CN103701086A - Circuit protection device - Google Patents
Circuit protection device Download PDFInfo
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- CN103701086A CN103701086A CN201210374787.9A CN201210374787A CN103701086A CN 103701086 A CN103701086 A CN 103701086A CN 201210374787 A CN201210374787 A CN 201210374787A CN 103701086 A CN103701086 A CN 103701086A
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Abstract
The invention discloses a circuit protection device which is applicable to a video image array interface. The circuit protection device comprises a charge pump unit, a first protecting unit, a first switch unit, a second protecting unit and a control unit, wherein the charge pump unit is used for converting working voltage to driving voltage according to an enabling signal; the first protecting unit is used for sensing the temperature of the circuit protecting device and generating temperature protection signals; the first end of the first switch unit is used for receiving the working voltage; the second end of the first switch unit is used for generating an output signal; the third end of the first switch unit is used for receiving a control signal; the second protecting unit is used for sensing the current of the second end of the first switch unit and generating a current protection signal; the control unit is used for generating the control signal according to the enabling signal, the temperature protection signal or the current protection signal.
Description
Technical field
The present invention relates to a kind of circuit protection device, particularly a kind of image figure array interface circuit protection device that is suitable for.
Background technology
In general, the image graphic array configuring on motherboard (Motherboard) (Video Graphic Array, VGA) interface, the most frequent and general in the use, it is in order to connect motherboard and display, so that the image information that motherboard was produced is sent on display and is shown.
In order effectively to protect image figure array interface, conventionally can design a simple protective circuit, effectively to protect the fail safe of image figure array interface.Please refer to shown in Fig. 1, it is the schematic diagram that array imaging graphic interface is connected with protective circuit.At image figure array interface 120 and input voltage VI(, be for example P5V) between, the protective circuit 110 with fuse (Fuse) 111 is set.When electric current is excessive, make the fuse 111 of protective circuit 110 can produce high temperature and fuse, cause open circuit and interruptive current, to protect image figure array interface 120 to avoid coming to harm.
Yet; once there is overcurrent (Over Current), excess temperature (Over Temperature) or reverse voltage (Reverse Voltage); with the fuse 111 of protective circuit 110, possibly cannot reach the effect of effective protection, and may cause image figure array interface 120, motherboard and display damage.Therefore the space that, the protection of image figure array interface is still improved.
Summary of the invention
In view of above problem, the object of the present invention is to provide a kind of circuit protection device, use and effectively prevent reverse voltage, overcurrent or excess temperature, and cause the situation that circuit element damages to occur.
A kind of circuit protection device of the present invention, is suitable for an image figure array interface.This circuit protection device comprises charge pump unit, the first protected location, the first switch element, the second protected location and control unit.Charge pump unit receives operating voltage, and according to enable signal, and convert operating voltage to driving voltage.The first protected location is in order to the temperature of sensing circuit protective device, and according to this temperature and preset temperature, to produce temperature signal.The first switch element has first end, the second end and the 3rd end, the first end of the first switch element receives operating voltage, the second end of the first switch element is in order to produce output signal, the 3rd end reception control signal of the first switch element, and respond control signal and determine whether conducting.The second protective circuit is coupled to the first switch element, in order to an electric current of the second end of sensing the first switch element, and according to this electric current and predetermined current value, with generation current guard signal.Control unit couples charge pump unit, the first protected location, the first switch element and the second protected location; in order to receive driving voltage, enable signal, temperature protection signal and current protection signal; and according to enable signal, temperature protection signal or current protection signal, to produce control signal.
Wherein, when aforementioned temperature is greater than preset temperature, control unit, according to temperature protection signal, produces control signal and disconnects to control the first switch element.And; aforementioned predetermined current value comprises the first threshold values and the second threshold values; and the first threshold values is less than the second threshold values; when aforementioned currents is greater than the first threshold values and is less than the second threshold values; control unit is according to current protection signal; produce control signal to control the first switch element conducting, making output signal is constant current.
In one embodiment, aforementioned when aforementioned currents is greater than the second threshold values, control unit, according to current protection signal, produces control signal and disconnects to control the first switch element.
In one embodiment, aforementioned the second protected location comprises current sensor and current limliting unit.Current sensor couples the second end of the first switch element, in order to the electric current of the second end of sensing the first switch element, with generation current signal.Current limliting unit couples current sensor, in order to received current signal, and compares current value and the predetermined current value of current signal, and generation current guard signal according to this.
In one embodiment, aforementioned circuit protective device also comprises arithmetic logic unit, filter unit and second switch unit.Arithmetic logic unit couples the first protected location and the second protected location, in order to reception and according to temperature protection signal and current protection signal, to produce logical signal.Filter unit couples the output of arithmetic logic unit, with receive logic signal, and logical signal is carried out to filtering, to produce filtering signal.Second switch unit has first end, the second end and the 3rd end, the first end of second switch unit produces warning signal, the second end of second switch unit couples earth terminal, the 3rd end of second switch unit couples filter unit, with the signal that accepts filter, second switch unit determines whether conducting according to filtering signal.
In one embodiment, aforementioned circuit protective device also comprises diode.The anode tap of diode couples the second end of second switch unit, and the cathode terminal of diode couples the first end of second switch unit.
In one embodiment, aforementioned arithmetic logic unit is and door.
In one embodiment, aforementioned the first switch element is power transistor.
Circuit protection device of the present invention; utilize control unit according to enable signal, temperature protection signal or current protection signal; with the conducting of controlling the first switch element whether, effectively to avoid reverse voltage, overcurrent or excess temperature, and to cause the situation that circuit damages to occur.In addition, also further provide the warning signal of overvoltage or overcurrent, make user can learn the situation that circuit protection device occurs, and then carry out relevant subsequent treatment.
Below in conjunction with the drawings and specific embodiments, describe the present invention, but not as a limitation of the invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that image figure array interface is connected with protective circuit;
Fig. 2 is the schematic diagram of circuit protection device of the present invention;
Fig. 3 is the schematic diagram of another circuit protection device of the present invention.
Wherein, Reference numeral
110 protective circuits
111 fuses
120,290 image figure array interfaces
200,300 circuit protection devices
210 charge pump unit
220 first protected locations
230 first switch elements
231,351 first ends
232,352 second ends
233,353 the 3rd ends
240 second protected locations
250 control units
310 current sensors
320 current limliting unit
330 arithmetic logic unit
340 filter units
350 second switch unit
D diode
CS control signal
EN enable signal
VD driving voltage
VI input voltage
VIN operating voltage
VO output signal
S1 temperature protection signal
S2 current protection signal
S3 warning signal
GND earth terminal
Embodiment
In each cited embodiment, the label with identical is represented to same or analogous element below.
Please refer to shown in Fig. 2 its schematic diagram that is circuit protection device of the present invention.The circuit protection device 200 of the present embodiment is suitable for image graphic array (Video Graphics Array; VGA) interface 290, and circuit protection device 200 is for example disposed on the motherboard in a computer system or a server (Server) with image figure array interface 290.
And the pin that charge pump unit 210 receives enable signal EN is negative edge triggering, the pin that also receives enable signal EN disposes an inverter.That is to say, when enable signal EN is high logic current potential, high logic current potential can be converted to via inverter low logic current potential, and making the received enable signal of charge pump unit 210 is low logic current potential.When enable signal EN is low logic current potential, low logic current potential can be converted to via inverter high logic current potential, and making the received enable signal EN of charge pump unit 210 is high logic current potential.
The first protected location 220 is in order to the temperature of sensing circuit protective device 200, and according to this temperature and a preset temperature, to produce temperature protection signal S1.Furthermore, after the first protected location 220 can be compared sensed temperature and aforementioned preset temperature, and produce according to this corresponding temperature protection signal S1.
For instance, when the first protected location 220 is compared out the temperature sensing and is less than preset temperature, produce for example temperature protection signal S1 of low logic current potential.When the first protected location 220 is compared out the temperature sensing and is greater than preset temperature, produce for example temperature protection signal S1 of high logic current potential.
The first switch element 230 has first end 231, the second end 232 and the 3rd end 233, the first end 231 of the first switch element 230 receives operating voltage VIN, the second end 232 of the first switch element 230 is in order to produce output signal VO, the 3rd end 233 reception control signal CS of the first switch element 230, and respond to control news CS and determine whether conducting.
That is to say, when control signal CS is for example high logic current potential, the first switch element 230 conductings, export after making operating voltage VIN be converted to output signal VO.When control signal CS is for example low logic current potential, the first switch element 230 disconnects (i.e. not conducting), makes operating voltage VIN can not convert output signal VO to.
In the present embodiment, aforementioned the first switch element 230 is power transistor.The first end 231 of the first switch element 230 is for example the drain electrode end (Drain) of power transistor, the second end 232 of the first switch element 230 is for example the source terminal (Source) of power transistor, and the 3rd end 233 of the first switch element 230 is for example the gate terminal (Gate) of power transistor.
The second protected location 240 is coupled between second end 232 and image figure array interface 290 of the first switch element 230; electric current in order to the second end 232 of sensing the first switch element 231; and according to this electric current and a predetermined current value, with generation current guard signal S2.Furthermore, after the second protected location 240 can be compared the current value of sensed electric current and aforementioned predetermined current value, and produce according to this corresponding current protection signal S2.In the present embodiment, aforementioned predetermined current value comprises the first threshold values and the second threshold values, and the first threshold values is less than the second threshold values.
For instance, when the current value of comparing out the electric current sensing when the second protected location 240 is less than the first threshold values of predetermined current value, produce for example current protection signal S2 of " 00 ".When the current value of comparing out the electric current sensing when the second protected location 240 is greater than the first threshold values of predetermined current value and is less than the second threshold values of predetermined current value, produce for example current protection signal S2 of " 01 ".When the current value of comparing out the electric current sensing when the second protected location 240 is greater than the second threshold values of predetermined current value, produce for example current protection signal S2 of " 10 ".
And the pin that control unit 250 receives enable signal EN for example disposes an inverter.That is to say, when enable signal EN is high logic current potential, high logic current potential can be converted to via inverter low logic current potential, and making the received enable signal of control unit 250 is low logic current potential.When enable signal EN is low logic current potential, low logic current potential can be converted to via inverter high logic current potential, and making the received enable signal EN of control unit 250 is high logic current potential.
In the present embodiment, when enable signal EN is low logic current potential (being also computer system or server work), the enable signal EN of low logic current potential is converted to the enable signal EN of high logic current potential via inverter, control unit 250 is understood the enable signal EN of corresponding high logic current potential, and produce the control signal CS of high logic current potential, make first to open switch element 230 conductings.Wherein, the magnitude of voltage of control signal CS is identical with the magnitude of voltage of driving voltage VD.
When enable signal EN is high logic current potential (being also that computer system or server are not worked), the enable signal EN of high logic current potential is converted to the enable signal EN of low logic current potential via inverter, control unit 250 is understood the enable signal EN of corresponding low logic current potential, and produce the control signal CS of low logic current potential, make first to open switch element 230 and disconnect.Thus, can effectively avoid the situation of reverse voltage to occur.
In addition; when temperature protection signal S1 is low logic current potential (the temperature of 220 sensings of the first protected location is less than preset temperature); the temperature protection signal S1 of control unit 250 corresponding these low logic current potentials; can not change the logic current potential of control signal CS, make the first still conducting of switch element 230.
When temperature protection signal S1 is high logic current potential (the temperature of 220 sensings of the first protected location is greater than preset temperature); the temperature protection signal S1 of control unit 250 corresponding these high logic current potentials; produce the control signal CS of low logic current potential; make the first switch element 230 disconnect (not conducting), and allow operating voltage VIN can not convert output signal VO to image figure array interface 290.Thus, can effectively avoid excess Temperature and the situation that circuit damages is occurred.
In addition; when current protection signal S2 is " 00 " (the current value of the electric current of 240 sensings of the second protected location is less than the first threshold values of predetermined current value); the current protection signal S2 of control unit 250 corresponding these " 00 "; can not change the logic current potential of control signal CS, make the first still conducting of switch element 230.
When current protection signal S2 is " 01 " (the current value of the electric current of 240 sensings of the second protected location is greater than the first threshold values of predetermined current value and is less than the second threshold values of predetermined current value); control unit 250 corresponding this " 01 " and current protection signal S2; to control the first switch element 230(, be power transistor) enter saturation region; make circuit protection device 100 enter the circuit-mode of constant current (Constant Current); the adjustment output signal VO of take is a constant current, is also the output signal VO that circuit protection device 100 produces constant ionizations.
When current protection signal S2 is " 10 " (current value that the second protected location 240 senses is greater than the second threshold values of predetermined current value); the current protection signal S2 of control unit 250 corresponding these " 10 "; produce the control signal CS of low logic current potential, make the first switch element 230 disconnect (i.e. not conducting).Thus, can effectively avoid electric current too high and the situation that circuit damages is occurred.
Please refer to shown in Fig. 3 its schematic diagram that is another circuit protection device of the present invention.The circuit protection device 300 of the present embodiment is also suitable for image figure array interface 290, and circuit protection device 300 is for example disposed on the motherboard in a computer system or a server with image figure array interface 290.
In the present embodiment, the second protected location 240 comprises current sensor 310 and current limliting (Current Limit) unit 320.Current sensor 310 couples between second end 232 and image figure array interface 290 of the first switch element 230, in order to the electric current of the second end 232 of sensing the first switch element 230, with generation current signal.
For instance, when the current value of comparing out current signal when current limliting unit 320 is less than the first threshold values of predetermined current value, produce for example current protection signal S2 of " 00 ", make control unit 250 control the first switch element 230 conductings.When the current value of comparing out current signal when current limliting unit 320 is greater than the first threshold values of predetermined current value and the second threshold values of little and predetermined current value; produce for example current protection signal S2 of " 01 "; make control unit 250 control the first switch element 230 and enter saturation region; the adjustment output signal VO of take is constant current, and then avoids circuit element to damage because of overcurrent.When the current value of comparing out current signal when current limliting unit 320 is greater than the second threshold values of predetermined current value, produce for example current protection signal S2 of " 10 ", make control unit 250 control the first switch elements 230 and disconnect (i.e. not conducting).
That is to say; when temperature protection signal S1 is that high logic current potential, current protection signal S2 are " 01 " or " 10 "; or temperature protection signal S1 is high logic current potential and current protection signal S2 during simultaneously for " 01 " or " 10 ", the output of arithmetic logic unit 330 can produce the logical signal of high logic current potential.When temperature protection signal S1 is low logic current potential and current protection signal S2 during simultaneously for " 00 ", the output of arithmetic logic unit 330 can produce the logical signal of low logic current potential.
In the present embodiment, second switch unit 350 is for example N-type transistor.The first end 351 of second switch unit 350 is for example the transistorized drain electrode end of N-type, and the second end 352 of second switch unit 350 is for example the transistorized source terminal of N-type, and the 3rd end 353 of second switch unit 350 is for example the transistorized gate terminal of N-type.
When the 3rd end 353 of second switch unit 350 receives the filtering signal of low logic current potential for example, second switch unit 350 can conducting, therefore can not produce warning signal S3.When the 3rd end 353 of second switch unit 350 receives the filtering signal of high logic current potential for example, 350 conductings of second switch unit, 350 of second switch first end 351 couples earth terminal GND by the second end 352, and making warning signal S3 is low logic current potential.
Furthermore, the first end 351 of second switch unit 350 for example couples complexity on motherboard can programmed logic element (Complex Programmable Logic Device, CPLD), the warning signal S3 that second switch unit 350 produces can be sent to complexity can programmed logic element, to process accordingly, for example by warning signal S3 be stored in complexity can the buffer of programmed logic device in, or converting the relevant information of warning signal S3 to display is shown on display.
Therefore, when complexity can programmed logic element receives the warning signal S3 of low logic current potential, user just can or read the information in aforementioned buffer by the shown information of display, and to learn that the situation of overvoltage or excess temperature occurs, user just can carry out relevant subsequent treatment.
In addition, circuit protection device 300 also comprises diode D.The anode tap of diode D couples the second end 352 of second switch unit 350, and the cathode terminal of diode D couples the first end 351 of second switch unit 350.Wherein, diode D is in order to clamp down on respectively pressure drop at the first end 351 of second switch unit 350 and the voltage between the second end 352.
The circuit protection device of embodiments of the invention; it utilizes control unit according to enable signal, temperature protection signal or current protection signal; with the conducting of controlling the first switch element whether, effectively to avoid reverse voltage, overcurrent or excess temperature, and to cause the situation that circuit damages to occur.In addition, also further provide the warning signal of overvoltage or overcurrent, make user can learn the situation that circuit protection device occurs, and then carry out relevant subsequent treatment.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. a circuit protection device, is suitable for an image figure array interface, it is characterized in that, this circuit protection device comprises:
One charge pump unit, receives an operating voltage, and according to an enable signal, and convert operating voltage to a driving voltage;
One first protected location, in order to a temperature of this circuit protection device of sensing, and according to this temperature and a preset temperature, to produce a temperature protection signal;
One first switch element, there is a first end, one second end and one the 3rd end, this first end of this first switch element receives this operating voltage, this second end of this first switch element is in order to produce an output signal, the 3rd termination of this first switch element is received a control signal, and responds this control signal and determine whether conducting;
One second protected location, couples this second end of this first switch element, in order to an electric current of this second end of this first switch element of sensing, and according to this electric current and a predetermined current value, to produce a current protection signal; And
One control unit, couple this charge pump unit, this first protected location, this first switch element and this second protected location, in order to receive this driving voltage, this enable signal, this temperature protection signal and this current protection signal, and according to this enable signal, this temperature protection signal or this current protection signal, to produce this control signal;
Wherein, when this temperature is greater than this preset temperature, this control unit, according to this temperature protection signal, produces this control signal and disconnects to control this first switch element;
Wherein, this predetermined current value comprises one first threshold values and one second threshold values; and this first threshold values is less than this second threshold values; when this electric current is greater than this first threshold values and is less than this second threshold values; this control unit is according to this current protection signal; produce this control signal to control this first switch element, making this output signal is a constant current.
2. this circuit protection device according to claim 1, is characterized in that, when this electric current is greater than this second threshold values, this control unit, according to this current protection signal, produces this control signal and disconnects to control this first switch element.
3. circuit protection device according to claim 1, is characterized in that, this second protected location comprises:
One current sensor, couples this second end of this first switch element, in order to this electric current of this second end of this first switch element of sensing, to produce a current signal; And
One current limliting unit, couples this current sensor, in order to receive this current signal, and compares current value and this predetermined current value of this current signal, and produces according to this this current protection signal.
4. circuit protection device according to claim 1, is characterized in that, also comprises:
One arithmetic logic unit, couples this first protected location and this second protected location, in order to reception and according to this temperature protection signal and this current protection signal, to produce a logical signal;
One filter unit, couples the output of this arithmetic logic unit, to receive this logical signal, and this logical signal is carried out to filtering, to produce a filtering signal; And
One second switch unit, there is a first end, one second end and one the 3rd end, this first end of this second switch unit produces a warning signal, this second end of this second switch unit couples earth terminal, the 3rd end of this second switch unit couples this filter unit, to receive this filtering signal, this second switch unit determines whether conducting according to this filtering signal.
5. circuit protection device according to claim 4, is characterized in that, also comprises:
One diode, its anode tap couples this second end of this second switch unit, and its cathode terminal couples this first end of this second switch unit.
6. circuit protection device according to claim 4, is characterized in that, this arithmetic logic unit be one with door.
7. circuit protection device according to claim 1, is characterized in that, this first switch element is a power transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210374787.9A CN103701086B (en) | 2012-09-27 | 2012-09-27 | Circuit protection device |
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|---|---|---|---|
| CN201210374787.9A CN103701086B (en) | 2012-09-27 | 2012-09-27 | Circuit protection device |
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| CN103701086A true CN103701086A (en) | 2014-04-02 |
| CN103701086B CN103701086B (en) | 2016-03-30 |
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Cited By (1)
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| JP2020039241A (en) * | 2018-09-06 | 2020-03-12 | 三菱電機株式会社 | Semiconductor module and power conversion device |
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Effective date of registration: 20191216 Address after: Within huangwan town government, Jiaxing City, Zhejiang Province Patentee after: Haining huangwan town Asset Management Co.,Ltd. Address before: 201114 Shanghai City Caohejing Export Processing Zone Pu Xing Road No. 789 Co-patentee before: Yingda Co.,Ltd. Patentee before: INVENTEC TECHNOLOGY Co.,Ltd. |
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Application publication date: 20140402 Assignee: Haining Bay Area New Town Investment Development Co.,Ltd. Assignor: Haining huangwan town Asset Management Co.,Ltd. Contract record no.: X2022330000921 Denomination of invention: Circuit protection device Granted publication date: 20160330 License type: Common License Record date: 20221229 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Circuit protection device Effective date of registration: 20231225 Granted publication date: 20160330 Pledgee: Huangwan sub branch of Zhejiang Haining Rural Commercial Bank Co.,Ltd. Pledgor: Haining huangwan town Asset Management Co.,Ltd. Registration number: Y2023980073262 |