Power supply circuit, vehicle-mounted wireless terminal and vehicle

Abstract

The utility model provides a power supply circuit, a vehicle-mounted wireless terminal and a vehicle, the power supply circuit is applied to the field of Internet of Vehicles, and the power supply circuit comprises a first power supply module, a second power supply module, a boost module, an output module, a first control branch and a second control branch; the first power supply module and the second power supply module are both connected with the output module, and the second power supply module is connected with the output module through the boost module; the control end of the boosting module is connected with the first control branch and the second control branch; when the first power supply module supplies power normally, the control end of the boosting module is conducted with the first control branch, so that the boosting module outputs first voltage; when the first power supply module supplies power abnormally, the control end of the boosting module is connected with the first control branch and the second control branch, so that the boosting module is switched from outputting the first voltage to outputting the second voltage. The power supply switching efficiency of the power supply circuit can be improved, and the power supply reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a power supply circuit, an in-vehicle wireless terminal, and a vehicle. Background Technology

[0002] Currently, the power supply circuit of T-BOX (Telematics control Box, vehicle-mounted wireless terminal) includes a main power supply and a backup power supply. When the main power supply fails, it switches to the backup power supply.

[0003] Since the backup power supply requires time to boost voltage, the power supply circuit is powered by functional components (such as capacitors) during the switching process between the main power supply and the backup power supply to ensure the continuous operation of the power supply circuit. The inclusion of functional components greatly increases the cost of the power supply circuit. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a power supply circuit, an in-vehicle wireless terminal, and a vehicle to solve the technical problem of increased cost of power supply circuits.

[0005] To achieve the above objectives, this utility model provides a power supply circuit, including a first power supply module, a second power supply module, a boost module, an output module, a first control branch, and a second control branch;

[0006] Both the first power supply module and the second power supply module are connected to the output module, and the second power supply module is connected to the output module through the boost module;

[0007] The control terminal of the boost module is connected to both the first control branch and the second control branch;

[0008] When the first power supply module is supplying power normally, the control terminal of the boost module is connected to the first control branch, so that the boost module outputs the first voltage;

[0009] When the first power supply module experiences a power supply malfunction, the control terminal of the boost module is connected to both the first control branch and the second control branch, thereby switching the boost module from outputting the first voltage to outputting the second voltage.

[0010] Furthermore, the power supply circuit also includes a monitoring branch, the control terminal of which is connected to the first power supply module, the input terminal of which is connected to the second power supply module, and the output terminal of which is grounded.

[0011] The monitoring branch is provided with a first node, and the control terminal of the second control branch is connected to the first node;

[0012] When the first power supply module is supplying power normally, the monitoring branch is controlled to be turned on, so that the first node controls the second control branch to be turned off.

[0013] When the first power supply module experiences a power supply malfunction, it controls the monitoring branch to shut down, so that the second power supply module can control the second control branch to be turned on through the first node.

[0014] Furthermore, the monitoring branch includes a first resistor and a first switch connected in series. The first resistor is connected to the input terminal of the monitoring branch, the control terminal of the first switch is connected to the control terminal of the monitoring branch, the output terminal of the first switch is connected to the output terminal of the monitoring branch, and the first node is located between the first resistor and the first switch.

[0015] Furthermore, the first control branch includes a second resistor and a third resistor connected in series. The second resistor is connected to the output terminal of the boost module, the third resistor is grounded, and a second node is provided between the second resistor and the third resistor. The control terminal of the boost module is connected to the first control branch through the second node.

[0016] Furthermore, the second control branch includes a second switch and a fourth resistor connected in series. The fourth resistor is connected to the second node, the output terminal of the second switch is grounded, and the control terminal of the second switch is connected to the control terminal of the second control branch.

[0017] Furthermore, both the first power supply module and the second power supply module are connected to the enable terminal of the boost module.

[0018] Furthermore, the power supply circuit also includes a contention module, which includes a contention output terminal, a first input terminal, and a second input terminal. The contention output terminal is connected to the output module, the first input terminal is connected to the first power supply module, and the second input terminal is connected to the output terminal of the boost module.

[0019] Furthermore, the competition module includes a third switch and a fourth switch. The control terminals of the third switch and the fourth switch are connected. The input terminal of the third switch is connected to the first input terminal of the competition module, and the output terminal of the third switch is connected to the competition output terminal. The input terminal of the fourth switch is connected to the second input terminal of the competition module, and the output terminal of the fourth switch is connected to the competition output terminal.

[0020] Based on the same inventive concept, this application also provides an in-vehicle wireless terminal, including the power supply circuit described above.

[0021] Based on the same inventive concept, this application also provides a vehicle, including the vehicle-mounted wireless terminal as described above.

[0022] As can be seen from the above description, the power supply circuit provided by this utility model includes a first power supply module connected to an output module and a second power supply module connected to the output module via a boost module. By connecting the control terminal of the boost module to a first control branch and a second control branch, when the first power supply module is functioning normally, the control terminal of the boost module is connected to the first control branch, and the boost module outputs a first voltage. When the first power supply module is malfunctioning, the control terminal of the boost module is connected to both the first and second control branches, and the boost module outputs a second voltage. This allows the second power supply module to switch its output voltage from the first voltage to the second voltage when the first power supply module malfunctions, thus avoiding the voltage of the second power supply module from 0 to the second voltage output. This significantly shortens the boost time of the second power supply module, achieving near-seamless switching and improving the power supply switching efficiency of the power supply circuit. Furthermore, the improved power supply switching efficiency eliminates the need for functional components in the power supply circuit, reducing material and space costs and avoiding the problem of large voltage fluctuations associated with functional components, thereby greatly improving the reliability of the power supply circuit. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a power supply circuit according to an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of a power supply circuit according to an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure of a power supply circuit according to an embodiment of the present invention. Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the structure of a power supply circuit according to an embodiment of the present invention. Figure 4 .

[0028] In the diagram: 100, First power supply module; 200, Second power supply module; 300, Boost module; 310, Control terminal of Boost module; 320, Output terminal of Boost module; 330, Enable terminal of Boost module; 400, Output module; 500, First control branch; 510, Second resistor; 520, Third resistor; 530, Second node; 600, Second control branch; 610, Control terminal of second control branch; 620, Second switch; 630, Fourth resistor; 700, Monitoring branch; 710, First node; 720, First resistor; 730, First switch; 800, Competition module; 810, Competition output terminal; 820, First input terminal; 830, Second input terminal; 840, Third switch; 850, Fourth switch. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] As described in the background section, the power supply circuit of the T-BOX includes a main power supply and a backup power supply. The backup power supply is used to replace the main power supply when the main power supply fails. Therefore, the power supply circuit has the function of switching from the main power supply to the backup power supply.

[0032] Current T-BOX power supply circuits incorporate functional components (such as capacitors) to provide power during the switching process between main and backup power supplies. However, these components are not only expensive but also prone to increasing voltage fluctuations during the switching process, negatively impacting the stability and reliability of the power supply circuit. Furthermore, when the performance of these components deteriorates, they pose a risk of failure, further reducing the reliability of the power supply circuit. The applicant has discovered a method to achieve continuous power supply during the switching process between main and backup power supplies without incorporating these functional components.

[0033] Based on this, this application proposes a power supply circuit, an in-vehicle wireless terminal, and a vehicle to improve the switching efficiency of the T-BOX power supply circuit and enhance the power supply reliability of the power supply circuit.

[0034] The present application will be described in detail below through one or more specific embodiments.

[0035] In some embodiments, a power supply circuit, such as Figure 1 As shown, it includes a first power supply module 100, a second power supply module 200, a boost module 300, an output module 400, a first control branch 500, and a second control branch 600;

[0036] Both the first power supply module 100 and the second power supply module 200 are connected to the output module 400, and the second power supply module 200 is connected to the output module 400 through the boost module 300;

[0037] The control terminal 310 of the boost module 300 is connected to both the first control branch 500 and the second control branch 600;

[0038] When the first power supply module 100 is supplying power normally, the control terminal 310 of the boost module 300 is connected to the first control branch 500 so that the boost module 300 outputs the first voltage;

[0039] When the first power supply module 100 experiences a power supply malfunction, the control terminal 310 of the boost module 300 is connected to both the first control branch 500 and the second control branch 600, so that the boost module 300 switches from outputting the first voltage to outputting the second voltage.

[0040] Specifically, the first power supply module 100 is the main power supply, and the second power supply module 200 is the backup power supply. The second power supply module 200 outputs power after being boosted by the boost module 300, in place of the first power supply module 100.

[0041] The first control branch 500 and the second control branch 600 are the output voltage control branches of the boost module 300. By setting the second control branch 600 to be on and off, the control terminal 310 of the boost module 300 changes the output voltage of the boost module 300. Based on this, the on and off of the second control branch 600 are associated with the first power supply module 100, so that when the first power supply module 100 is abnormal, the output voltage of the boost module 300 is changed and the power supply is switched to the second power supply module 200.

[0042] When the first power supply module 100 is supplying power normally, the second control branch 600 is turned off from the control terminal 310 of the boost module 300, and the first control branch 500 is turned on from the control terminal 310 of the boost module 300. The control terminal 310 of the boost module 300 controls the boost module 300 to output the first voltage. The first voltage does not supply power. At this time, the power supply circuit is still supplied by the first power supply module 100.

[0043] When the first power supply module 100 experiences a power supply malfunction, both the second control branch 600 and the first control branch 500 are connected to the control terminal 310 of the boost module 300. The control terminal 310 of the boost module 300 then controls the boost module 300 to output a second voltage to replace the first power supply module 100 in providing power.

[0044] During the switching process between the first power supply module 100 and the second power supply module 200, the output voltage of the boost module 300 changes from the first voltage to the second voltage for output. This time is synchronized with the time when the first power supply module 100 malfunctions. Furthermore, the boost module 300 continuously outputs voltage, which can ensure the power supply continuity of the power supply circuit and is beneficial to the power supply reliability of the power supply circuit.

[0045] In addition, the first voltage can be greater than or less than the second voltage. The setting of the first voltage is to shorten the time for the boost module 300 to boost from 0 to the second voltage, thereby enabling the power supply circuit to quickly switch to the second power supply module 200 for power supply when the first power supply module 100 is abnormal.

[0046] For example, the first voltage is 5V and the second voltage is 5.5V. When the first power supply module 100 is supplying power normally, the output voltage is greater than 5V. When the first power supply module 100 is supplying power abnormally, the output voltage is less than 5V. Therefore, when the first power supply module 100 is supplying power abnormally, the first voltage 5V output by the second power supply module 200 through the boost module 300 is greater than the output voltage of the first power supply module 100. The second power supply module 200 can then replace the first power supply module 100 to supply power, ensuring the reliability of the power supply circuit. When the first power supply module 100 is supplying power normally, the first voltage 5V is less than the output voltage of the first power supply module 100, and the first power supply module 100 supplies power.

[0047] In this embodiment, the first power supply module 100 is connected to the output module 400, and the second power supply module 200 is connected to the output module 400 via a boost module 300. The control terminal 310 of the boost module 300 is connected to the first control branch 500 and the second control branch 600. When the first power supply module 100 is supplying power normally, the control terminal 310 of the boost module 300 is connected to the first control branch 500, and the boost module 300 outputs a first voltage. When the first power supply module 100 is supplying power abnormally, the control terminal 310 of the boost module 300 is connected to both the first control branch 500 and the second control branch 600, and the boost module 300 outputs a first voltage. The second voltage output from 0 allows the second power supply module 200 to switch its output voltage from the first voltage to the second voltage when the first power supply module 100 malfunctions. This avoids the voltage of the second power supply module 200 rising from 0 to the second voltage output, greatly shortening the voltage rise time of the second power supply module 200, achieving near-seamless switching and improving the power supply switching efficiency of the power supply circuit. In addition, the improved power supply switching efficiency of the power supply circuit eliminates the need for functional components, which not only reduces the material and space costs of the power supply circuit but also avoids the problem of large voltage fluctuations of functional components, greatly improving the reliability of the power supply circuit.

[0048] The above embodiment describes that the second power supply module 200 of the power supply circuit is connected to the output module 400 through the boost module 300, and the output voltage of the boost module 300 is related to the state of the first power supply module 100. The second power supply module 200 is connected to the output module 400 through the boost module 300. The connection between the first power supply module 100 and the boost module 300 is described in detail below.

[0049] In some embodiments, such as Figure 2As shown, the power supply circuit also includes a monitoring branch 700, the control terminal of the monitoring branch 700 is connected to the first power supply module 100, the input terminal of the monitoring branch 700 is connected to the second power supply module 200, and the output terminal of the monitoring branch 700 is grounded.

[0050] The monitoring branch 700 is provided with a first node 710, and the control terminal 610 of the second control branch 600 is connected to the first node 710.

[0051] When the first power supply module 100 is powered normally, the monitoring branch 700 is turned on so that the first node 710 controls the second control branch 600 to turn off.

[0052] When the first power supply module 100 experiences a power supply malfunction, it controls the monitoring branch 700 to shut down, so that the second power supply module 200 controls the second control branch 600 to be turned on through the first node 710.

[0053] Specifically, the first node 710 on the monitoring branch 700 is connected to the control terminal 610 of the second control branch 600, so as to control the shutdown and opening of the second control branch 600 through the monitoring branch 700. The control terminal of the monitoring branch 700 is connected to the first power supply module 100, thereby realizing the shutdown and opening of the second control branch 600 through the power supply status of the first power supply module 100.

[0054] When the first power supply module 100 is supplying power normally, the monitoring branch 700 is turned on, and the electrical signal of the first node 710 controls the second control branch 600 to turn off. Consequently, the control terminal 310 of the boost module 300 is only connected to the first control branch 500, and the output terminal 320 of the boost module 300 outputs a first voltage. When the first power supply module 100 is supplying power abnormally, the monitoring branch 700 is turned off, and the electrical signal of the first node 710 controls the second control branch 600 to turn on. Consequently, the control terminal 310 of the boost module 300 is connected to both the first control branch 500 and the second control branch 600, and the output terminal 320 of the boost module 300 outputs a second voltage.

[0055] In this embodiment, the first power supply module 100 controls the switching on and off of the second control branch 600 through the monitoring branch 700, so that the output voltage of the boost module 300 is related to the power supply status of the first power supply module 100. The monitoring branch 700 is a hardware setting, that is, it realizes the automatic hardware switching of the power supply circuit. The hardware has high reliability, which greatly improves the switching reliability of the power supply circuit, while having the advantage of low cost.

[0056] The above embodiments clarify that the boost module 300 and the first power supply module 100 are connected to the second control branch 600 through the monitoring branch 700. The specific structure of the monitoring branch 700 is described in detail below.

[0057] In some embodiments, such as Figure 2 As shown, the monitoring branch 700 includes a first resistor 720 and a first switch 730 connected in series. The first resistor 720 is connected to the input terminal of the monitoring branch 700, the control terminal of the first switch 730 is connected to the control terminal of the monitoring branch 700, the output terminal of the first switch 730 is connected to the output terminal of the monitoring branch 700, and the first node 710 is located between the first resistor 720 and the first switch 730.

[0058] Specifically, the on / off state of the first switch 730 is related to the power supply status of the first power supply module 100. When the first power supply module 100 is supplying power normally, the first switch 730 is turned on. The first resistor 720 of the monitoring branch 700 and the first switch 730 form a complete circuit under the grounding effect and the power supply of the second power supply module 200. The voltage of the first node 710 is the voltage of the first switch 730 in this circuit. This voltage is low and cannot control the second control branch 600 to turn on. Therefore, the second control branch 600 is turned off, and the boost module... The control terminal 310 of block 300 is disconnected from the second control branch 600. When the first power supply module 100 is abnormally powered, the first switch 730 is turned off, and the monitoring branch 700 cannot be grounded, so a complete loop cannot be formed. The voltage of the first node 710 is the output voltage of the second power supply module 200 connected to the first resistor 720. This voltage can control the second control branch 600 to conduct. Therefore, the second control branch 600 is conducted, and the control terminal 310 of the boost module 300 is connected to the second control branch 600.

[0059] In this embodiment, the control terminal 610 of the second control branch 600 is connected to the first node 710 on the monitoring branch 700 located on the bracket of the first resistor 720 and the first switch 730, so as to control the on / off state of the second control branch 600 through the electrical signal of the first node 710. The electrical signal of the first node 710 is related to the on / off state of the monitoring branch 700, and the on / off state of the monitoring branch 700 is related to the power supply state of the first power supply module 100. In this way, the first power supply module 100 controls the on / off state of the second control branch 600, and then controls the output voltage of the boost module 300 through the first power supply module 100, so as to switch the output voltage of the boost module 300 from the first voltage to the second voltage, thereby improving the boost efficiency of the boost module 300 and the power supply reliability of the power supply circuit.

[0060] The above embodiments clarify the structure of the monitoring branch 700. The specific structures of the first control branch 500 and the second control branch 600 are described below to clarify the control process of the first control branch 500 and the second control branch 600 on the boost module 300.

[0061] In some embodiments, such as Figure 2 As shown, the first control branch 500 includes a second resistor 510 and a third resistor 520 connected in series. The second resistor 510 is connected to the output terminal 320 of the boost module 300, and the third resistor 520 is grounded. A second node 530 is provided between the second resistor 510 and the third resistor 520. The control terminal 310 of the boost module 300 is connected to the first control branch 500 through the second node 530.

[0062] Specifically, the first control branch 500 is connected to the output terminal 320 of the boost module 300 to form a complete loop under the voltage action and grounding action of the output terminal 320 of the boost module 300. The second node 530 is located between the second resistor 510 and the third resistor 520 of the first control branch 500. The control terminal 310 of the boost module 300 is connected to the second node 530 to control the output voltage of the boost module 300 through the second node 530. The voltage of the control terminal 310 of the boost module 300 is constant, that is, the voltage of the second node 530 is constant. The output voltage of the boost module 300 is generated based on the voltage of the second node 530, combined with the resistance values ​​of the second resistor 510 and the third resistor 520.

[0063] It should be noted that the boost module 300 can be a boost chip.

[0064] For example, if the voltage at the control terminal 310 of the boost module 300 is 0.5V, the second resistor 510 is 80Ω, and the third resistor 520 is 20Ω, then the output voltage of the boost module 300 = 0.5V / 20Ω / (80Ω+20Ω) = 2.5V.

[0065] In this embodiment, the first control branch 500 is connected to the control terminal 310 of the boost module 300 through the second node 530. The control terminal 310 of the boost module 300 controls the voltage of the output terminal 320 of the boost module 300 by controlling the voltage of the second node 530 to a constant value. Based on this, the output voltage of the boost module 300 can be controlled by controlling the on / off state of the second control branch 600 connected to the second node 530. The on / off state of the second control branch 600 is related to the power supply status of the first power supply module 100. In this way, the output voltage of the boost module 300 is related to the power supply status of the first power supply module 100, so that the second power supply module 200 can supply power through the second voltage output by the boost module 300 when the power supply status of the first power supply module 100 is abnormal, thus realizing a smooth switching of power supply between the first power supply module 100 and the second power supply module 200.

[0066] In some embodiments, such as Figure 2 As shown, the second control branch 600 includes a second switch 620 and a fourth resistor 630 connected in series. The fourth resistor 630 is connected to the second node 530. The output terminal of the second switch 620 is grounded, and the control terminal of the second switch 620 is connected to the control terminal 610 of the second control branch 600.

[0067] Specifically, the fourth resistor 630 of the second control branch 600 is connected to the second node 530, and the second switch 620 is grounded. Therefore, the second control branch 600 and the third resistor 520 are connected in parallel. When the second control branch 600 is on, the second resistor 510 and the parallel second control branch 600 and the third resistor 520 are connected in series. The resistance of the second resistor 510 remains unchanged, while the resistance of the parallel second control branch 600 and the third resistor 520 is lower than that of the third resistor 520. Therefore, when the output voltage of the boost module 300 remains unchanged, the voltage of the second node 530 will decrease. However, the second node 530 is connected to the control terminal 310 of the boost module 300, and the voltage of the control terminal 310 of the boost module 300 is a constant. In this case, the control terminal 310 of the boost module 300 controls the output voltage of the output terminal 320 of the boost module 300 to increase, thereby changing the output voltage of the boost module 300 from the first voltage to the second voltage.

[0068] For example, the voltage at the control terminal 310 of the boost module 300 is 0.5V, the second resistor 510 is 80Ω, the third resistor 520 is 20Ω, and the fourth resistor 630 on the second control branch 600 is 20Ω. Then, the resistance value of the third resistor 520 and the fourth resistor 630 connected in parallel is (20Ω*20Ω) / (20Ω+20Ω) = 10Ω, and the output voltage of the boost module 300 is 0.5V / 10Ω / (80Ω+10Ω) = 4.5V.

[0069] In this embodiment, the second control branch 600 is connected to the second node 530 and in parallel with the third resistor 520. When the second control branch 600 is turned on, it reduces the resistance in the loop formed by the output terminal 320 of the boost module 300, thereby reducing the voltage of the second node 530. The control terminal 310 of the boost module 300 is connected to the second node 530 and has a constant voltage. This allows the output voltage of the output terminal 320 of the boost module 300 to be increased without changing the voltage of the second node 530. This enables the second power supply module 200 to boost voltage after the first power supply module 100 malfunctions, and achieves power switching between the first power supply module 100 and the second power supply module 200. The configuration of the first control branch 500 and the second control branch 600 allows the boost module 300 to change its output voltage under hardware drive, greatly improving the reliability of the power supply circuit.

[0070] The above embodiments clarify the connection between the first power supply module 100 and the boost module 300. The following describes the enabling connection of the boost module 300 to clarify the enabling function of the boost module 300.

[0071] In some embodiments, such as Figure 3 As shown, both the first power supply module 100 and the second power supply module 200 are connected to the enable terminal 330 of the boost module 300.

[0072] Specifically, both the first power supply module 100 and the second power supply module 200 enable the boost module 300 to ensure its normal operation. By connecting both the first power supply module 100 and the second power supply module 200 to the enable terminal 330 of the boost module 300, the situation where the boost module 300 cannot be enabled due to an abnormality in the first power supply module 100 can be avoided. This ensures that the boost module 300 can be enabled whether the first power supply module 100 or the second power supply module 200 is supplying power. When the first power supply module 100 is supplying power normally, the output voltage of the second power supply module 200 is boosted to the first voltage. When the first power supply module 100 is supplying power abnormally, the output voltage of the second power supply module 200 is boosted from the first voltage to the second voltage. This achieves power switching between the first power supply module 100 and the second power supply module 200, reduces the time required for the second power supply module 200 to boost to the second voltage, improves working efficiency, and enhances the power supply reliability of the power supply circuit.

[0073] It should be noted that, in order to further improve the reliability of the power supply circuit, both the first power supply module 100 and the second power supply module 200 are connected to the enable terminal 330 of the boost module 300 through diodes.

[0074] The above embodiments clarify the working process of the first power supply module 100 and the second power supply module 200. The following describes in detail the conduction of the boost module 300 and the first power supply module 100 and the output module 400, so as to clarify that the output module 400 can maintain a continuous and stable output when the first power supply module 100 is in different power supply states.

[0075] In some embodiments, such as Figure 4 As shown, the power supply circuit also includes a contention module 800, which includes a contention output terminal 810, a first input terminal 820, and a second input terminal 830. The contention output terminal 810 is connected to the output module 400, the first input terminal 820 is connected to the first power supply module 100, and the second input terminal 830 is connected to the output terminal 320 of the boost module 300.

[0076] Specifically, the output terminals of the first power supply module 100 and the boost module 300 are both connected to the competing module 800. The competing module 800 determines the module that is connected to the output module 400 by comparing the output voltages of the first power supply module 100 and the boost module 300, i.e., it determines the module that will receive power. Since the input terminal of the boost module 300 is connected to the second power supply module 200, the competing module 800 essentially compares the first power supply module 100 and the second power supply module 200 to determine the module with the larger output voltage for power supply.

[0077] In this embodiment, the second power supply module 200 is connected to the competing module 800 through the boost module 300. The boost module 300 outputs a first voltage when the first power supply module 100 is supplying power normally, and outputs a second voltage when the first power supply module 100 is supplying power abnormally. The competing module 800 is configured to compare the output voltage of the first power supply module 100 with the first voltage when the first power supply module 100 is supplying power normally, and thus determine whether the first power supply module 100 should supply power. When the first power supply module 100 is supplying power abnormally, it compares the output voltage of the first power supply module 100 with the second voltage to determine whether the second power supply module 200 should supply power. In actual use, when the first power supply module 100 is abnormal, its output voltage usually drops linearly to 0. During this process, the second power supply module 200 can be directly supplied by the first voltage, and gradually boosted to the second voltage. This can ensure continuous power supply to the power supply circuit and avoid unstable output voltage of the power supply circuit, which is beneficial to improving the reliability of the power supply circuit.

[0078] The above embodiments clarify that both the boost module 300 and the first power supply module 100 are connected to the output module 400 through the contention module 800. The specific structure of the contention module 800 is described below to clarify the specific implementation of the contention module 800.

[0079] In some embodiments, such as Figure 4 As shown, the competition module 800 includes a third switch 840 and a fourth switch 850. The control terminals of the third switch 840 and the fourth switch 850 are connected. The input terminal of the third switch 840 is connected to the first input terminal 820 of the competition module 800, and the output terminal of the third switch 840 is connected to the competition output terminal 810. The input terminal of the fourth switch 850 is connected to the second input terminal 830 of the competition module 800, and the output terminal of the fourth switch 850 is connected to the competition output terminal 810.

[0080] Specifically, the input terminal of the third switch 840 is connected to the first power supply module 100 through the first input terminal 820, and the input terminal of the fourth switch 850 is connected to the output terminal 320 of the boost module 300 through the second input terminal 830. The voltage at the control terminal of the third switch 840 is the output voltage of the first power supply module 100, and the voltage at the control terminal of the fourth switch 850 is the output voltage of the boost module 300. When the control terminals of the third switch 840 and the fourth switch 850 are connected, the switch with the larger voltage value will conduct to achieve power supply.

[0081] It should be noted that, based on the power supply circuit having the competing module 800, the first voltage must be less than the second voltage and less than the output voltage of the first power supply module 100, so as to ensure that the first power supply module 100 can win over the boost module 300 to supply power when the power supply is normal.

[0082] For example, the third switch 840 and the fourth switch 850 are MOS transistors of the same specification.

[0083] In this embodiment, the competition module 800 compares the output voltages of the first power supply module 100 and the second power supply module 200 through the third switch 840 and the fourth switch 850, thereby realizing the competition between the two output voltages. The module with the larger output voltage is determined to be connected to the output module 400 for power supply. This not only enables automatic competition and switching between the first power supply module 100 and the second power supply module 200, but also automatically selects the module with the larger output voltage for power supply, thus ensuring the power supply reliability of the power supply circuit.

[0084] Based on the same inventive concept, this application also provides a vehicle-mounted wireless terminal, including the power supply circuit as described above, the beneficial effects of which are the same as those of the power supply circuit, and will not be repeated here.

[0085] Based on the same inventive concept, this application also provides a vehicle including the vehicle-mounted wireless terminal as described above, the beneficial effects of which are the same as those of the power supply circuit, and will not be repeated here.

[0086] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the scope of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity.

[0087] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power supply circuit, characterized by comprising: It includes a first power supply module, a second power supply module, a boost module, an output module, a first control branch, and a second control branch; Both the first power supply module and the second power supply module are connected to the output module, and the second power supply module is connected to the output module through the boost module; The control terminal of the boost module is connected to both the first control branch and the second control branch; When the first power supply module is supplying power normally, the control terminal of the boost module is connected to the first control branch, so that the boost module outputs the first voltage; When the first power supply module experiences a power supply malfunction, the control terminal of the boost module is connected to both the first control branch and the second control branch, thereby switching the boost module from outputting the first voltage to outputting the second voltage.

2. The power supply circuit according to claim 1, characterized in that, It also includes a monitoring branch, the control terminal of which is connected to the first power supply module, the input terminal of which is connected to the second power supply module, and the output terminal of which is grounded; The monitoring branch is provided with a first node, and the control terminal of the second control branch is connected to the first node; When the first power supply module is supplying power normally, the monitoring branch is controlled to be turned on, so that the first node controls the second control branch to be turned off. When the first power supply module experiences a power supply malfunction, it controls the monitoring branch to shut down, so that the second power supply module can control the second control branch to be turned on through the first node.

3. The power supply circuit of claim 2, wherein, The monitoring branch includes a first resistor and a first switch connected in series. The first resistor is connected to the input terminal of the monitoring branch, the control terminal of the first switch is connected to the control terminal of the monitoring branch, the output terminal of the first switch is connected to the output terminal of the monitoring branch, and the first node is located between the first resistor and the first switch.

4. The power supply circuit of claim 1, wherein, The first control branch includes a second resistor and a third resistor connected in series. The second resistor is connected to the output terminal of the boost module, and the third resistor is grounded. A second node is provided between the second resistor and the third resistor. The control terminal of the boost module is connected to the first control branch through the second node.

5. The power supply circuit according to claim 4, characterized in that, The second control branch includes a second switch and a fourth resistor connected in series. The fourth resistor is connected to the second node. The output terminal of the second switch is grounded. The control terminal of the second switch is connected to the control terminal of the second control branch.

6. The power supply circuit of claim 1, wherein, Both the first power supply module and the second power supply module are connected to the enable terminal of the boost module.

7. The power supply circuit of claim 1, wherein, It also includes a competition module, which includes a competition output terminal, a first input terminal and a second input terminal. The competition output terminal is connected to the output module, the first input terminal is connected to the first power supply module, and the second input terminal is connected to the output terminal of the boost module.

8. The power supply circuit of claim 7, wherein, The competition module includes a third switch and a fourth switch. The control terminals of the third switch and the fourth switch are connected. The input terminal of the third switch is connected to the first input terminal of the competition module, and the output terminal of the third switch is connected to the competition output terminal. The input terminal of the fourth switch is connected to the second input terminal of the competition module, and the output terminal of the fourth switch is connected to the competition output terminal.

9. A vehicle-mounted wireless terminal, characterized by comprising: Includes the power supply circuit as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Including the vehicle-mounted wireless terminal as described in claim 9.

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