CN208423764U - A kind of overvoltage crowbar based on triode - Google Patents
A kind of overvoltage crowbar based on triode Download PDFInfo
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- CN208423764U CN208423764U CN201820331471.4U CN201820331471U CN208423764U CN 208423764 U CN208423764 U CN 208423764U CN 201820331471 U CN201820331471 U CN 201820331471U CN 208423764 U CN208423764 U CN 208423764U
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Abstract
The utility model relates to a kind of overvoltage crowbars based on triode, comprising: MicroUSB interface J1, zener diode D1, divider resistance R30, divider resistance R31, triode Q7, pull-up resistor R29, filter circuit and metal-oxide-semiconductor Q8；The 1st pin (VIN foot) in the MicroUSB interface J1 is connect with one end of capacitor C1 and resistance R1 in the cathode of zener diode D1, one end of pull-up resistor R29 and filter circuit respectively, the anode of the zener diode D1 is connect with one end of the divider resistance R30, and the other end of the divider resistance R30 connects two branches.The voltage protection circuit that the utility model does not need chip class can be achieved with the overvoltage protection of circuit, meet the demand of growing cost control and overvoltage protection, and the circuit components of the utility model are few, principle is simple and easy to control, simple and reliable.
Description
Technical field
The utility model relates to power protection field more particularly to a kind of overvoltage crowbars based on triode.
Background technique
Under the background that consumer electronics increasingly continues to develop, market requires more the cost and performance of entire product
Come it is higher, in order to avoid the reasons such as unstable because of artificial misconnection high-voltage power supply or operating voltage caused by overtension
And the circuit system that may cause malfunctions or burns power supply, it usually needs various overvoltage protections are arranged.Over-voltage guarantor is carried out at present
Dedicated overvoltage protection IC, but dedicated overvoltage protection IC higher cost can be used in shield, and device is not easy to purchase.And existing over-voltage
Protection scheme mostly uses greatly postposition protected mode, can only set single protection voltage value in this manner, not be able to satisfy each
Use demand in the case of kind.
Utility model content
In view of the deficiencies in the prior art or insufficient, the utility model provides a kind of over-voltage guarantor based on triode
Protection circuit.
To achieve the goals above, the technical solution that the utility model is taken is to provide a kind of over-voltage guarantor based on triode
Protection circuit, comprising: MicroUSB interface J1, zener diode D1, divider resistance R30, divider resistance R31, triode Q7, pull-up
Resistance R29, filter circuit and metal-oxide-semiconductor Q8；The 1st pin in the MicroUSB interface J1 respectively with zener diode D1
Cathode, one end of pull-up resistor R29 and the capacitor C1 in filter circuit and resistance R1 one end be connected to voltage input
End；The anode of the zener diode D1 is connect with one end of the divider resistance R30, the other end of the divider resistance R30
Two branches are connected, one branch is connect with one end of the divider resistance R31, the other end ground connection of the resistance R31, another
Branch is connect with the base stage of the triode Q7, and the other end of the collector of the triode Q7 and the pull-up resistor R29 connect
It connects, the emitter ground connection of the triode Q7；The 4th pin, the 5th pin, the 6th pin in the MicroUSB interface J1 and
7 pins are grounded；The pole G of the metal-oxide-semiconductor Q8 is connect with the collector of the triode Q7, the pole the D ground connection of the metal-oxide-semiconductor Q8,
The pole S of the metal-oxide-semiconductor Q8 is grounded.
The filtered electrical routing resistance R1 series capacitance C6 and capacitor C1 be simultaneously as a further improvement of the utility model,
The 1st pin in connection, one end of the capacitor C1 and the MicroUSB interface J1, the other end ground connection of the capacitor C1.
The resistance value of resistance R1 is 1 Ω, the appearance of capacitor C6 in the filter circuit as a further improvement of the utility model,
Value is 10 μ F, and the capacitance of capacitor C1 is 10 μ F.
The resistance value of the divider resistance R30 is 470 Ω, the divider resistance as a further improvement of the utility model,
The resistance value of R31 is 1.3k Ω, and the resistance value of the pull-up resistor R29 is 1k Ω.
The beneficial effects of the utility model are:
1, the utility model removes the base voltage of control triode Q7 by the stabilizing voltage characteristic curve of zener diode D1,
The on and off of triode Q7 is controlled, goes the on and off of control metal-oxide-semiconductor Q8 again then to carry out overvoltage protection.
2, the utility model is the overvoltage protection that can be achieved with circuit woth no need to the voltage protection circuit of chip class, meets day
The demand of cost control and overvoltage protection that benefit increases, and the circuit components of the utility model are few, principle is simple and easy to control, simple
It is single reliable.
Detailed description of the invention
Fig. 1 is the circuit diagram of the overvoltage crowbar based on triode of the utility model.
Fig. 2 is the Iz and Vz of the voltage-stabiliser tube diode D1 of the overvoltage crowbar based on triode of the utility model
Pressure stabilizing curve graph.
Fig. 3 is the Ic and V of the triode Q7 triode of the overvoltage crowbar based on triode of the utility modelBESong
Line chart.
Specific embodiment
The present invention will be further described for explanation and specific embodiment with reference to the accompanying drawing.
As shown in Figure 1, a kind of electricity of overvoltage crowbar based on triode for the optimum embodiment of the utility model
Lu Tu.
A kind of overvoltage crowbar based on triode of the utility model, comprising: MicroUSB interface J1, pressure stabilizing two
Pole pipe D1, divider resistance R30, divider resistance R31, triode Q7, pull-up resistor R29, filter circuit and metal-oxide-semiconductor Q8.
As shown in Figure 1, the 1st pin (VIN foot) in MicroUSB interface J1 respectively with the cathode of zener diode D1, on
One end of pull-up resistor R29 and one end of the capacitor C1 in filter circuit and resistance R1 are connected to voltage input end VIN；Pressure stabilizing
The anode of diode D1 is connect with one end of divider resistance R30, and the other end of divider resistance R30 connects two branches, one branch
Road is connect with one end of divider resistance R31, and the other end of resistance R31 is grounded (PGND)), the base of another branch and triode Q7
Pole connection, the base stage of specifically triode Q7 are connected between divider resistance R30 and divider resistance R31, the current collection of triode Q7
Pole is connect with the other end of pull-up resistor R29, and the emitter of triode Q7 is grounded (PGND)；The 4th in MicroUSB interface J1
Pin (ID foot), the 5th pin (GND foot), the 6th pin and the 7th pin are grounded (PGND)；The pole G of metal-oxide-semiconductor Q8 and triode Q7
Collector connection, the pole D of metal-oxide-semiconductor Q8 is grounded (GND), and the pole S of metal-oxide-semiconductor Q8 is grounded (PGND).It is supplied in the circuit of the present embodiment
Electricity only needs Input voltage terminal VIN to power, without in addition biasing power supply again.
Preferably, filtered electrical routing resistance R1 series capacitance C6 is in parallel with capacitor C1, one end of the capacitor C1 with
The other end of the 1st pin (VIN foot) in MicroUSB interface J1, the capacitor C1 is grounded (PGND).
Preferably, the resistance value of resistance R1 is 1 Ω in filter circuit, and the capacitance of capacitor C6 is 10 μ F, and the capacitance of capacitor C1 is
10μF。
Preferably, the resistance value of divider resistance R30 is 470 Ω, the resistance value of divider resistance R31 is 1.3k Ω, pull-up resistor
The resistance value of R29 is 1k Ω.
The basic principle of the circuit protection of the present embodiment is to go control three by the stabilizing voltage characteristic curve of zener diode D1
The base voltage of pole pipe Q7, to control the on and off of triode Q7, then go again control metal-oxide-semiconductor Q8 on and off from
And overvoltage protection is carried out, detailed process is: when input voltage VIN is in uphill process, as the V of triode Q7BEVoltage it is big
In the cut-in voltage 0.65V of triode, then triode Q7 is connected, the conducting of triode Q7 so that metal-oxide-semiconductor Q8 VGSIt is 0, then
Input ground is closed in metal-oxide-semiconductor Q8 cut-off.6V overvoltage protection may be implemented in the circuit of the utility model as a result, works as Input voltage terminal
When the input voltage of VIN is greater than 6V, input can be closed rapidly, when input voltage is less than 6V, opens input, thus real
Existing voltage protection.And in the present embodiment, the triode of the preferred model S8050 of triode Q7, the preferred A03400 type of metal-oxide-semiconductor Q8
Number, the on and off condition principle of device itself is common knowledge, is not repeated herein.
Further, for example, when the input voltage of Input voltage terminal VIN is 6V, the Ic electric current of triode Q7
For 6ma, at this point, passing through the Ic and V of triode Q7BECurve graph as shown in Fig. 3, can learn the V of corresponding triode Q7BE
Conducting voltage is 0.65V, therefore when triode Q7 is just connected, and is calculated, IBE=500 μ A, pass through zener diode D1
Id and Vz characteristic curve as shown in Fig. 2, the voltage for obtaining current voltage-stabiliser tube both ends is 4.9V, thus effective maintenance voltage
Stabilization and protection.
If again, the overvoltage protection voltage value of setting is 6y, then by calculating it is found that triode in the circuit of embodiment
The Ic electric current of Q7 is 6mA, then passes through the Ic and V of inquiry triode Q7BECharacteristic curve, it is known that current triode Q7
Conducting voltage VBEFor 0.66V (25 degree of characteristic curves), by the characteristic curve of the Id and Vz of zener diode D1 as shown in Fig. 2,
Obtain the voltage at current voltage-stabiliser tube both ends, it is assumed that Vz=5.1v must then know that the overall presure drop of R30 and R31 is 0.9V, pass through
VR31=0.66V can so calculate the resistance ratio of R30 and R31, it can thus be appreciated that the specific data of R30 and R31 can be according to need
It goes to change, their resistance value size also will affect the pressure drop of voltage-stabiliser tube, therefore, by adjusting divider resistance R30 and partial pressure electricity
The size of resistance R31 can adjust the size of protection voltage, and divider resistance R30 is smaller, and divider resistance R31 is bigger, cut-in voltage
It is lower, it is on the contrary then cut-in voltage is higher, to realize adjusting protection.
In conclusion the utility model goes the base stage of control triode Q7 by the stabilizing voltage characteristic curve of zener diode D1
Then voltage goes the on and off of control metal-oxide-semiconductor Q8 thus to carry out to control the on and off of triode Q7 again
Pressure protection.In addition, the voltage protection circuit that the utility model does not need chip class can be achieved with the overvoltage protection of circuit, meet day
The demand of cost control and overvoltage protection that benefit increases, and the circuit components of the utility model are few, principle is simple and easy to control, simple
It is single reliable.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (4)
1. a kind of overvoltage crowbar based on triode, it is characterised in that: include: MicroUSB interface J1, zener diode
D1, divider resistance R30, divider resistance R31, triode Q7, pull-up resistor R29, filter circuit and metal-oxide-semiconductor Q8；
The 1st pin in the MicroUSB interface J1 respectively with one end of the cathode of zener diode D1, pull-up resistor R29 with
And one end of the capacitor C1 and resistance R1 in filter circuit are connected to voltage input end；
The anode of the zener diode D1 is connect with one end of the divider resistance R30, the other end of the divider resistance R30
Two branches are connected, one branch is connect with one end of the divider resistance R31, the other end ground connection of the resistance R31, another
Branch is connect with the base stage of the triode Q7, and the other end of the collector of the triode Q7 and the pull-up resistor R29 connect
It connects, the emitter ground connection of the triode Q7；
The 4th pin, the 5th pin, the 6th pin and the 7th pin in the MicroUSB interface J1 are grounded；
The pole G of the metal-oxide-semiconductor Q8 is connect with the collector of the triode Q7, the pole the D ground connection of the metal-oxide-semiconductor Q8, the metal-oxide-semiconductor
The pole S of Q8 is grounded.
2. the overvoltage crowbar according to claim 1 based on triode, it is characterised in that: the filter circuit is by electricity
Hinder the 1st pin that R1 series capacitance C6 is in parallel with capacitor C1, in one end of the capacitor C1 and the MicroUSB interface J1, institute
State the other end ground connection of capacitor C1.
3. the overvoltage crowbar according to claim 2 based on triode, it is characterised in that: electric in the filter circuit
The resistance value for hindering R1 is 1 Ω, and the capacitance of capacitor C6 is 10 μ F, and the capacitance of capacitor C1 is 10 μ F.
4. the overvoltage crowbar according to claim 1 based on triode, it is characterised in that: the divider resistance R30
Resistance value be 470 Ω, the resistance value of the divider resistance R31 is 1.3k Ω, the resistance value of the pull-up resistor R29 is 1k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331471.4U CN208423764U (en) | 2018-03-12 | 2018-03-12 | A kind of overvoltage crowbar based on triode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331471.4U CN208423764U (en) | 2018-03-12 | 2018-03-12 | A kind of overvoltage crowbar based on triode |
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| Publication Number | Publication Date |
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| CN208423764U true CN208423764U (en) | 2019-01-22 |
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| CN201820331471.4U Active CN208423764U (en) | 2018-03-12 | 2018-03-12 | A kind of overvoltage crowbar based on triode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617266A (en) * | 2020-12-17 | 2021-04-09 | 西南大学 | Tobacco flue-curing controller interface circuit compatible with two sensors and control method |
-
2018
- 2018-03-12 CN CN201820331471.4U patent/CN208423764U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617266A (en) * | 2020-12-17 | 2021-04-09 | 西南大学 | Tobacco flue-curing controller interface circuit compatible with two sensors and control method |
| CN112617266B (en) * | 2020-12-17 | 2022-03-01 | 西南大学 | Tobacco flue-curing controller interface circuit compatible with two sensors and control method |
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