CN214057436U - Vehicle-mounted ECU system and power supply circuit thereof - Google Patents
Vehicle-mounted ECU system and power supply circuit thereof Download PDFInfo
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- CN214057436U CN214057436U CN202022717460.XU CN202022717460U CN214057436U CN 214057436 U CN214057436 U CN 214057436U CN 202022717460 U CN202022717460 U CN 202022717460U CN 214057436 U CN214057436 U CN 214057436U
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Abstract
The embodiment of the utility model provides an on-vehicle ECU system and supply circuit thereof, supply circuit includes: the first voltage reduction module and the second voltage reduction module; the output end of the second voltage reduction module is divided into a first branch and a second branch, the output ends of the first branch and the first voltage reduction module are connected through a switch circuit module to form a first power supply port, the second branch forms a second power supply port, the switch circuit module comprises a first MOS tube Q1, a second MOS tube Q2 and a triode Q3, and the input end, the output end and the control end of the first MOS tube Q1 are respectively connected with the output end, the first power supply port and the first branch of the first voltage reduction module and are grounded through a first resistor R1; the input end and the output end of the second MOS transistor Q2 are connected to the first branch circuit and the first power supply port, and are respectively connected to the control end of the second MOS transistor Q2 and the input end of the triode Q3 through a second resistor R2; the control terminal and the output terminal of the transistor Q3 are connected to the first branch and the ground, respectively. The embodiment can effectively improve the power supply efficiency and stably supply power.
Description
Technical Field
The embodiment of the utility model provides a relate to on-vehicle ECU technical field, especially relate to an on-vehicle ECU system and supply circuit thereof.
Background
In current on-vehicle ECU system, generally adopt the supply circuit who comprises first voltage reduction module and second voltage reduction module to supply power for first control module and other power consumption modules in the on-vehicle ECU, for realizing that on-vehicle ECU first control module mainly adopts second voltage reduction module and adopts first voltage reduction module to supply power when low-power consumption or standby mode when normal operating, specific supply circuit includes: the first voltage reduction module is connected with an external power supply and used for converting the voltage output by the external power supply into a first preset voltage and then outputting the first preset voltage; the second voltage reduction module is respectively connected with the external power supply and the first control module of the vehicle-mounted ECU and is used for converting the voltage output by the external power supply into a second preset voltage under the control of the first control module and then outputting the second preset voltage; the output end of the second voltage reduction module is divided into a first branch and a second branch, the first branch is connected with the output end of the first voltage reduction module and then forms a first power supply port for supplying power to the first control module, the second branch is separately formed as a second power supply port for supplying power to a power utilization module except the first control module in the vehicle-mounted ECU, the output end of the first voltage reduction module is connected to the first power supply port through a first switch, the first branch is connected to the first power supply port through a second switch, and the first switch and the second switch are usually low-voltage-difference diodes to achieve mutual isolation between the power supply ports.
However, the diode still has circuit loss when passing a large current, the power supply efficiency of the circuit is low, and the power of the first control module cannot be accurately supplied after the circuit loss; in addition, in order to ensure that the power supply of the first control module mainly comes from the second voltage reduction module during normal operation, when a circuit is designed, usually, the second predetermined voltage (for example, 5.2V) output by the second voltage reduction module is slightly larger than the first predetermined voltage (for example, 5V) output by the first voltage reduction module, but the second voltage reduction module cannot supply power to other power utilization modules of the vehicle-mounted ECU, which need the power supply of the first predetermined voltage, and even the circuit is damaged.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem who solves lies in, provides an on-vehicle ECU supply circuit, can effectively improve power supply efficiency and stably supply power.
The embodiment of the utility model provides a technical problem who further solves provides an on-vehicle ECU system, can effectively improve power supply efficiency and stably supply power.
In order to solve the technical problem, an embodiment of the utility model provides a following technical scheme: an in-vehicle ECU power supply circuit comprising:
the first voltage reduction module is connected with an external power supply and used for converting the voltage output by the external power supply into a first preset voltage and then outputting the first preset voltage; the second voltage reduction module is respectively connected with the external power supply and the first control module of the vehicle-mounted ECU and is used for converting the voltage output by the external power supply into a second preset voltage under the control of the first control module and then outputting the second preset voltage;
the output end of the second voltage reduction module is divided into a first branch and a second branch, the output ends of the first branch and the first voltage reduction module are connected through a switch circuit module and then form a first power supply port for supplying power to the first control module, the second branch is separately formed into a second power supply port for supplying power to a power utilization module except the first control module in the vehicle-mounted ECU, and the switch circuit module comprises a first MOS tube Q1, a second MOS tube Q2 and a triode Q3, wherein:
the input end of the first MOS tube Q1 is connected with the output end of the first voltage reduction module, the output end of the first MOS tube Q1 is connected with the first power supply port, and the control end of the first MOS tube Q1 is connected with the first branch circuit and is grounded through a first resistor R1;
the input end of the second MOS tube Q2 is connected with the first branch, the output end of the second MOS tube Q2 is connected with the first power supply port and is respectively connected to the control end of the second MOS tube Q2 and the input end of the triode Q3 through a second resistor R2;
the control end of the triode Q3 is connected with the first branch circuit, and the output end of the triode Q3 is grounded.
Further, the control terminal of the transistor Q3 is connected to the first branch via a third resistor R3.
Further, the first voltage reduction module is a low dropout regulator.
Further, the second voltage reduction module is a DC-DC voltage reduction circuit.
On the other hand, in order to solve the above technical problem, the embodiment of the utility model provides a following technical scheme: an in-vehicle ECU system comprising: the power supply circuit comprises a first control module and a power supply circuit, wherein the power supply circuit is as described in any one of the above, a power input end of the first control module is connected to the first power supply port, a control signal output end of the first control module is connected to a control end of the second buck module to control on and off of the second buck module, and when the second buck module is started, the transistor Q3 and the second MOS transistor Q2 are enabled to be turned on while the first MOS transistor Q1 is disabled, and when the second buck module is turned off, the transistor Q3 and the second MOS transistor Q2 are disabled while the first MOS transistor Q1 is enabled.
Furthermore, the system also comprises a second control module and an audio and video module correspondingly controlled by the second control module, wherein the second control module and the audio and video module are both connected to the second power supply port.
Further, the first control module is an MCU chip, and the second control module is a DSP chip.
After the technical scheme is adopted, the embodiment of the utility model provides an at least, following beneficial effect has: the embodiment of the utility model provides an input through first MOS pipe Q1, output and control end correspond the output of connecting first step-down module, first power supply port and through first resistance R1 ground connection, and second MOS pipe Q2's input corresponds connects first branch road and the output links to each other and is connected to second MOS pipe Q2's control end and triode Q3's input respectively through second resistance R2 with first branch road, triode Q3's control end links to each other with first branch road simultaneously, triode Q3's output ground connection, can effectual realization on-vehicle ECU system adopt the power supply demand of second step-down module and first step-down module respectively under normal operating mode and low-power consumption mode, and first predetermined voltage and second predetermined voltage can be the same also can be different, can both effectively improve power supply efficiency higher, and can effectively stabilize the power supply for other power modules.
Drawings
Fig. 1 is a schematic block diagram of an alternative embodiment of the vehicle-mounted ECU system of the present invention.
Fig. 2 is a schematic block diagram of yet another alternative embodiment of the vehicle-mounted ECU system of the present invention.
Detailed Description
The present application will now be described in further detail with reference to the accompanying drawings and specific examples. It is to be understood that the following illustrative embodiments and description are only intended to illustrate the present invention, and are not intended to limit the present invention, and features in the embodiments and examples may be combined with each other in the present application without conflict.
As shown in fig. 1, an alternative embodiment of the present invention provides an on-vehicle ECU power supply circuit 10, including:
the first voltage reduction module 101 is connected with the external power supply 3 and used for converting the voltage output by the external power supply 3 into a first preset voltage and then outputting the first preset voltage;
the second voltage reduction module 103 is respectively connected with the external power supply 3 and the first control module 12 of the vehicle-mounted ECU1, and is used for converting the voltage output by the external power supply 3 into a second predetermined voltage under the control of the first control module 12 and outputting the second predetermined voltage;
the output end of the second voltage-reducing module 101 is divided into a first branch 104 and a second branch 105, the output ends of the first branch 104 and the first voltage-reducing module 101 are connected through a switch circuit module 106 to form a first power supply port 107 for supplying power to the first control module 12, the second branch 105 is separately formed as a second power supply port 108 for supplying power to a power utilization module 14 in the vehicle-mounted ECU, which is not the first control module 12, the switch circuit module 106 includes a first MOS transistor Q1, a second MOS transistor Q2 and a triode Q3, wherein:
the input end of the first MOS transistor Q1 is connected to the output end of the first voltage-reducing module 101, the output end of the first MOS transistor Q1 is connected to the first power supply port 107, and the control end of the first MOS transistor Q1 is connected to the first branch 104 and grounded through the first resistor R1;
the input end of the second MOS transistor Q2 is connected to the first branch 104, and the output end of the second MOS transistor Q2 is connected to the first power supply port 107 and is respectively connected to the control end of the second MOS transistor Q2 and the input end of the triode Q3 through a second resistor R2;
the control terminal of the transistor Q3 is connected to the first branch 104, and the output terminal of the transistor Q3 is grounded.
The embodiment of the utility model provides an input through first MOS pipe Q1, output and control end correspond the output of connecting first step-down module 10110, first power supply port 107 and through first resistance R1 ground connection, and second MOS pipe Q2's input corresponds connects first branch 104 and the output links to each other with first power supply port 107 and is connected to second MOS pipe Q2's control end and triode Q3's input respectively through second resistance R2, triode Q3's control end links to each other with first branch 104 simultaneously, triode Q3's output ground connection, can effectual realization on-vehicle ECU system adopt the power supply demand of first step-down module 103 and first step-down module 101 respectively under normal operating mode and the low power consumption mode, and can effectively improve power supply efficiency higher, and can effectively stabilize the power supply for other power consumption modules 14.
In a specific embodiment of the present invention, the model of the first MOS transistor Q1 and the model of the second MOS transistor Q2 are LP3401LT1G, the model of the transistor Q3 is LMBT3904, and according to the above models of the MOS transistor and the triode, the first transistor Q1 and the second transistor Q2 are PMOS transistors, and the input end, the output end and the control end of the first transistor Q1 and the second transistor Q2 are respectively corresponding to a source electrode, a drain electrode and a gate electrode; the triode Q3 is an NPN type triode, and the input end, the output end and the control end of the triode Q3 are respectively a collector, an emitter and a base. It can be understood that, in practical applications, the respective input terminal, output terminal and control terminal can also be flexibly determined according to the type of the MOS transistor and the triode used.
The embodiment of the utility model provides a concrete theory of operation as follows: when the vehicle-mounted ECU1 normally works, the first control module 12 enters a normal working state from a low power consumption mode, the required current ratio is large, the first control module 12 outputs a control signal to control the second voltage reduction module 103 to start, at this time, the voltage input by the external power supply 3 enables the triode Q3 to be conducted, when the triode Q3 is conducted, the second MOS tube Q2 is further conducted, the second voltage reduction module 103 respectively supplies power to the first control module 12 and the power utilization module 14 through the first branch 104 and the second branch 105, on the other hand, the control end of the first MOS tube Q1 is connected with the first branch 104 to enable the first MOS tube Q1 to be cut off, the first control module 12 does not use the first voltage reduction module 101 to supply power, and the loss of the circuit is reduced; when the vehicle-mounted ECU1 is required to be out of operation and enter a standby mode or a low power consumption mode, the first control module 12 outputs a control signal again to control the second voltage reduction module 103 to be turned off, meanwhile, the triode Q3 is turned off, so that the second MOS transistor Q2 is turned off, the first control module 12 does not adopt the second voltage reduction module 103 to supply power, on the other hand, because the second MOS transistor Q2 is turned off, a voltage drop is formed on the first resistor R1, the second MOS transistor Q1 is turned on, the first control module 12 adopts the first voltage reduction module 101 to supply power, at this moment, due to the turn-off of the second MOS transistor Q2, mutual isolation between circuits is also realized.
In yet another alternative embodiment of the present invention, the control terminal of the transistor Q3 is connected to the first branch 104 through a third resistor R3. In this embodiment, by providing the third resistor R3, the third resistor R3 may function as a base resistor, and effectively protect the triode Q3.
In yet another alternative embodiment of the present invention, the first voltage reduction module 101 is a low dropout regulator. The first voltage reduction module 101 of this embodiment adopts a low dropout regulator, and can effectively convert the external voltage input by the external power supply 3 into a first predetermined voltage for output, and the types that can be selected for use are many, thereby improving compatibility.
In another optional embodiment of the present invention, the first voltage-reducing module 103 is a DC-DC voltage-reducing circuit. The first voltage reduction module 103 of the embodiment adopts a DC-DC voltage reduction circuit, so that the voltage conversion efficiency is high, and electric energy cannot be wasted.
On the other hand, as shown in fig. 1, the embodiment of the present invention provides an on-vehicle ECU system 1, including: a first control module 12 and a power supply circuit 10, wherein the power supply circuit 10 is the power supply circuit described in any one of the above embodiments, a power input terminal of the first control module 12 is connected to the first power supply port 107, a control signal output terminal of the first control module 12 is connected to a control terminal of the first voltage reduction module 103 to control on/off of the first voltage reduction module 103, and when the first voltage reduction module 103 is activated, the transistor Q3 and the second MOS transistor Q2 are enabled to be turned on and the first MOS transistor Q1 is disabled, and when the first voltage reduction module 103 is deactivated, the transistor Q3 and the second MOS transistor Q2 are disabled and the first MOS transistor Q1 is enabled.
In an optional embodiment of the present invention, as shown in fig. 2, the system further includes a second control module 16 and an audio/video module 18 correspondingly controlled by the second control module 66, and the second control module 16 and the audio/video module 18 are both connected to the second power supply port 108. The second control module 16 and the audio/video module 18 of the vehicle-mounted ECU system 1 of the present embodiment both use the second power supply port 108 connected to the first voltage-reducing module 103 to supply power, and do not use the first power supply port 107, thereby reducing the work of the first voltage-reducing module 101 and reducing the loss. In the embodiment shown in fig. 2, it is understood that, in the vehicle-mounted ECU1 mentioned in the above embodiment, the power utilization module 14 other than the first control module 12 may be the second control module 16 and the audio/video module 18, but is not limited thereto, and may also be a CAN transceiver module of the vehicle-mounted ECU system 1, and the details thereof are not described herein.
In yet another alternative embodiment of the present invention, the first control module 12 is an MCU chip, and the second control module 16 is a DSP chip. In the vehicle-mounted ECU system composed of the MCU chip and the DSP chip, the second power supply port 108 is adopted for power supply, so that the loss can be reduced, and the control requirement can be met.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and these forms are within the scope of the present invention.
Claims (7)
1. An in-vehicle ECU power supply circuit comprising:
the first voltage reduction module is connected with an external power supply and used for converting the voltage output by the external power supply into a first preset voltage and then outputting the first preset voltage;
the second voltage reduction module is respectively connected with the external power supply and the first control module of the vehicle-mounted ECU and is used for converting the voltage output by the external power supply into a second preset voltage under the control of the first control module and then outputting the second preset voltage;
the output end of the second voltage reduction module is divided into a first branch and a second branch, the output ends of the first branch and the first voltage reduction module are connected through a switch circuit module and then form a first power supply port for supplying power to the first control module, the second branch is separately formed into a second power supply port for supplying power to a power utilization module except the first control module in the vehicle-mounted ECU, and the switch circuit module is characterized by comprising a first MOS tube Q1, a second MOS tube Q2 and a triode Q3, wherein:
the input end of the first MOS tube Q1 is connected with the output end of the first voltage reduction module, the output end of the first MOS tube Q1 is connected with the first power supply port, and the control end of the first MOS tube Q1 is connected with the first branch circuit and is grounded through a first resistor R1;
the input end of the second MOS tube Q2 is connected with the first branch, the output end of the second MOS tube Q2 is connected with the first power supply port and is respectively connected to the control end of the second MOS tube Q2 and the input end of the triode Q3 through a second resistor R2;
the control end of the triode Q3 is connected with the first branch circuit, and the output end of the triode Q3 is grounded.
2. The on-board ECU power supply circuit of claim 1, wherein the control terminal of the transistor Q3 is connected to the first branch via a third resistor R3.
3. The vehicle ECU power supply circuit according to claim 1, wherein the first voltage reduction module is a low dropout linear regulator.
4. The on-board ECU power supply circuit of claim 1, wherein the second buck module is a DC-DC buck circuit.
5. An in-vehicle ECU system comprising: the power supply circuit as claimed in any one of claims 1 to 4, wherein the power input terminal of the first control module is connected to the first power supply port, a control signal output terminal of the first control module is connected to the control terminal of the second buck module to control on/off of the second buck module, and the transistor Q3 and the second MOS transistor Q2 are enabled to be turned on and the first MOS transistor Q1 is disabled when the second buck module is enabled, and the transistor Q3 and the second MOS transistor Q2 are disabled and the first MOS transistor Q1 is enabled when the second buck module is disabled.
6. The vehicle-mounted ECU system of claim 5, further comprising a second control module and an audio/video module correspondingly controlled by the second control module, wherein the second control module and the audio/video module are both connected to the second power supply port.
7. The vehicle-mounted ECU system of claim 6, wherein the first control module is an MCU chip and the second control module is a DSP chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022717460.XU CN214057436U (en) | 2020-11-20 | 2020-11-20 | Vehicle-mounted ECU system and power supply circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022717460.XU CN214057436U (en) | 2020-11-20 | 2020-11-20 | Vehicle-mounted ECU system and power supply circuit thereof |
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| CN214057436U true CN214057436U (en) | 2021-08-27 |
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| CN202022717460.XU Active CN214057436U (en) | 2020-11-20 | 2020-11-20 | Vehicle-mounted ECU system and power supply circuit thereof |
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