CN220190653U - Battery powered device and power supply circuit thereof - Google Patents
Battery powered device and power supply circuit thereof Download PDFInfo
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- CN220190653U CN220190653U CN202320614837.XU CN202320614837U CN220190653U CN 220190653 U CN220190653 U CN 220190653U CN 202320614837 U CN202320614837 U CN 202320614837U CN 220190653 U CN220190653 U CN 220190653U
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- 238000005070 sampling Methods 0.000 claims abstract description 91
- 238000007600 charging Methods 0.000 claims abstract description 66
- 230000005669 field effect Effects 0.000 claims description 48
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010278 pulse charging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the utility model provides battery electric equipment and a power circuit thereof, comprising: the system comprises a controller, a charging circuit, a first power supply circuit, a second power supply circuit, a system voltage sampling circuit, a battery voltage sampling circuit and an external power supply sampling circuit, wherein the charging circuit, the first power supply circuit and the second power supply circuit are connected with the main controller; the charging circuit comprises a charging output end connected with the battery of the equipment, a first controlled end connected with the main controller and a power input end connected with an external power supply; the first power supply circuit comprises a first power supply output end connected with a power end of the equipment system, a second controlled end connected with the main controller and a power supply input end connected with an external power supply; the second power supply circuit comprises a second power supply output end connected with a power end of the equipment system, a third controlled end connected with an external power supply and a battery input end connected with a battery of the equipment; the main controller respectively samples the voltages of the equipment system power supply end, the equipment battery and the external power supply through each path of sampling circuit.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to battery electric equipment and a power supply circuit thereof.
Background
Currently, various types of electric equipment with rechargeable batteries are increasingly abundant in the market. The power supply circuit of the electric device is generally divided into a charge control chip for managing charge and discharge of the rechargeable battery and a power supply control chip for supplying electric energy required by the operation of the electric device by performing power conversion on an external power supply when the external power supply is connected. Under the condition that an external power supply is not connected, the charging control chip controls the rechargeable battery to release electric energy to provide electric energy required by work for electric equipment; in the scene of connecting an external power supply, the power supply control chip is used for providing electric energy required by work for electric equipment by utilizing the external power supply preferentially, and meanwhile, under the condition that the electric quantity of the rechargeable battery is insufficient, the charging control chip is used for charging the rechargeable battery to prepare for the next battery power supply, so that the use of various scenes can be met, and the whole working time of the electric equipment can be prolonged as much as possible.
However, in the above-mentioned known power circuit scheme, two paths of cooperative work of the charging control chip and the power control chip are required, which is not beneficial to simplifying the circuit structure, often occupies more internal space of the electric equipment, and has higher failure rate in the circuit operation.
Disclosure of Invention
In order to solve the existing technical problems, the embodiment of the utility model provides a power circuit which has a simplified structure, small occupied space and higher stability and battery electric equipment with the power circuit.
In order to achieve the above object, the technical solution of the embodiment of the present utility model is as follows:
the power supply circuit of the battery electric equipment comprises a main controller, a charging circuit, a first power supply circuit, a second power supply circuit, a system voltage sampling circuit, a battery voltage sampling circuit and an external power supply sampling circuit, wherein the charging circuit, the first power supply circuit and the second power supply circuit are connected with the main controller; the charging circuit comprises a charging output end connected with the battery of the equipment, a first controlled end connected with the main controller and a power input end connected with an external power supply; the first power supply circuit comprises a first power supply output end connected with a power end of the equipment system, a second controlled end connected with the main controller and a power supply input end connected with the external power supply; the second power supply circuit comprises a second power supply output end connected with the power end of the equipment system, a third controlled end connected with the external power supply and a battery input end connected with the equipment battery; the system voltage sampling circuit is connected with the equipment system power end, and the main controller detects the voltage of the equipment system power end through the system voltage sampling circuit; the battery voltage sampling circuit is connected with the equipment battery, and the main controller detects the voltage of the equipment battery through the battery sampling circuit; the external power supply sampling circuit is connected with the external power supply, and the main controller detects the voltage of the external power supply through the external power supply sampling circuit.
The device comprises a main controller, a device battery, a charging output end, an external power supply, a power supply end and a power supply end, wherein the device battery is connected with the charging output end; the first power supply branch is provided with a first unidirectional diode, and the second power supply branch is provided with a second unidirectional diode.
Wherein the second power supply branch comprises the second unidirectional diode, a current limiting resistor and a zener diode which are connected in series between the external power supply and the ground terminal; and a connection node between the current limiting resistor and the voltage stabilizing diode is connected with the power supply of the main controller.
The charging circuit comprises a first triode and a first field effect tube which are sequentially connected; the base electrode of the first triode is used as the first controlled end, the collector electrode of the first triode is connected with the grid electrode of the first field effect tube, and the emitter electrode of the first triode is connected with the grounding end; the source electrode of the first field effect transistor is connected with the external power supply, and the drain electrode of the first field effect transistor is connected with a device battery.
The charging circuit comprises a first low-pass filter circuit connected with the charging output end; the first low-pass filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series between the drain electrode of the first field effect transistor and the grounding end, and a node connected between the first filter resistor and the first filter capacitor is used as the charging output end.
The first power supply circuit comprises a second triode and a second field effect transistor which are sequentially connected; the base electrode of the second triode is used as the second controlled end, the collector electrode is connected with the grid electrode of the second field effect tube through a first voltage dividing resistor and the source electrode of the second field effect tube through a second voltage dividing resistor respectively, the drain electrode of the second field effect tube is used as the first power supply output end, and a junction connected between the second voltage dividing resistor and the source electrode is used as the power supply input end.
The first power supply circuit further comprises a second low-pass filter circuit connected with the first power supply output end; the second low-pass filter circuit comprises a second filter resistor and a second filter capacitor which are connected in series between the drain electrode of the second field effect transistor and the grounding end, and a node connected between the second filter resistor and the second filter capacitor is used as the first power supply output end.
The second power supply circuit comprises a third field effect transistor; and the grid electrode of the third field effect transistor is used as the third controlled end, the drain electrode of the third field effect transistor is used as the battery input end and is used for being connected with the positive electrode of the equipment battery, the junction connected between the drain electrode and the positive electrode of the equipment battery is connected with the charging output end, and the source electrode of the third field effect transistor is used as the second power supply output end.
The system voltage sampling circuit comprises a first sampling resistor and a second sampling resistor which are connected in series between a power end and a ground end of the equipment system, and a node connected between the first sampling resistor and the second sampling resistor is connected with the main controller; the battery voltage sampling circuit comprises a third sampling resistor and a fourth sampling resistor which are connected in series between the positive electrode of the battery of the equipment and the grounding end, and a node connected between the third sampling resistor and the fourth sampling resistor is connected with the main controller; the external power supply sampling circuit comprises a fifth sampling resistor and a sixth sampling resistor which are connected in series between the external power supply and the grounding end, and a node connected between the fifth sampling resistor and the sixth sampling resistor is connected with the main controller.
A battery powered device comprises a rechargeable battery, a system working circuit and a power supply circuit of the battery powered device according to any embodiment of the utility model; wherein the rechargeable battery is the device battery; the equipment system power end is a power end of the system working circuit; the external power supply is one of the following: the device comprises a mains supply connected with a USB interface, other electronic equipment connected with the USB interface and a charging pile.
The power supply circuit of the battery electric equipment is respectively connected with the charging circuit, the first power supply circuit and the second power supply circuit through the main controller, and the main controller respectively collects real-time voltages of the equipment system power supply end, the equipment battery and the external power supply through the system voltage sampling circuit, the battery voltage sampling circuit and the external power supply sampling circuit; on the other hand, the main controller utilizes the real-time voltages respectively collected by the multipath sampling circuits to realize the multipath control of charging and power supply in the electric equipment, thereby being convenient for realizing the upgrading and optimizing of the power supply strategy in the electric equipment and effectively reducing the failure rate of the work of the power supply circuit.
Drawings
FIG. 1 is a schematic diagram of a power circuit of a battery powered device in an embodiment;
fig. 2 is a circuit configuration diagram of a power circuit of a battery powered device in an embodiment.
Detailed Description
The technical scheme of the utility model is further elaborated below by referring to the drawings in the specification and the specific embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the implementations of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 and fig. 2, a power supply circuit of a battery powered device according to an embodiment of the present utility model includes a main controller 10, a charging circuit 12 connected to the main controller 10, a first power supply circuit 13 and a second power supply circuit 14, and a system voltage sampling circuit 15, a battery voltage sampling circuit 16 and an external power supply sampling circuit 17 connected to the main controller 10; the charging circuit 12 includes a charging output 121 connected to the device battery 18, a first controlled terminal A6 connected to the main controller 10, and a power input vbus_usb connected to the external power source 11; the first power supply circuit 13 includes a first power supply output terminal connected to the system power supply terminal sys_pwr of the device, a second controlled terminal B7 connected to the main controller 10, and a power supply input terminal 131 connected to the external power supply 11; the second power supply circuit 14 includes a second power supply output terminal connected to the device system power supply terminal sys_pwr, a third controlled terminal 141 connected to the external power supply 11, and a battery input terminal connected to the device battery 18; the system voltage sampling circuit 15 is connected with the device system power supply terminal sys_pwr, and the main controller 10 detects the voltage of the device system power supply terminal sys_pwr through the system voltage sampling circuit 15; the battery voltage sampling circuit 16 is connected with the device battery 18, and the main controller 10 detects the voltage of the device battery 18 through the battery sampling circuit; the external power supply sampling circuit 17 is connected to the external power supply 11, and the main controller 10 detects the voltage of the external power supply 11 through the external power supply sampling circuit 17.
The battery electric equipment refers to electronic equipment, electric equipment and the like with rechargeable batteries. The power supply circuit may be integrally provided inside the battery powered device, and the surface of the battery powered device may be formed with an external power interface for connection to the external power source 11, which may be of a known standard interface type such as USB, typc-C, etc. The power supply input vbus_usb of the charging circuit 12 and the power supply input 131 of the first power supply circuit 13 are electrically connected to the external power supply interface. The device battery 18 may be a rechargeable lithium battery pack mounted in a battery compartment inside the battery powered device, and the charging output 121 of the charging circuit 12 is connected to the positive pole of the device battery 18.
The battery electric equipment is internally provided with a system working circuit, and the equipment system power supply end SYS_PWR refers to a power supply input end of the system working circuit. The device system power supply end sys_pwr is connected to the first power supply output end, and may be connected to the external power supply 11 through the first power supply circuit 13, where when the battery electric device is connected to the external power supply 11 through the external power supply interface, the system working circuit of the battery electric device may obtain the electric energy required by the operation through the external power supply 11 and the first power supply circuit 13. The device system power supply terminal sys_pwr is connected to the second power supply output terminal, and may be connected to the device battery 18 through the second power supply circuit 14, where the system operating circuit of the battery consumer may obtain the electric energy required for operation through the device battery 18 and the second power supply circuit 14 when the battery consumer is not connected to the external power supply 11.
The main controller 10 comprises independent control ends respectively connected with the controlled ends of the charging circuit 12 and the first power supply circuit 13, so that the charging circuit 12 and the first power supply circuit 13 can be independently controlled, the main controller 10 also comprises a control end connected with the equipment battery 18, and the unified control of external power supply, battery power supply and battery charging of the battery electric equipment can be accurately and efficiently realized through the single main controller 10 according to the real-time sampling result of the multi-path sampling circuit.
According to the power supply circuit of the battery electric equipment, the main controller 10 is respectively connected with the charging circuit 12, the first power supply circuit 13 and the second power supply circuit 14, and the main controller 10 respectively collects real-time voltages of the equipment system power supply end SYS_PWR, the equipment battery 18 and the external power supply 11 through the system voltage sampling circuit 15, the battery voltage sampling circuit 16 and the external power supply sampling circuit 17, so that the main controller 10 can identify whether the electric equipment is currently connected with the external power supply 11, the residual electric quantity of the equipment battery 18 and other states, and uniformly control the work of the charging circuit 12, the first power supply circuit 13 and the second power supply circuit 14, on one hand, the power supply control of the electric equipment by the external power supply 11 and the charge/discharge control of the rechargeable battery can be realized through the single main controller 10, the whole circuit structure is simpler, and the internal space of the electric equipment required by the power supply circuit can be effectively reduced; on the other hand, the main controller 10 utilizes the real-time voltages respectively collected by the multipath sampling circuits to realize the multipath control of charging and power supply in the electric equipment, thereby being convenient for realizing the upgrading and optimizing of the power supply strategy in the electric equipment and effectively reducing the failure rate of the work of the power supply circuit.
Wherein, a node connected between the device battery 18 and the charging output terminal 121 is connected with a power supply terminal of the main controller 10 to form a first power supply branch, and the external power supply 11 is connected with the power supply terminal VDD of the main controller 10 to form a second power supply branch; the first power supply branch is provided with a first unidirectional diode D3, and the second power supply branch is provided with a second unidirectional diode D1. The first unidirectional diode D3 is used for limiting the current direction in the first power supply branch between the device battery 18 and the main controller 10, the second unidirectional diode D1 is used for limiting the current direction in the second power supply branch between the external power supply 11 and the main controller 10, the first power supply branch and the second power supply branch are commonly connected through the power supply terminal VDD of the main controller 10 and are mutually communicated, and the arrangement of the unidirectional diodes in the respective branches can prevent current reverse strings between the external power supply 11 and the device battery 18. Wherein the second power supply branch comprises the second unidirectional diode D1, a current limiting resistor R15 and a zener diode D4 connected in series between the external power source 11 and ground; the junction point connected between the current limiting resistor R15 and the zener diode D4 is connected to the power supply terminal VDD of the main controller 10. When the external power supply 11 supplies power to the battery powered device, the external power supply 11 supplies working voltage to the main controller 10 through the second power supply branch, and the current limiting resistor R15 and the zener diode D4 have voltage limiting function, so that the main controller 10 can be prevented from being damaged by overvoltage.
In some embodiments, the charging circuit 12 includes a first transistor Q1 and a first fet Q4 connected in sequence; the base electrode of the first triode Q1 is used as the first controlled end A6, the collector electrode is connected with the grid electrode of the first field effect tube Q4, and the emitter electrode is connected with the grounding end; the source of the first fet Q4 is connected to the external power source 11, and the drain is connected to the device battery 18. The control end of the main controller 10 connected to the first controlled end A6 can output a high level signal/a low level signal to the base of the first triode Q1 according to whether the charging circuit 12 is currently turned on to charge the device battery 18, so as to control the first triode Q1 and the first fet Q4 to be turned on/off, and the external power supply 11 can charge/turn off the device battery 18 through the charging circuit 12. Protection resistors are respectively connected in series between the control end of the main controller 10 and the base electrode of the first triode Q1, and between the base electrode and the emitter electrode of the first triode Q1, so that the first triode Q1 can be ensured to be smoothly conducted under the condition that the control end of the main controller 10 outputs a high-level signal. Protection resistors are respectively connected in series between the collector of the first triode Q1 and the grid of the first field effect transistor Q4 and between the collector of the first triode Q1 and the source of the first field effect transistor Q4, so that under the condition that the first triode Q1 is smoothly conducted, the grid of the first field effect transistor Q4 obtains a reversed biased grid voltage difference to ensure that the first field effect transistor Q4 can be smoothly conducted.
Wherein the charging circuit 12 further comprises a first low-pass filter circuit connected to the charging output 121; the first low-pass filter circuit includes a first filter resistor R20 and a first filter capacitor C24 connected in series between the drain of the first field effect transistor Q4 and the ground, and a junction point connected between the first filter resistor R20 and the first filter capacitor C24 is used as the charging output terminal 121. The charging output terminal 121 may be formed as a contact electrically connected to the positive electrode of the device battery 18, and the first low-pass filter circuit is disposed between the drain electrode of the first fet Q4 and the charging output terminal 121, so that the charging voltage output from the external power supply 11 to the device battery 18 through the first fet Q4 is more stable during operation of the charging circuit 12. The charging circuit 12 adopts a design that the first triode Q1 and the first field effect transistor Q4 are connected in series, the main controller 10 can output a pulse control signal to the first controlled end A6 through the control end, so as to output a pulse charging signal through the first field effect transistor Q4, and the charging voltage can be adjusted according to practical application requirements.
In some embodiments, the first power supply circuit 13 includes a second triode Q2 and a second field effect transistor Q5 connected in sequence; the base electrode of the second triode Q2 is used as the second controlled end B7, the collector electrode is connected with the gate electrode of the second field effect tube Q5 through a first voltage dividing resistor R17 and connected with the source electrode of the second field effect tube Q5 through a second voltage dividing resistor R2, the drain electrode of the second field effect tube Q5 is used as the first power supply output end, and the junction point connected between the second voltage dividing resistor R2 and the source electrode is used as the power supply input end 131. Wherein the power supply input 131 may be formed as a contact electrically connected to an external power interface connected to the external power source 11, and a high voltage may be obtained at the power supply input 131 when the battery powered device is connected to the external power source 11. Protection resistors are respectively connected in series between the control end of the main controller 10 and the base electrode of the second triode Q2 and before the base electrode and the emitter electrode of the second triode Q2, so that the second triode Q2 can be ensured to be smoothly conducted under the condition that the control end of the main controller 10 outputs a high-level signal. The first voltage dividing resistor R17 and the second voltage dividing resistor R2 in the grid electrode and the source electrode of the second field effect transistor Q5 are arranged, so that under the condition that the second triode Q2 is smoothly conducted, the grid electrode of the second field effect transistor Q5 can obtain a reverse bias grid voltage difference with a proper size to ensure that the second field effect transistor Q5 can be smoothly conducted.
Wherein the first power supply circuit 13 further comprises a second low-pass filter circuit connected to the first power supply output terminal; the second low-pass filter circuit comprises a second filter resistor R21 and a second filter capacitor C25 which are connected in series between the drain electrode of the second field effect transistor Q5 and the ground end, and a junction point connected between the second filter resistor R21 and the second filter capacitor C25 is used as the first power supply output end. The first power supply output end is electrically connected with the power supply end of the system working circuit of the battery electric equipment, the second low-pass filter circuit is arranged between the drain electrode of the second field effect transistor Q5 and the first power supply output end, when the battery electric equipment is connected with the external power supply 11, the external power supply 11 can supply power to the system working circuit through the first power supply circuit 13, and the external power supply 11 outputs more stable power supply voltage to the equipment battery 18 after passing through the second field effect transistor Q5. The first power supply circuit 13 adopts a design that the second triode Q2 and the second field effect transistor Q5 are connected in series and conducted, the main controller 10 can output a pulse control signal to the second controlled end B7 through the control end, so as to output a pulse power supply signal through the second field effect transistor Q5, and a system working voltage with a proper size can be obtained according to practical application requirements.
In some embodiments, the second power supply circuit 14 includes a third fet Q3; the gate electrode of the third fet Q3 is used as the third controlled terminal 141, the drain electrode is used as the battery input terminal, and is used for being connected with the positive electrode of the device battery 18, the node connected between the drain electrode and the positive electrode of the device battery 18 is connected with the charging output terminal, and the source electrode is used as the second power supply output terminal. Wherein the third controlled end 141 may be formed as one contact electrically connected to an external power interface. The third controlled terminal 141 is connected to the ground terminal through a pull-down resistor R5 and to a second power supply branch connected between the external power source 11 and the power source terminal VDD of the main controller 10. An indicator lamp D2 and a current limiting resistor R3 for indicating the charging state are connected in series between the positive electrode of the equipment battery 18 and the control end A5 of the main controller, and the remaining electric quantity of the equipment battery 18 can be indicated by the indicator lamp or whether the equipment battery 18 is in the charging state or not is indicated by the indicator lamp. The drain electrode of the third fet Q3 is connected to the charging output terminal 121 of the charging circuit 12, and when the battery powered device is connected to the external power source 11, if the remaining power of the device battery 18 is lower than a certain set value, the external power source 11 can charge the device battery 18 through the charging output terminal 121; and the external power supply 11 can supply power to the system operating circuit; when the battery powered device is not connected to the external power supply 11, the gate voltage of the third fet Q3 is pulled down by the pull-down resistor R5 to be turned on, and the device battery 18 can provide the operating voltage to the main controller 10 through the first power supply branch, and provide the operating voltage to the system operating circuit through the third fet Q3.
In some embodiments, the system voltage sampling circuit 15 includes a first sampling resistor R6 and a second sampling resistor R7 connected in series between the device system power supply terminal sys_pwr and a ground terminal, and a node connected between the first sampling resistor R6 and the second sampling resistor R7 is connected to the main controller 10; the battery voltage sampling circuit 16 comprises a third sampling resistor R8 and a fourth sampling resistor R9 which are connected in series between the positive electrode of the device battery 18 and the ground, and a node connected between the third sampling resistor R8 and the fourth sampling resistor R9 is connected with the main controller 10; the external power supply sampling circuit 17 includes a fifth sampling resistor R10 and a sixth sampling resistor R11 connected in series between the external power supply 11 and a ground terminal, and a node connected between the fifth sampling resistor R10 and the sixth sampling resistor R11 is connected to the main controller 10. The main controller 10 includes three input terminals respectively connected to the battery voltage sampling circuit 16, the external power supply sampling circuit 17 and the system voltage sampling circuit 15, and can independently and real-timely detect the power supply circuit state of the current battery powered device in working state, and includes: whether the external power supply 11 is connected at present, the residual capacity condition of the battery 18 of the device at present, the state that the battery 18 of the device supplies power to the working circuit of the system or the state that the external power supply 11 supplies power to the working circuit of the system at present, whether the external power supply 11 charges the battery 18 of the device at present, etc., are convenient for the main controller 10 to select the target circuit which needs to be started at present in the charging circuit 12, the first power supply circuit 13 and the second power supply circuit 14 according to the sampling results of a plurality of sampling circuits, and output control signals through the control end connected with the controlled end of the target circuit, thereby realizing the accurate and unified control of the power supply of the external power supply 11 to the electric equipment and the charge/discharge of the rechargeable battery through the main controller 10.
In another aspect of the embodiments of the present utility model, a battery powered device is provided, including a rechargeable battery, a system operating circuit, and a power circuit according to any one of the embodiments of the present utility model; wherein the rechargeable battery is a device battery in a power supply circuit; the device system power supply end SYS_PWR in the power supply circuit refers to a power supply input end of the system working circuit; the external power source 11 may be selected from one of the following: the device comprises a mains supply connected with a USB interface, other electronic equipment connected with the USB interface and a charging pile. The rechargeable battery can be relatively fixedly arranged in the battery electric equipment, and can also be relatively detachably arranged in a battery groove of the battery electric equipment; the rechargeable battery may be a lithium battery pack, or a battery pack. The external surface of the battery powered device is provided with an external power interface, and the type of the external power interface can be selected from common standard interface types.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (10)
1. The power supply circuit of the battery electric equipment is characterized by comprising a main controller, a charging circuit, a first power supply circuit, a second power supply circuit, a system voltage sampling circuit, a battery voltage sampling circuit and an external power supply sampling circuit, wherein the charging circuit, the first power supply circuit and the second power supply circuit are connected with the main controller;
the charging circuit comprises a charging output end connected with the battery of the equipment, a first controlled end connected with the main controller and a power input end connected with an external power supply;
the first power supply circuit comprises a first power supply output end connected with a power end of the equipment system, a second controlled end connected with the main controller and a power supply input end connected with the external power supply;
the second power supply circuit comprises a second power supply output end connected with the power end of the equipment system, a third controlled end connected with the external power supply and a battery input end connected with the equipment battery;
the system voltage sampling circuit is connected with the equipment system power end, and the main controller detects the voltage of the equipment system power end through the system voltage sampling circuit; the battery voltage sampling circuit is connected with the equipment battery, and the main controller detects the voltage of the equipment battery through the battery sampling circuit; the external power supply sampling circuit is connected with the external power supply, and the main controller detects the voltage of the external power supply through the external power supply sampling circuit.
2. The power circuit of claim 1, wherein a junction point connected between the device battery and the charging output is connected to a power supply terminal of the main controller to form a first power supply branch, and wherein the external power supply is connected to the power supply terminal of the main controller to form a second power supply branch;
the first power supply branch is provided with a first unidirectional diode, and the second power supply branch is provided with a second unidirectional diode.
3. The power circuit of claim 2, wherein the second power supply branch comprises the second unidirectional diode, a current limiting resistor, and a zener diode connected in series between the external power source and ground; and a node connected between the current limiting resistor and the voltage stabilizing diode is connected with the power supply end of the main controller.
4. The power supply circuit of claim 1, wherein the charging circuit comprises a first transistor and a first field effect transistor connected in sequence;
the base electrode of the first triode is used as the first controlled end, the collector electrode of the first triode is connected with the grid electrode of the first field effect tube, and the emitter electrode of the first triode is connected with the grounding end;
the source electrode of the first field effect transistor is connected with the external power supply, and the drain electrode of the first field effect transistor is connected with a device battery.
5. The power circuit of claim 4, wherein the charging circuit further comprises a first low pass filter circuit connected to the charging output;
the first low-pass filter circuit comprises a first filter resistor and a first filter capacitor which are connected in series between the drain electrode of the first field effect transistor and the grounding end, and a node connected between the first filter resistor and the first filter capacitor is used as the charging output end.
6. The power supply circuit of claim 1, wherein the first power supply circuit comprises a second transistor and a second field effect transistor connected in sequence;
the base electrode of the second triode is used as the second controlled end, the collector electrode is connected with the grid electrode of the second field effect tube through a first voltage dividing resistor and the source electrode of the second field effect tube through a second voltage dividing resistor respectively, the drain electrode of the second field effect tube is used as the first power supply output end, and a junction connected between the second voltage dividing resistor and the source electrode is used as the power supply input end.
7. The power supply circuit of claim 6, wherein the first power supply circuit further comprises a second low pass filter circuit connected to the first power supply output;
the second low-pass filter circuit comprises a second filter resistor and a second filter capacitor which are connected in series between the drain electrode of the second field effect transistor and the grounding end, and a node connected between the second filter resistor and the second filter capacitor is used as the first power supply output end.
8. The power circuit of claim 1, wherein the second power circuit comprises a third field effect transistor; and the grid electrode of the third field effect transistor is used as the third controlled end, the drain electrode of the third field effect transistor is used as the battery input end and is used for being connected with the positive electrode of the equipment battery, the junction connected between the drain electrode and the positive electrode of the equipment battery is connected with the charging output end, and the source electrode of the third field effect transistor is used as the second power supply output end.
9. The power circuit of claim 1, wherein the system voltage sampling circuit comprises a first sampling resistor and a second sampling resistor connected in series between the device system power terminal and a ground terminal, a junction connected between the first sampling resistor and the second sampling resistor being connected to the master controller;
the battery voltage sampling circuit comprises a third sampling resistor and a fourth sampling resistor which are connected in series between the positive electrode of the battery of the equipment and the grounding end, and a node connected between the third sampling resistor and the fourth sampling resistor is connected with the main controller;
the external power supply sampling circuit comprises a fifth sampling resistor and a sixth sampling resistor which are connected in series between the external power supply and the grounding end, and a node connected between the fifth sampling resistor and the sixth sampling resistor is connected with the main controller.
10. A battery powered device comprising a rechargeable battery, a system operating circuit and a power supply circuit as claimed in any one of claims 1 to 9;
wherein the rechargeable battery is the device battery; the equipment system power end is a power end of the system working circuit; the external power supply is selected from one of the following: the device comprises a mains supply connected with a USB interface, other electronic equipment connected with the USB interface and a charging pile.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320614837.XU CN220190653U (en) | 2023-03-20 | 2023-03-20 | Battery powered device and power supply circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320614837.XU CN220190653U (en) | 2023-03-20 | 2023-03-20 | Battery powered device and power supply circuit thereof |
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| CN220190653U true CN220190653U (en) | 2023-12-15 |
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| CN202320614837.XU Active CN220190653U (en) | 2023-03-20 | 2023-03-20 | Battery powered device and power supply circuit thereof |
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