Charge pump circuits and electronic devices

Abstract

This application discloses a charge pump circuit and an electronic device, wherein the charge pump circuit includes an energy storage unit, a control unit, and a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch controlled by the control unit; the first switch, the second switch, and the third switch are connected in series, and the common terminal of the first switch and the second switch serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit; the fourth switch, the sixth switch, and the fifth switch are connected in series between the voltage input terminal and the voltage output terminal of the second-stage voltage regulation of the charge pump circuit; the first terminal of the energy storage unit is connected between the first switch and the second switch, and the second terminal of the energy storage unit is connected to the common terminal of the third switch, the fourth switch, and the sixth switch; the first terminal of the seventh switch is connected between the first switch and the second switch, and the second terminal of the seventh switch is connected between the fifth switch and the sixth switch.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, specifically relating to a charge pump circuit and electronic device. Background Technology

[0002] With the development of technology, mobile phones and other electronic devices have become increasingly widely used. Currently, mobile phones and other electronic devices generally use charge pump circuits to achieve DC-DC voltage conversion.

[0003] When using a charge pump circuit to achieve DC-DC voltage conversion, it typically only performs a step-up or step-down conversion once, adjusting the DC voltage to half or twice the input voltage. For example, a charge pump circuit can convert a 16V DC voltage to an 8V DC voltage, or vice versa.

[0004] If two voltage boost / buck cycles are required, two charge pump circuits are needed to perform voltage regulation sequentially. Specifically, charge pump circuit A is used for the first stage of voltage regulation, followed by charge pump circuit B for the second stage. Because two charge pump circuits are required to achieve the two-stage boost / buck process, the cost is relatively high. Summary of the Invention

[0005] This application aims to provide a charge pump circuit and electronic device, thereby providing a charge pump circuit that supports two-stage voltage regulation.

[0006] In a first aspect, embodiments of this application propose a charge pump circuit, including a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an energy storage unit, and a control unit;

[0007] Among them, the first switch, the second switch and the third switch are connected in series, and the common terminal of the second switch and the third switch serves as the voltage output terminal of the first stage of voltage regulation of the charge pump circuit.

[0008] The fourth, sixth, and fifth switches are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulator of the charge pump circuit.

[0009] The first end of the energy storage unit is connected between the first switch and the second switch, and the second end of the energy storage unit is connected to the common end of the third switch, the fourth switch and the sixth switch;

[0010] The first end of the seventh switch is connected between the first and second switches, and the second end of the seventh switch is connected between the fifth and sixth switches;

[0011] The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are connected to the control unit.

[0012] Secondly, embodiments of this application propose a charge pump circuit, including a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, and an energy storage unit;

[0013] The first terminal of the first switch is connected to the first ground terminal and the negative terminal of the battery, and the second terminal of the first switch is connected to the first terminal of the second switch.

[0014] The second terminal of the second switch is electrically connected to the first terminal of the third switch. The junction where the second terminal of the second switch and the first terminal of the third switch are connected serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit is connected to the positive terminal of the battery.

[0015] The second end of the third switch is connected to the first end of the fourth switch and the second end of the sixth switch; the first end of the sixth switch is connected to the second end of the fifth switch.

[0016] The first end of the seventh switch is connected to the second end of the first switch and the first end of the second switch; the second end of the seventh switch is connected to the second end of the fifth switch and the first end of the sixth switch.

[0017] The first end of the energy storage unit is connected to the second end of the first switch and the first end of the second switch. The second end of the energy storage unit is connected to the second end of the third switch, the first end of the fourth switch and the second end of the sixth switch.

[0018] The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are respectively connected to control signals;

[0019] When the charge pump circuit is in buck mode, the second terminal of the fourth switch is the voltage input terminal of the charge pump circuit, and the first terminal of the fifth switch is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

[0020] When the charge pump circuit is in boost mode, the second terminal of the fourth switch is the voltage output terminal of the secondary voltage regulation of the charge pump circuit, and the first terminal of the fifth switch is the voltage input terminal of the charge pump circuit.

[0021] Thirdly, embodiments of this application provide an electronic device that includes a charge pump circuit as described in the first or second aspect above.

[0022] In embodiments of this application, the charge pump circuit includes an energy storage unit, a control unit, and a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch, all controlled by the control unit. The first, second, and third switches are connected in series, with the common terminal of the second and third switches serving as the first-stage voltage output terminal of the charge pump circuit. The fourth, sixth, and fifth switches are connected in series between the voltage input terminal and the second-stage voltage output terminal of the charge pump circuit. The first terminal of the energy storage unit is connected between the first and second switches, and the second terminal of the energy storage unit is connected to the common terminal of the third, fourth, and sixth switches. The first terminal of the seventh switch is connected between the first and second switches, and the second terminal of the seventh switch is connected between the fifth and sixth switches. Therefore, by reusing the first switch, the third switch, the energy storage unit, and the voltage output terminal of the first-stage voltage regulator, the voltage output terminal of the first-stage voltage regulator can be used as the voltage input terminal of the second-stage voltage regulator. Combined with the flexible control of the first to seventh switches, the energy storage unit can flexibly participate in the first and second-stage voltage regulation, achieving buck-boost voltage regulation control under different conditions. This allows the voltage signal input to the voltage input terminal of the charge pump circuit to be transformed, ultimately outputting a voltage four times or a quarter times the original input voltage signal, achieving second-stage voltage regulation output. Thus, a single charge pump circuit achieves both second-stage voltage regulation control and output, reducing the cost of circuit components.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of a circuit structure related to the charge pump circuit according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the circuit module structure for secondary voltage regulation using the relevant technologies involved in the charge pump circuit according to the embodiments of this application.

[0027] Figure 3 This is a schematic diagram of an optional circuit structure of a charge pump circuit according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the circuit structure of the charge pump circuit in buck mode according to an embodiment of this application;

[0029] Figure 5This is a schematic diagram of the circuit structure of the charge pump circuit in boost mode according to an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the circuit operation of the charge pump circuit in the first stage of the first-stage voltage reduction according to an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the second stage of operation of the charge pump circuit during the first-stage voltage reduction according to an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the circuit operation of the charge pump circuit in the third stage during the second-stage voltage reduction according to an embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the fourth stage of operation of the charge pump circuit during the second-stage voltage reduction according to an embodiment of this application.

[0034] Figure 10 This is a schematic diagram of the circuit operation of the charge pump circuit in the fifth stage during the first-stage voltage boost according to an embodiment of this application;

[0035] Figure 11 This is a schematic diagram of the sixth stage of operation of the charge pump circuit during the first-stage voltage boost according to an embodiment of this application.

[0036] Figure 12 This is a schematic diagram of the seventh stage of operation of the charge pump circuit according to an embodiment of this application during the second-stage voltage boost;

[0037] Figure 13 This is a schematic diagram of the circuit operation of the charge pump circuit in the eighth stage during the second-stage boost according to an embodiment of this application.

[0038] Figure label:

[0039] Control unit 10;

[0040] First switch S1; Second switch S2; Third switch S3; Fourth switch S4; Fifth switch S5; Sixth switch S6; Seventh switch S7; Energy storage unit Cfly; Battery B. Detailed Implementation

[0041] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0042] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0043] In the description of this application, it should be understood that the terms "center", "depth", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Please refer to Figure 1 , Figure 1 The diagram illustrates an optional circuit structure for a charge pump circuit in related technologies. This circuit utilizes a storage capacitor and four switching transistors to achieve voltage regulation, offering advantages such as high efficiency, low ripple, low noise, and low cost. Consequently, charge pump converters are widely used in electronic devices such as mobile phones and tablets.

[0045] Current charge pump circuits can only achieve single-stage voltage conversion, adjusting the voltage to twice or half the input voltage. However, in some implementation scenarios, two-stage voltage conversion is required, adjusting the voltage to one-quarter or four times the input voltage. In such cases, refer to... Figure 2 The setup involves using two charge pump circuits for voltage conversion. Therefore, to achieve two-stage voltage conversion, eight switching transistors and two energy storage capacitors are used, resulting in a large number of components and high circuit component costs.

[0046] To address the aforementioned technical problems, this application provides a charge pump circuit and an electronic device. The charge pump circuit provided in this application will be described below.

[0047] Please refer to Figure 3 ,in Figure 3 A schematic diagram of an optional structure of a charge pump circuit according to an embodiment of this application is shown. The charge pump circuit may include a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an energy storage unit Cfly, and a control unit 10.

[0048] The first switch S1 to the seventh switch S7 mentioned above can be a metal-oxide-semiconductor field-effect transistor (MOSFET). For example, the first switch S1 to the seventh switch S7 can all be N-type MOSFETs. In other examples, the first switch S1 to the seventh switch S7 mentioned above can also be other types of switching transistors, such as P-type MOSFETs.

[0049] The aforementioned energy storage unit Cfly can be used for storing and releasing electrical energy. For example, the aforementioned energy storage unit Cfly can be an energy storage capacitor. The aforementioned control unit 10 can be a drive circuit composed of a drive chip or discrete components.

[0050] The first switch S1, the second switch S2, and the third switch S3 are connected in series. The common terminal of the second switch S2 and the third switch S3 serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit.

[0051] For example, the first terminal of the first switch S1 can be connected to the first ground terminal, the second terminal of the first switch S1 can be connected to the first terminal of the second switch S2, and the second terminal of the second switch S2 can be connected to the first terminal of the third switch S3. The junction where the second terminal of the second switch S2 is connected to the first terminal of the third switch S3 can serve as the first-stage voltage output terminal of a charge pump circuit. This first-stage voltage output terminal can also be connected to the battery B of the electronic device.

[0052] The fourth switch S4, the sixth switch S6, and the fifth switch S5 are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulator of the charge pump circuit.

[0053] For example, the fourth switch S4, the sixth switch S6 and the fifth switch S5 can be connected in series.

[0054] In this embodiment, the charge pump circuit, acting as a DC-DC converter, can have a high-voltage side and a low-voltage side. It should be noted that when a voltage signal is applied to the high-voltage side, the charge pump circuit can perform buck conversion; when a voltage signal is applied to the low-voltage side, the charge pump circuit can perform boost conversion.

[0055] Please refer to the following: Figure 3 and Figure 4 When performing step-down conversion, i.e. when the charge pump circuit is in step-down mode, the second terminal of the fourth switch S4 is the voltage input terminal of the charge pump circuit, and the first terminal of the fifth switch S5 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

[0056] Please refer to the following: Figure 3 and Figure 5 When performing boost conversion, i.e. when the charge pump circuit is in boost mode, the first terminal of the fifth switch S5 is the voltage input terminal of the charge pump circuit, and the second terminal of the fourth switch S4 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

[0057] For example, the first end of the fifth switch S5 can be used as the low-voltage side of the charge pump circuit, the second end of the fifth switch S5 can be connected to the first end of the sixth switch S6, the second end of the sixth switch S6 can be connected to the first end of the fourth switch S4, and the second end of the fourth switch S4 can be used as the high-voltage side of the charge pump circuit.

[0058] Please continue reading. Figure 3 The first end of the energy storage unit Cfly can be connected between the first switch S1 and the second switch S2, and the second end of the energy storage unit Cfly can be connected to the common terminal of the third switch S3, the fourth switch S4 and the sixth switch S6.

[0059] The first end of the seventh switch S7 can be connected between the first switch S1 and the second switch S2, and the second end of the seventh switch S7 can be connected between the fifth switch S5 and the sixth switch S6.

[0060] The control terminals of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are connected to the control unit 10.

[0061] The control terminals of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, and the seventh switch S7 can be controlled by control signals respectively.

[0062] It should also be noted that, taking the first switch S1 to the seventh switch S7 as an example of an N-type MOSFET, the first terminal of each of the first switches S1 to the seventh switch S7 can be the source, each of the first switches S1 to the seventh switch S7 can be the drain, and the control terminal of each of the first switches S1 to the seventh switch S7 can be the gate.

[0063] This application embodiment is based on the charge pump circuit in related technologies. A fifth switch S5, a sixth switch S6, and a seventh switch S7, along with charging and discharging branches related to the fifth to seventh switches S7, are added to a charge pump circuit. This allows the first switch S1, the third switch S3, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulator to be reused when implementing voltage regulation control. A first voltage regulation module is formed by the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulator. The second voltage regulation module consists of switch S5, the sixth switch S6, the seventh switch S7, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulator. Therefore, during voltage regulation, the voltage output terminal of the first-stage regulator can serve as the voltage input terminal for the second-stage regulator. Combined with the flexible control of switches S1 to S7, the energy storage unit Cfly can flexibly participate in both first and second-stage voltage regulation, achieving buck-boost voltage regulation control under different conditions. Finally, the voltage signal input to the voltage input terminal of the charge pump circuit is transformed to output four or a quarter times the original input voltage signal, realizing the second-stage voltage regulation output. Therefore, second-stage voltage regulation control and output are achieved in a single charge pump circuit. Compared to related technologies that use two charge pump circuits, this reduces one switch and one capacitor, lowering the cost of circuit components.

[0064] Please continue reading. Figure 3 and Figure 4 In some alternative examples, the charge pump circuit described above may further include a battery B, and the voltage output terminal of the first-stage voltage regulator of the charge pump circuit may be connected to the positive terminal of the battery B. The first terminal of the first switch S1 is connected to the negative terminal of the battery B, and the second terminal of the first switch S1 is connected to the second switch S2.

[0065] When the charge pump circuit is in buck mode, the fourth switch S4 is connected to the voltage input terminal of the charge pump circuit, the fifth switch S5 is connected to the voltage output terminal of the second-stage voltage regulator of the charge pump circuit, and the sixth switch S6 is connected in series between the fourth switch S4 and the fifth switch S5.

[0066] In this example, by setting up battery B in the charge pump circuit and connecting the voltage output terminal of the first-stage voltage regulator to battery B, the DC voltage input to the voltage input terminal of the charge pump circuit connected to the fourth switch S4 can be stepped down in the step-down mode. The DC voltage after the first-stage step-down is then output to battery B through the voltage output terminal of the first-stage voltage regulator of the charge pump circuit. At this time, the DC voltage received by battery B is half of the input voltage.

[0067] Subsequently, the voltage of battery B is reused in the secondary voltage regulation circuit. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit is used as the voltage input terminal of the second-stage voltage reduction. After the second-stage voltage reduction, the voltage output terminal of the secondary voltage regulation of the charge pump circuit, which is connected to the fifth switch S5, is one-quarter of the original input DC voltage.

[0068] Please refer to Figure 3 and Figure 5 When the charge pump circuit is in boost mode, the fourth switch S4 is connected to the voltage output terminal of the secondary voltage regulator of the charge pump circuit, the fifth switch S5 is connected to the voltage input terminal of the charge pump circuit, and the sixth switch S6 is connected in series between the fourth switch S4 and the fifth switch S5.

[0069] In this example, by setting up battery B in the charge pump circuit and connecting the voltage output terminal of the first-stage voltage regulator to battery B, the DC voltage connected to the voltage input terminal of the charge pump circuit connected to the fifth switch S5 can be boosted in the boost mode. The voltage output terminal of the first-stage voltage regulator of the charge pump circuit can output DC power after the first-stage boost to battery B. At this time, the voltage of battery B is twice the input voltage.

[0070] Subsequently, the voltage of battery B is reused in the secondary voltage regulation circuit. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit is used as the voltage input terminal of the second-stage voltage boost. After the second-stage voltage boost, the voltage output terminal of the secondary voltage regulation of the charge pump circuit, which is finally connected to the fourth switch S4, is four times the DC voltage.

[0071] In these examples, the voltage output terminal of the first-stage voltage regulation and its connected battery B can be flexibly reused when the charge pump circuit is in different voltage regulation modes, thereby realizing the second-stage voltage regulation control and output in a single charge pump circuit.

[0072] Please refer to the following: Figures 3 to 4 ,as well as Figure 6 and Figure 7 In some alternative examples, when the charge pump circuit is in the first buck mode, the control unit 10 can control the fifth switch S5, the sixth switch S6 and the seventh switch S7 to be turned off.

[0073] The control unit 10 can also control the second switch S2 and the fourth switch S4 to be turned on during the first time period, and control the first switch S1 and the third switch S3 to be turned off. During the second time period, it controls the first switch S1 and the third switch S3 to be turned on, and controls the second switch S2 and the fourth switch S4 to be turned off.

[0074] It should be noted that the aforementioned first buck mode refers to the mode in which the charge pump circuit receives voltage from the high-voltage side, and then outputs a bucked voltage to battery B through the voltage output terminal of the first-stage voltage regulator of the charge pump circuit. The duration of the first time period and the duration of the second time period can be the same or approximately the same.

[0075] In this example, in the first buck mode, the fifth switch S5, the sixth switch S6, and the seventh switch S7 can be controlled to be normally off. When the charge pump circuit operates in this mode, it can be divided into two processing periods, during which the first switch S1, the third switch S3, the second switch S2, and the fourth switch S4 are alternately turned on.

[0076] For example, during a switching control cycle in which the control unit 10 controls the charge pump circuit to perform a first-stage voltage reduction, the duration of the enable signal from the control unit 10 for the first switch S1 and the third switch S3 may be the same as or approximately the same as the duration of the enable signal from the control unit 10 for the second switch S2 and the fourth switch S4.

[0077] Please refer to Figure 6 During the first time period, which is the first half of a switching control cycle of the first-stage step-down circuit, the second switch S2 and the fourth switch S4 are turned on, while the first switch S1, the third switch S3, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are turned off. At this time, the side of the charge pump circuit closest to the fourth switch S4 is connected to the input source, which supplies power to the energy storage unit Cfly and the battery B connected to the voltage output terminal of the first-stage voltage regulator of the charge pump circuit. During this stage, the voltage relationship of equation (1) exists.

[0078] V in =V c +V bat (1)

[0079] Among them, V in Vc is the input source voltage, Vc is the voltage across the energy storage unit Cfly, and Vo is the voltage across the battery B.

[0080] Please refer to Figure 7 During the second time period, which is the latter half of one switching control cycle of the first-stage step-down, the second switch S2 and the fourth switch S4 turn off, the first switch S1 and the third switch S3 turn on, and the fifth switch S5, the sixth switch S6 and the seventh switch S7 remain off. At this time, the energy storage unit Cfly supplies power to the load; the voltage relationship in this stage is as shown in equation (2).

[0081] V c =V bat (2)

[0082] According to equations (1) and (2) above, the relationship between the input voltage and the output voltage of the first-stage voltage regulator during the step-down process of the charge pump circuit is detailed in equation (3) below. This achieves the first-stage step-down conversion.

[0083] V bat =V in / twenty three)

[0084] In these embodiments, the battery B connected to the voltage output terminal of the first-stage voltage regulator is charged by the first-stage step-down of the charge pump circuit, thus realizing the first-stage step-down conversion.

[0085] In some optional examples, please continue reading. Figure 3 This can be the case where the voltage input terminal is the high-voltage side of the charge pump circuit and the high-voltage side has switched from a state where there is no voltage signal to a state where there is a voltage signal, in which case the charge pump circuit is in the first buck mode.

[0086] Taking a charge pump circuit applied to a mobile phone as an example, when the phone's charging port is connected to a charger, the charger rectifies the incoming AC power into DC. This DC signal can be used as an input source. If the input source is connected to the high-voltage side of the charge pump circuit, the high-voltage side switches from a state where there is no voltage to a state where there is a voltage signal. At this time, the charge pump circuit is in the first buck mode. For example, if the input source voltage is 16V, then the battery B voltage is 8V.

[0087] In some alternative examples, the charge pump circuit may be in the first buck mode when the control unit 10 receives a first-level buck control command from the user.

[0088] Please refer to Figures 6 to 9 Please refer to the following as well. Figures 3 to 4 In some alternative examples, when the charge pump circuit is in the second buck mode, the control unit 10 can control the second switch S2 and the fourth switch S4 to turn off and control the fifth switch S5 to turn on.

[0089] The control unit 10 can also control the third switch S3 and the seventh switch S7 to be turned on during the third time period, and control the first switch S1 and the sixth switch S6 to be turned off. During the fourth time period, it controls the first switch S1 and the sixth switch S6 to be turned on, and controls the third switch S3 and the seventh switch S7 to be turned off.

[0090] It should be noted that the aforementioned second buck mode can refer to a mode in which battery B is reused in the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit serves as the voltage input terminal of the secondary voltage regulation of the charge pump circuit, thereby causing the voltage output terminal of the secondary voltage regulation of the charge pump circuit to output the voltage after the secondary buck. The duration of the third time period and the duration of the fourth time period can be the same or approximately the same.

[0091] In this example, when performing a second-stage voltage reduction based on the first-stage voltage reduction, the second switch S2 and the fourth switch S4 are normally open, and the fifth switch S5 is normally closed. At this time, the voltage output terminal of the first-stage voltage regulation of the charge pump circuit serves as the voltage input terminal of the second-stage voltage regulation.

[0092] In this working mode, it can be divided into two processing periods, during which the third switch S3, the seventh switch S7, the first switch S1, and the sixth switch S6 are alternately turned on.

[0093] For example, during a switching control cycle in which the control unit 10 controls the charge pump circuit to perform a two-stage voltage reduction, the duration of the enable signal from the control unit 10 to the third switch S3 and the seventh switch S7 is the same as or approximately the same as the duration of the enable signal from the control unit 10 to the first switch S1 and the sixth switch S6.

[0094] Please refer to Figure 8 During the third time period, which is the first half of a switching control cycle of the secondary step-down circuit, switches S3, S5, and S7 are turned on, while switches S1, S2, S4, and S6 are turned off. At this time, the input source stops connecting, and the voltage output of the primary voltage regulator of the charge pump circuit becomes the voltage output of the secondary voltage regulator, allowing battery B to supply power to the energy storage unit Cfly and the voltage output of the secondary voltage regulator of the charge pump circuit. During this stage, the voltage relationship expressed in equation (4) exists.

[0095] V bat =V c +V PH (4)

[0096] Where Vbat is the voltage output of the first-stage voltage regulator of the charge pump circuit when connected to battery B, Vc is the voltage across the energy storage unit Cfly, and VPH is the load voltage when the voltage output of the second-stage voltage regulator of the charge pump circuit is connected to the load.

[0097] Please refer to Figure 9 During the fourth period, which is the latter half of a switching control cycle of the secondary step-down circuit, the first switch S1, the fifth switch S5, and the sixth switch S6 are turned on, while the second switch S2, the third switch S3, the fourth switch S4, and the seventh switch S7 are turned off, allowing the energy storage unit Cfly to supply power to the load. During this stage, the voltage relationship expressed in equation (5) exists.

[0098] V c =V PH (5)

[0099] According to equations (4) and (5) above, when the charge pump circuit performs two-stage step-down processing, the relationship between the output voltage of the second-stage voltage regulator and the output voltage of the first-stage voltage regulator is detailed in equation (6) below, thus realizing the two-stage step-down conversion.

[0100] V PH =V bat / 2 (6)

[0101] In these embodiments, the voltage reduction process via the charge pump circuit ensures that the load voltage is half the voltage of battery B connected to the voltage output terminal of the first-stage voltage regulator. Therefore, by combining the first-stage voltage reduction process with the second-stage voltage reduction, the first switch S1, the third switch S3, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulator are reused, reducing the number of electronic components and saving circuit costs. Furthermore, compared to the input source voltage, the voltage output terminal of the second-stage voltage regulator is reduced to one-quarter of the input source voltage, achieving a two-stage buck conversion.

[0102] In some optional examples, please continue reading. Figure 3 When the voltage input terminal is the high-voltage side of the charge pump circuit and the high-voltage side switches from a state with a voltage signal to a state without a voltage signal, the charge pump circuit is in the second buck mode.

[0103] Continuing with the example of a charge pump circuit applied to a mobile phone, when the phone's charging port is connected to a charger, the charger rectifies the incoming AC power into DC as its input source. If the input source is connected to the high-voltage side of the charge pump circuit, and the user unplugs the charger, the high-voltage side switches from a voltage-present state to a voltage-absent state, at which point the charge pump circuit enters its second buck mode. For example, when battery B has a voltage of 8V, it can step down to output 4V to power various circuits within the phone system.

[0104] Alternatively, the control unit 10 may also put the charge pump circuit into a second buck mode upon receiving a secondary buck control command from the user.

[0105] In some additional optional examples, please see Figure 10 and Figure 11 Please refer to the following as well. Figure 3 and Figure 5 When the charge pump circuit is in the first boost mode, the control unit 10 can control the second switch S2 and the fourth switch S4 to turn off, and control the fifth switch S5 to turn on.

[0106] The aforementioned control unit 10 can also be used to control the first switch S1 and the sixth switch S6 to be turned on during the fifth time period, and to control the third switch S3 and the seventh switch S7 to be turned off during the sixth time period.

[0107] It should be noted that the aforementioned first boost mode refers to the mode in which the charge pump circuit receives voltage from the low-voltage side, and then outputs the boosted voltage to battery B through the voltage output terminal of the first-stage voltage regulator of the charge pump circuit. The duration of the fifth and sixth time periods mentioned above can be the same or approximately the same.

[0108] In this example, during the first-stage boost, the second switch S2 and the fourth switch S4 are controlled to be normally off, and the fifth switch S5 is controlled to be normally closed. When the charge pump circuit operates in this mode, it can be divided into two processing periods, during which the first switch S1, the sixth switch S6, the third switch S3, and the seventh switch S7 are alternately turned on.

[0109] For example, within one switching control cycle corresponding to the charge pump circuit being controlled by the control unit 10 to perform a first-stage voltage boost, the duration of the enable signal from the control unit 10 to the first switch S1 and the sixth switch S6 is the same as or approximately the duration of the enable signal from the control unit 10 to the sixth switch S6 and the third switch S3.

[0110] Please refer to Figure 10 During the fifth time period, which is the first half of the switching control cycle corresponding to the first-stage boost, switches S1, S5, and S6 are turned on, while switches S2, S3, S4, and S7 are turned off. At this time, the side of the charge pump circuit closest to switch S5 is connected to the input source, which charges the energy storage unit Cfly. During this stage, the voltage relationship shown in equation (7) exists.

[0111] V in =V c (7)

[0112] Where Vin is the input source voltage, V c The voltage across the energy storage unit Cfly is denoted as .

[0113] Please refer to Figure 11During the sixth time period, which is the latter half of the switching control cycle corresponding to the first-stage boost, the first switch S1 and the sixth switch S6 are turned off, the third switch S3 and the seventh switch S7 are turned on, the second switch S2 and the fourth switch S4 remain off, and the fifth switch S5 remains on. The input source and the energy storage unit Cfly together supply electrical energy to the voltage output terminal of the first-stage voltage regulator of the charge pump circuit, thus charging the battery B connected to the first-stage voltage regulator. During this stage, the voltage relationship expressed in equation (2) exists.

[0114] V bat =V in +V c (8)

[0115] According to equations (7) and (8) above, the relationship between the input voltage and the output voltage of the first-stage voltage regulator during the boost process of the charge pump circuit is detailed in equation (9). This achieves the first-stage boost conversion.

[0116] V bat =2*V in (9)

[0117] In these embodiments, the energy storage unit Cfly is pre-charged, and then the energy storage unit Cfly, together with the input source, provides power to the voltage output terminal of the first-stage voltage regulator. As a result, the voltage output of the voltage output terminal of the first-stage voltage regulator is twice the input voltage, realizing a first-stage boost converter.

[0118] It should be noted that the charge pump circuit can be in the first boost mode when the voltage input terminal is the low-voltage side of the charge pump circuit and the low-voltage side has switched from a state where there is no voltage signal to a state where there is a voltage signal.

[0119] Taking a charge pump circuit applied to a mobile phone as an example, when the phone's charging port is connected to a charger, the charger rectifies the incoming AC power into DC. This DC signal can serve as an input source. If the input source is connected to the low-voltage side of the charge pump circuit, the low-voltage side switches from a state where there is no voltage to a state where a voltage signal is present, and the charge pump circuit is in its first boost mode. For example, if the input source voltage is 4V, then the battery B voltage is 8V.

[0120] In some alternative examples, the charge pump circuit may be in a first boost mode upon receiving a first boost command from the user.

[0121] Please refer to Figures 10 to 13 Please refer to the following as well. Figure 3 and Figure 5 When the charge pump circuit is in the second boost mode, the control unit 10 can control the fifth switch S5, the sixth switch S6 and the seventh switch S7 to be turned off.

[0122] The control unit 10 can control the first switch S1 and the third switch S3 to be turned on during the seventh time period, and control the second switch S2 and the fourth switch S4 to be turned off during the eighth time period.

[0123] It should be noted that the aforementioned second boost mode can refer to a mode in which battery B is reused in the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit serves as the voltage input terminal of the secondary voltage regulation of the charge pump circuit, thereby causing the voltage output terminal of the secondary voltage regulation of the charge pump circuit to output the voltage boosted by the secondary voltage. The duration of the seventh period is the same as or approximately the same as the duration of the eighth period.

[0124] In this example, when performing a second-stage voltage boost based on the first-stage voltage boost, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are normally open. At this time, the voltage output terminal of the first-stage voltage regulation of the charge pump circuit serves as the voltage input terminal of the second-stage voltage regulation.

[0125] In this working mode, it can be divided into two processing periods, during which the first switch S1, the third switch S3, the second switch S2, and the fourth switch S4 are alternately turned on.

[0126] For example, during a switching control cycle in which the control unit 10 controls the charge pump circuit to perform a two-stage boost, the duration of the enable signal from the control unit 10 to the first switch S1 and the third switch S3 is the same as or approximately the duration of the enable signal from the control unit 10 to the second switch S2 and the fourth switch S4.

[0127] Please refer to Figure 12 During the seventh time period, which is the first half of a switching control cycle of the second-stage boost circuit, the first switch S1 and the third switch S3 are turned on, while the second switch S2, the fourth switch S4, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are turned off. At this time, the input source stops connecting, and the voltage output terminal of the first-stage voltage regulation of the charge pump circuit becomes the voltage output terminal of the second-stage voltage regulation, enabling battery B to supply power to the energy storage unit Cfly. During this stage, the voltage relationship of equation (10) exists.

[0128] V bat =V c (10)

[0129] Where Vbat is the voltage at the first-stage voltage output terminal of the charge pump circuit when connected to battery B, and Vc is the voltage across the energy storage unit Cfly.

[0130] Please refer to Figure 13During the eighth time period, which is the latter half of a switching control cycle of the second-stage boost, the second switch S2 and the fourth switch S4 are turned on, while the first switch S1, the third switch S3, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are turned off. At this time, the fully charged energy storage unit Cfly and the voltage output terminal of the first-stage voltage regulator supply power to the load together. The voltage relationship in this stage is as shown in equation (11).

[0131] V PH =V bat +V c (11)

[0132] According to equations (10) and (11) above, when the charge pump circuit performs two-stage boosting, it first charges the energy storage unit Cfly, and then the energy storage unit Cfly, together with the voltage output terminal of the first-stage voltage regulator, provides power to the load. At this time, the relationship between the output voltage of the second-stage voltage regulator and the voltage output terminal of the first-stage voltage regulator is detailed in equation (12) below. Thus, two-stage boost conversion is realized.

[0133] V PH =2*V bat (6)

[0134] In these embodiments, the voltage boosting process via the charge pump circuit ensures that the load voltage is twice the voltage of battery B connected to the voltage output terminal of the first-stage voltage regulator. Therefore, by combining the first-stage boosting process with the second-stage voltage regulator, the first switch S1, the third switch S3, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulator are reused, reducing the number of electronic components and saving circuit costs. Furthermore, compared to the input source voltage, the voltage output terminal of the second-stage voltage regulator is increased to four times the input source voltage, achieving a two-stage boost conversion.

[0135] It should also be noted that when the voltage input terminal is the low-voltage side of the charge pump circuit and the low-voltage side switches from a state where a voltage signal exists to a state where no voltage signal exists, the charge pump circuit is in the second boost mode.

[0136] Continuing with the example of a charge pump circuit applied to a mobile phone, when the phone's charging port is connected to a charger, the charger rectifies the incoming AC power into DC as its input source. If the input source is connected to the low-voltage side of the charge pump circuit, and the user unplugs the charger, the low-voltage side switches from a voltage-present state to a voltage-absent state, at which point the charge pump circuit enters its second boost mode. For example, when battery B has a voltage of 8V, it can boost the output to 16V to power various circuits within the phone system.

[0137] Alternatively, in some alternative examples, the charge pump circuit may be in a second boost mode when the control unit 10 receives a second boost control command from the user.

[0138] Please continue reading. Figures 3 to 13 This application also provides a charge pump circuit, which includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an energy storage unit Cfly, and a control unit 10.

[0139] In this circuit, the first switch S1, the second switch S2, and the third switch S3 are connected in series. The common terminal of the second switch S2 and the third switch S3 serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit.

[0140] The fourth switch S4, the sixth switch S6, and the fifth switch S5 are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulator of the charge pump circuit.

[0141] The first end of the energy storage unit is connected between the first switch S1 and the second switch S2, and the second end of the energy storage unit is connected to the common end of the third switch S3, the fourth switch S4 and the sixth switch S6.

[0142] The first end of the seventh switch is connected between the first switch S1 and the second switch S2, and the second end of the seventh switch is connected between the fifth switch S5 and the sixth switch S6.

[0143] The control terminals of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, and the seventh switch are connected to the control unit 10.

[0144] When the charge pump circuit is in buck mode, the second terminal of the fourth switch S4 is the voltage input terminal of the charge pump circuit, and the first terminal of the fifth switch S5 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

[0145] When the charge pump circuit is in boost mode, the second terminal of the fourth switch S4 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit, and the first terminal of the fifth switch S5 is the voltage input terminal of the charge pump circuit.

[0146] The specific implementation and beneficial effects of the charge pump circuit in this example can be found in the charge pump circuit of the previous example, and will not be elaborated further here.

[0147] The above text combines Figures 1 to 13The present application describes in detail the charge pump circuit of the embodiments thereof. Based on this, the present application also protects an electronic device, which may be at least one of a wearable device, a camera, a mobile phone, a tablet computer, a television, and a display.

[0148] The electronic device may include a housing and a charge pump circuit disposed within the housing, the charge pump circuit being configured as the charge pump circuit of the above embodiments. The electronic device includes the charge pump circuit provided in the above embodiments, and therefore possesses all the beneficial effects of the aforementioned charge pump circuit.

[0149] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0150] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A charge pump circuit, characterized in that, It includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an energy storage unit, and a control unit; The first switch, the second switch, and the third switch are connected in series, and the common terminal of the second switch and the third switch serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit. The fourth switch, the sixth switch, and the fifth switch are connected in series between the voltage input terminal of the charge pump circuit and the voltage output terminal of the secondary voltage regulator of the charge pump circuit. The first end of the energy storage unit is connected between the first switch and the second switch, and the second end of the energy storage unit is connected to the common end of the third switch, the fourth switch and the sixth switch; The first end of the seventh switch is connected between the first switch and the second switch, and the second end of the seventh switch is connected between the fifth switch and the sixth switch; The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are connected to the control unit. It also includes a battery, and the voltage output terminal of the first-stage voltage regulator of the charge pump circuit is connected to the positive terminal of the battery; The first end of the first switch is connected to the negative terminal of the battery, and the second end of the first switch is connected to the second switch.

2. The charge pump circuit according to claim 1, characterized in that, When the charge pump circuit is in buck mode, the fourth switch is connected to the voltage input terminal of the charge pump circuit, the fifth switch is connected to the voltage output terminal of the secondary voltage regulator of the charge pump circuit, and the sixth switch is connected in series between the fourth switch and the fifth switch. When the charge pump circuit is in boost mode, the fourth switch is connected to the voltage output terminal of the secondary voltage regulator of the charge pump circuit, the fifth switch is connected to the voltage input terminal of the charge pump circuit, and the sixth switch is connected in series between the fourth switch and the fifth switch.

3. The charge pump circuit according to claim 1, characterized in that, When the charge pump circuit is in the first buck mode, the fifth switch, the sixth switch, and the seventh switch are controlled to be turned off. During the first time period, control the second switch and the fourth switch to be turned on, and control the first switch and the third switch to be turned off; During the second time period, the first switch and the third switch are turned on, and the second switch and the fourth switch are turned off. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit is the voltage output terminal when the charge pump circuit is in the first buck mode.

4. The charge pump circuit according to any one of claims 1 to 3, characterized in that, When the charge pump circuit is in the second buck mode, the second switch and the fourth switch are controlled to be turned off; Control the fifth switch to be turned on; During the third time period, the third switch and the seventh switch are controlled to be turned on, and the first switch and the sixth switch are controlled to be turned off. During the fourth time period, the first switch and the sixth switch are controlled to be turned on, and the third switch and the seventh switch are controlled to be turned off. The first terminal of the fifth switch is the voltage output terminal when the charge pump circuit is in the second buck mode, and the second terminal of the fifth switch is connected to the sixth switch.

5. The charge pump circuit according to claim 4, characterized in that, The duration of the third time period is the same as the duration of the fourth time period.

6. The charge pump circuit according to claim 1, characterized in that, When the charge pump circuit is in the first boost mode, the second switch and the fourth switch are controlled to be turned off; Control the fifth switch to be turned on; During the fifth time period, control the first switch and the sixth switch to be turned on, and control the third switch and the seventh switch to be turned off; During the sixth time period, the third and seventh switches are controlled to be turned on, and the first and sixth switches are controlled to be turned off. The voltage output terminal of the first-stage voltage regulator of the charge pump circuit is the voltage output terminal when the charge pump circuit is in the first boost mode.

7. The charge pump circuit according to claim 1, 2, or 6, characterized in that, When the charge pump circuit is in the second boost mode, the fifth switch, the sixth switch, and the seventh switch are controlled to be turned off; During the seventh time period, the first switch and the third switch are controlled to be turned on, and the second switch and the fourth switch are controlled to be turned off. During the eighth time period, control the second switch and the fourth switch to be turned on, and control the first switch and the third switch to be turned off; The first terminal of the fourth switch is connected to the sixth switch and the third switch, and the second terminal of the fourth switch is the voltage output terminal when the charge pump circuit is in the second boost mode.

8. The charge pump circuit according to claim 7, characterized in that, The duration of the seventh time period is the same as the duration of the eighth time period.

9. A charge pump circuit, characterized in that, It includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, and an energy storage unit; The first terminal of the first switch is connected to the first ground terminal and the negative terminal of the battery, and the second terminal of the first switch is connected to the first terminal of the second switch; The second terminal of the second switch is electrically connected to the first terminal of the third switch. The junction where the second terminal of the second switch and the first terminal of the third switch are connected serves as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit. The voltage output terminal of the first-stage voltage regulation of the charge pump circuit is connected to the positive terminal of the battery. The second end of the third switch is connected to the first end of the fourth switch and the second end of the sixth switch, and the first end of the sixth switch is connected to the second end of the fifth switch; The first end of the seventh switch is connected to the second end of the first switch and the first end of the second switch, and the second end of the seventh switch is connected to the second end of the fifth switch and the first end of the sixth switch; The first end of the energy storage unit is connected to the second end of the first switch and the first end of the second switch, and the second end of the energy storage unit is connected to the second end of the third switch, the first end of the fourth switch and the second end of the sixth switch; The control terminals of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, and the seventh switch are respectively connected to control signals; When the charge pump circuit is in buck mode, the second terminal of the fourth switch is the voltage input terminal of the charge pump circuit, and the first terminal of the fifth switch is the voltage output terminal of the secondary voltage regulation of the charge pump circuit. When the charge pump circuit is in boost mode, the second terminal of the fourth switch is the voltage output terminal of the secondary voltage regulation of the charge pump circuit, and the first terminal of the fifth switch is the voltage input terminal of the charge pump circuit.

10. An electronic device, characterized in that, The electronic device includes a charge pump circuit as described in any one of claims 1 to 9.

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