CN104037747A - Output over-voltage protection circuit and lamp with over-voltage protection function - Google Patents
Output over-voltage protection circuit and lamp with over-voltage protection function Download PDFInfo
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- CN104037747A CN104037747A CN201310072410.2A CN201310072410A CN104037747A CN 104037747 A CN104037747 A CN 104037747A CN 201310072410 A CN201310072410 A CN 201310072410A CN 104037747 A CN104037747 A CN 104037747A
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Abstract
The embodiment of the invention discloses an output over-voltage protection circuit and a lamp with an over-voltage protection function. The circuit comprises a voltage regulator, a switch and a sampler. The voltage regulator has a voltage regulation end. The absolute value of voltage at the output end of the voltage regulator decreases when the absolute value of voltage at the voltage regulation end decreases. The grounding end of the voltage regulator is connected to a grounding point, the input end of the voltage regulator is used for being connected to a power supply, and the output end of the voltage regulator is used for being connected to a load of the output over-voltage protection circuit. A first end of the switch is connected to the voltage regulation end, a second end of the switch is connected to the grounding point, and a driving end of the switch is connected to the output end of the sampler. The sampler is used for sampling voltage at the output end of the voltage regulator, and outputting a driving signal to cause the switch to be switched on so as to reduce the absolute value of the voltage at the voltage regulation end when the sampled voltage at the output end of the voltage regulator exceeds a voltage limit value. According to the invention, the situation in which output over-voltage causes damage to the load can be avoided.
Description
Technical field
The present invention relates to electronic circuit field, be specifically related to a kind of output overcurrent protective circuit and there is the light fixture of overcurrent protection function.
Background technology
The adjustable voltage-stabilizing device of three ends is a kind of output programmable voltage regulators, comprise three end adjustable output positive voltage voltage-stabilizing devices and the adjustable output negative voltage of three ends voltage-stabilizing device, its output voltage range is large, use simple, therefore the adjustable voltage-stabilizing device of three ends is widely used in electronic circuit, for various DC load provide the direct voltage of plurality of specifications.In the typical application circuit of the adjustable voltage-stabilizing device of three ends, by two non-essential resistances, just output voltage can be set, for the convenient output voltage that regulates the adjustable voltage-stabilizing device of three ends, in practical application, in two non-essential resistances, conventionally there is one to adopt adjustable resistance to replace.
When loose contact appears in adjustable resistance, adjustable resistance is equivalent to open circuit, just likely makes output voltage value of reaching capacity of the adjustable voltage-stabilizing device of three ends, and load damages owing to bearing high pressure.
Summary of the invention
The embodiment of the present invention provides a kind of output overvoltage protection circuit and has had the light fixture of over-voltage protecting function, can avoid output overvoltage to cause the situation that load damages to occur.
The application's first aspect provides a kind of output overvoltage protection circuit, it is characterized in that, comprising: pressurizer, derailing switch and sampler; wherein; described pressurizer comprises voltage-regulation end, when the absolute value of voltage of described voltage-regulation end reduces described in the absolute value of voltage of output end of voltage stabilizer reduce
The earth terminal of described pressurizer is connected to earth point, and the input of described pressurizer is used for being connected to power supply, and the output of described pressurizer is for being connected to the load of described output overvoltage protection circuit;
The first end of described derailing switch is connected to described voltage-regulation end, and the second end of described derailing switch is connected to earth point, and the drive end of described derailing switch is connected to the output of described sampler;
Described sampler is for the voltage of the described output end of voltage stabilizer of sampling, and when the absolute value of voltage that samples described output end of voltage stabilizer surpasses voltage limit value, output drive signal is controlled described derailing switch conducting, thereby reduces the absolute value of voltage of described voltage-regulation end.
In the possible implementation of the first of first aspect, described pressurizer comprises the adjustable output positive voltage of three ends voltage-stabilizing device, the first adjustable resistance and the first resistance, wherein, the adjustable side of described the first adjustable resistance is connected to earth point, the first end of described the first adjustable resistance is connected to the adjustable side of described the first adjustable resistance, the second end of described the first adjustable resistance is connected to the first end of described the first resistance, the first end of described the first resistance is the voltage-regulation end of described pressurizer, the second end of described the first resistance is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device is used for being connected to power supply, the output that the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device is described pressurizer.
In conjunction with the possible implementation of the first of first aspect, in the possible implementation of the second, described sampler comprises the second resistance and the 3rd resistance, the first end of described the second resistance is connected to earth point, the second end of described the second resistance is connected to the first end of described the 3rd resistance, the second end of described the 3rd resistance is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the output that the first end of described the 3rd resistance is described sampler;
The first or the possible implementation of the second in conjunction with first aspect, in the third possible implementation, described derailing switch comprises switching tube, the positive pole of described switching tube is connected to the first end of described the first resistance, the negative pole of described switching tube is connected to earth point, and the driving pin of described switching tube is connected to the first end of described the 3rd resistance.
In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation, described circuit also comprises the first electric capacity, the second electric capacity, the first diode and the second diode, wherein,
The first end of described the first electric capacity is connected to earth point, the second end of described the first resistance that the second end of described the first electric capacity is connected to, the first end of described the second electric capacity is connected to earth point, and the second end of described the second electric capacity is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device;
The anodic bonding of described the first diode is to the second end of described the first electric capacity, the negative electrode of described the first diode is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the anodic bonding of described the second diode is to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, and the negative electrode of described the second diode is connected to the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device.
In the 5th kind of possible implementation of first aspect, described pressurizer comprises the adjustable output negative voltage of three ends voltage-stabilizing device, the second adjustable resistance and the 4th resistance, wherein, the adjustable side of described the second adjustable resistance is connected to earth point, the first end of described the second adjustable resistance is connected to the adjustable side of described the second adjustable resistance, the second end of described the second adjustable resistance is connected to the first end of described the 4th resistance, the second end of described the 4th resistance is connected to the voltage-regulation pin of the adjustable output negative voltage of described three end voltage-stabilizing device, the first end of described the 4th resistance is the voltage-regulation end of described pressurizer, the input pin of the adjustable output negative voltage of described three end voltage-stabilizing device is used for being connected to described power supply, the output that the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device is described pressurizer.
The 5th kind of possible implementation in conjunction with first aspect, in the 6th kind of possible implementation, described sampler comprises the 5th resistance and the 6th resistance, the first end of described the 5th resistance is connected to earth point, the second end of described the 5th resistance is connected to the first end of described the 6th resistance, the second end of described the 6th resistance is connected to the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device, the output that the second end of described the 5th resistance is described sampler.
The 5th kind or the 6th kind of possible implementation in conjunction with first aspect, in the 7th kind of possible implementation, described derailing switch comprises switching tube, the negative pole of described switching tube is connected to the first end of described the 4th resistance, the positive pole of described switching tube is connected to earth point, and the driving pin of described switching tube is connected to the second end of described the 5th resistance.
In conjunction with the 7th kind of possible implementation of first aspect, in the 8th kind of possible implementation, described circuit also comprises the 3rd electric capacity, the 4th electric capacity, the 3rd diode and the 4th diode, wherein,
The first end of described the 3rd electric capacity is connected to earth point, the second end of described the second adjustable resistance that the second end of described the 3rd electric capacity is connected to, the first end of described the 4th electric capacity is connected to earth point, and the second end of described the 4th electric capacity is connected to the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device;
The anodic bonding of described the 3rd diode is to the second end of described the 3rd electric capacity, the negative electrode of described the 3rd diode is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the anodic bonding of described the 4th diode is to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, and the negative electrode of described the 4th diode is connected to the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device.
The application's second aspect provides a kind of light fixture with over-voltage protecting function; arbitrary possible output overvoltage protection circuit that implementation provides and the light source that comprise the application's first aspect or first aspect; wherein; the first end of described light source is connected to the output of the pressurizer of described output overvoltage protection circuit, and the second end of described light source is connected to earth point.
The present invention is by the sample output voltage of pressurizer of sampler, and output drive signal control switch device conducting when sampling output voltage over voltage limit value, thereby drag down the voltage of the voltage-regulation end of pressurizer, the output voltage of pressurizer is reduced, thereby avoid output overvoltage to cause load to damage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of a kind of output overvoltage protection circuit of providing of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the another kind of output overvoltage protection circuit that provides of the embodiment of the present invention;
Fig. 3 is the circuit diagram of another output overvoltage protection circuit of providing of the embodiment of the present invention;
Fig. 4 is the circuit diagram of another output overvoltage protection circuit of providing of the embodiment of the present invention;
Fig. 5 is the circuit diagram of another output overvoltage protection circuit of providing of the embodiment of the present invention;
Fig. 6 be the embodiment of the present invention provide another there is the light fixture of over-voltage protecting function.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 is the circuit diagram of a kind of output overvoltage protection circuit of providing of the embodiment of the present invention, and as shown in Figure 1, this output overvoltage protection circuit comprises:
Pressurizer 101, derailing switch 102 and sampler 103, wherein, pressurizer 101 comprises voltage-regulation end ADJUST, the absolute value of voltage V of the output of pressurizer 101 when the absolute value of voltage of voltage-regulation end ADJUST reduces
oUTreduce,
The earth terminal GND of pressurizer 101 is connected to earth point, and the input of pressurizer 101 is used for being connected to power supply, and the output OUT of pressurizer 101 is for being connected to the load of output overvoltage protection circuit;
The first end P1 of derailing switch 102 is connected to voltage-regulation end, and the second end P2 of derailing switch 102 is connected to earth point, and the drive end DR of derailing switch 102 is connected to the output OUT2 of sampler 103;
Sampler 103 is for the voltage of the output end of voltage stabilizer of sampling, and output drive signal control switch device 102 conductings when the absolute value of voltage that samples output end of voltage stabilizer surpasses voltage limit value, thereby reduces the absolute value of voltage of voltage-regulation end.
The present embodiment is by the sample voltage of output end of voltage stabilizer of sampler, and output drive signal control switch device conducting when the absolute value of voltage that samples output end of voltage stabilizer surpasses voltage limit value, thereby drag down the absolute value of voltage of the voltage-regulation end of pressurizer, the output voltage absolute value of pressurizer is reduced, thereby avoid output overvoltage to cause load to damage.
Please refer to Fig. 2, Fig. 2 is the circuit diagram of a kind of output overvoltage protection circuit of providing of the embodiment of the present invention, and as shown in Figure 2, this output overvoltage protection circuit comprises pressurizer 101, derailing switch 102 and sampler 103, wherein,
Pressurizer 101 comprises the adjustable output positive voltage of three ends voltage-stabilizing device U1, the first adjustable resistance R1 and the first resistance R 2, wherein, the adjustable side of R1 is connected to earth point, the first end of R1 is connected to the adjustable side of R1, the second end of R1 is connected to the first end of R2, the first end of R2 is the voltage-regulation end of pressurizer 101, the second end of R2 is connected to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1, the input pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1 is used for being connected to power supply, the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1 is the output of pressurizer 101.
Sampler 102 comprises the second resistance R 3 and the 3rd resistance R 4, the first end of R3 is connected to earth point, the second end of R3 is connected to the first end of R4, and the second end of R4 is connected to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1, and the first end of R4 is the output of sampler 102.
Derailing switch 103 comprises switching tube Q1, and the positive pole of switching tube Q1 is connected to the first end of R2, and the negative pole of switching tube Q1 is connected to earth point, and the driving pin of switching tube Q1 is connected to the first end of R4.
Alternatively, the adjustable output positive voltage of three ends voltage-stabilizing device U1 can be LM317, and switching tube Q1 can be NPN triode, the collector electrode of the just very triode of switching tube Q1, the negative pole of switching tube Q1 is the emitter of triode, the base stage that the driving pin of switching tube Q1 is triode.
Due to V
oUT=1.25 (1+R1/R2)+I
aDJ* R1, when adjustable resistance R1 loose contact, R1 is equivalent to open circuit, if do not add safeguard measure, V
oUTcan reach the output higher limit 37V close to LM317, this makes load bear the voltage more high than design load, easily burns load or circuit itself.
In the present embodiment, can choose voltage limit value, i.e. over-voltage protection point according to concrete load.The selection of R3, R4 resistance should make do not having under the normal operation of overvoltage at output pressure limited protection circuit; the base potential of Q1 is below 0.5V, and Q1 ends, and when output voltage surpasses voltage limit value; more than the base potential of Q1 can rise to 0.7V, thereby make Q1 open-minded.When occurring R1 loose contact, or other is while making output voltage surpass the situation of over-voltage protection point, and the base potential of Q1 rises to 0.7V when above, and Q1 conducting, drags down the voltage-regulation terminal voltage of LM317, makes output voltage V
oUTalso reduce, thereby load is played a protective role.
Alternatively, the output over-voltage protection voltage that the present embodiment provides can also comprise the first capacitor C 1, the second capacitor C 2, the first diode D1 and the second diode D2, as shown in Figure 3, and wherein,
The first end of the first capacitor C 1 is connected to earth point, the second end of the first resistance R 2 that the second end of C1 is connected to, and the first end of the second capacitor C 2 is connected to earth point, and the second end of C2 is connected to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1.
The anodic bonding of the first diode D1 is to the second end of C1, the negative electrode of D1 is connected to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1, the anodic bonding of the second diode D2 is to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device, and the negative electrode of D2 is connected to the input pin of the adjustable output positive voltage of three ends voltage-stabilizing device U1.
Wherein, C1 and C2 are filter capacitor, and D1 is for discharging to C1, and D2 is for discharging to C2.
In the present embodiment, when overvoltage appears in output loading, the dividing potential drop on R4 increases, and makes Q1 conducting, thereby the voltage-regulation terminal voltage of LM317 is dragged down, and makes output voltage+V
oUTreduce, thereby play the effect of protecting load.
Please refer to Fig. 4, Fig. 4 is the circuit diagram of the another kind of output overvoltage protection circuit that provides of the embodiment of the present invention, and as shown in Figure 4, this output overvoltage protection circuit comprises pressurizer 101, derailing switch 102 and sampler 103, wherein,
Pressurizer 101 comprises the adjustable output negative voltage of three ends voltage-stabilizing device U2, the second adjustable resistance R5 and the 4th resistance R 6, wherein, the adjustable side of R5 is connected to earth point, the first end of R5 is connected to the adjustable side of R5, the second end of R5 is connected to the first end of R6, the second end of R6 is connected to the voltage-regulation pin of the adjustable output negative voltage of three ends voltage-stabilizing device U2, the first end of R6 is the voltage-regulation end of pressurizer, the input pin of the adjustable output negative voltage of three ends voltage-stabilizing device U2 is used for being connected to power supply, the output pin of the adjustable output negative voltage of three ends voltage-stabilizing device U2 is the output of described pressurizer 101.
Sampler 102 comprises the 5th resistance R 7 and the 6th resistance R 8, the first end of R7 is connected to earth point, the second end of R7 is connected to the first end of R8, and the second end of R8 is connected to the output pin of the adjustable output negative voltage of three ends voltage-stabilizing device U2, and the second end of R7 is the output of sampler 102.
Derailing switch 103 comprises switching tube Q2, and the negative pole of Q2 is connected to the first end of R6, and the positive pole of Q2 is connected to earth point, and the driving pin of Q2 is connected to the second end of R7.
Wherein, the adjustable output negative voltage of three ends voltage-stabilizing device can be LM337, switching tube Q2 can be P-channel field-effect transistor (PEFT) crystal (P Metal Oxide Semiconductor, PMOS) pipe, wherein, the source electrode of the just very PMOS pipe of switching tube Q2, the negative pole of switching tube Q2 is the drain electrode of PMOS pipe, the driving pin of switching tube Q2 is the grid of PMOS pipe.
In the present embodiment, due to V
oUT=-(1.25 (1+R1/R2)+I
aDJ* R1),, when adjustable resistance R1 loose contact, R1 is equivalent to open circuit, if do not add safeguard measure, V
oUTcan reach the output higher limit-37V close to LM337, this makes load bear the voltage more high than design load, easily burns load or circuit itself.
In the present embodiment, due to the output voltage V of the adjustable output negative voltage of three ends voltage-stabilizing device
oUTwith the voltage-regulation end of pressurizer 101 be all negative value, the voltage-regulation terminal voltage described in the present embodiment declines and refers to that voltage-regulation end reduces to the pressure reduction of earth point, i.e. the absolute value of voltage decline, output voltage reduces to refer to that output voltage absolute value reduces.
Wherein, the resistance of R7, R8 is selected with reference to above-described embodiment, repeats no more here.
Alternatively, the output overvoltage protection circuit that the present embodiment provides can also comprise the 3rd capacitor C 3, the 4th capacitor C 4, the 3rd diode D3 and the 4th diode D4, as shown in Figure 5, and wherein,
The first end of C3 is connected to earth point, the second end of the R5 that the second end of C3 is connected to, and the first end of C4 is connected to earth point, and the second end of C4 is connected to the output pin of the adjustable output negative voltage of three ends voltage-stabilizing device U2.
The anodic bonding of the 3rd diode D3 is to the second end of C3, the negative electrode of D3 is connected to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U2, the anodic bonding of D4 is to the output pin of the adjustable output positive voltage of three ends voltage-stabilizing device U2, and the negative electrode of D4 is connected to the input pin of the adjustable output positive voltage of three ends voltage-stabilizing device U2.
Wherein, C3 and C4 are filter capacitor, and D3 is for discharging to C3, and D4 is for discharging to C4.
In the present embodiment, when overvoltage appears in output loading, the dividing potential drop on R7 increases, and makes Q2 conducting, thereby the voltage-regulation terminal voltage absolute value of LM337 is dragged down, and makes output voltage V
oUTabsolute value reduces, thereby plays the effect of protection load.
Please refer to Fig. 6; Fig. 6 is a kind of light fixture with over-voltage protecting function that the embodiment of the present invention provides; comprise output overvoltage protection circuit 201 and light source 202 as described in embodiment as arbitrary in Fig. 1 to Fig. 5; wherein; light source 202 is the load of output overvoltage protection circuit 201; the first end of light source 202 is connected to the output of output overvoltage protection circuit 201 pressurizers, and the second end of light source 202 is connected to earth point.
The light fixture that the present embodiment provides has over-voltage protecting function, and effectively protective circuit and light source are not burnt.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (10)
1. an output overvoltage protection circuit, is characterized in that, comprising: pressurizer, derailing switch and sampler; wherein; described pressurizer comprises voltage-regulation end, when the absolute value of voltage of described voltage-regulation end reduces described in the absolute value of voltage of output end of voltage stabilizer reduce
The earth terminal of described pressurizer is connected to earth point, and the input of described pressurizer is used for being connected to power supply, and the output of described pressurizer is for being connected to the load of described output overvoltage protection circuit;
The first end of described derailing switch is connected to described voltage-regulation end, and the second end of described derailing switch is connected to earth point, and the drive end of described derailing switch is connected to the output of described sampler;
Described sampler is for the voltage of the described output end of voltage stabilizer of sampling, and when the absolute value of voltage that samples described output end of voltage stabilizer surpasses voltage limit value, output drive signal is controlled described derailing switch conducting, thereby reduces the absolute value of voltage of described voltage-regulation end.
2. circuit according to claim 1, is characterized in that,
Described pressurizer comprises the adjustable output positive voltage of three ends voltage-stabilizing device, the first adjustable resistance and the first resistance, wherein, the adjustable side of described the first adjustable resistance is connected to earth point, the first end of described the first adjustable resistance is connected to the adjustable side of described the first adjustable resistance, the second end of described the first adjustable resistance is connected to the first end of described the first resistance, the first end of described the first resistance is the voltage-regulation end of described pressurizer, the second end of described the first resistance is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device is used for being connected to power supply, the output that the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device is described pressurizer.
3. circuit according to claim 2, is characterized in that,
Described sampler comprises the second resistance and the 3rd resistance, the first end of described the second resistance is connected to earth point, the second end of described the second resistance is connected to the first end of described the 3rd resistance, the second end of described the 3rd resistance is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the output that the first end of described the 3rd resistance is described sampler.
4. according to the circuit described in right 2 or 3, it is characterized in that,
Described derailing switch comprises switching tube, and the positive pole of described switching tube is connected to the first end of described the first resistance, and the negative pole of described switching tube is connected to earth point, and the driving pin of described switching tube is connected to the first end of described the 3rd resistance.
5. circuit according to claim 4, is characterized in that, described circuit also comprises the first electric capacity, the second electric capacity, the first diode and the second diode, wherein,
The first end of described the first electric capacity is connected to earth point, the second end of described the first resistance that the second end of described the first electric capacity is connected to, the first end of described the second electric capacity is connected to earth point, and the second end of described the second electric capacity is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device;
The anodic bonding of described the first diode is to the second end of described the first electric capacity, the negative electrode of described the first diode is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the anodic bonding of described the second diode is to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, and the negative electrode of described the second diode is connected to the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device.
6. according to circuit claimed in claim 1, it is characterized in that,
Described pressurizer comprises the adjustable output negative voltage of three ends voltage-stabilizing device, the second adjustable resistance and the 4th resistance, wherein, the adjustable side of described the second adjustable resistance is connected to earth point, the first end of described the second adjustable resistance is connected to the adjustable side of described the second adjustable resistance, the second end of described the second adjustable resistance is connected to the first end of described the 4th resistance, the second end of described the 4th resistance is connected to the voltage-regulation pin of the adjustable output negative voltage of described three end voltage-stabilizing device, the first end of described the 4th resistance is the voltage-regulation end of described pressurizer, the input pin of the adjustable output negative voltage of described three end voltage-stabilizing device is used for being connected to described power supply, the output that the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device is described pressurizer.
7. circuit according to claim 6, is characterized in that,
Described sampler comprises the 5th resistance and the 6th resistance, the first end of described the 5th resistance is connected to earth point, the second end of described the 5th resistance is connected to the first end of described the 6th resistance, the second end of described the 6th resistance is connected to the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device, the output that the second end of described the 5th resistance is described sampler.
8. according to the circuit described in claim 6 or 7, it is characterized in that,
Described derailing switch comprises switching tube, and the negative pole of described switching tube is connected to the first end of described the 4th resistance, and the positive pole of described switching tube is connected to earth point, and the driving pin of described switching tube is connected to the second end of described the 5th resistance.
9. circuit according to claim 8, is characterized in that, described circuit also comprises the 3rd electric capacity, the 4th electric capacity, the 3rd diode and the 4th diode, wherein,
The first end of described the 3rd electric capacity is connected to earth point, the second end of described the second adjustable resistance that the second end of described the 3rd electric capacity is connected to, the first end of described the 4th electric capacity is connected to earth point, and the second end of described the 4th electric capacity is connected to the output pin of the adjustable output negative voltage of described three end voltage-stabilizing device;
The anodic bonding of described the 3rd diode is to the second end of described the 3rd electric capacity, the negative electrode of described the 3rd diode is connected to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, the anodic bonding of described the 4th diode is to the output pin of the adjustable output positive voltage of described three end voltage-stabilizing device, and the negative electrode of described the 4th diode is connected to the input pin of the adjustable output positive voltage of described three end voltage-stabilizing device.
10. a light fixture with over-voltage protecting function; comprise output overvoltage protection circuit and light source as described in claim 1 to 9 any one; wherein, the first end of described light source is connected to the output of the pressurizer of described output overvoltage protection circuit, and the second end of described light source is connected to earth point.
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