Three-phase alternating current phase sequence detection circuit

Abstract

The utility model discloses a three-phase alternating current phase sequence detection circuit, which comprises a phase processing module, a logic judgment module and an output driving module, and is characterized in that three input ends of the phase processing module respectively receive three-phase signal input of three-phase alternating current; the output end of the phase processing module is electrically connected with the input end of the logic judgment module, the output end of the logic judgment module is electrically connected with the input end of the output driving module, and the output end of the output driving module is used for outputting a phase sequence adjusting signal and a lacking protection signal. After an input three-phase signal is preprocessed, a phase sequence detection signal is generated, and after the signal is compared with a given output phase sequence enable signal in a logic judgment module, a driving signal is generated in an output driving module so as to control phase sequence adjustment. The three-phase alternating-current phase sequence detection circuit provided by the utility model has the effects of detecting the phase sequence and detecting whether the phase is lacked or not.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic and electrical technology field especially relates to a three -phase alternating current phase sequence detection circuit. BACKGROUND

[0002] In three -phase power system, phase sequence refers to the order of three phase voltages in the system, in the ideal case, the positive sequence of three -phase electricity is ABC phase sequence, that is, A phase voltage precedes B phase voltage 120 DEG, B phase voltage precedes C phase voltage 120 DEG, the negative sequence of three -phase electricity is ACB, that is, A phase voltage precedes C phase voltage 120 DEG, C phase voltage precedes B phase voltage 120 DEG, the principle of phase sequence detection is based on the above-mentioned determination mode to monitor and compare the phase relationship of three -phase voltage.

[0003] In order to meet the function of phase sequence detection and missing item detection, present a kind of detection circuit, to send the missing phase alarm signal and carry out automatic adjustment to wrong phase sequence. UTILITY MODEL CONTENT

[0004] For the above problems, the present application provides a three -phase alternating current phase sequence detection circuit, to solve the problems in the prior art.

[0005] The specific technical scheme is as follows:

[0006] A three -phase alternating current phase sequence detection circuit, including phase processing module, logic judgment module and output drive module, the three input ends of the phase processing module receive three -phase alternating current three -phase signal input respectively, the output end of the phase processing module is electrically connected with the input end of the logic judgment module, the output end of the logic judgment module is electrically connected with the input end of the output drive module, and the output end of the output drive module is used for outputting phase sequence adjustment signal and missing item protection signal respectively.

[0007] The three-phase alternating current phase sequence detection circuit has the following characteristics: the phase processing module comprises resistors RUA1, RUA2, RUA3, RUA4, resistors RUB1, RUB2, RUB3, RUB4, resistors RUC1, RUC2, RUC3, RUC4, a resistor RUN1, a transformer TXUA1, a transformer TXUB1, a transformer TXUC1, a capacitor CUA1, a capacitor CUB1, a capacitor CUC1, a capacitor CUN1, and a phase detection chip U3, the resistor RUA3 and the resistor RUA4 are connected in series, one end of the series connection of the resistor RUA3 and the resistor RUA4 is connected to a first phase input terminal, the other end of the series connection of the resistor RUA3 and the resistor RUA4 is electrically connected to one end of a primary coil of the transformer TXUA1, the other end of the primary coil of the transformer TXUA1 is connected to a zero line, one end of a secondary coil of the transformer TXUA1 is connected to the ground through the resistor RUA1 and the capacitor CUA1 in sequence, and the common end of the resistor RUA1 and the capacitor CUA1 is electrically connected to a first input terminal of the phase detection chip U3 as an output terminal VAP;

[0008] the resistor RUB3 and the resistor RUB4 are connected in series, one end of the series connection of the resistor RUB3 and the resistor RUB4 is connected to a second phase input terminal, the other end of the series connection of the resistor RUB3 and the resistor RUB4 is electrically connected to one end of a primary coil of the transformer TXUB1, the other end of the primary coil of the transformer TXUB1 is connected to a zero line, one end of a secondary coil of the transformer TXUB1 is connected to the ground through the resistor RUB1 and the capacitor CUB1 in sequence, and the common end of the resistor RUB1 and the capacitor CUB1 is electrically connected to a second input terminal of the phase detection chip U3 as an output terminal VBP;

[0009] the resistor RUC3 and the resistor RUC4 are connected in series, one end of the series connection of the resistor RUC3 and the resistor RUC4 is connected to a third phase input terminal, the other end of the series connection of the resistor RUC3 and the resistor RUC4 is electrically connected to one end of a primary coil of the transformer TXUC1, the other end of the primary coil of the transformer TXUC1 is connected to a zero line, one end of a secondary coil of the transformer TXUC1 is connected to the ground through the resistor RUC1 and the capacitor CUC1 in sequence, and the common end of the resistor RUC1 and the capacitor CUC1 is electrically connected to a third input terminal of the phase detection chip U3 as an output terminal VCP;

[0010] The other end of the secondary coil of the transformer TXUA1, the other end of the secondary coil of the transformer TXUB1 and the other end of the secondary coil of the transformer TXUC1 are electrically connected with each other, the other end of the secondary coil of the transformer TXUC1 is grounded in sequence through the resistor RUN1 and the capacitor CUN1, and the common end of the resistor RUN1 and the capacitor CUN1 is electrically connected with the fourth input end of the phase detection chip U3 as an output end VN.

[0011] The plurality of output ends of the phase detection chip U3 are electrically connected with the plurality of input ends of the logic judgment module.

[0012] The three-phase alternating current phase sequence detection circuit has the characteristics that the phase detection chip U3 is a three-phase electric energy metering chip with a model number of ADE7758 and a peripheral circuit matched with the three-phase electric energy metering chip.

[0013] The three-phase alternating current phase sequence detection circuit has the characteristics that the logic judgment module comprises a single-chip microcomputer with a model number of STC12C5412 and a peripheral circuit matched with the single-chip microcomputer.

[0014] The three-phase alternating current phase sequence detection circuit has the characteristics that the output driving module comprises an integrated chip with a model number of ULN2003.

[0015] The three-phase alternating current phase sequence detection circuit further comprises an enable control circuit, the enable control circuit comprises a resistor R1, a resistor R6 and a capacitor C16, one end of the resistor R1 is an enable end, the other end of the resistor R1 is grounded through the resistor R6, the capacitor C16 is connected in parallel across the resistor R6, and the common end of the resistor R1 and the resistor R6 is an output end and is electrically connected with an enable input end of the logic judgment module.

[0016] In summary, the scheme has the beneficial effects that:

[0017] In the three-phase alternating current phase sequence detection circuit, after the input three-phase signals are preprocessed, phase sequence detection signals are generated, the signals are compared with given output phase sequence enable signals in the logic judgment module, and driving signals are generated in the output driving module to control phase sequence adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model provides a three -phase alternating current phase sequence detection circuit's structural block diagram;

[0019] Figure 2The utility model discloses a three -phase alternating current phase sequence detection circuit's phase processing module's circuit structure schematic drawing,

[0020] Figure 3 The utility model discloses a three -phase alternating current phase sequence detection circuit's logic judgment module's circuit structure schematic drawing,

[0021] Figure 4 The utility model discloses a three -phase alternating current phase sequence detection circuit's output drive module and enable control circuit's circuit structure schematic drawing,

[0022] Figure 5 The utility model discloses a three -phase alternating current phase sequence detection circuit's output drive module and enable control circuit's structure schematic drawing. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be described clearly and completely below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0025] The utility model will be further described below in conjunction with specific embodiments, but not as the limitation of the utility model.

[0026] Figure 1 The utility model discloses a three -phase alternating current phase sequence detection circuit's structure block diagram, Figure 2 The utility model discloses a three -phase alternating current phase sequence detection circuit's phase processing module's circuit structure schematic drawing, Figure 3 The utility model discloses a three -phase alternating current phase sequence detection circuit's logic judgment module's circuit structure schematic drawing, Figure 4 The utility model discloses a three -phase alternating current phase sequence detection circuit's output drive module and enable control circuit's circuit structure schematic drawing, Figure 5 The utility model discloses a three -phase alternating current phase sequence detection circuit's output drive module and enable control circuit's structure schematic drawing, as Figures 1-5 The three -phase alternating current phase sequence detection circuit provided by the embodiment includes a phase processing module, a logic judgment module and an output drive module, three input ends of the phase processing module receive three-phase alternating current three-phase signal input respectively, an output end of the phase processing module is electrically connected with an input end of the logic judgment module, an output end of the logic judgment module is electrically connected with an input end of the output drive module, and output ends of the output drive module are used for outputting phase sequence adjustment signal and missing item protection signal respectively.

[0027] In the above embodiment, the phase processing module includes resistors RUA1, RUA2, RUA3, RUA4, resistors RUB1, RUB2, RUB3, RUB4, resistors RUC1, RUC2, RUC3, RUC4, resistor RUN1, transformer TXUA1, transformer TXUB1, transformer TXUC1, capacitor CUA1, capacitor CUB1, capacitor CUC1, capacitor CUN1, and phase detection chip U3, resistors RUA3 and RUA4 are connected in series, one end of the whole series connection is used as a first phase input end, the other end of the whole series connection is electrically connected to one end of a primary coil of transformer TXUA1, the other end of the primary coil of transformer TXUA1 is connected to a zero line, one end of a secondary coil of transformer TXUA1 is connected to ground through resistor RUA1 and capacitor CUA1 in sequence, the common end of resistor RUA1 and capacitor CUA1 is electrically connected to a first input end of phase detection chip U3 as an output end VAP, the other end of the secondary coil of transformer TXUA1 is also electrically connected to the other end of the secondary coil through resistor RUA2;

[0028] Resistors RUB3 and RUB4 are connected in series, one end of the whole series connection is used as a second phase input end, the other end of the whole series connection is electrically connected to one end of a primary coil of transformer TXUB1, the other end of the primary coil of transformer TXUB1 is connected to a zero line, one end of a secondary coil of transformer TXUB1 is connected to ground through resistor RUB1 and capacitor CUB1 in sequence, the common end of resistor RUB1 and capacitor CUB1 is electrically connected to a second input end of phase detection chip U3 as an output end VBP, the other end of the secondary coil of transformer TXUB1 is also electrically connected to the other end of the secondary coil through resistor RUB2;

[0029] Resistors RUC3 and RUC4 are connected in series, one end of the whole series connection is used as a third phase input end, the other end of the whole series connection is electrically connected to one end of a primary coil of transformer TXUC1, the other end of the primary coil of transformer TXUC1 is connected to a zero line, one end of a secondary coil of transformer TXUC1 is connected to ground through resistor RUC1 and capacitor CUC1 in sequence, the common end of resistor RUC1 and capacitor CUC1 is electrically connected to a third input end of phase detection chip U3 as an output end VCP, the other end of the secondary coil of transformer TXUC1 is also electrically connected to the other end of the secondary coil through resistor RUC2;

[0030] The other end of the secondary coil of the transformer TXUA1, the other end of the secondary coil of the transformer TXUB1 and the other end of the secondary coil of the transformer TXUC1 are electrically connected to each other, the other end of the secondary coil of the transformer TXUC1 is sequentially grounded through a resistor RUN1 and a capacitor CUN1, and a common end of the resistor RUN1 and the capacitor CUN1 is electrically connected to the fourth input end of the phase detection chip U3 as an output end VN.

[0031] The plurality of output ends of the phase detection chip U3 are electrically connected to the plurality of input ends of the logic judgment module.

[0032] In the above embodiment, the phase detection chip U3 adopts a three-phase electric energy metering chip of model ADE7758 and a peripheral circuit matched therewith.

[0033] In the above embodiment, the logic judgment module comprises a single-chip microcomputer of model STC12C5412 and a peripheral circuit matched therewith.

[0034] In the above embodiment, the output driving module comprises an integrated chip of model ULN2003.

[0035] In the above embodiment, an enable control circuit is further included, the enable control circuit comprises a resistor R1, a resistor R6 and a capacitor C16, one end of the resistor R1 is an enable end, the other end of the resistor R1 is grounded through the resistor R6, the capacitor C16 is connected in parallel to the two ends of the resistor R6, and the common end of the resistor R1 and the resistor R6 is electrically connected to an enable input end of the logic judgment module as an output end.

[0036] It should be noted that a phase sequence adjustment mechanism is further included, when the detection module detects that the phase sequence is a positive phase sequence, the output end QA outputs a positive signal to the phase sequence adjustment mechanism, the phase sequence adjustment mechanism is not started, and the three-phase alternating current is normally output, when the detection module detects that the phase sequence is a reverse phase sequence, the output end QA outputs a reverse signal to the phase sequence adjustment mechanism, the phase sequence adjustment mechanism is started, so that the three-phase signal is output after the phase sequence is converted, and when the detection module detects that there is a missing phase, the output end QB outputs a missing phase signal, and the power supply is cut off through an external execution mechanism, so that the missing phase protection is achieved.

[0037] Working principle, the three-phase phase signals are input from IN1, IN2 and IN3, and are processed by the "phase sequence processing" module to generate a phase sequence detection signal, the signal is compared with a given output phase sequence selection signal SEL in the logic judgment module, and a driving signal is generated in the output driving module to control the phase sequence adjustment mechanism, when the three-phase phase signals are simultaneously processed by the "missing phase detection" module, the power supply is judged whether there is a missing phase, and the module is externally enabled to control, the enable end is high level effective, and whether an alarm signal is output in the missing phase state can be selected to control the execution mechanism to cut off the power supply, so that the purpose of missing phase protection is achieved.

[0038] The above merely describes preferred embodiments of the present application, and is not intended to limit the implementation and protection scope of the present application. For those skilled in the art, it should be understood that any equivalent substitutions and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A three-phase AC phase sequence detection circuit, characterized in that, It includes a phase processing module, a logic judgment module, and an output driving module. The three input terminals of the phase processing module receive three-phase signals from a three-phase AC power source. The output terminal of the phase processing module is electrically connected to the input terminal of the logic judgment module, and the output terminal of the logic judgment module is electrically connected to the input terminal of the output driving module. The output terminal of the output driving module is used to output a phase sequence adjustment signal and a phase loss protection signal, respectively.

2. The three-phase AC phase sequence detection circuit according to claim 1, characterized in that: The phase processing module includes resistors RUA1, RUA2, RUA3, RUA4, RUB1, RUB2, RUB3, RUB4, RUC1, RUC2, RUC3, RUC4, RUN1, transformers TXUA1, TXUB1, TXUC1, capacitors CUA1, CUB1, CUC1, CUN1, and a phase detection chip U3. Resistors RUA3 and RUA4 are connected in series, with one end of the series connection... As the first phase input terminal, the other end of the whole is electrically connected to one end of the primary coil of the transformer TXUA1. The other end of the primary coil of the transformer TXUA1 is connected to the neutral wire. One end of the secondary coil of the transformer TXUA1 is grounded after passing through the resistor RUA1 and the capacitor CUA1 in sequence. The common terminal of the resistor RUA1 and the capacitor CUA1 is used as the output terminal VAP and electrically connected to the first input terminal of the phase detection chip U3. One end of the secondary coil of the transformer TXUA1 is also electrically connected to the other end of its secondary coil through the resistor RUA2. The resistors RUB3 and RUB4 are connected in series. One end of the series connection serves as the second phase input terminal, and the other end is electrically connected to one end of the primary coil of the transformer TXUB1. The other end of the primary coil of the transformer TXUB1 is connected to the neutral wire. One end of the secondary coil of the transformer TXUB1 is grounded after passing through the resistor RUB1 and the capacitor CUB1 in sequence. The common terminal of the resistor RUB1 and the capacitor CUB1 serves as the output terminal VBP and is electrically connected to the second input terminal of the phase detection chip U3. One end of the secondary coil of the transformer TXUB1 is also electrically connected to the other end of its secondary coil through the resistor RUB2. The resistors RUC3 and RUC4 are connected in series. One end of the series connection serves as the third phase input terminal, and the other end is electrically connected to one end of the primary coil of the transformer TXUC1. The other end of the primary coil of the transformer TXUC1 is connected to the neutral wire. One end of the secondary coil of the transformer TXUC1 is grounded after passing through the resistor RUC1 and the capacitor CUC1 in sequence. The common terminal of the resistor RUC1 and the capacitor CUC1 serves as the output terminal VCP and is electrically connected to the third input terminal of the phase detection chip U3. One end of the secondary coil of the transformer TXUC1 is also electrically connected to the other end of its secondary coil through the resistor RUC2. The other ends of the secondary coils of transformer TXUA1, transformer TXUB1, and transformer TXUC1 are electrically connected to each other. The other ends of the secondary coils of transformer TXUC1 are grounded sequentially through resistor RUN1 and capacitor CUN1. The common terminal of resistor RUN1 and capacitor CUN1 is used as the output terminal VN and electrically connected to the fourth input terminal of phase detection chip U3. The multiple output terminals of the phase detection chip U3 are electrically connected to the multiple input terminals of the logic judgment module.

3. A three-phase AC phase sequence detection circuit according to claim 2, characterized in that: The phase detection chip U3 uses a three-phase power metering chip of model ADE7758 and its compatible peripheral circuit.

4. The three-phase AC phase sequence detection circuit according to claim 1, characterized in that: The logic judgment module includes a microcontroller of model STC12C5412 and its compatible peripheral circuits.

5. A three-phase AC phase sequence detection circuit according to claim 1, characterized in that: The output driver module includes an integrated chip of model ULN2003.

6. A three-phase AC phase sequence detection circuit according to any one of claims 1-5, characterized in that: It also includes an enable control circuit, which includes resistors R1 and R6 and capacitor C16. One end of resistor R1 serves as the enable terminal, and the other end of resistor R1 is grounded through resistor R6. Capacitor C16 is connected in parallel across resistor R6. The common terminal of resistors R1 and R6 serves as the output terminal and is electrically connected to the enable input terminal of the logic judgment module.

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