CN107516936B - Direct current activestandby power supply switching circuit - Google Patents
Direct current activestandby power supply switching circuit Download PDFInfo
- Publication number
- CN107516936B CN107516936B CN201710802934.0A CN201710802934A CN107516936B CN 107516936 B CN107516936 B CN 107516936B CN 201710802934 A CN201710802934 A CN 201710802934A CN 107516936 B CN107516936 B CN 107516936B
- Authority
- CN
- China
- Prior art keywords
- power supply
- electrically connected
- circuit
- pole
- mos transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- Y04S20/20—End-user application control systems
Abstract
A direct current master and standby power supply switching circuit comprises a main power supply switch circuit and a standby power supply switch circuit; the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with a main power supply input positive electrode V1+ and a standby power supply input positive electrode V2+, and the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with a power supply switching dead zone delay circuit; the input end of the power supply switching trigger circuit is electrically connected with the main power supply input anode, and the output end of the power supply switching trigger circuit is electrically connected with the main power supply switch circuit and the standby power supply switch circuit respectively. The beneficial effect of this application is: the dead zone time delay function can not only realize seamless switching of the main power supply and the standby power supply, but also protect the load and prolong the service life; the MOSFET is used as a switching element, has small volume, small on-resistance and low power loss, and is beneficial to the integration and energy saving of a circuit; the power supply device can be widely applied to medical instruments and industrial equipment which need uninterrupted power supply.
Description
Technical Field
The application belongs to the technical field of power supplies, and particularly relates to a direct-current main/standby power supply switching circuit.
Background
In the electrical field, especially during the operation of equipment, it is often necessary to interrupt the power supply for various human or non-human reasons. But the running equipment may cause serious loss if the power supply is interrupted. This requires that the device be provided with a backup power supply and that the switching of the primary and backup power supplies be performed when the primary power supply is interrupted. The general power supply switching is realized by adopting devices such as a relay, a contactor and the like, the switching mode switching device has large volume and low switching speed, and the method can not be realized in the power supply switching of special conditions. There is a need to develop a new handover technique to meet the features such as seamless handover, small size, and wide application.
Disclosure of Invention
In view of this, the present application provides a dc primary/secondary power switching circuit, which not only has a small switching device size, but also can meet the requirement of seamless switching.
In order to solve the technical problem, the application discloses a direct-current main/standby power supply switching circuit, and the direct-current main/standby power supply switching circuit is implemented by adopting the following technical scheme.
A direct-current main and standby power supply switching circuit comprises a main power supply switching circuit, a standby power supply switching circuit, a power supply switching trigger circuit and a power supply switching dead zone delay circuit; the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with a main power supply input positive electrode V1+ and a standby power supply input positive electrode V2+, and the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with the power supply switching dead zone delay circuit; the input end of the power supply switching trigger circuit is electrically connected with the main power supply input anode, and the output end of the power supply switching trigger circuit is electrically connected with the main power supply switch circuit and the standby power supply switch circuit respectively.
Further, the main power switch circuit comprises a MOS transistor Q1 and a MOS transistor Q2; the main power input anode V1+ is electrically connected with the S pole of the MOS transistor Q1, and the main power input anode V1+ is connected with the G pole of the MOS transistor Q1 after being connected with the resistor R1 in series; the G pole of the MOS transistor Q1 is connected with a resistor R5 in series and then is electrically connected with the collector of a triode Q5; the D pole of the MOS transistor Q1 is electrically connected with the D pole of the MOS transistor Q2; the G pole of the MOS transistor Q2 is connected with a resistor R6 in series and then is electrically connected with the collector of a triode Q6; the bases of the triode Q5 and the triode Q6 are both electrically connected with a main power switch control signal SW _ DC, and the emitters of the triode Q5 and the triode Q6 are both electrically connected with GND; the main power switch control signal SW _ DC is connected with a pull-up resistor R11 and then is electrically connected with a DC power supply; a resistor R2 is connected between the S pole and the G pole of the MOS transistor Q2; and the S pole of the MOS transistor Q2 outputs the positive pole Vout of the power supply output.
Further, the MOS transistor Q1 and the MOS transistor Q2 are both P-channel MOSFETs; the transistor Q5 and the transistor Q6 are both NPN transistors.
Further, the standby power switch circuit comprises a MOS transistor Q3 and a MOS transistor Q4; the standby power supply input positive electrode V2+ is electrically connected with the S pole of the MOS transistor Q3, and the standby power supply input positive electrode V2+ is connected with the G pole of the MOS transistor Q3 after being connected with the resistor R3 in series; the G pole of the MOS transistor Q3 is connected with a resistor R7 in series and then is electrically connected with the collector of a triode Q7; the D pole of the MOS transistor Q3 is electrically connected with the D pole of the MOS transistor Q4; the G pole of the MOS transistor Q4 is connected with a resistor R8 in series and then is electrically connected with the collector of a triode Q8; bases of the triode Q7 and the triode Q8 are electrically connected with a standby power switch control signal SW _ BAT, and emitters of the triode Q7 and the triode Q8 are electrically connected with GND; the standby power switch control signal SW _ BAT is electrically connected with the DC power supply after being connected with the pull-up resistor R12; a resistor R4 is connected between the S pole and the G pole of the MOS transistor Q4; and the S pole of the MOS transistor Q4 outputs the positive pole Vout of the power supply output.
Further, the MOS transistor Q3 and the MOS transistor Q4 are both P-channel MOSFETs; the transistor Q7 and the transistor Q8 are both NPN transistors.
Further, the power supply switching dead-time delay circuit comprises a capacitor C1 and a diode D1; the cathode of the capacitor C1 is electrically connected with GND, and the anode of the capacitor C1 is electrically connected with the power output anode Vout after being connected in parallel with the diode D1 and the resistor R9; the anode of the diode D1 is electrically connected with the anode of the capacitor C1, and the cathode of the diode D1 is electrically connected with the power output anode Vout.
Further, the power supply switching trigger circuit comprises a sampling circuit and a comparison circuit; the input end of the sampling circuit is electrically connected with the positive electrode V1+ of the main power supply input, and the output end of the sampling circuit is electrically connected with the comparison circuit; the comparison circuit is provided with two output ends which are respectively and electrically connected with the input ends of the main power switch circuit and the standby power switch circuit.
Further, the sampling circuit comprises a resistor R13 and a circuit network; the main power input anode V1+ is connected with a resistor R13 and the circuit network in series and then is electrically connected with GND. The node between the resistor R13 and the circuit network is used as the output end of the sampling circuit and is electrically connected with the input end of the comparison circuit; the circuit network is embodied as a parallel network of a resistor R14, a capacitor C3, a capacitor C4 and a diode D2.
Further, the comparison circuit comprises a singlechip IC 1; the output end of the sampling circuit is electrically connected with an IO port of the singlechip IC 1; and the other two IO ports of the singlechip IC1 are used as output ends to respectively output the main power switch control signal SW _ DC and the standby power switch control signal SW _ BAT.
Compared with the prior art, the application can obtain the following technical effects: the dead zone time delay function can not only realize seamless switching of the main power supply and the standby power supply, but also protect the load and prolong the service life; the MOSFET is used as a switching element, has small volume, small on-resistance and low power loss, and is beneficial to the integration and energy saving of a circuit; the power supply device can be widely applied to medical instruments and industrial equipment which need uninterrupted power supply.
Of course, it is not necessary for any one product to achieve all of the above-described technical effects simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is an overall schematic block diagram of a switching circuit of the present application.
Fig. 2 is a schematic diagram of a power switching circuit of the main power supply of the present application.
Fig. 3 is a schematic diagram of a power switching circuit of the backup power supply of the present application.
Fig. 4 is a schematic diagram of a power supply switching dead-time delay circuit according to the present application.
Fig. 5 is a schematic diagram of a power switching trigger circuit according to the present application.
Wherein, in the figure:
v1 +: a main power input anode;
v2 +: the standby power supply inputs the positive pole;
SW _ DC: a main power switch control signal;
SW _ BAT: a standby power switch control signal;
vout: and the power supply outputs a positive pole.
Detailed Description
Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
As shown in fig. 1, a dc main/standby power switching circuit includes a main power switch circuit, a standby power switch circuit, a power switching trigger circuit, and a power switching dead-zone delay circuit. The main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with the main power supply and the standby power supply, and the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with the power supply switching dead zone delay circuit. The input end of the power supply switching trigger circuit is electrically connected with a main power supply, and the output end of the power supply switching trigger circuit is electrically connected with the main power supply switch circuit and the standby power supply switch circuit respectively.
As shown in fig. 2, the main power switch circuit includes two MOS transistors Q1 and Q2, and each of Q1 and Q2 employs a P-channel MOSFET. The main power input positive electrode V1+ is electrically connected to the S-pole of the MOS transistor Q1, and V1+ is connected in series with the resistor R1 and then to the G-pole of the MOS transistor Q1. The G pole of the MOS transistor Q1 is connected with a resistor R5 in series and then is electrically connected with the collector of a triode Q5. The D pole of the MOS transistor Q1 is electrically connected to the D pole of the MOS transistor Q2. The G pole of the MOS transistor Q2 is connected with a resistor R6 in series and then is electrically connected with the collector of a triode Q6. The base electrodes of the transistor Q5 and the transistor Q6 are both electrically connected with a main power switch control signal SW _ DC, and the emitter electrodes are both electrically connected with GND. The main power switch control signal SW _ DC is connected to the pull-up resistor R11 and then electrically connected to the DC5V power supply. The resistor R2 is connected between the S pole and the G pole of the MOS transistor Q2. The S-pole of the MOS transistor Q2 outputs the power supply output positive pole Vout.
When the main power switch control signal SW _ DC is at a high level, the transistors Q5 and Q6 are both turned on, the voltages of the G-poles of the MOS transistors Q1 and Q2 are set high, Q1 and Q2 are turned on, so that the V1+ and Vout are turned on, and the main power supply supplies power. On the contrary, V1+ and Vout are disconnected, and the main power supply stops supplying power.
As shown in fig. 3, the standby power switch circuit includes two MOS transistors Q3 and Q4, and each of Q3 and Q4 employs a P-channel MOSFET. The standby power supply input positive electrode V2+ is electrically connected with the S pole of the MOS transistor Q3, and the V2+ is connected with the G pole of the MOS transistor Q3 after being connected with the resistor R3 in series. The G pole of the MOS transistor Q3 is connected with a resistor R7 in series and then is electrically connected with the collector of a triode Q7. The D pole of the MOS transistor Q3 is electrically connected to the D pole of the MOS transistor Q4. The G pole of the MOS transistor Q4 is connected with a resistor R8 in series and then is electrically connected with the collector of a triode Q8. The base electrodes of the triode Q7 and the triode Q8 are electrically connected with a standby power switch control signal SW _ BAT, and the emitter electrodes are electrically connected with GND. The standby power switch control signal SW _ BAT is electrically connected to the DC5V power supply after connecting to the pull-up resistor R12. The resistor R4 is connected between the S pole and the G pole of the MOS transistor Q4. The S-pole of the MOS transistor Q4 outputs the power supply output positive pole Vout.
The triodes Q1, Q2, Q3 and Q4 are NPN triodes.
When the standby power switch control signal SW _ BAT is at a high level, the triodes Q7 and Q8 are both turned on, the voltages of the G-poles of the MOS transistors Q3 and Q4 are set high, the transistors Q3 and Q4 are turned on, the conduction of V2+ and Vout is realized, and the standby power supply supplies power. On the contrary, the voltage between V2+ and Vout is cut off, and the standby power supply stops supplying power.
As shown in fig. 4, the power supply switching dead time delay circuit includes a capacitor C1 and a diode D1. The cathode of the capacitor C1 is electrically connected with GND, and the anode is electrically connected with the power output anode Vout after being connected with the diode D1 and the resistor R9 in parallel. The anode of the diode D1 is electrically connected to the anode of the capacitor C1, and the cathode is electrically connected to the power output anode Vout.
As shown in fig. 5, the power supply switching trigger circuit includes a sampling circuit and a comparison circuit, wherein an input end of the sampling circuit is electrically connected with the main power supply input anode V1+, and an output end of the sampling circuit is electrically connected with the comparison circuit. The sampling circuit transmits the collected sampling voltage to the comparison circuit for comparison. The comparison circuit is realized by a singlechip IC 1. The voltage signal transmitted by the sampling circuit is compared with the internal reference voltage, and a power switch control signal is output.
The sampling circuit comprises a resistor R13, a resistor R14, a capacitor C3, a capacitor C4 and a diode D2. The main power input anode V1+ is connected with a resistor R13 and the circuit network in series and then is electrically connected with GND. And a node between the resistor R13 and the circuit network is used as the output end of the sampling circuit and is electrically connected with the singlechip IC1 of the comparison circuit. The circuit network is embodied as a parallel network of a resistor R14, a capacitor C3, a capacitor C4 and a diode D2. The comparison circuit comprises a single chip microcomputer IC1, the single chip microcomputer IC1 selects PIC16F1783, the PIC16F1783 single chip microcomputer is internally provided with a comparator and a 2.048V reference voltage, and the comparison circuit can be used for comparing an external pressure value signal with the reference voltage and outputting different level signals according to a comparison result. The output end of the sampling circuit is electrically connected with the IO port of the singlechip IC1, two IO ports used as output of the singlechip IC1 are respectively and electrically connected with the input ends of the main power switch circuit and the standby power switch circuit, namely, the two IO ports of the singlechip IC1 are respectively and electrically connected with the input ends of the main power switch circuit and the standby power switch circuit.
The sampling circuit divides and samples the initial main power supply voltage signal and transmits the sampling signal to the singlechip IC 1. The built-in comparator of the singlechip IC1 compares the main power supply voltage with the internal reference voltage, when the input voltage is lower than the reference voltage value, two output ends of the singlechip IC1 output low level, so that the main power supply switch and the standby power supply switch are closed, 0.5-2 mS delay is realized, the standby power supply switch control signal SW _ BAT is set high, the standby power supply switch is opened, and the standby power supply is used for supplying power. And finishing the replacement of the main power supply and the standby power supply. The time delay is 0.5-2 mS, the time delay can be realized by adopting a timer in a single chip microcomputer or a single chip microcomputer program, the single chip microcomputer program for timing is used in most software programs, and the method belongs to the prior art. In practice, one delay function is mainly used and is cycled, and the cycling times are set to be different according to different delay times. And will not be described in detail herein.
In the time of delay, the power supply switches the dead zone delay circuit to supply power. The capacitor C1 in the dead time delay circuit can be charged when the power supply is powered. When the power supply output is electrified, the current is limited by the resistor R9 to charge the capacitor C1 until the voltage across the capacitor C1 is equal to the power supply output voltage. During the duration of the power supply, the capacitor C1 may be considered to be approximately not discharging due to the circuit configuration of the dead time delay circuit. When the main power supply is switched, the main power supply switch is turned off at the same time, no power is supplied, the capacitor C1 starts to discharge, and the load is supplied with power through the diode D1. Until the standby power supply is turned on, the capacitor C1 stops discharging and starts charging, and the next cycle is entered. Thereby achieving uninterrupted power supply. The parameters of the capacitor C1 are matched with the delay time, that is, the electricity storage capacity of the capacitor C1 is required to be matched with the power consumption of the load in the delay time, so that the situation that the power supply still does not start to supply power after the capacitor C1 finishes discharging is avoided. Normally, the capacitor C1 needs to be rated VC higher than the output supply voltage (Vout)2V, and has a capacity of 350 farads or more. The super capacitor can realize stable power supply of heavy-load equipment.
The reason why the standby power supply is started after the time delay is 0.5-2 mS is that when the main power supply and the standby power supply are switched, the power supply voltage of the main power supply is already reduced to a reference value, and the direct switching can cause instantaneous voltage change and is unfavorable for the stability of a load. The power supply is started after a certain time delay, so that the adaptive time can be given to the load, and the service life of the load is prolonged.
The beneficial effect of this application is: the dead zone time delay function can not only realize seamless switching of the main power supply and the standby power supply, but also protect the load and prolong the service life; the MOSFET is used as a switching element, has small volume, small on-resistance and low power loss, and is beneficial to the integration and energy saving of a circuit; the power supply device can be widely applied to medical instruments and industrial equipment which need uninterrupted power supply.
The dc main/standby power switching circuit provided in the embodiment of the present application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (1)
1. A direct current activestandby power supply switching circuit which characterized in that: the power supply switching circuit comprises a main power supply switching circuit, a standby power supply switching circuit, a power supply switching trigger circuit and a power supply switching dead zone time delay circuit; the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with a main power supply input positive electrode V1+ and a standby power supply input positive electrode V2+, and the main power supply switch circuit and the standby power supply switch circuit are respectively and electrically connected with the power supply switching dead zone delay circuit; the input end of the power supply switching trigger circuit is electrically connected with the main power supply input positive electrode, and the output end of the power supply switching trigger circuit is electrically connected with the main power supply switching circuit and the standby power supply switching circuit respectively; the main power switch circuit comprises a MOS tube Q1 and a MOS tube Q2; the main power input anode V1+ is electrically connected with the S pole of the MOS transistor Q1, and the main power input anode V1+ is connected with the G pole of the MOS transistor Q1 after being connected with the resistor R1 in series; the G pole of the MOS transistor Q1 is connected with a resistor R5 in series and then is electrically connected with the collector of a triode Q5; the D pole of the MOS transistor Q1 is electrically connected with the D pole of the MOS transistor Q2; the G pole of the MOS transistor Q2 is connected with a resistor R6 in series and then is electrically connected with the collector of a triode Q6; the bases of the triode Q5 and the triode Q6 are both electrically connected with a main power switch control signal SW _ DC, and the emitters of the triode Q5 and the triode Q6 are both electrically connected with GND; the main power switch control signal SW _ DC is connected with a pull-up resistor R11 and then is electrically connected with a DC power supply; a resistor R2 is connected between the S pole and the G pole of the MOS transistor Q2; the S pole of the MOS tube Q2 outputs the positive pole Vout of the power supply; the MOS transistor Q1 and the MOS transistor Q2 are both P-channel MOSFETs; the transistor Q5 and the transistor Q6 are both NPN transistors; the standby power supply switching circuit comprises a MOS transistor Q3 and a MOS transistor Q4; the standby power supply input positive electrode V2+ is electrically connected with the S pole of the MOS transistor Q3, and the standby power supply input positive electrode V2+ is connected with the G pole of the MOS transistor Q3 after being connected with the resistor R3 in series; the G pole of the MOS transistor Q3 is connected with a resistor R7 in series and then is electrically connected with the collector of a triode Q7; the D pole of the MOS transistor Q3 is electrically connected with the D pole of the MOS transistor Q4; the G pole of the MOS transistor Q4 is connected with a resistor R8 in series and then is electrically connected with the collector of a triode Q8; bases of the triode Q7 and the triode Q8 are electrically connected with a standby power switch control signal SW _ BAT, and emitters of the triode Q7 and the triode Q8 are electrically connected with GND; the standby power switch control signal SW _ BAT is electrically connected with the DC power supply after being connected with the pull-up resistor R12; a resistor R4 is connected between the S pole and the G pole of the MOS transistor Q4; the S pole of the MOS tube Q4 outputs the positive pole Vout of the power supply; the MOS transistor Q3 and the MOS transistor Q4 are both P-channel MOSFETs; the transistor Q7 and the transistor Q8 are both NPN transistors; the power supply switching dead-time delay circuit comprises a capacitor C1 and a diode D1; the cathode of the capacitor C1 is electrically connected with GND, and the anode of the capacitor C1 is electrically connected with the power output anode Vout after being connected in parallel with the diode D1 and the resistor R9; the anode of the diode D1 is electrically connected with the anode of the capacitor C1, and the cathode of the diode D1 is electrically connected with the power output anode Vout; the power supply switching trigger circuit comprises a sampling circuit and a comparison circuit; the input end of the sampling circuit is electrically connected with the positive electrode V1+ of the main power supply input, and the output end of the sampling circuit is electrically connected with the comparison circuit; the comparison circuit is provided with two output ends which are respectively and electrically connected with the input ends of the main power switch circuit and the standby power switch circuit; the sampling circuit comprises a resistor R13 and a circuit network; the main power input anode V1+ is connected with a resistor R13 in series and the circuit network and then is electrically connected with GND; the node between the resistor R13 and the circuit network is used as the output end of the sampling circuit and is electrically connected with the input end of the comparison circuit; the circuit network is specifically a parallel network of a resistor R14, a capacitor C3, a capacitor C4 and a diode D2; the comparison circuit comprises a singlechip IC 1; the output end of the sampling circuit is electrically connected with an IO port of the singlechip IC 1; and the other two IO ports of the singlechip IC1 are used as output ends to respectively output the main power switch control signal SW _ DC and the standby power switch control signal SW _ BAT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710802934.0A CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710802934.0A CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107516936A CN107516936A (en) | 2017-12-26 |
| CN107516936B true CN107516936B (en) | 2022-03-22 |
Family
ID=60725224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710802934.0A Active CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107516936B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633291B (en) * | 2018-12-20 | 2020-11-27 | 兰州空间技术物理研究所 | Bias current main backup switching circuit in space electric field detection system |
| CN110994774B (en) * | 2019-11-11 | 2022-03-08 | 广州亚美智造科技有限公司 | Power supply switching circuit |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991004601A1 (en) * | 1989-09-20 | 1991-04-04 | Yard Jeffrey K | Automatic control circuit for backup voltage supply |
| US5142165A (en) * | 1990-08-31 | 1992-08-25 | International Business Machines Corporation | Power off/on delay circuit to prevent lockout |
| JP2005312218A (en) * | 2004-04-22 | 2005-11-04 | Nec Electronics Corp | Power supply switching circuit and portable electronic equipment |
| CN100459369C (en) * | 2006-05-29 | 2009-02-04 | 华为技术有限公司 | Controller for switching main power supply |
| CN101136558B (en) * | 2006-09-02 | 2010-08-18 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and switch circuit, switch method of main power source and backup battery |
| CN102447302A (en) * | 2010-09-30 | 2012-05-09 | 苏州捷泰科信息技术有限公司 | Main-standby power supply switching control method and device |
| CN202282637U (en) * | 2011-07-15 | 2012-06-20 | 深圳麦格米特电气股份有限公司 | Smooth power supply cell switching circuit |
| TW201414156A (en) * | 2012-09-17 | 2014-04-01 | Fsp Technology Inc | Power supply apparatus with power backup mechanism |
| CN103001315B (en) * | 2012-12-26 | 2016-12-28 | 上海斐讯数据通信技术有限公司 | A kind of power supply switch circuit |
| CN104184205A (en) * | 2013-05-23 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Power switching circuit and lighting equipment |
| JP6135333B2 (en) * | 2013-06-28 | 2017-05-31 | ソニー株式会社 | Power supply switching circuit, electronic device, and control method for power supply switching circuit |
| CN204721079U (en) * | 2015-04-20 | 2015-10-21 | 北京航天自动控制研究所 | Dual-power automatic switching and charging circuit |
| CN106130100A (en) * | 2016-07-01 | 2016-11-16 | 北京云迹科技有限公司 | Controlled battery charger and charger |
| CN106374583B (en) * | 2016-10-31 | 2019-08-20 | 河南省电子规划研究院有限责任公司 | Power supply time delay conversion circuit |
-
2017
- 2017-09-08 CN CN201710802934.0A patent/CN107516936B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107516936A (en) | 2017-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11641881B2 (en) | Electronic cigarette and power supply structure thereof | |
| JP2020537865A (en) | Charging device and terminal | |
| CN109327044B (en) | Power conversion circuit, inverter circuit, photovoltaic power generation system and control method thereof | |
| US20230097692A1 (en) | Switched Capacitor Converter Mode Transition Control Method | |
| CN107516936B (en) | Direct current activestandby power supply switching circuit | |
| US7816902B2 (en) | Integrated circuit including a controller for regulating a power supply | |
| WO2017020782A1 (en) | Battery charging and discharging control circuit and battery charging and discharging system | |
| CN105981128A (en) | Latching-relay drive circuit | |
| CN105162313A (en) | Flyback switching power supply | |
| CN110693401A (en) | Cleaning robot | |
| TW201836230A (en) | Charging circuit and control method thereof | |
| CN112886640A (en) | Current limiting circuit and energy storage system | |
| CN104348460B (en) | Circuit device for operating electronic switch and method | |
| CN115632176B (en) | Battery management circuit and battery management system | |
| JP6412757B2 (en) | Power supply | |
| CN108963999A (en) | A kind of Inrush current restraining device | |
| CN112635857B (en) | Battery pack, battery protection chip and electronic product | |
| CN210640722U (en) | Battery switch circuit and power supply management system comprising same | |
| CN104333113A (en) | Power circuit | |
| CN107528368A (en) | A kind of battery power discharge control circuit | |
| CN112635858A (en) | Battery pack, battery protection chip and electronic product | |
| JP2018133854A (en) | Voltage non-drop type power supply circuit and application circuit thereof | |
| CN107359785B (en) | Switching power supply and starting circuit thereof | |
| CN214506569U (en) | Current limiting circuit and energy storage system | |
| CN217824723U (en) | Circuit for inhibiting surge current of switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |