Charging circuit and terminal

Abstract

The invention relates to a charging circuit and a terminal, the charging circuit comprises a first input loop, a second input loop, a control module and an input branch circuit, the input branch circuit is connected between a power supply node and the second input loop, the input branch circuit comprises a second capacitor and a first rectification unit, the second capacitor is used for providing voltage for the power supply node, the first rectifying unit is arranged between the second capacitor and the power supply node, and the first rectifying unit is used for cutting off an electric signal from the first input loop to the second capacitor. According to the invention, the voltage from the input port of the first input loop directly charges the first capacitor of the first input loop, the starting delay time of the control module is reduced, the power-on speed of the charger is improved, the user experience is improved, and the risk of misjudging the fault of the charging equipment is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of terminal technology, and in particular to a charging circuit and a terminal. Background Art

[0002] With the continuous development of society, electronic devices have become indispensable items in people's daily lives. Due to the popularity of electronic devices such as mobile phones and tablets, users' requirements for charger performance are also increasing. However, the current chargers have the problem of long startup delay, which will affect the user experience. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a charging circuit and a terminal.

[0004] According to a first aspect of an embodiment of the present disclosure, a charging circuit is provided, comprising: a first input loop, comprising a power supply node and a first capacitor, one end of the first capacitor being connected to the power supply node, a second input loop, a control module, connected between the power supply node and the second input loop, for controlling an electrical signal output by the charging circuit, the first capacitor providing a voltage to the power supply node, and an input branch, connected between the power supply node and the second input loop, the input branch comprising a second capacitor and a first rectifier unit, wherein the input branch provides a voltage to the power supply node with the second capacitor, the first rectifier unit is arranged between the second capacitor and the power supply node, and the first rectifier unit is used to cut off the electrical signal from the first input loop to the second capacitor.

[0005] In some embodiments, the capacity of the second capacitor is greater than the capacity of the first capacitor.

[0006] In some embodiments, the first input loop is a high-voltage side input loop of a transformer, and the second input loop is an auxiliary winding side input loop of the transformer.

[0007] In some embodiments, the first input circuit and the second input circuit are both continuous power supply circuits.

[0008] In some embodiments, the input branch further includes: a second rectifying unit connected between the second input loop and the second capacitor, and the second rectifying unit is used to cut off the electrical signal from the second capacitor to the second input loop.

[0009] In some embodiments, the input branch also includes: a voltage stabilization node, one end of the second capacitor is connected to the voltage stabilization node, and the other end is grounded; a protection branch, one end is connected to the second input loop, and the other end is connected to the voltage stabilization node, and the protection branch is used to prevent the second input loop from overvoltage.

[0010] In some embodiments, the protection branch includes: a first resistor and a third capacitor connected in series, one end of the first resistor is connected to the second input loop, and one end of the third capacitor is connected between the second rectifier unit and the second capacitor.

[0011] In some embodiments, the first rectifying unit includes a diode, and / or the second rectifying unit includes a diode.

[0012] In some embodiments, the input branch further includes: a current limiting unit, which is arranged between the protection branch and the second capacitor, and the current limiting unit is used to reduce the size of the electrical signal from the second input loop to the second capacitor.

[0013] In some embodiments, the current limiting unit includes a second resistor.

[0014] In some embodiments, the first input loop further includes: a third resistor and a fourth resistor arranged in series, one end of the third resistor is connected to the high voltage side of the transformer, and one end of the fourth resistor is connected to the first rectifier unit.

[0015] According to a second aspect of the embodiments of the present disclosure, a terminal is further provided, comprising: a charging circuit as described in any one of the above embodiments.

[0016] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0017] By setting a first rectifier unit in the input branch of the charging circuit, the first rectifier unit cuts off the electrical signal from the first input loop of the charging circuit to the second capacitor of the input branch. In this way, the voltage from the input port of the first input loop directly charges the first capacitor of the first input loop, thereby reducing the startup delay time of the control module, increasing the power-on speed of the charger, and further improving the user experience, avoiding the risk of misjudging the fault of the charging device.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] Figure 1 is a block diagram of a charging circuit according to an exemplary embodiment.

[0021] Figure 2 is a block diagram of a charging circuit according to another exemplary embodiment.

[0022] Figure 3 is a block diagram of a charging circuit according to an exemplary embodiment.

[0023] Figure 4 is a schematic diagram of a charging circuit according to an exemplary embodiment.

[0024] Figure 5 It is a schematic diagram of the power-on start-up time test results of the charging circuit in the related art.

[0025] Figure 6 The figure is a schematic diagram of a startup time test result of a charging circuit according to an exemplary embodiment.

[0026] Reference numerals:

[0027] 100. Charging circuit;

[0028] 1. First input loop; 11. Power supply node; 12. First capacitor; 13. Third resistor; 14. Fourth resistor;

[0029] 2. Second input circuit; 21. Detection branch; 211. Fifth resistor; 212. Fourth capacitor; 213. Sixth resistor; 22. Fifth capacitor;

[0030] 3. Control module;

[0031] 4. Input branch; 41. Second capacitor; 42. First rectifier unit; 43. Second rectifier unit; 44. Voltage stabilization node; 45. Protection branch; 451. First resistor; 452. Third capacitor; 46. Current limiting unit; DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0033] In the related art, in the charger startup circuit solution, a low-voltage or high-voltage startup circuit is usually used to start the control module. Compared with the low-voltage startup circuit, the high-voltage startup circuit reduces the use of low-dropout linear regulator (LDO), thereby reducing the manufacturing cost.

[0034] However, since the charger has electromagnetic compatibility and safety testing (EMI safety testing) requirements, the high-voltage startup circuit needs to add an electrolytic capacitor in its soft-start branch to meet the requirements. Moreover, during high-voltage startup, the voltage input from the high-voltage side will charge the electrolytic capacitor. Only when the charge of the electrolytic capacitor accumulates to a certain level will the capacitor at the input end of the control module accumulate charge, resulting in a long delay in the startup time of the control module. This delay will affect the user experience and lead to misjudgment of charging equipment failure, which in turn causes unnecessary after-sales problems.

[0035] In order to solve the above technical problem, a charging circuit 100 is provided according to an embodiment of the present disclosure.

[0036] Figure 1 is a block diagram of a charging circuit according to an exemplary embodiment.

[0037] In some embodiments, Figure 1 As shown, the charging circuit 100 mainly includes a first input loop 1 , a second input loop 2 , a control module 3 and an input branch 4 .

[0038] like Figure 1 As shown, the first input loop 1 includes a power supply node 11 and a first capacitor 12, one end of the first capacitor 12 is connected to the power supply node 11, the control module 3 is connected between the power supply node 11 and the second input loop 2, the first capacitor 12 provides voltage to the power supply node 11, the input branch 4 is connected between the power supply node 11 and the second input loop 2, the input branch 4 includes a second capacitor 41 and a first rectifier unit 42, the second capacitor 41 provides voltage to the power supply node 11, the first rectifier unit 42 is arranged between the second capacitor 41 and the power supply node 11, and the first rectifier unit 42 is used to cut off the electrical signal from the first input loop 1 to the second capacitor 41.

[0039] It is worth noting that the input end of the first input loop 1 and the input end of the second input loop 2 are both connected to the input end of the control module 3 , so that the first input loop 1 and the second input loop 2 supply power to the control module 3 .

[0040] It is also worth noting that in the charger of the related art, the power node 11 is generally connected to the input power supply, acting as a storage and distribution center for charge. When the charger is started, the charge will flow from the power node to other parts of the circuit to provide the required electrical energy for the device. In the charging circuit 100 of the present disclosure, the first capacitor 12 provides a voltage to the power node 11 in order to provide a power supply voltage or charge storage to the charging circuit 100. The first capacitor 12 also plays a certain filtering and voltage stabilization role to reduce the fluctuation and noise interference of the charge in the circuit. Therefore, the first capacitor 12 needs to provide a voltage to the power node 11 to ensure the flow and stability of the charge in the charging circuit 100. Through the control module 3, the output electrical signal of the charging circuit 100 can be controlled to achieve control of the charging circuit 100.

[0041] Among them, the first rectifier unit 42 is used to cut off the electrical signal from the first input loop 1 to the second capacitor 41, that is, the first rectifier unit 42 can realize reverse current cutoff, therefore, the first rectifier unit 42 can be realized by electrical components such as diodes or field effect transistors. However, the present disclosure does not specifically limit the type of the first rectifier unit 42, that is, those skilled in the art can adjust its type according to actual conditions. As long as the first rectifier unit 42 can realize reverse current cutoff, it can be used.

[0042] In some embodiments, the first input loop 1 may be a high-voltage side input loop of a transformer, and the second input loop 2 may be an auxiliary winding side input loop of the transformer.

[0043] It is worth noting that the time when the electrical signal enters the input end of the first input loop 1 is earlier than the time when the electrical signal enters the input end of the second input loop 2. By separating the first input loop 1 on the high-voltage side from the second input loop 2 on the auxiliary winding side, the degree of harm to users and equipment when the charging circuit 100 fails or encounters an unexpected situation can be effectively reduced, and the safety of the entire circuit system can be ensured. And the transformer auxiliary winding as the second input loop 2 can make the output of the charging circuit 100 more stable and the ripple smaller, and at the same time can also improve the power factor and efficiency of the charging circuit 100, and optimize the performance and reliability of the circuit.

[0044] It is worth noting that in the related art, when the high voltage is started, the input end of the first input circuit will divide the voltage to charge the electrolytic capacitor and the first capacitor of the soft start branch, but because the capacity of the electrolytic capacitor is greater than the capacity of the first capacitor, the first input circuit will divide most of the voltage to charge the electrolytic capacitor, and the first capacitor only obtains a small part of the voltage, and the first capacitor consumes part of the energy to power the control module. When the point voltage of the first capacitor is lower than the working voltage of the control module, the control module will fail to start. After the voltage at the input end of the second input circuit enters, the electrolytic capacitor will be charged first. After the electrolytic capacitor is full, the electrolytic capacitor and the input end of the first input circuit simultaneously power the first capacitor. When the accumulated charge of the first capacitor meets the starting threshold voltage of the control module, the control module starts to work, that is, the starting time of the control module is the sum of the charging time of the electrolytic capacitor of the soft start branch and the charging time of the first capacitor.

[0045] In the present disclosure, due to the existence of the first rectifier unit 42, since the first rectifier unit 42 has a reverse cutoff function, the first input loop 1 will not divide the voltage to charge the second capacitor 41, and directly charge the first capacitor 12. After the voltage of the second input loop 2 enters, it charges the second capacitor 41, and the charging speed of the second capacitor 41 has no effect on the starting speed of the control module 3. That is, the starting time of the control module 3 is the charging time of the first capacitor 12.

[0046] In the above embodiment of the present disclosure, the first rectifier unit 42 cuts off the electrical signal from the first input loop 1 to the second capacitor 41, and only allows the electrical signal from the input branch 4 to pass. In this way, the voltage from the input port of the first input loop 1 directly charges the first capacitor 12 of the first input loop 1. Compared with the relevant charging circuit, the electrical signal of the first input loop 1 of the present disclosure does not need to charge the electrolytic capacitor of the soft start branch, that is, the charging circuit 100 of the present disclosure does not need to wait for the electrolytic capacitor of the soft start branch to be fully charged before charging the first capacitor 12. Thereby, the startup delay time of the control module 3 is shortened, the user experience is improved, and the risk of misjudging the charging device failure is avoided.

[0047] In some embodiments, the capacity of the second capacitor 41 may be greater than the capacity of the first capacitor 12 .

[0048] Among them, the first capacitor 12 can be a non-polar capacitor such as a metallized polypropylene film capacitor, a ceramic capacitor or a polyimide capacitor. The non-polar capacitor has better electrical performance and stability and is suitable for applications in high-frequency environments. However, the present disclosure does not specifically limit the type of the first capacitor 12, that is, those skilled in the art can adjust its type according to actual conditions. For example, taking the first capacitor 12 as a metallized polypropylene film capacitor as an example. As long as the first capacitor 12 is suitable for applications in high-frequency environments, it can be used.

[0049] Among them, the second capacitor 41 can be a polar capacitor such as an aluminum electrolytic capacitor or a tantalum electrolytic capacitor. The polar capacitor can provide a higher capacitance and can smoothly increase the voltage of the second input loop 2 to protect other components in the charging circuit 100 from being affected by excessive voltage. However, the present disclosure does not specifically limit the type of the second capacitor 41, that is, those skilled in the art can adjust its type according to actual conditions, for example, taking the second capacitor 41 as an example of an aluminum electrolytic capacitor. As long as the second capacitor 41 can provide a higher capacitance and can smoothly increase the voltage of the second input loop 2, it can be used.

[0050] In the above embodiment, the second capacitor 41 serves as the capacitor of the input branch 4 of the second input loop 2. By using polarized capacitors to store more charge, the startup requirements of the charging circuit 100 can be met, thereby making the charging circuit 100 start more smoothly and reducing voltage fluctuations during startup.

[0051] In some embodiments, the first input loop 1 and the second input loop 2 may both be continuous power supply loops.

[0052] In the above embodiment, the first input loop 1 and the second input loop 2 continuously supply power, so that the charge accumulation speed of the first capacitor 12 is faster, thereby improving the operating stability of the control module 3.

[0053] Figure 2 is a block diagram of a charging circuit according to another exemplary embodiment. Figure 3 is a block diagram of a charging circuit according to an exemplary embodiment. Figure 4 is a schematic diagram of a charging circuit according to an exemplary embodiment.

[0054] In some embodiments, Figure 2 As shown in Figures 3 or 4 , the input branch 4 may further include a second rectifying unit 43 , which is connected between the second input loop 2 and the second capacitor 41 , and is used to cut off the electrical signal from the second capacitor 41 to the second input loop 2 .

[0055] It is worth noting that the second rectifier unit 43 is used to cut off the electrical signal from the second capacitor 41 to the second input loop 2, that is, the second rectifier unit 43 can realize reverse current cutoff, therefore, the second rectifier unit 43 can be realized by an electrical element such as a diode or a field effect transistor. However, the present disclosure does not specifically limit the type of the second rectifier unit 43, that is, those skilled in the art can adjust its type according to actual conditions. As long as the second rectifier unit 43 can realize reverse current cutoff, it can be used.

[0056] In the above embodiment, the second rectifying unit 43 is used to prevent the current from flowing in reverse. If there is no second rectifying unit 43 to prevent the current from flowing in reverse, the current may flow in reverse when the second capacitor 41 is charged, causing the control module 3 to fail to start normally, affecting the user's experience. By adding the second rectifying unit 43, the current can be effectively prevented from flowing in reverse, ensuring the normal operation of the charging circuit 100 and improving the reliability and stability of the product.

[0057] In some embodiments, Figure 2 As shown in 3 or 4, the input branch 4 can also include a voltage stabilizing node 44 and a protection branch 45. One end of the second capacitor 41 is connected to the voltage stabilizing node 44, and the other end is grounded. One end of the protection branch 45 is connected to the second input loop 2, and the other end is connected to the voltage stabilizing node 44. The protection branch 45 is used to prevent the second input loop 2 from overvoltage.

[0058] In the above embodiment, the protection branch 45 serves to absorb the peak voltage of the second input circuit 2 to prevent the voltage generated by the second input circuit 2 from being greater than the maximum withstand voltage specification of the input end of the control module 3 after the transformer converts the voltage, thereby causing the control module 3 to be broken down by the high voltage.

[0059] Among them, the protection branch 45 can be realized by a combination of a resistor element and a capacitor element or a metal oxide varistor, but the present disclosure does not specifically limit the type of the protection branch 45, that is, technical personnel in this field can adjust its type according to actual conditions, as long as the protection branch 45 can absorb the peak voltage of the second input loop 2.

[0060] In some embodiments, Figure 4 As shown, the protection branch 45 may include: a first resistor 451 and a third capacitor 452 connected in series, one end of the first resistor 451 is connected to the second input loop 2, and one end of the third capacitor 452 is connected between the second rectifier unit 43 and the second capacitor 41.

[0061] In the above embodiment, a low-pass filter can be formed by connecting the first resistor 451 and the third capacitor 452 in series. The function of the first resistor 451 is to limit the current, while the function of the third capacitor 452 is to store charge and produce a phase lag effect on the voltage. When the input signal of the second input loop 2 passes through the first resistor 451 and the third capacitor 452, the high-frequency signal will be filtered out by the first resistor 451 and the third capacitor 452, and only the low-frequency signal can pass through the first resistor 451 and the third capacitor 452, so the signal obtained at the output end of the third capacitor 452 will be a filtered low-frequency signal.

[0062] In some embodiments, Figure 2As shown in 3 or 4, the first rectifying unit 42 may include a diode, and / or the second rectifying unit 43 may include a diode.

[0063] It is worth noting that the first rectifier unit 42 uses a diode to realize reverse current interception, the positive electrode of the first rectifier unit 42 is connected to the voltage stabilization node 44, and the negative electrode of the first rectifier unit 42 is connected to the power supply node 11. In this way, the electrical signal of the first input loop 1 cannot be charged to the second capacitor 41 through the first rectifier unit 42, but the electrical signal of the second input loop 2 can be charged to the first capacitor 12 through the first rectifier unit 42.

[0064] In the above embodiment, the second rectifier unit 43 uses a diode to cut off the reverse current, the positive electrode of the second rectifier unit 43 is connected to the input end of the second input loop 2, and the negative electrode of the second rectifier unit 43 is connected to the second capacitor 41. In this way, the current of the second capacitor 41 will not flow in the reverse direction, ensuring the operation of the control module 3.

[0065] In some embodiments, Figure 3 As shown in FIG. 4 , the input branch 4 may further include a current limiting unit 46 , which is disposed between the protection branch 45 and the second capacitor 41 , and is used to reduce the magnitude of the electrical signal from the second input loop 2 to the second capacitor 41 .

[0066] The current limiting unit 46 may be a resistor or a transient voltage suppression diode, etc., but the present disclosure does not specifically limit the type of the current limiting unit 46, that is, those skilled in the art may adjust the type according to actual conditions. As long as the current limiting unit 46 can reduce the size of the electrical signal from the second input loop 2 to the second capacitor 41, it can be used.

[0067] In the above embodiment, the current limiting unit 46 reduces the magnitude of the electrical signal from the second input loop 2 to the second capacitor 41, thereby preventing excessive current from causing excessive voltage shock to the second capacitor 41, thereby protecting the second capacitor 41 from damage.

[0068] In some embodiments, the current limiting unit 46 includes a second resistor (not shown).

[0069] In the above embodiment, by changing the resistance value of the second resistor, the current limiting value can be adjusted, which can improve the flexibility and controllability of the charging circuit 100. In addition, the cost of using the second resistor is relatively low, and it is also suitable for mass production and application.

[0070] In some embodiments, Figure 4 As shown, the first input loop 1 may further include: a third resistor 13 and a fourth resistor 14 connected in series, one end of the third resistor 13 is connected to the high voltage side of the transformer, and one end of the fourth resistor 14 is connected to the first rectifying unit 42 .

[0071] It is worth noting that the first input loop 1 is a high-voltage side input loop, which charges the first capacitor 12 after voltage division by the third resistor 13 and the fourth resistor 14, so that the carrying voltage of the first capacitor 12 meets the minimum standard for the operation of the control module 3, so that the control module 3 can work normally.

[0072] In some embodiments, the control module 3 may include multiple serial ports, and the connection relationship between the serial ports of the control module 3 is as follows:

[0073] like Figure 4 As shown, the control module 3 may also include a ground terminal (GND), a comparator terminal (COMP), a zero voltage switch terminal (ZCS), a field effect transistor driving terminal (GATE), a power input terminal (VCC) and a current detection terminal (CS).

[0074] Wherein, the ground terminal (GND) can be directly grounded to provide a ground reference point for the control module 3. The comparator terminal (COMP) can be connected to an optocoupler circuit (not shown), and a fifth capacitor 22 can be connected between the comparator terminal (COMP) and the optocoupler circuit to achieve grounding. The zero voltage switch terminal (ZCS) can be connected to the input terminal of the second input loop 2 through the fifth resistor 211, and between the zero voltage switch terminal (ZCS) and the fifth resistor 211, the fourth capacitor 212 and the sixth resistor 213 can be connected in parallel to achieve grounding, and the fifth resistor 211, the fourth capacitor 212 and the sixth resistor 213 form a detection branch 21, and the detection branch 21 is used to ensure that the pin potential of the zero voltage switch terminal (ZCS) is normal. The driving end (GATE) of the field effect tube can be connected to the control end (not shown) of the MOS tube (not shown) of the control module 3. The power input terminal (VCC) can be connected between the first capacitor 12 and the fourth resistor 14 of the first input loop 1. The current detection terminal (CS) can be connected to the current detection resistor (not shown).

[0075] It is worth noting that the ground terminal (GND) is directly connected to the ground level, the output voltage fed back by the optocoupler is detected through the comparator terminal (COMP), the output power level of the charger is adjusted, and the QR mode valley detection, QR mode input voltage detection, OVP output voltage detection, etc. can be realized through the zero voltage switch terminal (ZCS). The field effect tube is controlled through the driving terminal (GATE) of the field effect tube, the control module 3 is kept working normally through the power input terminal (VCC), and the primary side peak current detection is realized through the current detection terminal (CS).

[0076] Based on the same concept, the embodiment of the present disclosure further provides a terminal, which includes the charging circuit 100 described above.

[0077] Figure 5 It is a schematic diagram of the power-on start-up time test results of the charging circuit in the related art. Figure 6 The figure is a schematic diagram of a startup time test result of a charging circuit according to an exemplary embodiment.

[0078] like Figure 5 As shown, the startup time of the charging circuit in the related art, AC stands for alternating current (Alternating Current), is affected by the charging time of the electrolytic capacitor of the soft start branch. The startup time test result of the charging circuit in the related art is 2.37S.

[0079] like Figure 6 As shown, the startup time of the charging circuit 100 of the present disclosure is not affected by the charging time of the second capacitor 41 of the input branch 4, and the startup time test result of the charging circuit of the present disclosure is 1.73S.

[0080] In summary, the embodiment of the present disclosure sets a first rectifier unit 42 in the input branch 4, and the first rectifier unit 42 cuts off the electrical signal from the first input loop 1 to the second capacitor 41 of the input branch 4. In this way, the voltage from the input port of the first input loop 1 directly charges the first capacitor 12 of the first input loop 1, which reduces the startup delay time of the control module, improves the user experience, and avoids the risk of misjudging the charging device failure.

[0081] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0082] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0083] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0084] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0085] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0086] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0087] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A charging circuit, characterized in that: include: A first input loop includes a power supply node and a first capacitor, wherein one end of the first capacitor is connected to the power supply node; The second input circuit; a control module, connected between the power supply node and the second input loop, and used to control the electrical signal output by the charging circuit, wherein the first capacitor provides a voltage to the power supply node; and An input branch connected between the power supply node and the second input loop, wherein the input branch includes a second capacitor and a first rectifying unit; The input branch provides voltage to the power node through the second capacitor, the first rectifier unit is arranged between the second capacitor and the power node, and the first rectifier unit is used to cut off the electrical signal from the first input loop to the second capacitor.

2. The charging circuit according to claim 1, characterized in that: The capacity of the second capacitor is greater than the capacity of the first capacitor.

3. The charging circuit according to claim 1, characterized in that: The first input loop is a high-voltage side input loop of the transformer, and the second input loop is an auxiliary winding side input loop of the transformer.

4. The charging circuit according to claim 1, characterized in that: The first input circuit and the second input circuit are both continuous power supply circuits.

5. The charging circuit according to claim 1, characterized in that: The input branch also includes: The second rectifying unit is connected between the second input loop and the second capacitor, and is used for cutting off the electrical signal from the second capacitor to the second input loop.

6. The charging circuit according to claim 5, characterized in that: The input branch also includes: A voltage stabilization node, one end of the second capacitor is connected to the voltage stabilization node, and the other end is grounded; A protection branch has one end connected to the second input circuit and the other end connected to the voltage stabilization node, and the protection branch is used to prevent the second input circuit from overvoltage.

7. The charging circuit according to claim 6, characterized in that: The protection branches include: A first resistor and a third capacitor are arranged in series, one end of the first resistor is connected to the second input loop, and one end of the third capacitor is connected between the second rectifying unit and the second capacitor.

8. The charging circuit according to claim 5, characterized in that: The first rectifying unit includes a diode, and / or, The second rectifying unit includes a diode.

9. The charging circuit according to claim 6, characterized in that: The input branch also includes: A current limiting unit is arranged between the protection branch and the second capacitor, and the current limiting unit is used to reduce the size of the electrical signal from the second input loop to the second capacitor.

10. The charging circuit according to claim 9, characterized in that: The current limiting unit includes a second resistor.

11. The charging circuit according to any one of claims 1 to 10, characterized in that: The first input loop also includes: A third resistor and a fourth resistor are arranged in series, one end of the third resistor is connected to the high voltage side of the transformer, and one end of the fourth resistor is connected to the first rectifying unit.

12. A terminal, characterized in that: The terminal comprises the charging circuit according to any one of claims 1-11.

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