CN217087789U - MCU power supply circuit of vehicle navigation with low-power consumption - Google Patents
MCU power supply circuit of vehicle navigation with low-power consumption Download PDFInfo
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Abstract
The application relates to an MCU power supply circuit with low power consumption for vehicle navigation, which comprises a power supply unit, a detection unit and an adjusting unit. The input end of the power supply unit is connected with an alternating current power supply, the output end of the power supply unit is connected with the MCU system, and the power supply unit is used for converting alternating current voltage into direct current voltage and providing constant current direct current voltage for the MCU system of vehicle navigation. The detection unit is used for detecting the working temperature condition of the MCU power supply circuit and forming a temperature detection signal, the output end of the detection unit is coupled to the input end of the adjusting unit, the output end of the adjusting unit is coupled to the power supply unit, and when the adjusting unit receives the temperature detection signal, the adjusting unit starts to adjust the voltage power condition output by the power supply unit. The MCU power supply circuit has the effects of low-power-consumption power supply and overheating protection.
Description
Technical Field
The application relates to the technical field of vehicle navigation power supply, in particular to an MCU power supply circuit with low power consumption for vehicle navigation.
Background
With the technical development of the navigator, more and more vehicles are provided with vehicle-mounted navigators, the vehicle-mounted navigators comprise MCU control systems, and the MCU control systems are used for controlling the navigation system functions of the navigators, so that it is very important to provide a stable power supply circuit for the vehicle-mounted MCU.
The MCU power supply circuit of the existing vehicle navigation generally realizes the power supply for the MCU of the vehicle navigation through a conversion voltage device, but the existing power supply circuit can not realize the adjustment of the power supply power of the MCU, when the vehicle runs in the sunny weather, the vehicle navigation is increased along with the sunshine irradiation and the time of the vehicle navigator, the MCU control system of the vehicle navigation is easy to cause higher and higher working temperature, meanwhile, the MCU power supply circuit supplies power for the MCU control system continuously with high power voltage, the MCU control system of the vehicle navigation is easy to cause overheating and insensitive to use, the MCU control system of the vehicle navigation can be damaged seriously, therefore, a certain improvement space exists.
SUMMERY OF THE UTILITY MODEL
In order to enable the MCU power supply circuit to have low-power-consumption power supply and overheat protection functions, the application provides the MCU power supply circuit with low-power-consumption vehicle navigation.
The application provides a MCU supply circuit with vehicle navigation of low-power consumption adopts following technical scheme:
the utility model provides a MCU power supply circuit of on-vehicle navigation with low-power consumption, includes the power supply unit, detecting element and the regulating unit that supply power for the MCU system, the power supply unit is used for providing stable constant current direct current voltage for the MCU system, detecting element's output coupling is in the regulating unit, detecting element is used for detecting MCU power supply circuit's temperature and forms temperature detection signal transmission to the regulating unit, the output of regulating unit is connected in the power supply unit, the regulating unit is used for exporting the power of regulating signal to the power supply unit in order to adjust the power that changes power supply unit output voltage.
By adopting the technical scheme, the stable constant current direct current voltage is continuously provided for the MCU system through the power supply unit, the internal part of the MCU system is ensured to be in a continuous working state, the temperature condition of the work of the power supply circuit of the MCU system is detected in real time through the detection unit, the temperature detection signal is output to the adjusting unit in real time, the adjusting unit outputs an adjusting signal to the power supply unit according to the temperature detection signal, the power for changing the output voltage of the power supply unit is adjusted, the use effect of the vehicle navigation MCU control system is prevented from being influenced due to overhigh temperature of the power supply circuit of the MCU system, the input voltage power of the MCU system is adjusted by the adjusting unit, the power consumption of the MCU system is reduced, the power supply circuit of the MCU system has low-power-consumption power supply and overheating protection functions, and the practicability of the vehicle navigation MCU system is improved.
Optionally, the power supply unit includes a transformer, a rectifier subunit, a filter subunit, and a voltage converter subunit, wherein a primary side of the transformer is connected to the ac power supply, an input end of the rectifier subunit is coupled to a secondary side of the transformer, the filter subunit is coupled to an output end of the rectifier subunit, an input end of the voltage converter subunit is coupled to the filter subunit, and an output end of the voltage converter subunit is coupled to the MCU system.
By adopting the technical scheme, alternating current voltage is input to the primary side of the transformer, the alternating current voltage forms low alternating current voltage through the transformer and is output to the rectifier subunit through the secondary side, the rectifier subunit converts the alternating current voltage into direct current voltage, the filter subunit performs filtering processing on the direct current voltage and outputs stable direct current voltage to the voltage conversion subunit, the voltage conversion subunit performs voltage reduction processing on the direct current voltage to form stable constant current direct current voltage suitable for the MCU system to work and outputs the stable constant current direct current voltage to the MUC system, and the function of providing stable constant current direct current voltage for the MCU of vehicle navigation is achieved.
Optionally, the detecting element includes temperature detect module, comparison subassembly and switch module, temperature detect module is used for detecting MCU supply circuit's circuit temperature condition and output temperature detected signal, comparison subassembly is provided with the temperature signal threshold value, comparison subassembly's input is coupled in temperature detect module, when the temperature detected signal is greater than the temperature signal threshold value, comparison subassembly output temperature comparison signal, switch module's input is coupled in comparison subassembly, switch module's output is coupled in order to output to start trigger signal to the regulating element in the regulating element.
Through adopting above-mentioned technical scheme, can real-time detection MCU power supply circuit temperature condition and generate the temperature detection signal output to the comparison subassembly through the temperature detection subassembly, the comparison subassembly is provided with the temperature signal threshold value, the comparison subassembly compares the temperature detection signal who receives with the temperature signal threshold value and output temperature comparison signal to the switch module, when the switch module received the temperature comparison signal, the switch module output starts trigger signal to the regulating unit, make regulating unit work adjustment power supply unit output low power voltage, make MCU power supply circuit have the temperature detection function.
Optionally, the adjusting unit includes a control subunit and a power adjusting component, an input end of the control subunit is coupled to the switch component, an output end of the control subunit is coupled to the power adjusting component, when the control subunit inputs the start trigger signal, the control subunit outputs the control signal to the power adjusting component, an output end of the power adjusting component is coupled to the power supply unit, and the power adjusting component is used for adjusting the power of the output voltage of the power supply unit.
By adopting the technical scheme, when the control subunit inputs the starting trigger signal, the control subunit outputs the control signal to the power regulating assembly to control the power regulating assembly to start, and the power condition of the voltage output by the power supply unit is adjusted by the power regulating assembly, so that the MCU power supply circuit outputs low-power voltage to the MCU system, and the MCU system is started with low power consumption.
Optionally, the power adjustment component includes a MOS transistor Q, a first resistor R1, a second resistor R2, a third resistor R3, and a diode D1, a G pole of the MOS transistor Q is sequentially connected in series with the second resistor R2 and the third resistor R3, the other end of the third resistor R3 is coupled to the output end of the control subunit, a G pole of the MOS transistor Q is further coupled to the diode D1, the other end of the diode D1 is coupled to a connection node between the second resistor R2 and the third resistor R3, an S pole of the MOS transistor Q is coupled to the first resistor R1, the other end of the first resistor R1 is coupled to a connection node between the second resistor R2 and the third resistor R3, a connection node between the S pole of the MOS transistor Q and the first resistor R1 is grounded, and a D pole of the MOS transistor Q is coupled to the power supply unit.
By adopting the technical scheme, when the power regulating component receives the control signal output by the control subunit, the control signal is input to the G pole of the MOS tube Q, the voltage condition output by the D pole of the MOS tube Q is controlled and regulated, and then the direct-current voltage power output by the power supply unit is regulated, so that the MCU power supply circuit is regulated to output low-power voltage, and the low-power supply is output to supply power for the MCU of the vehicle-mounted navigation.
Optionally, the temperature detecting assembly includes a thermistor PTC and a fourth resistor R4, the thermistor PTC is connected in series with the fourth resistor R4, the other end of the thermistor PTC is coupled to a dc voltage, the other end of the fourth resistor R4 is grounded, and a connection node between the thermistor PTC and the fourth resistor R4 is coupled to the comparing assembly.
Through adopting above-mentioned technical scheme, thermistor PTC changes along with MCU power supply circuit's temperature situation, and its resistance also changes, and when MCU power supply circuit's circuit temperature rose, thermistor PTC's resistance increased, made the voltage at fourth resistance R4 both ends reduce, made the connected node output low level of fourth resistance R4 and thermistor PTC to the comparison subassembly, made temperature detection subassembly output temperature detection signal to the comparison subassembly.
Optionally, the comparing component includes a comparator N1, a first input terminal of the comparator N1 is coupled to a connection node between the thermistor PTC and the fourth resistor R4, a second input terminal of the comparator N1 is coupled to a dc voltage for inputting the temperature threshold signal, and an output terminal of the comparator N1 is coupled to the switching component.
By adopting the technical scheme, when the comparison component receives the temperature detection signal, the first input end of the comparator N1 inputs a low level, the voltage input by the first input end of the comparator N1 is smaller than the voltage input by the second input end of the comparator N1, the input end of the comparator N1 outputs a low level, and the comparison component outputs the temperature comparison signal to the switch component, so that the temperature comparison function is realized.
Optionally, the switch component includes a transistor Q1, a light emitting diode D, and a photoelectric switch Q2, a base of the transistor Q1 is coupled to the output end of the comparator N1, an emitter of the transistor Q1 is coupled to the power supply after being connected in series with the light emitting diode D, a collector of the transistor Q1 is grounded, the photoelectric switch Q2 is coupled to the light emitting diode D, a collector of the photoelectric switch Q2 is coupled to the control subunit, and an emitter of the photoelectric switch Q2 is grounded.
By adopting the technical scheme, when the switch component receives the temperature comparison signal, the base of the triode Q1 inputs a low level, the triode Q1 is in a conducting state, the light emitting diode D is electrified to output an infrared light signal, after the photoelectric switch tube Q2 receives the infrared light signal, the photoelectric switch tube Q2 is in a conducting state, and the collector of the photoelectric switch tube Q2 outputs a starting trigger signal to the control subunit.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the power supply unit is used for continuously providing stable constant-current direct-current voltage for the MCU system, the interior of the MCU system is ensured to be in a continuous working state, the detection unit is used for detecting the working temperature condition of a power supply circuit of the MCU system in real time and outputting a temperature detection signal to the adjusting unit in real time, the adjusting unit is used for outputting an adjusting signal to the power supply unit according to the temperature detection signal, the power of the output voltage of the power supply unit is adjusted and changed, and the power supply circuit of the MCU system has the functions of low-power-consumption power supply and overheating protection;
2. when the power adjusting component receives a control signal output by the control subunit, a control signal is input through the G pole of the MOS tube Q, the voltage condition output by the D pole of the MOS tube Q is controlled and adjusted, and further the duty ratio of the output direct-current voltage power of the primary side of the transformer of the power supply unit is adjusted, so that the MCU power supply circuit is adjusted to output low-power voltage, and the low-power supply is output to supply power to the MCU of the vehicle navigation system;
3. the detection unit is arranged through the MCU power supply circuit, so that the MCU power supply circuit can detect the temperature condition of the circuit in real time, and the use effect of the vehicle navigation MCU control system is prevented from being influenced by overhigh temperature of the MCU power supply circuit.
Drawings
Fig. 1 is a block diagram of an MCU power supply circuit of a vehicle navigation system with low power consumption according to an embodiment of the present application.
FIG. 2 is a circuit diagram of an MCU power supply circuit of vehicle navigation with low power consumption according to an embodiment of the present application.
Description of reference numerals: 1. a power supply unit; 11. a transformer; 12. a rectifier sub-unit; 13. a filtering subunit; 14. a voltage conversion subunit; 2. a detection unit; 21. a temperature detection assembly; 22. a comparison component; 23. a switch assembly; 3. an adjustment unit; 31. a control subunit; 32. a power conditioning assembly.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses an MCU power supply circuit with low power consumption for vehicle navigation.
Referring to fig. 1 and 2, an MCU power supply circuit for vehicle navigation with low power consumption includes a power supply unit 1, a detection unit 2, and an adjustment unit 3. The input end of the power supply unit 1 is connected with an alternating current power supply, the output end of the power supply unit 1 is connected with the MCU system, and the power supply unit 1 is used for converting alternating current voltage into direct current voltage and providing constant current direct current voltage for the MCU system of vehicle navigation. The detection unit 2 is used for detecting the working temperature condition of the MCU power supply circuit and forming a temperature detection signal, the output end of the detection unit 2 is coupled to the input end of the adjustment unit 3, the output end of the adjustment unit 3 is coupled to the power supply unit 1, and when the adjustment unit 3 receives the temperature detection signal, the adjustment unit 3 starts to adjust the voltage power condition output by the power supply unit 1.
The power supply unit 1 includes a transformer 11, a rectifying sub-unit 12, a filtering sub-unit 13, and a voltage converting sub-unit 14. The primary side of the transformer 11 is connected to an ac power supply, and the secondary side of the transformer 11 is connected to the rectifier unit 12.
The rectifying subunit 12 includes a diode D2, a diode D3, a diode D4, and a diode D5, wherein a cathode of the diode D2 is coupled to an anode of the diode D3, a cathode of the diode D3 is coupled to a cathode of the diode D4, an anode of the diode D4 is coupled to a cathode of the diode D5, an anode of the diode D5 is coupled to an anode of the diode D2, and a connection node between the diode D2 and the diode D3 and a connection node between the diode D4 and the diode D5 are coupled to the secondary side of the transformer 11; the connection node between the diode D3 and the diode D4 is a positive output terminal for providing a dc voltage, and the connection node between the diode D2 and the diode D5 is a negative output terminal for providing a ground terminal.
The input terminal of the filtering subunit 13 is coupled to the rectifying subunit 12, and the output terminal of the filtering subunit 13 is coupled to the voltage converting subunit 14. The filtering subunit 13 includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, wherein one end of the first capacitor C1 is coupled to a connection node between the diode D3 and the diode D4, the other end of the first capacitor C1 is coupled to a connection node between the diode D2 and the diode D5, the second capacitor C2 is connected in parallel to two ends of the first capacitor C1, the third capacitor C3 is connected in parallel to two ends of the second capacitor C2, and a connection node between the second capacitor C2 and the third capacitor C3 is coupled to the voltage converting subunit 14.
The input end of the voltage converting subunit 14 is coupled to the filtering subunit 13, and the output end of the voltage converting subunit 14 is connected to the MCU system. The voltage converting subunit 14 includes a converting chip U1, the converting chip U1 includes three pins, a first pin of the converting chip U1 is coupled to a connection node between the second capacitor C2 and the third capacitor C3, a second pin of the converting chip U1 is coupled to a connection node between the diode D2 and the diode D5, a third pin of the converting chip U1 is coupled to the MCU system, and the other end of the MCU system is grounded.
The detection unit 2 includes a temperature detection member 21, a comparison member 22, and a switch member 23. The temperature detection assembly 21 is used for detecting the circuit temperature condition of the MCU power supply circuit and outputting a temperature detection signal, the temperature detection assembly 21 comprises a thermistor PTC and a fourth resistor R4, the thermistor PTC is connected with the fourth resistor R4 in series, the other end of the thermistor PTC is coupled to direct-current voltage, the other end of the fourth resistor R4 is grounded, and the connection node of the thermistor PTC and the fourth resistor R4 is coupled to the comparison assembly 22.
The comparison component 22 is coupled to the temperature detection component 21 for outputting a temperature comparison signal when the temperature detection signal is inputted. The comparison component 22 includes a comparator N1, a first input terminal of the comparator N1 is an inverting input terminal, a second input terminal of the comparator N1 is a non-inverting input terminal, an inverting input terminal of the comparator N1 is coupled to a connection node between the thermistor PTC and the fourth resistor R4, a non-inverting input terminal of the comparator N1 is coupled to the dc voltage, and an output terminal of the comparator N1 is coupled to the switch component 23.
The switch element 23 is coupled to the comparison element 22 for outputting a start trigger signal when the temperature comparison signal is inputted. The switch component 23 includes a PNP transistor Q1, a light emitting diode D, and a photo switch Q2, wherein a base of the transistor Q1 is coupled to an output terminal of the comparator N1, an emitter of the transistor Q1 is coupled to a dc voltage after being connected in series with the light emitting diode D, a collector of the transistor Q1 is grounded, the photo switch Q2 is coupled to the light emitting diode D, a collector of the photo switch Q2 is coupled to the control subunit 31, and an emitter of the photo switch Q2 is grounded.
The regulating unit 3 comprises a control subunit 31 and a power regulating assembly 32. An input terminal of the control subunit 31 is coupled to the switch element 23 for receiving the start trigger signal. The control subunit 31 includes a control chip U2, the control chip U2 includes eight pins, a second pin of the chip U2 is a signal input terminal, a fifth pin of the chip U2 is an output terminal, a second pin of the chip U2 is coupled to a collector of the photoelectric switch Q2, a fourth pin of the chip U2 is grounded, a sixth pin of the chip U2 is coupled to a dc voltage, and a fifth pin of the chip U2 is coupled to the power conditioning component 32.
An input terminal of the power adjusting component 32 is coupled to the control subunit 31 for inputting the control signal, and an output terminal of the power adjusting component 32 is coupled to the power supply unit 1 for outputting the adjusting signal. The power adjusting component 32 includes a MOS transistor Q, a first resistor R1, a second resistor R2, a third resistor R3, and a diode D1, a G pole of the MOS transistor Q is sequentially connected in series with the second resistor R2 and the third resistor R3, the other end of the third resistor R3 is coupled to the fifth pin of the control chip U2, the G pole of the MOS transistor Q is further coupled to the diode D1, the other end of the diode D1 is coupled to a connection node between the second resistor R2 and the third resistor R3, an S pole of the MOS transistor Q is coupled to the first resistor R1, the other end of the first resistor R1 is coupled to a connection node between the second resistor R2 and the third resistor R3, the S pole of the MOS transistor Q is grounded to the connection node between the first resistor R1, and the D pole of the MOS transistor Q is coupled to the primary side of the transformer 11.
The implementation principle of the MCU power supply circuit with low power consumption for vehicle navigation in the embodiment of the application is as follows:
the alternating current power supply outputs alternating current voltage to the primary side of the transformer 11, the transformer 11 forms low alternating current voltage, the low alternating current voltage is output to the rectifier subunit 12 through the secondary side of the transformer 11, the rectifier subunit 12 performs rectification and quasi-conversion processing on the low alternating current voltage to form direct current voltage, the direct current voltage is output to the MCU power supply circuit through a connection node of the diode D3 and the diode D4, the direct current voltage is subjected to filtering processing through the first capacitor C1, the second capacitor C2 and the third capacitor C3 of the filtering wave subunit 13 and then input to the voltage conversion subunit 14, the conversion chip U1 of the voltage conversion subunit 14 performs voltage reduction processing on the direct current voltage again to form stable constant current direct current voltage suitable for the work of the MCU system and outputs the stable constant current direct current voltage to the MCU system to supply power for vehicle navigation.
When the working temperature of the circuit in the MCU power supply circuit increases with the increase of the working time, the resistance of the thermistor PTC in the temperature detection assembly 21 changes, the resistance of the thermistor PTC increases, the voltage at the two ends of the fourth resistor R4 decreases, the connection node between the fourth resistor R4 and the thermistor PTC outputs a low level to the comparison assembly 22, and the temperature detection assembly 21 outputs a temperature detection signal to the comparison assembly 22;
the inverting input terminal of the comparator N1 of the comparison component 22 inputs a low level, the voltage input by the inverting input terminal of the comparator N1 is less than the voltage input by the non-inverting input terminal of the comparator N1, the output terminal of the comparator N1 outputs a low level, and the comparison component 22 outputs a temperature comparison signal; the base of the PNP transistor Q1 of the switching element 23 inputs a low level, the transistor Q1 is turned on, the light emitting diode D outputs an infrared light signal, when the photoelectric switching tube Q2 receives the infrared light signal, the photoelectric switching tube Q2 is in a conducting state, and the collector of the photoelectric switching tube Q2 outputs a start trigger signal to the control subunit 31 of the adjusting element;
after the second pin of the control chip U2 of the control subunit 31 receives the start trigger signal, the fifth pin of the control chip U2 outputs a control signal to the power adjustment component 32, and the G pole of the MOS transistor Q of the power adjustment component 32 inputs a control signal to adjust and reduce the voltage output by the D pole of the MOS transistor Q, thereby adjusting the duty ratio of the primary side of the transformer 11 in the power supply unit 1, achieving the purpose of reducing and adjusting the voltage power output by the MCU power supply circuit, and realizing low power consumption to supply power to the MCU system of the vehicle navigation.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a MCU supply circuit of on-vehicle navigation with low-power consumption which characterized in that: including carrying out power supply unit (1), detecting element (2) and regulating unit (3) of supplying power for the MCU system, power supply unit (1) is used for providing stable constant current DC voltage for the MCU system, the output coupling of detecting element (2) is in regulating unit (3), detecting element (2) are used for detecting MCU power supply circuit's temperature and form temperature detection signal transmission to regulating unit (3), the output of regulating unit (3) is connected in power supply unit (1), regulating unit (3) are used for exporting the power that regulating signal changes power supply unit (1) output voltage to power supply unit (1) in order to adjust.
2. The MCU power supply circuit with low power consumption for vehicle navigation according to claim 1, characterized in that: the power supply unit (1) comprises a transformer (11), a rectifier subunit (12), a filter subunit (13) and a voltage conversion subunit (14), wherein a primary side of the transformer (11) is connected to an alternating current power supply, an input end of the rectifier subunit (12) is coupled to a secondary side of the transformer (11), the filter subunit (13) is coupled to an output end of the rectifier subunit (12), an input end of the voltage conversion subunit (14) is coupled to the filter subunit (13), and an output end of the voltage conversion subunit (14) is coupled to the MCU system.
3. The MCU power supply circuit with low power consumption for vehicle navigation according to claim 1, characterized in that: the detection unit (2) comprises a temperature detection assembly (21), a comparison assembly (22) and a switch assembly (23), wherein the temperature detection assembly (21) is used for detecting the circuit temperature condition of the MCU power supply circuit and outputting a temperature detection signal, the comparison assembly (22) is provided with a temperature signal threshold value, the input end of the comparison assembly (22) is coupled to the temperature detection assembly (21), when the temperature detection signal is larger than the temperature signal threshold value, the comparison assembly (22) outputs a temperature comparison signal, the input end of the switch assembly (23) is coupled to the comparison assembly (22), and the output end of the switch assembly (23) is coupled to the adjusting unit (3) so as to output a starting trigger signal to the adjusting unit (3).
4. An MCU power supply circuit with low power consumption for vehicle navigation according to claim 3, characterized in that: the adjusting unit (3) comprises a control subunit (31) and a power adjusting component (32), wherein the input end of the control subunit (31) is coupled to the switch component (23), the output end of the control subunit (31) is coupled to the power adjusting component (32), when the control subunit (31) inputs a starting trigger signal, the control subunit (31) outputs a control signal to the power adjusting component (32), the output end of the power adjusting component (32) is coupled to the power supply unit (1), and the power adjusting component (32) is used for adjusting the power of the output voltage of the power supply unit (1).
5. An MCU power supply circuit with low power consumption for vehicle navigation according to claim 4, characterized in that: the power regulation component (32) comprises a MOS transistor Q, a first resistor R1, a second resistor R2, a third resistor R3 and a diode D1, the G pole of the MOS transistor Q is sequentially connected with the second resistor R2 and the third resistor R3 in series, the other end of the third resistor R3 is coupled to the output end of the control subunit (31), the G pole of the MOS transistor Q is further coupled to the diode D1, the other end of the diode D1 is coupled to the connection node between the second resistor R2 and the third resistor R3, the S pole of the MOS transistor Q is coupled to the first resistor R1, the other end of the first resistor R1 is coupled to the connection node between the second resistor R2 and the third resistor R3, the S pole of the MOS transistor Q is grounded to the connection node between the first resistor R1, and the D pole of the MOS transistor Q is coupled to the power supply unit (1).
6. The MCU power supply circuit with low power consumption for vehicle navigation of claim 3, characterized in that: the temperature detection assembly (21) comprises a thermistor PTC and a fourth resistor R4, the thermistor PTC is connected with the fourth resistor R4 in series, the other end of the thermistor PTC is coupled with direct-current voltage, the other end of the fourth resistor R4 is grounded, and a connection node of the thermistor PTC and the fourth resistor R4 is coupled with the comparison assembly (22).
7. The MCU power supply circuit with low power consumption for vehicle navigation according to claim 6, characterized in that: the comparison component (22) comprises a comparator N1, a first input end of the comparator N1 is coupled to a connection node of the thermistor PTC and the fourth resistor R4, a second input end of the comparator N1 is coupled to a direct-current voltage to input a temperature threshold signal, and an output end of the comparator N1 is coupled to the switch component (23).
8. An MCU power supply circuit with low power consumption for vehicle navigation according to claim 7, characterized in that: the switch component (23) comprises a triode Q1, a light emitting diode D and a photoelectric switch tube Q2, wherein the base electrode of the triode Q1 is coupled to the output end of the comparator N1, the emitter electrode of the triode Q1 is coupled to the power supply after being connected in series with the light emitting diode D, the collector electrode of the triode Q1 is grounded, the photoelectric switch tube Q2 is coupled to the light emitting diode D, the collector electrode of the photoelectric switch tube Q2 is coupled to the control subunit (31), and the emitter electrode of the photoelectric switch tube Q2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220920451.7U CN217087789U (en) | 2022-04-18 | 2022-04-18 | MCU power supply circuit of vehicle navigation with low-power consumption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220920451.7U CN217087789U (en) | 2022-04-18 | 2022-04-18 | MCU power supply circuit of vehicle navigation with low-power consumption |
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| CN217087789U true CN217087789U (en) | 2022-07-29 |
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| CN202220920451.7U Active CN217087789U (en) | 2022-04-18 | 2022-04-18 | MCU power supply circuit of vehicle navigation with low-power consumption |
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