CN111641257A - Uninterruptible power supply - Google Patents
Uninterruptible power supply Download PDFInfo
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- CN111641257A CN111641257A CN202010336618.0A CN202010336618A CN111641257A CN 111641257 A CN111641257 A CN 111641257A CN 202010336618 A CN202010336618 A CN 202010336618A CN 111641257 A CN111641257 A CN 111641257A
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- triode
- storage battery
- power supply
- bias resistor
- load
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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
- H02J9/062—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 AC 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The utility model provides an uninterrupted power source belongs to the power equipment field. The uninterruptible power supply includes: the charging circuit comprises a storage battery and a switching circuit, wherein the switching circuit comprises a first triode switch branch and a second triode switch branch, and the first triode switch branch is used for stopping charging the storage battery and controlling the storage battery to supply power to a load when the electric quantity of the storage battery during charging is higher than a first target voltage; and the second triode switch branch is used for stopping the storage battery from supplying power to the load when the electric quantity of the storage battery is lower than a second target voltage when the storage battery supplies power to the load, controlling an external power supply to charge the storage battery and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage.
Description
Technical Field
The present disclosure relates to power supply devices, and more particularly, to an uninterruptible power supply.
Background
An Uninterruptible Power Supply (UPS) is a Power Supply that supplies uninterruptible Power, and therefore, Power Supply cannot be interrupted due to a short Power outage, and equipment with a high requirement on Power stability can be effectively protected. The UPS contains an energy storage device, typically a battery. When the mains supply is input normally, the UPS supplies the mains supply to a load for use after stabilizing the voltage of the mains supply, and the UPS is an alternating current type voltage stabilizer and also charges a storage battery; when the commercial power is interrupted (such as accident power failure), the UPS immediately supplies the direct current electric energy of the storage battery to the load by a method of switching and converting the inverter to continuously supply 220V alternating current to the load, so that the load keeps normal work and protects the software and hardware of the load from being damaged.
As the UPS runs for a long time once being put into use, the storage battery in the UPS is in a charging state for a long time, the activity of mutual conversion of chemical energy and electric energy of the storage battery is reduced, and the independent power supply capacity of the UPS is greatly reduced. In order to maintain the power supply capability of the UPS at a high level, it is a related art to perform periodic discharge management of the UPS.
In the course of implementing the present disclosure, the inventors found that the prior art has at least the following problems: when the depth of discharge (the percentage of the discharge capacity of the battery to the rated capacity of the battery) of the storage battery reaches below the target percentage of the rated capacity of the storage battery, the battery is in power shortage, the number of times of recycling of the storage battery is reduced, and the service life of the UPS is shortened.
Disclosure of Invention
The embodiment of the disclosure provides an uninterruptible power supply, which can timely charge a storage battery when the storage battery discharges to a certain degree, and avoid the insufficient voltage of the storage battery caused by the overlarge discharge depth of the storage battery. The technical scheme is as follows:
the present disclosure provides an uninterruptible power supply, comprising: a storage battery and a switch circuit are arranged in the storage battery,
the switching circuit comprises a first triode switch branch and a second triode switch branch,
the first triode switch branch is used for stopping charging the storage battery and controlling the storage battery to supply power to a load when the electric quantity of the storage battery during charging is higher than a first target voltage;
and the second triode switch branch is used for stopping the storage battery from supplying power to the load when the electric quantity of the storage battery is lower than a second target voltage when the storage battery supplies power to the load, controlling an external power supply to charge the storage battery and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage.
Optionally, the first triode switch branch comprises: a first upper bias resistor, a first triode and a first lower bias resistor,
the first triode is a type triode and the saturation conduction voltage of the first triode is the first target voltage;
two ends of the first upper bias resistor are respectively and electrically connected with the anode of the storage battery and the first end of the first lower bias resistor,
a second end of the first lower bias resistor is electrically connected to a negative electrode of the battery,
the base electrode of the first triode is connected between the first upper biasing resistor and the first lower biasing resistor,
the collector of the first triode is connected between the positive electrode of the storage battery and the first input end of the load, and the emitter of the first triode is connected between the negative electrode of the storage battery and the second input end of the load.
Optionally, the first lower bias resistor is an adjustable resistor,
and the sliding end of the first lower bias resistor is electrically connected with the base electrode of the first triode.
Optionally, the second triode switch branch comprises: a second upper bias resistor, a second triode and an electromagnetic relay,
the resistance value of the first upper bias resistor is larger than that of the second upper bias resistor,
the second triode is a type triode, and the saturation conducting voltage of the second triode is the second target voltage;
the electromagnetic relay comprises a coil, a first normally open contact, a first normally closed contact and a second normally open contact;
one end of the second upper bias resistor is electrically connected with the anode of the storage battery, the second end of the second upper bias resistor is electrically connected with the collector of the first triode,
the base electrode of the second triode is connected between the second end of the second upper bias resistor and the collector electrode of the first triode,
the collector of the second triode is connected between the positive electrode of the storage battery and the first input end of the load, the emitter of the second triode is connected between the negative electrode of the storage battery and the second input end of the load,
the coil of the electromagnetic relay is connected in series with the collector of the second triode, the first normally open contact is connected between the anode of the storage battery and the first input end of the external power supply, the first normally closed contact is connected between the coil and the first input end of the load, and the second normally open contact is connected between the anode of the storage battery and the first input end of the load.
Optionally, the second triode switch circuit further comprises a reverse diode,
the positive pole of the backward diode is connected between the coil and the collector of the second triode, and the negative pole of the backward diode is connected between the coil and the second upper bias resistor.
Optionally, the electromagnetic relay further comprises a fourth normally closed contact,
the first triode switch branch further comprises: a second lower bias resistor and a third triode,
the third triode is a type triode;
the second lower bias resistance is connected in parallel with the first lower bias resistance,
the base electrode of the third triode is connected between the second lower biasing resistor and the first upper biasing resistor,
the collector of the third triode is connected between the collector of the first triode and the base of the second triode,
and the emitter of the third triode is connected between the emitter of the first triode and the emitter of the second triode.
Optionally, the second lower bias resistor is an adjustable resistor,
and the sliding end of the second lower bias resistor is electrically connected with the base electrode of the third triode.
Optionally, the uninterruptible power supply further includes: a charger for charging the battery with a battery,
the storage battery is electrically connected with the external power supply through the charger, and the first normally open contact is connected between the first input end of the charger and the first input end of the external power supply in series.
Optionally, the uninterruptible power supply further includes: an indicator light is provided on the display panel,
the indicating lamp string is connected between the second input end of the external power supply and the second input end of the charger.
Optionally, the uninterruptible power supply further includes: an inverter for converting the voltage of the power source into a DC voltage,
the battery is electrically connected to the load through the inverter.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
the uninterruptible power supply comprises a storage battery and a switching circuit, the switching circuit comprises a first triode switch branch and a second triode switch branch, and the first triode switch branch is used for stopping charging the storage battery and controlling the storage battery to supply power to a load when the electric quantity of the storage battery during charging is higher than a first target voltage; the storage battery can be discharged after the storage battery is charged, so that the storage battery is prevented from being charged for a long time, and the power supply capacity of the storage battery is maintained at a higher level; the second triode switch branch is used for stopping the power supply of the storage battery to the load when the electric quantity of the storage battery is lower than a second target voltage when the storage battery supplies power to the load, controlling the external power supply to charge the storage battery and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage; can in time charge for the battery when the battery discharges and reaches the certain degree, avoid the battery insufficient voltage that the battery depth of discharge is too big to arouse, improve the life of battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an uninterruptible power supply according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an uninterruptible power supply according to an embodiment of the present disclosure.
In the drawings, the circuit elements are numbered as follows:
the electronic ballast comprises an E storage battery, a first triode switch branch circuit 1, a first upper bias resistor R1, a first T1 triode, a first lower bias resistor P1, a second lower bias resistor P2, a third T3 triode, a second triode switch branch circuit 2, an upper bias resistor R2, a second T2 triode, a J electromagnetic relay, a K coil, a first S1 normally open contact, a first S2 normally closed contact, a second S3 normally open contact, a fourth S4 normally closed contact, a D backward diode, a 3 charger, a 4 indicator lamp, a 5 inverter, a 6 direct current converter, a 7 filter and an 8 rectifier.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an uninterruptible power supply provided in an embodiment of the present disclosure, referring to fig. 1, the uninterruptible power supply includes: a battery E and a switching circuit.
The switching circuit comprises a first triode switch branch 1 and a second triode switch branch 2.
The first triode switch branch circuit 1 is used for stopping charging the storage battery E and controlling the storage battery E to supply power to a load when the electric quantity of the storage battery E in charging is higher than a first target voltage.
The second triode switch branch 2 is used for stopping the storage battery E from supplying power to the load when the electric quantity of the storage battery E is lower than a second target voltage when the storage battery E supplies power to the load, controlling an external power supply to charge the storage battery E and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage.
In the embodiment of the disclosure, the uninterruptible power supply includes a storage battery E and a switching circuit, the switching circuit includes a first triode switch branch 1 and a second triode switch branch 2, and the first triode switch branch 1 is used for stopping charging the storage battery E and controlling the storage battery E to supply power to a load when the electric quantity of the storage battery E during charging is higher than a first target voltage; the storage battery E can be discharged after the storage battery E is charged, so that the storage battery E is prevented from being charged for a long time, and the power supply capacity of the storage battery E is maintained at a high level; the second triode switch branch 2 is used for stopping the storage battery E from supplying power to the load when the electric quantity of the storage battery E is lower than a second target voltage when the storage battery E supplies power to the load, controlling an external power supply to charge the storage battery E and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage; can in time charge for battery E when battery E discharges and reaches the certain degree, avoid battery E depth of discharge too big to arouse battery E insufficient voltage, improve battery E's life. Therefore, the storage battery E is reasonably used and maintained to be kept in a good operation state.
In addition, because the charging and discharging of the storage battery E are controlled through the circuit, the computer control module is not needed to participate, and the reliable control of the charging and discharging of the storage battery E can be ensured under the condition that the computer control module fails.
Alternatively, the external power source may be mains (220V).
Alternatively, the first target voltage may be a maximum operating voltage of the battery E, the second target voltage may be a minimum operating voltage of the battery E, and values of the first target voltage and the second target voltage may be set based on a rated operating voltage of the battery E. For example, the rated operating voltage of battery E is 24V. Based on this, the first target voltage may be 27V, and the second target voltage may be 22V.
The first triode switch branch 1 and the second triode switch branch 2 can be switching circuits mainly comprising triodes. In this embodiment, an NPN type transistor is taken as an example, and the circuit structures of the first transistor switch branch 1 and the second transistor switch branch 2 are described.
Illustratively, the first triode switch branch 1 includes: the circuit comprises a first upper bias resistor R1, a first triode T1 and a first lower bias resistor P1.
The first transistor T1 is an NPN transistor and the saturated conduction voltage of the first transistor T1 is the first target voltage.
Both ends of the first upper bias resistor R1 are electrically connected to the positive electrode of the battery E and the first end of the first lower bias resistor P1, respectively.
A second terminal of the first lower bias resistor P1 is electrically connected to the negative terminal of the battery E.
The base of the first transistor T1 is connected between the first upper bias resistor R1 and the first lower bias resistor P1.
The collector of the first transistor T1 is connected between the positive pole of the battery E and the first input terminal of the load, and the emitter of the first transistor T1 is connected between the negative pole of the battery E and the second input terminal of the load.
Illustratively, the first lower bias resistor P1 is an adjustable resistor, and the sliding terminal of the first lower bias resistor P1 is electrically connected to the base of the first transistor T1.
With first triode switch branch 1 phase-match ground, second triode switch branch 2 includes: a second upper bias resistor R2, a second triode T2 and an electromagnetic relay J.
The first upper bias resistor R1 has a larger resistance than the second upper bias resistor R2.
The second transistor T2 is an NPN transistor and the saturated turn-on voltage of the second transistor T2 is the second target voltage.
The electromagnetic relay J includes a coil K, a first normally open contact S1, a first normally closed contact S2, and a second normally open contact S3.
One end of the second upper bias resistor R2 is electrically connected to the positive electrode of the battery E, and the second end of the second upper bias resistor R2 is electrically connected to the collector of the first transistor T1.
The base of the second transistor T2 is connected between the second terminal of the second upper bias resistor R2 and the collector of the first transistor T1.
The collector of the second transistor T2 is connected between the positive pole of the battery E and the first input terminal of the load, and the emitter of the second transistor T2 is connected between the negative pole of the battery E and the second input terminal of the load.
A coil K of the electromagnetic relay J is connected in series with a collector of a second triode T2, a first normally open contact S1 is connected between the positive electrode of the storage battery E and the first input end of an external power supply, a first normally closed contact S2 is connected between the coil K and the first input end of a load, and a second normally open contact S3 is connected between the positive electrode of the storage battery E and the first input end of the load.
The first triode switch branch circuit 1 is an overvoltage detection circuit, and the second triode switch branch circuit 2 is an undervoltage detection circuit. In the second triode switch branch 2, the second upper bias resistor R2 is used as a load resistor of the collector of the first triode T1 to play a role in limiting current, and is also used as a bias resistor of the base of the second triode T2 to enable the base voltage of the second triode T2 to be higher than the emitter, so that the second triode T2 can be conducted and saturated; the second triode T2 is turned on when the voltage of the battery E drops to a second target voltage, and the electromagnetic relay J is used to control the switching of the charging circuit and the power supply circuit.
In the first triode switch branch 1, the first upper biasing resistor R1 and the first lower biasing resistor P1 are used as biasing resistors of the base electrode of the first triode T1, so that the voltage of the base electrode of the first triode T1 is higher than that of the emitting electrode and is stabilized at 0.7V, and the first triode T1 can be conducted and saturated; the first transistor T1 is turned on when the voltage of the battery E reaches the first target voltage.
In application, the storage battery E may be charged in advance when the UPS is first started, so that the voltage of the storage battery E reaches the first target voltage. Like this, when the UPS starts for the first time, can switch on first triode T1 and make second triode T3 end, because electromagnetic relay J can not be electrified when second triode T3 ends, because of first normally open contact S1 disconnection between battery E and the external voltage, like this, uninterrupted power source' S initial operating condition is: the battery E supplies power to the load. When the voltage of the storage battery E is reduced to reach a second target voltage, the second triode T2 is conducted, the coil K of the electromagnetic relay J is electrified, the first normally open contact S1 and the second normally open contact S3 are both closed, and an external power supply supplies power to the storage battery E and the load respectively; when the voltage of the storage battery E rises to reach a first target voltage, the first triode T1 is conducted, the second triode T2 is cut off after the first triode T1 is conducted, the coil K of the electromagnetic relay J loses power, the first normally open contact S1 and the second normally open contact S3 are switched from closed to open, the connection between an external power supply and the storage battery E is disconnected, the storage battery E stops charging, and the storage battery E supplies power to a load, so that the cycle is realized.
Illustratively, the second triode switch circuit further comprises a reverse diode D. The anode of the backward diode D is connected between the coil K and the collector of the second transistor T2, and the cathode of the backward diode D is connected between the coil K and the second upper bias resistor R2.
The role of the backward diode D is: when the electromagnetic relay J releases the armature, self-induced electromotive force is generated in the coil K, so that instantaneous impulse voltage exists, inductive current jump is caused, reverse instantaneous large current is caused, the second triode T2 is damaged, the instantaneous large current is guided away by utilizing the one-way conduction characteristic of the backward diode D, and the second triode T2 is protected.
Illustratively, the electromagnetic relay J further includes a fourth normally closed contact S4.
Corresponding to the fourth normally closed contact S4, the first triode switch branch further includes: a second lower bias resistor P2 and a third transistor T3.
The third transistor T3 is an NPN transistor.
The second lower bias resistor P2 is connected in parallel with the first lower bias resistor P1.
The base of the third transistor T3 is connected between the second lower bias resistor P2 and the first upper bias resistor R1.
The collector of the third transistor T3 is connected between the collector of the first transistor T1 and the base of the second transistor T2.
The emitter of the third transistor T3 is connected between the emitter of the first transistor T1 and the emitter of the second transistor T2.
In application, the operation of charging the UPS in advance to ensure that the initial voltage of the storage battery is higher than or equal to the first target voltage is troublesome, and in order to directly use the UPS in the device, that is, the initial operating voltage of the UPS storage battery is between the second target voltage and the first target voltage, it is required to ensure that the first triode switch branch can control the storage battery to supply power to the load between the second target voltage and the first target voltage. The turn-on saturation voltage of the third transistor T3 is the second target voltage — the first target voltage, so that the third transistor T3 can be turned on when the UPS initially operates, so that the second transistor T2 is turned off, the electromagnetic relay is not powered, and the battery E supplies power to the load. The first upper bias resistor R1 and the second lower bias resistor P2 are used as bias resistors of the base of the third transistor T3, so that the base voltage of the third transistor T3 is higher than the emitter and is stabilized at 0.7V, thereby enabling the third transistor T3 to be turned on and saturated, and the third transistor T3 is used for turning on the voltage of the battery E when the voltage is between the second target voltage and the first target voltage.
Illustratively, the second lower bias resistor P2 is an adjustable resistor, and the sliding end of the second lower bias resistor P2 is electrically connected to the base of the third transistor T3.
The first lower bias resistor P1 and the second lower bias resistor P2 are respectively set as adjustable resistors, and the method has the advantages that the voltages of the collector and the emitter of the triodes (T1 and T3) are synchronously measured by gradually adjusting the resistance values of the adjustable resistors, so that the collector and the emitter of the triodes (T1 and T3) enter a boundary of saturation and amplification, the saturation state is confirmed, and the resistance parameters are set more accurately. It should be noted that the adjustment of the adjustable resistor is performed in advance, and when the UPS is in operation, the resistance value of the adjustable resistor is a fixed value.
In addition, with the use of the storage battery E, the working voltage of the storage battery E is attenuated, and the adjustable resistor can enable the T1 and the T2 to be conducted, so that the service life of the UPS is prolonged.
Illustratively, the uninterruptible power supply further includes: a charger 3.
The storage battery E is electrically connected with an external power supply through the charger 3, and the first normally open contact S1 is connected in series between the first input end of the charger 3 and the first input end of the external power supply.
The charger 3 is configured to convert a voltage of an external power supply into an input voltage of the battery E.
Illustratively, the uninterruptible power supply further includes: and an indicator light 4.
The indicator lamp 4 is connected in series between the second input terminal of the external power supply and the second input terminal of the charger 3.
The indicator lamp 4 is used for lighting when the external power supply is communicated with the charger 3 to prompt a user that the storage battery E is in a charging state.
It should be noted that, in this embodiment, values of R1/R2/P1/P2(R1> > R2) are not limited, and only appropriate values of R1/R2/P1/P2 need to be selected, so that the first triode T1 is in a saturated state when the battery E voltage is equal to the first target voltage, and T3 is in a saturated conduction state when the battery E voltage is equal to the second target voltage.
Alternatively, the rated operating voltage of the battery E may be 24V, the first target voltage may be 27V, the second target voltage may be 22V, and accordingly, R1 ═ 56K Ω, R2 ═ 2.2K Ω, P1 ═ P2 ═ 12K Ω, and the models of the respective transistors (first to third transistors) may be 9013 series; the model of the electromagnetic relay J can be JQX-4F.
The uninterruptible power supply is divided according to the voltage of the storage battery E, and supports three operation modes, mode (1), mode (2) and mode (3), which are specifically described as follows.
In the mode (1), the voltage of the storage battery E is more than 22V and less than or equal to 27V, at this time, the saturated collector of the third triode T3 is conducted, and the second triode T2 is cut off and disconnected; the battery E supplies power to the load. The initial operating state of the UPS may be mode (1).
In the mode (2), the voltage of the storage battery E is less than or equal to 22V, at the moment, the saturated collector electrode of the second triode T2 is conducted, the first triode T1 and the third triode T3 are cut off and disconnected, the coil K of the electromagnetic relay J is electrified, and the power supply starts to charge the storage battery E.
In the mode (3), the voltage of the storage battery E is more than 27V, at this time, the saturated collector of the first triode T1 is conducted, the second triode T2 is cut off, the coil K loses power, then the saturated collector of the third triode T3 is conducted (T1 is lower than 27V and cannot be cut off, the saturated collector and the T2 work simultaneously for a long time, and can be cut off when the saturated collector is lower than 22V), the charging is stopped, and the battery power supply is recovered.
Base current i of the third transistor T3b3Comprises the following steps: i.e. ib3＝(E-VR1-VBE)/P2On the upper part-VBE/P2Lower part；VR1Is a voltage of R1, P2On the upper partResistance of the upper section at the sliding end of P2, P2Lower partThe resistance of the lower segment at the sliding end of P2.
Base current i of the first transistor T1b1Comprises the following steps: i.e. ib1＝(E-VR1-VBE)/P1On the upper part-VBE/P1Lower part；P1On the upper partResistance of the upper section at the sliding end of P1, P1Lower partThe resistance of the lower segment at the sliding end of P1.
Wherein, the voltage V of the base electrode and the emitter electrode of the triode (T1-T3)BEThis is the on voltage of the transistor, 0.7 v.
When the UPS is initially operated, the P2 value is set (P2)On the upper partDescent, P2Lower partIs raised) so that ib3Rising, the collector of the third triode T3 reaches the saturation region; the third transistor T3 is switched as a second transistor T2, which corresponds to a switch closed, and the collector and emitter voltages V of the second transistor T2CE<0.3V (this is the cut-off voltage of the transistor), at which time the second transistor T2 is turned off.
When the voltage of E under voltage<At 22V, ib1 and ib3 decrease, and VBE<0.7V, T1, T3 cut off, V of T2BERising; the current ib2 of T2 rises, causing the T2 collector to conduct in saturation, starting to charge.
E gradually increases during charging, and V of T1BEUp, ib1 rises, T1 goes from off to on and saturation, where V is turned onCE<0.3V, V of T2BE<0.3, T2 is cut off, S3 is closed, T3 is saturated and conducted, and power is supplied to the load.
Fig. 2 is a schematic structural diagram of an uninterruptible power supply according to an embodiment of the present disclosure. Referring to fig. 2, the uninterruptible power supply illustratively further includes: and an inverter 5.
The battery E is electrically connected to a load through the inverter 5.
The inverter 5 is configured to convert the dc power supplied from the battery E into ac power and supply the ac power to a load.
Referring to fig. 2, optionally, the uninterruptible power supply further includes: and a DC converter 6.
The dc converter 6 is connected between the battery E and the inverter 5.
The dc converter 6 is used to boost the dc voltage provided by the battery E to the dc bus voltage of the UPS design.
Referring to fig. 2, optionally, the uninterruptible power supply further includes: and a filter 7.
The filter 7 is connected between the inverter 5 and the load.
The filter 7 is used for filtering the ac power output from the inverter 5.
Referring to fig. 2, optionally, the uninterruptible power supply further includes: and a rectifier 8.
The series circuit of the charger 3, the battery E and the dc converter 6 is connected in parallel with the rectifier 8.
The rectifier 8 is used for rectifying alternating current output by an external power supply and converting the alternating current into direct current, and the rectified direct current and the direct current of the direct current converter 6 jointly enter the inverter 5, so that harmonic pollution of the UPS fed back to a power grid is reduced, and the utilization rate of the UPS to the power grid is improved.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. An uninterruptible power supply, comprising: a storage battery (E) and a switch circuit,
the switching circuit comprises a first triode switch branch (1) and a second triode switch branch (2),
the first triode switch branch circuit (1) is used for stopping charging the storage battery (E) and controlling the storage battery (E) to supply power to a load when the electric quantity of the storage battery (E) is higher than a first target voltage during charging;
the second triode switch branch circuit (2) is used for stopping the storage battery (E) from supplying power to the load when the electric quantity of the storage battery (E) is lower than a second target voltage when the storage battery (E) supplies power to the load, controlling an external power supply to charge the storage battery (E) and controlling the external power supply to supply power to the load, wherein the first target voltage is higher than the second target voltage.
2. Uninterruptible power supply according to claim 1, characterized in that the first triode switch branch (1) comprises: a first upper bias resistor (R1), a first triode (T1) and a first lower bias resistor (P1),
the first transistor (T1) is an NPN transistor and a saturation turn-on voltage of the first transistor (T1) is the first target voltage;
both ends of the first upper bias resistor (R1) are electrically connected with the positive electrode of the storage battery (E) and the first end of the first lower bias resistor (P1) respectively,
a second terminal of the first lower bias resistor (P1) is electrically connected to the negative pole of the battery (E),
the base of the first triode (T1) is connected between the first upper bias resistor (R1) and the first lower bias resistor (P1),
the collector of the first triode (T1) is connected between the positive pole of the storage battery (E) and the first input end of the load, and the emitter of the first triode (T1) is connected between the negative pole of the storage battery (E) and the second input end of the load.
3. The uninterruptible power supply of claim 2, wherein the first lower bias resistance (P1) is an adjustable resistance,
the sliding end of the first lower bias resistor (P1) is electrically connected with the base electrode of the first triode (T1).
4. The uninterruptible power supply of claim 2, wherein the second triode switch branch (2) comprises: a second upper bias resistor (R2), a second triode (T2) and an electromagnetic relay (J),
the first upper bias resistor (R1) has a resistance value larger than that of the second upper bias resistor (R2),
the second transistor (T2) is an NPN transistor and the saturation conducting voltage of the second transistor (T2) is the second target voltage;
the electromagnetic relay (J) includes a coil (K), a first normally open contact (S1), a first normally closed contact (S2), and a second normally open contact (S3);
one end of the second upper bias resistor (R2) is electrically connected with the positive electrode of the storage battery (E), the second end of the second upper bias resistor (R2) is electrically connected with the collector electrode of the first triode (T1),
the base of the second triode (T2) is connected between the second end of the second upper bias resistor (R2) and the collector of the first triode (T1),
the collector of the second triode (T2) is connected between the positive pole of the storage battery (E) and the first input end of the load, the emitter of the second triode (T2) is connected between the negative pole of the storage battery (E) and the second input end of the load,
the coil (K) of the electromagnetic relay (J) is connected in series with the collector of the second triode (T2), the first normally open contact (S1) is connected between the positive pole of the storage battery (E) and the first input end of the external power supply, the first normally closed contact (S2) is connected between the coil (K) and the first input end of the load, and the second normally open contact (S3) is connected between the positive pole of the storage battery (E) and the first input end of the load.
5. The uninterruptible power supply of claim 4, wherein the second triode switch circuit further comprises a reverse diode (D),
the anode of the backward diode (D) is connected between the coil (K) and the collector of the second triode (T2), and the cathode of the backward diode (D) is connected between the coil (K) and the second upper bias resistor (R2).
6. The uninterruptible power supply of claim 4,
the electromagnetic relay (J) further includes a fourth normally closed contact (S4),
the first triode switch branch (1) further comprises: a second lower bias resistor (P2) and a third transistor (T3),
the third triode (T3) is an NPN type triode;
the second lower bias resistance (P2) is connected in parallel with the first lower bias resistance (P1),
the base of the third triode (T3) is connected between the second lower bias resistor (P2) and the first upper bias resistor (R1),
the collector of the third triode (T3) is connected between the collector of the first triode (T1) and the base of the second triode (T2),
the emitter of the third triode (T3) is connected between the emitter of the first triode (T1) and the emitter of the second triode (T2).
7. The UPS of claim 6, wherein the second lower bias resistor (P2) is an adjustable resistor,
the sliding end of the second lower bias resistor (P2) is electrically connected with the base electrode of the third triode (T3).
8. The uninterruptible power supply of claim 4, further comprising: a charger (3) for charging the battery,
the storage battery (E) is electrically connected with the external power supply through the charger (3), and the first normally open contact (S1) is connected between a first input end of the charger (3) and a first input end of the external power supply in series.
9. The uninterruptible power supply of claim 8, further comprising: an indicator light (4),
the indicator lamp (4) is connected in series between the second input end of the external power supply and the second input end of the charger (3).
10. The uninterruptible power supply of any of claims 1 to 9, further comprising: an inverter (5) for converting the voltage of the power source,
the battery (E) is electrically connected to the load via the inverter (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336618.0A CN111641257A (en) | 2020-04-26 | 2020-04-26 | Uninterruptible power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010336618.0A CN111641257A (en) | 2020-04-26 | 2020-04-26 | Uninterruptible power supply |
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| CN111641257A true CN111641257A (en) | 2020-09-08 |
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| CN202010336618.0A Pending CN111641257A (en) | 2020-04-26 | 2020-04-26 | Uninterruptible power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206074678U (en) * | 2016-10-14 | 2017-04-05 | 中铁建设集团设备安装有限公司 | A kind of line voltage exception indicating circuit |
| CN108183546A (en) * | 2017-12-23 | 2018-06-19 | 马良彬 | A kind of electrical construction direct current safety power supply |
| CN209448421U (en) * | 2019-04-18 | 2019-09-27 | 上海奉天电子股份有限公司 | A kind of overvoltage/undervoltage protection detection circuit of low cost high stability |
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2020
- 2020-04-26 CN CN202010336618.0A patent/CN111641257A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206074678U (en) * | 2016-10-14 | 2017-04-05 | 中铁建设集团设备安装有限公司 | A kind of line voltage exception indicating circuit |
| CN108183546A (en) * | 2017-12-23 | 2018-06-19 | 马良彬 | A kind of electrical construction direct current safety power supply |
| CN209448421U (en) * | 2019-04-18 | 2019-09-27 | 上海奉天电子股份有限公司 | A kind of overvoltage/undervoltage protection detection circuit of low cost high stability |
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Application publication date: 20200908 |