CN100365897C - Voltage regulator with high performance overcurrent protection - Google Patents
Voltage regulator with high performance overcurrent protection Download PDFInfo
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- CN100365897C CN100365897C CNB031287255A CN03128725A CN100365897C CN 100365897 C CN100365897 C CN 100365897C CN B031287255 A CNB031287255 A CN B031287255A CN 03128725 A CN03128725 A CN 03128725A CN 100365897 C CN100365897 C CN 100365897C
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Abstract
The present invention relates to a voltage regulator which belongs to an alternating electric appliance capable of regulating load voltage in a smooth and stepless mode within a large range. A novel voltage regulator with high performance overcurrent protection can be used for automatically monitoring the magnitude of the load current of the voltage regulator; when load current exceeds the rated output current of the voltage regulator, the output of the novel voltage regulator is automatically switched off. People can absorbedly research the experiment principle in the scientific experiment by the protection function; an experiment system can be reduced, an experiment period can be shortened, and the experiment cost can also be reduced. The embodiment of the present invention provides the solid basis for greatly prolonging the service life of the voltage regulator and farthest reducing the application cost and the maintenance cost of the novel voltage regulator.
Description
Technical field under the present invention is a transformer.More particularly, the present invention relates to a kind of not excessive electronic installation that burns of load current of voltage regulator that makes because of exporting.
Background technology of the present invention.Voltage regulator is can be in the in a big way level and smooth infinitely ac electric apparatus of regulating load voltage of a class.The voltage regulator that belongs to transformer type can be subdivided into three kinds of contact, induction type and magnetic voltage regulators.Because it is good that contact type voltage regulator has efficient height, waveform and a voltage adjustment characteristic, volume is little, in light weight, price is low, be widely used in the occasion of the continuous regulation voltages of various needs such as laboratory, back yard industry electric furnace, telecommunication equipment, household electrical appliance, the equal finger touch of said voltage regulator product in the discussion afterwards.Usually, much no matter the voltage of voltage regulator output has, the output-current rating of voltage regulator can be greater than its specified input current.People are when selecting voltage regulator, often according to the size of load current, determine the output-current rating of required voltage regulator, this has just determined the power of voltage regulator indirectly, be limited to reasons such as volume and weight and price, finally the surplus of selected its output-current rating of voltage regulator is all little, and this has just buried hidden danger to burning voltage regulator.In fact, people are to the one-sidedness and the ambiguity of objective things understanding, make that load current and the actual gap estimate are bigger, voltage regulator be can't bear the heavy load, particularly cause load current excessive and to burn the situation of voltage regulator of common occurrence especially by abnormal factors.Usually, people are with some device of voltage regulator support study dies the time, and whether the load current that is difficult to look after voltage regulator output overrate, and this has just increased the probability that burns voltage regulator.On the other hand, if with conventional means the load current of voltage regulator output is monitored, can make so that experimental system is too huge, the experiment table top is mixed and disorderly, this neither be desired.
The objective of the invention is to develop a size of monitoring voltage regulator load current automatically, when load current surpasses the output-current rating of voltage regulator, cut off the electronic installation of voltage regulator output automatically.Utilize this defencive function, people can be in scientific experiment research experiment principle without single devotion, both can reduce experimental system and abbreviation experiment table top, can shorten experimental period again and reduce experimental cost.
Technical scheme of the present invention is an object of protection with the voltage regulator of 0.2KW in the following embodiment that will set forth, and has successfully realized above-mentioned purpose.Introduce this technical scheme and details thereof below in conjunction with embodiment and accompanying drawing; because operation principle of the present invention and voltage regulator and load are closely related; for simplicity; to abbreviate this organic whole as the voltage-regulating system of band overcurrent protection later on, the voltage-regulating system of the band overcurrent protection that does not contain load be abbreviated as the voltage regulator of band overcurrent protection.In the accompanying drawings:
Fig. 1 is the basic calcspar of voltage-regulating system of band overcurrent protection;
Fig. 2 is the voltage-regulating system electrical schematic diagram of band overcurrent protection.
A lot of to the excessive scheme of protecting of voltage regulator output current.Comprehensive various factors, the voltage regulator of band overcurrent protection is made up of parts such as first voltage regulator 1, controlled switch 2, current sampling unit 4, current detecting unit 5, power conversion unit 6, integrating circuit 7, bistable circuits 8.Correlation between them is: the city electrically connects the input of first voltage regulator 1, the input of the 6V output joining power converter unit 6 that first voltage regulator 1 has more than classical voltage regulator, the 1st output of first voltage regulator 1 connects the 1st switch terminal of controlled switch 2, the 2nd switch terminal of controlled switch 2 connects the 1st terminal of load 3, the 2nd terminal of load 3 connects the 1st terminal of current sampling unit 4 and the input of current detecting unit 5, the 2nd terminal of current sampling unit 4 connects the 2nd output of first voltage regulator 1, the output of power conversion unit 6 connects the working power end of current detecting unit 5 and integrating circuit 7 and bistable circuit 8, the output of current detecting unit 5 connects the input of integrating circuit 7, the output of integrating circuit 7 connects the input of bistable circuit 8, and the output of bistable circuit 8 connects the control end of controlled switch 2.Its operation principle is: after first voltage regulator 1 obtains energy from civil power; power to load 3 by controlled switch 2 and current sampling unit 4; power conversion unit 6 is transformed into the 6V alternating current of first voltage regulator 1 output ± two direct voltage sources power supply stream detecting units 5 and the parts uses such as integrating circuit 7 and bistable circuit 8 of 7V; current sampling unit 4 converts the current information in the load 3 to represent the load current size monodrome level and gives current detecting unit 5; current detecting unit 5 is divided into load current information and whether surpasses two parts of predetermined value and send integrating circuit 7 to; 7 pairs in integrating circuit transmits bistable circuit 8 after surpassing the load current information filter of predetermined value, and bistable circuit 8 is controlled opening of controlled switch 2 switch terminals according to the output-current rating whether load current surpasses first voltage regulator 1; thereby off status has determined the output state of the voltage regulator of band overcurrent protection.
Below the detailed content of each functional module is introduced by branch.
First voltage regulator 1 is Duoed the alternating current of tap output 6V than classical voltage regulator, is used for the working power of protective device, so neither can increase burden to the technique for coiling of voltage regulator, can obviously not increase cost again.Concrete technical scheme is as described below.
The live wire of civil power connects the 1st input 11 of first voltage regulator 1, the 2nd input 12 that the zero line of civil power connects first voltage regulator 1 is this machine ground, the cursor slide of first voltage regulator 1 is the 1st switch terminal that its 1st output connects controlled switch 2, the 2nd switch terminal of controlled switch 2 connects the 1st lead-out terminal 13 of the voltage regulator of band overcurrent protection, the 2nd lead-out terminal 14 of the voltage regulator of band overcurrent protection connects the 1st terminal of current sampling unit 4, and this node also is the output of current sampling unit 4; The 2nd terminal of current sampling unit 4 connects the 2nd output and ground connection of first voltage regulator 1, the input of the 6V output joining power converter unit 6 of first voltage regulator 1.Its operation principle is: when system normally moves, and the alternating current of first voltage regulator 1 output, switch terminal by controlled switch 2 and current sampling unit 4 are to load 3 works done.When the operating current of load 3 surpasses the output-current rating of first voltage regulator 1; the switch terminal of controlled switch 2 is by automatic disconnection; therefore the alternating current of first voltage regulator, 1 output can not arrive lead-out terminal 13, and load current disappears thereupon, and first voltage regulator 1 has obtained protection.
Power conversion unit 6.Present embodiment is when normal operation, and the power supply energy that is consumed seldom only needs the 6V alternating current of first voltage regulator, 1 output is transformed into direct current with half-wave rectifying circuit, protective device is done one's duty in high quality, thereby reduced installation cost further.In the present embodiment, power conversion unit 6 is by rectifier diode 15 and 16, and electrochemical capacitor 17 and elements such as 18 are formed.Concrete technical scheme is as described below.
The 6V output of first voltage regulator 1 connects the positive pole of rectifier diode 15 and 16 negative pole, the positive pole of the negative pole connection electrolytic capacitor filter 17 of rectifier diode 15 is Vcc as the node of the positive 7 volts of DC power supply of power conversion unit 6 outputs, the negative pole of the positive pole connection electrolytic capacitor filter 18 of rectifier diode 16 is Vee as the node of the negative 7 volts of DC power supply of power conversion unit 6 outputs, and the zero terminal 12 of first voltage regulator 1 connects the negative pole of electrolytic capacitor filters 17 and 18 positive pole is a ground connection as local reference level GND.Its operation principle is: when civil power is positive half cycle, charging current is from the 6V output of first voltage regulator 1, flow to electrolytic capacitor filter 17 through rectifier diode 15, turn back to the zero terminal 12 of first voltage regulator 1 again, just set up positive voltage Vcc at the positive pole of electrolytic capacitor filter 17 like this and used for protective device; When civil power is negative half period; charging current is from zero terminal 12; flow through rectifier diode 16 through electrolytic capacitor filter 18, turn back to the 6V output of first voltage regulator 1 again, just set up negative voltage Vee at the negative pole of electrolytic capacitor filter 18 like this and used for protective device.
Controlled switch 2.Usually, voltage regulator is that power-supply device as variable output uses.In order to reduce switching loss and the good waveform of output, in the present embodiment, controlled switch 2 is mainly served as by relay 39.For the afterflow characteristic that prevents inductive load produces the arcing phenomenon in relay 39, controlled switch 2 also contains arc extinguishing electric capacity 36.Because during relay 39 actions; its magnet exciting coil needs bigger exciting current; and voltage regulator often operates in normal condition; for application cost and the maintenance cost that reduces system, utilize the state of the 1st lead-out terminal 13 of voltage regulator of the break contact control band overcurrent protection in the relay 39 in the present embodiment.Concrete technical scheme is as described below.
The 1st terminal of relay 39 magnet exciting coils connects dc positive power Vcc; the 2nd terminal that the output of bistable circuit 8 connects relay 39 magnet exciting coils is the control end of controlled switch 2; the 1st switch terminal of controlled switch 2 is that the 1st terminal of relay 39 break contacts connects the 1st terminal of arc extinguishing electric capacity 36 and the 1st output of first voltage regulator 1, and the 2nd switch terminal of controlled switch 2 is the 1st lead-out terminal 13 that the 2nd terminal of relay 39 break contacts connects the voltage regulator of the 2nd terminal of arc extinguishing electric capacity 36 and band overcurrent protection.Its operation principle is: when the voltage regulator of band overcurrent protection normally moves, the output of bistable circuit 8 ends, there is not exciting current in the magnet exciting coil of relay 39, it is that its break contact is in closure state that relay 39 is failure to actuate, and the output of first voltage regulator 1 can arrive by the break contact of relay 39 on the lead-out terminal 13; When load current is excessive, the output conducting of bistable circuit 8 produces exciting current in the magnet exciting coil of relay 39, and relay 39 actions are that its break contact is disconnected, the output of first voltage regulator 1 is blocked between the break contact of relay 39, and load current disappears thereupon; In the moment that relay 39 break contacts are disconnected, transition can not take place because of the existence of the arc extinguishing electric capacity 36 in parallel with it in the voltage between relay 39 break contact two-terminal, has eliminated the arcing phenomenon.
The sampling theorem of current sampling unit 4 is very big to the cost and the volume influence of system, adopts what element to consider as a whole with current detecting unit 5.Adopt a low resistivity value resistor as the current sampling element in the present embodiment.Like this, neither have big power loss, also have favorable linearity characteristic and frequency characteristic, and circuit is simple, volume is little and with low cost.Concrete technical scheme is existing in front to be introduced, and repeats no more here.
The sensitivity of current detecting unit 5 is high more, and system is just low more to the requirement of current sampling; For the time of delay that makes protection action and the degree hook of load current overrate; a simple and practical method is: pre-determine a value; analyze load current and surpass time of this predetermined value in the cycle, judge the overcurrent degree of load current according to this at each power frequency supply.In the present embodiment, current detecting unit 5 is a core with first comparator of two element circuits among the four integrated voltage comparator LM339 of cheapness 25, second comparator 26, comprise element compositions such as resistance 19,20,21,22,23,24, make this device have high P/C ratio.Concrete technical scheme is as described below.
Dc positive power Vcc connects the 1st terminal of first divider resistance 19 and 3 pin of LM339, the 2nd terminal of first divider resistance 19 connects the 1st terminal of second divider resistance 20 and in-phase input end 5 pin of first comparator 25, and this node provides positive predetermined value; The 2nd terminal of second divider resistance 20 connects the 1st terminal and ground connection of the 3rd divider resistance 21, the 2nd terminal of the 3rd divider resistance 21 connects the 1st terminal of the 4th divider resistance 22 and inverting input 6 pin of second comparator 26, and this node provides negative predetermined value; The 2nd terminal of the 4th divider resistance 22 connects 12 pin and the dc negative supply Vee of LM339, the 2nd terminal of first buffer resistance 23 connects inverting input 4 pin of first comparator 25, the 2nd terminal of second buffer resistance 24 connects in-phase input end 7 pin of second comparator 26, the 1st terminal that the 1st terminal of first buffer resistance 23 connects second buffer resistance 24 connects the output of current sampling unit 4 again as the input of current detecting unit 5, and output 2 pin of first comparator 25 connect the output of output 1 pin of second comparator 26 as current detecting unit 5.Its operation principle is: the voltage signal that contains load current information is when current sampling unit 4 is transported to the input of current detecting unit 5, if this voltage signal is greater than positive predetermined value, then the output conducting of first comparator 25 is the output conducting of current detecting unit 5; If this voltage signal is less than negative predetermined value, then the output conducting of second comparator 26 is the also conducting of output of current detecting unit 5; If this voltage signal is not only less than positive predetermined value but also greater than negative predetermined value, then the output of first comparator 25 and second comparator 26 all ends by the output that is current detecting unit 5.
Can filtering false overcurrent of integrating circuit 7 or moment cross flow noise, can produce delay-action effect to real over-current signal again.In the present embodiment, integrating circuit 7 is made up of elements such as integrating resistor 28 and rheostat 31 and integration electrochemical capacitors 27; Rheostat 31 is used to regulate the gain of integrating circuit 7, to change the operating point of protection.Concrete technical scheme is as described below.
The input of integrating circuit 7 is the output that the 1st terminal of integrating resistor 28 connects current detecting unit 5, the negative pole of the 2nd terminal connection integration electrochemical capacitor 27 of integrating resistor 28 and the 2nd terminal of rheostat 31 are as the output of integrating circuit 7, and the positive pole of integration electrochemical capacitor 27 connects the cursor slide and the dc positive power Vcc of rheostat 31.Its operation principle is: during the output conducting of current detecting unit 5, integration current is from positive supply Vcc, turn back to dc negative supply Vee by integration electrochemical capacitor 27 and integrating resistor 28, the level of integration electrochemical capacitor 27 negative poles is by drop-down, its drop-down degree by the output of current detecting unit 5 each power frequency supply in the cycle time of conducting decide; When the output of current detecting unit 5 ended, integration electrochemical capacitor 27 charge stored were by rheostat 31 discharges, and the level of integration electrochemical capacitor 27 negative poles rises to some extent; If integration time constant is much larger than power frequency period, then the ripple of integrating circuit 7 output levels will be very little.
The characteristics whether the state decision controlled switch 2 of bistable circuit 8 sends the protection action are: as long as load current is excessive; bistable circuit 8 just enters another stable state and drives the output that controlled switch 2 cuts off the voltage regulator of band overcurrent protection, is maintained to and presses reset button.In the present embodiment, bistable circuit 8 comprises resistance 29,32,34,35,37 to be that comparator 38 is a core with two element circuits among the four integrated voltage comparator LM339 also, reset button 30, and electrochemical capacitor 33 elements such as grade that reset are formed.Concrete technical scheme is as described below.
The 1st terminal of discharge resistance 29 meets negative supply Vee, and the 2nd terminal of discharge resistance 29 connects 1 terminal of a kind of bamboo of reset button 30, and discharge resistance 29 can prolong the useful life of the electrochemical capacitor 33 that resets; The 1st terminal of first biasing resistor 34 connects positive supply Vcc, the negative pole of electrochemical capacitor 33 of resetting connects the 2nd terminal of second biasing resistor 35 and meets negative supply Vee, the 1st terminal that the 2nd terminal of reset button 30 connects the 2nd terminal of the positive pole of the electrochemical capacitor 33 that resets and first biasing resistor 34 and second biasing resistor 35 also has inverting input 8 pin of comparator 38, and this node provides the rated current reference value; The input of bistable circuit 8 i.e. the output of the 1st terminal connection integrating circuit 7 of the 11 resistance 32, the 2nd terminal of the 11 resistance 32 connects the 1st terminal of positive feedback resistor 37 and in-phase input end 9 pin of comparator 38, and the 2nd terminal of positive feedback resistor 37 connects the output of output 14 pin of comparator 38 as bistable circuit 8.Its operation principle is: after system powered on or presses reset button 30, the level of comparator 38 inverting inputs was lower than the level of comparator 38 in-phase input ends, and the output of comparator 38 ends, and the voltage regulator of band overcurrent protection must be in normal operating condition; If load current is excessive; the signal level that makes the level of integrating circuit 7 output reduce and cause comparator 38 in-phase input ends is during less than the bias level of comparator 38 inverting inputs; the output conducting of comparator 38; upset has taken place in the state of bistable circuit 8, and this will encourage controlled switch 2 to send the protection action.
Of particular note: with the individual unit drives relay (as JZC-22F) among the LM339 is inadequate, and in the present embodiment, the use in parallel of remaining two comparator unit circuit, effect is fine.In addition, the circuit form of bistable circuit 8 and Schmidt circuit are very alike, and value that should careful selection resistance 32,34,35,37 makes it to have the feature of bistable circuit.
The advantage of invention:
(a) stable performance and debugging are simple.First comparator 25, second comparator 26 are played the leading role in by LM339, and the height of its gain makes current detection accuracy only depend on the voltage divider precision of being made up of resistance 19,20,21,22.
(b) cost is low, volume is little, power saving and life-span are long.The current sampling parts only have the resistance that power is little, and its price is very low and volume is small and exquisite; The voltage regulator of band overcurrent protection is when normal operation, and the required operating current of protective device is very little, so can select the electrolytic capacitor filter of low capacity for use; The half wave double voltage rectifying circuit that adopts in power conversion unit 6 makes 1 need of voltage regulator of winning Duo a tap of exporting 6V than classical voltage regulator and gets final product; The voltage regulator of band overcurrent protection is when normal operation, and relay 39 is failure to actuate, and has reduced the number of times of relay 39 actions widely; All these had not only reduced the application cost of system but also had reduced the maintenance cost of system, made increase considerably useful life of voltage regulator of band overcurrent protection.
Realize the best way of invention.Among the embodiment of Jie Shaoing, be to utilize the ready-made commodity that to have bought on the market to realize in front.That practicality of the present invention is stronger in order to make, performance is better, cost is lower, institute takes up space is littler, safeguard that voltage regulator kind simpler, adaptation is more, is necessary to do following improvement again.
Aspect circuit structure, utilize integrated circuit technique that functional part height of the present invention is integrated in the chip, will make very simple and all other technical indicators of raising of its external circuit.In this special chip:
(a) will all be integrated on the chip piece except other element current sampling resistor 4, controlled switch 2, reset button 30, four electrochemical capacitors and the rheostat 31, will reduce the shared space of the present invention greatly, this is very important to low power voltage regulator.
(b) increase bistable driving force, will make the present invention can adapt to various types of voltage regulator.
(c) reference voltage source with current detecting makes reference voltage into, and protective value then of the present invention is subjected to the influence of city's electro-mechanical wave hardly.
Aspect physical structure, the present invention is installed on the fritter circuit board, be embedded in the inside of voltage regulator binding post panel, make them become an organic whole.
Claims (3)
1. be with the voltage regulator of overcurrent protection, comprise first voltage regulator (1), controlled switch (2), current sampling unit (4), current detecting unit (5), power conversion unit (6), integrating circuit (7), bistable circuit (8), it is characterized in that, the city electrically connects the input of first voltage regulator (1), the input of the 6V output joining power converter unit (6) that first voltage regulator (1) has more than classical voltage regulator, the 1st output of first voltage regulator (1) connects the 1st switch terminal of controlled switch (2), the 2nd switch terminal of controlled switch (2) connects the 1st terminal of load (3), the output state of controlled switch (2) decision voltage regulator; The 2nd terminal of load (3) connects the 1st terminal of current sampling unit (4) and the input of current detecting unit (5), the 2nd terminal of current sampling unit (4) connects the 2nd output of first voltage regulator (1), first voltage regulator (1) is powered to load (3) by controlled switch (2) and current sampling unit (4), and current sampling unit (4) convert the current information in the load (3) to represent the load current size monodrome level and give current detecting unit (5); The output of power conversion unit (6) connects the working power end of current detecting unit (5) and integrating circuit (7) and bistable circuit (8), and the 6V alternating current that power conversion unit (6) is exported first voltage regulator (1) is transformed into ± two direct voltage sources of 7V; The output of current detecting unit (5) connects the input of integrating circuit (7), and current detecting unit (5) is divided into load current information the two parts that whether surpass predetermined value; The output of integrating circuit (7) connects the input of bistable circuit (8), and integrating circuit (7) is to surpassing the load current information filter of predetermined value; The output of bistable circuit (8) connects the control end of controlled switch (2), bistable circuit (8) according to load current whether surpass first voltage regulator (1) output-current rating control controlled switch (2) thus the open and close state determined the output state of the voltage regulator of band overcurrent protection.
2. the voltage regulator of the band overcurrent protection described in claim 1, wherein said current detecting unit (5) comprises first comparator (25), second comparator (26) and resistance (19), (20), (21), (22), (23), (24), it is characterized in that, first comparator (25), second comparator (26) is two element circuits in inner four element circuits of integrated circuit LM339, dc positive power Vcc connects the 1st terminal of first divider resistance (19) and 3 pin of LM339, the 2nd terminal of first divider resistance (19) connects the 1st terminal of second divider resistance (20) and in-phase input end 5 pin of first comparator (25), and this node provides positive predetermined value; The 2nd terminal of second divider resistance (20) connects the 1st terminal and ground connection of the 3rd divider resistance (21), the 2nd terminal of the 3rd divider resistance (21) connects the 1st terminal of the 4th divider resistance (22) and inverting input 6 pin of second comparator (26), and this node provides negative predetermined value; The 2nd terminal of the 4th divider resistance (22) connects 12 pin and the dc negative supply Vee of LM339, the 2nd terminal of first buffer resistance (23) connects inverting input 4 pin of first comparator (25), the 2nd terminal of second buffer resistance (24) connects in-phase input end 7 pin of second comparator (26), the 1st terminal that the 1st terminal of first buffer resistance (23) connects second buffer resistance (24) connects the output of current sampling unit (4) again as the input of current detecting unit (5), and output 2 pin of first comparator (25) connect the output of output 1 pin of second comparator (26) as current detecting unit (5); Output conducting when load current information current detecting unit (5) during greater than positive predetermined value or less than negative predetermined value; When the output of load current information current detecting unit (5) during not only less than positive predetermined value but also greater than negative predetermined value ends.
3. the voltage regulator of the band overcurrent protection described in claim 1, wherein said bistable circuit (8) comprises comparator (38) and resistance (29), (32), (34), (35), (37) and reset button (30), the electrochemical capacitor that resets (33), it is characterized in that, comparator (38) is and with two element circuits among the LM339, the 1st terminal of discharge resistance (29) meets negative supply Vee, the 2nd terminal of discharge resistance (29) connects the 1st terminal of reset button (30), and discharge resistance (29) can prolong the useful life of the electrochemical capacitor that resets (33); The 1st terminal of first biasing resistor (34) connects positive supply Vcc, the negative pole of electrochemical capacitor (33) of resetting connects the 2nd terminal of second biasing resistor (35) and meets negative supply Vee, the 1st terminal that the 2nd terminal of reset button (30) connects the 2nd terminal of the positive pole of the electrochemical capacitor (33) that resets and first biasing resistor (34) and second biasing resistor (35) also has inverting input 8 pin of comparator (38), this node both provided the rated current reference value, after the system that can guarantee again powered on or presses reset button (30), the output of comparator (38) was in normal operating condition by i.e. voltage regulator with overcurrent protection; The input of bistable circuit (8) i.e. is the output of the 1st the terminal connection integrating circuit (7) of the 11 resistance (32), the 2nd terminal of the 11 resistance (32) connects the 1st terminal of positive feedback resistor (37) and in-phase input end 9 pin of comparator (38), and the 2nd terminal of positive feedback resistor (37) connects the output of output 14 pin of comparator (38) as bistable circuit (8); When load current is excessive; the signal level of comparator (38) in-phase input end is less than the bias level of its inverting input; the output conducting of comparator (38) is that upset has taken place the state of bistable circuit (8), and this will encourage controlled switch (2) to send the protection action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031287255A CN100365897C (en) | 2003-05-06 | 2003-05-06 | Voltage regulator with high performance overcurrent protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031287255A CN100365897C (en) | 2003-05-06 | 2003-05-06 | Voltage regulator with high performance overcurrent protection |
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| CN1458724A CN1458724A (en) | 2003-11-26 |
| CN100365897C true CN100365897C (en) | 2008-01-30 |
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| CNB031287255A Expired - Fee Related CN100365897C (en) | 2003-05-06 | 2003-05-06 | Voltage regulator with high performance overcurrent protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105262060A (en) * | 2015-10-26 | 2016-01-20 | 成都辰来科技有限公司 | Overload control module for FPGA chip |
| CN108872654A (en) * | 2018-06-04 | 2018-11-23 | 深圳市创银科技股份有限公司 | A kind of three-phase current low pressure acquisition device and acquisition method |
| CN112398082A (en) * | 2020-11-16 | 2021-02-23 | 珠海格力电器股份有限公司 | Electronic current-limiting automatic protection circuit and power supply circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206500U (en) * | 1987-04-09 | 1988-04-20 | 宁波市镇海民生电器厂 | Electronic current-limiting switch |
| JPH1118422A (en) * | 1997-06-13 | 1999-01-22 | Samsung Electro Mech Co Ltd | Circuit for protecting power supply feeding apparatus from overcurrent |
| CN2433758Y (en) * | 2000-06-01 | 2001-06-06 | 丁云明 | Overcurrent protecter |
| JP2002136114A (en) * | 2000-10-20 | 2002-05-10 | Fujitsu Denso Ltd | Inrush current preventing circuit |
-
2003
- 2003-05-06 CN CNB031287255A patent/CN100365897C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206500U (en) * | 1987-04-09 | 1988-04-20 | 宁波市镇海民生电器厂 | Electronic current-limiting switch |
| JPH1118422A (en) * | 1997-06-13 | 1999-01-22 | Samsung Electro Mech Co Ltd | Circuit for protecting power supply feeding apparatus from overcurrent |
| CN2433758Y (en) * | 2000-06-01 | 2001-06-06 | 丁云明 | Overcurrent protecter |
| JP2002136114A (en) * | 2000-10-20 | 2002-05-10 | Fujitsu Denso Ltd | Inrush current preventing circuit |
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| CN1458724A (en) | 2003-11-26 |
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