Body control circuit

Abstract

The present invention provides a vehicle body control circuit, which includes: a vehicle microcontroller, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor. The vehicle microcontroller has at least a first pin and a second pin, the first resistor is connected to the first pin; one end of the second resistor is connected to an end of the first resistor that is not connected to the first pin, and the other end is grounded; there is a first node between the first resistor and the second resistor, and the first node is connected to the second pin, the first resistor and the second resistor; the third resistor is connected to the first node; one end of the first capacitor is connected to the first node, and the other end is grounded; one end of the second capacitor is connected to an end of the third resistor that is not connected to the first node, and the other end is grounded.

Description

Technical Field

[0001] The present invention relates to a vehicle body control circuit, and more particularly to a vehicle body control circuit equipped with a CYT2B7 chip. Background Art

[0002] For general vehicle body control chips and circuits, different control signals should be recognized as different control instructions by the relevant software. For example, the vehicle body's travel direction may include left and right travel, so that the different signals generated by the hardware for the two travel states should be recognized by the relevant software as a left signal and a right signal.

[0003] Considering the various noises that may exist in the circuit, which may cause the output voltage or current value to have a certain error range, as well as the short circuit or instantaneous surge that may be encountered during the plug-in and unplug process, how to design a circuit with a suitable chip to produce a stable and reliable body control circuit is the main problem to be solved in this case. Summary of the invention

[0004] In view of the above, the present invention provides a vehicle body control circuit.

[0005] A vehicle body control circuit according to an embodiment of the present invention includes: a vehicle microcontroller having a first pin and a second pin; a first resistor connected to the first pin; a second resistor, one end of which is connected to an end of the first resistor not connected to the first pin and the other end is grounded; a first capacitor, one end of which is connected to a first node between the first resistor and the second resistor and the other end is grounded, wherein the first node is connected to the second pin, the first resistor and the second resistor; a third resistor connected to the first node; and a second capacitor, one end of which is connected to an end of the third resistor not connected to the first node and the other end is grounded.

[0006] In one embodiment of the present invention, the vehicle microcontroller further has a third pin and a fourth pin, and the vehicle body control circuit further includes: a fourth resistor connected to the third pin; a fifth resistor, one end of which is connected to an end of the fourth resistor not connected to the third pin and the other end is grounded; a third capacitor, one end of which is connected to a second node between the fourth resistor and the fifth resistor and the other end is grounded, wherein the second node is connected to the fourth pin, the fourth resistor and the fifth resistor; a sixth resistor connected to the second node; a fourth capacitor, one end of which is connected to an end of the sixth resistor not connected to the second node and the other end is grounded; an electrostatic protection component, having a first end, a second end and a third end, wherein the first end is connected to an end of the third resistor not connected to the first node, the second end is connected to an end of the sixth resistor not connected to the second node, and the third end is grounded.

[0007] In one embodiment of the present invention, the electrostatic protection component includes a first transient voltage suppression diode, a second transient voltage suppression diode, a third transient voltage suppression diode and a fourth transient voltage suppression diode, wherein the first end is a cathode of the first transient voltage suppression diode, the second end is a cathode of the second transient voltage suppression diode, the third end is a connection point between a cathode of the third transient voltage suppression diode and a cathode of the fourth transient voltage suppression diode, and an anode of the first transient voltage suppression diode is connected to an anode of the third transient voltage suppression diode, and an anode of the second transient voltage suppression diode is connected to an anode of the fourth transient voltage suppression diode.

[0008] In one embodiment of the present invention, the vehicle microcontroller is a CYT2B7 chip.

[0009] In one embodiment of the present invention, multiple resistance values ​​of the first resistor, the second resistor and the third resistor satisfy the following conditions: 2.1<3.3*R2 / (R1+R2)<3.3 and 0<3.3*R3 / (R1+R3)<0.5, where R1 is a resistance value of the first resistor, R2 is a resistance value of the second resistor, and R3 is a resistance value of the third resistor.

[0010] In an embodiment of the present invention, the resistance value of the first resistor is 4700 ohms.

[0011] In an embodiment of the present invention, the resistance value of the second resistor is 10000 ohms.

[0012] In an embodiment of the present invention, the resistance value of the third resistor is 100 ohms.

[0013] In an embodiment of the present invention, the capacitance of the first capacitor is 2.2 nF.

[0014] In one embodiment of the present invention, the capacitance of the second capacitor is 68 pF.

[0015] As described above, the vehicle body control circuit of the present invention uses the first and second resistors as voltage divider resistors so that the voltage signal from the first pin of the vehicle microcontroller can be sensed by the vehicle microcontroller through its second pin for additional control, and the third resistor is used to limit the instantaneous overcurrent that may be generated during the hot plugging process, and the first capacitor and the second capacitor are used to filter out the interfering noise, so that the overall signal quality is better, and a stable and reliable vehicle body control circuit is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a circuit diagram of a vehicle body control circuit in one embodiment of the present invention;

[0017] Figure 2 Shown is a circuit diagram of a vehicle body control circuit in yet another embodiment of the present invention;

[0018] Figure 3 FIG. 4 is a circuit diagram of an electrostatic protection component in one embodiment of the present invention.

[0019] Component number description

[0020] 1. 1' Body control circuit

[0021] 10, 10' Automotive Microcontroller

[0022] 11 First pin

[0023] 12 Second pin

[0024] 13. Pin 3

[0025] 14 Pin 4

[0026] 21 First resistor

[0027] 22 Second resistor

[0028] 23 The third resistor

[0029] 24 Fourth resistor

[0030] 25 Fifth resistor

[0031] 26 Sixth resistor

[0032] 31 First Capacitor

[0033] 32 Second capacitor

[0034] 41 First control terminal

[0035] 42 Second control terminal

[0036] 5. Electrostatic protection components

[0037] 51 First End

[0038] 52 Second End

[0039] 53 The Third End

[0040] 54 First transient voltage suppression diode

[0041] 55 Second transient voltage suppression diode

[0042] 56 Third transient voltage suppression diode

[0043] 57 Fourth transient voltage suppression diode DETAILED DESCRIPTION

[0044] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable any person skilled in the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the contents disclosed in this specification, the scope of the patent application and the drawings, any person skilled in the relevant art can easily understand the relevant purposes and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any viewpoint.

[0045] Please refer to Figure 1 , Figure 1 1 is a circuit diagram of a vehicle body control circuit according to an embodiment of the present invention. In this example, the vehicle body control circuit 1 includes a vehicle microcontroller 10, a first resistor 21, a second resistor 22, a third resistor 23, a first capacitor 31 and a second capacitor 32. The vehicle microcontroller 10 has at least a first pin 11 and a second pin 12, and other pins that the vehicle microcontroller 10 may have are omitted. The first resistor 21 is connected to the first pin 11. One end of the second resistor 22 is connected to an end of the first resistor 21 that is not connected to the first pin 11, and the other end is grounded. One end of the first capacitor 31 is connected to a first node N1 between the first resistor 21 and the second resistor 22, and the other end is grounded, wherein the first node N1 is connected to the second pin 12, the first resistor 21 and the second resistor 22. The third resistor 23 is connected to the first node N1. One end of the second capacitor 32 is connected to an end of the third resistor 23 that is not connected to the first node N1, and the other end is grounded. In addition, the connection point between the third resistor 23 and the second capacitor 32 can be used as the first control terminal 41 and can be in a floating state or a grounded state.

[0046] In this example, the vehicle microcontroller 10 can be, for example, the CYT2B7 chip produced by Infineon Technologies AG, especially in a 64-LQFP package. Specifically, the first pin 11 can be a pin capable of supplying a voltage signal, and the second pin 12 can be a pin connected to an internal Analog-to-Digital Conversion (ADC) module. However, in other embodiments, the vehicle microcontroller 10 can be, for example, other types of chips, as long as they have the function of analog-to-digital signal conversion and the pins connected thereto. Taking the CYT2B7 chip as an example, the first pin 11 and the second pin 12 can be the P5_1 pin and the P7_1 pin of the CYT2B7 chip, respectively.

[0047] The first pin 11 of the vehicle microcontroller 10 is used to provide an analog voltage signal, and the second pin is used to sense a voltage value, and the vehicle microcontroller 10 internally determines the voltage level range in which the voltage value is located to generate a corresponding digital signal. For example, the first pin 11 of the vehicle microcontroller 10 can provide an analog voltage signal with a voltage value of 3.3V. On the other hand, the internal circuit of the vehicle microcontroller 10 is designed to determine a voltage signal of 0V - 0.5V received by the second pin 12 as a low voltage level, and a voltage signal of 2.1V - 3.3V as a high voltage level, where 0V, 0.5V, 2.1V, and 3.3V are only examples, and those with ordinary knowledge in the field to which this case belongs can design the voltage value ranges corresponding to the low / high voltage levels as required.

[0048] Specifically, in one embodiment, the resistance value of each resistor can be such that the resistance value (R1) of the first resistor 21 is equal to 4700 ohms, the resistance value (R2) of the second resistor 22 is equal to 10000 ohms, and the resistance value (R3) of the third resistor 23 is equal to 100 ohms. The operation of the body control circuit 1 will be described in detail below for two cases where the first control terminal 41 is grounded and floating according to the above judgment criteria for low / high voltage levels and the resistor combination.

[0049] When the first control terminal 41 is grounded, since R3 < R2, the above voltage signal will flow through the first resistor 21, the first node N1, the third resistor 23 to the first control terminal 41. In this case, the first resistor 21 and the third resistor 23 can jointly share the above voltage signal (3.3V), that is, the voltage value at the first node N1 is 3.3 * R3 / (R1 + R3) = 3.3 * 100 / (4700 + 100) = 0.069V (two significant figures). Therefore, the vehicle microcontroller 10 can measure a voltage value of 0.069V through the second pin 12, and according to the above judgment criteria, a low voltage level (L) can be obtained.

[0050] When the first control terminal 41 is floating, the resistance value of the first control terminal 41 can be regarded as infinite, so that the voltage signal will flow through the first resistor 21, the first node N1 to the second resistor 22 and then to the ground. In this case, the first resistor 21 and the second resistor 22 can share the above voltage signal (3.3V), that is, the voltage value at the first node N1 is 3.3*R2 / (R1+R2)=3.3*10000 / (4700+10000)=2.2V (two significant digits). Therefore, the automotive microcontroller 10 can measure a voltage value of 2.2V through the second pin 12, and then obtain a high voltage level (H) according to the above judgment standard.

[0051] At this point, those familiar with the general knowledge in this field should be able to understand that by properly arranging the resistance values ​​of the three resistors R1, R2 and R3, the voltage value of the first node N1 can be effectively placed in the range of the above-mentioned low voltage level or high voltage level. Specifically, when 0<3.3*R3 / (R1+R3)<0.5 and 2.1<3.3*R2 / (R1+R2)<3.3, a low voltage level or a high voltage level can be generated correspondingly according to whether the first control terminal 41 is grounded or floating, without being limited to the above-mentioned resistance value combination. For another example, R1, R2 and R3 can be 2300 ohms, 5000 ohms and 50 ohms in sequence, or other resistance values ​​that meet the above conditions, which will not be repeated here. In particular, the third resistor 23 of this example can act as a current limiting resistor to prevent or reduce the instantaneous overcurrent generated during the hot plug process to protect the automotive microcontroller 10.

[0052] In this example, the first capacitor 31 and the second capacitor 32 can also conduct high-frequency signals to the ground line to serve as filter capacitors. For example, when the first control terminal 41 is converted from a floating state to a grounded state, a transient surge may be generated, which is conducted to the ground line via the first capacitor 31 and / or the second capacitor 32 to avoid unwanted effects on the vehicle microcontroller 10. Specifically, the capacitance value C1 of the first capacitor 31 can be 2.2nF and the capacitance value C2 of the second capacitor can be 68pF. By selecting appropriate two capacitance values, the effect of filtering out the band noise can be optimized, and the selection of the capacitance value is not limited to this.

[0053] Through the above Figure 1 The vehicle body control circuit 1 of the embodiment can convert the voltage signal into a high voltage level or a low voltage level to correspond to two digital control signals of the file level. For example, the high voltage level can correspond to the digital control signal of the vehicle body "turning left", and the low voltage level can correspond to the digital control signal of the vehicle body "turning right", and vice versa, or respectively correspond to the control signal of the vehicle body "moving forward" or "moving backward", but the present invention is not limited to this.

[0054] Please refer to Figure 2 , Figure 2 FIG. 1 is a circuit diagram of a vehicle body control circuit according to another embodiment of the present invention. In this example, the vehicle microcontroller 10′ has Figure 1 In addition to the first pin 11 and the second pin 12, the vehicle microcontroller 10 also has a third pin 13 and a fourth pin 14 (other pins that the vehicle microcontroller 10' may have are omitted here), wherein the third pin 13 corresponds to the first pin 11 and is also used to supply another voltage signal, and the fourth pin 14 corresponds to the second pin 12 and can be connected to an internal analog / digital signal conversion module. Figure 1 In the embodiment, the automotive microcontroller 10' can be, for example, a CYT2B7 chip produced by Infenion, in particular a 64-LQFP package, wherein the first pin 11, the second pin 12, the third pin 13 and the fourth pin 14 can be respectively the P5_1 pin, the P7_1 pin, the P11_0 pin and the P7_2 pin of the CYT2B7 chip. In this example, the first resistor 21, the second resistor 22, the third resistor 23, the first capacitor 31, the second capacitor 32 and the first control terminal 41 connected to the first pin 11 and the second pin 12 are connected to the first resistor 21, the second resistor 22, the third resistor 23, the first capacitor 31, the second capacitor 32 and the first control terminal 41 and Figure 1 The functions and connection relationships of the embodiments are the same and will not be described in detail here.

[0055] The body control circuit 1' of this example further includes a fourth resistor 24, a fifth resistor 25, a sixth resistor 26, a third capacitor 33 and a fourth capacitor 34. The fourth resistor 24 is connected to the third pin 13. One end of the fifth resistor 25 is connected to the end of the fourth resistor 24 that is not connected to the second pin 12, and the other end is grounded. One end of the third capacitor 33 is connected to a second node N2 between the fourth resistor 22 and the fifth resistor 25, and the other end is grounded, wherein the second node N2 is connected to the fourth pin 14, the fourth resistor 24 and the fifth resistor 25. The sixth resistor 26 is connected to the second node N2. One end of the fourth capacitor 34 is connected to the end of the sixth resistor 26 that is not connected to the second node N2, and the other end is grounded. In addition, the connection between the sixth resistor 26 and the fourth capacitor 34 can be used as a second control terminal 42, which can be in a floating state or a grounded state. It should be noted that the fourth to sixth resistors correspond to the first and third resistors, respectively, and the third and fourth capacitors correspond to the first and second capacitors, respectively, that is, the circuit connected to the third and fourth pins is basically the same as the circuit connected to the first and second pins, and the properties, connections and effects that are the same as the above circuits will not be described again here.

[0056] like Figure 2As shown, the vehicle body control circuit 1' of this example further includes an electrostatic protection component 5, having a first end 51, a second end 52 and a third end 53, wherein the first end 51 is connected to an end of the third resistor 23 that is not connected to the first node N1, the second end 52 is connected to an end of the sixth resistor 26 that is not connected to the second node N2, and the third end 53 is grounded. Specifically, the electrostatic protection component 5 (Electrostatic Discharge Protection Device, ESD) can be composed of a plurality of diodes or a plurality of transient voltage suppressors (Transient Voltage Suppressor, TVS), and is mainly used for electrostatic protection, including the damage that the above-mentioned transient surge or overcurrent may cause to the vehicle microcontroller 10. In other words, the electrostatic protection component 5 can be used as a double protection against the transient overcurrent that may be caused by hot plugging in addition to the third resistor 23 and the sixth resistor 26.

[0057] Please refer to Figure 3 , Figure 3 is a circuit diagram of an electrostatic protection component according to another embodiment of the present invention. The electrostatic protection component 5 may include a first transient voltage suppression diode 54, a second transient voltage suppression diode 55, a third transient voltage suppression diode 56 and a fourth transient voltage suppression diode 57, wherein the first end 51 is a cathode of the first transient voltage suppression diode 54, the second end 52 is a cathode of the second transient voltage suppression diode 55, the third end 53 is a connection point of a cathode of the third transient voltage suppression diode 56 and a cathode of the fourth transient voltage suppression diode 57, and an anode of the first transient voltage suppression diode 54 is connected to an anode of the third transient voltage suppression diode 55, and an anode of the second transient voltage suppression diode 56 is connected to an anode of the fourth transient voltage suppression diode 57. In this way, through the transient voltage suppression diodes with two anodes connected, the occurrence of transient overcurrent can be effectively suppressed, and the first and second ends of the protection component can be connected to two groups of circuit units respectively, and the two groups of circuit units are protected at the same time.

[0058] Through the above Figure 2The vehicle body control circuit 1' of the embodiment can convert the two voltage signals supplied from the first pin 11 and the third pin 13 into a high voltage level or a low voltage level to correspond to the digital control signals of two file positions respectively. For example, when the second pin 12 receives a high voltage level (H1), it can correspond to the digital control signal of the "front" of the vehicle body, when the second pin 12 receives a low voltage level (L1), it can correspond to the digital control signal of the "rear" of the vehicle body, when the fourth pin 14 receives a high voltage level (H2), it can correspond to the digital control signal of the "left" of the vehicle body, and when the fourth pin 14 receives a low voltage level (H2), it can correspond to the digital control signal of the "right" of the vehicle body. In summary, through the combination of the high and low levels received by the second pin 12 and the fourth pin 14, the control signals of "front left side (H1H2)", "front right side (H1L2)", "rear left side (L1H2)" and "rear right side (L1L2)" can be generated respectively.

[0059] Through the above structure, the body control circuit of the present invention uses the first and second resistors as voltage divider resistors so that the voltage signal from the first pin of the vehicle microcontroller can be sensed by the vehicle microcontroller through its second pin for additional control, and the third resistor is used to limit the instantaneous overcurrent that may be generated during the hot plugging process, and the first capacitor and the second capacitor are used to filter out the interfering noise, so that the overall signal quality is better, and a stable and reliable body control circuit is achieved. In addition, if the vehicle microcontroller has multiple analog / digital conversion pins, the above circuit can be repeatedly configured to generate multiple digital signals (high-low) like binary system, so as to achieve more sophisticated body control purposes.

[0060] The foregoing summarizes the features of several embodiments so that those skilled in the art can better understand the aspects of the present invention. Those skilled in the art should understand that they can easily use the present invention as a basis for designing or modifying other processes and structures for achieving the same purpose and / or achieving the same advantages of the embodiments described herein. Those skilled in the art should also recognize that these equivalent constructions do not depart from the spirit and scope of the present invention, and that they can make various changes, substitutions and replacements herein without departing from the spirit and scope of the present invention.

Claims

1. A body control circuit, It is characterized in that include: A vehicle microcontroller has a first pin and a second pin; a first resistor connected to the first pin; a second resistor, one end of which is connected to the end of the first resistor not connected to the first pin and the other end of which is grounded; a first capacitor, one end of which is connected to a first node between the first resistor and the second resistor, and the other end of which is grounded, wherein the first node is connected to the second pin, the first resistor and the second resistor; a third resistor connected to the first node, wherein a connection point between the third resistor and the second capacitor serves as a first control terminal, and the first control terminal is in a floating state or a grounded state; and A second capacitor has one end connected to the end of the third resistor not connected to the first node, and the other end grounded.

2. The vehicle body control circuit according to claim 1, It is characterized in that The vehicle microcontroller further has a third pin and a fourth pin, and the vehicle body control circuit further includes: a fourth resistor connected to the third pin; a fifth resistor, one end of which is connected to the end of the fourth resistor not connected to the third pin and the other end of which is grounded; a third capacitor, one end of which is connected to a second node between the fourth resistor and the fifth resistor, and the other end of which is grounded, wherein the second node is connected to the fourth pin, the fourth resistor and the fifth resistor; a sixth resistor connected to the second node; a fourth capacitor, one end of which is connected to the end of the sixth resistor that is not connected to the second node, and the other end of which is grounded, wherein the connection between the sixth resistor and the fourth capacitor serves as a second control end, and the second control end is in a floating state or a grounded state; An electrostatic protection component has a first end, a second end and a third end, wherein the first end is connected to an end of the third resistor that is not connected to the first node, the second end is connected to an end of the sixth resistor that is not connected to the second node, and the third end is grounded.

3. The vehicle body control circuit according to claim 2, It is characterized in that The electrostatic protection component includes a first transient voltage suppression diode, a second transient voltage suppression diode, a third transient voltage suppression diode and a fourth transient voltage suppression diode, wherein the first end is a cathode of the first transient voltage suppression diode, the second end is a cathode of the second transient voltage suppression diode, the third end is a connection point between a cathode of the third transient voltage suppression diode and a cathode of the fourth transient voltage suppression diode, and an anode of the first transient voltage suppression diode is connected to an anode of the third transient voltage suppression diode, and an anode of the second transient voltage suppression diode is connected to an anode of the fourth transient voltage suppression diode.

4. The vehicle body control circuit according to claim 1, It is characterized in that The vehicle-used microcontroller is a CYT2B7 chip.

5. The vehicle body control circuit according to claim 1, It is characterized in that The multiple resistance values ​​of the first resistor, the second resistor and the third resistor satisfy the following conditions: 2.1<3.3*R2 / (R1+R2)<3.3 and 0<3.3*R3 / (R1+R3)<0.5, where R1 is a resistance value of the first resistor, R2 is a resistance value of the second resistor, and R3 is a resistance value of the third resistor.

6. The vehicle body control circuit according to claim 1, It is characterized in that The resistance value of the first resistor is 4700 ohms.

7. The vehicle body control circuit according to claim 1, It is characterized in that The resistance value of the second resistor is 10000 ohms.

8. The vehicle body control circuit according to claim 1, It is characterized in that The resistance value of the third resistor is 100 ohms.

9. The vehicle body control circuit according to claim 1, It is characterized in that The capacitance value of the first capacitor is 2.2 nF.

10. The vehicle body control circuit according to claim 1, It is characterized in that The capacitance value of the second capacitor is 68 pF.

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