A sensor application circuit of a new energy vehicle

Abstract

The application discloses a sensor application circuit of a new energy automobile, which comprises a chip unit, a power supply circuit unit, a first output circuit unit and a second output circuit unit, wherein the chip unit is provided with a power supply pin, a first output pin, a second output pin and a grounding pin, the power supply circuit unit, the first output circuit unit and the second output circuit unit are correspondingly connected to the power supply pin, the first output pin and the second output pin respectively, and the grounding pin is grounded; a first Schottky diode is arranged in the first output circuit unit, a second Schottky diode is arranged in the second output circuit unit, and the first Schottky diode and the second Schottky diode are reversely connected to the first output circuit unit and the second output circuit unit respectively. The sensor application circuit of the new energy automobile has small waveform clutter and avoids the phenomenon of controller alarm.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a sensor application circuit for new energy vehicles. Background Technology

[0002] The sensor circuits used in existing new energy vehicles are relatively simple, and there is no unified standard for the selection of components. This often leads to mismatch between the sensors and the controller, resulting in frequent malfunctions such as controller alarms, accelerator alarms, and burnt-out sensors during driving.

[0003] The mature sensor circuits currently available on the market are usually recommended by chip manufacturers and cannot meet market demands. In particular, for reverse protection at the sensor output and noise values ​​exceeding 2V, waveform filtering cannot meet the requirements of existing controllers, often resulting in controller alarms.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a sensor application circuit for new energy vehicles, which features low waveform noise and avoids controller alarms.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention discloses a sensor application circuit for new energy vehicles, including a chip unit, a power supply circuit unit, a first output circuit unit, and a second output circuit unit. The chip unit has a power supply pin, a first output pin, a second output pin, and a ground pin. The power supply circuit unit, the first output circuit unit, and the second output circuit unit are respectively connected to the power supply pin, the first output pin, and the second output pin, respectively. The ground pin is grounded. The first output circuit unit includes a first Schottky diode, and the second output circuit unit includes a second Schottky diode. The first Schottky diode and the second Schottky diode are respectively connected to the first output circuit unit and the second output circuit unit in a reverse connection manner.

[0008] Preferably, the anode of the first Schottky diode is connected to the first output terminal of the first output circuit unit, and the cathode of the first Schottky diode is connected to the first output pin; the anode of the second Schottky diode is connected to the second output terminal of the second output circuit unit, and the cathode of the second Schottky diode is connected to the second output pin.

[0009] Preferably, the first Schottky diode and the second Schottky diode are respectively connected to the first output circuit unit and the second output circuit unit in transistor package form. The collector of the transistor package of the first Schottky diode is connected to the first output pin, and the base and emitter of the transistor package of the second Schottky diode are both connected to the first output terminal of the first output circuit unit. The collector of the transistor package of the second Schottky diode is connected to the second output pin, and the base and emitter of the transistor package of the second Schottky diode are both connected to the second output terminal of the second output circuit unit.

[0010] Preferably, the power supply circuit unit includes a TVS diode, a first resistor, a first filter capacitor, and a second filter capacitor. The power supply pin is simultaneously connected to the negative terminal of the TVS diode, the first terminal of the second filter capacitor, and the first terminal of the first resistor. The power supply terminal of the power supply circuit unit is simultaneously connected to the second terminal of the first resistor and the first terminal of the first filter capacitor. The positive terminal of the TVS diode, the second terminal of the second filter capacitor, and the second terminal of the first filter capacitor are respectively grounded.

[0011] Preferably, the first output circuit unit and the second output circuit unit are the same.

[0012] Preferably, the first output circuit unit further includes a second resistor, a fourth resistor, a first transistor, a third filter capacitor, and a fifth filter capacitor. The two ends of the second resistor are connected between the power supply pin and the first output pin. The two ends of the fourth resistor are connected between the first output pin and the base of the first transistor. The collector of the first transistor is simultaneously connected to the first end of the third filter capacitor and the cathode of the first Schottky diode. The emitter of the first transistor is simultaneously connected to the second end of the third filter capacitor and the second end of the fifth filter capacitor and grounded. The first output terminal of the first output circuit unit is simultaneously connected to the anode of the first Schottky diode and the first end of the fifth filter capacitor.

[0013] Preferably, the first transistor is an NPN transistor.

[0014] Preferably, the second output circuit unit further includes a third resistor, a fifth resistor, a second transistor, a fourth filter capacitor, and a sixth filter capacitor. The two ends of the third resistor are connected between the power supply pin and the second output pin. The two ends of the fifth resistor are connected between the second output pin and the base of the second transistor. The collector of the second transistor is connected to the first end of the fourth filter capacitor and the cathode of the second Schottky diode. The emitter of the second transistor is connected to the second end of the fourth filter capacitor and the second end of the sixth filter capacitor and is grounded. The second output terminal of the second output circuit unit is connected to the anode of the second Schottky diode and the first end of the sixth filter capacitor.

[0015] Preferably, the second transistor is an NPN transistor.

[0016] Preferably, the chip unit is a Hall effect chip.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The sensor application circuit for new energy vehicles provided by the present invention, by setting a first Schottky diode and a second Schottky diode in the first output circuit unit and the second output circuit unit respectively, and the first Schottky diode and the second Schottky diode are connected in reverse connection, so that the waveform noise is small and there is no waveform leakage during the testing and use of the sensor application circuit, avoiding phenomena such as controller alarm, accelerometer alarm and sensor burnout. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the circuit structure of the sensor application circuit for new energy vehicles provided in a preferred embodiment of the present invention;

[0019] Figures 2a to 2d These are the test results for a sensor circuit without a Schottky diode;

[0020] Figure 3 These are the test results of the sensor application circuit for new energy vehicles provided in the preferred embodiment of the present invention. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for both fixing and circuit / signal connectivity.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] like Figure 1 As shown, a preferred embodiment of the present invention discloses a sensor application circuit for a new energy vehicle, including a chip unit 10, a power supply circuit unit 20, a first output circuit unit 30, and a second output circuit unit 40. The chip unit 10 is provided with a power supply pin 11, a first output pin 12, a second output pin 13, and a ground pin 14. The power supply circuit unit 20, the first output circuit unit 30, and the second output circuit unit 40 are respectively connected to the power supply pin 11, the first output pin 12, and the second output pin 13, and the ground pin 14 is grounded. The first output circuit unit 30 includes a first Schottky diode Q3, and the second output circuit unit 40 includes a second Schottky diode Q4. The first Schottky diode Q3 and the second Schottky diode Q4 are connected to the first output circuit unit 30 and the second output circuit unit 40 in a reverse connection manner.

[0025] Figure 1 In the circuit structure shown, the first Schottky diode Q3 and the second Schottky diode Q4 are respectively connected to the first output circuit unit 30 and the second output circuit unit 40 in transistor package form. The collector of the transistor package of the first Schottky diode Q3 is connected to the first output pin 12, and the base and emitter are both connected to the first output terminal OUT1 of the first output circuit unit 30. The collector of the transistor package of the second Schottky diode Q4 is connected to the second output pin 13, and the base and emitter are both connected to the second output terminal OUT2 of the second output circuit unit 40.

[0026] In other embodiments, the first Schottky diode Q3 and the second Schottky diode Q4 can also be connected in a normal anode and cathode configuration. Specifically, the first Schottky diode Q3 is connected with its anode at the first output terminal OUT1 of the first output circuit unit 30 and its cathode at the first output pin 12. The second Schottky diode Q4 is connected with its anode at the second output terminal OUT2 of the second output circuit unit 40 and its cathode at the second output pin 13.

[0027] The power supply circuit unit 20 includes a TVS diode 21, a first resistor R1, a first filter capacitor C1, and a second filter capacitor C2. Power supply pin 11 is simultaneously connected to the negative terminal of the TVS diode 21, the first terminal of the second filter capacitor C2, and the first terminal of the first resistor R1. The power supply terminal VCC of the power supply circuit unit 20 is simultaneously connected to the second terminal of the first resistor R1 and the first terminal of the first filter capacitor C1. The positive terminal of the TVS diode 21, the second terminal of the second filter capacitor C2, and the second terminal of the first filter capacitor C1 are all grounded. In a specific embodiment, the capacitance of the first filter capacitor C1 is 1uF, the capacitance of the second filter capacitor C2 is 10nF, the voltage of the TVS diode 21 is 33V, and the resistance of the first resistor R1 is 100Ω.

[0028] In this embodiment, the first output circuit unit 30 and the second output circuit unit 40 are the same, and their specific structures are as follows.

[0029] In addition to a first Schottky diode Q3 in a transistor package, the first output circuit unit 30 also includes a second resistor R2, a fourth resistor R4, a first transistor Q1, a third filter capacitor C3, and a fifth filter capacitor C5. The two ends of the second resistor R2 are connected between the power supply pin 11 and the first output pin 12. The two ends of the fourth resistor R4 are connected between the first output pin 12 and the base of the first transistor Q1. The collector of the first transistor Q1 is connected to the first terminal of the third filter capacitor C3 and the collector of the first Schottky diode Q3. The emitter of the first transistor Q1 is connected to the second terminal of the third filter capacitor C3 and the second terminal of the fifth filter capacitor C5 and grounded. The first output terminal OUT1 of the first output circuit unit 30 is connected to the base of the first Schottky diode Q3, the emitter of the first Schottky diode Q3, and the first terminal of the fifth filter capacitor C5. In this embodiment, if the first Schottky diode Q3 adopts a normal anode and cathode connection, then the anode of the first Schottky diode Q3 is connected to the first output terminal OUT1 of the first output circuit unit 30, and the cathode is connected to the collector of the first transistor Q1. The first transistor Q1 is an NPN transistor. In a specific embodiment, the resistance value of the second resistor R2 is 5.1KΩ, the resistance value of the fourth resistor R4 is 1.2KΩ, and the capacitance values ​​of the third filter capacitor C3 and the fifth filter capacitor C5 are both 1000pF.

[0030] In addition to a second Schottky diode Q4 in a transistor package, the second output circuit unit 40 also includes a third resistor R3, a fifth resistor R5, a second transistor Q2, a fourth filter capacitor C4, and a sixth filter capacitor C6. The two ends of the third resistor R3 are connected between the power supply pin 11 and the second output pin 13. The two ends of the fifth resistor R5 are connected between the second output pin 13 and the base of the second transistor Q2. The collector of the second transistor Q2 is connected to the first terminal of the fourth filter capacitor C4 and the collector of the second Schottky diode Q4. The emitter of the second transistor Q2 is connected to the second terminal of the fourth filter capacitor C4 and the second terminal of the sixth filter capacitor C6 and grounded. The second output terminal OUT2 of the second output circuit unit 40 is connected to the base of the second Schottky diode Q4, the emitter of the second Schottky diode Q4, and the first terminal of the sixth filter capacitor C6. In this embodiment, if the second Schottky diode Q4 uses a normal anode and cathode connection, then the anode of the second Schottky diode Q4 is connected to the second output terminal OUT2 of the second output circuit unit 40, and the cathode is connected to the collector of the second transistor Q2. The second transistor Q2 is an NPN transistor. In one specific embodiment, the resistance value of the third resistor R3 is 5.1KΩ, the resistance value of the fifth resistor R5 is 1.2KΩ, and the capacitance values ​​of the fourth filter capacitor C4 and the sixth filter capacitor C6 are both 1000pF.

[0031] In this embodiment, the chip unit 10 uses a Hall effect chip.

[0032] The circuit in this embodiment works as follows: the power supply VCC flows through the first filter capacitor C1, then through the first current-limiting resistor R1, through the second filter capacitor C2, and through the TVS diode 21 to the chip unit 10; the output of the first output pin 12 of the chip unit 10 flows through the second resistor R2 (pull-up resistor) to the fourth resistor R4, through the first transistor Q1 to the third filter capacitor C3, through the first Schottky diode Q3 connected in reverse, to the fifth filter capacitor C5, and finally outputs from the first output pin OUT1; the output of the second output pin 13 of the chip unit 10 flows through the third resistor R3 (pull-up resistor) to the fifth resistor R5, through the second transistor Q2 to the fourth filter capacitor C4, through the second Schottky diode Q4 connected in reverse, to the sixth filter capacitor C6, and finally outputs from the second output pin OUT2.

[0033] The sensor application circuit for new energy vehicles provided by the preferred embodiment of the present invention can solve the problems that existing products cannot meet after vehicle installation test: (1) no acceleration alarm; (2) low waveform noise (0.5V) and no alarm of the controller; (3) no waveform leakage and no alarm of the controller; (4) no damage to the sensor after output reverse current (0.5A) test; (5) no damage to the sensor after output reverse voltage (DC 60V) test.

[0034] The following tests the sensor application circuit of the new energy vehicle provided by the preferred embodiment of the present invention. At the same time, the sensor circuit without Schottky diode is also tested. The test conditions are as follows: (1) The sensor is installed on the AC asynchronous motor and the motor is installed in the vehicle system for testing; (2) The vehicle motor is tested at a temperature of -40℃ to 150℃; (3) The vehicle motor is tested for rapid acceleration (0 to 6000 rpm); (4) The vehicle motor is tested for rapid deceleration (6000 to 0 rpm); (5) The vehicle is tested on a bumpy road; (6) The controller tests the power supply to the motor and encoder, and the signal terminal is connected to an oscilloscope.

[0035] like Figures 2a to 2b The results shown are for a sensor circuit without a Schottky diode. Figure 2a The output results of the first output terminal OUT1 and the second output terminal OUT2 of the sensor circuit without Schottky diode were obtained when the vehicle motor was tested at temperatures ranging from -40℃ to 150℃. As can be seen from the figure, the output waveform of the second output terminal OUT2 is abnormal, which causes the controller to be unable to determine the direction of motor rotation, resulting in motor vibration and vehicle alarm. Figure 2bThe output results of the sensor circuit without Schottky diodes at the first output terminal OUT1 and the second output terminal OUT2 during the vehicle motor rapid acceleration test (0 to 6000 rpm) are shown in the figure. As can be seen from the figure, the output waveform of the second output terminal OUT2 is missing, which causes the controller to be unable to determine the direction of motor rotation, and the whole vehicle alarms. Figure 2c The output results of the sensor circuit without Schottky diodes at the first output terminal OUT1 and the second output terminal OUT2 during the vehicle motor rapid deceleration test (6000 to 0 rpm) are shown in the figure. As can be seen from the figure, the output waveform of the second output terminal OUT2 is abnormal, causing the controller to be unable to determine the direction of motor rotation, and the whole vehicle alarm is triggered. Figure 2d The figure shows the output results of the sensor circuit without Schottky diodes when the vehicle is tested on a bumpy road. As can be seen from the figure, the noise of both the first output terminal OUT1 and the second output terminal OUT2 is large, exceeding the threshold of the controller, causing the controller to alarm, which further causes the motor to vibrate and the whole vehicle to alarm.

[0036] like Figure 3 The figure shows the test results of the sensor application circuit for new energy vehicles provided by a preferred embodiment of the present invention. The waveforms of the first output terminal OUT1 and the second output terminal OUT2 output when performing the various experiments using the sensor application circuit for new energy vehicles provided by the preferred embodiment of the present invention are as follows: Figure 3 As shown in the figure, the output waveforms of both the first output terminal OUT1 and the second output terminal OUT2 are normal, with low waveform noise and no waveform leakage, thus avoiding phenomena such as controller alarm, accelerometer alarm, and sensor burnout.

[0037] The background section of this invention may include background information about the problems or circumstances surrounding the invention, rather than a description of prior art by others. Therefore, the content included in the background section is not an admission of prior art by the applicant.

[0038] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate different embodiments or examples and features of different embodiments or examples described in this specification without contradiction. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope defined by the appended claims.

Claims

1. A sensor application circuit for a new energy vehicle, characterized in that, The sensor includes a chip unit, a power supply circuit unit, a first output circuit unit, and a second output circuit unit. The chip unit has a power supply pin, a first output pin, a second output pin, and a ground pin. The power supply circuit unit, the first output circuit unit, and the second output circuit unit are respectively connected to the power supply pin, the first output pin, and the second output pin. The ground pin is grounded. The first output circuit unit includes a first Schottky diode, and the second output circuit unit includes a second Schottky diode. The first Schottky diode and the second Schottky diode are respectively connected in reverse to the first output circuit unit and the second output circuit unit, so that the sensor application circuit can reduce waveform noise and eliminate waveform leakage during testing and use.

2. The sensor application circuit according to claim 1, characterized in that, The anode of the first Schottky diode is connected to the first output terminal of the first output circuit unit, and the cathode is connected to the first output pin; the anode of the second Schottky diode is connected to the second output terminal of the second output circuit unit, and the cathode is connected to the second output pin.

3. The sensor application circuit according to claim 1, characterized in that, The first Schottky diode and the second Schottky diode are respectively connected to the first output circuit unit and the second output circuit unit in transistor package form. The collector of the transistor package of the first Schottky diode is connected to the first output pin, and the base and emitter are both connected to the first output terminal of the first output circuit unit. The collector of the transistor package of the second Schottky diode is connected to the second output pin, and the base and emitter are both connected to the second output terminal of the second output circuit unit.

4. The sensor application circuit according to claim 1, characterized in that, The power supply circuit unit includes a TVS diode, a first resistor, a first filter capacitor, and a second filter capacitor. The power supply pin is simultaneously connected to the negative terminal of the TVS diode, the first terminal of the second filter capacitor, and the first terminal of the first resistor. The power supply terminal of the power supply circuit unit is simultaneously connected to the second terminal of the first resistor and the first terminal of the first filter capacitor. The positive terminal of the TVS diode, the second terminal of the second filter capacitor, and the second terminal of the first filter capacitor are respectively grounded.

5. The sensor application circuit according to claim 1, characterized in that, The first output circuit unit and the second output circuit unit are the same.

6. The sensor application circuit according to claim 1, characterized in that, The first output circuit unit further includes a second resistor, a fourth resistor, a first transistor, a third filter capacitor, and a fifth filter capacitor. The two ends of the second resistor are connected between the power supply pin and the first output pin. The two ends of the fourth resistor are connected between the first output pin and the base of the first transistor. The collector of the first transistor is connected to the first end of the third filter capacitor and the cathode of the first Schottky diode. The emitter of the first transistor is connected to the second end of the third filter capacitor and the second end of the fifth filter capacitor and is grounded. The first output terminal of the first output circuit unit is connected to the anode of the first Schottky diode and the first end of the fifth filter capacitor.

7. The sensor application circuit according to claim 6, characterized in that, The first transistor is an NPN transistor.

8. The sensor application circuit according to claim 1, characterized in that, The second output circuit unit further includes a third resistor, a fifth resistor, a second transistor, a fourth filter capacitor, and a sixth filter capacitor. The two ends of the third resistor are connected between the power supply pin and the second output pin. The two ends of the fifth resistor are connected between the second output pin and the base of the second transistor. The collector of the second transistor is connected to the first end of the fourth filter capacitor and the cathode of the second Schottky diode. The emitter of the second transistor is connected to the second end of the fourth filter capacitor and the second end of the sixth filter capacitor and is grounded. The second output terminal of the second output circuit unit is connected to the anode of the second Schottky diode and the first end of the sixth filter capacitor.

9. The sensor application circuit according to claim 8, characterized in that, The second transistor is an NPN type transistor.

10. The sensor application circuit according to any one of claims 1 to 9, characterized in that, The chip unit uses a Hall effect chip.

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