CN204615355U - A kind of direct current power electronic switch protective device - Google Patents
A kind of direct current power electronic switch protective device Download PDFInfo
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- CN204615355U CN204615355U CN201520357674.7U CN201520357674U CN204615355U CN 204615355 U CN204615355 U CN 204615355U CN 201520357674 U CN201520357674 U CN 201520357674U CN 204615355 U CN204615355 U CN 204615355U
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Abstract
A kind of direct current power electronic switch protective device, be series between impulse controller and switch device driving set, it comprises: signal condition unit, is used for the signal of received current instrument transformer, gives signal comparing unit again after processing signal; Signal comparing unit, the signal being used for signal condition unit to send here compares with the threshold value preset, and whether detection signal reaches default threshold value; Fault locking output unit, if through signal comparing unit relatively after meet or exceed threshold value; carry out fault locking output by fault locking output unit, the light triggering signal that locking pulse controller sends, the light pulse signal of electronic DC switch driver element stops; Input reset signal until outside and fault-signal elimination, fault locking output unit just can be lifted a blockade; If through signal comparing unit relatively after do not reach default threshold value, fault locking output unit is failure to actuate.The utility model have simple and compact for structure, reliability is high, the advantage such as applied widely.
Description
Technical field
The utility model is mainly concerned with electronic switching device field, refers in particular to a kind of protective device being applicable to direct current power electronic switching device.
Background technology
As shown in Figure 1, in the application of some high power DC electronic switching devices, its impulse controller and switching device (electronic DC switch drive unit) all do not have current-limiting protection device.And in order to realize the operating current Real-Time Monitoring to switching device, an overcurrent protection plate of must connecting between impulse controller and drive unit, in case overcurrent damage or damage switching device.
At present, many technical schemes relating to electronic switch protection are had.In the prior art, all protective devices are all integrated in impulse controller, switch device driving set or the protective device in main circuit.Such as: see Fig. 2, be the theory diagram that overcurrent protection is integrated on impulse controller, impulse controller detects the signal of current transformer, once detect that the situation of overcurrent is blocked immediately to the pulse of drive unit, reaches the object of overcurrent protection.See Fig. 3; it is the integrated theory diagram on the drive means of overcurrent protection; electronic switch drive unit detects the signal on current transformer; once there is the situation shutdown switch device immediately of overcurrent; no matter be whether impulse controller sends out pulse, drive unit also feeds back over current fault signal to impulse controller simultaneously.
Utility model content
The technical problems to be solved in the utility model is just: the technical problem existed for prior art, and the utility model provides a kind of simple and compact for structure, direct current power electronic switch protective device that reliability is high, applied widely.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of direct current power electronic switch protective device, be series between impulse controller and switch device driving set, it comprises:
Signal condition unit, is used for the signal of received current instrument transformer, gives signal comparing unit again after processing signal;
Signal comparing unit, the signal being used for signal condition unit to send here compares with the threshold value preset, and whether detection signal reaches default threshold value;
Fault locking output unit, if through signal comparing unit relatively after meet or exceed threshold value; carry out fault locking output by fault locking output unit, the light triggering signal that locking pulse controller sends, the light pulse signal of electronic DC switch driver element stops; Input reset signal until outside and fault-signal elimination, fault locking output unit just can be lifted a blockade; If through signal comparing unit relatively after do not reach default threshold value, fault locking output unit is failure to actuate.
As further improvement of the utility model: described signal condition unit comprises the I/V change-over circuit, see-saw circuit and the low-pass filter circuit that are connected successively.
As further improvement of the utility model: described signal comparing unit is a threshold value comparison circuit.
As further improvement of the utility model: described fault locking output unit is a fault-signal locking and light pulse signal output circuit, fault-signal becomes the fault-signal of a stable state after lock-in circuit, when only having external reset signal to input low, lock-in circuit exports the trouble-free signal of a stable state; The fault-signal of stable state has the pulse signal of error protection with the pulse signal phase of input and output one.
Compared with prior art, the utility model has the advantage of:
1, direct current power electronic switch protective device of the present utility model, achieves and is not all provided with in the control system of overcurrent protective device, to the defencive function of the overcurrent of DC electronic electronic switching device at impulse controller and driver.Employing devices at full hardware realizes, and do not need the participation of programmable logic device, functional reliability is high.
2, direct current power electronic switch protective device of the present utility model, can increase failure protection function on existing parametric controller, does not need to redesign control circuit.The utility model can on the constant basis of available circuit structure the instrument transformer of compatible disposable type.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of electronic power switch when not arranging current-limiting protection device in prior art.
Fig. 2 is that in prior art, overcurrent protection is integrated in the principle schematic on impulse controller.
Fig. 3 is the integrated principle schematic on the drive means of overcurrent protection in prior art.
Fig. 4 is principle schematic of the present utility model.
Fig. 5 is the circuit theory schematic diagram of the utility model signal condition unit and signal comparing unit in embody rule example.
Fig. 6 is the circuit theory schematic diagram of the utility model fault locking output unit in embody rule example.
Marginal data:
1, signal condition unit; 2, signal comparing unit; 3, fault locking output unit.
Embodiment
Below with reference to Figure of description and specific embodiment, the utility model is described in further details.
Direct current power electronic switch protective device of the present utility model is a protective device being used for being series between impulse controller and switch device driving set.Device of the present utility model is used for the operating current of Real-Time Monitoring switching device, once there is overcurrent condition, blocks the pulse that impulse controller sends immediately, makes switching device be in off state, in case the overcurrent continued causes the damage of switching device.
As shown in Figure 4, direct current power electronic switch protective device of the present utility model comprises:
Signal condition unit 1, is used for the signal of received current instrument transformer, carries out signal amplification, filtering, gives signal comparing unit 2 again after having processed signal;
Signal comparing unit 2, the signal being used for signal condition unit 1 to send here compares with the threshold value preset, and whether detection signal reaches default threshold value;
Fault locking output unit 3, if through signal comparing unit 2 relatively after meet or exceed threshold value; carry out fault locking output by fault locking output unit 3, the light triggering signal that locking pulse controller sends, the light pulse signal of electronic DC switch driver element stops; Input reset signal until outside and fault-signal elimination, fault locking output unit 3 just can be lifted a blockade; If through signal comparing unit 2 relatively after do not reach default threshold value, fault locking output unit 3 is failure to actuate.
Wherein, being used for the current transformer of generation current transducer signal, the electronic DC switch driver element being used for producing electronic DC switch drive singal and impulse controller is external module outside the utility model protective device.
As shown in Figure 5, for the circuit theory schematic diagram of signal condition unit 1 and signal comparing unit 2 in embody rule example, signal condition unit 1 comprises the I/V change-over circuit, see-saw circuit and the low-pass filter circuit that are connected successively, and signal comparing unit 2 is a threshold value comparison circuit.Wherein, N1A constitutes an I/V change-over circuit, and wherein V1 is input surge protection pipe; N1B constitutes a reverse amplification circuit, and because previous stage is also anti-phase output, then this level exports as positive; N1C constitutes a second-order low-pass filter; N2A constitutes a threshold value comparison circuit, and treated current signal is compared with the threshold value of setting, if current value exceedes the threshold value of setting, exports fault-signal (ERR).
As shown in Figure 6, for the circuit theory schematic diagram of fault locking output unit 3 in embody rule example, fault locking output unit 3 is a fault-signal locking and light pulse signal output circuit, fault-signal (ERR) becomes the fault-signal of a stable state after lock-in circuit, when only having external reset signal (XRST) to input low, lock-in circuit exports the trouble-free signal of a stable state.The fault-signal of stable state has the pulse signal (PLS) of error protection with the pulse signal (EN) of input and output one.
Below be only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, not departing from the some improvements and modifications under the utility model principle prerequisite, protection range of the present utility model should be considered as.
Claims (4)
1. a direct current power electronic switch protective device, is characterized in that, be series between impulse controller and switch device driving set, it comprises:
Signal condition unit, is used for the signal of received current instrument transformer, gives signal comparing unit again after processing signal;
Signal comparing unit, the signal being used for signal condition unit to send here compares with the threshold value preset, and whether detection signal reaches default threshold value;
Fault locking output unit, if through signal comparing unit relatively after meet or exceed threshold value; carry out fault locking output by fault locking output unit, the light triggering signal that locking pulse controller sends, the light pulse signal of electronic DC switch driver element stops; Input reset signal until outside and fault-signal elimination, fault locking output unit just can be lifted a blockade; If through signal comparing unit relatively after do not reach default threshold value, fault locking output unit is failure to actuate.
2. direct current power electronic switch protective device according to claim 1, is characterized in that, described signal condition unit comprises the I/V change-over circuit, see-saw circuit and the low-pass filter circuit that are connected successively.
3. direct current power electronic switch protective device according to claim 1, is characterized in that, described signal comparing unit is a threshold value comparison circuit.
4. the direct current power electronic switch protective device according to claim 1 or 2 or 3, it is characterized in that, described fault locking output unit is a fault-signal locking and light pulse signal output circuit, fault-signal becomes the fault-signal of a stable state after lock-in circuit, when only having external reset signal to input low, lock-in circuit exports the trouble-free signal of a stable state; The fault-signal of stable state has the pulse signal of error protection with the pulse signal phase of input and output one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520357674.7U CN204615355U (en) | 2015-05-29 | 2015-05-29 | A kind of direct current power electronic switch protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520357674.7U CN204615355U (en) | 2015-05-29 | 2015-05-29 | A kind of direct current power electronic switch protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204615355U true CN204615355U (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520357674.7U Active CN204615355U (en) | 2015-05-29 | 2015-05-29 | A kind of direct current power electronic switch protective device |
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| Country | Link |
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| CN (1) | CN204615355U (en) |
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2015
- 2015-05-29 CN CN201520357674.7U patent/CN204615355U/en active Active
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