An online UPS three-phase input discrete rectification and battery access circuit

Abstract

The present invention relates to an online UPS three-phase input discrete rectification and battery access circuit, comprising an input filter circuit, a three-phase input discrete rectification and battery access circuit, a thyristor control circuit and a main controller, three-phase alternating current is accessed into the input filter circuit, the input filter circuit is electrically connected to the three-phase input discrete rectification and battery access circuit, the three-phase input discrete rectification and battery access circuit is electrically connected to the UPS boost energy storage circuit, the battery is electrically connected to the three-phase input discrete rectification and battery access circuit, and the thyristor control circuit is electrically connected to the main controller and the three-phase input discrete rectification and battery access circuit respectively. After the three-phase alternating current is filtered by the input filter circuit, the three-phase input discrete rectification and battery access circuit performs full-wave rectification on each phase independently and then outputs it to the UPS boost energy storage circuit, so that the working states of each phase of the three-phase alternating current do not affect each other, making the rear-end high-power boost energy storage more reliable, and facilitating more balanced distribution of electric energy after each UPS module works in parallel.

Description

Technical Field

[0001] The invention relates to the technical field of three-phase AC power supply circuits, and in particular to an online UPS three-phase input discrete rectification and battery access circuit. Background Art

[0002] With the rapid development of switching power supply technology, uninterruptible power supply UPS now has new features of high power, modularization and online. High-power uninterruptible power supply UPS above 10KVA generally uses three-phase four-wire AC input. Three-phase AC often has imbalance. Three-phase AC is used for independent full-wave rectification of each phase to the neutral line. The working state of each phase of three-phase AC is not affected by each other, making the back-end high-power boost energy storage more reliable. Due to the modularization and online needs of UPS power supply, the battery is directly connected to the front end of the UPS three-phase rectification and boosting circuit, which is conducive to more balanced power distribution after each UPS module works in parallel. The ordinary three-phase full-bridge rectifier circuit design cannot meet the requirements and cannot solve the above problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an online UPS three-phase input discrete rectification and battery access circuit in view of the above-mentioned deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: an online UPS three-phase input discrete rectification and battery access circuit, including an input filter circuit, a three-phase input discrete rectification and battery access circuit, a thyristor control circuit and a main controller, an external three-phase AC power is connected to the input end of the input filter circuit, the output end of the input filter circuit is electrically connected to the three-phase AC power input end of the three-phase input discrete rectification and battery access circuit, the output end of the three-phase input discrete rectification and battery access circuit is electrically connected to the input end of the UPS boost energy storage circuit, the output end of the battery is electrically connected to the battery input end of the three-phase input discrete rectification and battery access circuit, the control signal input circuit of the thyristor control circuit is electrically connected to the control signal output end of the main controller, and the control signal output circuit of the thyristor control circuit is electrically connected to the control signal input circuit of the three-phase input discrete rectification and battery access circuit.

[0005] The beneficial effects of the present invention are as follows: the online UPS three-phase input discrete rectification and battery access circuit of the present invention, after the three-phase AC is filtered by the input filtering circuit, the three-phase input discrete rectification and battery access circuit independently full-wave rectifies each phase and outputs it to the UPS boost energy storage circuit, so that the working state of each phase of the three-phase AC is not affected by each other, making the rear-end high-power boost energy storage more reliable, and due to the modularization and online requirements of the UPS power supply, the battery is directly connected to the front end of the three-phase input discrete rectification and battery access circuit, which is conducive to more balanced power distribution after the parallel operation of each UPS module, and at the same time, when the three-phase AC power is cut off, the main controller controls the thyristor control circuit to drive the three-phase input discrete rectification and battery access circuit to access the battery, so that the battery is connected to the UPS boost energy storage circuit through the three-phase input discrete rectification and battery access circuit.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows:

[0007] Further: the input filter circuit includes a fuse F1, a fuse F2, a fuse F3, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2 and a capacitor C3; the fuse F1, the inductor L1 and the capacitor C1 are sequentially connected in series between the R phase of the external three-phase AC power supply and the neutral line, and the inductor L1 and the capacitor C1 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit; the fuse F2, the inductor L2 and the capacitor C2 are sequentially connected in series between the S phase of the external three-phase AC power supply and the neutral line, and the inductor L2 and the capacitor C2 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit; the fuse F3, the inductor L3 and the capacitor C3 are sequentially connected in series between the T phase of the external three-phase AC power supply and the neutral line, and the inductor L3 and the capacitor C3 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit.

[0008] The beneficial effect of the above further scheme is: the LC filtering circuit of each phase live line to neutral line formed by the inductor L1 and the capacitor C1, the inductor L2 and the capacitor C2, and the inductor L3 and the capacitor C3 can effectively suppress the high-frequency noise of the external power grid and deliver cleaner AC power to the back-end rectifier circuit.

[0009] Further: the three-phase input discrete rectification and battery access circuit includes a gate-controlled input filter circuit, a thyristor VT1, a thyristor VT2, a thyristor VT3, a thyristor VT4, a thyristor VT5, a thyristor VT6, a thyristor VT7, a thyristor VT8, a thyristor VT9, a thyristor VT10, a thyristor VT11 and a thyristor VT12, the anode of the thyristor VT1 and the cathode of the thyristor VT4 are respectively electrically connected to the first output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT1 are respectively connected to the two first output terminals of the gate-controlled input filter circuit, the cathode and gate of the thyristor VT4 are respectively electrically connected to the two fourth output terminals of the gate-controlled input filter circuit The anode of the thyristor VT2 and the cathode of the thyristor VT5 are respectively electrically connected to the second output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT2 are respectively electrically connected to the two second output terminals of the gate-controlled input filter circuit, the cathode and gate of the thyristor VT5 are respectively electrically connected to the two fifth output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT3 and the cathode of the thyristor VT6 are respectively electrically connected to the third output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT3 are respectively electrically connected to the two third output terminals of the gate-controlled input filter circuit, the cathode and gate of the thyristor VT6 are respectively electrically connected to the The two sixth output terminals are electrically connected correspondingly, the anodes of the thyristor VT7, the thyristor VT8, and the thyristor VT9 are electrically connected to the positive electrode of the battery respectively, the cathode of the thyristor VT7 and the cathode of the thyristor VT1 are electrically connected to the input terminal R+ of the UPS boost energy storage circuit respectively, the cathode and gate of the thyristor VT7 are electrically connected to the two seventh output terminals of the gate-controlled input filter circuit respectively, the cathode of the thyristor VT8 and the cathode of the thyristor VT2 are electrically connected to the input terminal S+ of the UPS boost energy storage circuit respectively, the cathode and gate of the thyristor VT8 are electrically connected to the two eighth output terminals of the gate-controlled input filter circuit respectively, the cathode of the thyristor VT9 is electrically connected to the cathode of the thyristor VT3 The cathodes of the thyristors VT10, VT11 and VT12 are respectively electrically connected to the negative electrode of the battery, the anodes of the thyristors VT10 and VT4 are respectively electrically connected to the input terminals R- of the UPS boost energy storage circuit, the cathodes and gates of the thyristors VT10 are respectively electrically connected to the two tenth output terminals of the gate-controlled input filter circuit, the anodes of the thyristors VT11 and VT5 are respectively electrically connected to the input terminals S- of the UPS boost energy storage circuit,The cathode and gate of the thyristor VT11 are respectively electrically connected to the two eleventh output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT12 and the anode of the thyristor VT6 are respectively electrically connected to the input terminal T- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT12 are respectively electrically connected to the two twelfth output terminals of the gate-controlled input filter circuit, and the input terminals of the gate-controlled input filter circuit are respectively electrically connected to the corresponding output terminals of the thyristor control circuit.

[0010] The beneficial effect of the above further scheme is: by setting thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, thyristor VT6, thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11 and thyristor VT12, when three-phase AC power is supplied, thyristor VT1 and thyristor VT4 are alternately turned on and work in the positive and negative half-cycle of the R-phase AC sine wave, and the R-phase AC power is output to the UPS boost energy storage input terminals R+ and R- after independent full-wave rectification; thyristor VT2 and thyristor VT5 are alternately turned on and work in the positive and negative half-cycle of the S-phase AC sine wave, and the S-phase AC power is output to the boost energy storage input terminals S+ and S- after independent full-wave rectification; thyristor VT3 and thyristor VT6 are alternately turned on and work in the positive and negative half-cycle of the T-phase AC sine wave, and the T-phase AC After independent full-wave rectification, the electricity is output to the boost energy storage input terminals T+ and T-; the R, S, and T three-phase AC input sinusoidal waves differ in phase by 120 degrees, and each phase is independently full-wave rectified without affecting each other, and each phase independently full-wave rectified shares the UPS neutral line N; when the three-phase AC power is off, thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, and thyristor VT6 are cut off and stop working; thyristor VT7 and thyristor VT10 are turned on, and the battery is connected to the boost energy storage input terminals R+ and R-; at the same time, thyristor VT8 and thyristor VT11 are turned on, and the battery is connected to the boost energy storage input terminals S+ and S-, and at the same time, thyristor VT9 and thyristor VT12 are turned on, and the battery is connected to the boost energy storage input terminals T+ and T-, and the battery current is evenly distributed to the three UPS boost energy storage input terminals.

[0011] Further: the gate control input filter circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, the resistor R1 and the capacitor C4 are connected in parallel to the cathode of the thyristor VT1 The cathode of the thyristor VT1 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R2 is electrically connected between the gate of the thyristor VT1 and another output terminal corresponding to the thyristor control circuit, the resistor R3 and the capacitor C5 are connected in parallel between the cathode and gate of the thyristor VT2, the cathode of the thyristor VT2 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R4 is electrically connected between the gate of the thyristor VT2 and another output terminal corresponding to the thyristor control circuit, the resistor R5 and the capacitor C6 are connected in parallel between the cathode and gate of the thyristor VT3, the cathode of the thyristor VT3 is electrically connected to the output terminal corresponding to the thyristor control circuit The resistor R6 is electrically connected between the gate of the thyristor VT3 and another output terminal corresponding to the thyristor control circuit. The resistor R7 and the capacitor C7 are connected in parallel between the cathode and gate of the thyristor VT4. The cathode of the thyristor VT4 is electrically connected to an output terminal corresponding to the thyristor control circuit. The resistor R8 is electrically connected between the gate of the thyristor VT4 and another output terminal corresponding to the thyristor control circuit. The resistor R9 and the capacitor C8 are connected in parallel between the cathode and gate of the thyristor VT5. The cathode of the thyristor VT5 is electrically connected to an output terminal corresponding to the thyristor control circuit. The resistor R10 is electrically connected between the cathode and gate of the thyristor VT5. The resistor R11 and the capacitor C9 are connected in parallel between the cathode and the gate of the thyristor VT6, the cathode of the thyristor VT6 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R12 is electrically connected between the gate of the thyristor VT6 and another output terminal corresponding to the thyristor control circuit, the resistor R13 and the capacitor C10 are connected in parallel between the cathode and the gate of the thyristor VT7, the cathode of the thyristor VT7 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R14 is electrically connected between the gate of the thyristor VT7 and another output terminal corresponding to the thyristor control circuit,The resistor R15 and the capacitor C11 are connected in parallel between the cathode and the gate of the thyristor VT8, the cathode of the thyristor VT8 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R16 is electrically connected between the gate of the thyristor VT8 and another output terminal corresponding to the thyristor control circuit, the resistor R17 and the capacitor C12 are connected in parallel between the cathode and the gate of the thyristor VT9, the cathode of the thyristor VT9 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R18 is electrically connected between the gate of the thyristor VT9 and another output terminal corresponding to the thyristor control circuit, the resistor R19 and the capacitor C13 are connected in parallel between the cathode and the gate of the thyristor VT10, the cathode of the thyristor VT10 is electrically connected to the output terminal corresponding to the thyristor control circuit An output terminal is electrically connected, the resistor R20 is electrically connected between the gate of the thyristor VT10 and another output terminal corresponding to the thyristor control circuit, the resistor R21 and the capacitor C14 are connected in parallel between the cathode and gate of the thyristor VT11, the cathode of the thyristor VT11 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R22 is electrically connected between the gate of the thyristor VT11 and another output terminal corresponding to the thyristor control circuit, the resistor R23 and the capacitor C15 are connected in parallel between the cathode and gate of the thyristor VT12, the cathode of the thyristor VT12 is electrically connected to an output terminal corresponding to the thyristor control circuit, and the resistor R24 ​​is electrically connected between the gate of the thyristor VT12 and another output terminal corresponding to the thyristor control circuit. ,

[0012] The beneficial effect of the above further solution is that by providing an RC filter circuit between the gate of each thyristor and the thyristor control circuit, the control signal output by the thyristor control circuit can be filtered to remove clutter and ensure the accuracy of the control signal.

[0013] Further: the three-phase input discrete rectification and battery access circuit also includes an RC peak absorption circuit, and the twelve input ends and twelve output ends of the RC peak absorption circuit are respectively electrically connected to the cathode and anode of the thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, thyristor VT6, thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11 and thyristor VT12.

[0014] The beneficial effect of the above further scheme is that by electrically connecting an RC peak absorption circuit between the cathode and anode of each thyristor, at the moment when the corresponding thyristor is turned off, the reverse peak voltage generated by it can form a charging circuit through a resistor and a capacitor, and the charging current controls the peak voltage within a certain range to prevent the thyristor from being broken down.

[0015] Further: the RC peak absorption circuit includes a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26 and a capacitor C27, the resistor R25 and the capacitor C16 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT1, the resistor R26 and the capacitor C17 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT2, the resistor R27 and the capacitor C18 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT3, the resistor R28 and the capacitor C19 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT4 The resistor R29 and the capacitor C20 are connected in series and in parallel between the anode and cathode of the thyristor VT5, the resistor R30 and the capacitor C21 are connected in series and in parallel between the anode and cathode of the thyristor VT6, the resistor R31 and the capacitor C22 are connected in series and in parallel between the anode and cathode of the thyristor VT7, the resistor R32 and the capacitor C23 are connected in series and in parallel between the anode and cathode of the thyristor VT8, the resistor R33 and the capacitor C24 are connected in series and in parallel between the anode and cathode of the thyristor VT9, the resistor R34 and the capacitor C25 are connected in series and in parallel between the anode and cathode of the thyristor VT10, the resistor R35 and the capacitor C26 are connected in series and in parallel between the anode and cathode of the thyristor VT11, and the resistor R36 and the capacitor C27 are connected in series and in parallel between the anode and cathode of the thyristor VT12.

[0016] Further: the thyristor control circuit includes twelve thyristor control sub-circuits, the input ends of the thyristor control sub-circuits are respectively electrically connected to the control signal output ends of the main controller, and the output ends of the thyristor control sub-circuits are respectively electrically connected to the input ends corresponding to the gate control input filter circuits.

[0017] The beneficial effect of the above further scheme is that: by setting the thyristor control subcircuit, the corresponding thyristors can be driven to work through the control signals output by the main controller respectively, so that when three-phase AC power is supplied, each phase is independently full-wave rectified and output to the UPS boost energy storage circuit. When the three-phase AC power is cut off, the battery can be connected to the UPS boost energy storage circuit and supply power to it.

[0018] Further: the thyristor control subcircuit includes a transistor Q1, a transistor Q2, a resistor R37, a resistor R38, a capacitor C28, a MOS tube Q3, a diode D1, a diode D2, a resistor R39, a capacitor C29, a transformer T1, a diode D3, a resistor R40, a resistor R41, a capacitor C30 and a capacitor C31, the base of the transistor Q1 and the transistor Q2 are electrically connected to the control signal output terminal of the main controller, and the collector of the transistor Q1 is connected to the power supply + 15V is electrically connected, the emitter of the transistor Q1 is electrically connected to the emitter of the transistor Q2, the collector of the transistor Q2 is grounded, the resistor R37 and the resistor R38 are connected in series between the emitter and the collector of the transistor Q2, the capacitor C28 is connected in parallel at both ends of the resistor R38, the common end of the resistor R37 and the resistor R38 is electrically connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is grounded, and the The drain is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the cathode of the diode D1, the anode of the diode D1 is electrically connected to the power supply +15V, the resistor R39 is connected in parallel to both ends of the diode D1, the capacitor C29 is electrically connected between the power supply +15V and the ground, the two ends of the primary coil of the transformer T1 are electrically connected to the anode of the diode D1 and the anode of the diode D2 respectively, one end of the secondary coil of the transformer T1 is electrically connected to the anode of the diode D3, the capacitor C30 is electrically connected between the cathode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R41 and the capacitor C31 are connected in series in sequence between the cathode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R40 is connected in parallel to both ends of the resistor R41, and the two ends of the capacitor C31 are electrically connected as output ends to the first input end corresponding to the gate control input filter circuit.

[0019] The beneficial effect of the above further scheme is that: when the three-phase AC input power supply starts the positive half cycle of the three-phase AC sine wave, the main controller outputs high-level trigger signals CPU-1, CPU-2, and CPU-3 with a phase difference of 120 degrees of the three-phase AC sine wave, and controls the thyristor VT1, thyristor VT2, and thyristor VT3 to turn on and work respectively; when the three-phase AC sine wave starts the negative half cycle, the thyristor VT1, thyristor VT2, and thyristor VT3 are cut off and do not work, and the main controller outputs high-level trigger signals CPU-1, CPU-2, and CPU-3 with a phase difference of 120 degrees of the three-phase AC sine wave, and controls the thyristor VT1, thyristor VT2, and thyristor VT3 to turn on and work respectively. The phase difference outputs high-level trigger signals CPU-4, CPU-5, and CPU-6 to control thyristor VT4, thyristor VT5, and thyristor VT6 to turn on and work, and the three phases are independently full-wave rectified and output. When the three-phase AC power is off, the main controller outputs a high-level trigger signal CPU-7, and at the same time controls thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11, and thyristor VT12 to turn on and work, so that the battery is connected, which plays the function of an online UPS. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an online UPS three-phase input discrete rectification and battery access circuit according to an embodiment of the present invention;

[0021] Figure 2 A circuit diagram of an input filter circuit and a three-phase input discrete rectification and battery access circuit according to an embodiment of the present invention;

[0022] Figure 3 FIG. 4 is a circuit diagram of a thyristor control sub-circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1As shown, an online UPS three-phase input discrete rectification and battery access circuit includes an input filter circuit, a three-phase input discrete rectification and battery access circuit, a thyristor control circuit and a main controller. External three-phase AC power is connected to the input end of the input filter circuit, the output end of the input filter circuit is electrically connected to the three-phase AC power input end of the three-phase input discrete rectification and battery access circuit, the output end of the three-phase input discrete rectification and battery access circuit is electrically connected to the input end of the UPS boost energy storage circuit, the output end of the battery is electrically connected to the battery input end of the three-phase input discrete rectification and battery access circuit, the control signal input circuit of the thyristor control circuit is electrically connected to the control signal output end of the main controller, and the control signal output circuit of the thyristor control circuit is electrically connected to the control signal input circuit of the three-phase input discrete rectification and battery access circuit.

[0025] The online UPS three-phase input discrete rectification and battery access circuit of the present invention, after the three-phase AC power is filtered by the input filtering circuit, the three-phase input discrete rectification and battery access circuit independently full-wave rectifies each phase and outputs it to the UPS boost energy storage circuit, so that the working state of each phase of the three-phase AC power is not affected by each other, making the rear-end high-power boost energy storage more reliable. Due to the modularization and online requirements of the UPS power supply, the battery is directly connected to the front end of the three-phase input discrete rectification and battery access circuit, which is conducive to more balanced power distribution after the parallel operation of each UPS module. At the same time, when the three-phase AC power is cut off, the main controller controls the thyristor control circuit to drive the three-phase input discrete rectification and battery access circuit to access the battery, so that the battery is connected to the UPS boost energy storage circuit through the three-phase input discrete rectification and battery access circuit.

[0026] like Figure 2 As shown, in one or more embodiments of the present invention, the input filter circuit includes a fuse F1, a fuse F2, a fuse F3, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2 and a capacitor C3, and the fuse F1, the inductor L1 and the capacitor C1 are sequentially connected in series between the R phase and the neutral line of the external three-phase AC power supply, and the inductor L1 and the capacitor C1 are electrically connected to the corresponding three-phase AC power supply input terminal of the three-phase input discrete rectification and battery access circuit, and the external three-phase The fuse F2, inductor L2 and capacitor C2 are connected in series between the S phase of the AC power supply and the neutral line, and the inductor L2 and capacitor C2 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit. The fuse F3, inductor L3 and capacitor C3 are connected in series between the T phase of the external three-phase AC power supply and the neutral line, and the inductor L3 and capacitor C3 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit.

[0027] The LC filter circuit of each phase live line to neutral line formed by the inductor L1 and the capacitor C1, the inductor L2 and the capacitor C2, and the inductor L3 and the capacitor C3 can effectively suppress the high-frequency noise of the external power grid and deliver cleaner AC power to the back-end rectifier circuit.

[0028] like Figure 3As shown, in one or more embodiments of the present invention, the three-phase input discrete rectification and battery access circuit includes a gate-controlled input filter circuit, a thyristor VT1, a thyristor VT2, a thyristor VT3, a thyristor VT4, a thyristor VT5, a thyristor VT6, a thyristor VT7, a thyristor VT8, a thyristor VT9, a thyristor VT10, a thyristor VT11 and a thyristor VT12, the anode of the thyristor VT1 and the cathode of the thyristor VT4 are respectively electrically connected to the first output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT1 are respectively connected to the two first output terminals of the gate-controlled input filter circuit, and the cathode and gate of the thyristor VT4 are respectively connected to the The two fourth output terminals of the gate-controlled input filter circuit are electrically connected correspondingly, the anode of the thyristor VT2 and the cathode of the thyristor VT5 are electrically connected to the second output terminal corresponding to the input filter circuit respectively, the cathode and gate of the thyristor VT2 are electrically connected to the two second output terminals of the gate-controlled input filter circuit respectively, the cathode and gate of the thyristor VT5 are electrically connected to the two fifth output terminals of the gate-controlled input filter circuit respectively, the anode of the thyristor VT3 and the cathode of the thyristor VT6 are electrically connected to the third output terminal corresponding to the input filter circuit respectively, and the cathode and gate of the thyristor VT3 are electrically connected to the two third output terminals of the gate-controlled input filter circuit respectively. The cathode and gate of the thyristor VT6 are respectively electrically connected to the two sixth output terminals of the gate-controlled input filter circuit, the anodes of the thyristors VT7, VT8 and VT9 are respectively electrically connected to the positive electrode of the battery, the cathode of the thyristor VT7 and the cathode of the thyristor VT1 are respectively electrically connected to the input terminal R+ of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT7 are respectively electrically connected to the two seventh output terminals of the gate-controlled input filter circuit, the cathode of the thyristor VT8 and the cathode of the thyristor VT2 are respectively electrically connected to the input terminal S+ of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT8 are respectively electrically connected to the gate-controlled output The two eighth output terminals of the input filter circuit are connected correspondingly, the cathode of the thyristor VT9 and the cathode of the thyristor VT3 are respectively electrically connected to the input terminal T+ of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT9 are respectively electrically connected to the two ninth output terminals of the gate-controlled input filter circuit, the cathodes of the thyristors VT10, thyristors VT11, and thyristors VT12 are respectively electrically connected to the negative electrode of the battery, the anode of the thyristor VT10 and the anode of the thyristor VT4 are respectively electrically connected to the input terminal R- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT10 are respectively electrically connected to the two tenth output terminals of the gate-controlled input filter circuit,The anode of the thyristor VT11 and the anode of the thyristor VT5 are respectively electrically connected to the input terminal S- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT11 are respectively electrically connected to the two eleventh output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT12 and the anode of the thyristor VT6 are respectively electrically connected to the input terminal T- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT12 are respectively electrically connected to the two twelfth output terminals of the gate-controlled input filter circuit, and the input terminals of the gate-controlled input filter circuit are respectively electrically connected to the corresponding output terminals of the thyristor control circuit.

[0029] By setting thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, thyristor VT6, thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11 and thyristor VT12, when three-phase AC power is supplied, thyristor VT1 and thyristor VT4 are alternately turned on in the positive and negative half-cycle of the R-phase AC sine wave, and the R-phase AC is output to the UPS boost energy storage input terminals R+ and R- after independent full-wave rectification; thyristor VT2 and thyristor VT5 are alternately turned on in the positive and negative half-cycle of the S-phase AC sine wave, and the S-phase AC is output to the boost energy storage input terminals S+ and S- after independent full-wave rectification; thyristor VT3 and thyristor VT6 are alternately turned on in the positive and negative half-cycle of the T-phase AC sine wave, and the T-phase AC is output to the boost energy storage input terminals S+ and S- after independent full-wave rectification. After rectification, the output is sent to the boost energy storage input terminals T+ and T-; the R, S, and T three-phase AC input sine waves differ in phase by 120 degrees, and each phase is independently fully rectified without affecting each other, and each phase independently fully rectified shares the UPS neutral line N; when the three-phase AC power fails, thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, and thyristor VT6 are cut off and stop working; thyristor VT7 and thyristor VT10 are turned on, and the battery is connected to the boost energy storage input terminals R+ and R-; at the same time, thyristor VT8 and thyristor VT11 are turned on, and the battery is connected to the boost energy storage input terminals S+ and S-; at the same time, thyristor VT9 and thyristor VT12 are turned on, and the battery is connected to the boost energy storage input terminals T+ and T-, and the battery current is evenly distributed to the three UPS boost energy storage input terminals.

[0030] In one or more embodiments of the present invention, the gate control input filter circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, wherein the resistor R1 and the capacitor C4 are connected in parallel in the The resistor R2 is electrically connected between the gate of the thyristor VT1 and another output terminal corresponding to the thyristor control circuit, the resistor R3 and the capacitor C5 are connected in parallel between the cathode and gate of the thyristor VT2, the cathode of the thyristor VT2 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R4 is electrically connected between the gate of the thyristor VT2 and another output terminal corresponding to the thyristor control circuit, the resistor R5 and the capacitor C6 are connected in parallel between the cathode and gate of the thyristor VT3, the cathode of the thyristor VT3 is electrically connected to the thyristor control circuit, and the resistor R6 is connected in parallel between the cathode and gate of the thyristor VT3. The resistor R6 is electrically connected between the gate of the thyristor VT3 and another output end corresponding to the thyristor control circuit, the resistor R7 and the capacitor C7 are connected in parallel between the cathode and gate of the thyristor VT4, the cathode of the thyristor VT4 is electrically connected to an output end corresponding to the thyristor control circuit, the resistor R8 is electrically connected between the gate of the thyristor VT4 and another output end corresponding to the thyristor control circuit, the resistor R9 and the capacitor C8 are connected in parallel between the cathode and gate of the thyristor VT5, the cathode of the thyristor VT5 is electrically connected to an output end corresponding to the thyristor control circuit, and the resistor R10 is electrically connected between the thyristor The resistor R11 and the capacitor C9 are connected in parallel between the cathode and the gate of the thyristor VT6, the cathode of the thyristor VT6 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R12 is electrically connected between the gate of the thyristor VT6 and another output terminal corresponding to the thyristor control circuit, the resistor R13 and the capacitor C10 are connected in parallel between the cathode and the gate of the thyristor VT7, the cathode of the thyristor VT7 is electrically connected to an output terminal corresponding to the thyristor control circuit, and the resistor R14 is electrically connected between the gate of the thyristor VT7 and another output terminal corresponding to the thyristor control circuit.The resistor R15 and the capacitor C11 are connected in parallel between the cathode and the gate of the thyristor VT8, the cathode of the thyristor VT8 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R16 is electrically connected between the gate of the thyristor VT8 and another output terminal corresponding to the thyristor control circuit, the resistor R17 and the capacitor C12 are connected in parallel between the cathode and the gate of the thyristor VT9, the cathode of the thyristor VT9 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R18 is electrically connected between the gate of the thyristor VT9 and another output terminal corresponding to the thyristor control circuit, the resistor R19 and the capacitor C13 are connected in parallel between the cathode and the gate of the thyristor VT10, the cathode of the thyristor VT10 is electrically connected to the output terminal corresponding to the thyristor control circuit An output terminal is electrically connected, the resistor R20 is electrically connected between the gate of the thyristor VT10 and another output terminal corresponding to the thyristor control circuit, the resistor R21 and the capacitor C14 are connected in parallel between the cathode and gate of the thyristor VT11, the cathode of the thyristor VT11 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R22 is electrically connected between the gate of the thyristor VT11 and another output terminal corresponding to the thyristor control circuit, the resistor R23 and the capacitor C15 are connected in parallel between the cathode and gate of the thyristor VT12, the cathode of the thyristor VT12 is electrically connected to an output terminal corresponding to the thyristor control circuit, and the resistor R24 ​​is electrically connected between the gate of the thyristor VT12 and another output terminal corresponding to the thyristor control circuit. ,

[0031] By setting an RC filter circuit between the gate of each thyristor and the thyristor control circuit, the control signal output by the thyristor control circuit can be filtered to remove clutter and ensure the accuracy of the control signal.

[0032] Optionally, in one or more embodiments of the present invention, the three-phase input discrete rectification and battery access circuit also includes an RC peak absorption circuit, and the twelve input terminals and twelve output terminals of the RC peak absorption circuit are respectively electrically connected to the cathode and anode of the thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, thyristor VT6, thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11 and thyristor VT12.

[0033] By electrically connecting an RC peak absorption circuit between the cathode and anode of each thyristor, at the moment when the corresponding thyristor is turned off, the anti-peak voltage generated by it can form a charging circuit through the resistor and the capacitor, and the charging current controls the peak voltage within a certain range to prevent the thyristor from being broken down.

[0034] Specifically, in one or more embodiments of the present invention, the RC peak absorption circuit includes a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26 and a capacitor C27, the resistor R25 and the capacitor C16 are connected in series and in parallel between the anode and the cathode of the thyristor VT1, the resistor R26 and the capacitor C17 are connected in series and in parallel between the anode and the cathode of the thyristor VT2, the resistor R27 and the capacitor C18 are connected in series and in parallel between the anode and the cathode of the thyristor VT3, the resistor R28 and the capacitor C19 are connected in series and in parallel between the anode and the cathode of the thyristor VT3, between the anode and cathode of the thyristor VT4, the resistor R29 and the capacitor C20 are connected in series and in parallel between the anode and cathode of the thyristor VT5, the resistor R30 and the capacitor C21 are connected in series and in parallel between the anode and cathode of the thyristor VT6, the resistor R31 and the capacitor C22 are connected in series and in parallel between the anode and cathode of the thyristor VT7, the resistor R32 and the capacitor C23 are connected in series and in parallel between the anode and cathode of the thyristor VT8, the resistor R33 and the capacitor C24 are connected in series and in parallel between the anode and cathode of the thyristor VT9, the resistor R34 and the capacitor C25 are connected in series and in parallel between the anode and cathode of the thyristor VT10, the resistor R35 and the capacitor C26 are connected in series and in parallel between the anode and cathode of the thyristor VT11, and the resistor R36 and the capacitor C27 are connected in series and in parallel between the anode and cathode of the thyristor VT12.

[0035] In the embodiment of the present invention, each phase of the three-phase AC input independent full-wave rectifier shares the UPS neutral line, and the circuit topology design of the three-phase input discrete rectification and battery access circuit is novel and concise, and the performance is balanced, meeting the new technical requirements of high-power online uninterruptible power supply UPS power supply modules above 10KVA.

[0036] In one or more embodiments of the present invention, the thyristor control circuit includes twelve thyristor control sub-circuits, the input ends of the thyristor control sub-circuits are respectively electrically connected to the control signal output ends of the main controller, and the output ends of the thyristor control sub-circuits are respectively electrically connected to the corresponding input ends of the gate control input filter circuit.

[0037] By setting the thyristor control subcircuit, the corresponding thyristors can be driven to work through the control signals output by the main controller. In this way, when three-phase AC power is supplied, each phase is independently full-wave rectified and output to the UPS boost energy storage circuit. When the three-phase AC power is cut off, the battery can be connected to the UPS boost energy storage circuit and supply power to it.

[0038] like Figure 3 As shown, the figure only outputs the circuit schematic diagram of the thyristor control sub-circuit corresponding to the thyristor VT1. Since the principles and circuit connections of all twelve thyristor gate control sub-circuits are the same, they are not shown one by one in the present invention.

[0039] Specifically, in one or more embodiments of the present invention, the thyristor control subcircuit includes a transistor Q1, a transistor Q2, a resistor R37, a resistor R38, a capacitor C28, a MOS tube Q3, a diode D1, a diode D2, a resistor R39, a capacitor C29, a transformer T1, a diode D3, a resistor R40, a resistor R41, a capacitor C30 and a capacitor C31, the bases of the transistors Q1 and Q2 are electrically connected to the control signal output terminal of the main controller, and the transistors Q1 and Q2 are electrically connected to the control signal output terminal of the main controller. The collector of the transistor Q1 is electrically connected to the power supply +15V, the emitter of the transistor Q1 is electrically connected to the emitter of the transistor Q2, the collector of the transistor Q2 is grounded, the resistor R37 and the resistor R38 are connected in series between the emitter and the collector of the transistor Q2, the capacitor C28 is connected in parallel to both ends of the resistor R38, the common end of the resistor R37 and the resistor R38 is electrically connected to the gate of the MOS transistor Q3, the source of the MOS transistor Q3 is grounded, and the The drain of the MOS tube Q3 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the cathode of the diode D1, the anode of the diode D1 is electrically connected to the power supply +15V, the resistor R39 is connected in parallel to both ends of the diode D1, the capacitor C29 is electrically connected between the power supply +15V and the ground, the two ends of the primary coil of the transformer T1 are electrically connected to the anode of the diode D1 and the anode of the diode D2 respectively, one end of the secondary coil of the transformer T1 is electrically connected to the anode of the diode D3, the capacitor C30 is electrically connected between the cathode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R41 and the capacitor C31 are connected in series in sequence between the cathode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R40 is connected in parallel to both ends of the resistor R41, and the two ends of the capacitor C31 are electrically connected as output ends to the first input end corresponding to the gate control input filter circuit.

[0040] When the three-phase AC input power supply starts the positive half cycle of the three-phase AC sine wave, the main controller outputs high-level trigger signals CPU-1, CPU-2, and CPU-3 with a phase difference of 120 degrees, and controls thyristors VT1, thyristor VT2, and thyristor VT3 to turn on and work respectively; when the negative half cycle of the three-phase AC sine wave starts, thyristors VT1, thyristor VT2, and thyristor VT3 are cut off and do not work, and the main controller outputs high-level trigger signals CPU-4, CPU-5, and CPU-6 with a phase difference of 120 degrees to control thyristors VT4, thyristor VT5, and thyristor VT6 to turn on and work, and the three phases are independently full-wave rectified and output. When the three-phase AC power is off, the main controller outputs a high-level trigger signal CPU-7, and controls thyristors VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11, and thyristor VT12 to turn on and work, so that the battery is connected, which plays the function of an online UPS.

[0041] At present, high-power uninterruptible power supplies UPS above 10KVA generally use three-phase four-wire AC input, and three-phase AC often has imbalance. The online UPS three-phase input discrete rectification and battery access circuit of the present invention adopts independent full-wave rectification of each phase of the three-phase AC relative to the neutral line, and the working state of each phase of the three-phase AC is not affected by each other, making the rear-end high-power boost energy storage more reliable. Due to the modularization and online needs of UPS power supply, the battery is directly connected to the front end of the UPS three-phase rectification and boosting circuit, which is conducive to more balanced distribution of electric energy after each UPS module works in parallel. The circuit meets the technical requirements of this type of online UPS three-phase input discrete rectification and battery access circuit stipulated by the state, and has begun to be applied to the actual circuit of high-power uninterruptible power supply UPS module.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An online UPS three-phase input discrete rectification and battery access circuit, characterized in that: It includes an input filter circuit, a three-phase input discrete rectification and battery access circuit, a thyristor control circuit and a main controller, an external three-phase AC power is connected to the input end of the input filter circuit, the output end of the input filter circuit is electrically connected to the three-phase AC power input end of the three-phase input discrete rectification and battery access circuit, the output end of the three-phase input discrete rectification and battery access circuit is electrically connected to the input end of the UPS boost energy storage circuit, the output end of the battery is electrically connected to the battery input end of the three-phase input discrete rectification and battery access circuit, the control signal input circuit of the thyristor control circuit is electrically connected to the control signal output end of the main controller, and the control signal output circuit of the thyristor control circuit is electrically connected to the control signal input circuit of the three-phase input discrete rectification and battery access circuit; The three-phase input discrete rectification and battery access circuit includes a gate-controlled input filter circuit, a thyristor VT1, a thyristor VT2, a thyristor VT3, a thyristor VT4, a thyristor VT5, a thyristor VT6, a thyristor VT7, a thyristor VT8, a thyristor VT9, a thyristor VT10, a thyristor VT11 and a thyristor VT12, wherein the anode of the thyristor VT1 and the cathode of the thyristor VT4 are respectively electrically connected to the first output terminal corresponding to the input filter circuit, the cathode and the gate of the thyristor VT1 are respectively connected to the two first output terminals of the gate-controlled input filter circuit, and the cathode and the gate of the thyristor VT4 are respectively electrically connected to the two fourth output terminals of the gate-controlled input filter circuit. The anode of the thyristor VT2 and the cathode of the thyristor VT5 are respectively electrically connected to the second output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT2 are respectively electrically connected to the two second output terminals of the gate-controlled input filter circuit, the cathode and gate of the thyristor VT5 are respectively electrically connected to the two fifth output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT3 and the cathode of the thyristor VT6 are respectively electrically connected to the third output terminal corresponding to the input filter circuit, the cathode and gate of the thyristor VT3 are respectively electrically connected to the two third output terminals of the gate-controlled input filter circuit, the cathode and gate of the thyristor VT6 are respectively electrically connected to the two fifth output terminals of the gate-controlled input filter circuit. The sixth output terminal is electrically connected accordingly, the anodes of the thyristor VT7, the thyristor VT8, and the thyristor VT9 are electrically connected to the positive electrode of the battery respectively, the cathode of the thyristor VT7 and the cathode of the thyristor VT1 are electrically connected to the input terminal R+ of the UPS boost energy storage circuit respectively, the cathode and gate of the thyristor VT7 are electrically connected to the two seventh output terminals of the gate-controlled input filter circuit respectively, the cathode of the thyristor VT8 and the cathode of the thyristor VT2 are electrically connected to the input terminal S+ of the UPS boost energy storage circuit respectively, the cathode and gate of the thyristor VT8 are electrically connected to the two eighth output terminals of the gate-controlled input filter circuit respectively, the cathode of the thyristor VT9 is electrically connected to the cathode of the thyristor VT3 The cathodes of the thyristor VT10, thyristor VT11 and thyristor VT12 are respectively electrically connected to the negative electrode of the battery, the anode of the thyristor VT10 and the anode of the thyristor VT4 are respectively electrically connected to the input terminal R- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT10 are respectively electrically connected to the two tenth output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT11 and the anode of the thyristor VT5 are respectively electrically connected to the input terminal S- of the UPS boost energy storage circuit,The cathode and gate of the thyristor VT11 are respectively electrically connected to the two eleventh output terminals of the gate-controlled input filter circuit, the anode of the thyristor VT12 and the anode of the thyristor VT6 are respectively electrically connected to the input terminal T- of the UPS boost energy storage circuit, the cathode and gate of the thyristor VT12 are respectively electrically connected to the two twelfth output terminals of the gate-controlled input filter circuit, and the input terminals of the gate-controlled input filter circuit are respectively electrically connected to the corresponding output terminals of the thyristor control circuit; The thyristor control circuit comprises twelve thyristor control sub-circuits, the input ends of the thyristor control sub-circuits are respectively electrically connected to the control signal output ends of the main controller, and the output ends of the thyristor control sub-circuits are respectively electrically connected to the input ends corresponding to the gate control input filter circuit; The thyristor control subcircuit includes a transistor Q1, a transistor Q2, a resistor R37, a resistor R38, a capacitor C28, a MOS tube Q3, a diode D1, a diode D2, a resistor R39, a capacitor C29, a transformer T1, a diode D3, a resistor R40, a resistor R41, a capacitor C30 and a capacitor C31. The bases of the transistors Q1 and Q2 are electrically connected to the control signal output end of the main controller, and the collector of the transistor Q1 is connected to the power supply +15V The emitter of the transistor Q1 is electrically connected to the emitter of the transistor Q2, the collector of the transistor Q2 is grounded, the resistor R37 and the resistor R38 are connected in series between the emitter and the collector of the transistor Q2, the capacitor C28 is connected in parallel at both ends of the resistor R38, the common end of the resistor R37 and the resistor R38 is electrically connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is grounded, and the drain of the MOS tube Q3 is connected to the drain of the MOS tube Q3. The positive electrode of the diode D2 is electrically connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is electrically connected to the negative electrode of the diode D1, the positive electrode of the diode D1 is electrically connected to the power supply +15V, the resistor R39 is connected in parallel to the two ends of the diode D1, the capacitor C29 is electrically connected between the power supply +15V and the ground, the two ends of the primary coil of the transformer T1 are electrically connected to the positive electrode of the diode D1 and the positive electrode of the diode D2 respectively, one end of the secondary coil of the transformer T1 is electrically connected to the positive electrode of the diode D3, the capacitor C30 is electrically connected between the negative electrode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R41 and the capacitor C31 are connected in series in sequence between the negative electrode of the diode D3 and the other end of the secondary coil of the transformer T1, the resistor R40 is connected in parallel to the two ends of the resistor R41, and the two ends of the capacitor C31 are electrically connected as output ends to the first input end corresponding to the gate control input filter circuit.

2. The online UPS three-phase input discrete rectification and battery access circuit according to claim 1 is characterized in that: The input filter circuit includes a fuse F1, a fuse F2, a fuse F3, an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2 and a capacitor C3. The fuse F1, the inductor L1 and the capacitor C1 are sequentially connected in series between the R phase of the external three-phase AC power supply and the neutral line, and the inductor L1 and the capacitor C1 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit. The fuse F2, the inductor L2 and the capacitor C2 are sequentially connected in series between the S phase of the external three-phase AC power supply and the neutral line, and the inductor L2 and the capacitor C2 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit. The fuse F3, the inductor L3 and the capacitor C3 are sequentially connected in series between the T phase of the external three-phase AC power supply and the neutral line, and the inductor L3 and the capacitor C3 are electrically connected to the corresponding three-phase AC power input terminal of the three-phase input discrete rectification and battery access circuit.

3. The online UPS three-phase input discrete rectification and battery access circuit according to claim 1, characterized in that: The gate control input filter circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15. The resistor R1 and the capacitor C4 are connected in parallel between the cathode and the gate of the thyristor VT1. The cathode of the thyristor VT1 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R2 is electrically connected between the gate of the thyristor VT1 and another output terminal corresponding to the thyristor control circuit, the resistor R3 and the capacitor C5 are connected in parallel between the cathode and gate of the thyristor VT2, the cathode of the thyristor VT2 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R4 is electrically connected between the gate of the thyristor VT2 and another output terminal corresponding to the thyristor control circuit, the resistor R5 and the capacitor C6 are connected in parallel between the cathode and gate of the thyristor VT3, the cathode of the thyristor VT3 is electrically connected to an output terminal corresponding to the thyristor control circuit, and the resistor R6 is connected in parallel between the cathode and gate of the thyristor VT3. The resistor R6 is electrically connected between the gate of the thyristor VT3 and another output terminal corresponding to the thyristor control circuit. The resistor R7 and the capacitor C7 are connected in parallel between the cathode and gate of the thyristor VT4. The cathode of the thyristor VT4 is electrically connected to an output terminal corresponding to the thyristor control circuit. The resistor R8 is electrically connected between the gate of the thyristor VT4 and another output terminal corresponding to the thyristor control circuit. The resistor R9 and the capacitor C8 are connected in parallel between the cathode and gate of the thyristor VT5. The cathode of the thyristor VT5 is electrically connected to an output terminal corresponding to the thyristor control circuit. The resistor R10 is electrically connected to the gate of the thyristor VT5. The resistor R11 and the capacitor C9 are connected in parallel between the cathode and the gate of the thyristor VT6, the cathode of the thyristor VT6 is electrically connected to an output end corresponding to the thyristor control circuit, the resistor R12 is electrically connected between the gate of the thyristor VT6 and another output end corresponding to the thyristor control circuit, the resistor R13 and the capacitor C10 are connected in parallel between the cathode and the gate of the thyristor VT7, the cathode of the thyristor VT7 is electrically connected to an output end corresponding to the thyristor control circuit, the resistor R14 is electrically connected between the gate of the thyristor VT7 and another output end corresponding to the thyristor control circuit,The resistor R15 and the capacitor C11 are connected in parallel between the cathode and the gate of the thyristor VT8, the cathode of the thyristor VT8 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R16 is electrically connected between the gate of the thyristor VT8 and another output terminal corresponding to the thyristor control circuit, the resistor R17 and the capacitor C12 are connected in parallel between the cathode and the gate of the thyristor VT9, the cathode of the thyristor VT9 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R18 is electrically connected between the gate of the thyristor VT9 and another output terminal corresponding to the thyristor control circuit, the resistor R19 and the capacitor C13 are connected in parallel between the cathode and the gate of the thyristor VT10, the cathode of the thyristor VT10 is electrically connected to the output terminal corresponding to the thyristor control circuit An output terminal is electrically connected, the resistor R20 is electrically connected between the gate of the thyristor VT10 and another output terminal corresponding to the thyristor control circuit, the resistor R21 and the capacitor C14 are connected in parallel between the cathode and gate of the thyristor VT11, the cathode of the thyristor VT11 is electrically connected to an output terminal corresponding to the thyristor control circuit, the resistor R22 is electrically connected between the gate of the thyristor VT11 and another output terminal corresponding to the thyristor control circuit, the resistor R23 and the capacitor C15 are connected in parallel between the cathode and gate of the thyristor VT12, the cathode of the thyristor VT12 is electrically connected to an output terminal corresponding to the thyristor control circuit, and the resistor R24 ​​is electrically connected between the gate of the thyristor VT12 and another output terminal corresponding to the thyristor control circuit. , 4. The online UPS three-phase input discrete rectification and battery access circuit according to claim 1, characterized in that: The three-phase input discrete rectification and battery access circuit also includes an RC peak absorption circuit, and the twelve input ends and twelve output ends of the RC peak absorption circuit are respectively electrically connected to the cathode and anode of the thyristor VT1, thyristor VT2, thyristor VT3, thyristor VT4, thyristor VT5, thyristor VT6, thyristor VT7, thyristor VT8, thyristor VT9, thyristor VT10, thyristor VT11 and thyristor VT12.

5. The online UPS three-phase input discrete rectification and battery access circuit according to claim 4, characterized in that: The RC peak absorption circuit includes a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26 and a capacitor C27. The resistor R25 and the capacitor C16 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT1. The resistor R26 and the capacitor C17 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT2. The resistor R27 and the capacitor C18 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT3. The resistor R28 and the capacitor C19 are connected in series and then connected in parallel between the anode and the cathode of the thyristor VT4. and cathode, the resistor R29 and the capacitor C20 are connected in series and in parallel between the anode and cathode of the thyristor VT5, the resistor R30 and the capacitor C21 are connected in series and in parallel between the anode and cathode of the thyristor VT6, the resistor R31 and the capacitor C22 are connected in series and in parallel between the anode and cathode of the thyristor VT7, the resistor R32 and the capacitor C23 are connected in series and in parallel between the anode and cathode of the thyristor VT8, the resistor R33 and the capacitor C24 are connected in series and in parallel between the anode and cathode of the thyristor VT9, the resistor R34 and the capacitor C25 are connected in series and in parallel between the anode and cathode of the thyristor VT10, the resistor R35 and the capacitor C26 are connected in series and in parallel between the anode and cathode of the thyristor VT11, and the resistor R36 and the capacitor C27 are connected in series and in parallel between the anode and cathode of the thyristor VT12.

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