Three-phase calibration current determination method, detection circuit, compressor, temperature adjusting equipment and vehicle

Abstract

The invention discloses a three-phase calibration current determination method, a detection circuit, a compressor, temperature adjusting equipment and a vehicle, and relates to the technical field of electronic power. The three-phase calibration current determination method comprises the following steps: obtaining a target current parameter and a target voltage sampling parameter of a bridge arm corresponding to each target power device in an inverter circuit, wherein each target power device is a conduction power device located at different upper bridge arms or different lower bridge arms; determining an on-resistance parameter of each target power device according to each target current parameter and each target voltage sampling parameter; and determining a three-phase calibration current according to each on-resistance parameter and the periodic voltage sampling parameter of each target power device under the condition of determining that the difference value of each on-resistance parameter is not greater than a preset threshold value. By adopting the three-phase calibration current determination method, the accurate three-phase calibration current can be obtained.

Description

Technical Field

[0001] This application relates to the field of electronic and electrical technology, and in particular to a method for determining three-phase calibration current, a detection circuit, a compressor, a temperature control device, and a vehicle. Background Technology

[0002] In the control process of a three-phase motor, phase current sampling is a key aspect of motor control technology. By sampling the three-phase current of the three-phase motor, current closed-loop control can be achieved based on current feedback, thereby improving the dynamic response and steady-state performance of the three-phase motor.

[0003] However, the accuracy of current sampling methods in current acquisition is currently low.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is related technology. Summary of the Invention

[0005] The main purpose of this application is to provide a three-phase calibration current determination method, detection circuit, compressor, temperature control equipment and vehicle, which can solve the problem of low accuracy of current acquisition by related current sampling methods.

[0006] To achieve the above objectives, in a first aspect, this application proposes a method for determining three-phase calibration current, the method comprising:

[0007] Obtain the target current parameters and target voltage sampling parameters of each target power device in the inverter circuit corresponding to the bridge arm. Each target power device is a conducting power device located in a different upper bridge arm or a different lower bridge arm.

[0008] The on-resistance parameters of each target power device are determined based on the target current parameters and the target voltage sampling parameters.

[0009] If the difference between each of the on-resistance parameters is determined to be no greater than a preset threshold, the three-phase calibration current is determined based on each of the on-resistance parameters and the periodic voltage sampling parameters of each target power device.

[0010] In one embodiment, the three-phase calibration current determination method further includes:

[0011] If the difference between the on-resistance parameters is greater than a preset threshold, new current parameters and voltage sampling parameters are obtained, and the target current parameters and target voltage sampling parameters are updated according to the new current parameters and voltage sampling parameters.

[0012] In one embodiment, obtaining the target current parameters of the corresponding bridge arm for each target power device in the inverter circuit includes:

[0013] Obtain the sampling current parameters of the target region of the inverter circuit;

[0014] The target current parameters are obtained based on the sampled current parameters of the target region of the inverter circuit.

[0015] In one embodiment, obtaining each of the target current parameters based on the sampled current parameters of the target region of the inverter circuit includes:

[0016] Obtain the single-resistor sampling current parameters of the inverter circuit bus region;

[0017] The step of obtaining each of the target current parameters based on the sampled current parameters of the target region of the inverter circuit includes:

[0018] Based on the single-resistor sampled current parameters, the bridge arm current parameters of at least two bridge arms containing the target power devices are reconstructed.

[0019] Secondly, this application also provides a detection circuit, the detection circuit comprising:

[0020] The first parameter sampling circuit is used to sample each target power device in the inverter circuit and obtain the target voltage sampling parameters of each target power device, wherein each target power device is a conducting power device in different upper arms or different lower arms.

[0021] The second parameter sampling circuit is used to sample and obtain the target current parameters of the corresponding bridge arm of each target power device.

[0022] A control circuit for performing the steps of the three-phase calibration current determination method as described in the first aspect.

[0023] In one embodiment, the first parameter sampling circuit includes at least two voltage sampling circuits; the voltage sampling circuit includes: a voltage divider module, a first detection module, and a processing module;

[0024] The first end of the voltage divider module is connected to the first end of the processing module, and the second end of the voltage divider module is connected to the first end of the target power device.

[0025] The first end of the first detection module is connected to the first end of the processing module, and the second end of the first detection module is connected to the second end of the target power device, the second end of the processing module, and the common ground, respectively. The first detection module is used to detect the first voltage parameter at both ends of the processing module.

[0026] The processing module is used to output a detection current, and determine the second voltage parameter across the voltage divider module based on the parameter information of the detection current and the parameter information of the voltage divider module, and determine the voltage parameter across the target power device based on the first voltage parameter and the second voltage parameter.

[0027] In one embodiment, the voltage divider module includes:

[0028] A first voltage divider circuit, wherein a first terminal of the first voltage divider circuit is connected to a first terminal of the processing module;

[0029] A unidirectional conduction circuit, wherein the first end of the unidirectional conduction circuit is connected to the second end of the first voltage divider circuit, and the second end of the unidirectional conduction circuit is connected to the first end of the target power device, wherein the first end to the second end of the unidirectional conduction circuit is unidirectionally connected.

[0030] In one embodiment, the first voltage divider circuit includes a first voltage divider resistor, and a first terminal of the first voltage divider circuit is connected to a first terminal of the processing module;

[0031] The unidirectional conduction circuit includes at least one first diode, and each first diode is connected in series between the first voltage divider resistor and the first terminal of the target power device.

[0032] The processing module is used to determine a third voltage parameter across the first voltage divider resistor based on the detected current and the resistance parameter of the first voltage divider resistor, to determine a fourth voltage parameter across the unidirectional conduction circuit based on the parameter information of the detected current, the temperature information of the processing module, and a preset temperature gauge, and to determine a second voltage parameter based on the third voltage parameter and the fourth voltage parameter.

[0033] In one embodiment, the first detection module includes:

[0034] An energy storage circuit, wherein a first terminal of the energy storage circuit is connected to a first terminal of the processing module, and a second terminal of the energy storage circuit is connected to a second terminal of the processing module;

[0035] The first sampling circuit is connected to both ends of the energy storage circuit and is used to amplify the voltage sampling signals at both ends of the energy storage circuit and determine the first voltage parameter based on the processed voltage sampling signals.

[0036] In one embodiment, the voltage sampling circuit further includes:

[0037] The second detection module is used to detect the fifth voltage parameter of the unidirectional conduction circuit;

[0038] The processing module is connected to the second detection module and is used to determine the sixth voltage parameter across the first voltage divider circuit based on the detection current and the resistance parameter of the first voltage divider circuit, and to determine the second voltage parameter based on the fifth voltage parameter and the sixth voltage parameter.

[0039] Thirdly, this application also provides a compressor, the compressor comprising: a three-phase motor and an inverter, the inverter comprising an inverter circuit and a detection circuit as described in the second aspect, the inverter circuit being connected to the three-phase motor for driving the three-phase motor to operate.

[0040] Fourthly, this application also provides a temperature control device, including a compressor as described in the third aspect.

[0041] Fifthly, this application also provides a vehicle including the temperature control device as described in the fourth aspect or the compressor as described in the third aspect.

[0042] The aforementioned three-phase calibration current determination method, detection circuit, compressor, temperature control equipment, and vehicle acquire the target current parameters and target voltage sampling parameters of the corresponding bridge arm of each target power device in the inverter circuit. Since each target power device is a conducting power device in a different upper or lower bridge arm, the on-resistance parameters of each target power device in the conducting state can be determined based on the target current parameters and target voltage sampling parameters. The on-resistance parameters of each target power device in the conducting state are related to the characteristics of the target power device itself and can be used as a reference for judging the sampling accuracy. Therefore, if the difference in the on-resistance parameters of each target power device is not greater than a preset threshold, it can be determined that the accuracy of the acquired target current parameters is relatively high, and the on-resistance parameters of each target power device are relatively accurate. Based on the on-resistance parameters and the periodic voltage sampling parameters of each target power device, a relatively accurate three-phase calibration current can be obtained. Based on the three-phase calibration current, the three-phase current can be calibrated, thereby improving the accuracy of the three-phase current. If the difference between the on-resistance parameters is greater than the preset threshold, new target current parameters and voltage sampling parameters are obtained, and each target current parameter and each target voltage sampling parameter is updated according to the new target current parameters and voltage sampling parameters. The above process is repeated until the difference between the on-resistance parameters of each target power device is not greater than the preset threshold, thereby obtaining a more accurate three-phase calibration current. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart illustrating a method for determining three-phase calibration current in one embodiment of this application;

[0046] Figure 2 This is a schematic diagram of the detection circuit in one embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the voltage sampling circuit in one embodiment of this application;

[0048] Figure 4 This is a schematic diagram of the voltage sampling circuit in another embodiment of this application;

[0049] Figure 5 This is a schematic diagram of the structure of a three-phase calibration current determination device in one embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the internal structure of the compressor in one embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1-First parameter sampling circuit, 2-Second parameter sampling circuit, 3-Control circuit, 4-Voltage sampling circuit, 41-Voltage divider module, 411-First voltage divider circuit, 412-One-way conduction circuit, 42-First detection module, 421-Energy storage circuit, 422-First sampling circuit, 4221-Sampling amplification circuit, 4222-Voltage adjustment circuit, 4223-AD sampling circuit, 43-Processing module, 44-Second detection module, 441-Second voltage divider circuit, 442-Second sampling circuit, 4421-Sampling amplification circuit, 4422-Voltage adjustment circuit, 4423-AD sampling circuit.

[0053] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0055] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0056] With the rapid development of new energy technologies, automotive air conditioning compressors have also developed rapidly. The motor is the core component of the air conditioning compressor in new energy vehicles, and phase current sampling is a crucial aspect of motor control technology. Due to cost and reliability considerations, resistance sampling is currently the most common method for sampling phase current. However, the accuracy of current resistance sampling methods for phase current acquisition is relatively low.

[0057] For example, single-resistor sampling requires acquiring two-phase currents within the same cycle, and requires reconstruction and phase shifting. Phase shifting can introduce interference such as harmonics and noise, which makes it impossible to guarantee the accuracy of current acquisition.

[0058] Based on the above issues, such as Figure 1 As shown, this application provides a method for determining a three-phase calibration current, which may include the following steps S101 to S103.

[0059] S101: Obtain the target current parameters and target voltage sampling parameters of each target power device in the inverter circuit corresponding to the bridge arm. Each target power device is a conducting power device located in a different upper bridge arm or a different lower bridge arm.

[0060] Among them, the target current parameter and the target voltage sampling parameter are parameters corresponding to the same moment. Figure 2 For illustrative purposes, the power device may include a switching transistor, with its first terminal connected to the cathode of a diode and its second terminal connected to the anode of the diode. The inverter circuit includes power devices K1, K3, and K5 located in the upper bridge arm and power devices K2, K4, and K6 located in the lower bridge arm. At least two of power devices K1, K3, and K5, or at least two of power devices K2, K4, and K6, can be used as target power devices. For example, power devices K2 and K4 can be used as target power devices, and their voltage parameters in the on-state can be sampled. For ease of explanation, power devices K2 and K4 will be used as target power devices in the following description.

[0061] When power devices K2 and K4 are used as target power devices, each target current parameter includes the current Iu of the bridge arm where power device K2 is located and the current Iv of the bridge arm where power device K4 is located.

[0062] S102: Determine the on-resistance parameters of each target power device based on the target current parameters and the target voltage sampling parameters.

[0063] by Figure 2 Taking the structure shown as an example, this application can be based on Figure 2 The circuit shown collects relevant parameters, such as Figure 2As shown, the current in the bridge arm where the target power device K2 is located is the current flowing through the target power device K2, and the current in the bridge arm where the target power device K4 is located is the current flowing through the target power device K4. After obtaining the target voltage sampling parameters of the target power devices K2 and K4, based on the relationship between voltage, current and resistance, the resistance parameters of each target power device in the on state can be calculated and determined based on the target current parameters and the target voltage sampling parameters of each target power device.

[0064] S103: If the difference between each on-resistance parameter is not greater than the preset threshold, determine the three-phase calibration current based on each on-resistance parameter and the periodic voltage sampling parameter of each target power device.

[0065] The average value of each on-resistance parameter can be used as the target on-resistance parameter, or any one of the on-resistance parameters can be used as the target on-resistance parameter. The three-phase calibration current is determined based on the ratio of the periodic voltage sampling parameter of each target power device in the control cycle to the target on-resistance parameter.

[0066] In applications, the target power device (e.g. Figure 2 The on-resistance parameters of K2 or K4 are difficult to determine specifically, but the on-resistance parameters of each target power device (e.g., Figure 2 The on-resistance parameters of K2 and K4 should be the same. Based on this, the accuracy of each target current parameter can be determined by the on-resistance parameters of each target power device in the on state. Considering sampling error, a preset threshold is set. If the calculated difference of each on-resistance parameter is less than or equal to the preset threshold (the preset threshold is a predetermined value), it can be determined that each target current parameter is accurate. Then, after obtaining the periodic voltage of each target power device in the control cycle through real-time sampling, the three-phase calibration current can be calculated based on the ratio of the periodic sampling voltage to the on-resistance parameter, thereby achieving the calibration of the three-phase current.

[0067] It is understandable that the on-resistance parameters of each target power device in the on-state are related to the characteristics of the target power device itself, and can be used as a reference for judging the sampling accuracy. If the comparison results of each on-resistance parameter meet the preset conditions, it can be determined that each target current parameter is relatively accurate. In this case, the on-resistance parameters of each target power device in the on-state can also be considered accurate parameters. Therefore, after obtaining the periodic voltage sampling parameters of each target power device in the control cycle through real-time sampling, based on the relationship between voltage, current, and resistance, a smooth three-phase current curve, i.e., the three-phase calibration current, can be determined according to the periodic sampling voltage and on-resistance parameters, thereby achieving the calibration of the three-phase current.

[0068] The above-described three-phase calibration current determination method obtains the target current parameters and target voltage sampling parameters of the bridge arm where each target power device is located. Based on the fact that each target power device is a conducting power device in a different bridge arm, the on-resistance parameters of each target power device in the conducting state can be determined according to the target current parameters and target voltage sampling parameters. The on-resistance parameters of each target power device in the conducting state are related to the characteristics of the target power device itself and can be used as a reference for judging the sampling accuracy. Therefore, if the difference in the on-resistance parameters of each target power device is less than or equal to a preset threshold, it can be determined that the accuracy of each target current parameter is relatively high and the on-resistance parameters are relatively accurate. Based on the on-resistance parameters and the periodic voltage sampling parameters of each target power device in the control cycle, a relatively accurate three-phase calibration current can be obtained. Based on the three-phase calibration current, the three-phase current can be calibrated, thereby improving the accuracy of the three-phase current.

[0069] In one embodiment, the three-phase calibration current determination method further includes the steps of: when the difference between each on-resistance parameter is greater than a preset threshold, acquiring new current parameters and voltage sampling parameters, and updating each target current parameter and each target voltage sampling parameter according to the new current parameters and voltage sampling parameters.

[0070] It is understandable that if the comparison results of each on-resistance parameter do not meet the preset conditions, it can be determined that the previous target current parameters have a certain degree of distortion, and the on-resistance parameters will also have a certain degree of distortion. In this case, it is impossible to obtain an accurate three-phase calibration current based on the on-resistance parameters and the periodic voltage sampling parameters. It is necessary to resample, obtain new current and voltage sampling parameters based on the latest sampling parameters, and update each target current and target voltage sampling parameters based on the newly obtained parameters, so that steps S101 to S103 can be repeated based on the updated parameters. The above process is repeated until the comparison results of each on-resistance parameter meet the preset conditions, and the accurate on-resistance parameters of each target power device can be obtained. Thus, the three-phase calibration current is determined based on the periodic sampling voltage and the finally obtained accurate on-resistance parameters, thereby realizing the calibration of the three-phase current.

[0071] In one embodiment, obtaining the target current parameters of the bridge arm corresponding to each target power device in the inverter circuit includes: obtaining the sampled current parameters of the target region of the inverter circuit; and obtaining each target current parameter based on the sampled current parameters of the target region of the inverter circuit.

[0072] The target region can be either the bridge arm containing each target power device or the bus region of the inverter circuit. If the target region is the bridge arm containing each target power device, the bridge arm current can be directly sampled, and the target current parameters can be obtained from the sampled current. If the target region is the bus region of the inverter circuit, the bridge arm current needs to be reconstructed from the sampled current under different vector states of the inverter circuit, and then the target current parameters can be obtained from the reconstructed bridge arm current.

[0073] It is understandable that after determining each target current parameter, the on-resistance parameter corresponding to each target power device can be calculated based on each target current parameter and each target voltage sampling parameter. Thus, if the comparison results of each on-resistance parameter meet the preset conditions, the three-phase calibration current can be obtained to achieve the calibration of the three-phase current.

[0074] In one embodiment, obtaining each target current parameter based on the sampled current parameters of the target region of the inverter circuit includes the step of obtaining the single-resistor sampled current parameters of the bus region (e.g., the bus region) of the inverter circuit.

[0075] Obtaining target current parameters based on the sampled current parameters of the target region of the inverter circuit includes: reconstructing the bridge arm current parameters of at least two bridge arms corresponding to the target power devices based on the sampled current parameters of a single resistor; and obtaining each target current parameter based on the bridge arm current parameters.

[0076] It is understandable that, compared to dual-resistor or triple-resistor sampling methods, single-resistor sampling is less expensive and consumes less additional power due to the sampling resistor. Therefore, using single-resistor sampling can avoid using too many sampling resistors.

[0077] It should be noted that single-resistor sampling requires acquiring two-phase currents within the same cycle, and necessitates reconstruction and phase shifting. Phase shifting introduces interference such as harmonics and noise, compromising the accuracy of current acquisition. However, in this application, the deconstructed phase currents can be calibrated through steps S101 to S103. If the comparison results of each on-resistance parameter meet preset conditions, the deconstructed phase currents can be determined to be relatively accurate, i.e., the target current parameters are relatively accurate. Subsequently, the three-phase calibration currents can be obtained using the periodic voltage sampling parameters and on-resistance parameters of each target power device, thereby avoiding the shortcomings of single-resistor current acquisition and obtaining accurate three-phase currents.

[0078] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the three-phase current determination method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0079] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0080] In one embodiment, such as Figure 2 As shown, this application also provides a detection circuit, which includes: a first parameter sampling circuit 1, a second parameter sampling circuit 2, and a control circuit 3.

[0081] The first parameter sampling circuit 1 is used to sample each target power device (e.g., ...) in the inverter circuit. Figure 2 Sampling is performed on K2 and K4 to obtain the target voltage sampling parameters of each target power device. Each target power device is located in a different upper bridge arm (with K2 and K4 as the reference points). Figure 2 For example, the power devices of the upper bridge arm (at least two of the power devices K1, K3, and K5) or the power devices of different lower bridge arms (at least two of the power devices K2, K4, and K6 of the lower bridge arm).

[0082] The second parameter sampling circuit 2 is used to sample and obtain the target current parameters of each target power device.

[0083] Control circuit 3 is used to execute the steps of the three-phase calibration current determination method as described in any of the above schemes.

[0084] It is understandable that by sampling through the first parameter sampling circuit 1 and the second parameter sampling circuit 2, the target current parameters and target voltage sampling parameters of each target power device can be obtained. Since each target power device is a conducting power device, the control circuit 3 can determine the on-resistance parameters of each target power device in the conducting state based on the current parameters and voltage sampling parameters. The on-resistance parameters of each target power device in the conducting state are related to the characteristics of the target power device itself and can be used as a reference for judging the sampling accuracy. Therefore, when each on-resistance parameter meets the preset condition (i.e., the difference between each on-resistance parameter is less than or equal to the preset threshold), the control circuit 3 can determine that the accuracy of each target current parameter is relatively high and the on-resistance parameters are relatively accurate. Based on each on-resistance parameter and the corresponding periodic voltage sampling parameters of each target power device, a relatively accurate three-phase calibration current can be obtained. Thus, based on the three-phase calibration current, the three-phase current can be calibrated, improving the accuracy of the three-phase current.

[0085] In one embodiment, such as Figure 3 and Figure 4 As shown, the first parameter sampling circuit 1 includes at least two voltage sampling circuits 4 (e.g., Figure 2 The circuit consists of two voltage sampling circuits 4), which are connected to the two ends of the target power device to sample the voltage parameters at its two ends. The voltage sampling circuit 4 may include a voltage divider module 41, a first detection module 42, and a processing module 43.

[0086] The first end of the voltage divider module 41 is connected to the first end of the processing module 43, and the second end of the voltage divider module 41 is connected to the first end of the target power device.

[0087] The first end of the first detection module 42 is connected to the first end of the processing module 43, and the second end of the first detection module 42 is connected to the second end of the target power device, the second end of the processing module 43, and the common ground. The first detection module 42 is used to detect the first voltage parameter at both ends of the processing module 43.

[0088] The processing module 43 is used to output the detection current, and determine the second voltage parameter across the voltage divider module 41 based on the parameter information of the detection current and the parameter information of the voltage divider module 41, and determine the voltage parameter across the target power device based on the first voltage parameter and the second voltage parameter.

[0089] Please see Figure 3 and Figure 4Based on the above connection relationship, the processing module 43, the voltage divider module 41 and the target power device form a current loop. The sum of the voltage across the voltage divider module 41 and the voltage across the target power device is equal to the voltage across the processing module 43. The first detection module 42 is connected to both ends of the processing module 43, so the first detection module 42 can detect the voltage across the processing module 43, that is, detect the first voltage parameter, which is the sum of the voltage across the voltage divider module 41 and the voltage across the target power device.

[0090] In the application, the parameters of the detected current and the voltage divider module 41 are known. Based on the known parameters of the detected current and the voltage divider module 41, the voltage parameter across the voltage divider module 41, i.e., the second voltage parameter, can be determined. Since the first voltage parameter is the sum of the voltage across the voltage divider module 41 and the voltage across the target power device, the difference between the first voltage parameter and the second voltage parameter is the voltage across the target power device. Based on this principle, the processing module 43 can calculate and determine the voltage across the target power device based on the first and second voltage parameters, thereby achieving the measurement of the target power device through the voltage sampling circuit 4.

[0091] The voltage sampling circuit 4 described above connects the voltage divider module 41 to the processing module 43 and the target power device respectively, connects the two ends of the first detection module 42 and the processing module 43, and connects the second end of the first detection module 42 to the common ground. This allows the processing module 43, the voltage divider module 41, and the target power device to form a conducting current loop. The first voltage parameter detected by the first detection module 42 can be determined as the sum of the voltage across the voltage divider module 41 and the voltage across the target power device. The processing module 43 can determine the second voltage parameter based on the known parameter information of the detected current and the known parameter information of the voltage divider module 41. Then, based on the difference between the first voltage parameter and the second voltage parameter, it determines the voltage across the target power device, thereby realizing the measurement of the voltage across the target power device.

[0092] In one embodiment, such as Figure 3 As shown, the voltage divider module 41 includes: a first voltage divider circuit 411 and a unidirectional conduction circuit 412.

[0093] The first terminal of the first voltage divider circuit 411 is connected to the first terminal of the processing module 43.

[0094] The first end of the unidirectional conduction circuit 412 is connected to the second end of the first voltage divider circuit 411, and the second end of the unidirectional conduction circuit 412 is connected to the first end of the target power device. The unidirectional conduction circuit 412 is unidirectionally connected from the first end to the second end.

[0095] It is understood that the voltage sampling circuit 4 needs to sample the target power device in the inverter circuit. Since the target power device is in a conducting state during sampling, current from the inverter circuit will flow through it. In this embodiment, by setting a unidirectional conduction circuit 412 and sampling the above connection method, the current can be blocked from flowing from the second end of the unidirectional conduction current to the first end, thereby avoiding interference from the inverter circuit current and ensuring that the first detection module 42 accurately detects the first voltage parameter across the processing module 43.

[0096] In one embodiment, such as Figure 3 As shown, the first voltage divider circuit 411 includes a voltage divider resistor R0, and the first terminal of the first voltage divider circuit 411 is connected to the first terminal of the processing module 43.

[0097] The unidirectional conduction circuit 412 may include at least one first diode D1, with each first diode D1 connected in series between the voltage divider resistor R0 and the first terminal of the target power device. The first diode D1 can block the current of the inverter circuit, thereby avoiding interference from the inverter circuit current.

[0098] The processing module 43 is used to calculate and determine the third voltage parameter across the voltage divider resistor R0 based on the current parameter of the detected current and the resistance parameter of the voltage divider resistor R0, and to determine the fourth voltage parameter across the unidirectional conduction circuit 412 based on the parameter information of the detected current, the temperature information of the processing module 43 and the preset temperature table (correspondence table between temperature and resistance), and to determine the second voltage parameter based on the third voltage parameter and the fourth voltage parameter.

[0099] It is understandable that, in the presence of multiple first diodes D1, the first diodes D1 are connected in series, and the voltage divider resistor R0 is connected in series with the unidirectional conduction circuit 412. The sum of the voltage divider resistor R0 and the voltages across each first diode D1 equals the voltage across the voltage divider module 41. The voltage divider resistor R0 can be pre-selected, so its resistance parameter is known. The current parameter for detecting the current is also known. Therefore, the processing module 43 can determine the voltage parameter across the voltage divider resistor R0, i.e., the third voltage parameter, based on the known current parameter of the detected current and the known resistance parameter of the voltage divider resistor R0. The voltage across the first diode D1 can be obtained by looking up a table using the temperature read by the processing module 43. After determining the voltage across the first diode D1, since the voltages across all first diodes D1 are the same, the voltage across the unidirectional conduction circuit 412 can be determined, i.e., the fourth voltage parameter. After calculating and determining the second voltage parameter based on the third and fourth voltage parameters, the processing module 43 can determine the voltage across the target power device based on the difference between the first and second voltage parameters, thus achieving the measurement of the voltage across the target power device.

[0100] In one embodiment, such as Figure 3As shown, the first detection module 42 includes an energy storage circuit 421 and a first sampling circuit 422.

[0101] The first terminal of the energy storage circuit 421 is connected to the first terminal of the processing module 43, and the second terminal of the energy storage circuit 421 is connected to the second terminal of the processing module 43. The energy storage circuit 421 may include an energy storage capacitor C, with the first terminal of the energy storage capacitor C serving as the first terminal of the energy storage circuit 421, and the second terminal of the energy storage capacitor C serving as the second terminal of the energy storage circuit 421.

[0102] The first sampling circuit 422 is connected to both ends of the energy storage circuit 421 and is used to amplify the voltage sampling signal at both ends of the energy storage circuit 421 and determine the first voltage parameter based on the processed voltage sampling signal. The first sampling circuit 422 may include a sampling amplification circuit 4221, a voltage adjustment circuit 4222, and an AD sampling circuit 4223. The sampling amplification circuit 4221 amplifies the voltage sampling signal at both ends of the energy storage circuit 421 and outputs it to the voltage adjustment circuit 4222. The AD sampling circuit 4223 obtains the first voltage parameter by sampling the voltage at both ends of the voltage adjustment circuit 4222.

[0103] It is understood that by setting an energy storage circuit 421 between the two ends of the processing module 43, the stability of the voltage across the processing module 43 can be guaranteed based on the characteristics of the energy storage circuit 421, thereby facilitating the sampling of the first sampling circuit 422 and accurately obtaining the voltage across the processing module 43.

[0104] In another embodiment, such as Figure 4 As shown, the voltage sampling circuit 4 also includes a second detection module 44.

[0105] The second detection module 44 is used to detect the fifth voltage parameter across the unidirectional conduction circuit 412.

[0106] The processing module 43 is connected to the second detection module 44 and is used to calculate and determine the sixth voltage parameter across the first voltage divider circuit 411 based on the detection current and the resistance parameter of the first voltage divider circuit 411, and to determine the second voltage parameter based on the fifth voltage parameter and the sixth voltage parameter.

[0107] It is understandable that the resistance parameters of the first voltage divider circuit 411 can be determined in advance. Given that the parameters of the detected current are also known, the voltage across the first voltage divider circuit 411 is fixed. The processing module 43 can determine the sixth voltage parameter based on the detected current and the resistance parameters of the first voltage divider circuit 411. Therefore, it is also necessary to measure the voltage across the unidirectional conduction circuit 412. The second detection module 44 detects the voltage across the unidirectional conduction circuit 412, i.e., the fifth voltage parameter, and can determine the voltage across the unidirectional conduction circuit 412. Based on this, the processing module 43 can determine the second voltage parameter based on the fifth and sixth voltage parameters, and then determine the voltage across the target power device based on the first and second voltage parameters, thus achieving the measurement of the voltage across the target power device.

[0108] In one embodiment, the second detection module 44 includes a second voltage divider circuit 441 and a second sampling circuit 442.

[0109] The first detection terminal of the second voltage divider circuit 441 is connected to the first terminal of the unidirectional conduction circuit 412, and the second detection terminal of the second voltage divider circuit 441 is connected to the second terminal of the unidirectional conduction circuit 412.

[0110] The second sampling circuit 442 is connected to the first sampling terminal and the second sampling terminal of the second voltage divider circuit 441, respectively, and is used to amplify the voltage sampling signal and determine the second voltage parameter based on the processed voltage sampling signal. The second sampling circuit 442 may also include a sampling amplification circuit 4421, a voltage adjustment circuit 4422, and an AD sampling circuit 4423. The sampling amplification circuit 4421 amplifies the voltage sampling signal and outputs it to the voltage adjustment circuit 4422. The AD sampling circuit 4423 obtains the second voltage parameter by sampling the voltage across the voltage adjustment circuit 4422.

[0111] It is understandable that, since the first and second detection terminals of the second voltage divider circuit 441 are located at both ends of the unidirectional conduction circuit 412, the voltage between the first and second sampling terminals of the second voltage divider circuit 441 is related to the voltage across the unidirectional conduction circuit 412. The second sampling circuit 442 can amplify the voltage sampling signal between the first and second sampling terminals and determine the second voltage parameter based on the processed voltage sampling signal, thereby realizing the measurement of the second voltage parameter.

[0112] In one embodiment, the second voltage divider circuit 441 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a second diode D2.

[0113] The first terminal of the first resistor R1 is connected to the first terminal of the unidirectional conduction circuit 412. The first terminal of the second resistor R2 is connected to the second terminal of the first resistor R1 and the first input terminal of the second sampling circuit 442. The first terminal of the third resistor R3 is connected to the second terminal of the unidirectional conduction circuit 412. The first terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3, and the second terminal of the fourth resistor R4 is connected to the second terminal of the second resistor R2 and the common ground. The anode of the second diode D2 is connected to the first terminal of the fourth resistor R4, and the cathode of the diode is used to receive the power supply signal VDD.

[0114] Based on the above circuit structure, V DESAT V is the first voltage parameter. R0 V is the voltage across the first voltage divider circuit 411. DF The voltage across the unidirectional conducting circuit 412 is V. K I represents the voltage parameters across the target power device. CHG To detect the current parameter, R0 is the resistance value across the first voltage divider circuit 411, then V DESAT =V R0 +V DF +V K =I CHG *R0+V DF +V K Let R1 be the resistance parameter of the first resistor, R2 be the resistance parameter of the second resistor, R3 be the resistance parameter of the third resistor, and R4 be the resistance parameter of the fourth resistor. V can be measured through the second sampling circuit 442. DF Since C HYPERLINK\l″bookmarkD124S0″HG and RLIM are known, V DF Given that V DESAT It can be measured and obtained, thus V can be obtained. K The value is used to measure the voltage across the target power device.

[0115] In one embodiment, this application also provides an inverter that includes an inverter circuit and a detection circuit as described in any of the above embodiments.

[0116] The advantages of the inverter relative correlation technology in this embodiment are the same as those of the voltage sampling circuit 4 relative correlation technology described above, and will not be repeated here.

[0117] In one embodiment, the compressor includes a three-phase motor and an inverter. The inverter includes an inverter circuit and a detection circuit as described in the above embodiment. The inverter circuit is connected to the three-phase motor and is used to drive the three-phase motor to operate.

[0118] The advantages of the compressor relative correlation technology in this embodiment are the same as those of the detection circuit relative correlation technology described above, and will not be repeated here.

[0119] In one embodiment, this application also provides a temperature control device, including a compressor as described in any of the above embodiments.

[0120] Temperature control equipment can be a refrigeration device, a heating device, or an electronic device that has both heating and cooling functions. Specifically, temperature control equipment can be refrigerators, air conditioners, etc. Furthermore, air conditioners can be automotive air conditioners, and refrigerators can be automotive refrigerators.

[0121] The advantages of the temperature control device in this embodiment relative to the relevant technology are the same as the advantages of the compressor relative to the relevant technology described above, and will not be repeated here.

[0122] In one embodiment, this application also provides a vehicle including a temperature control device as described in any of the above embodiments or a compressor as described in any of the above embodiments.

[0123] In this embodiment, the vehicle can be any type of vehicle, such as an electric vehicle, a hybrid vehicle, or a gasoline vehicle.

[0124] The advantages of the vehicle relative correlation technology in this embodiment are the same as those of the compressor relative correlation technology described above, and will not be repeated here.

[0125] In one embodiment, such as Figure 5 As shown, this application also provides a three-phase calibration current determination device, which includes: an acquisition module 10, a first determination module 20, and a second determination module 30.

[0126] The acquisition module 10 is used to acquire the target current parameters and target voltage sampling parameters of each target power device (at least two) in the inverter circuit corresponding to the bridge arm. Each target power device is located in a different upper bridge arm (within the bridge arm of the inverter circuit). Figure 2 For example, the power devices of the upper bridge arm (at least two of the power devices K1, K3, and K5) or the power devices of different lower bridge arms (at least two of the power devices K2, K4, and K6 of the lower bridge arm).

[0127] The first determining module 20 is used to determine the on-resistance parameters corresponding to each target power device based on the target current parameters and the target voltage sampling parameters of each target power device.

[0128] The second determining module 30 is used to determine the three-phase calibration current based on each on-resistance parameter and the periodic voltage sampling parameters of each target power device (which are the voltage sampling parameters of one control cycle of the three-phase motor) when the difference between each on-resistance parameter is less than or equal to a preset threshold.

[0129] The following is for reference. Figure 6 The diagram illustrates a structural schematic of a compressor suitable for implementing embodiments of this application. The compressor in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The compressor shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of this application.

[0130] like Figure 6 As shown, the compressor may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for compressor operation. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the compressor to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows a compressor with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented alternatively.

[0131] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0132] The compressor provided in this application, employing the three-phase current determination method described in the above embodiments, can detect the three-phase current in real time. Compared with related technologies, the beneficial effects of the compressor provided in this application are the same as those of the three-phase current determination method provided in the above embodiments, and other technical features of the compressor are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0133] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0134] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0135] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for determining three-phase calibration current, characterized in that, The method for determining the three-phase calibration current includes: Obtain the target current parameters and target voltage sampling parameters of each target power device in the inverter circuit corresponding to the bridge arm. Each target power device is a conducting power device located in a different upper bridge arm or a different lower bridge arm. The on-resistance parameters of each target power device are determined based on the target current parameters and the target voltage sampling parameters. If the difference between each of the on-resistance parameters is determined to be no greater than a preset threshold, the three-phase calibration current is determined based on each of the on-resistance parameters and the periodic voltage sampling parameters of each target power device.

2. The three-phase calibration current determination method as described in claim 1, characterized in that, The method for determining the three-phase calibration current also includes: If the difference between the on-resistance parameters is greater than a preset threshold, new current parameters and voltage sampling parameters are obtained, and the target current parameters and target voltage sampling parameters are updated according to the new current parameters and voltage sampling parameters.

3. The three-phase calibration current determination method as described in claim 1, characterized in that, The acquisition of the target current parameters of the corresponding bridge arm of each target power device in the inverter circuit includes: Obtain the sampling current parameters of the target region of the inverter circuit; The target current parameters are obtained based on the sampled current parameters of the target region of the inverter circuit.

4. The three-phase calibration current determination method as described in claim 3, characterized in that, The target current parameters are obtained based on the sampled current parameters of the target region of the inverter circuit, including: Obtain the single-resistor sampling current parameters of the inverter circuit bus region; The step of obtaining each of the target current parameters based on the sampled current parameters of the target region of the inverter circuit includes: Based on the single-resistor sampled current parameters, the bridge arm current parameters of at least two bridge arms containing the target power devices are reconstructed.

5. A detection circuit, characterized in that, The detection circuit includes: The first parameter sampling circuit is used to sample each target power device in the inverter circuit and obtain the target voltage sampling parameters of each target power device, wherein each target power device is a conducting power device in different upper arms or different lower arms. The second parameter sampling circuit is used to sample and obtain the target current parameters of the corresponding bridge arm of each target power device. A control circuit for performing the steps of the three-phase calibration current determination method as described in any one of claims 1 to 4.

6. The detection circuit according to claim 5, characterized in that, The first parameter sampling circuit includes at least two voltage sampling circuits; the voltage sampling circuit includes: a voltage divider module, a first detection module, and a processing module; The first end of the voltage divider module is connected to the first end of the processing module, and the second end of the voltage divider module is connected to the first end of the target power device. The first end of the first detection module is connected to the first end of the processing module, and the second end of the first detection module is connected to the second end of the target power device, the second end of the processing module, and the common ground, respectively. The first detection module is used to detect the first voltage parameter at both ends of the processing module. The processing module is used to output a detection current, and determine the second voltage parameter across the voltage divider module based on the parameter information of the detection current and the parameter information of the voltage divider module, and determine the voltage parameter across the target power device based on the first voltage parameter and the second voltage parameter.

7. The detection circuit according to claim 6, characterized in that, The voltage divider module includes: A first voltage divider circuit, wherein a first terminal of the first voltage divider circuit is connected to a first terminal of the processing module; A unidirectional conduction circuit, wherein the first end of the unidirectional conduction circuit is connected to the second end of the first voltage divider circuit, and the second end of the unidirectional conduction circuit is connected to the first end of the target power device, wherein the first end to the second end of the unidirectional conduction circuit is unidirectionally connected.

8. The detection circuit according to claim 7, characterized in that, The first voltage divider circuit includes a first voltage divider resistor, and the first terminal of the first voltage divider circuit is connected to the first terminal of the processing module; The unidirectional conduction circuit includes at least one first diode, and each first diode is connected in series between the first voltage divider resistor and the first terminal of the target power device. The processing module is used to determine a third voltage parameter across the first voltage divider resistor based on the detected current and the resistance parameter of the first voltage divider resistor, to determine a fourth voltage parameter across the unidirectional conduction circuit based on the parameter information of the detected current, the temperature information of the processing module, and a preset temperature gauge, and to determine a second voltage parameter based on the third voltage parameter and the fourth voltage parameter.

9. The detection circuit according to claim 6, characterized in that, The first detection module includes: An energy storage circuit, wherein a first terminal of the energy storage circuit is connected to a first terminal of the processing module, and a second terminal of the energy storage circuit is connected to a second terminal of the processing module; The first sampling circuit is connected to both ends of the energy storage circuit and is used to amplify the voltage sampling signals at both ends of the energy storage circuit and determine the first voltage parameter based on the processed voltage sampling signals.

10. The detection circuit according to claim 7, characterized in that, The voltage sampling circuit further includes: The second detection module is used to detect the fifth voltage parameter of the unidirectional conduction circuit; The processing module is connected to the second detection module and is used to determine the sixth voltage parameter across the first voltage divider circuit based on the detection current and the resistance parameter of the first voltage divider circuit, and to determine the second voltage parameter based on the fifth voltage parameter and the sixth voltage parameter.

11. A compressor, characterized in that, The compressor includes a three-phase motor and an inverter. The inverter includes an inverter circuit and a detection circuit as described in any one of claims 5 to 10. The inverter circuit is connected to the three-phase motor and is used to drive the three-phase motor to work.

12. A temperature regulating device, characterized in that, Includes the compressor as described in claim 11.

13. A vehicle, characterized in that, This includes the temperature control device as described in claim 12 or the compressor as described in claim 11.

Images