CN205039517U - Overvoltage protection circuit - Google Patents

Overvoltage protection circuit Download PDF

Info

Publication number
CN205039517U
CN205039517U CN201520653203.0U CN201520653203U CN205039517U CN 205039517 U CN205039517 U CN 205039517U CN 201520653203 U CN201520653203 U CN 201520653203U CN 205039517 U CN205039517 U CN 205039517U
Authority
CN
China
Prior art keywords
control circuit
power supply
switch member
conducting
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201520653203.0U
Other languages
Chinese (zh)
Inventor
唐振辉
刘鸣冬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asiatek Inc
Original Assignee
Asiatek Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asiatek Inc filed Critical Asiatek Inc
Priority to CN201520653203.0U priority Critical patent/CN205039517U/en
Application granted granted Critical
Publication of CN205039517U publication Critical patent/CN205039517U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model provides an overvoltage protection circuit, be used for connecting a power supply and be used for the protection to use the electric installation, power supply is used for providing a power supply voltage, use the electric installation to be used for being a rated voltage at the voltage that normal during operation can bear, overvoltage protection circuit includes a first control circuit and 1 the 2nd control circuit, first control circuit connects the 2nd control circuit, the 2nd control circuit is used for connecting power supply and uses the electric installation, first control circuit is used for breaking off when power supply voltage is less than rated voltage, the 2nd control circuit is used for switching on when a control circuit breaks off, power supply is used for when the 2nd control circuit switches on electric connection to using the electric installation, first control circuit is used for switching on when power supply voltage is more than or equal to rated voltage, the 2nd control circuit is used for disconnection power supply and power consumption attachment of apparatus when a control circuit switches on.

Description

Overvoltage crowbar
Technical field
The utility model relates to a kind of protective circuit, particularly a kind of overvoltage crowbar.
Background technology
In circuit, outside power supply can provide a supply power voltage to power to power device, thus power device can normally be worked.But, when the supply power voltage that the power supply of described outside provides excessive and be greater than that described power device can bear maximum for voltage time, described excessive supply power voltage can damage described power device.
Summary of the invention
In view of above content, be necessary to provide a kind of protective circuit protecting power consumption equipment when the supply power voltage that power supply provides is excessive.
A kind of overvoltage crowbar, for connecting a power supply and for the protection of a power device, described power supply is used for providing a supply power voltage, the voltage that described power device is used for can bearing when normal work is a rated voltage, described overvoltage crowbar comprises a first control circuit and a second control circuit, described first control circuit connects described second control circuit, described second control circuit is for connecting described power supply and described power device, described first control circuit is used for disconnecting when described supply power voltage is less than described rated voltage, described second control circuit is used for the conducting when described first control circuit disconnects, described power supply is used for being electrically connected to described power device when described second control circuit conducting, described first control circuit is used for the conducting when described supply power voltage is more than or equal to described rated voltage, described second control circuit is used for the connection disconnecting described power supply and described power device when described first control circuit conducting.
Preferably, described second control circuit comprises one first switch member, described first switch member connects described first control circuit, described first switch member is for connecting described power supply and described power device, described first switch member to be used for when described first control circuit conducting cut-off and for the conducting when described first control circuit disconnects, and described power supply is used for being electrically connected to when described first switch member conducting described power device and for disconnecting the connection with described power device when described first switch member cut-off.
Preferably, described first switch member is a metal-oxide-semiconductor, and comprise a grid, one source pole and a drain electrode, the grid of described first switch member connects described first control circuit and for connecting described power supply, the grounded-grid of described first switch member, the drain electrode of described first switch member is for connecting described power device.
Preferably, described first control circuit comprises a second switch part, described second switch part is for connecting described power supply and connecting described first switch member, described second switch part is for the conducting when described supply power voltage is more than or equal to described rated voltage and for ending when described supply power voltage is less than described rated voltage, and described first switch member is for the cut-off when described second switch part conducting and for the conducting when described second switch part ends.
Preferably, the first end of described second switch part is for connecting described power supply, and the second end of described second switch part connects the grid of described first switch member, the source electrode of the first switch member described in the three-terminal link of described second switch part.
Preferably, described second switch part is a triode, the base stage of the corresponding described triode of first end of described second switch part, the collector electrode of the corresponding described triode of the second end of described second switch part, the emitter of the corresponding described triode of the 3rd end of described second switch part.
Preferably, described first control circuit also comprises a diode, and described diode is for connecting described power supply and connecting described second switch part.
Preferably, described first control circuit also comprises one first divider resistance and one second divider resistance, described first divider resistance is used for connection and between described power supply and described second divider resistance, described second divider resistance is used for being connected between described second switch part and described diode.
Preferably, the resistance value equal and opposite in direction of described first divider resistance and described second divider resistance.
Preferably, described first control circuit also comprises a diode, and described first switch member is a metal-oxide-semiconductor, and comprises a grid and one source pole, between the grid that described diode is connected to described first switch member and source electrode.
Compared with prior art; in above-mentioned overvoltage crowbar; the conducting when described supply power voltage is more than or equal to described rated voltage of described first control circuit; thus described second control circuit disconnects; to make described power supply disconnect the connection with described power device, thus protect described power device.
Accompanying drawing explanation
Fig. 1 is a functional block diagram of a better embodiment of the utility model overvoltage crowbar.
Fig. 2 is a circuit diagram of a better embodiment of the utility model overvoltage crowbar.
Main element symbol description
Overvoltage crowbar 10
Power device 20
Power supply 30
First control circuit 40
First node 41
Section Point 42
3rd node 43
Second control circuit 50
Filter capacitor C1~C3
Divider resistance R1~R4
Diode D1~D3
First switch member Q1
Second switch part Q2
Following embodiment will further illustrate the utility model in conjunction with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, a better embodiment of the present utility model, an overvoltage crowbar 10, for the protection of a power device 20.Described overvoltage crowbar 10 is for being connected between a power supply 30 and described power device 20.Described power supply 30 is for powering to described power device 20 by described overvoltage crowbar 10.
Described power device 20 has a rated voltage, and described rated voltage is described power device 20 maximum voltage that can bear when normal work.Described power supply 30 is for providing a supply power voltage.
Described overvoltage crowbar 10 comprises first control circuit 40 and a second control circuit 50.Described first control circuit 40 connects described power supply 30 and described second control circuit 50.Described second control circuit 50 connects described power device 20.
Described first control circuit 40 disconnects when being less than described rated voltage for the supply power voltage provided at described power supply 30.Described second control circuit 50 is for the conducting when described first control circuit 40 disconnects.Described power supply 30 is for being electrically connected to described power device 20 when described second control circuit 50 conducting, thus power supply is to described power device 20.
Conducting when described first control circuit 40 is equal to or less than described rated voltage for the supply power voltage provided at described power supply 30.Described second control circuit 50 is for disconnecting when described first control circuit 40 conducting.Described power supply 30 for disconnecting the connection with described power device 20 when described second control circuit 50 conducting, thus is not powered to described power device 20, to protect described power device 20.
Refer to Fig. 2, described first control circuit 40 comprises one first filter capacitor C1, one second filter capacitor C2, one first divider resistance R1, one second divider resistance R2, one first diode D1 and one first switch member Q1.
In one embodiment, described first diode D1 is a voltage stabilizing didoe, and described first switch member Q1 is a triode, and described first switch member Q1 comprises a base stage B, an emitter E and a collector electrode C.
Described second control circuit 50 comprises one the 3rd filter capacitor C3, one the 3rd divider resistance R3, one the 4th divider resistance R4, one second diode D2, one the 3rd diode D3 and a second switch part Q2.
In one embodiment, described second diode D2 is a voltage stabilizing didoe, and described 3rd diode D3 is an anti-reverse protection diode, and described second switch part Q2 is a P type metal-oxide-semiconductor, and described second switch part Q2 comprises a grid G, one source pole S and a drain D.
Described power supply 30 connects a first node 41.Described first node 41 connects the positive pole of described first filter capacitor C1, the minus earth of described first filter capacitor C1.Described first node 41 connects a Section Point 42 by described first divider resistance R1.Described Section Point 42 connects the negative pole of described first diode D1, the plus earth of described first diode D1.Described first node 41 connects described Section Point 42 by described second filter capacitor C2.Described Section Point 42 connects the base stage B of described first switch member Q1.The emitter E of described first switch member Q1 connects described first node 41.The collector electrode C of described first switch member Q1 connects one the 3rd node 43.Described 3rd divider resistance R3 is connected between described first node 41 with described 3rd node 43.Described second diode D2 is connected between described first node 41 with described 3rd node 43.Described 3rd filter capacitor C3 is also connected between described first node 41 with described 3rd node 43.Described 3rd node 43 is by described 4th divider resistance R4 ground connection.Described 3rd node 43 connects the grid G of described second switch part Q2.The source S of described second switch part Q2 connects described first node 41.The drain D of described second switch part Q2 connects the negative pole of described 3rd diode D3.The plus earth of described 3rd diode D3.The drain D of described second switch part Q2 connects described power device 20.
The operation principle of described overvoltage crowbar 10 is: when the supply power voltage that described power supply 30 provides is less than described rated voltage, described first switch member Q1 cut-off, thus described second switch part Q2 conducting, thus described power supply 30 is electrically connected to described power device 20 and powers to described power device 20; When the supply power voltage that described power supply 30 provides is more than or equal to described rated voltage; described first switch member Q1 conducting; thus described second switch part Q2 ends, thus described power supply 30 disconnects the connection with described power device 20, to protect described power device 20.
In one embodiment, described first divider resistance R1 is equal with the resistance value of described second divider resistance R2, the maximum rated voltage that can bear of described power device 20 is 12V, when the supply power voltage that described power supply 30 provides is less than described rated voltage 12V, the magnitude of voltage U1 of the base stage B of described first switch member Q1 is less than 6V(1/2*12V=6V), then described first switch member Q1 cut-off, thus described second switch part Q2 conducting, thus described power supply 30 is electrically connected to described power device 20 and powers to described power device 20; When the supply power voltage that described power supply 30 provides is more than or equal to 12V; the magnitude of voltage U1 of the base stage B of described first switch member Q1 is greater than 6V; then described first switch member Q1 conducting; thus described second switch part Q2 ends; thus described power supply 30 disconnects the connection with described power device 20, to protect described power device 20.
To one skilled in the art, can combine according to scheme of the invention of the present utility model and inventive concept the actual needs produced and make other change accordingly or adjustment, and these change and adjustment all should belong to scope disclosed in the utility model.

Claims (10)

1. an overvoltage crowbar, for connecting a power supply and for the protection of a power device, described power supply is used for providing a supply power voltage, the voltage that described power device is used for can bearing when normal work is a rated voltage, it is characterized in that: described overvoltage crowbar comprises a first control circuit and a second control circuit, described first control circuit connects described second control circuit, described second control circuit is for connecting described power supply and described power device, described first control circuit is used for disconnecting when described supply power voltage is less than described rated voltage, described second control circuit is used for the conducting when described first control circuit disconnects, described power supply is used for being electrically connected to described power device when described second control circuit conducting, described first control circuit is used for the conducting when described supply power voltage is more than or equal to described rated voltage, described second control circuit is used for the connection disconnecting described power supply and described power device when described first control circuit conducting.
2. overvoltage crowbar as claimed in claim 1, it is characterized in that: described second control circuit comprises one first switch member, described first switch member connects described first control circuit, described first switch member is for connecting described power supply and described power device, described first switch member is for the cut-off when described first control circuit conducting and for the conducting when described first control circuit disconnects, described power supply is used for being electrically connected to described power device and the connection for disconnection and described power device when described first switch member is ended when described first switch member conducting.
3. overvoltage crowbar as claimed in claim 2; it is characterized in that: described first switch member is a metal-oxide-semiconductor; and comprise a grid, one source pole and a drain electrode; the grid of described first switch member connects described first control circuit and for connecting described power supply; the grounded-grid of described first switch member, the drain electrode of described first switch member is for connecting described power device.
4. overvoltage crowbar as claimed in claim 3; it is characterized in that: described first control circuit comprises a second switch part; described second switch part is for connecting described power supply and connecting described first switch member; described second switch part is for the conducting when described supply power voltage is more than or equal to described rated voltage and for ending when described supply power voltage is less than described rated voltage, and described first switch member is for the cut-off when described second switch part conducting and for the conducting when described second switch part ends.
5. overvoltage crowbar as claimed in claim 4; it is characterized in that: the first end of described second switch part is for connecting described power supply; second end of described second switch part connects the grid of described first switch member, the source electrode of the first switch member described in the three-terminal link of described second switch part.
6. overvoltage crowbar as claimed in claim 5; it is characterized in that: described second switch part is a triode; the base stage of the corresponding described triode of first end of described second switch part; the collector electrode of the corresponding described triode of the second end of described second switch part, the emitter of the corresponding described triode of the 3rd end of described second switch part.
7. overvoltage crowbar as claimed in claim 4, it is characterized in that: described first control circuit also comprises a diode, described diode is for connecting described power supply and connecting described second switch part.
8. overvoltage crowbar as claimed in claim 7; it is characterized in that: described first control circuit also comprises one first divider resistance and one second divider resistance; described first divider resistance is used for connection and between described power supply and described second divider resistance, described second divider resistance is used for being connected between described second switch part and described diode.
9. overvoltage crowbar as claimed in claim 8, is characterized in that: the resistance value of described first divider resistance and described second divider resistance is equal.
10. overvoltage crowbar as claimed in claim 2; it is characterized in that: described first control circuit also comprises a diode; described first switch member is a metal-oxide-semiconductor, and comprises a grid and one source pole, between the grid that described diode is connected to described first switch member and source electrode.
CN201520653203.0U 2015-08-27 2015-08-27 Overvoltage protection circuit Active CN205039517U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520653203.0U CN205039517U (en) 2015-08-27 2015-08-27 Overvoltage protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520653203.0U CN205039517U (en) 2015-08-27 2015-08-27 Overvoltage protection circuit

Publications (1)

Publication Number Publication Date
CN205039517U true CN205039517U (en) 2016-02-17

Family

ID=55298388

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520653203.0U Active CN205039517U (en) 2015-08-27 2015-08-27 Overvoltage protection circuit

Country Status (1)

Country Link
CN (1) CN205039517U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018090924A1 (en) * 2016-11-18 2018-05-24 深圳创维数字技术有限公司 Over-voltage and reverse connection protection circuit and device thereof
WO2019134625A1 (en) * 2018-01-03 2019-07-11 中兴通讯股份有限公司 Fence circuit for mobile device and mobile device
CN112055923A (en) * 2018-05-15 2020-12-08 大陆-特韦斯贸易合伙股份公司及两合公司 Circuit arrangement for protecting electronic components

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018090924A1 (en) * 2016-11-18 2018-05-24 深圳创维数字技术有限公司 Over-voltage and reverse connection protection circuit and device thereof
WO2019134625A1 (en) * 2018-01-03 2019-07-11 中兴通讯股份有限公司 Fence circuit for mobile device and mobile device
CN112055923A (en) * 2018-05-15 2020-12-08 大陆-特韦斯贸易合伙股份公司及两合公司 Circuit arrangement for protecting electronic components

Similar Documents

Publication Publication Date Title
CN203166467U (en) Overvoltage protection circuit
CN101867168B (en) Power protecting circuit and LED lamp
CN205039517U (en) Overvoltage protection circuit
CN105633905A (en) Overvoltage and under-voltage protection circuit
CN204992541U (en) Switch power -supply overvoltage protecting circuit
CN204481472U (en) Overvoltage crowbar
CN205453117U (en) IGBT overvoltage crowbar
CN204376381U (en) For the overvoltage crowbar of LED high-voltage light bar
CN104218519A (en) Overvoltage protection circuit and lamp
CN103280865A (en) Charging port with over-voltage protection
CN103972859A (en) Overvoltage protecting circuit
CN208589916U (en) It is a kind of with overvoltage protection and it is anti-sparking function dc power interface circuit
CN203218857U (en) Overvoltage protection circuit
CN108288850B (en) Voltage conversion input/output low-end conduction protection circuit
CN202917939U (en) Short circuit protection circuit
CN204928109U (en) Protective circuit
CN207612045U (en) A kind of protection chip
CN204517360U (en) Excess voltage protection
CN209389690U (en) One kind being applied to intercom internal electric source overvoltage crowbar
CN204928080U (en) Overvoltage protection circuit
CN209929959U (en) Power supply protection circuit
CN208923810U (en) A kind of practical over-voltage and under-voltage protecting circuit
CN103490388A (en) Over-voltage and under-voltage protection circuit
CN203491695U (en) Reversal connection-resistant protective circuit for battery input of uninterrupted power source
CN203850814U (en) Load protection circuit of air purifier

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant