CN101316039B - Circuit apparatus - Google Patents

Circuit apparatus Download PDF

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Publication number
CN101316039B
CN101316039B CN200710105409XA CN200710105409A CN101316039B CN 101316039 B CN101316039 B CN 101316039B CN 200710105409X A CN200710105409X A CN 200710105409XA CN 200710105409 A CN200710105409 A CN 200710105409A CN 101316039 B CN101316039 B CN 101316039B
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load
switch portion
power
current
circuit
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CN101316039A (en
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徐胜江
福西孝浩
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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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

Circuit arrangement
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), supplying power 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 receives 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 causes 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 the matching and fixing 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; 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 is according to the load condition value that is detected 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.
With compared with techniques in the past, 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, fuse element needn't be changed and just power supply can be after fixing a breakdown, restarted 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 through 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 is 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 supplied power, above-mentioned control part is controlled above-mentioned current control division as follows: at first, make above-mentioned first switch portion closed; Through after the stipulated time, make above-mentioned second switch portion closed, and above-mentioned first switch portion is broken off; And, when detecting current overload, above-mentioned first switch portion and above-mentioned second switch portion are broken off by above-mentioned load cell.In the case, not only can when beginning load portion supplied power, 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.
Under above-mentioned situation, preferably when starting to said load portion power supply, said control part is controlled, and makes the disconnection of said first switch portion, and the closure with respect to said second switch portion lags behind the stipulated time.Like this, can guarantee beginning when load portion is supplied power the stability of circuit arrangement.
In addition; Circuit arrangement of the present invention can also be preferably; Above-mentioned current control division has; Impulse current buffer unit, the above-mentioned impulse current buffer unit that the second switch portion parallelly connected with above-mentioned impulse current buffer unit and being connected on is connected in parallel and the upstream side of 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 supplied power, above-mentioned control part is controlled above-mentioned current control division as follows: at first, make above-mentioned first switch portion closed; Through after the stipulated time, make above-mentioned second switch portion closed, 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 broken off 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 said 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 with said temperature transducer and the situation of said temperature protector as load cell; It is installed on the heater element of main circuit, in main circuit, takes 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 following: when above-mentioned main circuit is provided with the choking-winding that is in series with above-mentioned AC power, can above-mentioned load cell be installed on the above-mentioned choking-winding; When above-mentioned load portion has compressor, can above-mentioned load cell be installed on the housing of above-mentioned compressor; When said load portion has rectification part, can said load cell be installed on the said rectification part; When living load portion has power transistor, can also be installed on the said power transistor by said load cell.Can with said temperature transducer or temperature protector 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 need not carry out extra maintenance circuit arrangement 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 accompanying drawing, 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, the part identical with prior art used identical symbol, and omits the explanation of repetition.
The circuit arrangement of this execution mode is the power circuit device to electric equipment (load portion) B power supply, and is as shown in Figure 2, comprises main circuit and control part.Wherein, Main circuit comprises; With the ac power supply terminal 101A that interchange (AC) power supply 101 is connected, acceptance is from the electric equipment B of the Alternating Current Power Supply of ac power supply terminal 101A and 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 through 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 parallelly connected with above-mentioned first relay switch 201 and PTC element.
In this execution mode, electric equipment (load portion) B has the rectifier bridge (DB) that is used for rectification, guarantees the electrochemical capacitor 107 and power transistor 111 of stable output, and load device 108.
In the circuit arrangement of this execution mode; 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 with linking respectively.And; In this execution mode, be set at; 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 this execution mode 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 receives single-chip microcomputer 210, and the break-make of its circuit also receives 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 is as shown in Figure 3, has bimetal leaf 303, the lead-out wire 307 that is electrically connected through 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 that is electrically connected lead-out wire 308 306, also be provided with insulating barrier 301.Under the normal temperature state,, moving contact 304 305 is contacted with getting an electric shock surely because bimetal leaf 303 is in case of bending; Therefore lead-out wire 307,308 is conducting, makes when temperature raises, owing to form the metal material of bimetal leaf 303 if the coefficient of expansion is different; 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 this execution mode, temperature protector 213 is installed on the choking-winding 203, and its structure is 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; The lead-out wire 307 of this temperature protector 213, form between 308 and open circuit, thereby cut off the electric current in the second relay control part 212, second relay switch 202 is broken off.Therefore; Can temperature protector 213 be selected according to choking-winding 203 real work electric current and heatings, 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 this execution mode, 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 this execution mode is elaborated.
As shown in Figure 5, be the sequential chart of each element action control of the circuit arrangement of this execution mode.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, and RY-PWR1 and RY-PWR2 represent the open and-shut mode of first relay switch 201 and second relay switch 202 respectively, and OLP representes temperature protector 213 residing state of temperatures.
As shown in the figure, under holding state (with reference to A section among the 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, in the first relay control part 211, flow through electric current from first control port portA output high level H control signal; Make first relay switch (RY-PWR1), 201 closures; Thereby circuit arrangement is connected, begun to supply power, promptly supply power to load component 108 via rectifier bridge 106 and electrochemical capacitor 107 to electric equipment B.At this moment, in main circuit, electric current is supplied with through 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 this execution mode, the time interval of t1 and t2 is 1 second, still, as long as guarantee to the load stable power-supplying, can should the time interval according to any setting of real work situation.
Then, at t3 constantly, make the level upset of exporting be low level L, control 201 disconnections of first relay switch, thereby accomplish 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, so 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 this execution mode, the time interval of t2 and t3 is 0.5 second, still, as long as guarantee to the load stable power-supplying, can should the time interval according to any setting of real work situation.And; The time interval that can make t2 and t3 is 0 second; That is, when making second relay switch, 202 closures, cut off first relay switch 201, still; 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, the electric current in the circuit arrangement is increased rapidly; Thereby the temperature of choking-winding 203 raises rapidly, when at t6 constantly, when the temperature of choking-winding 203 surpasses the set point of temperature of temperature protector 213; Temperature protector 213 forms and opens circuit, and, is cut off with electric current in the second relay control part 212 that this temperature protector 213 is connected thereupon; Second relay switch (RY-PWR2) 202 breaks off; Thereby, the power supply of electric equipment is cut off, 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 and continue load is supplied power, therefore; Utilize the circuit arrangement of this execution mode, 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 supply power to load once more like 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; According to the circuit arrangement of this execution mode, can utilize single-chip microcomputer 210 to control as follows, 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 execution mode, and omits repeated description, and the flow process of only single-chip microcomputer 210 being controlled describes, and flow chart is 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 break off (with reference to the t3 moment of Fig. 5) (S605).Thereby accomplish the startup of electric equipment, load component 108 is supplied power by circuit arrangement.
In the process that powers to the load; Whether single-chip microcomputer 210 detected temperatures protectors 213 break off (S606), in case overload or short circuits take place for 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 breaks off, 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 maybe 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 supplied power 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.Cause overload or short circuit so that the user learns the electric equipment failover, thereby can conveniently keep in repair electric equipment.
As stated, just because of adopt the circuit arrangement of above-mentioned execution mode, 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 the power supply to load, repeatedly retry power supply that load is carried out confirms 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 parallelly connected again second relay switch 202; 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 parallelly connected again second relay switch 202 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 in this execution mode, have various structure with above-mentioned first execution mode; 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.
Carry out in the control to electric at the circuit arrangement that utilizes second execution mode; Single-chip microcomputer 310 is controlled as follows 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; Through after the 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 accomplish and start 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, and therefore, makes the failure of current of the second relay control part 312; And second relay switch 302 is broken off; 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 generation is once transshipped and cut off the 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 specified, still, the present invention is not limited to above-mentioned each execution mode, and present technique field staff can carry out multiple change and change on the basis of the above.In above-mentioned each execution mode, 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 can temperature protector directly be connected with single-chip microcomputer, and make the control part of second relay directly accept 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 above-mentioned each execution mode, 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, like 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.Through temperature sensor being arranged on the aforesaid heater element; Can judge exactly whether load transships, when load overload or short circuit, owing to increase through the electric current of heater element; Its temperature is raise; And utilize temperature sensor its variations in temperature of detection and receive the 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 stated; Be through temperature protector being arranged on the heater element of circuit, detecting electric current indirectly and whether transship, 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 single-chip microcomputer to receive the signal from above-mentioned current sensor, thereby judges whether load transships.
Though more than combine accompanying drawing and execution mode that the present invention is specified; 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 in the scope of the present invention.

Claims (12)

1. circuit arrangement is characterized in that:
Said circuit arrangement comprises main circuit, and said main circuit has,
The ac power supply terminal that is connected with AC power,
Acceptance from the load portion of the power supply of said AC power and
To the current control division of controlling to the electric current of said load portion supply from said AC power;
Said 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 said main circuit with said control part,
Said control part, according to the load condition value that detects by said load cell, or the load condition value inferred of the information of utilizing said load cell to detect; Said current control division is controlled; So that when electric current reaches the load condition value of regulation in said main circuit, cut off power supply to said load portion, after the power supply of cutting off said load; The cut reason of power supply is judged in repeatedly retry power supply that said load is carried out thus.
2. circuit arrangement as claimed in claim 1 is characterized in that:
Said current control division has, the impulse current buffer unit,
Said control part is controlled said current control division, and when the power supply that starts said load portion, the electric current of at first controlling in the said main circuit all is supplied to said load portion through said impulse current buffer unit.
3. circuit arrangement as claimed in claim 1 is characterized in that:
Said current control division has; The impulse current buffer unit; With first switch portion that is connected on said impulse current buffer unit upstream side or downstream and the second switch portion that is in parallel with said impulse current buffer unit that is connected in series and said 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 said load portion is supplied power, said control part is controlled said current control division as follows:
At first, make said first switch portion closed; Through after the stipulated time, make said second switch portion closed, and said first switch portion is broken off;
And, when detecting current overload, said first switch portion and said second switch portion are broken off by said load cell.
4. circuit arrangement as claimed in claim 3 is characterized in that:
When starting to said load portion power supply, said control part is controlled, and makes the disconnection of said first switch portion, and the closure with respect to said second switch portion lags behind the stipulated time.
5. circuit arrangement as claimed in claim 1 is characterized in that:
Said current control division has, impulse current buffer unit, the said impulse current buffer unit that the second switch portion parallelly connected with said impulse current buffer unit and being connected on is connected in parallel and the upstream side of said 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 said load portion is supplied power, said control part is controlled said current control division as follows:
At first, make said first switch portion closed; Through after the stipulated time, make said second switch portion closed, and in the process that powers to the load, keep the closure state of said first switch portion and said second switch portion;
And, when detecting current overload, said first switch portion and said second switch portion are broken off by said load cell.
6. circuit arrangement as claimed in claim 1 is characterized in that:
Said load cell does, is installed in the temperature sensor on the heater element of said main circuit.
7. circuit arrangement as claimed in claim 1 is characterized in that:
Said load cell does, is installed in the temperature protector on the heater element of said main circuit.
8. circuit arrangement as claimed in claim 1 is characterized in that:
Said load cell is to be arranged on the current sensor in the said main circuit.
9. like claim 6 or 7 described circuit arrangements, it is characterized in that:
As the heater element of said main circuit, said main circuit is provided with the choking-winding that is in series with said AC power, and said load cell is installed on the said choking-winding.
10. like claim 6 or 7 described circuit arrangements, it is characterized in that:
As the heater element of said main circuit, said load portion has compressor, and said load cell is installed on the housing of said compressor.
11., it is characterized in that like claim 6 or 7 described circuit arrangements:
As the heater element of said main circuit, said load portion has rectification part, and said load cell is installed on the said rectification part.
12., it is characterized in that like claim 6 or 7 described circuit arrangements:
As the heater element of said main circuit, said load portion has power transistor, and said load cell is installed on the said power transistor.
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KR101275369B1 (en) 2010-06-24 2013-06-17 코웨이 주식회사 Heater including electric leakage break circuit and method of breaking electric leakage of the same, bidet including the same
JP5903673B2 (en) * 2012-03-05 2016-04-13 パナソニックIpマネジメント株式会社 Two-wire load control device
TWI527373B (en) 2014-03-07 2016-03-21 易家居聯網科技有限公司 Power transmission apparatus with over-loading protection and power-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

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