CN102751705A - Electronic device with overvoltage protection and overvoltage protection method thereof - Google Patents
Electronic device with overvoltage protection and overvoltage protection method thereof Download PDFInfo
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- CN102751705A CN102751705A CN2012102522219A CN201210252221A CN102751705A CN 102751705 A CN102751705 A CN 102751705A CN 2012102522219 A CN2012102522219 A CN 2012102522219A CN 201210252221 A CN201210252221 A CN 201210252221A CN 102751705 A CN102751705 A CN 102751705A
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Abstract
The invention discloses an automatic protection circuit of a charging device and an automatic protection method, and particularly relates to the automatic protection circuit of the charging device. The automatic protection circuit of the charging device comprises a voltage sensing device, a first switch circuit and a second switch circuit, wherein the first switch circuit is coupled between a first voltage supply source and a main system of an electronic device for conducting according to a first state of an indication signal to provide first supply voltage to the main system; the voltage sensing device is used for sensing a voltage value of the first supply voltage to generate a sensing result, and outputting the indication signal according to the sensing result; the second switch circuit is coupled between a second voltage supply source and the main system for conducting according to a second state of the indication signal to provide second supply voltage supplied by the second voltage supply source to the main system; the first voltage supply source is an external voltage supply source of the electronic device, and the second voltage supply source is an internal voltage supply source of the electronic device. The automatic protection circuit can prevent a user from damaging a computer due to use of a wrong transformer.
Description
The application be that February 10, application number in 2009 are 2009100051905 the applying date, denomination of invention divides an application for the application of " automatic protection circuit of charging device and its method ".
Technical field
The present invention is about a kind of automatic protection circuit of charging device, especially in regard to a kind of automatic protection circuit that is applicable to the charging device of single battery unit (single cell battery).
Background technology
The tradition mobile computer is typically designed to the rechargeable battery that uses 4 battery units (4cell) or 6 battery units (6cell), so its supply voltage is generally 19 volts even higher.Yet because the portability of mobile computer comes into one's own gradually in recent years, therefore the demand of mini mobile computer (having the panel or the weight below 2 kilograms that are less than or equal to 10 inches usually) also begins quick growth.For the volume and the weight of saving mobile computer, rechargeable battery be designed to a big Consideration.Generally speaking, when using single rechargeable battery unit, the required supply voltage of mobile computer is about 4 volts, and it is less than 19 volts of traditional mobile computer.Once the user will be applicable to that too high voltage can cause the damage of computer-internal element when the transformer of the traditional mobile computer that receives 19 volts was coupled to single rechargeable battery unit of use mobile computer.On the other hand, if the user will supply transformer that voltage is lower than 4 volts when being coupled to single rechargeable battery unit of use mobile computer, low excessively voltage also possibly cause short circuit, can cause the damage of computer-internal element equally.
Therefore, need a kind of automatic protection circuit that is applicable to single battery unit (single cell battery) charging device, cause computer to damage because of using wrong transformer in order to the prevention user.
Summary of the invention
The present invention provides a kind of automatic protection circuit of charging device, comprises first switching circuit, device for detecting voltage and second switch circuit.First switching circuit is coupled between the main system of the first voltage source of supply and electronic installation, in order to the first state conducting according to index signal, to provide the first supply voltage that the first voltage source of supply supplied to main system.Device for detecting voltage is detected the result in order to the voltage range of detecting the first supply voltage to produce one, and exports index signal according to the detecting result.The second switch circuit; Be coupled between the second voltage source of supply and the main system; In order to the second state conducting according to index signal; With second supply voltage to the main system that provides the second voltage source of supply to be supplied, wherein the first voltage source of supply is an external voltage source of supply of electronic installation, and the second voltage source of supply is a builtin voltage source of supply of electronic installation.
The present invention also provides a kind of automatic protecting method of charging device; In order to protect the charging device of an electronic installation; Wherein this electronic installation optionally is coupled to one first voltage source of supply or one second voltage source of supply; This first voltage source of supply is an external voltage source of supply of this electronic installation, and this second voltage source of supply is a builtin voltage source of supply of this electronic installation.The automatic protecting method of charging device comprises: this first voltage source of supply receives one first supply voltage certainly; Judge that this first supply voltage is whether between a voltage range; And when this first supply voltage is between this voltage range, provide this first supply voltage, and when this first supply voltage is not between this voltage range, do not provide this first supply voltage to this electronic installation to this electronic installation.
The present invention provides a kind of electronic installation with overvoltage protection in addition, comprising: a cell apparatus; One device for detecting voltage is detected the result in order to the magnitude of voltage of detecting a supply voltage to produce one, and is exported an index signal according to this detecting result; An and charging device; One first this cell apparatus of State Control in order to according to this index signal is supplied voltage charging according to this; And according to one second this cell apparatus of State Control of this index signal according to this supply voltage charging; Wherein when this supplied voltage greater than one first critical voltage or less than one second critical voltage, this index signal had this second state, and when this supply voltage is between above-mentioned first critical voltage and above-mentioned second critical voltage; This index signal has this first state, and wherein above-mentioned first critical voltage is greater than above-mentioned second critical voltage.
The present invention provides a kind of over-voltage protection method of cell apparatus of electronic installation in addition, comprising: receive a supply voltage from a voltage source of supply; Whether the magnitude of voltage of judging this supply voltage is between a voltage range; And when this supply voltage is between this voltage range, controls this cell apparatus and supply voltage charging, and when this supply voltage is not between this voltage range, control this cell apparatus not according to this supply voltage charging according to this.
The present invention can prevent the user to cause computer to damage because of using wrong transformer.
Description of drawings
Fig. 1 shows the automatic protection circuit according to the described charging device of one embodiment of the invention.
Fig. 2 is the internal circuit diagram that shows according to the automatic protection circuit of the described charging device of one embodiment of the invention.
Fig. 3 is the internal circuit diagram that shows according to the described voltage detection circuit of one embodiment of the invention.
Fig. 4 shows according to the described automatic protecting method flow chart in order to the charging device of protecting an electronic installation of one embodiment of the invention.
Embodiment
For making manufacturing of the present invention, method of operation, target and the advantage can be more obviously understandable, hereinafter is special lifts several preferred embodiments, and cooperates appended graphicly, elaborates as follows.
Embodiment
Fig. 1 is the automatic protection circuit that shows according to the described charging device of one embodiment of the invention.One electronic installation 100 comprises automatic protection circuit 101 (hereinafter to be referred as automatic protection circuit 101), a main system 102, a cell apparatus 103 and a charging device 104 of a charging device.Electronic installation can be a computer installation; A mobile computer for example; Main system 102 can be to comprise an inner chip of electronic installation and a system of circuit; For example comprise South Bridge chip, north bridge chips, central processing unit etc., and cell apparatus 103 can be the cell apparatus that electronic installation inside has single battery unit (single cell).104 of charging devices charge according to outside supply-voltage source in order to control cell apparatus 103.Automatic protection circuit 101 can be detected the magnitude of voltage of the outside supply voltage that is supplied to electronic installation 100, causes electronic installation to damage with power supply to the electronic installation of avoiding providing too high or too low.Automatic protection circuit 101 comprises switching circuit 111,113 and device for detecting voltage 112.Switching circuit 111 is coupled between the main system 102 of external voltage source of supply (for example, devices such as a power line, a transformer) and electronic installation, in order to according to an index signal S
INDOne first state conducting, so that the external voltage supply voltage V that source of supply is supplied to be provided
ADPTo main system 102.Device for detecting voltage 112 is in order to detecting supply voltage V
ADPMagnitude of voltage with produce one the detecting result, and according to the detecting result export index signal S
INDSwitching circuit 113 is coupled between cell apparatus 103 and the main system 102, in order to according to index signal S
INDOne second state conducting, with the supply voltage V that provides cell apparatus 103 to be supplied
BATTo main system 102.In addition, device for detecting voltage 112 also can correspondingly produce a charging signals S
AC_INTo charging device 104, charge according to outside supply-voltage source simultaneously in order to control cell apparatus 103.
According to one embodiment of the invention, device for detecting voltage 112 comprises stable-pressure device 201 and voltage detection circuit 202.Stable-pressure device 201 is in order to receive supply voltage V
ADP, and the corresponding output voltage V that produces
Z Voltage detection circuit 202 is in order to according to output voltage V
ZProduce two changing voltage V
1With V
2, and according to changing voltage V
1With V
2An and reference voltage V
REFProducing should the detecting result.
Fig. 2 is the internal circuit diagram that shows according to the automatic protection circuit of the described charging device of one embodiment of the invention.Automatic protection circuit 101A comprises switching circuit 111A, 113A and device for detecting voltage 112A.Device for detecting voltage 112A comprises stable-pressure device 201A and voltage detection circuit 202A.According to one embodiment of the invention; Stable-pressure device 201A can be a diode 211, a Zener (Zener) diode for example, the contrary external voltage source of supply that is connected to; As shown in the figure, diode 211 has that a negative electrode is coupled to the external voltage source of supply and an anode is coupled to earth point.Switching circuit 111A comprises that switching device 203A is coupled between external voltage source of supply and the main system 102 (with reference to figure 1), and switching device 204A is coupled between switching device 203A and the voltage detection circuit 202A.And switching circuit 113A comprises that a switching device 205A is coupled to (with reference to figure 1) between main system 102 and the cell apparatus 103.
According to one embodiment of the invention; Switching device 203A can be a PMO S transistor 213; Has two-end-point respectively in order to couple external voltage source of supply and main system 102; And switch 204A is a nmos pass transistor 214, and coupled in parallel one resistance R is between the grid and earth point of PMOS transistor 213, in order to the conducting state according to index signal control PMOS transistor 213.And switching device 205A can be a PMOS transistor 215.It should be noted that; Above-described transistor AND gate transistor kind is only in order to explain a preferred embodiment of the present invention, is not in order to limiting scope of the present invention, has the knack of this art and is total to knowledge as any; Switching device also can be other element or according to any Logic Circuit Design; Therefore do not breaking away from the spirit and scope of the present invention, when doing a little change and retouching, protection scope of the present invention is as the criterion when looking claims person of defining.In addition; It should be noted that because in fact switching circuit 111A and 113A can use any Logic Circuit Design, therefore according to another embodiment of the present invention; Voltage detection circuit 202A can be to the turn-on logic demand of different switching circuits 111A and 113A, according to index signal S
INDThe corresponding two control signal S that produce
ACG, S
BTGIn order to difference control switch circuit 111A and 113A, so the present invention is not limited to use one or more indication/control signals.
According to one embodiment of the invention, by the diode 211 contrary external voltage sources of supply that are connected to, as supply voltage V
ADPDuring less than the puncture voltage of diode 211, output voltage V
ZCan be equal to supply voltage V substantially
ADPFor example, as supply voltage V
ADPMagnitude of voltage (for example, V when meeting the operating voltage of electronic installation 100
ADP=5 volts), output voltage V
ZCan be equal to 5 volts substantially.At this moment, voltage detection circuit 202A detects output voltage V
ZIn the set operating voltage range of electronic installation 100 (for example, 4～6 volts), therefore export index signal S with high signal level
IND, or two control signal S with high signal level
ACGWith S
BTGControl signal S with high signal level
ACGBut turn-on transistor 214, and and then through transistor 214 turn-on transistors 213.Therefore, when detecting, automatic protection circuit 101 supplies voltage V
ADPMagnitude of voltage between the set operating voltage range of electronic installation 100 time, automatic protection circuit 101 provides supply voltage V
ADPTo electronic installation.At this moment, because control signal S
BTGHave high signal level equally, therefore can turn-on transistor 215, so the supply voltage V of cell apparatus 103
BAT-can not be supplied to electronic installation.In addition, voltage detection circuit 202A also can correspondingly produce a charging signals S
AC_INTo the charging device 104 of electronic installation, in order to indication mechanism correct outside supply-voltage source is arranged at present, charge according to outside supply-voltage source simultaneously with control cell apparatus 103.
As supply voltage V
ADPMagnitude of voltage (for example, V during less than the operating voltage of electronic installation 100
ADP=3 volts), output voltage V
ZCan be equal to 3 volts substantially.At this moment, voltage detection circuit 202A detects output voltage V
ZNot in the set operating voltage range of an electronic installation 100 (for example, 4～6 volts), therefore export index signal S with low-signal levels
IND, or two control signal S with low-signal levels
ACGWith S
BTGControl signal S with low-signal levels
ACGCan turn-on transistor 214 and 213.Therefore, when detecting, automatic protection circuit 101 supplies voltage V
ADPMagnitude of voltage during less than the set operating voltage of electronic installation 100, automatic protection circuit 101 does not provide supply voltage V
ADPTo electronic installation, can not cause short circuit in order to the inner member of protecting electronic installation, and then cause the corrupted of electronic installation because of low excessively supply voltage.At this moment, because control signal S
BTGHave low-signal levels equally, so transistor 215 can be switched on, so with the supply voltage V of cell apparatus 103
BAT-be supplied to electronic installation.Simultaneously, charging signals S
AC_IN-have the signal level of a correspondence equally, there is not correct outside supply-voltage source at present in order to indication mechanism, the control cell apparatus will can not charge for 103 this moments.
On the other hand, by the diode 211 contrary external voltage sources of supply that are connected to, as supply voltage V
ADPMagnitude of voltage during greater than the puncture voltage of diode 211, the contrary diode that connects 211 can puncture, and produces corresponding output voltage values.For example, as supply voltage V
ADP(for example, V when being higher than the operating voltage of electronic installation 100
ADP=19 volts), output voltage V
ZCan because of the diode 211 that punctures substantially between 7～8 volts.At this moment, voltage detection circuit 202A detects output voltage V
ZMagnitude of voltage (for example, 4～6 volts) not in the set operating voltage range of electronic installation 100, the therefore index signal S of output with low-signal levels
IND, or two control signal S with low-signal levels
ACGWith S
BTGControl signal S with low-signal levels
ACGCan turn-on transistor 214 and 213.Therefore, when detecting, automatic protection circuit 101 supplies voltage V
ADPMagnitude of voltage during greater than the set operating voltage of electronic installation 100, automatic protection circuit 101 does not provide supply voltage V equally
ADPTo electronic installation, can not cause burning of inner member because of too high supply voltage in order to the inner member of protecting electronic installation.At this moment, because control signal S
BTGHave low-signal levels equally, so transistor 215 can be switched on, so with the supply voltage V of cell apparatus 103
BAT-be supplied to electronic installation.Simultaneously, charging signals S
AC_IN-have the signal level of a correspondence equally, there is not correct outside supply-voltage source at present in order to indication mechanism, therefore, the control cell apparatus will can not charge for 103 this moments.
Fig. 3 is the internal circuit diagram that shows according to the described voltage detection circuit of one embodiment of the invention.Voltage detection circuit 202A comprises voltage conversion circuit 301, comparator 302 and 303 and logical circuit 304.Voltage conversion circuit 301 can be, and a voltage divider for example is in order to the output voltage V according to stable-pressure device 201A
ZProduce changing voltage V
1With V
2Comparator 302 and 303 is coupled to a voltage conversion circuit 301 and a reference voltage generating device (figure does not show); Reference voltage generating device can be logical reference voltage (the bandgap reference voltage) generation device of a band, in order to produce a stable low reference voltage V
REF, for example 1.2 volts.Comparator 302 and 303 is respectively in order to compare changing voltage V
1, V
2And this reference voltage V
REFVoltage swing, and the corresponding comparative result of output respectively.Logical circuit 304 receives comparative result from comparator 302 and 303, and comparative result is carried out logical operation, in order to export the index signal S with corresponding signal level (state) according to comparative result
IND, or control signal S
ACGWith S
BTGAccording to one embodiment of the invention, logical circuit 304 can be according to the input signal coupling mode Flexible Design of comparator 302 and 303, and for example, a comparative result that has a high signal level when comparator 302 outputs is in order to represent changing voltage V
1Greater than reference voltage V
REF, and a comparative result that has a high signal level when comparator 303 output is in order to represent changing voltage V
2Less than reference voltage V
REF-time, logical circuit 304 can be one with gate (AND gate), in order to two comparative results are carried out and computing, to export corresponding index signal S
IND, or control signal S
ACGWith S
BTGIn addition, according to another embodiment of the present invention, the resistance R of voltage conversion circuit 301
1, R
2, R
3Also can be via particular design, can approach the magnitude of voltage (for example, 1.2 volts) of reference voltage after making two critical voltages (for example, 4 volts with 6 volts) of the set operating voltage range that defines electronic installation change respectively via voltage conversion circuit 301.Thus, voltage detection circuit 202A can be designed to work as output voltage V
ZThrough conversion changing voltage V later
1Greater than reference voltage V
REF, and changing voltage V
2Less than reference voltage V
REFThe time (suppose changing voltage V
1>V
2), logical circuit 304 exportable index signal S with first state (the described high signal level of for example above embodiment)
IND, or have the control signal S of respective signal level
ACGWith S
BTG, in order to provide suitable supply voltage to electronic installation.Likewise, work as output voltage V
ZThrough conversion changing voltage V later
1With V
2All greater than reference voltage V
REF, or changing voltage V
1With V
2All less than reference voltage V
REF-time, logical circuit 304 exportable index signal S with second state (the described low-signal levels of for example above embodiment)
IND, or have the control signal S of respective signal level
ACGWith S
BTG, be supplied to electronic installation in order to prevent wrong supply voltage.
Fig. 4 shows according to the described automatic protecting method flow chart in order to the charging device of protecting an electronic installation of one embodiment of the invention.At first, receive a supply voltage (step S401) from an external voltage source of supply.Then, between a voltage range (step S402), this voltage range can be designed in the set opereating specification of this electronic installation the magnitude of voltage of judging supply voltage.At last, when supply voltage is between this voltage range, provide this supply voltage, and when supply voltage is not between this voltage range, this supply voltage to electronic installation (step S403) is not provided to electronic installation.
The above is merely preferred embodiment of the present invention; So it is not in order to limit scope of the present invention; Any personnel that are familiar with this technology; Do not breaking away from the spirit and scope of the present invention, can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
The simple declaration of symbol is following in the accompanying drawing:
100: electronic installation;
101,101A: automatic protection circuit;
102: main system;
103: cell apparatus;
104: charging device;
111,111A, 113,113A: switching circuit;
112,112A: device for detecting voltage;
201,201A: stable-pressure device;
202,202A: voltage detection circuit;
203A, 204A, 205A: switching device;
211: diode;
213,214,215: transistor;
301: voltage conversion circuit;
302,303: comparator;
304: logical circuit;
R, R
1, R
2, R
3: resistance;
S
ACG, S
BTG, S
IND, S
AC_IN: signal;
V
1, V
2, V
ADP, V
BAT, V
REF, V
Z: voltage.
Claims (12)
1. the electronic installation with overvoltage protection is characterized in that, comprising:
One cell apparatus;
One device for detecting voltage is detected the result in order to the magnitude of voltage of detecting a supply voltage to produce one, and is exported an index signal according to this detecting result; And
One charging device is supplied voltage charging in order to one first this cell apparatus of State Control according to this index signal according to this, and does not supply voltage charging according to this according to one second this cell apparatus of State Control of this index signal,
Wherein when this supplies voltage greater than one first critical voltage or less than one second critical voltage; This index signal has this second state; And when this supply voltage is between above-mentioned first critical voltage and above-mentioned second critical voltage; This index signal has this first state, and wherein above-mentioned first critical voltage is greater than above-mentioned second critical voltage.
2. the electronic installation with overvoltage protection according to claim 1 is characterized in that, this device for detecting voltage comprises:
One stable-pressure device should be supplied voltage in order to receive, and the corresponding output voltage that produces; And
One voltage detection circuit; Comprise a voltage conversion circuit; In order to producing one first changing voltage and one second changing voltage according to this output voltage, and this voltage detection circuit produce according to this first changing voltage, this second changing voltage and a reference voltage should the detecting result;
Wherein this first changing voltage is greater than this second changing voltage.
3. the electronic installation with overvoltage protection according to claim 2 is characterized in that, this stable-pressure device is a Zener diode, and this Zener diode has, and a negative electrode is coupled to this supply voltage and an anode is coupled to an earth point.
4. the electronic installation with overvoltage protection according to claim 2 is characterized in that, this voltage detection circuit comprises:
One first comparator is coupled to this voltage conversion circuit, in order to the voltage swing of this first changing voltage and this reference voltage relatively, and exports one first comparative result;
One second comparator is coupled to this voltage conversion circuit, in order to the voltage swing of this second changing voltage and this reference voltage relatively, and exports one second comparative result; And
One logical circuit; Be coupled to this first comparator and this second comparator; In order to according to this index signal of this first comparative result and this second comparative result output, wherein when this reference voltage less than this first changing voltage, and when this reference voltage during greater than this second changing voltage; This logical circuit output has this index signal of this first state; Wherein when this reference voltage greater than this first changing voltage, perhaps when this reference voltage during less than this second changing voltage, this logical circuit is exported has this index signal of this second state.
5. the electronic installation with overvoltage protection according to claim 1; It is characterized in that; More comprise a switching circuit, be coupled between this supply voltage and this charging device, in order to this first state conducting according to this index signal; To provide this supply voltage to this charging device, this this cell apparatus of charging device control is supplied voltage charging according to this.
6. the electronic installation with overvoltage protection according to claim 5 is characterized in that, this switching circuit comprises:
One first switch is coupled between this supply voltage and this charging device; And
One second switch is coupled between this first switch and this device for detecting voltage, wherein when this index signal has this first state, and this first switch and this second switch conducting.
7. the electronic installation with overvoltage protection according to claim 6; It is characterized in that; This first switch is a first transistor; This first transistor has one first end points and one second end points respectively in order to couple this supply voltage and this charging device; And this second switch is a transistor seconds, and this transistor seconds coupled in parallel one first resistance is between one the 3rd end points and this earth point of this first transistor, and this second switch also has one the 4th end points and is coupled to this device for detecting voltage.
8. the electronic installation with overvoltage protection according to claim 1 is characterized in that, this cell apparatus is a single battery unit.
9. the over-voltage protection method of the cell apparatus of an electronic installation is characterized in that, comprising:
Receive a supply voltage from a voltage source of supply;
Whether the magnitude of voltage of judging this supply voltage is between a voltage range; And
When this supply voltage is between this voltage range, controls this cell apparatus and supply voltage charging, and when this supply voltage is not between this voltage range, control this cell apparatus not according to this supply voltage charging according to this.
10. the over-voltage protection method of the cell apparatus of electronic installation according to claim 9 is characterized in that, this voltage range is defined by one first critical voltage and one second critical voltage, and wherein above-mentioned first critical voltage is greater than above-mentioned second critical voltage.
11. the over-voltage protection method of the cell apparatus of electronic installation according to claim 9 is characterized in that, more comprises:
Use a voltage conversion circuit to produce one first changing voltage and one second changing voltage according to this supply voltage, wherein this first changing voltage is greater than this second changing voltage;
The voltage swing of this first changing voltage, this second changing voltage and a reference voltage relatively is to produce a comparative result; And
Produce an index signal according to this comparative result; Wherein work as this reference voltage less than this first changing voltage; And when this reference voltage during greater than this second changing voltage, logical circuit output has this index signal of one first state, supplies voltage charging to control this cell apparatus according to this; When this reference voltage greater than this first changing voltage and this second changing voltage; Perhaps when this reference voltage during less than this first changing voltage and this second changing voltage, this logical circuit output has this index signal of one second state, to control this cell apparatus not according to this supply voltage charging.
12. the over-voltage protection method of the cell apparatus of electronic installation according to claim 9 is characterized in that, this cell apparatus is a single battery unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102522219A CN102751705A (en) | 2009-02-10 | 2009-02-10 | Electronic device with overvoltage protection and overvoltage protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102522219A CN102751705A (en) | 2009-02-10 | 2009-02-10 | Electronic device with overvoltage protection and overvoltage protection method thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100051905A Division CN101478144A (en) | 2009-02-10 | 2009-02-10 | Automatic protective circuit for charging device and method thereof |
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| CN102751705A true CN102751705A (en) | 2012-10-24 |
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| WO2014187017A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Overvoltage protection circuit and electronic device having same |
| CN106484022A (en) * | 2016-10-31 | 2017-03-08 | 广州视源电子科技股份有限公司 | Mainboard overvoltage protection method and system |
| WO2019019272A1 (en) * | 2017-07-24 | 2019-01-31 | 帝奥微电子有限公司 | Power supply protection circuit |
| CN109783282A (en) * | 2017-11-15 | 2019-05-21 | 纬联电子科技(中山)有限公司 | Computer installation and abnormity of power supply detection method |
| CN110704347A (en) * | 2018-05-30 | 2020-01-17 | 联发科技股份有限公司 | Protection circuit for electronic device and related protection method |
| CN111866663A (en) * | 2019-04-24 | 2020-10-30 | 原睿科技股份有限公司 | Control circuit for earplug type earphone device and earplug type earphone circuit |
| CN112054483A (en) * | 2020-08-04 | 2020-12-08 | 上海空间电源研究所 | Simple high-reliability overvoltage protection circuit |
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| WO2014187017A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Overvoltage protection circuit and electronic device having same |
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| CN109783282A (en) * | 2017-11-15 | 2019-05-21 | 纬联电子科技(中山)有限公司 | Computer installation and abnormity of power supply detection method |
| CN109783282B (en) * | 2017-11-15 | 2022-06-28 | 纬联电子科技(中山)有限公司 | Computer device and power supply abnormality detection method |
| CN110704347A (en) * | 2018-05-30 | 2020-01-17 | 联发科技股份有限公司 | Protection circuit for electronic device and related protection method |
| CN110704347B (en) * | 2018-05-30 | 2023-10-13 | 联发科技股份有限公司 | Protection circuit for electronic device and related protection method |
| CN111866663A (en) * | 2019-04-24 | 2020-10-30 | 原睿科技股份有限公司 | Control circuit for earplug type earphone device and earplug type earphone circuit |
| CN112054483A (en) * | 2020-08-04 | 2020-12-08 | 上海空间电源研究所 | Simple high-reliability overvoltage protection circuit |
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Application publication date: 20121024 |