CN116191870A - Charge pump circuits and electronics - Google Patents

Abstract

The application discloses a charge pump circuit and electronic equipment, 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, and a control unit controlled by the control unit. The sixth switch and the seventh switch; the first switch, the second switch and the third switch are connected in series in sequence, and the common terminal of the first switch and the second switch is used 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 end of the charge pump circuit and the voltage output end of the secondary voltage regulation of the charge pump circuit; the first end of the energy storage unit is connected between the first switch and the second switch , 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 Connected between the fifth switch and the sixth switch.

Description

Charge pump circuits and electronics

technical field

The application belongs to the technical field of power electronics, and in particular relates to a charge pump circuit and electronic equipment.

Background technique

With the development of science and technology, electronic devices such as mobile phones have been used more and more widely. At present, electronic devices such as mobile phones generally use charge pump circuits to realize DC-DC voltage conversion.

When using a charge pump circuit to realize DC-DC voltage conversion, usually only one buck-boost can be achieved, that is, the DC voltage is adjusted to 1/2 or 2 times the input voltage. For example, the DC voltage of 16V can be converted into DC voltage of 8V by using the charge pump circuit, or the DC voltage of 8V can be converted into DC voltage of 16V.

If two steps of step-up and step-down are required, two charge pump circuits are required to perform voltage regulation sequentially. Specifically: it is necessary to use the charge pump circuit A to perform the first-stage voltage regulation, and then use the charge pump circuit B to perform the second-stage voltage regulation. Since two charge pump circuits need to be used when realizing the buck-boost twice, the cost is relatively high.

Contents of the invention

The present application aims to provide a charge pump circuit and electronic equipment, thereby providing a charge pump circuit supporting two-stage voltage regulation.

In the first aspect, the embodiment of the present application proposes 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;

Wherein, the first switch, the second switch and the third switch are connected in series in sequence, and the common terminal of the second switch and the third switch is used 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 regulation 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 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;

The control terminal of the first switch, the control terminal of the second switch, the control terminal of the third switch, the control terminal of the fourth switch, the control terminal of the fifth switch, the control terminal of the sixth switch and the control terminal of the seventh switch unit connection.

In the second aspect, the embodiment of the present application proposes 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;

The first terminal of the first switch is connected to the first ground terminal and the negative pole of the battery, and the second terminal of the first switch is connected to the first terminal of the second switch;

The second end of the second switch is electrically connected to the first end of the third switch, and the node connected between the second end of the second switch and the first end of the third switch is used as the voltage output end 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 pole 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 terminal of the energy storage unit is connected to the second terminal of the first switch and the first terminal of the second switch, and the second terminal of the energy storage unit is connected to the second terminal of the third switch, the first terminal of the fourth switch and the first terminal of the second switch. the second terminal of the six switches;

The control terminal of the first switch, the control terminal of the second switch, the control terminal of the third switch, the control terminal of the fourth switch, the control terminal of the fifth switch, the control terminal of the sixth switch and the control terminal of the seventh switch are connected respectively input control signal;

When the charge pump circuit is in the step-down mode, the second end of the fourth switch is the voltage input end of the charge pump circuit, and the first end of the fifth switch is the voltage output end of the secondary voltage regulation of the charge pump circuit;

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

In a third aspect, the embodiment of the present application provides an electronic device, and the electronic device includes the charge pump circuit in the first aspect or the second aspect.

In the embodiment of the present 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 first switch all controlled by the control unit. Seven switches; wherein, the first switch, the second switch and the third switch are connected in series in sequence, and the common terminal of the second switch and the third switch is used as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit; the fourth switch and the sixth switch The fifth switch is connected in series between the voltage input end of the charge pump circuit and the voltage output end of the secondary voltage regulation 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 energy storage The second terminal of the 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 to the Between the fifth switch and the sixth switch. Therefore, by multiplexing the first switch, the third switch, the energy storage unit and the voltage output end of the first-stage voltage regulation, the voltage output end of the first-stage voltage regulation can be used as the voltage input end of the second-stage voltage regulation, and cooperate with the first switch The flexible control to the seventh switch enables the energy storage unit to flexibly participate in the primary and secondary voltage regulation, and realize the voltage regulation control of step-up and down in different situations, thereby transforming the voltage signal input by the voltage input terminal of the charge pump circuit, In the end, the output can be four times or one quarter times the original input voltage signal, realizing a two-stage voltage regulation output. Therefore, the secondary voltage regulation control and output are realized by means of a single charge pump circuit, and the cost of circuit components is reduced.

Additional aspects and advantages of the 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 the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic circuit structure diagram of a related technology related to a charge pump circuit according to an embodiment of the present application;

Fig. 2 is a schematic diagram of the structure of the circuit module when performing two-stage voltage regulation according to the related technology involved in the charge pump circuit of the embodiment of the present application;

3 is a schematic diagram of an optional circuit structure of a charge pump circuit according to an embodiment of the present application;

4 is a schematic diagram of the circuit structure of the charge pump circuit according to an embodiment of the present application when it is in a step-down mode;

5 is a schematic diagram of the circuit structure of the charge pump circuit according to an embodiment of the present application when it is in boost mode;

FIG. 6 is a schematic diagram of the circuit operation in the first period of time when the charge pump circuit according to the embodiment of the present application performs a first-stage step-down;

FIG. 7 is a schematic diagram of the circuit operation of the charge pump circuit according to the embodiment of the present application during the second period of step-down;

FIG. 8 is a schematic diagram of the circuit operation of the charge pump circuit according to the embodiment of the present application in the third period when the charge pump circuit is performing two-stage step-down;

FIG. 9 is a schematic diagram of the circuit operation of the charge pump circuit according to the embodiment of the present application in the fourth period of time when the second-stage step-down is performed;

FIG. 10 is a schematic diagram of the circuit operation of the charge pump circuit according to the embodiment of the present application in the fifth period when the charge pump circuit is performing one-stage boosting;

11 is a schematic diagram of the circuit operation of the charge pump circuit according to the embodiment of the present application in the sixth period when the charge pump circuit is performing one-stage boosting;

FIG. 12 is a schematic diagram of circuit operation in the seventh period when the charge pump circuit according to the embodiment of the present application is performing two-stage boosting;

FIG. 13 is a schematic diagram of circuit operation in the eighth period when the charge pump circuit according to the embodiment of the present application is performing two-stage boosting.

Reference signs:

control unit 10;

The first switch S1; the second switch S2; the third switch S3; the fourth switch S4; the fifth switch S5; the sixth switch S6; the seventh switch S7; the energy storage unit Cfly;

Detailed ways

Embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the 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 by referring to the figures are exemplary, are only for explaining the present application, and should not be construed as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The features of the terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

In the description of this application, it is to be understood that the terms "center", "depth", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than Nothing to indicate or imply that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the application.

Please refer to FIG. 1. FIG. 1 shows a schematic diagram of an optional circuit structure of a charge pump (Charge pump) circuit in the related art. High, low ripple, low noise and low cost. As a result, charge pump converters are widely used in electronic devices such as mobile phones and tablet computers.

The current charge pump circuit can only achieve one-stage conversion, that is, after the adjustment of the charge pump circuit, the voltage is adjusted to twice or half of the input voltage. However, in some implementation scenarios, it is necessary to implement two-stage voltage conversion, that is, to adjust the voltage to a quarter or four times the input voltage. At this time, it can be set with reference to Figure 2, that is, two charge pump circuits are used for voltage conversion. Therefore, when realizing two-stage voltage conversion, 8 switch tubes and 2 energy storage capacitors are used. There are many devices and the cost of circuit devices is relatively low. high.

In order to solve the above technical problems, embodiments of the present application provide a charge pump circuit and an electronic device. The charge pump circuit provided in the embodiment of the present application will be described first below.

Please refer to FIG. 3 , where FIG. 3 shows a schematic structural diagram of an optional charge pump circuit according to an embodiment of the present application. 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 .

The above-mentioned first switch S1 to the seventh switch S7 may be Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), for example, the first switch S1 to the seventh switch S7 may be N-type MOSFETs. In other examples, the above-mentioned first switch S1 to seventh switch S7 may also be other types of switch tubes, such as P-type MOSFETs.

The energy storage unit Cfly can be used to store and release electric energy. Exemplarily, the energy storage unit Cfly can be an energy storage capacitor. The aforementioned control unit 10 may be a driver chip or a driver circuit composed of discrete components.

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

Exemplarily, the first end of the first switch S1 may be connected to the first ground end, the second end of the first switch S1 may be connected to the first end of the second switch S2, and the second end of the second switch S2 may be connected to the first ground end. The first end of the third switch S3 is connected. Wherein, the node where the second end of the second switch S2 is connected to the first end of the third switch S3 can be used as the voltage output end of the first-stage voltage regulation of the charge pump circuit. The voltage output end of the first-stage voltage regulation can also be connected with the battery B of the electronic device.

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 regulation of the charge pump circuit.

Exemplarily, the above-mentioned fourth switch S4, sixth switch S6 and fifth switch S5 may be connected in series in sequence.

In an embodiment, the charge pump circuit may have a high voltage side and a low voltage side as a DC-DC converter. It should be noted that when a voltage signal is connected to the high-voltage side, the charge pump circuit can realize step-down conversion; when a voltage signal is connected to the low-voltage side, the charge pump circuit can realize step-up conversion.

Please refer to Fig. 3 and Fig. 4 together. When step-down conversion is performed, that is, when the charge pump circuit is in step-down mode, the second end of the fourth switch S4 is the voltage input end of the charge pump circuit, and the fifth switch The first terminal of S5 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

Please refer to Fig. 3 and Fig. 5 together. When boost conversion is performed, that is, when the charge pump circuit is in boost mode, the first end of the fifth switch S5 is the voltage input end of the charge pump circuit, and the fourth switch The second terminal of S4 is the voltage output terminal of the secondary voltage regulation of the charge pump circuit.

Exemplarily, 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, and the second end of the sixth switch S6 It may be connected to the first terminal of the fourth switch S4, and the second terminal of the fourth switch S4 may serve as the high voltage side of the charge pump circuit.

Please continue to refer to FIG. 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 electrically connected to the third switch S3, the fourth switch S4 and The common terminal of the sixth switch S6.

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

The control terminal of the first switch S1, the control terminal of the second switch S2, the control terminal of the third switch S3, the control terminal of the fourth switch S4, the control terminal of the fifth switch S5, the control terminal of the sixth switch S6 and the seventh The control terminal of the switch S7 is connected with the control unit 10 .

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

It should also be noted that the first switch S1 to the seventh switch S7 are N-type MOSFETs for illustration, the first terminals of the first switch S1 to the seventh switch S7 can all be sources, and the first switches S1 to S7 All the seventh switches S7 may be drains, and the control terminals of the first switch S1 to the seventh switch S7 may be gates.

The embodiment of the present application is based on the charge pump circuit in the related art, adding the fifth switch S5, the sixth switch S6 and the seventh switch S7 and the related functions of the fifth switch S5 to the seventh switch S7 in a charge pump circuit The charging and discharging branch makes it possible to reuse the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output end of the first-stage voltage regulation when realizing voltage regulation control, and 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 end of the first-stage voltage regulation form the first voltage regulation module, with the first switch S1, the third switch S3, the fifth switch S5, and the sixth switch S6 , the seventh switch S7, the energy storage unit Cfly, and the voltage output terminal of the first-stage voltage regulation form the second voltage regulation module, so that when the voltage regulation conversion is performed, the voltage output terminal of the first-stage voltage regulation can be used as the second voltage regulation module. The voltage input terminal, together with the flexible control of the first switch S1 to the seventh switch S7, enables the energy storage unit Cfly to flexibly participate in the primary and secondary voltage regulation, and realizes the step-up and step-down voltage regulation control in different situations, and finally the charge pump circuit The voltage signal input at the voltage input terminal can be converted to output four times or one quarter of the original input voltage signal, realizing a two-stage voltage regulation output. Therefore, the two-level voltage regulation control and output are realized in a single charge pump circuit. Compared with the solution of using two charge pump circuits in the related art, one switch and one capacitor are reduced, and the cost of circuit components is reduced.

Please continue to refer to FIG. 3 and FIG. 4 , in some optional examples, the above-mentioned charge pump circuit may further include a battery B, and the voltage output terminal of the first-stage voltage regulation of the above-mentioned charge pump circuit may be connected to the positive pole of the battery B. A first end of the first switch S1 is connected to the negative pole of the battery B, and a second end of the first switch S1 is connected to the second switch S2.

When the charge pump circuit is in the step-down 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 secondary voltage regulation of the charge pump circuit, and the sixth switch S6 is connected in series Between the fourth switch S4 and the fifth switch S5.

In this example, by setting the battery B in the charge pump circuit and connecting the voltage output terminal of the first-stage voltage regulator to the battery B, when the charge pump circuit is in the step-down mode, the voltage connected to the fourth switch S4 can be The DC voltage input by the voltage input terminal of the charge pump circuit is step-down, and the DC voltage after the step-down is output to the battery B through the voltage output terminal of the charge pump circuit. At this time, the battery B receives The DC voltage is one-half times the input voltage.

Subsequently, the battery B voltage is reused to multiplex the battery B to the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit is used as the voltage input terminal of the secondary step-down. After the secondary step-down, Finally, the output voltage of the voltage output end of the secondary voltage regulator of the charge pump circuit connected to the fifth switch S5 is 1/4 times of the original input DC voltage.

And please refer to Fig. 3 and Fig. 5, in the case that the charge pump circuit is in boost mode, the fourth switch S4 is connected to the voltage output terminal of the secondary voltage regulation of the charge pump circuit, and the fifth switch S5 is connected to the voltage output terminal of the charge pump circuit The input terminals are connected, and the sixth switch S6 is connected in series between the fourth switch S4 and the fifth switch S5.

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

The voltage of the battery B is subsequently reused to reuse the battery B to the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit is used as the voltage input terminal of the secondary boost. After the secondary boost, Finally, the output voltage of the voltage output end of the secondary voltage regulator of the charge pump circuit connected to the fourth switch S4 is four times of the DC voltage.

In these examples, when the charge pump circuit is in different voltage regulation modes, the voltage output terminal of the primary voltage regulation and its connected battery B can be flexibly multiplexed, thereby realizing the secondary voltage regulation control in a single charge pump circuit and the output.

Please refer to FIGS. 3 to 4, and FIGS. 6 and 7. In some optional examples, when the charge pump circuit is in the first step-down mode, the above-mentioned control unit 10 can control the fifth switch S5, the sixth switch S6 and the seventh switch S7 are turned off.

The above-mentioned control unit 10 may also control the second switch S2 and the fourth switch S4 to be turned on, and control the first switch S1 and the third switch S3 to be turned off within the first period of time. In the second period, the first switch S1 and the third switch S3 are controlled to be turned on, and the second switch S2 and the fourth switch S4 are controlled to be turned off.

It should be noted that the above-mentioned first step-down mode may refer to a mode in which the charge pump circuit outputs a stepped-down voltage to the battery B through the voltage output terminal of the first-stage voltage regulation of the charge pump circuit after inputting a voltage from the high voltage side. The duration of the first period and the duration of the second period may be consistent or similar.

In this example, the fifth switch S5 , the sixth switch S6 and the seventh switch S7 may be controlled to be in a normally-off state in the first step-down mode. When the charge pump circuit works in this mode, it can be divided into two processing periods, in which the first switch S1, the third switch S3, the second switch S2, and the fourth switch S4 are turned on alternately.

Exemplarily, it may be that within a switch control cycle in which the control unit 10 controls the charge pump circuit to perform one-stage step-down, the first switch S1 and the third switch S3 are controlled by the duration of the enable signal of the control unit 10 and the second switch S2 , The duration of the enable signal of the fourth switch S4 by the control unit 10 is consistent or similar.

Please refer to Fig. 6, in the first period, which is the first half period of a switch control cycle of the first-stage step-down, the second switch S2 and the fourth switch S4 are turned on, and the first switch S1 and 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 close to the fourth switch S4 is connected to the input source, and the input source supplies power to the energy storage unit Cfly and the battery B connected to the voltage output end of the first-stage voltage regulation of the charge pump circuit. At this stage, the voltage relationship of the following formula (1) exists.

V _in =V _c +V _bat (1)

Wherein, _Vin is the input source voltage, Vc is the voltage across the energy storage unit Cfly, and Vo is the voltage across the battery B.

Please refer to FIG. 7 , in the second period, which is the second half period of a switch control cycle of the first-stage step-down, the second switch S2 and the fourth switch S4 are turned off, and the first switch S1 and the second switch The third switch S3 is turned on, and the fifth switch S5 , the sixth switch S6 and the seventh switch S7 are still turned off. At this time, the energy storage unit Cfly supplies power to the load; at this stage, the voltage relationship of the following formula (2) exists.

V _c = V _bat (2)

According to the above formulas (1) and (2), it can be seen that when the charge pump circuit performs step-down processing, the relationship between the input voltage and the output voltage at the voltage output terminal of the first-stage voltage regulation is shown in the following formula (3). Thus, the first-stage step-down conversion is realized.

V _bat =V _in /2 (3)

In these embodiments, the first-stage step-down of the charge pump circuit charges the battery B connected to the voltage output terminal of the first-stage voltage regulation, thereby realizing the first-stage step-down conversion.

In some optional examples, please continue to refer to FIG. 3 , when the voltage input terminal is the high-voltage side of the charge pump circuit and the high-voltage side is switched from a state of no voltage signal to a state of a voltage signal, the charge pump circuit is in the first state. A step-down mode.

Take the charge pump circuit applied to the mobile phone as an example. When the charging port of the mobile phone is connected to the charger, the charger will rectify the connected mains power into DC. The 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 of no voltage to a state of a voltage signal, and the charge pump circuit is in the first step-down mode. Exemplarily, if the voltage of the input source is 16V, the voltage of the battery B is 8V at this time.

In some other optional examples, the charge pump circuit may be in the first step-down mode when the control unit 10 receives a level-1 step-down control instruction from a user.

Please refer to FIG. 6 to FIG. 9, and please refer to FIG. 3 to FIG. 4 together. In some other optional examples, when the charge pump circuit is in the second step-down mode, the control unit 10 can control the second switch S2 and the fourth switch S4 is turned off, and the fifth switch S5 is controlled to be turned on.

The control unit 10 may also control the third switch S3 and the seventh switch S7 to be turned on, and control the first switch S1 and the sixth switch S6 to be turned off in the third time period. In the fourth time period, the first switch S1 and the sixth switch S6 are controlled to be turned on, and the third switch S3 and the seventh switch S7 are controlled to be turned off.

It should be noted that the above-mentioned second step-down mode may mean that the battery B is multiplexed to the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit is used as the voltage input terminal of the secondary voltage regulation of the charge pump circuit. Furthermore, the voltage output end of the secondary voltage regulator of the charge pump circuit outputs a voltage after the secondary step-down. The duration of the third period may be the same as or similar to the duration of the fourth period.

In this example, when performing a second-stage step-down on the basis of the first-stage step-down, the second switch S2 and the fourth switch S4 are in the normally-off state, and the fifth switch S5 is in the normally-off state. At this time, the charge pump circuit The voltage output end of the first-stage voltage regulation is used as the voltage input end of the second-stage voltage regulation.

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

Exemplarily, it may be that within a switch control cycle in which the control unit 10 controls the charge pump circuit to perform two-stage step-down, the third switch S3 and the seventh switch S7 are controlled by the duration of the enable signal of the control unit 10 and the first switch S1 , The duration of the enabling signal of the sixth switch S6 by the control unit 10 is consistent or similar.

Please refer to FIG. 8 , during the third period, which is the first half period of a switch control cycle of the secondary step-down, the third switch S3, the fifth switch S5 and the seventh switch S7 are turned on, and the first switch S1 , the second switch S2 , the fourth switch S4 and the sixth switch S6 are turned off. At this time, the input source stops connecting, and the voltage output end of the first-stage voltage regulation of the charge pump circuit is used as the voltage output end of the second-stage voltage regulation, so that the battery B can provide the energy storage unit Cfly and the voltage of the second-stage voltage regulation of the charge pump circuit. The output is powered. At this stage, the voltage relationship of the following formula (4) exists.

V _bat =V _c +V _PH (4)

Among them, Vbat is the voltage when the voltage output end of the first-stage voltage regulation of the charge pump circuit is connected to battery B, Vc is the voltage at both ends of the energy storage unit Cfly, and VPH is the voltage output end of the second-stage voltage regulation of the charge pump circuit when it is connected to the load load voltage.

Please refer to Fig. 9, in the fourth period, which is the second half period of a switch control cycle of the secondary step-down, the first switch S1, the fifth switch S5 and the sixth switch S6 are turned on, and the second switch S2, the third switch S3, the fourth switch S4 and the seventh switch S7 are turned off, and the energy storage unit Cfly can supply power to the load. At this stage, the voltage relationship of the following formula (5) exists.

V _c =V _PH (5)

According to the above formulas (4) and (5), it can be seen that when the charge pump circuit performs two-stage step-down processing, the relationship between the output voltage of the voltage output terminal of the secondary voltage regulation and the voltage output terminal of the primary voltage regulation is shown in the following formula (6 ), thereby realizing a two-stage step-down conversion.

V _PH = V _bat /2 (6)

In these embodiments, the voltage of the load is half of the voltage of the battery B connected to the voltage output end of the first-stage voltage regulation through the step-down processing of the charge pump circuit. In this case, the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output terminal of the first-stage voltage regulation are reused, which reduces the number of electronic components and saves the cost of circuit components. Moreover, compared with the voltage of the input source, the voltage at the output terminal of the two-stage voltage regulator is reduced to a quarter of the voltage of the input source, realizing a two-stage step-down conversion.

In some optional examples, please continue to refer to FIG. 3, when the voltage input end is the high voltage side of the charge pump circuit and the high voltage side is switched from a state with a voltage signal to a state without a voltage signal, the charge pump circuit is in the second state. buck mode.

Continue to use the example of a charge pump circuit applied to a mobile phone. When the charging port of the mobile phone is connected to a charger, the charger will rectify the connected mains power into DC as an input source. If the input source is connected to the high-voltage side of the charge pump circuit, and the user unplugs the charger at this time, the high-voltage side switches from a state of voltage presence to a state of no voltage signal, and the charge pump circuit is in the second step-down mode at this time. Exemplarily, when the voltage of the battery B is 8V, it can output a voltage of 4V by stepping down to supply power to various circuits in the mobile phone system.

Alternatively, the control unit 10 may also put the charge pump circuit in the second step-down mode when receiving a second step-down control instruction from the user.

In some alternative examples, please refer to FIG. 10 and FIG. 11 , and please refer to FIG. 3 and FIG. 5 together. 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 are turned off, and the fifth switch S5 is controlled to be turned on.

The above-mentioned control unit 10 can also be used to control the first switch S1 and the sixth switch S6 to be turned on, and control the third switch S3 and the seventh switch S7 to be turned off in the fifth time period. In the sixth period, the third switch S3 and the seventh switch S7 are controlled to be turned on, and the first switch S1 and the sixth switch S6 are controlled to be turned off.

It should be noted that the above-mentioned first boosting mode may refer to a mode in which the charge pump circuit outputs a boosted voltage to the battery B through the voltage output terminal of the first-stage voltage regulation of the charge pump circuit after inputting a voltage from the low voltage side. The duration of the fifth period and the duration of the sixth period may be consistent or similar.

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

Exemplarily, it may be that in one switch control cycle corresponding to the control unit 10 controlling the charge pump circuit to perform a stage boost, the first switch S1 and the sixth switch S6 are controlled by the duration of the enable signal of the control unit 10 and the sixth The duration of the enable signal of the switch S6 and the third switch S3 is the same or similar to that of the control unit 10 .

Please refer to Fig. 10, in the fifth period, which is the first half period of the switch control cycle corresponding to the first stage boost, the first switch S1, the fifth switch S5 and the sixth switch S6 are turned on, and the second switch S2, the third switch S3, the fourth switch S4 and the seventh switch S7 are turned off. At this time, the side of the charge pump circuit close to the fifth switch S5 is connected to the input source, and the input source charges the energy storage unit Cfly. At this stage, the voltage relationship of the following formula (7) exists.

V _in =V _c (7)

Wherein, Vin is the input source voltage, and V _c is the voltage at both ends of the energy storage unit Cfly.

Please refer to FIG. 11. In the sixth period, which is the second half period of the switch control period corresponding to the first-stage boost, the first switch S1 and the sixth switch S6 are turned off, and the third switch S3 and the The seventh switch S7 is turned on, the second switch S2 and the fourth switch S4 are still turned off, and the fifth switch S5 is still turned on. The input source and the energy storage unit Cfly output electric energy to the voltage output terminal of the first-stage voltage regulation of the charge pump circuit, that is, charge the battery B connected to the first-stage voltage regulation. At this stage, the voltage relationship of the following formula (2) exists.

V _bat =V _in +V _c (8)

According to the above equations (7) and (8), it can be seen that when the charge pump circuit performs boost processing, the relationship between the input voltage and the output voltage at the voltage output terminal of the first-stage voltage regulation is shown in the following equation (9). Thus, the first-stage boost conversion is realized.

V _bat =2*V _in (9)

In these embodiments, the energy storage unit Cfly is charged in advance, and then the energy storage unit Cfly is combined with the input source to provide electric energy to the voltage output terminal of the first-stage voltage regulation, and the output from the voltage output terminal of the first-stage voltage regulation The voltage is twice the input voltage, realizing a one-stage boost conversion.

It should be noted that the charge pump circuit may be in the first boost mode when the voltage input end is the low voltage side of the charge pump circuit and the low voltage side is switched from a state of no voltage signal to a state of a voltage signal.

Take the charge pump circuit applied to a mobile phone as an example. When the charging port of the mobile phone is connected to a charger, the charger will rectify the connected mains power into DC. The DC signal can be used 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 of no voltage to a state of a voltage signal, and the charge pump circuit is in the first boost mode. Exemplarily, if the voltage of the input source is 4V, the voltage of the battery B is 8V at this time.

In some other optional examples, the charge pump circuit may be in the first boosting mode when receiving a first-stage boosting instruction from a user.

Please refer to FIG. 10 to FIG. 13, and please also refer to FIG. 3 and FIG. 5. When the charge pump circuit is in the second boost mode, the above-mentioned control unit 10 can control the fifth switch S5, the sixth switch S6 and the sixth switch S5. The seven switch S7 is turned off.

The control unit 10 can control the first switch S1 and the third switch S3 to turn on in the seventh period, control the second switch S2 and the fourth switch S4 to turn off, and control the second switch S2 and the fourth switch in the eighth period S4 is turned on, and controls the first switch S1 and the third switch S3 to be turned off.

It should be noted that the above-mentioned second boost mode may mean that the battery B is multiplexed to the secondary voltage regulation circuit, and the voltage output terminal of the primary voltage regulation of the charge pump circuit is used as the voltage input terminal of the secondary voltage regulation of the charge pump circuit. Furthermore, the voltage output terminal of the secondary voltage regulator of the charge pump circuit outputs the voltage after secondary boosting. The duration of the seventh period is the same as or similar to the duration of the eighth period.

In this example, the fifth switch S5, the sixth switch S6, and the seventh switch S7 are in the normally-off state when the second-stage boost is performed on the basis of the first-stage boost. At this time, the first-stage voltage regulation of the charge pump circuit The voltage output terminal is used as the voltage input terminal of the secondary voltage regulator.

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

Exemplarily, it may be that within a switch control cycle in which the control unit 10 controls the charge pump circuit to perform secondary boosting, the first switch S1 and the third switch S3 are controlled by the duration of the enable signal of the control unit 10 and the second switch S2 , The duration of the enable signal of the fourth switch S4 by the control unit 10 is consistent or similar.

Please refer to Fig. 12, in the seventh period, which is the first half period of a switch control cycle of the secondary boost, the first switch S1 and the third switch S3 are turned on, the second switch S2, the fourth switch The switch S4, the fifth switch S5, the sixth switch S6 and the seventh switch S7 are turned off. At this time, the input source is stopped, and the voltage output end of the first-stage voltage regulation of the charge pump circuit is used as the voltage output end of the second-stage voltage regulation, so that the battery B can supply power to the energy storage unit Cfly. At this stage, the voltage relationship of the following formula (10) exists.

V _bat = V _c (10)

Wherein, Vbat is the voltage when the voltage output terminal of the first-stage voltage regulation of the charge pump circuit is connected to the battery B, and Vc is the voltage at both ends of the energy storage unit Cfly.

Please refer to Fig. 13, in the eighth period, which is the second half period of a switch control cycle of the secondary boost, the second switch S2 and the fourth switch S4 are turned on, and the first switch S1 and 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 end of the first-stage voltage regulation are used to supply power to the load together. At this stage, the voltage relationship of the following formula (11) exists.

V _PH =V _bat +V _c (11)

According to the above formulas (10) and (11), it can be seen that when the charge pump circuit is performing two-stage boosting processing, the energy storage unit Cfly is charged in advance, and then the energy storage unit Cfly is combined with the voltage output terminal of the first-stage voltage regulation together. Provide power to the load. At this time, the relationship between the output voltage of the voltage output terminal of the secondary voltage regulation and the voltage output terminal of the primary voltage regulation is shown in the following formula (12). Thus, a two-stage boost conversion is realized.

V _PH ＝2*V _bat (6)

In these embodiments, the boosting process of the charge pump circuit makes the load voltage twice the voltage of the battery B connected to the voltage output terminal of the first-stage voltage regulator. In the case of multiplexing the first switch S1, the third switch S3, the energy storage unit Cfly and the voltage output terminal of the first-stage voltage regulation, the number of electronic components is reduced, and the cost of circuit components is saved. Moreover, compared with the voltage of the input source, the voltage at the output terminal of the two-stage voltage regulator increases to four times the voltage of the input source, realizing a two-stage boost conversion.

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 the state of voltage signal presence to the state of no voltage signal presence, the charge pump circuit is in the second boost mode.

Continue to use the example of a charge pump circuit applied to a mobile phone. When the charging port of the mobile phone is connected to a charger, the charger will rectify the connected mains power into DC as an input source. If the input source is connected to the low-voltage side of the charge pump circuit, and the user unplugs the charger at this time, the low-voltage side switches from the state of voltage presence to the state of no voltage signal, and the charge pump circuit is in the second boost mode. . Exemplarily, when the voltage of the battery B is 8V, the boosted output voltage of 16V can be used to supply power to various circuits in the mobile phone system.

Or, in some optional examples, the charge pump circuit may be in the second boost mode when the control unit 10 receives a user's secondary boost control instruction.

Please continue to refer to FIG. 3 to FIG. 13 , the present application also provides a charge pump circuit, the charge pump circuit includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a The six switches S6, the seventh switch S7, the energy storage unit Cfly and the control unit 10.

Wherein, the first switch S1, the second switch S2 and the third switch S3 are serially connected in series, and the common terminal of the second switch S2 and the third switch S3 is used as the voltage output terminal of the first-stage voltage regulation of the charge pump circuit.

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 regulation of the charge pump circuit.

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.

A first end of the seventh switch is connected between the first switch S1 and the second switch S2, and a second end of the seventh switch is connected between the fifth switch S5 and the sixth switch S6.

The control terminal of the first switch S1, the control terminal of the second switch S2, the control terminal of the third switch S3, the control terminal of the fourth switch S4, the control terminal of the fifth switch S5, the control terminal of the sixth switch S6 and the seventh The control terminal of the switch is connected with the control unit 10 .

When the charge pump circuit is in the step-down mode, the second end of the fourth switch S4 is the voltage input end of the charge pump circuit, and the first end of the fifth switch S5 is the voltage output end of the secondary voltage regulation of the charge pump circuit .

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

For the specific implementation manner and beneficial effect of the charge pump circuit in this example, reference may be made to the charge pump circuit in the foregoing examples, and details will not be repeated here.

The charge pump circuit of the embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 13 . On this basis, the embodiment of the present application also protects an electronic device, and the electronic device may be at least one of a wearable device, a camera, a mobile phone, a tablet computer, a television, and a display.

Wherein the electronic device may include a casing and a charge pump circuit disposed in the casing, and the charge pump circuit may be configured as the charge pump circuit of the above-mentioned embodiments. The electronic equipment includes the charge pump circuit provided by the above embodiment, so the electronic equipment has all the beneficial effects of the above charge pump circuit.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations 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 any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the application is defined by the claims and their equivalents.

Claims (10)

1. A charge pump circuit, characterized in that it comprises 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; Wherein, the first switch, the second switch and the third switch are serially connected in series, and the common terminal of the second switch and the third switch is used as the voltage output of the first-stage voltage regulation of the charge pump circuit end; 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 regulation 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 third switch, the fourth switch, and the first switch. The common terminal of the six switches; 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; The control terminal of the first switch, the control terminal of the second switch, the control terminal of the third switch, the control terminal of the fourth switch, the control terminal of the fifth switch, the control terminal of the sixth switch The control terminal of the switch and the control terminal of the seventh switch are connected to the control unit. 2. The charge pump circuit according to claim 1, further comprising a battery, and the voltage output terminal of the first-stage voltage regulation of the charge pump circuit is connected to the positive pole of the battery; The first end of the first switch is connected to the negative pole of the battery, and the second end of the first switch is connected to the second switch; When the charge pump circuit is in the step-down mode, the fourth switch is connected to the voltage input terminal of the charge pump circuit, and the fifth switch is connected to the voltage output of the secondary voltage regulation of the charge pump circuit terminal connection, 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 regulator of the charge pump circuit, and the fifth switch is connected to the voltage input terminal of the charge pump circuit The terminals are connected, 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, wherein when the charge pump circuit is in the first step-down mode, the fifth switch, the sixth switch and the seventh switch are controlled. switch off; controlling the second switch and the fourth switch to be turned on, and controlling the first switch and the third switch to be turned off during the first period; controlling the first switch and the third switch to be turned on, and controlling the second switch and the fourth switch to be turned off during the second period; 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 step-down mode. 4. The charge pump circuit according to any one of claims 1 to 3, wherein when the charge pump circuit is in the second step-down mode, the second switch and the fourth switch are controlled due; controlling the fifth switch to be turned on; controlling the third switch and the seventh switch to be turned on, and controlling the first switch and the sixth switch to be turned off during the third period; controlling the first switch and the sixth switch to be turned on, and controlling the third switch and the seventh switch to be turned off during the fourth period of time; The first end of the fifth switch is a voltage output end when the charge pump circuit is in the second step-down mode, and the second end of the fifth switch is connected to the sixth switch. 5. The charge pump circuit according to claim 4, wherein the duration of the third period is the same as the duration of the fourth period. 6. The charge pump circuit according to claim 1, wherein when the charge pump circuit is in the first boost mode, the second switch and the fourth switch are controlled to be turned off; controlling the fifth switch to be turned on; controlling the first switch and the sixth switch to be turned on, and controlling the third switch and the seventh switch to be turned off during the fifth period; controlling the third switch and the seventh switch to be turned on, and controlling the first switch and the sixth switch to be turned off during the sixth period; The voltage output end of the first-stage voltage regulation of the charge pump circuit is the voltage output end when the charge pump circuit is in the first boost mode. 7. The charge pump circuit according to claim 1, 2 or 6, wherein when the charge pump circuit is in the second boost mode, the fifth switch, the sixth switch and the the seventh switch is turned off; controlling the first switch and the third switch to be turned on, and controlling the second switch and the fourth switch to be turned off during the seventh period; controlling the second switch and the fourth switch to be turned on, and controlling the first switch and the third switch to be turned off during the eighth period; The first end of the fourth switch is connected to the sixth switch and the third switch, and the second end of the fourth switch is a voltage output end when the charge pump circuit is in the second boost mode. 8. The charge pump circuit according to claim 7, wherein the duration of the seventh period is the same as the duration of the eighth period. 9. A charge pump circuit, characterized in that it comprises 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 pole 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, and the node connected between the second terminal of the second switch and the first terminal of the third switch is used as the charge pump The voltage output end of the first-stage voltage regulation of the circuit, the voltage output end of the first-stage voltage regulation of the charge pump circuit is connected to the positive pole of the battery; The second terminal of the third switch is connected to the first terminal of the fourth switch and the second terminal of the sixth switch, and the first terminal of the sixth switch is connected to the second terminal of the fifth switch. connect; 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 connected to 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 terminal of the fourth switch and the second terminal of the sixth switch; The control terminal of the first switch, the control terminal of the second switch, the control terminal of the third switch, the control terminal of the fourth switch, the control terminal of the fifth switch, the control terminal of the sixth switch The control terminal of the control terminal and the control terminal of the seventh switch are respectively connected to control signals; When the charge pump circuit is in the step-down mode, the second end of the fourth switch is the voltage input end of the charge pump circuit, and the first end of the fifth switch is the voltage input end of the charge pump circuit. The voltage output terminal of the secondary voltage regulator; 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 The voltage input terminal of the charge pump circuit described above. 10. An electronic device, characterized in that the electronic device comprises the charge pump circuit according to any one of claims 1 to 9.

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