CN207612045U - A kind of protection chip - Google Patents
A kind of protection chip Download PDFInfo
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- CN207612045U CN207612045U CN201721036879.0U CN201721036879U CN207612045U CN 207612045 U CN207612045 U CN 207612045U CN 201721036879 U CN201721036879 U CN 201721036879U CN 207612045 U CN207612045 U CN 207612045U
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- 230000005669 field effect Effects 0.000 claims abstract description 24
- 230000002633 protecting effect Effects 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
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Abstract
The utility model has carried a kind of protection chip, and the protection chip includes：Two variable resistances, diode, triode, field-effect tube.The bleeder circuit control protection electric circuit that the protection chip of the utility model is made up of two adjustable resistances crosses pressure point; the voltage detecting to supply voltage and input circuit is completed using diode and triode; the connection of input circuit and output circuit is controlled by field-effect tube; it is realized by the first capacitance and accelerates the protection connecting and disconnecting of the circuit time, the signal that filters out the part in circuit and need not respond is realized by the second capacitance.
Description
Technical field
The utility model is related to circuit protection field more particularly to a kind of protection chips.
Background technology
Overvoltage protection Over Voltage Protection abbreviation OVP, overvoltage protection refers to that protected circuit voltage is more than
When scheduled maximum value, power supply is made to disconnect or make a kind of protected mode of controlled device voltage reduction.If voltage is excessively high suddenly,
The dielectric strength and pressure voltage of electrical equipment are just had exceeded, therefore electrical equipment can generate heat, puncture and burn out even on fire.
Some current OVP circuits had that pressure point is unadjustable, and the reaction time cannot be adjusted, defeated after design typification
Enter pressure resistance and input current the case where can not adjusting, cause it is long in the R＆D cycle for researching and developing and designing new circuit structure,
R＆D costs are higher.And some current OVP due to response speed it is excessively slow, the turn-off time is long, fast in the transient states surging such as surge
It is difficult to play protecting effect in the case of speed variation, often leads to late-class circuit and also have certain damage.
Invention content
For the above problem existing for circuit protection in the prior art, a kind of protection chip is now provided.
Specific technical solution is as follows：
A kind of protection chip includes：
Triode, the triode are NPN type triode, and the emitter of the triode connects the defeated of the protection chip
Enter end, the collector of the triode connects first node, and the first node connects the external power supply of the protection chip, institute
State transistor base connection second node；
The anode of first diode, first diode connects the second node, the cathode of first diode
Connect third node；
First resistor, described first resistor one end connect the third node, and the other end connects the external power supply；
Second resistance, described second resistance one end connect the third node, and the other end connects input terminal；
Field-effect tube, the field-effect tube are N-channel field-effect tube, and the grid of the field-effect tube connects first node,
The source electrode of the field-effect tube connects the input terminal, and the FET drain connects the output end of the protection chip.
Preferably, the protection chip includes the first capacitance, and first capacitance one end connects the third node, described
The first capacitance other end connects the external power supply.
Preferably, the protection chip includes the second capacitance, and second capacitance one end connects the second node, described
The second capacitance other end connects the input terminal.
Preferably, the first resistor and the second resistance are adjustable resistance.
Preferably, the protection chip includes the second diode, and the cathode of second diode connects the external electricity
The anode in source, second diode connects the input terminal.
Preferably, second diode is Zener diode or Transient Suppression Diode.
Preferably, the protection chip further includes 3rd resistor and the 4th resistance；
The 3rd resistor is arranged on the connecting line between the external power supply and the first node；4th electricity
One end of resistance connects the first node, and the other end connects the input terminal.
Preferably, the 3rd resistor and the 4th resistance are adjustable resistance.
Preferably, first diode is Transient Suppression Diode.
The advantageous effect of the technical solution adopted in the utility model：
Divided using first resistor and second resistance, completed to supply voltage using the first diode and triode and
The voltage detecting of input terminal, by field-effect tube come the connection status of control signal and output end, to protect output end
Circuit, the power circuit where field-effect tube are detached with the driving circuit that other circuits form, and applicability is stronger, is imitated using field
Should pipe the conduction impedance of circuit can be made lower, be lost smaller, it is more efficient.
Description of the drawings
Fig. 1 is a kind of electrical block diagram of the embodiment of protection chip of the utility model.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
In the utility model preferred embodiment, as shown in Figure 1, a kind of protection chip includes：
Triode Q2, triode Q2 are NPN type triode, and the emitter of triode Q2 connects input terminal, triode Q2's
Collector connects first node 1, and first node 1 connects external power supply Vcc, and transistor base connects second node 2；
The anode connection second node 2 of first diode D1, the first diode D1, the cathode connection the of the first diode D1
Three nodes 3；
The one end first resistor R1, first resistor R1 connects third node 3, and the other end connects external power supply Vcc；
The one end second resistance R2, second resistance R2 connects third node 3, and the other end connects input terminal；
Field-effect tube Q1, field-effect tube Q1 are N-channel field-effect tube, and the grid of field-effect tube Q1 connects first node 1, field
The source electrode of effect pipe Q1 connects input terminal, field-effect tube Q1 drain electrode connection output ends.
Specifically, in the present embodiment：Using the bleeder circuit of first resistor R1 and second resistance R2 compositions to external power supply
The voltage of Vcc and input terminal is divided, and is completed to the electricity of first resistor R1 and second using the first diode D1 and triode Q2
Voltage after resistance R2 partial pressures is detected, by field-effect tube Q1 according to the result of detection come control signal and output end
Connection.When the grid voltage of field-effect tube Q1 is pulled low, field-effect tube is closed, cut-out input terminal and output end it
Between connection, to protect the circuit and overvoltage protection chip of output end.
In a kind of preferred embodiment of the utility model, protection chip includes the first capacitance C1, and first one end capacitance C1 connects
Third node 3 is connect, the first capacitance C1 other ends connect external power supply Vcc.
Specifically, in the present embodiment, the charge and discharge by the first capacitance C1 to triode Q2 base stages are realized and reduce triode
The turn-on time of Q2, to accelerate the shutdown of the circuit under overpressure situation.
In a kind of preferred embodiment of the utility model, protection chip includes the second capacitance C2, and second one end capacitance C2 connects
Second node 2 is connect, the second capacitance C2 other ends connect input terminal.
Specifically, the signal that the part in circuit need not respond can be effectively filtered out using the second capacitance C2
Have, improves the stability of protection chip.
In a kind of preferred embodiment of the utility model, first resistor R1 and second resistance R2 are adjustable resistance.
It specifically, can be according to the power of the electrical equipment in circuit to partial pressure electricity using adjustable resistance in the present embodiment
Road is adjusted, and using the bleeder circuit for changing first resistor R1 and second resistance R2 compositions, realization is adjusted into the one or two pole
The voltage of the detection detection circuit of pipe D1 and triode Q2 compositions, and then it is adjusted into the height of field-effect tube Q1 grid voltages,
To achieve the effect that the over-pressed trigger point of adjustment protection chip.The over-pressed trigger point of circuit：Vtrig=(Vref+VF)×(R1+R2)
÷R2；VFRefer to conduction voltage drops of the P to N under relative temperature between triode Q2 base stages and emitter, turn-on condition IR<
5uA；VrefRefer to conduction voltage drops of the first diode D1 under relative temperature, turn-on condition IR<5uA；
In a kind of preferred embodiment of the utility model, protection chip includes the second diode D2, and the second diode is born
Pole connects external power supply Vcc, the anode connection input terminal of the second diode.Specifically, the second diode D2 can be to input terminal
The surge of input, electrostatic, the voltge surges such as impulse train carry out first-order release type protection, protect protection chip and and output end.
In a kind of preferred embodiment of the utility model, the second diode D2 is that Zener diode or transient state inhibit two poles
Pipe.Specifically, using Zener diode or Transient Suppression Diode can to protect chip have the reaction speed that is exceedingly fast and
Lower clamping voltag.
In a kind of preferred embodiment of the utility model, protection chip further includes 3rd resistor R3 and the 4th resistance R4；The
Three resistance R3 are arranged on the connecting line between external power Vcc and first node 1；One end of 4th resistance R4 connects first segment
Point 1, the other end connect input terminal；3rd resistor R3 and the 4th resistance R4 is adjustable resistance.
Specifically, in the present embodiment, 3rd resistor R3 and the 4th resistance R4 are according between field-effect tube Q1 grids and source electrode
Between voltage pressure resistance situation the voltage of input terminal is divided, prevent protection chip device both end voltage be more than pressure voltage
Destroy circuit structure.3rd resistor R3 and the 4th resistance R4 resistance values are adjustable, can be according to actual circuit in circuit
Applicable cases adjustment setting.
In a kind of preferred embodiment of the utility model, the first diode D1 is Transient Suppression Diode.Specifically, it uses
Transient Suppression Diode can so that chip is protected to have rollback curve ability have lower clamping voltag and lower conducting
The characteristic of impedance.
It these are only the utility model preferred embodiment, be not intended to limit the embodiment and protection of the utility model
Range should can appreciate that all with the utility model specification and diagramatic content institute to those skilled in the art
The equivalent replacement made and obviously change obtained scheme, the scope of protection of the utility model should all be included in
It is interior.
Claims (9)
1. a kind of protection chip, which is characterized in that including：
Triode, the triode are NPN type triode, and the emitter of the triode connects the input of the protection chip
The collector at end, the triode connects first node, and the first node connects the external power supply of the protection chip, described
Transistor base connects second node；
The anode of first diode, first diode connects the second node, the cathode connection of first diode
Third node；
First resistor, described first resistor one end connect the third node, and the other end connects the external power supply；
Second resistance, described second resistance one end connect the third node, and the other end connects input terminal；
Field-effect tube, the field-effect tube are N-channel field-effect tube, and the grid of the field-effect tube connects first node, described
The source electrode of field-effect tube connects the input terminal, and the FET drain connects the output end of the protection chip.
2. protecting chip according to claim 1, which is characterized in that including the first capacitance, the connection of first capacitance one end
The third node, the first capacitance other end connect the external power supply.
3. protecting chip according to claim 1, which is characterized in that including the second capacitance, the connection of second capacitance one end
The second node, the second capacitance other end connect the input terminal.
4. protecting chip according to claim 1, which is characterized in that the first resistor and the second resistance are adjustable electric
Resistance.
5. protecting chip according to claim 1, which is characterized in that including the second diode, second diode is born
Pole connects the external power supply, and the anode of second diode connects the input terminal.
6. protecting chip according to claim 5, which is characterized in that second diode is that Zener diode or transient state press down
Diode processed.
7. protecting chip according to claim 1, which is characterized in that further include 3rd resistor and the 4th resistance；
The 3rd resistor is arranged on the connecting line between the external power supply and the first node；
One end of 4th resistance connects the first node, and the other end connects the input terminal.
8. protecting chip according to claim 7, which is characterized in that the 3rd resistor and the 4th resistance are adjustable electric
Resistance.
9. protecting chip according to claim 1, which is characterized in that first diode is Transient Suppression Diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721036879.0U CN207612045U (en) | 2017-08-18 | 2017-08-18 | A kind of protection chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721036879.0U CN207612045U (en) | 2017-08-18 | 2017-08-18 | A kind of protection chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207612045U true CN207612045U (en) | 2018-07-13 |
Family
ID=62792204
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721036879.0U Active CN207612045U (en) | 2017-08-18 | 2017-08-18 | A kind of protection chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207612045U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239445A (en) * | 2018-10-26 | 2019-01-18 | 延锋伟世通电子科技（南京）有限公司 | A kind of power on and off detection circuit of automobile power system |
| CN110289592A (en) * | 2019-07-23 | 2019-09-27 | 陕西瑞迅电子信息技术有限公司 | A kind of power import protection circuit of double NMOS buildings |
| CN110401360A (en) * | 2019-08-14 | 2019-11-01 | 成都克伏特航空设备有限公司 | A kind of output system of passive signal |
| CN116799920A (en) * | 2023-07-03 | 2023-09-22 | 湖南炬神电子有限公司 | Direct current charging protection circuit |
-
2017
- 2017-08-18 CN CN201721036879.0U patent/CN207612045U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239445A (en) * | 2018-10-26 | 2019-01-18 | 延锋伟世通电子科技（南京）有限公司 | A kind of power on and off detection circuit of automobile power system |
| CN109239445B (en) * | 2018-10-26 | 2024-05-17 | 延锋伟世通电子科技（南京）有限公司 | Power-on and power-off detection circuit of automobile power supply system |
| CN110289592A (en) * | 2019-07-23 | 2019-09-27 | 陕西瑞迅电子信息技术有限公司 | A kind of power import protection circuit of double NMOS buildings |
| CN110401360A (en) * | 2019-08-14 | 2019-11-01 | 成都克伏特航空设备有限公司 | A kind of output system of passive signal |
| CN116799920A (en) * | 2023-07-03 | 2023-09-22 | 湖南炬神电子有限公司 | Direct current charging protection circuit |
| CN116799920B (en) * | 2023-07-03 | 2024-01-02 | 湖南炬神电子有限公司 | Direct current charging protection circuit |
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Address after: Zuchongzhi road in Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 2277 Building No. 7 Patentee after: Shanghai Xindao Electronic Technology Co., Ltd Address before: Zuchongzhi road in Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 2277 Building No. 7 Patentee before: SHANGHAI PRISEMI ELECTRONIC TECHNOLOGY Co.,Ltd. |