CN115411814A - Charging device with automatic voltage compensation function and flat panel equipment - Google Patents
Charging device with automatic voltage compensation function and flat panel equipment Download PDFInfo
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- CN115411814A CN115411814A CN202211070384.5A CN202211070384A CN115411814A CN 115411814 A CN115411814 A CN 115411814A CN 202211070384 A CN202211070384 A CN 202211070384A CN 115411814 A CN115411814 A CN 115411814A
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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
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging device and a flat panel device with automatic voltage compensation, wherein the charging device comprises: the output end of the charging circuit is connected with the input end of the Type-C interface and is used for outputting charging voltage to the input end of the Type-C interface; the charging controller is connected with the output end of the charging circuit and the Type-C interface output end respectively, and is used for detecting the output voltage of the charging circuit, the output current of the charging circuit and the voltage of the Type-C interface output end, and outputting the compensation voltage to the Type-C interface input end by the voltage control voltage compensation circuit according to the output voltage and the output current of the charging circuit, or the output voltage of the charging circuit and the voltage of the Type-C interface output end, so as to compensate the charging voltage. The invention solves the problem that the line loss voltage generated by Type-C line transmission influences the external charging efficiency of the charging device.
Description
Technical Field
The invention relates to the field of charging, in particular to a charging device with automatic voltage compensation and a flat panel device.
Background
Type-C is becoming a standard interface of various electronic products, such as a display, a mobile phone, a tablet, and a notebook computer, due to its powerful electrical performance specification and convenience.
In the process that charging current is output to external equipment through a Type-C line, because the Type-C line has internal resistance, the current can generate corresponding line loss voltage through transmission of the Type-C line, and the voltage received by the external equipment is caused to receive loss. When the charging current is large (for example, when the PD charges the external device, the charging current may reach 4.5A), or when the Type-C line is long, a large line loss voltage is generated on the Type-C line, which causes a low voltage received by the external device, and affects the efficiency of the charging device for charging the external device.
Disclosure of Invention
The invention mainly aims to provide a charging device with automatic voltage compensation and a flat panel device, aiming at solving the problem that the line loss voltage generated by Type-C line transmission influences the external charging efficiency of the charging device.
In order to achieve the above object, the present invention provides a charging device with automatic voltage compensation, comprising:
the device comprises a Type-C interface input end and a Type-C interface output end, wherein the Type-C interface output end is used for connecting an external load;
the output end of the charging circuit is connected with the Type-C interface input end, and the charging circuit is used for outputting charging voltage to the Type-C interface input end;
the charging controller is respectively connected with the output end of the charging circuit and the Type-C interface output end, and is used for detecting the output voltage of the charging circuit, the output current of the charging circuit and the voltage of the Type-C interface output end and outputting a corresponding voltage compensation control signal according to the output voltage of the charging circuit and the output current of the charging circuit or the output voltage of the charging circuit and the voltage of the Type-C interface output end;
the controlled end of the voltage compensation circuit is connected with the charging controller, the output end of the voltage compensation circuit is connected with the output end of the charging circuit, and the voltage compensation circuit is used for outputting corresponding compensation voltage to the Type-C interface input end according to the voltage compensation control signal so as to compensate the output voltage of the charging circuit.
Optionally, the charging controller is specifically configured to output a corresponding voltage compensation control signal according to the output current of the charging circuit and the first compensation impedance when the output voltage of the charging circuit is smaller than a first voltage threshold;
when the output voltage of the charging circuit is greater than or equal to a first voltage threshold and less than a second voltage threshold, outputting a corresponding voltage compensation control signal according to the output current of the charging circuit and a second compensation impedance;
and when the output voltage of the charging circuit is greater than or equal to a second voltage threshold value, outputting a corresponding voltage compensation control signal according to the output voltage of the charging circuit and the voltage of the Type-C interface output end.
Optionally, the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ia Ra when the output voltage of the charging circuit is smaller than a first voltage threshold, where Ia is the output current of the charging circuit and Ra is the first compensation impedance.
Optionally, the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ia Rb when the output voltage of the charging circuit is greater than or equal to a first voltage threshold and less than a second voltage threshold, where Ia is the output current of the charging circuit, and Rb is a second compensation impedance.
Optionally, the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ub-Ua when the output voltage of the charging circuit is greater than or equal to the second voltage threshold, where Ua is the output voltage of the charging circuit, and Ub is the output voltage of the Type-C interface.
Optionally, the charging controller is further configured to detect a temperature of the Type-C interface input end, and adjust the compensation voltage output by the voltage compensation circuit according to the temperature of the Type-C interface input end.
Optionally, the voltage compensation circuit includes a switch tube, an input end of the switch tube is connected to a power supply end, a controlled end of the switch tube is connected to an output end of the charging controller, an output end of the switch tube is connected to the Type-C interface input end, and the charging controller is specifically configured to control on/off of the switch tube.
Optionally, the voltage compensation circuit further comprises a filter circuit, the filter circuit is serially connected between the output end of the switch tube and the Type-C interface input end, and the filter circuit is configured to filter the output voltage of the switch tube and output the filtered output voltage to the Type-C interface input end.
Optionally, the compensation voltage output by the voltage compensation circuit is lower than 5% of the voltage at the output end of the Type-C interface.
The invention provides a flat panel device, which comprises the charging device with the automatic voltage compensation function.
The charging device with automatic voltage compensation comprises a Type-C interface input end, a Type-C interface output end, a charging circuit, a charging controller and a voltage compensation circuit. The charging control device comprises a charging circuit, a charging controller, a voltage compensation circuit, a Type-C interface output end, a Type-C interface input end, a charging controller and a controlled end, wherein the Type-C interface output end is used for connecting an external load, the output end of the charging circuit is connected with the Type-C interface input end, the charging controller is respectively connected with the output end of the charging circuit and the Type-C interface output end, the controlled end of the voltage compensation circuit is connected with the charging controller, and the output end of the voltage compensation circuit is connected with the output end of the charging circuit. Charging circuit is used for exporting corresponding charging voltage to Type-C interface input end, charging controller is used for detecting charging circuit's output voltage, charging circuit's output current and Type-C interface output end's voltage, and according to charging circuit's output voltage and charging circuit's output current, or charging circuit's output voltage and Type-C interface output end's voltage output corresponding voltage compensation control signal, voltage compensation circuit is used for according to voltage compensation control signal output corresponding compensation voltage to Type-C interface input end, in order to compensate charging circuit's output voltage. When the charging circuit is in constant current output, the charging controller acquires the line loss voltage of the Type-C interface according to the output current of the charging circuit; when the charging circuit is in constant voltage output, the charging controller acquires the line loss voltage of the Type-C interface according to the output voltage of the Type-C interface, and the charging controller controls the voltage compensation circuit to output the line loss voltage of the Type-C interface and compensate the output voltage of the charging circuit, so that the voltage output to an external load is consistent with the output voltage of the charging circuit.
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, 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 the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an automatic voltage compensation charging device according to the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of an automatic voltage compensation charging device according to the present invention;
FIG. 3 is a schematic diagram showing the charging current-time and charging voltage-time of the charging device with automatic voltage compensation according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | |
| 30 | |
41 | Type-C |
| 42 | Type-C interface output end | K1 | Switch tube |
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
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 obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a charging device with automatic voltage compensation, which is used for carrying out voltage compensation on voltage output by the charging device aiming at line loss voltage generated by a Type-C line so as to meet the power supply requirement of external equipment.
In the process that charging current is output to external equipment through a Type-C line, because the Type-C line has internal resistance, the current can generate corresponding line loss voltage through transmission of the Type-C line, and the voltage received by the external equipment is caused to receive loss. When the charging current is large (for example, when PD charges externally, the charging current may reach 4.5A), or when TYPE-C line is long, the TYPE-C line may generate a large line loss voltage, which causes the voltage received by the external device to become low, and affects the efficiency of charging externally by the charging device.
Referring to fig. 1, in an embodiment of the present invention, the automatic voltage compensation charging apparatus includes:
the interface comprises a Type-C interface input end 41 and a Type-C interface output end 42, wherein the Type-C interface output end 42 is used for connecting an external load;
the output end of the charging circuit 10 is connected to the Type-C interface input end 41, and the charging circuit 10 is configured to output a charging voltage to the Type-C interface input end 41;
the charging controller 20 is connected to the output end of the charging circuit 10 and the Type-C interface output end 42, and the charging controller 20 is configured to detect an output voltage of the charging circuit 10, an output current of the charging circuit 10, and a voltage of the Type-C interface output end 42, and output a corresponding voltage compensation control signal according to the output voltage of the charging circuit 10 and the output current of the charging circuit 10, or the output voltage of the charging circuit 10 and the voltage of the Type-C interface output end 42;
the controlled end of the voltage compensation circuit 30 is connected to the charging controller 20, the output end of the voltage compensation circuit 30 is connected to the output end of the charging circuit 10, and the voltage compensation circuit 30 is configured to output a corresponding compensation voltage to the Type-C interface input end 41 according to the voltage compensation control signal so as to compensate the output voltage of the charging circuit 10.
In this embodiment, the Type-C interface is a charging port of the charging apparatus, and is used for supplying power to the external device. Because the Type-C interface has internal resistance, a voltage drop exists between the input end and the output end of the Type-C interface, so that the voltage provided by the Type-C interface output end 42 to the external device is lower than the voltage provided by the charging circuit 10 to the Type-C interface input end 41.
When the charging circuit 10 outputs a constant current, since the output voltage of the charging circuit 10 is constantly changing, it is difficult to directly obtain the line loss voltage of the Type-C interface. Since the current output by the charging circuit 10 is constant, the line loss voltage of the Type-C interface can be calculated from the output current of the charging circuit 10. Assuming that the current flowing through the Type-C interface is Ia and the value of the impedance R0 of the Type-C interface is known, the line loss voltage of the Type-C interface can be calculated as Ia × R0. When the charging circuit 10 outputs a constant current, the charging controller 20 controls the voltage compensation circuit 30 to output a compensation voltage Ia × R0.
When the charging circuit 10 is in the constant voltage charging stage, the output voltage Ua of the charging circuit 10 can be directly obtained, and the line loss voltage of the Type-C interface is directly obtained as Ua-Ub through the voltage drop between the output voltage Ua of the charging circuit 10 and the voltage Ub of the Type-C interface output end 42. When the charging circuit 10 outputs a constant voltage, the charging controller 20 controls the voltage compensation circuit 30 to output a compensation voltage Ua-Ub.
The charging controller 20 in this embodiment can determine the constant current output or the constant voltage output of the charging circuit 10 according to the output voltage of the charging circuit 10, and calculate the line loss voltage of the Type-C interface corresponding to different charging stages of the charging circuit 10. After the line loss voltage of the Type-C interface is calculated, the control voltage compensation circuit 30 outputs the line loss voltage calculated by the charging controller 20 as a compensation voltage to compensate the output voltage of the charging circuit 10, so that the voltage of the output end 42 of the Type-C interface is consistent with the output voltage of the charging circuit 10.
There is also a commonly used voltage compensation scheme, in which a fixed slightly higher voltage output is set in the charging circuit 10, for example, the 5V output is changed to 5.3V output, so that the actual voltage obtained at the terminal is increased by 0.3V no matter how much line loss voltage is transmitted by the Type-C line. One disadvantage of this solution is that when the terminal is under light load (low current 0A/0.1A/0.2A \8230;), the voltage actually obtained by the terminal is also relatively high, 53V (not 50V); because under the condition of small current, the line loss voltage caused by the Type-C line is also small. This "high voltage" can be a high voltage hazard for some terminal equipment requiring very precise voltages.
The embodiment can adjust the value of the compensation voltage in real time according to different working phases of the charging circuit, so that the output compensation voltage is more accurate. Compared with the technical scheme of the compensation voltage, the embodiment avoids the problem that when the terminal is in light load, the voltage output by the Type-C port is too high to cause equipment damage.
The charging device with automatic voltage compensation comprises a Type-C interface input end 41, a Type-C interface output end 42, a charging circuit 10, a charging controller 20 and a voltage compensation circuit 30. Wherein, type-C interface output 42 is used for connecting external load, and charging circuit 10's output is connected with Type-C interface input 41, charging controller 20 respectively with charging circuit 10's output and Type-C interface output 42 are connected, and voltage compensation circuit 30's controlled end is connected with charging controller 20, and voltage compensation circuit 30's output is connected with charging circuit 10's output. The charging controller 20 is configured to detect an output voltage of the charging circuit 10, an output current of the charging circuit 10, and a voltage of the Type-C interface output end 42, and output a corresponding voltage compensation control signal according to the output voltage of the charging circuit 10 and the output current of the charging circuit 10, or the output voltage of the charging circuit 10 and the voltage of the Type-C interface output end 42, and the voltage compensation circuit 30 is configured to output a corresponding compensation voltage to the Type-C interface input end 41 according to the voltage compensation control signal, so as to compensate the output voltage of the charging circuit 10. When the charging circuit 10 is in constant-current output, the charging controller 20 obtains the line loss voltage of the Type-C interface according to the output current of the charging circuit 10; when the charging circuit 10 is in constant voltage output, the charging controller 20 obtains the line loss voltage of the Type-C interface according to the output voltage of the Type-C interface, the charging controller 20 controls the voltage compensation circuit 30 to output the line loss voltage of the Type-C interface, and compensates the output voltage of the charging circuit 10, so that the voltage output to an external load is consistent with the output voltage of the charging circuit 10.
In an embodiment of the present invention, the charging controller 20 is specifically configured to output a corresponding voltage compensation control signal according to the output current of the charging circuit 10 and a first compensation impedance when the output voltage of the charging circuit 10 is smaller than a first voltage threshold;
when the output voltage of the charging circuit 10 is greater than or equal to the first voltage threshold and less than the second voltage threshold, outputting a corresponding voltage compensation control signal according to the output current of the charging circuit 10 and the second compensation impedance;
and when the output voltage of the charging circuit 10 is greater than or equal to a second voltage threshold, outputting a corresponding voltage compensation control signal according to the output voltage of the charging circuit 10 and the output voltage of the Type-C interface.
In the present embodiment, the charging circuit 10 has three stages, which are a trickle charging stage, a constant current charging stage, and a constant voltage charging stage. The charging circuit 10 has a constant output current in the trickle charging stage and the constant current charging stage, and has a constant output voltage in the constant voltage charging stage.
Referring to fig. 3, the output voltage Ua of the charging circuit 10 is larger in the charging process, and when Ua is smaller than the first voltage threshold U1, the charging circuit 10 is in the trickle charging phase; when Ua is greater than or equal to the first voltage threshold U1 and less than the second voltage threshold U2, the charging circuit 10 is in a constant current charging stage; when Ua is greater than the second voltage threshold U2, the charging circuit 10 is in a constant voltage charging phase.
In the trickle charging phase or the constant current charging phase, the output current of the charging circuit 10 is constant, and the charging controller 20 calculates the line loss voltage of the Type-C interface through the output current of the charging circuit 10 and the impedance of the Type-C interface. Because the charging circuits of the charging circuit 10 in the trickle charging stage and the constant-current charging stage are different, the impedances of the Type-C interfaces in the trickle charging stage and the constant-current charging stage are different.
In an embodiment of the invention, the charging controller 20 is specifically configured to control the voltage compensation circuit 30 to output a compensation voltage Ia Ra when the output voltage of the charging circuit 10 is smaller than a first voltage threshold, where Ia is the output current of the charging circuit 10 and Ra is a first compensation impedance.
In this embodiment, when the charging circuit 10 is in the trickle charging phase, the impedance generated by the Type-C interface is Ra, and the voltage drop across the Type-C interface is Ia Ra.
When the charging controller 20 detects that the output voltage of the charging circuit 10 is smaller than the first voltage threshold U1, it determines that the charging circuit 10 is in the trickle charging stage, and controls the voltage compensation circuit 30 to output the compensation voltage Ia Ra to the Type-C interface input terminal 41 to eliminate the voltage drop across the Type-C interface, so that the voltage at the Type-C interface output terminal 42 is consistent with the output voltage of the charging circuit 10.
In an embodiment of the invention, the charging controller 20 is specifically configured to control the voltage compensation circuit 30 to output a compensation voltage Ia × Rb when the output voltage of the charging circuit 10 is greater than or equal to a first voltage threshold and less than a second voltage threshold, where Ia is an output current of the charging circuit 10, and Rb is a second compensation impedance.
In this embodiment, during the constant current charging phase of the charging circuit 10, the impedance generated by the Type-C interface is Rb, and the voltage drop across the Type-C interface is Ia Rb.
When the charging controller 20 detects that the output voltage of the charging circuit 10 is greater than or equal to the first voltage threshold U1 and less than the second voltage threshold U2, it determines that the charging circuit 10 is in the trickle charging stage, and controls the voltage compensation circuit 30 to output the compensation voltage of Ia Rb to the Type-C interface input terminal 41 to eliminate the voltage drop across the Type-C interface, so that the voltage at the Type-C interface output terminal 42 is consistent with the output voltage of the charging circuit 10.
In an embodiment of the present invention, the charging controller 20 is specifically configured to control the voltage compensation circuit 30 to output the compensation voltage Ub-Ua when the output voltage of the charging circuit 10 is greater than or equal to the second voltage threshold, where Ua is the output voltage of the charging circuit 10, and Ub is the output voltage of the Type-C interface.
In this embodiment, when the charging voltage rises to the second voltage threshold U2, the constant current charging is ended and the constant voltage charging phase is started. The charging current is slowly decreased from the maximum value while the charging voltage is maintained at the second voltage threshold U2.
When the charging circuit 10 is in the constant voltage charging stage, because the output voltage of the charging circuit 10 is constant, the line loss voltage of the Type-C interface can be directly obtained as Ua-Ub by detecting the output voltage Ub of the Type-C interface, and the charging controller 20 controls the voltage compensation circuit 30 to output the compensation voltage as Ua-Ub, so that the final output voltage of the Type-C interface is Ua and is consistent with the output voltage Ua of the charging circuit 10.
In an embodiment of the present invention, the charging controller 20 is further configured to detect a temperature of the Type-C interface, and adjust the compensation voltage output by the voltage compensation circuit 30 according to the temperature of the input terminal 41 of the Type-C interface.
In this embodiment, the temperature at the input 41 of the Type-C interface affects the internal impedance of the Type-C interface, and thus the voltage drop across the Type-C interface. If the temperature of the input terminal 41 of the Type-C interface causes the voltage drop at the two ends of the Type-C interface to increase, the charging controller 20 controls the compensation voltage output by the voltage compensation circuit 30 to increase to compensate the line loss voltage of the Type-C interface.
Referring to fig. 2, in an embodiment of the present invention, the voltage compensation circuit 30 includes a switching tube K1, an input end of the switching tube K1 is connected to a power supply end, a controlled end of the switching tube K1 is connected to an output end of the charging controller 20, an output end of the switching tube K1 is connected to the Type-C interface input end 41, and the charging controller 20 is specifically configured to control on/off of the switching tube K1.
In the present embodiment, the charging controller 20 controls the on/off of the switch tube K1 by outputting the PWM signal to control the compensation voltage of the power source terminal connected to the Type-C interface input terminal 41. The power end is used for receiving stable voltage, and can adopt LDO voltage regulation chip, and devices such as battery that can output stable voltage to the power end.
In order to increase the charging speed of the charging device adopting the USB interface, the voltage and current output by the charging circuit need to follow the corresponding USB-PD fast charging protocol. The charging circuit 10 is internally provided with a corresponding PD protocol chip, the output voltage of the charging circuit is often output by a standard voltage corresponding to the PD protocol, and the standard design values are 5V/3A, 12V/3A, 15V/3A and 20V/4.5A by taking a conventional 90W PD charger as an example. If the output voltage of the charging circuit 10 is to be directly adjusted, the charging protocol inside the PD protocol chip needs to be changed, which is difficult to be implemented in the actual working process. Therefore, in this embodiment, the compensation voltage is applied to the Type-C interface input terminal 41 through the power supply terminal to compensate the output voltage of the charging circuit 10.
The DC-DC converter can be used for outputting PWM signals to control the on/off of the switch tube K1, and the switch tube K1 can be an electronic switch such as an MOS tube, a triode, a field effect tube and the like.
In an embodiment of the present invention, the voltage compensation circuit 30 further includes a filter circuit, the filter circuit is serially connected between the output end of the switch tube K1 and the Type-C interface input end 41, and the filter circuit is configured to filter the output voltage of the switch tube K1 and output the filtered output voltage to the Type-C interface input end 41.
Referring to fig. 2, in this embodiment, the filter circuit includes a filter capacitor and a filter inductor, the output terminal of the switch tube K1 is connected to the first terminal of the filter inductor, the second terminal of the filter inductor and the first terminal of the filter capacitor are connected to be interconnected with the Type-C interface input terminal 41, and the second terminal of the filter capacitor.
In an embodiment of the present invention, the compensation voltage output by the voltage compensation circuit 30 is lower than 5% of the output voltage of the Type-C interface.
In the present embodiment, the compensation voltage output by the voltage compensation circuit 30 is typically lower than 5% of the output voltage of the Type-C interface.
Taking a conventional 90W PD charger as an example, the standard design values are 5V/3A, 12V/3A, 15V/3A and 20V/4.5A. Assuming that the line loss of the Type-C line is 0.1V/A, when the current is output to 0-1A, the voltage drop of 0-0.1V is generated by the conducting wire, and the influence on the output voltage is small, so that the conversion voltage VBUS does not need to be adjusted; when the current is output by 1-2A, the lead can generate 0.1-0.2V voltage drop, and the value of the conversion voltage VBUS needs to be increased by 2% -3%; when the current is output by 2-3A, the lead can generate 0.2-0.3V voltage drop, and the value of the conversion voltage VBUS needs to be increased by 3% -5%; when the output current is above 3A, the value of the conversion voltage VBUS is increased by 5%.
The invention provides a flat panel device, which comprises the charging device with the automatic voltage compensation function.
The detailed structure of the charging device can refer to the above embodiments, and is not described herein again; it can be understood that, because the charging device is used in the tablet device of the present invention, the embodiment of the tablet device of the present invention includes all technical solutions of all embodiments of the charging detection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An automatic voltage compensation charging device, comprising:
the device comprises a Type-C interface input end and a Type-C interface output end, wherein the Type-C interface output end is used for connecting an external load;
the output end of the charging circuit is connected with the Type-C interface input end, and the charging circuit is used for outputting charging voltage to the Type-C interface input end;
the charging controller is respectively connected with the output end of the charging circuit and the Type-C interface output end, and is used for detecting the output voltage of the charging circuit, the output current of the charging circuit and the voltage of the Type-C interface output end and outputting a corresponding voltage compensation control signal according to the output voltage of the charging circuit and the output current of the charging circuit or the output voltage of the charging circuit and the voltage of the Type-C interface output end;
the controlled end of the voltage compensation circuit is connected with the charging controller, the output end of the voltage compensation circuit is connected with the output end of the charging circuit, and the voltage compensation circuit is used for outputting corresponding compensation voltage to the Type-C interface input end according to the voltage compensation control signal so as to compensate the output voltage of the charging circuit.
2. The automatic voltage compensation charging device of claim 1, wherein the charging controller is specifically configured to output a corresponding voltage compensation control signal according to the output current of the charging circuit and a first compensation impedance when the output voltage of the charging circuit is less than a first voltage threshold;
when the output voltage of the charging circuit is greater than or equal to a first voltage threshold and less than a second voltage threshold, outputting a corresponding voltage compensation control signal according to the output current of the charging circuit and a second compensation impedance;
and when the output voltage of the charging circuit is greater than or equal to a second voltage threshold value, outputting a corresponding voltage compensation control signal according to the output voltage of the charging circuit and the voltage of the Type-C interface output end.
3. The automatic voltage compensation charging device of claim 2, wherein the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ia Ra when the output voltage of the charging circuit is smaller than a first voltage threshold, wherein Ia is the output current of the charging circuit, and Ra is a first compensation impedance.
4. The automatic voltage compensation charging device of claim 2, wherein the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ia Rb when the output voltage of the charging circuit is greater than or equal to a first voltage threshold and less than a second voltage threshold, wherein Ia is the output current of the charging circuit and Rb is a second compensation impedance.
5. The automatic voltage compensation charging device of claim 2, wherein the charging controller is specifically configured to control the voltage compensation circuit to output a compensation voltage Ub-Ua when the output voltage of the charging circuit is greater than or equal to the second voltage threshold, where Ua is the output voltage of the charging circuit and Ub is the output voltage of the Type-C interface.
6. The automatic voltage compensation charging device of claim 1, wherein the charging controller is further configured to detect a temperature of the Type-C interface input and adjust the compensation voltage output by the voltage compensation circuit according to the temperature of the Type-C interface input.
7. The automatic voltage compensation charging device according to claim 1, wherein the voltage compensation circuit comprises a switching tube, an input terminal of the switching tube is connected to a power supply terminal, a controlled terminal of the switching tube is connected to an output terminal of the charging controller, an output terminal of the switching tube is connected to the Type-C interface input terminal, and the charging controller is specifically configured to control on/off of the switching tube.
8. The automatic voltage compensation charging device according to claim 7, wherein the voltage compensation circuit further comprises a filter circuit, the filter circuit is serially connected between the output terminal of the switching tube and the Type-C interface input terminal, and the filter circuit is configured to filter the output voltage of the switching tube and output the filtered output voltage to the Type-C interface input terminal.
9. The automatic voltage compensation charging device of claim 1, wherein the voltage compensation circuit outputs a compensation voltage that is less than 5% of the voltage at the output of the Type-C interface.
10. A tablet device, characterized in that it comprises an automatic voltage compensation charging apparatus according to any one of claims 1 to 9.
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