Electromagnetic evaluation simulation device for vehicle-mounted charging equipment

Abstract

The utility model discloses an electromagnetic evaluation simulation device for vehicle-mounted charging equipment. The electromagnetic evaluation simulation device comprises a power supply; the input end of the filter circuit is electrically connected with the output end of the power supply; the input end of the first voltage regulating circuit is electrically connected with the output end of the filter circuit; the input end of the main control chip is electrically connected with the output end of the first voltage regulating circuit; the input end of the driving circuit is electrically connected with the output end of the main control chip; the full-bridge circuit is electrically connected with the output end of the driving circuit; the switching circuit is connected with a bridge arm of the full-bridge circuit, the switching circuit comprises a plurality of switches, and one of the plurality of switches is switched on; the transmitting coil comprises a plurality of coils, and the plurality of coils are in one-to-one correspondence with the plurality of switches; the input end of the second voltage regulating circuit is connected with the output end of the filter circuit, and the output end of the second voltage regulating circuit is connected with the full-bridge circuit; the NFC generation circuit is electrically connected with the main control chip, and the NFC generation circuit is in a normally open state.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic testing simulation devices for vehicle-mounted equipment, and more specifically, to an electromagnetic evaluation simulation device for vehicle-mounted charging equipment. Background Technology

[0002] With the development of in-vehicle electrical components, the application of vehicle networking technology and high-power wireless charging for mobile phones, while bringing convenience to vehicle users, the electromagnetic environment inside the vehicle is becoming increasingly complex. Wireless charging currently covers charging power levels of 5W, 15W, 40W, and 80W. As charging power increases, the risk of electromagnetic radiation also increases. ICNRP specifies limits for electromagnetic radiation, using magnetic field probes to complete relevant tests and obtain ratio values ​​of radiation levels.

[0003] The applicant argues that these tests only begin during the vehicle verification phase. If test results exceed standards or fail to meet regulations, the rectification time and pressure will be enormous, leading to higher development and rectification costs and impacting the product's timely installation in vehicles. Therefore, a device is needed that can simulate the radiation performance of a sample in the early stages of vehicle development, enabling early evaluation of the electromagnetic radiation performance of wireless charging devices for mobile phones. This device can be placed in various locations within the vehicle, providing a reference for the component's placement within the overall vehicle. Summary of the Invention

[0004] To address at least one aspect of the aforementioned problems, the present invention provides an electromagnetic evaluation simulation device for vehicle-mounted charging equipment, comprising: a power supply; a filter circuit, the input terminal of which is electrically connected to the output terminal of the power supply; a first voltage regulating circuit, the input terminal of which is electrically connected to the output terminal of the filter circuit; a main control chip, the input terminal of which is electrically connected to the output terminal of the first voltage regulating circuit; a drive circuit, the input terminal of which is electrically connected to the output terminal of the main control chip; a full-bridge circuit, the full-bridge circuit being electrically connected to the output terminal of the drive circuit; a switching circuit, the switching circuit being connected to a bridge arm of the full-bridge circuit, the switching circuit including a plurality of switches, one of which is selectively turned on; a transmitting coil, the transmitting coil including a plurality of coils, the plurality of coils corresponding one-to-one with the plurality of switches; a second voltage regulating circuit, the input terminal of which is connected to the output terminal of the filter circuit, and the output terminal of which is connected to the full-bridge circuit; and an NFC generating circuit, the NFC generating circuit being electrically connected to the main control chip, the NFC generating circuit being normally open.

[0005] Preferably, it further includes a simulated load, which includes a load coil and a load resistor connected in series, and the load coil is disposed at a preset position of the transmitting coil.

[0006] Preferably, the charging coil includes a first coil, a second coil, and a third coil, and the switching switch includes multiple switching interfaces corresponding one-to-one with the coils, and the switching switch selectively turns on one of them.

[0007] Preferably, the first coil and the second coil are arranged parallel to each other, and the third coil is arranged between the first coil and the second coil, and the third coil is arranged perpendicular to the first coil and the second coil.

[0008] Preferably, the full-bridge circuit includes switching transistors Q1 and Q2 forming the first bridge arm, and switching transistors Q3 and Q4 forming the second bridge arm, wherein the midpoint of the first bridge arm and the second bridge arm is electrically connected to the input terminal of the switching circuit.

[0009] Preferably, the driving circuit includes multiple driving sub-circuits, each corresponding one-to-one with a plurality of switching transistors in the full-bridge circuit. Each driving sub-circuit includes a power transistor driving chip circuit, a fault detection circuit, a driving signal receiving circuit, and a protection circuit. The protection circuit is connected to the main control chip and is connected to the power transistor driving chip circuit through the driving signal receiving circuit and the fault detection circuit. The driving signal receiving circuit and the fault detection circuit are electrically connected, and the power transistor driving chip circuit is connected to the switching transistors in the full-bridge circuit.

[0010] Preferably, the first voltage regulation circuit includes a first voltage regulator chip, a first capacitor, and a second capacitor. The input terminal of the voltage regulator chip is connected to the output terminal of the filter, and the output terminal of the voltage regulator chip is connected to the input terminal of the main control chip. The first capacitor is connected to the input terminal of the first voltage regulator chip and the ground terminal, and the second capacitor is connected to the output terminal of the first voltage regulator chip and the ground terminal.

[0011] Preferably, the second voltage regulation circuit includes a second voltage regulator chip, the input voltage pin of the second voltage regulator chip is connected to the output terminal of the filter circuit, the enable pin of the second voltage regulator chip is connected to the main control chip, and the feedback pin and the switch pin of the second voltage regulator chip are connected to the input terminal of the full-bridge circuit.

[0012] Preferably, it further includes a status indicator circuit, which is electrically connected to the main control chip.

[0013] The electromagnetic evaluation simulation device for vehicle-mounted charging equipment in this invention has the following beneficial effects: it simulates wireless charging of mobile phones in vehicles, and can set different charging powers such as 5W, 15W, 40W, 80W, and 100W, covering the operating power of products on the market. It can assess the electromagnetic radiation risk of products at different power levels in the early stages of vehicle development; the operating frequency of the simulated vehicle-mounted mobile phone charging device covers 125kHz-145kHz, covering the wireless charging frequencies of various brands of mobile phones on the market, and is not limited by the wireless charging protocol limits of each brand of mobile phone, and can continuously simulate the radiation of mobile phones in the maximum charging mode; it has three wireless charging coils, and can switch between different charging coils using a switch to simulate the effect of using different coils when charging a mobile phone; the device can be simulated to be placed in a potential assembly location on a vehicle, and the placement posture can be adjusted. Attached Figure Description

[0014] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0015] Figure 1 A schematic diagram of the principle structure of an electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown;

[0016] Figure 2 A structural block diagram of an electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown;

[0017] Figure 3 A circuit diagram of the second voltage regulation circuit, full-bridge circuit, switching circuit, and transmitting coil of the electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown.

[0018] Figure 4 A circuit diagram of the first voltage regulation circuit of the electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown;

[0019] Figure 5 A circuit diagram of the drive sub-circuit of the electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown;

[0020] Figure 6 This invention illustrates another structural schematic diagram of the transmitting coil of an electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention;

[0021] Figure 7A schematic diagram illustrating an application scenario of the electromagnetic evaluation simulation device for on-board charging equipment according to an embodiment of the present invention is shown. Detailed Implementation

[0022] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0023] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0024] To at least partially address one or more of the aforementioned problems and other potential issues, embodiments of this disclosure provide an electromagnetic evaluation simulation device for an on-board charging equipment, comprising: a power supply; a filter circuit, the input of which is electrically connected to the output of the power supply; a first voltage regulating circuit, the input of which is electrically connected to the output of the filter circuit; a main control chip, the input of which is electrically connected to the output of the first voltage regulating circuit; a drive circuit, the input of which is electrically connected to the output of the main control chip; a full-bridge circuit, the full-bridge circuit being electrically connected to the output of the drive circuit; a switching circuit, the switching circuit being connected to a bridge arm of the full-bridge circuit, the switching circuit including multiple switches, one of which is selectively turned on; a transmitting coil, the transmitting coil including multiple coils, each coil corresponding to one of the multiple switches; a second voltage regulating circuit, the input of which is connected to the output of the filter circuit, and the output of which is connected to the full-bridge circuit; and an NFC generating circuit, the NFC generating circuit being electrically connected to the main control chip, the NFC generating circuit being normally open.

[0025] Specifically, such as Figure 1As shown, the filter circuit, the first voltage regulator circuit, and the second voltage regulator circuit constitute the power adjustment module. The output voltage of the power supply is output to other parts of the analog device through the filter circuit, providing a stable voltage for the analog device. Furthermore, the first and second voltage regulator circuits provide the required voltage for the corresponding circuits. The filter circuit can be any existing filter circuit. The main control chip is connected to the transmitting coil through the drive circuit to simulate the wireless charging coil. The main control chip uses an S32K312 integrated chip. Figure 2 As shown, the first voltage regulating circuit (i.e., voltage adjustment 1) mainly provides voltage to the main control chip, which is typically 5V or 3.3V, and can use a typical transformer circuit. The second voltage regulating circuit (i.e., voltage adjustment 2) is mainly used to provide the voltage required for different charging powers. For example, when the charging power is 40W, the output voltage is set to 17V, and when the output power is 80W, the output voltage is 24V. This output voltage is set according to different charging powers before the device is turned on. Figure 2 As shown, in some embodiments, a full-bridge circuit and a switching circuit are also included. The driving circuit is connected to the full-bridge circuit and the switching circuit in sequence. The switching circuit sets multiple switches that correspond one-to-one with multiple coils of the transmitting coil to simulate various conditions of the wireless charging device. The NFC generating circuit uses an existing NFC chip (such as the ST25R3914 model chip) and an antenna. The NFC generating circuit is connected to the power supply through the main control chip. The NFC generating circuit remains in a normally open state (i.e., on state) during use. The normally open state of the NFC generating circuit causes it to continuously emit a 13.56MHz communication signal to test the radiation value under the highest operating conditions, and the on and off functions of this function are controlled by a switch.

[0026] In some embodiments, a simulated load is also included, comprising a load coil and a load resistor connected in series, the load coil being positioned at a predetermined location on the transmitting coil.

[0027] Specifically, such as Figure 1 As shown, a load resistor is connected in series with a load coil. This load coil is attached to the coil of the designed electromagnetic evaluation simulation device to simulate a mobile phone load in a charging state, using a 0.1-ohm 100W power resistor load for power dissipation. This ensures that the output power of the electromagnetic evaluation simulation device reaches the expected level.

[0028] In some embodiments, the charging coil includes a first coil, a second coil, and a third coil, and the switching switch includes multiple switching interfaces corresponding one-to-one with the coils, with the switching switch selectively energizing one of them.

[0029] Specifically, such as Figure 3As shown, the charging coil includes three coils arranged in parallel in sequence. Each of the three coils corresponds to one of the multiple switches in the switching circuit. The switching switches enable selective connection between the full-bridge circuit and the charging coil.

[0030] In some embodiments, the first coil and the second coil are arranged parallel to each other, and the third coil is arranged between the first coil and the second coil, and the third coil is arranged perpendicular to the first coil and the second coil.

[0031] Specifically, such as Figure 6 As shown, the first coil and the second coil are arranged in parallel, and the third coil is arranged vertically between the first coil and the second coil.

[0032] In some embodiments, the full-bridge circuit includes switching transistors Q1 and Q2 forming the first bridge arm, and switching transistors Q3 and Q4 forming the second bridge arm. The midpoint between the first and second bridge arms is electrically connected to the input terminal of the switching circuit.

[0033] Specifically, such as Figure 3 As shown, the full-bridge circuit includes four NPN transistors, where the collector of transistor Q1 is connected to the collector of transistor Q3, the emitter of transistor Q1 is connected to the collector of transistor Q2, the emitter of transistor Q3 is connected to the collector of transistor Q4, and the emitter of transistor Q2 is connected to the emitter of transistor Q4.

[0034] In some embodiments, the driving circuit includes multiple driving sub-circuits, each corresponding to a single switch in the full-bridge circuit. Each driving sub-circuit includes a power transistor driver chip circuit, a fault detection circuit, a driving signal receiving circuit, and a protection circuit. The protection circuit is connected to the main control chip and is connected to the power transistor driver chip circuit through the driving signal receiving circuit and the fault detection circuit. The driving signal receiving circuit and the fault detection circuit are electrically connected, and the power transistor driver chip circuit is connected to the switch in the full-bridge circuit.

[0035] Specifically, each of the multiple driver sub-circuits is connected to a corresponding transistor in the full-bridge circuit. For example... Figure 5As shown, taking the driver sub-circuit of transistor Q2 as an example, the power transistor driver chip circuit includes driver chip U1, which is an EXB841 chip. Pin 6 of driver chip U1 is connected to the collector of transistor Q2 through diode D1. Pin 3 is connected to the base of transistor Q2 through resistor Rg. Pin 1 is connected to the emitter of transistor Q2. Pin 1 is connected to resistor Rg through Zener diodes Z2 and Z1. Capacitor C1 is connected in series between pin 1 and pin 9. Capacitor C2 is connected between pin 9 and pin 2. Pin 9 is grounded. Pin 15 is connected to a 12V power supply through resistor R2. The fault detection circuit includes optocoupler U2. Pin 1 of optocoupler U2 is connected to pin 2 of driver chip U1 through resistor R3. Pin 2 of optocoupler U2 is connected to pin 5 of driver chip U1. Pin 4 of optocoupler U2 is connected to a 12V power supply through resistors R4 and R5. Pin 3 of optocoupler U2 is grounded. The drive signal receiving circuit includes transistor Q1 and resistor R1. The collector of transistor Q1 is connected to pin 14 of the drive chip U1, and the emitter of transistor Q1 is grounded through resistor R1. The protection circuit includes voltage regulator chip U3, which is a 74LS244 chip. The OUT pin of voltage regulator chip U3 is connected to the base of transistor Q1, the EN pin of voltage regulator chip U3 is connected to pin 4 of optocoupler U2, the IN pin of voltage regulator chip U3 is connected to the main control chip, the VCC pin of voltage regulator chip U3 is connected to the power supply through resistor V5, and the GND pin of voltage regulator chip U3 is grounded.

[0036] In some embodiments, the first voltage regulation circuit includes a first voltage regulator chip, a first capacitor, and a second capacitor. The input terminal of the voltage regulator chip is connected to the output terminal of the filter, the output terminal of the voltage regulator chip is connected to the input terminal of the main control chip, the first capacitor is connected to the input terminal of the first voltage regulator chip and the ground terminal, and the second capacitor is connected to the output terminal of the first voltage regulator chip and the ground terminal.

[0037] Specifically, such as Figure 4 As shown, the first voltage regulator chip uses a 7805 integrated chip. Pin 1 of the first voltage regulator chip is the input terminal connected to the power supply, pin 3 of the first voltage regulator chip is the output terminal, and pin 2 of the first voltage regulator chip is the ground terminal. A capacitor C1 is connected between pin 1 and pin 2, and a capacitor C2 is connected between pin 2 and pin 3.

[0038] In some embodiments, the second voltage regulation circuit includes a second voltage regulator chip, the input voltage pin of the second voltage regulator chip is connected to the output terminal of the filter circuit, the enable pin of the second voltage regulator chip is connected to the main control chip, and the feedback pin and the switching pin of the second voltage regulator chip are connected to the input terminal of the full-bridge circuit.

[0039] Specifically, such as Figure 3As shown, the second voltage regulator chip uses the XL6009 integrated chip. The VIN pin of the second voltage regulator chip is the input voltage pin, which is connected to the positive terminal of the power supply. The GND pin is the ground pin, which is connected to the negative terminal of the power supply. Two parallel capacitors, 1μF and 220μF, are placed between the VIN pin and the GND pin. A 47μH inductor is placed between the VIN pin and the SW pin. The SW pin is the switching pin, used to control the switching device inside the second voltage regulator chip. The SW pin is connected to the full-bridge circuit through diode D1. The SW pin is connected to the FB pin through diode D1 and variable resistor R1. The FB pin is the feedback pin, used to adjust the output voltage. A resistor R2 is placed between the FB pin and the GND pin. Two parallel capacitors, 1μF and 220μF, are placed between diode D1 and the GND pin. The EN pin is the enable pin. When the enable level is high, the second voltage regulator chip starts to work.

[0040] In some embodiments, a status indicator circuit is also included, which is electrically connected to the main control chip.

[0041] Specifically, such as Figure 2 As shown, the indicator circuit is electrically connected to the main control chip to indicate the status of the wireless charging simulation terminal.

[0042] like Figure 7 As shown, the electromagnetic evaluation simulation device for this vehicle-mounted charging equipment is set in the center console between the dashboard and the driver's seat, or between the passenger seat and the driver's seat, during use. Multiple probes are set in the driver's seat, passenger seat, and center console to collect radiation parameters.

[0043] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand this document.

Claims

1. An electromagnetic evaluation simulation device for on-board charging equipment, characterized in that, include: power supply; A filter circuit, wherein the input terminal of the filter circuit is electrically connected to the output terminal of the power supply; A first voltage regulating circuit, wherein the input terminal of the first voltage regulating circuit is electrically connected to the output terminal of the filter circuit; The main control chip, wherein the input terminal of the main control chip is electrically connected to the output terminal of the first voltage regulation circuit; A driving circuit, wherein the input terminal of the driving circuit is electrically connected to the output terminal of the main control chip; A full-bridge circuit, wherein the full-bridge circuit is electrically connected to the output terminal of the drive circuit; A switching circuit is connected to the bridge arm of the full-bridge circuit. The switching circuit includes multiple switches, one of which is selectively turned on. A transmitting coil, wherein the transmitting coil comprises multiple coils, and each of the multiple coils corresponds one-to-one with a plurality of the switches; The second voltage regulating circuit has its input terminal connected to the output terminal of the filter circuit, and its output terminal connected to the full-bridge circuit. An NFC generating circuit is electrically connected to the main control chip, and the NFC generating circuit is normally open.

2. The apparatus according to claim 1, characterized in that, It also includes a simulated load, which comprises a load coil and a load resistor connected in series, the load coil being positioned at a predetermined location on the transmitting coil.

3. The apparatus according to claim 2, characterized in that, The charging coil includes a first coil, a second coil, and a third coil. The switching switch includes multiple switching interfaces that correspond one-to-one with the coils, and the switching switch selectively turns on one of them.

4. The apparatus according to claim 3, characterized in that, The first coil and the second coil are arranged parallel to each other, and the third coil is arranged between the first coil and the second coil, and the third coil is arranged perpendicular to the first coil and the second coil.

5. The apparatus according to claim 4, characterized in that, The full-bridge circuit includes switching transistors Q1 and Q2 forming the first bridge arm, and switching transistors Q3 and Q4 forming the second bridge arm. The midpoint of the first bridge arm and the second bridge arm is electrically connected to the input terminal of the switching circuit.

6. The apparatus according to claim 5, characterized in that, The driving circuit includes multiple driving sub-circuits, each corresponding one-to-one with a plurality of switching transistors in the full-bridge circuit. Each driving sub-circuit includes a power transistor driving chip circuit, a fault detection circuit, a driving signal receiving circuit, and a protection circuit. The protection circuit is connected to the main control chip and is connected to the power transistor driving chip circuit through the driving signal receiving circuit and the fault detection circuit. The driving signal receiving circuit and the fault detection circuit are electrically connected, and the power transistor driving chip circuit is connected to the switching transistors in the full-bridge circuit.

7. The apparatus according to claim 6, characterized in that, The first voltage regulation circuit includes a first voltage regulator chip, a first capacitor, and a second capacitor. The input terminal of the voltage regulator chip is connected to the output terminal of the filter, and the output terminal of the voltage regulator chip is connected to the input terminal of the main control chip. The first capacitor is connected to the input terminal of the first voltage regulator chip and the ground terminal, and the second capacitor is connected to the output terminal of the first voltage regulator chip and the ground terminal.

8. The apparatus according to claim 7, characterized in that, The second voltage regulation circuit includes a second voltage regulator chip. The input voltage pin of the second voltage regulator chip is connected to the output terminal of the filter circuit, the enable pin of the second voltage regulator chip is connected to the main control chip, and the feedback pin and the switch pin of the second voltage regulator chip are connected to the input terminal of the full-bridge circuit.

9. The apparatus according to claim 8, characterized in that, It also includes a status indicator circuit, which is electrically connected to the main control chip.

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