CN218335414U - On-line AC uninterrupted power supply - Google Patents
On-line AC uninterrupted power supply Download PDFInfo
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- CN218335414U CN218335414U CN202222063243.2U CN202222063243U CN218335414U CN 218335414 U CN218335414 U CN 218335414U CN 202222063243 U CN202222063243 U CN 202222063243U CN 218335414 U CN218335414 U CN 218335414U
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Abstract
The utility model relates to the technical field of power, an online interchange uninterrupted power source is proposed, including the AC/DC circuit and the DC/AC circuit that connect gradually, the input and the electric wire netting of AC/DC circuit are connected, the output and the load of DC/AC circuit are connected, DC/AC circuit includes the power tube, each power tube all is provided with the drive protection circuit, the drive protection circuit includes resistance R1, electric capacity C1, stabilivolt DW1, diode D2 and triode Q7, resistance R1's first end is connected with drive signal, resistance R1's second end passes through the source electrode that electric capacity C1 inserted the power tube, resistance R1's second end is connected with stabilivolt DW 1's negative pole, stabilivolt DW 1's positive pole inserts triode Q7's base, triode Q7's projecting pole is connected with the source electrode of power tube. Through the technical scheme, the problem of high failure rate of the alternating current uninterruptible power supply in the prior art is solved.
Description
Technical Field
The utility model relates to a power technical field, it is specific, relate to an online alternating current uninterrupted power source.
Background
An uninterruptible power supply is a constant voltage and constant frequency uninterruptible power supply which contains an energy storage device (usually a storage battery) and takes an inverter as a main component, can solve the problems of power failure, low voltage, high voltage, surge, noise and the like of the existing electric power, enables a computer system to run more safely and reliably, and is widely applied to the industries of computers, traffic, banks, securities, communication, medical treatment, industrial control and the like. When the inverter works, a power tube in the inverter can be damaged due to overvoltage or overcurrent, and for overcurrent faults, the traditional protection mode is to use a mutual inductor to carry out current-voltage conversion, then carry out voltage comparison, and use a level signal obtained by voltage comparison to block a driving pulse so as to realize protection.
SUMMERY OF THE UTILITY MODEL
The utility model provides an online AC uninterrupted power source has solved the problem that AC uninterrupted power source fault rate is high among the correlation technique.
The technical scheme of the utility model as follows: the power supply comprises an AC/DC circuit and a DC/AC circuit which are sequentially connected, wherein the input end of the AC/DC circuit is connected with a power grid, the output end of the DC/AC circuit is connected with a load, the battery BAT also comprises a battery BAT, the two ends of the battery BAT are connected with the power grid through a charging circuit, the two ends of the battery BAT are connected with the output end of the AC/DC circuit in parallel, the DC/AC circuit comprises power tubes, each power tube is provided with a driving protection circuit, the driving protection circuit comprises a resistor R1, a capacitor C1, a voltage-regulator tube DW1, a diode D2 and a triode Q7, the first end of the resistor R1 is connected with a driving signal, the second end of the resistor R1 is connected with the source electrode of the power tube through the capacitor C1, the second end of the resistor R1 is connected with the cathode of the voltage-regulator tube DW1, the anode of the voltage-regulator tube DW1 is connected with the base electrode of the triode Q7, the emitter of the triode Q7 is connected with the source electrode of the power tube, the collector electrode of the power tube is connected with the grid electrode of the power tube, the drain electrode of the power tube is connected with the diode D2, and the cathode of the voltage-regulator tube DW1 is connected with the cathode of the diode D2.
Further, the driving protection circuit further comprises a diode D1, a cathode of the diode D1 is connected with the first end of the resistor R1, and an anode of the diode D1 is connected with the second end of the resistor R1.
Further, a capacitor C4 is connected in parallel between the base and the emitter of the triode Q7.
Further, a resistor R2 is connected in parallel between the grid electrode and the source electrode of the power tube.
Further, still include overvoltage crowbar, overvoltage crowbar is including the electric wire netting voltage detection circuit, rectifier circuit, comparator U1A and triode Q8 that connect gradually, voltage detection circuit is used for detecting the electric wire netting voltage, rectifier circuit's output inserts comparator U1A's in-phase input end, comparator U1A's inverting input end is connected with reference voltage VREF, comparator U1A's output inserts triode Q8's base, triode Q8's projecting pole ground connection, triode Q8's collecting electrode is connected with the one end of relay K1 coil, the other end of relay K1 coil is connected with power VCC, relay K1's normally closed contact establish ties at the electric wire netting with between the AC/DC circuit.
Further, the voltage detection circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R10, a resistor R9, a resistor R8 and a resistor R7 which are connected in series, one end of the resistor R4 is connected with an L line of a power grid, one end of the resistor R7 is connected with an N line of the power grid, and two ends of the resistor R10 are used as output ends of the voltage detection circuit and are connected into the rectification circuit.
Further, the rectifying circuit comprises a rectifying bridge consisting of a diode D3, a diode D4, a diode D5 and a diode D6, and the output end of the rectifying bridge is connected with a capacitor C5 in parallel.
The utility model discloses a theory of operation and beneficial effect do:
when the power grid voltage is normal, the utility model supplies power to the load by the power grid voltage sequentially through the AC/DC circuit and the DC/AC circuit, and simultaneously charges the battery BAT through the charging circuit; when the power grid is suddenly cut off, the load is supplied with power by the battery through the DC/AC circuit, and the continuous power supply of the load is ensured.
The AC/DC circuit and the DC/AC circuit both adopt circuit topologies commonly used in the field, the main components of the AC/DC circuit and the DC/AC circuit are power tubes, and each power tube is provided with a drive protection circuit for receiving a PWM drive signal sent by a controller and controlling the on or off of the power tube. The working principle is as follows: at the moment when the driving signal jumps to a high level, due to the charging delay effect of the capacitor C1, the voltage at two ends of the capacitor C1 is lower, the voltage stabilizing tube DW1 is cut off, the triode Q7 is cut off, the driving signal is added between the grid electrode and the source electrode of the power tube, the drain electrode and the source electrode of the power tube are in saturated conduction, the diode D2 is in forward bias conduction, and the voltage stabilizing tube DW1 and the triode Q7 are kept in a cut-off state; when the power tube has overcurrent faults, the drain-source voltage of the power tube is rapidly increased, the diode D2 is reversely biased to be cut off, the voltage stabilizing tube DW1 is broken down and conducted along with the charging of the capacitor C1, the triode Q7 is conducted, the grid-source voltage of the power tube is close to zero, the power tube is reliably cut off, and the power tube is prevented from being damaged; for overcurrent protection caused by severe change of an inductive load, after an overcurrent fault is eliminated, the drain-source voltage of the power tube is restored to be close to zero, the diode D2 is restored to be conducted, the voltage-stabilizing tube DW1 and the triode Q1 are restored to be cut off, and the power tube restores to work normally.
The utility model discloses well drive protection circuit response speed is fast, can realize overflowing the reliable protection of trouble to whole uninterrupted power source's fault rate has been reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of a middle driving protection circuit of the present invention;
FIG. 3 is a schematic diagram of the medium overvoltage protection circuit of the present invention;
in the figure: 1 driving protection circuit and 2 overvoltage protection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive work, are related to the scope of protection of the present invention.
As shown in fig. 1-2, the uninterruptible power supply of this embodiment includes an AC/DC circuit and a DC/AC circuit connected in sequence, an input end of the AC/DC circuit is connected to a power grid, an output end of the DC/AC circuit is connected to a load, and further includes a battery BAT, two ends of the battery BAT are connected to the power grid through a charging circuit, two ends of the battery BAT are connected in parallel with an output end of the AC/DC circuit, the DC/AC circuit includes power tubes, each power tube is provided with a driving protection circuit, the driving protection circuit includes a resistor R1, a capacitor C1, a voltage regulator DW1, a diode D2 and a triode Q7, a first end of the resistor R1 is connected to a driving signal, a second end of the resistor R1 is connected to a source electrode of the power tube through the capacitor C1, a second end of the resistor R1 is connected to a cathode of the voltage regulator DW1, an anode of the voltage regulator DW1 is connected to a base of the triode Q7, an emitter of the triode Q7 is connected to a source electrode of the power tube, a collector of the triode Q7 is connected to a gate of the power tube, a drain electrode of the diode D2 is connected to a cathode of the power tube, and a cathode of the D2 is connected to a cathode of the voltage regulator DW 1.
In the embodiment, when the power grid voltage is normal, the power grid voltage sequentially passes through the AC/DC circuit and the DC/AC circuit to supply power to the load, and meanwhile, the power grid voltage charges the battery BAT through the charging circuit; when the power grid is suddenly cut off, the load is supplied with power by the battery through the DC/AC circuit, and the continuous power supply of the load is ensured.
The AC/DC circuit and the DC/AC circuit both adopt circuit topologies commonly used in the field, the main components of the AC/DC circuit and the DC/AC circuit are MOSFET power tubes, and each power tube is provided with a drive protection circuit for receiving a drive signal PWM2B sent by a controller and controlling the conduction or the disconnection of the power tube. Taking one of the MOSFET power transistors as an example, the operating principle is as follows: as shown in fig. 2, at the moment when the driving signal PWM2B jumps to a high level, due to the charging delay effect of the capacitor C1, the voltage at the two ends of the capacitor C1 is low, the voltage regulator DW1 is cut off, the triode Q7 is cut off, the driving signal is applied between the gate and the source of the power tube, the drain and the source of the power tube are in saturation conduction, the diode D2 is in forward bias conduction, and the voltage regulator DW1 and the triode Q7 are kept in a cut-off state; when the power tube has an overcurrent fault, the drain-source voltage of the power tube is rapidly increased, the diode D2 is reversely biased to be cut off, the voltage stabilizing tube DW1 is broken down and conducted along with the charging of the capacitor C1, the triode Q7 is conducted, the grid-source voltage of the power tube is close to zero, the power tube is reliably cut off, and the power tube is prevented from being damaged; for overcurrent protection caused by severe change of an inductive load, after an overcurrent fault is eliminated, the drain-source voltage of the power tube is restored to be close to zero, the diode D2 is restored to be conducted, the voltage-stabilizing tube DW1 and the triode Q1 are restored to be cut off, and the power tube restores to work normally.
The drive protection circuit in the embodiment has high response speed, and can realize reliable protection of overcurrent faults, so that the fault rate of the whole uninterrupted power supply is reduced.
Further, as shown in fig. 2, the driving protection circuit further includes a diode D1, a cathode of the diode D1 is connected to the first end of the resistor R1, and an anode of the diode D1 is connected to the second end of the resistor R1.
When the driving signal PWM2B is low, the capacitor C1 is rapidly discharged through the diode D1 in preparation for the integration delay of the next control period.
Further, as shown in fig. 2, a capacitor C4 is connected in parallel between the base and the emitter of the transistor Q7.
The capacitor C4 is used for filtering high-frequency interference between the base electrode and the emitting electrode of the triode Q7 and avoiding the mis-conduction of the triode Q7.
Further, as shown in fig. 2, a resistor R2 is connected in parallel between the gate and the source of the power transistor.
The resistor R2 is connected between the grid electrode and the source electrode of the power tube in parallel, so that the high-frequency oscillation of the grid electrode can be inhibited, and the power tube is prevented from being damaged by the high-frequency oscillation.
Further, still include the overvoltage crowbar, as shown in fig. 3, the overvoltage crowbar includes the electric wire netting voltage detection circuit that connects gradually, a rectifying circuit, comparator U1A and triode Q8, the voltage detection circuit is used for detecting the electric wire netting voltage, the output of rectifying circuit inserts the homophase input of comparator U1A, the inverting input of comparator U1A is connected with reference voltage VREF, the base of triode Q8 is inserted to the output of comparator U1A, triode Q8's projecting pole ground connection, triode Q8's collecting electrode is connected with the one end of relay K1 coil, the other end of relay K1 coil is connected with power VCC, relay K1's normally closed contact is established ties between electric wire netting and AC/DC circuit.
In the embodiment, the overvoltage protection circuit is used for timely disconnecting the power grid from a subsequent circuit when the voltage of the power grid is too high, so that the circuit elements are prevented from being damaged by overvoltage faults. The working principle is as follows: the output voltage of the voltage detection circuit is alternating voltage transformed in the same proportion as the power grid voltage, the alternating voltage signal is rectified by the rectifying circuit and then is connected to the in-phase input end of the comparator U1A, the in-phase input end of the comparator U1A is compared with reference voltage VREF connected to the out-phase input end of the comparator U1A, when the power grid voltage is too high, the output voltage of the rectifying circuit is larger than the reference voltage VREF, the comparator U1A outputs a high-level signal to the base electrode of the triode Q8, the triode Q8 is conducted, the coil of the relay K1 is electrified, the normally closed contact of the relay K1 is used for disconnecting the power grid from a subsequent circuit in time.
The resistor R12 and the resistor R13 form a series voltage division circuit which is arranged between a power supply 5V and the ground, the terminal voltage of the resistor R13 is used as a reference voltage VREF to be connected to the inverting input end of the comparator U1A, and the magnitude of the reference voltage VREF can be adjusted by adjusting the resistance values of the resistor R12 and the resistor R13 according to actual needs.
Further, as shown in fig. 3, the voltage detection circuit includes a resistor R4, a resistor R5, a resistor R6, a resistor R10, a resistor R9, a resistor R8, and a resistor R7 connected in series, one end of the resistor R4 is connected to the L line of the power grid, one end of the resistor R7 is connected to the N line of the power grid, and two ends of the resistor R10 are used as output ends of the voltage detection circuit and are connected to the rectification circuit.
The resistor R4, the resistor R5, the resistor R6, the resistor R10, the resistor R9, the resistor R8 and the resistor R7 form a series voltage division circuit, and the voltage at the two ends of the resistor R10 changes in proportion to the power grid voltage, so that the power grid voltage is detected.
Further, as shown in fig. 3, the rectifier circuit includes a rectifier bridge composed of a diode D3, a diode D4, a diode D5 and a diode D6, and the output end of the rectifier bridge is connected in parallel with a capacitor C5.
After the output of the voltage detection circuit is rectified by the rectifying circuit, the output voltage of the rectifying circuit can reflect the effective value of the power grid voltage, and when the power grid voltage is too high, the output voltage of the rectifying circuit is too high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the present invention.
Claims (7)
1. The on-line alternating current uninterruptible power supply is characterized in that the DC/AC circuit comprises power tubes, each power tube is provided with a driving protection circuit (1), the driving protection circuit (1) comprises a resistor R1, a capacitor C1, a voltage regulator tube DW1, a diode D2 and a triode Q7, the first end of the resistor R1 is connected with a driving signal, the second end of the resistor R1 is connected with the source electrode of the power tube through the capacitor C1, the second end of the resistor R1 is connected with the cathode of the voltage regulator tube DW1, the anode of the voltage regulator tube DW1 is connected with the base electrode of the triode Q7, the emitter of the triode Q7 is connected with the source electrode of the power tube Q7, the collector of the power tube DW 2 is connected with the drain electrode of the diode DW 2, and the cathode of the diode D2 are connected with the cathode of the diode DW 2.
2. An online alternating current uninterruptible power supply according to claim 1, characterized in that the driving protection circuit (1) further comprises a diode D1, a cathode of the diode D1 is connected to the first end of the resistor R1, and an anode of the diode D1 is connected to the second end of the resistor R1.
3. An in-line ac ups according to claim 1 wherein a capacitor C4 is connected in parallel between the base and emitter of transistor Q7.
4. An on-line ac ups as claimed in claim 1 wherein a resistor R2 is connected in parallel between the gate and source of the power transistor.
5. The online alternating current uninterruptible power supply according to claim 1, further comprising an overvoltage protection circuit (2), wherein the overvoltage protection circuit (2) comprises a power grid voltage detection circuit, a rectification circuit, a comparator U1A and a triode Q8, which are connected in sequence, the voltage detection circuit is used for detecting the power grid voltage, an output end of the rectification circuit is connected to a non-inverting input end of the comparator U1A, an inverting input end of the comparator U1A is connected to a reference voltage VREF, an output end of the comparator U1A is connected to a base of the triode Q8, an emitter of the triode Q8 is grounded, a collector of the triode Q8 is connected to one end of a coil of a relay K1, the other end of the coil of the relay K1 is connected to a power source VCC, and a normally closed contact of the relay K1 is connected in series between the power grid and the AC/DC circuit.
6. The online alternating current uninterruptible power supply of claim 5, wherein the voltage detection circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R10, a resistor R9, a resistor R8 and a resistor R7 connected in series, one end of the resistor R4 is connected to the L line of the power grid, one end of the resistor R7 is connected to the N line of the power grid, and two ends of the resistor R10 are used as the output ends of the voltage detection circuit and are connected to the rectification circuit.
7. An online ac uninterruptible power supply according to claim 5, wherein the rectifier circuit comprises a rectifier bridge composed of a diode D3, a diode D4, a diode D5 and a diode D6, and the output terminal of the rectifier bridge is connected in parallel with a capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222063243.2U CN218335414U (en) | 2022-08-05 | 2022-08-05 | On-line AC uninterrupted power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222063243.2U CN218335414U (en) | 2022-08-05 | 2022-08-05 | On-line AC uninterrupted power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218335414U true CN218335414U (en) | 2023-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222063243.2U Active CN218335414U (en) | 2022-08-05 | 2022-08-05 | On-line AC uninterrupted power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218335414U (en) |
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- 2022-08-05 CN CN202222063243.2U patent/CN218335414U/en active Active
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