CN217135220U - Power supply circuit of navigation system - Google Patents
Power supply circuit of navigation system Download PDFInfo
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- CN217135220U CN217135220U CN202220844311.6U CN202220844311U CN217135220U CN 217135220 U CN217135220 U CN 217135220U CN 202220844311 U CN202220844311 U CN 202220844311U CN 217135220 U CN217135220 U CN 217135220U
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Abstract
The application discloses navigation's supply circuit includes: the output end of the direct current power supply module is electrically connected with the navigator module, and the direct current power supply module is used for converting alternating current electric energy into direct current electric energy and then transmitting the direct current electric energy to the navigator module for power supply; the output end of the USB power supply module is electrically connected with the navigator module, and the USB power supply module is used for supplying electric energy to the navigator module by accessing an external power supply when the direct current power supply module is disconnected from supplying power; the battery power supply module, battery power supply module and USB power supply module electric connection, battery power supply module are used for supplying power to the navigator module when direct current power supply module and USB power supply module disconnection power supply. The problem of the navigator stop work because external power supply or charger trouble disconnection power supply, inconvenient people's use in daily life has been solved in this application, has made things convenient for the use of navigator in people's daily life effectively.
Description
Technical Field
The application relates to the technical field of navigators, in particular to a power supply circuit of a navigation system.
Background
The main structure of the navigation system comprises a navigator, and the navigator is a driving auxiliary device for positioning, navigation and entertainment, and with the popularization of the navigator and the construction of roads, the economic exchange between cities is more frequent. The navigator integrating accurate positioning, navigation and entertainment functions can better meet the requirements of car owners, and also becomes basic equipment for daily travel and outdoor travel.
At present, the operation of the navigator is generally that an external power supply or a charger provides electric energy. The navigator is internally provided with a power supply circuit which is used for being connected with an external power supply or a charger, so that the navigator is electrified to work. However, when the external power supply or the charger is disconnected due to a fault to cause abnormal power failure of the navigator, the navigator stops working without power supply, which is inconvenient for people to use the navigator in daily life.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that the navigator in the related art stops working due to the fact that an external power supply or a charger is disconnected in fault and is inconvenient for people to use in daily life, the application provides a power supply circuit of a navigation system.
The power supply circuit of the navigation system adopts the following technical scheme:
a power supply circuit for a navigation system, comprising:
the output end of the direct current power supply module is electrically connected with the navigator module, and the direct current power supply module is used for converting alternating current electric energy into direct current electric energy and then transmitting the direct current electric energy to the navigator module for power supply;
the output end of the USB power supply module is electrically connected with the navigator module, and the USB power supply module is used for supplying electric energy to the navigator module by accessing an external power supply when the direct current power supply module is disconnected from supplying power;
the storage battery power supply module is electrically connected with the USB power supply module and used for supplying power to the navigator module when the direct current power supply module and the USB power supply module are disconnected from supplying power.
By adopting the technical scheme, when the navigator starts to work, the direct current power supply module can be accessed to direct current electric energy to directly supply power to the navigator module. When the direct current power supply module is disconnected for power supply, the USB power supply module can be connected into an external mobile power supply to directly supply power to the navigator module, and meanwhile, the USB power supply module provides electric energy to the storage battery power supply module, and the storage battery stores the electric energy. When the direct current power supply module and the USB power supply module are disconnected for power supply at the same time, the storage battery power supply module starts to work, the storage battery discharges, the storage battery provides electric energy for the navigator module to maintain the work of the navigator, and when the navigator stops working due to the fact that the external power supply or the charger breaks down to supply power, the navigator is powered by multiple power supply modules, so that people can use the navigator in daily life conveniently.
Preferably, the direct current power supply module includes a rectifying unit for converting the input alternating current into direct current and a first voltage regulating unit for regulating the voltage of the rectified electric energy, an output end of the rectifying unit is electrically connected to an input end of the first voltage regulating unit, and an output end of the first voltage regulating unit is electrically connected to an input end of the navigator module.
Through adopting above-mentioned technical scheme, when the direct current supply module began the circular telegram, export the alternating current for the direct current through the rectifier unit, carry to first voltage regulating unit, rethread first voltage regulating unit steps down the direct current to the constant voltage after stepping down is exported to the navigator module.
Preferably, the first voltage regulating unit includes a first voltage stabilizing chip IC1 and a first current spreading portion for spreading current of the output current of the first voltage stabilizing chip IC1, an input pin of the first voltage stabilizing chip IC1 is connected to the positive output end of the rectifying unit, an output pin of the first voltage stabilizing chip IC1 is electrically connected to the input end of the navigator module, and the first current spreading portion is electrically connected to the navigator module.
Through adopting above-mentioned technical scheme, when the direct current of rectifier unit output conveyed to first voltage regulating unit, the direct current is stepped down through first voltage stabilizing chip IC1 to the constant voltage after stepping down is exported to the navigator module. Meanwhile, the output current of the first voltage stabilizing chip IC1 is diffused through the first current diffusing part, so that a large current in a certain range is output to the navigator module, and the first voltage stabilizing chip IC1 is effectively prevented from being burnt out due to the fact that a large input current passes through the first voltage stabilizing chip IC 1.
Preferably, the rectifier unit includes the rectifier bridge, the input electric connection of rectifier bridge has the vary voltage module, the positive pole input of rectifier bridge, negative pole input respectively with the positive pole output of vary voltage module, negative pole output electric connection, the anodal output electric connection of rectifier bridge in the input of first voltage regulating unit, the negative pole output electric connection of rectifier bridge in the output of navigator module.
By adopting the technical scheme, the alternating current of the external power supply is transformed through the transformation module, and then rectified through the rectifier bridge to output the direct current to the first voltage regulating unit, so that the direct current with adaptive voltage is output to the navigator module.
Preferably, the USB power supply module includes a USB input interface for accessing an external power source and a second voltage regulating unit for regulating voltage of electric energy accessed by the USB input interface, and the second voltage regulating unit is electrically connected to the USB input interface.
By adopting the technical scheme, when the direct current power supply module is disconnected for power supply, the USB input interface is connected with direct current by being connected with an external power supply, and then the direct current is reduced by the second voltage regulating unit, so that direct current electric energy after voltage reduction is provided for the navigator module.
Preferably, the second voltage regulating unit includes a second voltage stabilizing chip IC2 and a second current expanding part for expanding current of the output current of the second voltage stabilizing chip IC2, an input pin of the second voltage stabilizing chip IC2 is electrically connected to the USB input interface, an output pin of the second voltage stabilizing chip IC2 is electrically connected to the input end of the navigator module, and the second current expanding part is electrically connected to the navigator module.
Through adopting above-mentioned technical scheme, when external power supply passed through the direct current of USB input interface input and carried to second voltage regulating unit, the direct current is stepped down through second voltage regulation chip IC2 to the constant voltage after stepping down is exported to the navigator module. Meanwhile, the output current of the second voltage stabilizing chip IC2 is expanded through the second current expansion part, so that a large current in a certain range is output to the navigator module, and the second voltage stabilizing chip IC2 is effectively prevented from being burnt out due to the fact that a large input current passes through the second voltage stabilizing chip IC 2.
Preferably, the battery power supply module includes a constant voltage chip IC3 and a battery, the power input pin of the constant voltage chip IC3 is electrically connected to the USB power supply module, the output pin of the constant voltage chip IC3 is electrically connected to the battery, and the positive electrode of the battery is electrically connected to the navigator module.
Through adopting above-mentioned technical scheme, when the USB power module supplied power to the navigator module, the USB power module charges the battery through constant voltage chip IC3 simultaneously. And when the direct current power supply module and the USB power supply module are disconnected for power supply, the storage battery power supply module is connected, and the storage battery provides electric energy for the navigator module, so that the storage battery power supply module provides electric energy for the navigator module.
Preferably, the output end of the storage battery power supply module is electrically connected with a switch part for controlling the power-on and power-off of the storage battery power supply module, and the output end of the switch part is electrically connected with the navigator module.
Through adopting above-mentioned technical scheme, when USB power supply module supplied power to the navigator module, USB power supply module charges the battery through constant voltage chip IC3, and switch portion control battery power supply module cuts off the power supply to the navigator module simultaneously. When the direct current power supply module and the USB power supply module are disconnected for power supply, the switch part controls the storage battery power supply module to be connected and provides electric energy for the navigator module, so that the storage battery power supply module provides electric energy for the navigator module.
Preferably, the switch portion includes relay KM electrically connected with the navigator module, normally closed contact switch KM-1 controlled by relay KM, and manual switch SW electrically connected with an output pin of constant voltage chip IC3, the positive pole of relay KM with the output end electrically connected with the constant voltage chip, the negative pole of relay KM is grounded, the output end electrically connected with the input end of normally closed contact switch KM-1 of manual switch SW, the output end electrically connected with the input end of navigator module of normally closed contact switch KM-1.
By adopting the technical scheme, when the USB power supply module supplies power, the relay KM is powered on, and the normally closed contact switch KM-1 of the relay KM is disconnected, so that the storage battery power supply module is disconnected from the navigator module, and the USB power supply module supplies power to the navigator module. When the direct current power supply module and the USB power supply module are both disconnected for power supply, the relay KM is powered off, so that the normally closed contact switch KM-1 of the relay KM is kept in a closed state, at the moment, a user presses the manual switch SW, and at the moment, the storage battery power supply module supplies power to the navigator module.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the navigator is abnormally powered off due to the fault of an external power supply or a charger, the storage battery discharges electricity to supply electricity to the navigator module, so that the navigator can normally operate, and the navigator is effectively and conveniently used in daily life of people;
2. the switch part is arranged between the storage battery power supply module and the navigator module, so that when the USB power supply module supplies power to the navigator module, the switch part controls the storage battery power supply module to be disconnected to supply power to the navigator module, and people can conveniently control the storage battery power supply module to supply power to the navigator module.
Drawings
Fig. 1 is a schematic diagram of the overall circuit structure of the present embodiment.
Fig. 2 is a schematic circuit diagram of the dc power supply module in this embodiment.
Fig. 3 is a schematic circuit diagram of the USB power supply module and the battery power supply module in this embodiment.
Description of reference numerals:
1. a DC power supply module; 11. a rectifying unit; 12. a first voltage regulating unit; 121. a first flow expansion section; 2. a USB power supply module; 21. a second voltage regulating unit; 211. a second flow expansion section; 3. a storage battery power supply module; 4. a voltage transformation module; 5. a switch section.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
Referring to fig. 1, a power supply circuit of a navigation system includes a voltage transformation module 4, a dc power supply module 1, and a navigator module. The transformation module 4 is connected with an external power supply and used for transforming the alternating current power of the external power supply and outputting the alternating current power to the direct current power supply module 1; the dc power supply module 1 is configured to convert ac power output by the transformer module 4 into dc power, and then transmit the dc power to the navigator module for power supply.
Specifically, the voltage transformation module 4 includes a transformer for transforming the voltage of the external power supply and outputting the transformed voltage to the dc power supply module 1, the transformer includes a primary coil and a secondary coil, the primary coil of the transformer is connected to the external power supply, and the secondary coil of the transformer is connected to the dc power supply module 1. After the voltage reduction by the transformer, the voltage of the external power supply is reduced to 12V and output to the dc power supply module 1.
Referring to fig. 1 and 2, the dc power supply module 1 includes a rectifying unit 11 and a first voltage regulating unit 12 electrically connected to the rectifying unit 11, wherein the rectifying unit 11 is configured to receive ac power transformed by a transformer and output dc power, and the first voltage regulating unit 12 is electrically connected to the rectifying unit 11 to output a constant voltage of 5V.
Specifically, the rectifier unit 11 includes a rectifier bridge, an anode input end and a cathode input end of the rectifier bridge are electrically connected to an anode output end and a cathode output end of the secondary coil of the transformer, respectively, an anode output end of the rectifier bridge is electrically connected to an input end of the first voltage regulating unit 12, and a cathode output end of the rectifier bridge is electrically connected to an output end of the navigator module.
In addition, the rectifying unit 11 further includes two filter capacitors connected in parallel, the two filter capacitors are respectively a first capacitor C1 and a second capacitor C2, the first capacitor is a low-frequency filter capacitor, the second capacitor is a high-frequency filter capacitor, and the positive electrode and the negative electrode of the first capacitor C1 are respectively and correspondingly electrically connected with the positive electrode output end and the negative electrode output end of the rectifying bridge; similarly, the positive and negative electrodes of the second capacitor C2 are electrically connected to the positive and negative output terminals of the rectifier bridge, respectively. The 12V ac power is rectified by the rectifier bridge to output about 10.8V dc power, and filtered by the parallel connection of the first capacitor C1 and the second capacitor C2 to output the filtered voltage to the first voltage regulating unit 12.
Referring to fig. 1 and 2, the first voltage regulating unit 12 mainly includes a first voltage regulation chip IC1 and a peripheral standard circuit of a first voltage regulation chip IC1, and the model of the first voltage regulation chip IC1 is an LM7805 chip. The LM7805 chip is used for reducing the direct current provided by the rectifier bridge to 5V so as to be convenient for adapting to the working voltage of the navigator module. The input pin of LM7805 chip is connected in the anodal output of rectifier bridge, and the output pin electric connection of LM7805 chip is in the input of navigator module.
The first voltage regulating unit 12 further includes a first current spreading part 121 electrically connected to the input end of the navigator module. The first current expanding portion 121 includes a resistor disposed between the LM7805 chip and the rectifying unit 11 and a first triode Q1 electrically connected to the LM7805 chip, the first triode Q1 is a PNP type triode, a base of the first triode Q1 is connected between the resistor R1 and the LM7805 chip, an emitter of the first triode Q1 is connected to a positive output end of the rectifying bridge, and a collector of the first triode Q1 is connected to an output pin of the LM7805 chip. When the second capacitor C2 is in a charging state, the potential voltage of the positive electrode of the second capacitor C2 rises, and is divided by the load resistor R1, so that the voltage of the emitter of the first triode Q1 is greater than the voltage of the base of the first triode Q1, and the voltage of the base of the first triode Q1 is greater than the voltage of the collector of the first triode Q1, so that the emitter of the first triode Q1 is positively biased, and the collector of the first triode Q1 is reversely biased, at this time, the first triode Q1 is in a current amplification state, which not only outputs a large current in a certain range to the navigator module, but also prevents a large input current from burning out the LM7805 chip through the LM7805 chip.
Referring to fig. 1 and 3, the power supply circuit further includes a USB power supply module 2, the USB power supply module 2 is electrically connected to the navigator module, and when the dc power supply module 1 is disconnected to supply power to the navigator module, the USB power supply module 2 can supply power to the navigator module through an external power supply.
Specifically, the USB power supply module 2 includes a USB input interface and a second voltage regulating unit 21 electrically connected to the USB input interface, and the USB input interface is used for connecting an external charger or a mobile power supply to the low voltage power supply, so as to provide electric energy for the navigator module. The second voltage regulating unit 21 is electrically connected to the USB input interface, so as to output a constant voltage of 5V to the navigator module.
Referring to fig. 1 and 3, the second voltage regulating unit 21 mainly includes a second voltage regulating chip IC2 and a peripheral standard circuit of a second voltage regulating chip IC2, and the model of the second voltage regulating chip IC2 is an LM7805 chip. The LM7805 chip is used for reducing the voltage provided by the USB input interface to 5V so as to be convenient for adapting to the working voltage of the navigator module. The input pin of the LM7805 chip is electrically connected to the USB input interface, and the output pin of the LM7805 chip is electrically connected to the input end of the navigator module.
The second voltage regulating unit 21 further includes a second current expanding portion 211 electrically connected to the input end of the navigator module. The second current expanding portion 211 comprises a resistor arranged between the LM7805 chip and the USB input interface and a second triode Q2 electrically connected to the LM7805 chip, the second triode Q2 is a PNP type triode, a base of the second triode Q2 is connected between the resistor R3 and the LM7805 chip, an emitter of the second triode Q2 is connected to the USB input interface, and a collector of the second triode Q2 is connected to an output pin of the LM7805 chip. When the USB input interface provides electric energy, the voltage is divided through the load resistor, so that the voltage of an emitting electrode of the second triode Q2 is greater than the voltage of a base electrode of the second triode Q2, the voltage of a base electrode of the second triode Q2 is greater than the voltage of a collecting electrode of the second triode Q2, the emitting junction of the second triode Q2 is forward biased, the collecting junction is reverse biased, and at the moment, the second triode Q2 is in a current amplification state, so that a large current in a certain range is output to the navigator module, and the LM7805 chip is prevented from being burnt out due to the fact that a large input current passes through the LM7805 chip.
Referring to fig. 1 and 3, the output end of the LM7805 chip is electrically connected to the battery power supply module 3 and the switch unit 5 for controlling the power on and off of the battery power supply module 3, and the output end of the battery power supply module 3 is electrically connected to the input end of the navigator module. When the direct current power supply module 1 and the USB power supply module 2 are disconnected for power supply, the switch part 5 controls the storage battery power supply module 3 to be connected and provides electric energy for the navigator module, so that the storage battery power supply module 3 provides electric energy for the navigator module, and when the USB power supply module 2 supplies power for the navigator module, the switch part 5 controls the storage battery power supply module 3 to be disconnected for supplying power for the navigator module.
Specifically, the secondary battery power supply module 3 includes a constant voltage chip IC3, a secondary battery, and a peripheral circuit of a constant voltage chip IC3, and the model of the constant voltage chip IC3 is a TP4057 chip. The power input pin (VCC pin) of TP4057 chip and the output electric connection of LM7805 chip, the output pin (BAT pin) of TP4057 chip and the anodal electric connection of battery, the negative pole ground connection of battery. Meanwhile, the anode of the storage battery is electrically connected to the input end of the navigator module. When the USB power supply module 2 supplies power to the navigator module, the USB power supply module 2 charges the storage battery through the TP4057 chip, and controls the storage battery power supply module 3 to be disconnected through the switch part 5 to supply power to the navigator module. When the direct current power supply module 1 and the USB power supply module 2 are disconnected for power supply, the switch part 5 controls the storage battery power supply module 3 to be connected, and at the moment, the storage battery provides electric energy for the navigator module, so that the storage battery power supply module 3 provides electric energy for the navigator module.
Referring to fig. 1 and 3, the switch unit 5 includes a relay KM electrically connected to the navigator module, and a normally closed contact switch KM-1 controlled by the relay KM. The positive pole of relay KM and the output end electric connection of LM7805 chip, the negative pole ground connection of relay KM. When the USB power supply module 2 starts to be powered on, the relay KM is powered on, the normally closed contact switch KM-1 of the relay KM is disconnected, so that the storage battery power supply module 3 is disconnected from the navigator module, and at the moment, the USB power supply module 2 supplies power to the navigator module. When the direct current power supply module 1 and the USB power supply module 2 are both disconnected for power supply, the relay KM is powered off, so that the normally closed contact switch KM-1 of the relay KM is kept in a closed state, and at the moment, the storage battery power supply module 3 supplies power to the navigator module.
The switch part 5 further comprises a manual switch SW electrically connected with an output pin of the TP4057 chip, and an output end of the manual switch SW is electrically connected with the navigator module. When the direct current power supply module 1 and the USB power supply module 2 are disconnected for power supply, a user presses the manual switch SW to enable the storage battery power supply module 3 to be connected, the storage battery provides electric energy for the navigator module at the moment, and therefore the storage battery power supply module 3 provides the electric energy for the navigator module.
In addition, the output pin of the storage battery power supply module 3 is also electrically connected with a voltage stabilizing diode D5, and the voltage stabilizing diode D5 is used for keeping the voltage output by the TP4057 chip stable. The input end of the voltage stabilizing diode D5 is electrically connected with the output end of the storage battery, and the output end of the voltage stabilizing diode D5 is electrically connected with the manual switch SW
The implementation principle of the embodiment of the application is as follows: when the navigator starts to work, the electric energy transformed by the transformation module 4 can be accessed through the direct current power supply module 1 to directly supply power to the navigator module. When the direct current power supply module 1 is disconnected for power supply, the external mobile power supply is connected to the USB power supply module 2, power is directly supplied to the navigator module, meanwhile, the USB power supply module 2 provides electric energy to the storage battery power supply module 3, and the storage battery stores the electric energy. And when the direct current power supply module 1 and the USB power supply module 2 are disconnected for power supply at the same time, the storage battery power supply module 3 starts to work, and the storage battery discharges, so that the storage battery provides electric energy for the navigator module to maintain the work of the navigator.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, 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 (9)
1. A power supply circuit for a navigation system, comprising:
the direct current power supply system comprises a direct current power supply module (1), wherein the output end of the direct current power supply module (1) is electrically connected with a navigator module, and the direct current power supply module (1) is used for converting alternating current electric energy into direct current electric energy and then transmitting the direct current electric energy to the navigator module for power supply;
the output end of the USB power supply module (2) is electrically connected with the navigator module, and the USB power supply module (2) is used for supplying electric energy to the navigator module by accessing an external power supply when the direct current power supply module (1) is disconnected from supplying power;
the navigator comprises a storage battery power supply module (3), the storage battery power supply module (3) is electrically connected with the USB power supply module (2), and the storage battery power supply module (3) is used for supplying power to the navigator module when the direct current power supply module (1) and the USB power supply module (2) are disconnected for power supply.
2. The power supply circuit of a navigation system according to claim 1, characterized in that: the direct current power supply module (1) is including being used for changing the alternating current of input into the rectifier unit (11) of direct current and being used for carrying out the first voltage regulating unit (12) of regulating voltage with the electric energy after the rectification, the output electric connection of rectifier unit (11) in the input of first voltage regulating unit (12), the output electric connection of first voltage regulating unit (12) in the input of navigator module.
3. The power supply circuit of a navigation system according to claim 2, characterized in that: first voltage regulating unit (12) include first steady voltage chip IC1 and be used for carrying out the first portion (121) that expands and flow to the output current of first steady voltage chip IC1, first steady voltage chip IC 1's input pin connect in the positive output of rectifier unit (11), first steady voltage chip IC 1's output pin electric connection in the input of navigator module, first portion (121) that expands with navigator module electric connection.
4. The power supply circuit of a navigation system according to claim 2, characterized in that: rectifier unit (11) include the rectifier bridge, the input electric connection of rectifier bridge has vary voltage module (4), the positive input of rectifier bridge, negative pole input respectively with the positive output of vary voltage module (4), negative pole output electric connection, the anodal output electric connection of rectifier bridge in the input of first voltage regulating unit (12), the negative pole output electric connection of rectifier bridge in the output of navigator module.
5. The power supply circuit of a navigation system according to claim 1, characterized in that: USB power module (2) are including being used for inserting external power source's USB input interface and being used for carrying out the second voltage regulating unit (21) of pressure regulating with the electric energy that USB input interface inserts, second voltage regulating unit (21) with USB input interface electric connection.
6. The power supply circuit of a navigation system according to claim 5, characterized in that: the second voltage regulating unit (21) includes second regulator chip IC2 and is used for carrying out the second that expands class portion (211) that expands class to the output current of second regulator chip IC2, the input pin electric connection of second regulator chip IC2 in USB input interface, the output pin electric connection of second regulator chip IC2 in the input of navigator module, just second expand class portion (211) with navigator module electric connection.
7. The power supply circuit of a navigation system according to claim 1, characterized in that: the battery power supply module (3) includes constant voltage chip IC3 and battery, constant voltage chip IC 3's power input pin with USB power supply module (2) electric connection, constant voltage chip IC 3's output pin with battery electric connection, just the anodal electric connection of battery in the navigator module.
8. The power supply circuit of a navigation system according to claim 7, characterized in that: the output electric connection of battery power module (3) has switch portion (5) that is used for controlling battery power module (3) break-make electricity, the output of switch portion (5) with navigator module electric connection.
9. The power supply circuit of a navigation system according to claim 8, characterized in that: switch portion (5) include with navigator module electric connection's relay KM, be controlled by relay KM's normally closed contact switch KM-1 and with constant voltage chip IC 3's output pin electric connection's manual switch SW, relay KM's positive pole with constant voltage chip's output electric connection, relay KM's negative pole ground connection, manual switch SW's output electric connection in normally closed contact switch KM-1's input, normally closed contact switch KM-1's output electric connection in the input of navigator module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220844311.6U CN217135220U (en) | 2022-04-13 | 2022-04-13 | Power supply circuit of navigation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220844311.6U CN217135220U (en) | 2022-04-13 | 2022-04-13 | Power supply circuit of navigation system |
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| CN217135220U true CN217135220U (en) | 2022-08-05 |
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| CN202220844311.6U Active CN217135220U (en) | 2022-04-13 | 2022-04-13 | Power supply circuit of navigation system |
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