CN109412255A - A kind of double loop power supply switching circuit of low-loss high reliability - Google Patents
A kind of double loop power supply switching circuit of low-loss high reliability Download PDFInfo
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- CN109412255A CN109412255A CN201811227995.XA CN201811227995A CN109412255A CN 109412255 A CN109412255 A CN 109412255A CN 201811227995 A CN201811227995 A CN 201811227995A CN 109412255 A CN109412255 A CN 109412255A
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- diode
- pmos tube
- power supply
- npn type
- switching circuit
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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
-
- 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
Abstract
A kind of double loop power supply switching circuit of low-loss high reliability, it includes AC-DC converting unit, DC-DC converting unit, battery component, battery charging and discharging administrative unit, it is characterized by also including the comparators with two complementary outputs, first diode, second diode, third diode, 4th diode, first PMOS tube, second PMOS tube, third PMOS tube, the output end of the DC-DC converting unit respectively with the anode of first diode, the drain electrode of first PMOS tube, the anode of 4th diode is electrically connected, the battery charging and discharging administrative unit output respectively with the anode of battery component, the source electrode of second PMOS tube is electrically connected, the cathode of the battery component is grounded.The reliability that the double loop power supply switching circuit of the low-loss high reliability can combine power utilization efficiency, battery capacity maximally utilizes and switch.
Description
Technical field
The present invention relates to double loop power supply switching circuit technical fields, and in particular to a kind of two-way electricity of low-loss high reliability
Source switching circuit.
Background technique
For with the battery-powered system of standby electricity, power unit can all have a double loop power supply switching circuit, by the electricity
The power supply of road decision systems comes from alternating current or reserve battery, such as the 5V power-supply system of concentrator just uses so one
A functional circuit.
The double loop power supply switching circuit of the existing 5V power-supply system applied to concentrator is as shown in Figure 1, D1 ', D2 ' in figure
It is Schottky diode, Q1 ' is PMOS, and J1 ' is NPN triode, and U1 ' is comparator；The circuit is unidirectionally led using diode
Logical characteristic exports low electricity when the output voltage V12V that U1 ' determines AC-DC converting unit is higher than setting voltage VREF
It is flat, Q1 ' cut-off, the output V5.3V of the power supply of rear end voltage V5V from DC-DC converting unit；When to determine V12V low by U1 '
When setting voltage VREF, high level is exported, Q1 ' opening, the power supply of rear end voltage V5V is from DC-DC converting unit
Output and battery component output the two in voltage it is higher that all the way.The circuit is very simple, but due to diode
There are forward voltage drops, even with the Schottky diode having compared with low forward voltage drop, under low current one (within 0.1A)
As also have the pressure drop of 0.3V or so, if circuital current is larger (such as 3A), Schottky diode is general at room temperature
The pressure drop for having 0.4V or more is at least lost if being realized double loop power supply switching by the way of diode in 5V system
5% efficiency, therefore the circuit power utilization efficiency is very low.
Another kind is applied to the double loop power supply switching circuit of the 5V power-supply system of concentrator as shown in Fig. 2, Q2 ', Q3 ' in figure
It is PMOS；J2 ', J3 ' are NPN triodes；U2 ' is the comparator for having complementary output, and circuit field-effect tube Q2 ', Q3 ' take
It can accomplish within 30m Ω for diode since the bulk resistor of field-effect tube is smaller, therefore the output of DC-DC converting unit can
To be reduced to 5.1V, still may insure through Q2 ' voltage later in 5V or so.But the circuit still has following lack
Fall into: 1, the charging voltage of battery component has to be lower than the output voltage 5.1V of DC-DC converting unit, leads to the voltage of battery component
Capacity cannot maximally utilize；2, when generating power supply switching action, Q2 ' and Q3 ' are simultaneously operations, will necessarily there is one section
The very short time, during this period of time Q2 ' and Q3 ' are all in opening state, so that the output for DC-DC converting unit occur passes through
The output capacitance that the backward battery component charging of Q2 ' and Q3 ' or battery component pass through the backward DC-DC converting unit of Q2 ' and Q3 '
Charging, or even by the parasitic diode of the field-effect tube inside DC-DC converting unit to the output capacitance of AC-DC converting unit
Charging.
Therefore existing double loop power supply switching circuit is difficult to combine power utilization efficiency, battery capacity maximization benefit
With and switching integrity problem.
Summary of the invention
The technical problem to be solved by the present invention is providing, a kind of to combine power utilization efficiency, battery capacity maximum
Change the double loop power supply switching circuit of the low-loss high reliability of the reliability of utilization and switching.
The technical solution of the invention is as follows: a kind of double loop power supply switching circuit of low-loss high reliability, it includes AC-
DC converting unit, DC-DC converting unit, battery component, battery charging and discharging administrative unit, it is characterised in that: further include having two
Comparator, first diode, the second diode, third diode, the 4th diode, the first PMOS tube, second of complementary output
PMOS tube, third PMOS tube, the first NPN type triode, the second NPN type triode, third NPN type triode, first resistor,
The AC input of two resistance, 3rd resistor, the 4th resistance, the 5th resistance, the AC-DC converting unit is electrically connected with alternating current, institute
State the DC output end of AC-DC converting unit respectively with the input terminal of DC-DC converting unit, the non-inverting input terminal of comparator, battery
The input terminal of management of charging and discharging unit is electrically connected, the output end of the DC-DC converting unit respectively with the anode of first diode,
The drain electrode of first PMOS tube, the 4th diode anode electrical connection, the output of the battery charging and discharging administrative unit respectively with electricity
The source electrode electrical connection of the anode of pond component, the second PMOS tube, the cathode ground connection of the battery component, the leakage of second PMOS tube
Pole is electrically connected with the drain electrode of the anode of the second diode, the anode of third diode, third PMOS tube respectively, the one or two pole
The cathode of pipe, the source electrode of the first PMOS tube, the cathode of third diode, third PMOS tube source electrode be electrically connected with together as
The grid of rear end power supply, first PMOS tube is electrically connected by first resistor with the collector of the first NPN type triode, described
The grid of first PMOS tube is also electrically connected with the cathode of the second diode, and the in-phase output end of the comparator passes through second resistance
Be electrically connected with the base stage of the first NPN type triode, the emitter of first NPN type triode ground connection, the comparator it is anti-
Phase output terminal is electrically connected by the 4th resistance with the base stage of the second NPN type triode, and the reversed-phase output of the comparator is also logical
It crosses the 5th resistance to be electrically connected with the base stage of third NPN type triode, the collector and the 2nd PMOS of second NPN type triode
The grid of pipe is electrically connected, and the collector of the third NPN type triode is electrically connected by the grid of 3rd resistor and third PMOS tube
It connects, the grid of the third PMOS tube is electrically connected with the cathode of the 4th diode, second NPN type triode and the 3rd NPN
The emitter of type triode is grounded.
The working principle of the double loop power supply switching circuit of low-loss high reliability of the present invention is as follows:
When mains-supplied is normal, the output voltage V12V of AC-DC converting unit is higher than the reference voltage VREF of comparator,
The in-phase output end of comparator exports high level, the first NPN type triode conducting, so that the grid source electrode electricity of the first PMOS tube
Pressure difference is less than turn-on threshold voltage (i.e. VGS<-Vgth) and be connected, and the second PMOS tube and the 3rd PMOS are turned off, and are passed through by alternating current
Rear end voltage V5V powers after AC-DC converting unit, DC-DC converting unit and the first PMOS tube；It is insufficient or disconnected in mains-supplied
When electric, the output voltage V12V of AC-DC converting unit is lower than reference voltage VREF, and the in-phase output end of comparator exports low electricity
It is flat, the cut-off of the first NPN type triode, and the reversed-phase output of comparator exports high level, the second NPN type triode and third
NPN type triode conducting so that the second PMOS tube and third PMOS tube are both turned on, by battery component through the second PMOS tube and
Voltage V5V in rear end powers after third PMOS tube；When alternating current power down, it is as follows to turn the handoff procedure powered by battery component: the
The drain voltage VQ15 that two PMOS tube first turn on the → the second PMOS tube rises → as (VQ15-0.3V) > (V5V-Vgth), first
PMOS tube cut-off, wherein-Vgth is the turn-on threshold voltage of PMOS tube, for diode by taking Schottky diode as an example, 0.3V is Xiao
The forward voltage drop of special based diode → at this time the first PMOS tube and third PMOS tube are all ended, and rear end voltage V5V is by the one or two pole
Pipe and the two diodes of third diode is chosen from two-way power supply that higher road of voltage (that road of battery component place) into
Row power supply → DC-DC converting unit output voltage V5.1V decline, and (V5.1V-0.3V) < (V5V-Vgth), the 3rd PMOS
Pipe conducting, by battery component, rear end voltage V5V powers after the second PMOS tube and third PMOS tube, completes cutting for power supply
It changes；When alternating current re-powers, V5.1V voltage rises → as (V5.1V-0.3V) > (V5V-Vgth), the cut-off of third PMOS tube →
The first PMOS tube and third PMOS tube are all ended at this time, rear end voltage V5V by first diode and third diode the two two
Pole pipe chosen from two-way power supply that higher road of voltage (that road where alternating current) be powered the cut-off of the → the second PMOS tube →
VQ15 decline, and (VQ15-0.3V) < (V5V-Vgth), the first PMOS tube conducting, by alternating current through AC-DC converting unit, DC-
Rear end voltage V5V powers after DC converting unit and the first PMOS tube, completes the switching of power supply, the second PMOS tube and third
The cut-off sequencing of PMOS tube not necessarily, but does not influence the course of work of power supply switching.
After adopting the above structure, the invention has the following advantages that
The double loop power supply switching circuit of low-loss high reliability of the present invention is using field-effect tube as duplex feeding circuit
Switching switch, reduces the pressure drop of circuit, improves the transfer efficiency of power supply；The second diode and the four or two are utilized in switching
The two diodes of pole pipe, it is ensured that first PMOS tube of switching switch and third PMOS tube in duplex feeding circuit will not be led simultaneously
It is logical, it can only be provided to the back-end similar to the effect in dead zone so that the output of alternating current and the output of battery component are mutually indepedent
Electric energy, without flowing backward power supply；Using first diode and third diode the two diodes, in duplex feeding circuit
Switch the first PMOS tube of switch and third PMOS tube all in the of short duration time of off state (dead zone), automatically selects voltage more
Power supply gives rear end power supply all the way for high that, it is ensured that two-way power supply smoothly switches and rear end power supply does not power off；In addition, battery pack
The maximum charging voltage of part is not influenced by the other factors of circuit.
Preferably, the rear end voltage is 5V.The double loop power supply switching circuit of low-loss high reliability is answered in the setting
For in common 5V power supply system.
Preferably, the output of the AC-DC converting unit is 12V, the output of the DC-DC converting unit is 5.1V.
The setting of reasonable voltage can be such that parts selection is easier, power supply conversion is more convenient reliable.
Preferably, the voltage of the battery component is 4.8V.The setting can satisfy the use demand well.
Preferably, the battery component includes several nickel-metal hydride batteries.Nickel-metal hydride battery capacity is high, long service life, overall
Better performances.
Preferably, the battery component includes 4 section 1.2V nickel-metal hydride batteries.The setting can satisfy the use demand well.
Preferably, the first diode, the second diode, third diode and the 4th diode are two pole of Schottky
Pipe.Schottky diode pressure drop is small, less energy consumption, so that circuit performance is more excellent.
Preferably, the model of the first diode, the second diode, third diode and the 4th diode
BAT15-099.The model Schottky diode is more common, and performance is stablized excellent.
Preferably, the model MAX912 or MAX913 of the comparator.The model comparator is more common, and performance is steady
It is fixed excellent.
Preferably, the model SI2333CDS of first PMOS tube, the second PMOS tube and third PMOS tube.The type
Number PMOS tube is more common, and performance is stablized excellent.
Detailed description of the invention:
Fig. 1 is a kind of existing circuit diagram of double loop power supply switching circuit；
Fig. 2 is the circuit diagram of existing another double loop power supply switching circuit；
Fig. 3 is the circuit diagram of the double loop power supply switching circuit of low-loss high reliability of the present invention；
In prior art diagram: D1 ', D2 '-Schottky diode, Q1 ', Q2 ', Q3 '-PMOS tube, J1 ', J2 ', J3 '-NPN
Type triode, U1 ', U2 '-comparator；
In figure of the present invention: U1- comparator, D1- first diode, the second diode of D2-, D3- third diode, D4-
Four diodes, the first PMOS tube of Q1-, the second PMOS tube of Q2-, Q3- third PMOS tube, the first NPN type triode of J1-, J2- second
NPN type triode, J3- third NPN type triode, R1- first resistor, R2- second resistance, R3- 3rd resistor, the 4th electricity of R4-
Resistance, the 5th resistance of R5-.
Specific embodiment
With reference to the accompanying drawing, and in conjunction with the embodiments the present invention is described further.
Embodiment:
A kind of double loop power supply switching circuit of low-loss high reliability, it includes AC-DC converting unit, DC-DC conversion list
Member, battery component, battery charging and discharging administrative unit, the comparator U1 with two complementary outputs, first diode D1, the two or two pole
Pipe D2, third diode D3, the 4th diode D4, the first PMOS tube Q1, the second PMOS tube Q2, third PMOS tube Q3, the first NPN
Type triode J1, the second NPN type triode J2, third NPN type triode J3, first resistor R1, second resistance R2,3rd resistor
The AC input of R3, the 4th resistance R4, the 5th resistance R5, the AC-DC converting unit are electrically connected with alternating current, and the AC-DC turns
Change the DC output end of unit respectively with the input terminal of DC-DC converting unit, the non-inverting input terminal of comparator U1, battery charging and discharging pipe
Manage unit input terminal electrical connection, the output end of the DC-DC converting unit respectively with the anode of first diode D1, first
The drain electrode of PMOS tube Q1, the 4th diode D4 anode electrical connection, the output of the battery charging and discharging administrative unit respectively with electricity
The source electrode electrical connection of the anode of pond component, the second PMOS tube Q2, the cathode ground connection of the battery component, the second PMOS tube Q2
Drain electrode be electrically connected respectively with the drain electrode of the anode of the second diode D2, the anode of third diode D3, third PMOS tube Q3, institute
State the source electrode of the cathode of first diode D1, the source electrode of the first PMOS tube Q1, the cathode of third diode D3, third PMOS tube Q3
It is electrically connected with together as rear end power supply, the grid of the first PMOS tube Q1 passes through first resistor R1 and the first NPN type three
The collector of pole pipe J1 is electrically connected, and the grid of the first PMOS tube Q1 is also electrically connected with the cathode of the second diode D2, described
The in-phase output end of comparator U1 is electrically connected by second resistance R2 with the base stage of the first NPN type triode J1, the first NPN
The emitter of type triode J1 is grounded, and the reversed-phase output of the comparator U1 passes through three pole the 4th resistance R4 and the second NPN type
The base stage of pipe J2 is electrically connected, and the reversed-phase output of the comparator U1 also passes through the 5th resistance R5 and third NPN type triode J3
Base stage electrical connection, the collector of the second NPN type triode J2 is electrically connected with the grid of the second PMOS tube Q2, the third
The collector of NPN type triode J3 is electrically connected by 3rd resistor R3 with the grid of third PMOS tube Q3, the third PMOS tube
The grid of Q3 is electrically connected with the cathode of the 4th diode D4, the second NPN type triode J2 and third NPN type triode J3's
Emitter is grounded.In the present embodiment, the output of the AC-DC converting unit is 12V, the output of the DC-DC converting unit
For 5.1V, the rear end voltage is 5V；The battery component includes 4 section 1.2V nickel-metal hydride batteries；The first diode D1, second
Diode D2, third diode D3 and the 4th diode D4 are Schottky diode；The first diode D1, the second diode
The model BAT15-099 of D2, third diode D3 and the 4th diode D4；The model MAX912 of the comparator U1 or
MAX913；The model SI2333CDS of the first PMOS tube Q1, the second PMOS tube Q2 and third PMOS tube Q3.
The working principle of the double loop power supply switching circuit of low-loss high reliability of the present invention is as follows:
When mains-supplied is normal, the output voltage V12V of AC-DC converting unit is higher than the reference voltage of comparator U1
The in-phase output end of VREF, comparator U1 export high level, the first NPN type triode J1 conducting, so that the first PMOS tube
The gate-source voltage difference of Q1 is less than turn-on threshold voltage (i.e. VGS<-Vgth) and be connected, and the second PMOS tube Q2 and the 3rd PMOS are equal
Cut-off, by alternating current, rear end voltage V5V powers after AC-DC converting unit, DC-DC converting unit and the first PMOS tube Q1；?
When mains-supplied is insufficient or power-off, the output voltage V12V of AC-DC converting unit is lower than reference voltage VREF, and comparator U1's is same
Phase output terminal exports low level, the first NPN type triode J1 cut-off, and the reversed-phase output of comparator U1 exports high level, the
Two NPN type triode J2 and third NPN type triode J3 conducting, so that the second PMOS tube Q2 and third PMOS tube Q3 are led
Logical, by battery component, rear end voltage V5V powers after the second PMOS tube Q2 and third PMOS tube Q3；When alternating current power down, turn
The handoff procedure powered by battery component is as follows: the second PMOS tube Q2 first turns on the drain voltage VQ15 of the → the second PMOS tube Q2
Rise → when (VQ15-0.3V) > (V5V-Vgth), the first PMOS tube Q1 end, wherein-Vgth is the turn-on threshold electricity of PMOS tube
Pressure, 0.3V be Schottky diode forward voltage drop → at this time the first PMOS tube Q1 and third PMOS tube Q3 all end, rear end electricity
Pressure V5V is selected from two-way power supply by the first Schottky diode D1 and third Schottky diode D3 the two Schottky diodes
That road where higher that road battery component of voltage is taken to be powered → output voltage V5.1V the decline of DC-DC converting unit, and
And (V5.1V-0.3V) < (V5V-Vgth), third PMOS tube Q3 are connected, by battery component through the second PMOS tube Q2 and the 3rd PMOS
Voltage V5V in rear end powers after pipe Q3, completes the switching of power supply；When alternating current re-powers, the rising of V5.1V voltage → when
(V5.1V-0.3V) > (V5V-Vgth), third PMOS tube Q3 cut-off → the first PMOS tube Q1 and third PMOS tube Q3 are cut at this time
Only, voltage V5V in rear end is by the first Schottky diode D1 and the two Schottky diodes of third Schottky diode D3 from two
That road where choosing that higher road alternating current of voltage in the power supply of road is powered the → the second PMOS tube Q2 cut-off → VQ15 decline, and
And (VQ15-0.3V) < (V5V-Vgth), the first PMOS tube Q1 are connected, by alternating current through AC-DC converting unit, DC-DC converting unit
It powers with rear end voltage V5V after the first PMOS tube Q1, completes the switching of power supply, the second PMOS tube Q2 and third PMOS tube
The cut-off sequencing of Q3 not necessarily, but does not influence the course of work of power supply switching.
The double loop power supply switching circuit of low-loss high reliability of the present invention is using field-effect tube as duplex feeding circuit
Switching switch, reduces the pressure drop of circuit, improves the transfer efficiency of power supply；The second Schottky diode D2 is utilized in switching
With the 4th Schottky diode D4 the two diodes, it is ensured that switching switch the first PMOS tube Q1 and third in duplex feeding circuit
PMOS tube Q3 will not be simultaneously turned on, similar to the effect in dead zone, so that the output of alternating current and the output of battery component are mutual
It is independent, electric energy can only be provided to the back-end, without flowing backward power supply；Utilize the first Schottky diode D1 and third Schottky two
The two diodes of pole pipe D3, duplex feeding circuit switching switch the first PMOS tube Q1 and third PMOS tube Q3 all in cut
Only in the of short duration time in state dead zone, automatically select voltage it is higher that all the way power supply give rear end power supply, it is ensured that two-way electricity
Source smoothly switches and rear end power supply does not power off；In addition, the maximum charging voltage of battery component is not influenced by the other factors of circuit.
Claims (10)
1. a kind of double loop power supply switching circuit of low-loss high reliability, it include AC-DC converting unit, DC-DC converting unit,
Battery component, battery charging and discharging administrative unit, it is characterised in that: further include the comparator (U1) with two complementary outputs, first
Diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4), the first PMOS tube (Q1), second
PMOS tube (Q2), third PMOS tube (Q3), the first NPN type triode (J1), the second NPN type triode (J2), third NPN type three
Pole pipe (J3), first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), institute
The AC input for stating AC-DC converting unit is electrically connected with alternating current, the DC output end of the AC-DC converting unit respectively with DC-DC
The input terminal electrical connection of the input terminal of converting unit, the non-inverting input terminal of comparator (U1), battery charging and discharging administrative unit, it is described
The output end of DC-DC converting unit respectively with the anode of first diode (D1), the drain electrode of the first PMOS tube (Q1), the four or two pole
Manage (D4) anode electrical connection, the battery charging and discharging administrative unit output respectively with the anode of battery component, the 2nd PMOS
The source electrode electrical connection of (Q2) is managed, the cathode ground connection of the battery component, the drain electrode of second PMOS tube (Q2) is respectively with second
The drain electrode electrical connection of the anode of diode (D2), the anode of third diode (D3), third PMOS tube (Q3), the one or two pole
It is equal to manage the cathode of (D1), the source electrode of the first PMOS tube (Q1), the cathode of third diode (D3), the source electrode of third PMOS tube (Q3)
It is electrically coupled together as rear end power supply, the grid of first PMOS tube (Q1) passes through first resistor (R1) and the first NPN type
The collector of triode (J1) is electrically connected, and cathode of the grid of first PMOS tube (Q1) also with the second diode (D2) is electrically connected
It connects, the in-phase output end of the comparator (U1) is electrically connected by second resistance (R2) and the base stage of the first NPN type triode (J1)
It connects, the emitter ground connection of first NPN type triode (J1), the reversed-phase output of the comparator (U1) passes through the 4th resistance
(R4) it is electrically connected with the base stage of the second NPN type triode (J2), the reversed-phase output of the comparator (U1) also passes through the 5th electricity
Resistance (R5) is electrically connected with the base stage of third NPN type triode (J3), the collector and second of second NPN type triode (J2)
The grid of PMOS tube (Q2) is electrically connected, and the collector of the third NPN type triode (J3) passes through 3rd resistor (R3) and third
The grid of PMOS tube (Q3) is electrically connected, and the grid of the third PMOS tube (Q3) is electrically connected with the cathode of the 4th diode (D4),
Second NPN type triode (J2) and the emitter of third NPN type triode (J3) are grounded.
2. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 1, it is characterised in that: described
Rear end voltage is 5V.
3. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 2, it is characterised in that: described
The output of AC-DC converting unit is 12V, and the output of the DC-DC converting unit is 5.1V.
4. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 2, it is characterised in that: described
The voltage of battery component is 4.8V.
5. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 1, it is characterised in that: described
Battery component includes several nickel-metal hydride batteries.
6. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 4, it is characterised in that: described
Battery component includes 4 section 1.2V nickel-metal hydride batteries.
7. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 1, it is characterised in that: described
First diode (D1), the second diode (D2), third diode (D3) and the 4th diode (D4) are Schottky diode.
8. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 7, it is characterised in that: described
First diode (D1), the second diode (D2), third diode (D3) and the 4th diode (D4) model BAT15-
099。
9. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 1, it is characterised in that: described
The model MAX912 or MAX913 of comparator (U1).
10. a kind of double loop power supply switching circuit of low-loss high reliability according to claim 1, it is characterised in that: institute
State the model SI2333CDS of the first PMOS tube (Q1), the second PMOS tube (Q2) and third PMOS tube (Q3).
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| CN201811227995.XA CN109412255B (en) | 2018-10-22 | 2018-10-22 | Low-loss high-reliability double-circuit power supply switching circuit |
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| CN201811227995.XA CN109412255B (en) | 2018-10-22 | 2018-10-22 | Low-loss high-reliability double-circuit power supply switching circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912176A (en) * | 2019-12-09 | 2020-03-24 | 中国南方电网有限责任公司超高压输电公司 | High-reliability power supply method for converter valve controller |
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| CN112003368A (en) * | 2020-09-22 | 2020-11-27 | 杭州万高科技股份有限公司 | Power supply switching circuit |
| CN113224834A (en) * | 2021-05-28 | 2021-08-06 | 河北工业大学 | Main/standby power supply switching circuit for AUV (autonomous Underwater vehicle) |
| CN113224834B (en) * | 2021-05-28 | 2024-04-09 | 河北工业大学 | Main and standby power supply switching circuit for AUV |
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