CN216390547U - PD charging circuit capable of automatically compensating line loss - Google Patents
PD charging circuit capable of automatically compensating line loss Download PDFInfo
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- CN216390547U CN216390547U CN202122185091.9U CN202122185091U CN216390547U CN 216390547 U CN216390547 U CN 216390547U CN 202122185091 U CN202122185091 U CN 202122185091U CN 216390547 U CN216390547 U CN 216390547U
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Abstract
The utility model relates to a PD charging circuit capable of automatically compensating line loss, which comprises a Type C interface, a PD protocol chip and a PD power supply conversion module; the input voltage Vin is input into the PD power conversion module, the PD power conversion module performs voltage conversion on the input voltage Vin, the converted voltage VBUS is output after filtering, the voltage of the converted voltage VBUS passing through a lead is the post-line output voltage Vo, the post-line output voltage Vo is provided for the powered device, due to parasitic resistance R2 of the lead, voltage drop is generated between the converted voltage VBUS and the post-line output voltage Vo, the DC-DC conversion chip detects the current of the powered device in real time through the current detection amplification unit, the preset interval where the current value is located is obtained, the voltage of the converted voltage VBUS is adjusted to be the voltage corresponding to the current preset interval, and therefore the post-line output voltage Vo reaches the set value and is output to the TYPE C interface through the lead.
Description
Technical Field
The utility model relates to the technical field of direct current charging, in particular to a PD charging circuit capable of automatically compensating line loss.
Background
TYPE C is becoming a standard interface of various electronic products, such as a display, a mobile phone, a tablet, a notebook computer and a power adapter, due to its strong electrical performance specification and convenience of use, and the PD charging function is a core parameter in each performance specification of TYPE C.
Because the current that PD charges to the outside is great (standard upper limit is 100W), the line loss voltage is also very big after the heavy current passes through Type C line transmission, especially when Type C line is longer. Resulting in a lower voltage to the end terminal and even below the minimum voltage specification of the end terminal. It is a matter of design for the designer how to increase the actual voltage obtained at the termination.
Line loss voltage is the transmission current and the direct current impedance of the wire. The direct current impedance of the wire is only determined by the raw material/shape (including diameter)/length of the wire, namely the wire is basically not changed after leaving the factory, and the line loss voltage is determined by the transmission current.
The currently common methods for reducing the line loss are three methods (a) reducing the length of the TYPE C line, which is inconvenient to use under the large-size (volume) product; (b) changing the material of the transmission line: if a better and smaller impedance wire is used, the copper wire is replaced by a silver wire or a gold wire, which increases the cost of TYPE C; or thicker wires, which also increases the cost of TYPE C, and the diameter increases by a limited amount, too thick to be welded to a standard TYPE C interface. (c) PD is set to a fixed slightly higher voltage output, for example, 5V output to 5.3V output, then the actual voltage at the termination is increased by 0.3V no matter how much line loss voltage is transmitted by TYPE C line. A disadvantage of this solution is that the voltage actually obtained by the terminal is also relatively high 5.3V (not 5.0V) at light load (low current 0A/0.1A/0.2a …): because under the condition of low 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.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a PD charging circuit capable of automatically compensating for line loss, which overcomes the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the charging device capable of automatically compensating the line loss is constructed and comprises a Type C interface, a PD protocol chip and a PD power supply conversion module; the voltage input end of the Type C interface is connected with the voltage output end of the PD power conversion module, the voltage input end of the PD power conversion module is connected with an external power supply, the control signal input end of the PD power conversion module is connected with the control signal output end of the PD protocol chip, and the CC signal connecting end of the PD protocol chip is connected with the CC signal connecting end of the Type C interface; charging device treats the battery charging outfit through Type C interface connection, wherein:
the PD protocol chip is used for determining the required voltage of the powered device and controlling the PD power conversion module to convert the input voltage Vin into the required voltage of the powered device;
the PD power conversion module is configured to perform voltage conversion on the input voltage Vin, output a converted voltage VBUS after filtering, and sample a current of an output current path, and dynamically adjust the converted voltage VBUS according to the sampled current, so that the post-line output voltage Vo reaches a required voltage value of the powered device;
the TYPE C interface is used for providing the line-behind output voltage Vo formed after the conversion voltage VBUS passes through the conducting wire for the powered device.
Preferably, the voltage conversion module comprises a DC-DC conversion chip, a switch circuit, a filter circuit and a sampling resistor, wherein the input end of the switch circuit is connected with the power supply, the output end of the switch circuit is connected with the input end of the filter circuit, the control end of the switch circuit is connected with the DC-DC conversion chip, the output end of the filter circuit is connected with the positive input end of the sampling resistor, and the negative input end of the sampling resistor is connected with a Type C interface.
Preferably, a PWM control unit, a driving unit and a current detection amplifying unit are arranged in the DC-DC conversion chip, the PWM control unit is connected to the current detection amplifying unit, two ends of the sampling resistor are both connected to the current detection amplifying unit, and the switching circuit includes a power switching tube K1.
Preferably, the filter circuit includes an inductor L, a first capacitor C1 and a second capacitor C2, one end of the inductor, one end of the first capacitor C1 and one end of the second capacitor C2 are all connected to the positive input end of the sampling resistor, the negative input end of the sampling resistor is connected to the Type C interface, the other end of the inductor is connected to the switch circuit, and the other ends of the first capacitor C1 and the second capacitor C2 are all grounded.
Preferably, the power switch tube K1 is a PMOS tube or an NMOS tube, the gate of the power switch tube K1 is connected to the PWM control unit, the source is connected to the power supply, and the drain is connected to the filter circuit.
Preferably, the PWM control unit outputs a switch driving signal, the switch driving signal is input to the driving unit, the output end of the driving unit is connected to the control end of the power switch tube K1, and the driving unit controls the power switch tube K1 to be turned on and off according to the switch driving signal output by the PWM control module.
Preferably, the switch circuit comprises a first MOS transistor U48, a second MOS transistor U49, a third MOS transistor U50 and a fourth MOS transistor U51.
The utility model has the beneficial effects that: the PD protocol chip detects that the TYPE C interface is connected with the powered device and then carries out standard PD protocol communication with the powered device, the voltage requirement of the powered device is identified, the input voltage Vin is input into the PD power conversion module, the PD power conversion module carries out voltage conversion on the input voltage Vin and outputs a conversion voltage VBUS after filtering, the voltage of the conversion voltage VBUS after passing through a lead is a line output voltage Vo, the line output voltage Vo is provided for the powered device, due to parasitic resistance R2 of the lead, voltage drop is generated between the conversion voltage VBUS and the line output voltage Vo, the DC-DC conversion chip detects the current magnitude of the powered device in real time through the current detection amplification unit, a preset interval where the current value is located is obtained, the voltage of the conversion voltage VBUS is adjusted to be the voltage corresponding to the current preset interval, and therefore the line output voltage Vo reaches a set value, and output to TYPE C interface through the wire; the utility model greatly reduces the change of output voltage under different load currents, is simple to realize, and can realize line loss compensation only by presetting a plurality of groups of voltage/current values on a special register of a chip and then dynamically adjusting voltage output according to the actual required current of terminal equipment so as to compensate the inherent line loss voltage of TYPE C; when the utility model is applied to the charger, the constant voltage/constant current control can be realized, and simultaneously, compared with the traditional charger, the utility model does not need to increase the input/output port of the circuit and external components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the accompanying drawings:
fig. 1 is a block diagram of a PD charging circuit for automatically compensating line loss according to a preferred embodiment of the present invention;
FIG. 2 is a circuit diagram of a PD charging circuit for automatically compensating for line loss according to a preferred embodiment of the present invention;
fig. 3 is a circuit diagram of a PD power conversion module of the PD charging circuit capable of automatically compensating for line loss according to another preferred embodiment of the present invention;
fig. 4 is a circuit diagram of a PD protocol chip connection of a PD charging circuit for automatically compensating line loss according to another preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
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 various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 shows a PD charging circuit for automatically compensating line loss according to a preferred embodiment of the present invention, referring to fig. 2, including a Type C interface 1, a PD protocol chip 2, and a PD power conversion module 3; the voltage input end of the Type C interface 1 is connected with the voltage output end of the PD power supply conversion module 3, the voltage input end of the PD power supply conversion module 3 is connected with an external power supply, the control signal input end of the PD power supply conversion module 3 is connected with the control signal output end of the PD protocol chip 2, and the CC signal connection end of the PD protocol chip 2 is connected with the CC signal connection end of the Type C interface 1; charging device treats charging apparatus through Type C interface connection, wherein:
the PD protocol chip 2 is configured to determine a required voltage of the powered device, and control the PD power conversion module 3 to convert the input voltage Vin into the required voltage of the powered device;
the PD power conversion module 3 is configured to perform voltage conversion on the input voltage Vin, output a converted voltage VBUS after filtering, and sample a current of an output current path, and dynamically adjust the converted voltage VBUS according to the sampled current, so that the post-line output voltage Vo reaches a required voltage value of the powered device;
the TYPE C interface is used for providing the post-line output voltage Vo formed after the conversion voltage VBUS passes through the conducting wire to the powered device;
the PD protocol chip 2 detects that the TYPE C interface is connected with a powered device and then carries out standard PD protocol communication with the powered device, the voltage requirement of the powered device is identified, the input voltage Vin is input into the PD power conversion module 3, the PD power conversion module 3 carries out voltage conversion on the input voltage Vin and outputs the converted voltage VBUS after filtering, the voltage of the converted voltage VBUS after passing through a lead is the line output voltage Vo, the line output voltage Vo is provided for the powered device, due to parasitic resistance R2 of the lead, voltage drop is generated between the converted voltage VBUS and the line output voltage Vo, the DC-DC conversion chip 31 detects the current magnitude of the powered device in real time through the current detection amplification unit 313, the preset interval where the current value is located is obtained, the voltage of the converted voltage VBUS is adjusted to the voltage corresponding to the current preset interval, and therefore the line output voltage Vo reaches the set value, and output to TYPE C interface through the wire; the utility model greatly reduces the change of output voltage under different load currents, is simple to realize, and can realize line loss compensation only by presetting a plurality of groups of voltage/current values on a special register of a chip and then dynamically adjusting voltage output according to the actual required current of terminal equipment so as to compensate the inherent line loss voltage of TYPE C; when the utility model is applied to the charger, the constant voltage/constant current control can be realized, and simultaneously, compared with the traditional charger, the utility model does not need to increase the input/output port of the circuit and external components.
As shown in fig. 1-2, the voltage conversion module includes a DC-DC conversion chip 31, a switch circuit 32, a filter circuit 33, and a sampling resistor R1, wherein an input end of the switch circuit 32 is connected to the power supply, an output end of the switch circuit 32 is connected to an input end of the filter circuit 33, a control end of the switch circuit is connected to the DC-DC conversion chip 31, an output end of the filter circuit 33 is connected to a positive input end of the sampling resistor R1, and a negative input end of the sampling resistor R1 is connected to a Type C interface 1;
the model of the DC-DC conversion chip is SC8815, the DC-DC conversion chip is a quick charge detection chip, can manage a rechargeable battery, and is a synchronous buck-boost charge controller, the positive input end of the current detection amplifying unit is connected with an SNS2P port, the negative input end of the current detection amplifying unit is connected with an SNS2N port, the current detection amplifying unit samples the voltage difference between the SNS2N port and the SNS2P port, and the voltage difference reflects the output current flowing through a sampling resistor R2 which is bridged between the SNS2P port and the SNS2N port.
As shown in fig. 2, a PWM control unit 311, a driving unit 312 and a current detection amplifying unit 313 are arranged in the DC-DC conversion chip 31, the PWM control unit 311 is connected to the current detection amplifying unit 313, two ends of the sampling resistor R1 are both connected to the current detection amplifying unit 313, and the switching circuit 32 includes the driving unit 312;
the PWM control unit 311 is connected to the output end of the current detection amplifying unit and configured to receive the sampling current sent by the current detection amplifying unit, generate a PWM control signal according to the sampling current, and send the PWM control signal to the driving unit 312 through the PWM terminal, where the PWM control signal has a predetermined duty ratio; the control end of the driving unit 312 is connected to the PWM end of the PWM control unit 311, the input end of the PWM control unit 311 is connected to the power input end, and the output end of the driving unit 312 is connected to the power switch tube K1; the driving unit 312 and the power switch K1 are configured to receive the PWM control signal, and adjust the duty ratio of the on-time of the input terminal and the output terminal thereof according to the PWM control signal, so as to adjust the output voltage. In the above process, the PWM control unit 311 may determine the line loss by detecting the current of the sampling resistor R1, and further determine the PWM control signal output to the PWM voltage modulation module according to the divided voltage value of the sampling resistor R1, and the PWM voltage modulation module controls the duty ratio of the on-time of the input terminal and the output terminal thereof by the PWM control signal, thereby implementing the adjustment of the voltage output by the power supply pin of the USB interface.
As shown in fig. 2, the filter circuit 33 includes an inductor L, a first capacitor C1 and a second capacitor C2, one end of each of the inductor, the first capacitor C1 and the second capacitor C is connected to the positive input end of the sampling resistor R1, the negative input end of the sampling resistor R1 is connected to the Type C interface 1, the other end of the inductor is connected to the switch circuit 32, and the other ends of the first capacitor C1 and the second capacitor C2 are grounded; the inductor L is used for eliminating ripples of the output voltage of the DC-DC conversion chip U1, and is matched with filtering of the capacitor C2 and the capacitor C1, and a TVS diode can be added in the circuit to stabilize the voltage, so that the DC-DC conversion chip U1 can output stable voltage.
As shown in fig. 2, the power switch transistor K1 is a PMOS transistor or an NMOS transistor, the gate of the power switch transistor K1 is connected to the PWM control unit 311, the source is connected to the power supply, and the drain is connected to the input terminal of the filter circuit 33.
As shown in fig. 2, the PWM control unit 311 outputs a switch driving signal, the switch driving signal is input to the driving unit 312, an output end of the driving unit 312 is connected to a control end of the power switch transistor K1, and the driving unit 312 controls the power switch transistor K1 to be turned on or off according to the switch driving signal output by the PWM control module; when the output of the PWM control unit is at a high level, the power switch K1 is controlled to be switched on by the switch driving module; when the output of the PWM control unit is in a low level, the power switch K1 is controlled to be switched off by the switch driving module.
As shown in fig. 2, the power switch transistor K1 may be integrated into the DC-DC converter chip 31, in which case the power switch transistor K1 is a PMOs transistor, the source of the power switch transistor K1 is used as the Vin port of the DC-DC converter chip, the drain of the power switch transistor K1 is used as the SW port of the voltage converter, and the gate is connected to the PWM control unit.
The present invention further provides another preferred embodiment of a PD charging circuit capable of automatically compensating for line loss, as shown in fig. 3-4, the present embodiment has the same points as the previous embodiment, except that the switching circuit includes a first MOS transistor U48, a second MOS transistor U49, a third MOS transistor U50 and a fourth MOS transistor U51, gates of the first MOS transistor U48, the second MOS transistor U49, the third MOS transistor U50 and the fourth MOS transistor U51 are respectively connected to pins HD1, HD2, LD1 and LD2 of the DC-DC conversion chip, a drain of the first MOS transistor U48 is connected to the power supply, a source is connected to a drain of the third MOS transistor U50, a source of the third MOS transistor U50 is connected to a source of the fourth MOS transistor U51, a drain of the fourth MOS transistor U51 is connected to the source of the second MOS transistor U49, and a drain of the second MOS transistor U49 is connected to a positive input terminal of the sampling resistor; two ends of the inductor are respectively connected with a SW1 pin and a SW2 pin; the DC-DC conversion chip outputs a control signal to the PD protocol chip through I2C communication, and specifically, the SCL terminal and the SDL terminal of the DC-DC conversion chip are connected to the SCL terminal and the SDL terminal of the PD protocol chip, respectively.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.
Claims (7)
1. A PD charging circuit capable of automatically compensating line loss is characterized by comprising a Type C interface (1), a PD protocol chip (2) and a PD power conversion module (3); the voltage input end of the Type C interface (1) is connected with the voltage output end of the PD power conversion module (3), the voltage input end of the PD power conversion module (3) is connected with an external power supply, the control signal input end of the PD power conversion module (3) is connected with the control signal output end of the PD protocol chip (2), and the CC signal connection end of the PD protocol chip (2) is connected with the CC signal connection end of the Type C interface (1); the PD charging circuit of automatic compensation line loss passes through Type C interface (1) and connects the equipment of waiting to charge, wherein:
the PD protocol chip (2) is used for determining the required voltage of the powered device and controlling the PD power conversion module (3) to convert the input voltage Vin into the required voltage of the powered device;
the PD power supply conversion module (3) is used for performing voltage conversion on an input voltage Vin, outputting a conversion voltage VBUS after filtering, sampling the current of an output current path, and dynamically adjusting the conversion voltage VBUS according to the sampling current to enable the post-line output voltage Vo to reach the required voltage value of the powered device;
the TYPE C interface is used for providing the line-behind output voltage Vo formed after the conversion voltage VBUS passes through the conducting wire for the powered device.
2. The PD charging circuit capable of automatically compensating the line loss according to claim 1, wherein the PD power conversion module (3) comprises a DC-DC conversion chip (31), a switch circuit (32), a filter circuit (33) and a sampling resistor R1, wherein the input end of the switch circuit (32) is connected with a power supply, the output end of the switch circuit is connected with the input end of the filter circuit (33), the control end of the switch circuit is connected with the DC-DC conversion chip (31), the output end of the filter circuit (33) is connected with the positive input end of a sampling resistor R1, and the negative input end of the sampling resistor R1 is connected with the Type C interface (1).
3. The PD charging circuit capable of automatically compensating the line loss according to claim 2, characterized in that a PWM control unit (311), a driving unit (312) and a current detection amplifying unit (313) are arranged in the DC-DC conversion chip (31), the PWM control unit (311) is connected with the current detection amplifying unit (313), both ends of the sampling resistor R1 are connected with the current detection amplifying unit (313), and the switching circuit (32) comprises a power switch tube K1.
4. The PD charging circuit capable of automatically compensating the line loss according to claim 2, wherein the filter circuit (33) comprises an inductor L, a first capacitor C1 and a second capacitor C2, one end of the inductor, one end of the first capacitor C1 and one end of the second capacitor C2 are all connected with the positive input end of the sampling resistor R1, the negative input end of the sampling resistor R1 is connected with the Type C interface (1), the other end of the inductor is connected with the switch circuit (32), and the other ends of the first capacitor C1 and the second capacitor C2 are all grounded.
5. The PD charging circuit capable of automatically compensating the line loss as claimed in claim 3, wherein the power switch transistor K1 is a PMOS transistor or an NMOS transistor, the gate of the power switch transistor K1 is connected to the PWM control unit (311), the source is connected to the power supply, and the drain is connected to the filter circuit (33).
6. The PD charging circuit capable of automatically compensating the line loss according to claim 3, wherein the PWM control unit (311) outputs a switch driving signal, the switch driving signal is input into the driving unit (312), the output end of the driving unit (312) is connected with the control end of the power switch tube K1, and the driving unit (312) controls the power switch tube K1 to be turned on and off according to the switch driving signal output by the PWM control module.
7. The PD charging circuit capable of automatically compensating for line loss of claim 2, wherein the switching circuit (32) includes a first MOS transistor U48, a second MOS transistor U49, a third MOS transistor U50 and a fourth MOS transistor U51.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122185091.9U CN216390547U (en) | 2021-09-10 | 2021-09-10 | PD charging circuit capable of automatically compensating line loss |
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| CN202122185091.9U CN216390547U (en) | 2021-09-10 | 2021-09-10 | PD charging circuit capable of automatically compensating line loss |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114928244A (en) * | 2022-06-29 | 2022-08-19 | 深圳市微源半导体股份有限公司 | Line loss compensation correction method and circuit based on output current |
| CN115411814A (en) * | 2022-09-02 | 2022-11-29 | 深圳市磐鼎科技有限公司 | Charging device with automatic voltage compensation function and flat panel equipment |
-
2021
- 2021-09-10 CN CN202122185091.9U patent/CN216390547U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114928244A (en) * | 2022-06-29 | 2022-08-19 | 深圳市微源半导体股份有限公司 | Line loss compensation correction method and circuit based on output current |
| CN114928244B (en) * | 2022-06-29 | 2023-03-10 | 深圳市微源半导体股份有限公司 | Line loss compensation correction method and circuit based on output current |
| CN115411814A (en) * | 2022-09-02 | 2022-11-29 | 深圳市磐鼎科技有限公司 | Charging device with automatic voltage compensation function and flat panel equipment |
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