CN214124856U

CN214124856U - Mobile power supply

Info

Publication number: CN214124856U
Application number: CN202022197652.2U
Authority: CN
Inventors: 王明乐; 夏原野; 宁志华; 郭瑭瑭
Original assignee: Hangzhou Silan Microelectronics Co Ltd
Current assignee: Hangzhou Silan Microelectronics Co Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-09-03
Anticipated expiration: 2030-09-29

Abstract

The utility model discloses a mobile power supply, including direct current source circuit, interface circuit, DC-DC converting circuit, control circuit, selection circuit and supply circuit, selection circuit provides first direct current voltage to supply circuit when the group battery discharges, perhaps provides second direct current voltage to supply circuit when the group battery charges, and supply circuit converts the first direct current voltage or the second direct current voltage that receive into supply voltage, to control circuit supplies power, can avoid when first direct current voltage and second direct current voltage change at wide voltage range, and the emergence of the power supply loss of the control circuit that causes is big partially or the not enough condition of supply voltage can be realized in wide input voltage range, and the supply voltage of mobile power supply inner circuit all remains invariable basically, satisfies wide voltage range's requirement.

Description

Mobile power supply

Technical Field

The utility model relates to a power technical field, more specifically relate to a portable power source.

Background

With the development of science and technology, various electronic products mainly including mobile phones are widely applied to production and life. Due to the limitation of battery technology, the battery capacity of electronic products is limited, and the electronic products are often required to be charged in the using process, which is very inconvenient. Therefore, the mobile power supply product is produced at the same time, so that people can charge the electronic product at any time and any place.

The mobile power supply typically requires at least one dc voltage that is used to power the various control circuits and protocol identification circuits in the mobile power supply. The dc voltage may be an output voltage of a battery pack incorporated in the portable power supply or an output voltage of a power adapter.

For the battery pack built in the mobile power supply, the voltages at two ends of the battery pack change within a certain range in the use process, and the voltages at two ends of the built-in battery pack of the mobile power supply with different capacities are different; as for the output voltage of the power adapter, with the popularization of the rapid charging protocol, most power adapters in the market support wide voltage range output. Therefore, in the case of a voltage variation across the battery pack or an output voltage variation of the adapter, the power supply voltage of the mobile power supply may also be higher or lower than the operating voltage required by the control circuit and the protocol identification circuit therein, resulting in a reduction in the efficiency of the entire mobile power supply system.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a portable power source, which can realize that the supply voltage of the internal circuit of the portable power source is kept constant in a wide input voltage range, so as to meet the requirement of the wide voltage range.

According to the utility model provides a portable power source, include: a DC source circuit comprising at least one battery pack for providing a first DC voltage when discharging or receiving the first DC voltage when charging; the interface circuit comprises a connection port suitable for being connected with an external power supply or an external device; a DC-DC conversion circuit including a first port and a second port, the first port being connected to the DC source circuit, the second port being connected to the interface circuit, the DC-DC conversion circuit being configured to convert a first DC voltage provided by the first port into a second DC voltage when the battery pack is discharged, or convert the second DC voltage provided by the second port into the first DC voltage when the battery pack is charged; the control circuit is respectively connected with the interface circuit and the DC-DC conversion circuit and is used for controlling the working states of the interface circuit and the DC-DC conversion circuit; the selection circuit is respectively connected with a first port and a second port of the DC-DC conversion circuit and respectively receives the first direct-current voltage and the second direct-current voltage; and the power supply circuit is connected with the selection circuit, converts the first direct-current voltage or the second direct-current voltage into power supply voltage and supplies power to the control circuit, and the selection circuit selects to supply the first direct-current voltage or the second direct-current voltage to the power supply circuit.

Optionally, the selection circuit provides the first dc voltage to the power supply circuit when the battery pack is discharged, or provides the second dc voltage to the power supply circuit when the battery pack is charged.

Optionally, the selection circuit includes: the anode of the first diode is connected with the first port, and the cathode of the first diode is connected with the power supply circuit; and the anode of the second diode is connected with the second port, and the cathode of the second diode is connected with the power supply circuit.

Optionally, the DC-DC converter is respectively connected to the DC source circuit, the interface circuit and the control circuit, and provides a bidirectional energy transfer path between the DC source circuit and the interface circuit under the control of the control circuit.

Optionally, the dc source circuit operates in a charging state when the voltage of the at least one battery pack is less than the lowest voltage of normal operation or the connection port is connected to an external power source, and operates in a discharging state when the voltage of the at least one battery pack is greater than the lowest voltage of normal operation or the connection port is connected to an external device.

Optionally, the control circuit determines whether an external device or an external power supply is currently connected according to the voltage change of the connection port, and generates a first control signal according to a determination result, where the first control signal is used to control a working state of the interface circuit.

Optionally, the control circuit is configured to generate a second control signal according to the states of the first port and the second port and a signal provided by the interface circuit, where the second control signal is used to control the operating state of the DC-DC conversion circuit.

Optionally, the power supply circuit is a voltage reduction circuit, and when the first dc voltage or the second dc voltage is greater than the working voltage of the control circuit, the first dc voltage or the second dc voltage is reduced to obtain the power supply voltage.

Optionally, the power supply circuit is a buck-boost circuit, and when the first dc voltage or the second dc voltage is greater than the working voltage of the control circuit, the first dc voltage or the second dc voltage is stepped down to obtain the power supply voltage; and under the condition that the first direct-current voltage and the second direct-current voltage are smaller than the working voltage of the control circuit, boosting the first direct-current voltage or the second direct-current voltage to obtain the power supply voltage.

Optionally, the power supply circuit includes: the voltage conversion module comprises a switching tube and is used for converting the received first direct-current voltage or the second direct-current voltage into the power supply voltage; and the driving module is connected with the voltage conversion module and is used for controlling the on and off of a switch tube in the voltage conversion module.

Optionally, the topology of the voltage conversion module is selected from: a Buck topology, a Boost topology, or a Buck-Boost topology.

Optionally, the voltage conversion module includes: the first end of the first switch tube is connected with the selection circuit, the control end of the first switch tube is connected with the driving module, and the driving module controls the first switch tube to be alternately switched on and off; the first end of the inductor is connected with the second end of the first switching tube; the cathode of the first freewheeling diode is connected with the intermediate node of the first switching tube and the inductor, and the anode of the first freewheeling diode is grounded; and the first end of the output capacitor is connected with the second end of the inductor, the second end of the output capacitor is connected with the anode of the first freewheeling diode, and the first end of the output capacitor is suitable for providing the power supply voltage.

Optionally, the voltage conversion module includes: the first end of the first switch tube is connected with the selection circuit, and the control end of the first switch tube is connected with the driving module; the first end of the inductor is connected with the second end of the first switching tube; a first end of the second switch tube is connected with a second end of the inductor, a control end of the second switch tube is connected with the driving module, and a second end of the second switch tube is grounded; the cathode of the first freewheeling diode is connected with the middle node of the first switching tube and the inductor, and the anode of the first freewheeling diode is connected with the second end of the second switching tube; a second freewheeling diode having an anode connected to the second end of the inductor; the first end of the output capacitor is connected with the cathode of the second freewheeling diode, the second end of the output capacitor is grounded, the first end of the output capacitor is used for providing the power supply voltage, the driving module controls the first switching tube to be always on and controls the second switching tube to be alternately turned on and off under the condition that the first direct current voltage and the second direct current voltage are smaller than the working voltage of the control circuit, and the driving module controls the first switching tube to be alternately turned on and off and controls the second switching tube to be always turned off under the condition that the first direct current voltage or the second direct current voltage is larger than the working voltage of the control circuit.

Optionally, the DC-DC conversion circuit is selected from a half-bridge circuit or a full-bridge circuit.

The embodiment of the utility model provides a portable power source has following beneficial effect.

The selection circuit provides the first direct-current voltage to the power supply circuit when the battery pack is discharged, or provides the second direct-current voltage to the power supply circuit when the battery pack is charged, the power supply circuit converts the received first direct-current voltage or the received second direct-current voltage into the power supply voltage to supply power to the control circuit, the situation that the power supply loss of the control circuit is large or the power supply voltage is insufficient when the first direct-current voltage and the second direct-current voltage change within a wide voltage range can be avoided, the situation that the power supply voltage of an internal circuit of the mobile power supply is basically constant within the wide input voltage range can be achieved, and the requirement of the wide voltage range is met.

In a further embodiment, the power supply circuit may be implemented by a voltage reduction circuit or a voltage boost/reduction circuit, and when the first dc voltage or the second dc voltage is greater than the operating voltage of the control circuit in the mobile power supply, the power supply circuit performs voltage reduction processing; when the first direct-current voltage and the second direct-current voltage are smaller than the working voltage of the control circuit in the mobile power supply, the power supply circuit performs boosting processing, so that the power supply voltage of the control circuit in the mobile power supply can be kept stable all the time, the efficiency of the mobile power supply is improved, the working voltage range of the mobile power supply is widened, and the mobile power supply is simple in structure, convenient to control, low in loss and high in efficiency.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 shows a schematic structural diagram of a mobile power supply according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a DC-DC conversion circuit in the mobile power supply according to the first embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a mobile power supply according to a second embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a mobile power supply according to a third embodiment of the present invention.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.

Numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in the following description in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.

It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through an electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Fig. 1 shows a schematic structural diagram of a mobile power supply according to a first embodiment of the present invention. As shown in fig. 1, the portable power source 10 includes a direct-current source circuit 11, an interface circuit 12, a DC-DC conversion circuit 13, a control circuit 14, a selection circuit 15, and a power supply circuit 16.

The dc source circuit 11 may include a plurality of battery packs, and the battery packs are adapted to provide the first dc voltage V1 when discharging or receive the first dc voltage V1 when charging. When the voltage of the battery packs is lower than the lowest voltage of normal operation or the interface circuit 12 is connected with an external power supply, the direct current source circuit 11 works in a charging state; when the voltage of the battery packs is higher than the lowest voltage for normal operation or the interface circuit 12 is connected to an external device, the dc power supply circuit 11 operates in a discharge state.

It should be noted that the battery pack in the dc source circuit 11 may include a structure in which a plurality of batteries are connected in series or a plurality of capacitors are connected in parallel, and the embodiment of the present invention does not limit this.

The interface circuit 12 includes a connection port adapted to connect with an external power source or an external device, the insertion or removal of which represents a voltage change at the connection port of the interface circuit 12.

It should be noted that the interface circuit 12 in the above embodiment may be integrated on a chip, and the function of accessing and removing the external device is realized by using one chip, which is not limited in the embodiment of the present invention.

The DC-DC converter circuit 13 comprises a first port connected to the DC source circuit 11 and a second port connected to the interface circuit 12 and adapted to provide a path for bidirectional transfer of energy between the DC source circuit 11 and the interface circuit 12. The DC-DC conversion circuit 13 is configured to convert the first DC voltage V1 provided by the first port into a second DC voltage V2 when the battery pack is discharged, or convert the second DC voltage V2 provided by the second port into a first DC voltage V1 when the battery pack is charged. For example, the DC-DC conversion circuit 13 may be selected from a full bridge circuit or a half bridge circuit.

The control circuit 14 is connected to the interface circuit 12 and is adapted to provide a first control signal to the interface circuit 12, wherein the first control signal responds to the connection of an external device or an external power source by controlling the on and off of the switch tube in the interface circuit 12, so as to close the energy input loop or close the energy output loop. Further, the control circuit 14 determines whether there is an access of an external device currently by detecting a voltage change of the connection port of the interface circuit 12, and generates the first control signal according to a determination result. For example, when an external device is connected, it is equivalent to connect a resistor and a capacitor in parallel at the connection port of the interface circuit 12, and the resistor and the capacitor pull down the voltage at the connection port; conversely, when the external device is removed, the voltage at the connection port will rise.

The control circuit 14 is further connected to the DC-DC conversion circuit 13 and adapted to provide a second control signal to the DC-DC conversion circuit 13 to control the on/off of the plurality of switching tubes in the DC-DC conversion circuit 13, so as to implement bidirectional energy transmission and voltage step-up/step-down conversion. Further, the control circuit 14 generates the second control signal according to the states of the first port and the second port of the DC-DC conversion circuit 13 and the signal of the interface circuit 12.

The selection circuit 15 is connected to the first port and the second port of the DC-DC conversion circuit 13, and is adapted to provide a transmission path of the first direct voltage V1 and the second direct voltage V2 to the power supply circuit 16. Further, the selection circuit 15 includes a diode D11 and a diode D12. The diode D11 has an anode connected to the first port of the DC-DC converter circuit and a cathode connected to the power supply circuit 16. The diode D12 has an anode connected to the second port of the DC-DC converter circuit 13 and a cathode connected to the power supply circuit 16. The diode D11 and the diode D12 are used to isolate the first direct voltage V1 at the first port of the DC-DC converter circuit 13 and the second direct voltage V2 at the second port of the DC-DC converter circuit 13, respectively.

For example, the selection circuit 15 provides the first dc voltage V1 to the power supply circuit 16 when the battery pack starts to discharge, or provides the second dc voltage V2 to the power supply circuit 16 when the battery pack starts to charge. During the discharging or charging process of the battery pack, the selection circuit 15 provides the larger voltage value of the first direct current voltage V1 and the second direct current voltage V2 to the power supply circuit 16.

The power supply circuit 16 is connected to the selection circuit 15, and the power supply circuit 16 is adapted to convert the first dc voltage V1 or the second dc voltage V2 into the power supply voltage V3 and provide the power supply voltage V3 to the control circuit 14 to supply power to the control circuit 14.

Further, the power supply circuit 16 is selected from a step-up circuit, a step-down circuit, or a step-up/step-down circuit. For example, when the first dc voltage V1 or the second dc voltage V2 is greater than the operating voltage of the control circuit 14, the power supply circuit 16 steps down the first dc voltage V1 or the second dc voltage V2 to obtain the power supply voltage V3; when the first dc voltage V1 and the second dc voltage V2 are smaller than the operating voltage of the control circuit 14, the supply voltage 16 boosts the first dc voltage V1 or the second dc voltage V2 to obtain the supply voltage V3.

The mobile power supply of the embodiment converts the first direct current voltage V1 into the power supply voltage V3 through the power supply circuit 16 when the battery pack is discharged, or converts the second direct current voltage V2 into the power supply voltage V3 when the battery pack is charged, and then supplies the power supply voltage V3 to the control circuit 14, so that the situation that the power supply loss of the control circuit 14 is large or the power supply voltage is insufficient when the first direct current voltage V1 and the second direct current voltage V2 change in a wide voltage range can be avoided, the efficiency of the mobile power supply can be improved, and the working voltage range of the mobile power supply can be widened. Fig. 2 is a schematic diagram showing a configuration of a DC-DC conversion circuit in the mobile power supply according to the first embodiment of the present invention. As shown in fig. 2, the DC-DC converter circuit 13 includes a first port 131 and a second port 132, switching tubes Q31 to Q34 constituting a full bridge circuit, and an inductor L1.

The first port 131 is used for connecting with the dc power supply circuit 11, and the second port 132 is used for connecting with the interface circuit 12. The switch tube Q31, the inductor L1 and the switch tube Q33 are sequentially connected in series between the first port 131 and the second port 132, the first end of the switch tube Q32 is connected with the middle node of the switch tube Q31 and the inductor L1, the second end of the switch tube Q32 is grounded, the first end of the switch tube Q34 is connected with the middle node of the inductor L1 and the switch tube Q33, and the second end of the switch tube Q34 is grounded. In the working process, the switching tube Q31 and the switching tube Q32 are alternately switched on and off, and the switching tube Q33 and the switching tube Q34 are alternately switched on and off, so that the bidirectional transmission of energy and the buck-boost conversion of voltage are realized.

Fig. 3 shows a schematic structural diagram of a mobile power supply according to a second embodiment of the present invention. As shown in fig. 3, the portable power source 20 includes a direct current source circuit 21, an interface circuit 22, a DC-DC conversion circuit 23, a control circuit 24, a selection circuit 25, and a power supply circuit 26.

In the present embodiment, the power supply circuit 26 includes a driving module 261 and a voltage conversion module 262. The driving module 261 is configured to control the switching tubes in the voltage conversion module 262 to be turned on and off, so that the voltage conversion module 262 converts the received first dc voltage V1 or the second dc voltage V2 into the supply voltage V3. The voltage conversion module 262 is selected from a voltage reduction circuit, and further, the topological structure of the voltage conversion module 262 is selected from a Buck topology, and the Buck topology includes a switching tube Q1, a freewheeling diode D21, an inductor L2, and an output capacitor C1. A first terminal of the switching tube Q1 is connected to the selection circuit 25, and a second terminal of the switching tube Q1 is connected to a first terminal of the inductor L2. The second terminal of the inductor L2 is connected to the first terminal of the output capacitor C1, and the second terminal of the output capacitor C1 is grounded. The cathode of the freewheeling diode D21 is connected to the intermediate node between the switching transistor Q1 and the inductor L2, and the anode of the freewheeling diode D21 is grounded. The first end of the output capacitor C1 is used for providing a supply voltage V3. The driving module 261 is connected to the control terminal of the switching tube Q1, and is configured to control the switching tube Q1 to turn on and off, so as to stabilize the supply voltage V3.

Further, when the driving module 261 controls the switching tube Q1 to be turned on, the current flows from the dc source circuit 21 or the interface circuit 22, flows through the switching tube Q1 and the inductor L2, and finally flows to the control circuit 24, thereby forming a complete current loop; when the driving module 261 controls the switching tube Q1 to turn off, since the current in the inductor L2 cannot change abruptly, the current continues to flow through the control circuit 24 from the inductor L2, and finally flows back to the inductor L2 through the freewheeling diode D21 to complete freewheeling, thereby forming another complete current loop.

Except for this, the DC source circuit 21, the interface circuit 22, the DC-DC converter circuit 23, the control circuit 24, and the selection circuit 25 in the portable power source 20 of the second embodiment are completely the same as the structures of the DC source circuit 11, the interface circuit 12, the DC-DC converter circuit 13, the control circuit 14, and the selection circuit 15 in the portable power source 10 of the first embodiment, and thus, description thereof is omitted.

Fig. 4 shows a schematic structural diagram of a mobile power supply according to a third embodiment of the present invention. As shown in fig. 4, the mobile power supply 30 includes a direct current source circuit 31, an interface circuit 32, a DC-DC conversion circuit 33, a control circuit 34, a selection circuit 35, and a power supply circuit 36. The power supply circuit 36 includes a driving module 361 and a voltage conversion module 362. The driving module 361 is used for controlling the on and off of the switching tube in the voltage conversion module 362, so that the voltage conversion module 362 converts the received first direct-current voltage V1 or the second direct-current voltage V2 into the supply voltage V3.

The mobile power supply 30 of the third embodiment differs from the mobile power supply 20 of the second embodiment in that: the power supply circuit 36 is selected from a Boost/Buck circuit, and further, the topology structure of the voltage conversion module 362 is selected from a Buck-Boost topology, and includes a switching tube Q1, an inductor L2, a freewheeling diode D21, an output capacitor C1, a switching tube Q2, and a freewheeling diode D22.

A first terminal of the switching tube Q1 is connected to the selection circuit 35, and a second terminal of the switching tube Q1 is connected to a first terminal of the inductor L2. A second terminal of the inductor L2 is connected to a first terminal of the switching transistor Q2, and a second terminal of the switching transistor Q2 is connected to an anode of the freewheeling diode D21. The cathode of the freewheeling diode D21 is connected to the intermediate node between the switching transistor Q1 and the inductor L2, and the anode of the freewheeling diode D21 is grounded. The anode of the freewheeling diode D22 is connected to the second terminal of the inductor L2, the cathode of the freewheeling diode D22 is connected to the first terminal of the output capacitor C1, and the second terminal of the output capacitor C1 is grounded. The first end of the output capacitor C1 is used for providing a supply voltage V3. The driving module 361 is connected with the control ends of the switching tube Q1 and the switching tube Q2, and the driving module 361 is used for controlling the on and off of the switching tube Q1 and the switching tube Q2, so that the stability of the power supply voltage V3 is realized.

Further, when the first dc voltage V1 or the second dc voltage V2 is greater than the operating voltage required by the control circuit 34, the driving module 361 controls the switching tube Q1 to be turned on and off, and controls the switching tube Q2 to be turned off all the time, so as to implement the voltage reduction processing on the first dc voltage V1 or the second dc voltage V2, and generate the stable supply voltage V3.

Furthermore, when the driving module 361 controls the switching transistor Q1 to be turned on and controls the switching transistor Q2 to be turned off, the current flows from the dc source circuit 31 or the interface circuit 32, flows through the switching transistor Q1, the inductor L2 and the freewheeling diode D22, and finally flows to the control circuit 34, thereby forming a complete current loop. When the driving module 361 controls the switching tube Q1 to turn off, since the current in the inductor L2 cannot change abruptly, the current continues to flow from the inductor L2 through the freewheeling diode D22 and the control circuit 34, and finally flows back to the inductor L2 through the freewheeling diode D21 to complete freewheeling, thereby forming another complete current loop.

Further, under the condition that the first dc voltage V1 and the second dc voltage V2 are lower than the operating voltage required by the control circuit 34, the driving module 361 controls the switching tube Q1 to be always turned on, and controls the switching tube Q2 to be turned on and off, so as to boost the first dc voltage V1 or the second dc voltage V2, and generate the stable supply voltage V3.

Furthermore, when the driving module 361 controls the switching tube Q2 to be turned on, the current flows from the dc source circuit 31 or the interface circuit 32, flows through the switching tube Q1, the inductor L2, and the switching tube Q2, and finally flows back to the negative electrode of the dc source circuit 31 or the interface circuit 32, so as to form a complete current loop. When the driving module 361 controls the switching tube Q2 to turn off, because the current in the inductor L2 cannot change abruptly, a part of the current continues to flow from the inductor L2 through the freewheeling diode D22 into the control circuit 34, and another part of the current flows from the dc source circuit 31 or the interface circuit 32, flows through the switching tube Q1, the inductor L2 and the freewheeling diode D22, and finally flows to the control circuit 34, thereby forming another complete current loop. Except for this, the DC source circuit 31, the interface circuit 32, the DC-DC converter circuit 33, the control circuit 34, and the selection circuit 35 in the mobile power supply 30 of the third embodiment are completely the same as the DC source circuit 21, the interface circuit 22, the DC-DC converter circuit 23, the control circuit 24, and the selection circuit 25 in the mobile power supply 20 of the second embodiment, and therefore, no further description is given here.

It should be noted that, in other embodiments, the topology of the voltage conversion module of the power supply circuit may also be selected from a Boost topology, which is not limited by the present invention.

To sum up, the utility model discloses a first direct current voltage or the second direct current voltage conversion that portable power source's supply circuit will receive are supply voltage, to control circuit power supply can avoid when first direct current voltage and second direct current voltage change at wide voltage range, the emergence of the big on the left side or the not enough condition of supply voltage of control circuit's that causes power supply loss can be realized in wide input voltage range, and portable power source inner circuit's supply voltage all keeps invariable basically, satisfies wide voltage range's requirement.

In a further embodiment, the power supply circuit may be implemented by a voltage reduction circuit or a voltage boost/reduction circuit, and when the first dc voltage or the second dc voltage is greater than the operating voltage of the control circuit in the mobile power supply, the power supply circuit performs voltage reduction processing; when the first direct-current voltage and the second direct-current voltage are smaller than the working voltage of the control circuit in the mobile power supply, the power supply circuit performs boosting processing, so that the power supply voltage of the control circuit in the mobile power supply can be kept stable all the time, the efficiency of the mobile power supply is improved, and the working voltage range of the mobile power supply is widened.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A mobile power supply, comprising:

a DC source circuit comprising at least one battery pack providing a first DC voltage when discharging or receiving the first DC voltage when charging;

the interface circuit comprises a connection port suitable for being connected with an external power supply or an external device;

a DC-DC conversion circuit including a first port and a second port, the first port being connected to the DC source circuit, the second port being connected to the interface circuit, the DC-DC conversion circuit converting a first DC voltage provided from the first port into a second DC voltage when the battery pack is discharged, or converting a second DC voltage provided from the second port into a first DC voltage when the battery pack is charged;

the control circuit is respectively connected with the interface circuit and the DC-DC conversion circuit and controls the working states of the interface circuit and the DC-DC conversion circuit;

the selection circuit is respectively connected with a first port and a second port of the DC-DC conversion circuit and respectively receives the first direct-current voltage and the second direct-current voltage; and

and the power supply circuit is connected with the selection circuit, converts the first direct-current voltage or the second direct-current voltage into power supply voltage and supplies power to the control circuit, and the selection circuit selects to supply the first direct-current voltage or the second direct-current voltage to the power supply circuit.

2. The mobile power supply of claim 1, wherein the selection circuit provides the first dc voltage to the power supply circuit when the battery pack is discharged or provides the second dc voltage to the power supply circuit when the battery pack is charged.

3. The mobile power supply of claim 1, wherein the selection circuit comprises:

the anode of the first diode is connected with the first port, and the cathode of the first diode is connected with the power supply circuit; and

and the anode of the second diode is connected with the second port, and the cathode of the second diode is connected with the power supply circuit.

4. The mobile power supply according to claim 1, wherein the DC-DC converter is connected to the DC source circuit, the interface circuit and the control circuit, respectively, and under the control of the control circuit, a bidirectional energy transfer path is provided between the DC source circuit and the interface circuit.

5. The mobile power supply according to claim 1, wherein the dc source circuit operates in a charging state if the voltage of the at least one battery pack is less than a minimum voltage for normal operation or the connection port is connected to an external power supply, and operates in a discharging state if the voltage of the at least one battery pack is greater than the minimum voltage for normal operation or the connection port is connected to an external device.

6. The mobile power supply according to claim 1, wherein the control circuit determines whether an external device or an external power supply is currently connected according to a voltage variation of the connection port, and generates a first control signal according to a determination result, wherein the first control signal controls an operating state of the interface circuit.

7. The mobile power supply of claim 1, wherein the control circuit generates a second control signal according to the states of the first port and the second port and a signal provided by the interface circuit, and the second control signal is used for controlling the operating state of the DC-DC conversion circuit.

8. The mobile power supply of claim 1, wherein the power supply circuit is a voltage reduction circuit,

and when the first direct current voltage or the second direct current voltage is larger than the working voltage of the control circuit, the first direct current voltage or the second direct current voltage is subjected to voltage reduction to obtain the power supply voltage.

9. The mobile power supply of claim 1, wherein the power supply circuit is a buck-boost circuit,

when the first direct-current voltage or the second direct-current voltage is larger than the working voltage of the control circuit, the first direct-current voltage or the second direct-current voltage is subjected to voltage reduction to obtain the power supply voltage;

and under the condition that the first direct-current voltage and the second direct-current voltage are smaller than the working voltage of the control circuit, boosting the first direct-current voltage or the second direct-current voltage to obtain the power supply voltage.

10. The mobile power supply of claim 1, wherein the power supply circuit comprises:

the voltage conversion module comprises a switching tube and is used for converting the received first direct-current voltage or the second direct-current voltage into the power supply voltage; and

and the driving module is connected with the voltage conversion module and is used for controlling the on and off of a switching tube in the voltage conversion module.

11. The mobile power supply of claim 10, wherein the topology of the voltage conversion module is selected from the group consisting of: a Buck topology, a Boost topology, or a Buck-Boost topology.

12. The mobile power supply of claim 10, wherein the voltage conversion module comprises:

the first end of the first switch tube is connected with the selection circuit, the control end of the first switch tube is connected with the driving module, and the driving module controls the first switch tube to be alternately switched on and off;

the first end of the inductor is connected with the second end of the first switching tube;

the cathode of the first freewheeling diode is connected with the intermediate node of the first switching tube and the inductor, and the anode of the first freewheeling diode is grounded;

an output capacitor, a first end of the output capacitor is connected with a second end of the inductor, a second end of the output capacitor is connected with an anode of the first freewheeling diode,

wherein the first terminal of the output capacitor is adapted to provide the supply voltage.

13. The mobile power supply of claim 10, wherein the voltage conversion module comprises:

the first end of the first switch tube is connected with the selection circuit, and the control end of the first switch tube is connected with the driving module;

a first end of the second switch tube is connected with a second end of the inductor, a control end of the second switch tube is connected with the driving module, and a second end of the second switch tube is grounded;

the cathode of the first freewheeling diode is connected with the middle node of the first switching tube and the inductor, and the anode of the first freewheeling diode is connected with the second end of the second switching tube;

a second freewheeling diode having an anode connected to the second end of the inductor;

an output capacitor, a first end of the output capacitor is connected with a cathode of the second freewheeling diode, a second end of the output capacitor is grounded,

wherein a first terminal of the output capacitor is used for providing the supply voltage,

under the condition that the first direct current voltage and the second direct current voltage are smaller than the working voltage of the control circuit, the driving module controls the first switch tube to be always conducted and controls the second switch tube to be alternately conducted and disconnected,

and under the condition that the first direct-current voltage or the second direct-current voltage is greater than the working voltage of the control circuit, the driving module controls the first switching tube to be alternately switched on and off and controls the second switching tube to be always switched off.

14. The mobile power supply of claim 1, wherein the DC-DC conversion circuit is selected from a half-bridge circuit or a full-bridge circuit.