CN105449661A - Protection circuit and method for pure-resistance load loops - Google Patents
Protection circuit and method for pure-resistance load loops Download PDFInfo
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- CN105449661A CN105449661A CN201510997001.2A CN201510997001A CN105449661A CN 105449661 A CN105449661 A CN 105449661A CN 201510997001 A CN201510997001 A CN 201510997001A CN 105449661 A CN105449661 A CN 105449661A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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Abstract
The invention provides a protection circuit and method for pure-resistance load loops. The protection circuit for the pure-resistance load loops comprises a DC power output circuit, a processing control circuit and a bad contact detection circuit, wherein the DC power output circuit is connected with the processing control circuit and is used for providing work required power for the processing control circuit; the processing control circuit is connected with the bad contact detection circuit and a tripper driving circuit and is used for receiving bad contact pulse signals generated by the bad contact detection circuit and controlling the tripper driving circuit to trip; the bad contact detection circuit is provided with a current transformer; and the current transformer is used for transforming the detected bad contact characteristic waveforms of controlled pure-resistance load loops into pulse signals. According to the protection circuit and method for pure-resistance load loops, the technical problem of potential safety hazards caused by not timely and effectively processing the bad contact problems of the pure-resistance load loops is solved, and the technical effect of timely finding and effectively processing the bad contact problems of the pure-resistance load loops is achieved.
Description
Technical field
The present invention relates to circuit protection technical field, in particular to a kind of protective circuit and method 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, such as: electric cooker, electric heater, electric kettle, electric heater etc., often have the problem of loose contact to exist between the attaching plug of these electrical equipment and supply socket.If there occurs supply socket loose contact, the lighter's plug slice is overheated to be loosened, and affects the normal use of plug and socket, serious, can cause electrical fire, may 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 large, cause impedance varying circuit large, loop current is diminished, the Voltage Drop of load end, cause pure resistor load operating power to decay, work efficiency drop, affects the normal work of pure resistor load product.After this point is mainly reflected in the work efficiency drop in pure resistor load loop, operating time is elongated, and the operating time is elongated, make the heating quantitative change of loose contact end large, for loose contact end occurs that carbonization phenomenon provides time conditions, along with the appearance of carbonization phenomenon, fever phenomenon is also more serious, following carbonization phenomenon is also more serious, this continuous badness result of going down that circulates is generation current arc phenomenon, the generation of arc current phenomenon can make again the temperature around loose contact end sharply raise, and easily causes fire incident.Experimental data shows, and 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, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of protective circuit of pure resistor load loop, to reach loose contact problem in Timeliness coverage pure resistor load loop and it to be carried out to the technique effect of effectively process, this protective circuit comprises:
DC power supply output circuit, control and treatment circuit, loose contact testing circuit and release drive circuit, wherein, described DC power supply output circuit, is connected with described control and treatment circuit, for providing the power supply needed for work for described control and treatment circuit; Described control and treatment circuit, be connected with described release drive circuit with described loose contact testing circuit, for receiving the loose contact pulse signal that described loose contact testing circuit generates, and according to described pulse signal control described release drive circuit complete thread off tripping operation; Described loose contact testing circuit, is provided with current transformer, and wherein, described current transformer is used for the loose contact signature waveform in the controlled pure resistor load loop detected to change described pulse signal.
In one embodiment, described DC power supply output circuit comprises: the first terminal, the 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, described L line and described N line in parallel with MOV, the first resistance R0 and ceramic disc capacitor C0 through described the first terminal, rectifier bridge BG1, input 1 pin of described rectifier bridge BG1 is by resistance R1 parallel with one another, R_1 with R_2 is connected with described L line, input 2 pin of described rectifier bridge BG1 is connected with described N line, output 3 pin 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 voltage-stabiliser tube D3, output 4 pin of described rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of voltage-stabiliser tube D3, DC earthing end is connected.
In one embodiment, output 3 pin 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 used for the power supply instruction of the protective circuit in pure resistor load loop.
In one embodiment, described loose contact testing circuit, comprise: the second terminal, the 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 voltage stabilizing didoe D8, one end of resistance R21 and described control and treatment circuit are connected, the anode of described voltage stabilizing didoe 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 detecting pure resistor load loop.
In one embodiment, the magnetic core that described current transformer meets preset value by permeability is coiled into.
In one embodiment, described release drive circuit comprises: resistance R19, described resistance R19 one end is connected with described control and treatment circuit, the other end is connected with the control pole of controllable silicon BT1 and one end of flaky electric capacity C13, 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 release, and the other end of the breaking coil TKQ of described release is connected with release fixed contact D9.
In one embodiment, the model of the control chip of described control and treatment circuit employing is MSP430F2012.
The embodiment of the present invention additionally provides a kind of guard method of pure resistor load loop, and to reach loose contact problem in Timeliness coverage pure resistor load loop and it to be carried out to the technique effect of effectively process, this guard method comprises:
The current waveform in pure resistor load loop is converted to pulse signal by current transformer; Determine whether described pure resistor load loop comes in contact bad situation according to described pulse signal; If determine that described pure resistor load loop comes in contact bad situation, then cut off described pure resistor load loop.
In the above-described embodiments, provide one and include DC power supply output circuit, control and treatment circuit, the protective circuit in the pure resistor load loop of loose contact testing circuit and release drive circuit, the loose contact signal detected is converted to by current transformer the pulse signal that the treatment facilities such as single-chip microcomputer can identify and process, thus make control and treatment circuit can complete based on this pulse signal control release drive circuit tripping operation of threading off, to protect pure resistor load loop to be unlikely to occur damaging, thus solve and cannot process timely and effectively the problem of pure resistor load loop loose contact in prior art and the technical problem that there is potential safety hazard caused, reach the loose contact problem in Timeliness coverage pure resistor load loop and effective technique effect processed is carried out to it.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the current waveform change of pure resistor load current waveform under the state of loose contact;
Fig. 2 is the loose contact waveform exported by sample circuit according to the current transformer of the embodiment of the present invention;
Fig. 3 is the normal voltage waveform exported by sample circuit according to the same current transformer of the embodiment of the present invention;
Fig. 4 is the protective circuit structural representation in the pure resistor load loop according to the embodiment of the present invention;
Fig. 5 is the circuit diagram of the DC power supply output circuit according to the embodiment of the present invention;
Fig. 6 is the circuit diagram of the control and treatment circuit according to the embodiment of the present invention;
Fig. 7 is the method flow diagram of the main program according to the embodiment of the present invention;
Fig. 8 is the circuit diagram of the loose contact testing circuit according to the embodiment of the present invention;
Fig. 9 is the circuit diagram of the release drive circuit according to the embodiment of the present invention;
Figure 10 is the guard method flow chart in the pure resistor load loop according to the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with execution mode and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
Inventor finds, pure resistor load current waveform is under the state of loose contact, current waveform change as shown in Figure 1 can be presented, current transformer is coiled into 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 operating state in pure resistor load loop is monitored, the problem of prevention loop loose contact ahead of time, be illustrated in figure 2 the loose contact waveform that current transformer is exported by sample circuit, be illustrated in figure 3 the normal voltage waveform that same current transformer is exported by sample circuit.
Embodiments provide a kind of protective circuit of pure resistor load loop, as shown in Figure 4, this circuit comprises: DC power supply output circuit 101, control and treatment circuit 102, loose contact testing circuit 103 and release drive circuit 104, wherein,
DC power supply 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, be connected with release drive circuit 104 with loose contact testing circuit 103, for receiving the loose contact pulse signal that loose contact testing circuit 103 generates, and complete according to pulse signal control release drive circuit 104 tripping operation of threading off;
Loose contact testing circuit 103, is provided with current transformer, and wherein, current transformer is used for the loose contact signature waveform commutation pulse signal in the controlled pure resistor load loop detected.
In upper example, provide one and include DC power supply output circuit, control and treatment circuit, the protective circuit in the pure resistor load loop of loose contact testing circuit and release drive circuit, the loose contact signal detected is converted to by current transformer the pulse signal that the treatment facilities such as single-chip microcomputer can identify and process, thus make control and treatment circuit can complete based on this pulse signal control release drive circuit tripping operation of threading off, to protect pure resistor load loop to be unlikely to occur damaging, thus solve and cannot process timely and effectively the problem of pure resistor load loop loose contact in prior art and the technical problem that there is potential safety hazard caused, reach the loose contact problem in Timeliness coverage pure resistor load loop and effective technique effect processed is carried out to it.
Below in conjunction with concrete circuit diagram, above-mentioned DC power supply output circuit 101, control and treatment circuit 102, loose contact testing circuit 103 and release drive circuit 104 are specifically described, but it should be noted that, accompanying drawing and illustrating hereafter are only to understand the present invention better, do not form inappropriate limitation of the present invention, when reality realizes, also can reasonably improve with actual conditions as required and adjust, the application be not construed as limiting this.
As shown in Figure 5, a kind of circuit diagram of above-mentioned DC power supply output circuit, this DC power supply output circuit comprises: the first terminal X001, the 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 through the first terminal X001 and MOV, the first resistance R0 and ceramic disc capacitor C0 parallel connection.
Rectifier bridge BG1 is also provided with in above-mentioned DC power supply output circuit, rectifier bridge BG1 has four pins, wherein there are two inputs (1 pin and 3 pin) and two outputs (2 pin and 4 pin), wherein, input 1 pin is by resistance R1 parallel with one another, R_1 is connected with R_2 and L line, input 2 pin of rectifier bridge BG1 is connected with N line, output 3 pin 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 voltage-stabiliser tube D3, output 4 pin of rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of voltage-stabiliser tube D3, DC earthing end is connected.
In the process that reality uses, output 3 pin of rectifier bridge BG1 can provide the power supply of+12V, the power supply being somebody's turn to do+12V mainly provides+12V power supply for MCU (control and treatment circuit 102), concrete, + 12V power supply is connected with 1 pin of Micro-processor MCV through current-limiting resistance R7, for Micro-processor MCV provides positive supply VCC.
Further, consider whether can arrange a power supply indicator normally works with indicating circuit, a light-emitting diode can be connected in circuit, such as, as shown in Figure 5, the anode of the other end connecting luminous diode D7 of current-limiting resistance R6, for light-emitting diode D7 provides power supply, the minus earth of light-emitting diode D7, that is, using the power supply indicator of this light-emitting diode D7 as this device.
Above-mentioned rectifier bridge BG1 can select model to be the rectifier bridge of MB6S, but it should be noted that and select the rectifier bridge of this model to be only a kind of schematic description, can also adopt the rectifier bridge of other model, the application is not construed as limiting this.
Control and treatment circuit can adopt model to be the control chip (U1) of MSP430F2012, and as shown in Figure 6, this chip has 14 pins, and this chip and other circuit carry out coordinating the protection realizing pure resistor load loop.
This control chip U1 can realize following control flow, that is, mainly comprise following subprogram: scheduled duration interrupt response program, A/D conversion routine, calendar subroutine, five parts such as loose contact protection subprogram, main program etc.
Scheduled duration (such as, 200 μ s) interrupt response program, this program mainly produces a timer interruption at interval of scheduled duration, to read A/D translation data, the execution step of this scheduled duration interrupt response program can comprise:
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, can comprise the following steps:
S1: enter A/D conversion routine;
S2: sampling channel is selected;
S3: start A/D conversion;
S4: wait for that A/D converts;
S5: return.
Calendar subroutine, can comprise the following steps:
S1: enter calendar subroutine;
S2: determine whether 200 μ s interruption times >4, if so, then perform S3, if not, then perform S7;
S3:ms timing adds 1,200us interruption times and resets, that is, after 5 200us have 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 so, then perform S5, otherwise perform S6;
S5: read all kinds of time status;
S6: determine whether ms timing >999, if so, then perform S7, otherwise perform S8;
S7: time, minute, second timing;
S8: return.
Loose contact protection subprogram, can comprise the following steps:
S1: enter loose contact protection subprogram;
S2: 3 seconds counters are set;
S3: judge whether to occur protection by flag bit, if there is, then perform S7, but do not occur, then perform S4;
S4: determine whether 3ms counter==0, if so, then performs S8, otherwise performs S5;
S5: if P1.3 detect mouth voltage be greater than 200mV, then counter cnt 1+1, concrete, if multiple pulse detected, then counter only adds once, once interrupts, and can only have data, and being greater than 200mV is just pulse.
S6: determine whether P1.3 pulse counter CNT1>=4, if so, then perform S7, otherwise perform S8;
S7: release trip action;
S8: P1.3 pulse counter CNT1=0 is set;
S9: return.
Main program is exactly the flag bit according to memory, judges whether output action, and as shown in Figure 7, main program can comprise the following steps:
S1: enter main program;
S2: initialization;
S3: judge that whether 200us interrupt identification is as 1, if so, then performs S4, otherwise, perform S8;
S4: enter calendar subroutine;
S5:200us interrupt identification resets;
S6:P1.3 sampling A/D conversion routine;
S7: enter loose contact protection subprogram;
S8: judge that whether loose contact protective emblem is as 1, if so, then performs S9, otherwise, perform S10;
S9: release action;
S10: unconditional branch is to S3.
As shown in Figure 8, for a kind of circuit diagram of loose contact testing circuit, this loose contact testing circuit comprises: the second terminal X003, the 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 two output pins with the current transformer detected for loose contact 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, the negative electrode of 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 resistance R17 and the other end ground connection of ceramic disc capacitor C10, the other end of resistance R18 and the negative electrode of voltage stabilizing didoe D8, one end of resistance R21 and control and treatment circuit are connected, the anode of voltage stabilizing didoe D8 and the other end ground connection of resistance R21, second end 2 ground connection of the second terminal X003, circuit from resistance R22 to control and treatment circuit is the testing circuit of the loose contact signature waveform detecting pure resistor load loop.Signal transacting is that control and treatment circuit 102 is undertaken processing by the logical operation of software.
Wherein, the magnetic core that current transformer meets preset value by permeability is coiled into, that is, current transformer can be coiled into by the magnetic core of high permeability materials.
As shown in Figure 9, for the circuit diagram of release drive circuit, can comprise: resistance R19, resistance R19 one end is connected with control and treatment circuit (pin 2), control pole (g pole) and one end of flaky electric capacity C13 of the other end and controllable silicon BT1 are connected, 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 release, and the other end of the breaking coil TKQ of release is connected with release fixed contact D9.When release moving contact TK_L closes, its fixed contact D9 is connected with 2 (the L lines of power supply) of the terminal X001 of DC power supply output circuit.
The major function of release drive circuit is, triggering command is gone out by 2 human hair combing wastes of Micro-processor MCV, trigger pip is provided to the control pole of controllable silicon BT1 (g pole) through resistance R19, controllable silicon BT1 triggering and conducting, the circuit loop of the breaking coil TKQ of release is connected, and has direct current to flow through breaking coil TKQ, the action of release actuating mechanism, make release complete tripping operation of threading off, cut off the load-carrying power supply of release.
Additionally provide a kind of guard method of pure resistor load loop in this example, 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: whether come in contact bad situation according to described pulse signal determination pure resistor load loop;
Step 1003: if determine 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 lay temperature sensor and protection device for the concrete region point of protection; be not very suitable to the protection of whole load circuit multiple spot, protective 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 under the state of loose contact, the feature of the current waveform change presented, current transformer is coiled into by the magnetic core of high permeability materials, be 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 monitoring the operating state in pure resistor load loop, so that the harm that the problem of prevention loop loose contact is ahead of time brought.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the protective circuit in pure resistor load loop, is characterized in that, comprising: DC power supply output circuit, control and treatment circuit, loose contact testing circuit and release drive circuit, wherein,
Described DC power supply output circuit, is connected with described control and treatment circuit, for providing the power supply needed for work for described control and treatment circuit;
Described control and treatment circuit, be connected with described release drive circuit with described loose contact testing circuit, for receiving the loose contact pulse signal that described loose contact testing circuit generates, and according to described pulse signal control described release drive circuit complete thread off tripping operation;
Described loose contact testing circuit, is provided with current transformer, and wherein, described current transformer is used for the loose contact signature waveform in the controlled pure resistor load loop detected to change described pulse signal.
2. the protective circuit in pure resistor load loop according to claim 1, is characterized in that, described DC power supply output circuit comprises:
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, described L line and described N line in parallel with MOV, the first resistance R0 and ceramic disc capacitor C0 through described the first terminal;
Rectifier bridge BG1, input 1 pin of described rectifier bridge BG1 is by resistance R1 parallel with one another, R_1 with R_2 is connected with described L line, input 2 pin of described rectifier bridge BG1 is connected with described N line, output 3 pin 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 voltage-stabiliser tube D3, output 4 pin of described rectifier bridge BG1 and the negative pole of electrochemical capacitor C1, the other end of earth resistance R5, the anode of voltage-stabiliser tube D3, DC earthing end is connected.
3. the protective circuit in pure resistor load loop according to claim 2, is characterized in that, output 3 pin of described rectifier bridge BG1 exports+12V power supply to described control and treatment circuit.
4. the protective 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 used for the power supply instruction of the protective circuit in pure resistor load loop.
5. the protective circuit in pure resistor load loop according to claim 1, is characterized in that, described loose contact testing circuit, comprising:
Second terminal, the 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 voltage stabilizing didoe D8, one end of resistance R21 and described control and treatment circuit are connected, the anode of described voltage stabilizing didoe 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 detecting pure resistor load loop.
6. the protective circuit in pure resistor load loop according to claim 5, is characterized in that, the magnetic core that described current transformer meets preset value by permeability is coiled into.
7. the protective circuit in pure resistor load loop according to claim 1, is characterized in that, described release drive circuit comprises:
Resistance R19, described resistance R19 one end is connected with described control and treatment circuit, the other end is connected with the control pole of controllable silicon BT1 and one end of flaky electric capacity C13, 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 release, and the other end of the breaking coil TKQ of described release is connected with release fixed contact D9.
8. the protective circuit in pure resistor load loop according to any one of claim 1 to 7, is characterized in that, the model of the control chip that described control and treatment circuit adopts is MSP430F2012.
9. the guard method in pure resistor load loop, is characterized in that, comprising:
The current waveform in pure resistor load loop is converted to pulse signal by current transformer;
Determine whether described pure resistor load loop comes in contact bad situation according to described pulse signal;
If determine that described pure resistor load loop comes in contact bad situation, then cut off described pure resistor load loop.
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| CN201510997001.2A CN105449661A (en) | 2015-12-23 | 2015-12-23 | Protection circuit and method for pure-resistance load loops |
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| CN201510997001.2A CN105449661A (en) | 2015-12-23 | 2015-12-23 | Protection circuit and method for pure-resistance load loops |
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Application publication date: 20160330 |