CN209001563U - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
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- CN209001563U CN209001563U CN201822105285.1U CN201822105285U CN209001563U CN 209001563 U CN209001563 U CN 209001563U CN 201822105285 U CN201822105285 U CN 201822105285U CN 209001563 U CN209001563 U CN 209001563U
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Abstract
A kind of overvoltage crowbar; including input, output end, voltage-stabiliser tube, the first triode, the second triode, PMOS tube and periphery resistance; the voltage-stabiliser tube is connected between input terminal and ground after connecting with a first resistor, and the cathode of voltage-stabiliser tube is connect with input terminal；The base stage of first triode is connected on the node between voltage-stabiliser tube and first resistor, and the collector of the first triode is connected to input terminal, the emitter ground connection of the first triode by a second resistance；The base stage of second triode is connect with the collector of the first triode, and the emitter ground connection of the second triode, the collector of the second triode and the control electrode of PMOS tube connect；The source electrode of PMOS tube is connect with input terminal, and the drain electrode of PMOS tube is connect with output end, and a 3rd resistor is connected between the source electrode of PMOS tube and control electrode.Due to constituting protection circuit by the common component such as resistance, voltage-stabiliser tube, switching tube, so that the circuit of the application has advantage at low cost.
Description
Technical field
This application involves a kind of overvoltage crowbars.
Background technique
Existing overvoltage protection is all using overvoltage protection chip, and cost is fine, and inflexible for use, cannot be neatly
Adjust required protection voltage.
Summary of the invention
The application provides a kind of overvoltage crowbar at low cost.
According in a first aspect, provide a kind of overvoltage crowbar in a kind of embodiment, including input terminal and output end, also wrap
Voltage-stabiliser tube, the first triode, the second triode, PMOS tube and periphery resistance are included, the voltage-stabiliser tube is connected with a first resistor
After be connected between input terminal and ground, the cathode of voltage-stabiliser tube is connect with input terminal；The base stage of first triode is connected to voltage-stabiliser tube
On node between first resistor, the collector of the first triode is connected to input terminal, the one or three pole by a second resistance
The emitter of pipe is grounded；The base stage of second triode is connect with the collector of the first triode, and the emitter of the second triode connects
Ground, the collector of the second triode and the control electrode of PMOS tube connect；The source electrode of PMOS tube is connect with input terminal, the leakage of PMOS tube
Pole is connect with output end, and a 3rd resistor is connected between the source electrode of PMOS tube and control electrode.
It preferably, further include the 4th resistance, the 4th resistance is connected to the collector and PMOS tube of the second triode
Between control electrode；Or the 4th resistance be connected between the emitter and ground of the second triode.
It preferably, further include the 5th resistance, the 5th resistance is connected to the base stage and the first triode of the second triode
Collector between.
It preferably, further include the 6th resistance and the 7th resistance, the 6th resistance is connected to the base stage and transmitting of the first triode
Between pole；7th resistance is connected between the base stage and emitter of the second triode.
It preferably, further include the 8th resistance, the 8th resistance is connected to the base of the anode and the first triode of voltage-stabiliser tube
Between pole.
It preferably, further include capacitor, the capacitance connection is between output end and ground.
According to the overvoltage crowbar of above-described embodiment, due to being by the common component such as resistance, voltage-stabiliser tube, switching tube
Protection circuit is constituted, so that the circuit of the application has advantage at low cost.Compared with overvoltage protection chip, the application can lead to
The adjusting for crossing resistance is flexibly applied to the overvoltage protection of different voltage values.
Detailed description of the invention
Fig. 1 is the circuit diagram of one embodiment overvoltage crowbar of the application；
Fig. 2 is the circuit diagram of another embodiment overvoltage crowbar of the application.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
Embodiment one:
Referring to FIG. 1, overvoltage crowbar, including input terminal VCC_IN and output end VCC_OUT, it further include voltage-stabiliser tube
D1, the first triode Q1, the second triode Q2, PMOS tube and periphery resistance, voltage-stabiliser tube D1 connect after connecting with first resistor R1
It is connected between input terminal VCC_IN and ground, wherein the cathode of voltage-stabiliser tube D1 is connect with input terminal VCC_IN；First triode Q1's
Base stage is connected on the node 1 between voltage-stabiliser tube D1 and first resistor R1 by the 8th resistance R8, and the 8th resistance R8's acts on
The voltage of input terminal VCC_IN input is divided after voltage-stabiliser tube D1 is breakdown, the voltage for avoiding input terminal VCC_IN from inputting
Acting directly on the first triode Q1 causes the first triode Q1 to burn out, and protects to the first triode Q1.
The collector of first triode Q1 is connected to input terminal VCC_IN by a second resistance R2, the first triode Q1's
Emitter ground connection, the effect of second resistance R2 are protection the first triode Q1 and the second triode Q2；The base of second triode Q2
Pole is connect by the 5th resistance R5 with the collector of the first triode Q1, the emitter ground connection of the second triode Q2, the two or three pole
The collector of pipe Q2 is connect by the 4th resistance R4 with the control electrode of PMOS tube M1；The source electrode and input terminal VCC_IN of PMOS tube M1
Connection, the drain electrode of PMOS tube M1 are connect with output end VCC_OUT, and 3rd resistor R3 is connected to the source electrode and control electrode of PMOS tube M1
Between.It is also connected with the 6th resistance R6 between the base stage and emitter of the first triode Q1, in the base stage of the second triode Q2
The 7th resistance R7 is also connected between emitter.Since there are parasitic capacitances between the base stage and emitter of triode, when three
After pole pipe power-off, the electric energy that can rapidly eliminate the storage of this parasitic capacitance of the 6th resistance R6 and the 7th resistance R7.
As preferred embodiment of the present application, a capacitor C is also connected between output end VCC_OUT and ground, in circuit
PMOS tube closure is filtered when exchanging with conducting.
The working principle of the application is illustrated below.
When input terminal VCC_IN voltage is higher than threshold value, voltage-stabiliser tube D1 reverse-conducting, so that the first triode Q1 of driving is led
It is logical, the driving of the second triode Q2 is dragged down after the first triode Q1 conducting, the second triode Q2 cut-off, so that the control of PMOS tube
Pole tension processed is identical as source voltage, PMOS tube cut-off, thus close input terminal to output end current path.
When voltage drop is down to below threshold value, voltage-stabiliser tube D1 reversely by, the first triode Q1 driving is insufficient and closes, the
Two triode Q2 are driven by second resistance R2 from input terminal VCC_IN, the second triode Q2 conducting, so that 3rd resistor
The both ends R3 generate pressure drop, so that PMOS tube is connected, the current path of input terminal VCC_IN to output end VCC_OUT is opened.
Embodiment two:
Referring to FIG. 2, the present embodiment is basically the same as the first embodiment, it the difference is that only that the 4th resistance R4 is connected to
Between the emitter and ground of two triode Q2, and circuit something in common repeats no more.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (6)
1. a kind of overvoltage crowbar, including input terminal and output end, it is characterised in that further include voltage-stabiliser tube, the first triode,
Second triode, PMOS tube and periphery resistance, the voltage-stabiliser tube are connected to input terminal and ground after connecting with a first resistor
Between, the cathode of voltage-stabiliser tube is connect with input terminal；The base stage of first triode is connected to the node between voltage-stabiliser tube and first resistor
On, the collector of the first triode is connected to input terminal, the emitter ground connection of the first triode by a second resistance；Two or three
The base stage of pole pipe is connect with the collector of the first triode, the emitter ground connection of the second triode, the collector of the second triode
It is connect with the control electrode of PMOS tube；The source electrode of PMOS tube is connect with input terminal, and the drain electrode of PMOS tube is connect with output end, a third
Resistance is connected between the source electrode of PMOS tube and control electrode.
2. overvoltage crowbar as described in claim 1, which is characterized in that further include the 4th resistance, the 4th resistance connects
It is connected between the collector of the second triode and the control electrode of PMOS tube；Or the 4th resistance be connected to the transmitting of the second triode
Between pole and ground.
3. overvoltage crowbar as described in claim 1, which is characterized in that further include the 5th resistance, the 5th resistance connects
It is connected between the base stage of the second triode and the collector of the first triode.
4. overvoltage crowbar as described in claim 1, which is characterized in that it further include the 6th resistance and the 7th resistance, the 6th
Resistance is connected between the base stage and emitter of the first triode；7th resistance is connected to the base stage and emitter of the second triode
Between.
5. overvoltage crowbar as described in claim 1, which is characterized in that further include the 8th resistance, the 8th resistance connects
It is connected between the anode of voltage-stabiliser tube and the base stage of the first triode.
6. overvoltage crowbar as described in claim 1, which is characterized in that further include capacitor, the capacitance connection is in output
Between end and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105285.1U CN209001563U (en) | 2018-12-15 | 2018-12-15 | A kind of overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105285.1U CN209001563U (en) | 2018-12-15 | 2018-12-15 | A kind of overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209001563U true CN209001563U (en) | 2019-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822105285.1U Active CN209001563U (en) | 2018-12-15 | 2018-12-15 | A kind of overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209001563U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110867824A (en) * | 2019-12-18 | 2020-03-06 | 大唐半导体科技有限公司 | Power supply circuit for anti-explosion oil filling tax control machine |
-
2018
- 2018-12-15 CN CN201822105285.1U patent/CN209001563U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110867824A (en) * | 2019-12-18 | 2020-03-06 | 大唐半导体科技有限公司 | Power supply circuit for anti-explosion oil filling tax control machine |
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