Vehicle-mounted instrument power supply circuit

Abstract

The utility model provides a vehicle-mounted instrument power supply circuit, which comprises a primary power supply module and a secondary power supply module, and is characterized in that the primary power supply module comprises a first sub power supply circuit of the primary power supply module and a first sub power supply circuit additional circuit of the primary power supply module; a first sub power supply circuit of the first-stage power supply module reduces the initial power supply voltage into a first-stage sub power supply, and a first sub power supply circuit additional circuit of the first-stage power supply module reduces the initial power supply voltage into a second-stage sub power supply; the secondary power supply module comprises a first power supply sub-circuit of the secondary power supply module, a second power supply sub-circuit of the secondary power supply module and a third power supply sub-circuit of the secondary power supply module; the first sub power supply circuit of the second-stage power supply module reduces the voltage of the first-stage sub power supply into a third-stage sub power supply; the second sub power supply circuit of the second-stage power supply module reduces the voltage of the first-stage sub power supply into a fourth-stage sub power supply, and the third sub power supply circuit of the second-stage power supply module reduces the voltage of the first-stage sub power supply into the fourth-stage sub power supply. According to the utility model, various power supply voltage outputs can be provided, and the energy consumption is reduced by optimizing the circuit design.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted instruments, in particular to a vehicle-mounted instrument power supply circuit. Background Art

[0002] Modern vehicle-mounted instrument systems are complex and diverse, including various components such as sensors, controllers, and display screens. These components often have different requirements for the power supply voltage, and the traditional single power supply voltage output can no longer meet this diverse demand; moreover, the traditional power conversion circuit may have problems such as low conversion efficiency and high energy consumption. Content of the Utility Model

[0003] The utility model aims to solve at least the technical problems existing in the prior art, and particularly innovatively provides a vehicle-mounted instrument power supply circuit.

[0004] To achieve the above object of the utility model, the utility model provides a vehicle-mounted instrument power supply circuit, including: a primary power module and a secondary power module. The primary power module includes a first sub-power supply circuit of the primary power module and an additional circuit of the first sub-power supply circuit of the primary power module. The first sub-power supply circuit of the primary power module steps down the initial power supply voltage +VBATT to the primary sub-power supply +5VSW, and the additional circuit of the first sub-power supply circuit of the primary power module steps down the initial power supply voltage +VBATT to the secondary sub-power supply +5VCAN.

[0005] The secondary power module includes a first sub-power supply circuit of the secondary power module, a second sub-power supply circuit of the secondary power module, and a third sub-power supply circuit of the secondary power module. The first sub-power supply circuit of the secondary power module steps down the primary sub-power supply +5VSW to the tertiary sub-power supply +3.3VSW. The second sub-power supply circuit of the secondary power module steps down the primary sub-power supply +5VSW to the quaternary sub-power supply +1.8V, and the third sub-power supply circuit of the secondary power module steps down the primary sub-power supply +5VSW to the quaternary sub-power supply +1.2V.

[0006] Further, the primary power module further includes a second sub-power supply circuit of the primary power module;

[0007] The second sub-power supply circuit of the primary power module steps down the initial power supply voltage +VBATT to the fifth-level sub-power supply CAMPOW +8V;

[0008] Or, the second sub-power supply circuit of the primary power module steps down the initial power supply voltage +VBATT to the fifth-level sub-power supply CAMPOW +8V and the sixth-level sub-power supply TUNER_RF.

[0009] Further, the first sub-power supply circuit of the primary power module includes a power chip U2:

[0010] The self - boosting terminal BOOT of the power supply chip U2 is connected to the first terminal of the resistor R21. The second terminal of the resistor R21 is connected to the first terminal of the capacitor C17. The second terminal of the capacitor C17 is connected to the negative electrode of the diode D9, the first terminal of the resistor R22, the switch control terminal SW of U2, and the first terminal of the inductor L1. The negative electrode of the diode D9 is connected to the power supply ground. The second terminal of the resistor R22 is connected to the first terminal of the capacitor C19, and the second terminal of the capacitor C19 is connected to the power supply ground.

[0011] The second terminal of the inductor L1 is connected to the first terminals of the capacitors C20, C21, C22, C23, and the first terminal of the resistor R23. The second terminal of the inductor L1 outputs the power supply +5VSW. The second terminals of the capacitors C20, C21, C22, C23 are connected to the power supply ground.

[0012] The output voltage feedback terminal FB of the power supply chip U2, the second terminal of the resistor R23, and the first terminal of the resistor R24 are connected. The second terminal of the resistor R24 is connected to the power supply ground.

[0013] The ground terminal GND of the power supply chip U2 is connected to the power supply ground.

[0014] The soft - start terminal SS of the power supply chip U2 is connected to the first terminal of the capacitor C18, and the second terminal of the capacitor C18 is connected to the power supply ground.

[0015] The power input terminal VIN of the power supply chip U2 is connected to the first terminals of the capacitors C14, C15, C16, and the first terminal of the resistor R18. The second terminals of the capacitors C14, C15, C16 are connected to the power supply ground. The second terminal of the resistor R18 is connected to the power supply +VBATT.

[0016] The enable terminal EN of the power supply chip U2 is connected to the first terminals of the resistor R19, the capacitor C13, and the first terminal of the resistor R16. The second terminal of the resistor R16 is connected to the enable terminal of the MCU chip for controlling the power supply chip. The second terminal of the capacitor C13 is connected to the power supply ground, and the second terminal of the resistor R19 is connected to the power supply ground.

[0017] The frequency control terminal RT / CLK of the power supply chip U2 is connected to the first terminal of the resistor R20, and the second terminal of the resistor R20 is connected to the power supply ground.

[0018] The additional circuit of the first sub - power supply circuit of the primary power module includes the power supply chip U11:

[0019] The power input terminal VIN of the power supply chip U11 is connected to the negative electrode of the diode D5, the positive electrode of the polarized capacitor C7, and the first terminal of the capacitor C8. The negative electrode of the polarized capacitor C7 and the second terminal of the capacitor C8 are respectively connected to the power supply ground; the positive electrode of the diode D5 is connected to the power supply +VBATT;

[0020] The power output terminal OUT of the power supply chip U11 is connected to the first terminal of the capacitor C9, the first terminal of the capacitor C166, and the power output terminal OUT of the power supply chip U11 outputs the power supply +5VCAN; the second terminal of the capacitor C9 and the second terminal of the capacitor C166 are connected to the power supply ground;

[0021] The ground terminal GND of the power supply chip U11 is connected to the power supply ground.

[0022] Further, when the vehicle instrument is in the sleep state, it is judged whether the power supply +5VSW output by the power supply chip U2 meets the static low-power consumption requirements in the sleep state. If it meets the requirements, the first sub-power supply circuit of the primary power module works, and at this time, the power supply +5VCAN output by the power supply chip U2 obtains the power supply +5VSW through the resistor R3; if it does not meet the requirements, the additional circuit of the first sub-power supply circuit of the primary power module works; at this time, the power supply +5VCAN output by the power supply chip U11 obtains the power supply +5VSW through the resistor R3.

[0023] Further, the first sub-power supply circuit of the secondary power module includes:

[0024] The power input terminal VIN of the power supply chip U3, the first terminal of the resistor R25, the first terminal of the resistor R101, the first terminal of the capacitor C24, and the first terminal of the capacitor C26 are connected to the power supply +5VSW; the second terminal of the capacitor C24 and the second terminal of the capacitor C26 are connected to the power supply ground; the second terminal of the resistor R25 is connected to the power supply indication terminal PG of the power supply chip U3; the second terminal of the resistor R101 is connected to the first terminal of the capacitor C37 and the enable terminal EN of the power supply chip U3; the second terminal of the capacitor C37 is connected to the power supply ground;

[0025] The ground terminal GND of the power supply chip U3 is connected to the power supply ground;

[0026] The switching output terminal SW of the power supply chip U3 is connected to the first terminal of the inductor L2, and the second terminal of the inductor L2 is connected to the power output terminal VOUT of the power supply chip U3, the first terminal of the resistor RO3, the first terminal of the capacitor C30, the first terminal of the capacitor C34, and the first terminal of the capacitor C35; the power output terminal VOUT of the power supply chip U3 outputs the power supply +3.3VSW (3.3V); the second terminal of the capacitor C34 and the second terminal of the capacitor C35 are connected to the power supply ground;

[0027] The feedback terminal FB of the power supply chip U3 is connected to the second terminal of the resistor RO3, the second terminal of the capacitor C30, and the first terminal of the resistor RO1; the second terminal of the resistor RO1 is connected to the power supply ground;

[0028] The soft start terminal SS of the power supply chip U3 is connected to the first terminal of the capacitor C28, and the second terminal of the capacitor C28 is connected to the power supply ground.

[0029] Furthermore, the second sub-power supply circuit of the secondary power supply module includes:

[0030] The power input terminal VIN of the power supply chip U5, the first terminal of the resistor R27, the enable terminal EN of the power supply chip U5, the first terminal of the capacitor C36, and the first terminal of the capacitor C1 are connected to the power supply +5VSW; the second terminal of the capacitor C36 and the second terminal of the capacitor C1 are connected to the power supply ground; the second terminal of the resistor R27 is connected to the power supply indication terminal PG of the power supply chip U5;

[0031] The ground terminal GND of the power supply chip U5 is connected to the power supply ground;

[0032] The switching output terminal SW of the power supply chip U5 is connected to the first terminal of the inductor L4, and the second terminal of the inductor L4 is connected to the power output terminal VOUT of the power supply chip U5, the first terminal of the resistor RO6, the first terminal of the capacitor C39, the first terminal of the capacitor C32, and the first terminal of the capacitor C41; the power output terminal VOUT of the power supply chip U5 outputs the power supply +1.8V; the second terminal of the capacitor C32 and the second terminal of the capacitor C41 are connected to the power supply ground;

[0033] The feedback terminal FB of the power supply chip U5 is connected to the second terminal of the resistor RO6, the second terminal of the capacitor C39, and the first terminal of the resistor RO5; the second terminal of the resistor RO5 is connected to the power supply ground;

[0034] The soft start terminal SS of the power supply chip U5 is connected to the first terminal of the capacitor C38, and the second terminal of the capacitor C38 is connected to the power supply ground.

[0035] Furthermore, the third sub-power supply circuit of the secondary power supply module includes:

[0036] The power input terminal VIN of the power supply chip U4, the first terminal of the resistor R26, the enable terminal EN of the power supply chip U4, the first terminal of the capacitor C25, and the first terminal of the capacitor C27 are connected to the power supply +5VSW; the second terminal of the capacitor C25 and the second terminal of the capacitor C27 are connected to the power supply ground; the second terminal of the resistor R26 is connected to the power supply indication terminal PG of the power supply chip U4;

[0037] The ground terminal GND of the power supply chip U4 is connected to the power supply ground;

[0038] The switching output terminal SW of the power supply chip U4 is connected to the first end of the inductor L3, and the second end of the inductor L3 is connected to the power output terminal VOUT of the power supply chip U4, the first end of the resistor RO4, the first end of the capacitor C31, the first end of the capacitor C33, and the first end of the capacitor C40; the power output terminal VOUT of the power supply chip U4 outputs a power supply of +1.2V; the second ends of the capacitor C33 and the capacitor C40 are connected to the power ground;

[0039] The feedback terminal FB of the power supply chip U4 is connected to the second end of the resistor RO4, the second end of the capacitor C31, and the first end of the resistor RO2; the second end of the resistor RO2 is connected to the power ground;

[0040] The soft start terminal SS of the power supply chip U4 is connected to the first end of the capacitor C29, and the second end of the capacitor C29 is connected to the power ground.

[0041] Furthermore, the second sub-power supply circuit of the primary power module includes: the power input terminal IN of the power supply chip U8, the first ends of the capacitor CD1 and the capacitor C91 are connected to the power supply +VBATT, and the second ends of the capacitor CD1 and the capacitor C91 are connected to the power ground;

[0042] The first enable terminal EN1 of the power supply chip U8 is connected to the first end of the resistor RO9, and the second end of the resistor RO9 is connected to the FM enable control terminal of the MCU chip,

[0043] The second enable terminal EN2 of the power supply chip U8 is connected to the first end of the resistor RO18, and the second end of the resistor RO18 is connected to the camera enable control terminal of the MCU chip;

[0044] The power supply terminal VCC of the power supply chip U8 is connected to the first end of the capacitor CO8,

[0045] The first current sensing output terminal SENSE1 of the power supply chip U8 is connected to the first end of the resistor RO7 and the first end of the capacitor CO6, and the second end of the resistor RO7, the second end of the capacitor CO6, and the second end of the capacitor CO8 are connected to the power ground;

[0046] The second current sensing output terminal SENSE2 of the power supply chip U8 is connected to the first end of the resistor RO8 and the first end of the capacitor CO7; the second end of the resistor RO8 and the second end of the capacitor CO7 are connected to the power ground;

[0047] The enable control terminal SENSE_SEL of the power supply chip U8 is connected to the first end of the resistor RO10, and the second end of the resistor RO10 is connected to the power ground,

[0048] The current sensing enable terminal SENSE_EN of the power supply chip U8 is connected to the first end of the resistor RO11, and the second end of the resistor RO11 is connected to the power ground,

[0049] The first power output terminal OUT1 of the power supply chip U8 is connected to the first end of the inductor LD1 and the first end of the resistor RO13. The second end of the inductor LD1 is connected to the first end of the capacitor CD2, the first end of the capacitor CD3, and the first end of the inductor LD2. The second end of the inductor LD2 outputs the power supply TUNER_RF. The second ends of the capacitor CD2 and the capacitor CD3 are connected to the power ground.

[0050] The first feedback terminal FB1 of the power supply chip U8 is connected to the second end of the resistor RO13 and the first end of the resistor RO15. The second end of the resistor RO15, the first ends of the resistor RO17, the resistor RO16, and the resistor RO14 are connected to the power ground.

[0051] The first power output terminal OUT2 of the power supply chip U8 outputs the power supply CAMPOW + 8V and is connected to the first end of the resistor RO12, the first end of the capacitor CD6, and the first end of the capacitor CD5. The second ends of the capacitor CD6 and the capacitor CD5 are connected to the power ground.

[0052] The first feedback terminal FB2 of the power supply chip U8 is connected to the second end of the resistor RO12 and the second end of the resistor RO17.

[0053] The ground terminal GND of the power supply chip U8 is connected to the power ground.

[0054] The first current limiting terminal LIM1 of the power supply chip U8 is connected to the second end of the resistor RO16.

[0055] The second current limiting terminal LIM2 of the power supply chip U8 is connected to the second end of the resistor RO14.

[0056] In summary, due to the adoption of the above technical solutions, the utility model can provide multiple power voltage outputs, effectively solving the problem that vehicle-mounted instruments require multiple power voltages; by optimizing the circuit design, the power conversion efficiency is improved and the energy consumption is reduced.

[0057] The additional aspects and advantages of the utility model will be partly given in the following description, partly becoming obvious from the following description, or understood through the practice of the utility model. Description of the Drawings

[0058] The above and / or additional aspects and advantages of the utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0059] Figure 1 is a schematic diagram of the circuit structure of the utility model.

[0060] Figure 2It is a schematic diagram of the connection of the first sub-power supply circuit of the primary power supply module of the present utility model.

[0061] Figure 3 It is a schematic diagram of the connection of the additional circuit of the first sub-power supply circuit of the primary power supply module of the present utility model.

[0062] Figure 4 It is a schematic diagram of the connection of the first sub-power supply circuit of the secondary power supply module of the present utility model.

[0063] Figure 5 It is a schematic diagram of the connection of the second sub-power supply circuit of the secondary power supply module of the present utility model.

[0064] Figure 6 It is a schematic diagram of the connection of the third sub-power supply circuit of the secondary power supply module of the present utility model.

[0065] Figure 7 It is a schematic diagram of the connection of the second sub-power supply circuit of the primary power supply module of the present utility model. Detailed implementation manners

[0066] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0067] The circuit structure of the present utility model is as Figure 1 shown. A vehicle instrument power supply circuit includes: a primary power supply module and a secondary power supply module. The primary power supply module includes a first sub-power supply circuit of the primary power supply module and a second sub-power supply circuit of the primary power supply module; the first sub-power supply circuit of the primary power supply module further includes an additional circuit of the first sub-power supply circuit of the primary power supply module.

[0068] The secondary power supply module includes a first sub-power supply circuit of the secondary power supply module, a second sub-power supply circuit of the secondary power supply module, and a third sub-power supply circuit of the secondary power supply module; the power input ends of the first sub-power supply circuit, the second sub-power supply circuit of the secondary power supply module, and the third sub-power supply circuit of the secondary power supply module are all connected to the power output end of the first sub-power supply circuit of the primary power supply module.

[0069] The specific circuit structure is as Figures 2 to 7 shown.

[0070] The primary power supply module includes power supply chips U2 and U11. The primary power supply module converts the power supply +VBATT (12V) into power supplies +5VSW (5V) and +5VCAN (5V); when the power supply +5VSW output by the power supply chip U2 meets the static low power consumption in the sleep state, the power supply chip U11 is not required, and the power supply +5VSW is connected through the resistor R3 to output the power supply +5VCAN. If it does not meet the requirement, the power supply chip U11 is adopted, and at this time there is no resistor R3; the power supply chip U11 converts the power supply +VBATT (12V) into the power supply +5VCAN (5V).

[0071] The power supply chip U2 is used to supply power to the CAN chip, and the power supply chip U11 is used to supply power to the MCU and the CAN chip.

[0072] The self-boost terminal BOOT of the power supply chip U2 is connected to the first end of the resistor R21, the second end of the resistor R21 is connected to the first end of the capacitor C17, and the second end of the capacitor C17 is connected to the negative electrode of the diode D9, the first end of the resistor R22, the switch control terminal SW of U2, and the first end of the inductor L1; the negative electrode of the diode D9 is connected to the power supply ground; the second end of the resistor R22 is connected to the first end of the capacitor C19, and the second end of the capacitor C19 is connected to the power supply ground;

[0073] The second end of the inductor L1 is connected to the first ends of the capacitors C20, C21, C22, C23, and the first end of the resistor R23, and the second end of the inductor L1 outputs the power supply +5VSW (5V); the second ends of the capacitors C20, C21, C22, C23 are connected to the power supply ground; among them, the capacitor C23 is a polarized capacitor.

[0074] The output voltage feedback terminal FB of the power supply chip U2, the second end of the resistor R23, and the first end of the resistor R24 are connected, and the second end of the resistor R24 is connected to the power supply ground;

[0075] The ground terminal GND of the power supply chip U2 is connected to the power supply ground;

[0076] The soft start terminal SS of the power supply chip U2 is connected to the first end of the capacitor C18, and the second end of the capacitor C18 is connected to the power supply ground;

[0077] The power input terminal VIN of the power supply chip U2 is connected to the first ends of the capacitors C14, C15, C16, and the first end of the resistor R18; the second ends of the capacitors C14, C15, C16 are connected to the power supply ground; the second end of the resistor R18 is connected to the power supply +VBATT;

[0078] The enable terminal EN of the power supply chip U2 is connected to the first terminal of the resistor R19, the first terminal of the capacitor C13, and the first terminal of the resistor R16; the second terminal of the resistor R16 is connected to the enable terminal of the MCU chip for controlling the power supply chip U2. The second terminal of the capacitor C13 is connected to the power ground, and the second terminal of the resistor R19 is connected to the power ground;

[0079] The frequency control terminal RT / CLK of the power supply chip U2 is connected to the first terminal of the resistor R20, and the second terminal of the resistor R20 is connected to the power ground.

[0080] The model of the power supply chip U2 is SCT2432STER.

[0081] The power input terminal VIN of the power supply chip U11 is connected to the negative electrode of the diode D5, the positive electrode of the polarized capacitor C7, and the first terminal of the capacitor C8; the negative electrode of the polarized capacitor C7 and the second terminal of the capacitor C8 are respectively connected to the power ground; the positive electrode of the diode D5 is connected to the power +VBATT;

[0082] The power output terminal OUT of the power supply chip U11 is connected to the first terminal of the capacitor C9, the first terminal of the capacitor C166, and the first terminal of the resistor R3. The power output terminal OUT of the power supply chip U11 outputs the power +5VCAN; the second terminal of the resistor R3 outputs the power +5VSW; the second terminals of the capacitor C9 and the capacitor C166 are connected to the power ground;

[0083] The ground terminal GND of the power supply chip U11 is connected to the power ground.

[0084] The model of the power supply chip U11 is SCT71403F50Q

[0085] Then, through the secondary power supply module, the 5V power supply output by the primary power supply module is respectively converted to 3.3V by the power supply chip U3, 1.8V by the power supply chip U5, and 1.2V by the power supply chip U4; it can be used to supply power to the SOC, DSP, FM / AM, Bluetooth wifi module, reverse image CVBS, USB charging management module, etc.

[0086] The power input terminal VIN of the power supply chip U3, the first terminal of the resistor R25, the first terminal of the resistor R101, the first terminal of the capacitor C24, and the first terminal of the capacitor C26 are connected to the power +5VSW; the second terminals of the capacitor C24 and the capacitor C26 are connected to the power ground; the second terminal of the resistor R25 is connected to the power indicator terminal PG of the power supply chip U3; the second terminal of the resistor R101 is connected to the first terminal of the capacitor C37 and the enable terminal EN of the power supply chip U3; the second terminal of the capacitor C37 is connected to the power ground;

[0087] The ground terminal GND of the power supply chip U3 is connected to the power ground;

[0088] The switching output terminal SW of the power supply chip U3 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the power output terminal VOUT of the power supply chip U3, the first end of the resistor RO3, the first end of the capacitor C30, the first end of the capacitor C34, and the first end of the capacitor C35; the power output terminal VOUT of the power supply chip U3 outputs the power supply +3.3VSW (3.3V); the second ends of the capacitor C34 and the capacitor C35 are connected to the power ground;

[0089] The feedback terminal FB of the power supply chip U3 is connected to the second end of the resistor RO3, the second end of the capacitor C30, and the first end of the resistor RO1; the second end of the resistor RO1 is connected to the power ground;

[0090] The soft start terminal SS of the power supply chip U3 is connected to the first end of the capacitor C28, and the second end of the capacitor C28 is connected to the power ground.

[0091] The power input terminal VIN of the power supply chip U5, the first end of the resistor R27, the enable terminal EN of the power supply chip U5, the first end of the capacitor C36, and the first end of the capacitor C1 are connected to the power supply +5VSW; the second ends of the capacitor C36 and the capacitor C1 are connected to the power ground; the second end of the resistor R27 is connected to the power indication terminal PG of the power supply chip U5;

[0092] The ground terminal GND of the power supply chip U5 is connected to the power ground;

[0093] The switching output terminal SW of the power supply chip U5 is connected to the first end of the inductor L4, and the second end of the inductor L4 is connected to the power output terminal VOUT of the power supply chip U5, the first end of the resistor RO6, the first end of the capacitor C39, the first end of the capacitor C32, and the first end of the capacitor C41; the power output terminal VOUT of the power supply chip U5 outputs the power supply +1.8V; the second ends of the capacitor C32 and the capacitor C41 are connected to the power ground;

[0094] The feedback terminal FB of the power supply chip U5 is connected to the second end of the resistor RO6, the second end of the capacitor C39, and the first end of the resistor RO5; the second end of the resistor RO5 is connected to the power ground;

[0095] The soft start terminal SS of the power supply chip U5 is connected to the first end of the capacitor C38, and the second end of the capacitor C38 is connected to the power ground.

[0096] The power input terminal VIN of the power supply chip U4, the first end of the resistor R26, the enable terminal EN of the power supply chip U4, the first end of the capacitor C25, and the first end of the capacitor C27 are connected to the power supply +5VSW; the second ends of the capacitor C25 and the capacitor C27 are connected to the power ground; the second end of the resistor R26 is connected to the power indication terminal PG of the power supply chip U4;

[0097] The ground terminal GND of the power supply chip U4 is connected to the power ground.

[0098] The switching output terminal SW of the power supply chip U4 is connected to the first end of the inductor L3. The second end of the inductor L3 is connected to the power output terminal VOUT of the power supply chip U4, the first end of the resistor RO4, the first end of the capacitor C31, the first end of the capacitor C33, and the first end of the capacitor C40. The power output terminal VOUT of the power supply chip U4 outputs a power supply of +1.2V. The second ends of the capacitor C33 and the capacitor C40 are connected to the power ground.

[0099] The feedback terminal FB of the power supply chip U4 is connected to the second end of the resistor RO4, the second end of the capacitor C31, and the first end of the resistor RO2. The second end of the resistor RO2 is connected to the power ground.

[0100] The soft start terminal SS of the power supply chip U4 is connected to the first end of the capacitor C29, and the second end of the capacitor C29 is connected to the power ground.

[0101] The models of the power supply chips U3, U4, and U5 are SCT2130.

[0102] The models of the power supply chips U3, U4, and U5 are SCT2130.

[0103] The second sub-power supply circuit of the primary power module includes a power supply chip U8, which outputs the power supply TUNER_RF and the power supply CAMPOW +8V:

[0104] The power input terminal IN of the power supply chip U8, the first end of the capacitor CD1, and the first end of the capacitor C91 are connected to the power supply +VBATT, and the second ends of the capacitor CD1 and the capacitor C91 are connected to the power ground.

[0105] The first enable terminal EN1 of the power supply chip U8 is connected to the first end of the resistor RO9, and the second end of the resistor RO9 is connected to the FM enable control terminal of the MCU chip.

[0106] The rated enable terminal EN2 of the power supply chip U8 is connected to the first end of the resistor RO18, and the second end of the resistor RO18 is connected to the camera enable control terminal of the MCU chip.

[0107] The power supply terminal VCC of the power supply chip U8 is connected to the first end of the capacitor CO8.

[0108] The first current sensing output terminal SENSE1 of the power supply chip U8 is connected to the first end of the resistor RO7 and the first end of the capacitor CO6. The second end of the resistor RO7, the second end of the capacitor CO6, and the second end of the capacitor CO8 are connected to the power ground.

[0109] The first current sensing output terminal SENSE2 of the power supply chip U8 is connected to the first terminal of the resistor RO8 and the first terminal of the capacitor CO7; the second terminal of the resistor RO8 and the second terminal of the capacitor CO7 are connected to the power ground;

[0110] The enable control terminal SENSE_SEL of the power supply chip U8 is connected to the first terminal of the resistor RO10, and the second terminal of the resistor RO10 is connected to the power ground,

[0111] The current sensing enable terminal SENSE_EN of the power supply chip U8 is connected to the first terminal of the resistor RO11, and the second terminal of the resistor RO11 is connected to the power ground,

[0112] The first power output terminal OUT1 of the power supply chip U8 is connected to the first terminal of the inductor LD1 and the first terminal of the resistor RO13. The second terminal of the inductor LD1 is connected to the first terminal of the capacitor CD2, the first terminal of the capacitor CD3, and the first terminal of the inductor LD2; the second terminal of the inductor LD2 outputs the power supply TUNER_RF; the second terminals of the capacitor CD2 and the capacitor CD3 are connected to the power ground;

[0113] The first feedback terminal FB1 of the power supply chip U8 is connected to the second terminal of the resistor RO13 and the first terminal of the resistor RO15. The second terminal of the resistor RO15, the first terminal of the resistor RO17, the first terminal of the resistor RO16, and the first terminal of the resistor RO14 are connected to the power ground;

[0114] The first power output terminal OUT2 of the power supply chip U8 outputs the power supply CAMPOW + 8V and is connected to the first terminal of the resistor RO12, the first terminal of the capacitor CD6, and the first terminal of the capacitor CD5; the second terminals of the capacitor CD6 and the capacitor CD5 are connected to the power ground;

[0115] The first feedback terminal FB2 of the power supply chip U8 is connected to the second terminal of the resistor RO12 and the second terminal of the resistor RO17;

[0116] The ground terminal GND of the power supply chip U8 is connected to the power ground;

[0117] The first current limiting terminal LIM1 of the power supply chip U8 is connected to the second terminal of the resistor RO16;

[0118] The second current limiting terminal LIM2 of the power supply chip U8 is connected to the second terminal of the resistor RO14.

[0119] The model of the power supply chip U8 is TPS7B7702.

[0120] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle instrument power supply circuit, characterized in that Comprising: A primary power supply module and a secondary power supply module. The primary power supply module includes a first sub-power supply circuit of the primary power supply module and an additional circuit of the first sub-power supply circuit of the primary power supply module. The first sub-power supply circuit of the primary power supply module steps down the initial power supply voltage (Power + VBATT) to a primary sub-power supply (Power + 5VSW), and the additional circuit of the first sub-power supply circuit of the primary power supply module steps down the initial power supply voltage (Power + VBATT) to a secondary sub-power supply (Power + 5VCAN). The secondary power supply module includes a first sub-power supply circuit of the secondary power supply module, a second sub-power supply circuit of the secondary power supply module, and a third sub-power supply circuit of the secondary power supply module. The first sub-power supply circuit of the secondary power supply module steps down the primary sub-power supply (Power + 5VSW) to a tertiary sub-power supply (+3.3VSW). The second sub-power supply circuit of the secondary power supply module steps down the primary sub-power supply (Power + 5VSW) to a quaternary sub-power supply (+1.8V), and the third sub-power supply circuit of the secondary power supply module steps down the primary sub-power supply (Power + 5VSW) to a quaternary sub-power supply (+1.2V).

2. The vehicle instrument power supply circuit according to claim 1, characterized in that, The primary power supply module further includes a second sub-power supply circuit of the primary power supply module; The second sub-power supply circuit of the primary power supply module steps down the initial power supply voltage (Power + VBATT) to a fifth sub-power supply (CAMPOW + 8V); Or, the second sub-power supply circuit of the primary power supply module steps down the initial power supply voltage (Power + VBATT) to a fifth sub-power supply (CAMPOW + 8V) and a sixth sub-power supply (TUNER_RF).

3. The vehicle instrument power supply circuit according to claim 1, characterized in that, The first sub-power supply circuit of the primary power supply module includes a power supply chip U2: The self-boost terminal BOOT of the power supply chip U2 is connected to the first end of the resistor R21. The second end of the resistor R21 is connected to the first end of the capacitor C17. The second end of the capacitor C17 is connected to the negative electrode of the diode D9, the first end of the resistor R22, the switch control terminal SW of U2, and the first end of the inductor L1. The negative electrode of the diode D9 is connected to the power supply ground. The second end of the resistor R22 is connected to the first end of the capacitor C19. The second end of the capacitor C19 is connected to the power supply ground; The second end of the inductor L1 is connected to the first ends of the capacitor C20, the capacitor C21, the capacitor C22, the capacitor C23, and the first end of the resistor R23. The second end of the inductor L1 outputs Power + 5VSW. The second ends of the capacitor C20, the capacitor C21, the capacitor C22, and the capacitor C23 are connected to the power supply ground; The output voltage feedback terminal FB of the power supply chip U2, the second end of the resistor R23, and the first end of the resistor R24 are connected. The second end of the resistor R24 is connected to the power supply ground; The ground terminal GND of the power supply chip U2 is connected to the power supply ground; The soft start terminal SS of the power supply chip U2 is connected to the first end of the capacitor C18. The second end of the capacitor C18 is connected to the power supply ground; The power input terminal VIN of the power supply chip U2 is connected to the first terminal of the capacitor C14, the first terminal of the capacitor C15, the first terminal of the capacitor C16, and the first terminal of the resistor R18; the second terminals of the capacitor C14, the capacitor C15, and the capacitor C16 are connected to the power ground; the second terminal of the resistor R18 is connected to the power supply +VBATT; The enable terminal EN of the power supply chip U2 is connected to the first terminal of the resistor R19, the first terminal of the capacitor C13, and the first terminal of the resistor R16; the second terminal of the resistor R16 is connected to the enable terminal of the MCU chip, the second terminal of the capacitor C13 is connected to the power ground, and the second terminal of the resistor R19 is connected to the power ground; The frequency control terminal RT / CLK of the power supply chip U2 is connected to the first terminal of the resistor R20, and the second terminal of the resistor R20 is connected to the power ground; The first sub-power supply circuit additional circuit of the primary power module includes the power supply chip U11: The power input terminal VIN of the power supply chip U11 is connected to the negative electrode of the diode D5, the positive electrode of the polarized capacitor C7, and the first terminal of the capacitor C8; the negative electrode of the polarized capacitor C7 and the second terminal of the capacitor C8 are respectively connected to the power ground; the positive electrode of the diode D5 is connected to the power supply +VBATT; The power output terminal OUT of the power supply chip U11 is connected to the first terminal of the capacitor C9, the first terminal of the capacitor C166, and the power output terminal OUT of the power supply chip U11 outputs the power supply +5VCAN; the second terminals of the capacitor C9 and the capacitor C166 are connected to the power ground; The ground terminal GND of the power supply chip U11 is connected to the power ground.

4. The vehicle instrument power supply circuit according to claim 3, characterized in that, When the vehicle instrument is in the sleep state, it is judged whether the power supply +5VSW output by the power supply chip U2 meets the static low-power consumption requirements in the sleep state. If it meets the requirements, the first sub-power supply circuit of the primary power module works, and at this time, the power supply +5VCAN output by the power supply chip U2 passes through the resistor R3 to obtain the power supply +5VSW; if it does not meet the requirements, the first sub-power supply circuit additional circuit of the primary power module works; at this time, the power supply +5VCAN output by the power supply chip U11 passes through the resistor R3 to obtain the power supply +5VSW.

5. The vehicle instrument power supply circuit according to claim 1, wherein, The first sub-power supply circuit of the secondary power module includes: The power input terminal VIN of the power supply chip U3, the first terminal of the resistor R25, the first terminal of the resistor R101, the first terminal of the capacitor C24, and the first terminal of the capacitor C26 are connected to the power supply +5VSW; the second terminals of the capacitor C24 and the capacitor C26 are connected to the power ground; the second terminal of the resistor R25 is connected to the power indicator terminal PG of the power supply chip U3; the second terminal of the resistor R101 is connected to the first terminal of the capacitor C37 and the enable terminal EN of the power supply chip U3; the second terminal of the capacitor C37 is connected to the power ground; The ground terminal GND of the power supply chip U3 is connected to the power ground; The switching output terminal SW of the power supply chip U3 is connected to the first end of the inductor L2. The second end of the inductor L2 is connected to the power output terminal VOUT of the power supply chip U3, the first end of the resistor RO3, the first end of the capacitor C30, the first end of the capacitor C34, and the first end of the capacitor C35. The power output terminal VOUT of the power supply chip U3 outputs the power +3.3VSW (3.3V). The second ends of the capacitor C34 and the capacitor C35 are connected to the power ground. The feedback terminal FB of the power supply chip U3 is connected to the second end of the resistor RO3, the second end of the capacitor C30, and the first end of the resistor RO1. The second end of the resistor RO1 is connected to the power ground. The soft start terminal SS of the power supply chip U3 is connected to the first end of the capacitor C28. The second end of the capacitor C28 is connected to the power ground.

6. The vehicle instrument power supply circuit according to claim 1, characterized in that, The second sub-power supply circuit of the secondary power supply module includes: The power input terminal VIN of the power supply chip U5, the first end of the resistor R27, the enable terminal EN of the power supply chip U5, the first end of the capacitor C36, and the first end of the capacitor C1 are connected to the power +5VSW. The second ends of the capacitor C36 and the capacitor C1 are connected to the power ground. The second end of the resistor R27 is connected to the power indication terminal PG of the power supply chip U5. The ground terminal GND of the power supply chip U5 is connected to the power ground. The switching output terminal SW of the power supply chip U5 is connected to the first end of the inductor L4. The second end of the inductor L4 is connected to the power output terminal VOUT of the power supply chip U5, the first end of the resistor RO6, the first end of the capacitor C39, the first end of the capacitor C32, and the first end of the capacitor C41. The power output terminal VOUT of the power supply chip U5 outputs the power +1.8V. The second ends of the capacitor C32 and the capacitor C41 are connected to the power ground. The feedback terminal FB of the power supply chip U5 is connected to the second end of the resistor RO6, the second end of the capacitor C39, and the first end of the resistor RO5. The second end of the resistor RO5 is connected to the power ground. The soft start terminal SS of the power supply chip U5 is connected to the first end of the capacitor C38. The second end of the capacitor C38 is connected to the power ground.

7. The vehicle instrument power supply circuit according to claim 1, characterized in that, The third sub-power supply circuit of the secondary power supply module includes: The power input terminal VIN of the power supply chip U4, the first end of the resistor R26, the enable terminal EN of the power supply chip U4, the first end of the capacitor C25, and the first end of the capacitor C27 are connected to the power +5VSW. The second ends of the capacitor C25 and the capacitor C27 are connected to the power ground. The second end of the resistor R26 is connected to the power indication terminal PG of the power supply chip U4. The ground terminal GND of the power supply chip U4 is connected to the power ground. The switching output terminal SW of the power supply chip U4 is connected to the first end of the inductor L3. The second end of the inductor L3 is connected to the power output terminal VOUT of the power supply chip U4, the first end of the resistor RO4, the first end of the capacitor C31, the first end of the capacitor C33, and the first end of the capacitor C40. The power output terminal VOUT of the power supply chip U4 outputs the power +1.2V. The second ends of the capacitor C33 and the capacitor C40 are connected to the power ground. The feedback terminal FB of the power supply chip U4 is connected to the second terminal of the resistor RO4, the second terminal of the capacitor C31, and the first terminal of the resistor RO2; the second terminal of the resistor RO2 is connected to the power supply ground; The soft start terminal SS of the power supply chip U4 is connected to the first terminal of the capacitor C29, and the second terminal of the capacitor C29 is connected to the power supply ground.

8. The vehicle instrument power supply circuit according to claim 1, wherein The second sub-power supply circuit of the primary power supply module includes: the power input terminal IN of the power supply chip U8, the first terminal of the capacitor CD1, and the first terminal of the capacitor C91 are connected to the power supply +VBATT, and the second terminal of the capacitor CD1 and the second terminal of the capacitor C91 are connected to the power supply ground; The first enable terminal EN1 of the power supply chip U8 is connected to the first terminal of the resistor RO9, and the second terminal of the resistor RO9 is connected to the FM enable control terminal of the MCU chip. The rated enable terminal EN2 of the power supply chip U8 is connected to the first terminal of the resistor RO18, and the second terminal of the resistor RO18 is connected to the camera enable control terminal of the MCU chip; The power supply terminal VCC of the power supply chip U8 is connected to the first terminal of the capacitor CO8. The first current sensing output terminal SENSE1 of the power supply chip U8 is connected to the first terminal of the resistor RO7 and the first terminal of the capacitor CO6, and the second terminal of the resistor RO7, the second terminal of the capacitor CO6, and the second terminal of the capacitor CO8 are connected to the power supply ground; The first current sensing output terminal SENSE2 of the power supply chip U8 is connected to the first terminal of the resistor RO8 and the first terminal of the capacitor CO7; the second terminal of the resistor RO8 and the second terminal of the capacitor CO7 are connected to the power supply ground; The enable control terminal SENSE_SEL of the power supply chip U8 is connected to the first terminal of the resistor RO10, and the second terminal of the resistor RO10 is connected to the power supply ground. The current sensing enable terminal SENSE_EN of the power supply chip U8 is connected to the first terminal of the resistor RO11, and the second terminal of the resistor RO11 is connected to the power supply ground. The first power output terminal OUT1 of the power supply chip U8 is connected to the first terminal of the inductor LD1 and the first terminal of the resistor RO13. The second terminal of the inductor LD1 is connected to the first terminal of the capacitor CD2, the first terminal of the capacitor CD3, and the first terminal of the inductor LD2; the second terminal of the inductor LD2 outputs the power supply TUNER_RF; the second terminal of the capacitor CD2 and the second terminal of the capacitor CD3 are connected to the power supply ground; The first feedback terminal FB1 of the power supply chip U8 is connected to the second terminal of the resistor RO13 and the first terminal of the resistor RO15, and the second terminal of the resistor RO15, the first terminal of the resistor RO17, the first terminal of the resistor RO16, and the first terminal of the resistor RO14 are connected to the power supply ground; The first power output terminal OUT2 of the power supply chip U8 outputs the power supply CAMPOW +8V and is connected to the first terminal of the resistor RO12, the first terminal of the capacitor CD6, and the first terminal of the capacitor CD5; the second terminal of the capacitor CD6 and the second terminal of the capacitor CD5 are connected to the power supply ground; The first feedback terminal FB2 of the power supply chip U8 is connected to the second terminal of the resistor RO12 and the second terminal of the resistor RO17; The ground terminal GND of the power supply chip U8 is connected to the power supply ground; The first current limiting terminal LIM1 of the power supply chip U8 is connected to the second terminal of the resistor RO16; The second current limiting terminal LIM2 of the power supply chip U8 is connected to the second terminal of the resistor RO14.

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