only one solder mask opening Bi is corroded and opened, the corrosion degree of this position on the PCB is relatively light, which can be determined as light corrosion. When multiple solder mask openings Bi are corroded and opened, the corrosion degree deepens, which can be determined as heavy corrosion. When a large number of solder mask openings Bi are corroded and opened, serious corrosion occurs on the PCB, which can be determined as heavy corrosion.

[0066] In other embodiments, the solder mask opening Bi corresponding to each detection resistor Ri can be dispersed at different positions on the PCB board, and each detection resistor Ri has a different resistance value, so that the corrosion conditions at different positions on the PCB board can be detected to obtain the range of corrosion on the PCB board.

[0067] Here, by accurately selecting the resistance value of each detection resistor Ri, it is possible to accurately determine the detection resistor Ri that is connected or not connected to the circuit when the equivalent resistance value of each detection resistor Ri is different, thereby determining where the corrosion open circuit occurs on the PCB board and obtaining the range of corrosion on the PCB board.

[0068] In some embodiments, Figure 5 As shown, the corrosion detection circuit further includes a capacitor C1; the capacitor C1 is connected between the first parallel terminal and the second parallel terminal.

[0069] In this embodiment, the capacitor C1 can be used to achieve anti-jitter and filtering functions to ensure the stability of the output sensing value.

[0070] Here, a reference output port OUT' may also be set, and the corrosion condition on the PCB board may be obtained through the voltage output port OUT and the reference output port OUT'.

[0071] In some specific embodiments, Figure 6 As shown, taking the setting of three detection resistors as an example for explanation, wherein the second end of the first voltage-dividing resistor Rf1 is connected to the power supply VCC, the resistance of the first voltage-dividing resistor Rf1 is 3KΩ, the resistance of the detection resistor R1, the detection resistor R2 and the detection resistor R3 are all 5.1KΩ, and the voltage of the power supply VCC is 3.3V.

[0072] When the three solder mask openings B1, B2 and B3 are not disconnected, the detection resistors R1, R2 and R3 are connected in parallel, 3.3V is divided to ground, and the sensed value outputted by the voltage output port OUT is 1.19V.

[0073] When one of the three solder resist openings is disconnected and the other two solder resist openings are not disconnected, the two detection resistors corresponding to the undisconnected solder resist openings are connected in parallel, 3.3V is divided to the ground, and the sensing value outputted by the voltage output port OUT is 1.52V.

[0074] When two of the three solder resist openings are disconnected and the other one is not disconnected, a detection resistor corresponding to the undisconnected solder resist opening is connected in parallel, 3.3V is divided to ground, and the sensing value outputted by the voltage output port OUT is 2.08V.

[0075] When the three solder mask openings B1, B2 and B3 are disconnected, the detection resistors R1, R2 and R3 are not connected to the circuit, 3.3V has no voltage division to ground, and the sensed value outputted by the voltage output port OUT is 3.3V.

[0076] In addition, when wet dust corrosion occurs, the equivalent resistance is corroded in parallel at the detection resistor or a short circuit occurs, and the equivalent resistance of the resistors other than the first voltage-dividing resistor Rf0 decreases, and accordingly, the sensed value output by the voltage output port OUT decreases. If the above-mentioned corrosion open circuit does not exist, the sensed value output by the voltage output port OUT will be less than 1.19V.

[0077] Accordingly, the corrosion situation can be judged in the following manner: when the sensed value output by the voltage output port OUT is at [0, 1.19V), it can be determined that wet dust corrosion occurs on the PCB board.

[0078] When the sensing value of the voltage output port OUT is 1.19V and is located at [1.19V, 1.52V), it can be considered that there is no corrosion on the PCB circuit board; when the sensing value of the voltage output port OUT is located at [1.19V, 1.52V), the corrosion condition can be considered to be mild corrosion; when the sensing value of the voltage output port OUT is located at [1.52V, 2.08V), the corrosion condition can be considered to be moderate corrosion; when the sensing value of the voltage output port OUT is located at [2.08V, 3.3V), the corrosion condition can be considered to be severe dust accumulation.

[0079] In the above embodiment, the wet dust corrosion detection is mainly realized by the branch corresponding to the detection resistor Ri, but when the detection resistor Ri is not centrally set or is set at different positions, it is not easy to realize the wet dust detection. Therefore, the wet dust detection can be carried out by setting an additional detection wire.

[0080] For ease of understanding, in the above embodiments, the first voltage-dividing impedance unit, the second voltage-dividing impedance unit and the detection impedance unit are all composed of resistor elements. In other embodiments, if it is inconvenient to use resistor elements, the impedance unit can be composed of one of an inductor and a capacitor, or at least two of the resistor, inductor and inductor connected in series and parallel. Different sensing values ​​for corrosion and non-corrosion conditions are achieved through the equivalent impedance voltage division of the first voltage-dividing impedance unit, the second voltage-dividing impedance unit and multiple detection impedance units.

[0081] In some embodiments, Figure 7 As shown, the corrosion detection circuit also includes at least one detection wire Lj, ​​and the detection wire has no additional impedance element except its own impedance. Wherein, j can be 1, 2, 3...m, m≥1 and m is a positive integer.

[0082] The first end of the detection wire Lj is connected to the first parallel connection end, and the second end of the detection wire is close to the second parallel connection end and is suspended;

[0083] Alternatively, the first end of the detection wire Lj is connected to the second parallel end, and the second end of the detection wire is close to the first parallel end and suspended.

[0084] In this embodiment, the first end of each detection wire Lj can be connected to the first parallel terminal or the second parallel terminal, and the second end is suspended. When wet dust corrosion exists, the wet dust can connect the second end to other positions in the corrosion detection circuit, and connect a corrosion equivalent resistor Rx, so that the resistance value of the equivalent resistor formed by the resistor other than the first voltage divider resistor Rf1 (i.e., the detection resistor Ri and the corrosion equivalent resistor Rx) changes, thereby changing the sensed value output by the voltage output port OUT. The detection wire can be an electrical connection path set inside the PCB board, or it can be an open wire electrical connection path set on the surface of the PCB, which is not limited here. Multiple detection wires and multiple detection impedance units can be set alternately to reduce the PCB space occupied by the detection circuit.

[0085] For details, please refer to Figure 8 , Figure 8 The ellipse in the figure is the possible location of wet dust. When any wet dust exists, there will be a corrosion equivalent resistor Rx in parallel with the detection resistor Ri. When the resistance of the corrosion equivalent resistor Rx is small enough, the detection resistor Ri will be short-circuited.

[0086] Optionally, the second end of each detection wire Li can be suspended at different positions close to the first parallel end or the second parallel end, so as to detect wet dust at different positions and ensure the accuracy of wet dust detection.

[0087] Optional, such as Fig. 9 As shown, the corrosion detection circuit may include a first voltage-dividing resistor Rf1, a detection resistor R1, a detection wire L1 and a voltage output port OUT.

[0088] The first voltage-dividing resistor Rf1 and the detection resistor R1 are connected in series between the power supply and the ground line, and a solder resist layer opening is provided on the series connection line.

[0089] One end of the detection wire L1 is connected to the connection point between the first voltage-dividing resistor Rf1 and the detection resistor R1, and the other end of the detection wire L1 is close to the other end of the detection resistor R1 and is suspended. Alternatively, one end of the detection wire L1 is close to the connection point between the first voltage-dividing resistor Rf1 and the detection resistor R1 and is suspended, and the other end of the detection wire L1 is connected to the other end of the detection resistor R1.

[0090] The detection resistor R1, the solder mask opening B1 and the detection wire L1 can be used to perform simple and rapid detection of corrosion open circuit and wet dust corrosion of the PCB board.

[0091] Correspondingly, the solder resist layer opening corresponding to the detection resistor R1 may not be provided, and detection may be performed only through the provided detection wire L1, so that wet dust corrosion detection of the PCB board may be performed separately.

[0092] The specific corrosion conditions and detection can be referred to the above embodiments, which will not be described in detail here.

[0093] In some embodiments, Fig.10 As shown, the corrosion detection circuit also includes a second voltage-dividing resistor Rf2; the second parallel terminal is connected to the power supply VCC or the ground GND through the second voltage-dividing resistor Rf2.

[0094] In this embodiment, a second voltage-dividing resistor Rf2 may be connected in series in the corrosion detection circuit, and the second voltage-dividing resistor Rf2 may be used to limit the current to protect the components in the corrosion detection circuit.

[0095] Here, the first end of the detection wire Lj may be connected to the first parallel end or the second parallel end, and the second end may be suspended near the second parallel end, or suspended near the first parallel end.

[0096] In the above case, when wet dust corrosion causes a short circuit, the detection resistor Ri is short-circuited. When the detection wire Lj is short-circuited, there are still the first voltage-dividing resistor Rf1 and the second voltage-dividing resistor Rf2 in the main circuit. The current in the circuit will not increase sharply, which can prevent damage to the components in the circuit.

[0097] In addition, see Fig.11 As shown, Fig.11 The oval in the figure indicates the possible location of wet dust. The first end of the detection wire Li can be connected to the first parallel terminal, and the second end can also be suspended near the target endpoint, which refers to the endpoint of the second voltage-dividing resistor Rf2 connected to the power supply VCC or the ground GND.

[0098] When wet dust corrosion occurs here and causes a short circuit, the detection resistor Ri and the second voltage-dividing resistor Rf2 will both be short-circuited. In this case, the sensing value output by the voltage output port OUT is different from the sensing value when only the detection resistor Ri is short-circuited. Therefore, the location where the short circuit caused by wet dust corrosion occurs can be distinguished by setting different detection wires Lj at different positions.

[0099] Correspondingly, the first end of the detection wire Lj can also be connected to the above-mentioned target endpoint, and the second end of the detection wire Lj is suspended near the first parallel end.

[0100] The present application also provides a circuit board and a power supply device. For details not described in detail, reference can be made to the corresponding circuit embodiments described above.

[0101] In some embodiments, the PCB may include a corrosion detection circuit as in any of the above embodiments.

[0102] In some embodiments, the power supply device may include a heat dissipation channel and a PCB as described above; the corrosion detection circuit of the PCB is located in the heat dissipation channel, and the distance between the corrosion detection circuit and the air inlet of the heat dissipation channel is greater than a preset length to facilitate detection of dust accumulation.

[0103] In one embodiment, the power supply device further includes a display device; the display device is used to display the corrosion result corresponding to the sensing value output by the corrosion detection circuit.

[0104] Here, the display device may be a display screen, on which the sensing value, corrosion condition, and warning information, etc. may be displayed. The display device may also be an alarm light, which may display different colors according to the corrosion condition, such as green or no light for no corrosion, yellow for mild corrosion, orange for moderate corrosion, and red for severe corrosion; or, different numbers of lights may be lit according to the corrosion condition, such as one red light for mild corrosion, two red lights for moderate corrosion, and three red lights for severe corrosion.

[0105] In addition, an alarm device can be set up. When corrosion occurs, the alarm device can issue an alarm reminder and send the alarm information to relevant staff.

[0106] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A corrosion detection circuit, characterized in that: Applied to PCB, the corrosion detection circuit includes a first voltage-dividing impedance unit, a voltage output port, and a plurality of detection impedance units; Each detection impedance unit is connected in parallel, and a corrosion sensing area is provided on a branch corresponding to each detection impedance unit, and the corrosion sensing area is used to disconnect the electrical connection path of the PCB when it is corroded; The first parallel terminal of each detection impedance unit is connected to the first terminal of the first voltage dividing impedance unit; One of the second parallel-connected ends of each detection impedance unit and the second end of the first voltage-dividing impedance unit is used to connect to a power supply, and the other is used to ground; The voltage output port is connected to the first end of the first voltage-dividing impedance unit; wherein the voltage output port is used to output the sensing value.

2. The corrosion detection circuit according to claim 1, characterized in that: The corrosion sensing area corresponding to each detection impedance unit has a different corrosion threshold for disconnection when corroded.

3. The corrosion detection circuit according to claim 2, characterized in that: The wire diameters of the connecting wires in the corrosion sensing area corresponding to each detection impedance unit are different.

4. The corrosion detection circuit according to claim 2 or 3, characterized in that: The corrosion sensing area corresponding to each detection impedance unit is centrally placed, and the impedance value of each detection impedance unit is the same.

5. The corrosion detection circuit according to any one of claims 1 to 4, characterized in that: The corrosion detection circuit also includes at least one detection wire; The first end of the detection wire is connected to the first parallel connection end, and the second end of the detection wire is close to the second parallel connection end and is suspended; Alternatively, the first end of the detection wire is connected to the second parallel end, and the second end of the detection wire is close to the first parallel end and suspended.

6. The corrosion detection circuit according to claim 5, characterized in that: The corrosion detection circuit also includes a second voltage-dividing impedance unit; The second parallel terminal is connected to a power supply or ground through the second voltage-dividing impedance unit.

7. The corrosion detection circuit according to any one of claims 1 to 4, characterized in that: The corrosion detection circuit also includes a capacitor; The capacitor is connected between the first parallel terminal and the second parallel terminal.

8. A PCB, characterized in that: The method comprises the corrosion detection circuit as claimed in any one of claims 1 to 7 above.

9. A power supply device, characterized in that: comprising a heat dissipation channel and a PCB as claimed in claim 8; The corrosion detection circuit of the PCB is located in the heat dissipation channel, and the distance between the corrosion detection circuit and the air inlet of the heat dissipation channel is greater than a preset length.

10. The power supply device according to claim 9, characterized in that: The power supply device also includes a display device; The display device is used to display the corrosion result corresponding to the sensing value output by the corrosion detection circuit.

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