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

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of power conversion, and in particular to a three-phase neutral-line-free high-power AC-DC topology structure. Background Art

[0002] After rectification, three-phase AC power forms a DC bus voltage. Due to the different electrical parameters of the target application scenarios, when configuring the lower-level circuits, a boost circuit or a buck circuit will be selected based on the required voltage of the target application scenario. However, in scenarios with multiple voltage requirements, independent DC-DC modules and duty cycle adjustment modules need to be redundantly configured, which increases the cost and volume of the entire system. Therefore, a three-phase, neutral-line-free, high-power AC-DC power supply topology is proposed. The structure 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 sharing the adjustment module. Summary of the Invention

[0003] In response to the above technical problems, the purpose of the present invention is to provide a three-phase non-neutral high-power power supply AC-DC topology structure, including a control module, wherein the control module includes several resistors, several connectors, an operational amplifier, and a switching switch, wherein one end of the resistor R4 among the several resistors is connected to the power supply, and the other end is connected to one end of the resistor R3; the other end of the resistor R3 is connected to one end of the resistor R2, the non-inverting end of the operational amplifier U1, and the IN1 end; the other end of the resistor R2 is connected to one end of the resistor R1; the inverting end of the operational amplifier U1 is connected to the common end of the switching switch S1, and the output end is connected to the positive pole of the switching switch S1; the first end of the switching switch S1 is connected to one end of the resistor R9 and the connector P1 end, and the second end is connected to one end of the resistor R10 and the connector P2 end; the other end of the resistor R1, the other end of the resistor R9, the other end of the resistor R10, and the negative pole of the switching switch S1 are grounded.

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

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

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

[0007] Furthermore, the rectifier module further 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 a regulating module, a boost module, and a buck module. The regulating 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 beneficial effects of the present invention compared with the prior art are:

[0010] The present invention can automatically judge and select the operation of the boost / buck module, and automatically adjust the duty cycle of the boost / buck module regulation signal based on the selection in a shared manner of the regulation module. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction is given below to the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] Figure 1 This is a schematic diagram of the overall structure provided by 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 DESCRIPTION

[0015] In order to make the objects and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of the present invention and does not strictly limit the scope of protection specifically requested by the present invention.

[0016] The present invention discloses a three-phase non-neutral-line high-power AC-DC topology structure, including a control module, wherein the control module includes a plurality of resistors, a plurality of connectors, an operational amplifier, and a switching switch. One end of a resistor R4 among the plurality of resistors is connected to a power supply, and the other end is connected to one end of a resistor R3; the other end of the resistor R3 is connected to one end of a resistor R2, a non-inverting end of an operational amplifier U1, and an IN1 end; the other end of the resistor R2 is connected to one end of a resistor R1; the inverting end of the operational amplifier U1 is connected to a common end of a switching switch S1, and the output end is connected to the positive electrode of the switching switch S1; a first end of the switching switch S1 is connected to one end of a resistor R9 and a connector P1 end, and a second end is connected to one end of a resistor R10 and a connector P2 end; the other end of the resistor R1, the other end of the resistor R9, the other end of the resistor R10, and the negative electrode of the switching switch S1 are grounded.

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

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

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

[0020] like Figure 3 As shown, specifically, the rectifier module further 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 a regulating module, a boost module, and a buck module. The regulating 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 2, diode D1, diode D2, diode D3, diode D4, diode D5, and diode D6 form a three-phase rectifier module. Each of the three-phase electricity 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. Capacitor C1 performs filtering so that the signal at the end of resistor R8 is a pulsating DC signal after three-phase rectification. The signal is fed back to the control module IN1 through OUT1. A regulation module, a boost module, and a buck module are also provided in the topology structure. The power supply signal passes through resistor R4, resistor R3, resistor R2, and resistor R1 to the ground terminal. The signal amplitude between resistor R2 and resistor R3 is the reference signal required by the load, the signal amplitude between resistor R1 and resistor R2 is the set lower limit value of the reference signal, and the signal amplitude between resistor R3 and resistor R4 is the set upper limit value of the reference signal. Adjust the resistance value of resistor R1, resistor R2, resistor R3, and resistor R4 to set the value. A reference signal and a set threshold range for the signal are set. The signal at the resistor R2 end is fed back to the non-inverting end of the operational amplifier U1, and the signal at the IN1 end is fed back to the inverting end of the operational amplifier U1 and the common input end of the switching switch S1. When the reference signal is lower than the signal at the IN1 end, the operational amplifier U1 outputs, and the signal at the output end of the operational amplifier U1 is fed back to the positive pole of the switching switch S1. The second channel of the switching switch S1 is cut off, and the first channel of the switching switch S1 is turned on. The signal at the IN1 end is connected to the ground end through the switching switch S1 and the resistor R9. The signal at the resistor R9 end is fed back to the power signal input end of the boost module through the connector P1. When the reference signal is higher than the signal at the IN1 end, the operational amplifier U1 is cut off, the first channel of the switching switch S1 is cut off, and the second channel of the switching switch S1 is turned on. The signal at the IN1 end is connected to the ground end through the switching switch S1 and the resistor R10. The signal at the resistor R10 end is fed back to the power signal input end of the buck module through the connector P2. In this way, the operation of the boost / buck module is automatically judged and selected based on the set reference signal.

[0023] See Figure 2The boost module and the buck module share a regulation module. When the boost module / buck module obtains the signal fed back by the connector P1 / connector P2, the boost module / buck module adjusts the voltage of the signal at the power output end of its own module based on the duty cycle of the signal fed back by the regulation module. The initial duty cycle of the output signal of the regulation module is set on the regulation module. The output signal of the regulation module is synchronously fed back to the regulation signal input end of the boost module and the buck module. The output signal of the boost module is synchronously fed back to the connector P5. The signal at the connector P5 is connected to the ground end through the diode D7 and the resistor R5. The output signal of the buck module is synchronously fed back to the connector P6. The signal at the connector P6 is connected to the ground end through the diode D8 and the resistor R5. The resistor R5 is connected to the ground end. The signal is fed back to the non-inverting terminal of the operational amplifier U2 and the inverting terminal of the operational amplifier U3, the signal at the resistor R1 terminal is fed back to the inverting terminal of the operational amplifier U2, and the signal at the resistor R3 terminal is fed back to the non-inverting terminal of the operational amplifier U3. When the actual power signal output by the boost module / buck module is outside the set threshold range of the reference signal, one of the outputs of the operational amplifier U3 / op amp U2 (when the actual power signal amplitude is higher than the signal at the resistor R3 terminal, the operational amplifier U2 outputs, and when it is lower than the signal at the resistor R1 terminal, the operational amplifier U3 outputs), the output signal of the operational amplifier U3 is fed back to the first input terminal of the NAND gate U5, the output signal of the operational amplifier U2 is fed back to the second input terminal of the NAND gate U5, and at this time the NAND gate U5 outputs. When the actual power signal output by the boost module / buck module is within the set threshold range of the reference signal When the NAND gate U5 is turned on, the operational amplifier U3 and the operational amplifier U2 both output. At this time, the NAND gate U5 is cut off, and the output signal of the NAND gate U5 is fed back to the positive pole of the relay S2 and the positive pole of the relay S3. When the NAND gate U5 outputs, the relay S2 is turned on and the relay S3 is turned on. The output signal of the operational amplifier U1 is synchronously fed back to the input of the NOT gate U4. When the operational amplifier U1 outputs, the output of the NOT gate U4 outputs a low level. On the contrary, the output of the NOT gate U4 is a high level. When the operational amplifier U1 outputs, the output signal of the operational amplifier U1 is fed back to the ground through the relay S3 and the resistor R6. The signal at the resistor R6 end is fed back to the adjustment module through the connector P3. The signal at the resistor R6 end is an upward signal. When the adjustment module obtains the upward signal feedback, it increases the signal duty cycle of its own output end. When the operational amplifier U1 outputs, the output signal of the operational amplifier U1 is fed back to the ground through the relay S3 and the resistor R6 end. 1 is cut off, the output end of the NOT gate U4 is high level, and the output end signal of the NOT gate U4 is connected to the ground end through the relay S2 and the resistor R7. The signal at the resistor R7 end is fed back to the regulation module through the connector P4. The signal at the resistor R7 end is a downward adjustment signal. When the regulation module obtains the downward adjustment signal feedback, it adjusts the duty cycle of the signal at its own output end. When the boost module / buck module adjusts its own output end voltage signal accordingly based on the duty cycle of the output end signal of the regulation module, the non-inverting end of the 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, the NAND gate U5 is cut off, the regulation module loses the signal feedback from the connector P3 / connector P4 end, and the regulation module stops duty cycle adjustment.In this way, the boost module and the buck module can automatically adjust the duty cycle of the boost / buck module regulation signal based on the selection of the working mode by sharing the regulation 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A three-phase high-power AC-DC power supply without a neutral line topology, characterized in that: The control module includes a control module, which includes several resistors, several connectors, an operational amplifier, and a switching switch. One end of the resistor R4 among the several resistors is connected to the power supply, and the other end is connected to one end of the resistor R3; the other end of the resistor R3 is connected to one end of the resistor R2, the non-inverting end of the operational amplifier U1, and the IN1 end; the other end of the resistor R2 is connected to one end of the resistor R1; the inverting end of the operational amplifier U1 is connected to the common end of the switching switch S1, and the output end is connected to the positive pole of the switching switch S1; the first end of the switching switch S1 is connected to one end of the resistor R9 and the connector P1 end, and the second end is connected to one end of the resistor R10 and the connector P2 end; the other end of the resistor R1, the other end of the resistor R9, the other end of the resistor R10, and the negative pole of the switching switch S1 are grounded.

2. The three-phase non-neutral line high-power AC-DC topology structure according to claim 1 is characterized in that: The control module also includes several operational amplifiers, several connectors, several diodes, NAND gates, and resistors. Among the operational amplifiers, the operational amplifier U3 is connected to one end of the resistor R3 in the same phase, and the inverting end is connected to the non-inverting end of the operational amplifier U2, one end of the resistor R5, the cathode of the diode D7, and the cathode of the diode D8, and the output end is connected to the first input end of the NAND gate U5; the operational amplifier U2 is connected to one end of the resistor R1 in the inverting phase, and the output end is connected to the second input end of the NAND gate U5; the anode of the diode D7 is connected to the end of the connector P5; the anode of the diode D8 is connected to the end of the connector P6; and the other end of the resistor R5 is grounded.

3. The three-phase non-neutral line high-power AC-DC topology structure according to claim 2 is characterized in that: The control module also includes several relays, several resistors, several connectors, and a NOT gate. One end of the relay S2 among the several relays is connected to the output end of the NOT gate U4, and the other end is connected to one end of the resistor R7 and the end of the connector P4. The positive pole is connected to the positive pole of the relay S3 and the output end of the NAND gate U5; one end of the relay S3 is connected to the input end of the NOT gate U4 and the output end of the operational amplifier U1, and the other end is connected to one end of the resistor R6 and the end of the connector P3; the other end of the resistor R6, the other end of the resistor R7, the negative pole of the relay S2, and the negative pole of the relay S3 are grounded.

4. The three-phase non-neutral-line high-power AC-DC topology structure according to claim 1 is characterized in that: It also includes a rectifier module, which includes several diodes. The cathodes of diodes D1, D3 and D5 among the several diodes are connected to the OUT1 terminal; the anode of diode D1 and the cathode of diode D2 are connected to the power supply phase A; the anode of diode D3 and the cathode of diode D4 are connected to the power supply phase B; the anode of diode D5 and the cathode of diode D6 are connected to the power supply phase C; the anodes of diodes D2, D4 and D6 are grounded.

5. The three-phase non-neutral-line high-power AC-DC topology structure according to claim 4 is characterized in that: The rectifier module further 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.

6. The three-phase non-neutral-line high-power AC-DC topology structure according to claim 1 is characterized in that: It also includes a regulating module, a boost module, and a buck module. The regulating 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.

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