CN117614268A - Power management circuit, power management chip and electronic equipment - Google Patents

Abstract

This application discloses a power management circuit, a power management chip and an electronic device, and relates to the field of circuit technology. The power management circuit includes 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. Wherein, the first voltage transformation module and the first voltage stabilizing module are connected in series, and the second voltage transforming module and the second voltage stabilizing module are connected in series. The diode is connected between the input terminal of the first voltage stabilizing module and the input terminal of the second voltage stabilizing module. The control module is connected in series between the second transformer module and the second voltage stabilizing module, so that when the first transformer module is in the working state and the second transformer module is in the inactive state, the cathode of the diode is connected to the second transformer module. The output terminals of the module are cut off. In this way, abnormal voltage at the output end of the first transformer module can be prevented, thereby extending the service life of the electronic device.

Description

Power management circuits, power management chips and electronic equipment

Technical field

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

Background technique

In electronic devices such as mobile phones, tablets, and laptops, energy storage modules need to supply power to multiple loads through power management circuits. Generally, the power management circuit includes a first voltage transformation module, a second voltage transformation module, a first voltage stabilization module and a second voltage stabilization module. Wherein, the output end of the first transformer module and the input end of the first voltage stabilizing module are connected to form a power supply path, and the output end of the second transformer module and the input end of the second voltage stabilizing module are connected to form another power supply path. The energy storage module can 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 transformer module is in operation and the second transformer module is not in operation, the output end of the first transformer module will be connected to the ground through the diode and the second transformer module. , which will cause the voltage at the output end of the first transformer module to be abnormal, affecting the service life of the electronic equipment.

Contents of the invention

This application provides a power management circuit, a power management chip and an electronic device, which can solve the problem of abnormal voltage at the output end of the first transformer module in related technologies, thereby increasing the service life of the electronic device. The technical solutions are as follows:

In a first aspect, a power management circuit is provided. The power management circuit includes 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 transformer module is used to connect with the energy storage unit. The output terminal of the first voltage transforming module is connected to the input terminal of the first voltage stabilizing module. The output terminal of the first voltage stabilizing module is used to connect with the load to provide power to the load. That is to say, the first transformer module and the first voltage stabilizing module are connected in series to form a power supply path. Here, the first transformer module also has a detection terminal. The detection terminal of the first transformer module is connected to the output terminal of the first transformer module. The first transformer module is used to: when detecting that the voltage of the output terminal of the first transformer module is less than the first preset voltage, increase the voltage of the output terminal of the first transformer module; when detecting that the output voltage of the first transformer module When the voltage at the output terminal is greater than the first preset voltage, the voltage at the output terminal of the first transformer module is reduced.

The input end of the second transformer module is used to connect with the energy storage unit. The output end of the second transformer module is connected to the first end of the control module. The second end of the control module is connected to the input end of the second voltage stabilizing module. The output terminal of the second voltage stabilizing module is used to connect with the load to provide power to the load. That is to say, the second transformer module, the control module and the second voltage stabilizing module are connected in series to form another power supply path. Wherein, the second transformer module includes a first switch connected between the output terminal of the second transformer module and the ground wire. The first switch is a normally closed switch. That is to say, when the second transformer module is in an inoperative state, the first switch is turned on.

The anode of the first diode is connected to the output terminal of the first transformer module and the input terminal of the first voltage stabilizing module, and the cathode of the first diode is connected to the second terminal of the control module and the input terminal of the second voltage stabilizing module. connect. Wherein, the control module is used to: when the first transformer module is in the working state and the second transformer module is in the inoperative state, the cathode of the first diode and the output end of the second transformer module are cut off.

In the embodiment of the present application, the power management circuit includes 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. Wherein, the first voltage transformation module and the first voltage stabilizing module are connected in series to form a power supply path, and the second voltage transforming module and the second voltage stabilizing module are connected in series to form another power supply path. The first diode is connected between the input terminal of the first voltage stabilizing module and the input terminal of the second voltage stabilizing module. The control module is connected in series between the second transformer module and the second voltage stabilizing module, so that when the first transformer module is in the working state and the second transformer module is in the inoperative state, the cathode of the first diode is connected to the second voltage stabilizing module. The output terminals of the second transformer module are cut off. In this case, when the first transformer module is in the working state and the second transformer module is in the inoperative state, the output end of the first transformer module cannot pass through the first diode, the second transformer module and the ground. Line is connected. In this way, abnormal voltage at the output end of the first transformer module can be prevented, thereby extending the service life of the electronic device.

In some embodiments, the first transform module may be a buck transform circuit, a boost transform module, or a bidirectional buck-boost transform circuit. The second transformer module may be a buck transformer circuit.

In some specific embodiments, the second transformer module is a buck transformer circuit. In this case, the second transformer module also includes a second switch and an inductor. Wherein, the first end of the second switch is used to connect with the energy storage module. The second terminal of the second switch is connected to the first terminal of the first switch and the first terminal of the inductor. The second terminal of the first switch is used for connection with the ground wire. The second end of the inductor is connected to the first end of the control module.

The following describes the structure of the control module from two possible implementation methods.

In a first possible implementation manner, the control module is a one-way conduction module, 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 includes a second diode. The anode of the second diode is connected to the output terminal of the second transformer module. The cathode of the second diode is connected to the input terminal 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 terminal of the voltage follower is connected to the output terminal of the second transformer module. The output terminal of the voltage follower is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode.

In the second possible implementation manner, the control module is a two-way communication module. In this case, the control module includes a switching unit. The first end of the switch unit is connected to the output end of the second transformer module. The second end of the switch unit is connected to 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 transformer module is in the working state and the second transformer module is in the inoperative state; the switch unit is turned on when the second transformer module is in the working state. In this way, on the one hand, when the second transformer module is in an inoperative state, the switch unit is turned off, so that the output end of the first transformer module cannot be connected to the ground wire through the first diode and the second transformer module. On the other hand, when the second voltage transformer module is in operation, if the voltage and current draw by the load connected to the second voltage stabilizing module is reduced, the excess voltage and current in the second voltage stabilizing module can flow back to The second transformer module avoids the occurrence of oscillating current.

Further, the control module may also include a processing unit. The output terminal of the processing unit is connected to the control terminal of the switch unit. The processing unit is used to: when the first transformer module is in a working state and the second transformer module is in an inoperative state, output a first level signal to the control end of the switch unit, and the first level signal is used to control the switch unit. Turn off; when the second transformer module is in the working state, output a second level signal to the control terminal of the switch unit, and the second level signal is used to control the switch unit to turn on.

In some possible embodiments, the switching unit includes a transistor. The first pole of the transistor is connected to the output terminal of the second transformer module. The second pole of the transistor is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode. The control electrode of the transistor is connected to the output terminal of the processing unit.

In other possible embodiments, the switch unit includes a load switch. The first end of the load switch is connected to the output end of the second transformer module. The second terminal of the load switch is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode. The control terminal of the load switch is connected to the output terminal of the processing unit.

A second aspect also provides a power management chip, including any one of the power management circuits in the first aspect.

In some embodiments, the power management chip also includes a packaging structure. Power management circuitry is encapsulated within the packaging structure.

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

In some embodiments, the electronic device further includes a first load and a second load. The first load is connected to the output terminal of the first voltage stabilizing module, and the second load is connected to the output terminal of the second voltage stabilizing module.

The technical effects obtained by the above-mentioned second aspect and the third aspect are similar to the technical effects obtained by the corresponding technical means in the above-mentioned first aspect, and will not be described again here.

Description of drawings

Figure 1 is a schematic diagram of the appearance of the first electronic device in the related art;

Figure 2 is a schematic diagram of the appearance of the second electronic device in the related art;

Figure 3 is an internal structure diagram of an electronic device in the related art;

Figure 4 is a voltage change diagram under an ideal state in related technology;

Figure 5 is a leakage path diagram of a power management circuit in the related art;

Figure 6 is a voltage change diagram under actual conditions in the related art;

Figure 7 is a structural diagram of a first power management circuit provided by an embodiment of the present application;

Figure 8 is a structural diagram of a second power management circuit provided by an embodiment of the present application;

Figure 9 is a structural diagram of a third power management circuit provided by an embodiment of the present application;

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

Figure 11 is a structural diagram of a fourth power management circuit provided by an embodiment of the present application;

Figure 12 is a structural diagram of a fifth power management circuit provided by an embodiment of the present application;

Figure 13 is a structural diagram of a sixth power management circuit provided by an embodiment of the present application;

Figure 14 is a structural diagram of a seventh power management circuit provided by an embodiment of the present application;

Figure 15 is a circuit diagram of a load switch provided by an embodiment of the present application;

Figure 16 is a circuit diagram of the first first transformer module provided by the embodiment of the present application;

Figure 17 is a circuit diagram of the second first transformer module provided by the embodiment of the present application;

Figure 18 is a structural diagram of an eighth power management circuit provided by an embodiment of the present application;

Figure 19 is an internal structure diagram of an electronic device provided by an embodiment of the present application.

Among them, the meanings represented by each drawing symbol are:

Related technologies:

10. Electronic equipment; 110. Energy storage module; 120. Power management circuit; 122. First voltage transformation module; 124. First voltage stabilization module; 126. Second voltage transformation module; 128. Second voltage stabilization module; 132 , the first load; 134, the second load;

This application:

20. Power management circuit; 210. First voltage transformation module; 212. First controller; 220. First voltage stabilization module; 230. Second voltage transformation module; 232. Second controller; 240. Second voltage stabilization module Module; 250, control module; 252, voltage follower; 254, switch unit; 255, load switch; 256, processing unit; 30, electronic equipment; 32, energy storage module; 312, first load; 314, second load .

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that "plurality" mentioned in this application means two or more. In the description of this application, unless otherwise stated, "/" means or, for example, A/B can mean A or B; "and/or" in this article is just an association relationship describing related objects, It means that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to facilitate a clear description of the technical solution of the present application, words such as “first” and “second” are used to distinguish identical or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the number and execution order, and words such as "first" and "second" do not limit the number and execution order.

Before giving a detailed explanation of the power management circuit provided by the embodiment of the present application, the application scenarios and related technologies of the power management circuit are first described.

Electronic devices 10 include smart watches, mobile phones, tablets, laptops, etc. 1 and 2 are schematic appearance 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 usually includes a power management chip, and the power management chip includes a packaging structure and a power management circuit packaged in the packaging structure. In the electronic device 10, the energy storage module needs to supply power to multiple loads through the power management circuit. The multiple loads here may be, for example, a display screen of the electronic device 10 , a system on chip (SOC), etc.

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 multiple transformer modules and multiple voltage stabilizing modules. Multiple transformer modules and multiple voltage stabilizing modules are connected in series to form multiple power supply paths. The energy storage module 110 can supply power to one or more loads through a power supply path. For example, in the embodiment shown in FIG. 3 , the power management circuit 120 shown includes a first voltage transformation module 122 , a second voltage transformation module 126 , a first voltage stabilization module 124 and a second voltage stabilization module 128 . The output terminal b of the first transformer module 122 and the input terminal a of the first voltage stabilizing module 124 are connected to form a power supply path. The input terminal a of the first transformer module 122 is connected to the energy storage module 110 . The output terminal b of the first voltage stabilizing module 124 is connected to the first load 132 . In this way, the energy storage module 110 can supply power to the first load 132 through the first transformer module 122 and the first voltage stabilizing module 124 . Similarly, the output terminal b of the second transformer module 126 and the input terminal a of the second voltage stabilizing module 128 are connected to form another power supply path. The input terminal a of the second transformer module 126 is connected to the energy storage module 110 . The output terminal b of the second voltage stabilizing module 128 is connected to the second load 134 . In this way, the energy storage module 110 can supply power to the second load 134 through the second transformer module 126 and the second voltage stabilizing module 128 .

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

When the electronic device 10 is working, in an ideal state, the voltage change of the output terminal b of the first transformer module 122 and the voltage change of the output terminal b of the second transformer module 126 can be as shown in FIG. 4 . In the embodiment shown in FIG. 4 , the abscissa is time T; the ordinate is voltage V; curve ① is the voltage change curve of the output terminal b of the first transformer module 122 under the ideal state; curve ② is the voltage change curve of the output terminal b of the first transformer module 122 under the ideal state; The voltage variation curve of the output terminal b of the second transformer module 126; the first preset voltage is V1; the second preset voltage is V2. As shown in Figure 4, in an ideal state, before time T1, neither the first transformer module 122 nor the second transformer module 126 is working. At this time, the voltage of the output terminal b of the first transformer module 122 is equal to the voltage of the second transformer module 122. The voltage of the output terminal b of the transformer module 126 is all 0. At time T1, the first transformer module 122 starts to work. At this time, the voltage of the output terminal b of the first transformer module 122 gradually increases. At time T2, the voltage of the output terminal b of the first transformer module 122 increases to the first preset voltage V1, and the voltage of the output terminal b of the first transformer module 122 no longer increases and remains at V1. At time T3, the second transformer module 126 starts to work. At this time, the voltage of the output terminal b of the second transformer module 126 gradually increases. At time T4, the voltage of the output terminal b of the second transformer module 126 increases to the second preset voltage V2, and the voltage of the output terminal b of the second transformer module 126 no longer increases 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 will pass through the diode D1 and the second transformer module 126 It is connected to the ground wire to form a leakage path from the output terminal b of the first transformer module 122 to the ground wire.

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 transformer 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 terminal of the first switch Q1 is connected to the first terminal of the first inductor L1, and the second terminal of the first switch Q1 is connected to the ground line GND. The first switch Q1 is a normally closed switch. That is to say, when the second transformer module 126 is not in the working state, the first switch Q1 continues to be in the closed conductive state. Based on this, 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 passes through the diode D1, the first inductor L1 and the first switch. Q1 is connected to the ground wire GND, forming a leakage path. In the embodiment shown in FIG. 5 , the leakage paths are marked by solid lines E1, E2, E3, and E4 with arrows.

In this case, when the electronic device 10 is working, in the actual state, the voltage change of the output terminal b of the first transformer module 122 and the voltage change of the output terminal b of the second transformer module 126 can be as shown in FIG. 6 . In the embodiment shown in Figure 6, the abscissa is time T; the ordinate is voltage V; curve ① is the voltage change curve of the output terminal b of the first transformer module 122 in the actual state; curve ② is the voltage change curve of the output terminal b of the first transformer module 122 in the actual state; The voltage variation curve of the output terminal b of the second transformer module 126; the first preset voltage is V1; the second preset voltage is V2. As shown in Figure 6, in the actual state, before time T1, neither the first transformer module 122 nor the second transformer module 126 is working. At this time, the voltage of the output terminal b of the first transformer module 122 is equal to the voltage of the second transformer module 122. The voltage of the output terminal b of the transformer module 126 is all 0. At time T1, the first transformer module 122 starts to work. At this time, the voltage of the output terminal b of the first transformer module 122 gradually increases. At time T2, the voltage of the output terminal b of the first transformer module 122 increases to the first preset voltage V1. However, since the second transformer module 126 is not in the working state, there is a leakage path in the power management circuit 120, resulting in The voltage detected by the detection terminal c of the first transformer module 122 is less than the first preset voltage V1, so the voltage of the output terminal b of the first transformer module 122 continues to increase. At time T21, the voltage of the output terminal b of the first transformer module 122 increases to the maximum value V3 of the voltage that the first transformer module 122 can output. At this time, the voltage of the output terminal b of the first transformer module 122 no longer increases. Large, keep it as V3. At time T3, the second transformer module 126 starts to work. At this time, the voltage of the output terminal b of the second transformer module 126 gradually increases. At the same time, since the second transformer module 126 starts to output voltage, the leakage path disappears. In this case, the voltage detected by the detection terminal c of the first transformer module 122 is greater than the first preset voltage V1, so the first transformer module 122 The voltage at output terminal b of module 122 begins to decrease. At time T4, the voltage of the output terminal b of the second transformer module 126 increases to the second preset voltage V2, and the voltage of the output terminal b of the second transformer module 126 no longer increases and remains at V2; The voltage of the output terminal b of the voltage converter module 122 decreases to the first preset voltage V1, and the voltage of the output terminal b of the first transformer module 122 no longer decreases and remains at V1.

Comparing Figure 4 and Figure 6, it can be seen that due to the existence of the leakage path, the voltage of the output terminal b of the first transformer module 122 is abnormal between time T2 and time T4. The voltage of the output terminal b of the first transformer module 122 is greater than The first preset voltage is preset. This may cause damage to the electronic components in the first voltage regulator and the first load 132 , affecting the service life of the electronic device 10 .

To this end, embodiments of the present application provide a power management circuit, a power management chip and an electronic device, which can solve the problem of abnormal voltage at the output end of the first transformer module in related technologies, thereby extending the service life of the electronic device.

The power management circuit provided by the embodiment of the present application will be explained in detail below. The power management circuit provided by the embodiment of the present application can be directly applied to the electronic device 10 shown in Figures 1 and 2, or can be packaged into a power management chip and applied to the electronic device 10 shown in Figures 1 and 2. In the embodiments of this application, the connection between two electronic components (or electrical modules or electrical units) refers to electrical connections. The electrical connection here refers to the connection between two electronic components for the transmission of electrical signals. In addition, the electrical connection between two electronic components may be directly connected through wires or indirectly connected through other electronic components.

FIG. 7 is a structural diagram of a power management circuit 20 provided by 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 transformer module 210 has an input terminal a, an output terminal b and a detection terminal c. The input terminal a of the first transformer module 210 is used to connect to the energy storage module, and the output terminal b of the first transformer module 210 is connected to the input terminal a of the first voltage stabilizing module 220 . When working, the first transformer module 210 is used to perform voltage conversion on the DC power output by the energy storage module, and output the voltage-converted DC power to the first voltage stabilizing module 220 . For example, the first transformer module 210 may be a buck conversion (buck) circuit used to step down the DC power, or it may be a boost conversion (boost) circuit used to step up the DC power, or it may also be Bidirectional buck-boost conversion (buck-boost) circuit. The detection terminal c of the first transformer module 210 is connected to the output terminal b of the first transformer module 210 for detecting the voltage of the output terminal b of the first transformer module 210 . In this embodiment of the present application, the first transformer module 210 may be used to output the first preset voltage during operation. The first preset voltage is a voltage value preset by those skilled in the art. When the detection terminal c of the first transformer module 210 detects that the voltage of the output terminal b of the first transformer module 210 is less than the first preset voltage, the first transformer module 210 can increase the voltage of its output terminal b; vice versa; , when the detection terminal c of the first transformer module 210 detects that the voltage of the output terminal b of the first transformer module 210 is greater than the first preset voltage, the first transformer module 210 can reduce the voltage of its output terminal b, Therefore, the voltage of the output terminal b of the first transformer module 210 is maintained at the first preset voltage.

The first voltage stabilizing module 220 also has an output terminal b. The output terminal b of the first voltage stabilizing module 220 is used to be connected to one or more loads in the electronic device. That is to say, the first transformer 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. For example, if the power supply path is used to supply power to the first load, the first preset voltage may be equal to the rated voltage of the first load when operating. Here, the first load may be any one of SOC, display screen, speaker, microphone, camera, motor, sensor, etc. Among them, SOC includes central processing unit (CPU), graphics processing unit (GPU), baseband, etc. Sensors include pressure sensors, gyroscope sensors, air pressure sensors, magnetic sensors, acceleration sensors, distance sensors, proximity light sensors, fingerprint sensors, temperature sensors, touch sensors, ambient light sensors, bone conduction sensors, etc. When the first voltage stabilizing module 220 is working, it is used to stabilize the DC power output by the first transforming module 210 . For example, the first voltage stabilizing module 220 may be a low dropout linear regulator (low dropout regulator, LDO).

The second transformer module 230 has an input terminal a and an output terminal b. The input terminal a of the second transformer module 230 is used to connect to the energy storage module, and the output terminal b of the second transformer module 230 is connected to the first terminal a of the control module 250 . When working, the second transformer module 230 is used to perform voltage conversion on the DC power output by the energy storage module, and output the voltage-converted DC power to the second voltage stabilizing module 240 through the control module 250 . Here, as shown in FIG. 7 , the second transformer module 230 includes a first switch Q1 connected between the output terminal b of the second transformer module 230 and the ground line GND, and the first switch Q1 is a normally closed switch. That is to say, when the second transformer module 230 is in an inoperative state, the first switch Q1 is turned on, and the output terminal b of the second transformer module 230 is connected to the ground line GND. For example, the second transformer module 230 may be a buck circuit. In this embodiment of the present application, the second transformer module 230 may be used to output the second preset voltage during operation. The second preset voltage is a voltage value preset by those 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 to say, 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 to control the output terminal b of the second voltage transformation module 230 and the input terminal a of the second voltage stabilizing module 240. circuit between.

The output terminal b of the second voltage stabilizing module 240 is used to connect to another one or more loads in the electronic device. The “another one or more loads” here refers to the “one or more loads” connected to the output end b of the first voltage stabilizing module 220 . That is to say, the second transformer 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. For example, if the power supply path is used to supply power to the second load, the second preset voltage may be equal to the rated voltage of the second load when operating. When the second voltage stabilizing module 240 is working, it is used to stabilize the DC power output by the second transforming module 230 . For example, the second voltage stabilizing module 240 may be a low dropout linear voltage regulator.

In the embodiment of the present application, a first diode D1 is also 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 to say, the anode of the first diode D1 is connected to the output terminal b of the first transformer 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 control module 250 The second terminal b is connected to the input terminal a of the second voltage stabilizing module 240 . Based on this, in order to avoid the formation of a leakage path when the first transformer module 210 is in the working state and the second transformer module 230 is in the inactive state, the control module 250 is used to: when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state, When the second transformer module 230 is in an inoperative state, the cathode of the first diode D1 and the output terminal b of the second transformer module 230 are cut off. In this case, when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state, the output terminal b of the first transformer module 210 cannot pass through the first diode D1 and the second diode D1. The transformer module 230 is connected to the ground GND. In this way, abnormal voltage at the output terminal b of the first transformer module 210 can be prevented, thereby extending the service life of the electronic device. Based on this, in the power management circuit 20 provided by the embodiment of the present application, the voltage change of the output terminal b of the first transformer module 210 and the voltage change of the output terminal b of the second transformer module 230 can be as shown in FIG. 4 .

The structure of the control module 250 will be explained in detail below in conjunction with the drawings from two possible implementation modes.

1. In the first possible implementation manner, the control module 250 is a one-way conduction module, and the first end a of the control module 250 is the input end, and the second end b of the control module 250 is the output end.

In this possible implementation, the control module 250 is a one-way conducting module. Therefore, the cathode of the first diode D1 and the output terminal b of the second transformer module 230 are always cut off, and the second transformer module 230 is always cut off. The output terminal b of the module 230 and the cathode of the first diode D1 are always conductive. This is described below from two possible embodiments.

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

FIG. 8 is a structural diagram of another power management circuit 20 provided by an embodiment of the present application. As shown in Figure 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 transformer 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, based on the reverse blocking characteristic of the second diode D2, the cathode of the first diode D1 and the output terminal b of the second transformer module 230 are always cut off. Therefore, when the first transformer module 210 is in the working state and the second transformer module 230 is in the inactive state, it is impossible to form a circuit starting from the output end b of the first transformer module 210 through the first diode D1 and the second transformer module 230 . The diode D2 and the first switch Q1 reach the leakage path of the ground line GND. In this way, abnormal voltage at the output terminal b of the first transformer module 210 can be prevented. At the same time, based on the forward conduction characteristics of the second diode D2, the output terminal b of the second transformer module 230 and the cathode of the first diode D1 are always connected, without affecting the second transformer module 230 It is connected in series with the second voltage stabilizing module 240 to form a power supply path.

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

FIG. 9 is a structural diagram of yet another power management circuit 20 provided by an 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 transformer 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 conducting and reverse blocking characteristics. Based on this, the voltage abnormality at the output terminal b of the first transformer module 210 can be prevented, and the second transformer module 230 and the second voltage stabilizing module 240 are connected in series to form a power supply path.

Figure 10 is a circuit diagram of a voltage follower 252 provided by 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 terminal of the first resistor R1 is the input terminal a of the voltage follower 252, and the second terminal of the first resistor R1 is connected to the non-inverting input terminal of the first comparator A1. The non-inverting input terminal of the first comparator A1 is also connected to the ground line GND through the 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 line 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 linear voltage regulator with one-way conduction, etc., which will not be described again.

In this possible implementation, a one-way 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 transformer module 230 are always cut off, and no additional control is required. devices and control logic, so the circuit implementation is simple, which is conducive to the saving of electronic components, thereby conducive to saving costs and improving circuit integration.

2. In the second possible implementation manner, the control module 250 is a two-way communication module. The control module 250 is turned off when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state; the control module 250 is turned on when the second transformer module 230 is in the working state.

In this possible implementation, as shown in FIG. 11 , the control module 250 may include a switch unit 254 capable of bidirectional conduction. The first terminal a of the switch unit 254 is connected to the output terminal b of the second transformer module 230 . The second terminal b of the switch 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 switch unit 254 is turned off when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state; the switch unit 254 is turned on when the second transformer module 230 is in the working state. Wherein, turning off the switch unit 254 means that the first terminal a and the second terminal b of the switch unit 254 are turned off; turning on the switch unit 254 means that there is a conduction between the first terminal a and the second terminal b of the switch unit 254. Pass. In this way, when the second transformer module 230 is in an inoperative state, the switch unit 254 is turned off, and at this time, it is impossible to form a circuit starting from the output end b of the first transformer module 210 through the first diode D1, the switch unit 254, The leakage path of the first switch Q1 reaches the ground GND. When the second transformer module 230 is in the working state, the output terminal b of the second transformer module 230 is connected to the input terminal a of the second voltage stabilizing module 240 through the switch unit 254, which does not affect the connection between the second transformer module 230 and the second voltage stabilizing module 240. The voltage stabilizing modules 240 are connected in series to form a power supply path.

Further, as shown in FIG. 12 , the control module 250 may also include a processing unit 256 . The output terminal d of the processing unit 256 is connected to the control terminal c of the switch unit 254. The processing unit 256 is configured to: when the first transformer module 210 is in the working state and the second transformer module 230 is in the inactive state, output a first level signal to the control terminal c of the switch unit 254. The first level signal It is used to control the switch unit 254 to turn off; when the second transformer module 230 is in the working state, it outputs a second level signal to the control terminal c of the switch unit 254, and the second level signal is used to control the switch unit 254 to turn on. Wherein, 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 a high level signal and a low level signal. Here, the processing unit 256 may be a SOC in the electronic device, or may be other electronic components with control functions in the electronic device other than the SOC. The output terminal d of the processing unit 256 may be a general purpose input/output port (GPIO).

The structure of the switch unit 254 in this implementation will be described below from two possible embodiments.

1. In a possible embodiment, as shown in Figure 13, the switch 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 (FET), specifically a metal oxide semiconductor field effect transistor (MOSFET). The first pole of the transistor Q3 is connected to the output terminal b of the second transformer module 230 . The second electrode 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 electrode of the transistor Q3 is one of the source electrode and the drain electrode of the transistor Q3, and the second electrode of the transistor Q3 is the other one of the source electrode and the drain electrode 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 turn-on and turn-off of the transistor Q3, that is, to control the turn-on and turn-off between the first electrode and the second electrode of the transistor Q3. Shut down. In some possible embodiments, transistor Q3 is an N-type MOSFET. At this time, the first level signal is a low level signal and is used to control the turn-off between the first and second poles of the transistor Q3; the second level signal is a high level signal and is used to control the third pole of the transistor Q3. There is continuity between one pole and the second pole. In other possible embodiments, the 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 Figure 14, the switch unit 254 includes a load switch 255. 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 transformer 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 and off of the load switch 255, that is, control the first terminal a and the second terminal a of the load switch 255. On and off between terminal b.

Figure 15 is a circuit diagram of a load switch 255 provided by 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 terminal of the fourth switch Q4 is the first terminal a of the load switch 255, and the second terminal of the fourth switch Q4 is the second terminal b of the load switch 255. The first terminal of the fifth switch Q5 is connected to the ground line 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 of the fourth switch Q4 and the control terminal. The control terminal of the fifth switch Q5 is the control terminal c of the load switch 255 .

When the load switch 255 is working, if the output terminal d of the processing unit 256 outputs a low-level signal, the fifth switch Q5 is turned on. At this time, the control terminal of the fourth switch Q4 inputs a low-level signal, and the fourth switch Q4 is turned off. , that is, the load switch 255 is turned off. That is to say, 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. At this time, if the second transformer module 230 outputs a voltage, then the control terminal of the fourth switch Q4 inputs a high-level signal, The fourth switch Q4 is turned on, that is, the load switch 255 is turned on. That is to say, the second level signal is a high level signal.

In this possible implementation, a two-way 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 transformer module 230 are in an indifferent position. It is turned off when in the working state, and turned on when the second transformer module 230 is in the working state. Based on this, when the second transformer module 230 is in the working state, if the voltage and current drawn by the load connected to the second voltage stabilizing module 240 is reduced, the excess voltage and current in the second voltage stabilizing module 240 can be It flows back to the second transformer module 230 to avoid the occurrence of oscillation current.

The circuit structure of the first transformer module 210 and the second transformer module 230 will be explained in detail below with reference to the accompanying drawings.

1. Circuit structure of the first transformer module 210.

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

Figure 16 is a circuit diagram of a first transformer module 210 provided by an embodiment of the present application. As shown in FIG. 16 , in this case, the first transformer 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 used to connect with the energy storage module. That is to say, the first terminal of the sixth switch Q6 is the input terminal a of the first transformer module 210 . The second terminal of the sixth switch Q6 is connected to the first terminal of the third inductor L3 and the first terminal of the seventh switch Q7. The second end of the third inductor L3 is connected to the input end a of the first voltage stabilizing module 220 . That is to say, the second terminal of the third inductor L3 is the output terminal b of the first transformer module 210 . The second terminal of the seventh switch Q7 is connected to the ground line 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 transformer module 210 is operating, the first controller 212 controls the voltage of the output terminal b of the first transformer module 210 by controlling the duty ratios of the sixth switch Q6 and the seventh switch Q7. Among them, the duty cycle of the switch (including the sixth switch Q6 and the seventh switch Q7) refers to the percentage of the switch's on-time duration to the total cycle time during a turn-on and turn-off cycle of the switch.

Specifically, when the first transformer module 210 shown in FIG. 16 is working, the first controller 212 can control the sixth switch Q6 to turn on and the seventh switch Q7 to turn off, thereby charging the third inductor L3. After the charging amount of the third inductor L3 reaches a certain value, the first controller 212 can control the sixth switch Q6 to turn off and the seventh switch Q7 to turn on, so that the third inductor L3 supplies power to the first voltage stabilizing module 220 . Such a cycle can make the voltage of the output terminal b of the first transformer module 210 smaller than the voltage of the energy storage module. During this process, the greater the duty cycle of the sixth switch Q6, the greater the voltage of the output terminal b of the first transformer module 210; conversely, the smaller the duty cycle of the sixth switch Q6, the greater the voltage of the first transformer module 210 The voltage at output terminal b is smaller.

The inverting input terminal of the second comparator A2 is used to input the reference voltage. The non-inverting input terminal of the second comparator A2 is connected to the second terminal of the third inductor L3 (the connection relationship is not shown in the figure). That is to say, the non-inverting input terminal of the second comparator A2 is the detection terminal c of the first transformer module 210 . In this 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 cycle of the sixth switch Q6 when receiving the high-level signal output by the second comparator A2; and increase the duty cycle when receiving the low-level signal output by the second comparator A2. Large duty cycle of sixth switch Q6.

In this way, when the voltage of the output terminal b of the first transformer module 210 is greater than the first preset voltage, the second comparator A2 will output a high-level signal. At this time, the first controller 212 reduces the occupancy of the sixth switch Q6. The empty ratio causes the voltage at the output terminal b of the first transformer module 210 to decrease. When the voltage of the output terminal b of the first transformer module 210 is less than the first preset voltage, the second comparator A2 will output a low-level signal. At this time, the first controller 212 increases the duty cycle of the sixth switch Q6 , causing the voltage of the output terminal b of the first transformer module 210 to increase.

It can be understood that in some specific embodiments, the first controller 212 and the processing unit 256 can be integrated into one body. That is to say, the function of the first controller 212 can also be implemented by the SOC or other electronic components with control functions in the electronic device.

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

Figure 17 is a circuit diagram of another first transformer module 210 provided by the embodiment of the present application. As shown in FIG. 17 , in this case, the first transformer 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 used to connect with the energy storage module. That is to say, the first terminal of the fourth inductor L4 is the input terminal a of the first transformer module 210 . The second terminal of the fourth inductor L4 is connected to the first terminal of the eighth switch Q8 and the first terminal of the ninth switch Q9. The second terminal of the eighth switch Q8 is connected to the ground line 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 to say, the second terminal of the ninth switch Q9 is the output terminal b of the first transformer module 210 .

The first controller 212 is connected to the control terminals of the eighth switch Q8 and the ninth switch Q9 to control the voltage of the output terminal b of the first transformer module 210 by controlling the duty cycles of the eighth switch Q8 and the ninth switch Q9 . In this embodiment, the first controller 212 can control the eighth switch Q8 to turn on and the ninth switch Q9 to turn off to charge the fourth inductor L4. After the charging amount of the fourth inductor L4 reaches a certain value, the first controller 212 can control the eighth switch Q8 to turn off and the ninth switch Q9 to turn on. At this time, the energy storage module and the fourth inductor L4 are connected in series to the first voltage regulator. Module 220 provides power. Such a cycle can make the voltage of the output terminal b of the first transformer module 210 greater than the voltage of the energy storage module. During this process, the greater the duty cycle of the eighth switch Q8, the greater the voltage of the output terminal b of the first transformer module 210; conversely, the smaller the duty cycle of the eighth switch Q8, the greater the voltage of the first transformer module 210. The voltage at output terminal b is smaller.

The inverting input terminal of the third comparator A3 is used to input the reference voltage. The non-inverting input terminal of the third comparator A3 is connected to the second terminal of the ninth switch Q9 (the connection relationship is not shown in the figure). That is to say, the non-inverting input terminal of the third comparator A3 is the detection terminal c of the first transformer module 210 . In this 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 cycle of the eighth switch Q8 when receiving the high-level signal output by the third comparator A3; and increase the duty cycle when receiving the low-level signal output by the third comparator A3. The duty cycle of the large eighth switch Q8 will not be described again.

2. Circuit structure of the second transformer module 230.

The second transformer module 230 is a buck circuit. As shown in Figure 18, in this case, the second transformer module 230 also includes a second switch Q2 and a first inductor L1. Wherein, the first end of the second switch Q2 is used to connect with the energy storage module. That is to say, the first terminal of the second switch Q2 is the input terminal a of the second transformer module 230 . The second terminal of the second switch Q2 is connected to the first terminal of the first switch Q1 and the first terminal of the first inductor L1. The second terminal of the first switch Q1 is used to be connected to the ground line GND. The second terminal of the first inductor L1 is connected to the first terminal a of the control module 250 . That is to say, 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 , the second transformer module 230 further includes a second controller 232 . The second controller 232 is connected to the control end of the first switch Q1 and the control end of the second switch Q2 to control the output end of the second transformer module 230 by controlling the duty cycles of the first switch Q1 and the second switch Q2. b voltage. In this embodiment, the second transformer module 230 can also be provided with a comparator to implement feedback adjustment, which will not be described again.

It can be understood that here we only take the second transformer module 230 as a buck circuit as an example to describe the circuit structure of the second transformer module 230 . In some other embodiments, the second transformer module 230 may also 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 this application arises because the normally closed first switch Q1 is connected between the output terminal b of the second transformer module 230 and the ground line GND. Therefore, the second transformer module 230 The first switch Q1 is connected between the output terminal b and the ground line GND, and the situation that the first switch Q1 is a normally closed switch should be understood to be within the protection scope of the embodiment of the present application.

It can be understood that in some specific embodiments, the second controller 232 and the processing unit 256 can be integrated into one body. That is to say, the function of the second controller 232 can also be implemented by the SOC or other electronic components with control functions in the electronic device.

The power management circuit 20 provided by the embodiment of the present application at least includes the following beneficial effects: 1. The control module 250 is used to: when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state, the The cathode of a diode D1 is cut off from the output terminal b of the second transformer module 230 . In this case, when the first transformer module 210 is in the working state and the second transformer module 230 is in the inoperative state, the output terminal b of the first transformer module 210 cannot pass through the first diode D1 and the second diode D1. The transformer module 230 is connected to the ground GND. In this way, abnormal voltage at the output terminal b of the first transformer module 210 can be prevented, thereby extending the service life of the electronic device. 2. The control module 250 can be a one-way conduction module, so that the cathode of the first diode D1 and the output terminal b of the second transformer module 230 are always cut off, without the need for additional control devices and control logic, so the circuit The implementation is simple and is conducive to saving electronic components, which is conducive to saving costs and improving circuit integration. 3. The control module 250 can be a bidirectional conduction module, so that the connection between the cathode of the first diode D1 and the output terminal b of the second transformer module 230 is turned off when the second transformer module 230 is in an inoperative state. The second transformer module 230 is turned on when in the working state. Based on this, when the second transformer module 230 is in the working state, if the voltage and current drawn by the load connected to the second voltage stabilizing module 240 is reduced, the excess voltage and current in the second voltage stabilizing module 240 can be It flows back to the second transformer module 230 to avoid the occurrence of oscillation current. 4. In the related art, in order to avoid abnormal voltage at the output terminal b of the first transformer module 210, the second transformer module 230 is usually discarded, causing the second voltage stabilizing module 240 to fail to work. The power management circuit 20 provided by the embodiment of the present application allows the second voltage stabilizing module 240 to operate normally, thereby improving the resource utilization of the power management circuit 20 and saving the cost of components required for electronic equipment.

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

In some embodiments, the power management chip also includes a packaging structure. The power management circuit 20 is encapsulated by the packaging structure.

FIG. 19 is an internal structure diagram of an electronic device 30 provided by an embodiment of the present application. As shown in Figure 19, this embodiment of the present application also provides an electronic device 30, including an energy storage module, and the power management circuit 20 or power management chip as described in any of the above 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 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 end b of the second voltage stabilizing module 240, so that the power supply path formed by the second transformer module 230, the control module 250, and the second voltage stabilizing module 240 in series supplies power to the second load 314.

The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still implement the above-mentioned implementations. The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions in the embodiments of this application, and should be included in within the protection scope of this application.

Claims (12)

1. A power management circuit, characterized in that the power management circuit includes 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 transformer module and the input end of the second transformer module are both used to connect to the energy storage module, and the output end of the first transformer module is connected to the input of the first voltage stabilizing module. The terminal is connected to the anode of the first diode, the detection terminal of the first transformer module is connected to the output terminal of the first transformer module, and the first transformer module is used to: when detecting the When the voltage at the output end of the first transformer module is less than the first preset voltage, increase the voltage at the output end of the first transformer module; The output end of the second transformer module is connected to the first end of the control module, and the second end of the control module is connected to the input end of the second voltage stabilizing module and the cathode of the first diode. Connection; the second transformer module includes a first switch connected between the output end of the second transformer module and the ground wire. When the second transformer module is in an inoperative state, the first switch conduction; The control module is used to: when the first transformer module is in a working state and the second transformer module is in an inoperative state, connect the cathode of the first diode to the second transformer module. The output terminals of the module are cut off. 2. The power management circuit of claim 1, wherein the control module is a one-way conduction module, the first end of the control module is an input end, and the second end of the control module is an output end. end. 3. The power management circuit of claim 2, wherein the control module includes a second diode, and the anode of the second diode is connected to the output end of the second transformer module, The cathode of the second diode is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode. 4. The power management circuit of claim 2, wherein the control module includes a voltage follower, an input end of the voltage follower is connected to an output end of the second transformer module, and the voltage The output terminal of the follower is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode. 5. The power management circuit of claim 1, wherein the control module includes a switch unit, a first end of the switch unit is connected to an output end of the second transformer module, and the switch unit The second end is connected to 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 transformer module is in a working state and the second transformer module is in an inoperative state; the switch unit is turned on when the second transformer module is in a working state. . 6. The power management circuit of claim 5, wherein the control module further includes: a processing unit, the output end of the processing unit is connected to the control end of the switch unit; The processing unit is configured to output a first level signal to the control end of the switch unit when the first transformer module is in a working state and the second transformer module is in an inactive state. The first level signal is used to control the switch unit to turn off; when the second transformer module is in the working state, a second level signal is output to the control end of the switch unit. The second level signal Used to control the conduction of the switch unit. 7. The power management circuit of claim 6, wherein the switch unit includes a transistor, a first pole of the transistor is connected to the output end of the second transformer module, and a second pole of the transistor The electrode is connected to the input terminal of the second voltage stabilizing module and the cathode of the first diode, and the control electrode of the transistor is connected to the output terminal of the processing unit. 8. The power management circuit of claim 6, wherein the switch unit includes a load switch, a first end of the load switch is connected to the output end of the second transformer module, and the load switch The second end is connected to 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 to the output end of the processing unit. 9. The power management circuit according to any one of claims 1 to 8, wherein the second transformer module further includes: a second switch and an inductor; The first end of the second switch is used to connect to the energy storage module, and the second end of the second switch is connected to the first end of the first switch and the first end of the inductor. The second end of the first switch is connected to the ground wire, and the second end of the inductor is connected to the first end of the control module. 10. A power management chip, characterized by comprising the power management circuit according to any one of claims 1 to 9. 11. An electronic device, characterized by comprising an energy storage module, and a power management circuit according to any one of claims 1 to 9 or a power management chip according to claim 10. 12. The electronic device of claim 11, wherein the electronic device further includes a first load and a second load; The first load is connected to the output end of the first voltage stabilizing module, and the second load is connected to the output end of the second voltage stabilizing module.