CN104078921A - Controller with short-circuit protection device - Google Patents
Controller with short-circuit protection device Download PDFInfo
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- CN104078921A CN104078921A CN201310125315.4A CN201310125315A CN104078921A CN 104078921 A CN104078921 A CN 104078921A CN 201310125315 A CN201310125315 A CN 201310125315A CN 104078921 A CN104078921 A CN 104078921A
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- controller
- short
- circuit protection
- voltage
- power supply
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Abstract
Disclosed is a controller with a short-circuit protection device. The controller with the short-circuit protection device comprises a power source and a switch used for cutting off the power output. The controller further comprises a control module used for controlling the using state of the switch and a detection module used for detecting the output voltage of the power source. The control module is used for controlling the using state of the switch according to output signals of the detection module. According to the controller with the short-circuit protection device, the detection module is used for detecting the output voltage size of the power source, when the output voltage value of the power source is lower than a rated value of the detection module, the detection module can transmit one output signal to the control module, the control module can turn off the switch in the controller according to the output signal, and therefore the purpose that the controller is protected from being damaged can be achieved.
Description
Technical field
The present invention relates to a kind of power-supply device, particularly a kind of controller with short-circuit protection that protection can be provided when load short circuits.
Background technology
Short-circuit protection circuit is all extremely important for various electrical equipment, once output voltage is short-circuited, may cause circuit burnout, and breaking-up equipment, makes troubles and lose to user.As shown in Figure 1, be the circuit diagram of a kind of short-circuit protection circuit of the prior art.This short-circuit protection circuit comprises a power Vcc, a diode D2,1, one the second resistance R 2 of first resistance R, and a photoelectrical coupler U1A.Described photoelectrical coupler U1A comprises a light-emitting diode D2 and a phototriode T1.When described switch J1 disconnects, being equivalent to described load circuit normally works, power Vcc provides a forward bias to described photoelectrical coupler U1A, described light-emitting diode D2 conducting is luminous, described phototriode T1 is subject to photoconduction logical, the voltage of described power Vcc is sent to described load circuit, and is load circuit power supply.
When described switch J1 is closed; being equivalent to described load is short-circuited; described switch J1 reduces to 0 in transient voltage; also moment is OV to described resistance R 2 left end voltages; the voltage in described resistance R 1 cannot make described light-emitting diode D2 conducting, and described light-emitting diode D2 is not luminous, described phototriode T1 cut-off; the voltage of described power Vcc cannot be sent to described load circuit, thereby realizes the function of output voltage short-circuit protection.
When this short-circuit protection circuit is normally worked at circuit; it is also always in running order, therefore can cause the loss to components and parts such as diode, triodes, but also can increase the consumption of the energy; because loss exists always, also can shorten the life-span of whole circuit in addition.
Summary of the invention
In view of this, be necessary to provide a kind of controller with short-circuit protection that can reduce the consumption of each components and parts and the energy, to overcome above-mentioned deficiency.
A controller with short-circuit protection, it comprises a power supply, and a switch of exporting for turn-offing this power supply.Described controller also comprises that one for controlling the control module of the use state of described switch, and a detection module for detection of the output voltage of described power supply, described control module is controlled the use state of described switch according to the output signal of described detection module.
Compared with prior art; the described controller with short-circuit protection detects the height of the output voltage of power supply by described detection module; when the output voltage values of this power supply is during lower than the rated value of described detection module; this detection module is about to transmit one and outputs signal to control module; this control module will be turn-offed the switch in controller according to this output signal, and then reaches the object that this controller of protection is not damaged.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described, wherein:
Fig. 1 is the circuit diagram of the short-circuit protection circuit of prior art.
Fig. 2 is a kind of schematic block circuit diagram with the controller of short-circuit protection provided by the invention.
Fig. 3 is a kind of circuit diagram of the controller with short-circuit protection of Fig. 2.
Fig. 4 is the another kind of circuit diagram of the controller with short-circuit protection of Fig. 2.
Embodiment
Based on accompanying drawing, specific embodiments of the invention are further elaborated below.Should be appreciated that specific embodiment described herein is only as embodiment, the protection range being not intended to limit the present invention.
Refer to Fig. 2 to Fig. 4, it is a kind of schematic block circuit diagram and circuit diagram with the controller 100 of short-circuit protection provided by the present invention.The described controller 100 with short-circuit protection comprises a power supply 10; a switch 11 being electrically connected with this power supply 10; a load 12 being electrically connected with this switch 11 and power supply 10; one for controlling the control module 13 of the use state of described switch 11, and a detection module 14 for detection of the output voltage of described power supply 10.
Need to further illustrate, in above-mentioned each functional unit or module, parameter, function, structure and the operation principle etc. of related electronic circuit components and parts are all those skilled in the art's technology known, at this, will repeat no more.
Described load 12 can be LED light fixture, or ordinary lamp and lantern is as Halogen lamp LED etc., and it is determined according to actual use occasion.Along with the raising of environmental consciousness and energy-conservation requirement, LED light fixture becomes the trend of shining at home use with business, and therefore, in the present embodiment, described load 12 is LED lamp.
Described power supply 10 can be the alternating currents such as civil power, generating set or direct current etc., and it is set as required, in the present embodiment, and because described load 12 is LED lamp, so the DC power supply that described power supply 10 is 24V.As Fig. 3 circuit diagram that is a kind of AC power, and the circuit diagram that Fig. 4 is a kind of DC power supply, the operation principle of these two kinds of circuit is the same substantially.
Described switch element 11 can be master switch, contactor, metal oxide semiconductor field effect tube (Metal-Oxid-Semiconductor is called for short metal-oxide-semiconductor) etc.In the present embodiment, described switch 12 is metal-oxide-semiconductor Q1.Those skilled in the art should be appreciated that this metal-oxide-semiconductor Q1 has grid, drain electrode and source electrode.The grid of described metal-oxide-semiconductor Q1 is connected with the output of control module 13, and source electrode is connected with power supply 10, and drain electrode is connected with load 12.For this switch 11 is carried out to voltage-limiting protection, this switch 11 can also comprise a current-limiting resistance.This current-limiting resistance is arranged between power supply 10 and metal-oxide-semiconductor Q1.
Described control module 13 is for turn-offing described switch 11 according to the input signal from detection module 14; thereby reaching the described controller 100 of protection avoids burning in short circuit; when load 12 short circuit, this control module 13 will be turn-offed described switch 11 to protect this controller 100 according to the output signal of detection module 14.Described control module 13 can comprise timer, and single-chip microcomputer, or other control units, as CPU (CPU).Circuit diagram while as shown in Figure 4, comprising a single-chip microcomputer for described control module 13.Single-chip microcomputer is a kind of integrated circuit (IC) chip, and it adopts very large scale integration technology that the functions (may also comprise the circuit such as display driver circuit, pulse-width modulation circuit, analog multiplexer, A/D converter) such as central processing unit, random asccess memory, read-only memory, multiple I/O mouth and interrupt system, timer/timer with data-handling capacity are integrated on a silicon chip.Therefore, can to this control module 13, carry out programming Control according to actual conditions, as system initialization, set I/O port, and I/O port interruption judgement supervisor, to complete the control of 13 pairs of switches 11 of this control module.The control module 13 that this single-chip microcomputer forms, by according to the input signal from detection module 14, judges whether to export an output signal of turn-offing described switch 12.Well-known, single-chip microcomputer has one for receiving the I/O port of the output signal of detection module 14, at once switch 14 metal-oxide-semiconductor Q1 is turn-offed, to prevent that this metal-oxide-semiconductor Q1 is burned when this I/O port receives the output signal of described detection module 14.
Described detection module 14 is electrically connected between described power supply 10 and control module 13, for detection of the height of the output voltage of power supply 10, and this signal is input to control module 13 to allow the shutoff of these control module 13 control switchs 11 with closed.Described detection module 14 comprises a voltage-stabiliser tube D4, a diode D3, and a capacitor C 1.Described voltage-stabiliser tube D4, triode D3 and capacitor C 1 are arranged in parallel between the both positive and negative polarity of power supply 10, simultaneously in parallel with load 12.When described control module 13 is single-chip microcomputer, described detection module 14 also comprises a voltage reduction module 141, and this voltage reduction module 141 is used to described this single-chip microcomputer that suitable voltage is provided when when described load 12 normal work.Described voltage-stabiliser tube D4 is for judging the height of output voltage of power supply 10, its voltage stabilizing value choose the starting resistor that has determined control module 13.If the output voltage when power supply 10 is 24V, the voltage stabilizing value of this voltage-stabiliser tube D4 is 18V, when load 12 short circuit, when as long as the output voltage of power supply 10 drops to lower than 18V, this voltage-stabiliser tube D4 will end, now, control module 13 just will start work, therefore the voltage stabilizing value of this voltage-stabiliser tube D4 will become the specified input value of described detection module 14, and input value is only less than this specified input value, and this detection module 13 just will start work.Can expect, the voltage stabilizing value of this voltage-stabiliser tube D4 can be according to actual needs as the response time be chosen.The voltage stabilizing value of described voltage-stabiliser tube D4 and the output voltage values of power supply 10 are more approaching, and its response time also will be shorter, to switch 14 as the infringement of metal-oxide-semiconductor Q1 also will be less.Described diode D3 will be in conducting state when voltage-stabiliser tube D4 ends, for for described monolithic function is normally received from these detection module 14 signals, described detection module 14 also comprises two resistance R 3, R4, these two resistance R 3, R4 connect to carry out dividing potential drop when described voltage-stabiliser tube D4 ends with described diode D3, thereby input suitable voltage value signal and then start this single-chip microcomputer work to turn-off described switch 11 to single-chip microcomputer.Described capacitor C 1 is for be the power supply of described single-chip microcomputer when voltage-stabiliser tube D4 ends, to guarantee described single-chip microcomputer endure a period of time when load 12 short circuit.In capacitor C 1 electric discharge, make this following period of time of single-chip microcomputer work, described switch 11 as metal-oxide-semiconductor will be always in off state, thereby this metal-oxide-semiconductor is dispelled the heat as far as possible.
The described controller 100 with short-circuit protection also comprises an input anti-reverse device 15 for preventing that the both positive and negative polarity of described power supply 10 is inverted, and this input anti-reverse device 15 is arranged between described power supply 10 and detection module 14.Described input anti-reverse device 15 can comprise at least one diode.In the present embodiment, described input anti-reverse device 15 comprises two diode D1, D2.These two diode D1, D2 are electrically connected at respectively in the circuit of detection module 14 as connect with voltage-stabiliser tube D4, diode D3 respectively, utilize the one-way conduction characteristic of diode, reach the object of the both positive and negative polarity reversal connection that prevents power supply 10.
Compared with prior art; the described controller 100 with short-circuit protection detects the height of the output voltage of power supply 10 by described detection module 14; when the output voltage values of this power supply 10 is during lower than the rated value of described detection module 14; this detection module 14 is about to transmit a signal to control module 13; this control module will be turn-offed the switch 11 in controller 100, and then reaches the object that this controller 100 of protection is not damaged.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all interior done any modifications in the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included in protection scope of the present invention in.
Claims (10)
1. a controller with short-circuit protection; it comprises a power supply; an and switch of exporting for turn-offing this power supply; it is characterized in that; described controller also comprises that one for controlling the control module of the use state of described switch; and a detection module for detection of the output voltage of described power supply, described control module is controlled the use state of described switch according to the output signal of described detection module.
2. the controller with short-circuit protection as claimed in claim 1; it is characterized in that: described controller also comprises an input anti-reverse device for preventing that the both positive and negative polarity of described power supply is inverted, and this input anti-reverse device is arranged between described power supply and detection module.
3. the controller with short-circuit protection as claimed in claim 2, is characterized in that: described input anti-reverse device comprises at least one diode.
4. the controller with short-circuit protection as claimed in claim 1, is characterized in that: described control module is single-chip microcomputer or central processing unit.
5. the controller with short-circuit protection as claimed in claim 4, is characterized in that: described detection module also comprises a voltage reduction module, and this voltage reduction module is used to described single-chip microcomputer that suitable voltage is provided.
6. the controller with short-circuit protection as claimed in claim 1; it is characterized in that: described control module is single-chip microcomputer; described detection module comprises a voltage-stabiliser tube D4; a diode D3; an and capacitor C 1; described voltage-stabiliser tube D4 is for judging the height of the output voltage of power supply, and described diode D3 is in conducting state when voltage-stabiliser tube D4 ends, and described capacitor C 1 for being described single-chip microcomputer power supply when voltage-stabiliser tube D4 ends.
7. the controller with short-circuit protection as claimed in claim 1; it is characterized in that: described detection module also comprises two resistance R 3, R4; these two resistance R 3, R4 connect with described diode D3; when described voltage-stabiliser tube D4 cut-off, carry out dividing potential drop, think that described single-chip microcomputer provides the signal detecting.
8. the controller with short-circuit protection as claimed in claim 1, is characterized in that: described switch is a metal oxide semiconductor field effect tube (Metal-Oxid-Semiconductor is called for short metal-oxide-semiconductor).
9. the controller with short-circuit protection as claimed in claim 8, is characterized in that: the grid of described metal-oxide-semiconductor is connected with the output of control module, and source electrode is connected with power cathode, and drain electrode is connected with described load.
10. the controller with short-circuit protection as claimed in claim 1, is characterized in that: described switch is a master switch, contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125315.4A CN104078921B (en) | 2013-03-28 | 2013-03-28 | A kind of controller with short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310125315.4A CN104078921B (en) | 2013-03-28 | 2013-03-28 | A kind of controller with short-circuit protection |
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| Publication Number | Publication Date |
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| CN104078921A true CN104078921A (en) | 2014-10-01 |
| CN104078921B CN104078921B (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310125315.4A Active CN104078921B (en) | 2013-03-28 | 2013-03-28 | A kind of controller with short-circuit protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107438302A (en) * | 2016-05-26 | 2017-12-05 | 重庆恒又源科技发展有限公司 | LED short circuit protection systems |
| CN107529240A (en) * | 2016-06-22 | 2017-12-29 | 赛尔富电子有限公司 | A kind of power circuit applied to LED |
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| JPH02184220A (en) * | 1989-01-09 | 1990-07-18 | Mitsubishi Electric Corp | Multi-terminal dc circuit breaker |
| CN101615780A (en) * | 2009-07-15 | 2009-12-30 | 袁留路 | Intelligent power supply protector |
| CN101801145A (en) * | 2010-04-23 | 2010-08-11 | 海洋王照明科技股份有限公司 | Led lamp control circuit and led lamp |
| CN101958527A (en) * | 2010-10-16 | 2011-01-26 | 深圳茂硕电源科技股份有限公司 | Boost type LED constant flow source under-voltage protection circuit |
| CN203327292U (en) * | 2013-03-28 | 2013-12-04 | 林万炯 | Controller provided with short-circuit protection apparatus |
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2013
- 2013-03-28 CN CN201310125315.4A patent/CN104078921B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02184220A (en) * | 1989-01-09 | 1990-07-18 | Mitsubishi Electric Corp | Multi-terminal dc circuit breaker |
| CN101615780A (en) * | 2009-07-15 | 2009-12-30 | 袁留路 | Intelligent power supply protector |
| CN101801145A (en) * | 2010-04-23 | 2010-08-11 | 海洋王照明科技股份有限公司 | Led lamp control circuit and led lamp |
| CN101958527A (en) * | 2010-10-16 | 2011-01-26 | 深圳茂硕电源科技股份有限公司 | Boost type LED constant flow source under-voltage protection circuit |
| CN203327292U (en) * | 2013-03-28 | 2013-12-04 | 林万炯 | Controller provided with short-circuit protection apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107438302A (en) * | 2016-05-26 | 2017-12-05 | 重庆恒又源科技发展有限公司 | LED short circuit protection systems |
| CN107529240A (en) * | 2016-06-22 | 2017-12-29 | 赛尔富电子有限公司 | A kind of power circuit applied to LED |
| CN107529240B (en) * | 2016-06-22 | 2024-03-15 | 赛尔富电子有限公司 | Power supply circuit applied to LED lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104078921B (en) | 2018-05-04 |
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Effective date of registration: 20171229 Address after: 315103 Ningbo national high tech Zone, Zhejiang, No. 1345 Applicant after: SELF ELECTRONICS CO., LTD. Address before: The national high tech Zone Juxian 315103 Ningbo Road, Zhejiang province No. 1345 Ningbo Purcell Electronics Ltd. Applicant before: Lin Wanjiong |
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