Filtering device, integrated chip, electronic device and vehicle

Abstract

The application relates to the technical field of filtering, in particular to a filtering device, an integrated chip, an electronic device and a vehicle. The purpose is to improve the filtering performance and safety and reliability of the filtering device, and to reduce the wiring cost and wiring complexity. The filtering device comprises: a first end for coupling a first pole of a power supply and a first pole of a load; and a second end for coupling a second pole of the power supply and a second pole of the load. The filtering device is configured to filter an electrical signal input by the first end and / or the second end, and then output the filtered electrical signal to the load by the first end and / or the second end. By multiplexing the first end and / or the second end of the filtering device, additional signal lines or power supply lines are not required under the condition of meeting the power supply demand of the filtering device, the wiring cost and wiring complexity of the filtering device are reduced, and then the interference factors such as electromagnetic interference and common-mode noise introduced are reduced, and the filtering performance of the filtering device is improved.

Description

Technical Field

[0001] This application relates to the field of filtering technology, and more particularly to a filtering device, integrated chip, electronic device, and vehicle. Background Technology

[0002] Active filtering refers to a technique that combines active electronic components (such as operational amplifiers and transistors) with passive components (such as resistors, capacitors, and inductors) to enhance or suppress signals of a specific frequency and to increase power gain. It is usually powered by a low-voltage power supply.

[0003] In existing technologies, when using active filters to solve problems such as harmonics, noise, and power quality in high-voltage power systems, active filters need to have multiple external wirings, such as signal input lines, signal output lines, power supply lines, and grounding lines, to meet the power supply and filtering requirements of the filter.

[0004] However, the complex external wiring of active filters increases costs and wiring complexity, and can easily introduce additional electromagnetic interference and common-mode noise, increasing the probability of short circuits, open circuits or misconnections in the external wiring, thus reducing the filtering performance and reliability of the active filter. Utility Model Content

[0005] The purpose of this application is to provide a filtering device, integrated chip, electronic device and vehicle, which aims to improve the filtering performance and safety reliability of the filtering device, and reduce wiring cost and wiring complexity.

[0006] In a first aspect, a filtering device is provided, comprising: a first terminal and a second terminal. The first terminal is used to couple a first pole of a power supply to a first pole of a load. The second terminal is used to couple a second pole of a power supply to a second pole of a load. The filtering device is configured to filter an electrical signal input from the first terminal and / or the second terminal, and then output the filtered electrical signal to the load from the first terminal and / or the second terminal.

[0007] The technical solution provided in this application enables the input of electrical signals and the output of filtered electrical signals through the same signal line via the first and / or second ends of the filtering device. The first end of the filtering device is coupled to the first pole of the power supply, and the second end is coupled to the second pole of the power supply. While meeting the power supply requirements of the filtering device, the first and / or second ends are reused to transmit electrical signals, eliminating the need for additional signal lines or power supply lines. This simplifies the external wiring of the filtering device, thereby reducing the wiring cost and complexity of the filtering device, reducing the risk of line faults, and reducing the introduction of electromagnetic interference and common-mode noise, thus improving the filtering performance of the filtering device.

[0008] In one embodiment, the filtering device provided in this application further includes a transformer circuit and a filtering circuit. The first terminal of the transformer circuit, serving as the first terminal of the filtering device, is configured to adjust the first voltage input to the first terminal of the transformer circuit to a second voltage, and output the second voltage from the second terminal of the transformer circuit, wherein the first voltage is greater than the second voltage. The first terminal of the filtering circuit is coupled to the second terminal of the transformer circuit to draw power through the second terminal of the transformer circuit. The second terminal of the filtering circuit is used to couple to the first terminal of the filtering device, and / or the second terminal of the filtering device. The filtering circuit is configured to filter the electrical signal input to the second terminal of the filtering circuit. The above technical solution adjusts the first voltage input to the filtering device to the second voltage through the transformer circuit. When the power supply is a high-voltage power supply, the filtering device can draw power from the high-voltage power supply nearby, without needing to connect to a low-voltage power supply over a long distance. This avoids the introduction of parasitic parameters due to excessively long power supply lines, improves the stability of the power supply voltage to the filtering device, and the nearby power supply wiring also improves the convenience of engineering practice. Furthermore, integrating power supply and filtering functions reduces the size and facilitates modular production and application.

[0009] In one embodiment, the filter circuit is further configured to output the filtered electrical signal from its second terminal. By receiving and outputting electrical signals through a single terminal, the filter circuit simplifies the internal circuit layout of the filtering device, while reducing parasitic effects and improving the filtering performance of the filter circuit.

[0010] In one embodiment, the filtering device provided in this application further includes a control circuit, the first terminal of which is coupled to the third terminal of the transformer circuit and configured to control the magnitude of the output voltage at the second terminal of the transformer circuit. The above technical solution, by flexibly controlling the magnitude of the output voltage at the second terminal of the transformer circuit through the control circuit, achieves adjustment of the power supply voltage to the filtering circuit, broadens the selection range of the power supply voltage, effectively meets the filtering power level requirements of the filtering circuit, and improves the performance and applicability of the filtering circuit.

[0011] In one embodiment, the filtering device provided in this application further includes: a voltage regulating switch, the first terminal of which is coupled to the first terminal of a control circuit, the second terminal of which is coupled to the third terminal of a transformer circuit, and the third terminal of which is coupled to the second terminal of the filtering device. The control circuit is configured to control the magnitude of the output voltage at the second terminal of the transformer circuit by adjusting the duty cycle of the voltage regulating switch. The above technical solution, by adjusting the duty cycle of the voltage regulating switch to control the magnitude of the output voltage at the second terminal of the transformer circuit, has a fast response speed, low heat loss, and can achieve continuous output from zero to the maximum value within the output voltage range, resulting in stronger output voltage stability.

[0012] In one embodiment, the transformer circuit includes a first inductor and a second inductor. A first end of the first inductor serves as the first terminal of the transformer circuit, and a second end of the first inductor serves as the third terminal of the transformer circuit. A first end of the second inductor is coupled to a second terminal of the transformer circuit, and a second end of the second inductor is coupled to a ground terminal. In this technical solution, the first and second inductors are isolated, reducing common-mode noise and preventing high-voltage side faults from directly affecting the low-voltage side, thus improving the safety of the step-down voltage. Furthermore, a single magnetic core can be wound with multiple coils to achieve multiple outputs of different voltages, adapting to a wider range of voltage requirements.

[0013] In one embodiment, the transformer circuit further includes: a first voltage regulator circuit, wherein a first terminal of the first voltage regulator circuit is coupled to a first terminal of the second inductor coil, a second terminal of the first voltage regulator circuit is coupled to a second terminal of the transformer circuit, and a third terminal of the first voltage regulator circuit is coupled to a ground terminal. The above technical solution stabilizes the second voltage output by the transformer circuit through the first voltage regulator circuit, thereby improving the power supply quality to the filter circuit and enhancing circuit stability.

[0014] In one embodiment, the first voltage regulator circuit includes a first diode and a first capacitor. The anode of the first diode serves as the first terminal of the first voltage regulator circuit, and the cathode of the first diode serves as the second terminal of the first voltage regulator circuit. The first terminal of the first capacitor is coupled to the second terminal of the transformer circuit, and the second terminal of the first capacitor serves as the third terminal of the first voltage regulator circuit. This technical solution protects the transformer circuit with the first diode and stabilizes the output voltage with the first capacitor, offering simplicity, reliability, and reduced circuit cost.

[0015] In one embodiment, the transformer circuit further includes a third inductor, a first end of which is coupled to a second end of the control circuit so that the control circuit draws power from the first end of the third inductor, and the second end of the third inductor is coupled to a second end of the filter device. This technical solution powers the control circuit using the voltage output from the third inductor, eliminating the need for an additional power supply for the control circuit, further simplifying the circuit and reducing wiring costs.

[0016] In one embodiment, the first end of the third inductor is also used to couple to the third end of the control circuit, so that the control circuit controls the magnitude of the output voltage at the second end of the transformer circuit based on the electrical signal input at the third end of the control circuit. The above technical solution, through the electrical signal input at the third end of the control circuit, feeds back to control the magnitude of the output voltage at the first end of the third inductor. The third and second inductors are simultaneously coupled to the first inductor, thereby achieving indirect control of the output voltage at the second end of the transformer circuit.

[0017] In one embodiment, the transformer circuit further includes a second voltage regulator circuit. The first terminal of the second voltage regulator circuit is coupled to the first terminal of the third inductor coil, the second terminal of the second voltage regulator circuit is coupled to the second and third terminals of the control circuit, and the third terminal of the second voltage regulator circuit is coupled to the second terminal of the filter device. This technical solution stabilizes the voltage output from the transformer circuit to the control circuit through the second voltage regulator circuit, improving the power supply quality and feedback signal quality to the control circuit, thereby enhancing the circuit's stability and the accuracy of voltage control.

[0018] In one embodiment, the second voltage regulator circuit includes a second diode, a third diode, and a second capacitor. The anode of the second diode serves as the first terminal of the second voltage regulator circuit, and the cathode of the second diode is coupled to the second terminal of the second voltage regulator circuit. The anode of the third diode is coupled to the cathode of the second diode, and the cathode of the third diode serves as the second terminal of the second voltage regulator circuit.

[0019] The first terminal of the second capacitor is coupled to the cathode of the second diode, and the second terminal of the second capacitor serves as the third terminal of the second voltage regulator circuit. This technical solution prevents reverse voltage through the second and third diodes, reduces the output voltage of the third inductor by utilizing the forward voltage drop, and simultaneously absorbs high-frequency noise between the two diodes, briefly maintaining voltage stability during load changes.

[0020] In one embodiment, the transformer circuit further includes a freewheeling circuit, a first terminal of which is coupled to a first terminal of a first inductor, and a second terminal of which is coupled to a second terminal of the first inductor. The freewheeling circuit is configured such that when the voltage regulator switch is in the off state, the first inductor and the freewheeling circuit form a loop. This technical solution provides a release path for the transformer circuit through the freewheeling circuit, releasing stored energy to prevent voltage surges, and simultaneously preventing the voltage regulator switch from generating back electromotive force and breaking down when it is turned off.

[0021] In one embodiment, the freewheeling circuit includes a fourth diode, a first resistor, and a third capacitor. The anode of the fourth diode serves as the second terminal of the freewheeling circuit. The first terminal of the first resistor is coupled to the cathode of the fourth diode, and the second terminal of the first resistor is coupled to the first terminal of the freewheeling circuit. The third capacitor and the first resistor are connected in parallel, and the first common terminal of the third capacitor and the first resistor is coupled to the cathode of the fourth diode. The second common terminal of the third capacitor and the first resistor serves as the first terminal of the freewheeling circuit. In this technical solution, the leakage inductance energy generated when the voltage regulator switch is turned off is transferred to the third capacitor through the fourth diode to charge the third capacitor, preventing the leakage inductance energy from flowing back and damaging the transformer circuit. Furthermore, when the voltage regulator switch is turned on, the third capacitor discharges through the first resistor, consuming the absorbed energy and releasing stored energy to prevent voltage surges.

[0022] In one embodiment, the voltage regulator switch is a metal-oxide-semiconductor field-effect transistor (MOSFET). The gate of the MOSFET serves as the first terminal of the voltage regulator switch, the drain of the MOSFET serves as the second terminal, and the source of the MOSFET serves as the third terminal. MOSFETs have fast response speeds and low losses, enabling efficient and precise voltage control.

[0023] In one embodiment, the filtering device provided in this application further includes a voltage divider circuit. A first terminal of the voltage divider circuit is coupled to a first terminal of the filtering device, a second terminal of the voltage divider circuit is coupled to a second terminal of the control circuit, and a third terminal of the voltage divider circuit is coupled to the second terminal of the filtering device. The voltage divider circuit is configured to use the voltages divided from the first and second terminals of the filtering device at its second and third terminals as input voltages to the second and fourth terminals of the control circuit. The fourth terminal of the control circuit is coupled to the second terminal of the filtering device. This technical solution divides the voltage received from the power supply by the filtering device through the voltage divider circuit, providing a startup voltage for the control circuit when the third inductor coil is not outputting voltage, thus ensuring the normal operation of the control circuit.

[0024] In one embodiment, the voltage divider circuit includes a voltage divider resistor and a voltage regulator circuit. The first terminal of the voltage divider resistor serves as the first terminal of the voltage divider circuit. The first terminal of the voltage regulator circuit is coupled to the second terminal of the voltage divider resistor, the common terminal of the voltage regulator circuit and the voltage divider resistor serves as the second terminal of the voltage divider circuit, and the second terminal of the voltage regulator circuit serves as the third terminal of the voltage divider circuit. This technical solution provides a suitable voltage to the control circuit through the voltage divider circuit, while simultaneously stabilizing the supply voltage through the voltage regulator circuit, ensuring the safe and stable supply of power to the control circuit.

[0025] In one embodiment, the voltage regulator circuit includes a Zener diode and a Zener capacitor. The Zener capacitor and the Zener diode are connected in parallel, and the first common terminal and the second common terminal of the Zener capacitor and the Zener diode serve as the first terminal and the second terminal of the voltage regulator circuit, respectively. This technical solution, while achieving voltage regulation through the Zener capacitor, also prevents circuit breakdown through the Zener diode, thus improving the safety of powering the control circuit.

[0026] Secondly, an integrated chip is also provided, which includes the filtering device described in the first aspect and any implementation thereof.

[0027] Thirdly, an electronic device is provided, including a power supply, a load, and a filtering device as described in the first aspect and any implementation thereof, or including a power supply, a load, and an integrated chip as described in the second aspect.

[0028] Fourthly, a vehicle is provided, comprising a vehicle body and the filtering device described in the first aspect and any implementation thereof, or comprising a vehicle body and the integrated chip described in the second aspect, or comprising a vehicle body and the electronic device described in the third aspect. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the wiring structure of a filtering device provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the power supply wiring of a filter device provided in an embodiment of this application;

[0033] Figure 4 A schematic diagram of the power supply wiring of another filtering device provided in an embodiment of this application;

[0034] Figure 5 A schematic diagram of the power supply wiring of another filtering device provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the circuit structure of a filtering device provided in an embodiment of this application;

[0036] Figure 7 A schematic diagram of the circuit structure of a transformer circuit provided in an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the circuit structure of a motor controller provided in an embodiment of this application.

[0038] Figure label:

[0039] 100. Power supply;

[0040] 200. Load;

[0041] 300. Integrated chips;

[0042] 30. First end; 31. Second end; 32. Third end;

[0043] 33. Transformer circuit;

[0044] 33a, First inductor; 33b, Second inductor; 33c, Third inductor;

[0045] D3, first diode; C3, first capacitor; D4, second diode; D5, third diode; C4, second capacitor;

[0046] 34. Filtering circuit;

[0047] 35. Control circuit;

[0048] 36. Voltage regulating switch;

[0049] 37. Voltage divider circuit;

[0050] RV, voltage divider resistor; DV, Zener diode; CV, Zener capacitor;

[0051] 38. Freewheeling circuit;

[0052] D2, fourth diode; R1, first resistor; C1, third capacitor. Detailed Implementation

[0053] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0054] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0055] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0056] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0057] This application provides a vehicle, also known as a vehicle, mobile carrier, etc., including but not limited to sedans, sport utility vehicles (SUVs), trucks, electric vehicles, motorcycles, tricycles, driverless taxis, intelligent connected buses, autonomous logistics vehicles, electric trucks, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, special vehicles (such as ambulances, fire trucks, police cars, etc.), agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, etc., and this application does not impose specific limitations on them.

[0058] In some embodiments, the vehicle includes a vehicle body and electronic devices, with the electronic devices disposed within the vehicle body.

[0059] Optionally, the electronic equipment may be applied to vehicle electric drive systems, power systems, body electronic systems, etc., and this application does not impose specific restrictions on this.

[0060] Please see Figure 1 , Figure 1 This is a schematic diagram of an electronic device provided in an embodiment of this application. The electronic device includes a power supply 100, a load 200, and an integrated chip 300. The power supply 100 is coupled to the load 200 and is used to provide power to the load 200. The integrated chip 300 is coupled to the power supply 100 and / or the load 200 and is used to suppress noise in the power supply 100 and / or the load 200.

[0061] Optionally, the integrated chip 300 includes an independent filter chip, a chip integrated into a power management IC, a chip integrated into a communication interface, etc. The power supply 100 includes a battery, a switching power supply, and an AC power supply, etc. The load 200 includes radio frequency circuits, communication circuits, frequency devices, and motors, etc. This application does not impose specific limitations in this regard.

[0062] In some embodiments, the integrated chip 300 is an active filter chip. An active filter chip is an integrated chip that dynamically suppresses noise or specific frequency signals through active electronic components (such as operational amplifiers and transistors) and feedback circuits. Specifically, it detects the input signal / noise and generates a reverse signal in real time to cancel noise interference (such as an electromagnetic interference (EMI) filter chip).

[0063] Optionally, the active filter chip includes active low-pass filters, active high-pass filters, active EMI filters, and active audio filters, etc.

[0064] Since active filter chips need to detect input signals / noise and generate reverse signals in real time, they typically have four external connections. These four external connections are used for positive power input, ground, signal / noise input, and reverse signal output, respectively.

[0065] In some embodiments, the integrated chip 300 includes a filtering device.

[0066] To avoid problems such as complex wiring, increased costs, and difficult troubleshooting caused by excessive external wiring, this application provides a filtering device that simplifies external wiring. The specific structure of the filtering device is described in detail below.

[0067] For example, please refer to Figure 2 , Figure 2This is a schematic diagram of the wiring structure of a filtering device provided in an embodiment of this application. The filtering device 301 includes a first terminal 30, a second terminal 31, and a third terminal 32. The first terminal 30 is used to couple the first pole of the power supply to the first pole of the load. The second terminal 31 is used to couple the second pole of the power supply to the second pole of the load. The third terminal 32 is used to couple to the ground terminal.

[0068] Optionally, the filtering device 301 is configured to: filter the electrical signals input from the first terminal 30 and the second terminal 31, and then output the filtered electrical signals to the power supply / load from the first terminal 30 and the second terminal 31. Alternatively, it can filter the electrical signals input from the first terminal 30 and then output the filtered electrical signals to the power supply / load from the first terminal 30. Alternatively, it can filter the electrical signals input from the second terminal 31 and then output the filtered electrical signals to the power supply / load from the second terminal 31.

[0069] The electrical signal input to the filter device 301 refers to a signal that includes noise, harmonics, or other interference components. For example, high-frequency ripple, switching noise, etc.

[0070] A filtered electrical signal refers to a signal that has undergone processing such as filtering and eliminating noise, harmonics, or other interference components. For example, a compensation current generated based on noise in an electrical signal. The compensation current is a current signal generated to cancel noise or interference; it is achieved by injecting a current with the same amplitude but opposite phase to the detected noise or interference, thus canceling noise or correcting errors.

[0071] Depend on Figure 2 It can be seen that the electrical signal input to the filter device 301 and the filtered electrical signal are transmitted through the first terminal 30 and / or the second terminal 31. The filter device only requires 3 external wirings, which reduces the wiring cost and wiring complexity of the filter device 301 and reduces the risk of external line failure.

[0072] In some embodiments, the power supply is a high-voltage power supply configured to supply power to the filtering device. For example, the first terminal of the power supply is positive, the second terminal is negative, and the first terminal of the filtering device is connected to the positive terminal to draw power.

[0073] High-voltage power supplies are devices or nodes capable of providing high-voltage electrical energy, and their output voltage is typically above 100V. Optionally, high-voltage power supplies include high-voltage transformers, high-voltage distribution equipment, high-voltage busbars, etc.

[0074] To reduce power consumption and interference, the filter device 301 is typically powered by a low-voltage power supply. When detecting and canceling noise signals from the high-voltage power supply through the filter device 301 (e.g., when the filter device 301 is near a high-voltage bus), the filter device 301 requires a relatively long external trace to connect to the low-voltage power supply. Figure 3 , Figure 4As shown, there is a certain distance between the filter device 301 and the drive board 302. Since the filter device 301 requires a low-voltage power supply relative to ground, it needs to be connected to the low-voltage power supply on the drive board 302 over a long distance via an external wiring 303. Because the external wiring 303 itself has certain impedance parasitic parameters, supplying power through the external wiring 303 will affect the stability of the power supply voltage to the filter device 301, increase the noise of the power supply voltage transmitted to the filter device 301, thereby weakening the filtering effect of the filter device 301 or even increasing additional noise. Figure 5 As shown, when power is supplied remotely via external wiring 303, the positional relationship between the filter device 301 and the drive board 302 may lead to bending, torque, and other wiring conditions, further introducing impedance parasitic parameters, reducing the stability of the power supply voltage to the filter device 301, and increasing the risk of line faults. Furthermore, remote power supply via external wiring 303 is not conducive to high integration, and the low-voltage power supply of the drive board 302 limits the flexibility of adjusting the voltage amplitude, restricting the choice of voltage level. An excessively low voltage is not conducive to improving the filtering power rating of the filter device.

[0075] Based on the above problems, this application provides a filtering device that is directly powered by a high-voltage power supply.

[0076] For example, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the circuit structure of a filtering device provided in an embodiment of this application. The filtering device includes a transformer circuit 33 and a filter circuit 34. The first terminal of the transformer circuit 33 serves as the first terminal 30 of the filter device. The first terminal of the filter circuit 34 is coupled to the second terminal of the transformer circuit 33 to draw power through the second terminal of the transformer circuit 33. The second terminal of the filter circuit 34 is used to couple the first terminal 30 and / or the second terminal 31 of the filter device.

[0077] The transformer circuit 33 is configured to adjust the first voltage at the first terminal of the input transformer circuit 33 to a second voltage, and output the second voltage from the second terminal of the transformer circuit 33. Since the first voltage is greater than the second voltage, the transformer circuit 33 adjusts the first voltage output from the high-voltage power supply to the second voltage to power the filter circuit 34.

[0078] Optionally, the transformer circuit 33 includes a non-isolated direct current to direct current (DC-DC) converter circuit, an isolated DC-DC converter circuit, etc.

[0079] The filter circuit 34 is configured to filter the electrical signal at the second terminal of the input filter circuit 34 and output the filtered electrical signal from the second terminal of the filter circuit 34.

[0080] For example, the second terminal of the filter circuit 34 receives the noise signal and outputs a compensation current generated based on the noise signal.

[0081] Optionally, such as Figure 6 As shown, the second terminal of the filter circuit 34 is coupled to the first terminal 30 of the filter device, and the first terminal 30 of the filter device detects the noise signal and outputs a compensation current. Alternatively, the second terminal of the filter circuit 34 is coupled to the second terminal 31 of the filter device, and the second terminal 31 of the filter device detects the noise signal and outputs a compensation current. Alternatively, the second terminal of the filter circuit 34 is simultaneously coupled to both the first terminal 30 and the second terminal 31 of the filter device, and the first terminal 30 and the second terminal 31 of the filter device detect the noise signal and output a compensation current.

[0082] The second end of the filter circuit 34 can be the same port, or it can be two ports that are respectively connected to the first end 30 and the second end 31.

[0083] Specifically, to avoid conflicts and interference caused by the transmission of noise signals and compensation current through the same port / signal line in the filter circuit 34, the noise signal received at the second terminal of the filter circuit 34 is a voltage signal, which is isolated from the compensation current by a capacitor. For example, the noise signal is input to the filter circuit 34 through a capacitor connected in series with the second terminal of the filter circuit 34. When the input impedance of the filter circuit 34 is higher than the power supply impedance, the DC signal is blocked. When the output impedance of the filter circuit 34 is lower than the load, the capacitor has minimal resistance to the compensation current, thus achieving the output of the compensation current.

[0084] In some embodiments, such as Figure 7 As shown, the transformer circuit includes a first inductor 33a and a second inductor 33b. The first end of the first inductor 33a serves as the first terminal of the transformer circuit, and the second end of the first inductor 33a serves as the third terminal of the transformer circuit. The first end of the second inductor 33b is coupled to the second terminal of the transformer circuit, and the second end of the second inductor 33b is coupled to the ground terminal.

[0085] In this circuit, the first inductor 33a and the second inductor 33b are coupled through a magnetic core. The first terminal of the first inductor 33a receives a first voltage output from the high-voltage power supply, and the first terminal of the second inductor 33b outputs a second voltage to the filter circuit 34. The voltage ratio of the first voltage to the second voltage is determined by the turns ratio of the first inductor 33a and the second inductor 33b, as expressed by the following formula:

[0086]

[0087] Wherein, V1 represents the first voltage, V2 represents the second voltage, N1 represents the number of turns of the first inductor 33a, and N2 represents the number of turns of the second inductor 33b.

[0088] In some embodiments, in order to suppress noise in the transformer circuit and improve the stability of the output second voltage, the transformer circuit further includes a first voltage regulator circuit. The first terminal of the first voltage regulator circuit is coupled to the first terminal of the second inductor 33b, the second terminal of the first voltage regulator circuit is coupled to the second terminal of the transformer circuit, and the third terminal of the first voltage regulator circuit is coupled to the ground terminal.

[0089] Optionally, the first voltage regulator circuit includes a switching voltage regulator circuit, a Zener diode voltage regulator circuit, a resistor-capacitor filter voltage regulator circuit, etc.

[0090] For example, such as Figure 7 As shown, the first voltage regulator circuit includes a first diode D3 and a first capacitor C3. The anode of the first diode D3 serves as the first terminal of the first voltage regulator circuit, and the cathode of the first diode D3 serves as the second terminal of the first voltage regulator circuit. The first terminal of the first capacitor C3 is coupled to the second terminal of the transformer circuit, and the second terminal of the first capacitor C3 serves as the third terminal of the first voltage regulator circuit.

[0091] The first diode D3 is used to prevent the output second voltage from affecting the transformer circuit in reverse, such as the reverse current generated when the filter circuit 34 is suddenly unloaded. The first capacitor C3 is used to smooth the output voltage and reduce voltage output fluctuations.

[0092] In some embodiments, the first diode D3 is a freewheeling diode, used to achieve rectification and freewheeling functions.

[0093] Since the low-voltage power supply in the electronic control is usually a fixed 12V or lower, and the filtering device may have better filtering performance when powered by 30V, without adding a boost module, only 12V can be selected to power the filtering device, which limits the performance of the filtering device. Therefore, in order to adjust the magnitude of the second voltage to adapt to the different filtering level requirements of the filtering module and improve the performance of the filtering device, the filtering device provided in this application embodiment also includes a control circuit 35. The first terminal of the control circuit 35 is coupled to the third terminal of the transformer circuit, and the control circuit 35 is configured to control the magnitude of the output voltage at the second terminal of the transformer circuit.

[0094] Optionally, the control circuit 35 includes a pulse width modulation (PWM) controller, a digital power controller, a resonant controller, etc.

[0095] For example, the filtering device includes a voltage regulating switch 36, a first terminal of which is coupled to a first terminal of a control circuit 35, a second terminal of which is coupled to a third terminal of a transformer circuit, and a third terminal of which is coupled to a second terminal of the filtering device. The control circuit 35 is configured to control the magnitude of the output voltage at the second terminal of the transformer circuit by adjusting the duty cycle of the voltage regulating switch 36.

[0096] The duty cycle refers to the ratio of the on-time of the voltage regulating switch 36 within one cycle to the total cycle time. For example, the relationship between the second voltage and the duty cycle can be expressed by the following formula:

[0097]

[0098] Wherein, V1 represents the first voltage, V2 represents the second voltage, N1 represents the number of turns of the first inductor 33a, N2 represents the number of turns of the second inductor 33b, and D represents the duty cycle of the voltage regulating switch 36.

[0099] Optionally, the voltage regulating switch 36 includes a MOSFET, an insulated gate bipolar transistor (IGBT), a synchronous rectifier, and a silicon carbide MOSFET, etc.

[0100] For example, the voltage regulator 36 is an N-channel metal-oxide-semiconductor field-effect transistor (NMOS), with the gate of the NMOS serving as the first terminal of the voltage regulator 36, the drain of the MOSFET serving as the second terminal of the voltage regulator 36, and the source of the NMOS serving as the third terminal of the voltage regulator 36.

[0101] In some embodiments, the control circuit 35 acquires a second voltage and controls the duty cycle of the voltage regulating switch 36 based on the deviation between the second voltage and a preset voltage value, thereby adjusting the second voltage to the preset voltage value.

[0102] For example, a second voltage is acquired through a feedback network, and an error signal between the acquired second voltage and a preset voltage value is output. The error signal is compared with a sawtooth wave (or triangular wave) signal through a PWM comparator, thereby generating a PWM pulse to control the duty cycle.

[0103] In some embodiments, to prevent the control circuit 35 from being damaged when directly powered by the power supply 100, the transformer circuit further includes a third inductor 33c. The first end of the third inductor 33c is used to couple to the second end of the control circuit 35 so that the control circuit 35 draws power from the first end of the third inductor 33c, and the second end of the third inductor 33c is used to couple to the second end 31 of the filter device.

[0104] The third inductor 33c and the first inductor 33a are coupled through a magnetic core, and the first terminal of the third inductor 33c outputs a third voltage V3 to the control circuit 35. The voltage ratio of the first voltage to the third voltage V3 is determined by the turns ratio of the first inductor 33a and the third inductor 33c and the duty cycle of the voltage regulating switch 36, and is expressed by the following formula:

[0105]

[0106] Where V1 represents the first voltage, V3 represents the third voltage, N1 represents the number of turns of the first inductor 33a, N3 represents the number of turns of the third inductor 33c, and D represents the duty cycle of the voltage regulating switch.

[0107] In some embodiments, the second voltage is referenced to a high potential point (such as the positive terminal of the power supply), and the third voltage V3 is referenced to a low potential point (such as the negative terminal of the power supply). It is not convenient to directly control the second voltage through feedback. Therefore, the second voltage is indirectly controlled by collecting the third voltage V3 for feedback adjustment.

[0108] For example, the first end of the third inductor 33c is coupled to the third end of the control circuit 35, so that the control circuit 35 controls the magnitude of the output voltage at the second end of the transformer circuit based on the electrical signal input at the third end of the control circuit 35. For example, the control circuit 35 controls the duty cycle of the voltage regulating switch 36 based on the PWM signal output by the third voltage, thereby controlling the magnitude of the second voltage.

[0109] In some embodiments, the transformer circuit further includes a second voltage regulator circuit. The first terminal of the second voltage regulator circuit is coupled to the first terminal of the third inductor 33c, the second terminal of the second voltage regulator circuit is coupled to the second and third terminals of the control circuit 35, and the third terminal of the second voltage regulator circuit is coupled to the second terminal 31 of the filter device.

[0110] For example, the second voltage regulator circuit includes: a second diode D4, a third diode D5, and a second capacitor C4. The anode of the second diode D4 serves as the first terminal of the second voltage regulator circuit, and the cathode of the second diode D4 is coupled to the second terminal of the second voltage regulator circuit. The anode of the third diode D5 is coupled to the cathode of the second diode, and the cathode of the third diode D5 serves as the second terminal of the second voltage regulator circuit. The first terminal of the second capacitor C4 is coupled to the cathode of the second diode D4, and the second terminal of the second capacitor C4 serves as the third terminal of the second voltage regulator circuit.

[0111] The second diode D4 and the third diode D5 are used to prevent reverse voltage and to reduce the output voltage of the third inductor 33c by utilizing the forward voltage drop. The second capacitor C4 is used to absorb high-frequency noise between the two diodes and store charge to maintain voltage stability briefly when the load changes.

[0112] In some embodiments, the filtering device further includes a voltage divider circuit 37. A first terminal of the voltage divider circuit 37 is coupled to a first terminal of the filtering device, a second terminal of the voltage divider circuit 37 is coupled to a second terminal of the control circuit 35, and a third terminal of the voltage divider circuit 37 is coupled to a second terminal of the filtering device.

[0113] The voltage divider circuit 37 is configured to use the voltages obtained from the first terminal 30 and the second terminal 31 of the filter device at its second and third terminals as the input voltages to the second and fourth terminals of the control circuit 35. The fourth terminal of the control circuit 35 is coupled to the second terminal 31 of the filter device. In other words, the voltages (such as the power supply output voltage) obtained from the first terminal 30 and the second terminal 31 of the filter device are proportionally divided and reduced. The divided voltage is used as the start-up voltage of the control circuit 35, supplying power to the control circuit 35 when the transformer circuit is not outputting the third voltage.

[0114] Optionally, the voltage divider circuit includes a resistor voltage divider circuit, a capacitor voltage divider circuit, a resistor-capacitor voltage divider circuit, and an active voltage divider circuit.

[0115] For example, the voltage divider circuit 37 includes a voltage divider resistor RV and a voltage regulator circuit. The first terminal of the voltage divider resistor RV serves as the first terminal of the voltage divider circuit 37. The first terminal of the voltage regulator circuit is coupled to the second terminal of the voltage divider resistor RV, the common terminal of the voltage regulator circuit and the voltage divider resistor RV serves as the second terminal of the voltage divider circuit 37, and the second terminal of the voltage regulator circuit serves as the third terminal of the voltage divider circuit 37.

[0116] Among them, the voltage divider resistor RV is used for voltage division, and the voltage output from the common terminal of the voltage divider resistor RV and the voltage regulator circuit supplies power to the control circuit 35.

[0117] The voltage regulator circuit is used to stabilize the voltage output of the voltage divider resistor RV and the common terminal of the voltage regulator circuit.

[0118] For example, the voltage regulator circuit includes a Zener diode DV and a Zener capacitor CV. The Zener capacitor CV is connected in parallel with the Zener diode DV, and the first common terminal and the second common terminal of the Zener capacitor CV and the Zener diode DV serve as the first terminal and the second terminal of the voltage regulator circuit, respectively.

[0119] The Zener diode DV is used to clamp the voltage output from the common terminal of the voltage divider resistor RV and the voltage regulator circuit to a fixed value, so as to output a stable voltage to the control circuit 35.

[0120] The voltage regulator capacitor CV is used to smooth the output voltage, reduce high-frequency noise, and absorb transient interference energy.

[0121] In some embodiments, the first end of the voltage regulator circuit is coupled to the first end of the third inductor coil 33c, thereby coupling the first end of the third inductor coil 33c to the second end of the control circuit 35. When the control circuit 35 is powered by the third voltage, the third voltage is stabilized by the voltage regulator circuit.

[0122] In some embodiments, the transformer circuit further includes a freewheeling circuit 38. A first terminal of the freewheeling circuit 38 is coupled to a first terminal of the first inductor 33a, and a second terminal of the freewheeling circuit 38 is coupled to a second terminal of the first inductor 33a.

[0123] The freewheeling circuit 38 is configured such that when the voltage regulating switch 36 is in the off state, the first inductor coil 33a forms a loop with the freewheeling circuit.

[0124] The freewheeling circuit 38 is a circuit that provides a release path for the energy stored in the inductive load or the transformer's own inductance (such as magnetizing inductance or leakage inductance) during the operation of the transformer circuit. It is used to release stored energy, prevent voltage surges, and avoid breakdown due to back electromotive force generated by the inductive load when the voltage regulator switch 36 is turned off. For example, when the voltage regulator switch 36 of the transformer circuit is turned off, to prevent sudden current surges, the freewheeling circuit 38 is needed to maintain current continuity and avoid high-voltage spikes that could damage the circuit.

[0125] For example, the freewheeling circuit 38 includes a fourth diode D2, a first resistor R1, and a third capacitor C1. The anode of the fourth diode D2 serves as the second terminal of the freewheeling circuit. The first terminal of the first resistor R1 is coupled to the cathode of the fourth diode D2, and the second terminal of the first resistor R1 is coupled to the first terminal of the freewheeling circuit 38. The third capacitor C1 is connected in parallel with the first resistor R1, and the first common terminal of the third capacitor C1 and the first resistor R1 is coupled to the cathode of the fourth diode D2. The second common terminal of the third capacitor C1 and the first resistor R1 serves as the first terminal of the freewheeling circuit 38.

[0126] The fourth diode D2 is used to transfer the leakage inductance energy generated when the voltage regulating switch 36 is turned off to the third capacitor C1, charging the third capacitor C1 and preventing the leakage inductance energy from flowing back and damaging the transformer circuit. When the voltage regulating switch 36 is turned on, the third capacitor C1 discharges through the first resistor R1, consuming the absorbed energy.

[0127] The filtering devices and integrated chips provided in this application can be applied to various fields requiring filtering. Taking the integrated filtering of a motor controller as an example, a motor controller is an electronic device used to control the operation of a motor (such as speed, torque, direction, etc.). Figure 8 The diagram shown is a schematic diagram of the circuit structure of a motor controller provided in an embodiment of this application.

[0128] The motor controller includes a power supply 100, an integrated chip 300, and a switching circuit. The first terminal of the integrated chip 300 is coupled to the first terminal of the power supply 100 and the first terminal of the switching circuit, and the second terminal of the integrated chip 300 is coupled to the second terminal of the power supply 100 and the second terminal of the switching circuit. The switching circuit includes a first branch, a second branch, and a third branch connected in parallel. The first common terminal of the first, second, and third branches serves as the first terminal of the switching circuit, and the second common terminal of the first, second, and third branches serves as the second terminal of the switching circuit. The first branch includes a first switch Q1 and a second switch Q2 connected in series; the second branch includes a third switch Q3 and a fourth switch Q4 connected in series; and the third branch includes a fifth switch Q5 and a sixth switch Q6 connected in series. The switching circuit also includes a first inductor La, a second inductor Lb, and a third inductor Lc. The first terminal of the first inductor La and the first terminal of the third inductor Lc are connected together. The second terminal of the first inductor La is coupled to the common terminal of the first switch Q1 and the second switch Q2. The second terminal of the second inductor Lb is coupled to the common terminal of the third switch Q3 and the fourth switch Q4. The second terminal of the third inductor Lc is coupled to the common terminal of the fifth switch Q5 and the sixth switch Q6.

[0129] The power supply 100 provides electrical energy to the motor controller. The switching circuit controls the current flow, regulates the motor voltage or current, and is also used for energy storage, filtering, and limiting the rate of change of current.

[0130] Integrated chip 300 is used for filtering, specifically detecting circuit noise signals and outputting compensation current based on the noise signals. Integrated chip 300 is connected to power supply 100, drawing power from the nearest source while performing filtering. Furthermore, the low-voltage ground of integrated chip 300 is taken from the chassis ground nearby, eliminating the need for external wiring to connect to components other than integrated chip 300. Figure 8 As can be seen, the wiring of the integrated chip 300 is similar to that of the Y capacitor. However, the effective frequency band of the Y capacitor is usually around 10MHz, and it has leakage current problems and its capacitance value is limited. The integrated chip 300 in this embodiment can filter out low-frequency noise within 3MHz through its internal filtering device, and it does not have leakage current problems. It has a larger filtering range and a higher level of safety.

[0131] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0132] The above are merely specific embodiments 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.

Claims

1. A filtering device, characterized in that, include: The first terminal is used to couple the first pole of the power supply to the first pole of the load. The second terminal is used to couple the second pole of the power supply and the second pole of the load. The filtering device is configured to filter the electrical signal input from the first terminal and / or the second terminal, and then output the filtered electrical signal to the load from the first terminal and / or the second terminal. A transformer circuit, wherein the first terminal of the transformer circuit serves as the first terminal of the filter device; the transformer circuit is configured to: adjust a first voltage input to the first terminal of the transformer circuit to a second voltage, and output the second voltage from the second terminal of the transformer circuit; the first voltage is greater than the second voltage; A filter circuit, wherein a first terminal of the filter circuit is coupled to a second terminal of the transformer circuit to draw power through the second terminal of the transformer circuit; the second terminal of the filter circuit is used to couple to the first terminal of the filter device, and / or the second terminal of the filter device; The filtering circuit is configured to filter the electrical signal input to the second terminal of the filtering circuit; A control circuit, wherein a first terminal of the control circuit is coupled to a third terminal of the transformer circuit, is configured to control the magnitude of the output voltage at a second terminal of the transformer circuit.

2. The filtering device according to claim 1, characterized in that, The filtering circuit is further configured to output a filtered electrical signal from its second terminal.

3. The filtering device according to claim 1, characterized in that, The filtering device further includes: A voltage regulating switch, wherein the first terminal of the voltage regulating switch is coupled to the first terminal of the control circuit, the second terminal of the voltage regulating switch is coupled to the third terminal of the transformer circuit, and the third terminal of the voltage regulating switch is coupled to the second terminal of the filter device; The control circuit is configured to control the magnitude of the output voltage at the second terminal of the transformer circuit by adjusting the duty cycle of the voltage regulating switch.

4. The filtering device according to claim 3, characterized in that, The transformer circuit includes: A first inductor coil, wherein the first end of the first inductor coil serves as the first end of the transformer circuit, and the second end of the first inductor coil serves as the third end of the transformer circuit; The second inductor coil has its first end coupled to the second end of the transformer circuit and its second end coupled to the ground terminal.

5. The filtering device according to claim 4, characterized in that, The transformer circuit also includes: A first voltage regulator circuit, wherein a first terminal of the first voltage regulator circuit is coupled to a first terminal of the second inductor, a second terminal of the first voltage regulator circuit is coupled to a second terminal of the transformer circuit, and a third terminal of the first voltage regulator circuit is coupled to the ground terminal.

6. The filtering device according to claim 5, characterized in that, The first voltage regulator circuit includes: The first diode has its anode serving as the first terminal of the first voltage regulator circuit, and its cathode serving as the second terminal of the first voltage regulator circuit. A first capacitor, the first end of which is coupled to the second end of the transformer circuit, and the second end of which serves as the third end of the first voltage regulator circuit.

7. The filtering device according to claim 4, characterized in that, The transformer circuit also includes: A third inductor coil, wherein a first end of the third inductor coil is used to couple to a second end of the control circuit so that the control circuit draws power from the first end of the third inductor coil, and the second end of the third inductor coil is used to couple to a second end of the filter device.

8. The filtering device according to claim 7, characterized in that, The first end of the third inductor coil is also used to couple to the third end of the control circuit, so that the control circuit controls the magnitude of the output voltage of the second end of the transformer circuit based on the electrical signal input to the third end of the control circuit.

9. The filtering device according to claim 8, characterized in that, The transformer circuit also includes: The second voltage regulator circuit has its first terminal coupled to the first terminal of the third inductor, its second terminal coupled to the second and third terminals of the control circuit, and its third terminal coupled to the second terminal of the filter device.

10. The filtering device according to claim 9, characterized in that, The second voltage regulator circuit includes: The second diode has its anode serving as the first terminal of the second voltage regulator circuit, and its cathode coupled to the second terminal of the second voltage regulator circuit. The anode of the third diode is coupled to the cathode of the second diode, and the cathode of the third diode serves as the second terminal of the second voltage regulator circuit. The second capacitor has its first end coupled to the cathode of the second diode, and its second end serves as the third end of the second voltage regulator circuit.

11. The filtering device according to claim 4, characterized in that, The transformer circuit also includes: A freewheeling circuit, wherein a first end of the freewheeling circuit is coupled to a first end of the first inductor, and a second end of the freewheeling circuit is coupled to a second end of the first inductor; the freewheeling circuit is configured such that when the voltage regulating switch is in the off state, the first inductor and the freewheeling circuit form a loop.

12. The filtering device according to claim 11, characterized in that, The freewheeling circuit includes: The fourth diode, wherein the anode of the fourth diode serves as the second terminal of the freewheeling circuit; A first resistor, the first end of which is coupled to the cathode of the fourth diode, and the second end of which is coupled to the first end of the freewheeling circuit; The third capacitor is connected in parallel with the first resistor. The first common terminal of the third capacitor and the first resistor is coupled to the cathode of the fourth diode. The second common terminal of the third capacitor and the first resistor serves as the first terminal of the freewheeling circuit.

13. The filtering device according to claim 3, characterized in that, The voltage regulator switch is a metal-oxide-semiconductor field-effect transistor (MOSFET). The gate of the MOSFET serves as the first terminal of the voltage regulator switch, the drain of the MOSFET serves as the second terminal of the voltage regulator switch, and the source of the MOSFET serves as the third terminal of the voltage regulator switch.

14. The filtering device according to claim 1, characterized in that, The filtering device further includes: A voltage divider circuit, wherein a first terminal of the voltage divider circuit is coupled to a first terminal of the filter device, a second terminal of the voltage divider circuit is coupled to a second terminal of the control circuit, and a third terminal of the voltage divider circuit is coupled to a second terminal of the filter device; configured to use the voltages divided from the first and second terminals of the filter device at the second and third terminals of the voltage divider circuit as the input voltages at the second and fourth terminals of the control circuit; the fourth terminal of the control circuit is coupled to the second terminal of the filter device.

15. The filtering device according to claim 14, characterized in that, The voltage divider circuit includes: The voltage divider resistor, wherein the first end of the voltage divider resistor serves as the first end of the voltage divider circuit; A voltage regulator circuit, wherein the first terminal of the voltage regulator circuit is coupled to the second terminal of the voltage divider resistor, the common terminal of the voltage regulator circuit and the voltage divider resistor serves as the second terminal of the voltage divider circuit, and the second terminal of the voltage regulator circuit serves as the third terminal of the voltage divider circuit.

16. The filtering device according to claim 15, characterized in that, The voltage regulator circuit includes: Zener diode; A voltage-regulating capacitor is connected in parallel with a voltage-regulating diode. The first common terminal and the second common terminal of the voltage-regulating capacitor and the voltage-regulating diode serve as the first terminal and the second terminal of the voltage-regulating circuit, respectively.

17. An integrated chip, characterized in that, The integrated chip includes a filtering device as described in any one of claims 1 to 16.

18. An electronic device, characterized in that, It includes a power supply, a load, and a filtering device as described in any one of claims 1 to 16, or it includes a power supply, a load, and an integrated chip as described in claim 17.

19. A vehicle, characterized in that, It includes a vehicle body and a filtering device as described in any one of claims 1 to 16, or includes a power supply, a load and an integrated chip as described in claim 17, or includes an electronic device as described in claim 18.

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