Power supply system and ETC vehicle-mounted unit

Abstract

The utility model discloses a power supply system and an ETC vehicle-mounted unit. The power supply system comprises an interface module, an insertion detection module, a control module, a voltage regulation module and a power supply module. The interface module is used for accessing an input voltage; the insertion detection module is connected with the interface module, and the insertion detection module is used for generating and outputting an insertion detection signal under the condition that the interface module is connected with an external power supply; the control module is used for outputting a first conduction control signal when receiving the insertion detection signal; the voltage regulating module is used for generating and outputting a first charging voltage based on the input voltage after receiving the first conduction control signal; the first charging voltage is used for charging the power supply module. When the control module has faults such as dead halt and stops outputting the first conduction control signal, the voltage regulating module cannot perform voltage conversion and stops outputting the first charging voltage, so that the dead halt prevention function is realized, and the overcharge condition is avoided.

Description

Technical Field

[0001] The present application belongs to the field of ETC technology, and in particular relates to a power supply system and an ETC vehicle-mounted unit. Background Art

[0002] At present, with the increasing popularity of Electronic Toll Collection (ETC) technology, ETC is being used in more and more scenarios. As an important part of the ETC system, the on-board unit (OBU) is being used more and more frequently, and the demand for battery power of OBU is also increasing.

[0003] If OBU relies solely on solar power supply, it may not be able to meet high-frequency consumption. Utility Model Content

[0004] The purpose of this application is to provide a power supply system and an ETC vehicle-mounted unit, aiming to solve the problem that traditional vehicle-mounted units cannot meet high-frequency usage.

[0005] A first aspect of an embodiment of the present application provides a power supply system, comprising: an interface module, the interface module being used to connect to an external power supply to access an input voltage provided by the external power supply; an insertion detection module, the insertion detection module being connected to the interface module, the insertion detection module being used to generate and output an insertion detection signal when the interface module is connected to the external power supply; a control module, the control module being connected to the insertion detection module, the control module being used to output a first conduction control signal upon receiving the insertion detection signal; a voltage regulating module, the voltage regulating module being connected to the interface module and the control module, the voltage regulating module being used to generate and output a first charging voltage based on the input voltage upon receiving the first conduction control signal; and a power supply module, the power supply module being connected to the voltage regulating module, the first charging voltage being used to charge the power supply module.

[0006] In one embodiment, the control module includes a main control unit and an identification unit; the main control unit is connected to the insertion detection module, and the identification unit is respectively connected to the main control unit and the voltage regulation module; the main control unit is used to generate and output a second conduction control signal when receiving the insertion detection signal, and the identification unit is used to identify the second conduction control signal, and generate and output the first conduction control signal when receiving the second conduction control signal, wherein the second conduction control signal is a PWM wave signal.

[0007] In one embodiment, the identification unit includes a first capacitor, a second capacitor, a first resistor, a second resistor, a first diode, a second diode and a first switch tube; the first end of the first capacitor is connected to the interface module, the second end of the first capacitor is respectively connected to the positive electrode of the first diode and the negative electrode of the second diode, the negative electrode of the first diode is respectively connected to the first end of the second capacitor and the first end of the first resistor, the second end of the second capacitor and the positive electrode of the second diode are both grounded, the second end of the first resistor is respectively connected to the first end of the second resistor and the controlled end of the first switch tube, the second end of the second resistor is grounded, the first end of the first switch tube is connected to the voltage regulation module, and the second end of the first switch tube is grounded.

[0008] In one embodiment, the power module includes an energy storage unit and a charge and discharge control unit; the energy storage unit and the charge and discharge control unit are both connected to the voltage regulation module, the charge and discharge control unit is connected to the energy storage unit, the energy storage unit is used to be connected to a load, and the charge and discharge control unit is used to control the charge and discharge of the energy storage unit.

[0009] In one embodiment, the power module also includes a solar power generation unit, which is respectively connected to the energy storage unit and the charge and discharge control unit, and the solar power generation unit is used to generate a second charging voltage based on light, and the second charging voltage is used to charge the energy storage unit under the control of the charge and discharge control unit.

[0010] In one embodiment, the voltage regulating module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a third diode, a fourth diode and a second switch tube; the first end of the third resistor, the first end of the third capacitor and the positive electrode of the third diode are all connected to the interface module, the second end of the third resistor and the second end of the third capacitor are both grounded, the negative electrode of the third diode is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor, the first end of the sixth resistor and the first end of the second switch tube, the second end of the fourth resistor is respectively connected to the control module and the first end of the seventh resistor, the second end of the seventh resistor is respectively connected to the second end of the fifth resistor and the controlled end of the second switch tube, the second end of the second switch tube is respectively connected to the second end of the sixth resistor, the positive electrode of the fourth diode and the charge and discharge control unit, and the negative electrode of the fourth diode is connected to the energy storage unit.

[0011] In one embodiment, the interface module includes a Type-C interface, and the insertion detection module and the voltage regulation module are respectively connected to corresponding pins of the Type-C interface.

[0012] In one embodiment, the interface module also includes a fast charging protocol unit, which is connected to a corresponding pin of the Type-C interface, and the fast charging protocol unit is used to control the input voltage transmitted by the Type-C interface to the voltage regulating module.

[0013] In one embodiment, the first charging voltage is lower than the input voltage.

[0014] A second aspect of an embodiment of the present application provides an ETC vehicle-mounted unit, comprising a vehicle-mounted unit main body and a power supply system as described above, wherein the power supply system is connected to the vehicle-mounted unit main body to provide a working voltage to the vehicle-mounted unit main body.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the insertion detection module can detect whether an external power supply is connected to the interface module. When an external power supply is connected to the interface module and provides input voltage, the control module can control the operation of the voltage regulation module according to the insertion detection signal.

[0016] When the control module crashes and stops outputting the first conduction control signal, the voltage regulating module cannot convert the voltage and stops outputting the first charging voltage, thereby realizing the anti-crash function and avoiding overcharging caused by the control module failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a power supply system provided in one embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of a control module provided in one embodiment of the present application;

[0019] Figure 3 A circuit diagram of an identification unit provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the structure of a power module provided in one embodiment of the present application;

[0021] Figure 5 A circuit diagram of a voltage regulating module provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of an interface module provided in one embodiment of the present application;

[0023] Figure 7 A circuit diagram of an insertion detection module provided in an embodiment of the present application;

[0024] Figure 8A schematic diagram of the structure of an ETC vehicle-mounted unit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Figure 1 A schematic diagram of the structure of a power supply system provided in an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0028] The power supply system 10 includes: an interface module 100 , an insertion detection module 200 , a control module 300 , a voltage regulation module 400 and a power supply module 500 .

[0029] The interface module 100 is used to connect to the external power supply 20 to access the input voltage provided by the external power supply 20. It is understandable that the external power supply 20 can be docked with the interface module 100 through a corresponding plug. The insertion detection module 200 is connected to the interface module 100, and the insertion detection module 200 is used to generate and output an insertion detection signal when the interface module 100 is connected to the external power supply 20. The control module 300 is connected to the insertion detection module 200, and the control module 300 is used to output a first conduction control signal when the insertion detection signal is received. The voltage regulation module 400 is connected to the interface module 100 and the control module 300, and the voltage regulation module 400 is used to generate and output a first charging voltage based on the input voltage when the first conduction control signal is received. The power module 500 is connected to the voltage regulation module 400, and the first charging voltage is used to charge the power module 500.

[0030] The insertion detection module 200 detects whether an external power supply 20 is inserted into the interface module 100. When the external power supply 20 is connected to the interface module 100 and provides an input voltage, the insertion detection module 200 will output a corresponding insertion detection signal. The control module 300 can control the operation of the voltage regulation module 400 according to the insertion detection signal, which helps the power supply system 10 to work normally and avoids the power supply system 10 from charging under abnormal conditions.

[0031] When the control module 300 crashes and stops outputting the first conduction control signal, the voltage regulating module 400 cannot convert the voltage and stops outputting the first charging voltage, thereby realizing the anti-crash function and avoiding overcharging.

[0032] In one embodiment, if Figure 2 As shown, the control module 300 includes a main control unit 310 and an identification unit 320. The main control unit 310 is connected to the insertion detection module 200, and the identification unit 320 is respectively connected to the main control unit 310 and the voltage regulation module 400; the main control unit 310 is used to generate and output a second conduction control signal when receiving an insertion detection signal, and the identification unit 320 is used to identify the second conduction control signal, and generate and output a first conduction control signal when receiving the second conduction control signal. The second conduction control signal is a PWM wave signal. The main control unit 310 may include a microcontroller such as a chip or a single-chip microcomputer.

[0033] It should be noted that the main control unit 310 can output the second conduction control signal under normal working conditions. When the main control unit 310 freezes or encounters a fault such as a system crash, the main control unit 310 can only output a high level or a low level. The identification unit 320 cannot identify the signal output by the main control unit 310, and stops outputting the first conduction control signal, causing the voltage regulating module 400 to stop working, thereby preventing the voltage regulating module 400 from continuing to work when the main control unit 310 fails.

[0034] In one embodiment, if Figure 3 As shown, the identification unit 320 includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2 and a first switch tube Q1. The first end of the first capacitor C1 is connected to the interface module 100, the second end of the first capacitor C1 is respectively connected to the positive electrode of the first diode D1 and the negative electrode of the second diode D2, the negative electrode of the first diode D1 is respectively connected to the first end of the second capacitor C2 and the first end of the first resistor R1, the second end of the second capacitor C2 and the positive electrode of the second diode D2 are both grounded, the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2 and the controlled end of the first switch tube Q1, the second end of the second resistor R2 is grounded, the first end of the first switch tube Q1 is connected to the voltage regulating module 400, and the second end of the first switch tube Q1 is grounded. In some embodiments, the first switch tube Q1 is an NPN transistor.

[0035] It can be understood that, since the second conduction control signal is a PWM wave signal, the second conduction control signal can charge the second capacitor C2 through the first capacitor C1 to generate a certain voltage at the first end of the second capacitor C2, so that the first switch tube Q1 is turned on. When the first switch tube Q1 is turned on, the identification unit 320 outputs the first conduction control signal.

[0036] In one embodiment, if Figure 4 As shown, the power module 500 includes an energy storage unit 520 and a charge and discharge control unit 510. The energy storage unit 520 and the charge and discharge control unit 510 are both connected to the voltage regulation module 400, the charge and discharge control unit 510 is connected to the energy storage unit 520, the energy storage unit 520 is used to be connected to the load, and the charge and discharge control unit 510 is used to control the charge and discharge of the energy storage unit 520. In some embodiments, the energy storage unit 520 includes a battery, and the charge and discharge control unit 510 includes a battery management system (BATTERY MANAGEMENT SYSTEM; BMS).

[0037] It is understandable that the charge and discharge control unit 510 can control the charge and discharge of the energy storage unit 520 based on the first charging voltage provided by the voltage regulation module 400 .

[0038] In one embodiment, if Figure 4 As shown, the power module 500 also includes a solar power generation unit 530, which is respectively connected to the energy storage unit 520 and the charge and discharge control unit 510, and the solar power generation unit 530 is used to generate a second charging voltage based on light, and the second charging voltage is used to charge the energy storage unit 520 under the control of the charge and discharge control unit 510.

[0039] When there is sufficient sunlight in the environment, the solar power generation unit 530 can generate a second charging voltage to charge the energy storage unit 520 .

[0040] In one embodiment, if Figure 5 As shown, the voltage regulating module 400 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a third diode D3, a fourth diode D4 and a second switch tube Q2.

[0041] The first end of the third resistor R3, the first end of the third capacitor C3, and the anode of the third diode D3 are all connected to the interface module 100, the second end of the third resistor R3 and the second end of the third capacitor C3 are all grounded, the cathode of the third diode D3 is respectively connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, the first end of the sixth resistor R6, and the first end of the second switch tube Q2, the second end of the fourth resistor R4 is respectively connected to the control module 300 and the first end of the seventh resistor R7, the second end of the seventh resistor R7 is respectively connected to the second end of the fifth resistor R5 and the controlled end of the second switch tube Q2, the second end of the second switch tube Q2 is respectively connected to the second end of the sixth resistor R6, the anode of the fourth diode D4, and the charge and discharge control unit 510, and the cathode of the fourth diode D4 is connected to the energy storage unit 520. In some embodiments, the second switch tube Q2 is a PNP transistor.

[0042] It should be noted that, when the identification unit 320 outputs the first conduction control signal, the second switch tube Q2 is turned on to generate a first charging voltage at the positive electrode of the fourth diode D4 and the negative electrode of the fourth diode D4. The first charging voltage is used to drive the charge and discharge control unit 510 to work and to charge the energy storage unit 520. The fourth diode D4 is used to prevent the voltage of the energy storage unit 520 from affecting the operation of the charge and discharge control unit 510.

[0043] In some embodiments, the voltage value of the input voltage is 5V, and the voltage value of the first charging voltage is 3.3V.

[0044] In one embodiment, if Figure 6 As shown, the interface module 100 includes a Type-C interface 110 , and the insertion detection module 200 and the voltage regulation module 400 are respectively connected to corresponding pins of the Type-C interface 110 .

[0045] In some embodiments, the insertion detection module 200 and the voltage regulation module 400 may also be connected to the same pin of the Type-C interface 110 . For example, the insertion detection module 200 and the voltage regulation module 400 may be connected to the VBUS pin of the Type-C interface 110 .

[0046] In one embodiment, if Figure 6 As shown, the interface module 100 also includes a fast charging protocol unit 120, which is connected to the corresponding pins of the Type-C interface 110, and the fast charging protocol unit 120 is used to control the input voltage transmitted by the Type-C interface 110 to the voltage regulating module 400. Among them, the fast charging protocol unit 120 includes a PD protocol power receiving end chip and its peripheral circuits, and the PD protocol power receiving end chip is respectively connected to the VBUS pin, CC1 pin, CC2 pin, DP pin, and DM pin of the Type-C interface 110.

[0047] The fast charging protocol unit 120 is used to control the voltage of the VBUS pin of the Type-C interface 110 .

[0048] In one embodiment, the first charging voltage is lower than the input voltage.

[0049] The voltage regulating module 400 may include a step-down unit for stepping down the input voltage to obtain the first charging voltage, wherein the step-down unit specifically includes a low dropout linear regulator (LDO) and related circuits.

[0050] It can be understood that the size of the first charging voltage and the structure of the voltage regulating module 400 can be set according to actual conditions and requirements. In some embodiments, the first charging voltage is greater than the input voltage, and the voltage regulating module 400 includes a boost unit for boosting the input voltage to obtain the first charging voltage.

[0051] In one embodiment, if Figure 7 As shown, the insertion detection module 200 includes an eighth resistor R8 and a ninth resistor R9, the first end of the eighth resistor R8 and the first end of the ninth resistor R9 are both connected to the VBUS pin of the Type-C interface 110, the second end of the eighth resistor R8 is grounded, and the second end of the ninth resistor R9 is connected to the control module 300. The input voltage is divided by the eighth resistor R8 and the ninth resistor R9, and when there is an input voltage, the insertion detection module 200 provides a level to the control module 300, that is, provides an insertion detection signal.

[0052] Figure 8 The structure diagram of the ETC vehicle-mounted unit provided in one embodiment of the present application is shown. For the convenience of explanation, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0053] An ETC vehicle-mounted unit 30 includes a vehicle-mounted unit body 40 and a power supply system 10 as in any of the above embodiments, wherein the power supply system 10 is connected to the vehicle-mounted unit body 40 to provide a working voltage to the vehicle-mounted unit body 40 .

[0054] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply system, characterized in that: include: An interface module, the interface module is used to connect to an external power supply to access an input voltage provided by the external power supply; an insertion detection module, the insertion detection module being connected to the interface module, and the insertion detection module being used to generate and output an insertion detection signal when the interface module is connected to the external power supply; A control module, the control module is connected to the insertion detection module, and the control module is used to output a first conduction control signal when receiving the insertion detection signal; a voltage regulating module, the voltage regulating module being connected to the interface module and the control module, and the voltage regulating module being configured to generate and output a first charging voltage based on the input voltage when receiving the first conduction control signal; A power supply module is connected to the voltage regulating module, and the first charging voltage is used to charge the power supply module.

2. The power supply system according to claim 1, characterized in that: The control module includes a main control unit and an identification unit; The main control unit is connected to the insertion detection module, and the identification unit is connected to the main control unit and the voltage regulation module respectively; The main control unit is used to generate and output a second conduction control signal when the insertion detection signal is received, and the identification unit is used to identify the second conduction control signal and generate and output the first conduction control signal when the second conduction control signal is received, wherein the second conduction control signal is a PWM wave signal.

3. The power supply system according to claim 2, characterized in that: The identification unit includes a first capacitor, a second capacitor, a first resistor, a second resistor, a first diode, a second diode and a first switch tube; The first end of the first capacitor is connected to the interface module, the second end of the first capacitor is respectively connected to the anode of the first diode and the cathode of the second diode, the cathode of the first diode is respectively connected to the first end of the second capacitor and the first end of the first resistor, the second end of the second capacitor and the anode of the second diode are both grounded, the second end of the first resistor is respectively connected to the first end of the second resistor and the controlled end of the first switch tube, the second end of the second resistor is grounded, the first end of the first switch tube is connected to the voltage regulation module, and the second end of the first switch tube is grounded.

4. The power supply system according to any one of claims 1 to 3, characterized in that: The power module includes an energy storage unit and a charge and discharge control unit; The energy storage unit and the charge and discharge control unit are both connected to the voltage regulating module, the charge and discharge control unit is connected to the energy storage unit, the energy storage unit is used to be connected to a load, and the charge and discharge control unit is used to control the charge and discharge of the energy storage unit.

5. The power supply system according to claim 4, characterized in that: The power module also includes a solar power generation unit, which is connected to the energy storage unit and the charge and discharge control unit respectively. The solar power generation unit is used to generate a second charging voltage based on light, and the second charging voltage is used to charge the energy storage unit under the control of the charge and discharge control unit.

6. The power supply system according to claim 4, characterized in that: The voltage regulating module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a third diode, a fourth diode and a second switch tube; The first end of the third resistor, the first end of the third capacitor and the positive electrode of the third diode are all connected to the interface module, the second end of the third resistor and the second end of the third capacitor are both grounded, the cathode of the third diode is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor, the first end of the sixth resistor and the first end of the second switch tube, the second end of the fourth resistor is respectively connected to the control module and the first end of the seventh resistor, the second end of the seventh resistor is respectively connected to the second end of the fifth resistor and the controlled end of the second switch tube, the second end of the second switch tube is respectively connected to the second end of the sixth resistor, the positive electrode of the fourth diode and the charge and discharge control unit, and the cathode of the fourth diode is connected to the energy storage unit.

7. The power supply system according to any one of claims 1 to 3, characterized in that: The interface module includes a Type-C interface, and the insertion detection module and the voltage regulation module are respectively connected to corresponding pins of the Type-C interface.

8. The power supply system according to claim 7, characterized in that: The interface module also includes a fast charging protocol unit, which is connected to the corresponding pin of the Type-C interface, and the fast charging protocol unit is used to control the input voltage transmitted by the Type-C interface to the voltage regulating module.

9. The power supply system according to any one of claims 1 to 3, characterized in that: The first charging voltage is lower than the input voltage.

10. An ETC vehicle-mounted unit, characterized in that: It comprises a vehicle-mounted unit main body and a power supply system as claimed in any one of claims 1 to 9, wherein the power supply system is connected to the vehicle-mounted unit main body to provide a working voltage to the vehicle-mounted unit main body.

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