CN205377282U - Protection circuit in pure resistive load return circuit - Google Patents
Protection circuit in pure resistive load return circuit Download PDFInfo
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- CN205377282U CN205377282U CN201521104496.3U CN201521104496U CN205377282U CN 205377282 U CN205377282 U CN 205377282U CN 201521104496 U CN201521104496 U CN 201521104496U CN 205377282 U CN205377282 U CN 205377282U
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Abstract
The utility model provides a protection circuit in pure resistive load return circuit, include: DC power supply output circuit links to each other with control and treatment circuit for provide work required power for control and treatment circuit, control and treatment circuit links to each other with contact failure detection circuitry and release drive circuit for receive the contact failure pulse signal that contact failure detection circuitry generated, and control release drive circuit dropout tripping operation, contact failure detection circuitry is provided with current transformer, and current transformer is used for the contact failure characteristic waveform conversion pulse signal with the controlled pure resistive load return circuit that detects. The utility model provides a can't carry out timely effectual processing and the technical problem who has a potential safety hazard that leads to to pure resistive load return circuit contact failure's problem, reached in the pure resistive load return circuit of timely discovery the contact failure problem and to its technological effect of carrying out efficient handling.
Description
Technical field
This utility model relates to circuit protection technical field, in particular to the protection circuit in a kind of pure resistor load loop.
Background technology
At present, in low-voltage electrical field, some have the household electronic products of relatively high power pure resistor load characteristic, for instance: electric cooker, electric heater, electric kettle, electric heater etc., often there is the problem of loose contact to exist between attaching plug and the supply socket of these electrical equipment.If it occur that supply socket loose contact, the lighter's plug slice is overheated to be loosened, and affect normally using of plug and socket, serious, can cause electrical fire, it is possible to can cause immeasurable life and property loss.
Concrete, when there is the problem of loose contact in pure resistor load loop, the contact resistance of loose contact place can become big, cause impedance varying circuit big, loop current is made to diminish, the Voltage Drop of load end, causes pure resistor load operating power to decay, work efficiency drop, affects the normal operation of pure resistor load product.After this point is mainly reflected in the work efficiency drop in pure resistor load loop, working time is elongated, and the working time is elongated, the heating quantitative change making loose contact end is big, occur that carbonization phenomenon provides time conditions for loose contact end, appearance along with carbonization phenomenon, fever phenomenon is also more serious, following carbonization phenomenon is also more serious, the result that the circulation of this continuous badness is gone down is to produce arc current phenomenon, the generation of arc current phenomenon can make again the temperature around loose contact end sharply raise, it is easy to causes fire incident.Experimental data shows, the heating temp that the loose contact of 15A electric current causes is at about 600 DEG C, and the heating temp that 500mA arc current causes can reach 2000 DEG C.
For the problem how solving the loose contact of pure resistor load loop, effective solution is not yet proposed at present.
Utility model content
This utility model embodiment provides the protection circuit in a kind of pure resistor load loop, and to reach the loose contact problem finding in pure resistor load loop in time the technique effect that it is effectively treated, this protection circuit includes:
DC source output circuit, control and treatment circuit, loose contact testing circuit and electrical apparatus release drive circuit, wherein, described DC source output circuit, it is connected with described control and treatment circuit, is used for as the power supply needed for described control and treatment circuit offer work；Described control and treatment circuit, it is connected with described loose contact testing circuit and described electrical apparatus release drive circuit, for receiving the loose contact pulse signal that described loose contact testing circuit generates, and complete, according to the described pulse signal described electrical apparatus release drive circuit of control, tripping operation of threading off；Described loose contact testing circuit, is provided with current transformer, and wherein, the loose contact signature waveform in the described current transformer controlled pure resistor load loop for detecting changes described pulse signal.
In one embodiment, described DC source output circuit includes: the first terminal, first end of described the first terminal connects the N line of alternating current, second end of described the first terminal connects the L line of alternating current, and described L line and described N line are in parallel with MOV, the first resistance R0 and ceramic disc capacitor C0 through described the first terminal；Rectifier bridge BG1, input 1 foot of described rectifier bridge BG1 is by resistance R1 parallel with one another, R_1 and R_2 is connected with described L line, input 2 foot of described rectifier bridge BG1 is connected with described N line, outfan 3 foot of described rectifier bridge BG1 and the positive pole of electrochemical capacitor C1, one end of earth resistance R5, one end of current-limiting resistance R6, one end of current-limiting resistance R7 is connected, the other end of described current-limiting resistance R7 is connected with the negative electrode of stabilivolt D3, outfan 4 foot of described rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of stabilivolt D3, DC earthing end is connected.
In one embodiment, outfan 3 foot of described rectifier bridge BG1 exports+12V power supply to described control and treatment circuit.
In one embodiment, the other end of described current-limiting resistance R6 is connected with the anode of light emitting diode D7, the minus earth of described light emitting diode D7, and described light emitting diode D7 is for the power supply instruction of the protection circuit in pure resistor load loop.
nullIn one embodiment，Described loose contact testing circuit，Including: the second terminal，First end of described second terminal is connected with the first output pin of described current transformer，Second end of described second terminal is connected with the second output pin of described current transformer，First output pin of described current transformer is also connected with one end of resistance R22，The other end of described resistance R22 is connected with the anode of diode D6，The negative electrode of described diode D6 and one end of resistance R17、One end of ceramic disc capacitor C10 and one end of resistance R18 are connected，The other end of described resistance R17 and the other end ground connection of described ceramic disc capacitor C10，The other end of described resistance R18 and the negative electrode of Zener diode D8、One end of resistance R21 and described control and treatment circuit are connected，The anode of described Zener diode D8 and the other end ground connection of described resistance R21，Second end ground connection of described second terminal，Circuit from described resistance R22 to described control and treatment circuit is the testing circuit of the loose contact signature waveform in detection pure resistor load loop.
In one embodiment, the magnetic core that described current transformer is met preset value by permeability is coiled into.
In one embodiment, described electrical apparatus release drive circuit includes: resistance R19, described resistance R19 one end is connected with described control and treatment circuit, the other end is connected with one end controlling pole and flaky electric capacity C13 of controllable silicon BT1, the negative electrode of described controllable silicon BT1 is all connected with zero line with the other end of flaky electric capacity C13, the anode of described controllable silicon BT1 is connected with one end of the breaking coil TKQ of electrical apparatus release, and the other end of the breaking coil TKQ of described electrical apparatus release is connected with electrical apparatus release stationary contact D9.
In one embodiment, the model of the control chip that described control and treatment circuit adopts is MSP430F2012.
In the above-described embodiments, provide one and include DC source output circuit, control and treatment circuit, the protection circuit in the pure resistor load loop of loose contact testing circuit and electrical apparatus release drive circuit, by current transformer, the loose contact signal detected is converted to the pulse signal that the process equipment such as single-chip microcomputer may identify which and process, so that control and treatment circuit can control electrical apparatus release drive circuit based on this pulse signal completes tripping operation of threading off, to protect pure resistor load loop to be unlikely to that damage occurs, thus solving the technical problem of the existence potential safety hazard that the problem of pure resistor load loop loose contact cannot be processed timely and effectively in prior art and cause, the loose contact problem in timely discovery pure resistor load loop the technique effect that it is effectively treated are reached.
Accompanying drawing explanation
The accompanying drawing constituting the part of the application is used for providing being further appreciated by of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the current waveform change when loose contact of the pure resistor load current waveform；
Fig. 2 is the loose contact waveform that the current transformer according to this utility model embodiment is exported by sample circuit；
Fig. 3 is the normal voltage waveform that the same current transformer according to this utility model embodiment is exported by sample circuit；
Fig. 4 is the protection electrical block diagram in the pure resistor load loop according to this utility model embodiment；
Fig. 5 is the circuit diagram of the DC source output circuit according to this utility model embodiment；
Fig. 6 is the circuit diagram of the control and treatment circuit according to this utility model embodiment；
Fig. 7 is the method flow diagram of the mastery routine according to this utility model embodiment；
Fig. 8 is the circuit diagram of the loose contact testing circuit according to this utility model embodiment；
Fig. 9 is the circuit diagram of the electrical apparatus release drive circuit according to this utility model embodiment；
Figure 10 is the guard method flow chart in the pure resistor load loop according to this utility model embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment and accompanying drawing, this utility model is described in further details.At this, exemplary embodiment of the present utility model and explanation thereof are used for explaining this utility model, but are not intended as restriction of the present utility model.
Inventor have found that, pure resistor load current waveform is when loose contact, current waveform change as shown in Figure 1 can be presented, it is coiled into current transformer by the magnetic core of high permeability materials, the loose contact signature waveform of pure resistor load can be converted to the feature of the tractable pulse signal of single-chip microcomputer as shown in Figures 2 and 3, thus the duty in pure resistor load loop is monitored, prevention loop loose contact problem ahead of time, it is illustrated in figure 2 the loose contact waveform that current transformer is exported by sample circuit, it is illustrated in figure 3 the normal voltage waveform that same current transformer is exported by sample circuit.
This utility model embodiment provides the protection circuit in a kind of pure resistor load loop, and as shown in Figure 4, this circuit includes: DC source output circuit 101, control and treatment circuit 102, loose contact testing circuit 103 and electrical apparatus release drive circuit 104, wherein,
DC source output circuit 101, is connected with control and treatment circuit 102, for providing the power supply needed for work for control and treatment circuit 102；
Control and treatment circuit 102, it is connected with loose contact testing circuit 103 and electrical apparatus release drive circuit 104, for receiving the loose contact pulse signal that loose contact testing circuit 103 generates, and complete, according to pulse signal control electrical apparatus release drive circuit 104, tripping operation of threading off；
Loose contact testing circuit 103, is provided with current transformer, wherein, and the loose contact signature waveform conversion pulse signal in the current transformer controlled pure resistor load loop for detecting.
In upper example, provide one and include DC source output circuit, control and treatment circuit, the protection circuit in the pure resistor load loop of loose contact testing circuit and electrical apparatus release drive circuit, by current transformer, the loose contact signal detected is converted to the pulse signal that the process equipment such as single-chip microcomputer may identify which and process, so that control and treatment circuit can control electrical apparatus release drive circuit based on this pulse signal completes tripping operation of threading off, to protect pure resistor load loop to be unlikely to that damage occurs, thus solving the technical problem of the existence potential safety hazard that the problem of pure resistor load loop loose contact cannot be processed timely and effectively in prior art and cause, the loose contact problem in timely discovery pure resistor load loop the technique effect that it is effectively treated are reached.
Below in conjunction with concrete circuit diagram, above-mentioned DC source output circuit 101, control and treatment circuit 102, loose contact testing circuit 103 and electrical apparatus release drive circuit 104 are specifically described, however, it should be noted that, accompanying drawing and following detailed description are merely to be more fully understood that this utility model, it is not intended that improper restriction of the present utility model, when reality realizes, can also carrying out with practical situation as required reasonably improving and adjusting, this is not construed as limiting by the application.
As shown in Figure 5, a kind of circuit diagram of above-mentioned DC source output circuit, this DC source output circuit includes: the first terminal X001, first end 1 of the first terminal X001 connects the N line of alternating current, second end 2 of the first terminal X001 connects the L line of alternating current, wherein, L line and N line are in parallel through the first terminal X001 and MOV, the first resistance R0 and ceramic disc capacitor C0.
Above-mentioned DC source output circuit is additionally provided with rectifier bridge BG1, rectifier bridge BG1 has four pins, wherein there are two inputs (1 foot and 3 feet) and two outfans (2 feet and 4 feet), wherein, input 1 foot is by resistance R1 parallel with one another, R_1 and R_2 and L line is connected, input 2 foot of rectifier bridge BG1 is connected with N line, outfan 3 foot of rectifier bridge BG1 and the positive pole of electrochemical capacitor C1, one end of earth resistance R5, one end of current-limiting resistance R6, one end of current-limiting resistance R7 is connected, the other end of current-limiting resistance R7 is connected with the negative electrode of stabilivolt D3, outfan 4 foot of rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of stabilivolt D3, DC earthing end is connected.
In actually used process, outfan 3 foot of rectifier bridge BG1 can provide the power supply of+12V, the power supply being somebody's turn to do+12V provides+12V power supply principally for MCU (control and treatment circuit 102), concrete, + 12V power supply is connected with 1 foot of Micro-processor MCV through current-limiting resistance R7, provides positive supply VCC for Micro-processor MCV.
Further, consider to arrange a power supply indicator with indicating circuit whether normal operation, a light emitting diode can be connected in circuit, such as, as it is shown in figure 5, the anode of the other end connecting luminous diode D7 of current-limiting resistance R6, power supply is provided for light emitting diode D7, the minus earth of light emitting diode D7, i.e. using this light emitting diode D7 power supply indicator as this device.
The rectifier bridge that above-mentioned rectifier bridge BG1 can select model to be MB6S, it should be noted, however, that the rectifier bridge selecting this model is only a kind of schematic description, it is also possible to adopting the rectifier bridge of other model, this is not construed as limiting by the application.
The control chip (U1) that control and treatment circuit can adopt model to be MSP430F2012, as shown in Figure 6, this chip has 14 pins, and this chip carries out coordinating the protection realizing pure resistor load loop with other circuit.
This control chip U1 can realize following control flow, i.e. mainly includes following subprogram: scheduled duration interrupt response program, A/D conversion routine, calendar subroutine, loose contact protection five parts such as subprogram, mastery routine.
(such as, 200 μ s) interrupt response programs, this program mainly produces a timer interruption at interval of scheduled duration to scheduled duration, in order to reading A/D and change data, the execution step of this scheduled duration interrupt response program may include that
S1:200 μ s interrupt response；
S1:200 μ s interruption times adds 1；
S3:200 μ s interrupt identification puts 1；
S4: open interruption；
S5: return.
A/D conversion routine, mainly realizes A/D conversion, it is possible to comprise the following steps:
S1: enter A/D conversion routine；
S2: sampling channel selects；
S3: start A/D conversion；
S4: wait that A/D converts；
S5: return.
Calendar subroutine, it is possible to comprise the following steps:
S1: be clocked into subprogram；
S2: determine whether 200 μ s interruption times > 4, if it is, perform S3, if it is not, then perform S7；
S3:ms timing adds 1, and 200us interruption times resets, i.e. after 5 times 200us has interrupted, ms timer adds 1, and resets 200us metering；
S4: determine whether that all kinds of timing (time, point, second) is masked as 1, if it is, perform S5, otherwise perform S6；
S5: read all kinds of time status；
S6: determine whether ms timing > 999, if it is, perform S7, otherwise performs S8；
S7: time, minute, second timing；
S8: return.
Loose contact protection subprogram, it is possible to comprise the following steps:
S1: enter loose contact protection subprogram；
S2: 3 seconds enumerators are set；
S3: judge whether that protection occurs by flag bit, if there is, then perform S7, but do not occur, then perform S4；
S4: determine whether 3ms enumerator==0, if it is, perform S8, otherwise perform S5；
S5: if P1.3 detect mouth voltage more than 200mV, then counter cnt 1+1, concrete, if be detected that multiple pulse, then enumerator only adds once, once interrupts, and can only have data, is just pulse more than 200mV.
S6: determine whether P1.3 impulse scaler CNT1 >=4, if it is, perform S7, otherwise perform S8；
S7: electrical apparatus release trip action；
S8: P1.3 impulse scaler CNT1=0 is set；
S9: return.
Mastery routine is exactly the flag bit according to memorizer, judges whether output action, as it is shown in fig. 7, mastery routine may comprise steps of:
S1: enter mastery routine；
S2: initialize；
S3: judge that whether 200us interrupt identification is as 1, if it is, perform S4, otherwise, performs S8；
S4: be clocked into subprogram；
S5:200us interrupt identification resets；
S6:P1.3 samples A/D conversion routine；
S7: enter loose contact protection subprogram；
S8: judge that whether loose contact protective emblem is as 1, if it is, perform S9, otherwise, performs S10；
S9: electrical apparatus release action；
S10: unconditional branch is to S3.
As shown in Figure 8, a kind of circuit diagram for loose contact testing circuit, this loose contact testing circuit includes: the second terminal X003, first end 1 of the second terminal X003 is connected with the first output pin of current transformer, second end 1 of the second terminal X003 is connected with the second output pin of current transformer, that is, the terminal 1,2 of X003 connects and two output pins of the current transformer for loose contact detection respectively.Wherein, first output pin of current transformer is also connected with one end of resistance R22, the other end of resistance R22 is connected with the anode of diode D6, one end of the negative electrode of diode D6 and resistance R17, one end of ceramic disc capacitor C10 and one end of resistance R18 are connected, the other end of resistance R17 and the other end ground connection of ceramic disc capacitor C10, the negative electrode of the other end of resistance R18 and Zener diode D8, one end of resistance R21 and control and treatment circuit are connected, the anode of Zener diode D8 and the other end ground connection of resistance R21, second end 2 ground connection of the second terminal X003, circuit between from resistance R22 to control and treatment circuit is the testing circuit of the loose contact signature waveform in detection pure resistor load loop.Signal processing is that control and treatment circuit 102 is undertaken processing by the logical operations of software.
Wherein, the magnetic core that current transformer is met preset value by permeability is coiled into, i.e. current transformer can be coiled into by the magnetic core of high permeability materials.
As shown in Figure 9, circuit diagram for electrical apparatus release drive circuit, may include that resistance R19, resistance R19 one end is connected with control and treatment circuit (pin 2), the other end is connected with control pole (g pole) and one end of flaky electric capacity C13 of controllable silicon BT1, the negative electrode (k pole) of controllable silicon BT1 is all connected with zero line with the other end of flaky electric capacity C13, the anode (a pole) of controllable silicon BT1 is connected with one end of the breaking coil TKQ of electrical apparatus release, and the other end of the breaking coil TKQ of electrical apparatus release is connected with electrical apparatus release stationary contact D9.When electrical apparatus release movable contact TK_L closes, 2 (the L lines of power supply) of its stationary contact D9 and the terminal X001 of DC source output circuit are connected.
The major function of electrical apparatus release drive circuit is in that, triggering command is gone out by 2 human hair combing wastes of Micro-processor MCV, trigger pip is provided to the control pole (g pole) of controllable silicon BT1 through resistance R19, controllable silicon BT1 triggering and conducting, the circuit loop of the breaking coil TKQ of electrical apparatus release is connected, and has DC current to flow through breaking coil TKQ, electrical apparatus release actuating mechanism action, make electrical apparatus release complete tripping operation of threading off, cut off the load-carrying power supply of electrical apparatus release.
Protection circuit based on above-mentioned pure resistor load loop, it is possible to carry out loop protection in such a way, as shown in Figure 10, comprise the following steps:
Step 1001: the current waveform in pure resistor load loop is converted to pulse signal by current transformer；
Step 1002: determine whether pure resistor load loop comes in contact bad situation according to described pulse signal；
Step 1003: if it is determined that described pure resistor load loop comes in contact bad situation, then cut off described pure resistor load loop.
Existing loose contact overtemperature protection generally can only for protecting concrete region point to lay temperature sensor and protection device; the many point protections of whole load circuit are not as suitable, and protection circuit and the method in the pure resistor load loop that this example provides can cover whole load circuit.
In upper example, utilize pure resistor load current waveform when loose contact, the feature of the current waveform change presented, it is coiled into current transformer by the magnetic core of high permeability materials, it is used for detecting load circuit electric current, the loose contact signature waveform of pure resistor load can be converted to the feature of the tractable pulse signal of single-chip microcomputer by this current transformer, is used for the duty in pure resistor load loop is monitored, in order to the harm that prevention loop loose contact problem is brought ahead of time.
Obviously, those skilled in the art should be understood that, each module of above-mentioned this utility model embodiment the foregoing is only preferred embodiment of the present utility model, it is not limited to this utility model, for a person skilled in the art, this utility model embodiment can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection domain of the present utility model.
Claims (8)
1. the protection circuit in a pure resistor load loop, it is characterised in that including: DC source output circuit, control and treatment circuit, loose contact testing circuit and electrical apparatus release drive circuit, wherein,
Described DC source output circuit, is connected with described control and treatment circuit, is used for as the power supply needed for described control and treatment circuit offer work；
Described control and treatment circuit, it is connected with described loose contact testing circuit and described electrical apparatus release drive circuit, for receiving the loose contact pulse signal that described loose contact testing circuit generates, and complete, according to the described pulse signal described electrical apparatus release drive circuit of control, tripping operation of threading off；
Described loose contact testing circuit, is provided with current transformer, and wherein, the loose contact signature waveform in the described current transformer controlled pure resistor load loop for detecting changes described pulse signal.
2. the protection circuit in pure resistor load loop according to claim 1, it is characterised in that described DC source output circuit includes:
The first terminal, the first end of described the first terminal connects the N line of alternating current, and the second end of described the first terminal connects the L line of alternating current, and described L line and described N line are in parallel with MOV, the first resistance R0 and ceramic disc capacitor C0 through described the first terminal；
Rectifier bridge BG1, input 1 foot of described rectifier bridge BG1 is by resistance R1 parallel with one another, R_1 and R_2 is connected with described L line, input 2 foot of described rectifier bridge BG1 is connected with described N line, outfan 3 foot of described rectifier bridge BG1 and the positive pole of electrochemical capacitor C1, one end of earth resistance R5, one end of current-limiting resistance R6, one end of current-limiting resistance R7 is connected, the other end of described current-limiting resistance R7 is connected with the negative electrode of stabilivolt D3, outfan 4 foot of described rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of stabilivolt D3, DC earthing end is connected.
3. the protection circuit in pure resistor load loop according to claim 2, it is characterised in that outfan 3 foot of described rectifier bridge BG1 exports+12V power supply to described control and treatment circuit.
4. the protection circuit in pure resistor load loop according to claim 2; it is characterized in that; the other end of described current-limiting resistance R6 is connected with the anode of light emitting diode D7; the minus earth of described light emitting diode D7, described light emitting diode D7 is for the power supply instruction of the protection circuit in pure resistor load loop.
5. the protection circuit in pure resistor load loop according to claim 1, it is characterised in that described loose contact testing circuit, including:
nullSecond terminal，First end of described second terminal is connected with the first output pin of described current transformer，Second end of described second terminal is connected with the second output pin of described current transformer，First output pin of described current transformer is also connected with one end of resistance R22，The other end of described resistance R22 is connected with the anode of diode D6，The negative electrode of described diode D6 and one end of resistance R17、One end of ceramic disc capacitor C10 and one end of resistance R18 are connected，The other end of described resistance R17 and the other end ground connection of described ceramic disc capacitor C10，The other end of described resistance R18 and the negative electrode of Zener diode D8、One end of resistance R21 and described control and treatment circuit are connected，The anode of described Zener diode D8 and the other end ground connection of described resistance R21，Second end ground connection of described second terminal，Circuit from described resistance R22 to described control and treatment circuit is the testing circuit of the loose contact signature waveform in detection pure resistor load loop.
6. the protection circuit in pure resistor load loop according to claim 5, it is characterised in that the magnetic core that described current transformer is met preset value by permeability is coiled into.
7. the protection circuit in pure resistor load loop according to claim 1, it is characterised in that described electrical apparatus release drive circuit includes:
Resistance R19, described resistance R19 one end is connected with described control and treatment circuit, the other end is connected with one end controlling pole and flaky electric capacity C13 of controllable silicon BT1, the negative electrode of described controllable silicon BT1 is all connected with zero line with the other end of flaky electric capacity C13, the anode of described controllable silicon BT1 is connected with one end of the breaking coil TKQ of electrical apparatus release, and the other end of the breaking coil TKQ of described electrical apparatus release is connected with electrical apparatus release stationary contact D9.
8. the protection circuit in pure resistor load loop according to any one of claim 1 to 7, it is characterised in that the model of the control chip that described control and treatment circuit adopts is MSP430F2012.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521104496.3U CN205377282U (en) | 2015-12-23 | 2015-12-23 | Protection circuit in pure resistive load return circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521104496.3U CN205377282U (en) | 2015-12-23 | 2015-12-23 | Protection circuit in pure resistive load return circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449661A (en) * | 2015-12-23 | 2016-03-30 | 珠海格力电器股份有限公司 | Protection circuit and method for pure-resistance load loops |
| CN108594031A (en) * | 2017-12-26 | 2018-09-28 | 奥克斯空调股份有限公司 | A kind of detection method and device of electrical equipment electrical power contacts state |
| CN108957219A (en) * | 2018-06-14 | 2018-12-07 | 山东卓尔电气有限公司 | A kind of fuse switch on-line fault monitoring method and device |
-
2015
- 2015-12-23 CN CN201521104496.3U patent/CN205377282U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449661A (en) * | 2015-12-23 | 2016-03-30 | 珠海格力电器股份有限公司 | Protection circuit and method for pure-resistance load loops |
| CN108594031A (en) * | 2017-12-26 | 2018-09-28 | 奥克斯空调股份有限公司 | A kind of detection method and device of electrical equipment electrical power contacts state |
| CN108957219A (en) * | 2018-06-14 | 2018-12-07 | 山东卓尔电气有限公司 | A kind of fuse switch on-line fault monitoring method and device |
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Granted publication date: 20160706 Termination date: 20211223 |
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