Reverse connection prevention circuit, electric air conditioner compressor and control method of electric air conditioner compressor

Abstract

The invention provides an anti-reverse-connection circuit, an electric air conditioner compressor and a control method thereof.The circuit comprises a power supply loop composed of a positive electrode wire and a negative electrode wire and an MOS tube, the MOS tube is arranged in the negative electrode wire, and the MOS tube is used for preventing reverse current from passing through in the conducting state; a driving unit; the signal output end of the driving unit is connected with the grid electrode of the MOS tube and is used for continuously providing MOS driving signals at the signal output end when the signal receiving end receives starting signals, the starting signals are generated in response to the fact that the power source is connected to the power supply loop, the reverse current is the current flowing from the first negative electrode connecting end to the second negative electrode connecting end, and the reverse current is the current flowing from the first negative electrode connecting end to the second negative electrode connecting end. And when the MOS tube receives the MOS driving signal, the MOS tube is switched to a conducting state. The problems that the voltage drop of a diode anti-reverse circuit is relatively high, and the power consumption is relatively high under the conditions of low voltage and large current are solved.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to an anti-reverse connection circuit, an electric air-conditioning compressor and a control method thereof. Background Art

[0002] With the development of new energy vehicles, thermal management systems have an important impact on vehicle performance and range. Since low-voltage, high-current compressors consume only about 1,000 watts when fully loaded, they have an absolute advantage in energy consumption in the thermal management system of new energy vehicles. Therefore, they are widely used in new energy vehicles.

[0003] Since the electrical system architecture of new energy vehicles is relatively complex, higher reliability requirements are placed on each component. Once the compressor is reversely connected, it may cause an impact on the entire vehicle's electrical system, affecting the normal operation and safety of the vehicle. Therefore, it is necessary to add effective anti-reverse connection measures to low-voltage and high-current compressors to meet the special application requirements of new energy vehicles.

[0004] At present, diode-based anti-reverse connection circuits are usually used, which use the unidirectional conduction characteristics of diodes to achieve the function of preventing power reverse connection. Since diodes have a fixed voltage drop, when used in low-voltage and high-current scenarios, the larger current will significantly increase the power consumption of the diode, resulting in a series of adverse effects such as heat dissipation difficulties, reduced circuit efficiency, and impact on circuit reliability. Summary of the invention

[0005] The embodiments of the present application provide an anti-reverse connection circuit, an electric air-conditioning compressor and a control method thereof, aiming to solve the problem of increased power consumption when the diode-based anti-reverse connection circuit in the prior art is applied to low voltage and high current.

[0006] In the first aspect, the embodiment of the present application provides an anti-reverse connection circuit. The anti-reverse connection circuit includes: a power supply circuit composed of a positive line and a negative line, the positive line having a first positive connection end connected to the positive pole of the power supply and a second positive connection end connected to the load, and the negative line having a first negative connection end connected to the negative pole of the power supply and a second negative connection end connected to the load; a MOS tube, the MOS tube is arranged in the negative line, and the MOS tube is used to prevent the reverse current from passing when it is in the on state; a driving unit, the driving unit has a signal output end and a signal receiving end, and the signal output end is connected to the gate of the MOS tube; the driving unit is used to continuously provide a MOS driving signal at the signal output end when the signal receiving end receives a start signal; wherein the start signal is generated in response to the power supply being connected to the power supply circuit, the reverse current is a current flowing from the first negative connection end to the second negative connection end, and the gate of the MOS tube switches to the on state when receiving the MOS drive signal.

[0007] In the second aspect, the embodiment of the present application provides an electric air-conditioning compressor. The electric air-conditioning compressor includes: the anti-reverse connection circuit as described above; and a compressor controller, the compressor controller also includes: a voltage detection terminal and a start signal output terminal; wherein the voltage detection terminal is connected to the positive line of the anti-reverse connection circuit, and is used to detect the input voltage of the positive line; the start signal output terminal is connected to the drive unit of the anti-reverse connection circuit, and is used to output a start signal after detecting that the positive line of the anti-reverse connection circuit has an input voltage that meets a preset standard.

[0008] In a third aspect, an embodiment of the present application provides a control method. The control method is applied to a compressor controller of the electric air-conditioning compressor as described above, and includes: obtaining an input voltage of a positive line of a power supply circuit; starting timing when the input voltage exceeds a preset value; and outputting a start signal to a drive unit of an anti-reverse connection circuit after the timing reaches a preset duration.

[0009] The embodiment of the present application provides an anti-reverse connection circuit, an electric air-conditioning compressor and a control method thereof. The anti-reverse connection circuit first sets a MOS tube in the negative line. When a reverse current occurs, the parasitic diode inside the MOS tube is cut off to prevent the reverse current from passing through, thereby achieving an anti-reverse connection effect. There is a small voltage drop between the source and the drain of the MOS tube, thereby avoiding the defect of high power consumption caused by directly using a diode and being unsuitable for low voltage and high current scenarios.

[0010] Moreover, the anti-reverse connection circuit is also provided with a driving unit for providing a MOS driving signal to control the MOS tube to switch to a conducting state. With such a driving unit, the MOS tube can be stably controlled to conduct when the power supply is connected to the power supply circuit, thereby avoiding the problem that the MOS tube cannot work normally because the power supply voltage fails to reach the MOS tube's turn-on voltage after the power supply is connected in a low voltage scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A schematic diagram of an application scenario of the anti-reverse connection circuit provided in an embodiment of the present application; Figure 2 A schematic diagram of an anti-reverse connection circuit provided in an embodiment of the present application; Figure 3 A schematic diagram of a driving unit of an anti-reverse connection circuit provided in an embodiment of the present application; Figure 4 A schematic diagram of an anti-reverse connection circuit provided in another embodiment of the present application; Figure 5 A method flow chart of a control method provided in an embodiment of the present application; Figure 6 This is a functional block diagram of a control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0014] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0015] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0016] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0017] Figure 1 The present invention provides a schematic diagram of an application scenario of the anti-reverse connection circuit provided in an embodiment of the present invention, which shows the situation where the anti-reverse connection circuit is applied to an electric air-conditioning compressor of a new energy vehicle.

[0018] like Figure 1 As shown, the battery pack 10 of the new energy vehicle is used as a power source, and the motor 20 of the electric air conditioner compressor is used as a load. The controller 40 of the electric air conditioner compressor converts the DC power provided by the battery pack 10 into three-phase AC power provided to the motor 20 by controlling the power circuit, driving and controlling the operation of the motor 20.

[0019] The reverse connection prevention circuit 30 forms a power supply loop between the battery pack 10 and the electric air conditioner compressor controller 40, so that the electric energy of the battery pack 10 is transmitted to the electric air conditioner compressor controller 40, and then converted into appropriate three-phase electricity to be provided to the motor 20, driving the operation of the motor 20. The power supply loop is composed of a positive line P and a negative line N.

[0020] Please continue reading Figure 1 The anti-reverse connection circuit 30 also includes: a MOS tube 31 and a driving unit 32.

[0021] The MOS tube 31 is arranged in the negative line N. When it is in the on state, it only allows Figure 1 For example, the source of the MOS transistor 31 is connected to the motor 20 , and the drain of the MOS transistor 31 is connected to the battery pack 10 .

[0022] The driving unit 32 is connected to the gate of the MOS transistor 31, and turns the MOS transistor on or off by providing a MOS driving signal. The driving unit 32 is also connected to the digital signal processor DSP in the controller 30. Under the control of the digital signal processor DSP, the aforementioned MOS driving signal is output.

[0023] In actual application, the voltage detection terminal of the digital signal processor DSP is connected to the positive line P to detect whether an input voltage that meets the preset standard appears in the positive line P, thereby determining whether the battery pack 10 is connected. The preset standard is set according to the needs of the actual situation and is not specifically limited here.

[0024] When the battery pack 10 is connected and the voltage detection terminal of the digital signal processor DSP detects an input voltage that meets the preset standard, the digital signal processor DSP generates a corresponding start signal after a preset time (for example, 3 seconds) and provides it to the drive unit 32. After receiving the start signal, the drive unit 32 outputs a MOS drive signal to drive the MOS tube 31 to switch to the on state.

[0025] When the MOS tube 31 is in the on state, the forward current can smoothly pass through the MOS tube 31 to ensure the smoothness of the power supply circuit, and the battery pack 10 can stably supply power to the motor 20 of the electric air-conditioning compressor.

[0026] However, in the case of reverse connection of the power supply, the MOS tube 31 in the on state can block the reverse current in the opposite direction of the forward current through the internal parasitic diode, thereby achieving the effect of preventing reverse connection.

[0027] It can be understood that although the specific operation process of the anti-reverse connection circuit is described in the embodiment of the present application by taking the electric air-conditioning compressor applied to new energy vehicles as an example, based on the same inventive concept, those skilled in the art can also apply the anti-reverse connection circuit provided in the embodiment of the present application to other scenarios where the anti-reverse connection function needs to be realized.

[0028] In order to fully describe the inventive concept of the present application, the specific composition and operating principle of the anti-reverse connection circuit are described in detail below in combination with one or more specific examples.

[0029] Figure 2 Schematic diagram of the anti-reverse connection circuit provided in the embodiment of the present application. Figure 2 As shown, the anti-reverse connection circuit 30 includes: a power supply circuit, a MOS tube 31 and a driving unit 32.

[0030] The power supply circuit is a circuit composed of a positive line and a negative line, and has an input side connected to the power supply and an output side connected to the load, so as to realize the power transfer between the power supply and the load.

[0031] In the present application, for the sake of simplicity, the end of the input side connected to the positive pole of the power supply is referred to as the first positive pole connection terminal +, the end connected to the negative pole of the power supply is referred to as the first negative pole connection terminal -, the output positive pole on the output side is referred to as the second positive pole connection terminal P1, and the output negative pole on the output side is referred to as the second negative pole connection terminal N1.

[0032] The MOS tube 31 is configured as a switch tube. When it is in the on state, it allows the forward current to pass through while blocking the reverse current, and when it is in the off state, it blocks the forward current from passing through. The forward current refers to the current direction flowing from the second negative electrode connection terminal N1 to the first negative electrode connection terminal -, while the reverse current direction is opposite to it, that is, the current direction flowing from the first negative electrode connection terminal - to the second negative electrode connection terminal N1.

[0033] The driving unit 32 cooperates with the MOS transistor 31 to drive and control the functional circuit of the MOS transistor 31. The driving unit 32 has a signal output terminal 321 connected to the gate of the MOS transistor 31 and a signal output terminal 322 for receiving a start signal. When the signal output terminal 322 receives the start signal, it continuously provides a MOS drive signal at the signal output terminal 321 to drive the MOS transistor 31 to be in a conducting state.

[0034] Specifically, the MOS transistor 31 is an N-channel MOS transistor. The MOS drive signal is a high-level signal greater than the turn-on threshold voltage of the MOS transistor. As the MOS drive signal is applied to the gate of the MOS transistor, the MOS transistor switches to a conducting state.

[0035] The start signal is an indication signal generated when the power supply is connected to the power supply circuit. Based on different actual application scenarios, the start signal is generated in a corresponding manner, and the specific generation method of the start signal is not limited here.

[0036] For example, as mentioned above, the start signal is generated by the digital signal processor DSP of the electric air conditioner compressor. After detecting that the positive line P inputs a high voltage for 3 seconds, the digital signal processor DSP determines that the power supply has been connected to the power supply circuit, thereby generating a high-level start signal.

[0037] In some embodiments, please refer to Figure 2 The anti-reverse connection circuit also includes a common mode inductor T. The common mode inductor T has a first winding and a second winding wound on the same magnetic core. The two windings are respectively arranged in the positive line P and the negative line N to suppress common mode interference and improve EMI performance.

[0038] The two pins of the first winding are respectively marked as a first pin 1 and a fourth pin 4. The first pin 1 of the first winding is connected to the second positive connection terminal P1, and the second pin 4 of the first winding is connected to the first positive connection terminal +.

[0039] The two pins of the second winding are respectively marked as the second pin 2 and the third pin 3. The third pin 3 of the second winding is connected to the first negative connection terminal -, and the second pin 2 of the second winding is connected to the second negative connection terminal N1 through the MOS tube 31.

[0040] Specifically, the source of the MOS tube 31 is connected to the second cathode connection terminal N1, and the drain of the MOS tube is connected to the second pin 2 of the second winding.

[0041] In actual operation, when the differential mode signal (i.e., normal working current) passes through, the magnetic fields generated by the first winding and the second winding cancel each other out, thus presenting a low impedance characteristic. For the common mode signal (i.e., interference signal), the magnetic fields generated by the first winding and the second winding are superimposed, thus presenting a high impedance characteristic, which has the effect of suppressing common mode noise.

[0042] In other embodiments, please refer to Figure 2 The anti-reverse connection circuit also includes: a first capacitor C1, a first resistor R1 and a second resistor R2.

[0043] One end of the first capacitor C1 is connected to the gate of the MOS transistor 31, and the other end of the first capacitor C1 is connected to the source of the MOS transistor 31. As a decoupling capacitor of the gate, it can suppress parasitic oscillation.

[0044] One end of the first resistor R1 is connected to the gate of the MOS transistor 31, and the other end of the first resistor R1 is connected to the source of the MOS transistor 31. This ensures that the MOS transistor is reliably in a cut-off state when there is no driving signal.

[0045] One end of the second resistor R2 is connected to the gate of the MOS tube 31, and the other end of the second resistor R2 is connected to the signal output terminal 321 of the driving unit 32. As a current limiting resistor, it limits the current provided to the gate to ensure the reliable operation of the MOS tube.

[0046] In some embodiments, Figure 3 As shown, the driving unit 32 includes: a MOS tube driving chip U, a second capacitor C2, a third capacitor C3, a third resistor R3 and a fourth resistor R4.

[0047] The first signal input terminal LI of the MOS transistor driver chip U is used to receive a start signal. The power supply terminal VDD of the MOS transistor driver chip U is connected to the voltage source V. The first signal output terminal LO of the MOS transistor driver chip U forms a signal output terminal 321 for outputting a MOS driving signal.

[0048] The voltage source V is a DC power source that provides a preset voltage value (eg, 15V), which is set according to actual needs.

[0049] The MOS tube driving chip U is an active functional circuit for forming a MOS driving signal. Any suitable type of driving chip can be selected according to the actual needs, and no specific limitation is made here.

[0050] One end of the second capacitor C2 is connected to the power supply terminal VDD of the MOS transistor driver chip, and the other end of the second capacitor C2 is connected to the reference ground, which improves the stability of the operating voltage provided to the power supply terminal VDD of the MOS transistor driver chip.

[0051] One end of the third resistor R3 is connected to the first signal input terminal L1 of the MOS tube driver chip, and the other end of the third resistor R3 is connected to the reference ground. One end of the third capacitor C3 is connected to the first signal input terminal L1 of the MOS tube driver chip, and the other end of the third capacitor C3 is connected to the reference ground. The third resistor R3 and the third capacitor C3 form a filter network that can filter out interference signals.

[0052] One end of the fourth resistor R4 is connected to the first signal input terminal LI of the MOS transistor driving chip, and the other end of the fourth resistor R4 forms a signal receiving terminal 322 of the driving unit.

[0053] Specifically, the MOS tube driver chip U is a high-side / low-side MOS driver with dual control channels. In addition to the first signal input terminal LI and the first signal output terminal LO, it also has a second signal input terminal HI and a second signal output terminal HO that constitute another control channel. Please continue to refer to Figure 3 The driving unit 32 further includes: a fifth resistor R5 and a sixth resistor R6.

[0054] One end of the fifth resistor R5 is connected to the second signal input terminal HI of the MOS tube driving chip U, and the other end of the fifth resistor R5 is connected to the reference ground. One end of the sixth resistor R6 is connected to the second cathode connection terminal N1, and the other end of the sixth resistor R6 is connected to the reference ground.

[0055] In some embodiments, Figure 4 As shown, the anti-reverse connection circuit further includes: a first input filter capacitor C4, a second input filter capacitor C5, a third input filter capacitor C6 and a fourth input filter capacitor C7.

[0056] Among them, one end of the first input filter capacitor C4 is connected to the first positive connection terminal + through the positive line, and the other end of the first input filter capacitor C4 is connected to the protective grounding point PE. One end of the second input filter capacitor C5 is connected to the first positive connection terminal + through the positive line, and the other end of the second input filter capacitor C5 is connected to the protective grounding point PE. The first input filter capacitor C4 and the second input filter capacitor C5 connected in parallel between the first positive connection terminal + and the protective grounding point PE together form a filter unit.

[0057] One end of the third input filter capacitor C6 is connected to the first negative connection terminal - through a negative line, and the other end of the third input filter capacitor C6 is connected to the protective grounding point PE. One end of the fourth input filter capacitor C7 is connected to the first negative connection terminal - through a negative line, and the other end of the fourth input filter capacitor C7 is connected to the protective grounding point PE. The third input filter capacitor C6 and the fourth input filter capacitor C7 connected in parallel between the first negative connection terminal - and the protective grounding point PE together form another filter unit.

[0058] The two filter units respectively connected to the positive pole and the negative pole of the power supply play a role in stabilizing the input voltage and reducing voltage ripple.

[0059] In other embodiments, please refer to Figure 4 In addition to the filter unit connected to the positive and negative poles of the power supply, the anti-reverse connection circuit also includes: a fifth input filter capacitor C8, a sixth input filter capacitor C9, a seventh input filter capacitor C10 and an eighth input filter capacitor C11.

[0060] Among them, one end of the fifth input filter capacitor C8 is connected to the second positive connection terminal P1 through the positive line, and the other end of the fifth input filter capacitor is connected to the protective grounding point PE. One end of the sixth input filter capacitor C9 is connected to the second positive connection terminal P1 through the positive line, and the other end of the sixth input filter capacitor C9 is connected to the protective grounding point PE. The fifth input filter capacitor C8 and the sixth input filter capacitor C9 connected in parallel between the second positive connection terminal P1 and the protective grounding point PE together form a filter unit.

[0061] One end of the seventh input filter capacitor C10 is connected to the second negative connection terminal N1 through a negative line, and the other end of the seventh input filter capacitor C10 is connected to the protective grounding point PE. One end of the eighth input filter capacitor C11 is connected to the second negative connection terminal N1 through a negative line, and the other end of the eighth input filter capacitor C11 is connected to the protective grounding point PE. The seventh input filter capacitor C10 and the eighth input filter capacitor C11 connected in parallel between the second negative connection terminal N1 and the protective grounding point PE together constitute another filter unit.

[0062] In summary, the anti-reverse connection circuit first sets a MOS tube in the negative line. When reverse current occurs, the parasitic diode inside the MOS tube is cut off to prevent the reverse current from passing through, thereby achieving the anti-reverse connection effect. There is a small voltage drop between the source and drain of the MOS tube, thus avoiding the defect of high power consumption caused by directly using a diode, which is not suitable for low voltage and high current scenarios.

[0063] Moreover, the anti-reverse connection circuit is also provided with a driving unit for providing a MOS driving signal to control the MOS tube to switch to a conducting state. With such a driving unit, the MOS tube can be stably controlled to conduct when the power supply is connected to the power supply circuit, thereby avoiding the problem that the MOS tube cannot work normally because the power supply voltage fails to reach the MOS tube's turn-on voltage after the power supply is connected in a low voltage scenario.

[0064] Based on the anti-reverse connection circuit provided in the embodiment of the present application, the embodiment of the present application further provides a control method. The control method is executed by any suitable type of controller with logic computing capability (for example, the aforementioned digital signal processor DSP), and generates a start signal in response to the situation where the power supply is connected to the power supply circuit.

[0065] Figure 5 A method flow chart of a control method provided in an embodiment of the present application. In some embodiments, Figure 5 As shown, the control method includes: S501, obtaining the input voltage of the positive line of the power supply circuit.

[0066] The input voltage is obtained by sampling a voltage sampling circuit connected to the positive line. The voltage sampling circuit can use any suitable type of functional circuit as long as it can form an electrical signal proportional to the input voltage, and is not limited here; S502: When the input voltage exceeds a preset value, start timing.

[0067] Among them, the "preset value" is an empirical value set by the technicians according to the actual situation. It is used to determine whether the positive line has high voltage input, so as to determine whether the power supply has been connected to the power supply circuit. "Timing" means starting from the time when the high voltage input appears, and calculating the length of time that has passed; S503: After the timing reaches a preset time, output a start signal to the driving unit of the anti-reverse connection circuit.

[0068] Among them, the "preset duration" is also an empirical value. It can also be set by technicians according to the actual needs (for example, 3 seconds). In other words, after the high voltage input appears and the preset time has passed, the start signal is generated and output to the drive unit. As the drive unit receives the start signal, it generates a MOS drive signal, drives the MOS tube to switch to the on state, and the anti-reverse circuit starts to work.

[0069] The control method detects whether the power supply is connected to the power supply circuit through the input voltage of the positive line, and after confirming the connection, generates a start signal after a suitable time, thereby ensuring the reliable operation of the anti-reverse connection circuit.

[0070] The present application also provides a control device. The control device is used to execute any embodiment of the above control method. Specifically, Figure 6 As shown, the control device 600 includes: a voltage receiving module 610 , a timing module 620 and a start signal generating module 630 .

[0071] The voltage receiving module 610 is used to receive the input voltage of the positive line and determine whether the input voltage exceeds a preset value. The timing module 620 is used to start timing when the voltage receiving module 610 determines that the voltage exceeds the preset value. The start signal generating module 630 is used to generate and output a start signal after the timing module 620 reaches a preset time.

[0072] It should be noted that the module referred to in this application refers to a series of computer program instruction segments that can perform specific functions, which is more suitable for describing the execution process of generating a start signal than a program. For the specific implementation methods of each unit, please refer to the corresponding method embodiments above, which will not be repeated here.

[0073] It will be clear to those skilled in the art that, for the convenience and simplicity of description, the specific working process of the above-described equipment, devices and units can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It will be appreciated by those of ordinary skill in the art that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0074] In the several embodiments provided in the present application, it should be understood that the disclosed equipment, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, and units with the same function may be combined into one unit. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.

[0075] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0076] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0077] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present application is essentially or partly contributed to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories, magnetic disks or optical disks.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A reverse connection protection circuit, characterized in that: include: A power supply circuit consisting of a positive line and a negative line, wherein the positive line has a first positive connection end connected to the positive electrode of the power supply and a second positive connection end connected to the load, and the negative line has a first negative connection end connected to the negative electrode of the power supply and a second negative connection end connected to the load; A MOS tube, wherein the MOS tube is arranged in the negative electrode line, and the MOS tube is used to prevent reverse current from passing through when in a conducting state; A driving unit, wherein the driving unit has a signal output end and a signal receiving end, and the signal output end is connected to the gate of the MOS tube; The driving unit is used to continuously provide a MOS driving signal at the signal output end when the signal receiving end receives a start signal; Among them, the start signal is generated in response to the power supply being connected to the power supply circuit, the reverse current is the current flowing from the first negative electrode connection terminal to the second negative electrode connection terminal, and the gate of the MOS tube switches to the on state when receiving the MOS drive signal.

2. The anti-reverse connection circuit according to claim 1, characterized in that: Also includes: Common mode inductor; The common mode inductor has a first winding and a second winding; Wherein, the first winding is arranged in the positive line, one of the pins of the first winding is connected to the first positive connection end, and the other pin of the first winding is connected to the second positive connection end; The second winding is arranged in the negative electrode line, one of the pins of the second winding is connected to the first negative electrode connection end, and the other pin of the second winding is connected to the second negative electrode connection end through the MOS tube.

3. The anti-reverse connection circuit according to claim 2, characterized in that: The source of the MOS tube is connected to the second cathode connection terminal, and the drain of the MOS tube is connected to the second winding; Wherein, the MOS tube is an N-channel MOS tube.

4. The anti-reverse connection circuit according to claim 1, characterized in that: Also includes: A first capacitor, a first resistor, and a second resistor; Wherein, one end of the first capacitor is connected to the gate of the MOS transistor, and the other end of the first capacitor is connected to the source of the MOS transistor; One end of the first resistor is connected to the gate of the MOS transistor, and the other end of the first resistor is connected to the source of the MOS transistor; One end of the second resistor is connected to the gate of the MOS tube, and the other end of the second resistor is connected to the signal output end of the driving unit.

5. The anti-reverse connection circuit according to claim 1, characterized in that: The driving unit comprises: a MOS tube driving chip, a second capacitor, a third capacitor, a third resistor and a fourth resistor; The first signal input terminal of the MOS tube driver chip is used to receive the start signal, the power supply terminal of the MOS tube driver chip is connected to the voltage source, and the first signal output terminal of the MOS tube driver chip forms the signal output terminal of the drive unit; One end of the second capacitor is connected to the power supply end of the MOS tube driving chip, and the other end of the second capacitor is connected to the reference ground; One end of the third capacitor is connected to the first signal input end of the MOS tube driving chip, and the other end of the third capacitor is connected to the reference ground; One end of the third resistor is connected to the first signal input end of the MOS tube driving chip, and the other end of the third resistor is connected to the reference ground; One end of the fourth resistor is connected to the first signal input end of the MOS tube driving chip, and the other end of the fourth resistor forms a signal receiving end of the driving unit.

6. The anti-reverse connection circuit according to claim 5, characterized in that: The driving unit further includes: a fifth resistor and a sixth resistor; Wherein, one end of the fifth resistor is connected to the second signal input end of the MOS tube driving chip, and the other end of the fifth resistor is connected to the reference ground; One end of the sixth resistor is connected to the second negative electrode connection end, and the other end of the sixth resistor is connected to a reference ground.

7. The anti-reverse connection circuit according to claim 1, characterized in that: Also includes: A first input filter capacitor, a second input filter capacitor, a third input filter capacitor and a fourth input filter capacitor; Wherein, one end of the first input filter capacitor is connected to the first positive connection terminal through the positive line, and the other end of the first input filter capacitor is connected to the protective grounding point; One end of the second input filter capacitor is connected to the first positive connection terminal through the positive line, and the other end of the second input filter capacitor is connected to the protective grounding point; One end of the third input filter capacitor is connected to the first negative connection terminal through the negative line, and the other end of the third input filter capacitor is connected to the protective ground point; One end of the fourth input filter capacitor is connected to the first negative connection terminal through the negative line, and the other end of the fourth input filter capacitor is connected to the protective ground point.

8. The anti-reverse connection circuit according to claim 7, characterized in that: Also includes: a fifth input filter capacitor, a sixth input filter capacitor, a seventh input filter capacitor and an eighth input filter capacitor; Wherein, one end of the fifth input filter capacitor is connected to the second positive connection end through the positive line, and the other end of the fifth input filter capacitor is connected to the protective grounding point; One end of the sixth input filter capacitor is connected to the second positive connection end through the positive line, and the other end of the sixth input filter capacitor is connected to the protective ground point; One end of the seventh input filter capacitor is connected to the second negative electrode connection end through the negative electrode line, and the other end of the seventh input filter capacitor is connected to the protective grounding point; One end of the eighth input filter capacitor is connected to the second negative electrode connection terminal through the negative electrode line, and the other end of the eighth input filter capacitor is connected to the protective ground point.

9. An electric air-conditioning compressor, characterized in that: include: The anti-reverse connection circuit according to any one of claims 1 to 8; as well as A compressor controller, the compressor controller further comprising: a voltage detection terminal and a start signal output terminal; Wherein, the voltage detection terminal is connected to the positive line of the anti-reverse connection circuit, and is used to detect the input voltage of the positive line; The start signal output terminal is connected to the signal receiving terminal of the driving unit of the anti-reverse connection circuit, and is used to output a start signal after detecting that the positive line of the anti-reverse connection circuit has an input voltage that meets a preset standard.

10. A control method, applied to the compressor controller of the electric air-conditioning compressor according to claim 9, characterized in that: include: Obtain the input voltage of the positive line of the power supply circuit; When the input voltage exceeds a preset value, timing begins; After the timing reaches a preset time, a start signal is output to the drive unit of the anti-reverse connection circuit.

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