Power supply module, voltage conversion chip, electronic equipment and voltage conversion method

Abstract

The invention relates to a power supply module, a voltage conversion chip, an electronic device and a voltage conversion method, the power supply module comprises a battery module, a charge pump module and a voltage conversion module, the voltage conversion module alternately inputs a first voltage from the battery module and a second voltage from the charge pump module, because a part of voltage of the voltage conversion module can be directly provided by the battery module, the part of voltage can omit the conversion processing process of the charge pump module, thereby reducing the extra power consumption generated during the change processing of the charge pump module. Therefore, the voltage conversion module can improve the overall conversion efficiency of the power supply module on the basis of being compatible with the voltage of the single cell, and reduces the loss of the whole machine. Furthermore, the voltage conversion module can flexibly adjust the magnitude of the third voltage based on the adjustment mode of the duty ratio of alternately inputting the first voltage and the second voltage, so that the third voltage can meet the power supply requirements of different loads, and the wide applicability of the power supply module is improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply module, a voltage conversion chip, an electronic device and a voltage conversion method. Background Art

[0002] With the continuous development of electronic devices, the functional modules in electronic devices are becoming more and more abundant, such as system on chip (SOC), camera module, screen, etc. Different functional modules need to be driven by appropriate voltage to work properly. However, in the related technology, it is difficult to achieve compatible voltage conversion efficiency when achieving appropriate voltage signal output, resulting in high overall loss of electronic devices. Summary of the invention

[0003] The embodiments of the present application provide a power supply module, a voltage conversion chip, an electronic device and a voltage conversion method, which can improve the voltage conversion efficiency and reduce the loss of the whole machine.

[0004] A first aspect of the present application provides a power supply module, comprising:

[0005] A battery module, comprising a plurality of battery cells connected in series, wherein the battery module is used to provide a first voltage;

[0006] a charge pump module, connected to the battery module, and configured to provide a second voltage according to the first voltage, wherein the second voltage is lower than the first voltage;

[0007] The voltage conversion module is connected to the battery module and the charge pump module respectively, and is used to alternately select the first voltage and the second voltage as inputs, and is also used to convert the input voltage to provide a third voltage for power supply.

[0008] A second aspect of the present application provides a voltage conversion chip, which is configured with a first input port, a second input port and an output port, and the voltage conversion chip includes:

[0009] a voltage conversion module, connected to the first input port, the second input port and the output port respectively, for alternately selecting to input a voltage from the first input port and a voltage from the second input port, and for converting the input voltage to provide a third voltage for power supply at the output port;

[0010] Among them, the first input port is used to connect to the battery module to receive a first voltage provided by the battery module, and the second input port is used to connect to the charge pump module to receive a second voltage output by the charge pump module, and the second voltage is obtained by the charge pump module according to the first voltage provided by the battery module, and the second voltage is lower than the first voltage.

[0011] A third aspect of the present application provides an electronic device, including:

[0012] The power supply module as described above; or the voltage conversion chip as described above.

[0013] A fourth aspect of the present application provides a voltage conversion method, which is applied to an electronic device, wherein the electronic device includes a battery module, a charge pump module, and a voltage conversion module; the voltage conversion method includes:

[0014] Determining a first voltage provided by the battery module and a second voltage provided by the charge pump module;

[0015] Controlling the voltage conversion module to alternately select the first voltage and the second voltage as inputs, and converting the input voltages to provide a third voltage for power supply;

[0016] Among them, the battery module includes a plurality of battery cells connected in series; the charge pump module is connected to the output end of the battery module, for receiving a first voltage provided by the battery module, and providing a second voltage according to the first voltage, wherein the second voltage is lower than the first voltage.

[0017] The above-mentioned power supply module, voltage conversion chip, electronic device and voltage conversion method, the power supply module includes a battery module, a charge pump module and a voltage conversion module, the voltage conversion module alternately inputs a first voltage from the battery module and a second voltage from the charge pump module, since part of the voltage of the voltage conversion module can be directly provided by the battery module, this part of the voltage can save the conversion process of the charge pump module, thereby reducing the additional power consumption generated when the charge pump module changes, and then the voltage conversion module can improve the overall conversion efficiency of the power supply module on the basis of being compatible with the single-cell voltage, and reduce the loss of the whole machine. Furthermore, the voltage conversion module can flexibly adjust the size of the third voltage based on the adjustment method of the duty cycle of the alternating input of the first voltage and the second voltage, so that the third voltage can meet the power supply requirements of different loads, and improve the wide applicability of the power supply module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is one of the structural block diagrams of a power supply module of an embodiment;

[0020] Figure 2 This is one of the structural block diagrams of a power supply module in the related art;

[0021] Figure 3 This is a second structural block diagram of a power supply module according to an embodiment;

[0022] Figure 4 This is a third structural block diagram of a power supply module of an embodiment;

[0023] Figure 5 This is a fourth structural block diagram of a power supply module of an embodiment;

[0024] Figure 6 1 is a diagram showing a voltage waveform at point A and a current waveform on the inductor L1 according to an embodiment;

[0025] Figure 7 This is the second structural block diagram of the power supply module in the related art;

[0026] Figure 8 This is a fifth structural block diagram of a power supply module of an embodiment;

[0027] Fig. 9 This is a sixth structural block diagram of a power supply module of an embodiment;

[0028] Fig.10 This is a seventh structural block diagram of a power supply module according to an embodiment;

[0029] Fig.11 A structural block diagram of a voltage conversion chip according to an embodiment;

[0030] Fig.12 is a flow chart of a voltage conversion method according to an embodiment;

[0031] Fig.13 FIG. 4 is a structural block diagram of an electronic device in an embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It is understood that the terms "first", "second", etc. used in this application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first voltage can be referred to as a second voltage, and similarly, a second voltage can be referred to as a first voltage. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features.

[0034] The embodiment of the present application provides a power supply module and a voltage conversion chip that can be applied to electronic devices. The power supply module and the voltage conversion chip can be used to power other devices in the electronic device. For example, the other devices can be display devices, radio frequency devices, etc. The specific type of other devices can be determined according to the type of electronic device, and the embodiment of the present application is not limited. Among them, the electronic device can be various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. For ease of understanding, the following example is taken as an example of an electronic device such as a mobile phone.

[0035] Figure 1 is a schematic diagram of the structure of a power supply module according to an embodiment, Figure 1 The power supply module includes a battery module 10 , a charge pump module 20 and a voltage conversion module 30 .

[0036] The battery module 10 includes a plurality of battery cells connected in series, and the battery module 10 is used to provide a first voltage; the charge pump module 20 is connected to the battery module 10, and is used to provide a second voltage (such as the V1X voltage in the figure) according to the first voltage (such as the V2X voltage in the figure), and the second voltage is lower than the first voltage; the voltage conversion module 30 is respectively connected to the battery module 10 and the charge pump module 20, and is used to alternately select the input first voltage and the second voltage, and is also used to convert the input voltage to provide a third voltage for power supply.

[0037] The battery module 10 includes a plurality of cells connected in series, for example, two cells connected in series. The battery module 10 is used to provide a first voltage. It can be understood that the first voltage is a DC voltage, and the DC voltage is related to the amount of electricity stored in the battery module 10. For example, the more electricity the battery module 10 stores, the greater the first voltage; the less electricity the battery module 10 stores, the smaller the first voltage. Therefore, the first voltage can be understood to be within a certain range of variation. For example, taking the battery module 10 including two cells connected in series as an example, the range of variation of the first voltage can be 6.8V to 9V.

[0038] The charge pump module 20 is connected to the output end of the battery module 10 and an input end of the voltage conversion module 30 respectively. The charge pump module 20 is used to receive the first voltage output by the battery module 10 and provide a second voltage according to the first voltage, and the second voltage is lower than the first voltage. The second voltage is obtained by the charge pump module 20 transforming the input first voltage. Based on the fact that the first voltage can be within a certain range of variation, the second voltage can also be within another range of variation accordingly.

[0039] The conversion ratio of the charge pump module 20 corresponds to the number of cells in the battery module 10. When the battery module 10 includes n series-connected cells, the conversion ratio of the charge pump module 20 may be n: 1. For example, in the case of dual cells, the conversion ratio of the charge pump module 20 may be 2: 1. At this time, the first voltage may range from 6.8V to 9V, and the second voltage may range from 3.4V to 4.5V.

[0040] The voltage conversion module 30 is connected to the battery module 10 and the charge pump module 20 respectively, and can alternately select the input of the first voltage from the battery module 10 and the second voltage from the charge pump module 20, and convert the input first voltage and second voltage respectively to provide a third voltage suitable for powering the load, so that the load works under the power supply of the third voltage. Specifically, when the voltage conversion module 30 inputs the first voltage, the voltage conversion module 30 is used to convert the first voltage to obtain the third voltage; when the voltage conversion module 30 inputs the second voltage, the voltage conversion module 30 is used to convert the second voltage to obtain the third voltage. Therefore, it can be understood that the voltage conversion module 30 modulates between the first voltage and the second voltage to obtain a pulse modulation signal (such as a PWM signal), and converts the pulse modulation signal to obtain a third voltage within the range between the first voltage and the second voltage.

[0041] Furthermore, the voltage conversion module 30 can alternately input the first voltage and the second voltage according to a preset duty cycle to obtain a pulse modulation signal, and obtain a third voltage after filtering the pulse modulation signal. Thus, the duty cycle can be flexibly adjusted according to the specific circumstances of the first voltage and the second voltage so that the voltage conversion module 30 can flexibly adjust the voltage size of the third voltage, thereby improving the flexibility and accuracy of the voltage output.

[0042] Among them, optionally, the third voltage can be used as the power supply voltage (i.e., ELVDD voltage) provided by the power supply module to the display driving circuit, so that the display driving circuit drives the working state of the display screen under the power supply of the ELVDD voltage, and the ELVDD voltage can be but not limited to 4.6V, 4.8V, etc. Taking the ELVDD voltage of 4.6V as an example, the first voltage can use a dual-cell voltage, and its range is 6.8V to 9V, and the second voltage is a single-cell voltage, which is obtained by the 2:1 charge pump module 20 stepping down the first voltage, and its range is 3.4V to 4.5V. The voltage conversion module 30 can obtain a 4.6V voltage by alternately inputting a 6.8-9V voltage and a 3.4-4.5V voltage, and converting the alternately input voltages. For the voltage conversion module 30 directly inputting the first voltage, by eliminating the conversion process of the 2:1 charge pump module 20, the voltage conversion module 30 can increase the conversion efficiency by about 2 percentage points and reduce heat loss.

[0043] In related technologies, such as Figure 2 As shown, in order to be compatible with the power supply architecture of a single cell, even if a battery module with multiple cells in series is used, the first voltage output by the battery module will be stepped down to the voltage of a single cell first, and then the voltage of the single cell will be boosted by a boost circuit (such as a boost circuit) to a target power supply voltage suitable for the load power supply demand. Therefore, the target power supply voltage usually needs to be converted by a charge pump module and a boost circuit at two stages, and the conversion efficiency is low, thereby increasing the loss of the whole machine. In this embodiment, the voltage conversion module 30 alternately inputs the first voltage from the battery module 10 and the second voltage from the charge pump module 20. Part of the voltage of the voltage conversion module 30 can be directly provided by the battery module 10. This part of the voltage can save the conversion process of the charge pump module 20, thereby reducing the additional power consumption generated by the change process of the charge pump module 20, and then the voltage conversion module 30 can improve the overall conversion efficiency of the power supply module on the basis of being compatible with the single cell voltage, and reduce the loss of the whole machine. Furthermore, the voltage conversion module 30 can flexibly adjust the size of the third voltage based on the adjustment method of the duty cycle of the alternating input of the first voltage and the second voltage, so that the third voltage can meet the power supply requirements of different loads and improve the wide applicability of the power supply module.

[0044] In one embodiment, when the voltage conversion module 30 inputs the first voltage and the second voltage alternately, as shown in FIG. Figure 3 As shown, the voltage conversion module 30 may include: a filter unit 310 and a first switch unit 320 .

[0045] The filter unit 310 is used to output a third voltage after filtering the received voltage; the first switch unit 320, the first end of the first switch unit 320 is connected to the battery module 10, the second end of the first switch unit 320 is connected to the charge pump module 20, and the third end of the first switch unit 320 is connected to the input end of the filter unit 310. The first switch unit 320 is used to alternately select the connection between the filter unit 310 and the battery module 10 and the charge pump module 20, so that the filter unit 310 alternately receives the first voltage and the second voltage.

[0046] The first switch unit 320 is connected to the battery module 10, the charge pump module 20 and the filter unit 310, respectively, and is used to alternately select and conduct the connection between the filter unit 310 and the battery module 10 and the charge pump module 20, respectively, so that the filter unit 310 alternately receives the first voltage and the second voltage. Specifically, when the connection between the filter unit 310 and the battery module 10 is turned on and the connection between the filter unit 310 and the charge pump module 20 is turned off, the filter unit 310 receives the first voltage; when the connection between the filter unit 310 and the battery module 10 is turned off and the connection between the filter unit 310 and the charge pump module 20 is turned on, the filter unit 310 receives the second voltage.

[0047] The filter unit 310 is connected to the first switch unit 320, and is used to filter the first voltage and the second voltage that are alternately input and then output a third voltage. Specifically, with respect to the filter unit 310, the first voltage and the second voltage that are alternately input form a PWM signal, and the filter unit 310 obtains the third voltage after filtering the PWM signal.

[0048] Alternatively, if Figure 4 As shown, the first switch unit 320 may include: a first switch circuit 321 and a second switch circuit 322, wherein the first end of the first switch circuit 321 is connected to the battery module 10, the first end of the second switch circuit 322 is connected to the charge pump module 20, and the second end of the first switch circuit 321 and the second end of the second switch circuit 322 are respectively connected to the filter unit 310; wherein the first switch circuit 321 and the second switch circuit 322 are alternately in the on state according to a preset duty cycle.

[0049] In which, when the voltage conversion module 30 alternately inputs the first voltage and the second voltage, the on-off states of the first switch circuit 321 and the second switch circuit 322 are opposite, and are alternately in the on state according to the preset duty cycle. By adjusting the duty cycle of the driving signal received by the first switch circuit 321 and the second switch circuit 322, the output voltage amplitude of the voltage conversion module 30 can be changed to output a third voltage close to the target power supply voltage.

[0050] Alternatively, if Figure 5 As shown ( Figure 5 Taking the dual-cell battery module 10 and the 2:1 charge pump module 20 as examples for illustration), the first switch circuit 321 and the second switch circuit 322 may include a MOS tube Q1 and a MOS tube Q2, respectively. Based on the alternating conduction of the MOS tube Q1 and the MOS tube Q2, the voltage at the connection point A between the MOS tube Q1 and the MOS tube Q2 is PWM modulated between the first voltage and the second voltage, and the third voltage is obtained by filtering by the filter unit 310. Furthermore, the MOS tube Q2 may adopt a MOS tube capable of switching the direction of the diode, or adopt a back-to-back tube, so as to prevent the voltage from leaking to the A point through the anti-parallel diode of the MOS tube Q2.

[0051] Optionally, please continue to refer to Figure 5 , the filter unit 310 may be an LC filter circuit, including an inductor L1 and a capacitor C1, wherein the first end of the inductor L1 is connected to the first switch circuit 321 and the second switch circuit 322 respectively. By the alternating conduction of the first switch circuit 321 and the second switch circuit 322, the inductor L1 and the capacitor C1 are in a state of continuous charging and discharging, thereby achieving filtering of the alternately input first voltage and second voltage. Specifically, Figure 6 The voltage waveform at point A and the current waveform on the inductor L1 are given respectively, wherein when the MOS tube Q1 is turned on and the MOS tube Q2 is turned off, the current of the inductor L1 gradually increases, and the capacitor C1 is charged. When the MOS tube Q1 is turned off and the MOS tube Q2 is turned on, since the current of the inductor L1 cannot change suddenly, a self-inductance potential is generated at both ends of the inductor L1, and the freewheeling loop formed by the MOS tube Q2 continues to discharge, and the current of the inductor L1 gradually decreases, and the capacitor C1 is discharged. By changing the duty ratio of the MOS tube Q1 and the MOS tube Q2, the magnitude of the third voltage can be controlled.

[0052] Take the third voltage as the ELVDD voltage (the ELVDD voltage is 4.6V as an example). As for the boost circuit in the power supply module involved in the related technical solution, for example Figure 7In the Boost circuit shown in the figure, the current on the MOS tube Q3 and the MOS tube Q4 in the Boost circuit is equal to the input current which is greater than the output current (the input voltage of the Boost circuit is less than the output voltage, so the input current is greater than the output current), and the lower the input voltage of the Boost circuit, the larger the input current is compared with the output current (when the power is constant, the smaller the input voltage, the larger the input current), the conduction loss of the MOS tube Q3 and the MOS tube Q4 is greater, and the efficiency of the boost circuit is lower. Therefore, the power supply module heats up seriously in the scenario where the first voltage is low and the brightness is high.

[0053] Compared with the related art, part of the voltage of the voltage conversion module 30 of this embodiment is directly derived from the battery module 10, which can save the conversion efficiency of 2:1CP. If the ripple of the inductor L1 is ignored, the current on the MOS tube Q1 and the MOS tube Q2 in this embodiment is equal to the output current. Therefore, in the case of high brightness, when the ELVDD load is heavy, the output voltage is large, and thus the output current is smaller (when the power is constant, the larger the output voltage, the smaller the output current). Therefore, in this embodiment, the current flowing through the MOS tube Q1 and the MOS tube Q2 is smaller, the conduction loss is lower, the efficiency is higher, and the whole machine heats up less in the high brightness scene.

[0054] In one embodiment, the voltage conversion module 30 can also be configured to be connected to the equipotential ground terminal, and the voltage conversion module 30 is also used to alternately select and input any two voltages among the first voltage, the second voltage and the ground voltage. Therefore, the voltage conversion module 30 can alternately input the first voltage and the second voltage, or alternately input the first voltage and the ground voltage, or alternately input the second voltage and the ground voltage according to actual needs, so that voltage conversion processing can be performed within a wider voltage range, and dynamic adjustment of the third voltage can be further realized.

[0055] Take the third voltage as the ELVDD voltage as an example. For example, for silicon negative electrode batteries, the voltage range of the battery module 10 is expanded, wherein the first voltage varies in the range of 5V-9V, and the second voltage varies in the range of 2.5V-4.5V. At this time, if the target power supply voltage of the voltage conversion module 30 needs to be dynamically adjusted, for example, between 2.5V and 4.6V, at this time, since the voltage conversion module 30 is also configured to be connected to the equipotential ground terminal, the voltage conversion module 30 can alternately input and convert any two of the first voltage, the second voltage and the ground voltage, and can more flexibly and dynamically adjust the ELVDD voltage within a wider voltage range, so that the third voltage can further meet the power supply requirements of different loads, and the different power supply requirements of the same load, thereby improving the wide applicability of the power supply module.

[0056] In one embodiment, when the voltage conversion module 30 can alternately input any two voltages among the first voltage, the second voltage, and the ground voltage, when the target power supply voltage of the voltage conversion module 30 is greater than the second voltage, the voltage conversion module 30 is used to alternately select the input of the first voltage and the second voltage; when the target power supply voltage is less than the second voltage, the voltage conversion module 30 is used to alternately select the input of the second voltage and the ground voltage. Thus, when the target power supply voltage is greater than the second voltage, the voltage conversion module 30 modulates and converts between the first voltage and the second voltage to obtain a third voltage between the first voltage and the second voltage; when the target power supply voltage is less than the second voltage, the voltage conversion module 30 modulates and converts between the second voltage and the ground voltage to obtain a third voltage between the second voltage and the ground voltage. It can be understood that the target power supply voltage of the voltage conversion module 30 can be set according to actual needs. For example, when the power supply module is used to supply power to a display screen, the target power supply voltage can be determined according to the parameters of the display screen.

[0057] In one embodiment, when the voltage conversion module 30 can alternately input any two voltages among the first voltage, the second voltage, and the ground voltage, as shown in FIG. Figure 8 As shown, the voltage conversion module 30 may include: a filtering unit 310 and a second switching unit 330 .

[0058] The filtering unit 310 is used to output a third voltage after filtering the received voltage; the second switch unit 330, the first end of the second switch unit 330 is connected to the battery module 10, the second end of the second switch unit 330 is connected to the charge pump module 20, the third end of the second switch unit 330 is connected to the equipotential ground terminal, and the fourth end of the second switch unit 330 is connected to the input end of the filtering unit 310. The second switch unit 330 is used to alternately select the connection between the filtering unit 310 and the first target terminal and the second target terminal, respectively. The first target terminal and the second target terminal correspond to any two ends of the output terminal of the battery module 10, the output terminal of the charge pump module 20, and the equipotential ground terminal.

[0059] Among them, the second switch unit 330 is respectively connected to the battery module 10, the charge pump module 20, the filter unit 310 and the equipotential ground terminal, and is used to alternately select the connection between the filter unit 310 and the first target terminal and the second target terminal, respectively. The first target terminal and the second target terminal correspond to any two ends of the output terminal of the battery module 10, the output terminal of the charge pump module 20, and the equipotential ground terminal, so that the filter unit 310 alternately receives any two voltages among the first voltage, the second voltage, and the ground voltage. Specifically, when the second switching unit 330 turns on the connection between the filter unit 310 and the battery module 10, and the connection between the filter unit 310 and the charge pump module 20 and the connection between the filter unit 310 and the equipotential ground terminal are disconnected, the filter unit 310 receives a first voltage; when the connection between the filter unit 310 and the battery module 10 is disconnected and the connection with the equipotential ground terminal is disconnected, and the connection between the filter unit 310 and the charge pump module 20 is turned on, the filter unit 310 receives a second voltage; when the connection between the filter unit 310 and the equipotential ground terminal is turned on, the connection between the battery modules 10 is disconnected, and the connection between the filter unit 310 and the charge pump module 20 is disconnected, the filter unit 310 receives a ground voltage.

[0060] Furthermore, when the target supply voltage of the voltage conversion module 30 is greater than the second voltage, the second switch unit 330 cuts off the connection between the filter unit 310 and the equipotential ground terminal, and alternately turns on the connection between the filter unit 310 and the battery module 10 and the charge pump module 20, respectively, so that the filter unit 310 alternately inputs the first voltage and the second voltage, thereby filtering the PWM signal formed by the first voltage and the second voltage to obtain a third voltage.

[0061] Furthermore, when the target supply voltage of the voltage conversion module 30 is greater than the second voltage, the second switch unit 330 cuts off the connection between the filter unit 310 and the battery module 10, and alternately turns on the connection between the filter unit 310 and the equipotential ground terminal and the charge pump module 20, so that the filter unit 310 alternately inputs the ground voltage and the second voltage, thereby filtering the PWM signal formed by the ground voltage and the second voltage to obtain the third voltage.

[0062] It can be understood that in other embodiments, the second switch unit 330 can also cut off the connection between the filter unit 310 and the charge pump module 20, and alternately turn on the connection between the filter unit 310 and the equipotential ground terminal and the battery module 10, so that the filter unit 310 alternately inputs the ground voltage and the first voltage, thereby filtering the PWM signal formed by the ground voltage and the first voltage to obtain the third voltage.

[0063] Alternatively, if Fig. 9As shown, the second switch unit 330 includes: a first switch circuit 331, a second switch circuit 332 and a third switch circuit 333, the first end of the first switch circuit 331 is the first end of the second switch unit 330, the first end of the second switch circuit 332 is the second end of the second switch unit 330, the first end of the third switch circuit 333 is the third end of the second switch unit 330, the second end of the first switch circuit 331, the second end of the second switch circuit 332 and the second end of the third switch circuit 333 are respectively the fourth ends of the second switch unit 330; wherein, any two switch circuits among the first switch circuit 331, the second switch circuit 332 and the third switch circuit 333 are alternately in the on state according to a preset duty cycle.

[0064] Wherein, when the target power supply voltage of the voltage conversion module 30 is greater than the second voltage, the third switch circuit 333 is in an off state, and the on-off states of the first switch circuit 331 and the second switch circuit 332 are opposite, and they are alternately in an on state according to a preset duty cycle. By adjusting the duty cycle of the drive signal received by the first switch circuit 331 and the second switch circuit 332, the output voltage amplitude of the voltage conversion module 30 can be changed to output a third voltage close to the target power supply voltage. When the target power supply voltage of the voltage conversion module 30 is less than the second voltage, the first switch circuit 331 is in an off state, and the on-off states of the third switch circuit 333 and the second switch circuit 332 are opposite, and they are alternately in an on state according to a preset duty cycle. By adjusting the duty cycle of the drive signal received by the third switch circuit 333 and the second switch circuit 332, the output voltage amplitude of the voltage conversion module 30 can be changed to output a third voltage close to the target power supply voltage.

[0065] It is understandable that in other embodiments, the second switch circuit 332 may be in the off state, and the on and off states of the first switch circuit 331 and the third switch circuit 333 may be opposite, and they may be alternately in the on state according to a preset duty cycle.

[0066] Alternatively, if Fig.10As shown, the first switch circuit 331, the second switch circuit 332, and the third switch circuit 333 may respectively include MOS transistors Q1, Q2, and Q3. When MOS transistors Q1 and Q2 conduct alternately and MOS transistor Q3 is in the off state, the voltage at the connection point A between MOS transistors Q1 and Q2 is PWM modulated between the first voltage and the second voltage, and the third voltage is obtained after filtering by the filtering unit 310. When MOS transistors Q1 and Q3 conduct alternately and MOS transistor Q2 is in the off state, the voltage at the connection point A between MOS transistors Q1 and Q3 is PWM modulated between the first voltage and the ground voltage, and the third voltage is obtained after filtering by the filtering unit 310; when MOS transistors Q3 and Q2 conduct alternately and MOS transistor Q1 is in the off state, the voltage at the connection point A between MOS transistors Q3 and Q2 is PWM modulated between the ground voltage and the second voltage, and the third voltage is obtained after filtering by the filtering unit 310. Optionally, please continue to refer to Figure X , the filtering unit 310 may be an LC filtering circuit. The LC filtering circuit can be referred to the description of the above embodiments and will not be elaborated here. The relevant working principles of MOS transistors Q1, Q2, Q3, and the LC filtering circuit can be referred to the above embodiments and will not be elaborated here.

[0067] In this embodiment, by adding MOS transistor Q3 between point A and the equipotential ground terminal, the voltage at point A can be three levels of V2X, V1X, and 0, and a wider voltage range can be obtained. That is, when the target ELVDD > V1X, the voltage at point A is modulated between V2X and V1X; when ELVDD < V1X, the voltage at point A is modulated between V1X and 0. Therefore, the ELVDD voltage can be dynamically adjusted more flexibly within a wider voltage range, so that the third voltage can further meet the power supply requirements of different loads and different power supply requirements of the same load, improving the wide applicability of the power supply module.

[0068] In one of the embodiments, the power supply module further includes: a control module, connected to the controlled terminals of each switch circuit, for outputting corresponding pulse control signals to each switch circuit to control the on / off states of each switch circuit. It can be understood that each switch circuit in this embodiment includes at least two of the first switch circuit 331, the second switch circuit 332, and the third switch circuit 333 in the above embodiments. Optionally, when each switch circuit respectively includes MOS transistors, the control module is connected to the gates of each MOS transistor to output gate pulse control signals to the gates of each MOS transistor, thereby controlling two target switch circuits to conduct alternately, and when there are three switch circuits, controlling the other switch circuit to be in the off state.

[0069] Thus, through the control of the control module, the pulse width modulation between the first voltage, the second voltage, the second voltage and the ground voltage, and the first voltage and the ground voltage can be realized, so as to modulate the DC voltages such as the first voltage, the second voltage, and the ground voltage into a series of pulses, and obtain the required output voltage by changing the duty cycle of the pulses. Furthermore, the control module can control the duty cycle by controlling the on-time of each switch circuit, thereby modulating the magnitude of the third voltage.

[0070] The present application embodiment also provides a voltage conversion chip 40, such as Fig.11 As shown, the voltage conversion chip 40 is configured with a first input port VIN1, a second input port VIN2 and an output port VOUT. The voltage conversion chip 40 includes: a voltage conversion module.

[0071] The voltage conversion module is respectively connected to the first input port VIN1, the second input port VIN2 and the output port VOUT, and is used for alternately selecting the input voltage from the first input port VIN1 and the voltage from the second input port VIN2, and is also used for converting the input voltage to provide a third voltage for power supply at the output port VOUT; wherein the first input port VIN1 is used to connect to the battery module 10 to receive the first voltage provided by the battery module 10, and the second input port VIN2 is used to connect to the charge pump module 20 to receive the second voltage output by the charge pump module 20, and the second voltage is obtained by the charge pump module 20 according to the first voltage provided by the battery module 10, and the second voltage is lower than the first voltage.

[0072] Among them, the voltage conversion module, the battery module 10, the charge pump module 20, etc. can refer to the relevant descriptions in the above embodiments, and will not be repeated here.

[0073] In one embodiment, the voltage conversion module is further used to connect to the equipotential ground terminal, and the voltage conversion chip 40 is further used to alternately select and input any two voltages among the first voltage, the second voltage and the ground voltage from the equipotential ground terminal.

[0074] Among them, the voltage conversion module is connected to the equipotential ground terminal, and the voltage conversion chip is also used to alternately select the input of any two voltages among the first voltage, the second voltage and the ground voltage from the equipotential ground terminal. For the relevant introduction, please refer to the above embodiment and will not be repeated here.

[0075] In one embodiment, the voltage conversion chip 40 may further include a control module, which may be connected to the relevant switch units and switch circuits inside the voltage conversion module to control the on / off states of the relevant switch units and switch circuits. The relevant embodiments of the control module may refer to the above embodiments.

[0076] Optionally, the voltage conversion chip 40 can be used to supply power to a display driving circuit, which is used to drive any display screen of an OLED (Organic Light-Emitting Diode) display screen, a QLED (Quantum dot Light Emitting Diode) display screen, a micro-LCD display screen, etc. Taking the OLED display screen as an example, the display driving circuit needs a suitable power supply voltage to power it to work normally, such as a constant positive voltage ELVDD.

[0077] Since most of the current voltage conversion chips 40 are designed for single-cell systems, the input voltage of the voltage conversion chip 40 is usually designed to be a single voltage, that is, a single-cell voltage. However, with the continuous development of power supply technology, battery modules 10 with dual-cell and four-cell architectures have been successively used in electronic devices, and the battery module 10 can output a variety of different voltages to the back-end circuit as needed. Therefore, compared with the voltage conversion chip 40 in the related art, the voltage conversion chip 40 of this embodiment adds a voltage input port so that the voltage conversion chip 40 can be adapted to the above-mentioned battery module 10 that can output multiple voltages, thereby achieving flexible and accurate voltage conversion, and providing a voltage conversion chip 40 with low loss and high conversion efficiency.

[0078] The present application also provides a voltage conversion method. Fig.12 This is a flow chart of a voltage conversion method according to an embodiment of the present invention, which is applied to an electronic device. The electronic device includes a battery module, a charge pump module and a voltage conversion module. The voltage conversion method includes: steps 122 to 124.

[0079] Step 122, determining a first voltage provided by the battery module and a second voltage provided by the charge pump module.

[0080] Step 124 , controlling the voltage conversion module to alternately select the first voltage and the second voltage as inputs, and converting the input voltages to provide a third voltage for power supply.

[0081] Wherein, the battery module includes a plurality of battery cells connected in series; the charge pump module is connected to the output end of the battery module, and is used to receive a first voltage provided by the battery module, and provide a second voltage according to the first voltage, and the second voltage is lower than the first voltage. The battery module, the charge pump module and the voltage conversion module can refer to the relevant introduction in the above embodiment, and will not be repeated here. Optionally, steps 122 to 124 in this embodiment can be performed by the control module in the above embodiment.

[0082] The voltage conversion method provided in this embodiment controls the voltage conversion module to alternately input the first voltage from the battery module and the second voltage from the charge pump module. Since part of the voltage of the voltage conversion module can be directly provided by the battery module, this part of the voltage can save the conversion process of the charge pump module, thereby reducing the additional power consumption generated when the charge pump module changes. The voltage conversion module can improve the overall conversion efficiency of the power supply module on the basis of being compatible with the single-cell voltage and reduce the loss of the whole machine. Furthermore, the voltage conversion method can flexibly adjust the size of the third voltage based on the adjustment method of the duty cycle of the alternating input of the first voltage and the second voltage, so that the third voltage can meet the power supply requirements of different loads and improve the wide applicability of the power supply module.

[0083] It should be understood that although Fig.12 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Fig.12 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0084] The embodiment of the present application also provides an electronic device, including the power supply module of the above embodiment; or the voltage conversion chip of the above embodiment. Based on the above power supply module and voltage conversion chip, the embodiment provides an electronic device with high voltage conversion efficiency and low power consumption.

[0085] Optionally, Fig.13The internal structure diagram of an electronic device of an embodiment. The electronic device includes a processor, a memory, a communication interface, a display screen and an input device connected by a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a voltage conversion method is implemented. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the housing of the electronic device, or an external keyboard, touchpad or mouse, etc.

[0086] Those skilled in the art will understand that Fig.13 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0087] In one embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0088] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0089] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0090] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power supply module, characterized in that: include: A battery module, comprising a plurality of battery cells connected in series, wherein the battery module is used to provide a first voltage; a charge pump module, connected to the battery module, and configured to provide a second voltage according to the first voltage, wherein the second voltage is lower than the first voltage; The voltage conversion module is connected to the battery module and the charge pump module respectively, and is used to alternately select the first voltage and the second voltage as inputs, and is also used to convert the input voltage to provide a third voltage for power supply.

2. The power supply module according to claim 1, characterized in that: The voltage conversion module comprises: A filtering unit, configured to filter the received voltage and then output the third voltage; The first switch unit is connected to the battery module, the charge pump module and the filter unit respectively, and is used to alternately select and conduct the connection between the filter unit and the battery module and the charge pump module respectively, so that the filter unit alternately receives the first voltage and the second voltage.

3. The power supply module according to claim 2, characterized in that: The first switch unit comprises: a first switch circuit and a second switch circuit, wherein a first end of the first switch circuit is connected to the battery module, a first end of the second switch circuit is connected to the charge pump module, and a second end of the first switch circuit and a second end of the second switch circuit are respectively connected to the filter unit; The first switch circuit and the second switch circuit are alternately in a conducting state according to a preset duty cycle.

4. The power supply module according to claim 1, characterized in that: The voltage conversion module is further configured to be connected to an equipotential ground terminal, and the voltage conversion module is further used to alternately select and input any two voltages among the first voltage, the second voltage and the ground voltage.

5. The power supply module according to claim 4, characterized in that: When the target supply voltage of the voltage conversion module is greater than the second voltage, the voltage conversion module is used to alternately select the first voltage and the second voltage as input; when the target supply voltage is less than the second voltage, the voltage conversion module is used to alternately select the second voltage and the ground voltage as input.

6. The power supply module according to claim 4, characterized in that: The voltage conversion module comprises: A filtering unit, configured to filter the received voltage and then output the third voltage; A second switch unit, wherein a first end of the second switch unit is connected to the battery module, a second end of the second switch unit is connected to the charge pump module, a third end of the second switch unit is connected to the equipotential ground end, and a fourth end of the second switch unit is connected to the input end of the filter unit. The second switch unit is used to alternately select and conduct the connection between the filter unit and a first target end and a second target end, respectively. The first target end and the second target end correspond to any two ends of the output end of the battery module, the output end of the charge pump module, and the equipotential ground end, respectively.

7. The power supply module according to claim 6, characterized in that: The second switch unit comprises: a first switch circuit, a second switch circuit and a third switch circuit, wherein the first end of the first switch circuit is the first end of the second switch unit, the first end of the second switch circuit is the second end of the second switch unit, the first end of the third switch circuit is the third end of the second switch unit, and the second end of the first switch circuit, the second end of the second switch circuit and the second end of the third switch circuit are respectively the fourth ends of the second switch unit; Any two of the first switch circuit, the second switch circuit and the third switch circuit are alternately in a conducting state according to a preset duty cycle.

8. The power supply module according to claim 3 or 7, characterized in that: The power supply module also includes: The control module is connected to the controlled end of each switch circuit and is used to output a corresponding pulse control signal to each switch circuit to control the on / off state of each switch circuit.

9. A voltage conversion chip, characterized in that: The voltage conversion chip is configured with a first input port, a second input port and an output port, and includes: a voltage conversion module, connected to the first input port, the second input port and the output port respectively, for alternately selecting to input a voltage from the first input port and a voltage from the second input port, and for converting the input voltage to provide a third voltage for power supply at the output port; Among them, the first input port is used to connect to the battery module to receive a first voltage provided by the battery module, and the second input port is used to connect to the charge pump module to receive a second voltage output by the charge pump module, and the second voltage is obtained by the charge pump module according to the first voltage provided by the battery module, and the second voltage is lower than the first voltage.

10. The voltage conversion chip according to claim 9, characterized in that: The voltage conversion module is further used to be connected to an equipotential ground terminal, and the voltage conversion chip is further used to alternately select and input any two voltages among the first voltage, the second voltage and a ground voltage from the equipotential ground terminal.

11. An electronic device, characterized in that: include: The power supply module according to any one of claims 1 to 8; Or a voltage conversion chip as described in any one of claims 9-10.

12. A voltage conversion method, characterized in that: Applied to electronic equipment, the electronic equipment includes a battery module, a charge pump module and a voltage conversion module; the voltage conversion method includes: Determining a first voltage provided by the battery module and a second voltage provided by the charge pump module; Controlling the voltage conversion module to alternately select the first voltage and the second voltage as inputs, and converting the input voltages to provide a third voltage for power supply; Among them, the battery module includes a plurality of battery cells connected in series; the charge pump module is connected to the output end of the battery module, for receiving a first voltage provided by the battery module, and providing a second voltage according to the first voltage, wherein the second voltage is lower than the first voltage.

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