Power supply circuit, vehicle-mounted wireless terminal and vehicle

Abstract

The utility model discloses a power supply circuit, a vehicle-mounted wireless terminal and a vehicle, the power supply circuit is applied to the technical field of vehicle-mounted wireless terminals, and the power supply circuit comprises a first power supply module, a second power supply module, an output module, a control module, a monitoring module and a feedback module; the first power supply module and the second power supply module are connected with the output module. The control module is connected with the enabling end of the first power supply module and the enabling end of the second power supply module. The monitoring module comprises a monitoring node used for monitoring electric signals of the first power supply module. The feedback module is connected with the monitoring node and the control module. When the electric signal of the monitoring node is abnormal, the electric signal of the monitoring node enables the feedback module to output a power supply abnormal signal, and the control module disables the first power supply module and enables the second power supply module after receiving the power supply abnormal signal. The cost of the power supply circuit is reduced, and popularization and application of the power supply circuit are further facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially relates to a power supply circuit, vehicle wireless terminal and vehicle. BACKGROUND

[0002] At present, the power supply circuit of T-BOX (Telematics control Box, vehicle wireless terminal) includes main power supply and standby power supply, enables standby power supply when the output voltage of main power supply is lower than preset voltage, completes the switching of main power supply and standby power supply. The switching process of main power supply and standby power supply of the existing T-BOX power supply circuit relies on functional components to be realized, when the performance of functional components reduces, it is easy to cause the reliability of power supply circuit to reduce. SUMMARY

[0003] Therefore, the utility model discloses a power supply circuit, vehicle wireless terminal and vehicle to solve the problem of the reliability of power supply circuit.

[0004] In order to achieve the above purpose, the utility model provides a power supply circuit, including first power supply module, second power supply module, output module, control module, monitoring module and feedback module,

[0005] First power supply module, second power supply module all are connected with output module, and the control module is connected with the enable end of first power supply module and second power supply module respectively,

[0006] Monitoring module includes the monitoring node for monitoring the electric signal of first power supply module, and feedback module is connected with monitoring node and control module respectively,

[0007] When the electric signal of monitoring node is abnormal, the electric signal of monitoring node enables feedback module to output power supply abnormal signal, and control module disables first power supply module after receiving power supply abnormal signal and enables second power supply module.

[0008] Further, the power supply circuit further includes reference power supply, the feedback module includes feedback input end, feedback output end and feedback enable end, the feedback enable end is connected with monitoring node, the feedback input end is connected with reference power supply, and the feedback output end is connected with control module,

[0009] When the electric signal of monitoring node is abnormal, reference power supply, feedback input end and feedback output end are turned on, and power supply abnormal signal is outputted to control module by feedback output end.

[0010] Further, the monitoring module comprises a first switch tube, the first switch tube comprises a first input end and a first output end, the first input end is connected with the first power supply module, and the first output end is connected with the monitoring node.

[0011] Further, the monitoring module further comprises a first resistor and a second resistor, the first resistor, the first switch tube and the second resistor are sequentially connected, the first resistor is connected with the first power supply module, and the second resistor is grounded.

[0012] The monitoring node is located between the first switch tube and the second resistor.

[0013] Further, the first switch tube is a triode, wherein the emitter of the triode is the first input end, and the base of the triode is the first output end.

[0014] Further, the power supply circuit further comprises a charging module, the charging module comprises a charging input end, a charging output end and a charging enable end, the charging input end is connected with the first power supply module, the charging output end is connected with the second power supply module, the charging enable end is connected with the control module, and the control module periodically sends an enable signal to the charging enable end.

[0015] When the control module sends the enable signal to the charging enable end, the charging module is turned on, and the first power supply module charges the second power supply module.

[0016] Further, the charging module comprises a second switch tube, a charging resistor, a third switch tube and a voltage stabilizing resistor, the second switch tube comprises a second input end, a second output end and a second enable end, and the third switch tube comprises a third input end, a third output end and a third enable end.

[0017] One end of the charging resistor is connected with the charging input end, the other end of the charging resistor is connected with the second input end, the second output end is connected with the charging output end, one end of the voltage stabilizing resistor close to the charging input end of the charging resistor is connected, the other end of the voltage stabilizing resistor is connected with the second enable end, the second enable end is connected with the third input end, the third output end is grounded, and the third enable end is connected with the charging enable end.

[0018] Further, the charging module further comprises a fourth switch tube, the fourth switch tube is connected with the voltage stabilizing resistor in parallel, the fourth switch tube comprises a fourth enable end, and the fourth enable end is connected with the other end of the charging resistor away from the charging input end.

[0019] Based on the same inventive concept, the application further provides a vehicle-mounted wireless terminal comprising the power supply circuit.

[0020] Based on the same inventive concept, the application also provides a vehicle comprising the vehicle-mounted wireless terminal.

[0021] From the above, it can be seen that the power supply circuit provided by the utility model, through setting the monitoring node for monitoring the electric signal of the first power supply module on the monitoring module, and connecting the monitoring node with the feedback module, the feedback module is connected with the control module, so that when the monitoring node monitors the abnormal electric signal of the first power supply module, the abnormal electric signal is generated, and the feedback module is enabled, the feedback module generates the power supply abnormal signal and sends it to the control module, so that the control module realizes the disablement of the first power supply module and the enablement of the second power supply module, and completes the switching of the first power supply module and the second power supply module, so as to ensure the normal operation of the output module and avoid the influence of the power supply abnormality of the first power supply module on the normal operation of the output module. The feedback module of the power supply circuit provided by the application can send the power supply abnormal signal to the control module when the electric signal of the first power supply module is abnormal, and complete the switching of the first power supply module and the second power supply module through the simultaneous control of the control module, and uninterrupted power supply in the switching process, which is beneficial to improve the switching reliability of the first power supply module and the second power supply module, and further beneficial to improve the reliability of the power supply circuit. The power supply circuit controls the feedback module to send the power supply abnormal signal to the control module through the electric signal of the monitoring node of the monitoring module, without the aid of other monitoring devices, which is beneficial to reduce the cost of the power supply circuit, and further beneficial to the popularization and application of the power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0023] Figure 1 Structure diagram of power supply circuit for the embodiment of the utility model Figure 1 ;

[0024] Figure 2 Structure diagram of power supply circuit for the embodiment of the utility model Figure 2 ;

[0025] Figure 3 Structure diagram of power supply circuit for the embodiment of the utility model Figure 3 ;

[0026] Figure 4 Structure diagram of power supply circuit for the embodiment of the utility model Figure 4 ;

[0027] Figure 5 Structure diagram of the charging module of the embodiment of the utility model.

[0028] In the figure: 100, first power supply module;200, second power supply module;300, output module;400, control module;500, monitoring module;510, monitoring node;520, first switch tube;521, first input terminal;522, first output terminal;530, first resistor;540, second resistor;600, feedback module;610, feedback input terminal;620, feedback output terminal;630, feedback enable terminal;700, reference power supply;800, charging module;810, charging input terminal;820, charging output terminal;830, charging enable terminal;840, second switch tube;841, second input terminal;842, second output terminal;843, second enable terminal;850, charging resistor;860, third switch tube;861, third input terminal;862, third output terminal;863, third enable terminal;870, voltage stabilizing resistor;880, fourth switch tube;881, fourth enable terminal;882, fourth input terminal;883, fourth output terminal. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the following will be combined with specific embodiments, and referring to the drawings, the utility model will be further explained in detail.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the utility model should be understood as the usual meaning by those skilled in the art to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] With the continuous evolution of vehicle intelligence, T-BOX has become a standard part of vehicles. Currently, T-BOX can provide remote control, FOTA (Firmware Over The Air, mobile terminal software upgrade over the air), B CALL (Breakdown Call, road rescue call), E CALL (Emergency Call, emergency rescue call), data upload, data download and other services. In order to ensure that the main power supply can be seamlessly switched to the standby power supply for power supply after the main power supply is powered off, so as to ensure that the T-BOX can still operate normally for a period of time when the car has an accident or system failure, and emergency calls and vehicle condition information upload can be made. Therefore, a safe and reliable power supply circuit is very important.

[0032] The power supply circuit of the T-BOX can monitor the main power supply, so as to quickly switch to the standby power supply for power supply when the main power supply has insufficient power supply capacity, so as to meet the power consumption demand of the T-BOX.

[0033] The existing power supply circuit includes two kinds. One kind of power supply circuit needs capacitor filtering and multiple reading, which leads to slow reading speed and prolongs the reaction time of the main power supply and the standby power supply switching. During the switching reaction process of the main power supply and the standby power supply, a large capacitor is used to supply power to the T-BOX to maintain the continuity of the power supply of the T-BOX, and the cost of the large capacitor is relatively high. Based on this, another kind of power supply circuit monitors the main power supply through a voltage monitoring chip, so as to quickly switch to the standby power supply for power supply when the main power supply has insufficient power supply capacity. The cost of the voltage monitoring chip is lower than that of the large capacitor, but the voltage monitoring chips of various manufacturers are not compatible. When the voltage monitoring chip used in the power supply circuit is out of stock, it is difficult to replace the voltage monitoring chip, which affects the normal use of the T-BOX and leads to the decrease of the reliability of the power supply circuit.

[0034] The present application provides a kind of power supply circuit, vehicle-mounted wireless terminal and vehicle, to reduce the cost of power supply circuit, while improving the reliability of power supply circuit.

[0035] The present application is described in detail below by one or more specific embodiments.

[0036] The present application provides a kind of power supply circuit, as shown in Figure 1 It includes first power supply module 100, second power supply module 200, output module 300, control module 400, monitoring module 500 and feedback module 600;

[0037] The first power supply module 100, the second power supply module 200 are connected with the output module 300, and the control module 400 is connected with the enable end of the first power supply module 100 and the second power supply module 200 respectively;

[0038] The monitoring module 500 comprises a monitoring node 510 for monitoring the electrical signal of the first power supply module 100, and the feedback module 600 is connected to the monitoring node 510 and the control module 400 respectively.

[0039] When the electrical signal of the monitoring node 510 is abnormal, the electrical signal of the monitoring node 510 enables the feedback module 600 to output a power supply abnormal signal, and the control module 400 disables the first power supply module 100 and enables the second power supply module 200 after receiving the power supply abnormal signal.

[0040] Specifically, when the electrical signal of the first power supply module 100 is normal, the control module 400 enables the first power supply module 100, and the first power supply module 100 is turned on with the output module 300 to supply power through the output module 300, and the control module 400 disables the second power supply module 200, and the second power supply module 200 is turned off with the output module 300.

[0041] The monitoring module 500 is connected to the first power supply module 100 to enable the monitoring node 510 to monitor the electrical signal of the first power supply module 100, and when the electrical signal of the first power supply module 100 is normal, the electrical signal of the monitoring node 510 is normal, and when the electrical signal of the first power supply module 100 is abnormal, the electrical signal of the monitoring node 510 is abnormal.

[0042] The feedback module 600 is connected to the monitoring node 510 and the control module 400, and when the electrical signal of the monitoring node 510 is normal, the feedback module 600 is disabled, the control module 400 cannot receive the electrical signal of the feedback module 600, and the first power supply module 100 is enabled and the second power supply module 200 is disabled; when the electrical signal of the monitoring node 510 is abnormal, the feedback module 600 is enabled to output a power supply abnormal signal, and the control module 400 disables the first power supply module 100 and enables the second power supply module 200 after receiving the power supply abnormal signal, that is, the second power supply module 200 is turned on with the output module 300, the first power supply module 100 is turned off with the output module 300, and the switching of the first power supply module 100 and the second power supply module 200 is realized.

[0043] For example, the first power supply module 100 comprises a main power supply and a main power supply conversion module connected in sequence, the second power supply module 200 comprises a backup power supply and a backup power supply conversion module connected in sequence, the enable end of the first power supply module 100 is connected with the enable end of the main power supply conversion module, the enable end of the second power supply module 200 is connected with the enable end of the backup power supply conversion module, when the control module 400 enables the first power supply module 100, the main power supply conversion module is turned on, and correspondingly, the main power supply is turned on with the output module 300, that is, the first power supply module 100 is turned on with the output module 300; similarly, when the control module 400 disables the second power supply module 200, the backup power supply conversion module is turned off, and correspondingly, the backup power supply is turned off with the output module 300, the second power supply module 200 is turned off with the output module 300.

[0044] For example, the monitoring node 510 monitors the electrical signal of the first power supply module 100, which is voltage, when the voltage value of the monitoring node 510 is reduced to less than or equal to a threshold voltage, it is considered that the voltage of the monitoring node 510 is abnormal. When the voltage of the monitoring node 510 is abnormal, the feedback module 600 outputs a power supply abnormal signal to the control module 400.

[0045] For example, the control module 400 is an MCU (Microcontroller Unit; microcontroller unit).

[0046] In the embodiment, the monitoring node 510 is arranged on the monitoring module 500 to monitor the electrical signal of the first power supply module 100, and the monitoring node 510 is connected with the feedback module 600, and the feedback module 600 is connected with the control module 400, so that when the monitoring node 510 monitors the abnormal electrical signal of the first power supply module 100, the feedback module 600 generates the abnormal electrical signal and is enabled, the feedback module 600 generates the power supply abnormal signal and sends it to the control module 400, so that the control module 400 realizes the disablement of the first power supply module 100 and the enablement of the second power supply module 200, completes the switching of the first power supply module 100 and the second power supply module 200, and ensures the normal operation of the output module 300, avoiding the influence of the power supply abnormality of the first power supply module 100 on the normal operation of the output module 300. The feedback module 600 of the power supply circuit provided in the application can send the power supply abnormal signal to the control module 400 when the electrical signal of the first power supply module 100 is abnormal, and complete the switching of the first power supply module 100 and the second power supply module 200 through the simultaneous control of the control module 400, so as to realize uninterrupted power supply during the switching process, which is beneficial to improve the switching reliability of the first power supply module 100 and the second power supply module 200, and further beneficial to improve the reliability of the power supply circuit. The power supply circuit controls the feedback module 600 to send the power supply abnormal signal to the control module 400 through the electrical signal of the monitoring node 510 of the monitoring module 500, without the aid of other monitoring devices, which is beneficial to reduce the cost of the power supply circuit, and further beneficial to the popularization and application of the power supply circuit.

[0047] The above embodiment clearly defines the functional relationship between the feedback module 600 and the monitoring node 510. The specific structure of the feedback module 600 and the process of sending the power supply abnormal signal are described in detail below.

[0048] In some embodiments, as shown in Figure 2 The power supply circuit further includes a reference power supply 700, the feedback module 600 includes a feedback input end 610, a feedback output end 620 and a feedback enable end 630, the feedback enable end 630 is connected with the monitoring node 510, the feedback input end 610 is connected with the reference power supply 700, and the feedback output end 620 is connected with the control module 400.

[0049] When the electrical signal of the monitoring node 510 is abnormal, the reference power supply 700, the feedback input end 610 and the feedback output end 620 are turned on, and the feedback output end 620 outputs the power supply abnormal signal to the control module 400.

[0050] Specifically, the feedback module 600 can be a triode, the feedback input end 610 is the emitter of the triode, the feedback output end 620 is the collector of the triode, and the feedback enable end 630 is the base of the triode. When the electrical signal of the monitoring node 510 is abnormal, the triode is turned on, that is, the feedback input end 610 and the feedback output end 620 are turned on, and correspondingly, the reference power supply 700 is turned on through the feedback module 600 and the control module 400. The electrical signal received by the control module 400 is the power supply abnormal signal.

[0051] In addition, when the electrical signal of the monitoring node 510 is normal, the feedback input end 610 and the feedback output end 620 are turned off, the reference power supply 700 is turned off with the control module 400, and the control module 400 cannot receive the electrical signal, that is, the control module 400 cannot receive the power supply abnormal signal, and the control module 400 does not perform any operation.

[0052] For example, the electrical signal monitored by the monitoring node 510 is voltage. When the voltage of the first power supply module 100 decreases to be abnormal, the voltage of the monitoring node 510 also decreases to be abnormal, the voltage of the monitoring node 510 enables the feedback enable end 630, the feedback input end 610 and the feedback output end 620 are turned on, the reference power supply 700 and the feedback module 600 are turned on, and the control module 400 receives the power supply abnormal signal. The feedback module 600 is a triode, the voltage of the base of the triode decreases, so that the voltage difference between the emitter and the base of the triode reaches the turn-on voltage of the triode, and the triode (that is, the feedback module 600) is turned on.

[0053] For example, the threshold voltage value is related to the voltage value of the reference power supply 700 connected to the input end of the feedback module 600 and the turn-on voltage of the feedback module 600. The voltage value of the reference power supply 700 is 5V, and the turn-on voltage of the feedback module 600 is 1V, so the threshold voltage = 5V-1V = 4V, that is, when the voltage of the monitoring node 510 decreases to be lower than 4V, the feedback module 600 is turned on. Therefore, on this basis, in combination with the output voltage of the first power supply module 100, the voltage of the monitoring node 510 is set to associate the threshold voltage of the monitoring node 510 with the abnormal output voltage of the first power supply module 100, so as to realize the abnormal monitoring of the output voltage of the first power supply module 100.

[0054] In this embodiment, the reference power supply 700 serves as a signal generating end, and is capable of outputting a power supply abnormality signal to the control module 400 through the feedback output end 620 when the feedback input end 610 and the feedback output end 620 of the feedback module 600 are turned on, so that the control module 400 controls the first power supply module 100 and the second power supply module 200 to be enabled or disabled, thereby realizing switching of the first power supply module 100 and the second power supply module 200, and improving the communication efficiency of the feedback module 600 and the control module 400, and further improving the operation reliability of the power supply circuit.

[0055] The above embodiment discloses the specific process in which the monitoring node 510 enables the feedback module 600 to send a power supply abnormality signal, but does not disclose the specific position and monitoring content of the monitoring node 510. The monitoring module 500 is described in detail below to disclose the specific position and monitoring content of the monitoring node 510.

[0056] In some embodiments, as shown in Figure 3 The monitoring module 500 includes a first switch tube 520, the first switch tube 520 includes a first input end 521 and a first output end 522, the first input end 521 is connected with the first power supply module 100, and the first output end 522 is connected with the monitoring node 510.

[0057] Specifically, when the electric signal of the first power supply module 100 is normal, the first input end 521 and the first output end 522 are turned on, the electric signal of the monitoring node 510 is normal, correspondingly, the monitoring node 510 disables the feedback enable end 630, and the feedback input end 610 and the feedback output end 620 are turned off.

[0058] When the electric signal of the first power supply module 100 is abnormal, the electric signal of the monitoring node 510 is abnormal, correspondingly, the feedback module 600 is turned on, the electric signal of the monitoring node 510 becomes the electric signal of the feedback module 600 after being turned on, correspondingly, the electric signal of the first output end 522 of the first switch tube 520 becomes the electric signal of the feedback module 600 after being turned on, the first input end 521 and the first output end 522 are turned off, that is, the first switch tube 520 is turned off, and the feedback module 600 sends the power supply abnormality signal to the control module 400.

[0059] For example, the monitoring node 510 monitors the voltage of the first power supply module 100, the on voltage of the first switch tube 520 is 1V, the on voltage of the feedback module 600 is also 1V, the voltage of the first power supply module 100 is 5V, and the voltage of the reference power supply 700 connected to the feedback input end 610 is 4V; when the voltage of the first power supply module 100 is the normal value 5V, the first switch tube 520 is turned on, the voltage of the monitoring node 510 is 4V, the voltage of the feedback enable end 630 is equal to the voltage of the monitoring node 510, i.e. 4V, the voltage difference between the feedback input end 610 and the feedback enable end 630 is 0, the feedback module 600 is turned off, and correspondingly, the feedback module 600 cannot send the power supply abnormal signal to the control module 400; when the voltage of the first power supply module 100 is the abnormal value 3V, the first switch tube 520 is turned on, the voltage of the feedback enable end 630 is 2V, the voltage difference between the feedback input end 610 and the feedback enable end 630 is 2V, which reaches the on voltage of the feedback module 600, the feedback module 600 is turned on, and correspondingly, the voltage of the monitoring node 510 becomes the difference between the voltage of the reference voltage and the on voltage of the feedback module 600, i.e. 3V, and correspondingly, the voltage difference between the first input end 521 and the first output end 522 is less than 1V, and the first switch tube 520 is turned off.

[0060] In the embodiment, the first switch tube 520 is configured such that the electrical signal of the monitoring node 510 is associated with the on-off of the first switch tube 520, and the on-off of the first switch tube 520 is related to the electrical signal of the first power supply module 100; when the electrical signal of the first power supply module 100 is normal, the first switch tube 520 is turned on; when the electrical signal of the first power supply module 100 is abnormal, the first switch tube 520 is turned off, thereby realizing that the electrical signal of the monitoring node 510 is related to the electrical signal of the first power supply module 100, which is beneficial to enable or disable the feedback enable end 630 by the monitoring node 510, realizes that the electrical signal of the monitoring node 510 is associated with the on-off of the feedback module 600, and further realizes that the electrical signal of the monitoring node 510 is associated with the feedback output end 620 sending the power supply abnormal signal to the control module 400, and realizes controlling the power supply switching of the first power supply module 100 and the second power supply module 200 based on the state of the first power supply module 100. The first switch tube 520, the feedback module 600 and the reference power supply 700 have strong compatibility and low cost, which is beneficial to reduce the cost of the power supply circuit and improve the practicability and application promotion of the power supply circuit.

[0061] The above embodiments describe the position of the monitoring node 510 and the devices included in the monitoring module 500. On this basis, the monitoring module 500 further includes other devices to adjust the threshold of the abnormal electrical signal of the monitoring node 510.

[0062] In some embodiments, as shown in FIG. 5, the monitoring module 500 further includes a first resistor 530 and a second resistor 540. The first resistor 530, the first switch tube 520, and the second resistor 540 are connected in sequence. The first resistor 530 is connected to the first power supply module 100, and the second resistor 540 is grounded. Figure 3

[0063] The monitoring node 510 is located between the first switch tube 520 and the second resistor 540.

[0064] Specifically, the first resistor 530 is connected to the output end of the first power supply module 100. The monitoring node 510 is connected to the first power supply module 100 through the first switch tube 520 and the first resistor 530 to monitor the output electrical signal of the first power supply module 100.

[0065] The on-off of the first switch tube 520 is related to the electrical signal of the monitoring module 500, and accordingly related to the electrical signal of the first power supply module 100. The state of the first switch tube 520 is used to monitor the electrical signal of the first power supply module 100. The first resistor 530 and the second resistor 540 are used to adjust the electrical signal of the monitoring node 510 to determine the threshold of the abnormal electrical signal of the monitoring node 510, which is conducive to the flexibility of the power supply circuit.

[0066] For example, the electrical signal of the monitoring node 510 is voltage. The monitoring node 510 is located between the first switch tube 520 and the second resistor 540. The voltage of the monitoring node 510 is the voltage of the second resistor 540 when the monitoring module 500 is turned on. The voltage of the monitoring node 510 is compared with the on-voltage of the feedback enable end 630. When the voltage of the monitoring node 510 is less than or equal to the voltage of the feedback enable end 630 (i.e., the threshold voltage) (i.e., the electrical signal of the monitoring node 510 is abnormal), the first switch tube 520 is turned off, the feedback input end 610 and the feedback output end 620 are turned on, and the feedback module 600 outputs the power supply abnormal signal to the control module 400.

[0067] ​In the embodiment, the monitoring node 510 monitors the electrical signal between the first switch tube 520 and the second resistor 540 to monitor the electrical signal of the first power supply module 100. When the first power supply module 100 supplies power normally, the monitoring module 500 forms a loop, which is beneficial to the monitoring stability of the monitoring module 500 and the reliability of the power supply circuit.

[0068] The above embodiment discloses the devices included in the monitoring module 500. The specific device type of the first switch tube 520 of the monitoring module 500 is limited to further clarify the operation principle of the first switch tube 520.

[0069] In some embodiments, the first switch tube 520 is a triode, wherein the emitter of the triode is the first input end 521, and the base of the triode is the first output end 522.

[0070] Specifically, the feedback module 600 is a triode, and the feedback module 600 is connected to the first output end 522 of the first switch tube 520. The first switch tube 520 is set to be the same triode as the feedback module 600, which can ensure that the feedback module 600 and the first switch tube 520 have the same specifications and characteristics, and is beneficial to the competition between the feedback module 600 and the first switch tube 520 on the monitoring node 510, which is beneficial to the fairness of the competition and the reliability of the power supply circuit.

[0071] The threshold voltage of the monitoring node 510 in the power supply circuit is specifically and exemplarily described as follows.

[0072] Exemplarily, the monitoring node 510 monitors the output voltage of the first power supply module 100. The on-voltage of the first switch tube 520 is 1V, the resistance of the first resistor 530 is 20Ω, the resistance of the second resistor 540 is 60Ω, and the normal value of the output voltage of the first power supply module 100 is 10V. When the output voltage of the first power supply module 100 is lower than 5V, it is an abnormal value. Therefore, the threshold voltage of the monitoring node 510 can be calculated according to the resistance of the first resistor 530, the resistance of the second resistor 540, and the on-voltage of the first switch tube 520. That is, when the voltage of the monitoring node 510 is less than or equal to the threshold voltage, it is determined that the voltage value of the monitoring node 510 is abnormal.

[0073] The threshold voltage is (5-1) / (60+20)*60=3V. That is, when the output voltage of the first power supply module 100 is 5V, the voltage of the monitoring node 510 is 3V.

[0074] Therefore, in order to ensure that the voltage of the monitoring node 510 is less than or equal to 3V, the feedback module 600 is turned on, and the voltage of the feedback enable end 630 is set to be equal to 3V when the reference power supply 700 is turned on, that is, the voltage of the reference power supply 700 is set to be 4V, and the turn-on voltage of the feedback module 600 is 1V.

[0075] The above-mentioned embodiments describe the process of power supply monitoring and switching of the power supply circuit between the first power supply module 100 and the second power supply module 200. The following describes the process of charging the second power supply module 200 by the first power supply module 100, so as to protect the charging process.

[0076] In some embodiments, as shown in Figure 4 The power supply circuit further includes a charging module 800, the charging module 800 includes a charging input end 810, a charging output end 820 and a charging enable end 830, the charging input end 810 is connected with the first power supply module 100, the charging output end 820 is connected with the second power supply module 200, and the charging enable end 830 is connected with the control module 400. The control module 400 periodically sends an enable signal to the charging enable end 830.

[0077] When the control module 400 sends an enable signal to the charging enable end 830, the charging module 800 is turned on, and the first power supply module 100 charges the second power supply module 200.

[0078] Specifically, the charging module 800 is used to turn on the first power supply module 100 and the second power supply module 200, so that the first power supply module 100 charges the second power supply module 200, to ensure that the power of the second power supply module 200 is sufficient.

[0079] The control module 400 controls the charging module 800 to be turned on periodically, so that the first power supply module 100 can periodically charge the second power supply module 200, which is beneficial to ensure the power of the second power supply module 200.

[0080] Specifically, the first power supply module 100 includes a main power supply, and the second power supply module 200 includes a backup power supply. The main power supply and the backup power supply are connected through the charging module 800 to charge the backup power supply. The backup power supply can replace the main power supply to supply power when the main power supply fails or is abnormal. Therefore, the backup power supply is used less frequently, and if it is not used for a long time, the power of the backup power supply will be lost, affecting the emergency use of the backup power supply. Therefore, the control module 400 controls the on-off of the charging module 800, so that the main power supply can periodically charge the backup power supply, ensuring the effectiveness of the backup power supply, avoiding the situation that the second power supply module has no power output when the first power supply module switches to the second power supply module for power supply, and thus improving the reliability of the power supply circuit.

[0081] The above embodiment describes the charging module 800, which is periodically turned on to periodically supply power from the first power supply module 100 to the second power supply module 200, thereby ensuring that the second power supply module 200 can have power output. The specific structure of the charging module 800 is described below to further clarify the specific structure of the charging module 800.

[0082] In some embodiments, as shown in Figure 5 The charging module 800 includes a second switch tube 840, a charging resistor 850, a third switch tube 860, and a voltage stabilizing resistor 870. The second switch tube 840 includes a second input end 841, a second output end 842, and a second enable end 843. The third switch tube 860 includes a third input end 861, a third output end 862, and a third enable end 863.

[0083] One end of the charging resistor 850 is connected to the charging input end 810, and the other end is connected to the second input end 841. The second output end 842 is connected to the charging output end 820. One end of the voltage stabilizing resistor 870 is connected to one end of the charging resistor 850 close to the charging input end 810. The other end of the voltage stabilizing resistor 870 is connected to the second enable end 843. The second enable end 843 is connected to the third input end 861. The third output end 862 is grounded. The third enable end 863 is connected to the charging enable end 830.

[0084] Specifically, the charging resistor 850 is configured to reduce the charging current when the first power supply module 100 charges the second power supply module 200, thereby improving the charging safety of the charging module 800. The on-off of the second switch tube 840 is associated with the on-off of the charging module 800, and the on-off of the third switch tube 860 is associated with the on-off of the second switch tube 840. The control module 400 controls the on-off of the second switch tube 840 by controlling the on-off of the third switch tube 860.

[0085] Specifically, the on-off of the third switch tube 860 is associated with the on-off of the second switch tube 840 through the voltage stabilizing resistor 870. When the third switch tube 860 is off, the first power supply module 100 and the voltage stabilizing resistor 870 do not form a loop, the second enable end 843 of the second switch tube 840 receives the electrical signal of the first power supply module 100 to control the second switch tube 840 to be off, and correspondingly, the charging module 800 is off. When the third switch tube 860 is on, the first power supply module 100 and the voltage stabilizing resistor 870 form a loop, the second enable end 843 receives the electrical signal of the first power supply module 100 to control the second switch tube 840 to be on, and correspondingly, the charging module 800 is on. In this way, the control module 400 can control the on-off of the charging module 800.

[0086] Specifically, the third switch tube 860 is an NPN type triode (i.e., on when a high voltage is applied to the base), and the second switch tube 840 is a PNP type triode (i.e., off when a high voltage is applied to the base). When the control module 400 sends a high voltage signal to the third enable end 863 of the third switch tube 860 to enable the third switch tube 860 to be on, the first power supply module 100 and the voltage stabilizing resistor 870 form a loop through the third switch tube 860. The voltage at one end of the voltage stabilizing resistor 870 connected to the second enable end 843 of the second switch tube 840 is low, and the voltage received by the second enable end 843 is low. The second switch tube 840 is on, and the charging module 800 is on. When the control module 400 does not send an electrical signal to the third enable end 863 of the third switch tube 860, the third switch tube 860 is off, and the first power supply module 100 and the voltage stabilizing resistor 870 do not form a loop. The voltage at one end of the voltage stabilizing resistor 870 connected to the second enable end 843 of the second switch tube 840 is the voltage of the first power supply module 100, and correspondingly, the voltage received by the second enable end 843 is the voltage of the first power supply module 100, which is high. The second switch tube 840 is off, and the charging module 800 is off.

[0087] In the embodiment, the voltage stabilizing resistor 870 is configured to apply an electrical signal to the second enable terminal 843, and the on-off of the third switch tube 860 is configured to adjust the magnitude of the electrical signal applied to the second enable terminal 843 by the voltage stabilizing resistor 870, so as to control the on-off of the second switch tube 840 through the third switch tube 860. In addition, the voltage stabilizing resistor 870 is configured to enable the second enable terminal 843 to continuously receive the electrical signal, thereby facilitating to ensure the on-off reliability of the second switch tube 840, and further facilitating to improve the reliability of the charging module 800 and the power supply circuit.

[0088] The above embodiment illustrates the periodic conduction of the charging module 800, and the other components of the charging module 800 are described in detail as follows, so as to achieve the charging protection of the charging module 800.

[0089] In some embodiments, the charging module 800 further includes a fourth switch tube 880, and the fourth switch tube 880 is connected in parallel with the voltage stabilizing resistor 870. The fourth switch tube 880 includes a fourth enable terminal 881, and the fourth enable terminal 881 is connected to one end of the charging resistor 850 away from the charging input terminal 810.

[0090] Specifically, the fourth switch tube 880 includes a fourth input terminal 882, a fourth output terminal 883 and the fourth enable terminal 881. The fourth switch tube 880 is connected in parallel with the voltage stabilizing resistor 870, that is, the fourth input terminal 882 is connected to one end of the charging resistor 850 close to the charging input terminal 810, the fourth output terminal 883 is connected to the second enable terminal 843, and the fourth enable terminal 881 is connected to one end of the charging resistor 850 away from the charging input terminal 810. The on-off of the fourth switch tube 880 is related to the voltage difference between the fourth input terminal 882 and the fourth enable terminal 881, that is, related to the voltage of the charging resistor 850.

[0091] When the charging module 800 is conducting, the first power supply module 100 charges the second power supply module 200, and if a short circuit fault occurs during the charging process, the current of the charging resistor 850 and the second switch tube 840 increases, and the voltage of the charging resistor 850 also increases. The fourth switch tube 880 can monitor the voltage of the charging resistor 850, and when the voltage of the charging resistor 850 increases to a certain value, the fourth switch tube 880 is turned on, the fourth switch tube 880 shorts the voltage stabilizing resistor 870, and the first power supply module 100 directly applies an electrical signal to the second enable end 843 of the second switch tube 840 through the fourth switch tube 880, so that the second switch tube 840 is turned off, the charging is stopped, and the protection of the charging module 800, the first power supply module 100 and the second power supply module 200 is realized, and the occurrence of a charging accident is avoided.

[0092] It should be noted that, in order to avoid the current of the loop formed by the first power supply module 100, the fourth switch tube 880 and the third switch tube 860 being too large when the fourth switch tube 880 is turned on, causing an accident, and not affecting the normal work of the fourth switch tube 880 and the voltage stabilizing resistor 870, a protection resistor can be arranged between the second enable end 843 and the third input end 861. The resistance value of the protection resistor is determined based on the electrical signal of the one end of the voltage stabilizing resistor 870 connected to the second enable end 843 not affecting the turn-on of the second switch tube 840 when the first power supply module 100, the voltage stabilizing resistor 870, the protection resistor and the third switch tube 860 form a loop.

[0093] In addition, a diode is arranged between the second output end 842 of the second switch tube 840 and the second power supply module 200, so as to avoid the charging of the first power supply module 100 by the second power supply module 200.

[0094] In the embodiment, the fourth switch tube 880 monitors the condition of the charging module 800 when the charging module 800 is conducting through the charging resistor 850, so as to send an electrical signal to the second enable end 843 of the second switch tube 840 when a short circuit fault occurs in the charging process of the charging module 800, so that the second switch tube 840 is turned off, and the protection of the charging module 800, the first power supply module 100 and the second power supply module 200 is realized, which is beneficial to improving the reliability of the power supply circuit.

[0095] Based on the same inventive concept, the application also provides a vehicle-mounted wireless terminal comprising the power supply circuit. The vehicle-mounted wireless terminal has the same beneficial effects as the power supply circuit, and details are not repeated here.

[0096] Based on the same inventive concept, the application further provides a vehicle comprising the vehicle-mounted wireless terminal.

[0097] It should be understood by those of ordinary skill in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest the scope (including claims) of the application is limited to these examples; the above embodiments or technical features among different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the application as described above, which are not provided in details for the sake of brevity.

[0098] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any one of the steps of the application can be performed in any order, and / or in any combination with other steps from other methods steps, and the scope of the application should not be limited by any illustrated examples.

Claims

1. A power supply circuit, characterized by comprising: The power supply device comprises a first power supply module, a second power supply module, an output module, a control module, a monitoring module and a feedback module. The first power supply module and the second power supply module are connected with the output module, and the control module is connected with the enable terminals of the first power supply module and the second power supply module. The monitoring module comprises a monitoring node for monitoring the electrical signal of the first power supply module, and the feedback module is connected with the monitoring node and the control module. When the electrical signal of the monitoring node is abnormal, the electrical signal of the monitoring node enables the feedback module to output a power supply abnormal signal, and the control module disables the first power supply module and enables the second power supply module after receiving the power supply abnormal signal.

2. The power supply circuit of claim 1, wherein, The power supply device further comprises a reference power supply, the feedback module comprises a feedback input terminal, a feedback output terminal and a feedback enable terminal, the feedback enable terminal is connected with the monitoring node, the feedback input terminal is connected with the reference power supply, and the feedback output terminal is connected with the control module. When the electrical signal of the monitoring node is abnormal, the reference power supply, the feedback input terminal and the feedback output terminal are turned on, and the feedback output terminal outputs a power supply abnormal signal to the control module.

3. The power supply circuit of claim 1, wherein, The monitoring module comprises a first switch tube, the first switch tube comprises a first input terminal and a first output terminal, the first input terminal is connected with the first power supply module, and the first output terminal is connected with the monitoring node.

4. The power supply circuit according to claim 3, characterized in that, The monitoring module further comprises a first resistor and a second resistor, the first resistor, the first switch tube and the second resistor are connected in sequence, the first resistor is connected with the first power supply module, and the second resistor is grounded. The monitoring node is located between the first switch tube and the second resistor.

5. The power supply circuit of claim 3, wherein, The first switch tube is a triode, wherein the emitter of the triode is the first input terminal, and the base of the triode is the first output terminal.

6. The power supply circuit of claim 1, wherein, The power supply device further comprises a charging module, the charging module comprises a charging input terminal, a charging output terminal and a charging enable terminal, the charging input terminal is connected with the first power supply module, the charging output terminal is connected with the second power supply module, the charging enable terminal is connected with the control module, and the control module periodically sends an enable signal to the charging enable terminal. When the control module sends an enable signal to the charging enable terminal, the charging module is turned on, and the first power supply module charges the second power supply module.

7. The power supply circuit of claim 6, wherein, The charging module comprises a second switch tube, a charging resistor, a third switch tube and a voltage stabilizing resistor, the second switch tube comprises a second input terminal, a second output terminal and a second enable terminal, and the third switch tube comprises a third input terminal, a third output terminal and a third enable terminal. One end of the charging resistor is connected with the charging input terminal, the other end of the charging resistor is connected with the second input terminal, the second output terminal is connected with the charging output terminal, one end of the voltage stabilizing resistor close to the charging input terminal of the charging resistor is connected, the other end of the voltage stabilizing resistor is connected with the second enable terminal, the second enable terminal is connected with the third input terminal, the third output terminal is grounded, and the third enable terminal is connected with the charging enable terminal.

8. The power supply circuit of claim 7, wherein, The charging module further comprises a fourth switch tube connected in parallel with the voltage stabilizing resistor, the fourth switch tube comprising a fourth enable terminal connected with one end of the charging resistor away from the charging input terminal.

9. A vehicle-mounted wireless terminal, characterized by comprising: The power supply circuit comprises the charging circuit according to any one of claims 1-8.

10. A vehicle characterized by comprising: The vehicle-mounted wireless terminal comprises the charging circuit according to claim 9.

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