CN112737319A

CN112737319A - Terminal equipment

Info

Publication number: CN112737319A
Application number: CN202011597978.2A
Authority: CN
Inventors: 陈佳; 刘小勇
Original assignee: Meizu Technology Co Ltd
Current assignee: Meizu Technology Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-30

Abstract

The present disclosure relates to a terminal device, the terminal device includes a battery and at least one charge pump, the battery is connected with the at least one charge pump, the battery includes three electric cores or four electric cores, the charge pump is used for reducing the voltage of a direct current charging signal input to the charge pump and charging the battery; the charge pump comprises a plurality of switches and N capacitors, wherein the switches are used for controlling the serial-parallel connection state of the capacitors in the charge pump according to the switch states of the switches so that the output voltage of the charge pump is equal to 1/N of the input voltage of the charge pump; wherein N is an integer greater than 1. Through the technical scheme, the bottleneck that the single battery cell cannot further realize high-power charging is effectively solved, the problem that a battery circuit board generates heat due to the single battery cell is solved, the charging efficiency is effectively improved, and the high-power charging is favorably realized.

Description

Terminal equipment

Technical Field

The present disclosure relates to the field of charging technology, and in particular, to a terminal device.

Background

The current terminal equipment mainly uses a single-cell battery for charging, but because the voltage of the fully charged single-cell battery is about 4.5V, when the charging current of the single-cell battery exceeds 8A, the problem that the circuit board of the battery side generates heat seriously occurs. In addition, the battery connector with smaller impedance and larger current needs to be replaced, which results in the cost increase of charging the single-cell battery, and increases the difficulty of routing and heat dissipation of the battery-side Circuit Board PCB (Printed Circuit Board), and the charging power of the single-cell battery reaches the bottleneck at about 36W.

In addition, in the BUCK charging chip with the voltage reduction function realized by the traditional terminal equipment charging scheme, the inductor has coil loss and magnetic core loss, so that the voltage reduction conversion efficiency of the whole BUCK charging chip is low, the energy lost by the inductor is basically converted into heat energy, the charging scheme of the BUCK structure generates heat seriously, and large-current charging cannot be realized.

Disclosure of Invention

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a terminal device, which effectively solves the bottleneck that a single battery cell cannot further realize high-power charging, improves the problem that a battery circuit board generates heat due to the single battery cell, effectively improves charging efficiency, and is beneficial to realizing high-power charging.

An embodiment of the present disclosure provides a terminal device, including:

the battery is connected with the at least one charge pump, the battery comprises three battery cells or four battery cells, and the charge pump is used for reducing the voltage of a direct current charging signal input into the charge pump and charging the battery;

the charge pump comprises a plurality of switches and N capacitors, wherein the switches are used for controlling the series-parallel connection state of the capacitors in the charge pump according to the switch states of the switches so that the output voltage of the charge pump is equal to 1/N of the input voltage of the charge pump; wherein N is an integer greater than 1.

Optionally, the charge pump is operated alternately in a first period and a second period;

in the first time period, the switch controls the capacitors in the charge pump to form a series connection relation according to the switch state of the switch;

and in the second time period, the switch controls the capacitor in the charge pump to form a parallel connection relation according to the switch state of the switch.

Optionally, the charge pump comprises a first capacitor, a second capacitor, a first switch, a second switch, a third switch, and a fourth switch;

the first switch to the fourth switch are sequentially connected in series between the input end and the ground end of the charge pump, the first end of the first capacitor is connected with the series node of the first switch and the second switch, and the second end of the first capacitor is connected with the series node of the third switch and the fourth switch;

and the first end of the second capacitor is connected with the serial connection node of the second switch and the third switch and is used as the output end of the charge pump, and the second end of the second capacitor is connected with the grounding end.

Optionally, the charge pump includes a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a ninth switch;

the fifth switch to the eighth switch are sequentially connected in series between the input end and the ground end of the charge pump, a first end of the second capacitor is connected with a series node of the fifth switch and the sixth switch, and a second end of the second capacitor is connected with a series node of the seventh switch and the eighth switch;

a first end of the ninth switch is connected with a second end of the first capacitor, and a second end of the ninth switch is connected with a first end of the second capacitor;

and a first end of the third capacitor is connected with a series node of the second switch and the third switch and a series node of the sixth switch and the seventh switch and serves as an output end of the charge pump, and a second end of the third capacitor is connected with the ground end.

Optionally, the charge pump includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch;

the first switch, the first capacitor, the second switch, the second capacitor, the third switch, the third capacitor and the fourth switch are sequentially connected in series between the input end of the charge pump and the output end of the charge pump;

the fifth switch, the first capacitor and the sixth switch are sequentially connected in series between the output end and the ground end of the charge pump, the seventh switch, the second capacitor and the eighth switch are sequentially connected in series between the output end and the ground end of the charge pump, and the ninth switch, the third capacitor and the tenth switch are sequentially connected in series between the output end and the ground end of the charge pump;

and the first end of the fourth capacitor is used as the output end of the charge pump, and the second end of the fourth capacitor is connected with the grounding end.

Optionally, the charge pump further comprises:

and the first end of the filter capacitor is connected with the input end of the charge pump, and the second end of the filter capacitor is grounded.

Optionally, the switch comprises a plurality of transistors, the plurality of transistors being connected in parallel.

Optionally, comprising:

and the input ends of all the charge pumps are connected, and the output ends of all the charge pumps are connected and connected with the battery.

Optionally, the terminal device further includes a receiving coil and a wireless power receiving component, the wireless power receiving component is respectively connected to the receiving coil and an input end of the charge pump, the wireless power receiving component is configured to convert an ac charging signal output by the receiving coil into a dc charging signal and perform low-dropout linear voltage stabilization on the dc charging signal, and the charge pump is configured to reduce a voltage of the processed dc charging signal and charge the battery; alternatively, the first and second electrodes may be,

the input end of the charge pump is connected with a power adapter, and the power adapter is used for converting an alternating current charging signal into a direct current charging signal and outputting the direct current charging signal to the charge pump.

Optionally, the method further comprises:

the control component comprises a plurality of switch control output ends, and the switch control output ends are connected with the control ends of the switches in a one-to-one correspondence mode.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the terminal equipment comprises the battery and at least one charge pump, the battery is connected with the at least one charge pump, the battery comprises three battery cells or four battery cells, the bottleneck that the single battery cell cannot further realize high-power charging is effectively solved, the problem that a battery circuit board generates heat due to the single battery cell is solved, the charging safety is improved, and the realization of high-power charging of 100W, 120W and above is facilitated. In addition, the charge pump is arranged to comprise a plurality of switches and N capacitors, the switches are used for controlling the series-parallel connection state of the capacitors in the charge pump according to the switch states of the switches, so that the output voltage of the charge pump is equal to 1/N of the input voltage of the charge pump, an inductor in a traditional BUCK charging chip is omitted, power loss caused by the inductor is effectively avoided, the heat productivity in the charging process is further reduced, the charging efficiency is effectively improved, and high-power charging is facilitated.

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 schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a charge pump according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a voltage step-down circuit used in the prior art;

fig. 4 is a schematic structural diagram of another terminal device provided in the embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of another charge pump provided in the embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another terminal device provided in the embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of another charge pump provided in the embodiment of the present disclosure;

fig. 8 is an equivalent structure diagram of a charge pump in a first period according to an embodiment of the disclosure;

fig. 9 is an equivalent structural diagram of a charge pump in a second period according to an embodiment of the disclosure;

fig. 10 is a schematic structural diagram of another terminal device provided in the embodiment of the present 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.

Fig. 1 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure. As shown in fig. 1, the terminal device includes a battery 5 and at least one charge pump 3, the battery 5 is connected to the at least one charge pump 3, fig. 1 exemplarily sets the terminal device to include one charge pump 3, the battery 5 includes three cells or four cells, and the charge pump 3 is configured to reduce a voltage of a dc charging signal input to the charge pump and charge the battery 5.

The current terminal equipment mainly uses a single-cell battery for charging, but because the voltage of the fully charged single-cell battery is about 4.5V, when the charging current of the single-cell battery exceeds 8A, the problem that the circuit board of the battery side generates heat seriously occurs. In addition, the battery connector with smaller impedance and larger through-current needs to be replaced, so that the charging implementation cost is increased, the difficulty of wiring and heat dissipation of a circuit board at the battery end is increased, and the charging power at the single-cell battery end reaches the bottleneck at about 36W.

In order to realize larger charging power, the terminal equipment can be charged by adopting double-cell batteries, namely, two cells are arranged in one battery, and the two cells are in series connection, so that the charging voltage of the double-cell batteries is twice of that of the single-cell battery, for the same battery end charging power, the charging current of the double-cell batteries is half of that of the single-cell battery, the heating problem of the circuit board at the end of the double-cell battery is improved to some extent relative to the single-cell battery, the requirement on a battery connector is reduced, and the wiring and heat dissipation difficulty of the circuit board at the end of the battery is also reduced. However, the voltage after the two-cell battery is fully charged is about 9V, and when the charging current of the two-cell battery exceeds 10A, the problem that the end circuit board of the battery generates heat seriously occurs similarly. In addition, the charging rate of the dual-battery cell is still high, and a battery connector with smaller impedance and larger through-flow is also required to be replaced, so that the charging cost is increased, the difficulty in wiring and heat dissipation of a circuit board at the battery end is increased, and the charging power at the dual-battery cell end reaches the bottleneck at about 90W.

The battery 5 in the terminal device is set to include three battery cells or four battery cells, that is, the battery 5 is a three-cell battery or a four-cell battery, the battery cells are in a series connection relationship, taking the battery 5 as a three-cell battery as an example, the charging voltage of the three-cell battery is 1.5 times of the charging voltage of the two battery cells, for the charging power of the same battery end, the charging current of the three-cell battery is 2/3 of the charging current of the two battery cells, the voltage of the three-cell battery after being fully charged is about 13.5V, when the charging power is about 90W, the charging current of the three-cell battery is about 6.67A, and the charging current of the two battery cells is 10A, so that the charging current of the battery is effectively reduced, the problem of heating of a circuit board is improved, and the charging safety is improved. In addition, the charging multiplying power of the three-cell battery is reduced, the requirement on a battery connector is further reduced, the charging implementation cost is reduced, the difficulty of wiring and heat dissipation of a battery side circuit board is reduced, and 100W, 120W and above high-power charging can be achieved by using the three-cell battery to charge the terminal equipment.

Therefore, the terminal device comprises the battery 5 and the at least one charge pump 3, the battery 5 is connected with the at least one charge pump 3, and the battery 5 comprises three electric cores or four electric cores, so that the bottleneck that the single-cell battery cannot further realize high-power charging is effectively solved, the problem that a battery circuit board generates heat due to the single-cell electric cores is solved, the charging safety is improved, and the realization of 100W, 120W and above high-power charging is facilitated.

Optionally, as shown in fig. 1, the terminal device may further include a receiving coil 1 and a wireless power receiving unit 2, the wireless power receiving unit 2 is connected to the receiving coil 1 and an input end of the charge pump 3, the wireless power receiving unit 2 is configured to convert an ac charging signal output by the receiving coil 1 into a dc charging signal and perform low-voltage-difference linear voltage stabilization on the dc charging signal, the charge pump 3 is configured to reduce a voltage of the processed dc charging signal and charge the battery, and at this time, the terminal device and the wireless charging apparatus cooperate to implement wireless charging.

Optionally, the terminal device may also adopt a wired charging mode, after the terminal device is connected to a power adapter, the input end of the charge pump 3 is connected to the power adapter, the power adapter is configured to convert an ac charging signal into a dc charging signal and output the dc charging signal to the charge pump 3, and the charge pump 3 is configured to reduce a voltage of the dc charging signal input to the charge pump 3 and charge the battery 5.

Fig. 2 is a schematic structural diagram of a charge pump according to an embodiment of the disclosure. With reference to fig. 1 and 2, the charge pump 3 includes a plurality of switches and N capacitors, the switches are used for controlling the serial-parallel connection state of the capacitors in the charge pump 3 according to their own switch states so that the output voltage of the charge pump 3 is equal to 1/N of the input voltage of the charge pump 3; wherein N is an integer greater than 1.

Fig. 3 is a schematic structural diagram of a voltage step-down circuit adopted in the prior art. As shown in fig. 3, the BUCK circuit, i.e. the BUCK circuit, includes two switches and an LC circuit, the LC circuit is composed of an inductor and a capacitor, however, the inductor has coil loss and core loss, which results in low BUCK conversion efficiency of the whole BUCK charging chip, and the energy lost by these main power devices is basically converted into heat energy, which results in serious heat generation of the charging scheme of the BUCK structure, and thus large current charging cannot be achieved.

The charge pump 3 comprises a plurality of switches and N capacitors, the switches are used for controlling the series-parallel connection state of the capacitors in the charge pump 3 according to the switch states of the switches so as to enable the output voltage of the charge pump 3 to be equal to 1/N of the input voltage of the charge pump 3, the voltage reduction function of the charge pump 3 is realized, an inductor in a traditional BUCK circuit is omitted, the power loss caused by the inductor is effectively avoided, although the number of the switches is increased compared with the traditional BUCK circuit, the on resistance of the switches is small, the direct current impedance of the inductor is large, the loss of all the switches in the charge pump 3 is smaller than or equal to the loss of the inductor in the BUCK circuit at most, at least two switches are further included in the BUCK circuit, and energy loss also exists in the switches, so that the heat productivity of the charging process is reduced compared with the traditional BUCK circuit in the embodiment, effectively improves the charging efficiency and is beneficial to realizing high-power charging.

Alternatively, each switch may be configured to include one transistor, or as shown in fig. 2, each switch may be configured to include a plurality of transistors, the plurality of transistors are configured in parallel, and fig. 2 exemplarily configures each switch to include two parallel transistors. Specifically, the plurality of parallel transistors form the switch in the charge pump 3, so that the equivalent on-resistance of the switch in the charge pump 3 is reduced, the on-loss of the switch in the charge pump 3 is reduced, and the charging efficiency is further improved compared with the case that a single transistor forms the switch in the charge pump 3.

Alternatively, in conjunction with fig. 1 and fig. 2, the charge pump 3 may be configured to alternately operate in a first time period and a second time period, in the first time period, the switch controls the capacitors in the charge pump 3 to form a series relationship according to its own switch state, and in the second time period, the switch controls the capacitors in the charge pump 3 to form a parallel relationship according to its own switch state. Illustratively, the voltage division characteristics of all the capacitors may be set to be the same, so as to realize that the output voltage of the charge pump 3 is equal to 1/N of the input voltage of the charge pump 3, i.e. realize the voltage reduction function of the charge pump 3, by the capacitors forming a series or parallel relationship at different periods respectively. In addition, since the charge pump 3 alternately operates in the first time period and the second time period, all the switches in the charge pump 3 need to be configured to include a plurality of transistors connected in parallel, so as to reduce the conduction loss of the switches in the charge pump 3, and further improve the charging efficiency.

Alternatively, with reference to fig. 1 and fig. 2, the charge pump 3 may include a first capacitor C1, a second capacitor C2, a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, the first switch K1 to the fourth switch K4 are sequentially connected in series between the input terminal VIN of the charge pump 3 and the ground terminal GND, a first terminal of the first capacitor C1 is connected to a series node M1 of the first switch K1 and the second switch K2, a second terminal of the first capacitor C1 is connected to a series node M2 of the third switch K3 and the fourth switch K4, a first terminal of the second capacitor C2 is connected to a series node M3 of the second switch K2 and the third switch K3 and serves as the output terminal VOUT of the charge pump 3, and a second terminal of the second capacitor C2 is connected to the ground terminal GND. Illustratively, the charge pump 3 may further include a filter capacitor C0, a first terminal of the filter capacitor C0 is connected to the input terminal VIN of the charge pump 3, a second terminal of the filter capacitor C0 is connected to the ground GND, and the filter capacitor C0 is configured to filter noise of the dc charging signal input by the input terminal VIN of the charge pump 3.

Specifically, N corresponding to the charge pump 3 with the structure shown in fig. 2 is equal to 2, that is, the output voltage of the charge pump 3 is equal to 1/2 of the input voltage of the charge pump 3, the input voltage of the charge pump 3 is twice the output voltage of the charge pump 3, the input current of the charge pump 3 is approximately equal to 1/2 of the output current of the charge pump 3, an inductor in a conventional BUCK circuit is omitted from the charge pump 3, so that the charging efficiency of the terminal device can reach 98% at most, and the terminal device high-power charging design can be applied.

As shown in fig. 2, the charge pump 3 is composed of four switches and three capacitors, and by controlling on and off of each switch, series connection and parallel connection of the first capacitor C1 and the second capacitor C2 are realized, so that the voltage reduction function of the charge pump 3 is realized. The specific principle is as follows: in a first period, the first switch K1 and the third switch K3 are controlled to be turned on, the second switch K2 and the fourth switch K4 are controlled to be turned off, the first capacitor C1 and the second capacitor C2 form a series relation, the first capacitor C1 and the second capacitor C2 are charged, and the output voltage of the charge pump 3, namely the voltage on the second capacitor C2 is approximately equal to 1/2 of the input voltage of the charge pump 3; in the second period, the second switch K2 and the fourth switch K4 are controlled to be turned on, the first switch K1 and the third switch K3 are turned off, the first capacitor C1 and the second capacitor C2 form a parallel relation, the first capacitor C1 and the second capacitor C2 are discharged, the output voltage of the charge pump 3, namely the voltage on the first capacitor C1 and the voltage on the second capacitor C2 are both equal to 1/2 of the input voltage of the charge pump 3, so that the voltage reduction function of the charge pump 3 is realized, and the output voltage of the charge pump 3 is equal to 1/2 of the input voltage of the charge pump 3. It should be noted here that the control switch is turned on, that is, all transistors in the control switch are turned on, and the control switch is turned off, that is, all transistors in the control switch are turned off.

Fig. 4 is a schematic structural diagram of another terminal device provided in the embodiment of the present disclosure. On the basis of the terminal device having the structure shown in fig. 1, as shown in fig. 4, the terminal device may be configured to include a plurality of charge pumps 3, wherein the input terminals of all the charge pumps 3 are connected, and the output terminals of all the charge pumps 3 are connected and connected to the battery 5, that is, all the charge pumps 3 form a parallel connection relationship. Illustratively, taking the charge pumps 3 of the structure in fig. 2 as an example, the output voltage of each charge pump 3 is equal to 1/2 of the input voltage of the charge pump 3, Ibat in fig. 4 represents the current of the dc charging signal input to the battery 5, Vbat represents the voltage of the dc charging signal input to the battery 5, N1 represents the number of charge pumps 3 in the terminal device, and the parameters of the power-on signal at each node are as indicated in fig. 4.

Specifically, the terminal device is provided with a plurality of charge pumps 3, the charge pumps 3 are connected in parallel, and the parallel charge pumps 3 are used for shunting the direct current charging signal input by the input end VIN of the charge pump 3, so that the current flowing through each charge pump 3 is reduced, the heat loss of the charge pump 3 is reduced, and the charging efficiency of the terminal device is further improved. In addition, in practical application, the number of the charge pumps 3 connected in parallel can be selected according to the current magnitude of the dc charging signal input by the input terminal VIN of the charge pump 3, so as to further improve the power conversion efficiency of the terminal device and reduce the heat loss of the terminal device.

Fig. 5 is a schematic structural diagram of another charge pump according to an embodiment of the disclosure. In conjunction with fig. 1 and 5, the charge pump 3 may be configured to include a first capacitor C1, a second capacitor C2, a third capacitor C3, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, and a ninth switch K9. The first switch K1 to the fourth switch K4 are sequentially connected in series between the input terminal VIN of the charge pump 3 and the ground terminal GND, the first end of the first capacitor C1 is connected to the series node M4 of the first switch K1 and the second switch K2, and the second end of the first capacitor C1 is connected to the series node M5 of the third switch K3 and the fourth switch K4. The fifth switch K5 to the eighth switch K8 are sequentially connected in series between the input terminal VIN of the charge pump 3 and the ground terminal GND, a first end of the second capacitor C2 is connected to the series node M6 of the fifth switch K5 and the sixth switch K6, and a second end of the second capacitor C2 is connected to the series node M7 of the seventh switch K7 and the eighth switch K8. A first terminal of the ninth switch K9 is connected to the second terminal of the first capacitor C1, and a second terminal of the ninth switch K9 is connected to the first terminal of the second capacitor C2. A first terminal of the third capacitor C3 is connected to the series node M8 of the second switch K2 and the third switch K3 and the series node M9 of the sixth switch K6 and the seventh switch K7 as the output terminal VOUT of the charge pump 3, and a second terminal of the third capacitor C3 is connected to the ground GND terminal. Illustratively, the charge pump 3 may further include a filter capacitor C0, a first terminal of the filter capacitor C0 is connected to the input terminal VIN of the charge pump 3, a second terminal of the filter capacitor C0 is connected to the ground GND, and the filter capacitor C0 is configured to filter noise of the dc charging signal input by the input terminal VIN of the charge pump 3.

Specifically, N corresponding to the charge pump 3 in the structure shown in fig. 5 is equal to 3, that is, the output voltage of the charge pump 3 is equal to 1/3 of the input voltage of the charge pump 3, the input voltage of the charge pump 3 is three times of the output voltage of the charge pump 3, the input current of the charge pump 3 is approximately equal to 1/2 of the output current of the charge pump 3, an inductor in a conventional BUCK circuit is omitted from the charge pump 3, so that the charging efficiency of the terminal device can reach 98% at most, and the terminal device high-power charging design can be applied.

As shown in fig. 5, the charge pump 3 is composed of nine switches and four capacitors, and by controlling the on and off of each switch, the series connection and the parallel connection of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are realized, so that the voltage reduction function of the charge pump 3 is realized. The specific principle is as follows: in a first period, the first switch K1, the seventh switch K7 and the ninth switch K9 are controlled to be turned on, the other switches are turned off, the first capacitor C1, the second capacitor C2 and the third capacitor C3 form a series connection relationship, the first capacitor C1, the second capacitor C2 and the third capacitor C3 are charged, and the output voltage of the charge pump 3, namely the voltage on the third capacitor C3 is approximately equal to 1/3 of the input voltage of the charge pump 3; in the second period, the second switch K2, the fourth switch K4, the sixth switch K6 and the eighth switch K8 are controlled to be turned on, the rest switches are all turned off, the first capacitor C1, the second capacitor C2 and the third capacitor C3 form a parallel relation, the first capacitor C1, the second capacitor C2 and the third capacitor C3 are discharged, the output voltage of the charge pump 3, namely the voltages on the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all approximately equal to 1/3 of the input voltage of the charge pump 3, so that the voltage reduction function of the charge pump 3 is realized, and the output voltage of the charge pump 3 is equal to 1/3 of the input voltage of the charge pump 3.

Fig. 6 is a schematic structural diagram of another terminal device provided in the embodiment of the present disclosure. On the basis of the terminal device having the structure shown in fig. 1, as shown in fig. 6, the terminal device may be configured to include a plurality of charge pumps 3, wherein the input terminals of all the charge pumps 3 are connected, and the output terminals of all the charge pumps 3 are connected and connected to the battery 5, that is, all the charge pumps 3 form a parallel connection relationship. Illustratively, taking the charge pumps 3 of the structure in fig. 5 as an example, the output voltage of each charge pump 3 is equal to 1/3 of the input voltage of the charge pump 3, Ibat in fig. 6 represents the current of the dc charging signal input to the battery 5, Vbat represents the voltage of the dc charging signal input to the battery 5, N1 represents the number of charge pumps 3 in the terminal device, and the parameters of the power-on signal at each node are as indicated in fig. 6. Likewise, the terminal equipment comprises a plurality of charge pumps 3, and the plurality of charge pumps 3 are connected in parallel, so that the charging efficiency of the terminal equipment is further improved.

Fig. 7 is a schematic structural diagram of another charge pump according to an embodiment of the disclosure. In conjunction with fig. 1 and 7, the charge pump 3 may be configured to include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, and a tenth switch K10. The first switch K1, the first capacitor C1, the second switch K2, the second capacitor C2, the third switch K3, the third capacitor C3 and the fourth switch K4 are sequentially connected in series between the input terminal VIN of the charge pump 3 and the output terminal VOUT of the charge pump 3. The fifth switch K5, the first capacitor C1 and the sixth switch K6 are sequentially connected in series between the output terminal VOUT of the charge pump 3 and the ground terminal GND, the seventh switch K7, the second capacitor C2 and the eighth switch K8 are sequentially connected in series between the output terminal VOUT of the charge pump 3 and the ground terminal GND, the ninth switch K9, the third capacitor C3 and the tenth switch K10 are sequentially connected in series between the output terminal VOUT of the charge pump 3 and the ground terminal GND, the first end of the fourth capacitor C4 is used as the output terminal VOUT of the charge pump 3, and the second end of the fourth capacitor C4 is connected to the ground terminal GND. Illustratively, the charge pump 3 may further include a filter capacitor C0, a first terminal of the filter capacitor C0 is connected to the input terminal VIN of the charge pump 3, a second terminal of the filter capacitor C0 is connected to the ground GND, and the filter capacitor C0 is configured to filter noise of the dc charging signal input by the input terminal VIN of the charge pump 3.

Specifically, N corresponding to the charge pump 3 with the structure shown in fig. 7 is equal to 4, that is, the output voltage of the charge pump 3 is equal to 1/4 of the input voltage of the charge pump 3, the input voltage of the charge pump 3 is four times the output voltage of the charge pump 3, the input current of the charge pump 3 is approximately equal to 1/4 of the output current of the charge pump 3, an inductor in a conventional BUCK circuit is omitted from the charge pump 3, so that the charging efficiency of the terminal device can reach 98% at most, and the terminal device high-power charging design can be applied.

As shown in fig. 7, the charge pump 3 is composed of ten switches and five capacitors, and by controlling on and off of each switch, series connection and parallel connection of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are realized, so that the voltage reduction function of the charge pump 3 is realized. The specific principle is as follows: in a first period, controlling a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4 to be turned on, and all the other switches to be turned off, wherein a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 are in a series connection relationship, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are charged, and charging currents of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 pass through the first switch K1 to the fourth switch K4, taking conducting resistances of the first switch K1 to the tenth switch K10 respectively corresponding to the first resistor R1 to the tenth resistor R10 as an example, so that an equivalent circuit formed in the first period is as shown in fig. 8, and an output voltage of the charge pump 3, that is a voltage on the fourth capacitor C4 approximately equal to an input voltage of the charge pump 1/4; in the second period, the fifth switch K5 to the tenth switch K10 are controlled to be turned on, the rest switches are all turned off, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 form a parallel relationship, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are discharged, the charging current of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 passes through the fifth switch K5 to the tenth switch K10, an equivalent circuit formed in the second period is as shown in fig. 9, the output voltage of the charge pump 3, namely, the voltages on the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all approximately equal to 1/4 of the input voltage of the charge pump 3, so that the voltage reduction function of the charge pump 3 is realized, and the output voltage of the charge pump 3 is equal to 1/4 of the input voltage of the charge pump 3.

As shown in fig. 8, the charge pump 3 omits an inductor in the conventional BUCK circuit, so as to effectively avoid power loss caused by the inductor, although the number of switches is increased relative to the conventional BUCK circuit, the on-resistance of the switches is small, the dc impedance of the inductor is large, the loss of all the switches connected in series in the charge pump 3 is smaller than or at most equal to the loss of the inductor in the BUCK circuit, and the BUCK circuit further includes at least two switches, and the switches also have energy loss.

Fig. 10 is a schematic structural diagram of another terminal device provided in the embodiment of the present disclosure. On the basis of the terminal device with the structure shown in fig. 1, as shown in fig. 10, the terminal device may be configured to include a plurality of charge pumps 3, wherein the input terminals of all the charge pumps 3 are connected, and the output terminals of all the charge pumps 3 are connected and connected with the battery, that is, all the charge pumps 3 form a parallel connection relationship. Illustratively, taking the charge pumps 3 of the structure in fig. 7 as an example, the output voltage of each charge pump 3 is equal to 1/4 of the input voltage of the charge pump 3, Ibat in fig. 10 represents the current of the dc charging signal input to the battery 5, Vbat represents the voltage of the dc charging signal input to the battery 5, N1 represents the number of charge pumps 3 in the terminal device, and the parameters of the power-on signal at each node are as indicated in fig. 10. Likewise, the terminal equipment comprises a plurality of charge pumps 3, and the plurality of charge pumps 3 are connected in parallel, so that the charging efficiency of the terminal equipment is further improved.

In addition, as the battery capacity of the terminal equipment increases and the charging current increases continuously, the application of the charge pump commonly used at present also encounters some bottlenecks, for example, the charging current 8A of the terminal equipment, the input current 4A of the charge pump, the heating of the charging wire at the input end, the related devices and the PCB board become serious, in this case, two charge pumps can be connected in series for use, so that the input current is 1/4 times of the output current, and the input voltage is 4 times of the output voltage, but the cost of the design is increased due to the addition of one charge pump, the space occupied by the PCB board is also increased, and the logic of software control is also relatively complex. The disclosed embodiment utilizes ten switches and five capacitors to form 4: 1 charge pump 3, need not a plurality of charge pumps and establish ties, overcome the cost increase, occupy the space increase of PCB board, the logic of software control is relatively complicated problem.

Optionally, with reference to fig. 1 to 10, the terminal device may further include a control unit 4, where the control unit 4 includes a plurality of switch control output terminals, the switch control output terminals are connected to the control terminals of the switches in a one-to-one correspondence, and the control unit 4 is configured to control the on and off of the switches in the charge pump 3 according to a set timing sequence, so that the output voltage of the charge pump 3 is equal to 1/N of the input voltage of the charge pump 3.

The terminal equipment comprises the battery and at least one charge pump, the battery is connected with the at least one charge pump, the battery comprises three battery cells or four battery cells, the bottleneck that the single battery cell cannot further realize high-power charging is effectively solved, the problem that a battery circuit board generates heat due to the single battery cell is solved, the charging safety is improved, and the realization of high-power charging of 100W, 120W and above is facilitated. In addition, the charge pump is arranged to comprise a plurality of switches and N capacitors, the switches are used for controlling the series-parallel connection state of the capacitors in the charge pump according to the switch states of the switches, so that the output voltage of the charge pump is equal to 1/N of the input voltage of the charge pump, an inductor in a traditional BUCK charging chip is omitted, power loss caused by the inductor is effectively avoided, the heat productivity in the charging process is further reduced, the charging efficiency is effectively improved, and high-power charging is facilitated. Illustratively, the terminal may be, but is not limited to, a mobile phone, a computer, a wearable device, and the like.

It is to be noted that 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 foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice 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

1. A terminal device, comprising:

2. The terminal device of claim 1, wherein the charge pump is alternately operated for a first period of time and a second period of time;

3. The terminal device of claim 2, wherein the charge pump comprises a first capacitor, a second capacitor, a first switch, a second switch, a third switch, and a fourth switch;

4. The terminal device of claim 2, wherein the charge pump comprises a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a ninth switch;

5. The terminal device of claim 2, wherein the charge pump comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch;

6. The terminal device of any of claims 2-5, wherein the charge pump further comprises:

7. The terminal device of claim 1, wherein the switch comprises a plurality of transistors connected in parallel.

8. The terminal device according to claim 1, comprising:

9. The terminal device according to claim 8, wherein the terminal device further comprises a receiving coil and a wireless power receiving component, the wireless power receiving component is respectively connected with the receiving coil and an input end of the charge pump, the wireless power receiving component is used for converting an alternating current charging signal output by the receiving coil into a direct current charging signal and performing low-voltage-difference linear voltage stabilization processing on the direct current charging signal, and the charge pump is used for reducing the voltage of the processed direct current charging signal and charging the battery; alternatively, the first and second electrodes may be,

10. The terminal device according to claim 1, further comprising: