CN101316039A - Circuit apparatus - Google Patents
Circuit apparatus Download PDFInfo
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- CN101316039A CN101316039A CNA200710105409XA CN200710105409A CN101316039A CN 101316039 A CN101316039 A CN 101316039A CN A200710105409X A CNA200710105409X A CN A200710105409XA CN 200710105409 A CN200710105409 A CN 200710105409A CN 101316039 A CN101316039 A CN 101316039A
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Abstract
The invention relates to a circuit device, comprising a main circuit which is provided with an AC power terminal which is connected with an AC power, a loading part which receives the power which comes from the AC power and a current control part which can control the current which is supplied from the AC power to the loading part; the circuit device also comprises a control part which controls the actions of the current control part and a load transducer which is connected with the control part and detects the information of the current load state in the main circuit; the control part controls the current control part according to the load state value detected by the load transducer or the load state value speculated by the information detected by the load transducer, so as to cut off the power supplied to the load part when the current in the main circuit achieves the specific load state value, thus protecting the circuit device from being damaged owing to the over-load; furthermore, the power supplied to the load can be restarted after the failure is eliminated without replacing the devices such as fuse, etc. used in the prior art.
Description
Technical field
The present invention relates to a kind of circuit arrangement, in particular, relate to a kind of power circuit that makes, avoid circuit arrangement because of overload or the infringement that caused of opening circuit with high power load.
Background technology
In power circuit in the past, especially have the power circuit of high power load, have power circuit as shown in Figure 1 usually.In power circuit in the past shown in Figure 1, comprise two parts, part of shown in Fig. 1 (a), powering and the part of shown in Fig. 1 (b), the startup of power pack being controlled to load (load).
In the power circuit of Fig. 1, AC power supplies 101 is connected with fuse 102, choke 103, and has the PTC element (semistor) 104 that is used to prevent the impulse current that electric current moment increases and with the relay switch 105 of short circuit at PTC element 104 two ends.This relay switch 105 is subjected to the control of the relay 109 of (b) among Fig. 1, and after load starts, (MPU) 110 sends control signal to relay 109 by single-chip microcomputer, 105 adhesives of control relay switch are 104 short circuits of PTC element, thereby through rectifier bridge 106 and by being supplied to load component 108 after electrochemical capacitor 107 filtering.
In above-mentioned power circuit, the fuse 102 that the maximum current selection when considering real work matches.If in case overload or short circuit take place, then electric current increases to the blowout current of fuse 102 in the circuit, and then fuse 102 fusing, thereby the electric current of the circuit of cutting off the electricity supply automatically are to guarantee the safety of power circuit, load and whole electrical equipment.
But; in above-mentioned power circuit in the past; the blowout current of the fuse all steady operation electric current than reality is big; thereby cause the operating current under overload protection electric current and the actual rated condition to differ bigger; very short time internal cutting off power circuit that can not be after overload; and, need to cooperate fixed support when mounted, production cost is provided.In addition, employed in the past fuse is disposable protection component, in case fuse because of overload then must change fuse, makes troubles for the maintenance of electric equipment.
Summary of the invention
The present invention is just for the generation that solves the problem that exists in the above-mentioned power circuit in the past.
Circuit arrangement of the present invention comprises main circuit, above-mentioned main circuit has, the ac power supply terminal that is connected with AC power is accepted load portion and the current control division to controlling to the electric current of above-mentioned load portion supply from above-mentioned AC power from the power supply of above-mentioned AC power; The foregoing circuit device also comprises, the control part that the action of current control division is controlled, with be connected and detect the load cell of the information of current loading state in the above-mentioned main circuit with above-mentioned control part, above-mentioned control part, according to the load condition value that detects by above-mentioned load cell, or the load condition value judged of the information of utilizing above-mentioned load cell to detect, above-mentioned current control division is controlled, so that when electric current reaches the load condition value of regulation in above-mentioned main circuit, cut off power supply to above-mentioned load portion.
Utilize circuit arrangement of the present invention, can utilize above-mentioned control part that the action of above-mentioned current control division is controlled, thereby realize control to the load portion power supply, and when load portion generation current overload or short circuit, utilize the current overload state in the direct or indirect testing circuit of load cell, and in time cut off power supply to load.Wherein so-called load cell can be the device that is set directly at the current detecting that is used for detecting main circuit in the main circuit, or indirect detection goes out the heater element (will be elaborated afterwards) of current overload in the main circuit.
Compare with conventional art, owing to cancelled the fuse that is in series with AC power, therefore, when overload or short circuit take place load portion, cut off after the power supply of load portion, needn't change fuse element and just can after fixing a breakdown, restart power supply load.Saved the cost of electric equipment, the burden of the maintenance that alleviates, and can improve the reliability of circuit arrangement.
In addition, be preferably, above-mentioned current control division has, the impulse current buffer unit, control above-mentioned current control division at above-mentioned control part, when starting the power supply to above-mentioned load portion, the electric current of at first controlling in the above-mentioned main circuit all is supplied to above-mentioned load portion by above-mentioned impulse current buffer unit.Utilize this structure when the power supply that begins load portion, to prevent that impulse current from causing damage to load portion and entire circuit.
In addition, circuit arrangement of the present invention can be preferably, above-mentioned current control division has, the impulse current buffer unit, with first switch portion that is connected on above-mentioned impulse current buffer unit upstream side or downstream and the second switch portion that is in parallel with above-mentioned impulse current buffer unit that is connected in series and above-mentioned first switch portion.When stopping to power to the load, first switch portion and second switch portion are in the state of disconnection.Starting when above-mentioned load portion is powered, above-mentioned control part carries out following control to above-mentioned current control division: at first, make the above-mentioned first switch portion closure; Through after the stipulated time, make above-mentioned second switch portion closure, and above-mentioned first switch portion is disconnected; And, when detecting current overload, above-mentioned first switch portion and above-mentioned second switch portion are disconnected by above-mentioned load cell.In the case, not only can when beginning load portion powered, prevent that impulse current from causing damage to load portion, and can when load reaches overload or short circuit, in time cut off power supply load portion.
In these cases, preferably when starting to described load portion power supply, described control part is controlled, and makes the disconnection of described first switch portion, and the closure with respect to described second switch portion lags behind the stipulated time.Like this, can guarantee in beginning when load portion is powered the stability of circuit arrangement.
In addition, circuit arrangement of the present invention can also be preferably, above-mentioned current control division has, the impulse current buffer unit, the upstream side of above-mentioned impulse current buffer unit that the second switch portion in parallel with above-mentioned impulse current buffer unit and being connected on is connected in parallel and above-mentioned second switch portion or first switch portion in downstream.When stopping to power to the load, first switch portion and second switch portion are in the state of disconnection; Starting when above-mentioned load portion is powered, above-mentioned control part carries out following control to above-mentioned current control division: at first, make the above-mentioned first switch portion closure; Through after the stipulated time, make above-mentioned second switch portion closure, and in the process that powers to the load, keep the closure state of above-mentioned first switch portion and above-mentioned second switch portion; And, when detecting current overload, above-mentioned first switch portion and above-mentioned second switch portion are disconnected by above-mentioned load cell.In the case, can realize and the said structure identical functions.
In addition, in circuit arrangement of the present invention, above-mentioned load cell is preferably the temperature sensor on the heater element that is arranged on described main circuit, for example thermistor etc.; Can also be preferably the temperature protector on the heater element that is installed in above-mentioned main circuit; Can also be preferably the current sensor that is arranged in the main circuit.Utilize above-mentioned load cell rapidly the testing circuit device whether transship, and in time current control division is controlled, to cut off power supply to load portion by control part.
In addition; under the situation as load cell with said temperature transducer and said temperature protector; it is installed on the heater element of main circuit; in main circuit, take place under the situation of load portion overload; the electric current that then flows through above-mentioned heater element increases; whether temperature of heating elements raises, transship thereby can detect electric current indirectly.Heater element as above-mentioned main circuit is preferably as follows: when above-mentioned main circuit is provided with the choking-winding that is in series with above-mentioned AC power, above-mentioned load cell can be installed on the above-mentioned choking-winding; When above-mentioned load portion has compressor, above-mentioned load cell can be installed on the housing of above-mentioned compressor; When described load portion has rectification part, described load cell can be installed on the described rectification part; When living load portion has power transistor, can also be installed on the described power transistor by described load cell.Said temperature transducer or temperature protector can be installed in above-mentioned heater element any one on.
Thereby not only can stably begin to power to the load, prevent the infringement that impulse current brings, can also detect of the power supply of load overload back fast shut-off, and after fixing a breakdown, power to the load once more and do not need circuit arrangement is carried out extra maintenance to load.
Description of drawings
Fig. 1 is the circuit diagram of power circuit in the past.
Fig. 2 is the circuit diagram of the circuit arrangement of first embodiment of the invention.
Fig. 3 is the structural representation of employed temperature protector in the first embodiment.
Fig. 4 is the scheme of installation of employed temperature protector in the first embodiment.
Fig. 5 is the operating state control chart of the circuit arrangement of first execution mode.
Fig. 6 is the Single-chip Controlling flow chart of the circuit arrangement of first execution mode.
Fig. 7 is the circuit diagram of the circuit arrangement of second embodiment of the invention.
Embodiment
Below, in conjunction with the accompanying drawings, circuit arrangement of the present invention is elaborated.
Fig. 2 is the circuit diagram of first execution mode of circuit arrangement of the present invention.In Fig. 2, part same as the prior art is used identical symbol, and the repetitive description thereof will be omitted.
The circuit arrangement of present embodiment is to the power circuit device of electric equipment (load portion) B power supply, as shown in Figure 2, comprises main circuit and control part.Wherein, main circuit comprises, the ac power supply terminal 101A that is connected with interchange (AC) power supply 101, acceptance is from the electric equipment B of the Alternating Current Power Supply of ac power supply terminal 101A, with the current control division C that connects the electric current that is supplied to above-mentioned load portion B is controlled with AC power 101, in addition, be in series with choking-winding 203 by ac power supply terminal 101A and AC power 101.
This current control division C comprises, PTC element (impulse current buffer unit), with first relay switch (first switch portion) 201 of PTC element connected in series and second relay switch (second switch portion) 202 in parallel with above-mentioned first relay switch 201 and PTC element.
In the present embodiment, electric equipment (load portion) B has the rectifier bridge (DB) that is used for rectification, guarantees the electrochemical capacitor 107 and the power transistor 111 of stable output, and load device 108.
In the circuit arrangement of present embodiment, control part D has, the single-chip microcomputer 210 of the operating state of control main circuit, the first control port portA of this single-chip microcomputer 210 and the second control port portB are in series with the first relay control part 211 and the second relay control part 212 respectively.This first relay control part 211 and the second relay control part 212, according to from first control port portA of single-chip microcomputer 210 and the signal of the second control port portB, disconnection, the closure of above-mentioned first relay switch 201 and second relay switch 202 are controlled in linkage respectively.And, be set in the present embodiment, when the signal of the above-mentioned first control port portA and the second control port portB was low level, the first relay control part 211 and the second relay control part 212 control first relay switch 201 respectively and second relay switch 202 is off-state.
In addition, the circuit arrangement of present embodiment also has the temperature protector 213 (load cell E) of lift-launch on above-mentioned choking-winding 203, and this temperature protector 213 is connected with the second relay control part 212.Therefore, the second relay control part 212 is except the control of the second control port portB that is subjected to single-chip microcomputer 210, and the break-make of its circuit also is subjected to the control of this temperature protector 213, thereby can further guarantee the reliability of control action.
Said temperature protector 213 is a kind of of common OLP element; its structure as shown in Figure 3; has bimetal leaf 303; the lead-out wire 307 that is electrically connected by metab 302 with the stiff end of bimetal leaf 303; with the moving contact 304 contacted fixed contacts 305 that are arranged on the bimetal leaf movable end; and the lead-out wire 308 that is electrically connected and leads to the OLP element-external with fixed contact, and, between metab 302 and the metallic plate 306 that is electrically connected lead-out wire 308, also be provided with insulating barrier 301.Under the normal temperature state, because bimetal leaf 303 is in case of bending, moving contact 304 305 is contacted with getting an electric shock surely, so lead-out wire 307,308 is conducting, makes when temperature raises, because if the metal material of forming bimetal leaf 303 is coefficient of expansion difference, make bimetal leaf 304 distortion, thereby moving contact 304 and moving contact 305 are separated, therefore, when reaching set point of temperature, lead-out wire 307,308 becomes and opens circuit.
In the present embodiment, temperature protector 213 is installed on the choking-winding 203, and its structure as shown in Figure 4.Because temperature protector 213 contacts with choking-winding 203; therefore; can detect the variations in temperature of choking-winding 203 rapidly; temperature raises when the electric current in the choking-winding 203 increases; in case surpass the set point of temperature of temperature protector 213; form between the lead-out wire 307,308 of this temperature protector 213 and open circuit, thereby cut off electric current in the second relay control part 212, second relay switch 202 is disconnected.Therefore; can be according to choking-winding 203 real work electric current and heatings; temperature protector 213 is selected; so that the electric current in the choking-winding 203 is when reaching overload current; temperature protector 213 cuts off action; thereby, can make single-chip microcomputer 210 receive this actuating signal, load portion B is taked the control of necessary overload protection.
In the present embodiment, do not use employed fuse in the prior art, therefore, needn't be provided for installing the fixed support of fuse in the circuit board in addition, can realize that cost descends.In addition, can guarantee when load overload or short circuit take place, in time to cut off circuit arrangement, the safety of proof load parts and whole electric equipment.
Below, the action of the circuit arrangement of present embodiment is elaborated.
As shown in Figure 5, be the sequential chart of each element action control of the circuit arrangement of present embodiment.In Fig. 5; the transverse axis express time; on the longitudinal axis; portA, portB represent the control signal level to the first relay control part 211 and 212 outputs of the second relay control part from the first control port portA of single-chip microcomputer 210 and the second control port portB respectively; RY-PWR1 and RY-PWR2 represent the open and-shut mode of first relay switch 201 and second relay switch 202 respectively, and OLP represents temperature protector 213 residing state of temperatures.
As shown in the figure, under holding state (A section in reference to figure), the first control port portA and the second control port portB output low level L, therefore first relay switch 201 and second relay switch 202 (RY-PWR1, RY-PWR2) they are off-state.At t1 constantly the time, if single-chip microcomputer 210 receives the instruction that starts electric equipment, then from first control port portA output high level H control signal, in the first relay control part 211, flow through electric current, make first relay switch (RY-PWR1), 201 closures, thereby circuit arrangement is connected, and beginning is powered to electric equipment B, promptly powers to load component 108 via rectifier bridge 106 and electrochemical capacitor 107.At this moment, in main circuit, electric current is supplied with by PTC element 104, can prevent the infringement that impulse current causes electric equipment B thus.
After the current stabilization in the circuit, at t2 constantly, the second control port portB output high level from single-chip microcomputer 210 flows through electric current via temperature protector 213 in the second relay control part 212, make second relay switch (RY-PWR2), 202 closures.Because first relay switch 201 and PTC element 104 are by 202 short circuits of second relay switch, therefore, electric current is directly supplied with by second relay switch 202.In the present embodiment, the time interval of t1 and t2 is 1 second, still, can be set this time interval arbitrarily as long as guarantee according to the real work situation to the load stable power-supplying.
Then, at t3 constantly, make the level upset of exporting be low level L, control 201 disconnections of first relay switch, thereby finish the startup of electric equipment from the first control port portA of single-chip microcomputer 210.After the startup; in choking-winding 203, flow through electric current; therefore the temperature of choking-winding 203 raises gradually; under the situation of load operate as normal, up to a certain moment t4, the temperature stabilization of choking-winding; but; this temperature is lower than the set point of temperature of temperature protector 213, therefore, can guarantee the stable operation of equipment.In addition, in the present embodiment, the time interval of t2 and t3 is 0.5 second, still, can be set this time interval arbitrarily as long as guarantee according to the real work situation to the load stable power-supplying.And, the time interval that can make t2 and t3 is 0 second, promptly, when making second relay switch, 202 closures, cut off first relay switch 201, but, the viewpoint of collateral security circuit arrangement stable power-supplying considers that the cut-out of preferred first relay switch 201 lags behind the closure of second relay switch 202.
As shown in Figure 5; suppose electric equipment load overload or short circuit to take place constantly at t5; electric current in the circuit arrangement is increased rapidly; thereby the temperature of choking-winding 203 raises rapidly; when constantly at t6; when the temperature of choking-winding 203 surpasses the set point of temperature of temperature protector 213; temperature protector 213 forms and opens circuit; thereupon; be cut off with the electric current in the second relay control part 212 that this temperature protector 213 is connected, second relay switch (RY-PWR2) 202 disconnects, thereby; the power supply of electric equipment is cut off, and protective circuit device and load can not damage because of overload or short circuit.Meanwhile; make the control signal upset of exporting be low level L from the second control port portB of single-chip microcomputer 210; guarantee after the power supply of cutting off circuit arrangement, can be because of choking-winding 203 coolings, temperature protector 213 recloses and powers to the load once more.
After the fault of getting rid of load overload or short circuit, can repeat aforesaid operations continues load is powered, therefore, utilize the circuit arrangement of present embodiment, can guarantee when load overload or short circuit, in time can cut off power supply to load, and, needn't must change fuse and could power to load once more as power circuit in the past, simplify the attended operation of electric equipment greatly, reduce maintenance cost, can guarantee the reliability of circuit arrangement simultaneously again.
In addition, circuit arrangement according to present embodiment, can utilize single-chip microcomputer 210 to carry out following control, promptly, after when load is transshipped, cutting off the power supply of circuit arrangement to load portion B, retry starts, and still is under the situation of overload or short-circuit condition, to the user prompt abnormal information at retry startup stipulated number back loading.
At this, the basic functional principle of circuit arrangement is identical with the action specification of above-mentioned present embodiment, and omits repeated description, and only the flow process that single-chip microcomputer 210 is controlled describes, and flow chart as shown in Figure 6.
After single-chip microcomputer 210 starts (S600), circuit arrangement is carried out initialization (S601), first relay switch 201 and second relay switch 202 all are made as disconnection, to load portion B power supply, be not in the holding state shown in the A section of Fig. 5 this moment.And, the counter N that is used for detection failure is carried out initialization, to N assignment " 0 ".
Receive the instruction (S602) of starting device when single-chip microcomputer 210 after, control first relay switch, 201 closures (with reference to the t1 moment of Fig. 5) and (S603), start power supply load.
After 1 second, single-chip microcomputer 210 controls second relay switch 202 closures (with reference to the t2 moment of Fig. 5) (S604).And when thereafter 0.5 second, make first relay switch 201 disconnect (with reference to the t3 moment of Fig. 5) (S605).Thereby finish the startup of electric equipment, load component 108 is powered by circuit arrangement.
In the process that powers to the load; whether single-chip microcomputer 210 detected temperatures protectors 213 disconnect (S606); in case overload or short circuit take place in load component 108; the electric current that makes choking-winding 203 increases and temperature when surpassing the set point of temperature of temperature protector 213; temperature protector 213 opens circuit; then make the failure of current in the second relay control part 212 of series connection with it; and second relay switch 202 disconnects; circuit arrangement cuts off the power supply to load; simultaneously, single-chip microcomputer 210 carries out with step-length counter N to be 1 counting (S607).
Because considering may be because the temporary load overload that some non-failure factor causes, when judging counter N (S608) less than 3 time, return step S603, repeat above-mentioned steps, with retry to load component 108 power supplies.
Trial failure when continuous 3 times load being powered promptly, begins power supply to load at every turn, and load all is in the state of overload or short circuit, and can't normally move the time, shows fault message (S609) to the user.This fault message can be auditory tone cues, indicator light prompting or picture cues etc.So that the user learn electric equipment hinder for some reason cause the overload or short circuit, thereby can conveniently keep in repair electric equipment.
As mentioned above; just because of adopt the circuit arrangement of above-mentioned present embodiment; replace in the past and to use fuse to protect load not damage in the power circuit because of overload or short circuit; thereby can control by single-chip microcomputer; after taking place once to transship and cutting off power supply to load; repeatedly retry power supply that load is carried out; confirm that thus load is overload or the short circuit that produces owing to fault; thereby; bring convenience to the users; and the cost of the maintenance that reduces greatly, failure judgement reason exactly.
In the above-described embodiment, adopt with first relay switch 201 with after PTC element 104 is connected second relay switch 202 in parallel again, thereby, after making second relay switch, 202 closures, with first relay switch 201 and the short circuit of PTC element, and to the structure of load normal power supply.
But, also can adopt structure as shown in Figure 7.In second embodiment of the invention shown in Figure 7, with different being of above-mentioned first execution mode, replace above-mentioned with the structure of first relay switch 201 with second relay switch 202 in parallel again after PTC element 104 is connected, but adopt first relay switch 301 is series at AC power supplies 101, and with second relay switch 302 after 104 parallel connections of PTC element, the structure of connecting with first relay switch 301, in addition, the structure of the circuit arrangement of second execution mode is identical with first execution mode.
Owing to have different structures with above-mentioned first execution mode in the present embodiment, therefore, carry out the single-chip microcomputer 310 of circuit arrangement control, and under the control of single-chip microcomputer 310, make the sequence of movement of the first relay control part 311 that first relay switch 301 and second relay switch 302 move and the second relay control part 312 different, therefore, distinguish with different symbols.
Utilize said structure, can realize and the above-mentioned first execution mode identical functions.
In the circuit arrangement that utilizes second execution mode carries out control to electric, single-chip microcomputer 310 carries out following control when beginning to power to the load: under the state of the first relay switch portion 301 and 302 disconnections of the second relay switch portion, at first make the first relay switch portion, 301 closures, via PTC element 104 to the load supply capability; Thereby prevent that the impulse current phenomenon from causing damage to load and electric equipment, after the process stipulated time, for example identical with first execution mode, behind 1s, make the second relay switch portion, 302 closures, thereby, directly to the load supply capability, and finish startup via the switch portion of second relay 302 with the short circuit of PTC element.In the process of load stable power-supplying, the first relay switch portion 301 and the second relay switch portion 302 remain closed.
Take place in load under the situation of overload or short circuit; because temperature protector 213 forms and opens circuit; therefore; make the failure of current of the second relay control part 312; and second relay switch 302 is disconnected; simultaneously, single-chip microcomputer 310 sends low level L simultaneously to the first relay control part 311 and the second relay control part 312, cuts off the power supply to load.
And, also can utilize the circuit arrangement of second execution mode to realize in first execution mode, after taking place once to transship and cutting off power supply to load, repeatedly retry power supply that load is carried out again, confirm that thus load is overload or the short circuit that produces owing to fault, thereby, bring convenience to the users, and the cost of the maintenance that reduces greatly, failure judgement reason exactly.
More than, two embodiments of the present invention are had been described in detail, still, the present invention is not limited to the respective embodiments described above, and present technique field staff can carry out multiple modifications and changes on the basis of the above.In the respective embodiments described above, used the structure that temperature protector and the second relay control part are in series, can when load overload or short circuit, cut off power supply at once to load.But; the present invention is not limited thereto; also temperature protector directly can be connected with single-chip microcomputer; and the control part that makes second relay is directly accepted to send control signal by single-chip microcomputer; like this; receive current overload signal from temperature protector when (temperature protector opens circuit) at single-chip microcomputer, transmit control signal simultaneously to the control part of second relay and the control part of first relay by single-chip microcomputer, to cut off power supply to load.In the case, except that the said temperature protector, can also use other all temps transducers, directly receive from signal and definite load of this temperature sensor by single-chip microcomputer and whether transship.
In addition,, be not limited on the choking-winding that is arranged on the respective embodiments described above, also can be arranged on the heater element arbitrarily in the circuit arrangement as temperature sensor.For example, as the heater element in the circuit arrangement, also can be rectifier bridge (DB) etc., and, as Fig. 2 and shown in Figure 7, if the power transistor that has in load portion, or during as the compressor of load elements, can also be with this power transistor, or this compressor is as heater element.By temperature sensor being arranged on the aforesaid heater element; can judge exactly whether load transships; when load overload or short circuit; because the electric current by heater element increases; its temperature is raise; and utilize temperature sensor to detect its variations in temperature and receive signal from temperature sensor by single-chip microcomputer, whether decision circuitry transships quickly and accurately, thus the protection load can not damage because of overload.As temperature sensor, except that can using the said temperature protector, can also use known thermistor etc.
As mentioned above; be by temperature protector being arranged on the heater element of circuit; whether detect electric current indirectly transships; but also can utilize the current sensor that is installed in the main circuit (for example; current transformer etc.); directly the electric current in the testing circuit changes, and utilizes the signal of single-chip microcomputer reception from above-mentioned current sensor, thereby judges whether load transships.
Though below with execution mode the present invention is specified in conjunction with the accompanying drawings, but be appreciated that, above-mentioned explanation does not limit the present invention in any form, and those skilled in the art can be out of shape and change the present invention as required under the situation that does not depart from connotation of the present invention and scope.These distortion and variation all fall within the scope of the present invention.
Claims (12)
1. circuit arrangement is characterized in that:
Described circuit arrangement comprises main circuit, and described main circuit has,
The ac power supply terminal that is connected with AC power,
Acceptance from the load portion of the power supply of described AC power and
To the current control division of controlling to the electric current of described load portion supply from described AC power;
Described circuit arrangement also comprises, the control part that the action of current control division is controlled and is connected and detects the load cell of the information of current loading state in the described main circuit with described control part,
Described control part, according to the load condition value that detects by described load cell, or the load condition value inferred of the information of utilizing described load cell to detect, described current control division is controlled, so that when electric current reaches the load condition value of regulation in described main circuit, cut off power supply to described load portion.
2. circuit arrangement as claimed in claim 1 is characterized in that:
Described current control division has, the impulse current buffer unit,
Described control part is controlled described current control division, and when the power supply that starts described load portion, the electric current of at first controlling in the described main circuit all is supplied to described load portion by described impulse current buffer unit.
3. circuit arrangement as claimed in claim 1 is characterized in that:
Described current control division has, the impulse current buffer unit, with first switch portion that is connected on described impulse current buffer unit upstream side or downstream and the second switch portion that is in parallel with described impulse current buffer unit that is connected in series and described first switch portion;
When stopping to power to the load, first switch portion and second switch portion are in the state of disconnection,
Starting when described load portion is powered, described control part carries out following control to described current control division:
At first, make the described first switch portion closure; Through after the stipulated time, make described second switch portion closure, and described first switch portion is disconnected;
And, when detecting current overload, described first switch portion and described second switch portion are disconnected by described load cell.
4. circuit arrangement as claimed in claim 3 is characterized in that:
When starting to described load portion power supply, described control part is controlled, and makes the disconnection of described first switch portion, and the closure with respect to described second switch portion lags behind the stipulated time.
5. circuit arrangement as claimed in claim 1 is characterized in that:
Described current control division has, impulse current buffer unit, the described impulse current buffer unit that the second switch portion in parallel with described impulse current buffer unit and being connected on is connected in parallel and the upstream side of described second switch portion or first switch portion in downstream;
When stopping to power to the load, first switch portion and second switch portion are in the state of disconnection,
Starting when described load portion is powered, described control part carries out following control to described current control division:
At first, make the described first switch portion closure; Through after the stipulated time, make described second switch portion closure, and in the process that powers to the load, keep the closure state of described first switch portion and described second switch portion;
And, when detecting current overload, described first switch portion and described second switch portion are disconnected by described load cell.
6. circuit arrangement as claimed in claim 1 is characterized in that:
Described load cell is, is installed in the temperature sensor on the heater element of described main circuit.
7. circuit arrangement as claimed in claim 1 is characterized in that:
Described load cell is, is installed in the temperature protector on the heater element of described main circuit.
8. circuit arrangement as claimed in claim 1 is characterized in that:
Described load cell is to be arranged on the current sensor in the described main circuit.
9. as claim 6 or 7 described circuit arrangements, it is characterized in that:
As the heater element of described main circuit, described main circuit is provided with the choking-winding that is in series with described AC power, and described load cell is installed on the described choking-winding.
10. as claim 6 or 7 described circuit arrangements, it is characterized in that:
As the heater element of described main circuit, described load portion has compressor, and described load cell is installed on the housing of described compressor.
11., it is characterized in that as claim 6 or 7 described circuit arrangements:
As the heater element of described main circuit, described load portion has rectification part, and described load cell is installed on the described rectification part.
12., it is characterized in that as claim 6 or 7 described circuit arrangements:
As the heater element of described main circuit, the load portion of living has power transistor, and described load cell is installed on the described power transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710105409XA CN101316039B (en) | 2007-05-30 | 2007-05-30 | Circuit apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710105409XA CN101316039B (en) | 2007-05-30 | 2007-05-30 | Circuit apparatus |
Publications (2)
| Publication Number | Publication Date |
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| CN101316039A true CN101316039A (en) | 2008-12-03 |
| CN101316039B CN101316039B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710105409XA Active CN101316039B (en) | 2007-05-30 | 2007-05-30 | Circuit apparatus |
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| CN (1) | CN101316039B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102960052A (en) * | 2010-06-24 | 2013-03-06 | 熊津豪威株式会社 | Heater including electrical leakage breaker circuit, method of breaking electrical leakage using the same, and bidet including the same |
| TWI488019B (en) * | 2012-03-05 | 2015-06-11 | Panasonic Corp | Two-wire load control device |
| CN104901285A (en) * | 2015-06-09 | 2015-09-09 | 沈阳工业大学 | Thermoelectricity mixing type overload protection system and design method thereof |
| CN104901661A (en) * | 2014-03-07 | 2015-09-09 | 易家居联网科技有限公司 | Power transmission device with overload protection and energy-saving mechanism |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60134781A (en) * | 1983-12-23 | 1985-07-18 | Matsushita Electric Ind Co Ltd | Malfunction detector of air conditioner |
| CN2622843Y (en) * | 2003-05-29 | 2004-06-30 | 王稳忠 | Mains switching modular able to be controlled for automatic a.c. switching off |
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2007
- 2007-05-30 CN CN200710105409XA patent/CN101316039B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102960052A (en) * | 2010-06-24 | 2013-03-06 | 熊津豪威株式会社 | Heater including electrical leakage breaker circuit, method of breaking electrical leakage using the same, and bidet including the same |
| CN102960052B (en) * | 2010-06-24 | 2015-11-25 | 熊津豪威株式会社 | Comprise the heater of residual current circuit breaker circuit, use the method that this residual current circuit breaker circuit makes electric leakage disconnect and the sanitary equipment comprising this heater |
| US9488385B2 (en) | 2010-06-24 | 2016-11-08 | Woongjin Coway Co., Ltd | Heater including electrical leakage breaker circuit, method of breaking electrical leakage using the same, and bidet including the same |
| TWI488019B (en) * | 2012-03-05 | 2015-06-11 | Panasonic Corp | Two-wire load control device |
| CN104901661A (en) * | 2014-03-07 | 2015-09-09 | 易家居联网科技有限公司 | Power transmission device with overload protection and energy-saving mechanism |
| US9720432B2 (en) | 2014-03-07 | 2017-08-01 | Elifeconnection Co., Ltd. | Power transmission apparatus with over-loading protection and power-saving mechanism |
| CN104901661B (en) * | 2014-03-07 | 2017-11-07 | 易家居联网科技有限公司 | Power transmission device with overload protection and energy-saving mechanism |
| CN104901285A (en) * | 2015-06-09 | 2015-09-09 | 沈阳工业大学 | Thermoelectricity mixing type overload protection system and design method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101316039B (en) | 2012-07-25 |
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