CN101499640A - DC electric power protection apparatus and operation method thereof - Google Patents
DC electric power protection apparatus and operation method thereof Download PDFInfo
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- CN101499640A CN101499640A CNA2008100086488A CN200810008648A CN101499640A CN 101499640 A CN101499640 A CN 101499640A CN A2008100086488 A CNA2008100086488 A CN A2008100086488A CN 200810008648 A CN200810008648 A CN 200810008648A CN 101499640 A CN101499640 A CN 101499640A
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Abstract
The invention relates to a direct current power supply protection device and an operation method thereof. The direct current power supply protection device comprises a switch unit, a reverse voltage clamp circuit and a straightforward voltage control unit, wherein the switch unit is connected in series between the anode of the power input end and the anode of load, and used for switching the power provided by the power input end; the reverse voltage clamp circuit is connected with the cathode of the power input end in parallel; when the power input end generates the reverse input voltage, the reverse voltage clamp circuit is used for clamping the reverse input voltage within the rated operating voltage and generating driving signals by the reverse voltage control unit so as to turn off the switch unit; the straightforward voltage control unit is connected with the anode of the power input end in parallel; and when the power input end generates the straightforward input voltage, the straightforward voltage control unit can generate the control voltage to start the switch unit so as to output the supply power. Therefore, the protection device can support the input of wide-range voltage, and achieve the function of protecting the power supply by maintaining the normal operation.
Description
Technical field
The present invention relates to a kind of DC electric power protection apparatus, particularly a kind of DC electric power protection apparatus and How It Works thereof with power supply input of supporting wide-range voltage and big electric current.
Background technology
Because the fast development of science and technology, make that the kind quantity of electronic product is more and more, and most electronic product all is to realize running by the supply of DC power supply, and the stability of power supply supply is enough to influence the key factor of whole electronic product normal operation especially.Therefore,, just always be that each tame manufacturer understands the place of being paid attention in the process of development and Design, avoiding problem, and damage electronic product because of abnormity of power supply at the design aspect of relevant power protection.
Generally speaking, in DC power system, it is that positive and negative electricity is powered according to given line that the mode of load is given in its power supply, but if the polarity of positive and negative electricity produces the situation that is misplaced, just may damage load.To this, aspect the power protection of DC power supply input, can be illustrated in figure 1 as the circuit diagram of a direct current power protecting circuit of known technology.Wherein, the positive and negative electrode of load 9 is respectively to be connected in input power supply V
InPositive and negative electrode, and design has diode D1 to be connected in load 9 and input power supply V
InPositive pole between, with utilize diode D1 input polarity for forward the time conducting input polarity when being reverse the characteristic of not conducting reach the protection effect of the power supply input of reverse polarity.Thus, when the power supply of reverse polarity produced (positive and negative electrode is misplaced), diode D1 just not conducting made circuit form the state of open circuit, uses protection load 9 and can not damaged.
Refer again to Fig. 2, be the circuit diagram of another DC power supply protective circuit of known technology.As shown in the figure, it has more increased the design of another diode D2 and fuse F except circuit structure as shown in Figure 1.Thus, when input polarity for forward the time, diode D1 conducting and not conducting of another diode D2, so but load 9 normal operations; And when input polarity when being reverse, diode not conducting of D1 and another diode D2 conducting makes backward current can flow through fuse F to importing power supply V
InPositive pole, blowout F reaches the effect of the power protection of reverse polarity then.But once the power supply of reverse polarity will blowout F for the every generation of this mode, then just must change fuse F again, thereby cause the inconvenience in the use and the economic benefit of not having.
In addition, with the specification of diode,, all has higher forward conducting voltage (V as the employed diode of the known technology of Fig. 1 and Fig. 2
f), it can't bear the more forward conducting electric current (I that is imported
f), and with the power loss (P=I of diode
f* V
f), the big more then power dissipation of the diode current of flowing through is just big more, and the heat energy that produces is also just high more, if add that heat radiation is bad then easily because of the overheated diode that burns, so the circuit of above-mentioned known technology is suitable for the DC power supply input of big electric current.
So in order to improve this situation, other has known technology to utilize P-type mos field-effect transistor (hereinafter to be referred as the PMOS transistor) to replace diode as switching circuit.Wherein connect the positive pole of importing power supply with the transistorized source electrode of PMOS; And connect the negative pole of importing power supply with the transistorized grid of PMOS, the protection action to switch by this as switch.And, therefore be applicable to the DC power supply input of big electric current because the transistorized conducting resistance of PMOS (RDS (on)) is extremely low.
But; aspect the power protection of the transistorized reverse polarity of PMOS; because being limited in maximum voltage usually, (decides) below 25 volts the transistorized gate-on voltage of PMOS (VGS) according to different rated insulation voltage values; and the transistorized grid of PMOS has the junction capacitance characteristic (Ciss) of input; this characteristic can produce the voltage slope in charging interval thereby produce time of delay, and switching circuit can't cut out immediately.And therefore the also action with regard to closing immediately because of switching circuit when the input of the big voltage that receives reverse polarity, just causes burning of switching circuit or even load easily.On the other hand, aspect the power protection of polarity forward, when the voltage of input for forward and when being in low pressure, voltage at the PMOS transistor gate will be affected, when the just actual voltage that offers grid is low more, the transistorized conducting resistance RDS of PMOS (on) will be high more, and then influence the transistorized on state characteristic of PMOS, increases power loss; And when the voltage of input for forward and when being in high pressure (surpass the transistorized rated insulation voltage value of PMOS), can be subjected to the restriction of its gate-on voltage again and make the PMOS transistor can't normal operation or directly damage.So using the design of the transistorized power protection system of PMOS is to reach the input of supporting wide-range direct current voltage.
Therefore; be known in the problem that exists the input that can't have reception wide-range voltage and big electric current simultaneously on the power protecting circuit because of the restriction of voltage and electric current; allow the product of using described power protecting circuit; its function that can operate can be restricted; for example: the operating voltage of industrial computer often between 9～60 volts of wide-range voltages, just can't form the measure of effective power protection to this.
Summary of the invention
In view of this; technical problem to be solved by this invention is; be used as under the switching circuit of protective effect by P-type mos field-effect transistor (PMOS transistor) equally; design and improvement by hardware circuit; controlled to design different control circuits respectively in the part of voltage and revers voltage forward; make input voltage can not be subjected to the restriction of the transistorized gate-on voltage of PMOS (VGS), and design according to the rated voltage of the voltage between PMOS transistor drain and the source electrode (VDS).By this, allow power protecting circuit be able under the running of big electric current, support the input of wide-range voltage, to keep the effect that normal operation produces power protection.
In order to achieve the above object, a scheme according to proposed by the invention provides a kind of DC electric power protection apparatus, and it comprises: switch element, revers voltage clamp circuit, revers voltage control unit reach forward voltage control unit.Wherein, switch element is serially connected with between the positive pole of the positive pole of power input and load, the power supply that is provided in order to the Switching Power Supply input.And the revers voltage clamp circuit is connected to the negative pole of power input, and when power input produces reverse input voltage, in order to reverse input voltage strangulation in rated operational voltage.Then, the revers voltage control unit is connected in the revers voltage clamp circuit, in order to confirming described reverse input voltage, and is produced drive signal with the off switch unit.At last, forward voltage control unit is connected to the positive pole of power input, and when power input produces forward input voltage, accord with the control voltage in the scope of described rated operational voltage in order to generation, use and open described switch element and export described power supply.
Aforesaid DC electric power protection apparatus, the specification of the switch terminals of the described switch element of wherein said rated operational voltage foundation, and design among described revers voltage clamp circuit and described forward voltage control unit.
Aforesaid DC electric power protection apparatus, wherein said switch element is the P-type mos field-effect transistor, and described switch terminals is the grid of described P-type mos field-effect transistor.
Aforesaid DC electric power protection apparatus, wherein said revers voltage control unit further comprises: the back voltage testing circuit, after receiving and confirming described reverse input voltage, output detection signal; And switch driving circuit, connect described back voltage testing circuit, be converted to described drive signal in order to receive described detection signal, to quicken to close described switch element.
Aforesaid DC electric power protection apparatus, wherein said switch driving circuit further comprises: switching transistor, close described switch element in order to produce described drive signal; And voltage follower, receive described detection signal, and described detection signal is converted in order to driving the amplification drive current of described switching transistor, so that the quick conducting of described switching transistor and quicken to close described switch element.
In order to achieve the above object; according to another scheme proposed by the invention; a kind of How It Works of DC electric power protection apparatus is provided; wherein said DC electric power protection apparatus receives the power supply that power input provided; and come the described power supply of switch to give load by the switch element that described DC electric power protection apparatus comprised; and the step of described How It Works comprises: at first, obtain input voltage, and confirm the polarity of voltage of described input voltage.If when confirming that described input voltage is reverse input voltage; then described reverse input voltage is clamped in the rated operational voltage; and produce drive signal to close described switch element; and if when confirming described input voltage for input voltage forward; then produce control voltage and described power supply is exported to described load to open described switch element; by this, by repeating above-mentioned steps, to finish the running of described DC electric power protection apparatus.
The How It Works of aforesaid DC electric power protection apparatus wherein when confirming that described input voltage is described reverse input voltage, further carries out determining step, whether is higher than described rated operational voltage to judge described reverse input voltage.
The How It Works of aforesaid DC electric power protection apparatus wherein if judge when described reverse input voltage is higher than described rated operational voltage, then is clamped to described reverse input voltage in the described rated operational voltage; And then directly produce described drive signal to close described switch element when described reverse input voltage is less than or equal to described rated operational voltage if judge.
The How It Works of aforesaid DC electric power protection apparatus wherein when confirming that described input voltage is described forward input voltage, further carries out determining step, whether is higher than described rated operational voltage to judge described forward input voltage.
The How It Works of aforesaid DC electric power protection apparatus, wherein if judge when described forward input voltage is higher than described rated operational voltage, then described switch element in described rated operational voltage, opened to form described control voltage with described forward input voltage regulation by elder generation; And then directly form described control voltage to open described switch element when described forward input voltage is less than or equal to described rated operational voltage if judge.
So; the producible effect of DC electric power protection apparatus of the present invention is; it not only can reach the effect of power protection in the system of big electric current running, more can support forward voltage or revers voltage simultaneously when the input of relative broad range voltage, can also normal operation to carry out power protection.
Above general introduction and ensuing detailed description and accompanying drawing all are in order to further specify mode, means and the effect that the present invention takes for the predetermined purpose of realization.And relevant other purpose of the present invention and advantage will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the circuit diagram of the DC power supply protective circuit of known technology;
Fig. 2 is the circuit diagram of another DC power supply protective circuit of known technology;
Fig. 3 is the embodiment circuit block diagram of DC electric power protection apparatus of the present invention;
Fig. 4 A is the schematic equivalent circuit of revers voltage clamp circuit of the present invention;
Fig. 4 B is the output voltage state oscillogram of revers voltage clamp circuit of the present invention;
Fig. 5 is the schematic equivalent circuit of revers voltage control unit of the present invention; And
Fig. 6 is the embodiment flow chart of the How It Works of DC electric power protection apparatus of the present invention.
And each description of reference numerals in the above-mentioned accompanying drawing is as follows:
[known technology]
9 loads
D1, the D2 diode
The F fuse
V
InThe input power supply
[the present invention]
1 DC electric power protection apparatus
11 switch elements
12 revers voltage clamp circuits
13 revers voltage control units
131 back voltage testing circuits
132 switch driving circuits
14 voltage control units forward
2 power inputs
3 loads
D1, the D2 diode
The Q1 transistor
R resistance
The U1 voltage follower
V
SVoltage source
Embodiment
The present invention carries out design improved on hardware circuit; with the forward voltage of power supply input and revers voltage part respectively design have different control circuits to be controlled; make input voltage can not can be subjected to the restriction of switch element; and allow apparatus for protecting power supply be able under the running of big electric current, support the input of wide-range voltage, so that DC electric power protection apparatus is kept the effect that normal operation produces protection.
Please refer to Fig. 3, be the embodiment circuit block diagram of DC electric power protection apparatus of the present invention.As shown in the figure; present embodiment provides a kind of DC electric power protection apparatus 1; it mainly is that design is applied between power input 2 and the load 3, switches by switch in order to detect power supply that power input 2 produced to offer load 3 and use, to reach the effect of protection.
The DC electric power protection apparatus 1 of present embodiment comprises: switch element 11, revers voltage clamp circuit 12, revers voltage control unit 13 reach forward voltage control unit 14.Wherein, switch element 11 mainly is with P-type mos field-effect transistor (P-MOSFET on actual design, hereinafter to be referred as PMOS) design, it is serially connected between the positive pole of the positive pole of power input 2 and load 3, in order to the usefulness of the power supply that provided as Switching Power Supply input 2.
Revers voltage clamp circuit 12 then is the negative pole that is connected to power input 2, when the power supply that produces at power input 2 is reverse input voltage, in order to described reverse input voltage strangulation in rated operational voltage.Wherein, described rated operational voltage is to design among revers voltage clamp circuit 12 according to the specification of the switch terminals of described switch element 11, and described switch terminals promptly is the grid of described PMOS on actual design.
Please be the schematic equivalent circuit and the output voltage state oscillogram thereof of revers voltage clamp circuit of the present invention simultaneously again with reference to figure 4A and Fig. 4 B.Wherein shown in Fig. 4 A, the equivalent electric circuit of revers voltage clamp circuit 12 can for example be to comprise diode D1, resistance R and voltage source V
sFormed equivalent bias circuit, and this equivalent bias circuit can strangulation surpass voltage source V
sThe above voltage of voltage, that is to say to surpass voltage source V
sThe above voltage of voltage can be cut off, and if be less than or equal to voltage source V
sVoltage then can be switched on, and export to revers voltage control unit 13 via diode D1 again.And above-mentioned strangulation principle can be further specified by Fig. 4 B, supposes voltage source V
sVoltage be V1 (just so-called set rated operational voltage), and the reverse input voltage that power supply produced is V2, when the voltage V2 of input is when surpassing the level of V1, then V2 is carried out current potential and end to be clamped at the level of V1 by equivalent bias circuit.By this, make above voltage source V
sThis section input voltage of voltage still can maintain voltage source V
sThe level of voltage V1 export.
So aforementioned mentioned rated operational voltage is that the specification (gate-on voltage VGS) according to the grid of PMOS designs, in the revers voltage clamp circuit 12 of reality, be to utilize the different voltage source V of design
sVoltage form in order to the rated operational voltage of strangulation, with the specification of the gate-on voltage VGS that meets PMOS.In other words, voltage source V
sVoltage be to change design according to the demand of the gate-on voltage VGS of PMOS, to reach the effect that is clamped within the gate-on voltage VGS specification.By this, no matter the formed reverse input voltage of power supply is that great voltage all can be clamped in the scope of rated operational voltage, and can not damages switch element 11 and influence the running of protective device 1.
Then; revers voltage control unit 13 in the DC electric power protection apparatus 1 of present embodiment is to be connected between revers voltage clamp circuit 12 and the switch element 11, and revers voltage control unit 13 further comprises: back voltage testing circuit 131 and switch driving circuit 132.And the back voltage testing circuit 131 of revers voltage control unit 13 by wherein receives described reverse input voltage, and carries out output detection signal after confirming described reverse input voltage.Switch driving circuit 132 then is to connect back voltage testing circuit 131, changes the generation drive signal to receive described detection signal, to quicken to close described switch element 11.
And, can be the schematic equivalent circuit of revers voltage control unit of the present invention more simultaneously with reference to figure 5 about the detailed structure of revers voltage control unit 13.As shown in Figure 5, wherein revers voltage control unit 13 receives reverse input voltage behind 12 clamps of revers voltage clamp circuit by back voltage testing circuit 131, and after confirming as reverse input voltage, produces detection signal and give switch driving circuit 132.Wherein, back voltage testing circuit 131 is testing circuit and the operation principles thereof that can understand for those skilled in the art merely, is not just given unnecessary details at this.Switch driving circuit 132 then can for example be the equivalent electric circuit that comprises voltage follower U1, transistor Q1 and diode D2, utilizing wherein, voltage follower U1 receives the detection signal that back voltage testing circuit 131 is produced, and described detection signal is converted in order to drive the amplification drive current of described transistor Q1, so that described transistor Q1 is able to quick conducting and produces described drive signal, and also make diode D2 conducting and quicken to close described switch element 11.
And because the switch element 11 in the present embodiment is for example to realize with the design of PMOS, and those skilled in the art should understand can have drain junctions electric capacity (Ciss) in PMOS (figure does not show), be used for forming the voltage slope in charging interval, and make the shut-in time of PMOS produce delay.And for fear of damage PMOS or load 3 because of the shut-in time is long, in the present embodiment then be by voltage follower U1 allow transistor Q1 fast conducting quicken charging to the drain junctions electric capacity of PMOS, and then the drain junctions electric capacity that reduces PMOS charges formed time of delay.Allow the PMOS can quick closedown when reverse input voltage forms and produce the effect of reverse protection.In addition, the design of the switch driving circuit 132 of this creation has the characteristic of extremely low conduction impedance, capacitance resistance (RC) charging interval that the internal resistance of minimizing transistor Q1 and the drain junctions electric capacity of PMOS are constituted, the time of delay when closing can further reducing PMOS again.
At last; in Fig. 3; the forward voltage control unit 14 of the DC electric power protection apparatus 1 of present embodiment is the positive pole that is connected to power input 2; the power supply that produces at described power input 2 is during for input voltage forward; open switch element 11 in order to regulate generation control voltage, use for load 3 to export power supply.And forward equally also be that specification according to the gate-on voltage VGS of PMOS designs in the voltage control unit 14, so that the control voltage of the output of regulating can meet rated operational voltage, just as long as just can be adjusted in the scope of rated operational voltage automatically by voltage control unit 14 forward, normally switch element 11 is controlled, allowing forward, the power supply of input voltage can offer load 3 uses smoothly.
So, can clearly learn in the present embodiment by above-mentioned explanation, owing to be to use PMOS to be used as the design of switch element 11, make DC electric power protection apparatus 1 be applied to big electric current.In addition, by revers voltage clamped circuit 12, revers voltage control unit 13 and the forward design of voltage control unit 14, make the power supply received no matter forward or under the reverse situation, the input voltage size of its support all can not be subject to the restriction (below 25 volts) of the gate-on voltage VGS of PMOS, and can be according to drain electrode and the voltage specification VDS between the source electrode (voltage range can be bigger) of PMOS.To reach under the condition of the voltage input of supporting wide region, can carry out the purpose of power protection equally by this.
And, please refer to Fig. 6 at last in order to further specify actual operation situation of the present invention, be the embodiment flow chart of the How It Works of DC electric power protection apparatus of the present invention.The How It Works of the DC electric power protection apparatus 1 that present embodiment provided; wherein DC electric power protection apparatus 1 mainly is the power supply that is provided in order to reception power input 2, and comes the described power supply of switch to use for load 3 by wherein comprising switch element 11.And as shown in Figure 6, the step of described How It Works comprises: at first, after DC electric power protection apparatus 1 receives described power supply, obtain input voltage (S601).Then, confirm the polarity of voltage (S603) of described input voltage, to confirm that power supply is to form forward input voltage or reverse input voltage.
And, then carry out determining step to judge whether described reverse input voltage is higher than rated operational voltage (S605) when if the affirmation result of step (S603) is reverse input voltage.And because the setting of rated operational voltage is the specification of the gate-on voltage VGS of the switch terminals (grid of PMOS) that can meet switch element 11, therefore if the judged result of step (S605) is for being, represent that then reverse input voltage has been higher than the gate-on voltage VGS of the grid of PMOS, therefore carry out the described reverse input voltage of strangulation (S607) in rated operational voltage immediately, and confirm that and then the reverse input voltage after the described strangulation comes quick closedown switch element 11 (S609) to produce drive signal, to avoid damaging switch element 11 or load 3.And if the judged result of step (S605) during for not situation, represent that then the reverse input voltage that is received is the gate-on voltage VGS of being less than or equal to the grid of PMOS, therefore just directly carry out step (S609), come off switch unit 11 after confirming as reverse input voltage, to produce drive signal.By this, prevent reverse input voltage damage load 3, and reach the effect of protection by off switch unit 11 immediately.
And if the affirmation result of step (S603) during for input voltage forward, then further carries out another determining step to judge forward whether input voltage is higher than rated operational voltage (S611).If judged result is for being, represent that then input voltage forward has been higher than the gate-on voltage VGS of the grid of PMOS, thereby possibly can't be opened the switch element 11 of PMOS representative smoothly, perhaps may cause the damage of switch element 11, therefore just regulate described forward input voltage automatically and in rated operational voltage, control voltage (S613) to form, and then open switch element 11 by described control voltage, use (S615) for load 3 with the output power supply.Otherwise, if the judged result of step (S611) is for denying, represent that then forward input voltage is the gate-on voltage VGS of being less than or equal to the grid of PMOS, therefore directly can carry out step (S615), form control voltage with described forward input voltage, the output power supply is given load 3 to open switch element 11.
At last, in step (S609) or (S615) afterwards, then repeated execution of steps (S601) is to continue receiving power supply and subsequent step, to finish the running of DC electric power protection apparatus 1.And the How It Works of present embodiment promptly is in order to when receiving reverse input voltage; carry out off switch unit 11 to stop power supply to load 3; get rid of and when receiving forward input voltage, just open switch element 11 up to unusual or fault so that load 3 is powered.By this, make DC electric power protection apparatus 1 be supported the input of wide-range voltage, and the power protection measure is carried out in load 3.
In sum; the present invention is used as the design of switch element of protective effect except utilizing PMOS; more pass through the design and the improvement of hardware circuit; controlled to design different control circuits respectively in the part of voltage and revers voltage forward; make input voltage can not be subjected to the restriction of the gate-on voltage (VGS) of PMOS, and design according to the drain electrode of PMOS and the rated voltage of the voltage between the source electrode (VDS).By this, allow DC electric power protection apparatus be able under the running of big electric current, support the voltage of relative broad range to import, to keep the effect that normal operation produces power protection.
But, 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, and the variation that any those skilled in the art can consider in the field of the invention easily or modify all can be encompassed in the claim scope that following the present invention defines.
Claims (10)
1, a kind of DC electric power protection apparatus is characterized in that, comprising:
Switch element is serially connected with between the positive pole of the positive pole of power input and load, the power supply that is provided in order to the described power input of switch;
The revers voltage clamp circuit is connected to the negative pole of described power input, and when described power input produces reverse input voltage, in order to described reverse input voltage strangulation in rated operational voltage;
The revers voltage control unit is connected in described revers voltage clamp circuit, in order to confirming described reverse input voltage, and produces drive signal to close described switch element; And
Voltage control unit forward is connected to the positive pole of described power input, when described power input produces forward input voltage, opens described switch element and exports described power supply in order to produce control voltage.
2, DC electric power protection apparatus as claimed in claim 1 is characterized in that, the specification of the switch terminals of the described switch element of described rated operational voltage foundation, and design among described revers voltage clamp circuit and described forward voltage control unit.
3, DC electric power protection apparatus as claimed in claim 2 is characterized in that, described switch element is the P-type mos field-effect transistor, and described switch terminals is the grid of described P-type mos field-effect transistor.
4, DC electric power protection apparatus as claimed in claim 1 is characterized in that, described revers voltage control unit further comprises:
The back voltage testing circuit, after receiving and confirming described reverse input voltage, output detection signal; And
Switch driving circuit connects described back voltage testing circuit, is converted to described drive signal in order to receive described detection signal, to quicken to close described switch element.
5, DC electric power protection apparatus as claimed in claim 4 is characterized in that, described switch driving circuit further comprises:
Switching transistor cuts out described switch element in order to produce described drive signal; And
Voltage follower receives described detection signal, and described detection signal is converted in order to driving the amplification drive current of described switching transistor, so that the quick conducting of described switching transistor and quicken to close described switch element.
6, a kind of How It Works of DC electric power protection apparatus; it is characterized in that; described DC electric power protection apparatus receives the power supply that power input provided, and comes the described power supply of switch to give load by the switch element that wherein comprises, and the step of described How It Works comprises:
Obtain input voltage, and confirm the polarity of voltage of described input voltage;
If when described input voltage is reverse input voltage, then described reverse input voltage is clamped in the rated operational voltage, and the generation drive signal is to close described switch element; And
If described input voltage during for input voltage forward, then produces and controls voltage and to open described switch element described power supply is exported to described load;
By this, by repeating above-mentioned steps, to finish the running of described DC electric power protection apparatus.
7, the How It Works of DC electric power protection apparatus as claimed in claim 6; it is characterized in that; when confirming that described input voltage is described reverse input voltage, further carry out determining step, whether be higher than described rated operational voltage to judge described reverse input voltage.
8, the How It Works of DC electric power protection apparatus as claimed in claim 7 is characterized in that, if judge when described reverse input voltage is higher than described rated operational voltage, then described reverse input voltage is clamped in the described rated operational voltage; And then directly produce described drive signal to close described switch element when described reverse input voltage is less than or equal to described rated operational voltage if judge.
9, the How It Works of DC electric power protection apparatus as claimed in claim 6; it is characterized in that; when confirming that described input voltage is described forward input voltage, further carry out determining step, whether be higher than described rated operational voltage to judge described forward input voltage.
10, the How It Works of DC electric power protection apparatus as claimed in claim 9, it is characterized in that, if judge when described forward input voltage is higher than described rated operational voltage, then described switch element in described rated operational voltage, opened to form described control voltage with described forward input voltage regulation by elder generation; And then directly form described control voltage to open described switch element when described forward input voltage is less than or equal to described rated operational voltage if judge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100086488A CN101499640A (en) | 2008-02-01 | 2008-02-01 | DC electric power protection apparatus and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100086488A CN101499640A (en) | 2008-02-01 | 2008-02-01 | DC electric power protection apparatus and operation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101499640A true CN101499640A (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100086488A Pending CN101499640A (en) | 2008-02-01 | 2008-02-01 | DC electric power protection apparatus and operation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641194B (en) * | 2017-10-11 | 2018-11-11 | 致茂電子股份有限公司 | Power device with wiring safety function |
| CN110890741A (en) * | 2018-09-07 | 2020-03-17 | 法雷奥市光（中国）车灯有限公司 | Circuit, operation method thereof, corresponding car lamp and car |
-
2008
- 2008-02-01 CN CNA2008100086488A patent/CN101499640A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641194B (en) * | 2017-10-11 | 2018-11-11 | 致茂電子股份有限公司 | Power device with wiring safety function |
| CN110890741A (en) * | 2018-09-07 | 2020-03-17 | 法雷奥市光（中国）车灯有限公司 | Circuit, operation method thereof, corresponding car lamp and car |
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