CN209419205U - Improve the short-circuit protection circuit and short circuit protection system of discrimination - Google Patents
Improve the short-circuit protection circuit and short circuit protection system of discrimination Download PDFInfo
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- CN209419205U CN209419205U CN201822254462.2U CN201822254462U CN209419205U CN 209419205 U CN209419205 U CN 209419205U CN 201822254462 U CN201822254462 U CN 201822254462U CN 209419205 U CN209419205 U CN 209419205U
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Abstract
The utility model discloses a kind of short-circuit protection circuit and short circuit protection system for improving discrimination; including voltage output module, voltage sampling module and short circuit protection module; the sampling end of voltage sampling module is electrically connected with voltage output module, and the output end of voltage sampling module is electrically connected with the input terminal of short circuit protection module；Voltage sampling module includes filter unit, voltage regulation unit and first switch unit; the input terminal of filter unit is electrically connected with the output end of voltage output module; the input terminal of filter unit is electrically connected with voltage regulation unit and first switch unit respectively; and the output end of voltage regulation unit is electrically connected with the input control end of first switch unit, the output end of first switch unit is electrically connected with short circuit protection module.The utility model provides the short-circuit protection circuit and short circuit protection system of a kind of raising discrimination that the load capacity of power supply output module not only can be improved but also normal short-circuit protection function may be implemented.
Description
Technical field
The utility model relates to power circuit field, more particularly to a kind of short-circuit protection circuit for improving discrimination and short
Protect system in road.
Background technique
Short-circuit protection circuit be to conductor not equipotential in power supply system the short trouble for being electrically shorted generation into
Capable protection.Implementing a kind of simplest method of short-circuit protection is installing fuse, is followed by increased suddenly using electric current and electric
Press the Current Voltage relay protection that declines suddenly, can specifically be divided into the overcurrent protection for having time limit (specified time or the inverse time lag),
Without time limit has the instantaneous over-current in time limit is protected, three-stage overcurrent protection Current Voltage is chain to have time limit overcurrent or fast tripping protection
Deng.The most commonly used is the disconnected short-circuit protection of the without time limit being made of electromagnetic type relay, such as feeding switch for China's coal mines underground
The direct action expression of first degree protective device of middle use, the direct action secondary protector used in high voltage distribution installation and indirectly
Act quadratic expression protection dress.
However, in traditional power supply output module, as long as the output end load one when power supply output module is overloaded
The case where, power-supply system starting protection will be made to operate, so that power supply output module can be made to stop working, and when power supply is defeated
When short circuit occurs in module out, guarantee that short-circuit protection function may be implemented in power supply output module again, therefore, how both can be with
It is that those skilled in the art need to examine that normal short-circuit protection function, which may be implemented, in the load capacity for improving power supply output module again
The problem of worry.
Utility model content
The purpose of the utility model is to overcome shortcomings in the prior art, and providing one kind both can be improved power supply output
The short-circuit protection circuit of the raising discrimination of normal short-circuit protection function may be implemented in the load capacity of module again and short circuit is protected
Protecting system.
The purpose of this utility model is achieved through the following technical solutions:
A kind of short-circuit protection circuit improving discrimination, comprising: voltage output module, voltage sampling module and short-circuit protection
The sampling end of module, the voltage sampling module is electrically connected with the voltage output module, the output of the voltage sampling module
End is electrically connected with the input terminal of the short circuit protection module；
The voltage sampling module includes filter unit, voltage regulation unit and first switch unit, the filter unit it is defeated
Enter end be electrically connected with the output end of the voltage output module, the input terminal of the filter unit respectively with the voltage regulation unit and
It is electrically connected described in the first switch unit, and the input control of the output end of the voltage regulation unit and the first switch unit
End electrical connection, the output end of the first switch unit are electrically connected with the short circuit protection module.
The filter unit includes capacitor C110 in one of the embodiments, the first end of the capacitor C110 and institute
Voltage output module electrical connection is stated, the second end of the capacitor C110 is electrically connected with the first switch unit.
The voltage regulation unit includes zener diode D100 in one of the embodiments, the zener diode D100
Cathode be electrically connected with the second end of the capacitor C110, the plus earth of the zener diode D100.
The first switch unit includes triode Q100 in one of the embodiments, the base of the triode Q100
Pole is electrically connected with the second end of the capacitor C110, the input of the collector and the short circuit protection module of the triode Q100
End electrical connection.
The voltage sampling module further includes partial pressure unit in one of the embodiments, the input of the partial pressure unit
End is electrically connected with the output end of the filter unit, the input terminal of the output end of the partial pressure unit and the first switch unit
Electrical connection.
The partial pressure unit includes resistance R117 and resistance R118 in one of the embodiments, the resistance R117's
First end is electrically connected with the output end of the filter unit, the second end of the resistance R117 respectively with the first switch unit
Input terminal and the resistance R118 first end electrical connection, the resistance R118 second end ground connection.
The voltage output module includes transformer unit and second switch unit in one of the embodiments, described
Transformer unit is electrically connected with the second switch unit, and the second switch unit is electrically connected with the filter unit.
The transformer unit includes primary T101A and transformer secondary output in one of the embodiments,
T101B, the primary T101A are electrically connected with the transformer secondary output T101B, the transformer secondary output T101B also with
The input terminal of the filter unit is electrically connected.
The second switch unit includes triode Q101 and resistance R115, three pole in one of the embodiments,
The base stage of pipe Q101 is electrically connected with the output end of the primary T101A, the collector of the triode Q101 with it is described
The output end of transformer secondary output T101B is electrically connected, the emitter of the triode Q101 respectively with the resistance R115 first
The input terminal of end and the short circuit protection module is electrically connected, the second end ground connection of the resistance R115.
A kind of short circuit protection system improving discrimination, including short-circuit protection circuit described in any of the above one.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of short-circuit protection circuit and short circuit protection system for improving discrimination, single by setting filtering
Member, voltage regulation unit and first switch unit then can be with normallies the when the output sine-wave oscillation signal of output end
One switch unit, to drag down the control signal of short circuit protection module, and then without short-circuit protection；When output end appearance is short
When road, then first switch unit can be made to be not turned on, and then the voltage signal of output end can drive short circuit protection module work
Make, and then realizes the short-circuit protection function of power supply output module.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of the short-circuit protection circuit of the raising discrimination of one embodiment of the utility model；
Fig. 2 is the functional block diagram of voltage sampling module shown in FIG. 1；
Fig. 3 is the circuit diagram of short-circuit protection circuit shown in FIG. 1；
Fig. 4 is the circuit diagram of the short circuit protection system of the raising discrimination of an embodiment of the present invention.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Referring to Fig. 1, a kind of short-circuit protection circuit for improving discrimination, comprising: voltage output module 100, voltage sampling
The sampling end of module 200 and short circuit protection module 300, the voltage sampling module is electrically connected with the voltage output module, institute
The output end for stating voltage sampling module is electrically connected with the input terminal of the short circuit protection module.It should be noted that the voltage
Output module 100 is for exporting sine-wave oscillation voltage signal, and voltage output module 100 has also been electrically connected external bear
It carries, the voltage sampling module 200 is believed for realizing voltage sampling, that is, to the sine-wave oscillation of voltage output module 100
It number is sampled, short-circuit protection of the short circuit protection module 300 for realizing power supply output module, protection and voltage output mould
The load that block 100 connects is not damaged, improves the protective capability of power supply output module and improves the reliability of power module.
Referring to Fig. 2, the voltage sampling module 200 includes filter unit 210, voltage regulation unit 220 and first switch list
Member 230, the input terminal of the filter unit is electrically connected with the output end of the voltage output module, the input of the filter unit
End be electrically connected respectively with described in the voltage regulation unit and the first switch unit, and the output end of the voltage regulation unit with it is described
The input control end of first switch unit is electrically connected, and output end and the short circuit protection module of the first switch unit are electrically connected
It connects.It should be noted that the filter unit 210 hinders direct current for playing the role of logical exchange, and mould is exported for sampling voltage
The sine-wave oscillation signal of block 100；The voltage regulation unit 220 is for realizing stable voltage input to first switch unit 230
In；The the starting or shutting down for realizing short-circuit protection of first switch unit 230.
In this way, when the output sine-wave oscillation signal of output end, then can with normally first switch unit, from
And the control signal of short circuit protection module is dragged down, and then without short-circuit protection；When short circuit occurs in output end, then can
So that first switch unit is not turned on, and then the voltage signal of output end can drive short circuit protection module to work, and then realize electricity
The short-circuit protection function of source output module.
Referring to Fig. 2, the voltage sampling module 200 further includes partial pressure unit 240, the partial pressure unit 240
Input terminal is electrically connected with the output end of the filter unit, and the output end of the partial pressure unit is defeated with the first switch unit
Enter end electrical connection.It should be noted that the partial pressure unit 240 acts on for realizing the partial pressure to input voltage.
Referring to Fig. 3, the filter unit includes capacitor C110, the first end and the voltage output of the capacitor C110
Module electrical connection, the second end of the capacitor C110 are electrically connected with the first switch unit.The first switch unit includes
Triode Q100, the base stage of the triode Q100 are electrically connected with the second end of the capacitor C110, the triode Q100's
Collector is electrically connected with the input terminal of the short circuit protection module.
The output end of voltage output module 100 has a sine-wave oscillation signal, by the way that the short-circuit protection circuit is arranged
Can detecte the sine-wave oscillation signal of output end, specifically, when output end is fully loaded with, voltage output module 100 it is defeated
Outlet has sine-wave oscillation, and capacitor C110 is logical exchange stopping direct current, so the AC signal of sine-wave oscillation passes through
Capacitor C110 turn-on transistor Q100 drags down the control input of short circuit protection module to drag down the non-inverting input terminal of U100A
End, and then without short-circuit protection；When exporting terminal shortcircuit, the output end of voltage output module 100 is complete stopping vibration
It swings, that is, exports a direct current signal into capacitor C110, since the capacitor C110 has the characteristic of logical exchange stopping direct current, thus
Direct current signal is without capacitor C110, that is, is not turned on triode Q100, so that drawing high the homophase input of U100A
That is, the control signal of short circuit protection module is drawn high, and then realizes the short-circuit protection function of power supply output module in end.
Referring to Fig. 3, the voltage regulation unit includes zener diode D100, the cathode of the zener diode D100 and institute
State the second end electrical connection of capacitor C110, the plus earth of the zener diode D100.Three poles are input in this way, can stablize
Voltage in pipe Q100 guarantees that triode Q100 can normally work, improves the stability of triode Q100.
Referring to Fig. 3, the partial pressure unit includes resistance R117 and resistance R118, the first end of the resistance R117 and institute
State filter unit output end electrical connection, the second end of the resistance R117 respectively with the input terminal of the first switch unit and
The first end of the resistance R118 is electrically connected, the second end ground connection of the resistance R118.In this way, passing through setting resistance R117 and electricity
Hinder R118, can play the role of partial pressure, at the same can also the further stable voltage being input in triode Q100, improve three
Stability when pole pipe Q100 works.
It should be noted that the voltage output module includes transformer unit and second switch unit, the transformer
Unit is electrically connected with the second switch unit, and the second switch unit is electrically connected with the filter unit.The transformer
Unit is for exporting sine-wave oscillation voltage signal；The second switch unit, can be with for being directly connected to short circuit protection module
Realize short-circuit protection function.
Referring to Fig. 4, the transformer unit includes primary T101A and transformer secondary output T101B, the transformation
Device primary T101A is electrically connected with the transformer secondary output T101B, the transformer secondary output T101B also with the filter unit
Input terminal electrical connection.
Referring to Fig. 4, the second switch unit includes triode Q101 and resistance R115, the triode Q101
Base stage be electrically connected with the output end of the primary T101A, the collector of the triode Q101 and the transformer
The output end of secondary T101B is electrically connected, the emitter of the triode Q101 respectively with the first end of the resistance R115 and institute
State the input terminal electrical connection of short circuit protection module, the second end ground connection of the resistance R115.In this way, passing through setting triode Q101
And resistance R115, the voltage output of primary T101A output end can be made to the base stage of triode Q101, to be connected
Triode Q101, the input terminal of the short circuit protection module then connected from the emitter of triode Q101 by access high level, from
And make the function of short circuit protection module starting short-circuit protection.
A kind of short circuit protection system improving discrimination, including short-circuit protection circuit, voltage input circuit and load output
Circuit, the output end of the voltage input circuit are electrically connected with the voltage output module of the short-circuit protection circuit, the short circuit
The output end of protection circuit is electrically connected with the load output circuit.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of short-circuit protection circuit and short circuit protection system for improving discrimination, single by setting filtering
Member, voltage regulation unit and first switch unit then can be with normallies the when the output sine-wave oscillation signal of output end
One switch unit, to drag down the control signal of short circuit protection module, and then without short-circuit protection；When output end appearance is short
When road, then first switch unit can be made to be not turned on, and then the voltage signal of output end can drive short circuit protection module work
Make, and then realizes the short-circuit protection function of power supply output module.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of short-circuit protection circuit for improving discrimination characterized by comprising voltage output module, voltage sampling module
And short circuit protection module, the sampling end of the voltage sampling module are electrically connected with the voltage output module, the voltage sampling
The output end of module is electrically connected with the input terminal of the short circuit protection module；
The voltage sampling module includes filter unit, voltage regulation unit and first switch unit, the input terminal of the filter unit
Be electrically connected with the output end of the voltage output module, the input terminal of the filter unit respectively with the voltage regulation unit and described
It is electrically connected described in first switch unit, and the input control end of the output end of the voltage regulation unit and first switch unit electricity
Connection, the output end of the first switch unit are electrically connected with the short circuit protection module.
2. the short-circuit protection circuit according to claim 1 for improving discrimination, which is characterized in that the filter unit includes
Capacitor C110, the first end of the capacitor C110 are electrically connected with the voltage output module, the second end of the capacitor C110 with
The first switch unit electrical connection.
3. the short-circuit protection circuit according to claim 2 for improving discrimination, which is characterized in that the voltage regulation unit includes
Zener diode D100, the cathode of the zener diode D100 are electrically connected with the second end of the capacitor C110, the pressure stabilizing
The plus earth of diode D100.
4. the short-circuit protection circuit according to claim 2 for improving discrimination, which is characterized in that the first switch unit
Including triode Q100, the base stage of the triode Q100 is electrically connected with the second end of the capacitor C110, the triode
The collector of Q100 is electrically connected with the input terminal of the short circuit protection module.
5. the short-circuit protection circuit according to claim 1 for improving discrimination, which is characterized in that the voltage sampling module
It further include partial pressure unit, the input terminal of the partial pressure unit is electrically connected with the output end of the filter unit, the partial pressure unit
Output end be electrically connected with the input terminal of the first switch unit.
6. the short-circuit protection circuit according to claim 5 for improving discrimination, which is characterized in that the partial pressure unit includes
Resistance R117 and resistance R118, the first end of the resistance R117 are electrically connected with the output end of the filter unit, the resistance
The second end of R117 is electrically connected with the first end of the input terminal of the first switch unit and the resistance R118 respectively, the electricity
Hinder the second end ground connection of R118.
7. the short-circuit protection circuit according to claim 1 for improving discrimination, which is characterized in that the voltage output module
Including transformer unit and second switch unit, the transformer unit is electrically connected with the second switch unit, and described second
Switch unit is electrically connected with the filter unit.
8. the short-circuit protection circuit according to claim 7 for improving discrimination, which is characterized in that the transformer unit packet
Include primary T101A and transformer secondary output T101B, the primary T101A and transformer secondary output T101B electricity
Connection, the transformer secondary output T101B are also electrically connected with the input terminal of the filter unit.
9. the short-circuit protection circuit according to claim 8 for improving discrimination, which is characterized in that the second switch unit
Including triode Q101 and resistance R115, the output end electricity of the base stage of the triode Q101 and the primary T101A
Connection, the collector of the triode Q101 are electrically connected with the output end of the transformer secondary output T101B, the triode Q101
Emitter be electrically connected respectively with the input terminal of the first end of the resistance R115 and the short circuit protection module, the resistance
The second end of R115 is grounded.
10. a kind of short circuit protection system for improving discrimination, which is characterized in that including described in any one of claim 1~9
Short-circuit protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822254462.2U CN209419205U (en) | 2018-12-29 | 2018-12-29 | Improve the short-circuit protection circuit and short circuit protection system of discrimination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822254462.2U CN209419205U (en) | 2018-12-29 | 2018-12-29 | Improve the short-circuit protection circuit and short circuit protection system of discrimination |
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| CN209419205U true CN209419205U (en) | 2019-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802373A (en) * | 2018-12-29 | 2019-05-24 | 惠州三华工业有限公司 | Improve the short-circuit protection circuit and short circuit protection system of discrimination |
-
2018
- 2018-12-29 CN CN201822254462.2U patent/CN209419205U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802373A (en) * | 2018-12-29 | 2019-05-24 | 惠州三华工业有限公司 | Improve the short-circuit protection circuit and short circuit protection system of discrimination |
| CN109802373B (en) * | 2018-12-29 | 2024-03-22 | 惠州三华工业有限公司 | Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system |
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