Charging and discharging circuit, power management chip and electronic equipment

Abstract

The utility model relates to a charging and discharging circuit, a power management chip and electronic equipment. The charging and discharging circuit comprises a first switching circuit, wherein the first end of the first switching circuit is used for being coupled with a first load; the first end of the second switch circuit is used for being coupled with a charging interface; the first end of the inductor is coupled with the second end of the first switching circuit and the second end of the second switching circuit, and the second end of the inductor is used for being coupled with a battery; wherein the first switching circuit and the inductor form a booster circuit, the booster circuit is used for boosting the voltage of the battery to supply power to the first load, the second switching circuit and the inductor form a step-down circuit, and the step-down circuit is used for reducing the voltage of the charging interface to charge the battery. By multiplexing the inductor, the number of devices in the charging and discharging circuit can be reduced under the condition that the battery needs to be subjected to step-down charging and step-up discharging, so that the complexity of the charging and discharging circuit structure is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of charging and discharging, and particularly relates to a charging and discharging circuit, a power management chip and an electronic device. BACKGROUND

[0002] A charging and discharging circuit is arranged in an electronic device, and the charging and discharging circuit is used to charge a battery and discharge the battery. However, since the charging and discharging circuit has both charging and discharging functions, a large number of devices need to be arranged, and there is a problem of complex structure. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the problems in the prior art, the present disclosure provides a charging and discharging circuit, a power management chip and an electronic device.

[0004] According to a first aspect of the present disclosure, a charging and discharging circuit is provided, and the charging and discharging circuit comprises:

[0005] a first switch circuit, a first end of the first switch circuit being configured to be coupled with a first load;

[0006] a second switch circuit, a first end of the second switch circuit being configured to be coupled with a charging interface;

[0007] an inductor, a first end of the inductor being coupled with a second end of the first switch circuit and a second end of the second switch circuit, and a second end of the inductor being configured to be coupled with a battery;

[0008] wherein the first switch circuit and the inductor constitute a boost circuit, the boost circuit being configured to increase a voltage of the battery to supply power to the first load, and the second switch circuit and the inductor constitute a buck circuit, the buck circuit being configured to decrease a voltage of the charging interface to charge the battery.

[0009] In some embodiments of the present disclosure, the first switch circuit comprises:

[0010] a first switch unit, a first end of the first switch unit being configured to be coupled with the first load, and a second end of the first switch unit being coupled with a first end of the inductor;

[0011] a second switch unit, a first end of the second switch unit being coupled with the second end of the first switch unit and the first end of the inductor, and a second end of the second switch unit being configured to be coupled with a ground end.

[0012] In some embodiments of the present disclosure, the second switch circuit comprises:

[0013] a third switch unit, a first end of the third switch unit being coupled with a second end of the first switch unit and a first end of the inductor, and a second end of the third switch unit being configured to be coupled with a ground terminal;

[0014] a fourth switch unit, a first end of the fourth switch unit being configured to be coupled with the charging interface, and a second end of the fourth switch unit being coupled with the first end of the third switch unit and the first end of the inductor.

[0015] In some embodiments of the present disclosure, the second switch unit and the third switch unit are the same switch unit.

[0016] In some embodiments of the present disclosure, the boost circuit is a boost circuit with a bypass, and a third end of the first switch circuit is coupled with a second end of the inductor and the battery.

[0017] In some embodiments of the present disclosure, the boost circuit further comprises:

[0018] a fifth switch unit, a first end of the fifth switch unit being configured to be coupled with the first load, and a second end of the fifth switch unit being coupled with the second end of the inductor and the battery.

[0019] In some embodiments of the present disclosure, when the voltage of the battery is greater than a preset voltage and the charging interface is not connected to a charging device, the first switch unit and the second switch unit are in an off state and the fifth switch unit is in an on state; when the voltage of the battery is less than or equal to the preset voltage and the charging interface is not connected to the charging device, the first switch unit and the second switch unit are in an alternating on state and the fifth switch unit is in an off state.

[0020] In some embodiments of the present disclosure, the second end of the inductor is further configured to be coupled with a second load;

[0021] wherein a working voltage range of the first load is less than a working voltage range of the second load.

[0022] In some embodiments of the present disclosure, the charge and discharge circuit further comprises:

[0023] a sixth switch unit, the sixth switch unit being coupled between the charging interface and a first end of the second switch circuit.

[0024] In some embodiments of the present disclosure, the charge and discharge circuit further comprises:

[0025] a seventh switch unit, the seventh switch unit being coupled between the second end of the inductor and the battery.

[0026] In some embodiments of the present disclosure, the charge-discharge circuit further comprises:

[0027] a control circuit coupled with the first switch circuit and the second switch circuit, the control circuit configured to control operating states of the first switch circuit and the second switch circuit.

[0028] According to a second aspect of the present disclosure, a power management chip is provided, which comprises the charge-discharge circuit as described above.

[0029] According to a third aspect of the present disclosure, an electronic device is provided, which comprises the charge-discharge circuit as described above or the power management chip as described above.

[0030] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects:

[0031] The charge-discharge circuit comprises a first switch circuit, a second switch circuit and an inductor. The first switch circuit is coupled between the first load and the inductor, the second switch circuit is coupled between the charging interface and the inductor, and the inductor is coupled between the first switch circuit and the battery and between the second switch circuit and the battery, respectively. Since the inductor can form a boost circuit with the first switch circuit and a buck circuit with the second switch circuit, the inductor is multiplexed. By multiplexing the inductor, the number of devices in the charge-discharge circuit can be reduced when the battery needs to be charged and discharged, thereby reducing the complexity of the structure of the charge-discharge circuit.

[0032] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0034] Figure 1 is a structural schematic diagram of a charge-discharge circuit;

[0035] Figure 2 is a structural schematic diagram of a charge-discharge circuit provided by an exemplary embodiment of the present disclosure;

[0036] Figure 3 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0037] Figure 4 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0038] Figure 5 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0039] Figure 6 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0040] Figure 7 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0041] Figure 8 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0042] Figure 9 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0043] Figure 10 is a structural schematic diagram of a charge-discharge circuit provided by another exemplary embodiment of the present disclosure;

[0044] Figure 11 is a system block diagram of an electronic device provided by an exemplary embodiment of the present disclosure.

[0045] in the figure:

[0046] 10 - first switch circuit; 20 - second switch circuit; 30 - first load; 40 - second load; 50 - control circuit; Load - load; T1 - first switch unit; T2 - second switch unit; T3 - fourth switch unit; T4 - fifth switch unit; T5 - sixth switch unit; T6 - seventh switch unit; Q1 - first transistor; Q2 - second transistor; Q3 - third transistor; Q4 - fourth transistor; Q5 - fifth transistor; Q6 - sixth transistor; Q7 - seventh transistor; L - inductor; L1 - first inductor; L2 - second inductor; Vbus - charging interface; Vbat - battery; GND - ground terminal; 400 - electronic device; 402 - processing component; 404 - memory; 406 - power supply component; 408 - multimedia component; 410 - audio component; 412 - input / output interface; 414 - sensor component; 416 - communication component; 420 - processor. DETAILED DESCRIPTION

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0048] The shutdown voltage of an electronic device refers to the minimum voltage required for the device to operate normally. When the battery voltage falls below the shutdown voltage, the electronic device may malfunction. Therefore, the electronic device will automatically shut down when the battery voltage drops below the shutdown voltage to protect it.

[0049] In related technologies, a charging and discharging circuit is provided, such as... Figure 1 As shown, the charging / discharging circuit includes a buck circuit, a boost circuit, and a charge / discharge selection circuit. The buck circuit includes a first transistor Q1, a second transistor Q2, and a first inductor L1. The boost circuit includes a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a second inductor L2. The charge / discharge selection circuit includes a sixth transistor Q6 and a seventh transistor Q7. The first terminal of the sixth transistor Q6 is coupled to the charging interface Vbus, and the second terminal of the sixth transistor Q6 is coupled to the first terminal of the first transistor Q1. The second terminal of the first transistor Q1 is coupled to the first terminals of the second transistor Q2 and the first inductor L1. The second terminal of the second transistor Q2 is coupled to the ground terminal GND. The second terminal of the first inductor L1 is coupled to the first terminals of the seventh transistor Q7, the third transistor Q3, and the second inductor L2. The second terminal of the seventh transistor Q7 is coupled to the battery Vbat. The second terminal of the third transistor Q3 is coupled to the first terminal of the fourth transistor Q4 and the load Load. The second terminal of the fourth transistor Q4 is coupled to the second terminal of the second inductor L2 and the first terminal of the fifth transistor Q5. The second terminal of the fifth transistor Q5 is coupled to the ground terminal GND. In the buck circuit, the first inductor L1 is charged and discharged by switching the first transistor Q1 and the second transistor Q2 on and off, thereby enabling the charging device to charge the battery Vbat at a reduced voltage through the charging interface Vbus. In the boost circuit, the second inductor L2 is charged and discharged by switching the fourth transistor Q4 and the fifth transistor Q5 on and off, thereby increasing the voltage of the battery Vbat to supply power to the load Load, thus increasing the battery life of the electronic device. However, due to the large number of components in the charging and discharging circuit and the independence of the boost and buck circuits, the structure of the charging and discharging circuit is complex.

[0050] Based on this, the present disclosure provides a charging and discharging circuit, a boost circuit and a buck circuit in the charging and discharging circuit share one inductor, compared with setting one inductor in the boost circuit and the buck circuit to realize corresponding functions, the number of inductors in the charging and discharging circuit is reduced to reduce the complexity of the structure of the charging and discharging circuit.

[0051] An example embodiment of the present disclosure provides a charging and discharging circuit, as shown in the figure, Figure 2 The charging and discharging circuit includes a first switching circuit 10, a second switching circuit 20 and an inductor L. The first end of the first switching circuit 10 is used to be coupled with a first load 30. The first end of the second switching circuit 20 is used to be coupled with a charging interface Vbus. The first end of the inductor L is coupled with the second end of the first switching circuit 10 and the second end of the second switching circuit 20, and the second end of the inductor L is used to be coupled with a battery Vbat. Among them, the first switching circuit 10 and the inductor L constitute a boost circuit, the boost circuit is used to raise the voltage of the battery Vbat to supply power to the first load 30, and the second switching circuit 20 and the inductor L constitute a buck circuit, the buck circuit is used to reduce the voltage of the charging interface Vbus to charge the battery Vbat.

[0052] In this embodiment, the charging and discharging circuit includes a first switching circuit, a second switching circuit and an inductor. The first switching circuit is coupled between the first load and the inductor, the second switching circuit is coupled between the charging interface and the inductor, and the inductor is coupled between the first switching circuit and the battery and between the second switching circuit and the battery respectively. Since the inductor can form a boost circuit with the first switching circuit and a buck circuit with the second switching circuit, the inductor is multiplexed. By multiplexing the inductor, the number of devices in the charging and discharging circuit can be reduced when the battery needs to be buck charged and boost discharged, thereby reducing the complexity of the structure of the charging and discharging circuit.

[0053] In an embodiment, as shown in the figure, Figure 3 The first switching circuit 10 includes a first switching unit T1 and a second switching unit T2. The first end of the first switching unit T1 is used to be coupled with the first load 30, and the second end of the first switching unit T1 is coupled with the first end of the inductor L. The first end of the second switching unit T2 is coupled with the second end of the first switching unit T1 and the first end of the inductor L, and the second end of the second switching unit T2 is used to be coupled with the ground terminal GND.

[0054] In this embodiment, since the structure of the first switching unit and the second switching unit is simple, the boost circuit is formed by the first switching unit, the second switching unit and the inductor, which reduces the complexity of the structure of the charging and discharging circuit. Moreover, by controlling the first switching unit and the second switching unit to conduct alternately, the charging and discharging of the inductor can be realized, thereby reducing the complexity of the control of the charging and discharging circuit.

[0055] For example, when the first switch unit T1 is off and the second switch unit T2 is on, the battery Vbat charges the inductor L. When the first switch unit T1 is on and the second switch unit T2 is off, the battery Vbat and the inductor L discharge the first load 30.

[0056] For example, the first switch unit T1 and the second switch unit T2 can be transistors. In the case where the first switch unit T1 and the second switch unit T2 are N-type field effect transistors, the first end of the first switch unit T1 is a drain, and the second end of the first switch unit T1 is a source. The first end of the second switch unit T2 is a drain, and the second end of the second switch unit T2 is a source.

[0057] In an embodiment, the second switch circuit 20 includes a third switch unit and a fourth switch unit T3. The first end of the third switch unit is coupled to the second end of the first switch unit T1 and the first end of the inductor L, and the second end of the third switch unit is configured to be coupled to the ground terminal GND. The first end of the fourth switch unit T3 is configured to be coupled to the charging interface Vbat, and the second end of the fourth switch unit T3 is coupled to the first end of the third switch unit and the first end of the inductor L.

[0058] In the embodiment, since the third switch unit and the fourth switch unit have simple structures, a step-down circuit is formed by the third switch unit, the fourth switch unit and the inductor, thereby reducing the complexity of the structure of the charging and discharging circuit. Moreover, by controlling the third switch unit and the fourth switch unit to be alternately on, the charging and discharging of the inductor can be realized, thereby reducing the complexity of the control of the charging and discharging circuit.

[0059] In an embodiment, the second switch unit T2 and the third switch unit are the same switch unit.

[0060] In the embodiment, since the second switch unit can form a step-up circuit with the first switch unit and the inductor, and can form a step-down circuit with the fourth switch unit and the inductor, the step-up circuit and the step-down circuit can reuse the second switch unit. By reusing the second switch unit, the number of devices in the charging and discharging circuit can be reduced in the case where the battery needs to be charged by step-down and discharged by step-up, thereby reducing the complexity of the structure of the charging and discharging circuit. Moreover, since the second switch unit and the fourth switch unit have simple structures, a step-down circuit is formed by the second switch unit, the fourth switch unit and the inductor, thereby reducing the complexity of the structure of the charging and discharging circuit. In addition, by controlling the second switch unit and the fourth switch unit to be alternately on, the charging and discharging of the inductor can be realized, thereby reducing the complexity of the control of the charging and discharging circuit.

[0061] For example, when the second switch unit T2 is open and the fourth switch unit T3 is open, the charging device charges the inductor L through the charging interface Vbus. When the second switch unit T2 is open and the fourth switch unit T3 is open, the inductor L discharges to the battery Vbat.

[0062] For example, the fourth switching unit T3 can be a transistor. Specifically, when the fourth switching unit T3 is an N-type field-effect transistor, the first terminal of the fourth switching unit T3 is the drain, and the second terminal of the fourth switching unit T3 is the source.

[0063] In one embodiment, such as Figure 4 As shown, the boost circuit is a boost circuit with bypass. The third terminal of the first switching circuit 10 is coupled to the second terminal of the inductor L and the battery Vbat.

[0064] In this embodiment, since the boost circuit is a boost circuit with a bypass, the battery can either directly supply power to the first load through the bypass, or it can boost the battery voltage before supplying power to the first load. With different battery voltages, the battery can supply power to the first load in multiple ways, improving the reliability of the charging and discharging circuit.

[0065] In one embodiment, such as Figure 5 As shown, the boost circuit also includes a fifth switching unit T4. The first terminal of the fifth switching unit T4 is used to couple to the first load 30, and the second terminal of the fifth switching unit T4 is coupled to the second terminal of the inductor L and the battery Vbat.

[0066] In this embodiment, due to the simple structure of the fifth switching unit, the bypass of the boost circuit with a bypass is formed by the fifth switching unit, reducing the complexity of the boost circuit structure. Moreover, because the fifth switching unit has low conduction loss, the loss of the charging and discharging circuit can be reduced when the battery directly supplies power to the first load through the bypass.

[0067] For example, the fifth switching unit T4 can be a transistor. Specifically, when the fifth switching unit T4 is an N-type field-effect transistor, the first terminal of the fifth switching unit T4 is the drain, and the second terminal of the fifth switching unit T4 is the source.

[0068] In one embodiment, when the voltage of battery Vbat is greater than a preset voltage and the charging interface Vbus is not connected to a charging device, the first switch unit T1 and the second switch unit T2 are in the off state and the fifth switch unit T4 is in the on state. When the voltage of battery Vbat is less than or equal to the preset voltage and the charging interface Vbus is not connected to a charging device, the first switch unit T1 and the second switch unit T2 are in an alternating on state and the fifth switch unit T4 is in the off state.

[0069] In the embodiment, when the voltage of the battery is greater than the preset voltage, the voltage of the battery can enable the first load to operate stably. By enabling the first switch unit and the second switch unit to be in the off state and the fifth switch unit to be in the on state, the battery can supply power to the first load directly through the bypass, thereby reducing the loss of the charge-discharge circuit. When the voltage of the battery is less than the preset voltage, the voltage of the battery cannot enable the first load to operate stably. By enabling the first switch unit and the second switch unit to be in the alternating on state and the fifth switch unit to be in the off state, the battery supplies power to the first load after the voltage of the battery is increased by the boost circuit, so as to increase the endurance of the electronic device. By controlling the on-off of the first switch unit, the second switch unit and the fifth switch unit according to the voltage of the battery, the battery can supply power to the first load in an appropriate manner, thereby improving the reliability of the charge-discharge circuit.

[0070] For example, the preset voltage can be the shutdown voltage of the electronic device. The preset voltage can be 3.5 V, 3.6 V, 3.7 V or the like.

[0071] In an embodiment, as shown in Figure 6 The second end of the inductor L is also used for coupling with the second load 40. The working voltage range of the first load 30 is less than the working voltage range of the second load 40.

[0072] In the embodiment, the working voltage range of the first load is relatively narrow, and the first load can operate stably only when the voltage of the battery is relatively high. The working voltage range of the second load is relatively wide, and the second load can operate stably even when the voltage of the battery is relatively low. By coupling the second load with the inductor, the additional loss caused by the boost circuit is avoided, thereby reducing the power consumption of the charge-discharge circuit.

[0073] For example, the second load 40 can also be coupled with the first end of the first switch circuit 10.

[0074] In an embodiment, as shown in Figure 7 The charge-discharge circuit further includes a sixth switch unit T5. The sixth switch unit T5 is coupled between the charging interface Vbus and the first end of the second switch circuit 20.

[0075] In the embodiment, by enabling the sixth switch unit to be in the on state or the off state, the charging device can charge the battery or stop charging the battery, thereby reducing the complexity of the control of the charge-discharge circuit. Moreover, when the battery is fully charged, the sixth switch unit can be turned off to stop the charging device from continuing to charge the battery, thereby avoiding damage to the battery caused by overcharging, and improving the service life of the battery.

[0076] For example, the first end of the sixth switch unit T5 is used for coupling with the charging interface Vbus, and the second end of the sixth switch unit T5 is coupled with the first end of the second switch circuit 20.

[0077] Exemplarily, the sixth switch unit T5 can be a transistor. In the case that the sixth switch unit T5 is an N-type field effect transistor, the first end of the sixth switch unit T5 is a drain, and the second end of the sixth switch unit T5 is a source.

[0078] In an embodiment, as shown in FIG. 1, the charge-discharge circuit further comprises a seventh switch unit T6. The seventh switch unit T6 is coupled between the second end of the inductor L and the battery Vbat. Figure 8

[0079] In the embodiment, by arranging the seventh switch unit, the charging device can charge the battery through the seventh switch unit, and the battery can supply power to the first load through the seventh switch unit. By multiplexing the seventh switch unit for charge-discharge control, the number of switch units is reduced, thereby reducing the complexity of the structure of the charge-discharge circuit.

[0080] Exemplarily, the first end of the seventh switch unit T6 is used for being coupled with the battery Vbat, and the second end of the seventh switch unit T6 is coupled with the second end of the inductor L.

[0081] Exemplarily, the seventh switch unit T6 can be a transistor. In the case that the seventh switch unit T6 is an N-type field effect transistor, the first end of the seventh switch unit T6 is a source, and the second end of the seventh switch unit T6 is a drain.

[0082] Exemplarily, in the case that the charging interface Vbus accesses the charging device, the second switch unit T2 and the fourth switch unit T3 are in an alternating conduction state, and the fifth switch unit T4, the sixth switch unit T5 and the seventh switch unit T6 are all in a conduction state. The charging device supplies power to the step-down circuit through the sixth switch unit T5. The step-down circuit charges the battery Vbat through the seventh switch unit T6, the step-down circuit supplies power to the first load 30 through the fifth switch unit T4, and the step-down circuit supplies power to the second load 40.

[0083] In an embodiment, as shown in FIG. 1, the charge-discharge circuit further comprises a control circuit 50. The control circuit 50 is coupled with the first switch circuit 10 and the second switch circuit 20, and the control circuit 50 is used for controlling the operating state of the first switch circuit 10 and the second switch circuit 20. Figure 9

[0084] ​​In this embodiment, by coupling the control circuit to both the first and second switching circuits, the control circuit can either turn on the first switching circuit and turn off the second switching circuit to allow the battery to supply power to the first load through the boost circuit, or turn off the first switching circuit and turn on the second switching circuit to allow the charging device to charge the battery through the buck circuit. By controlling the charging and discharging circuit through the control circuit and switching the battery's charging and discharging states, the reliability of the charging and discharging circuit is improved.

[0085] For example, when the charging and discharging circuit includes a first switching unit T1, a second switching unit T2, a fourth switching unit T3, a fifth switching unit T4, a sixth switching unit T5, and a seventh switching unit T6, the multiple control terminals of the control circuit 50 can be coupled to the control terminals of the first switching unit T1, the second switching unit T2, the fourth switching unit T3, the fifth switching unit T4, the sixth switching unit T5, and the seventh switching unit T6, respectively.

[0086] An exemplary embodiment of this disclosure provides a charging and discharging circuit, such as Figure 10 As shown, the charging and discharging circuit includes a first switching unit T1, a second switching unit T2, a fourth switching unit T3, a fifth switching unit T4, a sixth switching unit T5, a seventh switching unit T6, an inductor L, and a control circuit 50. The first terminal of the first switching unit T1 is coupled to the first terminal of the fifth switching unit T4 and the first load 30. The second terminal of the first switching unit T1 is coupled to the first terminals of the inductor L, the second switching unit T2, and the fourth switching unit T3. The second terminal of the second switching unit T2 is coupled to the ground terminal GND. The first terminal of the fourth switching unit T3 is coupled to the second terminal of the sixth switching unit T5. The second terminal of the fifth switching unit T4 is coupled to the second terminals of the inductor L, the seventh switching unit T6, and the second load 40. The first terminal of the sixth switching unit T5 is coupled to the charging interface Vbus, and the first terminal of the seventh switching unit T6 is coupled to the battery Vbat. The control circuit 50 is coupled to the control terminals of the first switch unit T1, the second switch unit T2, the fourth switch unit T3, the fifth switch unit T4, the sixth switch unit T5, and the seventh switch unit T6, respectively.

[0087] The working principle of the charging and discharging circuit is explained by way of example:

[0088] When the voltage of the battery Vbat is greater than the preset voltage and the charging interface Vbus is not connected to the charging device, the control circuit 50 controls the first switch unit T1, the second switch unit T2, the fourth switch unit T3 and the sixth switch unit T5 to be all turned off, and controls the fifth switch unit T4 and the seventh switch unit T6 to be all turned on. The battery Vbat supplies power to the first load 30 through the seventh switch unit T6 and the fifth switch unit T4, and supplies power to the second load 40 through the seventh switch unit T6. When the voltage of the battery Vbat is less than or equal to the preset voltage and the charging interface Vbus is not connected to the charging device, the control circuit 50 controls the fourth switch unit T3, the fifth switch unit T4 and the sixth switch unit T5 to be all turned off, and controls the first switch unit T1 and the second switch unit T2 to be turned on alternately and controls the seventh switch unit T6 to be turned on. The battery supplies power to the first load 30 through the voltage-boosting circuit composed of the first switch unit T1, the second switch unit T2 and the inductor L, and supplies power to the second load 40 through the seventh switch unit T6.

[0089] When the charging interface Vbus is connected to the charging device, the control circuit 50 controls the first switch unit T1 to be turned off, controls the fifth switch unit T4, the sixth switch unit T5 and the seventh switch unit T6 to be all turned on, and controls the second switch unit T2 and the fourth switch unit T3 to be turned on alternately. The battery reduces the voltage input by the charging device through the voltage-reducing circuit composed of the second switch unit T2, the fourth switch unit T3 and the inductor L to the system voltage, so as to charge the battery Vbat through the seventh switch unit T6, supply power to the first load 30 through the fifth switch unit T4 and supply power to the second load 40. When the voltage of the battery Vbat is less than or equal to the preset voltage, the control circuit 50 controls the seventh switch unit T6, and the seventh switch unit T6 enters the linear working zone. Since the seventh switch unit T6 enters the linear working zone, the system voltage is the stable voltage U1. When the voltage of the battery Vbat is greater than the preset voltage, the control circuit 50 controls the seventh switch unit T6, and the seventh switch unit T6 enters the full-conduction working zone. Since the seventh switch unit T6 enters the full-conduction working zone, the system voltage is the variable system voltage U2. If the battery voltage is U3, the system voltage is U2, the charging current of the voltage-reducing circuit is I and the impedance of the seventh switch unit T6 is R at this time, then U2=U3+IR.

[0090] In one exemplary embodiment, a power management chip is provided, which includes the charging and discharging circuit as described above.

[0091] In this embodiment, by setting a power management chip including both a step-down circuit and a step-up circuit in the electronic device, the number of chips in the electronic device is reduced relative to setting a power management chip including a step-down circuit and a power management chip including a step-up circuit in the electronic device, thereby reducing the complexity of the structure of the electronic device.

[0092] In one example embodiment, an electronic device, such as a mobile phone, a notebook computer, a tablet computer, a wearable device, or the like, is provided. The electronic device includes the charge-discharge circuit as described above.

[0093] In one example embodiment, an electronic device, such as a mobile phone, a notebook computer, a tablet computer, a wearable device, or the like, is provided. The electronic device includes the power management chip as described above.

[0094] Reference Figure 11 As shown, the electronic device 400 can include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input / output (I / O) interface 412, a sensor component 414, and a communication component 416.

[0095] The processing component 402 usually controls overall operations of the electronic device 400, such as operations associated with display, phone call, data communication, camera operation, and recording operation. The processing component 402 can include one or more processors 420 to execute instructions to complete all or part of steps of the methods described above. In addition, the processing component 402 can include one or more modules to facilitate the interaction between the processing component 402 and other components. For example, the processing component 402 can include a multimedia module to facilitate the interaction between the multimedia component 408 and the processing component 402.

[0096] The memory 404 is configured to store various types of data to support operations of the electronic device 400. Examples of the data include instructions for any application or method operating on the electronic device 400, contact data, phonebook data, messages, pictures, videos, and the like. The memory 404 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0097] The power component 406 provides power to the various components of the electronic device 400. The power component 406 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the electronic device 400.

[0098] The multimedia component 408 includes a screen providing an output interface between the electronic device 400 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 408 includes a front camera module and / or a rear camera module. The front camera module and / or the rear camera module can receive external multimedia data when the electronic device 400 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera module and the rear camera module can be a fixed optical lens system or have a focal length and optical zoom capability.

[0099] The audio component 410 is configured to output and / or input an audio signal. For example, the audio component 410 includes a microphone (MIC) configured to receive an external audio signal when the electronic device 400 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 404 or transmitted via the communication component 416. In some embodiments, the audio component 410 further includes a speaker for outputting an audio signal.

[0100] The I / O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0101] The sensor component 414 includes one or more sensors for providing status assessments for various aspects of the electronic device 400. For example, the sensor component 414 can detect an open / closed position of the electronic device 400, relative positioning of components, such as a display and a keypad of the electronic device 400, a change in position of the electronic device 400 or a component of the electronic device 400, presence or absence of user contact with the electronic device 400, orientation or acceleration / deceleration / g-force and temperature changes of the electronic device 400. The sensor component 414 can include an accelerometer for measuring a change in momentum vector of the electronic device 400. The sensor component 414 can include a proximity sensor configured to detect presence of nearby objects without any physical contact. The sensor component 414 can further include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 414 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0102] The communication component 416 is configured to facilitate wired or wireless communication between the electronic device 400 and another terminal. The electronic device 400 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an example embodiment, the communication component 416 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 416 can further include a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) techniques, Infrared Data Association (IrDA) techniques, Ultra-WideBand (UWB) techniques, Bluetooth (BT) techniques, and other techniques.

[0103] In an example embodiment, the electronic device 400 can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing terminals (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements.

[0104] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction, if necessary.

[0105] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the disclosure, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0106] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility disclosed herein. The disclosure is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the present disclosure that come within known, accepted, or customary practice in the art to which the disclosure pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the disclosure are indicated by the claims.

[0107] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A charge-discharge circuit characterized by comprising: The charging and discharging circuit includes: A first switching circuit, wherein a first terminal of the first switching circuit is used to couple with a first load; The second switching circuit, the first end of which is used to couple with the charging interface; An inductor, wherein a first end of the inductor is coupled to a second end of both the first switching circuit and the second switching circuit, and the second end of the inductor is used to couple to a battery; The first switching circuit and the inductor form a boost circuit, which is used to increase the voltage of the battery to supply power to the first load. The second switching circuit and the inductor form a buck circuit, which is used to decrease the voltage of the charging interface to charge the battery.

2. The charge and discharge circuit according to claim 1, characterized by, The first switching circuit includes: A first switching unit, wherein a first end of the first switching unit is used to be coupled to the first load, and a second end of the first switching unit is coupled to the first end of the inductor; The second switching unit has a first end coupled to the second end of the first switching unit and the first end of the inductor, and the second end of the second switching unit is used to couple to the ground terminal.

3. The charge and discharge circuit according to claim 2, wherein The second switching circuit includes: The third switching unit has a first end coupled to the second end of the first switching unit and the first end of the inductor, and the second end of the third switching unit is used to be coupled to the ground terminal. The fourth switching unit has a first end that is coupled to the charging interface, and a second end that is coupled to the first end of the third switching unit and the first end of the inductor.

4. The charge and discharge circuit according to claim 3, wherein The second switching unit and the third switching unit are the same switching unit.

5. The charge and discharge circuit according to claim 2, wherein The boost circuit is a boost circuit with a bypass, and the third terminal of the first switching circuit is coupled to the second terminal of the inductor and the battery.

6. The charge and discharge circuit according to claim 5, wherein The boost circuit also includes: The fifth switching unit has a first end for coupling with the first load, and a second end for coupling with both the second end of the inductor and the battery.

7. The charge and discharge circuit according to claim 6, wherein When the battery voltage is greater than the preset voltage and the charging interface is not connected to a charging device, the first switch unit and the second switch unit are in the off state and the fifth switch unit is in the on state; when the battery voltage is less than or equal to the preset voltage and the charging interface is not connected to the charging device, the first switch unit and the second switch unit are in the alternating on state and the fifth switch unit is in the off state.

8. The charge and discharge circuit according to claim 1, wherein The second end of the inductor is also used to couple with a second load; The operating voltage range of the first load is smaller than that of the second load.

9. The charge and discharge circuit according to claim 1, wherein The charging and discharging circuit also includes: A sixth switching unit is coupled between the charging interface and the first terminal of the second switching circuit.

10. The charge and discharge circuit according to claim 1, wherein The charging and discharging circuit also includes: A seventh switching unit is coupled between the second terminal of the inductor and the battery.

11. The charge and discharge circuit according to any one of claims 1 to 10, wherein The charging and discharging circuit also includes: A control circuit is coupled to both the first and second switching circuits, and the control circuit is used to control the operating state of the first and second switching circuits.

12. A power management chip, characterized in that, The power management chip includes the charging and discharging circuit as described in any one of claims 1 to 11.

13. An electronic device, characterized in that, The electronic device includes a charging / discharging circuit as described in any one of claims 1 to 11 or a power management chip as described in claim 12.

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