CN110098661B - Power supply switching circuit and household appliance - Google Patents

Power supply switching circuit and household appliance Download PDF

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Publication number
CN110098661B
CN110098661B CN201910535516.9A CN201910535516A CN110098661B CN 110098661 B CN110098661 B CN 110098661B CN 201910535516 A CN201910535516 A CN 201910535516A CN 110098661 B CN110098661 B CN 110098661B
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Prior art keywords
resistor
adapter
battery
circuit
field effect
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CN110098661A (en
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孙阳
黄卫员
梁智聪
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Tonly Electronics Holdings Ltd
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Tonly Electronics Holdings Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power supply switching circuit and a household appliance, wherein the power supply switching circuit comprises a battery output circuit, a battery switch circuit, an adapter detection circuit and an adapter output circuit; the battery output circuit is used for supplying power to the battery switch circuit when receiving an external control signal; the adapter detection circuit is used for detecting whether an adapter is connected or not, generating a first detection signal when the adapter is connected, and generating a second detection signal when the adapter is not connected; the battery switch circuit is used for being turned off when receiving a first detection signal so that the battery stops supplying power to the load; conducting when receiving the second detection signal so that the battery supplies power to the load; the adapter output circuit is used for supplying power to the load when the adapter is accessed, so that the use frequency of the battery is reduced, and the purpose of prolonging the service life of the battery is achieved.

Description

Power supply switching circuit and household appliance
Technical Field
The present invention relates to the field of battery charging technologies, and in particular, to a power switching circuit and a household appliance.
Background
Among current consumer electronic products, portable electronic products with batteries are increasingly popular with consumers, and when consumers use such battery products, the consumers often have the following two usage scenarios: the utility model provides a for battery mode, namely the product is when the start uses, only the battery is supplied with power for the product, the battery is only discharge state, another is the adapter mode, namely the product is when the start uses, insert the adapter and use, the battery can be in the state of charging while putting this moment, in above-mentioned scene, the battery can normally supply power for the system of rear end when charging, this can lead to the battery not to be fully charged all the time, if the product works under this scene for a long time, the battery can seriously influence battery life when charging while discharging, reduce the live time of product, seriously influence consumer's user experience.
Disclosure of Invention
The invention mainly aims to provide a power supply switching circuit and a household appliance, and aims to solve the technical problem that the service life of a battery is influenced by the fact that the existing battery is discharged when being charged.
In order to achieve the above object, the present invention provides a power supply switching circuit including a battery output circuit, a battery switch circuit, an adapter detection circuit, and an adapter output circuit; wherein the method comprises the steps of
The battery output circuit is used for supplying power to the battery switch circuit when receiving an external control signal;
the adapter detection circuit is used for detecting whether an adapter is connected or not, generating a first detection signal when the adapter is connected, and generating a second detection signal when the adapter is not connected;
the battery switch circuit is used for being turned off when the first detection signal is received, so that the battery stops supplying power to a load, wherein the load is a post-stage circuit; conducting when the second detection signal is received, so that a battery supplies power to the load;
the adapter output circuit is used for supplying power to the load when the adapter is accessed.
Preferably, the battery output circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode and a first field effect transistor;
the first end of the first resistor is connected with the battery, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the collector electrode of the first triode, the base electrode of the first triode is connected with the first end of the third resistor, the second end of the third resistor is grounded, the first end of the fourth resistor is connected with a power supply, the second end of the fourth resistor is connected with the base electrode of the first triode, and the emitter electrode of the first triode is grounded;
the source electrode of the first field effect tube is connected with the battery, the grid electrode of the first field effect tube is connected with the first end of the second resistor, and the drain electrode of the first field effect tube is connected with the load.
Preferably, the battery output circuit further comprises a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the battery, and the second end of the first capacitor is connected with the first end of the second resistor;
the first end of the second capacitor is connected with the power supply, and the second end of the second capacitor is grounded.
Preferably, the battery switch circuit includes a second field effect transistor, a drain electrode of the second field effect transistor is connected with an output end of the battery output circuit, a source electrode of the second field effect transistor is connected with the adapter detection circuit, and a gate electrode of the second field effect transistor is also connected with the adapter detection circuit.
Preferably, the battery switch circuit further comprises a first anti-reverse diode;
the anode of the first anti-reflection diode is connected with the drain electrode of the second field effect tube, and the cathode of the first anti-reflection diode is connected with the adapter detection circuit.
Preferably, the adapter detection circuit comprises a voltage division circuit, a driving circuit and an adapter switch circuit;
the input end of the voltage dividing circuit is connected with the adapter, the first output end of the voltage dividing circuit is connected with the battery switch circuit, the second output end of the voltage dividing circuit is connected with the control end of the driving circuit, the input end of the adapter switch circuit is connected with the output end of the battery switch circuit, the output end of the adapter switch circuit is connected with the load, and the driving end of the driving circuit is connected with the control end of the adapter switch circuit.
Preferably, the voltage dividing circuit comprises a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor;
the first end of the fifth resistor is connected with the adapter, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is grounded, the first end of the seventh resistor is connected with the adapter, the second end of the seventh resistor is connected with the first end of the eighth resistor, and the second end of the eighth resistor is grounded.
Preferably, the driving circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second triode and a third triode;
the first end of the ninth resistor is connected with the battery switch circuit, the second end of the ninth resistor is connected with the collector electrode of the second triode, the base electrode of the second triode is connected with the second end of the seventh resistor, and the emitter electrode of the second triode is grounded;
the first end of the tenth resistor is connected with the collector electrode of the second triode, the second end of the tenth resistor is connected with the base electrode of the third triode, and the emitter electrode of the third triode is grounded;
the first end of the eleventh resistor is connected with the battery switch circuit, and the second end of the eleventh resistor is connected with the first end of the twelfth resistor;
the first end of the twelfth resistor is connected with the control end of the adapter switch circuit, and the second end of the twelfth resistor is connected with the collector electrode of the third triode;
the adapter switching circuit comprises a third field effect transistor;
the grid electrode of the third field effect tube is connected with the first end of the twelfth resistor, the source electrode of the third field effect tube is connected with the first end of the eleventh resistor, and the drain electrode of the third field effect tube is connected with a load.
Preferably, the adapter output circuit includes an adapter port and a second diode;
the anode of the second diode is connected with the battery switch circuit, and the cathode of the second diode is connected with the adapter port.
In addition, to achieve the above object, the present invention also proposes a household appliance comprising the power switching circuit as described above.
The power supply switching circuit comprises a battery output circuit, a battery switch circuit, an adapter detection circuit and an adapter output circuit; the battery output circuit is used for supplying power to the battery switch circuit when receiving an external control signal; the adapter detection circuit is used for detecting whether an adapter is connected or not, generating a first detection signal when the adapter is connected, and generating a second detection signal when the adapter is not connected; the battery switch circuit is used for being turned off when receiving a first detection signal so that the battery stops supplying power to the load; conducting when receiving the second detection signal so that the battery supplies power to the load; the adapter output circuit is used for supplying power to the load when the adapter is connected, supplying power to the load through the adapter output circuit when the adapter is connected, and supplying power to the load through the battery output circuit when the adapter is not connected, so that the power supply to the load through the battery output circuit when the adapter is connected is avoided, the service frequency of a battery is reduced, and the purpose of prolonging the service life of the battery is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of a power switching circuit of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a power switching circuit according to the present invention;
FIG. 3 is a schematic diagram of a first exemplary embodiment of a power switching circuit according to the present invention;
FIG. 4 is a schematic diagram of a second exemplary embodiment of a power switching circuit according to the present invention;
fig. 5 is a schematic diagram of a third simulation embodiment of the power switching circuit of the present invention.
Reference numerals illustrate:
reference numerals Name of the name Reference numerals Name of the name
100 Power supply switching circuit 200 Household appliance
10 Battery output circuit R1-R12 First to twelfth resistors
20 Battery switch circuit C1 and C2 First and second capacitors
30 Adapter detection circuit Q1 First triode
301 Voltage dividing circuit Q4 and Q5 Second triode and third triode
302 Driving circuit D1 and D2 First anti-reflection diode and second diode
303 Adapter switching circuit Q2 First field effect transistor
40 Adapter output circuit Q3 Second field effect transistor
60 Load(s) Q6 Third field effect transistor
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention provides an embodiment of a power switching circuit 100.
Referring to fig. 1, fig. 1 is a schematic diagram of a first embodiment of a power switching circuit 100. In an embodiment of the present invention, the power switching circuit 100 includes: a battery output circuit 10, a battery switch circuit 20, an adapter detection circuit 30, and an adapter output circuit 40; wherein, the battery output circuit 10 is used for supplying power to the battery switch circuit 20 when receiving an external control signal;
the adapter detection circuit 30 is configured to detect whether an adapter is connected, generate a first detection signal when the adapter is connected, and generate a second detection signal when the adapter is not connected;
the battery switch circuit 20 is configured to be turned off when the first detection signal is received, so that the battery stops supplying power to the load 60, where the load is a post-stage circuit; conducting upon receipt of the second detection signal to cause a battery to power the load 60;
the adapter output circuit 40 is configured to supply power to the load 60 when the adapter is accessed.
According to the technical scheme provided by the embodiment, when the adapter is connected, the load 60 is powered through the adapter output circuit 40, and when the adapter is not connected, the load 60 is powered through the battery output circuit 10, so that the situation that the load 60 is still powered through the battery output circuit 10 when the adapter is connected is avoided, the use frequency of a battery is reduced, and the purpose of prolonging the service life of the battery is achieved.
Referring to fig. 2, fig. 2 is a schematic diagram of a second embodiment of a power switching circuit 100', which uses 2 transistors, 1 MOS transistor, and 6 resistors to perform power management, so as to effectively increase the service life of the battery,
the battery output circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1, and a first field effect transistor Q2;
the first end of the first resistor R1 is connected with the battery, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with the collector electrode of the first triode Q1, the base electrode of the first triode Q1 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is grounded, the first end of the fourth resistor R4 is connected with a power supply, the second end of the fourth resistor R4 is connected with the base electrode of the first triode Q1, and the emitter electrode of the first triode Q1 is grounded;
the source electrode of the first field effect transistor Q2 is connected to the battery, the gate electrode of the first field effect transistor Q2 is connected to the first end of the second resistor R2, and the drain electrode of the first field effect transistor Q2 is connected to the load 60.
Further, the battery output circuit 10 further includes a first capacitor C1 and a second capacitor C2;
a first end of the first capacitor C1 is connected with the battery, and a second end of the first capacitor C1 is connected with a first end of the second resistor R2;
the first end of the second capacitor C2 is connected with the power supply, and the second end of the second capacitor C2 is grounded.
Further, the battery switch circuit 20 includes a second fet Q3, a drain electrode of the second fet Q3 is connected to an output end of the battery output circuit 10, a source electrode of the second fet Q3 is connected to the adapter detection circuit 30, and a gate electrode of the second fet Q3 is also connected to the adapter detection circuit 30.
Further, the battery switch circuit 20 further includes a first anti-reverse diode D1;
the anode of the first anti-reflection diode D1 is connected to the drain of the second field effect transistor Q3, and the cathode of the first anti-reflection diode D1 is connected to the adapter detection circuit 30.
In this embodiment, the power supply has two paths for supplying power to the battery and the adapter, three field effect transistors are arranged on the working path of the battery, and a schottky diode is arranged on the working path of the adapter, and the specific working principle is as follows: when in a battery mode, the micro-electric control first field effect transistor Q2 is conducted; the adapter is not powered to enable the second field effect transistor Q3 and the third field effect transistor Q6 to be in a conducting state, so that the battery supplies power to the back-end system, and the diode D1 prevents current of the battery from flowing backwards into the adapter; when the adapter supplies power, the adapter supplies power to the back-end system through the diode D1 when the adapter voltage is larger than the battery voltage; the third field effect transistor Q6 is controlled by two triodes, when the adapter is inserted, the third field effect transistor Q6 is cut off, the system is only powered by the adapter, and the battery is only charged at the moment, so that the charging efficiency is improved, and the battery is protected.
Further, the adapter detection circuit 30 includes a voltage division circuit 301, a driving circuit 302, and an adapter switching circuit 303;
the input end of the voltage dividing circuit 301 is connected with an adapter, the first output end of the voltage dividing circuit 301 is connected with the battery switch circuit 20, the second output end of the voltage dividing circuit 301 is connected with the control end of the driving circuit 302, the input end of the adapter switch circuit 303 is connected with the output end of the battery switch circuit 20, the output end of the adapter switch circuit 303 is connected with the load 60, and the driving end of the driving circuit 302 is connected with the control end of the adapter switch circuit 303.
Further, the voltage dividing circuit 301 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
the first end of the fifth resistor R5 is connected with the adapter, the second end of the fifth resistor R5 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is grounded, the first end of the seventh resistor R7 is connected with the adapter, the second end of the seventh resistor R7 is connected with the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is grounded.
Since the adapter is not inserted, the base of Q4 is low, and Vbe of Q4 is <0.7V, then Q4 is turned off; the battery voltage pulls the base voltage of Q5 up to the battery voltage through voltage pull-up circuit 302, and Q5 is turned on when Vbe of Q5 is >0.7V, at which time the battery powers the back-end load 60.
When the adapter is inserted, the voltage of the adapter is lower than the voltage of the battery, the voltage of the adapter is divided by R5 and R6 to enable the VGS voltage of Q3 to be lower than the conducting voltage, and then Q3 is cut off; the voltage of the adapter passes through the partial voltage of R7 and R8, and when the Vbe of Q4 is more than 0.7V, the Q4 is in a conducting state; since Q4 is on, Q5 is off, and at this time, the gate voltage and the source voltage of Q6 are equal, and Q6 is off.
Further, the driving circuit 302 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second transistor Q4, and a third transistor Q5;
a first end of the ninth resistor R9 is connected with the battery switch circuit 20, a second end of the ninth resistor R9 is connected with a collector of the second triode Q4, a base of the second triode Q4 is connected with a second end of the seventh resistor R7, and an emitter of the second triode Q4 is grounded;
a first end of the tenth resistor R10 is connected with the collector of the second triode Q4, a second end of the tenth resistor R10 is connected with the base of the third triode Q5, and the emitter of the third triode Q5 is grounded;
a first end of the eleventh resistor R11 is connected to the battery switch circuit 20, and a second end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12;
a first end of the twelfth resistor R12 is connected to the control end of the adapter switch circuit 303, and a second end of the twelfth resistor R12 is connected to the collector of the third triode Q5;
when the adapter is inserted, the voltage of the adapter is lower than the voltage of the battery, the voltage of the adapter is divided by R5 and R6 to enable the VGS voltage of Q3 to be lower than the conducting voltage, and then Q3 is cut off; the voltage of the adapter passes through the partial voltage of R7 and R8, and when the Vbe of Q4 is more than 0.7V, the Q4 is in a conducting state; since Q4 is on, Q5 is off, and at this time, the gate voltage and the source voltage of Q6 are equal, and Q6 is off.
The adapter switch circuit 303 includes a third fet Q6;
the gate of the third fet Q6 is connected to the first end of the twelfth resistor R12, the source of the third fet Q6 is connected to the first end of the eleventh resistor R11, and the drain of the third fet Q6 is connected to the load 60.
Further, the adapter output circuit 40 includes an adapter port and a second diode D2;
the anode of the second diode D2 is connected to the battery switch circuit 20, and the cathode of the second diode D2 is connected to the adapter port.
When the adapter is pulled out instantly, Q3 can be opened, but because the opening time of Q3 is slow, the current of the battery flows to the rear end through D1 at this moment, the body diode of Q3 can be prevented from being broken down instantly, and phenomena of machine power failure, sound interruption, restarting and the like are also prevented from occurring instantly when the adapter is pulled out.
In this embodiment, the problem of power path management of a dual-power supply system can be solved with low cost, such devices as an MOS tube and a diode are used for controlling a power supply path, so that the problem of premature aging of a battery caused by cyclic charging is prevented, the problem that the battery can be fully charged when an adapter is plugged into a machine to work is effectively solved, and when the adapter supplies power, the adapter is suddenly pulled out, so that the machine is not powered off, is not restarted, and is not broken. The user experience is improved, the service cycle of the battery can be prolonged, no additional power management chip is used, and certain cost advantages are achieved.
By using Multisim for simulation, the state of the circuit was simulated in different cases. S1 is an adapter switch, S2 is a battery switch, S3 simulates an interface of a microprocessor, RL is a rear end load 60, and R14 is a control loop for preventing reverse leakage current generated by D2 from affecting.
In experiment one, as shown in fig. 3, when the adapter is not inserted, that is, S2 and S3 are closed, and S1 is opened, the output probe 1 of the circuit is 7.16V, the voltage has a voltage drop of 0.24V through three MOS transistors, that is, the output is the battery voltage, the adapter is not inserted through the simulation machine, only the battery supplies power to the back-end system, the battery voltage is 7.4V, the output of the back-end system is 7.16V, at the moment, Q4 is turned off, Q6 is turned on, the PMOS transistor Q6 is turned on, and the battery supplies power to the back-end through Q6.
IN experiment two, as shown IN fig. 4, when the adapter is inserted, that is, S1, S2 and S3 are all IN a closed state, the output of the circuit is the voltage of the adapter, and the voltage drop is 4.66V for the probe 1, and 0.34V for D2, it is known that when the adapter is inserted, that is, the switch S1 is closed, the network dc_in1 voltage is the adapter voltage, Q4 is conducted through the partial voltage of R7 and R8, so Q5 is cut off, and the VGS voltage of Q6 is equal to 0, and since Q6 is PMOS, Q6 is IN an off state, and the circuit of the battery is cut off, only the adapter supplies power to the back-end system through D2. If Q6 is not present, the battery voltage is higher than the adapter voltage, and the power supply of the system is provided by the battery, the battery is still discharged while being charged, and the service life of the damaged battery can be verified.
In the experiment three, as shown in fig. 5, when in the battery mode, the S3 simulates the on-off key, when the S3 is opened, the Q2 is cut off, and then the back-end system has no voltage, so that shutdown is realized; while in the adapter mode, the power supply is not controlled at this time, so in the adapter mode, the backend system is in a constant power supply state.
The present embodiment provides a household appliance, the household appliance 200 includes the power switching circuit 100 as described above, and the specific structure of the power switching circuit 100 refers to the foregoing embodiments, and since the household appliance 200 adopts all the technical solutions of all the foregoing embodiments, at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which are not described herein in detail.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A power switching circuit, characterized in that the power switching circuit comprises a battery output circuit, a battery switch circuit, an adapter detection circuit and an adapter output circuit; wherein the method comprises the steps of
The battery output circuit is used for supplying power to the battery switch circuit when receiving an external control signal;
the adapter detection circuit is used for detecting whether an adapter is connected or not, generating a first detection signal when the adapter is connected, and generating a second detection signal when the adapter is not connected;
the battery switch circuit is used for being turned off when the first detection signal is received, so that the battery stops supplying power to a load, wherein the load is a post-stage circuit; conducting when the second detection signal is received, so that a battery supplies power to the load;
the adapter output circuit is used for supplying power to the load when the adapter is accessed;
the power supply of the power supply is provided with two paths which are respectively used for supplying power to the battery and the adapter, a first field effect tube, a second field effect tube and a third field effect tube are arranged on a battery working path, and a diode is arranged on an adapter path;
when the battery is in a mode, the micro-electric control first field effect tube is conducted, the adapter is not powered to enable the second field effect tube and the third field effect tube to be in a conducting state, the battery supplies power to the back-end system, and the diode is used for preventing current of the battery from flowing backwards into the adapter; when the adapter supplies power, the voltage of the adapter is larger than the voltage of the battery, the adapter supplies power to the back-end system through the diode, the third field effect transistor is controlled by the two triodes, when the adapter is inserted, the third field effect transistor is cut off, the system is powered by the adapter, and the battery is in a charging state.
2. The power switching circuit of claim 1 wherein the battery output circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, and a first field effect transistor;
the first end of the first resistor is connected with the battery, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the collector electrode of the first triode, the base electrode of the first triode is connected with the first end of the third resistor, the second end of the third resistor is grounded, the first end of the fourth resistor is connected with a power supply, the second end of the fourth resistor is connected with the base electrode of the first triode, and the emitter electrode of the first triode is grounded;
the source electrode of the first field effect tube is connected with the battery, the grid electrode of the first field effect tube is connected with the first end of the second resistor, and the drain electrode of the first field effect tube is connected with the load.
3. The power switching circuit of claim 2 wherein the battery output circuit further comprises a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the battery, and the second end of the first capacitor is connected with the first end of the second resistor;
the first end of the second capacitor is connected with the power supply, and the second end of the second capacitor is grounded.
4. A power switching circuit according to any one of claims 1 to 3 wherein the battery switching circuit comprises a second fet, the drain of the second fet being connected to the output of the battery output circuit, the source of the second fet being connected to the adapter detection circuit, the gate of the second fet also being connected to the adapter detection circuit.
5. The power switching circuit according to claim 4, wherein the battery switching circuit further comprises a first anti-reflection diode;
the anode of the first anti-reflection diode is connected with the drain electrode of the second field effect tube, and the cathode of the first anti-reflection diode is connected with the adapter detection circuit.
6. The power switching circuit according to claim 5, wherein the adapter detection circuit includes a voltage dividing circuit, a driving circuit, and an adapter switching circuit;
the input end of the voltage dividing circuit is connected with the adapter, the first output end of the voltage dividing circuit is connected with the battery switch circuit, the second output end of the voltage dividing circuit is connected with the control end of the driving circuit, the input end of the adapter switch circuit is connected with the output end of the battery switch circuit, the output end of the adapter switch circuit is connected with the load, and the driving end of the driving circuit is connected with the control end of the adapter switch circuit.
7. The power switching circuit according to claim 6, wherein the voltage dividing circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the first end of the fifth resistor is connected with the adapter, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is grounded, the first end of the seventh resistor is connected with the adapter, the second end of the seventh resistor is connected with the first end of the eighth resistor, and the second end of the eighth resistor is grounded.
8. The power switching circuit according to claim 7, wherein the driving circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second transistor, and a third transistor;
the first end of the ninth resistor is connected with the battery switch circuit, the second end of the ninth resistor is connected with the collector electrode of the second triode, the base electrode of the second triode is connected with the second end of the seventh resistor, and the emitter electrode of the second triode is grounded;
the first end of the tenth resistor is connected with the collector electrode of the second triode, the second end of the tenth resistor is connected with the base electrode of the third triode, and the emitter electrode of the third triode is grounded;
the first end of the eleventh resistor is connected with the battery switch circuit, and the second end of the eleventh resistor is connected with the first end of the twelfth resistor;
the first end of the twelfth resistor is connected with the control end of the adapter switch circuit, and the second end of the twelfth resistor is connected with the collector electrode of the third triode;
the adapter switching circuit comprises a third field effect transistor;
the grid electrode of the third field effect tube is connected with the first end of the twelfth resistor, the source electrode of the third field effect tube is connected with the first end of the eleventh resistor, and the drain electrode of the third field effect tube is connected with a load.
9. The power switching circuit of claim 8 wherein the adapter output circuit comprises an adapter port and a second diode;
the anode of the second diode is connected with the battery switch circuit, and the cathode of the second diode is connected with the adapter port.
10. A household appliance, characterized in that it comprises a power switching circuit according to any one of claims 1 to 9.
CN201910535516.9A 2019-06-19 2019-06-19 Power supply switching circuit and household appliance Active CN110098661B (en)

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CN111030258B (en) * 2019-12-30 2023-10-20 通力科技股份有限公司 Three-way power supply switching circuit, three-way power supply switching device and electronic equipment
CN116365693B (en) * 2023-05-16 2023-08-22 武汉海微科技有限公司 Power Input Switching Circuit

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CN103825346A (en) * 2012-11-19 2014-05-28 鸿富锦精密工业(深圳)有限公司 Power supply circuit
CN203368132U (en) * 2013-07-12 2013-12-25 Tcl通力电子(惠州)有限公司 Power switching circuit and dual-power supply device
CN105186621B (en) * 2015-09-29 2018-10-23 青岛歌尔声学科技有限公司 A kind of control circuit of adapter
CN106356988B (en) * 2016-10-09 2019-01-15 珠海市杰理科技股份有限公司 Power supply control switching circuit
CN208353060U (en) * 2018-05-24 2019-01-08 杭州利尔达展芯科技有限公司 A kind of battery and power supply adaptor supply power with double circuit switching circuit

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