Circuit board and air conditioner

Abstract

The present invention provides a circuit board and an air conditioner. The circuit board includes a first power supply module and a plurality of power factor correction modules. The first power supply module is used to supply power to a load. The plurality of power factor correction modules are connected in parallel. One end of the plurality of power factor correction modules is connected to the power supply module. The circuit board further includes: a first resistor and a fault detection module. One end of the first resistor is connected to the other end of the plurality of power factor correction modules, and the other end of the first resistor is grounded; the input end of the fault detection module is connected to the first resistor, and the output end of the fault detection module is connected to the plurality of power factor correction modules. For the circuit board provided by the present invention, by setting the first resistor to simultaneously detect the currents of the plurality of power factor correction modules, only one grounding point is required for the sampling resistor, and one fault detection circuit can be used to simultaneously detect the plurality of power factor correction modules, avoiding mutual interference between multiple detection circuits, and further avoiding the phenomenon of false overcurrent reporting.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly, to a circuit board and an air conditioner. Background Art

[0002] Currently, in the control circuit of an air conditioner, since multiple IGBT modules are connected in interleaved parallel, multiple sampling resistors need to be provided to sample the current flowing through the IGBT modules to prevent the IGBT modules from being damaged due to overcurrent. In the related art, each IGBT module corresponds to a sampling resistor, and each sampling resistor has a grounding point. However, the voltage difference between multiple grounding points is not easy to handle, resulting in false overcurrent alarms in the detection circuit, which in turn affects the normal operation of the control circuit. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of the present invention provides a circuit board.

[0005] A second aspect of the present invention provides an air conditioner.

[0006] In view of this, a first aspect of the present invention provides a circuit board, including a first power module and multiple power factor correction modules. The first power module is used to supply power to the load, and the multiple power factor correction modules are connected in parallel. One end of the multiple power factor correction modules is connected to the power module. The circuit board further includes: a first resistor and a fault detection module. One end of the first resistor is connected to the other ends of the multiple power factor correction modules, and the other end of the first resistor is grounded; the input end of the fault detection module is connected to the first resistor, and the output end of the fault detection module is connected to the multiple power factor correction modules.

[0007] In the circuit board provided by the present invention, by connecting multiple power factor correction modules in parallel and connecting the parallel bus to the first resistor, the first resistor can simultaneously collect the currents of multiple parallel power factor correction modules. When an overcurrent occurs in any one of the power factor correction modules, the current flowing through the first resistor will increase. After the fault detection circuit detects the increase in the current of the first resistor, it sends an overcurrent signal to the power factor correction module, causing the power factor correction module to stop working, thereby preventing the damage of the power factor correction module; and by setting the first resistor to simultaneously detect the currents of multiple power factor correction modules, only one grounding point is required for the sampling resistor, and one fault detection circuit can simultaneously detect multiple power factor correction modules, avoiding mutual interference between multiple detection circuits, and thus avoiding false overcurrent alarms and ensuring the stable operation of the power factor correction module.

[0008] Specifically, the fault detection circuit collects the voltage across the first resistor, calculates the current of the first resistor based on this voltage and the resistance value of the first resistor, compares the current of the first resistor with a preset current, and then can determine whether the power factor correction module is overcurrent; similarly, the voltage across the first resistor can be collected by the fault detection circuit and compared with a preset voltage to further determine whether the power factor correction module is overcurrent. The first resistor is a sampling resistor.

[0009] In addition, the circuit board in the above technical solution provided by the present invention may further have the following additional technical features:

[0010] In the above technical solution, preferably, each of the multiple power factor correction modules includes: a first inductor, a power switch, a driving module, and a second power supply module. One end of the first inductor is connected to the power supply module; the collector of the power switch is connected to the other end of the first inductor, and the emitter of the power switch is connected to the first resistor; the input end of the driving module is connected to the fault detection module, and the output end of the driving module is connected to the base of the power switch; the second power supply module is connected to the power supply terminal of the driving module.

[0011] In this technical solution, by setting the driving module, the driving module is used to control the conduction and disconnection of the power switch. The driving module is connected to the fault detection module. When an overcurrent phenomenon occurs in the power switch, the fault detection circuit detects overcurrent in the first resistor and sends an overcurrent signal to the driving module. The driving module controls the power switch to turn off, and the power factor correction module stops working. When the power switch works normally and no overcurrent phenomenon occurs, the fault detection circuit sends a normal current signal to the driving module, and the driving circuit controls the power switch to remain in the conduction state, and the power factor correction module works normally. Preferably, the power switch is an IGBT (Insulated Gate Bipolar Transistor) or a MOS transistor (metal-oxide-semiconductor field effect transistor).

[0012] In any of the above technical solutions, preferably, each of the multiple power factor correction modules further includes: a second resistor. One end of the second resistor is connected to the output end of the driving module, and the other end of the second resistor is connected to the base of the power switch.

[0013] In this technical solution, by setting the second resistor, one end of the second resistor is connected to the output end of the driving module, and the other end of the second resistor is connected to the base of the power switch, ensuring that the driving signal sent by the driving module to the power switch is more stable, and further ensuring the stability of the operation of the power switch.

[0014] In any of the above technical solutions, preferably, the second power supply module is connected to the second power supply. The second power supply module includes a voltage stabilization module and an overvoltage protection module. One end of the voltage stabilization module is connected to the second power supply, and the other end is grounded. One end of the overvoltage protection module is connected to the second power supply, and the other end is grounded.

[0015] In this technical solution, the second power supply module is connected to the second power supply. The second power supply is an external power supply, preferably a 15V DC power supply. By setting the voltage stabilization module, the voltage of the drive module is ensured to be stable. By setting the overvoltage protection module, the drive module is prevented from being burned out due to overvoltage of the second power supply. Preferably, the voltage stabilization module includes two parallel capacitors, and the overvoltage protection module is a diode.

[0016] In any of the above technical solutions, preferably, the first power supply module is connected to the first power supply. The first power supply module includes a rectification module. The input end of the rectification module is connected to the first power supply, and the output end of the rectification module is connected to a plurality of power factor correction modules.

[0017] In this technical solution, the first power supply module is connected to the first power supply. The first power supply is an external power supply, preferably an AC power supply. By setting the rectification module, the first power supply is rectified and / or filtered to ensure the stability of the load connected to the first power supply. Preferably, the rectification module includes a filter and / or a rectifier.

[0018] In any of the above technical solutions, preferably, the fault detection module includes a comparison module, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first diode, and a third power supply module. One end of the third resistor is connected to one end of the first resistor, and the other end is connected to the first inverting input end of the comparison module. One end of the fourth resistor is connected to the other end of the first resistor, and the other end is connected to the first non-inverting input end of the comparison module. One end of the fifth resistor is connected to the other end of the third resistor. The other end of the sixth resistor is connected to the other end of the fourth resistor and the other end of the fifth resistor. One end of the first capacitor is connected to the first output end of the comparison module, and the other end is connected to the second non-inverting input end of the comparison module. The positive electrode of the first diode is connected to one end of the first capacitor, and the other end of the first diode is the output end of the fault detection module. The third power supply module is connected to the power supply end of the comparison module and is connected to the other end of the sixth resistor.

[0019] In this technical solution, the operating current determined via the first resistor can be determined by the resistance values of the third resistor and the fourth resistor as pull-up resistors and the fifth resistor and the sixth resistor. In order to avoid disturbing signals in the first resistor, a capacitor is connected in parallel between the first inverting input end of the comparison module and the first non-inverting input end of the comparison module, thereby achieving the function of filtering interference.

[0020] In any of the above technical solutions, preferably, the fault detection module includes: a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a second diode; the seventh resistor is connected to the second reverse input terminal of the comparison module, and the other end is grounded; one end of the eighth resistor is connected to the second reverse input terminal of the comparison module, and the other end is connected to the third power supply module; one end of the ninth resistor is connected to the other end of the first capacitor; one end of the tenth resistor is connected to one end of the first capacitor, and the other end is connected to the other end of the ninth resistor; the positive electrode of the second diode is connected to one end of the tenth resistor, and the negative electrode of the second diode is connected to the other end of the tenth resistor.

[0021] In this technical solution, it is input from the first output terminal of the comparison module to the second positive input terminal of the comparison module, the delay function is realized by using the first capacitor, and it is output from the second output terminal of the comparison module to the control terminal of the power switch, thereby realizing the control of overcurrent.

[0022] In any of the above technical solutions, preferably, the third power supply module is connected to the third power supply, and the third power supply module includes: an eleventh resistor, one end of the eleventh resistor is connected to the third power supply, and the other end of the eleventh resistor is connected to the power supply terminal of the comparison module and is connected to the other end of the sixth resistor.

[0023] In this technical solution, the third power supply module is connected to the third power supply, and the third power supply is an external power supply, preferably a 15V DC power supply; by setting an eleventh resistor between the third power supply and the comparison module, it is avoided that the third power supply is short-circuited on the high-frequency loop, ensuring that the third power supply can be directly connected to the power supply terminal of the comparison module to supply power to the comparison module.

[0024] In any of the above technical solutions, preferably, the grounding point of the seventh resistor, the grounding point of the comparison module, and the grounding point of the first resistor are the same.

[0025] In this technical solution, by grounding the seventh resistor, the comparison module, and the first resistor together, the grounding point of the fault detection module is on the side of the power switch aggregation point of the power factor correction module close to the first resistor, ensuring that the fault detection module is disturbed during operation, ensuring the stability of the operation of the fault detection module, and avoiding the phenomenon of false overcurrent reporting.

[0026] The second aspect of the present invention provides an air conditioner, including the circuit board as described in any of the above technical solutions, so this air conditioner has all the beneficial effects of the circuit board described in any of the above technical solutions.

[0027] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0029] Figure 1 FIG. 4 shows a schematic diagram of a power factor correction module according to an embodiment of the present invention;

[0030] Figure 2 FIG. 8 shows a schematic diagram of a circuit board circuit according to an embodiment of the present invention;

[0031] Figure 3 FIG. 12 shows a schematic diagram of a fault detection module according to an embodiment of the present invention;

[0032] Figure 4 FIG. 16 shows a schematic layout diagram of a circuit board according to an embodiment of the present invention;

[0033] Wherein, Figures 1 to 3 The correspondence between the reference numerals and the component names in FIG. is as follows:

[0034] 1 is a power factor correction module, 12 is a first power factor correction module, 14 is a second power factor correction module, 16 is a third power factor correction module, 102 is a first inductor, 104 is a power switch, 106 is a driving module, 108 is a second power supply module, 1082 is an overvoltage protection module, 1084 is a voltage stabilizing module, 110 is a second resistor, 2 is a fault detection module, 202 is a third resistor, 204 is a fourth resistor, 206 is a fifth resistor, 208 is a sixth resistor, 210 is a seventh resistor, 212 is an eighth resistor, 214 is a ninth resistor, 216 is a tenth resistor, 218 is a first capacitor, 220 is a first diode, 222 is a second diode, 224 is a comparison module, 3 is a first resistor. Detailed Embodiments

[0035] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0036] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0037] The following refers to Figures 1 to 4 Describe the circuit board and air conditioner according to some embodiments of the present invention.

[0038] In the first aspect embodiment of the present invention, as shown in Figures 1 to 3As shown, the present invention provides a circuit board, including a first power module and a plurality of power factor correction modules 1. The first power module is used to supply power to a load. The plurality of power factor correction modules 1 are connected in parallel. One end of the plurality of power factor correction modules 1 is connected to the power module. The circuit board further includes: a first resistor 3 and a fault detection module 2. One end of the first resistor 3 is connected to the other end of the plurality of power factor correction modules 1, and the other end of the first resistor 3 is grounded; the input end of the fault detection module 2 is connected to the first resistor 3, and the output end of the fault detection module 2 is connected to the plurality of power factor correction modules 1.

[0039] In this embodiment, the circuit board connects the plurality of power factor correction modules 1 in parallel, and the bus after parallel connection is connected to the first resistor 3, so that the first resistor 3 can collect the currents of the plurality of parallel-connected power factor correction modules 1 at the same time. When an overcurrent occurs in any one of the power factor correction modules 1, the current flowing through the first resistor 3 will increase. After the fault detection circuit detects the increase in the current of the first resistor 3, it sends an overcurrent signal to the power factor correction module 1, so that the power factor correction module 1 stops working, avoiding damage to the power factor correction module 1; and by setting the first resistor 3 to detect the currents of the plurality of power factor correction modules 1 at the same time, only one grounding point is required for the sampling resistor, and one fault detection circuit can detect the plurality of power factor correction modules 1 at the same time, avoiding mutual interference between multiple detection circuits, and further avoiding the phenomenon of false overcurrent reporting, ensuring the stable operation of the power factor correction module 1.

[0040] Specifically, the fault detection circuit collects the voltage across the first resistor 3, calculates the current of the first resistor 3 according to this voltage and the resistance value of the first resistor 3, compares the current of the first resistor 3 with a preset current, and then it can be judged whether the power factor correction module 1 is overcurrent; similarly, the voltage across the first resistor 3 can be collected by the fault detection circuit and compared with a preset voltage, and then it can be judged whether the power factor correction module 1 is overcurrent. The first resistor 3 is a sampling resistor.

[0041] Preferably, as Figure 2 shown, the plurality of power factor correction modules 1 include three power factor correction modules, namely a first power factor correction module 12, a second power factor correction module 14, and a third power factor correction module 16. The first power factor correction module 12, the second power factor correction module 14, and the third power factor correction module 16 are connected in parallel.

[0042] In an embodiment of the present invention, preferably, as Figure 1As shown, each power factor correction module 1 among multiple power factor correction modules 1 includes: a first inductor 102, a power switch 104, a drive module 106, and a second power supply module 108. One end of the first inductor 102 is connected to the power supply module; the collector of the power switch 104 is connected to the other end of the first inductor 102, and the emitter of the power switch 104 is connected to the first resistor 3; the input end of the drive module 106 is connected to the fault detection module 2, and the output end of the drive module 106 is connected to the base of the power switch 104; the second power supply module 108 is connected to the power supply terminal of the drive module 106.

[0043] In this embodiment, by setting the drive module 106, the drive module 106 is used to control the on and off of the power switch 104. The drive module 106 is connected to the fault detection module 2. When an overcurrent phenomenon occurs in the power switch 104, the fault detection circuit detects overcurrent in the first resistor 3 and sends an overcurrent signal to the drive module 106. The drive module 106 controls the power switch 104 to turn off, and the power factor correction module 1 stops working. When the power switch 104 works normally and no overcurrent phenomenon occurs, the fault detection circuit sends a normal current signal to the drive module 106, and the drive circuit controls the power switch 104 to remain in the on state, and the power factor correction module 1 works normally. Preferably, the power switch 104 is an IGBT (Insulated Gate Bipolar Transistor) or a MOS transistor (metal-oxide-semiconductor field effect transistor).

[0044] In an embodiment of the present invention, preferably, as Figure 1 shown, each power factor correction module 1 among multiple power factor correction modules 1 further includes: a second resistor 110. One end of the second resistor 110 is connected to the output end of the drive module 106, and the other end of the second resistor 110 is connected to the base of the power switch 104.

[0045] In this embodiment, by setting the second resistor 110, one end of the second resistor 110 is connected to the output end of the drive module 106, and the other end of the second resistor 110 is connected to the base of the power switch 104, ensuring that the drive signal sent by the drive module 106 to the power switch 104 is more stable, and further ensuring the stability of the operation of the power switch 104.

[0046] In an embodiment of the present invention, preferably, as [[ID=​15]] Figure 1As shown, the second power supply module 108 is connected to the second power supply. The second power supply module 108 includes: a voltage stabilizing module 1084 and an overvoltage protection module 1082. One end of the voltage stabilizing module 1084 is connected to the second power supply, and the other end is grounded; one end of the overvoltage protection module 1082 is connected to the second power supply, and the other end is grounded.

[0047] In this embodiment, the second power supply module 108 is connected to the second power supply, and the second power supply is an external power supply, preferably a 15V DC power supply; by setting the voltage stabilizing module 1084, the voltage of the driving module 106 is ensured to be stable, and by setting the overvoltage protection module 1082, the driving module 106 is prevented from being burned out due to overvoltage of the second power supply. Preferably, the voltage stabilizing module 1084 includes two parallel capacitors, and the overvoltage protection module 1082 is a diode.

[0048] In an embodiment of the present invention, preferably, the first power supply module is connected to the first power supply. The first power supply module includes: a rectification module. The input end of the rectification module is connected to the first power supply, and the output end of the rectification module is connected to a plurality of power factor correction modules 1.

[0049] In this embodiment, the first power supply module is connected to the first power supply, and the first power supply is an external power supply, preferably an AC power supply; by setting the rectification module, the first power supply is rectified and / or filtered to ensure the stability of the load connected to the first power supply. Preferably, the rectification module includes a filter and / or a rectifier.

[0050] In an embodiment of the present invention, preferably, as Figure 3 shown, the fault detection module 2 includes: a comparison module 224, a third resistor 202, a fourth resistor 204, a fifth resistor 206, a sixth resistor 208, a first capacitor 218, a first diode 220, and a third power supply module; one end of the third resistor 202 is connected to one end of the first resistor 3, and the other end is connected to the first reverse input end of the comparison module 224; one end of the fourth resistor 204 is connected to the other end of the first resistor 3, and the other end is connected to the first positive input end of the comparison module 224; one end of the fifth resistor 206 is connected to the other end of the third resistor 202; the other end of the sixth resistor 208 is connected to the other end of the fourth resistor 204, and the other end is connected to the other end of the fifth resistor 206; one end of the first capacitor 218 is connected to the first output end of the comparison module 224, and the other end is connected to the second positive input end of the comparison module 224; the positive electrode of the first diode 220 is connected to one end of the first capacitor 218, and the other end of the first diode 220 is the output end of the fault detection module 2; the third power supply module is connected to the power supply end of the comparison module 224 and is connected to the other end of the sixth resistor 208.

[0051] In this embodiment, the operating current determined via the first resistor 3 can be determined by the resistance values of the third resistor 202 and the fourth resistor 204 acting as pull-up resistors, and the fifth resistor 206 and the sixth resistor 208. To avoid disturbing signals in the first resistor 3, a capacitor is connected in parallel between the first inverting input terminal of the comparison module 224 and the first non-inverting input terminal of the comparison module 224, thereby achieving the function of filtering interference.

[0052] In one embodiment of the present invention, preferably, as Figure 3 shown, the fault detection module 2 includes: a seventh resistor 210, an eighth resistor 212, a ninth resistor 214, a tenth resistor 216, and a second diode 222; the seventh resistor 210 is connected to the second inverting input terminal of the comparison module 224, and the other end is grounded; one end of the eighth resistor 212 is connected to the second inverting input terminal of the comparison module 224, and the other end is connected to the third power supply module; one end of the ninth resistor 214 is connected to the other end of the first capacitor 218; one end of the tenth resistor 216 is connected to one end of the first capacitor 218, and the other end is connected to the other end of the ninth resistor 214; the positive electrode of the second diode 222 is connected to one end of the tenth resistor 216, and the negative electrode of the second diode 222 is connected to the other end of the tenth resistor 216.

[0053] In this embodiment, it is input from the first output terminal of the comparison module 224 to the second non-inverting input terminal of the comparison module 224, and the first capacitor 218 is used to achieve the delay function. It is output from the second output terminal of the comparison module 224 to the control terminal of the power switch 104, thereby achieving the control of overcurrent.

[0054] In one embodiment of the present invention, preferably, as Figure 3 shown, the third power supply module is connected to the third power supply. The third power supply module includes: an eleventh resistor. One end of the eleventh resistor is connected to the third power supply, and the other end is connected to the power supply terminal of the comparison module 224 and is connected to the other end of the sixth resistor 208.

[0055] In this embodiment, the third power supply module is connected to the third power supply. The third power supply is an external power supply, preferably a 15V DC power supply; by setting the eleventh resistor between the third power supply and the comparison module 224, it is avoided that the third power supply is short-circuited on the high-frequency loop, ensuring that the third power supply can be directly connected to the power supply terminal of the comparison module 224 to supply power to the comparison module 224.

[0056] In one embodiment of the present invention, preferably, the grounding point of the seventh resistor 210, the grounding point of the comparison module 224, and the grounding point of the first resistor 3 are the same.

[0057] In this embodiment, by connecting the seventh resistor 210, the comparison module 224, and the first resistor 3 to the same ground, the grounding point of the fault detection module 2 is on the side of the power switch 104 summing point of the power factor correction module 1 closer to the first resistor 3, ensuring that the fault detection module 2 is interfered during operation, ensuring the stability of the operation of the fault detection module 2, and avoiding the phenomenon of false overcurrent reporting.

[0058] Preferably, as Figure 4 shown, the grounding point of the seventh resistor 210 is located in the area pointed to by arrow A.

[0059] In the embodiment of the second aspect of the present invention, the present invention provides an air conditioner, including the circuit board described in any of the above embodiments. Therefore, the air conditioner has all the beneficial effects of the circuit board described in any of the above embodiments.

[0060] In the description of the present invention, the term "a plurality" means two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of the present invention, the description of terms such as "an embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0062] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circuit board includes a first power module and a plurality of power factor correction modules. The first power module is used to supply power to a load. The plurality of power factor correction modules are connected in parallel, and one end of the plurality of power factor correction modules is connected to the first power module. It is characterized in that, The circuit board further includes: A first resistor, one end of the first resistor is connected to the other ends of the plurality of power factor correction modules, and the other end of the first resistor is grounded; A fault detection module, the input end of the fault detection module is connected to the first resistor, and the output end of the fault detection module is connected to the plurality of power factor correction modules; Wherein, the plurality of power factor correction modules are connected in parallel, and the bus after parallel connection is connected to the first resistor; The fault detection module includes: A comparison module; A third resistor, one end of the third resistor is connected to one end of the first resistor, and the other end is connected to the first inverting input end of the comparison module; A fourth resistor, one end of the fourth resistor is connected to the other end of the first resistor, and the other end is connected to the first non-inverting input end of the comparison module; A fifth resistor, one end of the fifth resistor is connected to the other end of the third resistor; A sixth resistor, the other end of the sixth resistor is connected to the other end of the fourth resistor, and the other end is connected to the other end of the fifth resistor; A first capacitor, one end of the first capacitor is connected to the first output end of the comparison module, and the other end is connected to the second non-inverting input end of the comparison module; A first diode, the positive electrode of the first diode is connected to one end of the first capacitor, and the other end of the first diode is the output end of the fault detection module; A third power supply module, the third power supply module is connected to the power supply end of the comparison module and is connected to the other end of the sixth resistor; Wherein, the first power supply module includes a rectification module, and the rectification module includes a filter and / or a rectifier.

2. The circuit board according to claim 1, wherein Each power factor correction module in the plurality of power factor correction modules includes: A first inductor, one end of the first inductor is connected to the power supply module; A power switch, the collector of the power switch is connected to the other end of the first inductor, and the emitter of the power switch is connected to the first resistor; A drive module, the input end of the drive module is connected to the fault detection module, and the output end of the drive module is connected to the base of the power switch; A second power supply module, the second power supply module is connected to the power supply end of the drive module.

3. The circuit board according to claim 2, wherein Each power factor correction module in the plurality of power factor correction modules further includes: A second resistor, one end of the second resistor is connected to the output end of the drive module, and the other end of the second resistor is connected to the base of the power switch.

4. The circuit board according to claim 2, wherein The second power supply module is connected to a second power supply, and the second power supply module includes: A voltage regulation module, one end of the voltage regulation module is connected to the second power supply, and the other end is grounded; An overvoltage protection module, one end of the overvoltage protection module is connected to the second power supply, and the other end is grounded.

5. The circuit board according to any one of claims 1 to 4, characterized in that The first power supply module is connected to a first power supply; the input end of the rectification module is connected to the first power supply, and the output end of the rectification module is connected to the plurality of power factor correction modules.

6. The circuit board according to claim 1, wherein The fault detection module includes: The seventh resistor, the seventh resistor is connected to the second inverting input terminal of the comparison module, and the other end is grounded; The eighth resistor, one end of the eighth resistor is connected to the second inverting input terminal of the comparison module, and the other end is connected to the third power supply module; The ninth resistor, one end of the ninth resistor is connected to the other end of the first capacitor; The tenth resistor, one end of the tenth resistor is connected to one end of the first capacitor, and the other end is connected to the other end of the ninth resistor; The second diode, the positive electrode of the second diode is connected to one end of the tenth resistor, and the negative electrode of the second diode is connected to the other end of the tenth resistor.

7. The circuit board according to claim 6, characterized in that, The third power supply module is connected to a third power supply, and the third power supply module includes: The eleventh resistor, one end of the eleventh resistor is connected to the third power supply, the other end of the eleventh resistor is connected to the power supply terminal of the comparison module, and is connected to the other end of the sixth resistor.

8. The circuit board according to claim 6, wherein The grounding point of the seventh resistor, the grounding point of the comparison module and the grounding point of the first resistor are the same.

9. An air conditioner, characterized in that, A circuit board including any one of claims 1 to 8.

Images