Protection circuit of compressor, air conditioning system and vehicle

Abstract

The utility model relates to the technical field of vehicles, in particular to a protection circuit of a compressor, an air conditioning system and a vehicle, an IGBT of the compressor is connected with a battery, the protection circuit comprises a current detection loop arranged between the IGBT and the positive electrode of the battery, and on or off of the IGBT is controlled based on current detected by the current detection loop; the bus filtering loop is arranged between the battery positive electrode and the battery negative electrode, and the bus filtering loop absorbs voltage surges generated in the turn-off process of an IGBT (Insulated Gate Bipolar Translator); the overcurrent protection loop is connected with the IGBT, and the overcurrent protection loop absorbs turn-off overcurrent generated in the turn-off process of the IGBT. Therefore, the problem that battery cooling and user experience are affected due to the fact that faults are usually reported and a shutdown strategy is adopted when the compressor has an overcurrent fault in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a protection circuit of a compressor, an air conditioning system and a vehicle. BACKGROUND

[0002] The compressor is a power element in the air conditioning system, which realizes compression and discharge of refrigerant through the movement of the vortex disc. During the operation of the whole vehicle, the air conditioning system mainly provides refrigeration capacity for the passenger cabin and the battery. When the external environment temperature is high or the system load is large, the compressor load is large at this time, and the compressor is prone to overcurrent failure.

[0003] In the related art, when the compressor has a current fault, the conventional processing measure is to report a fault and stop the machine, which affects battery cooling, whole vehicle battery cooling, passenger cabin refrigeration or heating, and user experience. UTILITY MODEL CONTENT

[0004] The present application provides a protection circuit of a compressor, an air conditioning system and a vehicle to solve the problems of reporting a fault and adopting a stop strategy when the compressor has an overcurrent failure, which affects battery cooling and user experience.

[0005] The first aspect of the present application provides a protection circuit of a compressor, the IGBT (Insulated Gate Bipolar Transistor) of the compressor is connected with the battery, wherein the protection circuit comprises: a current detection loop arranged between the IGBT and the positive electrode of the battery, wherein the conduction or turn-off of the IGBT is controlled based on the current detected by the current detection loop; a bus filter loop arranged between the positive electrode of the battery and the negative electrode of the battery, wherein the bus filter loop absorbs the voltage surge generated in the turn-off process of the IGBT; and an overcurrent protection loop connected with the IGBT, wherein the overcurrent protection loop absorbs the turn-off overcurrent generated in the turn-off process of the IGBT.

[0006] Optionally, the bus filter loop comprises a first capacitor and a first resistor, wherein the positive electrode of the first capacitor is connected with the positive electrode of the battery, the negative electrode of the first capacitor is connected with one end of the first resistor, and one end of the first resistor is connected with the negative electrode of the battery.

[0007] Optionally, the IGBT comprises first to sixth transistors, wherein the gates of the first to sixth transistors are connected to the compressor controller, the emitter of the first transistor is connected to the collector of the second transistor, the emitter of the third transistor is connected to the collector of the fourth transistor, the emitter of the fifth transistor is connected to the collector of the sixth transistor, the collectors of the first, third and fifth transistors are connected to the positive electrode of the battery, and the emitters of the second, fourth and sixth transistors are connected to the negative electrode of the battery.

[0008] Optionally, the compressor further comprises first to third inductances and second to fourth resistances of the motor, wherein one end of the first inductance is connected to the emitter of the first transistor, the other end of the first inductance is connected to one end of the second resistance, one end of the second inductance is connected to the emitter of the third transistor, the other end of the second inductance is connected to one end of the third resistance, one end of the third inductance is connected to the emitter of the fifth transistor, the other end of the third inductance is connected to one end of the fourth resistance, and the other ends of the second to fourth resistances are connected.

[0009] Optionally, the current detection circuit comprises a fifth resistance and a current sampler, wherein the current sampler is connected in parallel to the fifth resistance, one end of the fifth resistance is connected to the collectors of the first, third and fifth transistors, and the other end of the fifth resistance is connected to the positive electrode of the battery.

[0010] Optionally, the overcurrent protection circuit comprises a second capacitor, a third capacitor, a sixth resistance, a seventh resistance, a first diode and a second diode, wherein the positive electrode of the second capacitor is connected to the collector of the first transistor, the negative electrode of the second capacitor is connected to one end of the seventh resistance and the anode of the first diode respectively, the other end of the seventh resistance is connected to the negative electrode of the battery, the cathode of the first diode is connected to the emitter of the first transistor, the positive electrode of the third capacitor is connected to the emitter of the first transistor, the negative electrode of the third capacitor is connected to one end of the sixth resistance and the anode of the second diode respectively, the other end of the sixth resistance is connected to the collector of the first transistor, and the cathode of the second diode is connected to the negative electrode of the battery.

[0011] Optionally, the second capacitor and the third capacitor are polyethylene capacitors, polypropylene capacitors or ceramic capacitors wound with high-frequency low-inductance coils.

[0012] Optionally, the sixth resistance and the seventh resistance are hydrogenated film non-inductive resistors.

[0013] The second aspect embodiment of the present application provides an air conditioning system comprising the protection circuit of the compressor described in the above embodiments.

[0014] The third aspect of the present application provides a vehicle comprising the air conditioning system described in the above embodiments.

[0015] Therefore, the present application includes the following beneficial effects:

[0016] The embodiments of the present application can realize the protection circuit when the compressor IGBT is connected with the battery, realize real-time monitoring of the current through the IGBT through the current detection circuit arranged between the IGBT and the positive electrode of the battery, and timely control the conduction or turn-off of the IGBT when overcurrent is detected, so as to avoid damage to the device caused by overcurrent. The bus filter circuit arranged between the positive electrode of the battery and the negative electrode of the battery can absorb the voltage surge generated in the IGBT turn-off process, reduce the influence of voltage fluctuation on the system, improve the stability of the system, the accurate current detection and protection mechanism can reduce the false alarm situation, avoid unnecessary downtime and temperature fluctuation caused by maintenance, and improve the user experience.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A block schematic diagram of a protection circuit according to an embodiment of the present application is provided.

[0020] Figure 2 A schematic diagram of a protection circuit designed at the IGBT according to an embodiment of the present application is provided.

[0021] Explanation of reference signs: protection circuit 10 of the compressor, current detection circuit 100, bus filter circuit 200, overcurrent protection circuit 300, compressor 400, battery 500, first capacitor C1, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, first transistor Q1, second transistor Q2, third transistor Q3, fourth transistor Q4, fifth transistor Q5, sixth transistor Q6, first inductor L1, second inductor L2, third inductor L3, first capacitor C1, second capacitor C2, third capacitor C3, first diode D1 and second diode D2. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0023] The protection circuit of a compressor, an air conditioning system and a vehicle of embodiments of the present application are described below with reference to the drawings.

[0024] Specifically, Figure 1 A block schematic diagram of a protection circuit of a compressor provided by embodiments of the present application.

[0025] As Figure 1 shown, the IGBT of the compressor 400 is connected with the battery 500, and the protection circuit 10 of the compressor comprises: a current detection circuit 100, a bus filter circuit 200 and an overcurrent protection circuit 300.

[0026] The current detection circuit 100 is arranged between the IGBT and the positive electrode of the battery 500, wherein the conduction or turn-off of the IGBT is controlled based on the current detected by the current detection circuit 100; the bus filter circuit 200 is arranged between the positive electrode of the battery 500 and the negative electrode of the battery 500, wherein the bus filter circuit 200 absorbs the voltage surge generated in the turn-off process of the IGBT; and the overcurrent protection circuit 300 is connected with the IGBT, wherein the overcurrent protection circuit 300 absorbs the turn-off overcurrent generated in the turn-off process of the IGBT.

[0027] It can be understood that, by means of the protection circuit adopted when the compressor IGBT is connected with the battery, the current detection circuit arranged between the IGBT and the positive electrode of the battery can monitor the current passing through the IGBT in real time, and when overcurrent is detected, the conduction or turn-off of the IGBT can be timely controlled to avoid damage to the device caused by overcurrent. The bus filter circuit arranged between the positive electrode of the battery and the negative electrode of the battery can absorb the voltage surge generated in the turn-off process of the IGBT, reduce the influence of voltage fluctuation on the system, and improve the stability of the system. The accurate current detection and protection mechanism can reduce the false alarm situation, avoid unnecessary downtime and temperature fluctuation caused by maintenance, and improve the user experience.

[0028] In embodiments of the present application, as Figure 2 shown, the bus filter circuit 200 comprises a first capacitor C1 and a first resistor R1.

[0029] The positive electrode of the first capacitor C1 is connected with the positive electrode of the battery 500, the negative electrode of the first capacitor C1 is connected with one end of the first resistor R1, and one end of the first resistor R1 is connected with the negative electrode of the battery 500.

[0030] It can be understood that the bus filter circuit of the embodiment of the application can filter out high-frequency noise and ripple voltage in the power supply, the capacitor C1 has energy storage and filtering functions, and can absorb high-frequency noise and transient voltage fluctuations; the resistor R1 plays a certain damping role to prevent oscillation in the charging and discharging process of the capacitor C1; when the IGBT is turned off, the inductance in the circuit releases the stored energy, generates voltage surges, and the bus filter circuit can absorb these voltage surges, protect the IGBT and other circuit elements, reduce the influence of voltage fluctuations on the system, and improve the reliability of the entire system.

[0031] It should be noted that the capacitor C1 is usually an electrolytic capacitor or a ceramic capacitor, has a large capacitance, and can effectively filter out low-frequency and high-frequency noise; the resistor R1 is usually a power resistor, can withstand a certain power loss, prevent oscillation in the charging and discharging process of the capacitor C1, and at the same time help consume the excess energy absorbed by the capacitor C1. The bus filter circuit filters out power supply noise, absorbs voltage surges, stabilizes the power supply voltage, and improves the reliability of the system, thereby providing effective protection for power devices such as IGBT, and ensuring stable operation of the power electronic system.

[0032] In the embodiment of the application, the IGBT includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6.

[0033] The gate of each of the first to sixth transistors is connected to the compressor controller, the emitter of the first transistor Q1 is connected to the collector of the second transistor Q2, the emitter of the third transistor Q3 is connected to the collector of the fourth transistor Q4, the emitter of the fifth transistor Q5 is connected to the collector of the sixth transistor Q6, the collectors of the first transistor Q1, the third transistor Q3, and the fifth transistor Q5 are connected to the positive electrode of the battery, and the emitters of the second transistor Q2, the fourth transistor Q4, and the sixth transistor Q6 are connected to the negative electrode of the battery.

[0034] It can be understood that the embodiment of the application uses multiple transistors in parallel or series, which can provide greater driving capability, better filter out noise and ripple in the power supply, provide more stable DC power, and be suitable for high-power applications. Multiple transistors can provide redundancy, so that even if a transistor is damaged, the system can still continue to work, improving the reliability of the system. Through the controller, the conduction and turn-off of part of the transistors are independently controlled, fine current control is realized, the conduction time of each transistor is dynamically adjusted, the performance of the system is optimized, and through reasonable control of the conduction sequence of each transistor, zero-voltage switching or zero-current switching can be realized, switching loss is reduced, and the efficiency of the system is improved.

[0035] In the embodiment of the present application, the compressor 400 further comprises a first inductance L1, a second inductance L2 and a third inductance L3 of the motor; a second resistance R2, a third resistance R3 and a fourth resistance R4.

[0036] The first inductance L1 has one end connected to the emitter of the first transistor Q1 and the other end connected to one end of the second resistance R2; the second inductance L2 has one end connected to the emitter of the third transistor Q3 and the other end connected to one end of the third resistance R3; the third inductance L3 has one end connected to the emitter of the fifth transistor Q5 and the other end connected to one end of the fourth resistance R4; the other ends of the second resistance R2, the third resistance R3 and the fourth resistance R4 are connected.

[0037] It can be understood that the embodiment of the present application can filter out high-frequency noise in the motor winding through the inductances L1, L2 and L3, provide more stable current, reduce electromagnetic interference, limit the current passing through the motor winding through the resistances R2, R3 and R4, prevent damage caused by overcurrent, and realize multiple functions such as filtering, current limiting, damping and energy consumption, thereby improving the stability and reliability of the compressor system, reducing electromagnetic interference and overcurrent impact, and optimizing the performance and energy efficiency of the system.

[0038] In the embodiment of the present application, the current detection circuit 100 comprises a fifth resistance R5 and a current sampler.

[0039] The current sampler is connected in parallel with the fifth resistance R5, one end of the fifth resistance R5 is connected to the collectors of the first transistor Q1, the third transistor Q3 and the fifth transistor Q5, and the other end of the fifth resistance R5 is connected to the positive electrode of the battery 500.

[0040] It can be understood that the current detection circuit 100 of the embodiment of the present application can monitor the current passing through the IGBT in real time through the fifth resistance R5 and the current sampler, the fifth resistance R5 can filter out high-frequency noise and reduce interference in current detection, and the current sampler converts the detected current signal into an electrical signal and transmits it to the compressor controller, thereby realizing real-time monitoring and protection of the IGBT current.

[0041] In the embodiment of the present application, the overcurrent protection circuit 300 comprises a second capacitor C2, a third capacitor C3, a sixth resistance R6, a seventh resistance R7, a first diode D1 and a second diode D2.

[0042] The positive electrode of the second capacitor C2 is connected with the collector of the first transistor Q1, the negative electrode of the second capacitor C2 is connected with one end of the seventh resistor R7 and the anode of the first diode D1 respectively, the other end of the seventh resistor R7 is connected with the negative electrode of the battery 500, the cathode of the first diode D1 is connected with the emitter of the first transistor Q1, the positive electrode of the third capacitor C3 is connected with the emitter of the first transistor Q1, the negative electrode of the third capacitor C3 is connected with one end of the sixth resistor R6 and the anode of the second diode D2 respectively, the other end of the sixth resistor R6 is connected with the collector of the first transistor Q1, and the cathode of the second diode D2 is connected with the negative electrode of the battery 500.

[0043] It can be understood that, in the embodiment of the application, when the IGBT is turned off, the inductance in the circuit releases the stored energy to generate a voltage surge, the second capacitor C2 and the third capacitor C3 can quickly absorb the voltage surge and convert it into electrical energy for storage, thereby reducing the voltage peak, the first diode D1 and the second diode D2 can provide a low-impedance path to enable the surge energy to be released to the ground through D1 and D2 instead of directly impacting the IGBT, and the sixth resistor R6 and the seventh resistor R7 can respectively consume the overcurrent energy absorbed by the third capacitor C3 and the second capacitor C2 to prevent the capacitors from being overcharged, thereby improving the system stability, protecting the IGBT from overcurrent impact, and prolonging the service life of the IGBT.

[0044] In the embodiment of the application, the second capacitor C1 and the third capacitor C2 are polyethylene capacitors, polypropylene capacitors or ceramic capacitors wound with high-frequency low-inductance coils.

[0045] It can be understood that, in the embodiment of the application, the second capacitor C1 and the third capacitor C2 are polyethylene capacitors, polypropylene capacitors or ceramic capacitors wound with high-frequency low-inductance coils, which can have a good filtering effect, quickly absorb voltage surges, protect the IGBT and other circuit elements from high-voltage impact, prolong the service life of the IGBT, reduce electromagnetic interference, and improve the system stability.

[0046] In the embodiment of the application, the sixth resistor R6 and the seventh resistor R7 are hydrogenated film non-inductive resistors.

[0047] It can be understood that, in the embodiment of the application, the sixth resistor R6 and the seventh resistor R7 are hydrogenated film non-inductive resistors, which have high stability, can maintain consistent resistance values for a long time, are not easily affected by environmental factors, can withstand high power, are suitable for high-current and high-power applications, can significantly improve the performance of the overcurrent protection circuit, and ensure that the IGBT and other circuit elements work stably and reliably in high-frequency and high-power applications.

[0048] Specifically, C1, R1 play a bus filter role, a current detection loop is arranged at R6, R7, C3 and R8, C5 constitute a protection loop, when the IGBT is turned off, the energy released in the inductor is absorbed to reduce the turn-off overcurrent; for the selection of elements in the circuit, the capacitors C3, C5 select high-frequency low-inductance coils of polyethylene or polypropylene capacitors, or ceramic capacitors with a capacity of about 2F; the resistor R selects a hydrogenated film non-inductive resistor, the determination of the positive value needs to meet the requirement that the discharge time is obviously less than the main circuit switching period, and the calculation is according to R≤T / 6C, T is the switching period of the main circuit; L1, R2 and L2, R3 and L3, R4 are compressor motor parts, MCU is a control chip, and TMU is an air conditioner controller; when the air conditioner is turned on, the TMU sends a signal to the compressor MCU, the MCU processes the signal and controls the conduction of the IGBT, so as to drive the motor to move; in the process, the current through the IGBT is monitored in real time through the loop at R6, and the signal is fed back to the MCU controller, and the R7, C3 and R8, C5 protection loop is used to avoid transient overcurrent in the circuit.

[0049] The protection circuit of the compressor provided in the embodiment of the present application, by the protection circuit used when the compressor IGBT is connected with the battery, the current detection loop arranged between the IGBT and the positive electrode of the battery, the current through the IGBT is monitored in real time, when overcurrent is detected, the conduction or turn-off of the IGBT can be controlled in time, the device damage caused by overcurrent is avoided, the bus filter loop arranged between the positive electrode of the battery and the negative electrode of the battery can absorb the voltage surge generated in the turn-off process of the IGBT, the influence of voltage fluctuation on the system is reduced, the stability of the system is improved, the accurate current detection and protection mechanism can reduce the false alarm failure, unnecessary downtime and temperature fluctuation caused by maintenance are avoided, and the user experience is improved.

[0050] The embodiment of the present application also provides an air conditioning system, which comprises the protection circuit of the compressor as described in the above embodiment.

[0051] The embodiment of the present application also provides a vehicle, which comprises the air conditioning system as described in the above embodiment.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0053] In addition, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0054] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiments can be instructed by a program to complete the relevant hardware, and the above-mentioned program can be stored in a computer readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A protection circuit for a compressor, characterized in that, The IGBT of the compressor is connected with the battery, wherein the protection circuit comprises: a current detection loop arranged between the IGBT and the positive electrode of the battery, wherein the conduction or turn-off of the IGBT is controlled based on the current detected by the current detection loop; a bus filter loop arranged between the positive electrode of the battery and the negative electrode of the battery, wherein the bus filter loop absorbs the voltage surge generated in the turn-off process of the IGBT; an overcurrent protection loop connected with the IGBT, wherein the overcurrent protection loop absorbs the turn-off overcurrent generated in the turn-off process of the IGBT.

2. The protective circuit for a compressor according to claim 1, characterized in that, The bus filter loop comprises a first capacitor and a first resistor, wherein the positive electrode of the first capacitor is connected with the positive electrode of the battery, the negative electrode of the first capacitor is connected with one end of the first resistor, and the other end of the first resistor is connected with the negative electrode of the battery.

3. The protective circuit for a compressor according to claim 1, wherein The IGBT comprises first to sixth transistors, wherein the gates of the first to sixth transistors are connected with the compressor controller, the emitter of the first transistor is connected with the collector of the second transistor, the emitter of the third transistor is connected with the collector of the fourth transistor, the emitter of the fifth transistor is connected with the collector of the sixth transistor, the collectors of the first, third and fifth transistors are connected with the positive electrode of the battery, and the emitters of the second, fourth and sixth transistors are connected with the negative electrode of the battery.

4. The protective circuit for a compressor according to claim 3, characterized in that, The compressor further comprises first to third inductors and second to fourth resistors of the motor, wherein one end of the first inductor is connected with the emitter of the first transistor, the other end of the first inductor is connected with one end of the second resistor, one end of the second inductor is connected with the emitter of the third transistor, the other end of the second inductor is connected with one end of the third resistor, one end of the third inductor is connected with the emitter of the fifth transistor, the other end of the third inductor is connected with one end of the fourth resistor, and the other ends of the second to fourth resistors are connected.

5. The protective circuit for a compressor according to claim 3, wherein The current detection loop comprises a fifth resistor and a current sampler, wherein the current sampler is connected in parallel with the fifth resistor, one end of the fifth resistor is connected with the collectors of the first, third and fifth transistors, and the other end of the fifth resistor is connected with the positive electrode of the battery.

6. The protective circuit for a compressor according to claim 3, wherein The overcurrent protection loop comprises a second capacitor, a third capacitor, a sixth resistor, a seventh resistor, a first diode and a second diode, wherein the positive electrode of the second capacitor is connected with the collector of the first transistor, the negative electrode of the second capacitor is connected with one end of the seventh resistor and the anode of the first diode respectively, the other end of the seventh resistor is connected with the negative electrode of the battery, the cathode of the first diode is connected with the emitter of the first transistor, the positive electrode of the third capacitor is connected with the emitter of the first transistor, the negative electrode of the third capacitor is connected with one end of the sixth resistor and the anode of the second diode respectively, the other end of the sixth resistor is connected with the collector of the first transistor, and the cathode of the second diode is connected with the negative electrode of the battery.

7. The protective circuit for a compressor according to claim 6, characterized in that, The second capacitor and the third capacitor are selected from a polyethylene capacitor with a high-frequency low-inductance coil, a polypropylene capacitor with a high-frequency low-inductance coil, or a ceramic capacitor.

8. The protective circuit for a compressor according to claim 6, wherein The sixth resistor and the seventh resistor are selected from a hydrogenated film non-inductive resistor.

9. An air conditioning system, characterised in that, A protection circuit of a compressor comprising any one of claims 1-8.

10. A vehicle characterized by comprising: An air conditioning system comprising the compressor of claim 9.

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