Input voltage stabilizing circuit of passenger car

Abstract

The utility model discloses an input voltage stabilizing circuit of a passenger car, which belongs to the technical field of car body electronic circuits, comprises two stages of motor control units on the premise of keeping cost, can realize stable operation, monitors the operation state of a motor in real time, and effectively ensures the normal operation of car body equipment.

Description

Technical Field

[0001] The utility model discloses an input voltage stabilizing circuit for a passenger car, belonging to the technical field of vehicle body electronic circuits. Background Art

[0002] More and more electronic devices are installed in vehicles, which brings convenience to life and also raises the requirements for production quality. Especially now, the requirements for the sense of technology in the car are getting higher and higher, including many motor control modules. There must be motors in the body components such as seats, windows, doors, sunroofs, etc. When improving the riding experience, safety should also be given enough attention. The current input voltage regulation cannot achieve stable operation while maintaining the cost. Utility Model Content

[0003] The utility model aims to solve the problem that the current input voltage stabilization cannot achieve stable operation under the premise of maintaining the cost, and proposes an input voltage stabilization circuit for a passenger car.

[0004] The problem to be solved by the utility model is achieved by the following technical solutions:

[0005] A passenger car input voltage stabilizing circuit comprises a sixth resistor whose first end is electrically connected to an MCU network end, a second end of the sixth resistor is electrically connected to one end of a first capacitor, one end of a thirteenth resistor, and a first end of a bottom switch, a second end of the bottom switch is electrically connected to the other end of the first capacitor, the other end of the thirteenth resistor, and a GND end, a third end of the bottom switch is electrically connected to one end of a seventh resistor, the other end of the seventh resistor is electrically connected to one end of a diode and a second end of a second relay, the other end of the diode is electrically connected to a first end of the second relay and a positive power supply (VBAT), a third end of the second relay is electrically connected to a third end of a third relay and a fifth end of the first relay, a fourth end of the second relay is electrically connected to one end of a first motor, the other end of the first motor is electrically connected to the fifth end of the fourth relay and one end of the second motor, and the other end of the second motor is electrically connected to the fourth end of the third relay;

[0006] The third end of the first relay is electrically connected to the positive pole of the power supply, the fourth end of the first relay is electrically connected to one end of the seventeenth resistor and one end of the second resistor respectively, the other end of the seventeenth resistor is electrically connected to one end of the third capacitor and one end of the third resistor, the other end of the third resistor is electrically connected to one end of the first resistor and the fifth end of the second operational amplifier, the other end of the first resistor is electrically connected to the GND end, the other end of the second resistor is electrically connected to one end of the sixteenth resistor and the GND end respectively, the other end of the sixteenth resistor is electrically connected to the other end of the third capacitor and one end of the fourth resistor, the other end of the fourth resistor is electrically connected to the sixth end of the second operational amplifier and one end of the fifth resistor respectively, the other end of the fifth resistor is electrically connected to the seventh end of the second operational amplifier, one end of the fifth capacitor and the first end of the single-chip computer respectively, and the other end of the fifth capacitor is electrically connected to the GND end;

[0007] The fourth end of the fourth relay is electrically connected to the positive pole of the power supply, the third end of the fourth relay is electrically connected to one end of the fifteenth resistor and one end of the eighth resistor respectively, the other end of the fifteenth resistor is electrically connected to one end of the second capacitor and one end of the ninth resistor respectively, the other end of the ninth resistor is electrically connected to one end of the tenth resistor and the third end of the first operational amplifier respectively, the other end of the tenth resistor is electrically connected to the GND end, the other end of the eighth resistor is electrically connected to the GND end and one end of the fourteenth resistor respectively, the other end of the fourteenth resistor is electrically connected to the other end of the second capacitor and one end of the eleventh resistor respectively, the other end of the eleventh resistor is electrically connected to the second end of the first operational amplifier and one end of the twelfth resistor respectively, the fourth end and the eighth end of the first operational amplifier are electrically connected to the VCC end and the GND end respectively, the first end of the first operational amplifier is electrically connected to the other end of the twelfth resistor, one end of the fourth capacitor and the second end of the single-chip computer respectively, and the other end of the fourth capacitor is electrically connected to the GND end.

[0008] Preferably, the eighth resistor, the fifteenth resistor, the fourteenth resistor, the second capacitor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, the first operational amplifier and the fourth capacitor constitute a first group of low-end current detection circuits, and the second resistor, the seventeenth resistor, the sixteenth resistor, the third capacitor, the third resistor, the fourth resistor, the first resistor, the fifth resistor, the second operational amplifier and the fifth capacitor constitute a second group of low-end current detection circuits.

[0009] The utility model has the following beneficial effects compared with the prior art:

[0010] The utility model provides an input voltage stabilizing circuit for a passenger car, which includes a two-stage motor control unit while maintaining the cost, can achieve stable operation, and monitor the motor operation status in real time, effectively ensuring the normal operation of the vehicle body equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model discloses a circuit diagram of an input voltage stabilizing circuit of a passenger car.

[0012] Figure 2 The utility model is a partial circuit diagram of an input voltage stabilizing circuit of a passenger car.

[0013] Figure 3 The utility model is a partial circuit diagram of an input voltage stabilizing circuit of a passenger car. DETAILED DESCRIPTION

[0014] The following is based on the attached Figure 1-3 The utility model is further described as follows:

[0015] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1-3As shown, the first embodiment of the utility model provides an input voltage stabilizing circuit for a passenger car on the basis of the prior art, including a sixth resistor R6 whose first end is electrically connected to the MCU network end, a second end of the sixth resistor R6 is electrically connected to one end of the first capacitor C1, one end of the thirteenth resistor R13, and a first end of the bottom switch Q1, a second end of the bottom switch Q1 is electrically connected to the other end of the first capacitor C1, the other end of the thirteenth resistor and the GND end, a third end of the bottom switch Q1 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the second One end of the diode D1 is electrically connected to the second end of the second relay K2, the other end of the diode D1 is electrically connected to the first end of the second relay K2 and the positive power supply VBAT respectively, the third end of the second relay K2 is electrically connected to the third end of the third relay K3 and the fifth end of the first relay K1 respectively, the fourth end of the second relay K2 is electrically connected to one end of the first motor M1, the other end of the first motor M1 is electrically connected to the fifth end of the fourth relay K4 and one end of the second motor M2 respectively, and the other end of the second motor M2 is electrically connected to the fourth end of the third relay K3.

[0019] The third end of the first relay K1 is electrically connected to the positive power supply electrode VBAT, the fourth end of the first relay K1 is electrically connected to one end of the seventeenth resistor R17 and one end of the second resistor R2, the other end of the seventeenth resistor R17 is electrically connected to one end of the third capacitor C3 and one end of the third resistor R3, the other end of the third resistor R3 is electrically connected to one end of the first resistor R1 and the fifth end of the second operational amplifier U1-B, the other end of the first resistor R1 is electrically connected to the GND end, the other end of the second resistor R2 is electrically connected to the tenth One end of the six resistor R16 is electrically connected to the GND end, the other end of the sixteenth resistor R16 is electrically connected to the other end of the third capacitor C3 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is electrically connected to the sixth end of the second operational amplifier U1-B and one end of the fifth resistor R5, respectively, the other end of the fifth resistor R5 is electrically connected to the seventh end of the second operational amplifier U1-B, one end of the fifth capacitor C5 and the first end I-READ-1 of the microcontroller, and the other end of the fifth capacitor C5 is electrically connected to the GND end.

[0020] The fourth end of the fourth relay K4 is electrically connected to the positive power supply electrode VBAT, the third end of the fourth relay K4 is electrically connected to one end of the fifteenth resistor R15 and one end of the eighth resistor R8, the other end of the fifteenth resistor R15 is electrically connected to one end of the second capacitor C2 and one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected to one end of the tenth resistor R10 and the third end of the first operational amplifier U1-A, the other end of the tenth resistor R10 is electrically connected to the GND end, the other end of the eighth resistor R8 is electrically connected to the GND end and one end of the fourteenth resistor R14, The other end of the fourteenth resistor R14 is electrically connected to the other end of the second capacitor C2 and one end of the eleventh resistor R11, respectively; the other end of the eleventh resistor R11 is electrically connected to the second end of the first operational amplifier U1-A and one end of the twelfth resistor R12, respectively; the fourth end and the eighth end of the first operational amplifier U1-A are electrically connected to the VCC end and the GND end, respectively; the first end of the first operational amplifier U1-A is electrically connected to the other end of the twelfth resistor R12, one end of the fourth capacitor C4 and the second end I-READ-2 of the microcontroller, respectively; and the other end of the fourth capacitor C4 is electrically connected to the GND end.

[0021] The above-mentioned eighth resistor R8, fifteenth resistor R15, fourteenth resistor R14, second capacitor C2, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, first operational amplifier U1-A and fourth capacitor C4 constitute a first group of low-end current detection circuits, and the second resistor R2, seventeenth resistor R17, sixteenth resistor R16, third capacitor C3, third resistor R3, fourth resistor R4, first resistor R1, fifth resistor R5, second operational amplifier U1-B and fifth capacitor C5 constitute a second group of low-end current detection circuits.

[0022] In this embodiment, the first relay K1 and the fourth relay K4 constitute a primary power control unit, which can control the direction of current flow and can use single-package dual-channel and two independently packaged relays. The second relay K2 and the fourth relay K4 constitute a secondary control unit, which can selectively turn on one or several relays.

[0023] The diode D1 can discharge the large current of the relay inductive coil when the relay is turned off. The bottom switch Q1 can use a Darlington tube or an NPN transistor. When a high level is input to pin 1, the corresponding relay can be turned on: the sixth resistor R6 has a current limiting function, which can ensure that the voltage between pins 1 and 2 is within the rated range of the bottom switch Q1 when the bottom switch Q1 is turned on, thereby ensuring the normal operation of the bottom switch Q1.

[0024] The first capacitor C1 and the sixth resistor R6 form a low-pass filter, which can ensure that there is no high-frequency noise when the bottom switch Q1 is turned on or off. The thirteenth resistor R13 ensures that the 1st pin of the bottom switch Q1 is low when the motor is not working to avoid false opening. The seventh resistor R7 ensures that the current flowing through the bottom switch Q1 is within the rated range of the bottom switch Q1 when the bottom switch Q1 is turned on to ensure that the bottom switch Q1 works normally. The resistance value of the eighth resistor R8 is very low, and the voltage drop of this resistor is used to judge the current flowing through the motor. The resistance values ​​of the fifteenth resistor R15 and the fourteenth resistor R14 are relatively low, and are used to match the input of the first operational amplifier U1-A. The capacitance value of the second capacitor C2 is very low, and the noise of the analog signal passing through the fifteenth resistor R15 and the fourteenth resistor R14 is filtered out. Among the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12, the ninth resistor R9 and the eleventh resistor R11 are completely identical, the tenth resistor R10 and the twelfth resistor R12 are completely identical, and these four resistors together constitute the amplification gain of the voltage amplifier circuit.

[0025] The first operational amplifier U1-A is the core component of the current detection circuit. The fourth capacitor C4 filters out the noise of the analog signal output by the first operational amplifier U1-A. Each relay needs to have a motor selection control circuit.

[0026] The first relay K1 and the fourth relay K4 are used to control the direction of the current. They cannot be turned on at the same time, but there can be a dead zone. The default state is that the output ends of the first relay K1 and the fourth relay K4 are connected to GND, and the output ends of the second relay K2 and the third relay K3 are floating. When the first relay K1 is turned on and the fourth relay K4 is turned off, the first relay K1 is connected to the power supply, and the fourth relay K4 is connected to GND. At this time, the direction of the current is from the 3rd pin of the first relay K1 → the 5th pin of the first relay K1 → point A → point B → the 5th pin of K4 → the 3rd pin of the fourth relay K4 → the eighth resistor R8 → GND. At this time, the motor rotates forward.

[0027] When the first relay K1 is turned off and the fourth relay K4 is turned on, the first relay K1 and GND are connected, and the fourth relay K4 and the power supply are connected. At this time, the direction of the current is from pin 4 of the fourth relay K4 → pin 5 of the fourth relay K4 → point B → point A-, pin 5 of the first relay K1 →, pin 4 of the first relay K1 → R2 → GND, and the motor reverses.

[0028] When the MCU1 network input is high level, the output end or collector of the bottom switch Q1 and GND are turned on. At this time, the direction of the current is: the positive electrode of the power supply VBAT → pin 1 of the second relay K2 → pin 2 of the positive electrode of the power supply K2 → pin 2 of the seventh resistor R7 → pin 1 of the seventh resistor R7 → pin 3 of the bottom switch Q1 → pin 2 of the bottom switch Q1 → GND. At this time, sufficient current flows through the input end of the second relay K2 of the relay switch, and the switch is closed to control the rotation of the first motor M1.

[0029] When the MCU1 network input is low level, there is not enough voltage difference between pin 1 of the bottom switch Q1 and pin 2 of the bottom switch Q1, and not enough current flows, so the output end is cut off.

[0030] When MCU1 changes from high level to low level, the 1st pin of the second relay K2 and the 2nd pin of the second relay K2 have very large electromagnetic induction because they are traditional coils, and at the same time, they are accompanied by the influence of suppressing current changes, resulting in a period of continuous current flow. The diode D1 can consume this current in a short time to avoid damage to the relay.

[0031] When the motor is running, the current will flow through one of the current sensing eighth resistor R8 or the second resistor R2 to monitor the working status.

[0032] Here, the eighth resistor R8 is taken as an example: the eighth resistor R8 reaches the mΩ level, and when the current flowing through the single machine passes through the eighth resistor R8. A very small voltage drop will be generated, and such a voltage drop has no effect on the operation of the motor. The fifteenth resistor R15 and the fourteenth resistor R14 are matching resistors, reaching the Ω level, and the second capacitor C2 reaches the pF level. However, the addition of external series resistors will produce additional errors in the measurement, so the values ​​of these series resistors should be kept at 10Ω or less, if possible, to reduce the impact on accuracy. The bias network of the first operational amplifier U1-A exists on the input pins, and when a differential voltage is applied between the input pins, a mismatch will be generated in the input bias current. If an additional external series filter resistor is added to the circuit, the mismatch of the bias current will cause a mismatch in the voltage drop across the filter resistor. This mismatch produces a differential error voltage, which should be subtracted from the voltage generated at the shunt resistor.

[0033] The ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 are the bias network of the first operational amplifier U1-A. The ninth resistor R9 and the eleventh resistor R11 should usually be set to the same resistance value, and the tenth resistor R10 and the twelfth resistor R12 should also be set to the same resistance value. The ninth resistor R9 and the eleventh resistor R11 are often tens of KΩ, and the tenth resistor R10 and the thirteenth resistor R13 are often hundreds of KΩ. The second terminal I-READ-2 of the single-chip microcomputer is connected to the ADC pin of the single-chip microcomputer. For the control system, the level of the second terminal I-READ-2 of the single-chip microcomputer is determined by VCC. In order to ensure the detection voltage range, the twelfth resistor R12 / ninth resistor R9 should be less than VCC / VRB.

[0034] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. An input voltage stabilizing circuit for a passenger car, characterized in that: The invention comprises a sixth resistor (R6) whose first end is electrically connected to the MCU network end, the second end of the sixth resistor (R6) is electrically connected to one end of the first capacitor (C1), one end of the thirteenth resistor (R13), and the first end of the bottom switch (Q1), the second end of the bottom switch (Q1) is electrically connected to the other end of the first capacitor (C1), the other end of the thirteenth resistor and the GND end, the third end of the bottom switch (Q1) is electrically connected to one end of the seventh resistor (R7), and the other end of the seventh resistor (R7) is electrically connected to one end of the diode (D1) and the second end of the second relay (K2). The first motor (M1) is electrically connected to the first end of the second relay (K2) and the positive electrode of the power supply (VBAT), the other end of the diode (D1) is electrically connected to the first end of the second relay (K2) and the positive electrode of the power supply (VBAT), the third end of the second relay (K2) is electrically connected to the third end of the third relay (K3) and the fifth end of the first relay (K1), the fourth end of the second relay (K2) is electrically connected to one end of the first motor (M1), the other end of the first motor (M1) is electrically connected to the fifth end of the fourth relay (K4) and one end of the second motor (M2), and the other end of the second motor (M2) is electrically connected to the fourth end of the third relay (K3); The third end of the first relay (K1) is electrically connected to the positive electrode (VBAT) of the power supply, the fourth end of the first relay (K1) is electrically connected to one end of the seventeenth resistor (R17) and one end of the second resistor (R2), the other end of the seventeenth resistor (R17) is electrically connected to one end of the third capacitor (C3) and one end of the third resistor (R3), the other end of the third resistor (R3) is electrically connected to one end of the first resistor (R1) and the fifth end of the second operational amplifier (U1-B), the other end of the first resistor (R1) is electrically connected to the GND end, and the other end of the second resistor (R2) is electrically connected to one end of the first resistor (R1) and the fifth end of the second operational amplifier (U1-B). The first embodiment of the present invention is a circuit diagram of a first embodiment of the present invention which is electrically connected to one end of a sixteenth resistor (R16) and a GND terminal, the other end of the sixteenth resistor (R16) is electrically connected to the other end of the third capacitor (C3) and one end of the fourth resistor (R4), the other end of the fourth resistor (R4) is electrically connected to the sixth end of the second operational amplifier (U1-B) and one end of the fifth resistor (R5), the other end of the fifth resistor (R5) is electrically connected to the seventh end of the second operational amplifier (U1-B), one end of the fifth capacitor (C5) and the first end (I-READ-1) of the single-chip computer, and the other end of the fifth capacitor (C5) is electrically connected to the GND terminal; The fourth end of the fourth relay (K4) is electrically connected to the positive electrode (VBAT) of the power supply, the third end of the fourth relay (K4) is electrically connected to one end of the fifteenth resistor (R15) and one end of the eighth resistor (R8), the other end of the fifteenth resistor (R15) is electrically connected to one end of the second capacitor (C2) and one end of the ninth resistor (R9), the other end of the ninth resistor (R9) is electrically connected to one end of the tenth resistor (R10) and the third end of the first operational amplifier (U1-A), the other end of the tenth resistor (R10) is electrically connected to the GND end, the other end of the eighth resistor (R8) is electrically connected to the GND end and one end of the fourteenth resistor (R14), The other end of the fourteenth resistor (R14) is electrically connected to the other end of the second capacitor (C2) and one end of the eleventh resistor (R11), respectively; the other end of the eleventh resistor (R11) is electrically connected to the second end of the first operational amplifier (U1-A) and one end of the twelfth resistor (R12), respectively; the fourth end and the eighth end of the first operational amplifier (U1-A) are electrically connected to the VCC end and the GND end, respectively; the first end of the first operational amplifier (U1-A) is electrically connected to the other end of the twelfth resistor (R12), one end of the fourth capacitor (C4) and the second end (I-READ-2) of the single-chip computer, respectively; and the other end of the fourth capacitor (C4) is electrically connected to the GND end.

2. The input voltage stabilizing circuit of a passenger car according to claim 1, characterized in that: The eighth resistor (R8), the fifteenth resistor (R15), the fourteenth resistor (R14), the second capacitor (C2), the ninth resistor (R9), the tenth resistor (R10), the eleventh resistor (R11), the twelfth resistor (R12), the first operational amplifier (U1-A) and the fourth capacitor (C4) constitute a first group of low-end current detection circuits; the second resistor (R2), the seventeenth resistor (R17), the sixteenth resistor (R16), the third capacitor (C3), the third resistor (R3), the fourth resistor (R4), the first resistor (R1), the fifth resistor (R5), the second operational amplifier (U1-B) and the fifth capacitor (C5) constitute a second group of low-end current detection circuits.

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