Board, Inverter, and Electric compressor including the same

Abstract

The present invention relates to a substrate, an inverter, and an electric compressor including the same, and more specifically, to a substrate for an electric compressor in which a control unit in a high-voltage region of the substrate has been removed, an inverter, and an electric compressor including the same. The object of the present invention is to further simplify the circuit board of the inverter of an electric compressor by removing the MCU in the high-voltage region.

Description

Technology Field

[0001] The present invention relates to a substrate, an inverter, and an electric compressor including the same, and more specifically, to a substrate having a control unit in a high-voltage region of a substrate for an electric compressor removed, an inverter, and an electric compressor including the same. Background Technology

[0002] Generally, vehicles use electric compressors that discharge refrigerant by the rotational force of an electric motor powered by electricity stored in a battery.

[0003] The electric compressor consists of a motor section including a drive motor and a compression section that compresses the refrigerant, and an inverter that controls the rotational speed of the drive motor to variably adjust cooling efficiency is installed on one side of the compressor housing.

[0004] The circuit board of the inverter of an electric compressor generally has two separate voltage regions, a high voltage region and a low voltage region.

[0005] Voltage is supplied from a high-voltage battery (e.g., 150-500V rated voltage) to the high-voltage region. The high-voltage region includes the motor control unit and power output stage of the electric compressor, and the motor control unit includes a switching element.

[0006] In the low-voltage region, the board circuit network voltage (e.g., 12V) is supplied from the battery. The low-voltage region includes an electronic control unit that communicates with the upper controller.

[0007] Meanwhile, switching noise caused by switching elements occurs in the high-voltage region, and the ground (GND) vibrates due to this switching noise, which may cause problems such as malfunction of devices sharing the ground in the high-voltage region, such as the MCU (Micro controller unit).

[0008] FIG. 1 is a configuration diagram showing the circuit board configuration of an inverter of a conventional electric compressor. Referring to FIG. 1, the circuit board of the inverter of a conventional electric compressor includes a first MCU (10) and a second MCU (20) in a high voltage region (HV) and a low voltage region (LV), respectively. Generally, the second MCU (20) in the low voltage region receives a current value detected by a current detection unit (40) in the high voltage region and transmits a control signal to control the driving of the motor based on the current value. At this time, the current value detected by the current detection unit (40) is corrected by an amplifier (50) and transmitted to the first MCU (10), and the first MCU (10) converts the current value into a digital signal and transmits it to a digital isolator (30) via CAN communication. The digital isolator (30) transmits a digital signal for the received current value to the second MCU (20) via CAN communication.

[0009] The circuit boards of such conventional electric compressor inverters have problems such as increased unit costs due to the use of MCUs more expensive than general ICs in the high-voltage and low-voltage regions, the requirement for relatively large packages to configure peripheral circuits, and the need for a relatively large number of peripheral components. The problem to be solved

[0010] The present invention is intended to solve the problems described above, and the objective of the present invention is to further simplify the circuit board of the inverter of an electric compressor by removing the MCU in the high-voltage region. means of solving the problem

[0012] According to one aspect of the present invention, a substrate is disclosed comprising an isolated signal transmission unit that converts and provides a first signal, which is a ground reference of a first power source, into a second signal, which is a ground reference of a second power source, and a control unit that generates a control signal based on the second signal, wherein the substrate comprises a first voltage circuit region to which the first power source is supplied and a second voltage circuit region to which the second power source is supplied, and wherein one side and the other side of the isolated signal transmission unit are respectively provided in the first voltage circuit region and the second voltage circuit region, so that the first voltage circuit region and the second voltage circuit region are separated.

[0013] According to an embodiment, a substrate is disclosed in which the control unit is provided in the second voltage circuit region.

[0014] According to an embodiment, a substrate is disclosed in which the second voltage circuit region further includes a signal correction unit that receives the second signal, corrects it, and generates and transmits a third signal, wherein the third signal is a signal in which the magnitude of the second signal is corrected.

[0015] According to an embodiment, a substrate is disclosed in which the second voltage circuit region is additionally provided with an offset circuit for improving sensing accuracy.

[0016] According to an embodiment, a substrate is disclosed in which the first voltage circuit region includes a switching element for switching control of a motor, and the switching element is controlled by the control unit.

[0017] According to an embodiment, a substrate is disclosed in which the first voltage circuit region includes a current sensing unit for measuring the current of the first voltage circuit region, and the current value measured by the current sensing unit is included in the first signal and transmitted to the isolated signal transmission unit.

[0018] According to an embodiment, a substrate is disclosed in which the control unit generates a control signal for controlling the switch element based on the received current value.

[0019] According to an embodiment, a substrate is disclosed in which the first power source comprises a high voltage of 150[V] or higher, and the second power source comprises a low voltage of 48[V] or lower.

[0020] According to an embodiment, a substrate is disclosed in which the isolated signal transmission unit includes an isolator that physically separates the high voltage and the low voltage.

[0021] According to an embodiment, a substrate is disclosed in which the isolated signal transmission unit includes an isolated amplifier that converts the high voltage to the low voltage.

[0022] According to another aspect of the present invention, an inverter is disclosed comprising a substrate and a plurality of power semiconductors connected to the first power source and supplying power to a motor, wherein the substrate comprises an isolated signal transmission unit that converts and provides a first signal, which is a ground reference of a first power source, into a second signal, which is a ground reference of a second power source, and a control unit that generates a control signal based on the second signal, wherein the first power source and the second power source are independent of each other and the first power source has a voltage magnitude greater than that of the second power source.

[0023] According to another aspect of the present invention, an electric compressor is disclosed comprising a compression device, a motor connected to the compression device, an isolated signal transmission unit that converts and provides a first signal which is a ground reference of a first power source into a second signal which is a ground reference of a second power source, and a control unit that generates a control signal based on the second signal, wherein the first power source and the second power source are independent of each other and the first power source has a voltage magnitude greater than that of the second power source, and an inverter power unit comprising a plurality of power semiconductors connected to the first power source and supplying power to the motor, and an inverter that supplies power to the motor. Effects of the invention

[0024] According to the present invention, costs can be reduced by removing the MCU in the high-voltage region of the substrate.

[0025] In addition, according to the present invention, the circuit can be further simplified by removing the MCU in the high-voltage region of the substrate.

[0026] In addition, according to the present invention, the current value of the high-voltage region can be transmitted to the low-voltage region without passing through the MCU of the high-voltage region, thereby improving the current sensing processing speed. Brief explanation of the drawing

[0027] Figure 1 is a configuration diagram showing the circuit board of a conventional electric compressor inverter. FIGS. 2 to 5 are configuration diagrams showing the configuration of a substrate of an inverter of an electric compressor according to an embodiment of the present invention. Specific details for implementing the invention

[0028] The objects, features, and advantages of the present invention described above will become more apparent through the following embodiments in connection with the accompanying drawings. The specific structural or functional descriptions below are merely illustrative for the purpose of explaining other embodiments of the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application. Since embodiments according to the concept of the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Terms such as "first" and / or "second" may be used to describe various components, but said components are not limited to said terms. The above terms may be used solely for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, such that the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that a component is connected to or coupled with another component, it should be understood that it may be directly connected to or coupled with that other component, or that there may be other components in between. On the other hand, when it is stated that a component is directly connected to or directly coupled with another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as between, immediately between, adjacent to, and directly adjacent to, should be interpreted in the same way.The terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "include" or "have" in this specification are intended to indicate the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification. The invention will be described in detail below by describing preferred embodiments of the invention with reference to the accompanying drawings. Identical reference numerals in each drawing indicate identical components.

[0029] FIGS. 2 to 5 are configuration diagrams showing the configuration of a substrate of an inverter of an electric compressor according to an embodiment of the present invention.

[0030] First, referring to FIG. 2, the substrate of the inverter of an electric compressor according to an embodiment of the present invention includes an isolated signal transmission unit (110), a control unit (130), a switching element (140) connected to a motor, and a current sensing unit (150) for sensing the current of a first voltage circuit region (HV).

[0031] The isolated signal transmission unit (110) can convert and provide a first signal, which is a ground reference of a first power source, into a second signal, which is a ground reference of a second power source. The first power source is a high voltage of 150[V] or higher and can be supplied by a battery. Additionally, the first signal may include a sensing value of the current of a first voltage circuit region (HV) generated by a current sensing unit (150). The isolated signal transmission unit (110) may include an isolated isolator to physically separate the substrate into a first voltage circuit region (HV) and a second voltage circuit region (LV). Additionally, the isolated signal transmission unit (110) may include an amplifier for converting the first signal, which is a high voltage signal, into a second signal, which is a low voltage signal.

[0032] The control unit (130) can generate a control signal for controlling the motor based on the second signal. The control signal generated by the control unit (130) is transmitted to a switching element (140) located in a high voltage region, and the switching element (140) connected to the motor can be controlled based on the current value included in the second signal.

[0033] At this time, one side and the other side of the isolated signal transmission unit (110) are each provided in a first voltage circuit area (HV) where a first power supply is provided and a second voltage circuit area (LV) where a second voltage of 48[V] or less is supplied, so that the substrate can be separated into a first voltage circuit area (HV) and a second voltage circuit area (LV).

[0034] The first voltage circuit region (HV) may include a switching element (140) connected to a motor to switch and control the motor. The switching element (140) may be controlled by a control signal received from a control unit (130) provided in the second voltage circuit region (LV).

[0035] Additionally, the first voltage circuit region (HV) may include a current sensing unit (150) for measuring the current of the first voltage circuit region (HV). The current sensing unit (150) may measure the current of the first voltage circuit region (HV), include the measured current value in the first signal, and transmit it to the isolated signal transmission unit (110). The current sensing unit (150) may include a component such as a shunt resistor to measure the current of the first voltage circuit region (HV). The current measurement method of the current sensing unit (150) is not limited to the aforementioned shunt resistor and can be implemented in various ways by known techniques.

[0036] Additionally, referring to FIG. 3, the substrate of the inverter of an electric compressor according to an embodiment of the present invention includes an isolated signal transmission unit (110) and a control unit (130), and may further include a signal correction unit (120) in a second voltage circuit region (LV). It may also include a switching element (140) connected to a motor and a current sensing unit (150) for detecting the current in a first voltage circuit region (HV).

[0037] The signal correction unit (120) can receive a second signal, correct it to generate a third signal, and transmit the third signal to the control unit. The signal correction unit (120) may include an amplifier. The signal correction unit (120) can correct the second signal into a third signal based on the commercial voltage of the control unit. The third signal generated by the signal correction unit (120) is corrected based on the commercial voltage of the control unit, and the magnitude of the second signal may be corrected.

[0038] The control unit (130) can generate a control signal for controlling the motor based on a third signal. The control signal generated by the control unit (130) is transmitted to a switching element (140) located in a high voltage region, and the switching element (140) connected to the motor can be controlled based on the current value included in the third signal.

[0039] At this time, one side and the other side of the isolated signal transmission unit (110) are provided in a first voltage circuit area (HV) where a first power supply is provided and a second voltage circuit area (LV) where a second voltage of 48[V] or less is supplied, respectively, so that the substrate can be separated into a first voltage circuit area (HV) and a second voltage circuit area (LV). In addition, a signal correction unit (120) and a control unit (130) may be provided in the second voltage circuit area (LV).

[0040] Additionally, referring to FIG. 4, the substrate of the inverter of the electric compressor according to an embodiment of the present invention includes an isolated signal transmission unit (110) and a control unit (130), and may further include a signal correction unit (120) and an offset circuit (121) in a second voltage circuit region (LV). It may also include a switching element (140) connected to a motor and a current sensing unit (150) for sensing the current in a first voltage circuit region (HV).

[0041] The signal correction unit (120) and the offset circuit (121) can receive a second signal and output a third signal in which at least one of the magnitude and offset of the second signal is corrected. The offset circuit (121) can improve sensing accuracy by correcting the offset of the third signal.

[0042] Referring to FIG. 5, the substrate of the inverter of an electric compressor according to an embodiment of the present invention may include a current measuring unit (150) located in a first voltage circuit area (HV) for measuring the current of the first voltage circuit area (HV), an isolated signal transmission unit (110) with one side and the other side respectively provided in the first voltage circuit area (HV) and the second voltage circuit area (LV), a signal correction unit (120) located in the second voltage circuit area (LV) for correcting the second signal into a third signal and outputting it, and a control unit (130) provided in the second voltage circuit area (LV) for generating a control signal based on the third signal.

[0043] That is, the circuit board of the inverter of the electric compressor according to the present invention can be simplified by removing the MCU provided in the conventional first voltage circuit region (HV) and transmitting the first signal generated from the current measuring unit (150) to the control unit (130) provided in the second voltage circuit region (LV) using the isolated signal transmission unit (110) and the signal correction unit (120).

[0044] Although preferred embodiments of the present invention have been described above, the embodiments disclosed in the present invention are intended only to illustrate, not to limit, the technical scope of the present invention. Accordingly, the technical scope of the present invention includes not only each disclosed embodiment but also combinations of the disclosed embodiments, and furthermore, the scope of the technical scope of the present invention is not limited by such embodiments. In addition, a person skilled in the art to which the present invention pertains can make numerous changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications should be considered to fall within the scope of the present invention as equivalents. Furthermore, the upward direction and downward direction disclosed in the present invention refer only to the upper electrode direction and the lower electrode direction, respectively, and do not necessarily mean an upward direction and a downward direction. Explanation of the symbols

[0045] 110: Isolated signal transmission unit 120: Signal correction unit 121 : Offset circuit 130 : Control unit 140 : Switching element 150 : Current sensing unit

Claims

Claim 1 A substrate comprising: an isolated signal transmission unit that converts and provides a first signal, which is a ground reference of a first power source, into a second signal, which is a ground reference of a second power source; and a control unit that generates a control signal based on the second signal; a first voltage circuit region to which the first power source is supplied; and a second voltage circuit region to which the second power source is supplied; wherein one side and the other side of the isolated signal transmission unit are respectively provided in the first voltage circuit region and the second voltage circuit region, so that the first voltage circuit region and the second voltage circuit region are separated. Claim 2 A substrate according to claim 1, wherein the control unit is provided in the second voltage circuit region. Claim 3 A substrate according to claim 2, wherein the second voltage circuit region further includes a signal correction unit that receives the second signal, corrects it, and generates and transmits a third signal, and wherein the third signal is a signal in which the magnitude of the second signal is corrected. Claim 4 A substrate according to paragraph 3, wherein the second voltage circuit region is additionally provided with an offset circuit for improving sensing accuracy. Claim 5 A substrate characterized in that, in paragraph 2, the first voltage circuit region includes a switching element that switches and controls a motor, and the switching element is controlled by the control unit. Claim 6 A substrate according to claim 5, wherein the first voltage circuit region includes a current sensing unit for measuring the current of the first voltage circuit region, and the current value measured by the current sensing unit is included in the first signal and transmitted to the isolated signal transmission unit. Claim 7 A substrate according to claim 6, wherein the control unit generates a control signal for controlling the switch element based on the received current value. Claim 8 A substrate according to claim 1, characterized in that the first power source comprises a high voltage of 150[V] or higher, and the second power source comprises a low voltage of 48[V] or lower. Claim 9 A substrate according to claim 8, wherein the insulating signal transmission unit comprises an isolator that physically separates the high voltage and the low voltage. Claim 10 A substrate according to claim 9, wherein the isolated signal transmission unit comprises an isolated amplifier that converts the high voltage to the low voltage. Claim 11 An inverter comprising: a substrate having the features of claim 1; and an inverter power unit comprising a plurality of power semiconductors connected to the first power source and supplying power to a motor. Claim 12 An electric compressor comprising: a compression device; a motor connected to the compression device; and an inverter having the features of claim 11 and supplying power to the motor.

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