Three-phase zero-line-free high-power power supply AC-DC topology structure

Abstract

The application discloses a three-phase non-zero-line high-power power supply AC-DC topology structure, which comprises a control module, the control module comprises a plurality of resistors, a plurality of connectors, an operational amplifier and a switching switch, one end of a resistor R4 in the plurality of resistors is connected with a power supply, and the other end of the resistor R4 is connected with one end of a resistor R3; the other end of the resistor R3 is connected with one end of a resistor R2, a same-phase end of the operational amplifier U1 and an I N1 end; one end of a resistor R1 is connected with the other end of the resistor R2; an opposite-phase end of the operational amplifier U1 is connected with a common end of the switching switch S1, and an output end is connected with a positive electrode of the switching switch S1; one end of a resistor R9 and an end of a connector P1 are connected with a first end of the switching switch S1, one end of a resistor R10 and an end of a connector P2 are connected with a second end of the switching switch S1; the other end of the resistor R1, the other end of the resistor R9, the other end of the resistor R10 and a negative electrode of the switching switch S1 are grounded.

Description

Technical Field

[0001] This invention relates to the field of power conversion technology, and in particular to a three-phase high-power AC-DC topology without a neutral wire. Background Technology

[0002] Three-phase AC power is rectified to form a DC bus voltage. Due to the different electrical parameters of the target application scenarios, when configuring the downstream circuits, either a boost circuit or a buck circuit is selected based on the required voltage of the target application scenario. However, in scenarios with multiple voltage requirements, it is necessary to redundantly configure independent DC-DC modules and duty cycle adjustment modules. This approach increases the cost and size of the entire system. Therefore, a three-phase high-power AC-DC topology without a neutral wire is proposed, which can automatically determine and select the operation of the boost / buck module. By sharing the adjustment modules, the duty cycle of the adjustment signal of the boost / buck module is automatically adjusted based on the selection. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this invention is to provide a three-phase high-power AC-DC topology without a neutral wire, including a control module. The control module comprises several resistors, several connectors, an operational amplifier, and a switching switch. One end of resistor R4 is connected to the power supply, and the other end is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R2, the non-inverting input of operational amplifier U1, and the IN1 input. The other end of resistor R2 is connected to one end of resistor R1. The inverting input of operational amplifier U1 is connected to the common terminal of switching switch S1, and its output terminal is connected to the positive terminal of switching switch S1. The first terminal of switching switch S1 is connected to one end of resistor R9 and the P1 connector, and the second terminal is connected to one end of resistor R10 and the P2 connector. The other ends of resistors R1, R9, and R10, and the negative terminal of switching switch S1 are grounded.

[0004] Furthermore, the control module also includes several operational amplifiers, several connectors, several diodes, NAND gates, and resistors. Among the several operational amplifiers, the non-inverting input of operational amplifier U3 is connected to one end of resistor R3, the inverting input is connected to the non-inverting input of operational amplifier U2, one end of resistor R5, the cathode of diode D7, and the cathode of diode D8, and the output is connected to the first input of NAND gate U5; the inverting input of operational amplifier U2 is connected to one end of resistor R1, and the output is connected to the second input of NAND gate U5; the anode of diode D7 is connected to the P5 terminal of connector; the anode of diode D8 is connected to the P6 terminal of connector; and the other end of resistor R5 is grounded.

[0005] Furthermore, the control module also includes several relays, several resistors, several connectors, and NOT gates. One end of relay S2 is connected to the output terminal of NOT gate U4, and the other end is connected to one end of resistor R7 and connector P4. Its positive terminal is connected to the positive terminal of relay S3 and the output terminal of NAND gate U5. One end of relay S3 is connected to the input terminal of NOT gate U4 and the output terminal of operational amplifier U1, and the other end is connected to one end of resistor R6 and connector P3. The other ends of resistor R6, resistor R7, the negative terminal of relay S2, and the negative terminal of relay S3 are grounded.

[0006] Furthermore, it also includes a rectifier module, which includes a plurality of diodes. The cathodes of diodes D1, D3, and D5 are connected to the OUT1 terminal; the anodes of diodes D1 and D2 are connected to phase A of the power supply; the anodes of diodes D3 and D4 are connected to phase B of the power supply; the anodes of diodes D5 and D6 are connected to phase C of the power supply; and the anodes of diodes D2, D4, and D6 are grounded.

[0007] Furthermore, the rectifier module also includes a capacitor and a resistor. One end of the capacitor C1 and one end of the resistor R8 are connected to the OUT1 terminal; the other end of the capacitor C1 and the other end of the resistor R8 are grounded.

[0008] Furthermore, it also includes an adjustment module, a boost module, and a buck module. The adjustment module is connected to the boost module, the buck module, and the control module. The buck module is connected to the control module, and the boost module is connected to the control module.

[0009] The advantages of this invention compared to the prior art are:

[0010] This invention can automatically determine and select the operation of the boost / buck module, and automatically adjust the duty cycle of the boost / buck module adjustment signal based on the selection by adjusting the shared module. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the control module provided by the present invention.

[0014] Figure 3 This is a schematic diagram of the rectifier module provided by the present invention. Detailed Implementation

[0015] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0016] This invention discloses a three-phase high-power AC-DC topology without a neutral wire, including a control module. The control module includes several resistors, several connectors, an operational amplifier, and a switching switch. One end of resistor R4 is connected to the power supply, and the other end is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R2, the non-inverting input of operational amplifier U1, and the IN1 input. The other end of resistor R2 is connected to one end of resistor R1. The inverting input of operational amplifier U1 is connected to the common terminal of switching switch S1, and the output terminal is connected to the positive terminal of switching switch S1. The first end of switching switch S1 is connected to one end of resistor R9 and the P1 connector, and the second end is connected to one end of resistor R10 and the P2 connector. The other ends of resistors R1, R9, and R10, and the negative terminal of switching switch S1 are grounded.

[0017] like Figure 2 As shown, specifically, the control module further includes several operational amplifiers, several connectors, several diodes, NAND gates, and resistors. Among the several operational amplifiers, the non-inverting input of operational amplifier U3 is connected to one end of resistor R3, the inverting input is connected to the non-inverting input of operational amplifier U2, one end of resistor R5, the cathode of diode D7, and the cathode of diode D8, and the output is connected to the first input of NAND gate U5; the inverting input of operational amplifier U2 is connected to one end of resistor R1, and the output is connected to the second input of NAND gate U5; the anode of diode D7 is connected to the P5 terminal of connector; the anode of diode D8 is connected to the P6 terminal of connector; and the other end of resistor R5 is grounded.

[0018] like Figure 2 As shown, specifically, the control module further includes several relays, several resistors, several connectors, and NOT gates. One end of relay S2 is connected to the output terminal of NOT gate U4, and the other end is connected to one end of resistor R7 and connector P4. Its positive terminal is connected to the positive terminal of relay S3 and the output terminal of NAND gate U5. One end of relay S3 is connected to the input terminal of NOT gate U4 and the output terminal of operational amplifier U1, and the other end is connected to one end of resistor R6 and connector P3. The other end of resistor R6, the other end of resistor R7, the negative terminal of relay S2, and the negative terminal of relay S3 are grounded.

[0019] like Figure 3As shown, specifically, it also includes a rectifier module, which includes a plurality of diodes. The cathodes of diodes D1, D3, and D5 are connected to the OUT1 terminal; the anodes of diodes D1 and D2 are connected to phase A of the power supply; the anodes of diodes D3 and D4 are connected to phase B of the power supply; the anodes of diodes D5 and D6 are connected to phase C of the power supply; and the anodes of diodes D2, D4, and D6 are grounded.

[0020] like Figure 3 As shown, specifically, the rectifier module also includes a capacitor and a resistor. One end of the capacitor C1 and one end of the resistor R8 are connected to the OUT1 terminal; the other end of the capacitor C1 and the other end of the resistor R8 are grounded.

[0021] like Figure 1 As shown, specifically, it also includes an adjustment module, a boost module, and a buck module. The adjustment module is connected to the boost module, the buck module, and the control module. The buck module is connected to the control module, and the boost module is connected to the control module.

[0022] See Figure 3 , Figure 2Diodes D1, D2, D3, D4, D5, and D6 form a three-phase rectifier module. Each phase of the three-phase power is connected between the anode of diode D1 and the cathode of diode D2, between the anode of diode D3 and the cathode of diode D4, and between the anode of diode D5 and the cathode of diode D6, respectively. Capacitor C1 filters the signal at resistor R8 to produce a pulsating DC signal after three-phase rectification. This signal is fed back to the control module IN1 via OUT1. The topology also includes an adjustment module, a boost module, and a buck module. The power signal passes through resistors R4, R3, R2, and R1 to the ground terminal. The signal amplitude between resistors R2 and R3 is the reference signal required by the load; the signal amplitude between resistors R1 and R2 is the lower limit of this reference signal; and the signal amplitude between resistors R3 and R4 is the upper limit of this reference signal. Adjusting the resistance values ​​of resistors R1, R2, R3, and R4 sets... The reference signal and its threshold range are set. The signal at resistor R2 is fed back to the non-inverting input of op-amp U1, and the signal at IN1 is fed back to the inverting input of op-amp U1 and the common input of switch S1. When the reference signal is lower than the IN1 signal, op-amp U1 outputs, and the output signal of op-amp U1 is fed back to the positive terminal of switch S1. The second channel of switch S1 is cut off, and the first channel of switch S1 is turned on. The IN1 signal goes to the ground terminal through switch S1 and resistor R9. The signal at resistor R9 is fed back to the power signal input terminal of the boost module through connector P1. When the reference signal is higher than the IN1 signal, op-amp U1 is cut off, the first channel of switch S1 is cut off, and the second channel of switch S1 is turned on. The IN1 signal goes to the ground terminal through switch S1 and resistor R10. The signal at resistor R10 is fed back to the power signal input terminal of the buck module through connector P2. Based on the set reference signal, the operation of the boost / buck module is automatically determined and selected.

[0023] See Figure 2The boost and buck modules share a common regulating module. When the boost / buck module receives a signal from connector P1 / connector P2, it adjusts the voltage of its own power output signal based on the duty cycle of the signal from the regulating module. The initial duty cycle of the regulating module's output signal is set on the regulating module. The regulating module's output signal is synchronously fed back to the regulating signal input terminals of both the boost and buck modules. The boost module's output signal is synchronously fed back to connector P5, and the signal at connector P5 passes through diode D7 and resistor R5 to ground. The buck module's output signal is synchronously fed back to connector P6, and the signal at connector P6 passes through diode D8 and resistor R5 to ground. The signal is fed back to the non-inverting input of op-amp U2 and the inverting input of op-amp U3. The signal at resistor R1 is fed back to the inverting input of op-amp U2, and the signal at resistor R3 is fed back to the non-inverting input of op-amp U3. When the actual power signal output by the boost / buck module is outside the set threshold range of the reference signal, one of op-amps U3 or U2 outputs (op-amp U2 outputs when the actual power signal amplitude is higher than the signal at resistor R3, and op-amp U3 outputs when it is lower than the signal at resistor R1). The output signal of op-amp U3 is fed back to the first input of NAND gate U5, and the output signal of op-amp U2 is fed back to the second input of NAND gate U5. At this time, NAND gate U5 outputs. When the actual power signal output by the boost / buck module is within the set threshold range of the reference signal... When both operational amplifiers U3 and U2 are outputting, NAND gate U5 is cut off. The signal from the output of NAND gate U5 is fed back to the positive terminals of relays S2 and S3. When NAND gate U5 outputs, relays S2 and S3 are turned on, and the signal from the output of operational amplifier U1 is synchronously fed back to the input of NOT gate U4. When operational amplifier U1 outputs, the output of NOT gate U4 is low, and vice versa. When operational amplifier U1 outputs, the signal from its output goes through relay S3 and resistor R6 to ground. The signal from resistor R6 is fed back to the adjustment module through connector P3. The signal from resistor R6 is an up-adjustment signal. When the adjustment module receives the up-adjustment signal feedback, it increases the duty cycle of its own output signal. When 1 is cut off, the output of NOT gate U4 is high. The signal from the output of NOT gate U4 goes to ground via relay S2 and resistor R7. The signal from resistor R7 is fed back to the adjustment module via connector P4. The signal from resistor R7 is a down-adjustment signal. When the adjustment module receives the down-adjustment signal feedback, it lowers the duty cycle of its own output signal. When the boost module / buck module adjusts its own output voltage signal accordingly based on the duty cycle of the adjustment module's output signal, the non-inverting input of operational amplifier U2 changes accordingly. When the actual power supply signal output by the boost module / buck module is within the set threshold range of the reference signal, NAND gate U5 is cut off, the adjustment module loses the signal feedback from connectors P3 / P4, and the adjustment module stops adjusting the duty cycle.This allows the boost and buck modules to automatically adjust the duty cycle of their adjustment signals based on the selected operating mode, through a shared adjustment module.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A three-phase non-zero line high power supply AC-DC topology, characterized in that, The system includes an adjustment module, a boost module, a buck module, and a control module. The adjustment module is connected to the boost module, buck module, and control module. The buck module is connected to the control module, and the boost module is connected to the control module. The control module includes resistors R1 to R7, resistor R9, resistor R10, connectors P1 to P6, operational amplifiers U1 to U3, a switch S1, diodes D7 and D8, NAND gate U5, NOT gate U4, relays S2 and S3. One end of resistor R4 is connected to the power supply, and the other end is connected to... One end of resistor R3; the other end of resistor R3 is connected to one end of resistor R2 and the non-inverting input of operational amplifier U1; the other end of resistor R2 is connected to one end of resistor R1; the inverting input of operational amplifier U1 is connected to the common terminal and IN1 terminal of switch S1, and the output terminal is connected to the positive terminal of switch S1; the first terminal of switch S1 is connected to one end of resistor R9 and connector P1, and the second terminal is connected to one end of resistor R10 and connector P2; the other ends of resistor R1, resistor R9, and resistor R10, and the negative terminal of switch S1 are grounded; the non-inverting input of operational amplifier U3 is connected to one end of resistor R3, and the inverting input is connected to... The non-inverting input of op-amp U2, one end of resistor R5, the cathodes of diodes D7 and D8, and its output are connected to the first input of NAND gate U5. The inverting input of op-amp U2 is connected to one end of resistor R1, and its output is connected to the second input of NAND gate U5. The anode of diode D7 is connected to connector P5; the anode of diode D8 is connected to connector P6; the other end of resistor R5 is grounded. One end of relay S2 is connected to the output of NOT gate U4, and the other end is connected to one end of resistor R7 and connector P4. Its positive terminal is connected to the positive terminal of relay S3 and the output of NAND gate U5. One end of relay S3 is connected to the NAND gate U5. The input terminal of gate U4 and the output terminal of operational amplifier U1 are connected to one end of resistor R6 and the connector P3. The other end of resistor R6, the other end of resistor R7, the negative terminal of relay S2, and the negative terminal of relay S3 are grounded. The boost module receives the signal fed back from connector P1, and the buck module receives the signal fed back from connector P2. The up-adjustment signal is fed back to the adjustment module through connector P3, and the down-adjustment signal is fed back to the adjustment module through connector P4. The output signal of the boost module is synchronously fed back to connector P5, and the output signal of the buck module is synchronously fed back to connector P6.

2. The three-phase high-power AC-DC topology without neutral wire according to claim 1, characterized in that, It also includes a rectifier module, which includes diodes D1 to D6. The cathodes of diodes D1, D3, and D5 are connected to the OUT1 terminal; the anodes of diodes D1 and D2 are connected to phase A of the power supply; the anodes of diodes D3 and D4 are connected to phase B of the power supply; the anodes of diodes D5 and D6 are connected to phase C of the power supply; and the anodes of diodes D2, D4, and D6 are grounded.

3. The three-phase high-power AC-DC topology without neutral wire according to claim 2, characterized in that, The rectifier module also includes a capacitor C1 and a resistor R8. One end of the capacitor C1 and one end of the resistor R8 are connected to the OUT1 terminal; the other end of the capacitor C1 and the other end of the resistor R8 are grounded.

Images