CN109802373B - Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system - Google Patents
Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system Download PDFInfo
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- CN109802373B CN109802373B CN201811644944.7A CN201811644944A CN109802373B CN 109802373 B CN109802373 B CN 109802373B CN 201811644944 A CN201811644944 A CN 201811644944A CN 109802373 B CN109802373 B CN 109802373B
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000010356 wave oscillation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a short-circuit protection circuit and a short-circuit protection system for improving discrimination, which comprise a voltage output module, a voltage sampling module and a short-circuit protection module, wherein a sampling end of the voltage sampling module is electrically connected with the voltage output module, and an output end of the voltage sampling module is electrically connected with an input end of the short-circuit protection module; the voltage sampling module comprises a filtering unit, a voltage stabilizing unit and a first switch unit, wherein the input end of the filtering unit is electrically connected with the output end of the voltage output module, the input end of the filtering unit is respectively electrically connected with the voltage stabilizing unit and the first switch unit, the output end of the voltage stabilizing unit is electrically connected with the input control end of the first switch unit, and the output end of the first switch unit is electrically connected with the short-circuit protection module. The invention provides a short-circuit protection circuit and a short-circuit protection system which can improve the carrying capacity of a power output module and realize the improvement of the distinction degree of a normal short-circuit protection function.
Description
Technical Field
The invention relates to the field of power supply circuits, in particular to a short-circuit protection circuit and a short-circuit protection system for improving distinction.
Background
The short-circuit protection circuit is used for protecting short-circuit faults generated by electrically shorting unequal-potential conductors in a power supply system. The simplest method for implementing the short-circuit protection is to install a fuse, and then relay protection is carried out by utilizing the current and voltage with suddenly increased current and suddenly reduced voltage, and the method can be concretely classified into over-current protection with time limit (fixed time limit or inverse time limit), over-current break protection without time limit or with time limit, three-section over-current protection current and voltage linkage with time limit over-current or quick break protection and the like. The most commonly used underground coal mine is a non-time-limit short-circuit protection device composed of electromagnetic relays, such as a direct-action primary protection device adopted in a feed switch, and a direct-action secondary protection device and an indirect-action secondary protection device adopted in a high-voltage distribution device.
However, in the conventional power output module, when the overload condition occurs on the output end load of the power output module, the power supply system starts the protection operation, so that the power output module stops working, and when the power output module is short-circuited, the power output module is ensured to realize the short-circuit protection function, so that the problem that the technical personnel in the art need to consider can be solved how to improve the carrying capacity of the power output module and realize the normal short-circuit protection function.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a short-circuit protection circuit and a short-circuit protection system which can improve the carrying capacity of a power output module and realize the improvement of the distinction degree of a normal short-circuit protection function.
The aim of the invention is realized by the following technical scheme:
a short circuit protection circuit for improving discrimination, comprising: the device comprises a voltage output module, a voltage sampling module and a short-circuit protection module, wherein the sampling end of the voltage sampling module is electrically connected with the voltage output module, and the output end of the voltage sampling module is electrically connected with the input end of the short-circuit protection module;
the voltage sampling module comprises a filtering unit, a voltage stabilizing unit and a first switch unit, wherein the input end of the filtering unit is electrically connected with the output end of the voltage output module, the input end of the filtering unit is respectively electrically connected with the voltage stabilizing unit and the first switch unit, the output end of the voltage stabilizing unit is electrically connected with the input control end of the first switch unit, and the output end of the first switch unit is electrically connected with the short-circuit protection module.
In one embodiment, the filtering unit includes a capacitor C110, a first end of the capacitor C110 is electrically connected to the voltage output module, and a second end of the capacitor C110 is electrically connected to the first switching unit.
In one embodiment, the voltage stabilizing unit includes a voltage stabilizing diode D100, a cathode of the voltage stabilizing diode D100 is electrically connected to the second end of the capacitor C110, and an anode of the voltage stabilizing diode D100 is grounded.
In one embodiment, the first switching unit includes a transistor Q100, a base of the transistor Q100 is electrically connected to the second terminal of the capacitor C110, and a collector of the transistor Q100 is electrically connected to the input terminal of the short-circuit protection module.
In one embodiment, the voltage sampling module further includes a voltage dividing unit, an input end of the voltage dividing unit is electrically connected to an output end of the filtering unit, and an output end of the voltage dividing unit is electrically connected to an input end of the first switching unit.
In one embodiment, the voltage dividing unit includes a resistor R117 and a resistor R118, a first end of the resistor R117 is electrically connected to the output end of the filtering unit, a second end of the resistor R117 is electrically connected to the input end of the first switching unit and the first end of the resistor R118, and a second end of the resistor R118 is grounded.
In one embodiment, the voltage output module includes a transformer unit and a second switch unit, the transformer unit is electrically connected to the second switch unit, and the second switch unit is electrically connected to the filter unit.
In one embodiment, the transformer unit includes a primary transformer T101A and a secondary transformer T101B, the primary transformer T101A is electrically connected to the secondary transformer T101B, and the secondary transformer T101B is further electrically connected to the input terminal of the filter unit.
In one embodiment, the second switching unit includes a transistor Q101 and a resistor R115, where a base of the transistor Q101 is electrically connected to an output terminal of the primary transformer T101A, a collector of the transistor Q101 is electrically connected to an output terminal of the secondary transformer T101B, an emitter of the transistor Q101 is electrically connected to a first terminal of the resistor R115 and an input terminal of the short-circuit protection module, and a second terminal of the resistor R115 is grounded.
A differential-enhanced short-circuit protection system comprising the short-circuit protection circuit of any one of the above.
Compared with the prior art, the invention has the following advantages:
the invention relates to a short-circuit protection circuit and a short-circuit protection system for improving discrimination, which are characterized in that a filtering unit, a voltage stabilizing unit and a first switch unit are arranged, when a sine wave oscillation signal is output from an output end, the first switch unit can be normally conducted, so that a control input end of a short-circuit protection module is pulled down, and further short-circuit protection is not carried out; when the output end is short-circuited, the first switch unit is not conducted, and then the voltage signal of the output end drives the short-circuit protection module to work, so that the short-circuit protection function of the power supply output module is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of a differential-enhanced short-circuit protection circuit according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of the voltage sampling module shown in FIG. 1;
FIG. 3 is a circuit diagram of the short-circuit protection circuit shown in FIG. 1;
fig. 4 is a circuit diagram of a differential-enhanced short-circuit protection system according to an embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a short-circuit protection circuit for improving discrimination includes: the voltage sampling module 100, the voltage sampling module 200 and the short-circuit protection module 300, wherein the sampling end of the voltage sampling module is electrically connected with the voltage output module, and the output end of the voltage sampling module is electrically connected with the input end of the short-circuit protection module. It should be noted that, the voltage output module 100 is configured to output a sine wave oscillating voltage signal, and the voltage output module 100 is further electrically connected to an external load, the voltage sampling module 200 is configured to sample a voltage, that is, sample the sine wave oscillating signal of the voltage output module 100, and the short circuit protection module 300 is configured to implement short circuit protection of a power supply output module, protect the load connected to the voltage output module 100 from being damaged, improve the protection capability of the power supply output module, and improve the reliability of the power supply module.
Referring to fig. 2, the voltage sampling module 200 includes a filtering unit 210, a voltage stabilizing unit 220, and a first switch unit 230, wherein an input end of the filtering unit is electrically connected to an output end of the voltage output module, an input end of the filtering unit is electrically connected to the voltage stabilizing unit and the first switch unit, an output end of the voltage stabilizing unit is electrically connected to an input control end of the first switch unit, and an output end of the first switch unit is electrically connected to the short-circuit protection module. It should be noted that, the filtering unit 210 is configured to perform an ac-dc blocking function, and is configured to sample a sine wave oscillation signal of the voltage output module 100; the voltage stabilizing unit 220 is configured to achieve stable voltage input into the first switching unit 230; the first switch unit 230 is used for implementing the start or stop of the short-circuit protection.
Thus, when the sine wave oscillation signal is output from the output end, the first switch unit can be normally conducted, so that the control input end of the short-circuit protection module is pulled down, and short-circuit protection is not performed; when the output end is short-circuited, the first switch unit is not conducted, and then the voltage signal of the output end drives the short-circuit protection module to work, so that the short-circuit protection function of the power supply output module is realized.
Referring to fig. 2 again, the voltage sampling module 200 further includes a voltage dividing unit 240, wherein an input end of the voltage dividing unit 240 is electrically connected to an output end of the filtering unit, and an output end of the voltage dividing unit is electrically connected to an input end of the first switching unit. The voltage dividing unit 240 is used to divide the input voltage.
Referring to fig. 3, the filtering unit includes a capacitor C110, a first end of the capacitor C110 is electrically connected to the voltage output module, and a second end of the capacitor C110 is electrically connected to the first switching unit. The first switch unit comprises a triode Q100, a base electrode of the triode Q100 is electrically connected with the second end of the capacitor C110, and a collector electrode of the triode Q100 is electrically connected with the input end of the short-circuit protection module.
The output end of the voltage output module 100 is provided with a sine wave oscillation signal, the sine wave oscillation signal of the output end can be detected by arranging the short-circuit protection circuit, specifically, when the output end is full, the output end of the voltage output module 100 is provided with sine wave oscillation, and the capacitor C110 is connected with alternating current and is isolated from direct current, so that the alternating current signal of the sine wave oscillation is connected with the triode Q100 through the capacitor C110, thereby pulling down the non-inverting input end of the U100A, namely pulling down the control input end of the short-circuit protection module, and further not carrying out short-circuit protection; when the output end is short-circuited, the output end of the voltage output module 100 completely stops oscillating, i.e. outputs a direct current signal to the capacitor C110, and the capacitor C110 has the characteristic of blocking direct current by alternating current, so that the direct current signal does not pass through the capacitor C110, i.e. the triode Q100 is not conducted, and the in-phase input end of the U100A can be pulled up, i.e. the control input end of the short-circuit protection module is pulled up, thereby realizing the short-circuit protection function of the power output module.
Referring to fig. 3, the voltage stabilizing unit includes a voltage stabilizing diode D100, a cathode of the voltage stabilizing diode D100 is electrically connected to the second end of the capacitor C110, and an anode of the voltage stabilizing diode D100 is grounded. Thus, the voltage input into the triode Q100 can be stabilized, normal operation of the triode Q100 is ensured, and the stability of the triode Q100 is improved.
Referring to fig. 3, the voltage dividing unit includes a resistor R117 and a resistor R118, wherein a first end of the resistor R117 is electrically connected to an output end of the filtering unit, a second end of the resistor R117 is electrically connected to an input end of the first switching unit and a first end of the resistor R118, and a second end of the resistor R118 is grounded. Therefore, the resistor R117 and the resistor R118 can play a role in voltage division, and meanwhile, the voltage input into the triode Q100 can be further stabilized, so that the stability of the triode Q100 in operation is improved.
The voltage output module includes a transformer unit and a 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 used for outputting sine wave oscillation voltage signals; the second switch unit is used for being directly connected with the short-circuit protection module, and can realize a short-circuit protection function.
Referring to fig. 4, the transformer unit includes a primary transformer T101A and a secondary transformer T101B, the primary transformer T101A is electrically connected to the secondary transformer T101B, and the secondary transformer T101B is further electrically connected to the input terminal of the filtering unit.
Referring to fig. 4 again, the second switch unit includes a transistor Q101 and a resistor R115, a base of the transistor Q101 is electrically connected to an output end of the primary transformer T101A, a collector of the transistor Q101 is electrically connected to an output end of the secondary transformer T101B, an emitter of the transistor Q101 is electrically connected to a first end of the resistor R115 and an input end of the short-circuit protection module, and a second end of the resistor R115 is grounded. Therefore, by arranging the triode Q101 and the resistor R115, the voltage of the output end of the primary T101A of the transformer can be output to the base electrode of the triode Q101, so that the triode Q101 is conducted, and then the input end of the short-circuit protection module connected with the emitter electrode of the triode Q101 is connected with a high level, so that the short-circuit protection module starts a short-circuit protection function.
The utility model provides a short-circuit protection system for improving differentiation degree, includes short-circuit protection circuit, voltage input circuit and load output circuit, voltage input circuit's output with short-circuit protection circuit's voltage output module electricity is connected, short-circuit protection circuit's output with load output circuit electricity is connected.
Compared with the prior art, the invention has the following advantages:
the invention relates to a short-circuit protection circuit and a short-circuit protection system for improving discrimination, which are characterized in that a filtering unit, a voltage stabilizing unit and a first switch unit are arranged, when a sine wave oscillation signal is output from an output end, the first switch unit can be normally conducted, so that a control input end of a short-circuit protection module is pulled down, and further short-circuit protection is not carried out; when the output end is short-circuited, the first switch unit is not conducted, and then the voltage signal of the output end drives the short-circuit protection module to work, so that the short-circuit protection function of the power supply output module is realized.
The above embodiments represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. A short-circuit protection circuit for improving discrimination, comprising: the device comprises a voltage output module, a voltage sampling module and a short-circuit protection module, wherein the sampling end of the voltage sampling module is electrically connected with the voltage output module, and the output end of the voltage sampling module is electrically connected with the input end of the short-circuit protection module;
the voltage sampling module comprises a filtering unit, a voltage stabilizing unit and a first switch unit, wherein the input end of the filtering unit is electrically connected with the output end of the voltage output module, the input end of the filtering unit is respectively electrically connected with the voltage stabilizing unit and the first switch unit, the output end of the voltage stabilizing unit is electrically connected with the input control end of the first switch unit, and the output end of the first switch unit is electrically connected with the short-circuit protection module;
the filtering unit comprises a capacitor C110, a first end of the capacitor C110 is electrically connected with the voltage output module, and a second end of the capacitor C110 is electrically connected with the first switch unit;
the voltage stabilizing unit comprises a voltage stabilizing diode D100, wherein the cathode of the voltage stabilizing diode D100 is electrically connected with the second end of the capacitor C110, and the anode of the voltage stabilizing diode D100 is grounded;
the first switch unit comprises a triode Q100, a base electrode of the triode Q100 is electrically connected with the second end of the capacitor C110, and a collector electrode of the triode Q100 is electrically connected with the input end of the short-circuit protection module.
2. The improved discrimination short-circuit protection circuit of claim 1, wherein the voltage sampling module further includes a voltage dividing unit, an input of the voltage dividing unit is electrically connected to an output of the filtering unit, and an output of the voltage dividing unit is electrically connected to an input of the first switching unit.
3. The improved discrimination short-circuit protection circuit of claim 2, wherein the voltage dividing unit includes a resistor R117 and a resistor R118, a first end of the resistor R117 is electrically connected to the output of the filtering unit, a second end of the resistor R117 is electrically connected to the input of the first switching unit and the first end of the resistor R118, respectively, and a second end of the resistor R118 is grounded.
4. The improved discrimination short-circuit protection circuit of claim 1, wherein said voltage output module includes a transformer unit and a second switch unit, said transformer unit being electrically connected to said second switch unit, said second switch unit being electrically connected to said filter unit.
5. The improved discrimination short-circuit protection circuit of claim 4, wherein said transformer unit includes a transformer primary T101A and a transformer secondary T101B, said transformer primary T101A being electrically connected to said transformer secondary T101B, said transformer secondary T101B being further electrically connected to an input of said filter unit.
6. The circuit of claim 5, wherein the second switch unit comprises a transistor Q101 and a resistor R115, a base of the transistor Q101 is electrically connected to an output terminal of the transformer primary T101A, a collector of the transistor Q101 is electrically connected to an output terminal of the transformer secondary T101B, an emitter of the transistor Q101 is electrically connected to a first terminal of the resistor R115 and an input terminal of the short-circuit protection module, respectively, and a second terminal of the resistor R115 is grounded.
7. A short-circuit protection system with improved discrimination, characterized by comprising a short-circuit protection circuit according to any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811644944.7A CN109802373B (en) | 2018-12-29 | 2018-12-29 | Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811644944.7A CN109802373B (en) | 2018-12-29 | 2018-12-29 | Short-circuit protection circuit capable of improving distinction degree and short-circuit protection system |
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| Publication Number | Publication Date |
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| CN109802373A CN109802373A (en) | 2019-05-24 |
| CN109802373B true CN109802373B (en) | 2024-03-22 |
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| CN106300277A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | High-frequency inverter short-circuit protection control device |
| CN106786396A (en) * | 2017-01-16 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | One kind amendment ripple inverter intelligent type protective switch of the short circuit circuit |
| CN209419205U (en) * | 2018-12-29 | 2019-09-20 | 惠州三华工业有限公司 | Improve the short-circuit protection circuit and short circuit protection system of discrimination |
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2018
- 2018-12-29 CN CN201811644944.7A patent/CN109802373B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326325A (en) * | 2013-06-05 | 2013-09-25 | 广州凯盛电子科技有限公司 | Short-circuit and low-voltage protective circuit of output of switching power source |
| CN104577954A (en) * | 2013-10-22 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Transformer short-circuit protection circuit |
| CN106300277A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | High-frequency inverter short-circuit protection control device |
| CN106786396A (en) * | 2017-01-16 | 2017-05-31 | 广东百事泰电子商务股份有限公司 | One kind amendment ripple inverter intelligent type protective switch of the short circuit circuit |
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