CN102097778B - Energy-saving undervoltage/overvoltage protective device - Google Patents
Energy-saving undervoltage/overvoltage protective device Download PDFInfo
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- CN102097778B CN102097778B CN201110036010.7A CN201110036010A CN102097778B CN 102097778 B CN102097778 B CN 102097778B CN 201110036010 A CN201110036010 A CN 201110036010A CN 102097778 B CN102097778 B CN 102097778B
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Abstract
The invention discloses an energy-saving undervoltage/overvoltage protective device, which comprises a rectification and voltage regulation circuit, wherein the rectification and voltage regulation circuit provides stable and reliable DC working power for a control circuit part and an actuator driving circuit, and provides energy required by a circuit breaker actuator; the control circuit part detects a voltage output by the rectification and voltage regulation circuit, outputs a control signal of forbidding closing to the actuator driving circuit when the voltage is less than or equal to a preset undervoltage threshold or when the voltage is more than or equal to an overvoltage threshold, and outputs the control signal of permitting the closing to the actuator driving circuit when the voltage is more than or equal to a preset closing action permission threshold and less than or equal to the overvoltage threshold; and the actuator driving circuit drives the mechanical part of a circuit breaker body to perform a closing forbidding, closing permission, energy-saving closing maintenance or tripping operation according to the control signal output by the control circuit part. Current consumption is lower than 50 percent of the current consumption of the conventional product.
Description
Technical field
The present invention relates to the under-voltage and over-pressure safety device of a kind of Novel energy-saving, this device is applicable to being applied in the time that supply power voltage exceeds normal allowed band the current supply circuit of electrical equipment and equipment is cut-off in the protective device of control.When supply power voltage lower than or while exceeding setting threshold scope, this protective device produces control signal, for example circuit breaker tripping tripping operation of driving switch electrical equipment is cut off the electricity supply, and makes power device or appliance cut-off, prevents or avoid the generation of economic loss and disaster.
Background technology
Along with the development of modern industrial or agricultural automation equipment and consumer appliances, low pressure power device or electrical equipment value volume and range of product are also more and more, when electric voltage exception appears in electric power system, during as under-voltage or overvoltage fault, may cause afunction or the permanent damages of power device or electrical equipment, cause economic loss, even cause disaster.
The problem that kinds of schemes solves under-voltage and overvoltage protection is proposed in prior art; the Chinese utility model patent that a kind of scheme is CN2924779Y as publication number; this scheme integrates under-voltage protecting circuit and leakage protection circuit; when in main circuit power supply system voltage overrun; logical circuit produces high-level control signal; make the actuating of relay, thereby disconnect the power supply of power consumption equipment.Another kind of scheme is as US Patent No. 2009237187A1(CN101512704A), this scheme is connected on the actuator of overvoltage signal controlling in under-voltage protection loop, to realize overvoltage and under-voltage protection function, structure relative complex.The Chinese invention patent application that another scheme is CN101237137A as publication number, in the time that supply power voltage exceeds normal range (NR), makes corresponding relay closes, thereby startup overcurrent protector is realized the object of cutoff circuit.This scheme must coordinate overcurrent protector could realize under-voltage and over-voltage protecting function.
These are existing under-voltage common only in the time there is under-voltage and overvoltage fault with overvoltage protection; produce triggering signal drive actuator; make the switch can be closed; conventionally need to provide and continue larger current signal and keep triggering signal; easily cause that noise is high, power consumption is large, the large problem of generating heat, and structure relative complex.
Summary of the invention
The object of this invention is to provide a kind of the have energy-saving undervoltage and the over-pressure safety device that improve function, at supply power voltage during in normal allowed band, this protective device adopts unique low current maintenance technology to maintain and allow the normal closure state of connecting of power supply with few energy, and can cut off the electricity supply in electric power system under-voltage or overvoltage (lower than the minimum Set scale value A% of rated voltage or higher than the maximum Set scale value C% of rated voltage) time, not only noise is low, energy-saving and environment friendly, the equipment noise that has overcome prior art is large, power consumption is large, the large shortcoming of generating heat, and the disaster of reliably having avoided power consumption equipment to damage and may bring.
To achieve these goals, the present invention has adopted following technical scheme.
Energy-saving undervoltage of the present invention and over-pressure safety device comprise:
Regulator rectifier circuit 2, for confessing that the AC power 1 of electrical network becomes direct current in the future, provides reliable and stable DC working power and institute's energy requirement to control circuit part 3 and actuator driving circuit 4.Control circuit part 3 detects the voltage of exporting from regulator rectifier circuit 2, in the time that voltage is equal to or less than predefined low-voltage threshold value A %, or in the time that voltage equals or moves threshold value C% higher than overvoltage, described control circuit part 3 is forbidden closed control signal to actuator driving circuit 4 outputs, in the time that voltage equals or moves threshold value C% higher than predefined permission closed action threshold value B% and lower than overvoltage, described control circuit part 3 allows closed control signal to actuator driving circuit 4 outputs.Actuator driving circuit 4 is connected with breaker body actuator, the control signal of exporting according to described control circuit part 3, actuator driving circuit 4 drives the execution of breaker body mechanical part to forbid closure, allow closure, maintain energy-conservation closure or trip operation.
According to one embodiment of the present invention, described control loop part 3 is by voltage detecting circuit 5, high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, overvoltage detection circuit 8 and logic control circuit 9 form, the voltage detecting circuit 5 being connected with power supply is respectively to high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, the input of overvoltage detection circuit 8 provides voltage signal, described high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, the output of overvoltage detection circuit 8 is respectively to logic control circuit 9 output signals, wherein the output of negative feedback closed loop pulse-width modulation circuit 7 and logic control circuit 9 provides control signal to actuator driving circuit 4 respectively.
According to another embodiment of the invention, described control loop part 3 is by voltage detecting circuit 5, feedback signal filtering and amplifying circuit 20, ADC module 21 and microprocessor 22 form, the voltage detecting circuit 5 being connected with power supply is connected with the output of feedback signal filtering and amplifying circuit 20 and with the input of ADC module 21, and, another output of feedback signal filtering and amplifying circuit 20 provides output signal to actuator driving circuit 4, the output of ADC module 21 connects microprocessor 22, the output of microprocessor 22 provides control signal to actuator driving circuit 4.ADC module 21 also can be combined with microprocessor 22, i.e. the microprocessor of built-in ADC module.
Described actuator driving circuit 4 comprises power device T2, sustained diode 1 and the trip coil L1 being connected in parallel with sustained diode 1, the grid of power switch pipe T2 receives the signal from logic control circuit 9 outputs 20, its drain electrode is connected with the positive pole of sustained diode 1, source electrode is connected with the inverting input of the operational amplifier A 2 of negative feedback closed loop pulse-width modulation circuit 7, and the negative pole of sustained diode 1 is connected with power supply VCC2.
Described high voltage quick-make circuit 6 comprises operational amplifier A 1, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and capacitor C 1 and triode T1, wherein, the voltage signal of the normal phase input end of operational amplifier A 1 is the voltage detection signal 15 that voltage detecting circuit 5 is exported, the voltage signal V1 of inverting input is the threshold signal B% setting in advance, the output of operational amplifier A 1 is through the first resistance R 1, capacitor C 1, the second resistance R 2 is connected with the base stage of triode T1, the collector electrode of triode T1 connects power supply VCC1 through the 3rd resistance R 3, an input 16 of the emitter andlogic control circuit 9 of triode T1 is connected, for it provides quick-make switch control signal, and the emitter of triode T1 is through the 4th resistance R 4 ground connection.
Described negative feedback closed loop pulse-width modulation circuit 7 comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and comparator A2, wherein, the voltage detection signal 15 that the normal phase input end of comparator A2 is exported through the 5th resistance R 5 receiver voltage testing circuits 5, the output of the 5th resistance R 5 is through the 6th resistance R 6 ground connection, the inverting input of comparator A2 is connected with the source electrode of the power switch pipe T2 of actuator driving circuit 4, and through the 7th resistance R 7 ground connection, the output of comparator A2 provides control signal to the input 17 of logic control circuit 9.
The inverter N1 that described overvoltage detection circuit 8 comprises comparator A3 and is connected in series with its output; wherein A3 is operational amplifier; N1 also can be realized by operational amplifier; the voltage signal of the normal phase input end of operational amplifier A 3 is the voltage detection signal 15 that voltage detecting circuit 5 is exported; the symbol V2 of the input voltage of its inverting input has represented the overvoltage protection action threshold value C% setting in advance, and its output provides control signal to the input 18 of logic control circuit 9.
Described logic control circuit 9 comprises over-voltage comparator, under voltage comparator and logical circuit, logic control circuit 9 has 3 signal input parts 16, 17, 18, signal input part 16 receives the output signal of high voltage quick-make circuit 6, signal input part 17 receives the output signal of negative feedback closed loop pulse-width modulation circuit 7, signal input part 18 receives the output signal of overvoltage detection circuit 8, logic control circuit 9 has signal output part 19, described logical circuit is according to 3 input signals 16, 17, 18 logic operation result, forbid closure or tripping operation control signal by over-voltage comparator or under voltage comparator to actuator driving circuit 4 outputs.Described logic control circuit 9 meets following logic control relation: in the time that the input signal 18 providing from overvoltage detection circuit 8 is low level, the output signal 19 of logic control circuit 9 is also low level, when the input signal 18 from overvoltage detection circuit 8, while being high level from the input signal 16 of high voltage quick-make circuit 6 or from the signal 17 of negative feedback closed loop pulse-width modulation circuit 7, the output signal 19 of logic control circuit 9 is high level.
Under-voltage and over-pressure safety device provided by the invention has following feature: the minimum Set scale value A% lower than rated voltage is made as to low-voltage threshold value, overvoltage action threshold value will be made as higher than the maximum Set scale value C% of rated voltage, being greater than low-voltage threshold value A % until be less than in the voltage range of overvoltage action threshold value C%, to be made as and allow closed action threshold value higher than low-voltage threshold value A % and lower than the ratio value B% of certain rated voltage in the interval of rated voltage, the present invention by higher than allowing closed action threshold value B% until be considered as the normal allowed band of electric power system voltage lower than the voltage range of overvoltage action threshold value C%, will be lower than, equal low-voltage threshold value A % or higher than, the voltage range that equals overvoltage action threshold value C% is considered as the improper allowed band of electric power system voltage.When the electric power system voltage detecting is in described normal allowed band when (> B%--< C%), high voltage quick-make loop 6 switch closures, protective device sends control signal, actuator driving circuit 4 orders about mechanical part motion, allow switch adhesive, negative feedback closed loop pulse-width modulation circuit 7 is according to the size of trip coil L1 current flowing afterwards, less average current drive actuator for control protective unit, maintain switch closure, thereby reduce under-voltage and power consumption over-pressure safety device, this not only can make device temperature rise reduce, more be conducive to energy-conservation, realize low-carbon economy.When the electric power system voltage detecting is in described improper allowed band when (≤A% or >=C%); protective device sends control signal; make state or the driving device part of actuator in disable switch electrical equipment closure that device for switching is disconnected immediately, thus protection power device or electrical equipment.
Brief description of the drawings
Can clearerly find out other advantages of the present invention and feature from following by reference to the accompanying drawings to the detailed description of only doing as non-limitative example, wherein:
Fig. 1 is the circuit diagram of energy-saving undervoltage of the present invention and an embodiment of over-pressure safety device.
Fig. 2 is the circuit diagram of voltage detecting circuit 5 of the present invention.
Fig. 3 is the output waveform figure of the voltage detecting circuit 5 shown in Fig. 2.
Fig. 4 is the circuit diagram of control circuit part 3 and actuator driving circuit 4.
Fig. 5 is the circuit diagram of logic control circuit 9 of the present invention, and wherein Fig. 5 a is the logic control relation schematic diagram of logic control circuit 9; The input and output annexation of Fig. 5 b presentation logic control circuit 9.
Fig. 6 is the schematic diagram of actuator driving circuit 4 voltage signals of the present invention, and wherein Fig. 6 a represents that actuator is in allowing and maintain the power save mode of switch closure; Fig. 6 b represents the state of actuator in the closed overvoltage protection of disable switch.
Fig. 7 is the circuit diagram of energy-saving undervoltage of the present invention and another embodiment of over-pressure safety device.
Fig. 8 is the voltage and current oscillogram at trip coil L1 two ends in actuator driving circuit 4 of the present invention.
Embodiment
Below in conjunction with the multiple embodiment shown in accompanying drawing 1 to 8, further describe energy-saving undervoltage of the present invention and over-pressure safety device.Energy-saving undervoltage of the present invention and over-pressure safety device are not limited to following execution mode.
The main circuit of the energy-saving undervoltage of the present invention shown in Fig. 1 and over-pressure safety device will comprise regulator rectifier circuit 2, actuator driving circuit 4, voltage detecting circuit 5, high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, overvoltage detection circuit 8 and logic control circuit 9.Wherein, regulator rectifier circuit 2 is made up of rectifier bridge, voltage-stabiliser tube etc., the AC power 1 of confessing electrical network responsible future becomes direct current, provides reliable and stable DC working power to control circuit part 3 and actuator driving circuit 4, and provides institute's energy requirement for each control circuit and actuator.As shown in Figure 1, control circuit part 3 of the present invention is made up of voltage detecting circuit 5, high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, overvoltage detection circuit 8 and logic control circuit 9, the formation of these circuit and annexation will describe in detail in conjunction with Fig. 4 below, and their operation principle will illustrate in conjunction with Fig. 5 and 6 below.In Fig. 1,10 is such as breaker body of device for switching, and circuit breaker is subject to the actuating signal control of its controller or annex, for carrying out connection and the disjunction of AC power and load circuit.When supply power voltage is during in improper allowed band; apparatus of the present invention produce control signal control actuator; drive actuator's mechanical part that the circuit breaker of closure state is disconnected immediately or forbid breaker closing by actuator, thus protection power device or electrical equipment.
The embodiment of a voltage detecting circuit 5 of the present invention as shown in Figure 2, it is made up of discrete resistors 12,13 and the electric capacity 14 in parallel with resistance 13, voltage detecting circuit 5 is sampled to electric power system voltage, for detection of the voltage of the AC power 1 from power supply network input with signal is carried out to amplification filtering processing.In figure 11 be from regulator rectifier circuit 2 input voltage detection circuits 5 through the voltage signal of full-wave rectification, 15 voltage detection signals of exporting for voltage detecting circuit 5.
Fig. 3 is the output waveform schematic diagram of voltage detecting circuit 5 stable states shown in Fig. 2, wherein abscissa is the time, ordinate is the ratio value of voltage magnitude and rated voltage, the detection signal that in figure, the curve of solid line is voltage waveform, its average has represented the amplitude of the voltage signal of input, and in figure, the part of dotted line represents the threshold value of foregoing setting.As shown in the figure, the voltage signal 15 of exporting when voltage detecting circuit 5 is equal to or less than predefined low-voltage threshold value A %(taking 35% as example) time, protective device of the present invention is forbidden breaker body closure.When voltage signal 15 equal or higher than predefined permission closed action threshold value B%(taking 70% as example) and lower than overvoltage action threshold value C%(taking 110% as example) time, protective device allows Switch main body closure.When voltage signal 15 equals or moves threshold value C%(taking 110% as example higher than overvoltage) time, protective device is forbidden breaker body mechanical part closure.
Fig. 4 is the circuit diagram of an embodiment of control loop part 3 of the present invention and actuator driving circuit 4.Referring to the embodiment of Fig. 4, wherein, actuator driving circuit 4 comprises power device T2, sustained diode 1 and the trip coil L1 being connected in parallel with sustained diode 1, power device T2 is IGBT switching tube in the present embodiment, its grid receives the signal 20 of exporting from logic control circuit 9, its drain electrode is connected with the positive pole of sustained diode 1, and source electrode is connected with the inverting input of the operational amplifier A 2 of negative feedback closed loop pulse-width modulation circuit 7.The negative pole of sustained diode 1 is connected with power supply VCC2, and the power supply VCC2 of actuator driving circuit 4 can be identical with the power supply VCC1 of high voltage quick-make circuit 6.
As previously mentioned, the control loop part 3 in Fig. 1 comprises voltage detecting circuit 5, high voltage quick-make circuit 6, negative feedback closed loop pulse-width modulation circuit 7, overvoltage detection circuit 8 and logic control circuit 9.Illustrate respectively that these form the composition structure of each main circuit of apparatus of the present invention control loop part 3 below.
As shown in Figure 4, high voltage quick-make circuit 6 is by operational amplifier A 1, 4 resistance R 1, R2, R3, R4 and capacitor C 1 and triode T1 composition, it is the quick-make switch control circuit being made up of the RC circuit of resistance and capacitances in series, wherein the voltage signal of the normal phase input end of operational amplifier A 1 is the voltage detection signal 15 that voltage detecting circuit 5 is exported, the voltage signal V1 of inverting input has represented the threshold signal B% setting in advance, the output of operational amplifier A 1 is through the first resistance R 1, capacitor C 1, the second resistance R 2 is connected with the base stage of triode T1, the collector electrode of triode T1 connects power supply VCC1 through the 3rd resistance R 3, an input 16 of the emitter andlogic control circuit 9 of triode T1 is connected, for it provides quick-make switch signal, and the emitter of triode T1 is through the 4th resistance R 4 ground connection.
Negative feedback closed loop pulse-width modulation circuit 7 shown in Fig. 4, by the big or small signal of current flowing in the trip coil L1 of detection actuator driving circuit 4, maintains the closure state of switch with less average current.The negative feedback closed loop pulse-width modulation circuit 7 that this low-voltage keeps is made up of 3 resistance R 5, R6, R7 and comparator A2, the voltage detection signal 15 that voltage detecting circuit 5 is exported is connected to the normal phase input end of comparator A2 through the 5th resistance R 5, the output of the 5th resistance R 5 is through the 6th resistance R 6 ground connection.The inverting input of comparator A2 is connected with the source electrode of the power switch pipe T2 of actuator driving circuit 4, and through the 7th resistance R 7 ground connection, the output of comparator A2 provides control signal to the input 17 of logic control circuit 9.The operation principle of negative feedback closed loop pulse-width modulation circuit 7 is: the voltage detection signal 15 of being exported by voltage detecting circuit 5 is through the 5th resistance R 5 and the 6th resistance R 6 dividing potential drops, in the time that the branch pressure voltage of the node VR6 shown in Fig. 6 is greater than the voltage of node VR7, comparator A2 exports high level, by making the power switch pipe T2 conducting of actuator driving circuit 4 after logic control circuit 9, the power supply DC that makes to thread off is all added on trip coil L1, increase so flow through the electric current exponentially rule of trip coil L1, sustained diode 1 is ended.In the time that the branch pressure voltage of node VR6 is less than the voltage of node VR7, the comparator A2 output low level of negative feedback closed loop pulse-width modulation circuit 7, make the power switch pipe T2 cut-off of actuator driving circuit 4, trip coil L1 is through sustained diode 1 afterflow, and the electric current exponentially rule that flows through trip coil L1 reduces.Like this, owing to flowing through, the current ratio of trip coil L1 is more steady, has both ensured that actuator had stable suction, can maintain again energy-conservation closure, therefore, negative feedback closed loop pulse-width modulation circuit 7 of the present invention is that a kind of low-voltage keeps negative feedback closed loop pulse-width modulation circuit.
In Fig. 4, overvoltage detection circuit 8 forms by comparator A3 with the N1 that its output is connected in series, and wherein A3 is operational amplifier, and N1 is inverter, and wherein N1 also can be realized by operational amplifier.Wherein, the voltage signal of the normal phase input end of operational amplifier A 3 is the voltage detection signal 15 that voltage detecting circuit 5 is exported; in Fig. 4, the symbol V2 of the input voltage of comparator A3 inverting input has represented the overvoltage protection action threshold value C% setting in advance; in the time that supply power voltage exceedes this action threshold value; the output output high-level control signal of operational amplifier A 3, is converted to low level signal and offers the input 18 of logic control circuit 9 through inverter N1.
Fig. 5 is the circuit diagram of logic control circuit 9 of the present invention, and wherein Fig. 5 a is the logic control relation schematic diagram of logic control circuit 9; The input and output annexation of Fig. 5 b presentation logic control circuit 9.Logic control circuit 9 is made up of comparator and logical circuit, and comparator comprises over-voltage comparator and under voltage comparator.Input and output annexation in conjunction with the logic control relation of the logical circuit of logic control circuit 9 as shown in Figure 5 a and logic control circuit 9 is as shown in Figure 5 b known, and logic control circuit 9 has 3 signal input parts 16,17,18 and a signal output part 19.Wherein, signal input part 16 receives the output signal of high voltage quick-make circuit 6, signal input part 17 receives the output signal of negative feedback closed loop pulse-width modulation circuit 7, signal 18 is the output signal of overvoltage detection circuit 8, what output 19 was exported is the logic operation result signal of 3 input signals 16,17,18 of this logic control circuit, allow signal with 1 representative, 0 represents inhibit signal.Voltage 15 >=the C% of the power supply network detecting when voltage detecting circuit 5 or≤A% is during in improper voltage range, over-voltage comparator or under voltage comparator are forbidden closure or tripping operation control signal to actuator driving circuit 4 outputs.For example, when supply power voltage moves threshold value C% higher than overvoltage protection, the input signal 18 providing from overvoltage detection circuit 8 is 0, and now the output signal 19 1 of logic control circuit 9 is decided to be 0; Otherwise; when supply power voltage moves threshold value A % lower than under-voltage protection; the input signal 16 providing from high voltage quick-make circuit 6 or the input signal 17 providing from negative feedback closed loop pulse-width modulation circuit 7 are 0, and now the output signal 19 1 of logic control circuit 9 is decided to be 0.When supply power voltage is when normal allowed band (> B%--< C%), the input signal 16 providing from high voltage quick-make circuit 6 or the input signal 17 providing from negative feedback closed loop pulse-width modulation circuit 7 are 1, and the equal like this output signal 19 that makes logic control circuit 9 is 1.An embodiment of logic control circuit 9 as shown in Figure 5 b, in the time that the input signal 18 providing from overvoltage detection circuit 8 is low level, the output signal 19 of logic control circuit 9 is also low level, when the input signal 18 from overvoltage detection circuit 8, while being high level from the input signal 16 of high voltage quick-make circuit 6 or from the signal 17 of negative feedback closed loop pulse-width modulation circuit 7, the output signal 19 of logic control circuit 9 is high level.
By the explanation about the operation principle of each main circuit of above-mentioned formation apparatus of the present invention control loop part 3 below in conjunction with Fig. 4-6, the logic control relation of the logical circuit of logic control circuit 9 of the present invention will become easy to understand more.
Fig. 6 is the schematic diagram of actuator driving circuit 4 voltage signals of the present invention, and wherein Fig. 6 a represents that actuator is in allowing and maintain the power save mode of switch closure; Fig. 6 b represents the state of actuator in the closed overvoltage protection of disable switch.
As shown in Figure 6 a, if suppose, the voltage of voltage detection signal 15 rises gradually, to the t1 moment, the 70%(that is greater than rated voltage when the power supply voltage signal detecting is predefined permission closed action threshold value B%) time, when electric power system voltage is during higher than the voltage V1 of the inverting input of the operational amplifier A 1 of high voltage quick-make circuit 6, operational amplifier A 1 is exported high level, capacitor C1 produces impulse response, its both end voltage is raise rapidly, make triode T1 conducting by resistance R 2, because having electric current to flow through in resistance R 4, the emitter of triode T1 is now exported high level, effective control signal is exported to logic control circuit 9 in high voltage quick-make loop 6, thereby export to 4 one logical operation control signals 19 of actuator driving circuit by connected logic control circuit 9, make the power switch pipe T2 conducting of actuator driving circuit 4, the supply voltage that makes to thread off is added on trip coil L1 entirely, so release action, thereby make actuator in allowing the state of switch closure.Like this, when the voltage of high input voltage quick-make circuit 6 is during in normal allowed band, apparatus of the present invention can power on to power consumption equipment or electrical equipment fast.
As shown in Figure 6 a, high voltage quick-make loop 6 is only operated in t1 to the t2 time period in Fig. 6 a.T1 to the t2 time period in Fig. 6 a, the capacitor C 1 of high voltage quick-make circuit 6 is discharged by resistance R 2, triode T1, in the time that capacitor C 1 discharge voltage arrives certain value, and for example t2 moment in Fig. 6 a, triode T1 cut-off, high voltage quick-make circuit 6 stops exporting high level.
In the time that supply power voltage increases, voltage detection signal 15 amplitudes rise, due to the negative feedback of the 7th resistance R 7 of negative feedback closed loop pulse-width modulation circuit 7, the anti-phase input terminal voltage of the comparator A2 of negative feedback closed loop pulse-width modulation circuit 7 is raised, thereby the output pulse width of comparator A2 is narrowed, so the average current flowing through in the trip coil L1 of actuator driving circuit 4 is remained unchanged substantially.Otherwise, in the time that supply power voltage reduces, the negative feedback existing due to the voltage at the 7th resistance R 7 two ends of negative feedback closed loop pulse-width modulation circuit 7, the anti-phase input terminal voltage of comparator A2 is also decreased, thereby the output pulse width of comparator A2 is broadened, can make equally the average current flowing through in the trip coil L1 of actuator driving circuit 4 substantially remain unchanged.After this stage finishes, negative feedback closed loop pulse-width modulation circuit 7 detects the size of current in the trip coil L1 of actuator driving circuit 4, the pulse control signal that output has a certain width to logic control circuit 9(referring to Fig. 4) input 17, i.e. t2 to the t3 time period in Fig. 6 a, electric current in the trip coil L1 of actuator driving circuit 4 is maintained to rational level, thereby reach the object of energy efficient.As shown in Figure 6 a, suppose the moment at t3, the voltage drop of voltage detection signal 15 is during to low-voltage threshold value A %, and logic control circuit 9 is exported invalid control signal 19 to actuator driving circuit 4, drive actuator action, carries out the operation of disable switch closure or disconnection power device.
The voltage signal of the actuator driving circuit of the present invention 4 as shown in Fig. 6 b; if suppose the moment at t4; the supply power voltage signal 15 of voltage detecting rises to and equals or during higher than overvoltage action threshold value C% from normal range (NR); the input 18 of control signal to logic control circuit 9 forbidden in overvoltage detection circuit 8 outputs; export to 4 one logical operation control signals 19 of driver actuation circuit through logic control circuit 9; make the state of actuator in disable switch closure, thereby reach the object of overvoltage protection.
Fig. 7 is the circuit block diagram of energy-saving undervoltage of the present invention and another embodiment of over-pressure safety device.Similar with the circuit of the embodiment of the energy-saving undervoltage of the present invention shown in Fig. 1 and over-pressure safety device, difference is that control loop part 3 is to be made up of voltage detecting circuit 5, feedback signal filtering and amplifying circuit 20, ADC module 21 and microprocessor 22.As shown in Figure 7, voltage detecting circuit 5 is connected with power supply, voltage detecting circuit 5 is connected with the input of ADC module 21 with the output of feedback signal filtering and amplifying circuit 20, and, another output of feedback signal filtering and amplifying circuit 20 provides output signal to actuator driving circuit 4, the output of ADC module 21 connects microprocessor 22, and the output of microprocessor 22 provides control signal to actuator driving circuit 4.Wherein ADC module 21 also can be included in microprocessor 22.Its operation principle is: the analog signal of being exported by voltage detecting circuit 5 and feedback signal filtering and amplifying circuit 20, be converted to digital signal through ADC module 21 and export to microprocessor 22, compare through microprocessor 22 and the under-voltage and overvoltage action threshold value setting in advance.When the electric power system voltage detecting is in described normal allowed band when (> B%--< C%); microprocessor 22 outputs allow closure signal to actuator driving circuit 4; actuator driving circuit 4 orders about mechanical part motion; allow switch adhesive; and; its microprocessor 22 can supply power voltage during in normal allowed band output class be similar to the control signal of the voltage waveform in Fig. 6 a; less average current drive actuator for control protective unit; maintain switch energy-saving closure
Thereby drive actuator also can reach the object of the power consumption that reduces protective device.When the electric power system voltage detecting is in described improper allowed band when (≤A% or >=C%); microprocessor 22 is exported inhibit signal to actuator driving circuit 4; make state or the driving device part of actuator in disable switch electrical equipment closure that device for switching is disconnected immediately, thus protection power device or electrical equipment.
In the above embodiment of the present invention, in the actuator driving circuit 4 shown in Fig. 4, the typical curve of the voltage U L1 at trip coil L1 two ends and the current waveform IL1 of trip coil L1 is as Fig. 8.In the actuator driving circuit 4 shown in Fig. 8, in the voltage and current oscillogram at trip coil L1 two ends, Tn is n cycle, and Tn+1 is n+1 cycle,
The width w of the pulse of UL1 can narrow along with the rising of supply power voltage.
The applicant controls the electric current of loop circuit and actuator consumption when adopting hold mode under three kinds of different operating voltage conditions of energy-saving undervoltage of the present invention and over-pressure safety device and existing product and tests and compare; the results are shown in Table 1; can find out; the electric current of protective device consumption of the present invention be less than existing product consume electric current 50%, energy-saving effect is remarkable.
Table 1
Claims (8)
1. energy-saving undervoltage and an over-pressure safety device, comprising:
Regulator rectifier circuit (2), for confessing that the AC power (1) of electrical network becomes direct current in the future, provide reliable and stable DC working power and institute's energy requirement to control circuit part (3) and actuator driving circuit (4);
Described control circuit part (3) detects from the voltage of regulator rectifier circuit (2) output, in the time that voltage is equal to or less than predefined low-voltage threshold value A %, or in the time that voltage equals or moves threshold value C% higher than overvoltage, described control circuit part (3) is forbidden closed control signal or the control signal of tripping operation to actuator driving circuit (4) output, in the time that voltage equals or moves threshold value C% higher than predefined permission closed action threshold value B% and lower than overvoltage, described control circuit part (3) is exported the pulse-width modulation control signal that allows closed control signal or maintain energy-conservation closure to actuator driving circuit (4),
Described actuator driving circuit (4) is connected with control circuit part (3), in the time that supply power voltage increases, the pulsewidth of the described pulse-width modulation control signal that maintains energy-conservation closure narrows, in the time that supply power voltage reduces, described in maintain the pulse-width modulation control signal of energy-conservation closure pulsewidth broaden; Described actuator driving circuit (4) is connected with breaker body actuator, according to the control signal of described control circuit part (3) output, actuator driving circuit (4) drives the action of breaker body mechanical part.
2. energy-saving undervoltage according to claim 1 and over-pressure safety device, it is characterized in that: described control circuit part (3) is by voltage detecting circuit (5), high voltage quick-make circuit (6), negative feedback closed loop pulse-width modulation circuit (7), overvoltage detection circuit (8) and logic control circuit (9) form, the voltage detecting circuit (5) being connected with AC power is respectively to high voltage quick-make circuit (6), negative feedback closed loop pulse-width modulation circuit (7), the input of overvoltage detection circuit (8) provides voltage detection signal (15), described high voltage quick-make circuit (6), negative feedback closed loop pulse-width modulation circuit (7), the output of overvoltage detection circuit (8) is respectively to logic control circuit (9) output signal, wherein the signal output part of logic control circuit (9) provides control signal to actuator driving circuit (4), described actuator driving circuit (4) is connected with negative feedback closed loop pulse-width modulation circuit (7).
3. energy-saving undervoltage according to claim 1 and over-pressure safety device, it is characterized in that: described control circuit part (3) is by voltage detecting circuit (5), feedback signal filtering and amplifying circuit (20), ADC module (21) and microprocessor (22) form, the voltage detecting circuit (5) being connected with AC power is connected with the input of ADC module (21) respectively with the output of feedback signal filtering and amplifying circuit (20), the output of ADC module (21) connects microprocessor (22), the output of microprocessor (22) provides control signal to actuator driving circuit (4), described actuator driving circuit (4) is connected with feedback signal filtering and amplifying circuit (20).
4. energy-saving undervoltage according to claim 2 and over-pressure safety device, it is characterized in that: described actuator driving circuit (4) comprises power switch pipe T2, sustained diode 1 and the trip coil L1 being connected in parallel with sustained diode 1, the grid of power switch pipe T2 receives the signal from the signal output part (19) of logic control circuit (9), its drain electrode is connected with the positive pole of sustained diode 1, source electrode is connected with the inverting input of the comparator A2 of negative feedback closed loop pulse-width modulation circuit (7), the negative pole of sustained diode 1 is connected with power supply VCC2.
5. energy-saving undervoltage according to claim 2 and over-pressure safety device, it is characterized in that: described high voltage quick-make circuit (6) comprises operational amplifier A 1, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and capacitor C 1 and triode T1, wherein, the voltage signal of the normal phase input end of operational amplifier A 1 is the voltage detection signal (15) of voltage detecting circuit (5) output, the voltage signal V1 of inverting input is the permission closed action threshold value B% setting in advance, the output of operational amplifier A 1 is through the first resistance R 1, capacitor C 1, the second resistance R 2 is connected with the base stage of triode T1, the collector electrode of triode T1 connects power supply VCC1 through the 3rd resistance R 3, the first signal input (16) of the emitter andlogic control circuit (9) of triode T1 is connected, for it provides quick-make switch control signal, and the emitter of triode T1 is through the 4th resistance R 4 ground connection.
6. energy-saving undervoltage according to claim 2 and over-pressure safety device, it is characterized in that: described negative feedback closed loop pulse-width modulation circuit (7) comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and comparator A2, wherein, the normal phase input end of comparator A2 is through the voltage detection signal (15) of the 5th resistance R 5 receiver voltage testing circuit (5) outputs, the output of the 5th resistance R 5 is through the 6th resistance R 6 ground connection, the inverting input of comparator A2 is connected with the source electrode of the power switch pipe T2 of actuator driving circuit (4), and through the 7th resistance R 7 ground connection, the output of comparator A2 provides control signal to the secondary signal input (17) of logic control circuit (9).
7. energy-saving undervoltage according to claim 2 and over-pressure safety device, it is characterized in that: the inverter N1 that described overvoltage detection circuit (8) comprises comparator A3 and is connected in series with its output, wherein comparator A3 is operational amplifier, inverter N1 is also realized by operational amplifier, the voltage signal of the normal phase input end of comparator A3 is the voltage detection signal (15) of voltage detecting circuit (5) output, the symbol V2 of the input voltage of its inverting input has represented the overvoltage action threshold value C% setting in advance, its output provides control signal to the 3rd signal input part (18) of logic control circuit (9).
8. energy-saving undervoltage according to claim 2 and over-pressure safety device, it is characterized in that: described logic control circuit (9) has 3 signal input parts (16, 17, 18), first signal input (16) receives the output signal of high voltage quick-make circuit (6), secondary signal input (17) receives the output signal of negative feedback closed loop pulse-width modulation circuit (7), the 3rd signal input part (18) receives the output signal of overvoltage detection circuit (8), logic control circuit (9) has signal output part (19), described logic control circuit (9) is according to 3 signal input parts (16, 17, 18) logic operation result of input signal is forbidden closure or tripping operation or allows closure or maintain energy-conservation closed pulse-width modulation control signal to actuator driving circuit (4) output, described logic control circuit (9) meets following logic control relation: in the time that the 3rd input signal providing from overvoltage detection circuit (8) is low level, the output signal of the signal output part (19) of logic control circuit (9) is also low level, in the time being high from the 3rd input signal of overvoltage detection circuit (8), while being high level from the first input signal of high voltage quick-make circuit (6) or from the second input signal of negative feedback closed loop pulse-width modulation circuit (7), the output signal of the signal output part (19) of logic control circuit (9) is high level.
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| CN201110036010.7A CN102097778B (en) | 2011-02-11 | 2011-02-11 | Energy-saving undervoltage/overvoltage protective device |
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| CN102790375B (en) * | 2012-08-06 | 2015-04-22 | 上海诺雅克电气有限公司 | Direct current undervoltage release and circuit breaker |
| CN103051206B (en) * | 2012-12-13 | 2015-11-18 | 深圳和而泰智能控制股份有限公司 | Fresh-keeping device power control circuit, device and control method thereof |
| DE102013212379B3 (en) * | 2013-06-27 | 2014-09-11 | Robert Bosch Gmbh | Method for operating a microcomputer device |
| CN103715661A (en) * | 2013-12-20 | 2014-04-09 | 柳州腾龙煤电科技股份有限公司 | Power supply protection device used in geological exploration field |
| CN105186444B (en) * | 2015-07-27 | 2019-02-05 | 昆山龙腾光电有限公司 | A kind of power supply protection circuit |
| CN106571616B (en) * | 2015-10-10 | 2019-11-29 | 中兴通讯股份有限公司 | Power supply suspend mode and wake-up circuit |
| CN105406866B (en) * | 2015-12-10 | 2018-08-21 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of analog to digital conversion circuit over-voltage protection method |
| CN107508258B (en) * | 2016-06-14 | 2019-10-11 | 浙江正泰电器股份有限公司 | The buckle releaser of breaker |
| CN107666305B (en) * | 2017-10-30 | 2023-10-03 | 杭州乾龙电器有限公司 | Intelligent switch |
| CN108490248B (en) * | 2018-03-13 | 2023-04-07 | 浙江海洋大学 | Voltage monitoring and protecting device |
| CN109449512A (en) * | 2018-11-28 | 2019-03-08 | 西安电子科技大学 | A kind of detection of multisection lithium battery voltage and protection circuit |
| CN110749789A (en) * | 2019-10-14 | 2020-02-04 | 北京汽车股份有限公司 | High-voltage output closed-loop control device, method and equipment of safety test equipment |
| CN110706472A (en) * | 2019-11-08 | 2020-01-17 | 桂林航天电子有限公司 | SSPC system and method based on wireless communication |
| CN115173365B (en) * | 2022-07-28 | 2024-05-03 | 瀚昕微电子(无锡)有限公司 | Control method of overvoltage protection device and overvoltage protection device |
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Application publication date: 20110615 Assignee: ZHEJIANG CHINT ELECTRICS Co.,Ltd. Assignor: SHANGHAI NOARK ELECTRIC Co.,Ltd. Contract record no.: X2021330000593 Denomination of invention: An energy-saving undervoltage and overvoltage protection device Granted publication date: 20140806 License type: Common License Record date: 20211025 |
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