CN217469470U - Charging circuit and electronic device - Google Patents
Charging circuit and electronic device Download PDFInfo
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- CN217469470U CN217469470U CN202122036182.6U CN202122036182U CN217469470U CN 217469470 U CN217469470 U CN 217469470U CN 202122036182 U CN202122036182 U CN 202122036182U CN 217469470 U CN217469470 U CN 217469470U
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Abstract
The present disclosure relates to a charging circuit and an electronic device, the charging circuit including: the charge pump series circuit comprises two one-third-time charge pump circuits connected in series, wherein the input end of one-third-time charge pump circuit is used for being electrically connected with a power adapter, the input voltage of each one-third-time charge pump circuit is three times of the output voltage, and the input current is one third of the output current; and the input end of the battery module is electrically connected with the output end of the other one-third-time charge pump circuit in the charge pump series circuit.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of charging, in particular to a charging circuit and an electronic device.
Background
Along with the popularization of the intelligent terminal, the demand and the consumption of the intelligent terminal on electric quantity become larger and larger, so that the charging frequency of the terminal equipment becomes higher and higher, the charging efficiency of the terminal equipment is seriously influenced, and the use experience of a user is reduced.
At present, a charging circuit based on a Buck Switch charge circuit is often used in the industry to charge a terminal device with a large current. However, the Buck Switch charge circuit includes an output inductor with coil loss and magnetic core loss, which may result in a low voltage-reduction conversion efficiency of the whole charging circuit, so that the charging circuit cannot realize real large-current charging, i.e., the charging current is still small, and further the charging speed of the charging circuit is slow, the charging time is long, so that the charging efficiency is low, and since the energy lost by the output inductor is usually converted into heat energy, there is a problem that the charging circuit generates heat, and the safety is poor. In order to alleviate the above problems, a charging circuit based on a charge pump circuit is proposed in the related art to charge a battery of a terminal device, so that the charging efficiency and the heat generation are improved.
However, as the battery capacity of the terminal device increases and the charging current increases, the application of the charging circuit based on the charge pump circuit commonly used at present may encounter some bottlenecks. For example, the current USB power transfer pd (power delivery) protocol specifies an upper charging current limit of 3A. If the charging current of the battery in the terminal device is large, for example, 8A, the input current of the input terminal of the charging circuit based on the charge pump circuit at present exceeds the charging current upper limit specified by the PD protocol, so that the heating of the charging circuit becomes serious, and in addition, when the input current of the input terminal of the charging circuit exceeds the charging current upper limit specified by the PD protocol, an E-mark (electronic Marked cable) chip needs to be added to the input terminal of the charging circuit according to the PD protocol, so that the cost is increased.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, embodiments of the present disclosure provide a charging circuit and an electronic device.
In a first aspect, an embodiment of the present disclosure provides a charging circuit, including:
a charge pump series circuit comprising two series-connected one-third charge pump circuits, wherein an input of one of the one-third charge pump circuits is for electrical connection with a power adapter, an input voltage of each one-third charge pump circuit is three times an output voltage, and an input current is one third of the output current;
and the input end of the battery module is electrically connected with the output end of the other one-third-time charge pump circuit in the charge pump series circuit.
Optionally, in some embodiments of the present disclosure, the another one-third charge pump circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first capacitor, a second capacitor, and a third capacitor;
the input end of the first switch is electrically connected with the output end of the one-third-time charge pump circuit, and the output end of the first switch is connected with the input end of the second switch and the first capacitor;
the first capacitor is connected with the output end of the third switch and is also connected with the input end of the fourth switch;
the input end of the third switch is connected with the input end of the seventh switch and grounded;
the output end of the fourth switch is connected with the second capacitor and is also connected with the input end of the fifth switch;
the second capacitor is connected with the output end of the seventh switch and the input end of the sixth switch;
the output end of the second switch is connected with the output end of the fifth switch, is simultaneously connected with the output end of the sixth switch, and is connected with the third capacitor, the third capacitor is grounded, and the output end of the second switch is used as the output end of the other one-third-time charge pump circuit.
Optionally, in some embodiments of the present disclosure, a fourth capacitor is further connected to the input end of the first switch, and the fourth capacitor is grounded.
Optionally, in some embodiments of the disclosure, respective control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all connected to a charge controller, and the charge controller is connected to the one third-times charge pump circuit.
Optionally, in some embodiments of the present disclosure, the one-third charge pump circuit includes an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifth capacitor, a sixth capacitor, and a seventh capacitor;
the input end of the eighth switch is used for being electrically connected with the power adapter, and the output end of the eighth switch is connected with the input end of the ninth switch and the fifth capacitor;
the fifth capacitor is connected with the output end of the tenth switch and is also connected with the input end of the eleventh switch;
an input end of the tenth switch is connected with an input end of the fourteenth switch and grounded;
the output end of the eleventh switch is connected with the sixth capacitor and the input end of the twelfth switch;
the sixth capacitor is connected with the output end of the fourteenth switch and the input end of the thirteenth switch;
an output end of the ninth switch is connected to an output end of the twelfth switch, to an output end of the thirteenth switch, and to the seventh capacitor, and the seventh capacitor is grounded, where the output end of the ninth switch is used as an output end of the one-third-time charge pump circuit.
Optionally, in some embodiments of the present disclosure, an eighth capacitor is further connected to an input end of the eighth switch, and the eighth capacitor is grounded.
Optionally, in some embodiments of the present disclosure, the charging controller is connected to respective control terminals of the eighth switch, the ninth switch, the tenth switch, the eleventh switch, the twelfth switch, the thirteenth switch, and the fourteenth switch.
Optionally, in some embodiments of the present disclosure, the charge pump series circuit and the battery module are disposed on the same printed circuit board.
Optionally, in some embodiments of the present disclosure, the battery module includes a single cell battery or a dual cell battery.
In a second aspect, an embodiment of the present disclosure provides an electronic device, including a charging interface and the charging circuit of any of the above embodiments, where the charging interface is connected to an input terminal of the one-third-time charge pump circuit, and is configured to be electrically connected to the power adapter.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the charging circuit and the electronic device provided by the embodiment of the disclosure, the charge pump series circuit includes two one-third charge pump circuits connected in series, wherein an input end of one-third charge pump circuit is used for being electrically connected with a power adapter, an input voltage of each one-third charge pump circuit is three times of an output voltage, an input current is one third of the output current, and an input end of the battery module is electrically connected with an output end of the other one-third charge pump circuit in the charge pump series circuit. Thus, in this embodiment, one third of the charge pump voltage dropping circuit, i.e., 1/3 times of charge pump voltage dropping circuit, is used as the first stage voltage dropping circuit, and the other third of the charge pump voltage dropping circuit, i.e., 1/3 times of charge pump voltage dropping circuit, is used as the second stage voltage dropping circuit, which are connected in series and then connected with the battery module to charge the battery module, so that the input current of the previous third of the charge pump voltage dropping circuit can be reduced, for example, it is usually smaller than 3A specified by the PD protocol. Therefore, by adopting the charging circuit, the input current of the input end of the charging circuit is greatly reduced, the heat generation of the input end is reduced, the overall heat generation of the charging circuit is reduced, and the safety performance is improved. And the input current of the input end of the charging circuit is usually less than 3A, and an E-Mark chip is not required to be added according to the PD protocol specification, so that the cost is saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a circuit block diagram of a charging circuit of an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a one-third charge pump circuit of FIG. 1;
FIG. 3 is another schematic circuit diagram of a one-third charge pump circuit of FIG. 1;
fig. 4 is a schematic diagram of an electronic device of an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
It is to be understood that, hereinafter, "at least one" means one or more, "a plurality" means two or more. "and/or" is used to describe the association relationship of the associated object, and indicates that there may be three relationships, for example, "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural.
Fig. 1 schematically illustrates a charging circuit according to an embodiment of the present disclosure, where the charging circuit 10 includes a charge pump series circuit including two one-third times charge pump circuits (101, 102) connected in series, and a battery module 103. The input end of one-third-time charge pump circuit 101 is used for electrically connecting with power adapter 20, the input voltage of one-third-time charge pump circuit 101 is three times of the output voltage, and the input current is one third of the output current, that is, one-third-time charge pump circuit 101 is 1/3 times of charge pump voltage reduction circuit. The input terminal of the other one-third-time charge pump circuit 102 is electrically connected to the output terminal of the one-third-time charge pump circuit 101, the input voltage of the other one-third-time charge pump circuit 102 is three times of the output voltage, the input current is one third of the output current, that is, the one-third-time charge pump circuit 101 is also an 1/3-time charge pump voltage reduction circuit. The input terminal of the battery module 103 is electrically connected to the output terminal of the other one-third charge pump circuit 102 in the charge pump series circuit.
In this embodiment, one-third charge pump circuit 101, i.e., 1/3 charge pump voltage reduction circuit, is used as the first-stage voltage reduction circuit, and the other one-third charge pump circuit 102, i.e., 1/3 charge pump voltage reduction circuit, is used as the second-stage voltage reduction circuit, which are connected in series and then connected to the battery module 103 to charge the battery module 103.
In one example, for a battery module, such as a single cell battery, the battery voltage is fully charged to about 4.5V, and if the battery charging current is 12A, since the two stages of 1/3-fold charge pump voltage reduction circuits are connected in series, the input current of the second stage 1/3-fold charge pump voltage reduction circuit is 4A and the input voltage is about 13.5V, while the input current of the first stage 1/3-fold charge pump voltage reduction circuit is about 1.3A and the input voltage is about 40.5V. This can greatly reduce the input current, which can reduce the input current of the charge pump circuit by one third, as is usually less than 3A specified by the PD protocol.
Therefore, the charging circuit with the two stages of 1/3 times of charge pump voltage reduction circuits connected in series is adopted, the input current of the input end of the charging circuit is greatly reduced, the heat generation of the input end is reduced, the overall heat generation of the charging circuit is reduced, and the safety performance is improved. And the input current of the input end of the charging circuit is usually less than 3A, and an E-Mark chip is not required to be added according to the PD protocol specification, so that the cost is saved.
Optionally, in some embodiments of the present disclosure, the another one-third-time charge pump circuit 102 includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first capacitor, a second capacitor, and a third capacitor; the input end of the first switch is electrically connected with the output end of the one-third-time charge pump circuit, and the output end of the first switch is connected with the input end of the second switch and the first capacitor; the first capacitor is connected with the output end of the third switch and is also connected with the input end of the fourth switch; the input end of the third switch is connected with the input end of the seventh switch and grounded; the output end of the fourth switch is connected with the second capacitor and is also connected with the input end of the fifth switch; the second capacitor is connected with the output end of the seventh switch and the input end of the sixth switch; the output end of the second switch is connected with the output end of the fifth switch, is connected with the output end of the sixth switch, and is connected with the third capacitor, the third capacitor is grounded, and the output end of the second switch is used as the output end of the other one-third-time charge pump circuit.
For example, as shown in fig. 2, the one-third charge pump circuit 102 of the second stage may include a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, a first capacitor C1, a second capacitor C2, and a third capacitor C3. An input terminal of the first switch Q1 is used as an input terminal VIN of the one-third-time charge pump circuit 102, and is electrically connected to an output terminal of the one-third-time charge pump circuit 101, an output terminal of the first switch Q1 is connected to an input terminal of the second switch Q2 and the first capacitor C1, and the first capacitor C1 is connected to an output terminal of the third switch Q3 and is simultaneously connected to an input terminal of the fourth switch Q4. An input terminal of the third switch Q3 is connected to an input terminal of the seventh switch Q7 and to ground. The output end of the fourth switch Q4 is connected with the second capacitor C2, and is connected with the input end of the fifth switch Q5. The second capacitor C2 is connected to the output of the seventh switch Q7 and to the input of the sixth switch Q6. The output end of the second switch Q2 is connected to the output end of the fifth switch Q5, connected to the output end of the sixth switch Q6, and connected to the third capacitor C3, where the third capacitor C3 is grounded, and the output end of the second switch Q2 is used as the output end VOUT of the one-third charge pump circuit 102.
By adopting the one-third-time charge pump circuit 102 of the embodiment, the circuit structure is simple, and no inductance element is adopted, so that the power conversion efficiency of the charging circuit is improved, if the charging efficiency can reach about 98%, the heating value is reduced, and the safety is improved.
Optionally, in some embodiments of the present disclosure, respective control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are all connected to a charge controller, and the charge controller is connected to the one-third-time charge pump circuit.
For example, as shown in fig. 3, respective control terminals of the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 are all connected to the charging controller 104, that is, the charging circuit 10 may further include the charging controller 104, and the charging controller 104 may be connected to the one-third-time charge pump circuit 101. For example, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 may all be MOS transistors switches, but are not limited thereto.
That is, the 1/3 times charge pump step-down circuit may be composed of 7 MOS switches and 3 capacitors. The charging controller 104 controls the on and off of each MOS transistor to realize the series connection and the parallel connection of the capacitors C1/C2/C3, thereby realizing the voltage reduction. Specifically, the 1/3 times charge pump voltage reduction circuit works according to the following principle:
stage 1: the charging controller 104 outputs control signals to enable the switches Q1, Q4 and Q6 to be closed, the switches Q2, Q3 and Q7 to be opened, the capacitors C1, C2 and C3 are connected in series, and the output voltage VOUT is approximately equal to 1/3 VIN.
And (2) stage: the charging controller 104 outputs control signals to make the switches Q2, Q3, Q5 and Q7 all closed, and the switches Q1, Q4 and Q6 are opened, so that the capacitors C1, C2 and C3 are connected in parallel, and the output voltage VOUT is equal to 1/3 VIN.
Optionally, in some embodiments of the present disclosure, the one-third-times charge pump circuit 101 includes an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifth capacitor, a sixth capacitor, and a seventh capacitor; the input end of the eighth switch is used for being electrically connected with the power adapter, and the output end of the eighth switch is connected with the input end of the ninth switch and the fifth capacitor; the fifth capacitor is connected with the output end of the tenth switch and is also connected with the input end of the eleventh switch; an input end of the tenth switch is connected with an input end of the fourteenth switch and grounded; the output end of the eleventh switch is connected with the sixth capacitor and the input end of the twelfth switch; the sixth capacitor is connected with the output end of the fourteenth switch and is also connected with the input end of the thirteenth switch; the output end of the ninth switch is connected to the output end of the twelfth switch, the output end of the thirteenth switch, the seventh capacitor, and the ground, wherein the output end of the ninth switch is used as the output end of the one-third-time charge pump circuit 101.
It should be noted that the circuit schematic diagram of the one-third-time charge pump circuit 101 of the first stage is substantially the same as that of the one-third-time charge pump circuit 102 of the second stage shown in fig. 2 or fig. 3, and is not described here again. The difference is that the output terminal of the ninth switch, which is the output terminal of the first one-third-times charge pump circuit 101, is connected to the input terminal of the first switch Q1, and the input terminal of the ninth switch is connected to the power adapter 20.
Optionally, in some embodiments of the present disclosure, an eighth capacitor is further connected to an input end of the eighth switch, and the eighth capacitor is grounded. The eighth capacitance may be referred to herein as the fourth capacitance C4 shown in fig. 2.
Optionally, in some embodiments of the present disclosure, the charging controller 104 is connected to respective control terminals of the eighth switch, the ninth switch, the tenth switch, the eleventh switch, the twelfth switch, the thirteenth switch, and the fourteenth switch (not shown), and specifically, reference may be made to a similar connection relationship as shown in fig. 3. That is, the charge controller 104 may also control on and off of each switch in the one-third-time charge pump circuit 101 to implement series connection and parallel connection of the fifth capacitor, the sixth capacitor, and the seventh capacitor, so as to implement voltage reduction.
Optionally, in some embodiments of the present disclosure, the charge pump series Circuit, i.e., the one-third-times charge pump Circuit 101, the one-third-times charge pump Circuit 102, and the battery module 103, are disposed on a same printed Circuit board pcb (printed Circuit board). Thus, the integration level of the circuit of the charging circuit can be improved, and the miniaturization of the device is facilitated.
Optionally, in some embodiments of the present disclosure, the battery module 103 may include, but is not limited to, a single battery cell or a dual battery cell. When the double-cell battery is adopted, the charging with higher power can be realized, and the charging efficiency is improved.
The embodiment of the present disclosure further provides an electronic device, as shown in fig. 4, the electronic device 30 includes a charging interface 301 and the charging circuit 10 according to any of the above embodiments, where the charging interface 301 is connected to an input end of the one-third-time charge pump circuit 101, and is used to be electrically connected to the power adapter 20.
It is noted that, in this document, 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 previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. 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 disclosure. Thus, the present disclosure 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 (8)
1. A charging circuit, comprising:
a charge pump series circuit comprising two series-connected one-third charge pump circuits, wherein an input of one of the one-third charge pump circuits is for electrical connection with a power adapter, an input voltage of each one-third charge pump circuit is three times an output voltage, and an input current is one third of the output current;
the input end of the battery module is electrically connected with the output end of the other one-third-time charge pump circuit in the charge pump series circuit;
the other one-third-time charge pump circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first capacitor, a second capacitor and a third capacitor;
the input end of the first switch is electrically connected with the output end of the one-third-time charge pump circuit, and the output end of the first switch is connected with the input end of the second switch and the first capacitor;
the first capacitor is connected with the output end of the third switch and simultaneously connected with the input end of the fourth switch;
the input end of the third switch is connected with the input end of the seventh switch and grounded;
the output end of the fourth switch is connected with the second capacitor and is also connected with the input end of the fifth switch;
the second capacitor is connected with the output end of the seventh switch and the input end of the sixth switch;
the output end of the second switch is connected with the output end of the fifth switch, is simultaneously connected with the output end of the sixth switch, and is connected with the third capacitor, the third capacitor is grounded, and the output end of the second switch is used as the output end of the other one-third-time charge pump circuit;
the one-third charge pump circuit comprises an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifth capacitor, a sixth capacitor and a seventh capacitor;
the input end of the eighth switch is used for being electrically connected with the power adapter, and the output end of the eighth switch is connected with the input end of the ninth switch and the fifth capacitor;
the fifth capacitor is connected with the output end of the tenth switch and is also connected with the input end of the eleventh switch;
an input end of the tenth switch is connected with an input end of the fourteenth switch and grounded;
the output end of the eleventh switch is connected with the sixth capacitor and the input end of the twelfth switch;
the sixth capacitor is connected with the output end of the fourteenth switch and is also connected with the input end of the thirteenth switch;
an output end of the ninth switch is connected to an output end of the twelfth switch, to an output end of the thirteenth switch, and to the seventh capacitor, and the seventh capacitor is grounded, where the output end of the ninth switch is used as an output end of the one-third-time charge pump circuit.
2. The charging circuit of claim 1, wherein a fourth capacitor is further connected to the input terminal of the first switch, and the fourth capacitor is grounded.
3. The charging circuit of claim 1, wherein the control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all connected to a charging controller, and the charging controller is connected to the one-third-time charge pump circuit.
4. The charging circuit of claim 1, wherein an eighth capacitor is further connected to the input terminal of the eighth switch, and the eighth capacitor is grounded.
5. The charging circuit of claim 3, wherein the charging controller is connected to respective control terminals of the eighth switch, the ninth switch, the tenth switch, the eleventh switch, the twelfth switch, the thirteenth switch, and the fourteenth switch.
6. The charging circuit according to any one of claims 1 to 5, wherein the charge pump series circuit and the battery module are disposed on a same printed circuit board.
7. The charging circuit according to any one of claims 1 to 5, wherein the battery module comprises a single cell battery or a double cell battery.
8. An electronic device, comprising a charging interface and the charging circuit of any one of claims 1 to 7, wherein the charging interface is connected to an input terminal of the one-third-time charge pump circuit and is configured to be electrically connected to the power adapter.
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| CN202122036182.6U CN217469470U (en) | 2021-08-26 | 2021-08-26 | Charging circuit and electronic device |
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| CN202122036182.6U CN217469470U (en) | 2021-08-26 | 2021-08-26 | Charging circuit and electronic device |
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