CN207039165U - Overvoltage crowbar - Google Patents
Overvoltage crowbar Download PDFInfo
- Publication number
- CN207039165U CN207039165U CN201720826731.0U CN201720826731U CN207039165U CN 207039165 U CN207039165 U CN 207039165U CN 201720826731 U CN201720826731 U CN 201720826731U CN 207039165 U CN207039165 U CN 207039165U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- semiconductor
- oxide
- metal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of overvoltage crowbar, including power input terminal, accesses input voltage；Mu balanced circuit, according to input voltage more than an overvoltage threshold whether, optionally by input voltage voltage stabilizing, and export a voltage regulation signal；Overpressure switch circuit, according to voltage regulation signal more than a conduction threshold whether, optionally turned on, and send a switching signal；Breaking circuit, whether threshold value is turned off more than one according to switching signal, selectively turns off back-end circuit.In overvoltage crowbar of the present utility model; when input voltage exceedes the over-pressed threshold values of protection; mu balanced circuit is by stabilized input voltage in constant value; overpressure switch circuit turn-on; breaking circuit turns off back-end circuit; and overpressure switch circuit is in cut-off in normal work, power consumption is not produced, so as to reduce caused power consumption in working condition.In addition, the metal-oxide-semiconductor in breaking circuit can quickly protect back-end circuit, reduce the electronic devices such as comparator, reduce power consumption and cost.
Description
Technical field
It the utility model is related to circuit design field, more particularly to a kind of overvoltage crowbar.
Background technology
In the prior art, the situation of overvoltage can all occur when in use in many electronic products, and rear end is higher by most in voltage
After height bears voltage, back-end circuit will be damaged.Many designs are all to use voltage comparator and reference source, and metal-oxide-semiconductor at present
To do voltage protection.
For example, as shown in figure 1, the reference voltage that device is compared using U2TL431 is inputted, when the in-phase end of comparator inputs
Comparator exports high level when voltage exceedes reference voltage, controls Q1A breaking circuits, exports low level during less than reference voltage,
Q1A is turned on, and circuit is resumed work.The shortcomings that this overvoltage crowbar is that comparator is working always, and this can not only increase work(
Consumption, and comparator will be high than three-level pipe volume and cost.
Utility model content
The technical problems to be solved in the utility model is, there is provided a kind of improved overvoltage crowbar.
Technical scheme is used by the utility model solves its technical problem：A kind of overvoltage crowbar is provided, including
Power input terminal, access input voltage；
Mu balanced circuit, be connected with the power input terminal, according to the input voltage more than an overvoltage threshold whether,
Optionally by the input voltage voltage stabilizing, and export a voltage regulation signal；
Overpressure switch circuit, be connected with the mu balanced circuit, according to the voltage regulation signal more than a conduction threshold whether,
Optionally turned on, and send a switching signal；
Breaking circuit, it is connected with the overpressure switch circuit, whether threshold value is turned off more than one according to the switching signal,
Selectively turn off back-end circuit.
Preferably, the mu balanced circuit includes the voltage-stabiliser tube and current-limiting resistance being serially connected, and described current-limiting resistance one end connects
The regulator tube negative is connect, the other end connects the power input terminal so as to access the input voltage；The voltage-stabiliser tube is just
Pole is grounded；
The overpressure switch circuit includes triode, and the transistor base connects the regulator tube negative so as to access
State voltage regulation signal, emitter stage connection power supply, grounded collector；
The breaking circuit includes metal-oxide-semiconductor, and the metal-oxide-semiconductor source electrode, grid connect the transistor emitter, current collection respectively
The switching signal is simultaneously accessed in pole, and the metal-oxide-semiconductor drain electrode connects the back-end circuit.
Preferably, the mu balanced circuit is also connected in parallel on the voltage-stabiliser tube and the coupling electricity at the current-limiting resistance both ends including one
Hold.
Preferably, the overpressure switch circuit also includes first resistor, and the transistor base connects the first resistor,
And the regulator tube negative is connected by the first resistor, the triode is PNP type triode.
Preferably, the breaking circuit also includes a biasing resistor, and described biasing resistor one end connects the metal-oxide-semiconductor source
Pole, the other end connect the metal-oxide-semiconductor grid.
Preferably, the breaking circuit also includes an AC compensation electric capacity, and the AC compensation electric capacity is connected in parallel on described inclined
Put resistance both ends.
Preferably, the breaking circuit also includes counnter attack filling switching tube, and the counnter attack is filled described in the connection of switching tube positive pole
Transistor collector, negative pole connect the metal-oxide-semiconductor grid.
Preferably, the breaking circuit also includes second resistance, and the metal-oxide-semiconductor grid is grounded by the second resistance.
Preferably, the metal-oxide-semiconductor includes two source electrodes, five drain electrodes, and the metal-oxide-semiconductor is PMOS.
Preferably, the breaking circuit be also connected including one with the metal-oxide-semiconductor, the fin for dissipating power consumption.
Implementing the beneficial effects of the utility model is：In overvoltage crowbar of the present utility model, when input voltage exceedes
The over-pressed threshold values of protection, mu balanced circuit is by stabilized input voltage in constant value, overpressure switch circuit turn-on, breaking circuit shut-off
Back-end circuit, and overpressure switch circuit is in cut-off in normal work, power consumption is not produced, so as to reduce in working condition
Caused power consumption.
In addition, the characteristic of voltage-stabiliser tube makes the metal-oxide-semiconductor in breaking circuit in triode, mu balanced circuit in overpressure switch circuit
Back-end circuit can be quickly protected, reduces the electronic devices such as comparator, reduces power consumption and cost.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is the circuit diagram of overvoltage crowbar in the prior art；
Fig. 2 is the principle schematic of overvoltage crowbar in the utility model some embodiments；
Fig. 3 is the circuit diagram of overvoltage crowbar in the utility model some embodiments.
Embodiment
In order to which the technical characteristics of the utility model, purpose and effect are more clearly understood, it is detailed now to compare accompanying drawing
Illustrate specific embodiment of the present utility model.
Overvoltage crowbar in some embodiments of the utility model as shown in Figure 2, for being carried out to back-end circuit 50
Overvoltage protection, i.e., when input voltage exceedes the over-pressed threshold values of protection, back-end circuit 50 will be protected.Some implementations of the utility model
Overvoltage crowbar in example includes power input terminal 10, mu balanced circuit 20, overpressure switch circuit 30 and breaking circuit 40, electricity
Source input terminal 10 is used to access input voltage, and mu balanced circuit 20 is used for input voltage voltage stabilizing and exports voltage regulation signal, overvoltage
On-off circuit 30 is used to be selectively turned on according to voltage regulation signal and send switching signal, and breaking circuit 40 is used to be believed according to switch
Number selectively turn off back-end circuit 50.
Wherein, power input terminal 10 is used to access input voltage.With reference to shown in Fig. 3, power input terminal 10 is terminal
J4, there are three joints, joint 1 accesses input voltage, and joint 2,3 is grounded.It is to be appreciated that the form of power input terminal 10 is not
It is limited to this, in certain embodiments, power input terminal 10 can also be common other forms, as long as related work(can be realized
Energy.
Mu balanced circuit 20 is connected with power input terminal 10, for according to input voltage more than an overvoltage threshold whether,
Optionally by input voltage voltage stabilizing, and export a voltage regulation signal.Preferably, mu balanced circuit 20 includes the voltage-stabiliser tube being serially connected
D6 and current-limiting resistance R64, current-limiting resistance R64 one end connect voltage-stabiliser tube D6 negative poles, the other end connection power input terminal 10 so as to
Access input voltage；Voltage-stabiliser tube D6 plus earths.Specifically, when input voltage exceedes the over-pressed threshold values of protection, voltage-stabiliser tube D6 two
The voltage at end will be stabilized in constant value；If input voltage is not above over-pressed threshold values, voltage regulation signal is not exported, follow-up
Circuit does not start.Alternatively, mu balanced circuit 20 also includes a coupling for being connected in parallel on voltage-stabiliser tube D6 and current-limiting resistance R64 both ends
Electric capacity C31, the i.e. termination powers of coupled capacitor C31 mono-, one end ground connection.Overvoltage threshold herein is not specifically limited, can basis
Real needs in actual circuit are set.
Overpressure switch circuit 30 is connected with mu balanced circuit 20, according to voltage regulation signal more than a conduction threshold whether, selection
Turned on to property, and send a switching signal.Preferably, overpressure switch circuit 30 includes triode Q2, triode Q2 base stages
For connection voltage-stabiliser tube D6 negative poles so as to access voltage regulation signal, emitter stage connects power supply, grounded collector.Specifically, voltage regulation signal is worked as
During more than conduction threshold, triode Q2 conductings, switching signal is sent, subsequent conditioning circuit works on；Led when voltage regulation signal is no more than
During logical threshold value, triode Q2 cut-offs, power consumption is not produced, subsequent conditioning circuit does not work.In the present embodiment, triode Q2 is positive-negative-positive three
Pole pipe.It is to be appreciated that in some embodiments, it is also possible to substituted with other kinds of pipe, such as NPN type triode
Deng as long as correlation function can be realized.Electric conduction of the conduction threshold herein between triode Q2 emitter stages and base stage
Pressure.Alternatively, overpressure switch circuit 30 may also include first resistor R65, triode Q2 base stages connection first resistor R65, and
Pass through first resistor R65 connection voltage-stabiliser tube D6 negative poles.
Breaking circuit 40 is connected with overpressure switch circuit 30, whether turns off threshold value more than one according to switching signal, selection
Turn off back-end circuit 50 to property.Preferably, breaking circuit 40 includes metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 source electrodes, grid connect three poles respectively
Pipe Q2 emitter stages, colelctor electrode simultaneously access switching signal, metal-oxide-semiconductor Q1 drain electrode connection back-end circuits 50.Specifically, when switching signal is small
When threshold value is turned off, i.e., metal-oxide-semiconductor Q1 grid voltages are less than the threshold voltage of metal-oxide-semiconductor Q1 conducting, back-end circuit with source voltage
50 are turned off, and play a protective role.It should be noted that metal-oxide-semiconductor Q1 herein is PMOS, it is possible to understand that ground, or
Other kinds of pipe, such as CMOS tube, as long as correlation function can be realized.Metal-oxide-semiconductor Q1 in the present embodiment is to include
Two source electrodes, the high current metal-oxide-semiconductor Q1 of five drain electrodes, i.e., including source S 1 and S2, drain D 1, D2, D3, D4 and D5, so as to
To dissipate big power consumption.Or a fin can also be set again in breaking circuit 40, the fin is connected with metal-oxide-semiconductor Q1
Connect, for dissipating power consumption, so as to play a part of protecting metal-oxide-semiconductor Q1.Shut-off threshold value herein is not specifically limited, can basis
Real needs in actual circuit are set.
Alternatively, the breaking circuit 40 in the present embodiment may also include biasing resistor R66, AC compensation electric capacity C32, prevent
It is anti-to fill switching tube D7 and second resistance R69.Wherein, biasing resistor R66 one end connection metal-oxide-semiconductor Q1 source electrodes, other end connection metal-oxide-semiconductor
Q1 grids.AC compensation electric capacity C32 is connected in parallel on biasing resistor R66 both ends.Counnter attack, which fills switching tube D7, which to be played, prevents voltage is counter from filling
Effect, its positive pole connecting triode Q2 colelctor electrode, negative pole connection metal-oxide-semiconductor Q1 grids.Second resistance R69 is grounded, metal-oxide-semiconductor Q1 grids
It is grounded by second resistance R69.
Described above is only preferred embodiment of the present utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under the utility model thinking belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, several improvement under the premise of the utility model principle is not departed from
And retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (10)
- A kind of 1. overvoltage crowbar, it is characterised in that includingPower input terminal (10), access input voltage；Mu balanced circuit (20), it is connected with the power input terminal (10), according to the input voltage more than an overvoltage threshold Whether, optionally by the input voltage voltage stabilizing, and export a voltage regulation signal；Overpressure switch circuit (30), it is connected with the mu balanced circuit (20), according to the voltage regulation signal more than a conduction threshold Whether, optionally turned on, and send a switching signal；Breaking circuit (40), it is connected with the overpressure switch circuit (30), according to the switching signal more than a shut-off threshold value Whether, selectively turn off back-end circuit (50).
- 2. overvoltage crowbar according to claim 1, it is characterised in thatThe mu balanced circuit (20) includes the voltage-stabiliser tube (D6) and current-limiting resistance (R64) being serially connected, the current-limiting resistance (R64) One end connects voltage-stabiliser tube (D6) negative pole, and the other end connects the power input terminal (10) so as to access the input electricity Pressure；Voltage-stabiliser tube (D6) plus earth；The overpressure switch circuit (30) includes triode (Q2), and it is negative that triode (Q2) base stage connects the voltage-stabiliser tube (D6) So as to access the voltage regulation signal, emitter stage connects power supply, grounded collector for pole；The breaking circuit (40) includes metal-oxide-semiconductor (Q1), and metal-oxide-semiconductor (Q1) source electrode, grid connect the triode respectively (Q2) emitter stage, colelctor electrode and the switching signal is accessed, metal-oxide-semiconductor (Q1) drain electrode connects the back-end circuit (50).
- 3. overvoltage crowbar according to claim 2, it is characterised in that it is in parallel that the mu balanced circuit (20) also includes one Coupled capacitor (C31) at the voltage-stabiliser tube (D6) and the current-limiting resistance (R64) both ends.
- 4. overvoltage crowbar according to claim 2, it is characterised in that the overpressure switch circuit (30) also includes the One resistance (R65), triode (Q2) base stage connect the first resistor (R65), and by the first resistor (R65) even The voltage-stabiliser tube (D6) negative pole is connect, the triode (Q2) is PNP type triode (Q2).
- 5. overvoltage crowbar according to claim 2, it is characterised in that the breaking circuit (40) also includes a biasing Resistance (R66), described biasing resistor (R66) one end connect metal-oxide-semiconductor (Q1) source electrode, and the other end connects the metal-oxide-semiconductor (Q1) Grid.
- 6. overvoltage crowbar according to claim 5, it is characterised in that the breaking circuit (40) also includes an exchange Compensating electric capacity (C32), the AC compensation electric capacity (C32) are connected in parallel on the biasing resistor (R66) both ends.
- 7. overvoltage crowbar according to claim 6, it is characterised in that the breaking circuit (40) also includes a counnter attack Switching tube (D7) is filled, the counnter attack fills switching tube (D7) positive pole and connects triode (Q2) colelctor electrode, and negative pole connects the MOS Manage (Q1) grid.
- 8. overvoltage crowbar according to claim 7, it is characterised in that the breaking circuit (40) also includes the second electricity Hinder (R69), metal-oxide-semiconductor (Q1) grid is grounded by the second resistance (R69).
- 9. according to the overvoltage crowbar described in claim any one of 2-8, it is characterised in that the metal-oxide-semiconductor (Q1) includes two Individual source electrode, five drain electrodes, the metal-oxide-semiconductor (Q1) is PMOS.
- 10. according to the overvoltage crowbar described in claim any one of 2-8, it is characterised in that the breaking circuit (40) is also It is connected including one with the metal-oxide-semiconductor (Q1), the fin for dissipating power consumption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720826731.0U CN207039165U (en) | 2017-07-07 | 2017-07-07 | Overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720826731.0U CN207039165U (en) | 2017-07-07 | 2017-07-07 | Overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039165U true CN207039165U (en) | 2018-02-23 |
Family
ID=61467259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720826731.0U Expired - Fee Related CN207039165U (en) | 2017-07-07 | 2017-07-07 | Overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207039165U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803360A (en) * | 2020-12-31 | 2021-05-14 | 广州极飞科技股份有限公司 | Surge protection circuit, surge protection method and battery power supply circuit |
-
2017
- 2017-07-07 CN CN201720826731.0U patent/CN207039165U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803360A (en) * | 2020-12-31 | 2021-05-14 | 广州极飞科技股份有限公司 | Surge protection circuit, surge protection method and battery power supply circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110224456A (en) | A kind of satellite low-power consumption starting power supply system | |
| CN103545803A (en) | Protective device of equipment power source interface circuit | |
| CN203415975U (en) | Two-way surge protection circuit | |
| CN108039695B (en) | Overvoltage crowbar | |
| CN206249131U (en) | Power protecting circuit and supply unit | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN105048422A (en) | Switch transistor voltage drop holding circuit and application of switch transistor voltage drop holding circuit in lithium battery protection circuit | |
| CN213367403U (en) | Power input end surge current control circuit | |
| CN207039165U (en) | Overvoltage crowbar | |
| CN204835697U (en) | Preferred power supply switching circuit of voltage | |
| CN206595713U (en) | A kind of surge protection circuit | |
| CN104298331A (en) | Power supply circuit for power supply control chip | |
| CN207625441U (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN204205932U (en) | Anti-high voltage surge soft starting circuit | |
| CN205070409U (en) | Switch transistor pressure drop holding circuit and applied this pressure drop holding circuit's lithium battery protection circuit | |
| CN204131110U (en) | Based on the battery system anti-surge circuit of discrete elements | |
| CN207588431U (en) | Overvoltage, reversal connection and power-down protection circuit | |
| CN209929946U (en) | Power supply protection circuit of Ethernet switch | |
| CN103683215A (en) | Short-circuit protection circuit of electronic switch | |
| CN207320883U (en) | Rechargeable battery manages circuit | |
| CN209313724U (en) | A kind of voltage conversion circuit and driving device | |
| CN209402181U (en) | A kind of battery over-discharge protection circuit, communication equipment and battery | |
| CN207321110U (en) | One kind powers on buffer circuit | |
| CN106685192A (en) | Power supply circuit of switch system | |
| CN206775383U (en) | A kind of power circuit with fictitious load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 Termination date: 20210707 |