CN117614268B

CN117614268B - Power management circuit, power management chip and electronic equipment

Info

Publication number: CN117614268B
Application number: CN202410076329.XA
Authority: CN
Inventors: 黄宗伟; 米鑫涛; 蔡昭晨
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2024-01-18
Filing date: 2024-01-18
Publication date: 2024-05-10
Anticipated expiration: 2044-01-18
Also published as: CN117614268A

Abstract

The application discloses a power management circuit, a power management chip and electronic equipment, and relates to the technical field of circuits. The power management circuit comprises a first voltage transformation module, a second voltage transformation module, a first voltage stabilizing module, a diode, a control module and a second voltage stabilizing module. The first voltage transformation module is connected with the first voltage stabilizing module in series, and the second voltage transformation module is connected with the second voltage stabilizing module in series. The diode is connected between the input end of the first voltage stabilizing module and the input end of the second voltage stabilizing module. The control module is connected in series between the second voltage transformation module and the second voltage stabilization module so as to cut off the cathode of the diode from the output end of the second voltage transformation module when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state. Therefore, the abnormal voltage of the output end of the first voltage transformation module can be prevented, and the service life of the electronic equipment is prolonged.

Description

Power management circuit, power management chip and electronic equipment

Technical Field

The present application relates to the field of circuit technologies, and in particular, to a power management circuit, a power management chip, and an electronic device.

Background

In electronic devices such as mobile phones, tablet computers, notebook computers, etc., the energy storage module needs to supply power to a plurality of loads through a power management circuit. Generally, a power management circuit includes a first voltage transformation module, a second voltage transformation module, a first voltage stabilizing module, and a second voltage stabilizing module. The output end of the first voltage transformation module is connected with the input end of the first voltage stabilization module to form a power supply passage, and the output end of the second voltage transformation module is connected with the input end of the second voltage stabilization module to form another power supply passage. The energy storage module may supply power to one or more loads through a power supply path.

In the related art, the input terminal of the first voltage stabilizing module and the input terminal of the second voltage stabilizing module are also connected together through a diode. However, in this case, when the first voltage transformation module is in the working state and the second voltage transformation module is not in the working state, the output end of the first voltage transformation module is communicated with the ground wire through the diode and the second voltage transformation module, which can cause abnormal voltage at the output end of the first voltage transformation module and affect the service life of the electronic device.

Disclosure of Invention

The application provides a power management circuit, a power management chip and electronic equipment, which can solve the problem of abnormal voltage at the output end of a first voltage transformation module in the related technology, thereby prolonging the service life of the electronic equipment. The technical scheme is as follows:

in a first aspect, a power management circuit is provided. The power management circuit comprises a first voltage transformation module, a second voltage transformation module, a first voltage stabilizing module, a first diode, a control module and a second voltage stabilizing module.

The input end of the first transformation module is used for being connected with the energy storage unit. The output end of the first voltage transformation module is connected with the input end of the first voltage stabilizing module. The output end of the first voltage stabilizing module is used for being connected with a load so as to supply power to the load. That is, the first voltage transformation module and the first voltage stabilizing module are connected in series to form a power supply path. The first transformer module also has a detection end. The detection end of the first transformation module is connected with the output end of the first transformation module. The first transformation module is used for: when the voltage of the output end of the first voltage transformation module is detected to be smaller than a first preset voltage, the voltage of the output end of the first voltage transformation module is increased; when the voltage of the output end of the first voltage transformation module is detected to be larger than the first preset voltage, the voltage of the output end of the first voltage transformation module is reduced.

The input end of the second transformation module is used for being connected with the energy storage unit. The output end of the second transformation module is connected with the first end of the control module. The second end of the control module is connected with the input end of the second voltage stabilizing module. The output end of the second voltage stabilizing module is used for being connected with a load so as to supply power to the load. That is, the second voltage transformation module, the control module and the second voltage stabilizing module are connected in series to form another power supply path. The second voltage transformation module comprises a first switch connected between the output end of the second voltage transformation module and the ground wire. The first switch is a normally closed switch. That is, when the second voltage transformation module is in the inactive state, the first switch is turned on.

The anode of the first diode is connected with the output end of the first voltage transformation module and the input end of the first voltage stabilizing module, and the cathode of the first diode is connected with the second end of the control module and the input end of the second voltage stabilizing module. Wherein, control module is used for: when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state, the cathode of the first diode and the output end of the second voltage transformation module are cut off.

In an embodiment of the application, the power management circuit comprises a first voltage transformation module, a second voltage transformation module, a first voltage stabilizing module, a first diode, a control module and a second voltage stabilizing module. The first voltage transformation module and the first voltage stabilizing module are connected in series to form a power supply passage, and the second voltage transformation module and the second voltage stabilizing module are connected in series to form another power supply passage. The first diode is connected between the input end of the first voltage stabilizing module and the input end of the second voltage stabilizing module. The control module is connected in series between the second voltage transformation module and the second voltage stabilization module so as to cut off the cathode of the first diode and the output end of the second voltage transformation module when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state. Under the condition, when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state, the output end of the first voltage transformation module cannot be communicated with the ground wire through the first diode and the second voltage transformation module. Therefore, the abnormal voltage of the output end of the first voltage transformation module can be prevented, and the service life of the electronic equipment is prolonged.

In some embodiments, the first voltage transformation module may be a buck conversion circuit, a boost conversion module, or a bi-directional buck-boost conversion circuit. The second voltage transformation module may be a buck conversion circuit.

In some embodiments, the second voltage transformation module is a buck conversion circuit. In this case, the second transformation module further includes a second switch and an inductor. The first end of the second switch is used for being connected with the energy storage module. The second end of the second switch is connected with the first end of the first switch and the first end of the inductor. The second end of the first switch is used for being connected with the ground wire. The second end of the inductor is connected with the first end of the control module.

The structure of the control module is described below from two possible implementations.

In a first possible implementation manner, the control module is a unidirectional conduction module, and the first end of the control module is an input end and the second end of the control module is an output end.

In this case, in some possible embodiments, the control module comprises a second diode. The anode of the second diode is connected with the output end of the second transformation module. The cathode of the second diode is connected with the input end of the second voltage stabilizing module and the cathode of the first diode.

In other possible embodiments, the control module includes a voltage follower. The input end of the voltage follower is connected with the output end of the second transformation module. The output end of the voltage follower is connected with the input end of the second voltage stabilizing module and the cathode of the first diode.

In a second possible implementation, the control module is a bidirectional conduction module. In this case, the control module includes a switching unit. The first end of the switch unit is connected with the output end of the second transformation module. The second end of the switch unit is connected with the input end of the second voltage stabilizing module and the cathode of the first diode. The switch unit is turned off when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state; the switch unit is conducted when the second voltage transformation module is in a working state. Therefore, on one hand, when the second voltage transformation module is in a non-working state, the switch unit is turned off, so that the output end of the first voltage transformation module cannot be communicated with the ground wire through the first diode and the second voltage transformation module. On the other hand, when the second voltage-transformation module is in a working state, if the load connected with the second voltage-stabilization module is used for reducing the pumping load of the voltage and the current, the redundant voltage and the redundant current in the second voltage-stabilization module can flow back to the second voltage-transformation module, so that the occurrence of oscillation current is avoided.

Further, the control module may also include a processing unit. The output end of the processing unit is connected with the control end of the switch unit. The processing unit is used for: when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state, outputting a first level signal to a control end of the switch unit, wherein the first level signal is used for controlling the switch unit to be turned off; when the second voltage transformation module is in a working state, a second level signal is output to the control end of the switch unit, and the second level signal is used for controlling the switch unit to be conducted.

In some possible embodiments, the switching unit comprises a transistor. The first pole of the transistor is connected with the output end of the second voltage transformation module. The second pole of the transistor is connected with the input end of the second voltage stabilizing module and the cathode of the first diode. The control electrode of the transistor is connected with the output end of the processing unit.

In other possible embodiments, the switching unit comprises a load switch. The first end of the load switch is connected with the output end of the second transformation module. The second end of the load switch is connected with the input end of the second voltage stabilizing module and the cathode of the first diode. And the control end of the load switch is connected with the output end of the processing unit.

In a second aspect, there is also provided a power management chip comprising a power management circuit as in any one of the first aspects.

In some embodiments, the power management chip further includes a package structure. The power management circuit is encapsulated by the encapsulation structure.

In a third aspect, there is also provided an electronic device comprising an energy storage module, and a power management circuit as in any of the first aspects or a power management chip as in any of the second aspects.

In some embodiments, the electronic device further comprises a first load and a second load. The first load is connected with the output end of the first voltage stabilizing module, and the second load is connected with the output end of the second voltage stabilizing module.

The technical effects obtained by the second and third aspects are similar to the technical effects obtained by the corresponding technical means in the first aspect, and are not described in detail herein.

Drawings

Fig. 1 is an external view schematically showing a first electronic device in the related art;

fig. 2 is an external view schematically showing a second electronic device in the related art;

Fig. 3 is an internal structural view of an electronic device in the related art;

FIG. 4 is a graph showing voltage change in an ideal state in the related art;

FIG. 5 is a leakage path diagram of a power management circuit according to the related art;

Fig. 6 is a voltage change diagram in the actual state in the related art;

FIG. 7 is a block diagram of a first power management circuit according to an embodiment of the present application;

FIG. 8 is a block diagram of a second power management circuit according to an embodiment of the present application;

Fig. 9 is a block diagram of a third power management circuit according to an embodiment of the present application;

FIG. 10 is a circuit diagram of a voltage follower provided by an embodiment of the present application;

FIG. 11 is a block diagram of a fourth power management circuit provided by an embodiment of the present application;

Fig. 12 is a block diagram of a fifth power management circuit according to an embodiment of the present application;

fig. 13 is a block diagram of a sixth power management circuit according to an embodiment of the present application;

fig. 14 is a block diagram of a seventh power management circuit provided in an embodiment of the present application;

fig. 15 is a circuit diagram of a load switch according to an embodiment of the present application;

FIG. 16 is a circuit diagram of a first transformer module according to an embodiment of the present application;

FIG. 17 is a circuit diagram of a second first transformer module according to an embodiment of the present application;

Fig. 18 is a block diagram of an eighth power management circuit provided by an embodiment of the present application;

fig. 19 is an internal structural diagram of an electronic device according to an embodiment of the present application.

Wherein, the meanings represented by the reference numerals are respectively as follows:

Related technology:

10. An electronic device; 110. an energy storage module; 120. a power management circuit; 122. a first transformation module; 124. a first voltage stabilizing module; 126. a second transformation module; 128. a second voltage stabilizing module; 132. a first load; 134. a second load;

The application comprises the following steps:

20. A power management circuit; 210. a first transformation module; 212. a first controller; 220. a first voltage stabilizing module; 230. a second transformation module; 232. a second controller; 240. a second voltage stabilizing module; 250. a control module; 252. a voltage follower; 254. a switching unit; 255. a load switch; 256. a processing unit; 30. an electronic device; 32. an energy storage module; 312. a first load; 314. and a second load.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that references to "a plurality" in this disclosure refer to two or more. In the description of the present application, "/" means or, unless otherwise indicated, for example, A/B may represent A or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and function. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

Before explaining the power management circuit provided by the embodiment of the application in detail, an application scenario and related technologies of the power management circuit are described.

The electronic device 10 includes a smart watch, a cell phone, a tablet computer, a notebook computer, etc. Fig. 1 and 2 are external views of two different electronic devices 10 in the related art. In the embodiment shown in fig. 1, the electronic device 10 is a mobile phone; in the embodiment shown in fig. 2, the electronic device 10 is a tablet computer. Generally, the electronic device 10 generally includes a power management chip, which includes a package structure and a power management circuit enclosed by the package structure. In the electronic device 10, the energy storage module is required to supply power to a plurality of loads through a power management circuit. The plurality of loads may be, for example, a display screen of the electronic device 10, a System On Chip (SOC), or the like.

Specifically, fig. 3 is a schematic diagram of the internal structure of an electronic device 10 in the related art. As shown in fig. 3, the power management circuit 120 generally includes a plurality of voltage transformation modules and a plurality of voltage stabilizing modules. The voltage transformation modules and the voltage stabilizing modules are correspondingly connected in series one by one to form a plurality of power supply paths. The energy storage module 110 is capable of powering one or more loads through a power path. For example, in the embodiment shown in fig. 3, the illustrated power management circuit 120 includes a first voltage transformation module 122, a second voltage transformation module 126, a first voltage regulation module 124, and a second voltage regulation module 128. The output terminal b of the first voltage transformation module 122 and the input terminal a of the first voltage stabilizing module 124 are connected to form a power supply path. The input a of the first transformation module 122 is connected to the energy storage module 110. The output b of the first voltage stabilizing module 124 is connected to a first load 132. In this manner, the energy storage module 110 may supply power to the first load 132 through the first voltage transformation module 122 and the first voltage stabilizing module 124. Similarly, the output terminal b of the second voltage transformation module 126 and the input terminal a of the second voltage stabilizing module 128 are connected to form another power supply path. The input a of the second transformation module 126 is connected to the energy storage module 110. The output b of the second voltage stabilizing module 128 is connected to a second load 134. In this manner, the energy storage module 110 may supply power to the second load 134 through the second voltage transformation module 126 and the second voltage stabilizing module 128.

The first transformer module 122 also has a detection end c. The detection end c of the first voltage transformation module 122 is connected to the output end b of the first voltage transformation module 122, and is used for detecting the voltage of the output end b of the first voltage transformation module 122. The first voltage transformation module 122 may be used to output a first preset voltage when operating, where the first preset voltage is a preset voltage value, and the first preset voltage is equal to a rated voltage when the first load 132 is operating. In this case, if the detection terminal c of the first voltage transformation module 122 detects that the voltage at the output terminal b of the first voltage transformation module 122 is less than the first preset voltage, the first voltage transformation module 122 may increase the voltage at the output terminal b thereof. Conversely, if the detection end c of the first voltage transformation module 122 detects that the voltage of the output end b of the first voltage transformation module 122 is greater than the first preset voltage, the first voltage transformation module 122 may reduce the voltage of the output end b thereof. The second voltage transformation module 126 may also have a detection terminal (not shown in the figure) to detect the voltage at the output terminal b of the second voltage transformation module 126. The second voltage transformation module 126 may be configured to output a second preset voltage when operated, where the second preset voltage is equal to the rated voltage of the second load 134 when operated.

In operation of the electronic device 10, the voltage at the output b of the first transformer module 122 and the voltage at the output b of the second transformer module 126 may be varied as shown in fig. 4. In the embodiment shown in fig. 4, the abscissa is time T; the ordinate is the voltage V; curve ① is the voltage change curve of the output terminal b of the first voltage transformation module 122 in the ideal state; curve ② is the voltage change curve of the output terminal b of the second voltage transformation module 126 in the ideal state; the first preset voltage is V1; the second preset voltage is V2. As shown in fig. 4, in an ideal state, before the time T1, neither the first transformation module 122 nor the second transformation module 126 operates, and the voltage at the output terminal b of the first transformation module 122 and the voltage at the output terminal b of the second transformation module 126 are both 0. At time T1, the first voltage transformation module 122 starts to operate, and at this time, the voltage at the output terminal b of the first voltage transformation module 122 gradually increases. At time T2, the voltage at the output terminal b of the first voltage transformation module 122 increases to the first preset voltage V1, and the voltage at the output terminal b of the first voltage transformation module 122 is not increased any more and remains at V1. At time T3, the second voltage transformation module 126 starts to operate, and the voltage at the output terminal b of the second voltage transformation module 126 gradually increases. At time T4, the voltage at the output terminal b of the second voltage transformation module 126 increases to the second preset voltage V2, and the voltage at the output terminal b of the second voltage transformation module 126 is not increased any more and remains at V2.

However, in the related art, as shown in fig. 3, the input terminal a of the first voltage stabilizing module 124 and the input terminal a of the second voltage stabilizing module 128 are also connected together through a diode D1. In this case, when the first transformer module 122 is in the working state and the second transformer module 126 is not in the working state, the output terminal b of the first transformer module 122 is connected to the ground line through the diode D1 and the second transformer module 126, so as to form a leakage path from the output terminal b of the first transformer module 122 to the ground line.

Specifically, fig. 5 is a leakage path diagram of the power management circuit 120 in the related art. As shown in fig. 5, the second transformation module 126 generally includes a first switch Q1 and a first inductor L1. The second end of the first inductor L1 is the output end b of the second transformer module 126. The first end of the first switch Q1 is connected to the first end of the first inductor L1, and the second end of the first switch Q1 is connected to the ground GND. The first switch Q1 is a normally closed switch. That is, when the second voltage transformation module 126 is not in the operating state, the first switch Q1 is continuously in the closed and conductive state. Based on this, when the first voltage transformation module 122 is in the working state and the second voltage transformation module 126 is not in the working state, the output terminal b of the first voltage transformation module 122 is communicated with the ground GND through the diode D1, the first inductor L1 and the first switch Q1 to form a leakage path. In the embodiment shown in fig. 5, the leakage paths are marked with solid lines E1, E2, E3, E4 with arrows.

In this case, when the electronic device 10 is operated, in an actual state, the voltage change at the output terminal b of the first transformation module 122 and the voltage change at the output terminal b of the second transformation module 126 may be as shown in fig. 6. In the embodiment shown in fig. 6, the abscissa is time T; the ordinate is the voltage V; curve ① is a voltage change curve of the output terminal b of the first voltage transformation module 122 in an actual state; curve ② is the voltage change curve of the output terminal b of the second voltage transformation module 126 in the actual state; the first preset voltage is V1; the second preset voltage is V2. As shown in fig. 6, in the actual state, before the time T1, neither the first voltage transformation module 122 nor the second voltage transformation module 126 operates, and at this time, the voltage at the output terminal b of the first voltage transformation module 122 and the voltage at the output terminal b of the second voltage transformation module 126 are both 0. At time T1, the first voltage transformation module 122 starts to operate, and at this time, the voltage at the output terminal b of the first voltage transformation module 122 gradually increases. At time T2, the voltage at the output terminal b of the first voltage transformation module 122 increases to the first preset voltage V1, however, since the second voltage transformation module 126 is not in the working state, a leakage path exists in the power management circuit 120, so that the voltage detected by the detection terminal c of the first voltage transformation module 122 is smaller than the first preset voltage V1, and therefore the voltage at the output terminal b of the first voltage transformation module 122 continues to increase. At time T21, the voltage at the output terminal b of the first voltage transformation module 122 increases to the maximum value V3 of the output voltage of the first voltage transformation module 122, and at this time, the voltage at the output terminal b of the first voltage transformation module 122 is not increased any more and remains at V3. At time T3, the second voltage transformation module 126 starts to operate, and the voltage at the output terminal b of the second voltage transformation module 126 gradually increases. Meanwhile, since the second transforming module 126 starts outputting the voltage, the leakage path disappears, in which case the voltage detected by the detecting terminal c of the first transforming module 122 is greater than the first preset voltage V1, and thus the voltage of the output terminal b of the first transforming module 122 starts decreasing. At time T4, the voltage at the output terminal b of the second voltage transformation module 126 increases to the second preset voltage V2, and the voltage at the output terminal b of the second voltage transformation module 126 is not increased any more and remains V2; the voltage at the output terminal b of the first voltage transformation module 122 decreases to the first preset voltage V1, and the voltage at the output terminal b of the first voltage transformation module 122 is not decreased any more and remains V1.

As can be seen from comparing fig. 4 and fig. 6, due to the leakage path, the voltage at the output terminal b of the first voltage transformation module 122 is abnormal between the time T2 and the time T4, and the voltage at the output terminal b of the first voltage transformation module 122 is greater than the preset first preset voltage. This may cause damage to the electronic components in the first voltage regulator and the first load 132, affecting the useful life of the electronic device 10.

Therefore, the embodiment of the application provides a power management circuit, a power management chip and electronic equipment, which can solve the problem of abnormal voltage at the output end of a first voltage transformation module in the related technology, thereby prolonging the service life of the electronic equipment.

The power management circuit provided by the embodiment of the application is explained in detail below. The power management circuit provided by the embodiment of the application can be directly applied to the electronic device 10 shown in fig. 1 and 2, and can also be packaged into a power management chip and applied to the electronic device 10 shown in fig. 1 and 2. In the present embodiment, the connection between two electronic components (or the electrical module, the electrical unit) refers to the electrical connection. The electrical connection here means that two electronic components are connected to each other to transmit an electrical signal. The electrical connection between the two electronic components may be direct connection via a wire or indirect connection via other electronic components.

Fig. 7 is a block diagram of a power management circuit 20 according to an embodiment of the present application. As shown in fig. 7, the power management circuit 20 includes a first voltage transformation module 210, a second voltage transformation module 230, a first voltage stabilizing module 220, a first diode D1, a control module 250, and a second voltage stabilizing module 240.

The first transformation module 210 has an input terminal a, an output terminal b, and a detection terminal c. The input terminal a of the first voltage transformation module 210 is used for being connected with the energy storage module, and the output terminal b of the first voltage transformation module 210 is connected with the input terminal a of the first voltage stabilizing module 220. The first voltage transformation module 210 is used for performing voltage transformation on the dc power output by the energy storage module, and outputting the dc power after voltage transformation to the first voltage stabilizing module 220. For example, the first voltage transformation module 210 may be a buck conversion (buck) circuit for stepping down the direct current, a boost conversion (boost) circuit for stepping up the direct current, or a bi-directional buck-boost conversion (buck-boost) circuit. The detection end c of the first voltage transformation module 210 is connected to the output end b of the first voltage transformation module 210, and is used for detecting the voltage of the output end b of the first voltage transformation module 210. In an embodiment of the present application, the first voltage transformation module 210 may be used to output a first preset voltage during operation. The first preset voltage is a voltage value preset by a person skilled in the art. When the detection end c of the first voltage transformation module 210 detects that the voltage of the output end b of the first voltage transformation module 210 is smaller than the first preset voltage, the first voltage transformation module 210 can increase the voltage of the output end b thereof; conversely, when the detection terminal c of the first voltage transformation module 210 detects that the voltage of the output terminal b of the first voltage transformation module 210 is greater than the first preset voltage, the first voltage transformation module 210 may decrease the voltage of the output terminal b thereof, so that the voltage of the output terminal b of the first voltage transformation module 210 is maintained at the first preset voltage.

The first voltage stabilizing module 220 also has an output b. The output b of the first voltage stabilizing module 220 is configured to connect to one or more loads in the electronic device. That is, the first transformation module 210 and the first voltage stabilizing module 220 are connected in series to form a power supply path for supplying power to the load. Taking this power supply path for supplying power to the first load as an example, the first preset voltage may be equal to the rated voltage of the first load when it is operated. Here, the first load may be any one of an SOC, a display screen, a speaker, a microphone, a camera, a motor, a sensor, and the like. The SOC includes a central processing unit (central processing unit, CPU), a graphics processor (graphics processing unit, GPU), a baseband, and the like. The sensors include pressure sensors, gyroscopic sensors, barometric sensors, magnetic sensors, acceleration sensors, distance sensors, proximity sensors, fingerprint sensors, temperature tactiles, touch sensors, ambient light sensors, bone conduction sensors, and the like. The first voltage stabilizing module 220 is used for stabilizing the dc power output by the first voltage transforming module 210 when operating. For example, the first voltage regulator 220 may be a low dropout linear regulator (low dropout regulator, LDO).

The second transformation module 230 has an input a and an output b. The input terminal a of the second voltage transformation module 230 is used for being connected with the energy storage module, and the output terminal b of the second voltage transformation module 230 is connected with the first terminal a of the control module 250. The second voltage transformation module 230 is used for performing voltage transformation on the dc power output by the energy storage module, and outputting the dc power after voltage transformation to the second voltage stabilizing module 240 through the control module 250. Here, as shown in fig. 7, the second voltage transformation module 230 includes a first switch Q1 connected between the output terminal b of the second voltage transformation module 230 and the ground GND, and the first switch Q1 is a normally closed switch. That is, when the second voltage transformation module 230 is in the inactive state, the first switch Q1 is turned on, and the output terminal b of the second voltage transformation module 230 is turned on with the ground GND. For example, the second transformation module 230 may be a buck circuit. In the embodiment of the present application, the second voltage transformation module 230 may be used to output a second preset voltage when working. The second preset voltage is a voltage value preset by a person skilled in the art.

The second terminal b of the control module 250 is connected to the input terminal a of the second voltage stabilizing module 240. That is, the control module 250 is connected in series between the second voltage transformation module 230 and the second voltage stabilizing module 240, and is used for controlling the on-off of the circuit between the output terminal b of the second voltage transformation module 230 and the input terminal a of the second voltage stabilizing module 240.

The output terminal b of the second voltage stabilizing module 240 is used for connecting with another one or more loads in the electronic device. The "another load or loads" herein are with respect to the "load or loads" to which the output terminal b of the first voltage stabilizing module 220 is connected. That is, the second voltage transformation module 230, the control module 250, and the second voltage stabilizing module 240 are connected in series to form another power supply path for supplying power to the load. Taking this supply path for supplying power to the second load as an example, the second preset voltage may be equal to the rated voltage of the second load when it is operating. The second voltage stabilizing module 240 is configured to stabilize the dc voltage output by the second voltage transforming module 230 during operation. For example, the second voltage regulator module 240 may be a low dropout linear voltage regulator.

In the embodiment of the present application, a first diode D1 is further connected between the input terminal a of the first voltage stabilizing module 220 and the input terminal a of the second voltage stabilizing module 240. That is, the anode of the first diode D1 is connected to the output terminal b of the first voltage transformation module 210 and the input terminal a of the first voltage stabilizing module 220, and the cathode of the first diode D1 is connected to the second terminal b of the control module 250 and the input terminal a of the second voltage stabilizing module 240. Based on this, to avoid the first transformation module 210 being in an operating state and the second transformation module 230 being in an inactive state forming a leakage path, the control module 250 is configured to: when the first voltage transformation module 210 is in an operating state and the second voltage transformation module 230 is in a non-operating state, the cathode of the first diode D1 is cut off from the output terminal b of the second voltage transformation module 230. In this case, when the first transformer module 210 is in the operating state and the second transformer module 230 is in the non-operating state, the output terminal b of the first transformer module 210 cannot be connected to the ground GND through the first diode D1 and the second transformer module 230. In this way, the voltage at the output terminal b of the first voltage transformation module 210 can be prevented from being abnormal, thereby improving the service life of the electronic device. Based on this, in the power management circuit 20 provided in the embodiment of the present application, the voltage change at the output terminal b of the first voltage transformation module 210 and the voltage change at the output terminal b of the second voltage transformation module 230 may be as shown in fig. 4.

The structure of the control module 250 is explained in detail below from two possible implementations with reference to the accompanying drawings.

1. In a first possible implementation, the control module 250 is a unidirectional conduction module, and the first end a of the control module 250 is an input end and the second end b of the control module 250 is an output end.

In this possible implementation, the control module 250 is a unidirectional conduction module, so that the cathode of the first diode D1 is always turned off from the output b of the second voltage transformation module 230, and the output b of the second voltage transformation module 230 is always turned on from the cathode of the first diode D1. This is illustrated from two possible embodiments below.

1. In one possible embodiment, the control module 250 includes a diode.

Fig. 8 is a block diagram of another power management circuit 20 according to an embodiment of the present application. As shown in fig. 8, the control module 250 may include a second diode D2. The anode of the second diode D2 is connected to the output terminal b of the second transformation module 230. The cathode of the second diode D2 is connected to the input terminal a of the second voltage stabilizing module 240 and the cathode of the first diode D1. In this case, the cathode of the first diode D1 is always turned off from the output terminal b of the second transformation module 230 based on the reverse turn-off characteristic of the second diode D2. Therefore, when the first voltage transformation module 210 is in the operating state and the second voltage transformation module 230 is in the non-operating state, a leakage path from the output terminal b of the first voltage transformation module 210 to the ground GND through the first diode D1, the second diode D2 and the first switch Q1 cannot be formed. In this way, the voltage abnormality of the output terminal b of the first transformation module 210 can be prevented. Meanwhile, based on the forward conduction characteristic of the second diode D2, the output terminal b of the second voltage transformation module 230 and the cathode of the first diode D1 are always kept conductive, so that the series connection of the second voltage transformation module 230 and the second voltage stabilizing module 240 is not affected to form a power supply path.

2. In another possible embodiment, the control module 250 includes a voltage follower 252.

Fig. 9 is a block diagram of a power management circuit 20 according to another embodiment of the present application. As shown in fig. 9, the control module 250 may include a voltage follower 252. The input terminal a of the voltage follower 252 is connected to the output terminal b of the second transformation module 230. The output terminal b of the voltage follower 252 is connected to the input terminal a of the second voltage stabilizing module 240 and the cathode of the first diode D1. The voltage follower 252 also has forward on and reverse off characteristics. Based on this, the voltage abnormality of the output terminal b of the first voltage transformation module 210 can be prevented without affecting the connection of the second voltage transformation module 230 and the second voltage stabilizing module 240 in series to form a power supply path.

Fig. 10 is a circuit diagram of a voltage follower 252 according to an embodiment of the present application. As shown in fig. 10, the voltage follower 252 may include a first comparator A1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first end of the first resistor R1 is the input end a of the voltage follower 252, and the second end of the first resistor R1 is connected to the non-inverting input end of the first comparator A1. The non-inverting input terminal of the first comparator A1 is also connected to the ground GND through a second resistor R2. The output terminal of the first comparator A1 is the output terminal b of the voltage follower 252. The third resistor R3 is connected between the inverting input terminal of the first comparator A1 and the ground GND. The fourth resistor R4 is connected between the inverting input terminal and the output terminal of the first comparator A1.

In some other possible embodiments, the control module 250 may also be a unidirectional linear voltage regulator, etc., which will not be described again.

In this possible implementation manner, the unidirectional conduction module is adopted as the control module 250, so that the cathode of the first diode D1 and the output terminal b of the second voltage transformation module 230 are always kept off, and no additional control device or control logic is needed, so that the circuit is simple to implement, saving of electronic components is facilitated, and cost saving and circuit integration improvement are facilitated.

2. In a second possible implementation, the control module 250 is a bidirectional conduction module. The control module 250 is turned off when the first transformation module 210 is in an operating state and the second transformation module 230 is in an inactive state; the control module 250 is turned on when the second transforming module 230 is in an operating state.

In this possible implementation, as shown in fig. 11, the control module 250 may include a switching unit 254 capable of bi-directional conduction. The first terminal a of the switching unit 254 is connected to the output terminal b of the second transforming module 230. The second terminal b of the switching unit 254 is connected to the input terminal a of the second voltage stabilizing module 240 and the cathode of the first diode D1. The switching unit 254 is turned off when the first transforming module 210 is in an operating state and the second transforming module 230 is in an inactive state; the switching unit 254 is turned on when the second transforming module 230 is in an operating state. Wherein, the switch unit 254 is turned off, which means that the switch unit 254 is turned off between the first end a and the second end b; switching on the switching unit 254 means switching on between the first terminal a and the second terminal b of the switching unit 254. In this way, when the second voltage transformation module 230 is in the inactive state, the switch unit 254 is turned off, and at this time, a leakage path from the output terminal b of the first voltage transformation module 210 to the ground GND via the first diode D1, the switch unit 254 and the first switch Q1 cannot be formed. When the second voltage transformation module 230 is in the working state, the output end b of the second voltage transformation module 230 is communicated with the input end a of the second voltage stabilizing module 240 through the switch unit 254, so that the second voltage transformation module 230 and the second voltage stabilizing module 240 are not affected to form a power supply path in series.

Further, as shown in fig. 12, a processing unit 256 may also be included in the control module 250. An output d of the processing unit 256 is connected to a control c of the switching unit 254. The processing unit 256 is configured to: when the first voltage transformation module 210 is in an operating state and the second voltage transformation module 230 is in a non-operating state, outputting a first level signal to the control end c of the switch unit 254, where the first level signal is used to control the switch unit 254 to be turned off; when the second voltage transformation module 230 is in the working state, a second level signal is output to the control terminal c of the switch unit 254, and the second level signal is used for controlling the switch unit 254 to be turned on. The first level signal is one of a high level signal and a low level signal, and the second level signal is the other of the high level signal and the low level signal. Here, the processing unit 256 may be an SOC in the electronic device, or may be an electronic component having a control function other than the SOC in the electronic device. The output d of the processing unit 256 may be a general purpose input/output port (general purpose input/output ports, GPIO).

The structure of the switching unit 254 in this implementation is explained below from two possible embodiments.

1. In one possible embodiment, as shown in fig. 13, the switching unit 254 includes a transistor Q3. Transistor Q3 is a three terminal switching device. For example, the transistor Q3 may be a field effect transistor (FIELD EFFECT transistor, FET), and specifically may be a metal oxide semiconductor field effect transistor (metal oxide semiconductor FIELD EFFECT transistor, MOSFET). The first pole of the transistor Q3 is connected to the output b of the second transformation module 230. The second pole of the transistor Q3 is connected to the input terminal a of the second voltage stabilizing module 240 and the cathode of the first diode D1. The first pole of the transistor Q3 is one of a source and a drain of the transistor Q3, and the second pole of the transistor Q3 is the other of the source and the drain of the transistor Q3.

The control electrode of the transistor Q3 is connected to the output terminal d of the processing unit 256, so that the processing unit 256 can control the on and off of the transistor Q3, i.e. between the first electrode and the second electrode of the transistor Q3. In some possible embodiments, transistor Q3 is an N-type MOSFET. At this time, the first level signal is a low level signal for controlling the turn-off between the first pole and the second pole of the transistor Q3; the second level signal is a high level signal for controlling conduction between the first and second poles of the transistor Q3. In other possible embodiments, transistor Q3 is a P-type MOSFET. At this time, the first level signal is a high level signal; the second level signal is a low level signal.

2. In another possible embodiment, as shown in fig. 14, the switching unit 254 includes a load switch 255. The load switch 255 is a three terminal switching device. The first terminal a of the load switch 255 is connected to the output terminal b of the second transformation module 230. The second terminal b of the load switch 255 is connected to the input terminal a of the second voltage stabilizing module 240 and the cathode of the first diode D1. The control terminal c of the load switch 255 is connected to the output terminal d of the processing unit 256, so that the processing unit 256 can control the on-off of the load switch 255, i.e. control the on-off between the first terminal a and the second terminal b of the load switch 255.

Fig. 15 is a circuit diagram of a load switch 255 according to an embodiment of the present application. As shown in fig. 15, in some embodiments, the load switch 255 may include a fifth resistor R5, a fourth switch Q4, and a fifth switch Q5. The fourth switch Q4 may be an N-type MOSFET, and the fifth switch Q5 may be a P-type MOSFET. The first end of the fourth switch Q4 is the first end a of the load switch 255, and the second end of the fourth switch Q4 is the second end b of the load switch 255. The first terminal of the fifth switch Q5 is connected to the ground GND. The second terminal of the fifth switch Q5 is connected to the control terminal of the fourth switch Q4. The fifth resistor R5 is connected between the first terminal and the control terminal of the fourth switch Q4. The control terminal of the fifth switch Q5 is the control terminal c of the load switch 255.

When the load switch 255 is operated, if the output terminal d of the processing unit 256 outputs a low level signal, the fifth switch Q5 is turned on, and at this time, the control terminal of the fourth switch Q4 inputs the low level signal, and the fourth switch Q4 is turned off, that is, the load switch 255 is turned off. That is, in this possible embodiment, the first level signal is a low level signal. On the contrary, if the output terminal d of the processing unit 256 outputs a high level signal, the fifth switch Q5 is turned off, and if the second transforming module 230 outputs a voltage, the control terminal of the fourth switch Q4 inputs a high level signal, and the fourth switch Q4 is turned on, i.e. the load switch 255 is turned on. That is, the second level signal is a high level signal.

In this possible implementation, a bidirectional conduction module is used as the control module 250, so that the cathode of the first diode D1 and the output terminal b of the second voltage transformation module 230 are turned off when the second voltage transformation module 230 is in the inactive state, and turned on when the second voltage transformation module 230 is in the active state. Based on this, when the second voltage transformation module 230 is in the working state, if the load connected to the second voltage stabilization module 240 is reduced in the voltage and current pumping, the redundant voltage and current in the second voltage stabilization module 240 can flow back to the second voltage transformation module 230, so as to avoid the occurrence of oscillating current.

The circuit structures of the first transformer module 210 and the second transformer module 230 are explained in detail with reference to the drawings.

1. The circuit structure of the first transformation module 210.

1. The first transformer module 210 is a buck circuit.

Fig. 16 is a circuit diagram of a first transformer module 210 according to an embodiment of the application. As shown in fig. 16, in this case, the first transformation module 210 includes a sixth switch Q6, a third inductor L3, a seventh switch Q7, a first controller 212, and a second comparator A2.

The first end of the sixth switch Q6 is connected to the energy storage module. That is, the first end of the sixth switch Q6 is the input end a of the first transformer module 210. The second end of the sixth switch Q6 is connected to the first end of the third inductor L3 and the first end of the seventh switch Q7. The second end of the third inductor L3 is connected to the input terminal a of the first voltage stabilizing module 220. That is, the second end of the third inductor L3 is the output end b of the first transformer module 210. The second terminal of the seventh switch Q7 is connected to the ground GND.

The first controller 212 is connected to the control terminal of the sixth switch Q6 and the control terminal of the seventh switch Q7. When the first voltage transformation module 210 operates, the first controller 212 controls the voltage of the output terminal b of the first voltage transformation module 210 by controlling the duty ratio of the sixth switch Q6 and the seventh switch Q7. The duty ratio of the switch (including the sixth switch Q6 and the seventh switch Q7) refers to the percentage of the on-time length of the switch to the total period length in one on-and off-time period of the switch.

Specifically, when the first voltage transformation module 210 shown in fig. 16 is operated, the first controller 212 may control the sixth switch Q6 to be turned on and the seventh switch Q7 to be turned off, so as to charge the third inductor L3. After the charge amount of the third inductor L3 reaches a certain value, the first controller 212 may further control the sixth switch Q6 to be turned off and the seventh switch Q7 to be turned on, so that the third inductor L3 supplies power to the first voltage stabilizing module 220. The voltage at the output terminal b of the first voltage transformation module 210 is smaller than the voltage of the energy storage module by this circulation. In this process, the larger the duty ratio of the sixth switch Q6, the larger the voltage at the output terminal b of the first transformation module 210; conversely, the smaller the duty cycle of the sixth switch Q6, the smaller the voltage at the output b of the first transforming module 210.

The inverting input terminal of the second comparator A2 is used for inputting the reference voltage. The non-inverting input terminal of the second comparator A2 is connected to the second terminal of the third inductor L3 (connection relationship not shown in the figure). That is, the non-inverting input terminal of the second comparator A2 is the detection terminal c of the first transformer module 210. In the embodiment of the present application, the reference voltage may be equal to the first preset voltage. The first controller 212 may be configured to decrease the duty ratio of the sixth switch Q6 upon receiving the high level signal output from the second comparator A2; the duty ratio of the sixth switch Q6 is increased upon receiving the low level signal output from the second comparator A2.

Thus, when the voltage at the output terminal b of the first voltage transformation module 210 is greater than the first preset voltage, the second comparator A2 outputs a high level signal, and the first controller 212 decreases the duty ratio of the sixth switch Q6, so that the voltage at the output terminal b of the first voltage transformation module 210 is decreased. When the voltage at the output terminal b of the first voltage transformation module 210 is less than the first preset voltage, the second comparator A2 outputs a low level signal, and the first controller 212 increases the duty ratio of the sixth switch Q6, so that the voltage at the output terminal b of the first voltage transformation module 210 is increased.

It will be appreciated that in some specific embodiments, the first controller 212 and the processing unit 256 may be integrated. That is, the function of the first controller 212 may also be implemented by an SOC or other electronic component having a control function in the electronic device.

2. The first transforming module 210 is a boost circuit.

Fig. 17 is a circuit diagram of another first transformer module 210 according to an embodiment of the application. As shown in fig. 17, in this case, the first transformation module 210 includes a fourth inductor L4, an eighth switch Q8, a ninth switch Q9, a first controller 212, and a third comparator A3.

The first end of the fourth inductor L4 is connected to the energy storage module. That is, the first end of the fourth inductor L4 is the input end a of the first transformer module 210. The second end of the fourth inductor L4 is connected to the first end of the eighth switch Q8 and the first end of the ninth switch Q9. A second terminal of the eighth switch Q8 is connected to the ground GND. The second terminal of the ninth switch Q9 is connected to the input terminal a of the first voltage stabilizing module 220. That is, the second end of the ninth switch Q9 is the output end b of the first transformer module 210.

The first controller 212 is connected to the control terminals of the eighth and ninth switches Q8 and Q9 to control the voltage of the output terminal b of the first transformation module 210 by controlling the duty ratio of the eighth and ninth switches Q8 and Q9. In this embodiment, the first controller 212 may control the eighth switch Q8 to be turned on and the ninth switch Q9 to be turned off to charge the fourth inductor L4. After the charge amount of the fourth inductor L4 reaches a certain value, the first controller 212 may further control the eighth switch Q8 to be turned off and the ninth switch Q9 to be turned on, and at this time, the energy storage module and the fourth inductor L4 are connected in series to supply power to the first voltage stabilizing module 220. The voltage at the output terminal b of the first voltage transformation module 210 is greater than the voltage of the energy storage module by this circulation. In this process, the larger the duty ratio of the eighth switch Q8, the larger the voltage at the output terminal b of the first transformation module 210; conversely, the smaller the duty cycle of the eighth switch Q8, the smaller the voltage at the output b of the first transforming module 210.

The inverting input terminal of the third comparator A3 is used for inputting the reference voltage. The non-inverting input terminal of the third comparator A3 is connected to the second terminal of the ninth switch Q9 (connection relationship not shown in the figure). That is, the non-inverting input terminal of the third comparator A3 is the detection terminal c of the first transformer module 210. In the embodiment of the present application, the reference voltage may be equal to the first preset voltage. The first controller 212 may be configured to decrease the duty ratio of the eighth switch Q8 upon receiving the high level signal output from the third comparator A3; the duty ratio of the eighth switch Q8 is increased when the low level signal output from the third comparator A3 is received, and will not be described again.

2. The circuit structure of the second transformation module 230.

The second transformer module 230 is a buck circuit. In this case, as shown in fig. 18, the second transformation module 230 further includes a second switch Q2 and a first inductor L1. The first end of the second switch Q2 is connected to the energy storage module. That is, the first end of the second switch Q2 is the input end a of the second transformer module 230. The second end of the second switch Q2 is connected to the first end of the first switch Q1 and the first end of the first inductor L1. The second terminal of the first switch Q1 is adapted to be connected to ground GND. The second terminal of the first inductor L1 is connected to the first terminal a of the control module 250. That is, the second end of the first inductor L1 is the output end b of the second transformer module 230.

In some embodiments, as shown in fig. 18, a second controller 232 is also included in the second transformation module 230. The second controller 232 is connected to the control terminal of the first switch Q1 and the control terminal of the second switch Q2, so as to control the voltage of the output terminal b of the second voltage transformation module 230 by controlling the duty ratio of the first switch Q1 and the second switch Q2. In this embodiment, the second voltage transformation module 230 may also implement feedback adjustment by providing a comparator, which will not be described again.

It can be appreciated that only the second transformer module 230 is taken as a buck circuit for example, and the circuit structure of the second transformer module 230 will be described herein. In other embodiments, the second transformer module 230 may be other types of transformer circuits, such as a bidirectional buck-boost circuit or a bidirectional boost-buck circuit. It should be understood that the technical problem to be solved by the present application is that the normally-closed first switch Q1 is connected between the output terminal b of the second voltage transformation module 230 and the ground GND, and therefore, the situation that the first switch Q1 is a normally-closed switch is understood to be within the protection scope of the embodiment of the present application.

It will be appreciated that in some specific embodiments, the second controller 232 and the processing unit 256 may be integrated. That is, the function of the second controller 232 may also be implemented by an SOC or other electronic component having a control function in the electronic device.

The power management circuit 20 provided in the embodiment of the application at least has the following beneficial effects: 1. the control module 250 is configured to: when the first voltage transformation module 210 is in an operating state and the second voltage transformation module 230 is in a non-operating state, the cathode of the first diode D1 is cut off from the output terminal b of the second voltage transformation module 230. In this case, when the first transformer module 210 is in the operating state and the second transformer module 230 is in the non-operating state, the output terminal b of the first transformer module 210 cannot be connected to the ground GND through the first diode D1 and the second transformer module 230. In this way, the voltage at the output terminal b of the first voltage transformation module 210 can be prevented from being abnormal, thereby improving the service life of the electronic device. 2. The control module 250 may be a unidirectional conduction module, so that the cathode of the first diode D1 and the output terminal b of the second voltage transformation module 230 are always kept off, and no additional control device and control logic are needed. 3. The control module 250 may be a bidirectional conduction module, so that the cathode of the first diode D1 and the output terminal b of the second voltage transformation module 230 are turned off when the second voltage transformation module 230 is in the inactive state, and turned on when the second voltage transformation module 230 is in the active state. Based on this, when the second voltage transformation module 230 is in the working state, if the load connected to the second voltage stabilization module 240 is reduced in the voltage and current pumping, the redundant voltage and current in the second voltage stabilization module 240 can flow back to the second voltage transformation module 230, so as to avoid the occurrence of oscillating current. 4. In the related art, to avoid the abnormal voltage at the output terminal b of the first voltage transformation module 210, the second voltage transformation module 230 is generally omitted, so that the second voltage stabilizing module 240 cannot operate. The power management circuit 20 provided in the embodiment of the present application enables the second voltage stabilizing module 240 to work normally, so that the resource utilization rate of the power management circuit 20 can be improved, and the cost of devices required by the electronic device can be saved.

The embodiment of the application also provides a power management chip. The power management chip includes a power management circuit 20 as in any of the embodiments described above.

In some embodiments, the power management chip further includes a package structure. The power management circuit 20 is encapsulated by an encapsulation structure.

Fig. 19 is an internal structural diagram of an electronic device 30 according to an embodiment of the present application. As shown in fig. 19, an embodiment of the present application further provides an electronic device 30, including an energy storage module, and the power management circuit 20 or the power management chip described in any of the foregoing embodiments.

In some embodiments, as shown in fig. 19, the electronic device 30 further includes a first load 312 and a second load 314. The first load 312 is connected to the output terminal b of the first voltage stabilizing module 220, so that the power supply path formed by connecting the first voltage transforming module 210 and the first voltage stabilizing module 220 in series supplies power to the first load 312. The second load 314 is connected to the output terminal b of the second voltage stabilizing module 240, so that the second voltage transforming module 230, the control module 250, and the power supply path formed by connecting the second voltage stabilizing module 240 in series supply power to the second load 314.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. The power supply management circuit is characterized by comprising a first voltage transformation module, a second voltage transformation module, a first voltage stabilizing module, a first diode, a control module and a second voltage stabilizing module;

The input end of the first voltage transformation module and the input end of the second voltage transformation module are both used for being connected with the energy storage module, the output end of the first voltage transformation module is connected with the input end of the first voltage stabilization module and the anode of the first diode, the detection end of the first voltage transformation module is connected with the output end of the first voltage transformation module, and the first voltage transformation module is used for: when the voltage of the output end of the first transformation module is detected to be smaller than a first preset voltage, the voltage of the output end of the first transformation module is increased;

The output end of the second voltage transformation module is connected with the first end of the control module, and the second end of the control module is connected with the input end of the second voltage stabilization module and the cathode of the first diode; the second voltage transformation module comprises a first switch connected between the output end of the second voltage transformation module and the ground wire, and when the second voltage transformation module is in a non-working state, the first switch is conducted;

The control module is used for: when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state, the cathode of the first diode and the output end of the second voltage transformation module are cut off.

2. The power management circuit of claim 1, wherein the control module is a unidirectional conduction module, a first end of the control module is an input end, and a second end of the control module is an output end.

3. The power management circuit of claim 2, wherein the control module comprises a second diode, an anode of the second diode is connected to an output of the second voltage transformation module, and a cathode of the second diode is connected to an input of the second voltage stabilization module and a cathode of the first diode.

4. The power management circuit of claim 2, wherein the control module comprises a voltage follower, an input of the voltage follower is connected to an output of the second voltage transformation module, and an output of the voltage follower is connected to an input of the second voltage stabilization module and a cathode of the first diode.

5. The power management circuit of claim 1, wherein the control module comprises a switch unit, a first end of the switch unit is connected with an output end of the second voltage transformation module, and a second end of the switch unit is connected with an input end of the second voltage stabilization module and a cathode of the first diode;

the switch unit is turned off when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state; the switch unit is conducted when the second voltage transformation module is in a working state.

6. The power management circuit of claim 5, wherein the control module further comprises: the output end of the processing unit is connected with the control end of the switch unit;

The processing unit is used for: when the first voltage transformation module is in a working state and the second voltage transformation module is in a non-working state, outputting a first level signal to a control end of the switch unit, wherein the first level signal is used for controlling the switch unit to be turned off; when the second voltage transformation module is in a working state, a second level signal is output to the control end of the switch unit, and the second level signal is used for controlling the switch unit to be conducted.

7. The power management circuit of claim 6 wherein the switching unit comprises a transistor having a first pole connected to the output of the second voltage transformation module, a second pole connected to the input of the second voltage stabilization module and the cathode of the first diode, and a control pole connected to the output of the processing unit.

8. The power management circuit of claim 6, wherein the switching unit comprises a load switch, a first end of the load switch is connected to the output of the second voltage transformation module, a second end of the load switch is connected to the input of the second voltage stabilization module and the cathode of the first diode, and a control end of the load switch is connected to the output of the processing unit.

9. The power management circuit according to any one of claims 1 to 8, wherein the second transformation module further comprises: a second switch and an inductance;

The first end of the second switch is used for being connected with the energy storage module, the second end of the second switch is connected with the first end of the first switch and the first end of the inductor, the second end of the first switch is used for being connected with the ground wire, and the second end of the inductor is connected with the first end of the control module.

10. A power management chip comprising a power management circuit as claimed in any one of claims 1 to 9.

11. An electronic device comprising an energy storage module and a power management circuit as claimed in any one of claims 1 to 9 or a power management chip as claimed in claim 10.

12. The electronic device of claim 11, wherein the electronic device further comprises a first load and a second load;

the first load is connected with the output end of the first voltage stabilizing module, and the second load is connected with the output end of the second voltage stabilizing module.