CN212572056U - Contactless self-recovery device and monostable delay control system - Google Patents
Contactless self-recovery device and monostable delay control system Download PDFInfo
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- CN212572056U CN212572056U CN201922022723.2U CN201922022723U CN212572056U CN 212572056 U CN212572056 U CN 212572056U CN 201922022723 U CN201922022723 U CN 201922022723U CN 212572056 U CN212572056 U CN 212572056U
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Abstract
The utility model provides a non-contact self-recovery device and a monostable delay control system, wherein the non-contact self-recovery device comprises a zero sequence mutual inductor ZCT, an integrated circuit, a rectification circuit, an actuating mechanism, a breaker, a thyristor and an overload self-recovery protection circuit; a power supply of the breaker penetrates through a zero sequence transformer ZCT, and the secondary side of the zero sequence transformer ZCT is connected with the reverse phase input end and the in-phase input end of the operational amplifier in a loop way; the alternating current input end of the rectifying circuit is connected with a power supply of the circuit breaker, and the direct current output end of the rectifying circuit forms a loop by serially connecting the overload self-recovery protection circuit, the actuating mechanism and the thyristor; the overload self-recovery protection circuit comprises a self-recovery fuse; the trigger end of the thyristor is connected with the signal output end of the latch; and a voltage stabilizing circuit is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier. The leakage protection controller has the advantages of being free of maintenance, capable of protecting the leakage protection controller from running reliably, capable of preventing reverse power taking wiring, preventing a circuit PCB from being burnt in an overload mode, preventing the circuit PCB from being burnt out, preventing the circuit PCB from being tripped out, preventing the circuit.
Description
Technical Field
The utility model belongs to the technical field of circuit breaker earth-leakage protector and specifically relates to indicate a contactless self recovery device and applied this self recovery device's monostable time delay control system.
Background
The residual current operated protector is also called leakage protector, leakage switch for short, and is mainly used for detecting leakage fault of power circuit and equipment and for infrequently switching on and off human body electric shock protection devices with fatal danger. The leakage switch is a leakage protection device having a function of detecting and determining leakage current and a function of cutting off a main circuit. The leakage switch is composed of a zero sequence mutual inductor, a signal processing system, a thyristor, an actuating mechanism and the like. As a general protection for low voltage networks or as a leakage, grounding or insulation monitoring protection for the main circuit. Electric shock refers to injury caused by the passage of electric current through the body. When a human body touches the wire and forms a current loop with the ground, the human body has current flowing through; when the current is high, a hazard can form. When an electric shock occurs, the current must be cut off in a short moment to ensure the safety of human body.
Since the utility model electricity is used by human, not only can bring convenience and progress to human, but also can bring disaster relief to human. Burning out the electric appliance, causing fire and causing people to be electrocuted. If there is a device that allows people to use electricity safely, many unnecessary losses will be avoided. Special leakage protectors for human beings were born. Referred to as leakage protection switches. The protection device is mainly used for preventing human body from electric shock and electric fire when the circuit or the electric appliance is damaged and has short circuit to the ground, and is generally arranged at the inlet wire end of a loop power supply.
The development of the earth leakage protector has experienced a long development process so far, and the earth leakage protector is generally used all over the world at present.
The leakage switch is divided into two categories of voltage working leakage action type and current working leakage action type, the utility model mainly takes the voltage working action type as the main.
The residual current of the system is almost zero when the leakage protector operates normally, so the setting value of the action of the leakage protector can be set to be very small (normally in mA level), when a person gets an electric shock or an insulating layer of equipment is damaged, the shell is electrified to generate larger residual current, and the leakage switch operates to cut off a load power supply after detecting and processing the residual current, so that the personal safety is ensured. The leakage switch has high sensitivity and action rapidity in the aspects of reaction electric shock and leakage protection, the working principle of the leakage switch is a short-time transient working system, and a main working circuit comprises an electronic module rectifying circuit, a thyristor switch circuit, a zero sequence mutual inductor signal sampling device and circuit, an actuating mechanism, a circuit breaker and the like.
The power supply of a circuit board module (hereinafter referred to as a control module) of the leakage protection controller is connected with the output end of the circuit breaker, and when the circuit breaker is in a brake-off state, the controller (an electronic module) does not have any power supply in a failure state and has no protection function. When the breaker is in a closing state, the detected circuit automatically enters a standby state under the condition that no abnormity occurs, the thyristor is in a cut-off state, the execution mechanism is in the standby state, and the breaker keeps in the closing state. When the zero sequence transformer detects that the circuit has an abnormal leakage condition, the zero sequence transformer sends out a processed signal and then sends the processed signal to a thyristor trigger (gate) electrode to enable the thyristor to be conducted, an execution mechanism is powered on, a coil generates a magnetic field to move an iron core to act to drive a circuit breaker tripping device, the circuit breaker is disconnected instantly, a controller module is powered off along with the power off, the thyristor voltage is disconnected in a zero-crossing mode, and the controller restores to the original state. The thyristor switch is a direct current control circuit, and the thyristor characteristic direct current is not self-operated and can not be turned off after being turned on, so that the release is in an instantaneous working mode for a long time, the working time is generally within a few seconds, the temperature of a release coil rises sharply when the release coil is electrified for a long time, the resistance value of a coil insulating layer material is damaged, the current is reduced, the temperature is increased sharply, and the coil is burnt. Meanwhile, the current passing through the rectifier diode, the thyristor, the circuit board and the circuit in the circuit is also increased rapidly to burn out.
After long-term investigation and research, the power supplies of control circuit board modules of domestic and foreign leakage protectors are all taken from the output end of the circuit breaker, when an execution mechanism obtains an instruction, an electromagnetic field in a tripper coil instantly sucks a movable iron core, the movable iron core drives a tripping device of the circuit breaker to force the circuit breaker to open, a power-off thyristor of the control circuit board enters a cut-off closing state through zero crossing, and a control circuit recovers the original state.
However, in practical applications, situations such as circuit breaker burnout, rectifier bridge (diode) burnout, thyristor burnout, actuator burnout, PCB circuit board copper foil burnout, circuit board power supply circuit burnout and the like often occur, the situations are problems that people in all countries take measures to be solved urgently, and the purposes of solving are that when a tripping device fails (tripping device working circuit breaker refuses shunt excitation and the tripping device is in a long-term power-on state) when a tripping instruction is sent by a leakage protection controller, the circuit breaker burnout, the rectifier bridge (diode) burnout and the thyristor burnout are prevented, the actuator burnout, the PCB circuit board copper foil burnout and the circuit board power supply circuit burnout are prevented.
When the output end of the earth leakage protection circuit breaker is changed into a power input end (namely reverse connection in the home), on the basis of not changing the original connection mode, when the tripping device fails when the controller sends a tripping instruction (the tripping device works to reject shunt excitation, and the tripping device is in a long-term power-on state at the moment), the circuit breaker is prevented from being burnt out, a rectifier bridge (diode) is prevented from being burnt out, a thyristor is prevented from being burnt out, an execution mechanism is prevented from being burnt out, a copper foil of a PCB (printed circuit board) is prevented from being burnt out, a power circuit of the circuit board is prevented from being burnt out, and.
Mechanical control methods are mostly adopted abroad, for example: when the Mitsubishi circuit breaker is opened, a mechanical actuating mechanism is adopted to forcibly cut off a loop release power supply in a circuit board, so that the problems that when the release working circuit breaker refuses shunt excitation, the output end of the circuit breaker is changed into a power input end (namely reverse wiring in the home-speaking), the circuit breaker, a rectifier diode, a thyristor, the circuit board and the like are not burnt are effectively solved.
The forced power-off method of the mechanical actuating mechanism has the defects of complex structure, high cost, complex assembly process, high fault, easy cremation of mechanical contacts, easy oxidation of the contacts and the like.
So far, the current leakage protection field has serious problems that when the tripper working circuit breaker refuses shunt excitation and the output end of the circuit breaker becomes the power input end (namely reverse connection in the big family), the circuit breaker is burnt, the rectifier diode is burnt, the thyristor is burnt, the circuit board is burnt, and the like, thereby bringing great potential safety hazard to human life and property, and solving the potential safety hazard problem urgently is needed to eliminate the problem in the bud state.
The existing commonly used leakage circuit breakers are divided into a voltage type and a current type, the current type is divided into an electromagnetic type and an electronic type, the leakage circuit breakers are on the market at present, an electronic control module is a called integrated board which takes special leakage integration (encapsulation with a non-delay IC8 pin and encapsulation with a delay IC16 pin) as core control, the integrated board is divided into a delay type and a non-delay type, a thyristor (SCR) is taken as a core, and the called discrete board is not controlled by an integrated circuit IC and can achieve the function of leakage protection.
The non-delay type integrated board mainly has a control module formed by discrete electronic components and an 8-pin packaged Integrated Circuit (IC) without a delay function, and the 8-pin packaged Integrated Circuit (IC) includes: 54123. 54123A, and the like. The functions or the pin functions similar to 54123 are improved on the basis of 54123.
The leakage protection 54123 delay circuit in the market is connected with the input end of the latch in a direct short circuit way at the output end of the operational amplifier, a capacitor is added between the two short circuit connections and the ground wire, and the capacitor is directly charged and discharged. The delay protector and the non-delay protector produced on the market at present are two kinds of integrated circuit IC chips, and the leakage protection chip with the delay function has the defects of high cost (IC16 pin package), large volume, more stocks and the like. The delay type integrated board mainly has a control module formed by a 16-pin packaged Integrated Circuit (IC) with a delay function, and the 16-pin packaged Integrated Circuit (IC) has the following examples: 54133. 54133A, and so on.
The leakage protector frequently appears the mistake operating phenomenon of stepping over in the existing market, specifically for safe and reliable reasonable power consumption: the circuit protection is divided into a first-level protection, a second-level protection, a third-level protection, a terminal protection and other multi-stage protection levels, and if the action time of the multi-stage leakage protector is consistent or close, the multi-stage leakage protector can synchronously or overridely act. And great loss is caused to real life and production.
Therefore, how to provide a tripping device with high safety and low cost and a control system with low cost, strong versatility and high sensitivity, which can avoid the malfunction of the product and ensure the normal leakage delay protection function of the product, is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is that the trip device in the prior art is easy to burn out; the existing leakage protector has low universality and insensitive response, and is easy to generate synchronous or override actions of the electric protector. Therefore, the utility model provides a contactless self-resuming device and applied this trip gear's residual current action (electric leakage) protection monostable delay control system.
In order to achieve the above object, the utility model provides a following technical scheme:
a contactless self-recovery device comprises a zero sequence transformer ZCT, an integrated circuit, a rectifying circuit, an actuating mechanism, a circuit breaker, a thyristor and an overload self-recovery protection circuit;
the integrated circuit comprises an operational amplifier and a latch;
the power supply of the circuit breaker penetrates through a zero sequence transformer ZCT, and the secondary side of the zero sequence transformer ZCT is connected with the reverse phase input end and the in-phase input end of the operational amplifier in a loop mode;
the alternating current input end of the rectifying circuit is connected with a power supply of the circuit breaker, and the direct current output end of the rectifying circuit forms a loop by serially connecting the overload self-recovery protection circuit, the actuating mechanism and the thyristor;
the overload self-recovery protection circuit comprises a self-recovery fuse which is connected with the actuating mechanism and the thyristor in series to form a loop to complete overload, short circuit and over-temperature protection;
the trigger end of the thyristor is connected with the signal output end of the latch;
and a voltage stabilizing circuit is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier, and the voltage stabilizing circuit comprises an action value resistor RL which is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier.
In one embodiment of the present invention, the voltage stabilizing circuit further includes filter capacitors C1 and C3 connected in parallel, and the filter capacitors C1 and C3 are connected in parallel between the inverting input terminal and the non-inverting input terminal of the operational amplifier and connected in parallel with the action value resistor RL.
In one embodiment of the present invention, the trigger end of the thyristor is further connected in series with a protection resistor R4, and the thyristor and the protection resistor R4 are connected in series at the delay output end of the voltage stabilizing circuit.
In one embodiment of the present invention, the contactless self-recovery device further comprises a voltage reducing and stabilizing circuit for providing the required stabilizing voltage for the integrated circuit, the voltage reducing and stabilizing circuit is connected in series between the dc output end of the rectifying circuit and the power supply of the integrated circuit, the voltage reducing and stabilizing circuit comprises a voltage reducing resistor R5, a capacitor C8 and a voltage stabilizing diode W1, and the capacitor C8 and the voltage stabilizing diode W1 are connected in parallel with the voltage reducing resistor after being connected in series.
In one embodiment of the present invention, the actuator may be a signal source such as an L-shaped release, a relay, a light emitting diode, or a buzzer.
In one embodiment of the present invention, the input end of the capacitor C3 is connected in series with a protection resistor R3, a protection resistor R3 and a capacitor C3 at two ends of the filter capacitor C1.
The utility model also provides a monostable delay control system, including monostable delay circuit and as above any one contactless self-resuming device, monostable delay circuit's input is connected at operational amplifier's output, and delay circuit's output is connected with the signal input part of latch, monostable delay circuit is including filling, discharge resistance R6, switch diode D10 and filling, discharge electric capacity C4, fills, discharge resistance R6 and switch diode D10 are parallelly connected again with fill, discharge electric capacity C4 is established ties and is given to fill, discharge electric capacity C4 fills, the discharge process accomplishes the delay output, D10 switches on at the time of the operational amplifier output for the high level, D10 cuts off when the low level; when the output end of the operational amplifier is at a high level, the R6 and the D10 form a parallel circuit, the switching tube D10 is conducted, and the delay capacitor C4 is rapidly charged through the D10; when the C4 is charged, the switch tube D10 is cut off, the input end of the latch is changed into high level, the high level output of the output end of the latch triggers the thyristor, the thyristor conduction executing mechanism disconnects the breaker to enable the zero sequence transformer ZCT signal to disappear, the output end of the operational amplifier is changed into low level D10 to be cut off, and R6 discharges the C4 quickly.
The beneficial effects of the utility model reside in that: the overload self-recovery protection control system has long service life, is safe and reliable, reduces the fire coefficient, is flexible and convenient to wire, prevents diodes (rectifier bridges), thyristors, an actuating mechanism, a circuit board (PCB) and a power supply from being burnt; the product scrapping caused by burning the product due to one-time misoperation in the prior art is effectively avoided, the quality of the tripping device is improved, the reliability is high, the service life is long, the energy is saved, the consumption is reduced, the environment is protected, the reliability is high, the anti-interference performance is high, the cost is reduced, and the universality is high; by arranging the monostable delay circuit, D10 is switched on when the output end of the operational amplifier is at a high level, and D10 is switched off when the output end of the operational amplifier is at a low level; when the output end of the operational amplifier is at high level, R6 and D10 form a parallel circuit, and C4 is quickly charged through D10; when the C4 is charged, the latch triggers the actuating mechanism to enable the zero sequence transformer ZCT signal to disappear, the output end of the operational amplifier becomes low level, at the moment, D10 is cut off, and the C4 is rapidly discharged; the control system adopts the integrated circuit IC with small volume, the time delay circuit and the non-time delay circuit are completed on the same integrated circuit, and the time delay can be completed without replacing an IC chip, so that the leakage protection circuit is safer, more reasonable, more accurate in time delay, more stable and reliable, wider in application scene, wide in time delay range, strong in anti-interference capability, low in manufacturing cost and strong in universality, and great convenience is brought to the inventory of manufacturers and the selectivity of users; control system adds monostable delay circuit on the basis of the operational amplification comparator output among the non-delay integrated circuit and latch input, makes the electronic module of taking the integrated function of time delay, and is small, job stabilization is reliable, and is with low costs, is suitable for more extensively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a contactless self-recovery device of the present invention.
Fig. 2 is a schematic circuit diagram of the contactless self-recovery device of the present invention.
Fig. 3 is a schematic diagram of the monostable delay control system.
Fig. 4 is a schematic circuit diagram of the monostable delay control system, showing that a self-restoring fuse can be connected in series at any position of the loop.
Fig. 5 is another embodiment of the monostable delay circuit of the monostable delay control system of the present invention.
Detailed Description
The core of the utility model lies in providing a with low costs, sensitivity is high, can avoid the product to cross the grade malfunction can guarantee the normal electric leakage time delay protect function's of product control system again in to solve the problem among the prior art simultaneously.
The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.
As shown in the attached figures 1-5, the utility model discloses a non-contact self-recovery device, which comprises a zero sequence transformer ZCT, an integrated circuit, a rectification circuit, an actuating mechanism, a circuit breaker, a thyristor (silicon controlled rectifier SCR) and an overload self-recovery protection circuit; the integrated circuit (IC1) comprises an operational amplifier and a latch; the power supply of the circuit breaker penetrates through a zero sequence transformer ZCT, and the secondary side of the zero sequence transformer ZCT is connected with the reverse phase input end and the in-phase input end of the operational amplifier in a loop mode; the alternating current input end of the rectifying circuit is connected with a power supply of the circuit breaker, and the direct current output end of the rectifying circuit forms a loop by serially connecting an overload self-recovery protection circuit, an actuating mechanism (tripping device) and a thyristor; the overload self-recovery protection circuit comprises a self-recovery fuse which is connected with an actuating mechanism (tripping device) and a thyristor in series to form a loop to complete overload, short circuit and over-temperature protection, as shown in figure 4, the self-recovery fuse is shown, FU1, FU2 and FU3 can be connected in series at any position of the loop; the trigger end of the thyristor (SCR) is connected with the signal output end of the latch; and a voltage stabilizing circuit is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier, and the voltage stabilizing circuit comprises an action value resistor RL which is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier.
The actuating mechanism (tripping device) can be a signal source such as an L-shaped tripping device, a relay, a light-emitting diode or a buzzer. In this embodiment, an L-shaped release is taken as an example for explanation.
In this embodiment, the overload self-recovery protection circuit is connected in series between the dc output end of the rectifier circuit and the actuator (trip device), as shown in fig. 4, when the overload self-recovery protection circuit is implemented, the overload self-recovery protection circuit can be connected in series at any point in the whole loop, not limited by the present invention. In this embodiment, the overload self-recovery protection circuit is connected in series between the rectifier circuit and the thyristor. The overload self-recovery protection circuit can be a single self-recovery fuse connected in series at any point in the whole loop, or can be more than two self-recovery fuses connected in series. After the arrangement, the power supply of the overload self-recovery protection control system can also be connected from the upper end or the lower end of the circuit breaker; the overload self-recovery protection control system may be reverse wired.
The following detailed description is made in conjunction with the prior art to describe the principles of the present invention:
in the prior art, an electric leakage protection switch circuit is usually designed to be a short-time (instantaneous) working system, when an electric leakage abnormal condition is detected by the electric leakage protection switch, a controller circuit cannot cut off a power supply instantaneously when working, the working current of an actuating mechanism (tripping device) is sharply increased, a coil rapidly generates heat to break down a short circuit, the current of a diode in a thyristor and a rectifying circuit is sharply increased to rapidly generate heat to break down, and circuits such as the thyristor, the rectifying circuit, the actuating mechanism (tripping device), a PCB (printed circuit board) and a connecting wire are easily burnt to cause fire and serious consequences;
an alternating current power supply converts alternating current into a direct current power supply through a rectifying circuit, and a self-recovery fuse (with overcurrent, overtemperature and overload automatic disconnection protection functions) circuit, an actuating mechanism (also called a tripping device), a simulation leakage test circuit (a simulation test switch), a thyristor and the like are connected in series between the positive pole and the negative pole of the direct current to form a complete closed loop; the power supply of the leakage controller is connected to the output end of the leakage protection switch according to the working principle, the controller is free of power supply when the switch contact is in the disconnection state, the controller is provided with the power supply when the switch contact is in the closing state, the leakage protection switch enters the working state, the self-recovery fuse is conducted, the zero sequence transformer does not detect the leakage signal and does not send a trigger thyristor command, the thyristor is in the cut-off state, the tripper does not act, and the switch is in the closing state.
When the zero sequence transformer detects that a leakage abnormal signal set value exists, a trigger thyristor command is sent, the cut-off state of the thyristor is changed into a conducting state, the tripper acts instantly to force the switch to open the switch instantly, the thyristor is cut off when the controller is powered off, and at the moment, the thyristor in the controller is still in an initialized cut-off state when the breaker closes the switch again. If the switch mechanical locking tripping device can not smoothly break the switch, the operating current of the actuating mechanism (tripping device) is rapidly increased, the coil is rapidly heated and broken down, the diode current in the thyristor and the rectifying circuit is rapidly increased, the thyristor, the rectifying circuit, the actuating mechanism (tripping device), the PCB circuit board, the connecting wire and other circuits are easily burnt to cause fire and serious consequences: if the thyristor is in a conducting state at the moment, the tripping device disconnects the switch, the output end of the leakage switch is provided with power supply current reverse input (power supply input, output line reverse connection, and load end is provided with power generation power supply backflow (motor)) and the like, the working current of the actuating mechanism (tripping device) is sharply increased, the coil is rapidly heated and punctured, and circuits such as the thyristor, the rectifying circuit, the actuating mechanism (tripping device), the PCB circuit board and the connecting wire are easily burnt to cause fire and serious consequences;
when the leakage switch is in a switching-on standby state, the simulation test switch is pressed down to simulate the leakage state (the simulation leakage is designed to check whether the leakage switch is intact, a user is advised to press a simulation test button every month to automatically check whether the leakage protection function is intact), when the zero-sequence mutual inductor detects that a leakage abnormal signal set value exists, a trigger thyristor command is sent, the cut-off state of the thyristor is changed into a conducting state, the tripper acts instantly, the switch is forced to be switched off instantly, the thyristor is cut off when the controller is powered off, and at the moment, the thyristor in the reclosing controller of the circuit breaker is still in. If the switch machinery is stuck, the thyristor is in a conducting state at the moment, the tripping device can not break the switch, the operating current of the actuating mechanism (tripping device) is sharply increased, the coil is rapidly heated and punctured, and the thyristor, the rectifying circuit, the actuating mechanism (tripping device), the PCB circuit board, the connecting wire and other circuits are easily burnt to cause fire and serious consequences: if the thyristor is in a conducting state at the moment when the analog test button is pressed, the tripping device disconnects the switch, the output end of the leakage switch is provided with power supply current reverse input (a power supply wire is reversely connected, a load end is provided with a power generation loop) and the like, the working current of an actuating mechanism (tripping device) is sharply increased, a coil is rapidly heated and punctured, and circuits such as the thyristor, a rectifying circuit, the actuating mechanism (tripping device), a PCB (printed circuit board) and a connecting wire are easily burnt to cause fire and serious consequences.
In the utility model, the overload self-recovery protection circuit is connected in series in the circuit, when the breaker is mechanically blocked, the tripping device works, but the circuit breaker is not opened, the thyristor in the leakage controller is triggered and conducted, the thyristor is in a conducting state under the abnormal conditions that the circuit breaker cannot be normally opened, the power input and output lines are reversely connected or the load end has the reverse-phase backflow (motor) of the power generation power supply, and the like, when the leakage controller fails to power off at the moment of thyristor conduction and the working current of the actuating mechanism (tripping device) increases sharply, at this moment, the self-recovery fuse in series in the circuit firstly heats and instantly changes from a low-resistance state to a high-resistance state, the loop current is cut off, the zero crossing of the thyristor is cut off along with the cut-off, therefore, the abnormal circuit is automatically closed, no current flows in the circuit, and the temperature of the self-recovery fuse is reduced to change from a high-resistance state to a low-resistance state so that the circuit automatically recovers conduction. The thyristor, the rectifying circuit, the actuating mechanism (tripping device), the PCB circuit board, the connecting wire and the like are effectively protected, and serious consequences such as burnout and the like which influence the use safety can not occur. The circuit breaker has the advantages of being free of maintenance, reliable in operation, stable in structure, safe and reliable, and capable of preventing reverse power-taking wiring, overload circuit PCB burning, tripping devices and circuit burning and the like.
The self-recovery fuse element enters a high-resistance protection state, the self-recovery fuse element is changed into a high-resistance state to limit the current to be suddenly reduced in a short time, other components and equipment in the circuit are protected from being damaged, and when the applied voltage disappears, the self-recovery fuse can automatically recover the low-resistance original state along with the reduction of the temperature.
The control module power supply of the self-recovery leakage protector is connected with a breaker power supply (both input and output ends of the breaker), when the control module power supply is taken as the output end of the breaker, the power supply is supplied to the control module when the breaker is switched on, a thyristor is in a cut-off state under the normal condition of a detected circuit in an initialization state, an executing mechanism (tripping device) does not work in a standby state, and the control module enters a working state;
when the control module power supply takes the input end of the circuit breaker, the circuit breaker is in the open state and the close state, the control module is in the working state, the thyristor is in the stop state under the normal condition of the detected circuit in the initialization state, the executing mechanism (tripping device) is not in the standby state, when the zero sequence transformer detects the abnormal condition of the leakage of the circuit, the zero sequence transformer compares the signal with the preset action value, when the signal reaches or exceeds the preset action value, the signal is processed and then sent to the trigger (gate) electrode of the thyristor, the thyristor is conducted, the executing mechanism (tripping device) electrified coil generates the magnetic field to move the iron core to instantly attract and drive the tripping device of the circuit breaker, the circuit breaker instantly forces the open state, when the control module power supply is connected with the output end of the circuit breaker, the control module is also powered off, The thyristor is cut off when the voltage is zero-crossing, and the controller restores the original state.
When the control module power supply is connected with the input end of the circuit breaker, the circuit breaker opening control module power supply supplies power as usual, the thyristor keeps conducting direct current, voltage continuously flows to an actuating mechanism (tripping device) (the tripper is a transient working system), generally, after a long time, the temperature of the electrified tripping coil rises sharply after the current lasts for a few seconds, the insulating layer material of the coil is damaged, the short-circuit resistance value of the coil is continuously reduced, the temperature of the current is increased sharply, the coil is ignited and burnt instantly, meanwhile, the rectifier diode, the thyristor, the circuit board and the circuit in the circuit are also heated and burnt rapidly along with the current passing through, at the moment, the self-recovery fuse in series connection in the circuit plays a very key role, and when the current on the actuating mechanism (the tripping device), the rectifier diode, the thyristor, the circuit board and the like is increased sharply or continuously increased, when the temperature also randomly increases to reach the preset characteristic, the current is instantly changed into a high-resistance state to cut off the load current of the loop, the conduction state of the thyristor is changed into a closing state, the actuating mechanism (tripping device) stops working when power is cut off, the high-resistance cut-off state of the self-recovery fuse is quickly and automatically recovered to the conduction state along with the temperature reduction, the circuit is recovered to the original initialization state, and the quick, safe and effective multiple protection effects are achieved. The thyristor switch is a direct current control circuit, and the thyristor characteristic direct current is not self-operated and can not be turned off after being turned on but is not zero.
The overload self-recovery protection control system has the advantages of long service life, safety, reliability, reduced fire coefficient, flexible and convenient wiring, diode (rectifier bridge) burning prevention, thyristor burning prevention, execution mechanism (tripping device) burning prevention, circuit (PCB) board burning prevention, power supply burning prevention, circuit burning prevention, product scrapping prevention due to one-time misoperation, product scrapping improvement, quality improvement, reliability improvement, service life prolonging, energy conservation, consumption reduction, environmental protection, reliability, strong anti-interference performance, low cost and strong universality.
Specifically, the voltage stabilizing circuit further comprises filter capacitors C1 and C3 which are connected in parallel, wherein the filter capacitors C1 and C3 are connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier and are connected in parallel with the action value resistor RL. The trigger end of the thyristor is also connected in series with a protective resistor R4, and the thyristor and the protective resistor R4 are connected in series at the delay output end of the voltage stabilizing circuit.
The contactless self-recovery device further comprises a voltage reduction and stabilization circuit which provides required stabilized voltage for the integrated circuit, the voltage reduction and stabilization circuit is connected between the direct current output end of the rectification circuit and a power supply of the integrated circuit in series, the voltage reduction and stabilization circuit comprises a voltage reduction resistor R5, a capacitor C8 and a voltage stabilization diode W1, and the capacitor C8 and the voltage stabilization diode W1 are connected in series and then connected with the voltage reduction resistor in parallel.
As shown in fig. 2-4, for the utility model provides a monostable delay control system, including monostable delay circuit and the contactless self-resuming device of foretell, the input of monostable delay circuit is connected at the output of operational amplifier, and the output of delay circuit is connected with the signal input part of latch, monostable delay circuit is including filling, discharge resistance R6, switching diode D10 and charging, discharge electric capacity C4, fills, discharge resistance R6 and switching diode D10 are parallelly connected again with filling, discharge electric capacity C4 is established ties and is filled, discharge electric capacity C4 fills, the discharge process accomplishes the delay output, D10 switches on when the operational amplifier output is the high level, D10 cuts off when the low level; when the output end of the operational amplifier is at a high level, the R6 and the D10 form a parallel circuit, the switching tube D10 is conducted, and the delay capacitor C4 is rapidly charged through the D10; when the C4 is charged, the switch tube D10 is cut off, the input end of the latch is changed into high level, the high level output of the output end of the latch triggers the thyristor, the thyristor conduction executing mechanism disconnects the breaker to enable the zero sequence transformer ZCT signal to disappear, the output end of the operational amplifier is changed into low level D10 to be cut off, and R6 discharges the C4 quickly.
Specifically, the input end of the capacitor C3 is connected in series with a protection resistor R3, and the protection resistor R3 is connected in series with the capacitor C3 and then is connected at two ends of the filter capacitor C1.
The working principle is as follows: when the zero sequence transformer detects a leakage signal, the zero sequence transformer generates the leakage signal, the signal generated by the difference of the leakage current is changed, the voltage signal is transmitted to the inverting input end and the non-inverting input end of the operational amplifier through the voltage stabilizing signal conversion circuit to be compared, when the operational amplification reaches a preset value, the output end of the operational amplifier outputs a high level, the high level conducts D1 through the monostable delay circuit, and the resistance value of the resistor of the RL and D1 which are parallel circuits is reduced, so that the C4 can be charged quickly; the latch delay output is completed by the C1 charging process because pin 1 of the D input of latch is low and the latch output is low before the C4 charging is not completed. The delay time of the delayer is directly related to the capacity of the charging and discharging capacitor C4. When no leakage current occurs at the load end of the control system, the sum of current vectors flowing through the zero sequence current transformer is zero, the secondary output voltage of the zero sequence current transformer is zero, namely, no voltage difference exists between pins 1 and pins 2 at the input end of the operational amplifier, the output end of the latch is in a low level state, and the leakage protection circuit breaker is in an original state; when the load end of the control system generates earth leakage, the zero sequence current transformer detects that leakage current directly flows to the ground from a live wire, the vector voltages of the live wire and zero line current in the zero sequence current transformer are not zero any more, induced voltage exists at the secondary side, voltage difference exists between the inverting input end and the non-inverting input end of the operational amplifier at the moment, when the voltage difference between the inverting input end and the non-inverting input end reaches a preset value of the operational amplifier, the output end of the differential operational amplifier outputs high level, the monostable delayer works, the monostable delayer outputs high level to the input end of the latch, the output end of the latch outputs high level to trigger the thyristor, the thyristor drives a tripping device, the leakage protection circuit breaker is separated from the gate to break the load, personal and property safety is protected, and the zero.
Specifically, the working principle can be further understood by the following formula:
in the following description, the resistance of D10 is abbreviated as R1。
Taking 4148 switching diode as an example: if is 150 mA; imax 150 Ma; uf ═ 1V; umax is 100V;
(1) when the output end of the operational amplifier is at high level, R6 and D10 form a parallel circuit according to the formula of the parallel circuit
At this time R1The value is extremely small, and the power supply quickly charges C4;
(2) when the output of the operational amplifier is low, D10 is cut off
Rapidly discharging C4.
That is to say: when the output end of the operational amplifier is at a high level, D10 is switched on, when the output end of the operational amplifier is at a low level, D10 is switched off, D10 and R6 form a parallel circuit, at this time, D10 is switched on, the resistance value after D10 is switched on is smaller than R6, C4 is rapidly charged through D10, the current on R6 is very small, when C4 is fully charged, a latch triggers a release to enable a zero sequence transformer signal to disappear, the output end of the operational amplifier becomes at a low level, D10 is switched off, at this time, R6 is a discharge resistor to discharge to rapid C685. The delay time and the discharge time are fast and slow according to the parameter values of R6 and C4. Therefore, the charging and discharging time can be controlled by controlling R6 and C4.
In the control system of the present invention, in practical application, the whole monostable delay circuit can be integrated into the Integrated Circuit (IC); the charging and discharging capacitor C4 may be provided separately on the integrated circuit for the convenience of adjusting the charging and discharging time in practical application.
The utility model discloses monostable time delay circuit design benefit, and is rational in infrastructure, components and parts are few, job stabilization, the time delay is reliable, can integrate inside integrated circuit IC, also can hang externally in current integrated circuit peripheral circuit, it frequently appears the mistake action phenomenon of stepping more to have solved earth-leakage protector, for example circuit protection one-level protection is 0.2S action value, the second grade protection is 0.15S action value, tertiary protection is 0.1S action value, terminal protection is multistage hierarchical protection such as 0.05S action value, the earth-leakage protector action time unanimity of having solved multistage action rank or close advancing, the earth-leakage protector synchronization or the mistake action of multistage level can not appear. The utility model discloses a 8 foot IC special chip of most common use increases one set of monostable delay circuit, has directly replaced 16 foot IC chip on function and performance, and is with low costs, components and parts inventory commonality strong, semi-finished ware and finished ware inventory are little, and sensitivity is high, and is fast, has both avoided the product malfunction and has guaranteed the normal electric leakage delay protect function of product again. The flexibility is strong, the commonality is strong, and job stabilization is reliable.
Further, as shown in fig. 3, the one-shot delay circuit further includes a resistor R2, and the resistor R2 is connected in series with D10 and then connected in parallel with R6. At this moment, the working principle of the monostable delay circuit is as follows: d10 is conducted when the output end of the operational amplifier is at high level, and D10 is cut off when the output end of the operational amplifier is at low level; when the output end of the operational amplifier is at a high level, the high level passes through, D10 and R2 form a series circuit, D10 is conducted to flow to R2 and R6 to form a parallel circuit, the total blocking is reduced, C4 can be charged quickly, when C4 is full, the latch triggers the release to enable a zero sequence transformer signal to disappear, the output end of the operational amplifier is changed to be at a low level, D10 is cut off, the parallel circuit of R2 and R6 is disconnected, and at the moment, R6 is a discharge resistor and discharges C4 quickly. Similarly, the delay time and the discharge time are determined by the values of C1, R2 and R6.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A contactless self-recovery device is characterized in that: the system comprises a zero sequence transformer ZCT, an integrated circuit, a rectifying circuit, an actuating mechanism, a circuit breaker, a thyristor and an overload self-recovery protection circuit;
the integrated circuit comprises an operational amplifier and a latch;
the power supply of the circuit breaker penetrates through a zero sequence transformer ZCT, and the secondary side of the zero sequence transformer ZCT is connected with the reverse phase input end and the in-phase input end of the operational amplifier in a loop mode;
the alternating current input end of the rectifying circuit is connected with a power supply of the circuit breaker, and the direct current output end of the rectifying circuit forms a loop by serially connecting the overload self-recovery protection circuit, the actuating mechanism and the thyristor;
the overload self-recovery protection circuit comprises a self-recovery fuse which is connected with the actuating mechanism and the thyristor in series to form a loop to complete overload, short circuit and over-temperature protection;
the trigger end of the thyristor is connected with the signal output end of the latch;
and a voltage stabilizing circuit is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier, and the voltage stabilizing circuit comprises an action value resistor RL which is connected in parallel between the inverting input end and the non-inverting input end of the operational amplifier.
2. A contactless self-healing device according to claim 1, characterized in that: the voltage stabilizing circuit further comprises filter capacitors C1 and C3 which are connected in parallel, wherein the filter capacitors C1 and C3 are connected between the inverting input end and the non-inverting input end of the operational amplifier in parallel and are connected with the action value resistor RL in parallel.
3. A contactless self-healing device according to claim 1, characterized in that: the trigger end of the thyristor is also connected in series with a protective resistor R4, and the thyristor and the protective resistor R4 are connected in series at the delay output end of the voltage stabilizing circuit.
4. A contactless self-healing device according to claim 1, characterized in that: the contactless self-recovery device further comprises a voltage reduction and stabilization circuit which provides required stabilized voltage for the integrated circuit, the voltage reduction and stabilization circuit is connected between the direct current output end of the rectification circuit and a power supply of the integrated circuit in series, the voltage reduction and stabilization circuit comprises a voltage reduction resistor R5, a capacitor C8 and a voltage stabilization diode W1, and the capacitor C8 and the voltage stabilization diode W1 are connected in series and then connected with the voltage reduction resistor in parallel.
5. A contactless self-healing device according to claim 1, characterized in that: the actuating mechanism can be an L-shaped release, a relay, a light emitting diode or a buzzer signal source.
6. A contactless self-healing device according to claim 2, characterized in that: the input end of the capacitor C3 is connected in series with a protection resistor R3, a protection resistor R3 and a capacitor C3, and is arranged at two ends of the filter capacitor C1.
7. A monostable delay control system characterised by: the contactless self-recovery device comprises a monostable delay circuit and the contactless self-recovery device according to any one of claims 1 to 6, wherein the input end of the monostable delay circuit is connected with the output end of the operational amplifier, the output end of the delay circuit is connected with the signal input end of the latch, the monostable delay circuit comprises a charging resistor R6, a switching diode D10 and a charging capacitor C4, the charging resistor R6 is connected with the switching diode D10 in parallel and then connected with a charging capacitor C4 in series to charge and discharge a capacitor C4, the delay output is completed in the discharging process, when the output end of the operational amplifier is at a high level, D10 is switched on, and when the output end of the operational amplifier is at a low level, D10 is switched off; when the output end of the operational amplifier is at a high level, the R6 and the D10 form a parallel circuit, the switching tube D10 is conducted, and the delay capacitor C4 is rapidly charged through the D10; when the C4 is charged, the switch tube D10 is cut off, the input end of the latch is changed into high level, the high level output of the output end of the latch triggers the thyristor, the thyristor conduction executing mechanism disconnects the breaker to enable the zero sequence transformer ZCT signal to disappear, the output end of the operational amplifier is changed into low level D10 to be cut off, and R6 discharges the C4 quickly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112825425A (en) * | 2019-11-20 | 2021-05-21 | 温州牛力智能科技有限公司 | Contactless self-recovery device and monostable delay control system |
| CN118867975A (en) * | 2024-09-27 | 2024-10-29 | 上海思格新能源技术有限公司 | Switch control circuit, inverter and photovoltaic power generation system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112825425A (en) * | 2019-11-20 | 2021-05-21 | 温州牛力智能科技有限公司 | Contactless self-recovery device and monostable delay control system |
| CN118867975A (en) * | 2024-09-27 | 2024-10-29 | 上海思格新能源技术有限公司 | Switch control circuit, inverter and photovoltaic power generation system |
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