CN210431004U - AC/DC double-power-supply type automatic switching circuit - Google Patents
AC/DC double-power-supply type automatic switching circuit Download PDFInfo
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- CN210431004U CN210431004U CN201921096724.5U CN201921096724U CN210431004U CN 210431004 U CN210431004 U CN 210431004U CN 201921096724 U CN201921096724 U CN 201921096724U CN 210431004 U CN210431004 U CN 210431004U
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- switch
- power supply
- main power
- triode
- mos tube
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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
- Y04S20/20—End-user application control systems
Abstract
An alternating current-direct current double-power-supply type automatic switching circuit comprises a main power supply, a standby power supply, a voltage type detector, a linked switch, a main power supply switch and a standby power supply switch, wherein the linked switch is a double-pole switch, one switch part of the linked switch is arranged on the main power supply circuit, the other switch part of the linked switch is arranged on the standby power supply circuit, and one of the main power supply switch and the standby battery switch is selected to be turned on; the positive and negative poles of the main power supply are respectively used as the input quantity of the voltage type detector, the main power supply switch and the standby power supply switch respectively comprise a respective MOS tube and a triode, and the MOS tube and the triode form a switch circuit. The circuit has the advantages of reliable working performance, low power consumption of the switching circuit, simple circuit, small printed board area and low cost.
Description
Technical Field
The utility model relates to an automatic switching circuit.
Background
The background art is provided only to aid understanding of the technical contents and is not prior art.
With the rapid development of urban science and technology and economy, more and more users need continuous and reliable power supply, especially for some important customers such as airports, banks, communication and the like, once the power supply is interrupted, great loss is caused, and the power supply mode of a single power supply has great defects. At present, many power devices put higher demands on the reliability and stability of power supply, and two (even multiple) power supplies are required to ensure the reliability of power supply. Two way power switching devices commonly used at present adopt the mode that the double diode is parallelly connected or the mode that the relay switches usually, and these two kinds of modes all have certain drawback, not only can not guarantee the reliability of power supply but also can cause the emergence of power failure, and the circuit that is used for switching between main power supply and stand-by power supply among the prior art roughly divide into two kinds: one is to use two diodes to realize the switching circuit of the main power supply and the standby power supply, and because the diodes have certain voltage drop, the loss on power is large, the heating is serious and the efficiency is low; the other is to use two PMOS tubes to realize the switching circuit of the main power supply and the standby power supply, and has the defects of higher cost, complex structure of a voltage stabilizing and rectifying circuit, large occupied space of hardware and inconvenient maintenance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at carrying out automatic switch-over function between interchange (commercial power) and direct current (backup battery), in alternating current-direct current power automatic switch-over circuit, should be with the alternating current priority, the main battery is reserve, at the work of the incessant user of automatic switch-over in-process.
The utility model discloses a following technical scheme realizes:
the utility model provides a two power supply type automatic switch-over circuit of alternating current-direct current, includes main power supply, stand-by power supply, voltage type detector, gang switch, main power switch and stand-by power switch, its characterized in that: the linkage switch is a double-pole switch, one switch part of the linkage switch is arranged on the main power circuit, the other switch part of the linkage switch is arranged on the standby power circuit, and the main power switch and the standby battery switch are alternatively switched on; the positive and negative poles of the main power supply are respectively used as the input quantity of the voltage type detector, the main power supply switch and the standby power supply switch respectively comprise a respective MOS tube and a triode, and the MOS tube and the triode form a switch circuit.
Preferably, the main switching power supply comprises a first MOS transistor and a second triode, a base of the second triode is connected with an output end of the voltage type detector, an emitter of the second triode is connected with the main power supply, a collector of the second triode is connected with the first MOS transistor, a drain of the first MOS transistor is connected with the main power supply, a grid of the first MOS transistor is grounded, and a first light emitting diode is arranged between the grid and the ground.
Preferably, the standby power switch comprises a third MOS transistor and a fourth transistor, a base of the fourth transistor is connected to the main power supply, and a second light emitting diode is disposed between the fourth transistor and the main power supply.
Preferably, a schottky diode is arranged between the grid electrode and the drain electrode of the first MOS transistor and the third MOS transistor, the anode of the schottky diode is connected with the drain electrode, and the cathode of the schottky diode is connected with the grid electrode.
The utility model discloses a concrete theory of operation as follows: the specific working principle is as follows: after the double-pole single-throw switch S is closed, if the voltage of a main power supply is higher than Vth, the CL type voltage detector outputs high level, the high level enables VT2 to be conducted, the grid G of VT1 is close to the ground level, and a proper voltage enables VT1 to be conducted to supply power to a load; at the same time, the high level turns on VT4, the voltage on R4 approaches the voltage of the backup battery, the-Vgs of VT2 is approximately equal to 0V, VT2 is cut off, when the main power supply is lost and the voltage drop is below Vth, the CL type voltage detector outputs low level, the low level turns off VT2 and VT4, the VT2 is cut off, VT1 is cut off, VT4 is cut off, R4 is grounded, and VT3 is turned on, the backup battery supplies power to the load. This switching is fully automatic and the switching time is less than 10us, while in order to prevent affecting the load operation at the switching instant, the load is now supplied by C1.
As shown in fig. 1, the first MOS transistor VT1 and the third MOS transistor VT3 are both power MOS transistors with double P-channels, and the second transistor VT2 and the fourth transistor VT4 are both transistors.
The voltage of the backup battery is also applied to the input end of the voltage detector through the diode of the VT1, which causes the CL type voltage detector to output a high level erroneously, thus destroying the switching operation, therefore, the circuit adds a Schottky diode after the VT1 as a blocking diode.
LED1 is an indicator light powered by AC power supply, and LED2 is a backup battery with voltage lower than Vth-A time indicator (when the LED2 is on, the standby battery is not powered, and the standby battery should be replaced timely).
The 220V mains supply outputs stable direct current voltage after passing through the isolated AC/DC converter, the electronic switch VT3 is switched off when the mains supply supplies power, and the output voltage is required to be stable when the standby battery supplies power, so that a Low Dropout (LDO) linear voltage regulator is added in the circuit for supplying power.
The automatic switching circuit has very small power consumption, for example, the power consumption of the voltage detector is 1-3.6 muA; VT2, VT4 consume about 50 μ A when turned on; the power consumption of the LED is only about 3mA, and the LED lamp is in accordance with the energy-saving concept.
The utility model has the advantages that:
the circuit has the advantages of reliable working performance, low power consumption of the switching circuit, simple circuit, small printed board area occupation and low cost.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
An alternating current-direct current double-power-supply type automatic switching circuit comprises a main power supply A, a standby power supply B, a voltage type detector CL, a linked switch, a main power supply switch C and a standby power supply switch D, wherein the linked switch is a double-pole switch, one switch part of the linked switch is arranged on the main power supply circuit, the other switch part of the linked switch is arranged on the standby power supply circuit, and one of the main power supply switch and the standby battery switch is selected to be turned on; the positive and negative poles of the main power supply are respectively used as the input quantity of the voltage type detector, the main power supply switch C and the standby power supply switch D respectively comprise MOS tubes VT1 and VT3 and triodes VT2 and VT4, and the MOS tubes and the triodes form a switch circuit.
The main switching power supply comprises a first MOS tube VT1 and a second triode VT2, the base electrode of the second triode VT2 is connected with the output end of the voltage type detector CL, the emitter electrode of the second triode VT2 is connected with a main power supply A, the collector electrode of the second triode VT2 is connected with the first MOS tube, the drain electrode of the first MOS tube VT1 is connected with the main power supply A, the grid electrode of the first MOS tube VT1 is grounded, and a first light-emitting diode LED1 is arranged between the grid electrode and the ground.
The standby power switch comprises a third MOS transistor VT3 and a fourth triode VT4, the base electrode of the fourth triode VT4 is connected with the main power supply, and a second light-emitting diode LED2 is arranged between the fourth triode VT4 and the main power supply A.
A Schottky diode is arranged between the grid electrode and the drain electrode of the first MOS transistor VT1 and the third MOS transistor VT3, the anode and the drain electrode of the Schottky diode are connected, and the cathode of the Schottky diode is connected with the grid electrode.
The utility model discloses a concrete theory of operation as follows: the specific working principle is as follows: after the double-pole single-throw switch S is closed, if the voltage of a main power supply is higher than Vth, the CL type voltage detector outputs high level, the high level enables VT2 to be conducted, the grid G of VT1 is close to the ground level, and a proper voltage enables VT1 to be conducted to supply power to a load; at the same time, the high level turns on VT4, the voltage on R4 approaches the voltage of the backup battery, the-Vgs of VT2 is approximately equal to 0V, VT2 is cut off, when the main power supply is lost and the voltage drop is below Vth, the CL type voltage detector outputs low level, the low level turns off VT2 and VT4, the VT2 is cut off, VT1 is cut off, VT4 is cut off, R4 is grounded, and VT3 is turned on, the backup battery supplies power to the load. This switching is fully automatic and the switching time is less than 10us, while in order to prevent affecting the load operation at the switching instant, the load is now supplied by C1.
As shown in fig. 1, the first MOS transistor VT1 and the third MOS transistor VT3 are both power MOS transistors with double P-channels, and the second transistor VT2 and the fourth transistor VT4 are both transistors.
The voltage of the backup battery is also applied to the input end of the voltage detector through the diode of the VT1, which causes the CL type voltage detector to output a high level erroneously, thus destroying the switching operation, therefore, the circuit adds a Schottky diode after the VT1 as a blocking diode.
LED1 is an indicator light powered by AC power supply, and LED2 is a backup battery with voltage lower than Vth-A time indicator (when the LED2 is on, the standby battery is not powered, and the standby battery should be replaced timely).
The 220V mains supply outputs stable direct current voltage after passing through the isolated AC/DC converter, the electronic switch VT3 is switched off when the mains supply supplies power, and the output voltage is required to be stable when the standby battery supplies power, so that a Low Dropout (LDO) linear voltage regulator is added in the circuit for supplying power.
The automatic switching circuit has very small power consumption, for example, the power consumption of the voltage detector is 1-3.6 muA; VT2, VT4 consume about 50 μ A when turned on; the power consumption of the LED is only about 3mA, and the LED lamp is in accordance with the energy-saving concept.
Claims (4)
1. The utility model provides a two power supply type automatic switch-over circuit of alternating current-direct current, includes main power supply, stand-by power supply, voltage type detector, gang switch, main power switch and stand-by power switch, its characterized in that: the linkage switch is a double-pole switch, one switch part of the linkage switch is arranged on the main power circuit, the other switch part of the linkage switch is arranged on the standby power circuit, and the main power switch and the standby battery switch are alternatively switched on; the positive and negative poles of the main power supply are respectively used as the input quantity of the voltage type detector, the main power supply switch and the standby power supply switch respectively comprise a respective MOS tube and a triode, and the MOS tube and the triode form a switch circuit.
2. The ac/dc dual-power-supply type automatic switching circuit according to claim 1, wherein: the main switch power supply comprises a first MOS tube and a second triode, the base of the second triode is connected with the output end of the voltage type detector, the emitting electrode of the second triode is connected with the main power supply, the collecting electrode of the second triode is connected with the first MOS tube, the drain electrode of the first MOS tube is connected with the main power supply, the grid electrode of the first MOS tube is grounded, and a first light emitting diode is arranged between the grid electrode and the ground.
3. The ac/dc dual-power-supply type automatic switching circuit according to claim 1, wherein: the standby power switch comprises a third MOS tube and a fourth triode, the base electrode of the fourth triode is connected with the main power supply, and a second light-emitting diode is arranged between the fourth triode and the main power supply.
4. The ac/dc dual power type automatic switching circuit according to claim 2 or 3, wherein: a Schottky diode is arranged between the grid electrode and the drain electrode of the first MOS tube and the third MOS tube, the anode of the Schottky diode is connected with the drain electrode, and the cathode of the Schottky diode is connected with the grid electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096724.5U CN210431004U (en) | 2019-07-12 | 2019-07-12 | AC/DC double-power-supply type automatic switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096724.5U CN210431004U (en) | 2019-07-12 | 2019-07-12 | AC/DC double-power-supply type automatic switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210431004U true CN210431004U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921096724.5U Expired - Fee Related CN210431004U (en) | 2019-07-12 | 2019-07-12 | AC/DC double-power-supply type automatic switching circuit |
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| CN (1) | CN210431004U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003364A (en) * | 2020-08-14 | 2020-11-27 | 北京浪潮数据技术有限公司 | Standby power module and server power supply |
-
2019
- 2019-07-12 CN CN201921096724.5U patent/CN210431004U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003364A (en) * | 2020-08-14 | 2020-11-27 | 北京浪潮数据技术有限公司 | Standby power module and server power supply |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200428 Termination date: 20210712 |