CN101771258A - Over-current cutting-off power supply and method - Google Patents
Over-current cutting-off power supply and method Download PDFInfo
- Publication number
- CN101771258A CN101771258A CN200810190259A CN200810190259A CN101771258A CN 101771258 A CN101771258 A CN 101771258A CN 200810190259 A CN200810190259 A CN 200810190259A CN 200810190259 A CN200810190259 A CN 200810190259A CN 101771258 A CN101771258 A CN 101771258A
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- signal
- power supply
- magnitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to an over-current cutting-off power supply and a method. The power supply comprises a current detection unit, a voltage comparison unit, a warning unit and a cutting-off power supply unit. The current detection unit outputs a voltage type detection signal according to the current value of a load; the voltage comparison unit compares the voltage value of the detection signal and a preset voltage value so as to output a first drive signal and compares the voltage value of the detection signal and a voltage value corresponding to a rated current so as to output a second drive signal; the warning unit receives the control of the first drive signal to generate a warning signal; and the cutting-off power supply unit receives the second drive signal and outputs a cutting-off power supply signal to cut off the power supply loop of a power consuming system. The invention adopts the detection method of using a sensing component connected in the power supply loop to sense the loop current of the load, thereby effectively reducing the influence of the ambient temperature and greatly improving the safety in power utilization.
Description
Technical field
The present invention relates to a kind of cutting-off power supply and method thereof, relate in particular to a kind of over-current cutting-off power supply and method thereof of load.
Background technology
The power-off protection apparatus that most at present socket expansion product or electrical equipment all can design self-resetting type; when the electric current by protective device surpasses certain value; protective device just can start to cut off current supply circuit, ends the power supply of power supply, to reach the guarantee aim of safe power utilization.
Aforesaid power-off protection apparatus, modal is exactly to adopt the bimetal leaf pattern to make, and by surpass the heat that produces after the specification electric current by the electric current on the bimetal leaf, causes bimetal leaf to produce distortion so that the power supply of protection switch escape cut-off loop; But Push switch can be returned to power supply state again after outage.
Adopt this kind design, when power consumption during near the rated current of design, protective device can't move but power lead has been in febrile state, and this heat will cause the insulation coating layer deterioration of power lead, cause short-circuit risks to increase; In addition, the overcurrent escape protection switch of this kind bimetal leaf pattern has a problem the most serious, is subjected to the influence of ambient temperature very big exactly.With 25 ℃ of ambient temperatures is benchmark, when ambient temperature in 10 ℃～40 ℃ scope, its current specification that produces escape will have ± error of 25% degree, if power lead is with the rated current specifications design, when 1.25 times of electric currents of needs just can produce escape, the power of power lead heating has been about 1.6 times of design load, easier in this case causing danger.
In view of this, thereby the inventor proposes the present invention, to improve the defective of prior art.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of over-current cutting-off power supply and method thereof, it is by sensing load circuit current value, and be converted into the signal of voltage form, when this voltage of signals value exceeds the predeterminated voltage value, drive alarm signal produces in advance, but instant alerts power customer loop current has been approached load limit, must close appliances power source or removal electric loading, when the magnitude of voltage of detection signal greater than with respect to the magnitude of voltage of loop rated current the time, cut off the current supply circuit of this using electricity system, cause unexpected storms to take place to prevent the using electricity system overload.
The present invention discloses a kind of over-current cutting-off power supply, is arranged at a load input terminal.This over-current cutting-off power supply includes a current detecting unit, a voltage comparison unit, a caution unit and by power supply unit.Current detecting unit comprises that a sensing element is equipped on the loop of power supply, with the loop current of sensing power supply, according to the current value of loop current, exports the detection signal of a voltage form; Voltage comparison unit is coupled to this current detecting unit, the size of the magnitude of voltage of this detection signal and a predeterminated voltage value relatively, exporting one first drive signal, and the relatively magnitude of voltage and the size corresponding to the magnitude of voltage of rated current of this detection signal, to export one second drive signal; The caution unit is coupled to this voltage comparison unit, accepts the control of this first drive signal, produces an alarm signal; Be coupled to this voltage comparison unit by power supply unit, receive this second drive signal, to export one by power supply signal, to cut off the current supply circuit of this using electricity system.
The present invention is disclosing a kind of over-current cutting-off method of supplying power to, is applicable to prevent load overload, and comprising provides on the loop that a sensing element is equipped on this using electricity system, to respond to the loop current of this using electricity system, to export a current signal; The signal aspect of changing this current signal is a voltage signal; The size of the magnitude of voltage of the magnitude of voltage of this voltage signal and this loop rated current relatively; And when the magnitude of voltage of this voltage signal exceeded the magnitude of voltage of this loop rated current, output one drove one by power supply unit, to cut off the current supply circuit of this using electricity system by power supply signal.
Detection mode by the loop current of the sensing element inductive load that is equipped on current supply circuit, can effectively reduce degree influenced by ambient temperature, in 0 ℃～50 ℃ range of temperature, the error that the loop rated current detects can drop to ± 5% even ± 3% degree, can adopt jumbo lifting of load electrical safety of this device.
Above general introduction and ensuing detailed description and accompanying drawing all are to reach mode, means and the effect that predetermined purpose is taked in order to further specify the present invention.And relevant other purposes of the present invention and advantage will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the system configuration schematic diagram of disclosed over-current cutting-off power supply;
Fig. 2 is the schematic appearance of one of disclosed over-current cutting-off power supply specific embodiment;
Fig. 3 is the circuit diagram of a specific embodiment of the disclosed first embodiment over-current cutting-off power supply;
Fig. 4 is the flow chart of steps of the disclosed first embodiment over-current cutting-off method of supplying power to;
Fig. 5 is the system configuration schematic diagram for the second disclosed embodiment over-current cutting-off power supply;
Fig. 6 is the circuit diagram of second embodiment of disclosed over-current cutting-off power supply; And
Fig. 7 is the flow chart of steps of the disclosed second embodiment over-current cutting-off method of supplying power to
And the description of reference numerals in the above-mentioned accompanying drawing is as follows:
Using electricity system 10
AC power 12
With electric loading 14
Over-current cutting-off power supply 20
Current detecting unit 202
Driving voltage stabilizing circuit 205
Cut-ff voltage stabilizing circuit 207
By power supply unit 208
Resistance R 1～R7, RA1～RA4
Capacitor C 1～C6
Diode D1～D4
Zener diode ZD1
Current transformer CS
Amplifier U1a, U1b, U1c, U1d
Buzzer BZ
Electromagnet L1
Metal oxide semiconductcor field effect transistor Q1～Q2
Embodiment
See also Fig. 1, this figure is the system configuration schematic diagram of the disclosed first embodiment over-current cutting-off power supply.As shown in Figure 1, over-current cutting-off power supply 20 is arranged at the input of a load 14, is coupled between AC power 12 and the load 14.Described AC power 12 provides the alternating electromotive force that connects from mains system, and then for using same current supply circuit to obtain the single of electric power or all electrical installations, these electrical installations obtain power supply via the closure of current cut-off electric supply installation 20 switches in load 14.
Over-current cutting-off power supply 20 is intended to ensure Electrical Safety, prompting makes the people of electrical appliance control the power consumption of using electric loading 14, therefore, can be made as cut-off current according to the certain proportion of circuit rated current (for example 80%～85%) with electric loading 14, the loop current of over-current cutting-off power supply 20 detection load at any time 14, in case loop current has surpassed this cut-off current, just send caution sound or caution light immediately, prompting is closed the people of electrical appliance or is reduced electrical equipment and use to reduce loop current, when loop current is lower than cut-off current, just stop alarm signal automatically, lead to disaster to prevent electrical overload.And when the circuit electricity consumption surpasses the load current value (100%) of using electric loading 14, then directly cut off power supply supply loop with electric loading 14, wait for that the power customer carries out homing action and just replys power supply.
Over-current cutting-off power supply 20 includes a power conversion unit 200, a detecting unit 202, a voltage comparison unit 204, a driving voltage stabilizing circuit 205, a caution unit 206, a cut-ff voltage stabilizing circuit 207 and by power supply unit 208, and detecting unit 202 has a sensing element 2020 and a signaling conversion circuit 2022.Power conversion unit 200 is coupled to electric loading 14 loops, so as to obtaining alternating electromotive force, and alternating current is converted to direct current, the detecting unit 202, voltage comparison unit 204, driving voltage stabilizing circuit 205, caution unit 206, cut-ff voltage stabilizing circuit 207 of over-current cutting-off power supply 20 inside is provided and uses by power supply unit 208.
Sensing element 2020 can be a noncontact coupling sensing element or a contact sensing element, and when sensing element 2020 was the contact sensing element, sensing element 2020 can be a resistance that is connected in series with current supply circuit, and its resistance value can be below the 10m Ω.When sensing element 2020 was coupled sensing element for noncontact, noncontact coupling sensing element can be a group arbitrary sensing element wherein that a current transformer (Current transformer), a magnetoresistive element or a Hall element are formed.
Described predeterminated voltage value is to cooperate the cut-off current of aforementioned load 14 to set, and its setting means will illustrate with example, wouldn't narrate at this.Described caution unit 206 includes at least one caution element, can be audio elements such as buzzer and loudspeaker, or is light-emitting components such as direct current bulb or light-emitting diode, so as to producing caution sound and/or caution light.
The measurement mode of loop current is if adopt serial connection low-resistance value precision resistance among the loop, when obtaining loop current value by resistance both end voltage difference, can obtain degree of precision the result but can be higher in power loss; Adopt coupling sensing mode element slightly poor on the precision but its advantage is then arranged on consumed power.
For making notion of the present invention more clear and definite, see also Fig. 2, this figure is the schematic appearance of a specific embodiment of disclosed over-current cutting-off power supply.As shown in Figure 2, over-current cutting-off power supply 20 has power supply input pin 280 (N), power supply control input pin 282 (L) and power supply control output pin 284 (L '), insert welding manner with wire bonds or machine plate and be arranged at electric loading 14 inputs, the power supply of a button 286 direct control device opens and closes.Power conversion unit 200, current detecting unit 202, voltage comparison unit 204, driving voltage stabilizing circuit 20, caution unit 206, cut-ff voltage stabilizing circuit 207 and be to be arranged at its inside by power supply unit 208, the loop current of flowing through so as to detection.
Then, please consult Fig. 1 to Fig. 3 simultaneously, Fig. 3 is the circuit diagram of first embodiment of disclosed over-current cutting-off power supply, so as to further illustrating the specific embodiment of the present invention.
As shown in Figure 3, power conversion unit 200 includes the rectification circuit that a resistance R 1, two capacitor C 1～C2, two diode D1～D2 and a Zener diode ZD1 are constituted, and provides over-current cutting-off power supply 20 to use so as to alternating current being converted to direct current.In the current detecting unit 202, sensing element 2020 is equipped between power supply unit 208 and power supply control output pin 284, in Fig. 3, sensing element 2020 is that a noncontact coupling sensing element of being made up of current transformer CS and resistance R 2 is the explanation of implementing, certainly, sensing element 2020 can be substituted by precision resistance R2, magnetoresistive element or the Hall element of low-resistance value, and the precision resistance R2 of low-resistance value directly is serially connected with between power supply unit 208 and power supply control output pin 284.Sensing element 2020 inductions are by the loop current of lead, thereby generation is corresponding to an AC signal of loop current.Signaling conversion circuit 2022 is coupled to sensing element 2020, and signaling conversion circuit 2022 is to be made of jointly an amplifier U1a, resistance R 3～R4 and capacitor C 3, produces the voltage form signals of a filtering noise and amplification, exports the detection signal of a voltage form.
Driving voltage stabilizing circuit 205 is made up of a diode D4, a capacitor C 4 and a metal oxide semiconductcor field effect transistor Q2, by the unidirectional charging maintenance of diode D4 and capacitor C 4 and the on-off action of metal oxide semiconductcor field effect transistor Q2, pulse mode first drive signal that comparing unit 204 is exported stabilizes to fixing high state or low state direct current.Cut-ff voltage stabilizing circuit 207 is made up of a diode D3, a capacitor C 3 and a metal oxide semiconductcor field effect transistor Q1, by the unidirectional charging maintenance of diode D3 and capacitor C 3 and the on-off action of metal oxide semiconductcor field effect transistor Q1, pulse mode second drive signal that comparing unit 204 is exported stabilizes to fixing high state or low state direct current.
Formed by an electromagnet L1 and a mains switch SW by power supply unit 208, when receiving cut-ff voltage stabilizing circuit 207 when exporting second drive signal of direct voltage form stably, absorption action by electromagnet L1 produces mechanism action, in order to cut off the current supply circuit of this load.
The multiple circuit execution mode of over-current cutting-off power supply 20 tools of the present invention.For instance, power conversion unit 200 also can adopt other AC/DC change-over circuits to realize its function except utilizing the above-mentioned rectification circuit of mentioning, and also can directly utilize battery to supply over-current cutting-off power supply 20 required direct current.Moreover, the voltage comparison unit 204 of Fig. 3 is earlier to be converted to voltage signal through current detecting unit 202 as current signal, being sent to voltage comparison unit 204 then controls, yet, be familiar with this operator and also can use other circuit structures, earlier the detection signal that amplifies is made stabilized treatment, remake voltage ratio.Caution unit 206 designs interlock circuit according to the caution element, and the oscillating signal generating circuit of Fig. 4 is applicable to the not buzzer of built-in driver circuit, if the built-in drive circuit of buzzer that adopts, just needn't be again drive with the oscillating signal generating circuit of outside.If adopt light-emitting component as the caution element, caution unit 206 just needs matching design optical element drive circuit to come to produce between driven for emitting lights unit caution light.In addition, also can utilize integrated circuit technique, the main circuit of over-current cutting-off power supply 20 is made on the one chip, thereby simplify its production technology.Therefore, Fig. 3 only is a circuit example of overcurrent alarming device, and so as to operating mechanism of the present invention is described in detail in detail, so it is not in order to limit the scope of the invention.
Below conclude inventive concept and reintroduce over-current cutting-off method of supplying power to into a kind of using electricity system, please consult Fig. 1, Fig. 3 and Fig. 4 simultaneously, Fig. 4 is the flow chart of steps of the disclosed first embodiment over-current cutting-off method of supplying power to.
The over-current cutting-off method of supplying power to is to be applicable to prevent that the load overload, load 14 from being that unlatching by over-current cutting-off power supply 20 switches is coupled to an AC power 12 that AC power 12 is connected by the electric main system.At first, after over-current cutting-off power supply 20 captures AC power 12 via using electricity system, see through power conversion unit 200 and be converted into direct voltage, as step S100.Be equipped on the sensing element 2020 on this current supply circuit, to export a detection signal, as step S102.Is a voltage signal via resistance R 2 with the form of current signal conversion and amplification detection signal, as step S104.
The magnitude of voltage that amplifier U1c compares detectable voltage signals is during greater than reference voltage level, amplifier U1c will export one first drive signal of pulse mode, as step S106, then first drive signal is sent to driving voltage stabilizing circuit 205 and carries out the tranquilization action, as step S108, output has first drive signal of steady d. c. voltage signal to drive caution unit 206 generation alarm signals, as step S110 then.Simultaneously, the magnitude of voltage that amplifier U1b compares detectable voltage signals is during greater than reference voltage level, will export one second drive signal of pulse mode, as step S112, then second drive signal is sent to cut-ff voltage stabilizing circuit 207 and carries out the tranquilization action, as step S114, output has second drive signal of steady d. c. voltage signal then, produce by power supply signal to drive, to cut off current supply circuit, as step S116 by power supply unit 208.
See also Fig. 5, this figure is the system configuration schematic diagram of the disclosed second embodiment over-current cutting-off power supply.The different omission caution unit 206 that are of the described over-current cutting-off power supply 20 of second embodiment with first embodiment, so when the voltage comparison unit 204 relatively magnitude of voltage and the size corresponding to the magnitude of voltage of rated current of detection signals, to export a drive signal.Be coupled to voltage comparison unit 204 by power supply unit 208, receive drive signal, and output is by power supply signal, to cut off the current supply circuit of using electricity system 10.
Please refer to Fig. 3, Fig. 5 and Fig. 6, Fig. 6 is the circuit diagram of second embodiment of disclosed over-current cutting-off power supply, so as to further illustrating the specific embodiment of the present invention.
As shown in Figure 6, the inner member of power conversion unit 200 and current detecting unit 202 and operational mode thereof are identical with the disclosed power conversion unit of first embodiment, no longer repeat at this.
Inner member and operational mode thereof that cut-ff voltage stabilizing circuit 207 reaches by power supply unit 208 are identical with the disclosed power conversion unit of first embodiment, no longer repeat at this.
Below conclude inventive concept and reintroduce over-current cutting-off method of supplying power to into a kind of using electricity system, please consult Fig. 5, Fig. 6 and Fig. 7 simultaneously, Fig. 7 is the flow chart of steps of the disclosed second embodiment over-current cutting-off method of supplying power to.
The over-current cutting-off method of supplying power to is to be applicable to prevent that the load overload, load 14 from being that unlatching by over-current cutting-off power supply 20 switches is coupled to an AC power 12 that AC power 12 is connected by the electric main system.At first, after over-current cutting-off power supply 20 captures AC power 12 via current supply circuit, see through power conversion unit 200 and be converted into direct voltage, as step S200.Being equipped on the sensing element 2020 on the current supply circuit, to export a detection signal, as step S202, is a voltage signal via resistance R 2 with the form of current signal conversion and amplification detection signal, as step S204.
In the step of S204, the voltage signal of being changed by resistance R 2 is sent to the input of amplifier U1a, another input of amplifier U1a then is to be connected in the basic multiplying power that resistance R 3～R4 amplifies with the decision signal, capacitor C 5 can will belong to the high-frequency signal filtering of noise character, and amplifier U1a will export the interchange positive half wave voltage signal after the amplification.Interchange positive half wave voltage signal after the amplification is sent to the input of amplifier U1b, and another input of amplifier U1b is to be connected in resistance R 5 and R6 to capture needed reference voltage.
The magnitude of voltage that compares detectable voltage signals as amplifier U1b is during greater than reference voltage level, will export a drive signal of pulse mode, as step 206, then drive signal sees through cut-ff voltage stabilizing circuit 207 diode D3 and the unidirectional charging maintenance of capacitor C 3 and the on-off action of metal oxide semiconductcor field effect transistor Q1, the pulse mode drive signal of comparing unit 204 outputs is stabilized to fixing high state or low state direct current, export to by power supply unit 208, as step S208, drive by power supply unit 208 and produce by power supply signal, to cut off the current supply circuit of using electricity system, as step S210.
Describe in detail by above example, when knowing disclosed over-current cutting-off power supply and method thereof, during the electricity consumption, when if the current sinking of load exceeds the using electricity system load current value, of the present inventionly will be activated and cut off the current supply circuit of using electricity system, take place because of electrical overload leads to unexpected storms preventing by power supply unit.
The above, only be the detailed description and the accompanying drawing of specific embodiments of the invention, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with following claim scope, any those of ordinary skills in the field of the invention, can think easily and variation or modify and all can be encompassed in the claim scope that following the present invention defines.
Claims (16)
1. an over-current cutting-off power supply is characterized in that, comprising:
One detecting unit comprises that a sensing element is equipped on the current supply circuit, to export the detection signal of a voltage form;
One voltage comparison unit, be coupled to this detecting unit, the size of the magnitude of voltage of this detection signal and a predeterminated voltage value relatively is to export one first drive signal, and the relatively magnitude of voltage and the size corresponding to the magnitude of voltage of rated current of this detection signal, to export one second drive signal;
One caution unit is coupled to this voltage comparison unit, accepts the control of this first drive signal, produces an alarm signal; And
One by power supply unit, is coupled to this voltage comparison unit, receives this second drive signal, and exports one by power supply signal, to cut off this current supply circuit.
2. over-current cutting-off power supply as claimed in claim 1, it is characterized in that, wherein this sensing element is a noncontact coupling sensing element or a contact sensing element, this contact sensing element is a resistance, this noncontact coupling sensing element is to be selected from a group arbitrary sensing element wherein that a current transformer, a magnetoresistive element and a Hall element are formed, when this noncontact coupling sensing element is this current transformer, the loop current of this this current supply circuit of detecting unit sensing, according to the current value of this loop current, to export the detection signal of this voltage form.
3. over-current cutting-off power supply as claimed in claim 2 is characterized in that, wherein this detecting unit also comprises:
One signaling conversion circuit is according to the loop current of this current supply circuit, with the voltage form signals that produces this filtering noise and also amplify, to export the detection signal of this voltage form.
4. as claim 1 or 3 described over-current cutting-off power supplies, it is characterized in that wherein this voltage comparison unit also comprises:
One first comparison circuit is coupled to this detecting unit, with the relatively magnitude of voltage of this detection signal and the size of this predeterminated voltage value, to export this first drive signal; And
One second comparison circuit is coupled to this detecting unit, with the size of the magnitude of voltage of the magnitude of voltage of this detection signal relatively and a loop rated current, to export this second drive signal.
5. over-current cutting-off power supply as claimed in claim 4 is characterized in that, also comprises:
One power conversion unit is coupled to the loop of this using electricity system, is the required electric power of this over-current cutting-off power supply with the electric power of changing this current supply circuit;
One driving voltage stabilizing circuit is coupled to this voltage comparison unit, in order to this first drive signal is converted to d. c. voltage signal stably; And
One cut-ff voltage stabilizing circuit is coupled to this voltage comparison unit, in order to this second drive signal is converted to d. c. voltage signal stably.
6. an over-current cutting-off method of supplying power to is applicable to prevent load overload, it is characterized in that, comprises the following steps:
Provide a sensing element to be equipped on the current supply circuit, to export a detection signal;
Conversion and the form of amplifying this detection signal are a voltage signal;
The size of the magnitude of voltage of this voltage signal and a predeterminated voltage value relatively;
When the magnitude of voltage of this voltage signal exceeds this predeterminated voltage value, drive a caution unit and produce an alarm signal;
The size of the magnitude of voltage of the magnitude of voltage of this voltage signal and a loop rated current relatively; And
When the magnitude of voltage of this voltage signal exceeded the magnitude of voltage of this loop rated current, output one drove one by power supply unit, to cut off the current supply circuit of this using electricity system by power supply signal.
7. over-current cutting-off method of supplying power to as claimed in claim 6 is characterized in that, wherein the signal aspect of this this current signal of conversion is the step of a voltage signal, comprises that also the voltage signal that will amplify carries out the noise filtering action.
8. over-current cutting-off method of supplying power to as claimed in claim 6, it is characterized in that, this step of the size of the magnitude of voltage of the magnitude of voltage of this voltage signal and this loop rated current relatively wherein also comprises and this voltage signal amplified and carries out relatively tranquilization action back output.
9. an over-current cutting-off power supply is arranged at a load input terminal, it is characterized in that, comprising:
One detecting unit comprises that a sensing element is equipped on the current supply circuit, with, export the detection signal of a voltage form;
One voltage comparison unit is coupled to this detecting unit, and the relatively magnitude of voltage of this detection signal and a size corresponding to the magnitude of voltage of rated current are to export a drive signal; And
One by power supply unit, is coupled to this voltage comparison unit, receives this drive signal, and exports one by power supply signal, to cut off this current supply circuit.
10. over-current cutting-off power supply as claimed in claim 9, it is characterized in that, wherein this sensing element is a noncontact coupling sensing element or a contact sensing element, this contact sensing element is a resistance, this noncontact coupling sensing element is to be selected from a group arbitrary sensing element wherein of being made up of a current transformer, a magnetoresistive element and a Hall element, when this noncontact coupling sensing element is this current transformer, the loop current of this this current supply circuit of detecting unit sensing, according to the current value of this loop current, to export the detection signal of this voltage form.
11. over-current cutting-off power supply as claimed in claim 10 is characterized in that, wherein this current detecting unit also comprises:
One signaling conversion circuit according to the loop current of this using electricity system, producing a current signal, is converted to the voltage signal form with the signal aspect of this current signal, to export this detection signal.
12., it is characterized in that wherein this voltage comparison unit also comprises as claim 9 or 11 described over-current cutting-off power supplies:
One comparison circuit is coupled to this detecting unit, with the size of the magnitude of voltage of the magnitude of voltage of this detection signal relatively and this loop rated current, to export this drive signal.
13. over-current cutting-off power supply as claimed in claim 12 is characterized in that, also comprises:
One cut-ff voltage stabilizing circuit is coupled to this voltage comparison unit, in order to this second drive signal is converted to d. c. voltage signal stably; And
One power conversion unit is coupled to the loop of this using electricity system, is the required electric power of this over-current cutting-off power supply with the electric power of changing this current supply circuit.
14. an over-current cutting-off method of supplying power to is applicable to prevent load overload, it is characterized in that, comprises the following steps:
Provide a sensing element to be equipped on this current supply circuit, to export a detection signal;
Conversion and the form of amplifying this detection signal are a voltage signal;
The size of the magnitude of voltage of the magnitude of voltage of this voltage signal and a loop rated current relatively; And
When the magnitude of voltage of this voltage signal exceeded the magnitude of voltage of this loop rated current, output one drove one by power supply unit, to cut off the current supply circuit of this using electricity system by power supply signal.
15. over-current cutting-off method of supplying power to as claimed in claim 14 is characterized in that, wherein the signal aspect of this this current signal of conversion is the step of a voltage signal, comprises that also the voltage signal that will amplify carries out the noise filtering action.
16. over-current cutting-off method of supplying power to as claimed in claim 14, it is characterized in that, this step of the size of the magnitude of voltage of the magnitude of voltage of this voltage signal and this loop rated current relatively wherein also comprises and this voltage signal amplified and carries out relatively tranquilization action back output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810190259A CN101771258A (en) | 2008-12-30 | 2008-12-30 | Over-current cutting-off power supply and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810190259A CN101771258A (en) | 2008-12-30 | 2008-12-30 | Over-current cutting-off power supply and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101771258A true CN101771258A (en) | 2010-07-07 |
Family
ID=42503947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810190259A Pending CN101771258A (en) | 2008-12-30 | 2008-12-30 | Over-current cutting-off power supply and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101771258A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739212A (en) * | 2012-06-29 | 2012-10-17 | 台达电子企业管理（上海）有限公司 | Over-current protection point setting method, system and control device for electronic equipment |
| TWI567396B (en) * | 2014-06-24 | 2017-01-21 | 偉詮電子股份有限公司 | Over-current detection chip, over-current calibration circuit and over-current detection calibration method |
| CN108839581A (en) * | 2018-06-29 | 2018-11-20 | 北京新能源汽车股份有限公司 | Electric car method for controlling power supply, device and equipment |
-
2008
- 2008-12-30 CN CN200810190259A patent/CN101771258A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739212A (en) * | 2012-06-29 | 2012-10-17 | 台达电子企业管理（上海）有限公司 | Over-current protection point setting method, system and control device for electronic equipment |
| CN102739212B (en) * | 2012-06-29 | 2014-12-10 | 台达电子企业管理（上海）有限公司 | Over-current protection point setting method, system and control device for electronic equipment |
| TWI567396B (en) * | 2014-06-24 | 2017-01-21 | 偉詮電子股份有限公司 | Over-current detection chip, over-current calibration circuit and over-current detection calibration method |
| CN108839581A (en) * | 2018-06-29 | 2018-11-20 | 北京新能源汽车股份有限公司 | Electric car method for controlling power supply, device and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105468051B (en) | A kind of temperature controller | |
| CN102752912A (en) | Light-emitting diode (LED) driving circuit | |
| US20100254057A1 (en) | Overload power cut-off device and method thereof | |
| CN102799123B (en) | Load and temperature double-control power supply heat radiating device | |
| CN101211722A (en) | Protection apparatus for air circuit breaker | |
| CN101383083B (en) | Alarming method and alarm thereof | |
| CN107093883B (en) | Protection circuit, wireless power transmission system and overcurrent/short-circuit protection method | |
| CN105556628A (en) | Monitoring circuit for detecting a switching state of an electrical switching contact and method therefor | |
| CN101771258A (en) | Over-current cutting-off power supply and method | |
| CN205883038U (en) | Current foldback circuit and have display screen of this circuit | |
| CN202058993U (en) | An intelligent socket | |
| CN113241740A (en) | Solid-state circuit breaker with arc fault protection | |
| CN202076772U (en) | Intelligent power converter | |
| KR102058400B1 (en) | Apparatus for discriminating instantaneous current in power grid line | |
| CN207977889U (en) | A kind of Switching Power Supply with overload protection function | |
| CN203278688U (en) | Sine-wave inverter facilitating improvement of conversion efficiency and application performance | |
| CN104835685B (en) | Control relay circuit | |
| CN106786394B (en) | Interlock protection circuit | |
| KR101706330B1 (en) | The device to break the loading circuit of an low electric power device by Hall sensor when the over current introduces into the loading circuit | |
| CN104810785B (en) | Electric power acquisition device external loads exploratory current foldback circuit | |
| KR101657228B1 (en) | Apparatus for controlling stand-by power of air conditioner | |
| KR100781131B1 (en) | Solid state relay conbined with electric overcurrent relay | |
| CN207459704U (en) | A kind of breaker | |
| CN110191542B (en) | Temperature protector of LED lamp and mounting process thereof | |
| CN106981859A (en) | A kind of ground line current locking-type earth leakage protective device control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100707 |