CN113258650A - Terminal charging system - Google Patents
Terminal charging system Download PDFInfo
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- CN113258650A CN113258650A CN202110683080.5A CN202110683080A CN113258650A CN 113258650 A CN113258650 A CN 113258650A CN 202110683080 A CN202110683080 A CN 202110683080A CN 113258650 A CN113258650 A CN 113258650A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a terminal charging system, which is characterized in that current signals output by an adapter are transmitted to terminal equipment in a matching way through charging interfaces at two ends of a charging wire, when the terminal equipment is charged, a first current detection circuit is used for collecting and converting output current signals of the adapter to obtain first voltage signals, a second current detection circuit is used for collecting and converting input current signals of the terminal equipment to obtain second voltage signals, and then the first voltage signals and the second voltage signals are compared to judge whether the terminal equipment has current change in the charging process; if the output of the first voltage comparison circuit is that the first voltage signal is higher than the second voltage signal and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value, current leakage is indicated, when the switch circuit detects the output, current transmission of a charging wire is turned off, and the charging wire is turned off when short-circuit leakage current generates heat to damage a charging interface, so that the heating original end is protected in advance, and the charging interface is prevented from being burnt.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a terminal charging system.
Background
Along with the continuous development of science and technology, more and more terminal equipment appears in the field of vision of the masses, changes the problem in order to solve terminal equipment's battery, and then has designed the charger that can charge for the battery, and this charger need not to take out the battery in the terminal equipment when using, can directly charge to terminal equipment.
Currently, a common charger, such as a wired charger, is connected to a terminal device through an adapter and a data line, so as to charge the terminal device. For example, almost all PDA devices in the market at present use TYPE C interfaces for charging, and implement high-power and fast charging through QC and PD protocols, and the fast charging power can reach 30W-100W or even higher.
However, there is a certain safety hazard when charging at such a high fast charging power. For example, when a conductive foreign matter enters the TYPE C port, a large current is generated after the VBUS end and the GND end are short-circuited, so that a large amount of heat is generated and the TYPE C port is burnt; in addition, the TYPE C interface is exposed to severe environments such as humidity and salt fog for a long time, the gold finger in the TYPE C interface is easy to oxidize, contact resistance is increased, and after contact impedance is increased, the contact resistance causes large voltage drop and simultaneously large current generates heat and can burn out the TYPE C interface.
Disclosure of Invention
The present invention is directed to solve at least one of the above technical defects, and particularly to a technical defect in the prior art that when a conductive foreign object enters the TYPE C port, a large current is generated after the VBUS terminal and the GND terminal are short-circuited, so that a large amount of heat is generated and the TYPE C port is burned.
The invention provides a terminal charging system, comprising: the charging line comprises a first current detection circuit, a second current detection circuit, a first voltage comparison circuit and a switch circuit;
the charging interfaces at two ends of the charging wire are respectively connected with an adapter and terminal equipment and are used for transmitting a current signal output by the adapter to the terminal equipment in a matching manner;
when the terminal equipment is charged, the signal acquisition end of the first current detection circuit acquires an output current signal of the adapter, converts the output current signal into a first voltage signal and inputs the first voltage signal to the first voltage comparison circuit, and the signal acquisition end of the second current detection circuit acquires an input current signal of the terminal equipment, converts the input current signal into a second voltage signal and inputs the second voltage signal to the first voltage comparison circuit;
the output end of the first voltage comparison circuit is connected with the control end of the switch circuit and used for comparing the first voltage signal with the second voltage signal to obtain a first comparison result and sending the first comparison result to the switch circuit;
the switch circuit is arranged on the charging wire and used for switching off current transmission of the charging wire when the first voltage signal is higher than the second voltage signal and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value.
Optionally, the first current detection circuit comprises a first current detection resistor and a first current monitor;
the first current detection resistor collects an output current signal of the adapter in real time and sends the output current signal to the first current monitor;
after receiving the output current signal, the first current monitor amplifies and converts the output current signal according to the resistance value of the first current detection resistor, the first preset amplification factor and the direct current bias voltage of the first current monitor, and sends a first voltage signal obtained after conversion to the first voltage comparison circuit.
Optionally, the first current detection resistor is connected in series with a VBUS terminal close to a charging interface of the adapter.
Optionally, the second current detection circuit comprises a second current detection resistor and a second current monitor;
the second current detection resistor collects an input current signal of the terminal equipment in real time and sends the input current signal to the second current monitor;
and after receiving the input current signal, the second current monitor amplifies and converts the input current signal according to the resistance value of the second current detection resistor, a second preset amplification factor and the direct-current bias voltage of the second current monitor, and sends a second voltage signal obtained after conversion to the first voltage comparison circuit.
Optionally, the second current detection resistor is connected in series with a VBUS terminal of the charging interface of the terminal device.
Optionally, the terminal charging system further includes a second voltage comparison circuit;
the second voltage comparison circuit is used for acquiring output voltage close to a charging interface of the terminal equipment and input voltage of the terminal equipment, comparing the output voltage with the input voltage to obtain a second comparison result, and sending the second comparison result to the switch circuit;
the switch circuit performs a wired-and logic operation on the first comparison result and the second comparison result, and controls current transmission of the charging wire based on the operation result.
Optionally, the second voltage comparison circuit comprises a differential amplifier and a voltage comparator;
the differential amplifier is used for carrying out difference on the output voltage and the input voltage and amplifying a voltage difference obtained after difference is carried out;
the voltage comparator is used for comparing the amplified voltage difference with the set impedance value voltage to obtain a second comparison result, and sending the second comparison result to the switch circuit.
Optionally, the switching circuit comprises an arithmetic circuit and a driving circuit;
the operation circuit is used for performing a wired AND operation on the first comparison result and the second comparison result to obtain an operation result, and sending the operation result to the drive circuit;
the driving circuit controls current transmission of the charging wire based on the operation result.
Optionally, the driving circuit includes a triode driving circuit and a MOS switch;
the triode driving circuit receives the operation result of the operation circuit, and drives the MOS switch to turn off the current transmission of the charging wire when a first voltage signal in the first comparison result is higher than a second voltage signal, and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value, or the amplified voltage difference in the second comparison result is higher than the set impedance value voltage.
Optionally, the switching circuit further comprises an indicator light;
the indicating lamp is used for collecting the switching state of the switching circuit and prompting when the switching state is off.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides a terminal charging system, which is characterized in that current signals output by an adapter are transmitted to terminal equipment in a matching way through charging interfaces at two ends of a charging wire, when the terminal equipment is charged, a first current detection circuit is used for collecting and converting output current signals of the adapter to obtain first voltage signals, a second current detection circuit is used for collecting and converting input current signals of the terminal equipment to obtain second voltage signals, and then the first voltage signals and the second voltage signals are compared to judge whether the terminal equipment has current change in the charging process; if the output of the first voltage comparison circuit is that the first voltage signal is higher than the second voltage signal and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value, current leakage is indicated, when the switch circuit detects the output, current transmission of a charging wire is turned off, and the charging wire is turned off when short-circuit leakage current generates heat to damage a charging interface, so that the heating original end is protected in advance, and the charging interface is prevented from being burnt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a terminal charging system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first (second) current detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a comparison structure of line end and board end sampling provided by the embodiment of the present invention;
FIG. 4 is a schematic diagram of a dual compare circuit line and logic structure according to an embodiment of the present invention;
fig. 5 is a schematic view of charge detection of the TYPE C charging interface according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Along with the continuous development of science and technology, more and more terminal equipment appears in the field of vision of the masses, changes the problem in order to solve terminal equipment's battery, and then has designed the charger that can charge for the battery, and this charger need not to take out the battery in the terminal equipment when using, can directly charge to terminal equipment.
Currently, a common charger, such as a wired charger, is connected to a terminal device through an adapter and a data line, so as to charge the terminal device. For example, almost all PDA devices in the market at present use TYPE C interfaces for charging, and implement high-power and fast charging through QC and PD protocols, and the fast charging power can reach 30W-100W or even higher.
However, there is a certain safety hazard when charging at such a high fast charging power. For example, when a conductive foreign matter enters the TYPE C port, a large current is generated after the VBUS end and the GND end are short-circuited, so that a large amount of heat is generated to burn the TYPE C port; in addition, the TYPE C interface is exposed to severe environments such as humidity and salt fog for a long time, the gold finger in the TYPE C interface is easy to oxidize, contact resistance is increased, and after contact impedance is increased, the contact resistance causes large voltage drop and simultaneously large current generates heat and can burn out the TYPE C interface.
Therefore, the invention aims to solve the technical problems that when conductive foreign matters enter the TYPE C port in the prior art, a large current is generated after the VBUS end and the GND end are short-circuited, so that a large amount of heat is generated and the TYPE C port is burnt, and provides the following technical scheme:
in an embodiment, as shown in fig. 1, fig. 1 is a schematic structural diagram of a terminal charging system according to an embodiment of the present invention; the invention provides a terminal charging system, which can comprise: the charging wire 20, the charging wire 20 may include a first current detecting circuit 60, a second current detecting circuit 70, a first voltage comparing circuit 50 and a switching circuit 40.
The charging interfaces at the two ends of the charging wire 20 are respectively connected with the adapter 10 and the terminal device 30, and are used for transmitting the current signal output by the adapter 10 to the terminal device 30 in a matching manner.
It is understood that the charging wire 20 herein refers to a data line with exposed metal pins of the charging interfaces at two ends, and the data line includes but is not limited to a USB a-TYPE C data line, a micro USB data line, etc.; the adapter 10 herein refers to an interface converter, which may be an independent hardware interface device, allowing the hardware or electronic interface to be connected with other hardware or electronic interfaces, or an information interface, such as a power adapter, a tripod base adapter, a USB and serial interface adapter, etc.; the terminal device 30 herein refers to a rechargeable device with a charging interface, which includes but is not limited to a handheld terminal device, a smart phone, a smart watch, and the like.
In the present application, the charging line 20 includes a first current detection circuit 60, a second current detection circuit 70, and a first voltage comparison circuit 50. When the terminal device 30 is charged, the signal acquisition end of the first current detection circuit 60 acquires an output current signal of the adapter 10, converts the output current signal into a first voltage signal, and inputs the first voltage signal to the first voltage comparison circuit 50, and the signal acquisition end of the second current detection circuit 70 acquires an input current signal of the terminal device 30, converts the input current signal into a second voltage signal, and inputs the second voltage signal to the first voltage comparison circuit 50.
It can be understood that, when the terminal device 30 needs to be charged, the adapter 10 may be connected to a dc or ac power source, and the adapter 10 converts a dc or ac signal in the dc or ac power source into an electrical signal matched with the terminal device 30 and then transmits the signal through the charging wire 20. And when the interface that charges, when the TYPE C interface has electrically conductive foreign matter to enter into, VBUS end produces the heavy current with GND end emergence short circuit after, and the heavy current produces a large amount of heats easily to burn out TYPE C interface.
For the above reasons, when the terminal device 30 is charged, the first current detection circuit 60 and the second current detection circuit 70 in the charging line 20 are used to collect the output current signal of the adapter 10 and the input current signal of the terminal device 30, respectively, and the change between the output current signal and the input current signal is monitored to determine whether the leakage current is generated.
It is understood that the leakage current herein refers to a difference between the output current signal of the adapter 10 and the input current signal of the terminal device 30. Normally, the difference between the output current signal of the adapter 10 and the input current signal of the terminal device 30 is kept within the allowable leakage current range, and if there is leakage during the transmission of the output current signal of the adapter 10 through the charging wire 20, the difference between the input current signal of the terminal device 30 and the output current signal of the adapter 10 exceeds the allowable leakage current range, and thus there is a possibility of burning out the TYPE C interface.
Further, in the present application, when determining whether a leakage current is generated, the output current signal of the adapter 10 may be converted into a first voltage signal, and after the input current signal of the terminal device 30 is converted into a second voltage signal, the first voltage comparison circuit 50 compares the magnitudes of the first voltage signal and the second voltage signal, and compares the difference between the two with a set threshold, thereby determining whether the leakage current is generated.
It should be understood that the set threshold herein refers to a voltage threshold corresponding to an allowable leakage current range, and when the first voltage signal and the second voltage signal are compared, if a difference between the two exceeds the set threshold, it indicates that the leakage current in the circuit at this time exceeds the allowable leakage current range, and then it is determined that the leakage current occurs.
For example, if the current detection resistor and the current monitor are used in the charging line 20 to respectively collect and convert the output current signal of the adapter 10 and the input current signal of the terminal device 30, two sets of current detection resistors with the same resistance value can be used to respectively collect the output current signal of the adapter 10 and the input current signal of the terminal device 30, and then the collected current is transmitted to the current monitor through the connection circuit to be amplified and converted, the two sets of current signals can be set to the same amplification factor, a dc bias voltage can be set in the current monitor, the dc bias voltage is an output voltage when the monitoring current is 0, and the dc bias voltage can be configured according to an allowable leakage current range in the configuration process, so as to avoid the first voltage comparison circuit 50 from generating a misjudgment situation.
When the current detection resistor is used to collect the output current signal of the adapter 10 and the input current signal of the terminal device 30, and the output current signal and the input current signal are amplified and converted by the current monitor, since the resistances of the two sets of current detection resistors are the same, the amplification times of the current monitor are the same, and the current monitor is provided with a dc bias voltage, that is, a leakage current range allowed to exist is set in the circuit.
Therefore, under normal conditions, if the first voltage signal is slightly higher than the second voltage signal, it indicates that the difference between the two signals corresponds to the allowable leakage current range, i.e. is within the set threshold range; if the output result of the first voltage comparing circuit 50 is that the first voltage is significantly higher than the second voltage, it indicates that the difference between the two is beyond the set threshold range, which indicates that the leakage current value in the circuit is beyond the allowable leakage current range at this time, and the leakage current is generated in the circuit.
Further, the charging line 20 in this application further includes a switch circuit 40, and an output terminal of the first voltage comparison circuit 50 is connected to a control terminal of the switch circuit 40, and mainly sends the first comparison result to the switch circuit 40. The switch circuit 40 is disposed on the charging line 20, and when the first comparison result of the first voltage comparison circuit 50 is that the first voltage signal is higher than the second voltage signal, and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold, the switch circuit 40 turns off the current transmission of the charging line 20, but not turns off when the short-circuit leakage current generates heat to damage the charging interface, so that the heating source is protected in advance, and the charging interface is prevented from being burnt.
The above-mentioned embodiment describes a terminal charging system of the present application, and the first current detection circuit 60 of the present application will be specifically described below.
In an embodiment, as shown in fig. 2, fig. 2 is a schematic structural diagram of a first (second) current detection circuit provided in an embodiment of the present invention; the first current sensing circuit 60 may include a first current sensing resistor and a first current monitor.
The first current detection resistor collects an output current signal of the adapter 10 in real time and sends the output current signal to the first current monitor; after receiving the output current signal, the first current monitor amplifies and converts the output current signal according to the resistance value of the first current detection resistor, the first preset amplification factor, and the dc bias voltage of the first current monitor, and sends the converted first voltage signal to the first voltage comparison circuit 50.
In this embodiment, as shown in fig. 2, when the first current detection circuit 60 collects the output current signal of the adapter 10, the first current detection resistor may be used to collect the output current signal in real time, and the first current detection resistor inputs the positive electrode and the negative electrode of the collected output current signal to the positive input end and the negative input end of the first current monitor respectively, so that the output current signal is amplified and converted by the first current monitor.
Specifically, the calculation formula when the first current monitor amplifies and converts the output current signal is as follows:
wherein the content of the first and second substances,
in order to amplify the converted output signal,
in order to detect the current flow, it is,
in the form of a resistor, the resistance of the resistor,
in order to be a magnification factor,
is a dc bias voltage.
And inputting the output current signal acquired by the first current detection resistor, the resistance value of the first current detection resistor, the first preset amplification factor and the direct current bias voltage of the first current monitor into the calculation formula to obtain the amplified and converted first voltage signal.
It is understood that the first current sensing resistor may be a milliohm-level current sensing resistor, which is typically within 20m Ω, and may be 10m Ω; the amplification factor here can be selected according to the series of the first current monitor, for example 50-500 times.
The above embodiment specifically describes the first current detection circuit 60 in the present application, and the position where the first current detection resistor is provided will be described below.
In one embodiment, the first current detection resistor is connected in series with the VBUS terminal near the charging interface of the adapter 10, where the charging interface near the adapter 10 may be a USB a interface.
The above-described embodiment explains the position where the first current detection resistor is provided, and the second current detection circuit 70 in the present application will be described in detail below.
In one embodiment, the second current sensing circuit 70 may include a second current sensing resistor and a second current monitor.
The second current detection resistor collects an input current signal of the terminal device 30 in real time and sends the input current signal to the second current monitor; after receiving the input current signal, the second current monitor amplifies and converts the input current signal according to the resistance value of the second current detection resistor, the second preset amplification factor, and the dc bias voltage of the second current monitor, and sends the converted second voltage signal to the first voltage comparison circuit 50.
In this embodiment, as shown in fig. 2, when the second current detection circuit 70 collects the input current signal of the terminal device 30, the second current detection resistor may be used to collect the input current signal in real time, and the second current detection resistor inputs the positive electrode and the negative electrode of the collected input current signal to the positive input end and the negative input end of the second current monitor respectively, so as to perform amplification and conversion on the output current signal through the second current monitor.
Specifically, the input current signal acquired by the second current detection resistor, the resistance value of the second current detection resistor, the second preset amplification factor, and the dc bias voltage of the second current monitor may be input into a calculation formula corresponding to the amplified and converted output signal, so as to obtain the amplified and converted first voltage signal.
It should be noted that the resistance value and the second preset amplification factor of the second current detection resistor herein may be determined according to the resistance value and the first preset amplification factor of the first current detection resistor, for example, the resistance value of the second current detection resistor is set to be the same as the resistance value of the first current detection resistor, and the second preset amplification factor is set to be the same as the first preset amplification factor; the dc bias voltage of the first current monitor and the dc bias voltage of the second current monitor may be different, and may be configured by a resistance value in the circuit, and may be adjusted according to an allowable leakage current value.
For example, the first voltage signal output by the first current detection circuit 60 may be a data line detection amplified voltage
The second voltage signal output by the second current detection circuit 70 may be a board-end detection amplified voltage
As shown in fig. 3, fig. 3 is a schematic diagram of a structure for comparing sampling at a line end and a board end according to an embodiment of the present invention; when the leakage current in the circuit reaches the allowable leakage current value, i.e. the set leakage current value
At this time, the process of the present invention,
but leakage current
Thus can obtain
Since A1 and A2 have the same selection, R1 and R2 have the same selection, when
When the value of 0 is taken out,
i.e. by
Can be adjusted according to the allowed leakage current value.
Further, the set leakage current value may be set to 200mA, and may be specifically set according to circuit parameters.
Further, here, when the first voltage signal and the second voltage signal are compared, a voltage comparator may be used, and positive and negative input terminals of the voltage comparator may be respectively connected to the board terminal detection amplification voltage and the data line detection amplification voltage, when the board terminal detection amplification voltage is smaller than the data line detection amplification voltage, it indicates that the leakage current in the circuit at this time exceeds the allowable leakage current value, and the output of the voltage comparator is a low level, and the low level is input to the switching circuit 40 at this time, so that the switching circuit 40 turns off the current transmission of the charging line 20.
The above-described embodiment describes the second current detection circuit 70 in the present application in detail, and a specific position of the second current detection resistor will be described below.
In one embodiment, the second current detection resistor is connected in series with the VBUS terminal of the charging interface of the terminal device 30.
In this embodiment, since the present application is mainly to pre-determine whether there is leakage current in the charging interface in advance based on the current change in the main circuit, after the first current detection circuit 60 detects the output current signal of the adapter 10, the second current detection circuit 70 may be used to detect the input current signal of the terminal device 30, and the input current signal of the terminal device 30 may be specifically detected by installing the second current detection resistor between the charging interface female connector of the terminal device 30 and the main board.
For example, when the TYPE C interface is used in the present application, a second current detection resistor may be connected in series between the VBUS terminal at the rear end of the TYPE C female socket corresponding to the terminal device 30 and the main board of the terminal device 30, and the second current detection resistor is used to detect the input current signal of the terminal device 30, and when the terminal device 30 is charged, the input current signal may be transmitted to the second current monitor through the a2/B2 pin of the TYPE C interface, so that the second current monitor outputs the second voltage signal.
The above embodiment describes a specific position of the second current detection resistor, and the second voltage comparison circuit of the terminal charging system will be described below.
In one embodiment, the terminal charging system may further include a second voltage comparison circuit.
The second voltage comparison circuit is configured to collect an output voltage close to a charging interface of the terminal device 30 and an input voltage of the terminal device 30, compare the output voltage with the input voltage to obtain a second comparison result, and send the second comparison result to the switch circuit 40.
The switch circuit 40 performs a wired-and logic operation on the first comparison result and the second comparison result, and controls current transmission of the charging wire 20 based on the operation result.
In this embodiment, when the interface that charges, like the TYPE C interface exposes under adverse circumstances such as humidity and salt fog for a long time, the golden finger in the TYPE C interface produces phenomenons such as oxidation easily, leads to contact resistance increase, and contact resistance increases the back, and contact resistance causes the big while heavy current of pressure drop to generate heat and also can burn out the TYPE C interface.
Therefore, the output voltage close to the charging interface of the terminal device 30 and the input voltage of the terminal device 30 can be acquired by the second voltage comparison circuit, the output voltage and the input voltage are compared to obtain a second comparison result, the second comparison result is sent to the switch circuit 40, so that the line and logic operation is carried out on the first comparison result and the second comparison result in the switch circuit 40, the current transmission of the charging line 20 is controlled based on the operation result, the charging system is closed in advance instead of being closed when the charging interface is damaged by heat generated by the increase of impedance, the heating original end is protected in advance, and the charging interface is prevented from being burnt.
The above embodiments are developed to describe the second voltage comparison circuit of the terminal charging system, and the components of the second voltage comparison circuit will be described in detail below.
In one embodiment, the second voltage comparison circuit may include a differential amplifier and a voltage comparator.
The differential amplifier is used for carrying out difference on the output voltage and the input voltage and amplifying a voltage difference obtained after difference is carried out; the voltage comparator is configured to compare the amplified voltage difference with the set impedance value voltage to obtain a second comparison result, and send the second comparison result to the switch circuit 40.
In this embodiment, the second voltage comparison circuit may use a differential amplifier to collect the output voltage close to the charging interface of the terminal device 30 and the input voltage of the terminal device 30, and amplify the voltage difference after subtracting the output voltage from the input voltage, then input the amplified voltage difference into the voltage comparator, compare the amplified voltage difference with a set impedance value through the voltage comparator, and finally send the second comparison result obtained through comparison to the switch circuit 40, so that the switch circuit 40 controls the current transmission of the charging line 20 through a line and a logic operation.
It can be understood that, since the present application mainly determines the magnitude of the contact impedance based on the voltage drop across the charging interface, the charging system is turned off in advance. Therefore, the differential amplifier not only needs to acquire the voltage on the charging line 20, i.e. the output voltage close to the charging interface of the terminal device 30, but also needs to acquire the input voltage of the terminal device 30, so as to calculate the voltage drop across the charging interface.
For example, when the TYPE C interface is used in the present application, the a11/B11 terminal at the rear end of the TYPE C mother socket corresponding to the terminal device 30 can output the input voltage of the terminal device 30, and when the terminal device 30 is charged, the input voltage can be transmitted back to the differential amplifier of the TYPE C data line through the a11/B11 pins of the TYPE C interface, so as to calculate the voltage drop across the charging interface through the differential amplifier.
It is understood that the voltage comparator may be a base voltage comparator, and may be selected according to circuit parameters.
The above embodiment describes the components of the second voltage comparison circuit in detail, and the components of the switch circuit 40 will be described in detail below.
In one embodiment, the switching circuit 40 may include an arithmetic circuit and a driving circuit.
The operation circuit is used for performing a wired AND operation on the first comparison result and the second comparison result to obtain an operation result, and sending the operation result to the drive circuit; the drive circuit controls the current transmission of the charging wire 20 based on the operation result.
In this embodiment, the switch circuit 40 may be composed of an arithmetic circuit and a driving circuit, the arithmetic circuit is mainly used for performing a line and operation on a first comparison result output by the first voltage comparison circuit 50 and a second comparison result output by the second voltage comparison circuit, so as to obtain an operation result, and the driving circuit receives the operation result and controls the current transmission of the charging wire 20 based on the operation result.
Schematically, as shown in fig. 4, fig. 4 is a schematic diagram of a dual comparison circuit line and a logic structure provided in the embodiment of the present invention; in fig. 4, the output of each comparator circuit is an OC gate, the output of the first voltage comparator circuit 50 is OC1, the output of the second voltage comparator circuit is OC2, and when a row and operation is performed, if one of the two is not satisfied, a low level is output, so that the driving circuit is prompted to turn off the current transmission of the charging line 20.
The above-described embodiment describes the components of the switch circuit 40, and the components of the drive circuit will be described in detail below.
In one embodiment, the driving circuit may include a triode driver circuit and a MOS switch.
The triode drive circuit receives the operation result of the operation circuit, and drives the MOS switch to turn off the current transmission of the charging wire 20 when a first voltage signal in the first comparison result is higher than a second voltage signal, and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value, or the amplified voltage difference in the second comparison result is higher than the set impedance value voltage.
In this embodiment, the driving circuit in the switch circuit 40 may be composed of a triode driving circuit and an MOS switch, and when the first voltage signal in the first voltage comparing circuit 50 is higher than the second voltage signal and the difference between the two signals exceeds a set threshold, it indicates that there is a leakage current in the circuit at this time, and the charging system needs to be turned off in advance to prevent the charging interface from being burnt; or when the amplified voltage difference in the second voltage comparison circuit is higher than the set impedance value voltage, it indicates that the contact impedance in the circuit is larger at this time, and the charging system needs to be shut down in advance, so as to prevent the charging interface from being burnt.
The above-described embodiment describes in detail a constituent part of the drive circuit, and another constituent part of the switch circuit 40 will be described below.
In one embodiment, the switching circuit 40 may further include an indicator light; the indicator light is used for acquiring the switching state of the switching circuit 40 and prompting when the switching state is off.
In this embodiment, as shown in fig. 4, the output of each comparison circuit is an OC gate, and when performing the line and operation, if one of the comparison circuits does not satisfy the condition, a low level is output to prompt the driving circuit to turn off the current transmission of the charging line 20, and at this time, the indicator light connected to the driving circuit sends a prompt to remind the user of paying attention when detecting that the driving circuit turns off the current transmission of the charging line 20.
The terminal charging system of the present application will be further described with an example, and schematically, as shown in fig. 5, fig. 5 is a schematic view of detecting charging of a TYPE C charging interface according to an embodiment of the present invention.
In fig. 5, a first current detection resistor is connected in series to a VBUS end of the charging wire 20 close to the charging interface of the adapter 10, and the first current detection resistor is connected to a first current monitor, mainly sending a detected output current signal of the adapter 10 to the first current monitor, so that the first current monitor amplifies the output current signal and converts the output current signal into a first voltage signal; be connected with second current detection resistance between female first rear end of TYPE C and the mainboard of machine inside, second current detection resistance passes through the A2/B2 pin of the public head of TYPE C with the input current signal of terminal equipment 30 who detects and passes back to the second current monitor in the TYPE C data line to make second current monitor amplify this input current signal and convert into the second voltage signal, first voltage comparator receives and compares behind first voltage signal and the second voltage signal, and transmit first comparison result to line and logical operation in.
Then, the differential amplifier is used to collect the voltage on the charging line 20, i.e. the output voltage close to the charging interface of the terminal device 30, and collect the input voltage of the terminal device 30, i.e. the input voltage returned to the TYPE C data line through the a11/B11 pin of the TYPE C interface, so as to calculate the voltage drop across the charging interface, and input the calculated voltage drop into the second voltage comparator, which compares the voltage drop with the voltage with the set impedance value, and transmits the second comparison result to the line and logic operation.
And performing linear and logical operation on the first comparison result and the second comparison result, outputting a low level if one comparison result does not meet the condition, and driving the triode to trigger the MOS switch to turn off the charging, so that the charging system is turned off in advance, and the charging system is not turned off until short-circuit leakage current or impedance is increased to generate heat to damage a charging interface, so that the charging interface is prevented from being burnt.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, the embodiments may be combined as needed, and the same and similar parts may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A terminal charging system, comprising: the charging line comprises a first current detection circuit, a second current detection circuit, a first voltage comparison circuit and a switch circuit;
the charging interfaces at two ends of the charging wire are respectively connected with an adapter and terminal equipment and are used for transmitting a current signal output by the adapter to the terminal equipment in a matching manner;
when the terminal equipment is charged, the signal acquisition end of the first current detection circuit acquires an output current signal of the adapter, converts the output current signal into a first voltage signal and inputs the first voltage signal to the first voltage comparison circuit, and the signal acquisition end of the second current detection circuit acquires an input current signal of the terminal equipment, converts the input current signal into a second voltage signal and inputs the second voltage signal to the first voltage comparison circuit;
the output end of the first voltage comparison circuit is connected with the control end of the switch circuit and used for comparing the first voltage signal with the second voltage signal to obtain a first comparison result and sending the first comparison result to the switch circuit;
the switch circuit is arranged on the charging wire and used for switching off current transmission of the charging wire when the first voltage signal is higher than the second voltage signal and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value.
2. The terminal charging system according to claim 1, wherein the first current detection circuit comprises a first current detection resistor and a first current monitor;
the first current detection resistor collects an output current signal of the adapter in real time and sends the output current signal to the first current monitor;
after receiving the output current signal, the first current monitor amplifies and converts the output current signal according to the resistance value of the first current detection resistor, the first preset amplification factor and the direct current bias voltage of the first current monitor, and sends a first voltage signal obtained after conversion to the first voltage comparison circuit.
3. The terminal charging system of claim 2, wherein the first current sense resistor is connected in series with a VBUS terminal near a charging interface of the adapter.
4. The terminal charging system according to claim 1, wherein the second current detection circuit includes a second current detection resistor and a second current monitor;
the second current detection resistor collects an input current signal of the terminal equipment in real time and sends the input current signal to the second current monitor;
and after receiving the input current signal, the second current monitor amplifies and converts the input current signal according to the resistance value of the second current detection resistor, a second preset amplification factor and the direct-current bias voltage of the second current monitor, and sends a second voltage signal obtained after conversion to the first voltage comparison circuit.
5. The terminal charging system according to claim 4, wherein the second current detection resistor is connected in series with a VBUS terminal of a charging interface of the terminal device.
6. The terminal charging system according to claim 1, further comprising a second voltage comparison circuit;
the second voltage comparison circuit is used for acquiring output voltage close to a charging interface of the terminal equipment and input voltage of the terminal equipment, comparing the output voltage with the input voltage to obtain a second comparison result, and sending the second comparison result to the switch circuit;
the switch circuit performs a wired-and logic operation on the first comparison result and the second comparison result, and controls current transmission of the charging wire based on the operation result.
7. The terminal charging system of claim 6, wherein the second voltage comparison circuit comprises a differential amplifier and a voltage comparator;
the differential amplifier is used for carrying out difference on the output voltage and the input voltage and amplifying a voltage difference obtained after difference is carried out;
the voltage comparator is used for comparing the amplified voltage difference with the set impedance value voltage to obtain a second comparison result, and sending the second comparison result to the switch circuit.
8. The terminal charging system according to claim 7, wherein the switching circuit includes an arithmetic circuit and a driving circuit;
the operation circuit is used for performing a wired AND operation on the first comparison result and the second comparison result to obtain an operation result, and sending the operation result to the drive circuit;
the driving circuit controls current transmission of the charging wire based on the operation result.
9. The terminal charging system according to claim 8, wherein the driving circuit comprises a triode driving circuit and a MOS switch;
the triode driving circuit receives the operation result of the operation circuit, and drives the MOS switch to turn off the current transmission of the charging wire when a first voltage signal in the first comparison result is higher than a second voltage signal, and the difference value between the first voltage signal and the second voltage signal exceeds a set threshold value, or the amplified voltage difference in the second comparison result is higher than the set impedance value voltage.
10. The terminal charging system of claim 1, wherein the switching circuit further comprises an indicator light;
the indicating lamp is used for collecting the switching state of the switching circuit and prompting when the switching state is off.
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| CN202110683080.5A CN113258650B (en) | 2021-06-21 | 2021-06-21 | Terminal charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779118A (en) * | 2022-04-20 | 2022-07-22 | 中国第一汽车股份有限公司 | Electric leakage detection device, electric leakage detection method and automobile charging equipment |
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| CN106374577A (en) * | 2016-10-21 | 2017-02-01 | 努比亚技术有限公司 | Charging protection method and device |
| CN207124471U (en) * | 2017-08-14 | 2018-03-20 | 维沃移动通信有限公司 | A kind of charge control apparatus |
| CN212162244U (en) * | 2020-11-09 | 2020-12-15 | 江苏东大集成电路系统工程技术有限公司 | Type C interface data line with detect and short-circuit protection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106374577A (en) * | 2016-10-21 | 2017-02-01 | 努比亚技术有限公司 | Charging protection method and device |
| CN207124471U (en) * | 2017-08-14 | 2018-03-20 | 维沃移动通信有限公司 | A kind of charge control apparatus |
| CN212162244U (en) * | 2020-11-09 | 2020-12-15 | 江苏东大集成电路系统工程技术有限公司 | Type C interface data line with detect and short-circuit protection function |
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| CN114779118A (en) * | 2022-04-20 | 2022-07-22 | 中国第一汽车股份有限公司 | Electric leakage detection device, electric leakage detection method and automobile charging equipment |
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Address after: No.15 Xinghuo Road, Jiangbei new district, Nanjing, Jiangsu Province, 210031 Patentee after: Dongji Technology Co.,Ltd. Address before: No. 15, Xinghuo Road, Jiangbei new district, Nanjing, Jiangsu 210000 Patentee before: JIANGSU SEUIC TECHNOLOGY Co.,Ltd. |