CN102074943B - Current limiting protection device and power supply - Google Patents
Current limiting protection device and power supply Download PDFInfo
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- CN102074943B CN102074943B CN201010621278.2A CN201010621278A CN102074943B CN 102074943 B CN102074943 B CN 102074943B CN 201010621278 A CN201010621278 A CN 201010621278A CN 102074943 B CN102074943 B CN 102074943B
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Abstract
The invention discloses a current limiting protection device, which comprises a three-end voltage stabilizer and a temperature adjusting module, wherein in the three-end voltage stabilizer, the input end is connected with an input power supply, the output end is connected with a load, and the grounding end is grounded; and the temperature adjusting module is used for controlling the temperature of the three-end voltage stabilizer in a predetermined range when the current exceeds a limited value. The invention also discloses a power supply, which comprises an output rectifier filter circuit and the current limiting protection device, wherein the output end of the output rectifier filter circuit is connected with the three-end voltage stabilizer of the current limiting protection device. According to the current limiting protection device and the power supply provided by the embodiment of the invention, even if the load is in a long-term short circuit state, the output current of the power supply is stably controlled in a certain range; and compared with the constant current type current limiting circuit, the structure is simple, and the whole power loss is low.
Description
Technical field
The present invention relates to a kind of current-limiting protection device and power supply.
Background technology
The load circuit fault that often can be short-circuited in operational process, causes the damage of power-supply device thus.For solving this type of short circuit problem, prior art has three kinds of modes:
(1) cut-off type.Directly switch-off power converts or disconnection output loop.
Shortcoming: can not output current, can not automatically recover.
(2) formula of having the hiccups.On-Off try startup or output back and forth.
Shortcoming: can not output continuous stream.
(3) current-limiting type.Restriction output current is certain limit.
In some application scenario, as communications industry dual duplex/bis-triplexer, even being short-circuited property of LNA fault, power supply is still in requisition for electric current is provided.That is to say, now electric current does not allow to interrupt.Therefore can not adopt cut-off type, the scheme of the formula of having the hiccups short-circuit protection.
In industry, adopt at present constant-current type current limit circuits more, in to the research process of prior art, the present inventor finds, constant-current type current limit circuit has a lot of defects, and constant-current type current limit, from the design of circuit, is nothing but three kinds of schemes: the one, and the dutycycle of by-pass cock pipe, electric current is fallen little as far as possible, the shortcoming existing is due to the restriction that is subject to minimum duty cycle, if the impedance of short-circuit loop is enough little, electric current during short circuit is still very large.The 2nd, introduce other constant current source for output, the shortcoming of existence is that circuit is complicated, power dissipation ratio is larger.The 3rd, the method that secondary regulates in advance, allows most of unnecessary energy consumption on passive resistance rather than consumes on the transistor of series regulator, and the shortcoming of existence is to increase preposition adjuster, and whole power attenuation is still larger.
Summary of the invention
The present invention, for solving the defect that in prior art, constant-current type current limit circuit exists, provides a kind of current-limiting protection device and power supply.
The embodiment of the present invention provides a kind of current-limiting protection device, comprising:
Three terminal regulator, described three terminal regulator input end connects input power, and output terminal connects load, earth terminal ground connection;
Temperature adjustment module, for when electric current surpasses limit value, controls the temperature of three terminal regulator in preset range.
The embodiment of the present invention also provides a kind of power supply, comprises output rectifier and filter, also comprises above-mentioned current-limiting protection device, and described output rectifier and filter output terminal connects the three terminal regulator of described current-limiting protection device.
The embodiment of the present invention provides a kind of current-limiting protection device and power supply, though load in long-term short-circuit condition, also can make power supply outputting current steadily be controlled in certain scope, compare with constant-current type current-limiting circuit, simple in structure, overall power dissipation is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the embodiment of the present invention one current-limiting protection device structural representation;
Fig. 2 is three terminal regulator input voltage difference and output current value characteristic relation figure in the embodiment of the present invention one current-limiting protection device;
Fig. 3 is the embodiment of the present invention two current-limiting protection device structural representations;
Fig. 4 is the embodiment of the present invention two current-limiting protection device structural representations;
Fig. 5 is the embodiment of the present invention three current-limiting protection device circuit diagrams.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
A kind of current-limiting protection device of the present invention, comprising:
Three terminal regulator 2, described three terminal regulator 2 input ends connect input power 1, and output terminal connects load 3, earth terminal ground connection;
Temperature adjustment module 4, for when electric current surpasses limit value, controls the temperature of three terminal regulator in preset range.
Described three terminal regulator is class components and parts conventional in Power Electronic Technique, and three terminal regulator is packaged with three leading foots, and output voltage has fixed and adjustable two kinds.Three terminal regulator is built-in with the functions such as current limit, overheat protector, adds outer member few during application.
In the present invention, can select 78MXX series three terminal regulator, described three terminal regulator output fixed voltage 5V, load regulation ± 100mV, continuous wave output rated current is 0.50A, adopts TO-220 encapsulation.
Be illustrated in figure 2 the cut-off current characteristics of LM78XX series three terminal regulator, from figure, curve is found, if the input-output voltage difference of three terminal regulator within the specific limits time, current-limiting characteristic curve exists one section of level of approximation line.When the input-output magnitude of voltage of three terminal regulator is a certain value, the numerical values recited of output current can change along with the variation of three-terminal voltage-stabilizing actuator temperature.
Described temperature adjustment module is heating radiator, described three terminal regulator is fixed on heating radiator, thereby by radiator heat-dissipation, the temperature of three terminal regulator is controlled within the specific limits, also just realized three terminal regulator outputting current steadily and be controlled in certain scope.
When electric current surpasses limit value and refers to load short circuits or other reasons cause electric current excessive.
When there is load short circuits fault, if the voltage difference of the input end of three terminal regulator and output terminal is 8V-0V=8V, if can be by the suitable heating radiator of design, the junction temperature of three terminal regulator LM78M05CT is controlled between 25 ℃～150 ℃, and the output current of three terminal regulator LM78M05CT will be limited in the scope of about 600mA～1000mA.
The embodiment of the present invention provides a kind of current-limiting protection device, though load in long-term short-circuit condition, also can make power supply outputting current steadily be controlled in certain scope, compare with constant-current type current-limiting circuit, simple in structure, overall power dissipation is low.
Embodiment bis-
A kind of current-limiting protection device of the present invention, comprising:
Three terminal regulator 2, described three terminal regulator 2 input ends connect input power 1, and output terminal connects load 3, earth terminal ground connection;
Temperature adjustment module 4, for when electric current surpasses limit value, controls the temperature of three terminal regulator in preset range.
Described three terminal regulator is class components and parts conventional in Power Electronic Technique, and three terminal regulator is packaged with three leading foots, and output voltage has fixed and adjustable two kinds.Three terminal regulator is built-in with the functions such as current limit, overheat protector, adds outer member few during application.
In the present invention, can select 78MXX series three terminal regulator, described three terminal regulator output fixed voltage 5V, load regulation ± 100mV, continuous wave output rated current is 0.50A, adopts TO-220 encapsulation.
Be illustrated in figure 2 the cut-off current characteristics of LM78XX series three terminal regulator, from figure, curve is found, if the input-output voltage difference of three terminal regulator when certain limit, there is one section of level of approximation line in current-limiting characteristic curve.When the input-output magnitude of voltage of three terminal regulator is a certain value, the numerical values recited of output current can change along with the variation of three-terminal voltage-stabilizing actuator temperature.
Described temperature adjustment module 4 also comprises detecting unit 5 and heat-sink unit 6, and when described detecting unit 5 surpasses limit value for detection of electric current in circuit, heat-sink unit 6 is controlled three-terminal voltage-stabilizing actuator temperature in preset range.
A kind of embodiment, described heat-sink unit 6 comprises speed adjustment unit 8, and the temperature sensor 9 being connected with speed adjustment unit 8 respectively and fan 7, described temperature sensor is for measuring the temperature of three terminal regulator, described speed adjustment unit 8 is connected with detecting unit 5, when in detecting unit 5 testing circuits, electric current surpasses limit value, described speed adjustment unit 8 is controlled fan 7 and is started working, and controls and makes the temperature of three terminal regulator 2 in preset range.
Another kind of embodiment, described heat-sink unit is water cooling plant, and described water cooling plant comprises heating radiator, and heating radiator inside is provided with water inlet pipe and rising pipe, when electric current surpasses limit value in detecting unit 5 testing circuits, control and make the temperature of three terminal regulator 2 in preset range.
When electric current surpasses limit value and refers to load short circuits or other reasons cause electric current excessive.
The embodiment of the present invention provides a kind of current-limiting protection device, adopts the mode of air-cooled or water-cooled, even if load is in long-term short-circuit condition; also can make power supply outputting current steadily be controlled in certain scope; compare with constant-current type current-limiting circuit, simple in structure, overall power dissipation is low.
Embodiment tri-
A kind of current-limiting protection device of the present invention, comprising:
Three terminal regulator 2, described three terminal regulator 2 input ends connect input power 1, and output terminal connects load 3, earth terminal ground connection;
Temperature adjustment module 4, for when electric current surpasses limit value, controls the temperature of three terminal regulator in preset range.
As shown in Figure 5, power supply positive output end connects the anode tap of diode D1, the cathode terminal of diode D1 connects respectively the anode tap of electrochemical capacitor C1 and the input end of three terminal regulator, the cathode terminal of electrochemical capacitor C1 connects the negative pole end of power supply and the earth terminal of three terminal regulator, between the output and ground of three terminal regulator, be parallel with respectively electrochemical capacitor C2, capacitor C 3 and resistance R 1, be also connected with pull-up resistor between the output and ground of three terminal regulator.
Described three terminal regulator can be selected the LM78M05 in LM78XX series, described three terminal regulator is fixed on heating radiator HS1, between described three terminal regulator and heating radiator, be also provided with silicone insulation sheet, electric power output voltage is 8V, shown in Fig. 2, if can be by the suitable heating radiator of design, the junction temperature of three terminal regulator LM78M05CT is controlled between 25 ℃～150 ℃, the output current of three terminal regulator LM78M05CT will be limited in the scope of about 600mA～1000mA, when load short circuits
The maximum power dissipation of three terminal regulator is P
d=(Vin-Vout) * Iout=8V * 1A=8W
Thermal resistance R between three terminal regulator node and air
θ JA=60 ℃/W
Thermal resistance R between three terminal regulator node and shell
θ JC=5 ℃/W
Thermal resistance R between silicone insulation sheet and shell
θ CH=1 ℃/W
So three terminal regulator node is to the thermal resistance R of heating radiator
θ JH=R
θ JC+ R
θ CH=5+1=6 ℃/W;
Temperature difference T=P between three terminal regulator node and heating radiator
d* R
θ JH=8W * 6 ℃/W=48 ℃
Temperature T on heating radiator
ht=150 ℃-48 ℃=102 ℃ of=Tjmax-Δs
The maximum temperature difference Δ T allowing to+70 ℃ of environment temperature atmosphere from spreader surface
h=T
h-T
a=102 ℃-70 ℃=32 ℃
So, the thermal resistance of heating radiator
Or, R
θ HA-5 ℃ of=[(150 ℃-70 ℃)/8W]/W-1 ℃/W=4 ℃/W.
As can be seen here, as long as select the aluminum profile heat radiator of 4 ℃/W of a thermal resistance, in environment temperature-23 ℃～and+70 ℃ of scopes, the output current of three terminal regulator LM78M05CT all can be limited in the scope of 600mA～1000mA.
The embodiment of the present invention provides a kind of current-limiting protection device, though load in long-term short-circuit condition, also can make power supply outputting current steadily be controlled in certain scope, compare with constant-current type current-limiting circuit, simple in structure, overall power dissipation is low.
Embodiment tetra-
A power supply, comprises output rectifier and filter, also comprises above-mentioned current-limiting protection device, and described output rectifier and filter output terminal connects the three terminal regulator of described current-limiting protection device.
The embodiment of the present invention provides a kind of power supply, though load in long-term short-circuit condition, also can make power supply outputting current steadily be controlled in certain scope, compare with constant-current type current-limiting circuit, simple in structure, overall power dissipation is low.
Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (5)
1. a current-limiting protection device, is characterized in that: comprising:
Three terminal regulator, described three terminal regulator input end connects input power, and output terminal connects load, earth terminal ground connection, when the input-output magnitude of voltage of described three terminal regulator is a certain value, the numerical values recited of output current can change along with the variation of three-terminal voltage-stabilizing actuator temperature;
Temperature adjustment module, for when electric current surpasses limit value, controls the temperature of three terminal regulator in preset range;
Described temperature adjustment module is heating radiator, and described three terminal regulator is fixed on heating radiator, and described heating radiator is controlled within the specific limits the output current of three terminal regulator;
Described heating radiator is aluminum profile heat radiator, the resistance that the resistance of described heating radiator calculates when by load short circuits.
2. current-limiting protection device according to claim 1, is characterized in that: between described three terminal regulator and heating radiator, be provided with silicone insulation sheet.
3. current-limiting protection device according to claim 1; it is characterized in that: described temperature adjustment module comprises detecting unit and heat-sink unit; when described detecting unit surpasses limit value for detection of electric current in circuit, heat-sink unit is controlled three-terminal voltage-stabilizing actuator temperature in preset range.
4. current-limiting protection device according to claim 3, is characterized in that: described heat-sink unit is water cooling plant.
5. a power supply, comprises output rectifier and filter, it is characterized in that, also comprises the current-limiting protection device as described in claim 1-4 any one, and described output rectifier and filter output terminal connects the three terminal regulator of described current-limiting protection device.
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| CN201010621278.2A CN102074943B (en) | 2010-12-31 | 2010-12-31 | Current limiting protection device and power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010621278.2A CN102074943B (en) | 2010-12-31 | 2010-12-31 | Current limiting protection device and power supply |
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| CN102074943A CN102074943A (en) | 2011-05-25 |
| CN102074943B true CN102074943B (en) | 2014-03-12 |
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| CN104506034A (en) * | 2014-09-26 | 2015-04-08 | 武汉钢铁(集团)公司 | Continuous adjustable DC stabilized power supply circuit with 0V minimum output voltage based on three terminal regulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757172A (en) * | 1995-06-07 | 1998-05-26 | Acme Electric Corporation | Temperature and current dependent regulated voltage source |
| CN201937464U (en) * | 2010-12-31 | 2011-08-17 | 深圳市大富科技股份有限公司 | Current-limiting protection device and power supply |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5757172A (en) * | 1995-06-07 | 1998-05-26 | Acme Electric Corporation | Temperature and current dependent regulated voltage source |
| CN201937464U (en) * | 2010-12-31 | 2011-08-17 | 深圳市大富科技股份有限公司 | Current-limiting protection device and power supply |
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Address after: 518104, Guangdong, Shenzhen province Baoan District manhole Street oyster road manhole Industrial Company Third Industrial Zone A1, A2, A3 101 and 2 layers, A4 Applicant after: Shenzhen Tat Fook Technology Co., Ltd. Address before: 518108 Guangdong city of Shenzhen province Baoan District alqun Shiyan road with rich industrial area 1-2 building Applicant before: Shenzhen Tat Fook Technology Co., Ltd. |
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Effective date of registration: 20180807 Address after: 233400 Huaiyuan County Economic Development Zone, Bengbu, Anhui Patentee after: Anhui Dafu Electromechanical Technology Co., Ltd. Address before: 518104 Floors 101, 2 and A4 of A1, A2, A3 of Shajing Street, Shajing Street, Shajing Road, Shajing Industry Co., Ltd. No. 3 Industrial Zone, Shenzhen City, Guangdong Province Patentee before: Shenzhen Tat Fook Technology Co., Ltd. |