CN111316524A - Charging circuit for intelligent terminal and intelligent terminal with same - Google Patents
Charging circuit for intelligent terminal and intelligent terminal with same Download PDFInfo
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- CN111316524A CN111316524A CN201780095904.9A CN201780095904A CN111316524A CN 111316524 A CN111316524 A CN 111316524A CN 201780095904 A CN201780095904 A CN 201780095904A CN 111316524 A CN111316524 A CN 111316524A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Abstract
A charging circuit for a smart terminal (200) and the smart terminal (200) having the same, the charging circuit comprising a charging control module (101) and a battery (103), the charging control module (101) comprising: the charging control chip (102) at least comprises a power input pin (1021), a power output pin (1022) and an electric load pin (1023), wherein the power input pin (1021) is an input end of the charging control module (101), the power output pin (1022) is an output end of the charging control module (101), and the electric load pin (1023) supplies power to an electric load (105) in the intelligent terminal (200); a first protection element (106), a first end of the first protection element (106) being connected to the power input pin (1021), a second end of the first protection element (106) being connected to ground; a second protection element (107), a first end of the second protection element (107) is connected with the electrical load pin (1023), and a second end of the second protection element (107) is connected with ground. After the technical scheme is adopted, high-grade surge protection is realized, and the reliability of the intelligent terminal (200) is improved.
Description
The invention relates to the field of intelligent terminals, in particular to a charging circuit for an intelligent terminal and the intelligent terminal with the charging circuit.
At present, intelligent terminal devices such as smart phones, tablet computers and multimedia players are often used in daily life and work, and people can conveniently realize functions of contacting the outside, browsing files, entertainment and the like. A battery is arranged in the intelligent terminal and provides a working power supply for the intelligent terminal. The electrical energy storage capacity of the battery is limited and the battery needs to be charged by an external power source before it is exhausted. The battery of the intelligent terminal is designed differently, the capacity of the battery is 1000 mAh-4000 mAh, and the time for fully charging the battery of the intelligent terminal is usually 1-3 hours according to the current technical conditions.
The intelligent terminal needs to be connected with an external power supply during charging, however, the voltage of the external power supply is not always stable, and the surge is likely to occur. The surge (Electrical supply), as the name implies, is the instantaneous occurrence of a peak value that exceeds a steady value, which includes a surge voltage and a surge current. Surges are also called surge waves, which are transient over-voltages that exceed normal operating voltages. In essence, a surge is a sharp pulse that occurs in only a few millionths of a second. The reasons that surge may be caused are: heavy equipment, short circuits, power switches, or large engines. The electric equipment needs to work in a stable voltage interval, the voltage can exceed the working voltage range of the electric equipment due to the existence of the surge, the electric equipment can be greatly damaged by the visible surge, and particularly for the precise equipment such as the intelligent terminal, most of electronic elements in the intelligent terminal work at a weak current voltage level, are very fragile and need to be protected against the surge. The intelligent terminal is the most common situation that electrical contact is generated with the outside when charging, so that the surge protection is particularly important in the charging link of the intelligent terminal. The prior art has made efforts on surge protection, and the main technical means is to manage the charging process by using a charging control chip, and a voltage stabilizing diode is connected in parallel with the power input end of the charging control chip, so that when a surge occurs, the voltage input into the charging control chip is stabilized on the rated voltage by the voltage stabilizing diode, and subsequent electronic components are protected from the impact of high voltage. However, the prior art still has the following problems:
1. in the prior art, a voltage stabilizing diode with rated voltage of 7V is often adopted, and the voltage stabilizing diode is easily burnt out when surge occurs;
2. if a voltage stabilizing diode with the rated voltage of 12V is adopted, the charging control chip is damaged under the condition of low surge voltage (50V surge) because the design voltage resistance of the charging control chip is low.
Therefore, a charging circuit with a higher surge protection level is needed, which can ensure that the surge carrying capacity of the charging circuit is greatly improved compared with the prior art when the intelligent terminal is charged.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a charging circuit for an intelligent terminal and the intelligent terminal with the charging circuit.
The first aspect of this application discloses a charging circuit for intelligent terminal locates in the intelligent terminal, including charging control module and battery, charging control module's input is connected with external power source, charging control module's output with the battery is connected, to the battery provides charging current, charging control module includes:
the charging control chip at least comprises a power input pin, a power output pin and an electricity utilization load pin, wherein the power input pin is an input end of the charging control module, the power output pin is an output end of the charging control module, and the electricity utilization load pin supplies electricity to an electricity utilization load in the intelligent terminal;
a first protection element, a first end of the first protection element being connected to the power input pin, a second end of the first protection element being connected to ground;
a second protection element, wherein a first end of the second protection element is connected with the electric load pin, and a second end of the second protection element is connected with the ground;
when the external power supply generates a surge, the first protection element maintains the external power supply voltage at a first voltage, and the second protection element maintains the electric load voltage at a second voltage.
Preferably, the first voltage ranges from 10V to 15V; the second voltage ranges from 6V to 8V.
Preferably, the first protection element and the second protection element are zener diodes, cathodes of the zener diodes are first ends, and anodes of the diodes are second ends.
Preferably, the first protection element is a transient suppression diode, a cathode of the transient suppression diode is a first terminal, and an anode of the transient suppression diode is a second terminal.
Preferably, the first protection element and the second protection element are piezoresistors.
Preferably, the charging control chip includes a switching tube, an input end of the switching tube is connected to the power input pin, and an output end of the switching tube is connected to the power load pin; the switch tube allows current to flow from the power input pin to the electric load pin in a single direction.
Preferably, the charging control chip further comprises a temperature detection pin, and the temperature detection pin is connected with a temperature detection circuit and used for detecting the temperature in the intelligent terminal.
Preferably, the charging control chip further includes a serial communication pin for performing serial communication with other devices.
In a second aspect of the present application, an intelligent terminal is disclosed, which includes the above charging circuit.
Preferably, the intelligent terminal further comprises: and the main control unit is arranged on the intelligent terminal mainboard, is connected with the charging control chip and is in serial communication with external equipment through the charging control chip.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. high-level surge protection is realized, and the reliability of the intelligent terminal is improved;
2. the cost is low.
Fig. 1 is a circuit diagram of a charging circuit for an intelligent terminal in the prior art;
fig. 2 is a schematic diagram of a charging circuit for an intelligent terminal according to a preferred embodiment of the present invention;
FIG. 3 is a circuit diagram of a charging circuit for a smart terminal in accordance with a preferred embodiment of the present invention;
FIG. 4 is a block diagram of a charge control chip according to a preferred embodiment of the present invention;
fig. 5 is a schematic structural diagram of an intelligent terminal according to a preferred embodiment of the present invention.
Reference numerals:
101-charging control module, 102-charging control chip, 1021-power input pin, 1022-power output pin, 1023-power load pin, 1024-switching tube, 103-battery, 104-external power supply, 105-power load, 106-first protection element, 107-second protection element, 200-intelligent terminal and main control unit 201.
The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.
In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.
Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise, it should be further understood that the terms "comprises" and "comprising" indicate the presence of the stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups. A; b; c; a and B; a and C; b and C; A. b and C ". an exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
As used herein, the term "if" may be interpreted to mean "when …" or "once …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if it is determined" or "if the [ stated condition or event ] is detected" is optionally to be interpreted depending on the context to mean "upon determining," or "in response to determining" or "upon detecting the [ stated condition or event ]" or "in response to detecting the [ stated condition or event ]".
Referring to fig. 1, a circuit diagram of a charging circuit for a smart terminal in the prior art is shown, in which only one protection element, i.e., a first protection element 106, i.e., a surge protection device is provided. The surge protection device is disposed at the front end of the Vbus pin of the charging control chip 102 (U602 in fig. 1), that is, the front end of the power input pin 1021. Because the charging voltage is direct current 5V, the working voltage of the surge protection device is 7V under the conventional condition, however, the surge protection device with the working voltage of 7V is easy to burn out with direct current high voltage, and the other scheme is to adopt the 12V surge protection device, which has the defect that when the intelligent terminal carries out surge test under the charging state, the charging control chip 102 is damaged due to the low voltage resistance of the design of the charging control chip 102 when the surge voltage is low (50V surge).
Referring to fig. 2 and 3, a schematic structural diagram and a circuit diagram of a charging circuit for an intelligent terminal according to a preferred embodiment of the present invention are shown, the charging circuit is disposed in the intelligent terminal 200, and includes a charging control module 101 and a battery 103, an input end of the charging control module 101 is connected to an external power source 104, an output end of the charging control module 101 is connected to the battery 103, and provides a charging current to the battery 103, and the charging control module 101 includes:
charging control chip 102
The charging control chip 102 at least includes a power input pin 1021, a power output pin 1022, and an electrical load pin 1023, wherein the power input pin 1021 is an input terminal of the charging control module 101, the power output pin 1022 is an output terminal of the charging control module 101, and the electrical load pin 1023 supplies power to an electrical load 105 in the smart terminal 200. The charging control chip 102 is preferably model BQ24195 or other models in the family. With the development of the intelligent terminal 200 technology, the charging management thereof is more and more intelligent and integrated, and the charging process is often managed by using the high-performance charging control chip 102, so that the charging safety is ensured, and the service life of the battery 103 is prolonged.
The battery 103 is a main energy storage component in the intelligent terminal 200, and may be classified into a lithium battery, a lead-acid battery, and the like according to different storage media. Mainstream be applied to intelligent terminal 200's battery 103 is the lithium cell, battery 103's charging voltage is 4.2V, and operating voltage is 3.7V, and for lead-acid batteries, the energy density of lithium cell is higher, and light in weight is fit for as handheld device's energy storage part.
A first protective element 106
A first end of the first protection element 106 is connected to the power input pin 1021, and a second end of the first protection element 106 is connected to ground. The first protection element 106 may be a surge absorber, a diode, a varistor, or other electronic device capable of absorbing a surge. The first protection element 106 is disposed at the power input pin 1021 of the charging control chip 102 to provide surge protection at the source.
Second protective element 107
A first end of the second protection element 107 is connected to the electrical load pin 1023, and a second end of the second protection element 107 is connected to ground. The second protection element 107 may be a surge absorber, a diode, a varistor, or the like electronic device capable of absorbing a surge. The second protection element 107 is disposed at the electric load pin 1023 of the charging control chip 102, and provides surge protection for the electric load.
The first protection element 106 and the second protection element 107 are characterized in that when the external voltage is lower than the rated voltage, the high-resistance state is maintained, and current flows into the subsequent electronic components; when the external voltage is greater than the rated voltage, an approximate breakdown state is formed, and the current flows through the first protection element 106 or the second protection element 107 without causing impact on subsequent electronic components. That is to say, the first protection element 106 and the second protection element 107 have a voltage stabilizing function. When the external power source 104 generates a surge, the first protection element 106 maintains the voltage of the external power source 104 at a first voltage, and the second protection element 107 maintains the voltage of the power load 105 at a second voltage.
The first voltage is a rated voltage of the first protection element 106, and the second voltage is a rated voltage of the second protection element 107. It should be noted that the rated voltages of the first protection element 106 and the second protection element 107 are different, and the power supplied by the external power source 104 has a voltage drop after passing through the charging control chip 102, so that the rated voltage of the second protection element 107 is lower than the rated voltage of the first protection element 106, which can form step protection, and if the rated voltage of the second protection element 107 is higher than the rated voltage of the first protection element 106, it is meaningless because the first protection element 106 reaches the rated voltage first and breaks down, and the second protection element 107 does not reach the rated voltage and does not play a role in protection.
As a further improvement of the charging circuit, the first voltage ranges from 10V to 15V; the second voltage ranges from 6V to 8V. The present modified embodiment is preferable for the operating voltages of the first protection element 106 and the second protection element 107. The rated voltage of the first protection element 106 is between 10V and 15V, preferably 12V; the rated voltage of the second protection element 107 is between 6V and 8V, preferably 7V. The voltage selection takes into account the input voltage of the charging control chip 102 and the operating voltages of the components within the smart terminal 200.
As a further improvement of the charging circuit, the first protection element 106 and the second protection element 107 are zener diodes, cathodes of the zener diodes are first ends, and anodes of the diodes are second ends. The Zener diode, also called Zener diode, is a diode with a function of stabilizing voltage, which is manufactured by utilizing the phenomenon that the current of a pn junction can change in a large range and the voltage is basically unchanged in a reverse breakdown state. The diode is a semiconductor device having a high resistance up to a critical reverse breakdown voltage. At the critical breakdown point, the reverse resistance is reduced to a small value, the current is increased in the low-resistance region, the voltage is kept constant, and the voltage regulator diodes are graded according to the breakdown voltage, so that the voltage regulator tubes are mainly used as voltage regulators or voltage reference elements due to the characteristic. The zener diodes can be connected in series for use at higher voltages, with higher regulated voltages being obtained by the series connection. The zener diodes can be classified into various types according to different working voltages, so that the zener diodes with corresponding rated voltages can be selected as the first protection element 106 and the second protection element 107 according to actual needs. The zener diode should, in use, connect the cathode to a high voltage point and the anode to ground, i.e. in reverse connection. The forward characteristic of the volt-ampere characteristic curve of the voltage stabilizing diode is similar to that of a common diode, and the reverse characteristic is that when the reverse voltage is lower than the reverse breakdown voltage, the reverse resistance is large, and the reverse leakage current is extremely small. However, when the reverse voltage approaches the threshold value of the reverse voltage, the reverse current increases abruptly, called breakdown, at which point the reverse resistance drops abruptly to a very small value. The voltage across the diode is substantially stabilized around the breakdown voltage despite the wide range of current variations, thereby achieving the voltage stabilization function of the diode.
As a further improvement of the charging circuit, the first protection element 106 is a transient suppression diode, a cathode of the transient suppression diode is a first terminal, and an anode of the transient suppression diode is a second terminal. The first protection element 106 plays the most important role in the overall protection surge measure, and is the first line of defense, when a surge occurs, the current retained by the first protection element 106 is very large, so that a component suitable for a large-current working situation needs to be selected, and in the preferred embodiment, a transient suppression diode is selected as the first protection element 106. A Transient Voltage Suppressor (TVS) is a diode-type high-performance protection device. When two poles of the TVS are impacted by reverse transient high energy, the TVS can change the high impedance between the two poles into low impedance at the speed of 10 to the power of minus 12 seconds, absorb the surge power of thousands of watts and clamp the voltage between the two poles at a preset value, thereby effectively protecting precise components in an electronic circuit from being damaged by various surge pulses. The transient suppression diode also adopts an inverse connection mode, the cathode of the transient suppression diode is connected with a high voltage point, and the anode of the transient suppression diode is grounded. The TVS device can be divided into unipolar devices and bipolar devices according to polarity, and can be divided into general-purpose devices suitable for various circuits and special-purpose devices suitable for special circuits according to usage. Such as: various alternating voltage protectors, 4-200 mA current environmental protection devices, data line protectors, coaxial cable protectors, telephone protectors and the like. If the package and the internal structure can be divided into: axial lead diodes, dual in-line TVS arrays (suitable for multi-line protection), patch, modular, and high power modular, etc.
As a further improvement of the charging circuit, the first protection element 106 and the second protection element 107 are piezoresistors. The voltage dependent resistor is a voltage limiting type protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when overvoltage appears between two electrodes of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively fixed voltage value, so that the protection of a rear-stage circuit is realized. The main parameters of the varistor are: voltage dependent voltage, current capacity, junction capacitance, response time, etc. The response time of the piezoresistor is ns grade, is faster than that of a gas discharge tube and is slightly slower than that of a TVS tube, and the response speed of the piezoresistor used for overvoltage protection of an electronic circuit can meet the requirement under the general condition. The junction capacitance of the piezoresistor is generally in the order of magnitude range of hundreds to thousands of Pf, and is not suitable for being directly applied to the protection of a high-frequency signal line under many conditions. The varistor has a larger through-current capacity but a smaller through-current capacity than the gas discharge tube. A voltage dependent resistor, VDR for short, is a voltage sensitive non-linear overvoltage protection semiconductor device. The piezoresistors are less costly than the transient suppression diodes, which may be an alternative. The piezoresistor is used in parallel with the protected electrical equipment or components, when lightning overvoltage or transient operation overvoltage Vs occurs in the circuit, the piezoresistor, the protected equipment and the protected components bear the Vs, because the piezoresistor has high response speed, the piezoresistor rapidly presents excellent nonlinear conductive characteristic in nanosecond time, the voltage at two ends of the piezoresistor rapidly drops far less than the Vs, and the voltage actually borne by the protected equipment and the protected components is far lower than the overvoltage Vs, so that the equipment and the components are prevented from being impacted by the overvoltage.
As a further improvement of the charging circuit, the charging control chip 102 further includes a temperature detection pin, see TS1 and TS2 pins in fig. 3. The temperature detection pin is connected with a temperature detection circuit to detect the temperature in the intelligent terminal 200. The charging circuit and the battery 103 are working parts which are liable to generate heat, and particularly when charging, they are liable to generate heat, damage parts or reduce the life of parts, and in severe cases, may cause fire. Therefore, temperature detection needs to be performed inside the intelligent terminal 200, particularly temperature detection needs to be performed on components which are easy to generate heat, a thermistor can be arranged on the components, then the thermistor is electrified to generate voltage, the temperature detection pin detects the voltage of the thermistor, and when the temperature changes, the resistance value of the thermistor changes, and the voltage changes synchronously, so that the voltage changes can be detected. The resistance value of the thermistor can be changed under the influence of temperature, and the change of the temperature can be obtained by detecting the resistance value of the thermistor. The thermistor is divided into a positive temperature coefficient thermistor (PTC) and a negative temperature coefficient thermistor (NTC) according to different temperature coefficients. Thermistors are typically temperature sensitive and exhibit different resistance values at different temperatures. A positive temperature coefficient thermistor (PTC) has a higher resistance value at a higher temperature, and a negative temperature coefficient thermistor (NTC) has a lower resistance value at a higher temperature, which are semiconductor devices. And after the processor in the intelligent terminal samples the resistance value of the thermistor, calculating to obtain a temperature value according to a conversion relation between the prestored resistance value and the temperature.
As a further improvement of the charging circuit, the charging control chip 102 further includes serial communication pins, see SDA, SCL and OTG pins in fig. 3. The charging control chip 102 performs serial communication with other devices through the pins. OTG is an abbreviation of On-The-Go, is a technology developed in recent years, is published by USB Implementers Forum in 2001, 12 months and 18 days, and is mainly applied to connection between various devices or mobile devices for data exchange. The OTG technology is to realize data transmission between devices without Host, for example, a digital camera is directly connected to a printer, and a USB port between two devices is connected by the OTG technology to immediately print out a photographed photo; the data in the digital camera can also be sent to a mobile hard disk of a USB interface through OTG, and the field operation does not need to carry an expensive memory card or carry a portable computer. Through the OTG technology, USB interface accessories can be expanded for the intelligent terminal to enrich the functions of the intelligent terminal, for example, remote controller accessories are expanded, and a mobile phone and a tablet are changed into a universal remote controller for use, particularly a Pad, a mobile phone and consumer equipment. The inconvenience of data exchange between 7-system memory cards, such as connectors of different systems between devices such as digital cameras, video cameras and printers, is changed.
Referring to fig. 4, which is a block diagram of a charging control chip 102 according to a preferred embodiment of the present invention, the charging control chip 102 includes:
switching tube 1024
The input end of the switching tube 1024, i.e., Q1 in the figure, is connected to the power input pin 1021, the output end of the switching tube 1024 is connected to the power load pin 1023, and the control end of the switching tube 1024 is connected to the power input pin 1021. The switch tube 1024 allows current to flow from the power input pin 1021 to the power load pin 1024 in one direction, i.e., prevents current from flowing in the opposite direction, and does not output voltage to the outside. Since the control terminal of the switching tube 1024 is connected to the power input pin 1021, the voltage of the control terminal is consistent with the voltage of the external power source 104, when the voltage of the electrical load pin 1023 is lower than the voltage of the external power source 104, the switching tube 1024 is turned on, and normal charging can be performed; when the voltage of the load pin 1023 is higher than the voltage of the external power source 104, the switch tube 1024 is turned off, and no current flows between the power input pin 1021 and the load pin 1024.
The switching tube 1024 is preferably a field effect tube. A Field Effect Transistor (FET)) is called a unipolar Transistor, which is called a Field Effect Transistor (FET) and is conductive by majority carriers. The high-voltage power transistor belongs to a voltage control type semiconductor device, has the advantages of high input resistance (107-1015 omega), low noise, low power consumption, large dynamic range, easiness in integration, no secondary breakdown phenomenon, wide safe working area and the like, and is a strong competitor of a bipolar transistor and a power transistor.
As can be seen from fig. 4, after the current flows to the electric load pin 1023, the current continues to flow to components such as Q2, Q3, and the like, the second protection element 107 can effectively protect other components in the charging control chip 102 from high voltage impact, so that the surge resistance of the charging control chip 102 is enhanced.
Referring to fig. 5, a schematic structural diagram of an intelligent terminal 200 according to a preferred embodiment of the present invention is shown, where the intelligent terminal includes the charging circuit. The intelligent terminal 200 further includes:
a master control unit 201
The main control unit 201 is disposed on the intelligent terminal motherboard, connected to the charging control chip 102, and performs serial communication with an external device through the charging control chip 102. The main control unit 201, namely the CPU of the intelligent terminal 200, undertakes most of the work tasks during the operation of the intelligent terminal 200, and can store data, perform calculation and logic judgment, and have an input/output interface. The main control unit 201 has a serial interface, and when the smart terminal 200 is connected to an external device through a USB interface, the main control unit 201 may be connected to the charging control chip 102 and communicate with the external device through the charging control chip 102.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
- A charging circuit for an intelligent terminal, which is arranged in the intelligent terminal and comprises a charging control module and a battery, wherein the input end of the charging control module is connected with an external power supply, and the output end of the charging control module is connected with the battery to provide charging current for the battery, and the charging control module comprises:the charging control chip at least comprises a power input pin, a power output pin and an electricity utilization load pin, wherein the power input pin is an input end of the charging control module, the power output pin is an output end of the charging control module, and the electricity utilization load pin supplies electricity to an electricity utilization load in the intelligent terminal;a first protection element, a first end of the first protection element being connected to the power input pin, a second end of the first protection element being connected to ground;a second protection element, wherein a first end of the second protection element is connected with the electric load pin, and a second end of the second protection element is connected with the ground;when the external power supply generates a surge, the first protection element maintains the external power supply voltage at a first voltage, and the second protection element maintains the electric load voltage at a second voltage.
- The charging circuit of claim 1,the first voltage ranges from 10V to 15V;the second voltage ranges from 6V to 8V.
- The charging circuit of claim 2,the first protection element and the second protection element are voltage stabilizing diodes, cathodes of the voltage stabilizing diodes are first ends, and anodes of the diodes are second ends.
- The charging circuit of claim 3,the first protection element is a transient suppression diode, a cathode of the transient suppression diode is a first end, and an anode of the transient suppression diode is a second end.
- The charging circuit of claim 2,the first protection element and the second protection element are piezoresistors.
- The charging circuit according to any one of claims 1 to 5,the charging control chip comprises a switch tube, the input end of the switch tube is connected with the power supply input pin, and the output end of the switch tube is connected with the power load pin;the switch tube allows current to flow from the power input pin to the electric load pin in a single direction.
- The charging circuit according to any one of claims 1 to 5,the charging control chip further comprises a temperature detection pin, and the temperature detection pin is connected with a temperature detection circuit and used for detecting the temperature in the intelligent terminal.
- The charging circuit according to any one of claims 1 to 5,the charging control chip further comprises a serial communication pin which is in serial communication with other equipment.
- An intelligent terminal is characterized in that a terminal body is provided with a plurality of terminals,the intelligent terminal comprises the charging circuit of claim 1.
- The intelligent terminal of claim 9,the intelligent terminal further comprises:and the main control unit is arranged on the intelligent terminal mainboard, is connected with the charging control chip and is in serial communication with external equipment through the charging control chip.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/105989 WO2019071556A1 (en) | 2017-10-13 | 2017-10-13 | Charging circuit for use with smart terminal and smart terminal having circuit |
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| CN111316524A true CN111316524A (en) | 2020-06-19 |
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| CN201780095904.9A Pending CN111316524A (en) | 2017-10-13 | 2017-10-13 | Charging circuit for intelligent terminal and intelligent terminal with same |
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| WO (1) | WO2019071556A1 (en) |
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| WO2017161587A1 (en) * | 2016-03-25 | 2017-09-28 | 华为技术有限公司 | Power supply circuit for load, and terminal |
| CN105871188A (en) * | 2016-05-18 | 2016-08-17 | 青岛海信移动通信技术股份有限公司 | Surge protection circuit and mobile terminal |
| CN206412760U (en) * | 2017-01-25 | 2017-08-15 | 无锡天和电子有限公司 | A kind of anti-reverse voltage surge, spike and ripple protection circuit |
| CN107124024A (en) * | 2017-06-21 | 2017-09-01 | 歌尔科技有限公司 | A kind of battery management circuit of virtual reality device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019071556A1 (en) | 2019-04-18 |
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Application publication date: 20200619 |
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| RJ01 | Rejection of invention patent application after publication |