CN217335186U - Dual-power automatic switching circuit and dual-power supply circuit - Google Patents
Dual-power automatic switching circuit and dual-power supply circuit Download PDFInfo
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- CN217335186U CN217335186U CN202220189887.3U CN202220189887U CN217335186U CN 217335186 U CN217335186 U CN 217335186U CN 202220189887 U CN202220189887 U CN 202220189887U CN 217335186 U CN217335186 U CN 217335186U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The application discloses a dual-power automatic switching circuit and a dual-power supply circuit, wherein a first power MOS tube and a second power MOS tube are adopted as power supply MOS tubes to be respectively connected in series on a power supply circuit of a first power supply and a power supply circuit of a second power supply, a switch is respectively controlled by a first switch circuit and a second switch circuit, two input ends of a hysteresis comparator are respectively connected with the anode of the first power supply and the anode of the second power supply to compare the output voltages of the two power supplies, the output end of the hysteresis comparator is respectively connected with the control end of the first switch circuit and the control end of the second switch circuit, and because the enabling signal of the first switch circuit is opposite to the enabling signal of the second switch circuit, only one switch circuit is enabled at the same time, only one power supply output is used as a system power supply, compared with the prior art, the dual-power automatic switching is realized, and the loss is lower, and the power supply stability is high.
Description
Technical Field
The application relates to the technical field of dual power supply, in particular to a dual power supply automatic switching circuit and a dual power supply circuit.
Background
In order to increase the endurance time of electronic products, a plurality of electronic products use a dual-power supply circuit, the power supply modes of electronic products in the market at present comprise a USB power supply, a DC direct-current power supply, a lead-acid battery, a lithium battery, a fuel battery, a button battery, a dry battery, a solar cell panel and the like, the power supply voltages of various specifications and types of power supplies are different, the charging modes of rechargeable batteries of different types are also different, when two power supplies are used for supplying power, the situation that the voltages of two power supplies are different often exists, and the two power supplies need to be isolated.
In the existing market, a double-power-supply system mostly uses a relay to switch two paths of power supplies or uses a diode to connect the two paths of power supplies in parallel.
However, in the scheme of using the relay to switch the two power supplies, the relay has large power loss and high price, and needs to be controlled by a single chip in cooperation with a voltage detection circuit, which is not favorable for miniaturization application. And the scheme of connecting two power supplies in parallel by using two diodes can cause voltage loss due to the voltage drop of the diodes. The two schemes can cause the loss and waste of the power supply, the energy of the battery can not be fully utilized for high-power or low-power consumption long standby products, and the stability of the power supply is poor.
The technical problem to be solved by the technical personnel in the field is to provide a low-loss and high-stability dual-power automatic switching scheme.
SUMMERY OF THE UTILITY MODEL
The application aims at providing a dual power supply automatic switch-over circuit and dual power supply circuit, compares in prior art, has realized dual power supply automatic switch-over, and the loss is lower, and power supply stability is high.
In order to solve the above technical problem, the present application provides a dual power supply automatic switching circuit, including: the power supply circuit comprises a first power MOS tube, a second power MOS tube, a hysteresis comparator, a first switch circuit and a second switch circuit;
the drain electrode of the first power MOS tube and the positive input end of the hysteresis comparator are connected with the positive electrode of a first power supply, the drain electrode of the second power MOS tube and the negative input end of the hysteresis comparator are connected with the positive electrode of a second power supply, the grid electrode of the first power MOS tube is connected with the output end of the first switch circuit, the grid electrode of the second power MOS tube is connected with the output end of the second switch circuit, and the source electrode of the first power MOS tube is connected with the source electrode of the second power MOS tube and outputs the source electrode to a system power supply;
the output end of the hysteresis comparator is respectively connected with the control end of the first switch circuit and the control end of the second switch circuit, and the enable signal of the first switch circuit is opposite to the enable signal of the second switch circuit.
Optionally, the first switch circuit is specifically a first NMOS transistor, and the second switch circuit is specifically a first PMOS transistor.
Optionally, the first power MOS transistor and the second power MOS transistor are both specifically PMOS transistors;
the drain electrode of the first NMOS tube is connected with the grid electrode of the first power MOS tube, the drain electrode of the first PMOS tube is connected with the grid electrode of the second power MOS tube, the source electrode of the first NMOS tube and the source electrode of the first PMOS tube are both grounded, and the grid electrode of the first NMOS tube and the grid electrode of the first PMOS tube are both connected with the output end of the hysteresis comparator.
Optionally, the first switch circuit is a first NPN type triode, and the second switch circuit is a first PNP type triode.
Optionally, the first power MOS transistor and the second power MOS transistor are both specifically PMOS transistors;
the collector of the first NPN type triode is connected with the gate of the first power MOS transistor, the collector of the first PNP type triode is connected with the gate of the second power MOS transistor, the emitter of the first NPN type triode and the emitter of the first PNP type triode are both grounded, and the base of the first NPN type triode and the base of the first PNP type triode are both connected with the output end of the hysteresis comparator.
Optionally, the power supply terminal of the hysteresis comparator is connected with the system power supply.
In order to solve the above technical problem, the present application further provides a dual power supply circuit, including the dual power automatic switching circuit as described in any one of the above, further including: a first power supply and a second power supply.
Optionally, the first power supply and the second power supply are both rechargeable power supplies.
Optionally, the charging circuit further comprises a first charging circuit and a second charging circuit;
the input end of the first charging circuit and the input end of the second charging circuit are respectively used for being connected with an external power supply, the output end of the first charging circuit is connected with the anode of the first power supply, and the output end of the second charging circuit is connected with the anode of the second power supply.
Optionally, the first power supply and the second power supply are both specifically lithium batteries;
the first charging circuit and the second charging circuit are both specifically lithium battery management chips TP 4056.
The utility model provides a dual supply automatic transfer circuit, adopt first power MOS pipe and second power MOS pipe to establish ties respectively on the supply circuit of first power and the supply circuit of second power as the power supply MOS pipe, control switch by first switch circuit and second switch circuit respectively, the positive pole of connecting first power and the positive pole of second power respectively through two input of hysteresis comparator are used for comparing the output voltage size of two powers, the output of hysteresis comparator is connected with the control end of first switch circuit and the control end of second switch circuit respectively, and because the enable signal of first switch circuit is opposite with the enable signal of second switch circuit, thereby realize that only one switch circuit is enabled at the same moment, only power output of the same way is system power supply. The application provides a dual supply automatic switch-over circuit has realized dual supply automatic switch-over operation, need not outside single chip microcomputer control, and power MOS pipe compares in the diode loss can be neglected, and because the hysteresis comparator provides the hysteresis delay switching under the condition that two power output voltage are close, has avoided the unstable condition of power supply that frequent switching power caused.
The application also provides a dual power supply circuit, which has the beneficial effects and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of a first part of a dual power supply automatic switching circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a second part of a dual power supply automatic switching circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of the transmission characteristics of the hysteretic comparator.
Detailed Description
The core of the application is to provide a dual power supply automatic switching circuit and dual power supply circuit, compare in prior art, realized dual power supply automatic switching, and the loss is lower, and power supply stability is high.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of protection of the present application without any inventive step.
Example one
Fig. 1 is a circuit diagram of a first part of a dual power supply automatic switching circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a second part of a dual power supply automatic switching circuit according to an embodiment of the present application; fig. 3 is a schematic diagram of the transmission characteristics of the hysteretic comparator.
As shown in fig. 1 and fig. 2, the dual power supply automatic switching circuit provided in the embodiment of the present application includes: the circuit comprises a first power MOS tube Q1, a second power MOS tube Q2, a hysteresis comparator U1, a first switch circuit and a second switch circuit;
the drain of the first power MOS transistor Q1 and the positive input end of the hysteresis comparator U1 are connected to the positive electrode of the first power supply V1, the drain of the second power MOS transistor Q2 and the negative input end of the hysteresis comparator U1 are connected to the positive electrode of the second power supply V2, the gate of the first power MOS transistor Q1 is connected to the output end of the first switch circuit, the gate of the second power MOS transistor Q2 is connected to the output end of the second switch circuit, and the source of the first power MOS transistor Q1 is connected to the source of the second power MOS transistor Q2 and outputs the source of the first power MOS transistor Q1 as the system power supply Vsystem;
the output end of the hysteresis comparator U1 is connected to the control end of the first switch circuit and the control end of the second switch circuit, respectively, and the enable signal PowerEn of the first switch circuit is opposite to the enable signal PowerEn of the second switch circuit.
In specific implementation, the first power source V1 and the second power source V2 may specifically adopt a USB power source, a DC power source, a lead-acid battery, a lithium battery, a fuel cell, a button cell, a dry cell, a solar cell panel, and the like. If an alternative power supply is used, as shown in FIG. 1, J1 is the slot for the first power supply V1 and J2 is the slot for the second power supply V2. A first capacitor C1 may be provided at the positive pole of the first power source V1, and a second capacitor C2 may be provided at the positive pole of the second power source V2 for power filtering. The source of the first power MOS transistor Q1 and the source of the second power MOS transistor Q2 are connected to output a system power supply Vsystem for supplying power to loads in the system, and are grounded through a fifth capacitor C5.
The first switch circuit and the second switch circuit can specifically adopt switch circuits formed by MOS (metal oxide semiconductor) tubes, triodes or other low-power consumption electric control switches, and in order to achieve the effect that the enabling signal PowerEn of the first switch circuit is opposite to the enabling signal PowerEn of the second switch circuit, the first switch circuit and the second switch circuit can adopt the same kind of devices with opposite enabling signals PowerEn, or adopt phase inverters to form opposite enabling signals PowerEn.
As shown in fig. 2, the power supply terminal of the hysteresis comparator U1 may be connected to the system power supply Vsystem, so as to obtain a stable power supply voltage. The dual-power automatic switching circuit provided by the embodiment of the application further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3 and a fourth capacitor C4, wherein the first resistor R1 is disposed between the positive input end of the hysteretic comparator U1 and the positive electrode of the first power supply V1, the second resistor R2 is disposed between the negative input end of the hysteretic comparator U1 and the positive electrode of the second power supply V2, the first end of the third resistor R3 is connected with the positive input end of the hysteretic comparator U1, the first end of the fourth resistor R4 is connected with the output end of the hysteretic comparator U1, the second end of the fourth resistor R4, the second end of the fifth resistor R5, the second end of the third resistor R3, the first end of the fourth capacitor C4, the control end of the first switch circuit and the control end of the first switch circuit, the control end of the second switch circuit R5, the second end of the third resistor R3, the second end of the fifth resistor R3, the second end of the capacitor C3, and the control end of the second switch circuit, The power supply terminal of the hysteresis comparator U1 is connected to the system power supply Vsystem, and the first terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4 are grounded.
The hysteresis comparator U1 is also called Schmitt trigger, and is characterized in that when the signal is gradually increased or decreased, it has two thresholds which are not equal, and its transmission characteristic has the shape of "hysteresis" curve, so that it can avoid the unstable power supply caused by frequently switching power supply when two power supplies are close, and has strong anti-interference ability.
The transfer characteristic of the hysteretic comparator U1 is shown in fig. 3, where,
taking the first switch circuit as the high-level enable and the second switch circuit as the low-level enable, the input voltage condition of the hysteretic comparator U1 and the control result thereof are specifically as follows:
if the system initially supplies power to the first power supply V1, the output Vout of the hysteresis comparator U1 is at a high level, the first power MOS transistor Q1 is turned on, the second power MOS transistor Q2 is turned off, the first power supply V1 supplies power to the system, and Vsystem is V1;
when the voltage of the second power supply V2 rises to be higher than the voltage of the first power supply V1, the output Vout voltage of the hysteresis comparator U1 is inverted from high level to low level, the first power MOS transistor Q1 is turned off, the second power MOS transistor Q2 is turned on, the second power supply V2 supplies power to the system, and Vsystem is V2;
when the voltage of the first power supply V1 gradually decreases until the voltage of the second power supply V2 is greater than the voltage of the first power supply V1, the voltage of the output Vout of the hysteresis comparator U1 is inverted from a high level to a low level, the first power MOS transistor Q1 is turned off, the second power MOS transistor Q2 is turned on, the second power supply V2 supplies power to the system, and Vsystem is equal to V2.
If the system initially supplies power to the second power supply V2, the output Vout of the hysteresis comparator U1 is at a low level, the first power MOS transistor Q1 is turned off, the second power MOS transistor Q2 is turned on, the second power supply V2 supplies power to the system, and Vsystem is V2;
when the voltage of the first power supply V1 rises to be more than V2+ V th1 Then, the output Vout voltage of the hysteresis comparator U1 is inverted from low level to high level, the first power MOS transistor Q1 is turned on, the second power MOS transistor Q2 is turned off, the first power supply V1 supplies power to the system, and Vsystem is V1;
when the voltage of the second power supply V2 is gradually reduced to be less than V1+ V th2 The output Vout voltage of the hysteresis comparator U1 is inverted from low level to high level, the first power MOS transistor Q1 is turned on, the second power MOS transistor Q2 is turned off, the first power supply V1 supplies power to the system, and Vsystem is V1.
Example two
On the basis of the above embodiments, if the first switch circuit and the second switch circuit employ MOS transistors, as shown in fig. 1, the first switch circuit may employ a first NMOS transistor Q3, and the second switch circuit may employ a first PMOS transistor Q4.
On the basis, in order to ensure low power consumption, the first power MOS transistor Q1 and the second power MOS transistor Q2 are both PMOS transistors;
the drain of the first NMOS transistor Q3 is connected to the gate of the first power MOS transistor Q1, the drain of the first PMOS transistor Q4 is connected to the gate of the second power MOS transistor Q2, the source of the first NMOS transistor Q3 and the source of the first PMOS transistor Q4 are both grounded, and the gate of the first NMOS transistor Q3 and the gate of the first PMOS transistor Q4 are both connected to the output terminal of the hysteretic comparator U1.
In addition, the dual power supply automatic switching circuit provided by the embodiment of the application may further include a sixth resistor R6 and a seventh resistor R7, a first end of the sixth resistor R6 is connected to the gate of the first power MOS transistor Q1, a second end of the sixth resistor R6 is connected to the source of the first power MOS transistor Q1, a first end of the seventh resistor R7 is connected to the gate of the second power MOS transistor Q2, and a second end of the seventh resistor R7 is connected to the source of the second power MOS transistor Q2.
EXAMPLE III
On the basis of the above embodiment, if the first switch circuit and the second switch circuit employ triodes, the first switch circuit may employ a first NPN-type triode, and the second switch circuit may employ a first PNP-type triode.
On the basis, in order to ensure low power consumption, the first power MOS transistor Q1 and the second power MOS transistor Q2 are both PMOS transistors;
the collector of the first NPN type triode is connected with the gate of the first power MOS transistor Q1, the collector of the first PNP type triode is connected with the gate of the second power MOS transistor Q2, the emitter of the first NPN type triode and the emitter of the first PNP type triode are both grounded, and the base of the first NPN type triode and the base of the first PNP type triode are both connected with the output end of the hysteretic comparator U1.
Reference may be made to the above embodiments specifically for the manner in which the transistor is used as the switching circuit.
On the basis of the above detailed description of various embodiments corresponding to the dual-power automatic switching circuit, the application also discloses a dual-power supply circuit corresponding to the dual-power automatic switching circuit.
Example four
The dual power supply circuit provided by the embodiment of the application can include the dual power automatic switching circuit provided by any one of the above embodiments, and further includes: a first power supply V1 and a second power supply V2.
As shown in fig. 1, the first power source V1 and the second power source V2 may each employ a rechargeable power source, such as a lithium battery.
In order to facilitate charging, the dual-power supply circuit provided by the embodiment of the application can further comprise a first charging circuit and a second charging circuit;
the input end of the first charging circuit and the input end of the second charging circuit are respectively used for being connected with an external power supply, the output end of the first charging circuit is connected with the anode of a first power supply V1, and the output end of the second charging circuit is connected with the anode of a second power supply V2.
If the first power supply V1 and the second power supply V2 both adopt lithium batteries; the first charging circuit and the second charging circuit can both adopt a lithium battery management chip TP 4056.
In addition, the first charging circuit further comprises a first indicator light, a second indicator light and an eighth resistor R8, the first indicator light and the second indicator light both adopt LEDs, an anode of the first indicator light LED1, an anode of the second indicator light LED2 and a VCC pin of the lithium battery management chip U2 are respectively connected with a charging port VBUS, a cathode of the first indicator light LED1 is connected with a CHRG pin of the lithium battery management chip U2, a cathode of the second indicator light LED2 is connected with a STDBY pin of the lithium battery management chip U2, a BAT end of the lithium battery management chip U2 is connected with an anode of a first power supply V1, a PROG pin of the lithium battery management chip U2 is connected with a first end of the eighth resistor R8, and a GND pin of the lithium battery management chip U2 and a second end of the eighth resistor R8 are grounded. The second charging circuit further comprises a third indicator light, a fourth indicator light and a ninth resistor R9, the third indicator light and the fourth indicator light are both LEDs, the anode of the third indicator light LED3, the anode of the fourth indicator light LED4 and the VCC pin of the lithium battery management chip U3 are respectively connected with the VBUS of the charging port, the cathode of the third indicator light LED3 is connected with the CHRG pin of the lithium battery management chip U3, the cathode of the fourth indicator light LED4 is connected with the STDBY pin of the lithium battery management chip U3, the BAT end of the lithium battery management chip U3 is connected with the anode of the first power supply V1, the PROG pin of the lithium battery management chip U3 is connected with the first end of the ninth resistor R9, and the GND pin of the lithium battery management chip U3 and the second end of the ninth resistor R9 are grounded.
The charging port VBUS corresponding to the first charging circuit is grounded via a sixth capacitor C6, and the charging port VBUS corresponding to the second charging circuit is grounded via a seventh capacitor C7.
The dual-power automatic switching circuit and the dual-power supply circuit provided by the application are described in detail above. The embodiments are described in a progressive manner, the emphasis of each embodiment is different from that of other embodiments, and the same and similar parts among the embodiments are referred to each other.
It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A dual power supply automatic switching circuit, comprising: the power supply circuit comprises a first power MOS tube, a second power MOS tube, a hysteresis comparator, a first switch circuit and a second switch circuit;
the drain electrode of the first power MOS tube and the positive input end of the hysteresis comparator are connected with the positive electrode of a first power supply, the drain electrode of the second power MOS tube and the negative input end of the hysteresis comparator are connected with the positive electrode of a second power supply, the grid electrode of the first power MOS tube is connected with the output end of the first switch circuit, the grid electrode of the second power MOS tube is connected with the output end of the second switch circuit, and the source electrode of the first power MOS tube is connected with the source electrode of the second power MOS tube and outputs the source electrode to a system power supply;
the output end of the hysteresis comparator is respectively connected with the control end of the first switch circuit and the control end of the second switch circuit, and the enable signal of the first switch circuit is opposite to the enable signal of the second switch circuit.
2. The dual-power-supply automatic switching circuit of claim 1, wherein the first switching circuit is a first NMOS transistor, and the second switching circuit is a first PMOS transistor.
3. The dual-power automatic switching circuit of claim 2, wherein the first power MOS transistor and the second power MOS transistor are both PMOS transistors;
the drain electrode of the first NMOS tube is connected with the grid electrode of the first power MOS tube, the drain electrode of the first PMOS tube is connected with the grid electrode of the second power MOS tube, the source electrode of the first NMOS tube and the source electrode of the first PMOS tube are both grounded, and the grid electrode of the first NMOS tube and the grid electrode of the first PMOS tube are both connected with the output end of the hysteresis comparator.
4. The dual-power automatic switching circuit of claim 1, wherein the first switching circuit is a first NPN type transistor, and the second switching circuit is a first PNP type transistor.
5. The dual-power-supply automatic switching circuit according to claim 4, wherein the first power MOS transistor and the second power MOS transistor are both PMOS transistors;
the collector of the first NPN type triode is connected with the gate of the first power MOS transistor, the collector of the first PNP type triode is connected with the gate of the second power MOS transistor, the emitter of the first NPN type triode and the emitter of the first PNP type triode are both grounded, and the base of the first NPN type triode and the base of the first PNP type triode are both connected with the output end of the hysteresis comparator.
6. The dual-power-supply automatic switching circuit of claim 1, wherein a power supply terminal of the hysteresis comparator is connected with the system power supply.
7. A dual power supply circuit comprising the dual power automatic switching circuit of any one of claims 1 to 6, further comprising: a first power supply and a second power supply.
8. The dual power supply circuit of claim 7, wherein the first power supply and the second power supply are both rechargeable power supplies.
9. The dual power supply circuit of claim 8, further comprising a first charging circuit and a second charging circuit;
the input end of the first charging circuit and the input end of the second charging circuit are respectively used for connecting an external power supply, the output end of the first charging circuit is connected with the anode of the first power supply, and the output end of the second charging circuit is connected with the anode of the second power supply.
10. The dual power supply circuit of claim 9, wherein the first power supply and the second power supply are each embodied as lithium batteries;
the first charging circuit and the second charging circuit are both specifically lithium battery management chips TP 4056.
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| CN202220189887.3U CN217335186U (en) | 2022-01-24 | 2022-01-24 | Dual-power automatic switching circuit and dual-power supply circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742954A (en) * | 2022-09-29 | 2023-09-12 | 荣耀终端有限公司 | Power supply switching circuit and electronic equipment |
| CN117791846A (en) * | 2024-02-26 | 2024-03-29 | 西安第六镜网络科技有限公司 | Dual-power conversion device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116742954A (en) * | 2022-09-29 | 2023-09-12 | 荣耀终端有限公司 | Power supply switching circuit and electronic equipment |
| CN116742954B (en) * | 2022-09-29 | 2024-08-30 | 荣耀终端有限公司 | Power supply switching circuit and electronic equipment |
| CN117791846A (en) * | 2024-02-26 | 2024-03-29 | 西安第六镜网络科技有限公司 | Dual-power conversion device |
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