CN204156500U - Overcurrent-overvoltage protecting circuit - Google Patents

Overcurrent-overvoltage protecting circuit Download PDF

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Publication number
CN204156500U
CN204156500U CN201420583727.2U CN201420583727U CN204156500U CN 204156500 U CN204156500 U CN 204156500U CN 201420583727 U CN201420583727 U CN 201420583727U CN 204156500 U CN204156500 U CN 204156500U
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CN
China
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connected
circuit
resistance
described
end
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CN201420583727.2U
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Chinese (zh)
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熊文
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深圳市英威腾电气股份有限公司
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Priority to CN201420583727.2U priority Critical patent/CN204156500U/en
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Publication of CN204156500U publication Critical patent/CN204156500U/en

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Abstract

The utility model discloses a kind of overcurrent-overvoltage protecting circuit, for being connected between DC power supply and load, described overcurrent-overvoltage protecting circuit comprises a switching tube, one sample circuit and a control circuit, described switching tube and sample circuit are connected between the input of overcurrent-overvoltage protecting circuit and output successively, described input is used for being connected with DC power supply, described output is used for being connected with load, with the input of overcurrent-overvoltage protecting circuit while of described control circuit, sample circuit and switching tube are connected, for coming the conducting of control switch pipe or shutoff according to the input voltage of input, and come the conducting of control switch pipe or shutoff by the electric current that sample circuit detects.The connection that the utility model overcurrent-overvoltage protecting circuit controls between DC power supply and load by arranging a switching tube; when DC power supply output HIGH voltage or big current; switching tube will be in half conducting or off state; thus load can be avoided to bear high voltage and big current, protect load well.

Description

Overcurrent-overvoltage protecting circuit

Technical field

The utility model relates to circuit engineering field, relates more specifically to a kind of overcurrent-overvoltage protecting circuit.

Background technology

DC power supply is a kind of supply unit providing direct voltage output, is generally used for as load such as all kinds of power electronic equipment.Start moment in DC power supply or be in operation and easily occur excessive voltage, and easily produce excessive electric current due to the reason such as load short circuits or overload, thus cause circuit to there is potential safety hazard and easily electronic equipment caused damage.For the problems referred to above, an overcurrent-overvoltage protecting circuit usually can be set up in a power to improve the security performance of circuit.

Existing DC power supply overcurrent-overvoltage protecting circuit normally increases by an inspection leakage resistance at the output of circuit, when output current is excessive, voltage through inspection leakage resistance raises, the Voltage Feedback at inspection leakage resistance two ends is to power control terminal (controller of power source internal), control end detects abnormal signal and turns off control, and output is turned off; After output is turned off, the signal that control end detects then recovers normal, and control end will work on by control circuit, and once circuit is resumed work, then abnormal signal can be detected again, again makes to export to turn off, so repeatedly.Although the program can avoid the electronic equipment of output to work long hours in overcurrent-overvoltage state; but when circuit cannot be made to occur overcurrent-overvoltage situation, power input and output are disconnected completely; therefore output is made still to need repeatedly to bear big current and the high voltage of short time; cause the electronic equipment being connected to output easily damaged; therefore, existing overcurrent-overvoltage protecting circuit can not really play a protective role.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of overcurrent-overvoltage protecting circuit avoiding load to bear high voltage and big current.

In order to solve the problems of the technologies described above, the utility model provides a kind of overcurrent-overvoltage protecting circuit, for being connected between DC power supply and load, described overcurrent-overvoltage protecting circuit comprises a switching tube, one sample circuit and a control circuit, described switching tube and sample circuit are connected between the input of overcurrent-overvoltage protecting circuit and output successively, described input is used for being connected with DC power supply, described output is used for being connected with load, with the input of overcurrent-overvoltage protecting circuit while of described control circuit, sample circuit and switching tube are connected, for coming the conducting of control switch pipe or shutoff according to the input voltage of input, and come the conducting of control switch pipe or shutoff by the electric current that sample circuit detects.

Its further technical scheme is: described control circuit comprises the first regulating circuit, the second regulating circuit, the first comparison circuit and the second comparison circuit, wherein, described first regulating circuit is used for the mistake flow point of match circuit, its input is connected to sample circuit, its output is connected to the first comparison circuit, and the output of described first comparison circuit is connected to the second regulating circuit; Described second regulating circuit is used for the pressure point excessively of match circuit; its input is connected to the input of overcurrent-overvoltage protecting circuit; its output is connected to the second comparison circuit, and the output of described second comparison circuit is connected to the control end of switching tube with the conducting of control switch pipe or shutoff.

Its further technical scheme is: described sample circuit comprises the 5th resistance, and the 5th resistance one end is connected with the output of switching tube, and the other end is connected with the output of overcurrent-overvoltage protecting circuit.

Its further technical scheme is: described first regulating circuit comprises the first resistance, the second resistance, the 3rd resistance and the 4th resistance; Described first resistance one end is connected with the output of overcurrent-overvoltage protecting circuit, and the other end is connected with one end of the 4th resistance, the other end ground connection of described 4th resistance; Described second resistance one end is connected with the output of switching tube, and the other end is connected with one end of the 3rd resistance, the other end ground connection of described 3rd resistance; Described first comparison circuit comprises the first operational amplifier, the in-phase input end of this first operational amplifier is connected between the second resistance and the 3rd resistance, its reverse input end is connected between the first resistance and the 4th resistance, and its output is connected to described second regulating circuit.

Its further technical scheme is: described second regulating circuit comprises voltage-stabiliser tube, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the negative pole of described voltage-stabiliser tube is connected with the input of overcurrent-overvoltage protecting circuit, its positive pole is connected with one end of the 8th resistance, the other end of described 8th resistance is connected with one end of the 6th resistance, and the other end of described 6th resistance is connected with the output of the first operational amplifier; Described 7th resistance one end is connected with the input of overcurrent-overvoltage protecting circuit, and the other end is connected with one end of the 9th resistance, the other end ground connection of described 9th resistance; Described second comparison circuit comprises the second operational amplifier, the in-phase input end of this second operational amplifier is connected between the 6th resistance and the 8th resistance, its reverse input end is connected between the 7th resistance and the 9th resistance, and its output is connected to the control end of switching tube.

Its further technical scheme is: described overcurrent-overvoltage protecting circuit also comprises the tenth resistance, between the output that the tenth resistance is connected to described second comparison circuit and the control end of switching tube.

Its further technical scheme is: described switching tube is P type metal-oxide-semiconductor, and the drain electrode of this P type metal-oxide-semiconductor is as the input of switching tube, and its source electrode is as the output of switching tube, and its grid is as the control end of switching tube.

Compared with prior art, the utility model overcurrent-overvoltage protecting circuit controls between DC power supply and load by arranging a switching tube connection; When the input of protective circuit has high voltage to input, control circuit control switch pipe disconnects, make to disconnect completely between the input of protective circuit and output, the input of this high voltage can not be transferred to the output of protective circuit, thus avoids load to bear high voltage; When the input of protective circuit has big current to input; control circuit can detect this big current according to sample circuit; and then control switch pipe disconnects; due to the disconnection of switching tube; sample circuit testing result changes, and makes the conducting of control circuit control switch pipe, through repeatedly to disconnect fast and after conducting, switching tube finally enters the operating state of half conducting; make the electric current of the output flowing to protective circuit very greatly, thus load can not be protected.

By following description also by reference to the accompanying drawings, the utility model will become more clear, and these accompanying drawings are for explaining embodiment of the present utility model.

Accompanying drawing explanation

Fig. 1 is the frame principle figure of the utility model overcurrent-overvoltage protecting circuit;

Fig. 2 is the frame principle figure of the utility model overcurrent-overvoltage protecting circuit one specific embodiment;

Fig. 3 is the circuit diagram of overcurrent-overvoltage protecting circuit shown in Fig. 2.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in embodiment, reference numerals similar in accompanying drawing represents similar assembly.Obviously, be only the utility model part embodiment below by the embodiment of description, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Overcurrent-overvoltage protecting circuit of the present utility model is used for being connected between DC power supply and load; when DC power supply output HIGH voltage or big current; this protective circuit will disconnect the connection between DC power supply and load; thus load can be avoided to bear high voltage and big current, protect load well.

With reference to Fig. 1, the utility model overcurrent-overvoltage protecting circuit 10 comprises switching tube 11, sample circuit 12 and control circuit 13, described switching tube 11 and sample circuit 12 are connected between the input 14 of protective circuit and output 15 successively, wherein, input 14 is for being connected with DC power supply, output 15 is for being connected with load, with the input 14 of protective circuit while of described control circuit 13, sample circuit 12 and switching tube 11 are connected, for carrying out the turn-on and turn-off of control switch pipe 11 according to the input voltage of protective circuit, and the turn-on and turn-off of control switch pipe 11 are carried out by the electric current that sample circuit 12 detects.

With reference to Fig. 2, in some embodiment, such as, in the present embodiment, control circuit 13 comprises the first regulating circuit 131, second regulating circuit 132, first comparison circuit 133 and the second comparison circuit 134.Wherein, the input of described first regulating circuit 131 is connected to described sample circuit 12, and its output is connected to the first comparison circuit 133, and the output of described first comparison circuit 133 is connected to the second regulating circuit 132; The input of described second regulating circuit 132 is connected to the input 14 of protective circuit, and its output is connected to the second comparison circuit 134, and the output of described second comparison circuit 134 is connected to the control end of switching tube 11 with control switch pipe 11 conducting or shutoff.Based on foregoing circuit design, when high voltage appears in the input 14 of protective circuit, the second regulating circuit 132, by the input signal of change second comparison circuit 134, make the second comparison circuit 134 change output signal, thus control switch pipe 11 turns off; When there is big current in the input 14 of protective circuit; the current feedback detected by sample circuit 12 is to the first regulating circuit 131; the output of the first comparison circuit 133 is controlled by the first regulating circuit 131; and the output of the first comparison circuit 133 will affect the output of the second regulating circuit 132 further, thus the second comparison circuit 134 controllable switch pipe 11 is turned off.

With reference to Fig. 3; in some embodiment; such as, in the present embodiment; described switching tube 11 is P type metal-oxide-semiconductor, and the drain D of this P type metal-oxide-semiconductor is as the input of switching tube 11, and it is connected with the input 14 (IN) of protective circuit; the source S of metal-oxide-semiconductor Q1 is as the output of switching tube 11; it is connected with the input of sample circuit 12, and the grid G of metal-oxide-semiconductor Q1 is as the control end of switching tube 11, and it is connected with the output of control circuit 13.

In some embodiment; such as, in the present embodiment, sample circuit 12 comprises the 5th resistance R5, and the 5th resistance R5 is as inspection leakage resistance; its one end is connected with the output (source S of metal-oxide-semiconductor Q1) of switching tube 11, and the other end is connected with the output 15 (OUT) of protective circuit.

In some embodiment, such as, in the present embodiment, the first regulating circuit 131 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.Particularly, described first resistance R1 one end is connected with the output OUT of protective circuit, and the other end is connected with one end of the 4th resistance R4, the other end ground connection of described 4th resistance R4; Described second resistance R2 one end is connected with the output (source S of metal-oxide-semiconductor Q1) of switching tube 11, and the other end is connected with one end of the 3rd resistance R3, the other end ground connection of described 3rd resistance R3.First comparison circuit 133 comprises the first operational amplifier U1, the in-phase input end of this first operational amplifier U1 is connected between the second resistance R2 and the 3rd resistance R3, its reverse input end is connected between the first resistance R1 and the 4th resistance R4, and its output is connected to described second regulating circuit 132.

In some embodiment, such as, in the present embodiment, described second regulating circuit 132 comprises voltage-stabiliser tube Z1, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9, the negative pole of described voltage-stabiliser tube Z1 is connected with the input 14 of protective circuit, its positive pole is connected with one end of the 8th resistance R8, the other end of described 8th resistance R8 is connected with one end of the 6th resistance R6, and the other end of described 6th resistance R6 is connected with the output of the first operational amplifier U1; Described 7th resistance R7 one end is connected with the input 14 of protective circuit, and the other end is connected with one end of the 9th resistance R9, the other end ground connection of described 9th resistance R9.Described second comparison circuit 134 comprises the second operational amplifier U2, the in-phase input end of this second operational amplifier U2 is connected between the 6th resistance R6 and the 8th resistance R8, its reverse input end is connected between the 7th resistance R7 and the 9th resistance R9, and its output is connected to the control end (grid G of metal-oxide-semiconductor Q1) of switching tube 11.

In the control circuit 13 of the present embodiment, the first regulating circuit 131 and the second regulating circuit 132 utilize the dividing potential drop of resistance to be used for the mistake flow point of match circuit; Meanwhile, the second regulating circuit 132 utilize the reverse breakdown of voltage-stabiliser tube Z1 and the dividing potential drop of resistance be used for match circuit cross pressure point.

In some embodiment, such as, in the present embodiment, overcurrent-overvoltage protecting circuit 10 also comprises the tenth resistance R10, and the tenth resistance R10 is connected between the output of the second operational amplifier U2 and the grid G of metal-oxide-semiconductor Q1 to provide metering function.

Continue with reference to Fig. 3, the following detailed description of the operation principle of the present embodiment overcurrent-overvoltage protecting circuit 10.

Normal input: when the input IN of protective circuit 10 has normal signal to input, signal flows through MOS pipe Q1, flow through inspection leakage resistance R5 again until the output OUT of protective circuit 10, be in this when normally exporting, because the voltage difference examining leakage resistance R5 two ends can not be very large, now, the voltage of the reverse input end (1 pin) of the first operational amplifier U1 is higher than the voltage of its in-phase input end (2 pin), then output (3 pin) output low level of the first operational amplifier U1, at this moment the in-phase input end (2 pin) of the second operational amplifier U2 is also correspondingly low level, because the reverse input end (1 pin) of the second operational amplifier U2 is also low level, then output (3 pin) output low level of the second operational amplifier U2, thus to order about metal-oxide-semiconductor Q1 be conducting state.

Overcurrent inputs: when the input IN of protective circuit 10 has big current to input, the voltage difference flowing through inspection leakage resistance R5 two ends can raise accordingly, cause the voltage of voltage higher than its reverse input end (1 pin) of the in-phase input end (2 pin) of the first operational amplifier U1, then the output (3 pin) of the first operational amplifier U1 exports high level, correspondingly, the in-phase input end (2 pin) of the second operational amplifier U2 exports high level, cause the output (3 pin) of the second operational amplifier U2 to export as high level, then metal-oxide-semiconductor Q1 transfers off state to; After metal-oxide-semiconductor Q1 is turned off, inspection leakage resistance R5 two ends can be made not produce voltage difference, the voltage of the reverse input end (1 pin) of the first operational amplifier U1 higher than the voltage of its in-phase input end (2 pin), thus makes metal-oxide-semiconductor Q1 transfer conducting state to; After the switching carrying out the turn-on and turn-off state in extremely short time, metal-oxide-semiconductor Q1 will finally be in the state (a kind of states between turn-on and turn-off) of half conducting, and protective circuit 10 is stabilized in this small area analysis operating state.

Overvoltage inputs: when the input IN of protective circuit 10 have high voltage to input and the reverse voltage of this high voltage higher than voltage-stabiliser tube Z1 time; voltage-stabiliser tube Z1 is reversed and punctures; then the conducting of voltage-stabiliser tube Z1 makes the in-phase input end of the second operational amplifier U2 (2 pin) be high level; cause the output (3 pin) of the second operational amplifier U2 to export as high level, then metal-oxide-semiconductor Q1 is off state.

As mentioned above, the utility model overcurrent-overvoltage protecting circuit controls between DC power supply and load by arranging a switching tube connection; When the input of protective circuit has high voltage to input, control circuit control switch pipe disconnects, make to disconnect completely between the input of protective circuit and output, the input of this high voltage can not be transferred to the output of protective circuit, thus avoids load to bear high voltage; When the input of protective circuit has big current to input; control circuit can detect this big current according to sample circuit; and then control switch pipe disconnects; due to the disconnection of switching tube; sample circuit testing result changes, and makes the conducting of control circuit control switch pipe, through repeatedly to disconnect fast and after conducting, switching tube finally enters the operating state of half conducting; make the electric current of the output flowing to protective circuit very greatly, thus load can not be protected.

More than in conjunction with preferred embodiment, the utility model is described, but the utility model is not limited to the embodiment of above announcement, and the various amendment carried out according to essence of the present utility model should be contained.

Claims (7)

1. an overcurrent-overvoltage protecting circuit; for being connected between DC power supply and load; it is characterized in that: described overcurrent-overvoltage protecting circuit comprises a switching tube, a sample circuit and a control circuit; described switching tube and sample circuit are connected between the input of overcurrent-overvoltage protecting circuit and output successively; described input is used for being connected with DC power supply; described output is used for being connected with load
Be connected with the input of overcurrent-overvoltage protecting circuit, sample circuit and switching tube while of described control circuit; for coming the conducting of control switch pipe or shutoff according to the input voltage of input, and come the conducting of control switch pipe or shutoff by the electric current that sample circuit detects.
2. overcurrent-overvoltage protecting circuit according to claim 1, is characterized in that: described control circuit comprises the first regulating circuit, the second regulating circuit, the first comparison circuit and the second comparison circuit, wherein,
Described first regulating circuit is used for the mistake flow point of match circuit, and its input is connected to sample circuit, and its output is connected to the first comparison circuit, and the output of described first comparison circuit is connected to the second regulating circuit;
Described second regulating circuit is used for the pressure point excessively of match circuit; its input is connected to the input of overcurrent-overvoltage protecting circuit; its output is connected to the second comparison circuit, and the output of described second comparison circuit is connected to the control end of switching tube with the conducting of control switch pipe or shutoff.
3. overcurrent-overvoltage protecting circuit according to claim 2, is characterized in that: described sample circuit comprises the 5th resistance, and the 5th resistance one end is connected with the output of switching tube, and the other end is connected with the output of overcurrent-overvoltage protecting circuit.
4. the overcurrent-overvoltage protecting circuit according to Claims 2 or 3, is characterized in that:
Described first regulating circuit comprises the first resistance, the second resistance, the 3rd resistance and the 4th resistance; Described first resistance one end is connected with the output of overcurrent-overvoltage protecting circuit, and the other end is connected with one end of the 4th resistance, the other end ground connection of described 4th resistance; Described second resistance one end is connected with the output of switching tube, and the other end is connected with one end of the 3rd resistance, the other end ground connection of described 3rd resistance;
Described first comparison circuit comprises the first operational amplifier, the in-phase input end of this first operational amplifier is connected between the second resistance and the 3rd resistance, its reverse input end is connected between the first resistance and the 4th resistance, and its output is connected to described second regulating circuit.
5. overcurrent-overvoltage protecting circuit according to claim 4, it is characterized in that: described second regulating circuit comprises voltage-stabiliser tube, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance, the negative pole of described voltage-stabiliser tube is connected with the input of overcurrent-overvoltage protecting circuit, its positive pole is connected with one end of the 8th resistance, the other end of described 8th resistance is connected with one end of the 6th resistance, and the other end of described 6th resistance is connected with the output of the first operational amplifier; Described 7th resistance one end is connected with the input of overcurrent-overvoltage protecting circuit, and the other end is connected with one end of the 9th resistance, the other end ground connection of described 9th resistance;
Described second comparison circuit comprises the second operational amplifier, the in-phase input end of this second operational amplifier is connected between the 6th resistance and the 8th resistance, its reverse input end is connected between the 7th resistance and the 9th resistance, and its output is connected to the control end of switching tube.
6. the overcurrent-overvoltage protecting circuit according to Claims 2 or 3, is characterized in that: also comprise the tenth resistance, between the output that the tenth resistance is connected to described second comparison circuit and the control end of switching tube.
7. the overcurrent-overvoltage protecting circuit according to claim 1,2 or 3; it is characterized in that: described switching tube is P type metal-oxide-semiconductor; the drain electrode of this P type metal-oxide-semiconductor is as the input of switching tube, and its source electrode is as the output of switching tube, and its grid is as the control end of switching tube.
CN201420583727.2U 2014-10-10 2014-10-10 Overcurrent-overvoltage protecting circuit CN204156500U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420583727.2U CN204156500U (en) 2014-10-10 2014-10-10 Overcurrent-overvoltage protecting circuit

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Application Number Priority Date Filing Date Title
CN201420583727.2U CN204156500U (en) 2014-10-10 2014-10-10 Overcurrent-overvoltage protecting circuit

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104882856A (en) * 2015-05-25 2015-09-02 重庆大学 High-precision over-current detection circuit
CN106711935A (en) * 2017-02-15 2017-05-24 杰华特微电子(杭州)有限公司 Overvoltage protection circuit and load voltage regulation circuit
CN106951051A (en) * 2017-05-10 2017-07-14 郑州云海信息技术有限公司 A kind of running protection method of server backplane
CN107546724A (en) * 2017-07-17 2018-01-05 北方电子研究院安徽有限公司 A kind of input overcurrent protective device
CN107918429A (en) * 2017-11-29 2018-04-17 郑州云海信息技术有限公司 A kind of checking of great current feedback control circuit and control method
CN108879591A (en) * 2018-07-18 2018-11-23 深圳市沃特沃德股份有限公司 High current power supply protection circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104882856A (en) * 2015-05-25 2015-09-02 重庆大学 High-precision over-current detection circuit
CN106711935A (en) * 2017-02-15 2017-05-24 杰华特微电子(杭州)有限公司 Overvoltage protection circuit and load voltage regulation circuit
CN106951051A (en) * 2017-05-10 2017-07-14 郑州云海信息技术有限公司 A kind of running protection method of server backplane
WO2018205473A1 (en) * 2017-05-10 2018-11-15 郑州云海信息技术有限公司 Operation protection method for server back board
CN107546724A (en) * 2017-07-17 2018-01-05 北方电子研究院安徽有限公司 A kind of input overcurrent protective device
CN107918429A (en) * 2017-11-29 2018-04-17 郑州云海信息技术有限公司 A kind of checking of great current feedback control circuit and control method
CN107918429B (en) * 2017-11-29 2019-10-29 郑州云海信息技术有限公司 A kind of checking of great current feedback control circuit and control method
CN108879591A (en) * 2018-07-18 2018-11-23 深圳市沃特沃德股份有限公司 High current power supply protection circuit

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GR01 Patent grant
C14 Grant of patent or utility model
TR01 Transfer of patent right

Effective date of registration: 20160106

Address after: 215000 No. 1, Kunlun mountain road, hi tech Zone, Jiangsu, Suzhou

Patentee after: INVT POWRE ELECTRONICS (SUZHOU) CO., LTD.

Address before: 518000 Nanshan District, Shenzhen Province, Longjing high tech Industrial Park, No. 4 plant on the ground floor, No.

Patentee before: Shenzhen Yingweiteng Electric Co., Ltd.

C41 Transfer of patent application or patent right or utility model