CN207218229U - A kind of active direct current supply polar protective circuit - Google Patents
A kind of active direct current supply polar protective circuit Download PDFInfo
- Publication number
- CN207218229U CN207218229U CN201720914424.8U CN201720914424U CN207218229U CN 207218229 U CN207218229 U CN 207218229U CN 201720914424 U CN201720914424 U CN 201720914424U CN 207218229 U CN207218229 U CN 207218229U
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- China
- Prior art keywords
- nmos tube
- power supply
- protective circuit
- direct current
- polar protective
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Abstract
It the utility model is related to polar protective circuit; specific embodiment discloses a kind of polar protective circuit of active direct current supply; it is arranged between power supply and load; the positive terminal of power supply electrically connects with the positive terminal loaded; including NMOS tube; NMOS tube grid electrically connects with the positive terminal of power supply, and NMOS tube source electrode electrically connects with the negative pole end loaded, and NMOS tube drain electrode electrically connects with the negative pole end of power supply.The polar protective circuit solves the problems, such as protection and the self- recoverage of direct current supply input reverse polarity connection, and the polar protective circuit does not have any infringement to former power supply circuit, and after power supply polarity is correct, normal power supply is recovered in port immediately, has accomplished lossless protection and fast quick-recovery.
Description
Technical field
It the utility model is related to polar protective circuit, and in particular to a kind of polar protective circuit of active direct current supply.
Background technology
Existing direct current supply polar protective circuit, mainly reach power supply polarity using the single-phase conductive characteristic of diode
Protect purpose.To the more sensitive occasion of power dissipation ratio of powering, particularly load current is big, the low place of supply voltage, due to negative
Load electric current is big, diode drop VF is big, and some seriously limits its application up to 1.3V.When BMS is applied, each battery core with
Sampling, be complicated more than balanced wire harness between BMS, is easy to damage because of interface circuit polarity wrong in production and debugging process
BMS equipment, battery core voltage is generally between 2V-3.8V in addition, if using existing Diode series in the side of current supply circuit
Formula, as shown in figure 1, can be big because of the VF voltages of diode, BMS will be unable to normal work.
As shown in Fig. 2 it is another form of existing polar protective circuit.Although the circuit has evaded diode VF to supplying
The influence of electric loading, but in practical application, during because of user port direct current supply reverse polarity connection, safety element F will burn, and cause
Circuit damages, and needs professional to repair.This polarity protection be using damage safety element protect load supplying loop as
Cost, use very inconvenient.
Utility model content
In view of this, the application provides a kind of simple in construction, carry out polarity protection that can be lossless, the fast quick-recovery of and can
Active direct current supply polar protective circuit.
To solve above technical problem, technical scheme provided by the utility model is a kind of active direct current supply polarity protection
Circuit, it is arranged between power supply and load, the positive terminal of the power supply electrically connects with the positive terminal loaded, including
NMOS tube, the NMOS tube grid electrically connect with the positive terminal of the power supply, the NMOS tube source electrode and the load
Negative pole end electrically connects, and the NMOS tube drain electrode electrically connects with the negative pole end of the power supply.
Preferably, resistance is provided between the NMOS tube grid and the positive terminal of the power supply, the resistance
One end electrically connects with the positive terminal of the power supply, and the other end of the resistance electrically connects with the NMOS tube grid.
Preferably, the active direct current supply polar protective circuit also includes voltage-regulator diode, and the voltage-regulator diode is just
Pole electrically connects with the NMOS tube source electrode, and the negative pole of the voltage-regulator diode electrically connects with the NMOS tube grid.
Preferably, it is provided with parasitic diode between the NMOS tube source electrode and NMOS tube drain electrode.
Preferably, the parasitic diode is crystal diode.
Preferably, the NMOS tube is enhanced NMOS tube.
Compared with prior art, its advantage describes in detail as follows the application：Active direct current provided by the utility model
Power polar protective circuit, when NMOS tube grid and voltage between source electrodes are that Vgs voltages reach conducting main entrance and prescribed a time limit NMOS tube ability
Conducting, so VCC ends polarity must is fulfilled for as positive potential, when reaching cut-in voltage Vgs (on), NMOS can just be turned on, and port is
Can be normally load supplying.On state resistance Rds (on) is very low between its drain electrode and source electrode after NMOS conductings, and load current is lossless to be passed through
Protection circuit, and when port powers reverse polarity connection, the Vgs voltages of NMOS tube are negative, and now NMOS is not turned on, and load can not be just
Often power supply.The polar protective circuit solves the problems, such as protection and the self- recoverage of direct current supply input reverse polarity connection, the polarity protection
Circuit does not have any infringement to former power supply circuit, and after power supply polarity is correct, normal power supply is recovered in port immediately, has accomplished lossless guarantor
Shield and fast quick-recovery.
Brief description of the drawings
Fig. 1 is a kind of polar protective circuit schematic diagram of prior art；
Fig. 2 is another polar protective circuit schematic diagram of prior art；
Fig. 3 is the circuit theory diagrams of the utility model embodiment；
Fig. 4 is another circuit theory diagrams of the utility model embodiment；
Fig. 5 is the application structure schematic diagram of the utility model embodiment.
Embodiment
In order that those skilled in the art more fully understands the technical solution of the utility model, below in conjunction with the accompanying drawings and have
The utility model is described in further detail for body embodiment.
As shown in figure 3, the utility model embodiment 1 provides a kind of active direct current supply polar protective circuit, confession is arranged on
Between power supply and load, the positive terminal of power supply electrically connects with the positive terminal of load, including NMOS tube, NMOS tube grid and
The positive terminal electrical connection of power supply, NMOS tube source electrode electrically connect with the negative pole end loaded, NMOS tube drain electrode and power supply
Negative pole end electrically connects.Parasitic diode is provided between NMOS tube source electrode and NMOS tube drain electrode.Parasitic diode is the pole of crystal two
Pipe.The NMOS tube is enhanced NMOS tube.
As shown in figure 4, the utility model embodiment 2 provides another active direct current supply polar protective circuit, implementing
On the basis of example 1, resistance, one end of resistance and power supply are provided between NMOS tube grid and the positive terminal of power supply
Positive pole electrical connection, the other end of resistance electrically connects with NMOS tube grid.The polar protective circuit also includes voltage-regulator diode, surely
The positive pole of pressure diode electrically connects with NMOS tube source electrode, and the negative pole of voltage-regulator diode electrically connects with NMOS tube grid.
Polar protective circuit provided by the utility model has mainly used active device NMOSFET pipe, resistance R and steady
Pressure diode DZ1 be used to protecting NMOS tube will not because high voltage applications occasion and caused by damage.Due between Q1 grid and source electrode
Voltage (Vgs voltages) is typically larger than 20V, can not have to R and DZ1 in below 2-15V power-supplying circuits.R is steady in circuit
Diode DZ1 is pressed to provide current limliting, protection voltage-regulator diode DZ1.Voltage-regulator diode DZ1 effects are protection NMOS tube Q1, play clamper
Effect, makes Q1 Vgs voltage power supplies in the range of safe voltage.
In the polar protective circuit, NMOS tube Q1 grid and voltage between source electrodes (Vgs voltages) reach conducting main entrance and prescribed a time limit
NMOS tube could turn on, so only work as VCC ends polarity meets to be positive potential, when reaching cut-in voltage Vgs (th), NMOS just meetings
Conducting, port could be normally load supplying.On state resistance Rds (on) is very low between its drain electrode and source electrode after NMOS conductings, load
Electric current is lossless by protection circuit, and when port powers reverse polarity connection, and NMOS tube Q1 Vgs voltages are negative, and now NMOS is not
Conducting, load are unable to normal power supply, and the anti-phase blocking effect of Q1 parasitic diode, does not have any infringement to circuit in addition,
After polarity of powering is correct, normal power supply is recovered in port immediately, has accomplished lossless protection and fast quick-recovery.
As shown in figure 5, active direct current supply polar protective circuit provided by the utility model is applied to BMS battery managements system
In system, the polar protective circuit is arranged at the access that each battery core inputs to BMS, and P is the interface of BMS and battery core in figure,
CH1-CH10 represents the positive pole input of 10 battery cores, and the negative pole of battery core is directly connected to GND as common port and used.
It the above is only preferred embodiment of the present utility model, it is noted that above-mentioned preferred embodiment should not regard
For that should be defined to limitation of the present utility model, the scope of protection of the utility model by claim limited range.For
For those skilled in the art, do not departing from spirit and scope of the present utility model, can also make some
Improvements and modifications, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (6)
1. a kind of active direct current supply polar protective circuit, it is arranged between power supply and load, the power supply is just
Extremely electrically connected with the positive terminal of load, it is characterised in that including NMOS tube, the NMOS tube grid and the power supply
Positive terminal electrically connects, and the NMOS tube source electrode electrically connects with the negative pole end of the load, the NMOS tube drain electrode and the power supply
The negative pole end electrical connection of power supply.
2. active direct current supply polar protective circuit according to claim 1, it is characterised in that the NMOS tube grid with
Resistance is provided between the positive terminal of the power supply, one end of the resistance and the positive terminal of the power supply are electrically connected
Connect, the other end of the resistance electrically connects with the NMOS tube grid.
3. active direct current supply polar protective circuit according to claim 1, it is characterised in that also including the pole of voltage stabilizing two
Pipe, the positive pole of the voltage-regulator diode electrically connect with the NMOS tube source electrode, the negative pole of the voltage-regulator diode and the NMOS
Tube grid electrically connects.
4. active direct current supply polar protective circuit according to claim 1, it is characterised in that the NMOS tube source electrode with
Parasitic diode is provided between NMOS tube drain electrode.
5. active direct current supply polar protective circuit according to claim 4, it is characterised in that the parasitic diode is
Crystal diode.
6. active direct current supply polar protective circuit according to claim 1, it is characterised in that the NMOS tube is enhancing
Type NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720914424.8U CN207218229U (en) | 2017-07-26 | 2017-07-26 | A kind of active direct current supply polar protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720914424.8U CN207218229U (en) | 2017-07-26 | 2017-07-26 | A kind of active direct current supply polar protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218229U true CN207218229U (en) | 2018-04-10 |
Family
ID=61814200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720914424.8U Active CN207218229U (en) | 2017-07-26 | 2017-07-26 | A kind of active direct current supply polar protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207218229U (en) |
-
2017
- 2017-07-26 CN CN201720914424.8U patent/CN207218229U/en active Active
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| GR01 | Patent grant |