CN210297317U - Discrete component dual power supply switching circuit and electronic equipment - Google Patents
Discrete component dual power supply switching circuit and electronic equipment Download PDFInfo
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- CN210297317U CN210297317U CN201921602572.1U CN201921602572U CN210297317U CN 210297317 U CN210297317 U CN 210297317U CN 201921602572 U CN201921602572 U CN 201921602572U CN 210297317 U CN210297317 U CN 210297317U
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Abstract
The utility model provides a discrete component dual supply switching circuit and electronic equipment, the circuit includes: a battery power supply circuit and an adapter power supply circuit; the battery power supply circuit is used for controlling the battery to output electric energy to supply power to the load in a battery power supply mode; the adapter power supply circuit is used for being connected with the adapter in the adapter power supply mode and outputting the electric energy of the adapter to the load and the battery; and is further configured to prevent the battery from supplying power to the load when in the adapter power mode. The power supply path between the battery and the load is disconnected by detecting the input level when the adapter is inserted, so that in the adapter power supply mode, even if the voltage of the adapter is lower than the voltage of the battery, the load is only powered by the adapter, and the battery is only charged, so that the charging efficiency is improved, the battery is prevented from being charged and discharged simultaneously, the service life of the battery is prolonged, and the service life of the electronic equipment is prolonged.
Description
Technical Field
The utility model relates to a power management field especially relates to a discrete component dual supply switching circuit and electronic equipment.
Background
Portable battery-powered electronic products typically have two modes, an adapter-powered mode (battery charging and discharging) and a battery-powered mode (battery discharging) during use. Under the adapter power supply mode, the battery can normally give the load of rear end when charging, can lead to the battery to be full of all the time, and if the product is worked under this scene for a long time, can seriously influence the battery life-span, reduces the live time of product, seriously influences consumer's user experience.
The power-on and power management circuits in the current market, if the adapter voltage is lower than the battery voltage, will result in either mode being battery powered. If the customer requests that the plug-in adapter not be shut down, the battery may enter a cyclic charge, and in addition, may cause the battery to deeply discharge and possibly become overcharged. If the IC is used for power path management, the power path switching can be effectively carried out, but the cost of the IC is too high, and the price is not advantageous.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a dual supply switching circuit of discrete component and electronic equipment, aims at solving the dual supply switching problem when adapter voltage is less than battery voltage.
In order to achieve the above object, the utility model provides a dual power switching circuit of discrete component, the circuit includes: a battery power supply circuit and an adapter power supply circuit; the input end of the battery power supply circuit is connected with the battery, the output end of the battery power supply circuit is connected with the adapter power supply circuit, the input end of the adapter power supply circuit is connected with the adapter, the output end of the adapter power supply circuit is connected with the load,
the battery power supply circuit is used for controlling the battery to output electric energy to supply power to the load in a battery power supply mode;
the adapter power supply circuit is used for being connected with the adapter in the adapter power supply mode and outputting the electric energy of the adapter to the load and the battery; and is further configured to prevent the battery from supplying power to the load when in the adapter power mode.
Preferably, the battery power supply circuit comprises a switch circuit and a first switch circuit, an input terminal of the first switch circuit is connected with the battery, an output terminal of the first switch circuit is connected with the adapter power supply circuit, a controlled terminal of the first switch circuit is connected with the switch circuit, wherein,
the switch circuit is used for controlling the connection or disconnection of the first switch circuit in a battery power supply mode.
Preferably, the first switch circuit is configured to be controlled by the switch-on/off circuit to switch on or off a power supply path between the battery and the load in a battery power supply mode; for conducting a power supply path between the adapter and the battery when in adapter power mode.
Preferably, the adapter power supply circuit includes: a second switch circuit, a third switch circuit, a first voltage divider circuit, and a second voltage divider circuit, wherein,
the input end of the second switch circuit is connected with the adapter, the output end of the second switch circuit is connected with the third switch circuit, and the other output end of the second switch circuit is connected with the battery power supply circuit;
the first end of the third switch circuit is connected with the load, and the controlled end of the third switch circuit is connected with the second voltage division circuit;
the input end of the first voltage division circuit is connected with the adapter, and the output end of the first voltage division circuit is connected with the second voltage division circuit.
Preferably, the second switching circuit is configured to conduct a power supply path between the adapter and the battery in an adapter power supply mode; the second switching circuit is also used to prevent the current of the battery from flowing back into the adapter when the adapter voltage is lower than the battery voltage.
Preferably, the second switch circuit is configured to conduct a power supply path between the battery and the load in the battery power supply mode.
Preferably, the third switch circuit is configured to conduct a power supply path between the battery and the load in a battery power supply mode; in an adapter power mode, for disconnecting a power supply path between the battery and the load.
Preferably, the first voltage dividing circuit and the second voltage dividing circuit are configured to be turned off and turned on to control the third switching circuit to be turned on in the battery power supply mode; and when the adapter is in a power supply mode, the first voltage division circuit is switched on, the second voltage division circuit is switched off, and the third switch circuit is controlled to be switched off.
Preferably, the adapter power supply circuit further comprises a schottky diode, an anode of the schottky diode is connected to the adapter, and a cathode of the schottky diode is connected to the load and the output terminal of the third switching circuit.
In addition, in order to achieve the above object, the present invention also provides an electronic device, which includes the dual power switching circuit as described above.
The utility model provides a discrete component dual supply switching circuit and electronic equipment, the circuit includes: a battery power supply circuit and an adapter power supply circuit; the battery power supply circuit is used for controlling the battery to output electric energy to supply power to the load in a battery power supply mode; the adapter power supply circuit is used for being connected with the adapter in the adapter power supply mode and outputting the electric energy of the adapter to the load and the battery; and is further configured to prevent the battery from supplying power to the load when in the adapter power mode. The power supply path between the battery and the load is disconnected by detecting the input level when the adapter is inserted, so that in the adapter power supply mode, even if the voltage of the adapter is lower than the voltage of the battery, the load is only powered by the adapter, and the battery is only charged, so that the charging efficiency is improved, the battery is prevented from being charged and discharged simultaneously, the service life of the battery is prolonged, and the service life of the electronic equipment is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a discrete component dual power switching circuit according to the present invention;
FIG. 2 is a circuit diagram of the dual power switching circuit of discrete components of the present invention;
fig. 3 is a schematic circuit diagram of a discrete component dual power switching circuit according to a first embodiment of the present invention;
fig. 4 is a circuit diagram of a discrete component dual power switching circuit according to a second embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a discrete component dual power switching circuit according to a third embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 100 | Battery power supply circuit | MCU | |
|
| 200 | Adapter power supply circuit | R1～R12 | First to |
|
| 300 | Battery with a battery cell | C1～C3 | First to |
|
| 400 | Adapter | | Load resistance | |
| 500 | Load(s) | R14 | |
|
| 101 | Switching on and switching off circuit | D1 | |
|
| 102 | First switch circuit | | Schottky diode | |
| 201 | Second switch circuit | Q2～Q3 | First to second P channel MOS transistor | |
| 202 | A first voltage dividing circuit | Q6 | Third P |
|
| 203 | Second voltage division circuit | Q1 | A |
|
| 204 | Third switch circuit | Q4～Q5 | Second to third triodes |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
The utility model provides a discrete component dual supply switching circuit.
Referring to fig. 1 and 2, the utility model provides a dual power switching circuit of discrete component, the circuit includes: battery power supply circuit 100 and adapter power supply circuit 200; the input of the battery power supply circuit 100 is connected to the battery 300, the output of the battery power supply circuit 100 is connected to the adapter power supply circuit 200, the input of the adapter power supply circuit 200 is connected to the adapter 400, the output of the adapter power supply circuit 200 is connected to the load 500, wherein,
the battery power supply circuit 100 is configured to control the battery 300 to output electric energy to supply power to the load 500 in a battery power supply mode.
The battery power supply circuit 100 comprises a switch circuit 101 and a first switch circuit 102, wherein an input terminal of the first switch circuit 102 is connected with the battery 300, an output terminal of the first switch circuit 102 is connected with the adapter power supply circuit 200, a controlled terminal of the first switch circuit 102 is connected with the switch circuit 101, wherein,
the power on/off circuit 101 is configured to control the first switching circuit to be turned on or off in the battery power supply mode.
The switching circuit 101 includes: the micro control unit MCU, a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2 and a first triode Q1; the output end of the micro control unit MCU is connected with the first end of a third resistor R3, the second end of the third resistor R3 is connected with the first end of a fourth resistor R4, the first end of the fourth resistor R4 is also connected with the first end of a second capacitor C2 and the base electrode of a first triode Q1, and the second end of the fourth resistor R4 and the second end of the second capacitor C2 are grounded; the emitter of the first transistor Q1 is also grounded, the collector of the first transistor Q1 is connected to the second terminal of the second resistor R2, and the second terminal of the second resistor R2 is connected to the controlled terminal of the first switch circuit 102.
It should be noted that, the MCU outputs a high-level control signal, so that the base of the transistor Q1 is at a high level, the transistor Q1 is turned on, and outputs the high level to the first switch circuit 102.
The first switch circuit 102 is configured to be controlled by the switch-on/off circuit 101 to switch on or off a power supply path between the battery 300 and the load 500 in a battery power supply mode; for conducting a power supply path between the battery 300 and the adapter 400 in an adapter power supply mode
The first switching circuit 102 includes: the first resistor R1, the first capacitor C1 and the first P-channel MOS transistor Q2; a first terminal of the first resistor R1 is connected to the output terminal of the battery 300 and a first terminal of the first capacitor C1, and a second terminal of the first resistor R1 is connected to a second terminal of the first capacitor C1; a first end of the first capacitor C1 is connected to the source of the first P-channel MOS transistor Q2, a gate of the first P-channel MOS transistor Q2 is connected to the second end of the first capacitor C1 and the first end of the second resistor R1, and a drain of the first P-channel MOS transistor Q2 is connected to the adapter power supply circuit 200.
When the first transistor Q1 is turned on, the gate of the first P-channel MOS transistor Q2 goes through the second resistor R2, the voltage difference between the gate and the source of the first P-channel MOS transistor Q2 reaches the turn-on voltage of the MOS transistor, and the first switch circuit 102 is turned on.
The adapter power supply circuit 200 is configured to be connected to the adapter 400 in the adapter power supply mode, and output the power of the adapter 400 to the load 500 and the battery 300; and is also used to prevent the battery 300 from supplying power to the load 500 when in the adapter power mode.
It will be readily appreciated that the adapter 400 accesses the adapter power supply circuit 200 through two interfaces.
The adapter power supply circuit 200 includes: a second switch circuit 201, a first voltage divider circuit 202, a second voltage divider circuit 203, and a third switch circuit 204; an input terminal of the second switch circuit 201 is connected to the adapter 400, an output terminal of the second switch circuit 201 is connected to an input terminal of the third switch circuit 204, and another output terminal of the second switch circuit 201 is connected to the battery power supply circuit 100; an output terminal of the third switching circuit 204 is connected to the load 500, and a controlled terminal of the third switching circuit 204 is connected to an output terminal of the second voltage dividing circuit 203; the input of the first voltage divider circuit 202 is connected to the adapter 400, and the output of the first voltage divider circuit 202 is connected to the input of the second voltage divider circuit 203.
The second switch circuit 201 is configured to conduct a power supply path between the battery 300 and the load 500 in the battery power supply mode. In the adapter power supply mode, the second switch circuit 201 is further configured to conduct a power supply path between the adapter 400 and the battery 300; the second switch circuit 201 is also used to prevent the current of the battery 300 from flowing back into the adapter 400 when the adapter voltage is lower than the battery voltage.
The second switching circuit 201 includes: a first diode D1, a second P-channel MOS transistor Q3, a third capacitor C3, a fifth resistor R5 and a sixth resistor R6, wherein,
an anode of the first diode D1 is connected to the drain of the second P-channel MOS transistor Q3 and the first end of the third capacitor C3, a second end of the third capacitor C3 is connected to the gate of the second P-channel MOS transistor Q3, and a cathode of the first diode D1 is connected to the source of the second P-channel MOS transistor Q3 and the input of the second voltage divider 203; the first end of the sixth resistor R6 is connected to the gate of the second P-channel MOS transistor Q3, the first end of the sixth resistor R6 is further connected to the second end of the fifth resistor R5, the second end of the sixth resistor R6 is grounded, and the first end of the fifth resistor R5 is connected to the adaptor 400.
It should be noted that when the adapter 400 is not inserted, the supply current provided by the battery 300 flows directly to the back-end load 500 through the first diode D1 and the second P-channel MOS transistor Q3. When the adaptor 400 is inserted, if the voltage of the adaptor 400 is lower than the voltage of the battery 300, the voltage of the adaptor 400 is divided by the fifth resistor R5 and the sixth resistor R6, so that the voltage difference between the gate and the source of the second P-channel MOS transistor Q3 is smaller than the turn-on voltage, and then the second P-channel MOS transistor Q3 is turned off.
The first voltage dividing circuit 202 and the second voltage dividing circuit 203, in the battery power supply mode, the first voltage dividing circuit 202 is turned off, the second voltage dividing circuit 203 is turned on, and the third switching circuit 204 is controlled to be turned on; in the adapter power supply mode, the first voltage divider circuit 202 is turned on, the second voltage divider circuit 203 is turned off, and the third switch circuit 204 is controlled to be turned off.
The first voltage dividing circuit 202 includes: a seventh resistor R7, an eighth resistor R8 and a second transistor Q4, wherein a first end of the seventh resistor R7 is connected to the adaptor 400, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8 and a base of the second transistor Q4, a second end of the eighth resistor R8 is connected to the emitters of the second voltage divider circuit 203 and the second transistor Q4, and a second end of the eighth resistor R8 is grounded; the collector of the second transistor Q4 is connected to the second voltage divider circuit 203.
The second voltage dividing circuit 203 includes: a ninth resistor R9, a tenth resistor R10 and a third transistor Q5, wherein a first end of the ninth resistor R9 is connected to the output end of the second switch circuit 201, a second end of the ninth resistor R9 is connected to the collector of the second transistor Q4, a second end of the ninth resistor R9 is further connected to the first end of the tenth resistor R10, a second end of the tenth resistor R10 is connected to the base of the third transistor Q5, an emitter of the third transistor Q5 is grounded, and a collector of the third transistor Q5 is connected to the third switch circuit 204.
The third switch circuit 204 is configured to conduct a power supply path between the battery 300 and the load 500 in a battery power supply mode; in the adapter power mode, for disconnecting the power supply path between the battery 300 and the load 500.
The third switching circuit 204 includes: an eleventh resistor R11, a twelfth resistor R12 and a third P-channel MOS transistor Q6, wherein a first end of the eleventh resistor R11 is connected to the output terminal of the second switch circuit 201, a first end of the eleventh resistor R11 is further connected to the source of the third P-channel MOS transistor Q6, a second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12, a second end of the twelfth resistor R12 is connected to the second voltage divider circuit 203, a first end of the twelfth resistor R12 is connected to the gate of the third P-channel MOS transistor Q6, and a drain of the third P-channel MOS transistor Q6 is connected to the load 500.
It should be noted that, in the battery power supply mode, the base of the second triode Q4 is at a low level, and the voltage difference between the base and the emitter of the second triode Q4 is smaller than the turn-on voltage, so that the second triode Q4 is turned off; the battery voltage pulls up the base voltage of the second P-channel MOS transistor Q3 to the battery voltage through the ninth resistor R9 and the tenth resistor R10, and the voltage difference between the base and the emitter of the third transistor Q5 is greater than the turn-on voltage, so that the third transistor Q5 is turned on; the battery voltage is divided by the eleventh resistor R11 and the twelfth resistor R12, so that the voltage difference between the gate and the source of the third P-channel MOS transistor Q6 reaches the turn-on voltage, that is, the third P-channel MOS transistor Q6 reaches the turn-on state, and at this time, the battery 300 supplies power to the load 500 at the rear end.
It should be noted that, in the adapter power supply mode, the voltage of the adapter 400 is divided by the seventh resistor R7 and the eighth resistor R8, and when the voltage difference between the base and the emitter of the second transistor Q4 is greater than the turn-on voltage, the second transistor Q4 is in a turn-on state; since the second transistor Q4 is turned on, the third transistor Q5 is turned off, and at this time, the gate voltage and the source voltage of the third P-channel MOS transistor Q6 are equal, the third P-channel MOS transistor Q6 is turned off, that is, the battery 300 cannot supply power to the load 500.
The adapter power supply circuit 200 further includes a schottky diode D2, an anode of the schottky diode D2 is connected to the adapter 400, and a cathode of the schottky diode D2 is connected to the load 500 and the output terminal of the third switching circuit 204. In the adapter power mode, the schottky diode D2 is used to rectify the current input by the adapter 400, reducing heat generation and power loss.
The utility model provides a discrete component dual supply switching circuit, the circuit includes: battery power supply circuit 100 and adapter power supply circuit 200; the battery power supply circuit 100 is configured to control the battery 300 to output electric energy to supply power to the load 500 in a battery power supply mode; the adapter power supply circuit 200 is configured to be connected to the adapter 400 in the adapter power supply mode, and output the power of the adapter 400 to the load 500 and the battery 300; and is also used for preventing the battery 300 from supplying power to the load 500 when the power supply of the adapter 400 is detected. By detecting the level input when adapter 400 is plugged in, the power supply path between the battery 300 and the load 400 is disconnected, so that in adapter power mode, even if the adapter voltage is lower than the battery voltage, the load 500 is only powered by the adapter 400 and the battery 300 is only charged. The problem of low-cost solution dual power supply system's power supply path management uses discrete devices such as MOS pipe, diode, controls the power supply path, prevents that the battery from leading to premature aging because of the circulation charges the problem, and the effectual problem of having solved when the adapter during operation is inserted to the machine battery and can be fully charged completely.
Based on the circuit, the utility model discloses discrete component dual power supply switching circuit first embodiment is provided; referring to fig. 3, fig. 3 is a schematic circuit diagram of a dual power switching circuit according to a first embodiment of the present invention.
In this embodiment, the mode is a battery power supply mode, the MCU outputs a high level control signal, the load is represented as a load resistor RL in this embodiment, and in a specific implementation, the load is determined by specific conditions, which is not limited in this application. The fourteenth resistor R14 prevents the schottky diode D2 from generating reverse leakage current to affect the control loop. A first end of the load resistor RL is connected to an output end of the third switch circuit 204, a second end of the load resistor RL is connected to a first end of the fourteenth resistor R14, a second end of the fourteenth resistor R14 is connected to a network voltage DC _ IN1, and the network voltage is equal to the adapter voltage.
It should be noted that, in the battery power supply mode, for example, the voltage (hereinafter, referred to as battery voltage) input by the battery 300 to the discrete component dual power supply switching circuit is 7.4V, the micro control unit MCU sends a high level control signal to control the first switch circuit 102 to be turned on, and since no adapter 400 inputs voltage to the discrete component dual power supply switching circuit, the second switch circuit 201 is turned on, and the battery current directly passes through the second switch circuit 201.
It is easily understood that, at this time, the second transistor Q4 in the first voltage division circuit 202 is turned off, the third transistor Q5 in the second voltage division circuit 203 is turned on, the third P-channel MOS transistor Q6 is turned on, and the battery current is supplied to the rear end load through the third switching circuit 204. In this embodiment, since the voltage drop is 0.24V through the three P-channel MOS transistors, the voltage obtained by the load resistor RL is 7.16V.
In this embodiment, by providing the battery power supply circuit 100 and the adapter power supply circuit 200, the battery power supply circuit 100 includes a first switch circuit 102 and a switch-on/off circuit 101, and controlling the first switch circuit 102 to be turned on by a micro control unit MCU in the switch-on/off circuit 101, and multiplexing paths such as a second switch circuit 201 and a third switch circuit 204 in the adapter power supply circuit 200, so that the battery 300 supplies power to the load 500, and the second switch circuit 201 can also be used to prevent the battery current from flowing backwards into the adapter 400. The power path management problem of the dual power supply circuit is solved with low cost.
Referring to fig. 4 and fig. 4, the circuit diagram of the second embodiment of the discrete component dual power switching circuit of the present invention is provided based on the above-mentioned embodiment shown in fig. 3.
In this embodiment, the power supply mode is set for the adapter, and the MCU outputs a high level control signal. In this embodiment, the voltage input to the discrete component dual power supply switching circuit by the adapter (hereinafter referred to simply as adapter voltage) is 5V, and the battery voltage is 7.4V, so the voltage of the adapter is smaller than the battery voltage. The second P-channel MOS transistor Q3 is turned off due to the adapter power mode.
It should be noted that, by dividing the voltage through the seventh resistor R7 and the eighth resistor R8, the second triode Q4 is turned on, so that the third triode Q5 is turned off, so that there is no voltage difference between the gate and the source of the third P-channel MOS transistor Q6, the third P-channel MOS transistor Q6 is turned off, at this time, the power supply path between the battery 300 and the load 500 is disconnected, and only the adaptor 400 supplies power to the backend system through the schottky diode D2. Since the voltage drop of the schottky diode D2 is 0.34V, the load resistor RL obtains an output voltage of 4.66V.
It is easily understood that, if the third P-channel MOS transistor Q6 is not provided, and the battery voltage is higher than the adapter voltage, the power supply of the load 500 is necessarily provided by the battery 300, and the battery 300 is still discharged while being charged, which may damage the life of the battery 300.
It should be noted that when the adapter 400 is pulled out instantaneously, the second P-channel MOS transistor Q3 is turned on, but because the on-time of the second P-channel MOS transistor Q3 is slow, the current of the battery 300 flows to the rear end through the first diode D1, which can prevent the body diode of the second P-channel MOS transistor Q3 from being broken down instantaneously, and also prevent the power failure, sound interruption, and restart of the machine at the moment that the adapter 400 is pulled out.
In the embodiment, the first switch circuit 102, the second switch circuit 201 and the third switch circuit 204 are arranged, and discrete devices such as P-channel MOS transistors, diodes and the like are adopted, so that the adapter 400 can be used for charging even when the adapter voltage is less than the battery voltage, and the battery 300 is prevented from discharging in the adapter power supply mode. Make the power supply route change into when adapter power supply mode by adapter 400 charges, the disconnection battery 300 with route between the load prevents that the battery from because the problem of cycle charge leads to premature aging, and the effectual battery that has solved when the adapter work is inserted to the machine can carry out the full charge problem completely, and when the adapter power supply, unplug the adapter suddenly and accomplish the machine and do not shut down, do not restart, do not sound.
Referring to fig. 5 and 5, a circuit diagram of a discrete component dual power switching circuit according to a second embodiment of the present invention is provided based on the above-mentioned embodiment shown in fig. 4, according to a third embodiment of the discrete component dual power switching circuit according to the present invention.
In this embodiment, the MCU does not output a high level control signal, or the MCU is disconnected from the dual power switching circuit of the discrete component.
It should be noted that, in the battery power supply mode, when the first triode Q1 is not turned on, the first P-channel MOS transistor Q2 is turned off, the power supply path between the battery 300 and the load 500 is disconnected, and the battery 300 cannot supply power to the back-end circuit, so that the load 500 does not receive electric energy, thereby implementing shutdown.
In the adapter power supply mode, the power supply terminal is the adapter 400 and is not affected by the battery 300, and therefore, the adapter power supply mode is a normal power supply state.
In this embodiment, the power on/off circuit 101 is provided, and the power on/off circuit 101 includes the MCU, so that the power on/off function of the discrete component dual power switching circuit in the battery power supply mode is realized. The user experience is improved, the service cycle of the battery can be prolonged, no extra power management IC is used, and certain cost advantage is achieved.
The utility model discloses still provide an electronic equipment, because this electronic equipment has adopted the whole technical scheme of above-mentioned all embodiments, consequently have all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, no longer give unnecessary details here.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A discrete component dual power switching circuit, the circuit comprising: a battery power supply circuit and an adapter power supply circuit; the input end of the battery power supply circuit is connected with the battery, the output end of the battery power supply circuit is connected with the adapter power supply circuit, the input end of the adapter power supply circuit is connected with the adapter, the output end of the adapter power supply circuit is connected with the load,
the battery power supply circuit is used for controlling the battery to output electric energy to supply power to the load in a battery power supply mode;
the adapter power supply circuit is used for being connected with the adapter in the adapter power supply mode and outputting the electric energy of the adapter to the load and the battery; and is further configured to prevent the battery from supplying power to the load when in the adapter power mode.
2. The discrete component dual power supply switching circuit of claim 1, wherein the battery supply circuit includes a switch circuit and a first switch circuit, an input of the first switch circuit is connected to the battery, an output of the first switch circuit is connected to the adapter supply circuit, a controlled terminal of the first switch circuit is connected to the switch circuit, wherein,
the switch circuit is used for controlling the connection or disconnection of the first switch circuit in a battery power supply mode.
3. The discrete component dual power supply switching circuit of claim 2, wherein the first switching circuit is configured to be controlled by the power switching circuit to switch on or off a power supply path between the battery and the load in a battery power supply mode; for conducting a power supply path between the adapter and the battery when in adapter power mode.
4. The discrete component dual power switching circuit of claim 1, wherein the adapter power supply circuit comprises: a second switch circuit, a third switch circuit, a first voltage divider circuit, and a second voltage divider circuit, wherein,
the input end of the second switch circuit is connected with the adapter, the output end of the second switch circuit is connected with the third switch circuit, and the other output end of the second switch circuit is connected with the battery power supply circuit;
the first end of the third switch circuit is connected with the load, and the controlled end of the third switch circuit is connected with the second voltage division circuit;
the input end of the first voltage division circuit is connected with the adapter, and the output end of the first voltage division circuit is connected with the second voltage division circuit.
5. The discrete component dual power switching circuit of claim 4, wherein the second switching circuit, in an adapter power mode, is configured to conduct a power path between the adapter and the battery; the second switching circuit is also used to prevent the current of the battery from flowing back into the adapter when the adapter voltage is lower than the battery voltage.
6. The discrete component dual power switching circuit of claim 5, wherein the second switching circuit, in a battery powered mode, is configured to conduct a power supply path between the battery and the load.
7. The discrete component dual power switching circuit of claim 6, wherein the third switch circuit, in a battery powered mode, is configured to conduct a power supply path between the battery and the load; in an adapter power mode, for disconnecting a power supply path between the battery and the load.
8. The discrete component dual power supply switching circuit of claim 7, wherein the first voltage divider circuit and the second voltage divider circuit are turned off and the second voltage divider circuit is turned on to control the third switch circuit to be turned on in the battery-powered mode; and when the adapter is in a power supply mode, the first voltage division circuit is switched on, the second voltage division circuit is switched off, and the third switch circuit is controlled to be switched off.
9. The discrete component dual power switching circuit of claim 8, wherein the adapter supply circuit further comprises a schottky diode, an anode of the schottky diode is connected to the adapter, and a cathode of the schottky diode is connected to the load and to the output of the third switching circuit.
10. An electronic device comprising the discrete component dual power switching circuit of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921602572.1U CN210297317U (en) | 2019-09-24 | 2019-09-24 | Discrete component dual power supply switching circuit and electronic equipment |
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| CN201921602572.1U CN210297317U (en) | 2019-09-24 | 2019-09-24 | Discrete component dual power supply switching circuit and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977361A (en) * | 2022-02-22 | 2022-08-30 | 深圳市磐鼎科技有限公司 | Power supply circuit and panel terminal of dual supply double cell |
| CN115425720A (en) * | 2022-10-09 | 2022-12-02 | 南京微智新科技有限公司 | Power supply loop and electronic equipment |
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2019
- 2019-09-24 CN CN201921602572.1U patent/CN210297317U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977361A (en) * | 2022-02-22 | 2022-08-30 | 深圳市磐鼎科技有限公司 | Power supply circuit and panel terminal of dual supply double cell |
| CN115425720A (en) * | 2022-10-09 | 2022-12-02 | 南京微智新科技有限公司 | Power supply loop and electronic equipment |
| CN115425720B (en) * | 2022-10-09 | 2023-12-22 | 南京微智新科技有限公司 | Power supply loop and electronic equipment |
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