CN202076774U - Energy-saving undervoltage/overvoltage protective device - Google Patents
Energy-saving undervoltage/overvoltage protective device Download PDFInfo
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- CN202076774U CN202076774U CN2011200362432U CN201120036243U CN202076774U CN 202076774 U CN202076774 U CN 202076774U CN 2011200362432 U CN2011200362432 U CN 2011200362432U CN 201120036243 U CN201120036243 U CN 201120036243U CN 202076774 U CN202076774 U CN 202076774U
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Abstract
The utility model provides an energy-saving undervoltage/overvoltage protective device. The device comprises a rectifying and voltage-stabilizing circuit which provides a stable and reliable DC working power to a control circuit part and an actuator driving circuit and provides energy required for a circuit breaker actuating mechanism. The control circuit part detects a voltage output from the rectifying and voltage-stabilizing circuit. When the voltage is equal to or lower than a preset undervoltage action threshold or the voltage is equal to or higher than an overvoltage action threshold, the control circuit part outputs a control signal of unallowed closing operation to the actuator driving circuit. When the voltage is equal to or higher than a preset allowed closing action threshold or lower than an overvoltage action threshold, the control circuit part outputs a control signal of allowed closing operation to the actuator driving circuit. According to the control signals outputted from the control circuit part, the actuator driving circuit drives the mechanical part of a circuit breaker to execute the operation of not allowing closing, the operation of allowing closing, the operation of maintaining energy-saving closing or the operation of tripping. The current consumption is reduced by 50% as compared with the prior art.
Description
Technical field
The utility model relate to a kind of new-type energy-saving under-voltage/over-pressure safety device, this device is fit to be applied to that the current supply circuit to electrical equipment and equipment cut-offs in the protective device of control when supply power voltage exceeds normal allowed band.When supply power voltage was lower than or exceed the setting threshold scope, this protective device produced control signal, and driving switch electrical equipment for example circuit breaker tripping tripping operation 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
Development along with 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 the afunction or the permanent damages of power device or electrical equipment, cause economic loss, even cause disaster.
The problem that multiple scheme solves under-voltage/overvoltage protection is proposed in the prior art; a kind of scheme such as publication number are the Chinese utility model patent of CN2924779Y; this scheme integrates under-voltage protecting circuit and leakage protection circuit; when in the 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 such as U.S. Pat 2009237187A1 (CN101512704A), this scheme is connected on the actuator of overvoltage signal controlling in the under-voltage protection loop, to realize overvoltage/under-voltage protection function, structure relative complex.Another scheme such as publication number are the Chinese invention patent application of CN101237137A, when supply power voltage exceeds normal range (NR), make the corresponding relays closure, thereby start the purpose that overcurrent protector is realized cutoff circuit.This scheme must cooperate overcurrent protector to realize under-voltage/over-voltage protecting function.
These existing under-voltage/overvoltage protection usually only take place under-voltage/during the overvoltage fault; produce the triggering signal drive actuator; make the switch can be closed; usually need provide lasting bigger current signal to keep triggering signal; cause noise height, big, the big problem of generating heat of power consumption easily, and the structure relative complex.
The utility model content
The purpose of this utility model provides a kind of energy-saving under-voltage/over-pressure safety device that improves function that has; when supply power voltage is in normal allowed band; this protective device adopts unique low current to keep technology to keep with few energy and allows the normal closure state of connecting of power supply; and can cut off the electricity supply in electric power system under-voltage or overvoltage (maximum that the minimum that promptly is lower than rated voltage is provided with ratio value A% or is higher than rated voltage is provided with ratio value C%) time; not only noise is low; energy-saving and environment friendly; the equipment noise that has overcome prior art is big; power consumption is big; the big shortcoming of generating heat, and the disaster of reliably having avoided power consumption equipment to damage and may bring.
To achieve these goals, the utility model has adopted following technical scheme.
Of the present utility model energy-saving under-voltage/over-pressure safety device comprises:
According to a kind of execution mode of the present utility model, 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 constitute, the voltage detecting circuit 5 that is 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, and 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 kind of execution mode of the present utility model, described control loop part 3 is by voltage detecting circuit 5, feedback signal amplification filtering circuit 20, ADC module 21 and microprocessor 22 constitute, the voltage detecting circuit 5 that is connected with power supply is connected with the output of feedback signal amplification filtering circuit 20 and with the input of ADC module 21, and, another output of feedback signal amplification filtering 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.ADC module 21 also can lump together the microprocessor of promptly built-in ADC module with microprocessor 22.
Described actuator driving circuit 4 comprises power device T2, sustained diode 1 and the trip coil L1 that is 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, first resistance R 1, 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 outputs, the voltage signal V1 of inverting input is the threshold signal B% that sets in advance, the output of operational amplifier A 1 is through first resistance R 1, capacitor C 1, 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 emitter of triode T1 is connected with an input 16 of logic control circuit 9, for it provides the 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 normal phase input end of comparator A2 receives the voltage detection signal 15 of voltage detecting circuit 5 outputs 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.
Described overvoltage detection circuit 8 comprises comparator A3 and the inverter N1 that is connected in series with its output; wherein A3 is an 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 of voltage detecting circuit 5 outputs; the symbol V2 of the input voltage of its inverting input has represented the overvoltage protection action threshold value C% that sets 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 is forbidden 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 satisfies following logic control relation: when the input signal 18 that provides from overvoltage detection circuit 8 is low level, the output signal 19 of logic control circuit 9 also is a low level, when from the input signal 18 of overvoltage detection circuit 8, when 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/over-pressure safety device that the utility model provides has following characteristics: the minimum that will be lower than rated voltage is provided with ratio value A% and is made as the low-voltage threshold value; the maximum that will be higher than rated voltage is provided with ratio value C% and is made as overvoltage action threshold value; greater than low-voltage threshold value A % in voltage range less than overvoltage action threshold value C%; the ratio value B% that will be higher than low-voltage threshold value A % and be lower than certain rated voltage in rated voltage interval is made as and allows the closed action threshold value; the utility model will be higher than and allow closed action threshold value B% to be considered as the normal allowed band of electric power system voltage until the voltage range that is lower than overvoltage action threshold value C%, will be lower than; equal low-voltage threshold value A % or be 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 that detects is in the described normal allowed band (during＞B%--＜C%); high voltage quick-make loop 6 switch closures; protective device sends control signal; actuator driving circuit 4 orders about the mechanical part motion; allow the switch adhesive; negative feedback closed loop pulse-width modulation circuit 7 flows through the size of electric current according to trip coil L1 afterwards; the control protective device is with less average current drive actuator; keep switch closure; thereby reduced the power consumption of under-voltage/over-pressure safety device; this not only can make the device temperature rise reduce, and more helps energy-conservationly, realizes low-carbon economy.When the electric power system voltage that detects be in the described improper allowed band (≤A% or 〉=C%) time; protective device sends control signal; the state or the driving device that make actuator be in disable switch electrical equipment closure partly make device for switching disconnect immediately, thus protection power device or electrical equipment.
Description of drawings
Can clearerly find out other advantages of the present utility model and feature from following in conjunction with the accompanying drawings to the detailed description of only doing as non-limitative example, wherein:
Fig. 1 be of the present utility model energy-saving under-voltage/circuit diagram of an embodiment of over-pressure safety device.
Fig. 2 is the circuit diagram of voltage detecting circuit 5 of the present utility model.
Fig. 3 is the output waveform figure of voltage detecting circuit 5 shown in Figure 2.
Fig. 4 is the circuit diagram of control circuit part 3 and actuator driving circuit 4.
Fig. 5, Fig. 6 are the circuit diagrams of logic control circuit 9 of the present utility model, and wherein Fig. 5 is the logic control relation schematic diagram of logic control circuit 9; The input and output annexation of Fig. 6 presentation logic control circuit 9.
Fig. 7, Fig. 8 are the schematic diagrames of actuator driving circuit 4 voltage signals of the present utility model, and wherein Fig. 7 represents that actuator is in the power save mode that allows and keep switch closure; Fig. 8 represents that actuator is in the state of the closed overvoltage protection of disable switch.
Fig. 9 be of the present utility model energy-saving under-voltage/circuit diagram of another embodiment of over-pressure safety device.
Figure 10 is the voltage and current oscillogram at trip coil L1 two ends in the actuator driving circuit 4 of the present utility model.
Embodiment
Below in conjunction with a plurality of embodiment shown in the accompanying drawing 1 to 8, further describe of the present utility model energy-saving under-voltage/over-pressure safety device.Of the present utility model energy-saving under-voltage/over-pressure safety device is not limited to following execution mode.
The circuit of of the present utility model energy-saving under-voltage/over-pressure safety device shown in Figure 1 mainly comprises 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 described in the utility model is made 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 specify in conjunction with Fig. 5, Fig. 6 and Fig. 7, Fig. 8 below.10 is for example breaker body of device for switching among Fig. 1, and circuit breaker is controlled by the actuating signal of its controller or annex, is used to carry out the connection and the disjunction of AC power and load circuit.When supply power voltage is in improper allowed band; the utility model device produces control signal control actuator; drive actuator's mechanical part by actuator and the circuit breaker of closure state is disconnected immediately or forbid breaker closing, thus protection power device or electrical equipment.
The embodiment of a voltage detecting circuit 5 of the present utility model as shown in Figure 2, it is made up of discrete resistors 12,13 and the electric capacity 14 in parallel with resistance 13,5 pairs of electric power system voltages of voltage detecting circuit are sampled, and are used to detect from the voltage of the AC power 1 of power supply network input and signal are carried out amplification filtering handle.11 is that 15 is the voltage detection signal of voltage detecting circuit 5 outputs from the voltage signal of the process full-wave rectification of regulator rectifier circuit 2 input voltage detection circuits 5 among the figure.
Fig. 3 is the output waveform schematic diagram of voltage detecting circuit 5 stable states shown in Figure 2, wherein abscissa is the time, ordinate is the ratio value of voltage magnitude and rated voltage, the curve of solid line is the detection signal of voltage waveform among the figure, its average has been represented the amplitude of the voltage signal of input, and the part of dotted line is represented foregoing preset threshold among the figure.As shown in the figure, when the voltage signal 15 of voltage detecting circuit 5 outputs was equal to or less than predefined low-voltage threshold value A % (is example with 35%), protective device of the present utility model was forbidden the breaker body closure.When voltage signal 15 equaled or be higher than predefined permission closed action threshold value B% (is example with 70%) and be lower than overvoltage action threshold value C% (is example with 110%), protective device allowed the Switch main body closure.When voltage signal 15 equaled or be higher than overvoltage action threshold value C% (is example with 110%), protective device was forbidden breaker body mechanical part closure.
Fig. 4 is the circuit diagram of an embodiment of control loop part 3 of the present utility model and actuator driving circuit 4.Embodiment referring to Fig. 4, wherein, actuator driving circuit 4 comprises power device T2, sustained diode 1 and the trip coil L1 that is connected in parallel with sustained diode 1, power device T2 is the IGBT switching tube in the present embodiment, its grid receives the signal 20 from logic control circuit 9 outputs, 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 among 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 below these constitute the composition structure of each main circuit of the utility model device control loop part 3.
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 form, it is the quick-make switch control circuit that the RC circuit by resistance and capacitances in series constitutes, 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 outputs, the voltage signal V1 of inverting input has promptly represented the threshold signal B% that sets in advance, the output of operational amplifier A 1 is through first resistance R 1, capacitor C 1, 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 emitter of triode T1 is connected with an input 16 of logic control circuit 9, for it provides the 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 Figure 4 is kept the closure state of switch by flowing through the signal of the size of electric current among the trip coil L1 that detects actuator driving circuit 4 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 of voltage detecting circuit 5 output is connected to the normal phase input end of comparator A2 through the 5th resistance R 5, and 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: by the voltage detection signal 15 of voltage detecting circuit 5 output through the 5th resistance R 5 and the 6th resistance R 6 dividing potential drops, as Fig. 7, node VR shown in Figure 8
6Branch pressure voltage greater than node VR
7Voltage the time, comparator A2 exports high level, by making the power switch pipe T2 conducting of actuator driving circuit 4 behind the logic control circuit 9, dropout power supply DC all is added on the trip coil L1, increase so flow through the electric current exponentially rule of trip coil L1, sustained diode 1 is ended.As node VR
6Branch pressure voltage less than node VR
7Voltage the time, the comparator A2 output low level of negative feedback closed loop pulse-width modulation circuit 7 is ended the power switch pipe T2 of actuator driving circuit 4, trip coil L1 is through sustained diode 1 afterflow, the electric current exponentially rule that flows through trip coil L1 reduces.Like this, because it is more steady to flow through the current ratio of trip coil L1, has both guaranteed that actuator has stable suction, can keep energy-conservation closure again, therefore, negative feedback closed loop pulse-width modulation circuit 7 of the present utility model is that a kind of low-voltage keeps the negative feedback closed loop pulse-width modulation circuit.
Among Fig. 4, overvoltage detection circuit 8 is formed by comparator A3 with N1 that its output is connected in series, and wherein A3 is an operational amplifier, and N1 is an 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 of voltage detecting circuit 5 outputs; the symbol V2 of the input voltage of comparator A3 inverting input has represented the overvoltage protection action threshold value C% that sets in advance among Fig. 4; when supply power voltage surpasses this action threshold value; the output output high-level control signal of operational amplifier A 3 is converted to the input 18 that low level signal offers logic control circuit 9 through inverter N1.
Fig. 5, Fig. 6 are the circuit diagrams of logic control circuit 9 of the present utility model, and wherein Fig. 5 is the logic control relation schematic diagram of logic control circuit 9; The input and output annexation of Fig. 6 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.In conjunction with the input and output annexation of the logic control relation of the logical circuit of as shown in Figure 5 logic control circuit 9 and logic control circuit as shown in Figure 69 as can be known, logic control circuit 9 has 16,17,18 and signal output parts 19 of 3 signal input parts.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.When the voltage 15 〉=C% of voltage detecting circuit 5 detected power supply networks or≤when A% was in improper voltage range, over-voltage comparator or under voltage comparator were forbidden closure or tripping operation control signal to actuator driving circuit 4 outputs.For example, when supply power voltage was higher than overvoltage protection action threshold value C%, the input signal 18 that provides from overvoltage detection circuit 8 was 0, and this moment, the output signal 19 1 of logic control circuit 9 was decided to be 0; Otherwise; when supply power voltage is lower than under-voltage protection action threshold value A %; the input signal 16 that provides from high voltage quick-make circuit 6 or be 0 from the input signal 17 that negative feedback closed loop pulse-width modulation circuit 7 provides, this moment, the output signal 19 1 of logic control circuit 9 was decided to be 0.When supply power voltage is in normal allowed band (during＞B%--＜C%), the input signal 16 that provides from high voltage quick-make circuit 6 or be 1 from the input signal 17 that negative feedback closed loop pulse-width modulation circuit 7 provides, equal like this to make the output signal 19 of logic control circuit 9 be 1.An embodiment of logic control circuit 9 as shown in Figure 6, when the input signal 18 that provides from overvoltage detection circuit 8 is low level, the output signal 19 of logic control circuit 9 also is a low level, when from the input signal 18 of overvoltage detection circuit 8, when 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 below in conjunction with the explanation of Fig. 4-6 about the operation principle of each main circuit of above-mentioned formation the utility model device control loop part 3, the logic control relation of the logical circuit of the logic control circuit 9 of the present utility model easy to understand more that will become.
Fig. 7, Fig. 8 are the schematic diagrames of actuator driving circuit 4 voltage signals of the present utility model, and wherein Fig. 7 represents that actuator is in the power save mode that allows and keep switch closure; Fig. 8 represents that actuator is in the state of the closed overvoltage protection of disable switch.
As shown in Figure 7, if the voltage of hypothesis voltage detection signal 15 rises gradually, to t1 constantly, when the power supply voltage signal that detects during greater than 70% (being predefined permission closed action threshold value B%) of rated voltage, promptly when electric power system voltage is higher than the voltage V1 of inverting input of operational amplifier A 1 of high voltage quick-make circuit 6, operational amplifier A 1 output high level, capacitor C1 produces impulse response, its both end voltage is raise rapidly, make triode T1 conducting by resistance R 2, because of having electric current to flow through in the resistance R 4, the emitter of triode T1 is exported high level at this moment, then high voltage quick-make loop 6 output effective control signal are given logic control circuit 9, 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 dropout supply voltage is added on the trip coil L1 entirely, so the release action, thereby make actuator be in the state that allows switch closure.Like this, when the voltage of input high voltage quick-make circuit 6 was in normal allowed band, the utility model device can power on to power consumption equipment or electrical equipment fast.
As shown in Figure 7, high voltage quick-make loop 6 only is operated in t1 to the t2 time period among Fig. 7.T1 to the t2 time period in Fig. 7, the capacitor C 1 of high voltage quick-make circuit 6 is by resistance R 2, triode T1 discharge, and when capacitor C 1 discharge voltage arrived certain value, for example the t2 among Fig. 7 constantly, triode T1 ends, and high voltage quick-make circuit 6 stops to export high level.
When supply power voltage increases, voltage detection signal 15 amplitudes rise, because the negative feedback of the 7th resistance R 7 of negative feedback closed loop pulse-width modulation circuit 7, the inverting input 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 down, so the average current that flows through among the trip coil L1 of actuator driving circuit 4 is remained unchanged substantially.Otherwise, when supply power voltage reduces, because the negative feedback that the voltage at the 7th resistance R 7 two ends of negative feedback closed loop pulse-width modulation circuit 7 exists, the inverting input voltage of comparator A2 is also decreased, thereby the output pulse width of comparator A2 is broadened, the average current that flows through among the trip coil L1 of actuator driving circuit 4 is remained unchanged substantially.After this stage finishes, size of current among the trip coil L1 of negative feedback closed loop pulse-width modulation circuit 7 detection actuator driving circuits 4, output has the pulse control signal of certain width to give the input 17 of logic control circuit 9 (referring to Fig. 4), i.e. time period of t2 to t3 in Fig. 7, electric current among the trip coil L1 of actuator driving circuit 4 is maintained reasonable levels, thereby reach the purpose of energy efficient.As shown in Figure 7, suppose that constantly when the voltage of voltage detection signal 15 dropped to low-voltage threshold value A %, logic control circuit 9 was to the invalid control signal 19 of actuator driving circuit 4 outputs at t3, the operation of disable switch closure or disconnection power device is carried out in the drive actuator action.
The voltage signal of actuator driving circuit of the present utility model 4 as shown in Figure 8; if hypothesis at t4 constantly; the supply power voltage signal 15 of voltage detecting rises to from normal range (NR) and equals or when being higher than overvoltage action threshold value C%; overvoltage detection circuit 8 output forbids that control signal gives the input 18 of logic control circuit 9; export to 4 one logical operation control signals 19 of driver actuation circuit through logic control circuit 9; make actuator be in the state of disable switch closure, thereby reach the purpose of overvoltage protection.
Fig. 9 be of the present utility model energy-saving under-voltage/circuit block diagram of another embodiment of over-pressure safety device.Similar with the circuit of the embodiment of of the present utility model energy-saving under-voltage/over-pressure safety device shown in Figure 1, difference is that control loop part 3 is to be made of voltage detecting circuit 5, feedback signal amplification filtering circuit 20, ADC module 21 and microprocessor 22.As shown in Figure 9, 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 amplification filtering circuit 20, and, another output of feedback signal amplification filtering 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 the microprocessor 22.Its operation principle is: by the analog signal of voltage detecting circuit 5 with 20 outputs of feedback signal amplification filtering circuit, 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 that sets in advance.When the electric power system voltage that detects is in the described normal allowed band (during＞B%--＜C%); microprocessor 22 outputs allow closure signal to give actuator driving circuit 4; actuator driving circuit 4 orders about the mechanical part motion; allow the switch adhesive; and; its microprocessor 22 can be when supply power voltage be in normal allowed band output class be similar to the control signal of the voltage waveform among Fig. 7; the control protective device is with less average current drive actuator; keep the energy-conservation closure of switch, thereby drive actuator also can reach the purpose of the power consumption that reduces protective device.When the electric power system voltage that detects be in the described improper allowed band (≤A% or 〉=C%) time; then microprocessor 22 output inhibit signals are given actuator driving circuit 4; the state or the driving device that make actuator be in disable switch electrical equipment closure partly make device for switching disconnect immediately, thus protection power device or electrical equipment.
In the foregoing description of the present utility model, the voltage U at trip coil L1 two ends in the actuator driving circuit 4 shown in Figure 4
L1Current waveform I with trip coil L1
L1Typical curve such as Figure 10.In the voltage and current oscillogram at trip coil L1 two ends, Tn is a n cycle in actuator driving circuit shown in Figure 10 4, and Tn+1 is a n+1 cycle, U
L1The width w of pulse can narrow down along with the rising of supply power voltage.
The applicant to adopt of the present utility model energy-saving under-voltage/control loop circuit and actuator consumed current are tested and are compared during hold mode under three kinds of different operating voltage conditions of over-pressure safety device and existing product; the results are shown in Table 1; as can be seen; protective device consumed current of the present utility model is less than 50% of existing product consumed current, and energy-saving effect is remarkable.
Table 1
Claims (9)
- One kind energy-saving under-voltage/over-pressure safety device, comprising:Regulator rectifier circuit (2) is used 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);Described control circuit part (3) detects from the voltage of regulator rectifier circuit (2) output, when voltage is equal to or less than predefined low-voltage threshold value A %, perhaps when voltage equals or be higher than overvoltage action threshold value C%, described control circuit part (3) is forbidden closed control signal to actuator driving circuit (4) output, when voltage equaled or be higher than predefined permission closed action threshold value B% and be lower than overvoltage action threshold value C%, described control circuit part (3) allowed closed control signal to actuator driving circuit (4) output;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) drive the breaker body mechanical part carry out forbids closure, allow closed, keep energy-conservation closure or trip operation.
- 2. according to claim 1 energy-saving under-voltage/over-pressure safety device; it is characterized in that: 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) constitute; the voltage detecting circuit that is connected with power supply (5) 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); to logic control circuit (9) output signal, wherein the output of logic control circuit (9) provides control signal to actuator driving circuit 4 to the output of overvoltage detection circuit (8) respectively.
- 3. according to claim 1 energy-saving under-voltage/over-pressure safety device; it is characterized in that: described control loop part (3) is by voltage detecting circuit (5); feedback signal amplification filtering circuit (20); ADC module (21) and microprocessor (22) constitute; the voltage detecting circuit that is connected with power supply (5) is connected with the input of ADC module (21) respectively with the output of feedback signal testing circuit (20); the output of ADC module (21) connects microprocessor (22), and the output of microprocessor (22) provides control signal to actuator driving circuit (4).
- 4. according to claim 1 energy-saving under-voltage/over-pressure safety device; it is characterized in that: described actuator driving circuit (4) comprises power device T2; sustained diode 1 and the trip coil L1 that is connected in parallel with sustained diode 1; the grid of power switch pipe T2 receives the signal from logic control circuit (9) output (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.
- 5. according to claim 2 energy-saving under-voltage/over-pressure safety device; it is characterized in that: described high voltage quick-make circuit (6) comprises operational amplifier A 1; first resistance R 1; 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 threshold signal B% that sets in advance; the output of operational amplifier A 1 is through first resistance R 1; capacitor C 1; 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 emitter of triode T1 is connected with an input (16) of logic control circuit (9); for it provides the quick-make switch control signal, and the emitter of triode T1 is through the 4th resistance R 4 ground connection.
- 6. according to claim 2 energy-saving under-voltage/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 receives the voltage detection signal 15 of voltage detecting circuit 5 outputs 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).
- 7. according to claim 2 energy-saving under-voltage/over-pressure safety device; it is characterized in that: described overvoltage detection circuit (8) comprises comparator A3 and the inverter N1 that is connected in series with its output; wherein A3 is an 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) of voltage detecting circuit (5) output; the symbol V2 of the input voltage of its inverting input has represented the overvoltage protection action threshold value C% that sets in advance, and its output provides control signal to the input (18) of logic control circuit (9).
- 8. according to claim 2 energy-saving under-voltage/over-pressure safety device; it is characterized in that: described logic control circuit (9) comprises over-voltage comparator; under voltage comparator and logical circuit; logic control circuit (9) has (3) individual signal input part (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) individual input signal (16; 17; 18) logic operation result is forbidden closure or tripping operation control signal by over-voltage comparator or under voltage comparator to actuator driving circuit (4) output.
- 9. according to claim 8 energy-saving under-voltage/over-pressure safety device, it is characterized in that: described logic control circuit (9) satisfies following logic control relation: when the input signal (18) that provides from overvoltage detection circuit (8) was low level, the output signal (19) of logic control circuit (9) also was a low level; When the input signal (18) from overvoltage detection circuit (8) when being high, when 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200362432U CN202076774U (en) | 2011-02-11 | 2011-02-11 | Energy-saving undervoltage/overvoltage protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200362432U CN202076774U (en) | 2011-02-11 | 2011-02-11 | Energy-saving undervoltage/overvoltage protective device |
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| CN202076774U true CN202076774U (en) | 2011-12-14 |
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| CN2011200362432U Expired - Fee Related CN202076774U (en) | 2011-02-11 | 2011-02-11 | Energy-saving undervoltage/overvoltage protective device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097778A (en) * | 2011-02-11 | 2011-06-15 | 上海诺雅克电气有限公司 | Energy-saving undervoltage/overvoltage protective device |
| CN106899301A (en) * | 2015-12-18 | 2017-06-27 | 亚德诺半导体集团 | For the protection circuit of the adjustable resistance at continuous input ADC |
-
2011
- 2011-02-11 CN CN2011200362432U patent/CN202076774U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097778A (en) * | 2011-02-11 | 2011-06-15 | 上海诺雅克电气有限公司 | Energy-saving undervoltage/overvoltage protective device |
| CN106899301A (en) * | 2015-12-18 | 2017-06-27 | 亚德诺半导体集团 | For the protection circuit of the adjustable resistance at continuous input ADC |
| CN106899301B (en) * | 2015-12-18 | 2020-10-16 | 亚德诺半导体集团 | Protection circuit for adjustable resistance at continuous input ADC |
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