CN217879480U - Three-phase alternating current input phase-failure alarm hardware circuit - Google Patents
Three-phase alternating current input phase-failure alarm hardware circuit Download PDFInfo
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- CN217879480U CN217879480U CN202221315885.0U CN202221315885U CN217879480U CN 217879480 U CN217879480 U CN 217879480U CN 202221315885 U CN202221315885 U CN 202221315885U CN 217879480 U CN217879480 U CN 217879480U
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Abstract
The utility model belongs to the technical field of circuit control, concretely relates to three-phase alternating current input lacks looks alarm hardware circuit, including the step-down rectifier unit, sampling judge unit and isolation output unit, sampling judge unit includes steady voltage module and resistance R11, isolation output unit includes opto-coupler PC1, first step-down current-limiting module's output, second step-down current-limiting module's output, third step-down current-limiting module's output all is connected with the input of three-phase rectifier bridge, the anodal output of three-phase rectifier bridge is connected with steady voltage module, steady voltage module's output is anodal with opto-coupler PC 1's transmitting terminal to be connected, opto-coupler PC 1's transmitting terminal negative pole is connected with resistance R11's one end, resistance R11's the other end and three-phase rectifier bridge's negative pole output. The utility model discloses novel structure, design benefit directly do the monitoring to three-phase electricity input interface RST state, and the detection circuitry does not receive generating line energy storage electric capacity to influence, and the response is rapid to can distinguish the alarm type for lacking the looks or the trouble that opens circuit.
Description
Technical Field
The utility model belongs to the technical field of circuit control, concretely relates to three-phase alternating current input lacks looks alarm hardware circuit.
Background
In the design of an alternating current servo driver, the power supply of a system control unit is usually provided by 24V direct current, the power input of a power rectification inverter unit is usually provided by 220Vac or 380Vac alternating current, and the system control unit and the power unit are directly and safely electrically isolated. In industrial field application, when power input of a power unit is in power failure or phase failure, the rectified direct-current bus voltage is under-voltage or voltage fluctuation is increased, the control performance of a servo driver is affected if the direct-current bus voltage is low, and the servo driver is directly damaged if the direct-current bus voltage is high. Aiming at the fault, the control unit needs to receive a power line input fault alarm in time, controls the power unit to perform actions of interrupting output and safely stopping, and sends out the fault alarm to the upper computer to ensure that the whole control system can make a corresponding response.
For the phenomenon, in the prior art, the input fault of the power line is judged by detecting the voltage of the direct current bus rectified by the rectifier bridge and when the acquired voltage of the direct current bus is lower than a set threshold, but in this way, when the input end of the power line is three-phase alternating current input and only one phase has a phase failure, the fluctuation of the detected direct current bus voltage is increased, a control system is difficult to distinguish whether the voltage fluctuation is caused by the phase failure or the power grid fluctuation, so that misjudgment is easy to cause.
SUMMERY OF THE UTILITY MODEL
The utility model discloses problem to prior art provides a three-phase alternating current input lacks looks alarm hardware circuit, directly does the monitoring to three-phase electricity input interface RST state, and the detection circuitry does not receive generating line energy storage electric capacity to influence, and the response is rapid to can distinguish the alarm type for lacking looks or the trouble of opening a circuit.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a three-phase alternating current input default phase alarm hardware circuit, includes step-down rectifier unit, sampling judgement unit and isolation output unit, step-down rectifier unit includes first step-down current-limiting module, second step-down current-limiting module, third step-down current-limiting module and three-phase rectifier bridge, and the input of first step-down current-limiting module, the input of second step-down current-limiting module, the input of third step-down current-limiting module are external three-phase power ' S R, S, T port respectively, sampling judgement unit includes voltage stabilizing module and resistance R11, it includes opto-coupler PC1 to keep apart output unit, the output of first step-down current-limiting module, the output of second step-down current-limiting module, the output of third step-down current-limiting module all with the input of three-phase rectifier bridge is connected, the anodal output of three-phase rectifier bridge with voltage stabilizing module connects, the output of voltage stabilizing module with the transmitting terminal anode connection of opto-coupler PC1, the transmitting terminal cathode of opto-coupler PC1 with the one end of resistance R11 is connected, the other end of resistance R11 with the cathode output of three-phase rectifier bridge, the receiving terminal of PC1 ' S, the opto-coupler power supply, the receiving terminal of opto-coupler PC1 ' S collecting electrode is connected with the opto-coupler PC1 emitter output signal control emitter.
Wherein, first step-down current-limiting module includes resistance R1, resistance R2 and resistance R3, second step-down current-limiting module includes resistance R4, resistance R5 and resistance R6, third step-down current-limiting module includes resistance R7, resistance R8 and resistance R9, resistance R1 resistance R2 and resistance R3 establishes ties in proper order, the external three phase current ' S of resistance R1R port, resistance R3 with the input of three-phase rectifier bridge is connected, resistance R4 resistance R5 with resistance R6 establishes ties in proper order, the external three phase current ' S of resistance R4S port, resistance R6 with the input of three-phase rectifier bridge is connected, resistance R7 resistance R8 and resistance R9 establishes ties in proper order, the external three phase current ' S of resistance R7T port, resistance R9 with the input of three-phase rectifier bridge is connected.
The three-phase rectifier bridge comprises a double-diode series array D1, a double-diode series array D2 and a double-diode series array D3, wherein the double-diode series array D1, the double-diode series array D2 and the double-diode series array D3 are provided with an input pin 1 and an output pin 2, pins 3 are arranged between two serially connected diodes of the double-diode series array D1, between two serially connected diodes of the double-diode series array D2 and between two serially connected diodes of the double-diode series array D3, the pin 3 of the double-diode series array D1, the pin 3 of the double-diode series array D2 and the pin 3 of the double-diode series array D3 are respectively connected with an output end of a first current-limiting voltage-reducing module, an output end of a second voltage-reducing current-limiting module and an output end of a third voltage-reducing module, the output pin 2 of the double-diode series array D1, the pin 2 of the double-diode series array D2 and the pin 2 of the double-diode series array D3 are connected with an input pin of the double-diode series array D1, the double-diode series array D1 and a resistor R11, the double-diode series array D1 and the input pin of the double-diode series array D3.
The voltage stabilizing module comprises a voltage stabilizing diode DZ1 and a voltage stabilizing diode DZ2, the voltage stabilizing diode DZ1 is connected with the voltage stabilizing diode DZ2 in series, the positive output end of the three-phase rectifier bridge is connected with the voltage stabilizing diode DZ1, and the voltage stabilizing diode DZ2 is connected to the positive electrode of the transmitting end of the optocoupler PC 1.
And R10 is connected in series between the positive electrode of the transmitting end of the optocoupler PC1 and the negative electrode of the transmitting end of the optocoupler PC 1.
And an emitter of a receiving end of the optocoupler PC1 is connected with a pull-down resistor R12.
The utility model has the advantages that: the utility model discloses novel structure, design benefit directly do the monitoring to three-phase electricity input interface RST state, and the detection circuitry does not receive generating line energy storage electric capacity to influence, and the response is rapid to can distinguish the alarm type for lacking the looks or the trouble that opens circuit.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic diagram of the output waveform of the optocoupler PC1 when the R, S, T port inputs are normal.
Fig. 3 is the utility model discloses a when R, S, T port lack a looks, opto-coupler PC1 output waveform schematic diagram.
Fig. 4 is the utility model discloses a when R, S, T port lack double-phase or fall the electricity, opto-coupler PC1 output waveform schematic diagram.
Fig. 5 is the utility model discloses a when R, S, T port input are undervoltage, opto-coupler PC1 output waveform schematic.
Reference numerals are as follows: 1. the rectifier circuit comprises a voltage reduction and rectification unit, 2, a voltage stabilization module, 11, a first voltage reduction and current limitation module, 12, a second voltage reduction and current limitation module, 13, a third voltage reduction and current limitation module, 14 and a three-phase rectifier bridge.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
The utility model provides a three-phase alternating current input lacks looks alarm hardware circuit, as shown in fig. 1-5, including step-down rectifier unit 1, sampling judgement unit and isolation output unit, step-down rectifier unit 1 includes first step-down current-limiting module 11, second step-down current-limiting module 12, third step-down current-limiting module 13 and three-phase rectifier bridge 14, the input of first step-down current-limiting module 11, the input of second step-down current-limiting module 12, the input of third step-down current-limiting module 13 external three-phase power' S R, S, T port respectively, sampling judgement unit includes voltage stabilizing module 2 and resistance R11, isolation output unit includes opto-coupler PC1, the output of first step-down current-limiting module 11, the output of second step-down current-limiting module 12, the output of third step-down current-limiting module 13 all with the input of three-phase rectifier bridge 14 is connected, the anodal output of three-phase rectifier bridge 14 with 2 is connected, the output of voltage stabilizing module 2 with the transmitting terminal anodal of PC1 is connected, the transmitting terminal negative pole of PC1 with the one end of opto-coupler R11 is connected, the other end of resistor R11 with the receiving terminal of opto-coupler PC1 is connected the emitter of the output of the three-phase rectifier bridge, the receiving terminal of the three-phase rectifier bridge output of the output of opto-coupler PC 1. Specifically, the voltage stabilizing module comprises a plurality of serially connected voltage stabilizing diodes, and is characterized in that the voltage stabilizing module comprises a plurality of serially connected voltage stabilizing diodes, a first voltage reducing and current limiting module 11, a second voltage reducing and current limiting module 12 and a third voltage reducing and current limiting module 13 are used for reducing and limiting the voltage of R, S and T ports respectively, so as to prevent a rear-stage diode, overvoltage and overcurrent failures of devices such as an optical coupler and the like, a three-phase rectifier bridge 14 rectifies an alternating current signal after the voltage reducing and current limiting, thereby ensuring that a rear-stage optical coupler PC1 and the voltage stabilizing module are always in a forward bias state, and the optical coupler PC1 electrically isolates a strong current end of R, S and T input and a system control unit of a weak current end. When the input of the R, S and T ports is normal, the rectified voltage continuously enables the optocoupler to keep an on state, and the optocoupler emitter outputs a continuous high-level signal; when the input of the R, S and T ports is in fault of any phase, the optocoupler is in an alternate conduction state, and the emitter of the optocoupler outputs periodic square wave signals; when any two phases are absent from the R, S and T ports or a power failure occurs, the optocoupler is in a closed state; when the input voltage of the R, S and T ports is lower than the threshold value, the rectified voltage cannot reach the stable voltage of the voltage stabilizing module, or the current after reverse breakdown of the voltage stabilizing module cannot drive the light emitting diode of the optocoupler PC1, the optocoupler is in a turn-off state, the optocoupler emitting electrode outputs a continuous low level signal, the RST input state is not judged by the circuit at the moment, and the RST input state is uniformly judged to be under-voltage to avoid misjudgment. The utility model discloses novel structure, design benefit directly do the monitoring to three-phase electricity input interface RST state, and detection circuitry does not receive generating line energy storage electric capacity to influence, and the response is rapid to can distinguish the alarm type for lacking the looks or the trouble that opens circuit
This example a three-phase alternating current input lacks looks alarm hardware circuit, first step-down current-limiting module 11 includes resistance R1, resistance R2 and resistance R3, second step-down current-limiting module 12 includes resistance R4, resistance R5 and resistance R6, third step-down current-limiting module 13 includes resistance R7, resistance R8 and resistance R9, resistance R1 resistance R2 and resistance R3 establishes ties in proper order, resistance R1 external three-phase power 'S R port, resistance R3 with three-phase rectifier bridge 14' S input is connected, resistance R4 resistance R5 with resistance R6 establishes ties in proper order, resistance R4 external three-phase power 'S S port, resistance R6 with three-phase rectifier bridge 14' S input is connected, resistance R7 resistance R8 and resistance R9 establishes ties in proper order, resistance R7 external three-phase power 'S T port, resistance R9 with three-phase rectifier bridge 14' S input is connected.
This example a three-phase alternating current input lacks looks alarm hardware circuit, three-phase rectifier bridge 14 includes two diode series array D1, two diode series array D2 and two diode series array D3, two diode series array D1 two diode series array D2 and two diode series array D3 all are provided with input pin 1 foot and output pin 2 foot, between two diodes of two series connections of two diode series array D1, between two diodes of two series connections of two diode series array D2 and all be provided with pin 3 foot between two diodes of two series connections of two diode series array D3, two diode series array D1's pin 3 foot, two diode series array D2's pin 3 foot and two diode series array D3's pin 3 foot respectively with the output of first step-down current-limiting module 11, the output of second step-down current-limiting module 12, the output of third step-down current-limiting module 13 connect, two diode series array D1's output pin 2 foot, two diode series array D2's output pin 2 and two diode series connection array D3's output pin connect respectively with the input pin 1 of two diode series connection current-limiting module 2D 1, two diode series connection input pin 3 input pin 1, two diode series connection current-limiting module 2 connect. Specifically, the double diode array adopts a diode array BAV99 in series connection, and the reverse withstand voltage value is 100V.
The voltage stabilizing module comprises a voltage stabilizing diode DZ1 and a voltage stabilizing diode DZ2, the voltage stabilizing diode DZ1 is connected with the voltage stabilizing diode DZ2 in series, the positive output end of the three-phase rectifier bridge 14 is connected with the voltage stabilizing diode DZ1, and the voltage stabilizing diode DZ2 is connected to the positive electrode of the transmitting end of the optocoupler PC 1. Specifically, the breakdown zener diode DZ1 and the zener diode DZ2 can drive the light emitting diode of the optocoupler PC 1.
In the hardware circuit for the three-phase alternating current input open-phase alarm, R10 is connected in series between the positive electrode of the transmitting end of the optocoupler PC1 and the negative electrode of the transmitting end of the optocoupler PC 1. Specifically, the above arrangement improves the noise immunity of the transmitting end of the optocoupler PC 1.
In the hardware circuit for the three-phase alternating current input open-phase alarm, an emitter of a receiving end of the optocoupler PC1 is connected with a pull-down resistor R12. Specifically, when the RST input lacks any two phases or has a power failure, the optocoupler is in a closed state, and an output signal of the optocoupler PC1 is clamped to a low level by the pull-down resistor R12 and is kept.
In the example, the input resistors R, S and T are alternating current 380Vac, the maximum fluctuation is +/-20%, the resistors R1-R9 are 2512 packaging patch resistors with the resistance value of 33Kohm and the power of 1W, the tube voltage drops of the diodes D1-D3, the voltage drops of circuits such as an optical coupler and the like are ignored, and the resistors R1-R9 can be regarded as a star connection method. The current values flowing through R1-R3 are equivalent to R4-R6, R7-R9.
When the input voltage fluctuates to the lowest value, the current flowing through the resistors R1-R3 is the minimum:
when the optical coupler is switched on, the minimum current of the light emitting diode flowing through the optical coupler PC1 is as follows:
a resistance voltage reduction network formed by 33Kohm resistance values is selected to meet the use requirements of the general optical coupler;
when the input voltage fluctuates to the peak value, the power consumption of the voltage reduction resistance network is highest:
considering the application of resistor derating, 1W resistor is selected to meet the application requirement.
The isolation voltage of the optocoupler PC1 is 5000Vrms, the CTR is more than 200%, and the isolation voltage is LTV-817C and the like.
The zener diode DZ1 and the zener diode DZ2 in this example are both 500mW zener diodes with a stability value of 18V connected in series.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention is disclosed in the above description in terms of preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art will be able to make any changes or modifications to equivalent embodiments without departing from the scope of the present invention, and all the technical solutions of the present invention are within the scope of the present invention.
Claims (6)
1. A three-phase alternating current input phase failure alarm hardware circuit is characterized in that: the device comprises a voltage reduction rectifying unit, a sampling judgment unit and an isolation output unit, wherein the voltage reduction rectifying unit comprises a first voltage reduction current-limiting module, a second voltage reduction current-limiting module, a third voltage reduction current-limiting module and a three-phase rectifier bridge, the input end of the first voltage reduction current-limiting module, the input end of the second voltage reduction current-limiting module and the input end of the third voltage reduction current-limiting module are respectively connected with the R, S and T ports of a three-phase power supply, the sampling judgment unit comprises a voltage stabilization module and a resistor R11, the isolation output unit comprises an optocoupler PC1, the output end of the first voltage reduction current-limiting module, the output end of the second voltage reduction current-limiting module and the output end of the third voltage reduction current-limiting module are connected with the input end of the three-phase rectifier bridge, the anode output end of the three-phase rectifier bridge is connected with the voltage stabilization module, the output end of the voltage stabilization module is connected with the anode of the transmitting end of the optocoupler PC1, the cathode of the transmitting end of the optocoupler PC1 is connected with one end of the resistor R11, the other end of the resistor R11 is connected with the cathode output end of the negative output of the negative electrode of the three-phase rectifier bridge, the power supply of the optocoupler PC1, the emitter of the PC1, and the emitter of the power supply, and the emitter of the PC1 outputs a control signal.
2. The hardware circuit for alarming phase loss of three-phase alternating current input according to claim 1, wherein: first step-down current-limiting module includes resistance R1, resistance R2 and resistance R3, second step-down current-limiting module includes resistance R4, resistance R5 and resistance R6, third step-down current-limiting module includes resistance R7, resistance R8 and resistance R9, resistance R1 resistance R2 and resistance R3 establishes ties in proper order, the external three phase power ' S of resistance R1R port, resistance R3 with the input of three-phase rectifier bridge is connected, resistance R4 resistance R5 with resistance R6 establishes ties in proper order, the external three phase power ' S of resistance R4S port, resistance R6 with the input of three-phase rectifier bridge is connected, resistance R7 resistance R8 and resistance R9 establishes ties in proper order, the external three phase power ' S of resistance R7T port, resistance R9 with the input of three-phase rectifier bridge is connected.
3. The hardware circuit for alarming phase loss of three-phase alternating current input according to claim 1, wherein: the three-phase rectifier bridge includes two diode series array D1, two diode series array D2 and two diode series array D3, two diode series array D1 two diode series array D2 and two diode series array D3 all are provided with input pin 1 foot and output pin 2 feet, between two diodes of two series connection of two diode series array D1, between two diodes of two series connection of two diode series array D2 and all be provided with pin 3 foot between two diodes of two series connection of two diode series array D3, two diode series array D1's pin 3 foot, two diode series array D2's pin 3 foot and two diode series array D3's pin 3 foot connect with the output of first step-down current-limiting module, the output of second step-down current-limiting module, third step-down current-limiting module's output respectively, two diode series array D1's output pin 2 foot, two diode series array D2's output pin 2 foot and two diode series array D3's output pin 2 foot connect the back of connecting the steady voltage diode series array D1, two diode series array D1 and two diode series array D3's input pin 11 input pin are all connected with the input diode series array D1 foot and the input diode series connection.
4. The hardware circuit for alarming phase loss of three-phase alternating current input according to claim 1, wherein: the voltage stabilizing module comprises a voltage stabilizing diode DZ1 and a voltage stabilizing diode DZ2, the voltage stabilizing diode DZ1 is connected with the voltage stabilizing diode DZ2 in series, the positive output end of the three-phase rectifier bridge is connected with the voltage stabilizing diode DZ1, and the voltage stabilizing diode DZ2 is connected to the positive electrode of the transmitting end of the optocoupler PC 1.
5. The hardware circuit for alarming the phase loss of a three-phase alternating current input as claimed in claim 1, wherein: and R10 is connected in series between the positive electrode of the transmitting end of the optocoupler PC1 and the negative electrode of the transmitting end of the optocoupler PC 1.
6. The hardware circuit for alarming phase loss of three-phase alternating current input according to claim 1, wherein: and an emitter of a receiving end of the optocoupler PC1 is connected with a pull-down resistor R12.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221315885.0U CN217879480U (en) | 2022-05-27 | 2022-05-27 | Three-phase alternating current input phase-failure alarm hardware circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221315885.0U CN217879480U (en) | 2022-05-27 | 2022-05-27 | Three-phase alternating current input phase-failure alarm hardware circuit |
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| CN217879480U true CN217879480U (en) | 2022-11-22 |
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|---|---|---|---|
| CN202221315885.0U Active CN217879480U (en) | 2022-05-27 | 2022-05-27 | Three-phase alternating current input phase-failure alarm hardware circuit |
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| CN (1) | CN217879480U (en) |
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- 2022-05-27 CN CN202221315885.0U patent/CN217879480U/en active Active
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