CN211089223U - Vehicle navigation MCU power supply circuit capable of improving power-on stability - Google Patents
Vehicle navigation MCU power supply circuit capable of improving power-on stability Download PDFInfo
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- CN211089223U CN211089223U CN201922377304.0U CN201922377304U CN211089223U CN 211089223 U CN211089223 U CN 211089223U CN 201922377304 U CN201922377304 U CN 201922377304U CN 211089223 U CN211089223 U CN 211089223U
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Abstract
The utility model discloses a vehicle-mounted navigation MCU power supply circuit for improving power-on stability, which relates to the technical field of vehicle-mounted circuits and aims to solve the problem that the MCU power supply of the existing vehicle-mounted navigation is directly realized by a voltage conversion IC from 12V to 3.3V; the MCU power supply device has the advantages that the MCU cannot be kept always powered on, the power supply time sequence can be caused to be in a problem when the MCU is powered on through a quick switch after power failure, and the MCU is caused to be in a fault and cannot be started. The effect that the MCU can be continuously supplied with power and cannot be started due to time sequence abnormity caused by the electrification of the quick switch is achieved.
Description
Technical Field
The utility model relates to a vehicle mounted circuit technical field, more specifically say, it relates to a vehicle navigation's MCU supply circuit on improvement electric stability.
Background
In the vehicle-mounted system, a communication device and a Micro Control Unit (MCU) adopt a dc power supply to supply power, and the MCU is a Control core of the entire vehicle-mounted system.
the prior Chinese patent with the publication number of CN102082503A discloses a power supply device for vehicle-mounted communication equipment and an MCU (micro control unit), which comprises a communication equipment power supply module and an MCU power supply module, wherein the communication equipment power supply module is used for converting the voltage of an external direct current power supply and supplying power to the vehicle-mounted communication equipment and the MCU power supply module, and the MCU power supply module is used for converting the direct current voltage output by the communication equipment power supply module and supplying power to the vehicle-mounted MCU.
The MCU power supply of the existing vehicle navigation is directly realized by a voltage conversion IC converting 12V to 3.3V; however, this design cannot keep the MCU powered on all the time, and the MCU will cause a problem in power supply timing sequence after power off when powered on by the fast switch, which causes the MCU to fail to start up, and thus needs to be improved.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide an improve on-vehicle navigation's of electric stability MCU supply circuit, it has can last the power supply for MCU, MCU can not lead to the advantage that the chronogenesis is unusual and can't start because of quick switch is last.
In order to achieve the above purpose, the utility model provides a following technical scheme:
The utility model provides an improve on-vehicle navigation's of electrical stability MCU supply circuit, includes the power module who supplies power for MCU, be provided with the electric power storage module who supplies power for MCU between power module and the MCU, the electric power storage module is connected with the module of charging who charges for the electric power storage module, the electric power storage module is connected with and is used for detecting the electric quantity of electric power storage module and sends control signal for the detection module of the module of charging.
By adopting the technical scheme, the electric energy stored in the electric storage module can always maintain the MCU in a continuous power supply state, so that the time sequence in the MCU is ensured to be in a continuous working state, the MCU cannot be disconnected due to power failure of the power supply module, the probability of time sequence problems caused by power failure is reduced, the probability of abnormal startup of the MCU due to the time sequence problems is reduced, and the stability of the MCU in working is ensured.
Furthermore, the electric power storage module comprises a rechargeable battery, the anode of the rechargeable battery is connected to an MCU power supply end for supplying power to the MCU, and the cathode of the rechargeable battery is grounded.
By adopting the technical scheme, the rechargeable battery can be charged by the arrangement of the rechargeable battery, so that the power storage module does not need to be replaced frequently, and the maintenance frequency of the power storage module is reduced.
Furthermore, the power storage module also comprises a current limiting diode, wherein the anode of the current limiting diode is connected with the anode of the rechargeable battery, and the cathode of the current limiting diode is connected with the power supply end of the MCU.
By adopting the technical scheme, the current limiting diode is convenient to add a current blocking unit on the power storage module and the power supply module, so that the power storage module is prevented from being damaged due to backward flowing of current caused by overlarge voltage of the power supply module; when the rechargeable battery and the power supply module simultaneously supply power for the MCU, the current limiting diode is not conducted because the voltage difference between two ends of the current limiting diode is zero, and the rechargeable battery is disconnected to supply power for the MCU and is converted into the power supply module to independently supply power for the MCU.
further, the charging module is an L DO voltage stabilization IC, an output end of the charging module is connected to the power storage module, and an input end of the charging module is connected to the power supply voltage.
by adopting the technical scheme, the L DO voltage stabilization IC stabilizes the power supply voltage and outputs the power supply voltage to the electric storage module so as to charge the electric storage module, so that the voltage of the electric storage module is maintained to be enough to supply power for the MCU.
further, the L DO regulator IC further includes an enable terminal, and the enable terminal is connected to the detection module.
by adopting the technical scheme, the setting of the enabling end enables the working state of the L DO voltage stabilizing IC to be convenient for control, so that the L DO voltage stabilizing IC can be closed when the L DO voltage stabilizing IC needs to be closed.
Further, the detection module is a micro control chip, the micro control chip includes an ADC port and a Vcontro port, the ADC port is connected to the power storage module, and the Vcontro port is connected to the enable terminal of the charging module.
by adopting the technical scheme, the ADC port can check the voltage of the electric storage module and transmit a signal to the micro control chip, the micro control chip outputs a high level to the enabling end through the Vcontro pin when the voltage of the electric storage module is lower than a preset value, the enabling end works when the high level is input so as to start the L DO voltage stabilizing IC to charge the electric storage module, and therefore the voltage of the electric storage module is ensured, and on the other hand, the enabling end can be closed when the electric storage module reaches 3.3V, so that the electric storage module is prevented from being in a charging state all the time and the service life of the rechargeable battery is prevented from being influenced.
Further, the detection module further comprises a current limiting resistor connected between the charging module and the power storage module in series and a protection resistor connected between the power storage module and the ADC port in series.
By adopting the technical scheme, because the rated input current of the electric power storage module is small, the current output by the charging module is convenient to limit due to the arrangement of the current-limiting resistor, so that the current input into the electric power storage module is small, and the electric power storage module is prevented from being burnt out due to overlarge current. The protection resistor is also arranged to limit the current and then input the current to the ADC port, so that the micro-control chip is protected.
further, filter capacitors are respectively connected in series between the input end and the output end of the L DO voltage regulator IC and the ground end.
by adopting the technical scheme, the arrangement of the filter capacitor is convenient for filtering the voltage output by the input L DO voltage-stabilizing IC and the L DO voltage-stabilizing IC, so that the voltage ripple is filtered out, and the stability of the input voltage and the output voltage is ensured.
To sum up, the utility model discloses following beneficial effect has:
1. The MCU is in a continuous power supply state by adopting a technology that a rechargeable battery continuously supplies power to the MCU and charges through a charging module, so that the effect of reducing the probability of incapability of starting up the MCU due to time sequence is achieved;
2. the technology that the L DO voltage-stabilizing IC is used as a charging module and is connected with an enabling end through a Vcontro port on a micro control chip for control is adopted, so that the effect of controlling the charging process through the micro control chip is achieved;
3. The technology that the ADC port on the micro-control chip is used for checking the voltage of the electric power storage module, limiting the current through the current limiting resistor and protecting the resistor is adopted, and therefore the effect that the charging module is started to charge when the voltage of the electric power storage module is lower than a preset value is achieved.
Drawings
Fig. 1 is a circuit diagram of an MCU power supply circuit for vehicle navigation, which improves power-on stability in an embodiment.
In the figure: 1. a power supply module; 2. an electric storage module; 3. a charging module; 4. and a detection module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b):
the utility model provides an improve on vehicle navigation's of electrical stability MCU supply circuit, refers to fig. 1, and it includes the power module 1 that supplies power for MCU, and power module 1 is B L9153 type low dropout linear voltage stabilizing chip, and its output is connected in MCU power end MCU _ VCC, and its output voltage is 3.3V, and its input is connected in last electric switch SB.
And a power storage module 2 for supplying power to the MCU is connected at the connecting point between the power supply module 1 and the MCU, and the voltage output by the power storage module 2 is 3.3V. The power storage module 2 includes a rechargeable battery C6, and the rechargeable battery C6 is a button rechargeable lithium battery. The positive pole of the rechargeable battery C6 is connected with the MCU power supply end MCU _ VCC for supplying power to the MCU, the negative pole of the rechargeable battery C6 is grounded, and the rechargeable battery C6 supplies power to the MCU when the power supply module 1 is closed, so that the MCU is kept in a normal power supply state; when the upper switch SB is closed, the power supply module 1 continues to supply power to the MCU, so that the MCU cannot be started due to the MCU timing sequence problem.
The power storage module 2 further includes a current limiting diode D1, the anode of the current limiting diode D1 being connected to the anode of the rechargeable battery C6, and the cathode thereof being connected to the MCU power supply terminal MCU _ VCC, so that a current can flow from the rechargeable battery C6 to the MCU power supply terminal MCU _ VCC but cannot flow from the MCU power supply terminal MCU _ VCC to the rechargeable battery C6.
the electric storage module 2 is connected with a charging module 3 for charging the electric storage module 2, the charging module 3 is an L DO voltage-stabilizing IC with the model number of L P3992-33B5F, the output end of the charging module is connected with the connection point of the current-limiting diode D1 in the electric storage module 2 and the anode of the rechargeable battery C6, and the input end of the charging module is connected with the power supply voltage VCC, so that the rechargeable battery C6 is charged through the charging module 3, and the electric quantity of the rechargeable battery C6 is ensured to be sufficient.
the L DO voltage-stabilizing IC further comprises an enable terminal EN, the enable terminal EN is connected with a detection module 4 for detecting the electric quantity of the electric storage module 2 and sending a control signal to the charging module 3, the detection module 4 detects the voltage of the rechargeable battery C6 and outputs a high level to the enable terminal EN when charging is needed, so that the charging module 3 works to charge the rechargeable battery C6.
Filter capacitors are respectively connected in series between the input end and the output end of the L DO voltage-stabilizing IC and the grounding end, the filter capacitor of the input end is C2, the filter capacitor of the output end is C5, and the filter capacitors can filter out noise waves of power input and power output.
The detection module 4 is a micro control chip, the micro control chip includes an ADC port and a Vcontro port, and the Vcontro port is a data output pin and outputs a high level or a low level. The micro control chip is a single chip with ADC port and Vcontro port, including but not limited to STM 32. In order to save materials, the micro control chip can directly select the MCU which is powered by the power supply circuit mentioned above. The ADC port is connected to the connection point of the anode of the current limiting diode D1 in the power storage module 2 and the anode of the rechargeable battery C6, so as to detect the output voltage of the battery and transmit a signal to the micro-control chip. The Vcontro port is connected to the enable terminal EN of the charging module 3, and the micro control chip outputs a high level at the Vcontro port when the voltage value detected at the ADC port is lower than a preset value, so that the charging module 3 starts to operate to charge the rechargeable battery C6 to ensure the internal voltage of the rechargeable battery C6 is full.
The detection module 4 further comprises a current limiting resistor R4 connected in series between the charging module 3 and the power storage module 2 and a protection resistor R5 connected in series between the power storage module 2 and the ADC port, the current limiting resistor R4 is 22 Ω, the resistance of the protection resistor R5 is 1K Ω, and when a voltage difference occurs between the voltage at the output terminal of the charging module 3 and the positive electrode of the rechargeable battery C6, the voltage is directly applied to both ends of the current limiting resistor R4, so that the magnitude of the charging current is limited by the current limiting resistor R4.
The working principle is as follows:
When the power supply module 1 is in a closed state, the rechargeable battery C6 continuously supplies power to the MCU, so that the MCU is in a normally open state, and the timing sequence inside the MCU keeps timing. When the power supply module 1 is suddenly started, the time sequence in the MCU cannot be disordered due to sudden power on, so that the probability that the MCU cannot be normally started due to disordered time sequence is reduced. When the power supply module 1 is started to supply power to the MCU, the voltage difference between the two ends of the current limiting diode D1 is zero, so that the current limiting diode D1 is not conducted, and at the moment, the rechargeable battery C6 is disconnected to supply power to the MCU, and the power supply module is converted to independently supply power to the MCU.
the ADC port of the micro-control chip converts the output voltage of the rechargeable battery C6 into the internal of the micro-control chip after ADC, when the voltage of the rechargeable battery C6 is lower than a preset value, the micro-control chip controls the Vcontro port to output a high level, and at the moment, the enable end EN of the L DO voltage stabilizing IC inputs a high level so as to start the L DO voltage stabilizing IC, at the moment, the output end of the L DO voltage stabilizing IC outputs 3.3V voltage to charge the rechargeable battery C6, at the moment, because the voltage difference exists between the two ends of the current limiting resistor R4, the current in the micro-control chip is the voltage difference between the two ends of the current limiting resistor R4 divided by the resistance value of the current limiting resistor, along with the increase of charging time, the voltage of the rechargeable battery C6 is gradually increased to 3.3V, at the moment, the ADC port of the micro-control chip detects that the voltage of the rechargeable battery C6 is 3.3V, the micro-control chip.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides an improve on-vehicle navigation's of electrical stability MCU supply circuit, includes power module (1) that supplies power for MCU, its characterized in that: the power storage module (2) that supplies power for MCU is connected to the junction between power module (1) and the MCU, power storage module (2) are connected with charge module (3) that charges for power storage module (2), power storage module (2) are connected with and are used for detecting power storage module (2) electric quantity and send control signal for detection module (4) of charging module (3).
2. The MCU power supply circuit for vehicle navigation for improving power-on stability of claim 1, wherein: the electric power storage module (2) comprises a rechargeable battery C6, the positive electrode of the rechargeable battery C6 is connected to an MCU power supply end MCU _ VCC for supplying power to the MCU, and the negative electrode of the rechargeable battery C6 is grounded.
3. The MCU power supply circuit for vehicle navigation for improving power-on stability of claim 2, wherein: the electric storage module (2) further comprises a current limiting diode D1, wherein the anode of the current limiting diode D1 is connected with the anode of the rechargeable battery C6, and the cathode of the current limiting diode D1 is connected with the MCU power supply end MCU _ VCC.
4. the MCU power supply circuit for vehicle navigation with improved power-on stability according to claim 1, wherein the charging module (3) is an L DO voltage stabilizing IC, the output end of the charging module is connected to the power storage module (2), and the input end of the charging module is connected to the power supply voltage VCC.
5. the MCU power supply circuit for vehicle navigation for improving power-on stability according to claim 4, wherein the L DO voltage regulator IC further comprises an enable terminal EN, and the enable terminal EN is connected to the detection module (4).
6. The MCU power supply circuit for vehicle navigation for improving power-on stability of claim 5, wherein: the detection module (4) is a micro control chip, the micro control chip comprises an ADC port and a Vcontro port, the ADC port is connected to the electric power storage module (2), and the Vcontro port is connected to an enable end EN of the charging module (3).
7. The MCU power supply circuit for vehicle navigation for improving power-on stability of claim 6, wherein: the detection module (4) further comprises a current limiting resistor R4 connected in series between the charging module (3) and the power storage module (2) and a protection resistor R5 connected in series between the power storage module (2) and the ADC port.
8. the MCU power supply circuit for vehicle navigation for improving power-on stability according to claim 4, wherein filter capacitors are respectively connected in series between the input end and the ground end of the L DO voltage stabilizing IC and between the output end and the ground end of the L DO voltage stabilizing IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922377304.0U CN211089223U (en) | 2019-12-25 | 2019-12-25 | Vehicle navigation MCU power supply circuit capable of improving power-on stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922377304.0U CN211089223U (en) | 2019-12-25 | 2019-12-25 | Vehicle navigation MCU power supply circuit capable of improving power-on stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211089223U true CN211089223U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922377304.0U Active CN211089223U (en) | 2019-12-25 | 2019-12-25 | Vehicle navigation MCU power supply circuit capable of improving power-on stability |
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| Country | Link |
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| CN (1) | CN211089223U (en) |
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