Three-phase alternating current zero-crossing and grounding signal output device

Abstract

The utility model discloses a three-phase alternating current zero-crossing and grounding signal output device, which belongs to the technical field of three-phase alternating current zero-crossing and grounding signal output and comprises a three-phase alternating current to 5V and 3.3 V voltage stabilizing circuit, a three-phase waveform arrangement pulse circuit, a grounding detection circuit, a relay change-over switch, an input / output interface and the like. The accuracy of three-phase power zero-crossing detection and grounding is ensured, and the phenomenon of multiple zero-crossing points caused by power grid voltage fluctuation and noise can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of three-phase alternating current zero-crossing and grounding signal output, in particular to a three-phase alternating current zero-crossing and grounding signal output device. Background Art

[0002] As people's living standards continue to improve, research on the stability and reliability of daily electrical appliances is also gradually increasing. From external power grids to power grid signal processing to more stable power grid equipment, more hardware circuits can work more safely, which is the focus of research. Three-phase power supply is a power supply mode that is gradually emerging. It is regarded as an advanced representative by consumers in high-power electrical appliances. Under normal circumstances, there are unknowns in the zero-crossing point and grounding of three-phase alternating current obtained from the power grid. The zero-crossing detection of three-phase power supply plays a very important role in three-phase synchronous control and three-phase thyristor phase shift triggering. At present, the international research on the zero-crossing detection system of intelligent power supply is deepening, and in the research of intelligent switches, the precise control of the zero voltage of the switch has also become a focus.

[0003] Therefore, how to ensure the accuracy of three-phase electricity zero-crossing detection and grounding has become the focus of research. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a three-phase alternating current zero-crossing and grounding signal output device in view of the deficiencies of the background technology.

[0005] The utility model adopts the following technical solutions to solve the above technical problems:

[0006] A three-phase AC zero-crossing and grounding signal output device, comprising a three-phase AC to 5V and 3.3V voltage stabilizing circuit, a three-phase waveform sorting pulse circuit and a grounding detection circuit, a relay switch and an input and output interface;

[0007] The three-phase AC power to 5V and 3.3V voltage stabilizing circuit comprises a three-phase AC power U terminal, a three-phase AC power V terminal, a three-phase AC power W terminal, a fuse F1, a fuse F2, a fuse F3, a varistor RT1, a varistor RT2, a varistor RT3, a power module HB1, a polar capacitor E2, a capacitor C1, a voltage stabilizing diode DZ1, a chip V1, a polar capacitor E1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a +5V voltage terminal and a +3.3V voltage terminal;

[0008] The three-phase AC U end is connected to one end of the varistor RT1, one end of the varistor RT2 and pin 1 of the power module HB1 through the fuse F1. The three-phase AC V end is connected to the other end of the varistor RT1, one end of the varistor RT3 and pin 2 of the power module HB1 through the fuse F2. The three-phase AC W end is connected to the other end of the varistor RT3, the other end of the varistor RT2 and pin 3 of the power module HB1 through the fuse F3. Pin 5 of the power module HB1 is connected to one end of the polarity capacitor E2, one end of the capacitor C1 and the other end of the capacitor E2. End, one end of the voltage regulator diode DZ1, the +5V voltage end and pin 3 of the chip V1, pin 5 of the power module HB1 is respectively connected to the other end of the polarity capacitor E2, the other end of the capacitor C1, the other end of the voltage regulator diode DZ1, pin 1 of the chip V1, one end of the polarity capacitor E1, one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and grounded, and pin 2 of the chip V1 is respectively connected to the other end of the polarity capacitor E1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, and the other end of the capacitor C5.

[0009] As a further preferred embodiment of the three-phase AC zero-crossing and grounding signal output device of the utility model, the three-phase waveform arrangement pulse circuit comprises a three-phase AC VV terminal, a three-phase AC VU terminal, a resistor R3, a resistor R7, a capacitor CX1, a rectifier bridge DB1, a voltage regulator diode DZ2, a resistor R5, a polarity capacitor EC1, a diode D1, a transistor Q1, a chip U1, a resistor R1, a resistor R2, a resistor R4, a resistor R6, a capacitor C6, a capacitor C7, a transistor Q2, a 3.3V voltage terminal, and an INT1 terminal;

[0010] The three-phase AC power VV end is connected to one end of the resistor R3, the three-phase AC power VU end is connected to one end of the resistor R7, the other end of the resistor R3 is respectively connected to one end of the capacitor CX1 and the interface 1 of the rectifier bridge DB1, the other end of the resistor R7 is connected to the interface 3 of the rectifier bridge DB1, the interface 2 of the rectifier bridge DB1 is respectively connected to the positive electrode of the Zener diode DZ2, one end of the resistor R5, one end of the polarity capacitor EC1, and the interface 2 of the chip U1, the interface 4 of the rectifier bridge DB1 is respectively connected to the negative electrode of the Zener diode DZ2, the other end of the resistor R5, the positive electrode of the diode D1, and the base of the transistor Q1, and the negative electrode of the diode D1 is respectively connected to the base of the polarity capacitor EC1 The other end, the emitter of transistor Q1, and the collector of transistor Q1 are connected to interface 1 of chip U1, interface 4 of chip U1 is respectively connected to one end of resistor R1 and +3.3V voltage end, the other end of resistor R1 is respectively connected to the collector of transistor Q3 and one end of resistor R2, the other end of resistor R2 is respectively connected to INT1 end and one end of capacitor C6, interface 3 of chip U1 is respectively connected to one end of resistor R6, one end of resistor R4 and one end of capacitor C7, the other end of resistor R6 is respectively connected to the other end of capacitor C7, the emitter of transistor Q2, the other end of capacitor C6 and grounded, and the other end of resistor R4 is connected to the base of transistor Q2.

[0011] As a further preferred embodiment of the three-phase AC zero-crossing and grounding signal output device of the utility model, the three-phase waveform arrangement pulse circuit further comprises a three-phase AC VW terminal, a three-phase AC VV terminal, a resistor R10, a resistor R14, a capacitor CX2, a rectifier bridge DB2, a voltage regulator diode DZ3, a resistor R12, a polar capacitor EC2, a diode D2, a transistor Q3, a chip U2, a resistor R8, a resistor R9, a resistor R11, a resistor R13, a capacitor C8, a capacitor C9, a transistor Q4, a 3.3V voltage terminal, and an INT2 terminal;

[0012] The three-phase AC power VW end is connected to one end of the resistor R10, the three-phase AC power VV end is connected to one end of the resistor R14, the other end of the resistor R10 is respectively connected to one end of the capacitor CX2 and the interface 1 of the rectifier bridge DB2, the other end of the resistor R14 is connected to the interface 3 of the rectifier bridge DB2, the interface 2 of the rectifier bridge DB2 is respectively connected to the positive electrode of the Zener diode DZ3, one end of the resistor R12, one end of the polarity capacitor EC2, and the interface 2 of the chip U2, the interface 4 of the rectifier bridge DB2 is respectively connected to the negative electrode of the Zener diode DZ3, the other end of the resistor R12, the positive electrode of the diode D2, and the base of the transistor Q3, and the negative electrode of the diode D2 is respectively connected to the polarity capacitor EC2 The other end of the transistor Q3 and the emitter of the transistor Q3, the collector of the transistor Q3 is connected to the interface 1 of the chip U2, the interface 4 of the chip U2 is respectively connected to one end of the resistor R8 and the +3.3V voltage end, the other end of the resistor R8 is respectively connected to the collector of the transistor Q4 and one end of the resistor R9, the other end of the resistor R9 is respectively connected to the INT2 end and one end of the capacitor C8, the interface 3 of the chip U2 is respectively connected to one end of the resistor R13, one end of the resistor R11 and one end of the capacitor C8, the other end of the resistor R13 is respectively connected to the other end of the capacitor C9, the emitter of the transistor Q4, the other end of the capacitor C8 and grounded, and the other end of the resistor R11 is connected to the base of the transistor Q4.

[0013] As a further preferred embodiment of the three-phase AC zero-crossing and grounding signal output device of the utility model, the three-phase waveform arrangement pulse circuit further includes a three-phase AC VU terminal, a three-phase AC VW terminal, a resistor R17, a resistor R21, a capacitor CX3, a rectifier bridge DB3, a voltage regulator diode DZ4, a resistor R19, a polarity capacitor EC3, a diode D3, a transistor Q5, a chip U3, a resistor R15, a resistor R16, a resistor R18, a resistor R20, a capacitor C10, a capacitor C11, a transistor Q6, a 3.3V voltage terminal, and an INT3 terminal;

[0014] The three-phase AC power VU end is connected to one end of the resistor R17, the three-phase AC power VW end is connected to one end of the resistor R21, the other end of the resistor R17 is respectively connected to one end of the capacitor CX3 and the interface 1 of the rectifier bridge DB3, the other end of the resistor R21 is connected to the interface 3 of the rectifier bridge DB3, the interface 2 of the rectifier bridge DB3 is respectively connected to the positive electrode of the voltage-stabilizing diode DZ4, one end of the resistor R19, one end of the polarity capacitor EC3, and the interface 2 of the chip U3, the interface 4 of the rectifier bridge DB3 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ4, the other end of the resistor R19, the positive electrode of the diode D3, and the base of the transistor Q5, and the negative electrode of the diode D3 is respectively connected to the other end of the polarity capacitor EC3 , the emitter of transistor Q5, the collector of transistor Q5 is connected to interface 1 of chip U3, interface 4 of chip U3 is respectively connected to one end of resistor R15 and +3.3V voltage terminal, the other end of resistor R15 is respectively connected to the collector of transistor Q6 and one end of resistor R16, the other end of resistor R16 is respectively connected to INT3 terminal and one end of capacitor C10, interface 3 of chip U3 is respectively connected to one end of resistor R20, one end of resistor R18 and one end of capacitor C10, the other end of resistor R20 is respectively connected to the other end of capacitor C11, the emitter of transistor Q6, the other end of capacitor C10 and grounded, the other end of resistor R18 is connected to the base of transistor Q6.

[0015] As a further preferred embodiment of the three-phase AC zero-crossing and grounding signal output device of the utility model, the grounding detection circuit, relay switching switch and input and output interface include a +5V voltage terminal, a diode D4, a resistor R29, a relay JK1, a fuse F4, a varistor RT4, a resistor R25, a resistor R28, a capacitor CX4, a rectifier bridge DB4, a voltage-stabilizing diode DZ5, a capacitor E3, a resistor R24, a chip U4, a resistor R22, a resistor R23, a resistor R26, a resistor R27, a capacitor C13, a transistor Q7, a capacitor C12, a +3.3V The +5V voltage terminal is connected to the cathode of the diode D4 and the pin 1 of the relay JK1 respectively, the anode of the diode D4 is connected to the collector of the transistor Q8 and the pin 8 of the relay JK1, the base of the transistor Q8 is connected to one end of the resistor R29, the other end of the resistor R29 is connected to the DLAY terminal, the emitter of the transistor Q8 is grounded, the three-phase AC power VU terminal is connected to the pin 3 and the pin 6 of the relay JK1 respectively, the pin 2 and the pin 7 of the relay JK1 are connected to one end of the varistor RT4 and one end of the resistor R25 respectively, and the other end of the varistor RT4 is connected to the resistor R The other end of the resistor R25 is connected to one end of the capacitor CX4 and the interface 1 of the rectifier bridge DB4 respectively. The other end of the resistor R28 is connected to the other end of the capacitor CX4 and the interface 3 of the rectifier bridge DB4 respectively. The interface 2 of the rectifier bridge DB4 is connected to one end of the voltage-stabilizing diode DZ5, one end of the capacitor E3 and the pin 2 of the chip U4 respectively. The interface 4 of the rectifier bridge DB4 is connected to the other end of the voltage-stabilizing diode DZ5, the other end of the capacitor E3 and the pin 2 of the chip U4 respectively. One end of resistor R24, the other end of resistor R24 ​​is connected to interface 1 of chip U4, interface 4 of chip U4 is respectively connected to the +3.3V voltage end and one end of resistor R22, the other end of resistor R22 is respectively connected to one end of resistor R23 and the collector of transistor Q7, the base of transistor Q7 is connected to one end of resistor R26, the other end of resistor R26 is respectively connected to one end of capacitor C13, one end of resistor R27 and interface 3 of chip U4, the other end of resistor R27 is respectively connected to the other end of capacitor C13, the emitter of transistor Q7, the other end of capacitor C12 and grounded.

[0016] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0017] The utility model discloses a three-phase AC zero-crossing and grounding signal output device, which is composed of a three-phase AC power conversion 5V and 3.3V voltage stabilizing circuit, a three-phase waveform sorting pulse circuit, a grounding detection circuit, a relay switching switch and an input and output interface, etc., to ensure the accuracy of three-phase power zero-crossing detection and grounding, and can effectively reduce the phenomenon of multiple zero-crossing points caused by power grid voltage fluctuations and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will describe the embodiments or the prior art.

[0019] The drawings required for the technical description are briefly introduced. Obviously, the drawings in the following description are the drawings of the present invention.

[0020] Some embodiments of the present invention can be easily implemented by ordinary technicians in this field without creative work.

[0021] From these drawings, other drawings are derived.

[0022] Figure 1 It is a circuit diagram of a three-phase AC zero-crossing and grounding signal output device of the utility model;

[0023] Figure 2 It is a three-phase AC voltage waveform diagram of the utility model. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Three-phase AC zero-crossing and grounding signal output device, such as Figure 1 As shown, it includes a three-phase AC power conversion 5V and 3.3V voltage stabilizing circuit, a three-phase waveform sorting pulse circuit and a ground detection circuit, a relay switch and an input and output interface;

[0027] The three-phase AC power to 5V and 3.3V voltage stabilizing circuit comprises a three-phase AC power U terminal, a three-phase AC power V terminal, a three-phase AC power W terminal, a fuse F1, a fuse F2, a fuse F3, a varistor RT1, a varistor RT2, a varistor RT3, a power module HB1, a polar capacitor E2, a capacitor C1, a voltage stabilizing diode DZ1, a chip V1, a polar capacitor E1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a +5V voltage terminal and a +3.3V voltage terminal;

[0028] The three-phase AC U end is connected to one end of the varistor RT1, one end of the varistor RT2 and pin 1 of the power module HB1 through the fuse F1. The three-phase AC V end is connected to the other end of the varistor RT1, one end of the varistor RT3 and pin 2 of the power module HB1 through the fuse F2. The three-phase AC W end is connected to the other end of the varistor RT3, the other end of the varistor RT2 and pin 3 of the power module HB1 through the fuse F3. Pin 5 of the power module HB1 is connected to one end of the polarity capacitor E2, one end of the capacitor C1 and the other end of the capacitor E2. End, one end of the voltage regulator diode DZ1, the +5V voltage end and pin 3 of the chip V1, pin 5 of the power module HB1 is respectively connected to the other end of the polarity capacitor E2, the other end of the capacitor C1, the other end of the voltage regulator diode DZ1, pin 1 of the chip V1, one end of the polarity capacitor E1, one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and grounded, and pin 2 of the chip V1 is respectively connected to the other end of the polarity capacitor E1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, and the other end of the capacitor C5.

[0029] The three-phase waveform tidying pulse circuit comprises a three-phase alternating current VV terminal, a three-phase alternating current VU terminal, a resistor R3, a resistor R7, a capacitor CX1, a rectifier bridge DB1, a voltage stabilizing diode DZ2, a resistor R5, a polarity capacitor EC1, a diode D1, a transistor Q1, a chip U1, a resistor R1, a resistor R2, a resistor R4, a resistor R6, a capacitor C6, a capacitor C7, a transistor Q2, a 3.3V voltage terminal, and an INT1 terminal;

[0030] The three-phase AC power VV end is connected to one end of the resistor R3, the three-phase AC power VU end is connected to one end of the resistor R7, the other end of the resistor R3 is respectively connected to one end of the capacitor CX1 and the interface 1 of the rectifier bridge DB1, the other end of the resistor R7 is connected to the interface 3 of the rectifier bridge DB1, the interface 2 of the rectifier bridge DB1 is respectively connected to the positive electrode of the Zener diode DZ2, one end of the resistor R5, one end of the polarity capacitor EC1, and the interface 2 of the chip U1, the interface 4 of the rectifier bridge DB1 is respectively connected to the negative electrode of the Zener diode DZ2, the other end of the resistor R5, the positive electrode of the diode D1, and the base of the transistor Q1, and the negative electrode of the diode D1 is respectively connected to the base of the polarity capacitor EC1 The other end, the emitter of transistor Q1, and the collector of transistor Q1 are connected to interface 1 of chip U1, interface 4 of chip U1 is respectively connected to one end of resistor R1 and +3.3V voltage end, the other end of resistor R1 is respectively connected to the collector of transistor Q3 and one end of resistor R2, the other end of resistor R2 is respectively connected to INT1 end and one end of capacitor C6, interface 3 of chip U1 is respectively connected to one end of resistor R6, one end of resistor R4 and one end of capacitor C7, the other end of resistor R6 is respectively connected to the other end of capacitor C7, the emitter of transistor Q2, the other end of capacitor C6 and grounded, and the other end of resistor R4 is connected to the base of transistor Q2.

[0031] The three-phase waveform tidying pulse circuit also includes a three-phase alternating current VW terminal, a three-phase alternating current VV terminal, a resistor R10, a resistor R14, a capacitor CX2, a rectifier bridge DB2, a voltage stabilizing diode DZ3, a resistor R12, a polar capacitor EC2, a diode D2, a transistor Q3, a chip U2, a resistor R8, a resistor R9, a resistor R11, a resistor R13, a capacitor C8, a capacitor C9, a transistor Q4, a 3.3V voltage terminal, and an INT2 terminal;

[0032] The three-phase AC power VW end is connected to one end of the resistor R10, the three-phase AC power VV end is connected to one end of the resistor R14, the other end of the resistor R10 is respectively connected to one end of the capacitor CX2 and the interface 1 of the rectifier bridge DB2, the other end of the resistor R14 is connected to the interface 3 of the rectifier bridge DB2, the interface 2 of the rectifier bridge DB2 is respectively connected to the positive electrode of the Zener diode DZ3, one end of the resistor R12, one end of the polarity capacitor EC2, and the interface 2 of the chip U2, the interface 4 of the rectifier bridge DB2 is respectively connected to the negative electrode of the Zener diode DZ3, the other end of the resistor R12, the positive electrode of the diode D2, and the base of the transistor Q3, and the negative electrode of the diode D2 is respectively connected to the polarity capacitor EC2 The other end of the transistor Q3 and the emitter of the transistor Q3, the collector of the transistor Q3 is connected to the interface 1 of the chip U2, the interface 4 of the chip U2 is respectively connected to one end of the resistor R8 and the +3.3V voltage end, the other end of the resistor R8 is respectively connected to the collector of the transistor Q4 and one end of the resistor R9, the other end of the resistor R9 is respectively connected to the INT2 end and one end of the capacitor C8, the interface 3 of the chip U2 is respectively connected to one end of the resistor R13, one end of the resistor R11 and one end of the capacitor C8, the other end of the resistor R13 is respectively connected to the other end of the capacitor C9, the emitter of the transistor Q4, the other end of the capacitor C8 and grounded, and the other end of the resistor R11 is connected to the base of the transistor Q4.

[0033] The three-phase waveform tidying pulse circuit also includes a three-phase AC VU terminal, a three-phase AC VW terminal, a resistor R17, a resistor R21, a capacitor CX3, a rectifier bridge DB3, a voltage regulator diode DZ4, a resistor R19, a polarity capacitor EC3, a diode D3, a transistor Q5, a chip U3, a resistor R15, a resistor R16, a resistor R18, a resistor R20, a capacitor C10, a capacitor C11, a transistor Q6, a 3.3V voltage terminal, and an INT3 terminal;

[0034] The three-phase AC power VU end is connected to one end of the resistor R17, the three-phase AC power VW end is connected to one end of the resistor R21, the other end of the resistor R17 is respectively connected to one end of the capacitor CX3 and the interface 1 of the rectifier bridge DB3, the other end of the resistor R21 is connected to the interface 3 of the rectifier bridge DB3, the interface 2 of the rectifier bridge DB3 is respectively connected to the positive electrode of the voltage-stabilizing diode DZ4, one end of the resistor R19, one end of the polarity capacitor EC3, and the interface 2 of the chip U3, the interface 4 of the rectifier bridge DB3 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ4, the other end of the resistor R19, the positive electrode of the diode D3, and the base of the transistor Q5, and the negative electrode of the diode D3 is respectively connected to the other end of the polarity capacitor EC3 , the emitter of transistor Q5, the collector of transistor Q5 is connected to interface 1 of chip U3, interface 4 of chip U3 is respectively connected to one end of resistor R15 and +3.3V voltage terminal, the other end of resistor R15 is respectively connected to the collector of transistor Q6 and one end of resistor R16, the other end of resistor R16 is respectively connected to INT3 terminal and one end of capacitor C10, interface 3 of chip U3 is respectively connected to one end of resistor R20, one end of resistor R18 and one end of capacitor C10, the other end of resistor R20 is respectively connected to the other end of capacitor C11, the emitter of transistor Q6, the other end of capacitor C10 and grounded, the other end of resistor R18 is connected to the base of transistor Q6.

[0035] The ground detection circuit, relay switch and input / output interface include +5V voltage terminal, diode D4, resistor R29, relay JK1, fuse F4, varistor RT4, resistor R25, resistor R28, capacitor CX4, rectifier bridge DB4, voltage stabilizing diode DZ5, polarity capacitor E3, resistor R24, chip U4, resistor R22, resistor R23, resistor R26, resistor R27, capacitor C13, transistor Q7, capacitor C12, +3.3V voltage terminal; +5V voltage terminal is connected to the cathode of diode D4 ... Pin 1 of electrical appliance JK1, the positive electrode of diode D4 is connected to the collector of transistor Q8 and pin 8 of relay JK1, the base of transistor Q8 is connected to one end of resistor R29, the other end of resistor R29 is connected to DLAY end, the emitter of transistor Q8 is grounded, the three-phase AC power VU end is respectively connected to pin 3 and pin 6 of relay JK1, pin 2 and pin 7 of relay JK1 are respectively connected to one end of varistor RT4 and one end of resistor R25, the other end of varistor RT4 is respectively connected to one end of resistor R28 and one end of fuse F4, The other end of the fuse F4 is connected to one end of the capacitor CA1, the other end of the capacitor CA1 is grounded, the other end of the resistor R25 is respectively connected to one end of the capacitor CX4 and the interface 1 of the rectifier bridge DB4, the other end of the resistor R28 is respectively connected to the other end of the capacitor CX4 and the interface 3 of the rectifier bridge DB4, the interface 2 of the rectifier bridge DB4 is respectively connected to one end of the voltage zener diode DZ5, one end of the capacitor E3 and the pin 2 of the chip U4, the interface 4 of the rectifier bridge DB4 is respectively connected to the other end of the voltage zener diode DZ5, the other end of the capacitor E3 and one end of the resistor R24, The other end of resistor R24 ​​is connected to interface 1 of chip U4, interface 4 of chip U4 is respectively connected to the +3.3V voltage end and one end of resistor R22, the other end of resistor R22 is respectively connected to one end of resistor R23 and the collector of transistor Q7, the base of transistor Q7 is connected to one end of resistor R26, the other end of resistor R26 is respectively connected to one end of capacitor C13, one end of resistor R27 and interface 3 of chip U4, the other end of resistor R27 is respectively connected to the other end of capacitor C13, the emitter of transistor Q7, the other end of capacitor C12 and grounded.

[0036] When the three-phase power supply is working, it will inevitably form a corresponding three-phase alternating current voltage. Therefore, when detecting its zero-crossing signal, it is necessary to analyze its entire alternating current. Figure 2 The waveform of a three-phase AC voltage is shown. The A, B, and C phases of the three-phase AC voltage are 120° apart. The phase sequence combination can be divided into ABC, BCA, and CAB as positive sequence, and ACB, BAC, and CBA as negative sequence.

[0037] Implementation of zero-crossing signal detection:

[0038] The zero-crossing signal of the three-phase power supply plays a very critical role in the entire system. How to ensure that its zero-crossing signal can be detected is the most basic requirement for whether the system can be realized. At present, the detection of this signal mainly uses the MUC processor to detect some of them, and then uses the corresponding formula to calculate. This method has low accuracy requirements in value selection, is relatively convenient to operate, and can be effective.

[0039] Reduce the multiple zero crossing phenomenon caused by grid voltage fluctuation and noise.

[0040] Implementation of phase loss detection:

[0041] For thyristor control systems, if a phase loss occurs in the three-phase AC power supply, the operation of the entire system will be seriously hindered, and even load phenomena will occur, causing harm. Therefore, when designing the system, the impact of the power supply phase loss on the operation of the entire system must be considered. Usually, when a phase loss fault occurs in the system, the controller will prohibit the output of the trigger pulse to stop the system from working until the three-phase AC is restored.

[0042] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that those terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0043] The above embodiments are only for explaining the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the utility model shall fall within the protection scope of the utility model. The above embodiments of the utility model are described in detail, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the utility model.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it;

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-phase AC zero-crossing and grounding signal output device, characterized in that: It includes three-phase AC power conversion to 5V and 3.3V voltage stabilizing circuit, three-phase waveform sorting pulse circuit and ground detection circuit, relay switching switch and input and output interface; The three-phase alternating current to 5V and 3.3V voltage stabilizing circuit comprises a three-phase alternating current U terminal, a three-phase alternating current V terminal, a three-phase alternating current Galvanic W terminal, fuse F1, fuse F2, fuse F3, varistor RT1, varistor RT2, varistor RT3, power module HB1, polar capacitor E2, capacitor C1, Zener diode DZ1, chip V1, polar capacitor E1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, +5V voltage terminal and +3.3V voltage terminal; The three-phase AC U end is connected to one end of the varistor RT1, one end of the varistor RT2 and pin 1 of the power module HB1 through the fuse F1. The three-phase AC V end is connected to the other end of the varistor RT1, one end of the varistor RT3 and pin 2 of the power module HB1 through the fuse F2. The three-phase AC W end is connected to the other end of the varistor RT3, the other end of the varistor RT2 and pin 3 of the power module HB1 through the fuse F3. Pin 5 of the power module HB1 is connected to one end of the polarity capacitor E2, one end of the capacitor C1 and the other end of the capacitor E2. End, one end of the voltage regulator diode DZ1, the +5V voltage end and pin 3 of the chip V1, pin 5 of the power module HB1 is respectively connected to the other end of the polarity capacitor E2, the other end of the capacitor C1, the other end of the voltage regulator diode DZ1, pin 1 of the chip V1, one end of the polarity capacitor E1, one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, one end of the capacitor C5 and grounded, and pin 2 of the chip V1 is respectively connected to the other end of the polarity capacitor E1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, and the other end of the capacitor C5.

2. The three-phase AC zero-crossing and grounding signal output device according to claim 1, characterized in that: The three-phase waveform tidying pulse circuit comprises a three-phase alternating current VV terminal, a three-phase alternating current VU terminal, a resistor R3, a resistor R7, a capacitor CX1, a rectifier bridge DB1, a voltage stabilizing diode DZ2, a resistor R5, a polarity capacitor EC1, a diode D1, a transistor Q1, a chip U1, a resistor R1, a resistor R2, a resistor R4, a resistor R6, a capacitor C6, a capacitor C7, a transistor Q2, a 3.3V voltage terminal, and an INT1 terminal; The three-phase AC VV terminal is connected to one end of the resistor R3, and the three-phase AC VU terminal is connected to one end of the resistor R7. The other end of the rectifier bridge DB1 is respectively connected to one end of the capacitor CX1 and the interface 1 of the rectifier bridge DB1, the other end of the resistor R7 is connected to the interface 3 of the rectifier bridge DB1, the interface 2 of the rectifier bridge DB1 is respectively connected to the positive electrode of the Zener diode DZ2, one end of the resistor R5, one end of the polarity capacitor EC1, and the interface 2 of the chip U1, the interface 4 of the rectifier bridge DB1 is respectively connected to the negative electrode of the Zener diode DZ2, the other end of the resistor R5, the positive electrode of the diode D1, and the base of the transistor Q1, the negative electrode of the diode D1 is respectively connected to the other end of the polarity capacitor EC1, the emitter of the transistor Q1, and the transistor Q1 The collector is connected to interface 1 of chip U1, interface 4 of chip U1 is respectively connected to one end of resistor R1 and +3.3V voltage end, the other end of resistor R1 is respectively connected to the collector of transistor Q2 and one end of resistor R2, the other end of resistor R2 is respectively connected to INT1 end and one end of capacitor C6, interface 3 of chip U1 is respectively connected to one end of resistor R6, one end of resistor R4 and one end of capacitor C7, the other end of resistor R6 is respectively connected to the other end of capacitor C7, the emitter of transistor Q2, the other end of capacitor C6 and grounded, the other end of resistor R4 is connected to the base of transistor Q2.

3. The three-phase AC zero-crossing and grounding signal output device according to claim 1, characterized in that: The three-phase waveform tidying pulse circuit also includes a three-phase alternating current VW terminal, a three-phase alternating current VV terminal, a resistor R10, a resistor R14, a capacitor CX2, a rectifier bridge DB2, a voltage stabilizing diode DZ3, a resistor R12, a polar capacitor EC2, a diode D2, a transistor Q3, a chip U2, a resistor R8, a resistor R9, a resistor R11, a resistor R13, a capacitor C8, a capacitor C9, a transistor Q4, a 3.3V voltage terminal, and an INT2 terminal; The three-phase AC VW terminal is connected to one end of the resistor R10, and the three-phase AC VV terminal is connected to one end of the resistor R14. The other end of the rectifier bridge DB2 is respectively connected to one end of the capacitor CX2 and the interface 1 of the rectifier bridge DB2, the other end of the resistor R14 is connected to the interface 3 of the rectifier bridge DB2, the interface 2 of the rectifier bridge DB2 is respectively connected to the positive electrode of the voltage zener diode DZ3, one end of the resistor R12, one end of the polarity capacitor EC2, and the interface 2 of the chip U2, the interface 4 of the rectifier bridge DB2 is respectively connected to the negative electrode of the voltage zener diode DZ3, the other end of the resistor R12, the positive electrode of the diode D2, and the base of the transistor Q3, the negative electrode of the diode D2 is respectively connected to the other end of the polarity capacitor EC2, the emitter of the transistor Q3, and the collector of the transistor Q3 The electrode is connected to interface 1 of chip U2, interface 4 of chip U2 is respectively connected to one end of resistor R8 and +3.3V voltage terminal, the other end of resistor R8 is respectively connected to the collector of transistor Q4 and one end of resistor R9, the other end of resistor R9 is respectively connected to INT2 terminal and one end of capacitor C8, interface 3 of chip U2 is respectively connected to one end of resistor R13, one end of resistor R11 and one end of capacitor C8, the other end of resistor R13 is respectively connected to the other end of capacitor C9, the emitter of transistor Q4, the other end of capacitor C8 and grounded, the other end of resistor R11 is connected to the base of transistor Q4.

4. The three-phase AC zero-crossing and grounding signal output device according to claim 1, characterized in that: The three-phase waveform tidying pulse circuit also includes a three-phase alternating current VU terminal, a three-phase alternating current VW terminal, a resistor R17, a resistor R21, a capacitor CX3, a rectifier bridge DB3, a voltage stabilizing diode DZ4, a resistor R19, a polar capacitor EC3, a diode D3, a transistor Q5, a chip U3, a resistor R15, a resistor R16, a resistor R18, a resistor R20, a capacitor C10, a capacitor C11, a transistor Q6, a 3.3V voltage terminal, and an INT3 terminal; The three-phase AC VU terminal is connected to one end of the resistor R17, and the three-phase AC VW terminal is connected to one end of the resistor R21. The other end of the rectifier bridge DB3 is respectively connected to one end of the capacitor CX3 and the interface 1 of the rectifier bridge DB3, the other end of the resistor R21 is connected to the interface 3 of the rectifier bridge DB3, the interface 2 of the rectifier bridge DB3 is respectively connected to the positive electrode of the voltage-stabilizing diode DZ4, one end of the resistor R19, one end of the polarity capacitor EC3, and the interface 2 of the chip U3, the interface 4 of the rectifier bridge DB3 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ4, the other end of the resistor R19, the positive electrode of the diode D3, and the base of the transistor Q5, the negative electrode of the diode D3 is respectively connected to the other end of the polarity capacitor EC3 and the emitter of the transistor Q5, and the collector of the transistor Q5 is connected Interface 1 of chip U3 and interface 4 of chip U3 are respectively connected to one end of resistor R15 and the +3.3V voltage end, the other end of resistor R15 is respectively connected to the collector of transistor Q6 and one end of resistor R16, the other end of resistor R16 is respectively connected to INT3 end and one end of capacitor C10, interface 3 of chip U3 is respectively connected to one end of resistor R20, one end of resistor R18 and one end of capacitor C10, the other end of resistor R20 is respectively connected to the other end of capacitor C11, the emitter of transistor Q6, the other end of capacitor C10 and grounded, and the other end of resistor R18 is connected to the base of transistor Q6.

5. The three-phase AC zero-crossing and grounding signal output device according to claim 1, characterized in that: The ground detection circuit, relay switch and input / output interface include +5V voltage terminal, diode D4, resistor R29, relay JK1, fuse F4, varistor RT4, resistor R25, resistor R28, capacitor CX4, rectifier bridge DB4, voltage stabilizing diode DZ5, polarity capacitor E3, resistor R24, chip U4, resistor R22, resistor R23, resistor R26, resistor R27, capacitor C13, transistor Q7, capacitor C12, +3.3V voltage terminal; +5V voltage terminal is connected to the cathode of diode D4 ... Pin 1 of electrical appliance JK1, the positive electrode of diode D4 is connected to the collector of transistor Q8 and pin 8 of relay JK1, the base of transistor Q8 is connected to one end of resistor R29, the other end of resistor R29 is connected to DLAY end, the emitter of transistor Q8 is grounded, the three-phase AC power VU end is respectively connected to pin 3 and pin 6 of relay JK1, pin 2 and pin 7 of relay JK1 are respectively connected to one end of varistor RT4 and one end of resistor R25, the other end of varistor RT4 is respectively connected to one end of resistor R28 and one end of fuse F4, The other end of the fuse F4 is connected to one end of the capacitor CA1, the other end of the capacitor CA1 is grounded, the other end of the resistor R25 is respectively connected to one end of the capacitor CX4 and the interface 1 of the rectifier bridge DB4, the other end of the resistor R28 is respectively connected to the other end of the capacitor CX4 and the interface 3 of the rectifier bridge DB4, the interface 2 of the rectifier bridge DB4 is respectively connected to one end of the voltage zener diode DZ5, one end of the capacitor E3 and the pin 2 of the chip U4, the interface 4 of the rectifier bridge DB4 is respectively connected to the other end of the voltage zener diode DZ5, the other end of the capacitor E3 and one end of the resistor R24, The other end of resistor R24 ​​is connected to interface 1 of chip U4, interface 4 of chip U4 is respectively connected to the +3.3V voltage end and one end of resistor R22, the other end of resistor R22 is respectively connected to one end of resistor R23 and the collector of transistor Q7, the base of transistor Q7 is connected to one end of resistor R26, the other end of resistor R26 is respectively connected to one end of capacitor C13, one end of resistor R27 and interface 3 of chip U4, the other end of resistor R27 is respectively connected to the other end of capacitor C13, the emitter of transistor Q7, the other end of capacitor C12 and grounded.

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