CN115528663A - Low-voltage anti-falling power supply breaker - Google Patents

Low-voltage anti-falling power supply breaker Download PDF

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Publication number
CN115528663A
CN115528663A CN202211189015.8A CN202211189015A CN115528663A CN 115528663 A CN115528663 A CN 115528663A CN 202211189015 A CN202211189015 A CN 202211189015A CN 115528663 A CN115528663 A CN 115528663A
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CN
China
Prior art keywords
voltage
power supply
power
low
electrically connected
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Pending
Application number
CN202211189015.8A
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Chinese (zh)
Inventor
王翎羽
郭宁
曾君
何伟辉
袁宇昊
曹雪亮
孙成功
叶子程
林楠
王锦朝
刘淡玲
李文博
何斯洁
丘桢坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Application filed by Guangdong Power Grid Co Ltd, Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Guangdong Power Grid Co Ltd
Priority to CN202211189015.8A priority Critical patent/CN115528663A/en
Publication of CN115528663A publication Critical patent/CN115528663A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/266—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving switching on a spare supply

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  • Emergency Protection Circuit Devices (AREA)

Abstract

The embodiment of the invention discloses a low-voltage anti-reverse power supply breaker, which comprises a voltage loss detection circuit, a voltage loss detection circuit and a power supply circuit, wherein the voltage loss detection circuit is electrically connected with a power supply side and is used for outputting a high level when the power supply side is not subjected to voltage loss and outputting a low level when the power supply side is subjected to voltage loss; the OR gate circuit comprises a first OR gate input end, a second OR gate input end and an OR gate output end, and the first OR gate input end is electrically connected with the output end of the voltage loss detection circuit; the control end of the switching-on and switching-off control coil is electrically connected with the output end of the OR gate and is used for controlling the switching-on of the low-voltage main switch and communicating the power supply side and the load side when the output end of the OR gate is at a high level and controlling the switching-off of the low-voltage main switch and disconnecting the power supply side and the load side when the output end of the OR gate is at a low level; wherein the low level is less than the high level. The embodiment of the invention discloses a low-voltage anti-falling power supply breaker, which aims to improve the operation safety of operation and maintenance personnel and greatly reduce the risk of maintenance personnel in the operation process.

Description

Low-voltage anti-falling power supply breaker
Technical Field
The invention relates to the field of circuit control, in particular to a low-voltage anti-reverse power supply breaker.
Background
With the development of distribution network construction, the distributed power supply develops rapidly, wherein the photovoltaic distributed power generation, the wind power distributed power generation, the spare power automatic switching devices in factories and large and medium-sized enterprises, large-sized communities and important power protection units are built with own power generation equipment, so that the requirement of complete power failure of lines cannot be met by a traditional single power supply disconnection point.
Because the accidents of low-voltage reverse power transmission occur frequently, the reported safety case study includes the case that the live working of the overhaul operating personnel causes the death of the operating personnel due to the low-voltage reverse power transmission. With the continuous updating and upgrading of the power grid, the maintenance operation is gradually increased, and more tragedies can be caused without the prevention of power supply from being over-voltage.
Switch separating brake one by one during the power failure and switch closing power transmission one by one during power transmission obviously do not accord with the engineering requirement, and the operating time is greatly wasted, increases the perception that the user has a power failure, and increases the time length of having a power failure, leads to user's power consumption to experience and reduces.
Disclosure of Invention
The embodiment of the invention provides a low-voltage anti-falling power supply breaker, which is used for automatically controlling the on-off of a low-voltage main switch, improving the operation safety of operation and maintenance personnel and reducing the risk of the maintenance personnel in the operation process.
According to an aspect of the present invention, there is provided a low voltage back-off prevention power supply interrupter, including:
the voltage loss detection circuit is electrically connected with a power supply side and used for outputting a high level when the power supply side is not subjected to voltage loss and outputting a low level when the power supply side is subjected to voltage loss;
the OR gate circuit comprises a first OR gate input end, a second OR gate input end and an OR gate output end, and the first OR gate input end is electrically connected with the output end of the voltage loss detection circuit;
the control end of the switching-on and switching-off control coil is electrically connected with the output end of the OR gate and is used for controlling the low-voltage main switch to be switched on and communicated with the power supply side and the load side when the output end of the OR gate is at a high level and controlling the low-voltage main switch to be switched off and disconnected with the power supply side and the load side when the output end of the OR gate is at a low level;
wherein the low level is less than the high level.
Optionally, the load further includes a current direction protection circuit, configured to detect a current direction of the load side, output a high level when the current direction is a positive direction, and output a low level when the current direction is a negative direction; the output end of the current direction protection circuit is electrically connected with the input end of the second OR gate;
when the power supply side and the load side are communicated, the current direction is in a positive direction from the power supply side to the load side.
Optionally, the voltage loss detection circuit includes:
the control end of the no-voltage detection switch unit is electrically connected with the first no-voltage detection contact, when the first no-voltage detection contact is in contact with the second no-voltage detection contact, the no-voltage detection switch unit is switched on, high level is transmitted to the output end of the no-voltage detection circuit, when the first no-voltage detection contact is separated from the second no-voltage detection contact, the no-voltage detection switch unit is cut off, and the output end of the no-voltage detection circuit is low level.
Optionally, the voltage-loss detection switch unit includes:
the non-inverting input end of the operational amplifier is electrically connected with the high-level power supply, the inverting input end of the operational amplifier is electrically connected with the first no-voltage detection contact, and the output end of the operational amplifier is the output end of the no-voltage detection circuit.
Optionally, the lock further comprises a power loss detection lock and an electromagnetic coil surrounding the power loss detection lock;
the first end of the electromagnetic coil is electrically connected with the power supply side;
the power-loss detection lock is switched on according to the electromagnetic field generated by the electromagnetic coil and is switched off after the electromagnetic field of the electromagnetic coil disappears, so that the second power-loss detection contact is in contact with or separated from the first power-loss detection contact.
Optionally, the electromagnetic coil further comprises a resistor and a capacitor, a first end of the resistor is electrically connected with a second end of the electromagnetic coil, a second end of the resistor is electrically connected with a first polar plate of the capacitor, and a second polar plate of the capacitor is grounded.
Optionally, the current direction protection circuit includes a current transformer, a voltage transformer and a power direction detector;
the current transformer is used for transmitting the detected current information of the load side to the power direction detector;
the voltage transformer is used for transmitting the detected voltage information of the power supply side to the power direction detector;
the power direction detector transmits a high level to the output terminal of the current direction protection circuit when the current direction is a positive direction, and transmits a low level to the output terminal of the current direction protection circuit when the current direction is a negative direction.
Optionally, the current direction protection circuit further includes a signal transmission coil, and the signal transmission coil is connected in series between the current transformer and the power direction detector.
Optionally, the power supply further comprises a time relay, a signal transmission switch, a power direction switch and a time relay switch;
the control end of the signal transmission switch is electrically connected with the output end of the signal transmission coil, the control end of the power direction switch is electrically connected with the output end of the power direction detector, and the control end of the time relay switch is electrically connected with the output end of the time relay;
and the control end of the time relay is connected with a high-level power supply through the signal transmission switch and the power direction switch.
Optionally, the device further comprises a voltage keeper and a voltage keeping switch;
the control end of the voltage holding switch is electrically connected with the output end of the voltage holder;
and the control end of the voltage retainer is connected to the high-level power supply through the time relay switch.
The low-voltage anti-falling power supply interrupter provided by the embodiment of the invention comprises a voltage loss detection circuit, a voltage loss detection circuit and a voltage loss detection circuit, wherein the voltage loss detection circuit is electrically connected with a power supply side and is used for outputting a high level when the power supply side is not in voltage loss and outputting a low level when the power supply side is in voltage loss; the OR gate circuit comprises a first OR gate input end, a second OR gate input end and an OR gate output end, and the first OR gate input end is electrically connected with the output end of the voltage loss detection circuit; the control end of the switching-on and switching-off control coil is electrically connected with the output end of the OR gate and is used for controlling the switching-on of the low-voltage main switch and communicating the power supply side and the load side when the output end of the OR gate is at a high level and controlling the switching-off of the low-voltage main switch and disconnecting the power supply side and the load side when the output end of the OR gate is at a low level; wherein the low level is less than the high level. According to the embodiment of the invention, the voltage loss detection circuit is arranged to detect whether the power supply side is in voltage loss or not, and then the signal is output to the switching-on and switching-off control coil through the OR gate circuit, so that the on-off of the low-voltage main switch is automatically controlled, the operation safety of operation and maintenance personnel is improved, and the risk of the maintenance personnel in the operation process is greatly reduced.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a low-voltage anti-backup power supply interrupter provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another low-voltage anti-backup power supply interrupter provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a voltage loss detection circuit of a low-voltage anti-backup power interrupter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a voltage loss detection circuit of a low-voltage anti-backup power interrupter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another low-voltage anti-backup power supply interrupter according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a low-voltage anti-falling power supply interrupter provided in an embodiment of the present invention, and referring to fig. 1, the low-voltage anti-falling power supply interrupter includes a voltage loss detection circuit 100, an or gate circuit 200, an opening/closing control coil 300, and a low-voltage main switch 400. The voltage loss detection circuit 100 is electrically connected to the power supply side, and the voltage loss detection circuit 100 is configured to output a high level when the power supply side is not voltage-lost and output a low level when the power supply side is voltage-lost. Or gate circuit 200 includes a first or input electrically coupled to an output of voltage loss detection circuit 100, a second or input and a or output. Receives the output signal of the voltage loss detection circuit 100. The or gate output of or gate circuit 200 outputs a high level as long as the signal of at least one of the first or gate input and the second or gate input is a high level signal. Otherwise, the output of the or gate circuit 200 outputs a low level. The control end of the switching-on and switching-off control coil 300 is electrically connected with the output end of the OR gate, the switching-on and switching-off control coil 300 is used for controlling the low-voltage main switch 400 to be switched on to connect the power supply side and the load side when the output end of the OR gate is at a high level, and controlling the low-voltage main switch 400 to be switched off to disconnect the power supply side and the load side when the output end of the OR gate is at a low level. Wherein the low level is less than the high level. The high level and the low level can be both positive voltages and both negative voltages; alternatively, the high level is a positive voltage and the low level is a negative voltage. Alternatively, the low level is represented as 0 and the high level is represented as 1.
Fig. 2 is a schematic structural diagram of another low-voltage anti-falling power supply interrupter according to an embodiment of the present invention, referring to fig. 2, the low-voltage anti-falling power supply interrupter further includes a current direction protection circuit 500, where the current direction protection circuit 500 is configured to detect a current direction of a load side, output a high level when the current direction is a positive direction, and output a low level when the current direction is a negative direction. An output of current direction protection circuit 500 is electrically coupled to a second or input of or gate circuit 200. When the power supply side and the load side are connected, the current direction is in a forward direction from the power supply side to the load side. It is understood that when the power source side and the load side are not connected (i.e., disconnected), the direction of the current flowing from the load side is a forward direction and the direction of the current flowing from the load side is a reverse direction.
Referring to fig. 2, a current direction protection circuit 500 is used to detect a current direction on a load side. When detecting that the load-side current direction is the forward direction, the current direction protection circuit 500 outputs a high level. When detecting that the load-side current direction is negative, the current direction protection circuit 500 outputs a low level. When the power supply side and the load side are connected, the current direction is in a forward direction from the power supply side to the load side. And vice versa, negative. The output of current direction protection circuit 500 is electrically connected to a second or input of or gate circuit 200, and the output of current direction protection circuit 500 transmits the output signal to the second or input of or gate circuit 200.
Fig. 3 is a schematic structural diagram of a voltage loss detection circuit of a low voltage anti-backup power interrupter according to an embodiment of the present invention, and referring to fig. 3, the voltage loss detection circuit 100 includes a voltage loss detection switch unit 101. The control end of the no-voltage detection switch unit 101 is electrically connected to the first no-voltage detection contact 102, and when the first no-voltage detection contact 102 contacts the second no-voltage detection contact 105, the no-voltage detection switch unit 101 is turned on to transmit a high level to the output end of the no-voltage detection circuit 100. When the first no-voltage detection contact 102 and the second no-voltage detection contact 105 are separated, the no-voltage detection switch unit 101 is turned off, and the output terminal of the no-voltage detection circuit 100 is at a low level.
Illustratively, referring to fig. 3, when the first and second no- voltage detection contacts 102 and 105 are separated, a low level is transmitted to the output terminal of the no-voltage detection circuit 100 and is input to the first or input terminal of the or gate circuit 200.
Fig. 4 is a schematic structural diagram of a voltage loss detection circuit of a low-voltage anti-falling power supply interrupter according to an embodiment of the present invention, referring to fig. 4, a first voltage loss detection contact 102 contacts with a second voltage loss detection contact 105, a high level is transmitted to an output end of the voltage loss detection circuit 100, a control end of a switching control coil 300 is further controlled to be a high level by an or gate circuit 200, and the switching control coil 300 controls a low-voltage main switch 400 to be switched on.
Illustratively, referring to fig. 3 and 4, the voltage loss detection switching unit 101 includes a triode. In other embodiments, the voltage loss detection switch unit 101 includes a switching device such as an operational amplifier.
Optionally, in an embodiment, the voltage loss detection switch unit 101 includes an operational amplifier, a non-inverting input terminal of the operational amplifier is electrically connected to the high-level power supply, an inverting input terminal of the operational amplifier is electrically connected to the first voltage loss detection contact 102, and an output terminal of the operational amplifier is an output terminal of the voltage loss detection circuit 100.
The operational amplifier has a same-direction input end, an opposite-phase input end and an output end, and the output signal of the operational amplifier is in direct proportion to the signal voltages of the two input ends, namely an output voltage U 0 ＝A 0 (E 1 -E 2 ) Wherein A is 0 Is the open loop gain of the operational amplifier, E 1 Is the signal voltage of the equidirectional input terminal, E 2 Is the signal voltage at the inverting input. The non-inverting input terminal of the operational amplifier is electrically connected with the high-level power supply, and the inverting input terminal of the operational amplifier is in contact with the first voltage loss detectionThe point 102 is electrically connected to receive the electrical signal from the first no-voltage detecting contact 102, and the electrical signal from the same-direction input terminal and the opposite-direction input terminal can be used to obtain the output end signal of the operational amplifier, which is the output end electrical signal of the no-voltage detecting circuit 100. The operational amplifier has low cost and strong universality.
Optionally, referring to fig. 3 and 4, the voltage loss detection circuit 100 further includes a voltage loss detection lock 103 and a solenoid 104 surrounding the voltage loss detection lock 103. A first end of the electromagnetic coil 104 is electrically connected to the power supply side. The power loss detection lock 103 is switched on according to an electromagnetic field generated by the electromagnetic coil 104, and is switched off after the electromagnetic field of the electromagnetic coil 104 disappears, so that the second power loss detection contact 105 is brought into contact with or separated from the first power loss detection contact 102.
Illustratively, referring to fig. 3, the power loss detecting lock 103 detects whether the power supply side is voltage-lost by the electromagnetic coil 104 surrounding the power loss detecting lock 103. When the power supply side loses voltage, the electromagnetic coil 104 is not electrified, the electromagnetic field disappears, the power loss detection lock 103 is switched off, and the second power loss detection contact 105 is separated from the first power loss detection contact 102.
Illustratively, referring to fig. 4, when the power supply side is not de-energized, the electromagnetic coil 104 is energized to generate an electromagnetic field, and the de-energizing detection lock 103 is closed in accordance with the electromagnetic field generated by the electromagnetic coil 104. Thereby bringing the second no-voltage detection contact 105 into contact with the first no-voltage detection contact 102. The detection of the voltage loss on the power supply side is simple and convenient without manual participation by arranging the power loss detection lock 103, the electromagnetic coil 104 surrounding the power loss detection lock 103 and the second voltage loss detection contact 105.
Optionally, the voltage loss detection circuit 100 further includes a resistor 106 and a capacitor 107, a first end of the resistor 106 is electrically connected to a second end of the electromagnetic coil 104, a second end of the resistor 106 is electrically connected to a first plate of the capacitor 107, and a second plate of the capacitor 107 is grounded. In the embodiment of the present invention, the second end of the electromagnetic coil 104 is connected in series with the capacitor 107 through the resistor 106 and then grounded, which mainly functions to eliminate the peak voltage and protect the circuit, so that the circuit stably and normally works.
Fig. 5 is a schematic structural diagram of another low-voltage anti-backup power supply interrupter according to an embodiment of the present invention, and referring to fig. 5, a current direction protection circuit 500 includes a current transformer 501, a voltage transformer 502, and a power direction detector 503. The current transformer 501 is used to transmit the detected current information of the load side to the power direction detector 503. The current transformer 501 is an instrument for measuring a large primary current by converting it into a small secondary current according to the electromagnetic induction principle. The primary side winding of the transformer has few turns and is connected in series with a load side, and the secondary side winding of the transformer has more turns and is connected in series with a measuring instrument and a protection loop. The current transformer 501 converts a large current measured on the primary side into a small current on the secondary side for measurement, thereby protecting the circuit. Further, the secondary side of the current transformer 501 transmits the measured current information to the power direction detector 503. The voltage transformer 502 is used to transmit the detected voltage information of the power supply side to the power direction detector 503. The primary windings of the voltage transformers 502 are connected in parallel to the power source side line, and the secondary windings are connected in parallel to the power direction detector 503. The voltage transformer 502 ensures that when the voltage on the line on the high-voltage power supply side is measured, the secondary side is low voltage, and the safety of instruments is ensured. Further, the secondary side of the voltage transformer 502 transmits the measured voltage information to the power direction detector 503.
Referring to fig. 5, the power direction detector 503 transmits a high level to the output terminal of the current direction protection circuit 500 when the current direction is a positive direction, and transmits a low level to the output terminal of the current direction protection circuit 500 when the current direction is a negative direction. The power direction detector 503 calculates the power value mainly based on the current signal and the voltage signal transmitted from the current transformer 501 and the voltage transformer 502. When the current direction is positive, that is, the power supply side supplies power to the load side, and the power value is positive, the high level is transmitted to the output end of the current direction protection circuit 500. When the current direction is negative, that is, the load side supplies power to the power supply side reversely, and the power value is a negative value, the low level is transmitted to the output end of the current direction protection circuit 500.
Optionally, referring to fig. 5, the current direction protection circuit 500 further includes a signal transmission coil 504, and the signal transmission coil 504 is connected in series between the current transformer 501 and the power direction detector 503. The signal transmission coil 504 transmits the current signal measured by the current transformer 501 to the power direction detector 503, and plays a role of signal transmission. The signal transmission coil 504 may be a current relay, and has the advantages of simple wiring, rapid and reliable action, convenient maintenance, long service life, and the like.
Optionally, referring to fig. 5, the current direction protection circuit 500 further includes a time relay 505, a signal transfer switch 506, a power direction switch 507, and a time relay switch 508. A control terminal of the signal transmission switch 506 is electrically connected to an output terminal of the signal transmission coil 504, a control terminal of the power direction switch 507 is electrically connected to an output terminal of the power direction detector 503, and a control terminal of the time relay switch 508 is electrically connected to an output terminal of the time relay 505. The control terminal of the time relay 505 is connected to the high level power supply through a signal transfer switch 506 and a power direction switch 507. After receiving the input action signal, the time relay 505 has to delay the output end of the time relay by a predetermined time to generate an action. The delay time of the time relay 505 can be adjusted within the range of the delay time, so that the delay time can be conveniently adjusted. The control terminal of the signal transfer switch 506 is electrically connected to the output terminal of the signal transfer coil 504, and the signal transfer switch 506 is closed during normal operation. When the signal transmission coil 504 detects that the current signal measured by the current transformer 501 is too large, the signal transmission switch 506 is controlled to be switched off, and the circuit is protected. The control terminal of the power direction switch 507 is electrically connected to the output terminal of the power direction detector 503, and the power direction switch 507 is closed during normal operation. When the power direction detector 503 detects that the power value is negative, the power direction switch 507 is controlled to be turned off. The control end of the time relay switch 508 is electrically connected with the output end of the time relay 505, and the time relay switch 508 is closed during normal operation. When the time relay 505 receives the signal that the power direction switch 507 is turned off, the time relay 505 delays for a predetermined time and then controls the time relay switch 508 to be turned off. The control terminal of the time relay 505 is connected to the high level power supply through the signal transmission switch 506 and the power direction switch 507, and when any one of the signal transmission switch 506 and the power direction switch 507 is turned off, the time relay 505 delays within a specified time and then controls the time relay switch 508 to be turned off. Wherein, the voltage provided by the high-level power supply is high level.
Optionally, referring to fig. 5, the current direction protection circuit 500 further includes a voltage holder 509 and a voltage holding switch 510. The control terminal of the voltage holding switch 510 is electrically connected to the output terminal of the voltage holder 509. The control terminal of the voltage keeper 509 is connected to the high level power supply through the time relay switch 508.
Illustratively, referring to fig. 5, the control terminal of the voltage keeper 509 is connected to the high-level power supply through the time relay switch 508, and the output terminal of the voltage keeper 509 is electrically connected to the control terminal of the voltage keeper switch 510. When the relay switch 508 is closed, the voltage keeper 509 maintains a constant voltage, the voltage keeper switch 510 is controlled to keep a closed state, and the current direction protection circuit 500 outputs a high level. When the relay switch 508 is turned off, the voltage holder 509 is operated and then maintained at a constant voltage, the voltage holding switch 510 is controlled to be kept in an off state, and the current direction protection circuit 500 outputs a low level. By arranging the voltage retainer 509 and the voltage retaining switch 510, the current direction protection circuit 500 can stably output an electric signal, and therefore the effect of controlling the low-voltage main switch 400 to be switched on or switched off when the current direction is detected to be a positive value or a negative value is achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a power supply interrupter is prevented falling by low pressure which characterized in that includes:
the voltage loss detection circuit is electrically connected with a power supply side and used for outputting a high level when the power supply side is not subjected to voltage loss and outputting a low level when the power supply side is subjected to voltage loss;
the OR gate circuit comprises a first OR gate input end, a second OR gate input end and an OR gate output end, and the first OR gate input end is electrically connected with the output end of the voltage loss detection circuit;
the control end of the switching-on and switching-off control coil is electrically connected with the output end of the OR gate and is used for controlling the low-voltage main switch to be switched on and communicated with the power supply side and the load side when the output end of the OR gate is at a high level and controlling the low-voltage main switch to be switched off and disconnected with the power supply side and the load side when the output end of the OR gate is at a low level;
wherein the low level is less than the high level.
2. The low voltage supply backup prevention circuit interrupter as claimed in claim 1, further comprising a current direction protection circuit for detecting a current direction of the load side, outputting a high level when the current direction is a positive direction, and outputting a low level when the current direction is a negative direction; the output end of the current direction protection circuit is electrically connected with the input end of the second OR gate;
when the power supply side and the load side are communicated, the current direction is in a positive direction from the power supply side to the load side.
3. The low voltage supply back-off prevention circuit interrupter as defined in claim 1, wherein the voltage loss detection circuit comprises:
the control end of the no-voltage detection switch unit is electrically connected with the first no-voltage detection contact, when the first no-voltage detection contact is in contact with the second no-voltage detection contact, the no-voltage detection switch unit is switched on, high level is transmitted to the output end of the no-voltage detection circuit, when the first no-voltage detection contact is separated from the second no-voltage detection contact, the no-voltage detection switch unit is cut off, and the output end of the no-voltage detection circuit is low level.
4. The low voltage supply back-proof circuit breaker according to claim 3, wherein the voltage loss detection switch unit comprises:
the non-inverting input end of the operational amplifier is electrically connected with the high-level power supply, the inverting input end of the operational amplifier is electrically connected with the first no-voltage detection contact, and the output end of the operational amplifier is the output end of the no-voltage detection circuit.
5. The low voltage power supply reversal prevention circuit breaker according to claim 3, further comprising a power loss detection lock and an electromagnetic coil surrounding the power loss detection lock;
the first end of the electromagnetic coil is electrically connected with the power supply side;
the power-loss detection lock is switched on according to the electromagnetic field generated by the electromagnetic coil and is switched off after the electromagnetic field of the electromagnetic coil disappears, so that the second power-loss detection contact is in contact with or separated from the first power-loss detection contact.
6. The low voltage reverse power supply prevention circuit breaker according to claim 5, further comprising a resistor and a capacitor, wherein a first end of the resistor is electrically connected with a second end of the electromagnetic coil, a second end of the resistor is electrically connected with a first pole plate of the capacitor, and a second pole plate of the capacitor is grounded.
7. The low voltage supply back-proof power interrupter as claimed in claim 2, wherein the current direction protection circuit comprises a current transformer, a voltage transformer and a power direction detector;
the current transformer is used for transmitting the detected current information of the load side to the power direction detector;
the voltage transformer is used for transmitting the detected voltage information of the power supply side to the power direction detector;
the power direction detector transmits a high level to the output terminal of the current direction protection circuit when the current direction is a positive direction, and transmits a low level to the output terminal of the current direction protection circuit when the current direction is a negative direction.
8. The low voltage supply back-off prevention circuit interrupter as defined in claim 7, wherein the current direction protection circuit further comprises a signal transfer coil connected in series between the current transformer and the power direction detector.
9. The low voltage back-feed prevention circuit breaker according to claim 8, further comprising a time relay, a signal transmission switch, a power direction switch and a time relay switch;
the control end of the signal transmission switch is electrically connected with the output end of the signal transmission coil, the control end of the power direction switch is electrically connected with the output end of the power direction detector, and the control end of the time relay switch is electrically connected with the output end of the time relay;
and the control end of the time relay is connected to a high-level power supply through the signal transmission switch and the power direction switch.
10. The low voltage supply back-proof circuit breaker according to claim 9, further comprising a voltage keeper and a voltage keeper switch;
the control end of the voltage holding switch is electrically connected with the output end of the voltage holder;
and the control end of the voltage retainer is connected to the high-level power supply through the time relay switch.
CN202211189015.8A 2022-09-28 2022-09-28 Low-voltage anti-falling power supply breaker Pending CN115528663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211189015.8A CN115528663A (en) 2022-09-28 2022-09-28 Low-voltage anti-falling power supply breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211189015.8A CN115528663A (en) 2022-09-28 2022-09-28 Low-voltage anti-falling power supply breaker

Publications (1)

Publication Number Publication Date
CN115528663A true CN115528663A (en) 2022-12-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211189015.8A Pending CN115528663A (en) 2022-09-28 2022-09-28 Low-voltage anti-falling power supply breaker

Country Status (1)

Country Link
CN (1) CN115528663A (en)

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