CN217822624U - Intelligent controller of circuit breaker - Google Patents
Intelligent controller of circuit breaker Download PDFInfo
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- CN217822624U CN217822624U CN202122290147.7U CN202122290147U CN217822624U CN 217822624 U CN217822624 U CN 217822624U CN 202122290147 U CN202122290147 U CN 202122290147U CN 217822624 U CN217822624 U CN 217822624U
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Abstract
The utility model provides an intelligent control ware of circuit breaker, microcontroller MCU, MCR circuit, divide-shut brake position detection circuitry, magnetic flux drive circuit, current signal processing circuit, data memory, display key circuit and be used for the power supply circuit for intelligent control ware power supply, current signal processing circuit is connected with MCR circuit and microcontroller MCU respectively, and microcontroller MCU and MCR circuit are connected with the magnetic flux converter through magnetic flux drive circuit respectively, divide-shut brake position detection circuitry respectively with microcontroller MCU and MCR circuit connection, data memory and display key circuit are connected with microcontroller MCU respectively, microcontroller MCU monitors the remaining life-span of circuit breaker based on the input signal of divide-shut brake position detection circuitry and/or current signal processing circuit, if the remaining life-span of circuit breaker is less than preset dangerous value, the suggestion of reporting to the police reminds the user to change the circuit breaker before the circuit breaker became invalid.
Description
Technical Field
The utility model relates to a low-voltage apparatus field especially relates to an intelligent control ware of circuit breaker.
Background
The circuit breaker is an important component of the electrical appliance industry, when the circuit works normally, the circuit breaker can close and open the circuit, and when the circuit breaks down, the circuit breaker can automatically cut off the circuit, so that the safety of workers and the normal operation of equipment are prevented from being endangered due to the circuit faults. If the circuit breaker became invalid, then unable circuit breaker, if the circuit breaks down, can bring serious harm, but the user is unknown to the actual life condition of circuit breaker, can't take precautions against in advance, if too early change circuit breaker will cause the wasting of resources, if just change after unusual will cause the unnecessary power failure. Along with intelligent development, current circuit breaker has intelligent control ware usually, and current intelligent control ware can monitor the electric current of circuit breaker major loop, drives circuit breaker breaking circuit when the circuit breaks down, but current intelligent control ware can not indicate the user to change the circuit breaker. In addition, the existing intelligent controller also has the problems of single power supply mode of a power circuit, unstable power voltage, single circuit output for monitoring the current of the main loop of the circuit breaker and insufficient precision.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide an intelligent control ware of circuit breaker.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an intelligent controller of a circuit breaker comprises a microcontroller MCU, an MCR circuit, an opening and closing position detection circuit, a magnetic flux driving circuit, a current signal processing circuit, a data memory, a display key circuit and a power supply circuit for supplying power to the intelligent controller, wherein the current signal processing circuit is used for being connected with a current transformer, an output end of the current signal processing circuit is respectively connected with the MCR circuit and the microcontroller MCU, the microcontroller MCU and the MCR circuit are respectively connected with a magnetic flux converter through the magnetic flux driving circuit, the opening and closing position detection circuit is respectively connected with the microcontroller MCU and the MCR circuit, when the circuit breaker is closed, the MCR circuit triggers the circuit breaker to trip and open through the magnetic flux driving circuit when detecting that the switching-on current exceeds a preset value according to a current signal, the data memory and the display key circuit are respectively connected with the microcontroller MCU, the microcontroller MCU triggers the circuit to open and close through the magnetic flux converter, the microcontroller MCU monitors the residual service life of the circuit breaker based on the input signals of the opening and closing position detection circuit and/or the current signal processing circuit, and alarms and prompts if the residual life of the circuit is lower than a preset danger value.
Preferably, the power supply circuit comprises a current stabilizing circuit, a voltage stabilizing control circuit, a filter circuit and a DC/DC voltage reducing circuit, wherein the input ends of the current stabilizing circuit and the voltage stabilizing circuit are respectively used for being connected with the rapid saturation mutual inductor and the auxiliary power supply, the output ends of the current stabilizing circuit and the voltage stabilizing circuit are respectively connected with the filter circuit, a first direct current power supply is output through the filter circuit, the filter circuit is connected with the DC/DC voltage reducing circuit, the DC/DC voltage reducing circuit outputs a second direct current power supply, the voltage stabilizing control circuit is respectively connected with the current stabilizing circuit and the voltage stabilizing circuit and is used for controlling the output stability of the current stabilizing circuit and the voltage stabilizing circuit.
Preferably, the voltage stabilizing circuit comprises a rectifier bridge DB101, an electrolytic capacitor C101, a triode Q102, a triode Q103 and a zener diode DZ101; two input ends of the voltage stabilizing circuit are respectively connected with two alternating current input ends of the rectifier bridge DB101, a thermistor PT101 is connected in series between one input end of the voltage stabilizing circuit and the rectifier bridge DB101, and a piezoresistor RV101 is connected in parallel between the two alternating current input ends of the rectifier bridge DB 101;
the output positive end of the rectifier bridge DB101 is connected with the positive electrode of the electrolytic capacitor C101 after rectification, and is simultaneously connected with one end of a resistor R103, one end of a resistor R104-1 and the negative end of a voltage stabilizing diode DZ101, the output negative electrode of the rectifier bridge DB101 is connected with the negative electrode of the electrolytic capacitor C101, and is simultaneously connected with the emitter of a triode Q103 and the emitter of the triode Q101, and is simultaneously grounded, the other end of the resistor R104-1 is connected with an emitter of the triode Q103 after being connected with an R104-2 in series, the base electrode of the triode Q103 is connected with the positive end of the voltage stabilizing diode DZ101, and is connected with the collector electrode of the triode Q102 through a resistor R106, the collector electrode of the triode Q103 is connected with a filter circuit through a resistor R195 and a diode D101 after output, the base electrode of the triode Q102 is simultaneously connected with the collector electrode of the triode Q101 and the other end of the resistor R103 through a resistor R105, and the base electrode of the triode Q101 is connected with a voltage stabilizing control circuit.
Preferably, the current stabilizing circuit comprises a rectifier bridge DB102, a MOS transistor Q104 and a diode D102, two input ends of the current stabilizing circuit are respectively connected with two input alternating current ends of the rectifier bridge DB102, an output positive end of the rectifier bridge DB102 is connected with one end of a piezoresistor RV102, a D end of the MOS transistor Q104 and a positive end of the diode D102, an output negative end of the rectifier bridge DB102 is connected with the other end of the piezoresistor RV102 and an S end of the MOS transistor Q104, a negative end of the diode D102 is connected with a filter circuit, and a G end of the MOS transistor Q104 is connected with a voltage stabilizing control circuit.
Preferably, the voltage regulation control circuit comprises a comparator U111A, a resistor R189 and a voltage regulation diode DZ106 connected in series are connected between the output end and the ground end of the filter circuit, a reference level circuit is formed between the resistor R189 and the voltage regulation diode DZ106, the negative end of the comparator U111A is connected to the connection point between the resistor R189 and the voltage regulation diode DZ106 through a resistor R110, the resistors R107 and R108 connected in series constitute a voltage division sampling circuit, two ends of the voltage division sampling circuit are respectively connected to the output end and the ground end of the filter circuit, the positive end of the comparator U111A is connected to the connection point between the resistors R107 and R108 through a resistor R109, and the output end of the comparator U111A outputs control signals to the voltage regulation circuit and the current regulation circuit.
Preferably, the filter circuit comprises an inductor L102, a filter capacitor C103-1, a filter capacitor C103-2, a capacitor C104 and a voltage stabilizing diode DZ103, one end of the inductor L102 is connected with a current stabilizing circuit and a voltage stabilizing circuit, and the other end of the inductor L102 is used as the output end of the filter circuit to be connected with the DC/DC voltage reducing circuit and output a first direct current power supply; the filter capacitor C103-1, the filter capacitor C103-2, the capacitor C104 and the voltage stabilizing diode DZ103 are connected in parallel, one end of the filter capacitor C103-2 is connected with the other end of the inductor L102 after the filter capacitor C103-2 and the voltage stabilizing diode DZ103 are connected in parallel, and the other end of the filter capacitor C103-2 and the voltage stabilizing diode DZ after the filter capacitor C104 and the voltage stabilizing diode DZ are grounded after the filter capacitor C103-2 and the voltage stabilizing diode DZ are connected in parallel;
the DC/DC voltage reduction circuit comprises a main control chip U101, wherein a pin 1 of the main control chip U101 is an input end and is connected with a filter circuit, a pin 2 of the main control chip U101 is an output end and is connected with a fast recovery diode DZ102 and an inductor L101, the other end of the fast recovery diode DZ102 is grounded, the other end of the inductor L101 outputs a second direct current power supply, capacitors C106 and C107 are connected with a TVS diode TVS101 in parallel, one end of the parallel connection is connected with the other end of the inductor L101, the other end of the parallel connection is grounded, and a pin 3 of the main control chip U101 is a grounding pin and is grounded; the 4 th pin of the main control chip U101 is a feedback pin and is connected to the positive terminal of the capacitor C106, and the 5 th pin of the main control chip U101 is an enable pin and is grounded.
Preferably, the current signal processing circuit comprises two stages of amplifying circuits, namely a first stage amplifying circuit and a second stage amplifying circuit, wherein the input end of the first stage amplifying circuit is connected with the current transformer, and the output end of the first stage amplifying circuit is connected with the second stage amplifying circuit;
the first-stage amplifying circuit comprises an operational amplifier U106C, two input ends IA1 and IA2 of a current signal processing circuit are respectively connected with one ends of resistors R143 and R144, the other ends of R143 and R144 are respectively connected with the negative end and the positive end of the operational amplifier U106C, a capacitor C110 is connected between the two input ends IA1 and IA2 in parallel, the output end of the operational amplifier U106C is connected with one ends of resistors R145 and C118 which are connected in parallel, and the other end of the R145 and the C118 which are connected in parallel is connected to the negative end of the operational amplifier U106C in a feedback mode; the reference voltage is connected with one end of a resistor R147 and a resistor C122 which are connected in parallel, the other end of the resistor R147 and the resistor C122 which are connected in parallel is connected with the positive end of the operational amplifier U106C, and a capacitor C114 is connected between the negative end and the positive end of the operational amplifier U106C in parallel; the output end of the operational amplifier U106C is connected to the second-stage amplifying circuit, the output end of the operational amplifier U106C outputs a signal to a first output end ADC _ IA through a resistor R146, and the first output end ADC _ IA is respectively connected with the microcontroller MCU and the MCR circuit;
the second-stage amplification circuit comprises an operational amplifier U107C, the output end of the first-stage amplification circuit is connected with the negative end of the operational amplifier U107C through a resistor R148, a reference voltage is connected with the positive end of the operational amplifier U107C through a resistor R149, the output end of the operational amplifier U107C is connected to the negative end of the operational amplifier U107C through a resistor R150 in a feedback mode, the output end of the operational amplifier U107C outputs a signal to a second output end ADC _ IA 'through a resistor R151, and the second output end ADC _ IA' is connected with the microcontroller MCU.
Preferably, the residual service life of the circuit breaker comprises residual mechanical service life, when the circuit breaker performs closing, opening and tripping actions, the microcontroller MCU records the action times T1 of the circuit breaker according to the feedback of the opening and closing position detection circuit, and when the action times T1 of the circuit breaker reach an action threshold value, an alarm module gives an alarm.
Preferably, the remaining life of the circuit breaker includes the remaining life of a contact system, when the circuit breaker performs closing, opening and tripping operations, the microcontroller MCU calculates the wear amount CI of the contact system of the circuit breaker according to the main loop current i, and calculates the remaining contact life C0 of the contact system, and if i > In, the wear amount Cl = (i/In) ^2 dt of the contact system when the main loop current i is not zero; if i is less than In, the abrasion loss Cl = Ctotal/10000 of the contact system, C0= (Ctotal-CI)/Ctotal, wherein In is rated current, ctotal is the total service life of the contact system, dt is breaker breaking time, and if the residual contact service life C0 of the contact system is lower than a preset contact danger value, alarm reminding is carried out.
Preferably, the remaining Life of the circuit breaker comprises a remaining electric Life, when the circuit breaker is opened, under the condition that the main loop current i is not zero, the microcontroller MCU calculates the instantaneous electric Life Lint of the circuit breaker according to the main loop current i, and calculates the remaining electric Life L0, lint = (i) ^2 × dt, lo = (Life-Lint)/Life, where Life is the total electric Life and is a known value, dt is the breaking time of the circuit breaker, and if the remaining electric Life L0 of the circuit breaker is lower than a preset electric Life risk value, an alarm is given.
The utility model discloses an intelligent control ware of circuit breaker, including divide-shut brake position detection circuitry and current signal processing circuit, can monitor the remaining life-span of circuit breaker, if the remaining life-span of circuit breaker is less than preset dangerous value, then the suggestion of reporting to the police reminds the user to change the circuit breaker before the circuit breaker became invalid.
In addition, the input terminals of the current stabilizing circuit and the voltage stabilizing circuit of the power circuit of this embodiment are respectively used for being connected with the rapid saturation transformer and the auxiliary power supply, and can be connected through the rapid saturation transformer and/or the auxiliary power supply, and the output of the current stabilizing circuit and the output of the voltage stabilizing circuit are controlled through the voltage stabilizing control circuit, so that the stability of the output voltage is improved.
In addition, the current signal processing circuit comprises a two-stage amplifying circuit, so that the microcontroller MCU can select signals of the first output end ADC _ IA or the second output end ADC _ IA' as required to obtain more accurate main loop current I.
Drawings
Fig. 1 is a block diagram of an embodiment of an intelligent controller for a circuit breaker according to the present invention;
fig. 2 is a circuit diagram of an embodiment of the current signal processing circuit of the present invention;
fig. 3 is a circuit diagram of an embodiment of the power supply circuit of the present invention.
Detailed Description
The following further describes a specific embodiment of the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 3. The circuit breaker of the present invention is not limited to the description of the following embodiments.
As shown in fig. 1, the intelligent controller of the circuit breaker of this embodiment includes a microcontroller MCU, an MCR circuit (tripping on Current), an opening/closing position detection circuit, a magnetic flux driving circuit and a Current signal processing circuit, an input end of the Current signal processing circuit is used for being connected to a Current transformer, an output end of the Current signal processing circuit is respectively connected to the MCR circuit and the microcontroller MCU, the microcontroller MCU and the MCR circuit are respectively connected to a magnetic flux converter through the magnetic flux driving circuit, the opening/closing position detection circuit is respectively connected to the microcontroller MCU and the MCR circuit, the Current transformer collects a Current signal of a main circuit of the circuit breaker, the Current signal processing circuit processes the Current signal and provides the Current signal to the MCR circuit and the microcontroller MCU, when the circuit breaker is closed, the microcontroller MCU is not started yet, when the MCR circuit detects that the closing Current exceeds a predetermined value according to the Current signal, the magnetic flux driving circuit drives the magnetic flux converter to trigger opening/closing of the circuit breaker, so as to prevent the circuit breaker from being damaged by Current exceeding a limit closing capability, the circuit breaker is protected in a closing moment (within 100 ms), the magnetic flux converter is a circuit breaker that the circuit breaker receives an electrical energy into a mechanical trip command, and the circuit breaker is triggered to realize tripping operation. When the microcontroller MCU detects a current fault or receives a tripping command, the circuit breaker is triggered to trip and open a brake through the magnetic flux converter.
The intelligent controller also comprises a data memory and a display key circuit, wherein the data memory and the display key circuit are respectively connected with the microcontroller MCU, and the microcontroller MCU is used for calculating the current value of the current signal, protecting the circuit, and carrying out display control, parameter input and other operations through the display key circuit. The display key circuit comprises a display screen and keys, and can also comprise an alarm module such as an indicator light or a buzzer. Further, microcontroller MCU can also monitor the remaining life of circuit breaker based on the input signal of divide-shut brake position detection circuitry and/or current signal processing circuit, if the remaining life of circuit breaker is less than preset dangerous value, then reports to the police through showing key circuit and suggests, reminds the user to change the circuit breaker before the circuit breaker became invalid.
The intelligent controller comprises a power circuit used for supplying power to the intelligent controller, the power circuit can be used for being connected with the rapid saturation mutual inductor and the auxiliary power supply at the same time, the power is supplied through the rapid saturation mutual inductor or the external auxiliary power supply, the power is supplied to the intelligent controller after the power supply conversion of the rapid saturation mutual inductor or the auxiliary power supply is processed, and the power is supplied to each circuit module of the intelligent controller. Of course, the power circuit can be connected with the rapid saturation transformer or the auxiliary power supply only, and only one place is used for taking power, but the power circuit of the embodiment supports power supply from two places so as to provide stable power supply.
Preferably, as shown in fig. 3, the power circuit includes a current stabilizing circuit, a voltage stabilizing control circuit, a filter circuit and a DC/DC voltage reducing circuit, the input terminals of the current stabilizing circuit and the voltage stabilizing circuit are respectively used for being connected with the rapid saturation transformer and the auxiliary power supply, the output terminals of the current stabilizing circuit and the voltage stabilizing circuit are both connected with the filter circuit, a first DC power is output through the filter circuit, the filter circuit is connected with the DC/DC voltage reducing circuit, the DC/DC voltage reducing circuit outputs a second DC power, and the voltage stabilizing control circuit is respectively connected with the current stabilizing circuit and the voltage stabilizing circuit and is used for controlling the output stability of the current stabilizing circuit and the voltage stabilizing circuit so as to realize the voltage stabilizing function. The current stabilizing circuit and the voltage stabilizing circuit of the embodiment output a 24V first direct current power supply through the filter circuit, are used for supplying power to the magnetic flux driving circuit and driving the magnetic flux converter to act, and the DC/DC voltage reduction circuit reduces the voltage of the 24V power supply to a 5V second direct current power supply again and is used for supplying power to circuits such as a microcontroller MCU and an MCR circuit.
The input ends of the current voltage stabilizing circuit and the voltage stabilizing circuit of the power circuit are respectively used for being connected with the rapid saturation transformer and the auxiliary power supply, and can be connected through the rapid saturation transformer and/or the auxiliary power supply, and the output of the current voltage stabilizing circuit and the output of the voltage stabilizing circuit are controlled through the voltage stabilizing control circuit, so that the stability of the output voltage is improved.
The voltage stabilizing circuit comprises a rectifier bridge DB101, an electrolytic capacitor C101, a triode Q102, a triode Q103 and a voltage stabilizing diode DZ101; two output ends of the auxiliary power supply are respectively connected with two input ends of the voltage stabilizing circuit, two input ends of the voltage stabilizing circuit are respectively connected with two alternating current input ends of the rectifier bridge DB101, a thermistor PT101 is connected in series between one input end of the voltage stabilizing circuit and the rectifier bridge DB101, and a piezoresistor RV101 is connected in parallel between the two alternating current input ends of the rectifier bridge DB 101;
the output positive end of the rectified bridge DB101 is connected with the positive electrode of an electrolytic capacitor C101, and is simultaneously connected with one end of a resistor R103, one end of a resistor R104-1 and the negative end of a voltage stabilizing diode DZ101, the output negative electrode of the rectified bridge DB101 is connected with the negative electrode of the electrolytic capacitor C101, and is simultaneously connected with an emitter of a triode Q103 and an emitter of the triode Q101, and is simultaneously grounded, the other end of the resistor R104-1 is connected with an emitter of the triode Q103 after being connected with an R104-2 in series, the base electrode of the triode Q103 is connected with the positive end of the voltage stabilizing diode DZ101, and is connected with a collector electrode of a triode Q102 through a resistor R106, the collector electrode of the triode Q103 is connected with a filter circuit through a resistor R195 and a diode D101 after being output, and is used as an output end of a voltage stabilizing circuit to output a DC24V power supply, the base electrode of the triode Q102 is simultaneously connected with the collector electrode of the triode Q101 and the other end of the resistor R103 through a resistor R105, the base electrode of the voltage stabilizing circuit is connected with a voltage stabilizing control circuit, and the output voltage stabilizing circuit of the triode Q101.
The output energy of the rapid saturation transformer is a constant current source, the voltage stabilization processing is carried out on the constant current source through a current stabilizing circuit, the current stabilizing circuit comprises a rectifier bridge DB102, an MOS tube Q104 and a diode D102, two output ends of the rapid saturation transformer are connected with two input ends of the current stabilizing circuit, two input ends of the current stabilizing circuit are respectively connected with two input alternating current ends of the rectifier bridge DB102, an output positive end of the rectifier bridge DB102 is connected with one end of a piezoresistor RV102, a D end of the MOS tube Q104 and a positive end of the diode D102, an output negative end of the rectifier bridge DB102 is connected with the other end of the piezoresistor RV102 and an S end of the MOS tube Q104, a negative end of the diode D102 is connected with a filter circuit and serves as an output end of the current stabilizing circuit to output DC24V, and a G end of the MOS tube Q104 is connected with a voltage stabilization control circuit to realize the function of current stabilization.
Preferably, the filter circuit comprises an inductor L102, a filter capacitor C103-1, a filter capacitor C103-2, a capacitor C104 and a zener diode DZ103, one end of the inductor L102 is connected with the current stabilizing circuit and the voltage stabilizing circuit, and the other end of the inductor L102 is used as the output end of the filter circuit to be connected with the DC/DC voltage reducing circuit and output a first direct current power supply, so that the power supply output of DC24V is realized; the filter capacitor C103-1, the filter capacitor C103-2, the capacitor C104 and the voltage stabilizing diode DZ103 are connected in parallel, one end of the parallel connection is connected with the other end of the inductor L102, and the other end of the parallel connection is grounded.
The voltage stabilizing control circuit consists of a comparator U111A and a peripheral circuit, the voltage stabilizing control circuit comprises the comparator U111A, a resistor R189 and a voltage stabilizing diode DZ106 which are connected in series are connected between the output end and the ground end of a filter circuit, a 2.5V reference level circuit is formed between the resistor R189 and the voltage stabilizing diode DZ106, the negative end of the comparator U111A is connected to the connection point between the resistor R189 and the voltage stabilizing diode DZ106 through a resistor R110, the resistors R107 and R108 which are connected in series form a voltage dividing and sampling circuit, two ends of the voltage dividing and sampling circuit are respectively connected with the output end and the ground end of the filter circuit, the positive end of the comparator U111A is connected to the connection point between the resistors R107 and R108 through a resistor R109, when the voltage of the voltage dividing and sampling circuit is less than the reference 2.5V after voltage division, the output end of the comparator U111A outputs a low level, otherwise, the high level is output; the output end of the comparator U111A outputs a control signal which is used for being connected with a base electrode of a triode Q101 of the voltage stabilizing circuit and a G end of an MOS tube Q104 of the current stabilizing circuit, the control signal is grounded after passing through a resistor R101 and a resistor R102, and the base electrode of the triode Q101 is connected to a connection point between the resistor R101 and the resistor R102, so that the control signal drives the triode Q103 to carry out switching control after passing through a negation circuit formed by the resistors R101, R102, R103 and the triode Q101, and voltage stabilizing output of the voltage stabilizing circuit is controlled. Preferably, the device further comprises a capacitor C102, and two ends of the capacitor C102 are connected to two ends of the resistor R102.
The DC/DC voltage reduction circuit is composed of a main control chip U101 and a peripheral circuit thereof, the DC/DC voltage reduction circuit comprises the main control chip U101, a pin 1 of the main control chip U101 is an input end, is connected with a filter circuit and is connected with a DC24V power supply after voltage stabilization, a pin 2 of the main control chip U101 is an output end, is connected with a fast recovery diode DZ102 and an inductor L101, the other end of the fast recovery diode DZ102 is grounded, the other end of the inductor L101 outputs a second direct current power supply to realize 5V output, capacitors C106, C107 and a TVS diode TVS101 are connected in parallel, one end after parallel connection is connected with the other end of the inductor L101, the other end after parallel connection is grounded, a pin 3 of the main control chip U101 is a grounded pin, and is grounded; the 4 th pin of the main control chip U101 is a feedback pin and is connected to the positive terminal of the capacitor C106, and the 5 th pin of the main control chip U101 is an enable pin and is directly grounded and is always on. Preferably, the model of the main control chip U101 is LM2575. Of course, the DC/DC voltage reduction circuit may also adopt other buck conversion circuits (buck circuits).
Preferably, as shown in fig. 2, the current signal processing circuit of this embodiment includes two stages of amplifying circuits, which are a first stage amplifying circuit and a second stage amplifying circuit, respectively, an input end of the first stage amplifying circuit is connected to the current transformer, and an output end of the first stage amplifying circuit is connected to the second stage amplifying circuit, where the first stage is an integrating amplifying circuit, and the second stage is an inverting amplifying circuit.
The first-stage amplifying circuit comprises an operational amplifier U106C, the output end of a current transformer is connected with two input ends IA1 and IA2 of a current signal processing circuit, the two input ends IA1 and IA2 of the current signal processing circuit are respectively connected with one ends of resistors R143 and R144, the other ends of the resistors R143 and R144 are respectively connected with the negative end and the positive end of the operational amplifier U106C, a capacitor C110 is connected between the two input ends IA1 and IA2 of the current signal processing circuit in parallel, the output end of the operational amplifier U106C is connected with one ends of resistors R145 and C118 which are connected in parallel, and the other end of the R145 and the C118 which are connected in parallel is connected with each other in feedback mode to the negative end of the operational amplifier U106C to form an integral amplifying circuit; the reference voltage 2.5Vref is connected with one end of the resistors R147 and C122 which are connected in parallel, and the other end of the resistors R147 and C122 which are connected in parallel is connected with the positive end of the operational amplifier U106C, so that the lifting of the reference level is realized; the output end of the operational amplifier U106C is connected to the second-stage amplifying circuit, the output end of the operational amplifier U106C outputs a signal to the first output end ADC _ IA through the resistor R146, the first output end ADC _ IA is respectively connected with the microcontroller MCU and the MCR circuit, and the current signal after the first-stage amplification is transmitted to the microcontroller MCU and the MCR circuit. Preferably, the circuit further comprises a capacitor C114 and a capacitor C126, the capacitor C114 is connected in parallel between the negative terminal and the positive terminal of the operational amplifier U106C, one end of the capacitor C126 is connected to the first output terminal ADC _ IA, and the other end is grounded.
The second-stage amplification circuit comprises an operational amplifier U107C, the output end of the first-stage amplification circuit is connected with the negative end of the operational amplifier U107C through a resistor R148, the reference voltage 2.5Vref is connected with the positive end of the operational amplifier U107C through a resistor R149, the output end of the operational amplifier U107C is connected to the negative end of the operational amplifier U107C through feedback after passing through a resistor R150, inverse proportion amplification is achieved, the output end of the operational amplifier U107C outputs a signal to a second output end ADC _ IA 'through a resistor R151, the second output end ADC _ IA' is connected with the microcontroller MCU, and the current signal after second-stage amplification is transmitted to the microcontroller MCU. Preferably, the capacitor C130 is further included, and one end of the capacitor C130 is connected to the second output terminal ADC _ IA', and the other end is grounded.
The current signal processing circuit of this embodiment includes two-stage amplifier circuit for microcontroller MCU can select the signal of first output ADC _ IA or second output ADC _ IA' as required, can further amplify through second stage amplifier circuit to the undercurrent signal, obtains more accurate main loop current I, improves monitoring accuracy.
As shown in fig. 1, the utility model discloses an intelligent control ware of circuit breaker includes microcontroller MCU and the current signal processing circuit and the divide-shut brake position detection circuit who is connected with microcontroller MCU respectively, current signal processing circuit is connected with current transformer, a main loop current I for monitoring the circuit breaker, and feed back to microcontroller MCU, divide-shut brake position detection circuit is used for monitoring the action change of circuit breaker, when the circuit breaker breaks off (separating brake or tripping operation) and closed (combined floodgate) action, divide-shut brake position detection circuit feeds back microcontroller MCU with the divide-shut brake state feedback of circuit breaker.
The embodiment of the opening and closing position detection circuit comprises a micro switch which is arranged corresponding to an operating mechanism or a contact mechanism of a circuit breaker, wherein the operating mechanism or the contact mechanism moves to an opening position to trigger the corresponding micro switch when the circuit breaker is closed, or the operating mechanism or the contact mechanism moves to an opening position to trigger the corresponding micro switch when the circuit breaker is opened, and an opening and closing signal of the circuit breaker is transmitted to a microcontroller MCU through the micro switch. Another embodiment of the switching-on/off position detection circuit is to detect the voltage of a main circuit of the circuit breaker, when switching on, the main circuit of the circuit breaker is switched on to output a high level, and after switching off, the main circuit of the circuit breaker is switched off to output a low level.
Preferably, microcontroller MCU can be according to the remaining life of main loop current I and the action change monitoring circuit breaker of circuit breaker, if the remaining life of circuit breaker is less than preset dangerous value then the suggestion of reporting to the police, and intelligent control ware includes alarm module, can report to the police through alarm module, reminds the user to change the circuit breaker before the circuit breaker became invalid. Alarm module can be for showing keying circuit's display screen, through the display screen suggestion user, still can be for pilot lamp or bee calling organ, perhaps be communication module, and microcontroller MCU sends alarm information through communication module and reminds the user. The microcontroller MCU can be used to monitor the remaining mechanical life of the circuit breaker and/or to calculate the remaining life of the contact system of the circuit breaker and/or to calculate the remaining electrical life of the circuit breaker.
Preferably, the residual life of the circuit breaker comprises residual mechanical life, when the circuit breaker performs closing, opening and tripping actions, the microcontroller MCU records the action times T1 of the circuit breaker according to the feedback of the opening and closing position detection circuit, and the circuit breaker alarms and reminds when the action times T1 of the circuit breaker reach an action threshold value. As another alarm mode for remaining mechanical life, the remaining mechanical life T0 of the circuit breaker, T0= (T2-T1)/T2, may also be calculated according to the number of times T1 that the circuit breaker is operated and the total mechanical life T2 of the circuit breaker, where the total mechanical operation life T2 of the circuit breaker may be obtained through a mechanical operation test before the circuit breaker leaves a factory, and when the remaining mechanical life of the circuit breaker is lower than a preset mechanical risk value, an alarm is given through an alarm module to remind a user to replace the circuit breaker before the circuit breaker fails. Typically, the preset dangerous value of the remaining mechanical life is 1/10 of the total mechanical life of the circuit breaker. The residual mechanical life of the circuit breaker and the preset danger value of the residual mechanical life can be adjusted according to different conditions.
Preferably, the residual life of the circuit breaker comprises the residual life of a contact system, when the circuit breaker performs switching-on, switching-off and tripping actions, the microcontroller MCU calculates the abrasion loss CI of the contact system of the circuit breaker according to the main loop current i, calculates the residual contact life C0 of the contact system according to the abrasion loss CI of the contact system and the total life Ctotal of the contact system, and gives an alarm through the alarm module if the residual contact life C0 of the contact system is lower than a preset contact danger value, so as to remind a user to replace the circuit breaker. Typically, the preset hazard value for the remaining contact life C0 is 1/10 of the total life Ctotal of the contact system. The total service life Ctotal of the contact system is a known value, and the preset danger value of the residual contact service life C0 can be adjusted according to different conditions. The total service life Ctotal of the contact system is a known value, can be obtained through tests, and is stored In a data memory of the intelligent controller In advance, one way of obtaining the Ctotal value is that Ctotal = (Icu/In) ^2 × q × dt, wherein In is rated current, q is the number of times that the breaker can bear limit disjunction, icu is the current value that the breaker can bear limit disjunction, and dt is the disjunction time of the breaker, and is a constant.
An embodiment for calculating the service life of a contact system is that, under the condition that the current i of a main loop is not zero, a microcontroller MCU calculates the current CI of the contact system according to the relationship between the current i of the main loop of a circuit breaker at the moment of opening the circuit breaker and a rated current In, and if i is greater than In, the CI of the contact system is = (i/In) ^2 × dt; if i is less than In, the abrasion loss Cl = Ctotal/10000 of the contact system, wherein In is rated current, ctotal is the total service life of the contact system and is a known value, dt is breaker breaking time and is a constant; calculating the equivalent of the contact life, namely the residual contact life C0 of the contact system, wherein C0= (Ctotal-CI)/Ctotal, comparing the residual contact life C0 of the contact system with a preset contact danger value, and if the residual contact life C0 of the contact system is lower than the preset contact danger value, alarming through an alarm module to remind a user of replacing the circuit breaker.
The residual Life of circuit breaker includes the residual electric Life, when the circuit breaker separating brake, under the condition that main loop current i is not zero, microcontroller MCU calculates the instantaneous electric Life Lint of circuit breaker according to main loop current i to calculate the residual electric Life L0 of circuit breaker according to the instantaneous electric Life Lint of circuit breaker and the electric Life total amount Life of circuit breaker, if the residual electric Life L0 of circuit breaker is less than preset electric Life dangerous value, report to the police through alarm module, remind the user to change the circuit breaker. Generally, the preset electric Life danger value of the residual electric Life L0 is 1/10 of the total electric Life Life of the circuit breaker. Wherein, the electric Life total amount Life of circuit breaker is known value, can obtain according to the experiment, and remaining electric Life L0's the dangerous value of default electric Life can be adjusted according to different situation. One way to obtain Life is that Life = In a dt, where In is the rated current value of the circuit breaker, a is a coefficient preset value, which can be adjusted according to the Life capability of the circuit breaker, 3000 In this embodiment, dt is the breaking time of the circuit breaker, and is a constant. An embodiment of calculating the instantaneous electric Life Lint is that Lint = (i) ^2 × dt, the residual electric Life L0 is calculated based on Lint and Life, LO = (Life-Lint)/Life, if the residual electric Life L0 of the circuit breaker is lower than a preset electric Life dangerous value, an alarm module alarms to remind a user to replace the circuit breaker.
The utility model discloses a circuit breaker, its intelligent control ware can calculate the life-span of circuit breaker, if the life-span of circuit breaker is less than preset dangerous value, then report to the police through alarm module, remind the user to change the circuit breaker before the circuit breaker became invalid, not only can effectively take precautions against the potential safety hazard that brings after the circuit breaker became invalid, can avoid the economic loss that too early change circuit breaker brought moreover.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (8)
1. The utility model provides an intelligent control ware of circuit breaker, microcontroller MCU, MCR circuit, divide-shut brake position detection circuitry, magnetic flux drive circuit, current signal processing circuit, data memory, demonstration keying circuit and be used for the power supply circuit for the intelligent control ware power supply which characterized in that: the current signal processing circuit is used for being connected with a current transformer, the output end of the current signal processing circuit is respectively connected with the MCR circuit and the microcontroller MCU, the microcontroller MCU and the MCR circuit are respectively connected with the magnetic flux converter through a magnetic flux driving circuit, the opening and closing position detection circuit is respectively connected with the microcontroller MCU and the MCR circuit, when the circuit breaker is closed, the MCR circuit detects that the switching-on current exceeds a preset value according to a current signal, the magnetic flux driving circuit drives the magnetic flux converter to trigger the circuit breaker to trip and open the gate, the data storage and the display key circuit are respectively connected with the microcontroller MCU, the microcontroller MCU triggers the circuit breaker to trip and open the gate through the magnetic flux converter, the microcontroller MCU monitors the residual life of the circuit breaker based on input signals of the opening and closing position detection circuit and/or the current signal processing circuit, and gives an alarm if the residual life of the circuit breaker is lower than a preset danger value.
2. The intelligent controller of circuit breaker according to claim 1, characterized in that: the power supply circuit comprises a current voltage stabilizing circuit, a voltage stabilizing control circuit, a filter circuit and a DC/DC voltage reducing circuit, wherein the input ends of the current voltage stabilizing circuit and the voltage stabilizing circuit are respectively used for being connected with a rapid saturation mutual inductor and an auxiliary power supply, the output ends of the current voltage stabilizing circuit and the voltage stabilizing circuit are respectively connected with the filter circuit, a first direct current power supply is output through the filter circuit, the filter circuit is connected with the DC/DC voltage reducing circuit, the DC/DC voltage reducing circuit outputs a second direct current power supply, and the voltage stabilizing control circuit is respectively connected with the current voltage stabilizing circuit and the voltage stabilizing circuit and is used for controlling the output stability of the current voltage stabilizing circuit and the voltage stabilizing circuit.
3. The intelligent controller of circuit breaker according to claim 2, characterized in that: the voltage stabilizing circuit comprises a rectifier bridge DB101, an electrolytic capacitor C101, a triode Q102, a triode Q103 and a voltage stabilizing diode DZ101; two input ends of the voltage stabilizing circuit are respectively connected with two alternating current input ends of the rectifier bridge DB101, a thermistor PT101 is connected in series between one input end of the voltage stabilizing circuit and the rectifier bridge DB101, and a piezoresistor RV101 is connected in parallel between the two alternating current input ends of the rectifier bridge DB 101;
the output positive end of the rectifier bridge DB101 is connected with the positive electrode of the electrolytic capacitor C101 after rectification, and is simultaneously connected with one end of a resistor R103, one end of a resistor R104-1 and the negative end of a voltage stabilizing diode DZ101, the output negative electrode of the rectifier bridge DB101 is connected with the negative electrode of the electrolytic capacitor C101, and is simultaneously connected with the emitter of a triode Q103 and the emitter of the triode Q101, and is simultaneously grounded, the other end of the resistor R104-1 is connected with an emitter of the triode Q103 after being connected with an R104-2 in series, the base electrode of the triode Q103 is connected with the positive end of the voltage stabilizing diode DZ101, and is connected with the collector electrode of the triode Q102 through a resistor R106, the collector electrode of the triode Q103 is connected with a filter circuit through a resistor R195 and a diode D101 after output, the base electrode of the triode Q102 is simultaneously connected with the collector electrode of the triode Q101 and the other end of the resistor R103 through a resistor R105, and the base electrode of the triode Q101 is connected with a voltage stabilizing control circuit.
4. The intelligent controller of circuit breaker according to claim 2, characterized in that: the current stabilizing circuit comprises a rectifier bridge DB102, an MOS tube Q104 and a diode D102, two input ends of the current stabilizing circuit are respectively connected with two input alternating current ends of the rectifier bridge DB102, the output positive end of the rectifier bridge DB102 is connected with one end of a piezoresistor RV102, the D end of the MOS tube Q104 is connected with the positive end of the diode D102, the output negative end of the rectifier bridge DB102 is connected with the other end of the piezoresistor RV102 and the S end of the MOS tube Q104, the negative end of the diode D102 is connected with a filter circuit, and the G end of the MOS tube Q104 is connected with a voltage stabilizing control circuit.
5. The intelligent controller of circuit breaker according to claim 2, characterized in that: the voltage stabilizing control circuit comprises a comparator U111A, a resistor R189 and a voltage stabilizing diode DZ106 which are connected in series are connected between the output end and the grounding end of a filter circuit, a reference level circuit is formed between the resistor R189 and the voltage stabilizing diode DZ106, the negative end of the comparator U111A is connected to the connection point between the resistor R189 and the voltage stabilizing diode DZ106 through a resistor R110, a voltage dividing and sampling circuit is formed by resistors R107 and R108 which are connected in series, two ends of the voltage dividing and sampling circuit are respectively connected with the output end and the grounding end of the filter circuit, the positive end of the comparator U111A is connected to the connection point between the resistors R107 and R108 through a resistor R109, and the output end of the comparator U111A outputs control signals to a voltage stabilizing circuit and a current stabilizing circuit.
6. The intelligent controller of circuit breaker according to claim 2, characterized in that: the filter circuit comprises an inductor L102, a filter capacitor C103-1, a filter capacitor C103-2, a capacitor C104 and a voltage stabilizing diode DZ103, wherein one end of the inductor L102 is connected with a current voltage stabilizing circuit and a voltage stabilizing circuit, and the other end of the inductor L102 is used as the output end of the filter circuit to be connected with a DC/DC voltage reducing circuit and output a first direct current power supply; the filter capacitor C103-1, the filter capacitor C103-2, the capacitor C104 and the voltage stabilizing diode DZ103 are connected in parallel, one end of the filter capacitor C103-2 after parallel connection is connected with the other end of the inductor L102, and the other end of the filter capacitor C104 after parallel connection is grounded;
the DC/DC voltage reduction circuit comprises a main control chip U101, wherein a pin 1 of the main control chip U101 is an input end and is connected with a filter circuit, a pin 2 of the main control chip U101 is an output end and is connected with a fast recovery diode DZ102 and an inductor L101, the other end of the fast recovery diode DZ102 is grounded, the other end of the inductor L101 outputs a second direct current power supply, capacitors C106 and C107 are connected with a TVS diode TVS101 in parallel, one end of the parallel connection is connected with the other end of the inductor L101, the other end of the parallel connection is grounded, and a pin 3 of the main control chip U101 is a grounding pin and is grounded; the 4 th pin of the main control chip U101 is a feedback pin and is connected to the positive terminal of the capacitor C106, and the 5 th pin of the main control chip U101 is an enable pin and is grounded.
7. The intelligent controller of circuit breaker according to claim 1, characterized in that: the current signal processing circuit comprises two stages of amplifying circuits, namely a first stage amplifying circuit and a second stage amplifying circuit, wherein the input end of the first stage amplifying circuit is connected with the current transformer, and the output end of the first stage amplifying circuit is connected with the second stage amplifying circuit;
the first-stage amplifying circuit comprises an operational amplifier U106C, two input ends IA1 and IA2 of a current signal processing circuit are respectively connected with one ends of resistors R143 and R144, the other ends of R143 and R144 are respectively connected with the negative end and the positive end of the operational amplifier U106C, a capacitor C110 is connected between the two input ends IA1 and IA2 in parallel, the output end of the operational amplifier U106C is connected with one ends of resistors R145 and C118 which are connected in parallel, and the other end of the R145 and the C118 which are connected in parallel is connected to the negative end of the operational amplifier U106C in a feedback mode; the reference voltage is connected with one end of the resistors R147 and C122 which are connected in parallel, the other end of the resistors R147 and C122 which are connected in parallel is connected with the positive end of the operational amplifier U106C, and the capacitor C114 is connected between the negative end and the positive end of the operational amplifier U106C in parallel; the output end of the operational amplifier U106C is connected to the second-stage amplifying circuit, the output end of the operational amplifier U106C outputs a signal to a first output end ADC _ IA through a resistor R146, and the first output end ADC _ IA is respectively connected with the microcontroller MCU and the MCR circuit;
the second-stage amplifying circuit comprises an operational amplifier U107C, the output end of the first-stage amplifying circuit is connected with the negative end of the operational amplifier U107C through a resistor R148, a reference voltage is connected with the positive end of the operational amplifier U107C through a resistor R149, the output end of the operational amplifier U107C is connected to the negative end of the operational amplifier U107C through a resistor R150 in a feedback mode, the output end of the operational amplifier U107C outputs a signal to a second output end ADC _ IA 'through a resistor R151, and the second output end ADC _ IA' is connected with the microcontroller MCU.
8. The intelligent controller of circuit breaker according to claim 1, characterized in that: the residual service life of the circuit breaker comprises the residual mechanical service life, when the circuit breaker performs closing, opening and tripping actions, the Micro Controller Unit (MCU) records the action times T1 of the circuit breaker according to the feedback of the opening and closing position detection circuit, and alarms and reminds when the action times T1 of the circuit breaker reach an action threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122290147.7U CN217822624U (en) | 2021-09-22 | 2021-09-22 | Intelligent controller of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122290147.7U CN217822624U (en) | 2021-09-22 | 2021-09-22 | Intelligent controller of circuit breaker |
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| CN217822624U true CN217822624U (en) | 2022-11-15 |
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| CN202122290147.7U Active CN217822624U (en) | 2021-09-22 | 2021-09-22 | Intelligent controller of circuit breaker |
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