CN113381505A - Power circuit and power supply method thereof - Google Patents
Power circuit and power supply method thereof Download PDFInfo
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- CN113381505A CN113381505A CN202110932136.6A CN202110932136A CN113381505A CN 113381505 A CN113381505 A CN 113381505A CN 202110932136 A CN202110932136 A CN 202110932136A CN 113381505 A CN113381505 A CN 113381505A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit 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
- H02J9/06—Circuit 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
- H02J9/061—Circuit 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit 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
- H02J9/06—Circuit 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
Abstract
The application discloses a power supply circuit and a power supply method thereof, wherein the power supply circuit comprises an external direct current power supply module, an internal direct current power supply module, a boosting output module and a logic control module, the logic control module can be used for logically controlling the power supply circuit to directly output a first direct current voltage, or when the external direct current power supply module does not output, the logic control power supply circuit outputs a second direct current voltage boosted by the boosting output module, the logic hardware directly switches the technical scheme of internal and external power supply, the circuit topological structure of internal and external power supply switching is simplified, and the switching reliability is improved; meanwhile, the use of singlechip resources and switching elements is saved, and the cost reduction and miniaturization of the power supply circuit are facilitated.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to a power supply circuit and a power supply method thereof.
Background
The switching mode of inside power supply and outside power supply among traditional technical scheme's power supply circuit, most of need detect the voltage information of outside power supply through the control module that has control algorithm, then switch inside power supply and outside power supply according to control module's judged result again, however, this kind of switching mode is more loaded down with trivial details, needs to occupy the control resource, and realizes that the circuit topological structure that inside and outside power supply switches is too complicated.
Disclosure of Invention
The application provides a power supply circuit and a power supply method thereof, which are used for relieving the technical problem of complex topological structure of internal and external power supply switching in the power supply circuit.
In a first aspect, the present application provides a power circuit, which includes an external dc power supply module 100, an internal dc power supply module 200, a boost output module 300, and a logic control module 400, where the external dc power supply module 100 is configured to output a first dc voltage; the internal dc power supply module 200 is configured to output a second dc voltage; the input end of the boost output module 300 is electrically connected with the output end of the internal dc power supply module 200, and the output end of the boost output module 300 is electrically connected with the output end of the external dc power supply module 100; the logic control module 400 is electrically connected to the output end of the external dc power supply module 100, the output end of the internal dc power supply module 200, and the enable end of the boost output module 300, and is configured to control the power supply circuit to selectively output the first dc voltage or the second dc voltage boosted by the boost output module 300 according to the level logic operation result of the first dc voltage and the second dc voltage, and the power supply priority of the external dc power supply module 100 is higher than the power supply priority of the internal dc power supply module 200.
In some embodiments, the logic control module 400 includes a nand gate U1, a first logic input terminal of the nand gate U1 is electrically connected to the positive power supply terminal of the nand gate U1 and the output terminal of the internal dc power supply module 200, a second logic input terminal of the nand gate U1 is electrically connected to the output terminal of the external dc power supply module 100, and an output terminal of the nand gate U1 is electrically connected to the enable terminal of the boost output module 300; when the nand gate U1 outputs a logic high potential, the boost output module 300 is in a working state, and the internal dc power supply module 200 is in a power supply state; when the nand gate U1 outputs a logic low voltage, the boost output module 300 is in a stop state, and the external dc power supply module 100 is in a power supply state.
In some embodiments, the boost output module 300 includes a boost chip U2, the boost rectification control terminal of the boost chip U2 is electrically connected to the positive power terminal of the boost chip U2 and the output terminal of the internal dc power supply module 200, the enable terminal of the boost chip U2 is electrically connected to the output terminal of the nand gate U1, the negative power terminal of the boost chip U2 is grounded, and the output terminal of the boost chip U2 is electrically connected to the feedback terminal of the boost chip U2 and the output terminal of the external dc power supply module 100.
In some embodiments, the boost output module 300 further includes a first energy-storage capacitor C3, one end of the first energy-storage capacitor C3 is electrically connected to the output end of the boost chip U2, and the other end of the first energy-storage capacitor C3 is grounded, so as to maintain the voltage-stabilized output of the power circuit during the power supply switching process from the external dc power supply module 100 to the internal dc power supply module 200.
In some embodiments, the boost output module 300 further includes a first resistor R2, a second resistor R4, a second energy storage capacitor C4, an output capacitor C5, a first input capacitor C6, a second input capacitor C7, a third input capacitor C8, and an input inductor L1, one end of the first resistor R2 is electrically connected to the output end of the boost chip U2, and the other end of the first resistor R2 is electrically connected to the feedback end of the boost chip U2; one end of the second resistor R4 is electrically connected with the feedback end of the boost chip U2, and the other end of the second resistor R4 is grounded; one end of the second energy storage capacitor C4 is electrically connected with the output end of the boost chip U2, and the other end of the second energy storage capacitor C4 is grounded; one end of the output capacitor C5 is electrically connected with the output end of the boost chip U2, and the other end of the output capacitor C5 is grounded; one end of the first input capacitor C6 is electrically connected with the positive power supply terminal of the boost chip U2, and the other end of the first input capacitor C6 is grounded; one end of the second input capacitor C7 is electrically connected with the positive power supply terminal of the boost chip U2, and the other end of the second input capacitor C7 is grounded; one end of the third input capacitor C8 is electrically connected with the positive power supply terminal of the boost chip U2, and the other end of the third input capacitor C8 is grounded; one end of the input inductor L1 is electrically connected to the output end of the internal dc power supply module 200, and the other end of the input inductor L1 is electrically connected to the boost rectification control end of the boost chip U2.
In some embodiments, the external dc power supply module 100 includes a usb interface, a positive power pin of the usb interface is electrically connected to the output terminal of the boost output module 300, and a negative power pin of the usb interface is grounded.
In some embodiments, the internal dc power module 200 includes at least one dry cell battery.
In a second aspect, the present application provides a power supply method of a power supply circuit, including: configuring an external direct current power supply module 100 and an internal direct current power supply module 200 in a power circuit, wherein the external direct current power supply module 100 is used for outputting a first direct current voltage, and the internal direct current power supply module 200 is used for outputting a second direct current voltage; the input end of the boost output module 300 is electrically connected with the output end of the internal dc power supply module 200, and the output end of the boost output module 300 is electrically connected with the output end of the external dc power supply module 100; and electrically connecting the logic control module 400 with the output terminal of the external dc power supply module 100, the output terminal of the internal dc power supply module 200, and the enable terminal of the boost output module 300, so as to control the power supply circuit to selectively output the first dc voltage or the second dc voltage boosted by the boost output module 300 according to the level logic operation result of the first dc voltage and the second dc voltage, and construct that the power supply priority of the external dc power supply module 100 is higher than the power supply priority of the internal dc power supply module 200.
In some embodiments, the power supply method further comprises: the logic control module 400 is configured to be a nand gate U1, a first logic input end of the nand gate U1 is electrically connected with a power supply positive end of the nand gate U1 and an output end of the internal dc power supply module 200, a second logic input end of the nand gate U1 is electrically connected with an output end of the external dc power supply module 100, and an output end of the nand gate U1 is electrically connected with an enable end of the boost output module 300; when the nand gate U1 outputs a logic high potential, the nand gate U1 controls the boost output module 300 to be in a working state, and the power circuit outputs a second direct-current voltage boosted by the boost output module 300; or in response to the nand gate U1 outputting a logic low voltage, the nand gate U1 controls the boost output module 300 to be in a stop state, and the power circuit outputs the first dc voltage.
In some embodiments, the power supply method further comprises: the first energy storage capacitor C3 is electrically connected to the output end of the boost output module 300; in the process of switching the power supply from the external dc power supply module 100 to the internal dc power supply module 200, the first energy storage capacitor C3 outputs electric energy to maintain the regulated output of the power circuit.
According to the power supply circuit and the power supply method thereof, the logic control module 400 can be used for logically controlling the power supply circuit to directly output the first direct current voltage, or when the external direct current power supply module 100 does not output, the logic control power supply circuit outputs the second direct current voltage boosted by the boosting output module 300, the logic hardware directly switches the internal and external power supply technical scheme, the circuit topology structure for switching the internal and external power supplies is simplified, and the switching reliability is improved; meanwhile, the use of singlechip resources and switching elements is saved, and the cost reduction and miniaturization of the power supply circuit are facilitated.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present disclosure.
Fig. 3 is a true value diagram of a nand gate according to an embodiment of the present disclosure.
Fig. 4 is a schematic flowchart of a power supply method of a power supply circuit according to an embodiment of the present disclosure.
Detailed Description
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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 4, as shown in fig. 1, the present embodiment provides a power circuit, which includes an external dc power supply module 100, an internal dc power supply module 200, a boost output module 300, and a logic control module 400, where the external dc power supply module 100 is configured to output a first dc voltage; the internal dc power supply module 200 is configured to output a second dc voltage; the input end of the boost output module 300 is electrically connected with the output end of the internal dc power supply module 200, and the output end of the boost output module 300 is electrically connected with the output end of the external dc power supply module 100; the logic control module 400 is electrically connected to the output end of the external dc power supply module 100, the output end of the internal dc power supply module 200, and the enable end of the boost output module 300, and is configured to control the power supply circuit to selectively output the first dc voltage or the second dc voltage boosted by the boost output module 300 according to the level logic operation result of the first dc voltage and the second dc voltage, and the power supply priority of the external dc power supply module 100 is higher than the power supply priority of the internal dc power supply module 200.
It can be understood that, in the power supply circuit provided in this embodiment, the logic control module 400 may logically control the power supply circuit to directly output the first dc voltage, or when the external dc power supply module 100 has no output, the logic control power supply circuit outputs the second dc voltage boosted by the boost output module 300, and this logic hardware directly switches the internal and external power supply technical scheme, thereby simplifying the circuit topology structure for switching the internal and external power supplies and improving the reliability of the switching; meanwhile, the use of singlechip resources and switching elements is saved, and the cost reduction and miniaturization of the power supply circuit are facilitated.
It should be noted that the first dc voltage may be higher than the second dc voltage. The first direct current voltage may be equal to the boosted second direct current voltage.
As shown in fig. 2 and fig. 3, in one embodiment, the logic control module 400 includes a nand gate U1, a first logic input a of the nand gate U1 is electrically connected to the positive power supply terminal of the nand gate U1 and the output terminal of the internal dc power supply module 200, a second logic input B of the nand gate U1 is electrically connected to the output terminal of the external dc power supply module 100, and an output terminal Y of the nand gate U1 is electrically connected to the enable terminal of the boost output module 300; when the nand gate U1 outputs a logic high potential, the boost output module 300 is in a working state, and the internal dc power supply module 200 is in a power supply state; when the nand gate U1 outputs a logic low voltage, the boost output module 300 is in a stop state, and the external dc power supply module 100 is in a power supply state.
Note that, the potential of the first logic input terminal a is a logic low potential "0", the potential of the second logic input terminal B is a logic low potential "0", and at this time, the potential of the output terminal Y of the nand gate U1 is a logic high potential "1". The potential of the first logic input terminal a is logic low potential "0", the potential of the second logic input terminal B is logic high potential "1", and at this time, the potential of the output terminal Y of the nand gate U1 is logic high potential "1". The first logic input terminal a has a logic high potential "1", the second logic input terminal B has a logic low potential "0", and the output terminal Y of the nand gate U1 has a logic high potential "1". The potential of the first logic input terminal a is logic high potential "1", the potential of the second logic input terminal B is logic high potential "1", and at this time, the potential of the output terminal Y of the nand gate U1 is logic low potential "0".
The nand gate U1 may be, but not limited to, NL17SZ00DFT2G, or may be another nand device or nand circuit having the same function as the nand gate U1.
In one embodiment, the logic control module 400 may further include a third resistor R1, one end of the third resistor R1 is electrically connected to the second logic input terminal B, and the other end of the third resistor R1 is grounded. It is understood that the third circuit can divide the potential of the second logic input terminal B, so that the acceptable voltage of the second logic input terminal B can be adapted to the output voltage of the external dc power supply module 100.
In one embodiment, the boost output module 300 includes a boost chip U2, the boost rectification control terminal of the boost chip U2 is electrically connected to the positive power terminal of the boost chip U2 and the output terminal of the internal dc power supply module 200, the enable terminal of the boost chip U2 is electrically connected to the output terminal Y of the nand gate U1, the negative power terminal of the boost chip U2 is grounded, and the output terminal of the boost chip U2 is electrically connected to the feedback terminal of the boost chip U2 and the output terminal of the external dc power supply module 100.
It should be noted that the type of the boost chip U2 can be, but is not limited to, SGM6603-ADJYN6G/TR, the input voltage range is 0.9V-5.5V, and the output current is as high as 500mA when 3.3V is boosted to 5V. The quiescent current can be 30 muA under the output voltage of 3.3V, the working efficiency is up to more than 90 percent, the output voltage of 6V has a clamping function, an external MOSFET and a Schottky diode are not needed, and the reverse flow prevention function is realized. The fixed output voltage can be, but is not limited to, 3.3V, 5.0V, and various adjustable output voltages. The battery can be widely applied to portable equipment powered by dry batteries and lithium battery powered USB OTG 5V output application. The working temperature range can reach the industrial standard of-40 ℃ to +85 ℃. Of course, the boost chip U2 may be another boost device or a boost circuit having the same function as the boost chip U2.
In one embodiment, the boost output module 300 further includes a first energy-storage capacitor C3, one end of the first energy-storage capacitor C3 is electrically connected to the output end of the boost chip U2, and the other end of the first energy-storage capacitor C3 is grounded, so as to maintain the regulated output of the power circuit during the power supply switching process from the external dc power supply module 100 to the internal dc power supply module 200.
In one embodiment, the boost output module 300 further includes at least one of a first resistor R2, a second resistor R4, a second energy storage capacitor C4, an output capacitor C5, a first input capacitor C6, a second input capacitor C7, a third input capacitor C8, and an input inductor L1. One end of the first resistor R2 is electrically connected to the output end of the boost chip U2, and the other end of the first resistor R2 is electrically connected to the feedback end of the boost chip U2. One end of the second resistor R4 is electrically connected to the feedback end of the boost chip U2, and the other end of the second resistor R4 is grounded. One end of the second energy storage capacitor C4 is electrically connected to the output end of the boost chip U2, and the other end of the second energy storage capacitor C4 is grounded. One end of the output capacitor C5 is electrically connected to the output end of the boost chip U2, and the other end of the output capacitor C5 is grounded. One end of the first input capacitor C6 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the first input capacitor C6 is grounded. One end of the second input capacitor C7 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the second input capacitor C7 is grounded. One end of the third input capacitor C8 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the third input capacitor C8 is grounded. One end of the input inductor L1 is electrically connected to the output end of the internal dc power supply module 200, and the other end of the input inductor L1 is electrically connected to the boost rectification control end of the boost chip U2.
In one embodiment, the external dc power supply module 100 includes a usb interface, a positive power pin of the usb interface is electrically connected to the output terminal of the boost output module 300, and a negative power pin of the usb interface is grounded.
The universal serial bus interface can be a TYPE-C port J1.
In one embodiment, the external dc power supply module 100 may further include a first filter capacitor C1 and a second filter capacitor C2, one end of the first filter capacitor C1 is electrically connected to the positive power pin of the usb interface, the other end of the first filter capacitor C1 is grounded, one end of the second filter capacitor C2 is electrically connected to the positive power pin of the usb interface, and the other end of the second filter capacitor C2 is grounded.
In one embodiment, the internal DC power module 200 includes at least one dry cell battery. At least one dry battery can be connected in series to increase output voltage, or connected in parallel to increase output current, or connected in series and parallel to increase output voltage and output current.
In one embodiment, the internal DC power module 200 may further include a dry cell compartment that may be used to carry at least one dry cell.
As shown in fig. 4, in one embodiment, the present embodiment provides a power supply method of a power supply circuit, which includes the following steps:
step S10: the external dc power supply module 100 and the internal dc power supply module 200 are configured in the power circuit, the external dc power supply module 100 is configured to output a first dc voltage, and the internal dc power supply module 200 is configured to output a second dc voltage.
Step S20: the input terminal of the boost output module 300 is electrically connected to the output terminal of the internal dc power supply module 200, and the output terminal of the boost output module 300 is electrically connected to the output terminal of the external dc power supply module 100.
And step S30: the logic control module 400 is electrically connected to the output end of the external dc power supply module 100, the output end of the internal dc power supply module 200, and the enable end of the boost output module 300, so as to control the power circuit to selectively output the first dc voltage or the second dc voltage boosted by the boost output module 300 according to the level logic operation result of the first dc voltage and the second dc voltage, and construct a power supply priority of the external dc power supply module 100 higher than the power supply priority of the internal dc power supply module 200.
It can be understood that, in the power supply method of the power supply circuit provided in this embodiment, the logic control module 400 may logically control the power supply circuit to directly output the first dc voltage, or when the external dc power supply module 100 has no output, the logic control power supply circuit outputs the second dc voltage boosted by the boost output module 300, and this logic hardware directly switches the internal and external power supply technical scheme, thereby simplifying the circuit topology structure for switching the internal and external power supplies and improving the reliability of the switching; meanwhile, the use of singlechip resources and switching elements is saved, and the cost reduction and miniaturization of the power supply circuit are facilitated.
In one embodiment, the power supply method further includes: the logic control module 400 is configured to be a nand gate U1, a first logic input end a of the nand gate U1 is electrically connected with a power supply positive end of the nand gate U1 and an output end of the internal dc power supply module 200, a second logic input end B of the nand gate U1 is electrically connected with an output end of the external dc power supply module 100, and an output end Y of the nand gate U1 is electrically connected with an enable end of the boost output module 300; when the nand gate U1 outputs a logic high potential, the nand gate U1 controls the boost output module 300 to be in a working state, and the power circuit outputs a second direct-current voltage boosted by the boost output module 300; or in response to the nand gate U1 outputting a logic low voltage, the nand gate U1 controls the boost output module 300 to be in a stop state, and the power circuit outputs the first dc voltage.
In one embodiment, the power supply method further includes: the first energy storage capacitor C3 is electrically connected to the output end of the boost output module 300; in the process of switching the power supply from the external dc power supply module 100 to the internal dc power supply module 200, the first energy storage capacitor C3 outputs electric energy to maintain the regulated output of the power circuit.
In summary, the power circuit or the power supply method thereof provided by the above embodiments may have the following three operating states:
the first working state: the internal direct current power supply module supplies power, and the working process is as follows:
two dry batteries (the dry battery can be a common AA battery or a common AAA battery) are arranged on the dry battery bin J2, the dry battery bins are connected in series, the voltage is in the range of 1.2-1.5V when a single dry battery releases most of the capacity, and the effective voltage output by the two dry batteries after being connected in series is in the range of 2.4-3V, namely the voltage is VCC in figure 2. Pin 5 of the nand gate U1 of the logic device is connected to VCC, the nand gate U1 starts to operate after being powered on, and performs logic determination, pin 2 of the nand gate U1 is connected to VCC, pin 2 of the nand gate U1 is obtained to be at a high level, that is, the logic level of the first logic input terminal a of the nand gate U1 is at a high level "1", pin 1 of the nand gate U1 is connected to the third resistor R1 of 100K Ω, the other end of the third resistor R1 is grounded, pin 1 of the nand gate U1, that is, the logic level of the second logic input terminal B is at a low level "0", and the output terminal Y of the nand gate U1, that is, pin 4 thereof is at a high level "1", according to a truth table of the nand gate shown in fig. 3. The pin 3 of the boost chip U2 is an enable pin or an enable end thereof, the pin 3 of the boost chip U2 is connected with the pin 4 of the NAND gate U1, the pin 3 of the boost chip U2 is at a high level, the boost chip U2 starts to work, and the pin 5 of the boost chip U2 outputs 5V direct current voltage VDD to be supplied to a rear-stage circuit for use.
The second working state: the condition of external power supply is accessed when the dry battery supplies power, and the working process is as follows:
after the first operating state, the TYPE-C port J1 is connected to an external power supply with a 5V dc voltage, the external power supply is connected to pin 1 of the nand gate U1 after being filtered by the first filter capacitor and the second filter capacitor, the level of pin 1 of U1 changes from low level to high level, that is, the logic level of the second logic input B of the nand gate U1 is high level "1", the logic level of the first logic input a of the nand gate U1 is high level "1", and the logic level of the output Y of the nand gate U1, that is, pin 4, changes to low level "0" according to the truth table of the nand gate shown in fig. 3. That is, the level of the pin 3 of the boost chip U2 becomes low, the boost chip U2 turns off, and the 5V dc voltage VDD boosted by the boost chip U2 disappears. Since the external power supply is also connected to the 5V dc voltage VDD, the presence of the 5V dc voltage VDD is maintained by the external power supply. The electric quantity of the dry battery is not used after the voltage boosting chip U2 is turned off, so that the energy of the dry battery is not consumed under the condition of external power supply, and the cruising ability of the internal dry battery is prolonged.
The third working state: the condition of removing external power supply after external power supply is accessed during dry battery power supply is specifically as follows:
after the second operation state, next, the TYPE-C port J1 removes the external power supply with the voltage of 5V, the level of the pin 1 of the nand gate U1 changes from high level to low level, i.e., the logic level of the second logic input B of the nand gate U1 changes to low level "0", the logic level of the first logic input a of the nand gate U1 is high level "1", and the output Y of the nand gate U1, i.e., the pin 4 thereof, changes to high level "1" according to the truth table of the nand gate shown in fig. 3. That is, the voltage level of the pin 3 of the boost chip U2 becomes high, the boost chip U2 is turned on, the turn-on time of the boost chip U2 is known to be about 300uS by the data manual, in order to prevent the drop of the 5V dc voltage VDD during the turn-on time of the boost chip U2, the 5V dc voltage VDD is maintained to be supplied by at least one of the first energy storage capacitor C3 and the second energy storage capacitor C4 during this time, and the 5V dc voltage VDD is continuously supplied to the boost chip U2 after the boost chip U2 is completely turned on.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The power circuit and the power supply method thereof provided by the embodiment of the present application are introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A power supply circuit, comprising:
an external DC power supply module (100) for outputting a first DC voltage;
an internal DC supply module (200) for outputting a second DC voltage;
the input end of the boost output module (300) is electrically connected with the output end of the internal direct current power supply module (200), and the output end of the boost output module (300) is electrically connected with the output end of the external direct current power supply module (100); and
logic control module (400), with the output of outside DC power supply module (100), the output of inside DC power supply module (200) and boost output module (300) enable end electric connection, be used for according to first direct current voltage with second direct current voltage's level logic operation result, control power supply circuit chooses to export first direct current voltage or warp the second direct current voltage after boost output module (300) steps up, just the power supply priority of outside DC power supply module (100) is higher than the power supply priority of inside DC power supply module (200).
2. The power supply circuit according to claim 1, wherein the logic control module (400) comprises:
a first logic input end of the nand gate U1 is electrically connected with a positive power supply end of the nand gate U1 and an output end of the internal dc power supply module (200), a second logic input end of the nand gate U1 is electrically connected with an output end of the external dc power supply module (100), and an output end of the nand gate U1 is electrically connected with an enable end of the boost output module (300);
when the nand gate U1 outputs a logic high potential, the boost output module (300) is in a working state, and the internal dc power supply module (200) is in a power supply state; when the nand gate U1 outputs a logic low voltage, the boost output module (300) is in a stop state, and the external dc power supply module (100) is in a power supply state.
3. The power supply circuit according to claim 2, wherein the boost output module (300) comprises:
boost chip U2, boost chip U2 the boost rectification control end with boost chip U2 the power positive end the output electric connection of inside direct current supply module (200), boost chip U2 the enable end with NAND gate U1's output electric connection, boost chip U2's power negative terminal ground connection, boost chip U2's output with boost chip U2's feedback end, outside direct current supply module (100)'s output electric connection.
4. A power supply circuit according to claim 3, wherein the boost output module (300) further comprises:
one end of the first energy storage capacitor C3 is electrically connected with the output end of the boost chip U2, and the other end of the first energy storage capacitor C3 is grounded, so that the voltage-stabilized output of the power supply circuit is maintained in the power supply switching process from the external dc power supply module (100) to the internal dc power supply module (200).
5. The power supply circuit according to claim 4, wherein the boost output module (300) further comprises:
one end of the first resistor R2 is electrically connected to the output end of the boost chip U2, and the other end of the first resistor R2 is electrically connected to the feedback end of the boost chip U2;
one end of the second resistor R4 is electrically connected with the feedback end of the boost chip U2, and the other end of the second resistor R4 is grounded;
one end of the second energy storage capacitor C4 is electrically connected with the output end of the boost chip U2, and the other end of the second energy storage capacitor C4 is grounded;
one end of the output capacitor C5 is electrically connected with the output end of the boost chip U2, and the other end of the output capacitor C5 is grounded;
a first input capacitor C6, wherein one end of the first input capacitor C6 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the first input capacitor C6 is grounded;
one end of the second input capacitor C7 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the second input capacitor C7 is grounded;
one end of the third input capacitor C8 is electrically connected to the positive power supply terminal of the boost chip U2, and the other end of the third input capacitor C8 is grounded; and
one end of the input inductor L1 is electrically connected with the output end of the internal direct current power supply module (200), and the other end of the input inductor L1 is electrically connected with the boost rectification control end of the boost chip U2.
6. The power supply circuit according to claim 1, characterized in that the external direct current supply module (100) comprises:
and the power supply positive pin of the universal serial bus interface is electrically connected with the output end of the boost output module (300), and the power supply negative pin of the universal serial bus interface is grounded.
7. A power supply circuit according to any one of claims 1 to 6, characterized in that the internal DC power supply module (200) comprises at least one dry cell battery.
8. A method of powering a power circuit, comprising:
configuring an external direct current power supply module (100) and an internal direct current power supply module (200) in the power circuit, wherein the external direct current power supply module (100) is used for outputting a first direct current voltage, and the internal direct current power supply module (200) is used for outputting a second direct current voltage;
the input end of the boost output module (300) is electrically connected with the output end of the internal direct current power supply module (200), and the output end of the boost output module (300) is electrically connected with the output end of the external direct current power supply module (100); and
the power supply circuit is electrically connected with the logic control module (400), the output end of the external direct current supply module (100), the output end of the internal direct current supply module (200) and the enabling end of the boosting output module (300), so that the power supply circuit can select to output the first direct current voltage or the second direct current voltage boosted by the boosting output module (300) according to the level logic operation result of the first direct current voltage and the second direct current voltage, and the power supply priority of the external direct current supply module (100) is higher than that of the internal direct current supply module (200).
9. The power supply method according to claim 8, characterized by further comprising:
configuring the logic control module (400) as a nand gate U1, wherein a first logic input terminal of the nand gate U1 is electrically connected to a power supply positive terminal of the nand gate U1 and an output terminal of the internal dc power supply module (200), a second logic input terminal of the nand gate U1 is electrically connected to an output terminal of the external dc power supply module (100), and an output terminal of the nand gate U1 is electrically connected to an enable terminal of the boost output module (300);
when the NAND gate U1 outputs a logic high potential, the NAND gate U1 controls the boost output module (300) to be in a working state, and the power supply circuit outputs a second direct-current voltage boosted by the boost output module (300);
or in response to the nand gate U1 outputting a logic low voltage, the nand gate U1 controls the boost output module (300) to be in a stop state, and the power circuit outputs the first dc voltage.
10. The power supply method according to claim 9, characterized by further comprising:
the first energy storage capacitor C3 is electrically connected to the output end of the boost output module (300);
in the process of switching the power supply from the external dc power supply module (100) to the internal dc power supply module (200), the first energy storage capacitor C3 outputs electric energy to maintain the regulated output of the power circuit.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09274059A (en) * | 1996-04-04 | 1997-10-21 | Mitsubishi Electric Corp | Voltage detection circuit for auxiliary battery |
| CN102891923A (en) * | 2011-07-25 | 2013-01-23 | 深圳市福智软件技术有限公司 | Mobile terminal and power automatic switching method thereof |
| CN202856409U (en) * | 2012-10-10 | 2013-04-03 | 惠州市米琦通信设备有限公司 | Mobile phone boost charging wire and mobile phone charging system |
| CN103683481A (en) * | 2013-12-27 | 2014-03-26 | 无锡致新电子科技有限公司 | Non-loss monolithic integration power supply selective circuit |
| CN209786868U (en) * | 2019-04-29 | 2019-12-13 | 广州汽车集团股份有限公司 | backup battery hardware switching circuit |
-
2021
- 2021-08-13 CN CN202110932136.6A patent/CN113381505B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09274059A (en) * | 1996-04-04 | 1997-10-21 | Mitsubishi Electric Corp | Voltage detection circuit for auxiliary battery |
| CN102891923A (en) * | 2011-07-25 | 2013-01-23 | 深圳市福智软件技术有限公司 | Mobile terminal and power automatic switching method thereof |
| CN202856409U (en) * | 2012-10-10 | 2013-04-03 | 惠州市米琦通信设备有限公司 | Mobile phone boost charging wire and mobile phone charging system |
| CN103683481A (en) * | 2013-12-27 | 2014-03-26 | 无锡致新电子科技有限公司 | Non-loss monolithic integration power supply selective circuit |
| CN209786868U (en) * | 2019-04-29 | 2019-12-13 | 广州汽车集团股份有限公司 | backup battery hardware switching circuit |
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