Charging circuit and terminal with same

Abstract

The utility model provides a charging circuit and a terminal having the same. The charging circuit comprises an MOS switch unit used for delay conduction, a rectification unit and a filtering unit. The MOS switch unit is used for being electrically connected with an external power supply, so that surge current is reduced through delayed conduction of the MOS switch unit; the MOS switch unit is electrically connected with the rectification unit so as to perform rectification operation on an electric signal output by the MOS switch unit through the rectification unit. And the rectifying unit is connected with the filtering unit, so that the filtering unit filters the electric signal output by the rectifying unit to eliminate howling. According to the invention, the surge current is reduced by using the delayed conduction characteristic of the MOS switch unit; the rectification unit is used for rectification, and voltage fluctuation is further eliminated; and the voltage is further smoothed by using the filtering effect of the filtering unit, so that a remarkable effect on eliminating high-frequency noise and ripples is achieved, the condition that the alternating voltage frequency falls within the sensitive range of human ears is avoided, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging circuit technical field, concretely relates to a charging circuit and have its terminal. BACKGROUND

[0002] Capacitive pen is the pen that utilizes the conductor material to make and has the electrically conductive characteristic, is used to touch the capacitive screen and completes the man-machine dialogue operation, that is, utilizes the conductor material to imitate the human body (usually finger) and completes the man-machine dialogue an auxiliary device. The capacitive pen charging bin supporting wireless charging as a transmitting end converts direct current into alternating current, and then generates a changing magnetic field through a coil. The receiving end coil senses the magnetic field, and then converts the alternating current into direct current through a rectifier bridge. Finally, the device is charged.

[0003] Now the capacitive pen supporting wireless charging on the market will cause the capacitive pen to produce a howling sound when encountering unstable or excessive ripple power of the transmitting end or the receiving end, which affects efficiency and user experience. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of charging circuit and have its terminal to the deficiency in prior art, and specific scheme is as follows:

[0005] First part, the present application provides a kind of charging circuit, comprising: MOS switch unit for delay conduction, rectifier unit and filter unit;

[0006] The MOS switch unit is used to electrically connect external power supply, to reduce inrush current by MOS switch unit delay conduction;

[0007] The MOS switch unit is electrically connected with the rectifier unit, to rectify the electrical signal output by the MOS switch unit by the rectifier unit;

[0008] The rectifier unit is connected with the filter unit, to eliminate howling by filtering the electrical signal output by the rectifier unit by the filter unit.

[0009] In one specific embodiment, the MOS switch unit includes a P-type MOS tube module and an N-type MOS tube module, the P-type MOS tube module and the N-type MOS tube module are electrically connected with the external power supply, and the P-type MOS tube module is electrically connected with the N-type MOS tube module and the rectifier unit respectively.

[0010] In one specific embodiment, the P-type MOS tube module includes a PMOS, a first resistor, a second resistor and a first capacitor;

[0011] The PMOS is connected with the external power supply, the rectifier unit, the first resistor, the second resistor and the first capacitor respectively; the first capacitor is connected with the first resistor and the second resistor respectively; and the first resistor and the second resistor are connected with the N-type MOS tube module respectively.

[0012] In one specific embodiment, the N-type MOS tube module comprises an NMOS, a third resistor, a fourth resistor and a second capacitor.

[0013] One end of the third resistor is connected with the external power supply, and the other end of the third resistor is connected with one end of the fourth resistor, one end of the second capacitor and the gate of the NMOS respectively; the other end of the fourth resistor is grounded, and the other end of the second capacitor is grounded; the source of the NMOS is grounded, and the drain of the NMOS is connected with the P-type MOS tube module.

[0014] In one specific embodiment, the second capacitor comprises a variable capacitor.

[0015] In one specific embodiment, the rectifier unit comprises a rectifier diode, and the filter unit comprises a capacitor.

[0016] In one specific embodiment, the anode of the rectifier diode is connected with the MOS switch unit, and the cathode of the rectifier diode is connected with the capacitor.

[0017] In one specific embodiment, the application further comprises an electric energy receiving unit; one end of the electric energy receiving unit is connected with the external power supply, and the other end of the electric energy receiving unit is connected with the MOS switch unit to output direct current to the MOS switch unit.

[0018] In one specific embodiment, the application further comprises a charging output port, which is electrically connected with the rectifier unit and the filter unit respectively.

[0019] In the second part, the application provides a terminal comprising the charging circuit mentioned in the above technical solution.

[0020] Advantages:

[0021] The application utilizes the delay conduction characteristic of the MOS switch unit to reduce the inrush current; uses the rectifier unit to rectify, further eliminates voltage fluctuation; and uses the filtering effect of the filter unit to further smooth the voltage, which has a significant effect on eliminating high-frequency noise and ripple, thereby avoiding the situation that the alternating voltage frequency falls within the sensitive range of human ears and improving user experience. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 It is a charging circuit structure schematic diagram of the present application.

[0024] Figure 2 It is a charging circuit detailed structure schematic diagram of the present application.

[0025] Figure 3 It is a P-type MOS tube module structure schematic diagram of the present application.

[0026] Figure 4 It is an N-type MOS tube module structure schematic diagram of the present application.

[0027] The reference signs are as follows: 1-MOS switch unit; 11-P-type MOS tube module; 111-PMOS; 112-first resistor; 113-second resistor; 114-first capacitor; 12-N-type MOS tube module; 121-NMOS; 122-third resistor; 123-fourth resistor; 124-second capacitor; 2-rectifier unit; 3-filter unit; 4-electric energy receiving unit; 5-charging output port. DETAILED DESCRIPTION

[0028] The concept, specific structure and generated technical effects of the present application will be clearly and completely described below by combining with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application.

[0029] In the following, various embodiments of the present application will be described more fully. The present application can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit various embodiments of the present application to the specific embodiments disclosed herein, but the present application should be understood to cover all adjustments, equivalents and / or alternatives falling within the spirit and scope of various embodiments of the present application.

[0030] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of the disclosed functions, operations, or elements and does not limit one or more functions, operations, or elements from being added. Also, as used in various embodiments of the present application, the terms "include", "have", and their conjugates merely indicate that specific features, numbers, steps, operations, elements, components, or combinations thereof are present and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0031] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination of the listed terms or all combinations thereof. For example, the expression "A or B" or "at least one of A or / and B" can include A, can include B, or can include both A and B.

[0032] The expressions (such as "first", "second", etc.) used in various embodiments of the present application can modify various constituent elements in various embodiments, but can not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are used only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, the first element can be referred to as the second element, and likewise, the second element can be referred to as the first element without departing from the scope of various embodiments of the present application.

[0033] It should be noted that in the present application, unless otherwise explicitly specified and defined, the terms "mounting", "connection", "fixing", etc. should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, or can be indirect connection through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, it should be understood by those skilled in the art that the terms indicating the orientation or position relationship in the text are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] The terms used in the various embodiments of the present practical new type are only for the purpose of describing the specific embodiments and are not intended to limit the various embodiments of the present practical new type. As used herein, the singular form is intended to include the plural form as well, unless the context clearly dictates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present practical new type belong. The terms (such as those defined in a generally used dictionary) will be interpreted to have the same meaning as the contextual meaning in the related art and will not be interpreted to have an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the present practical new type.

[0036] Embodiment one

[0037] This embodiment uses the delay conduction characteristics of the MOS switch unit to reduce the inrush current; and uses the rectification unit for rectification, further eliminating voltage fluctuations; and further smoothes the voltage by using the filtering effect of the filter unit, which has a significant effect on eliminating high-frequency noise and ripple, thereby avoiding the case where the alternating voltage frequency falls within the sensitive range of human ears, and improving the user experience. The specific scheme is as follows:

[0038] A charging circuit, as shown in FIGS. 1 to 3, comprises a MOS switch unit 1 for delay conduction, a rectification unit 2 and a filter unit 3. Figure 1 and FIGS. 2 and 3, comprises a MOS switch unit 1 for delay conduction, a rectification unit 2 and a filter unit 3. Figure 2 The MOS switch unit 1 is used for electrically connecting an external power supply, so as to reduce the inrush current by the delay conduction of the MOS switch unit 1.

[0039] The MOS switch unit 1 is used for electrically connecting an external power supply, so as to reduce the inrush current by the delay conduction of the MOS switch unit 1.

[0040] The MOS switch unit 1 is electrically connected with the rectification unit 2, so as to perform rectification operation on the electrical signal output by the MOS switch unit 1 through the rectification unit 2.

[0041] The rectification unit 2 is connected with the filter unit 3, so as to perform filtering operation on the electrical signal output by the rectification unit 2 through the filter unit 3 to eliminate the howling.

[0042] The MOS switch unit 1 is electrically connected with the rectification unit 2, so as to perform rectification operation on the electrical signal output by the MOS switch unit 1 through the rectification unit 2.

[0043] Further, the electrical signal outputted by the MOS switch unit 1 is sent to the rectifier unit 2. The rectifier unit 2 rectifies the electrical signal outputted by the MOS switch unit 1 by using its core element, the rectifier diode, to further reduce the ripple and ensure the stability of the voltage; then, the electrical signal outputted by the rectifier unit 2 is sent to the filter unit 3. The filter unit 3 further filters the rectified electrical signal by using its internal capacitors and other elements to eliminate the possible howling phenomenon and voltage fluctuation.

[0044] In one embodiment, the MOS switch unit 1 comprises a P-type MOS tube module 11 and an N-type MOS tube module 12, both of which are electrically connected to the external power supply, and the P-type MOS tube module 11 is electrically connected to the N-type MOS tube module 12 and the rectifier unit 2 respectively.

[0045] In this embodiment, the MOS switch unit 1 integrates the P-type MOS tube module 11 and the N-type MOS tube module 12, both of which are independently electrically connected to the external power supply, ensuring stable power supply, and the P-type MOS tube module 11 and the N-type MOS tube module 12 are electrically connected.

[0046] In actual application, the electrical signal from the external power supply first passes through the delay control circuit of the N-type MOS tube module 12. The gate of the N-type MOS tube module 12 receives a control signal, which, after a certain delay, makes the N-type MOS tube module 12 conduct or cut off. When the N-type MOS tube module 12 is turned on, it allows current to pass through its channel, which in turn controls the gate voltage of the P-type MOS tube module 11, making the P-type MOS tube module 11 gradually conduct.

[0047] By delaying the control of the N-type MOS tube module 12, the conduction speed of the P-type MOS tube module 11 can be slowed down, thereby avoiding the generation of excessive inrush current at the moment of power-on. Inrush current refers to the peak current flowing into the power supply device at the moment of power-on, which may cause damage to the circuit or affect the stability of the circuit. By slowing down the conduction speed of the P-type MOS tube module 11, the power output can be made more stable, reducing the impact of inrush current on the circuit.

[0048] Further, the P-type MOS tube module 11 is electrically connected to the rectifier unit 2, so that the rectifier unit 2 receives the power signal processed by the P-type and N-type MOS tube modules through the connection with the P-type MOS tube module 11 and performs subsequent rectification operation.

[0049] In one embodiment, as shown in FIG. 2, the MOS switch unit 1 comprises a P-type MOS tube module 11 and an N-type MOS tube module 12, both of which are electrically connected to the external power supply, and the P-type MOS tube module 11 is electrically connected to the N-type MOS tube module 12 and the rectifier unit 2 respectively. Figure 3As shown, the P-type MOS module 11 includes a PMOS 111, a first resistor 112, a second resistor 113 and a first capacitor 114.

[0050] The PMOS 111 is connected to an external power supply, the rectifier unit 2, the first resistor 112, the second resistor 113 and the first capacitor 114, respectively. The first capacitor 114 is connected to the first resistor 112 and the second resistor 113, respectively. The first resistor 112 and the second resistor 113 are connected to the N-type MOS module 12.

[0051] The PMOS 111 is the core of the module, and its gate, drain and source are responsible for receiving control signals, outputting current and grounding, respectively. One end of the PMOS 111 is connected to an external power supply, ensuring stable power supply. The other end is connected to the rectifier unit 2, the first resistor 112, the second resistor 113 and the first capacitor 114, respectively, forming a complex control circuit.

[0052] The first capacitor 114 is cleverly arranged between the first resistor 112 and the second resistor 113, which helps to smooth the control signal, reduce noise interference and improve the accuracy and stability of the MOS switch unit action. At the same time, the first resistor 112 and the second resistor 113 also undertake the task of connecting to the N-type MOS module 12. They adjust the current and voltage to achieve effective signal transmission and cooperative work between the P-type MOS module 11 and the N-type MOS module 12.

[0053] In one embodiment, as shown in the accompanying drawings Figure 4 As shown, the N-type MOS module 12 includes an NMOS 121, a third resistor 122, a fourth resistor 123 and a second capacitor 124.

[0054] One end of the third resistor 122 is connected to an external power supply. The other end of the third resistor 122 is connected to one end of the fourth resistor 123, one end of the second capacitor 124 and the gate of the NMOS 121, respectively. The other end of the fourth resistor 123 is grounded, and the other end of the second capacitor 124 is grounded. The source of the NMOS 121 is grounded, and the drain of the NMOS 121 is connected to the P-type MOS module 11.

[0055] The NMOS 121 is the core component of the module, and its gate is responsible for receiving control signals, and its drain is used for outputting current, while its source is grounded. The gate of the NMOS 121 is connected to the third resistor 122, the fourth resistor 123 and the second capacitor 124, forming a complex control circuit.

[0056] One end of the third resistor 122 is connected to an external power supply, ensuring stable power supply. The other end is connected to one end of the fourth resistor 123, one end of the second capacitor 124, and the gate of the NMOS 121, respectively. This connection allows the third resistor 122 to regulate the gate voltage, thereby controlling the MOS switch unit state of the NMOS 121. The other end of the fourth resistor 123 is grounded, providing a stable reference potential for the circuit. At the same time, the second capacitor 124 is also grounded, forming part of an RC circuit with the third resistor 122. This helps smooth the gate voltage, reduces noise interference, and improves the accuracy and stability of the MOS switch unit operation.

[0057] Further, the drain of the NMOS 121 is connected to the P-type MOS tube module 11, realizing signal transmission and cooperative work between the two modules. The source is grounded, ensuring that the NMOS 121 can work stably during the MOS switch unit process.

[0058] In one embodiment, the second capacitor 124 includes a variable capacitor. The variable capacitor is characterized by its capacitance, which can be dynamically adjusted according to external conditions or requirements, thereby achieving precise control of circuit characteristics. In this embodiment, the conduction time of the NMOS 121 can be delayed by changing the capacitance of the second capacitor 124.

[0059] In practical applications, the capacitance of the second capacitor 124 can also be flexibly adjusted according to factors such as voltage fluctuations, load changes, and other factors in the actual application scenario, to optimize the response speed, stability, and efficiency of the circuit. For example, in situations requiring fast response, the capacitance of the variable capacitor can be appropriately reduced to speed up the response of the circuit; while in situations requiring stable output, the capacitance of the variable capacitor can be increased to enhance the anti-interference ability and stability of the circuit.

[0060] Designing the second capacitor 124 in the N-type MOS tube module 12 as a variable capacitor not only enhances the flexibility and adaptability of the circuit, but also provides more possibilities for debugging and optimization of the circuit, further improving the performance and reliability of the entire charging circuit.

[0061] In one embodiment, the rectifier unit 2 includes a rectifier diode, and the filter unit 3 includes a capacitor. The rectifier diode has unidirectional conductivity, allowing current to flow only in one direction, which helps to further eliminate voltage fluctuations.

[0062] The filter unit 3 is mainly composed of a capacitor. In this embodiment, the filter unit 3 is preferably a tantalum capacitor, which has the advantages of good high-frequency characteristics, small leakage current, stable performance, etc., and can effectively filter out high-frequency noise and ripple in the voltage. Through the filtering effect of the large-capacity tantalum capacitor, the direct current voltage can be further smoothed, and the frequency of alternating voltage can be eliminated or shifted, so as to avoid falling within the audio range most sensitive to the human ear, and has a significant effect on eliminating high-frequency noise and ripple.

[0063] In one specific embodiment, the positive electrode of the rectifier diode is connected with the MOS switch unit 1, and the negative electrode of the rectifier diode is connected with the capacitor. The rectifier diode has unidirectional conductivity, allowing current to flow only in one direction, which helps to further eliminate voltage fluctuations.

[0064] In one specific embodiment, it further includes an electric energy receiving unit 4; one end of the electric energy receiving unit 4 is connected with an external power supply, and the other end is connected with the MOS switch unit 1, so as to output direct current to the MOS switch unit 1.

[0065] One end of the electric energy receiving unit 4 is connected with an external power supply, ensuring stable power input. The other end is closely connected with the MOS switch unit 1, and the electric energy receiving unit 4 will convert the electric energy received from the external power supply into direct current and output it to the MOS switch unit 1. This simplifies the circuit structure and improves the efficiency of electric energy transmission.

[0066] In actual application, the parameters and settings of the electric energy receiving unit 4 can be adjusted according to actual needs to optimize the electric energy transmission and conversion efficiency of the circuit, thereby further improving the performance and reliability of the entire charging circuit.

[0067] In one specific embodiment, it further includes a charging output port 5, which is electrically connected with the rectifier unit 2 and the filter unit 3 respectively. The charging output port 5 is electrically connected with the rectifier unit 2 and the filter unit 3 respectively, ensuring that the electric energy input from the external power supply can be smoothly output to external devices through the charging output port 5 after being rectified and filtered.

[0068] In this embodiment, the design of the charging output port 5 fully considers safety and stability. It uses high-quality electrical connection materials and has undergone strict electrical performance tests to ensure stable electrical performance and good heat dissipation performance during long-term and high-load use. In addition, the charging output port 5 also has a certain compatibility and can adapt to the charging needs of various external devices. Whether it is a mobile phone, tablet computer or other types of electronic devices, they can be charged through the charging output port 5.

[0069] Embodiment Two

[0070] The embodiment provides a terminal, which comprises the charging circuit mentioned in the technical scheme of the first embodiment.

[0071] The application utilizes the delay conduction characteristic of the MOS switch unit to reduce the inrush current; utilizes a diode to rectify, further eliminates voltage fluctuation; utilizes the filtering effect of the tantalum capacitor, further smoothes the voltage, has a significant effect on eliminating high-frequency noise and ripple, thereby avoiding the situation that the alternating voltage frequency falls in the sensitive range of human ears, and improving user experience.

[0072] The above is a specific description of the preferred embodiment of the utility model, but the utility model is not limited to the embodiment, and various equivalent modifications or replacements can be made by those skilled in the art without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the application.

Claims

1. A charging circuit, characterized by, The application relates to a charging circuit. The MOS switch unit is used for electrically connecting an external power supply, so as to reduce inrush current by delaying the conduction of the MOS switch unit. The MOS switch unit is electrically connected with the rectifier unit, so as to perform rectification operation on the electrical signal output by the MOS switch unit through the rectifier unit. The rectifier unit is connected with the filter unit, so as to perform filtering operation on the electrical signal output by the rectifier unit through the filter unit to eliminate howling. The MOS switch unit comprises a P-type MOS tube module and an N-type MOS tube module, and the P-type MOS tube module and the N-type MOS tube module are electrically connected with the external power supply.

2. A charging circuit according to claim 1, wherein The P-type MOS tube module comprises a PMOS, a first resistor, a second resistor and a first capacitor.

3. A charging circuit according to claim 2, wherein The PMOS is connected with the external power supply, the rectifier unit, the first resistor, the second resistor and the first capacitor respectively. The first capacitor is connected with the first resistor and the second resistor respectively.

4. A charging circuit according to claim 2, wherein The first resistor and the second resistor are connected with the N-type MOS tube module respectively. The N-type MOS tube module comprises an NMOS, a third resistor, a fourth resistor and a second capacitor. One end of the third resistor is connected with the external power supply, and the other end of the third resistor is connected with one end of the fourth resistor, one end of the second capacitor and the gate of the NMOS respectively.

5. A charging circuit according to claim 4, wherein The other end of the fourth resistor is grounded, and the other end of the second capacitor is grounded.

6. A charging circuit according to claim 1, wherein The source of the NMOS is grounded, and the drain of the NMOS is connected with the P-type MOS tube module.

7. A charging circuit according to claim 6, wherein The second capacitor comprises a variable capacitor.

8. The charging circuit of claim 1, wherein, The rectifier unit comprises a rectifier diode, and the filter unit comprises a capacitor.

9. The charging circuit of claim 1, wherein, The positive electrode of the rectifier diode is connected with the MOS switch unit, and the negative electrode of the rectifier diode is connected with the capacitor.

10. A terminal, characterized by comprising: The application further comprises an electric energy receiving unit. One end of the electric energy receiving unit is connected with the external power supply, and the other end of the electric energy receiving unit is connected with the MOS switch unit, so as to output direct current to the MOS switch unit. The charging circuit comprises the charging circuit of any one of claims 1-9.

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