CN207321095U - A kind of protection not exported altogether and Hysteresis control circuit - Google Patents
A kind of protection not exported altogether and Hysteresis control circuit Download PDFInfo
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- CN207321095U CN207321095U CN201721268968.8U CN201721268968U CN207321095U CN 207321095 U CN207321095 U CN 207321095U CN 201721268968 U CN201721268968 U CN 201721268968U CN 207321095 U CN207321095 U CN 207321095U
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Abstract
A kind of protection not exported altogether and Hysteresis control circuit are the utility model is related to, applied to power supply, first switch and controller, further include：Overvoltage/current foldback circuit, is connected with first switch, is closed in power supply overvoltage/overcurrent according to the enabled control signal control controller received；Stagnant loop circuit, is connected with first switch and overvoltage/current foldback circuit, for increasing the voltage hysteresis being switched on or off of controller when controller is switched on or off, stablizes controller and opens or stablize shut-off；First switch is connected with the feeder ear and controller of power supply respectively, the supply voltage on or off exported according to the feeder ear of power supply.The voltage hysteresis being switched on and off of controller when the utility model can increase negative voltage output; stabilize being switched on and off for controller; avoid controller from starting back and forth near unlatching threshold voltage, can also realize overvoltage or the quick protection of overcurrent, effectively protect device.
Description
Technical field
The utility model is related to the technical field of power supply, more specifically to a kind of protection not exported altogether with it is stagnant
Loop control circuit.
Background technology
Switching Power Supply usually requires negative pressure output, when generating positive and negative voltage and when depositing output, since generating positive and negative voltage exists not altogether
The difference in difference and control mode in processing, existing processing mode often have ignored the generating positive and negative voltage not difference on ground altogether
And various problems are caused to occur.The processing mode same with positive voltage the output phase is also used for negative voltage output, this mode is normal
The problems such as causing control accuracy poor.
For example, the supply voltage of Switching Power Supply control IC often causes to control when shaking near the threshold range for controlling IC
IC processed is restarted back and forth, reduces the stability that control IC is switched on and off, for this kind of situation, if not for generating positive and negative voltage not
Difference altogether is handled, then is extremely difficult to improved effect, it is impossible to ensures the stability for controlling IC to be switched on and off.
When and for example, if there is overcurrent or overpressure situation, if for generating positive and negative voltage, the difference on ground is not handled altogether,
It also is difficult to achieve the purpose that overcurrent or overvoltage protection.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of the prior art, there is provided it is a kind of not altogether
The protection of output and Hysteresis control circuit.
Technical solution is used by the utility model solves its technical problem：Construct a kind of protection not exported altogether with
Hysteresis control circuit, applied to power supply, including first switch and controller, further includes：
Overvoltage/current foldback circuit, is connected with the first switch, is made in power supply overvoltage/overcurrent according to what is received
Can control signal control controller closing；
Stagnant loop circuit, is connected with the first switch and the overvoltage/current foldback circuit, for being opened in the controller
The voltage hysteresis being switched on or off of the controller is opened or increased when turning off, is closed so that the controller is stablized to open or stablize
It is disconnected；
The first switch is connected with the feeder ear of power supply and the controller respectively, defeated according to the feeder ear of the power supply
The supply voltage on or off gone out.
Preferably, the first pressure sampling circuit being connected respectively with the feeder ear of the first switch and power supply is further included,
For carrying out partial pressure sampling the first sampled voltage of output to the supply voltage；
First sampled voltage is used to control the first switch on or off.
Preferably, the first switch is triode, and first pressure sampling circuit includes the first divider resistance and the
Two divider resistances；
First divider resistance and the second divider resistance are sequentially connected in series feeder ear and first switch in the power supply
Between base stage；The emitter of the first switch is connected with the feeder ear of the power supply, the collector of the first switch and institute
State the enabled pin connection of controller.
Preferably, the clamp circuit and second that the stagnant loop circuit includes being connected with first pressure sampling circuit is opened
Close, the clamp circuit is equipped with the first clamp voltage and the second clamp voltage；
The second switch respectively with the first switch, the overvoltage/current foldback circuit and the clamp circuit
Connection, and turned on when the supply voltage reaches first clamp voltage based on first sampled voltage so that the control
Device processed, which is stablized, to be opened；Or turned off when the supply voltage reaches second clamp voltage based on first sampled voltage
So that the controller stablizes shut-off.
Preferably, the clamp circuit includes the first voltage-stabiliser tube and the second voltage-stabiliser tube, and the second switch is metal-oxide-semiconductor；
The anode of first voltage-stabiliser tube is connected with first pressure sampling circuit, the cathode of first voltage-stabiliser tube with
The anode connection of second voltage-stabiliser tube, the cathode of second voltage-stabiliser tube is connected with the source electrode of the second switch, and described the
The source electrode of two switches is additionally coupled to the overvoltage/current foldback circuit, the drain electrode of the second switch and first voltage-stabiliser tube
Connected with the connecting node of the second voltage-stabiliser tube, the grid of the second switch is connected with the collector of the first switch.
Preferably, the overvoltage/current foldback circuit includes current-limiting resistance and the 3rd switch；3rd switch is MOS
Pipe；
The first end of the current-limiting resistance is connected with providing the input terminal of voltage for the overvoltage/mistake note protection circuit, institute
The second end for stating current-limiting resistance is connected with the grid of the described 3rd switch, and the grid of the 3rd switch is also with providing described enable
The detection circuit connection of control signal, the drain electrode of the 3rd switch are connected with the source electrode of the second switch, and the described 3rd
The drain electrode of switch is also connected with first pressure sampling circuit, the source electrode ground connection of the 3rd switch；
Or the drain electrode of the 3rd switch is also connected by the clamp circuit with first pressure sampling circuit.
Preferably, the second switch and the 3rd switch are an integrated metal-oxide-semiconductor.
Preferably, the second pressure sampling circuit is further included, second pressure sampling circuit is connected to the controller
Enable between pin and the first switch, for carrying out partial pressure sampling to the supply voltage when the first switch is turned on
The second sampled voltage is generated to control the controller to open.
Preferably, second pressure sampling circuit includes the 4th divider resistance and the 8th divider resistance；
The first end of 4th divider resistance is connected with the collector of the first switch, the 4th divider resistance
Second end connects reference ground by the 8th divider resistance；Section between 4th divider resistance and the 8th divider resistance
Point is additionally coupled to the enabled pin of controller；
Node voltage between 4th divider resistance and the 8th divider resistance is second sampled voltage.
Preferably, the soft starting circuit being connected between the soft start pin of the controller and reference ground, institute are further included
Stating soft starting circuit includes soft start capacitor and soft start resistance；
The first end of the soft start capacitor is connected with the soft start pin, the second termination ginseng of the soft start capacitor
Ground is examined, it is in parallel with the soft start capacitor that the software starts resistance.
Implement the protection not exported altogether and Hysteresis control circuit of the utility model, have the advantages that：This practicality
Novel pin is to power supply generating positive and negative voltage and there is the not situation altogether when exporting, and adds the unlatching of the controller when negative voltage exports
With the voltage hysteresis of shut-off, being switched on and off for controller is stabilized, avoids controller from being opened back and forth near unlatching threshold voltage
It is dynamic, reduce the stability and reliability of controller；And can also realize overvoltage or the quick protection of overcurrent, effectively protect device.
Brief description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural representation of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments one
Figure；
Fig. 2 is the structural representation of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments two
Figure；
Fig. 3 is the circuit theory of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments two
Figure.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is described in detail the utility model.
The protection not exported altogether of the utility model mainly solves the positive output end and electricity of power supply with Hysteresis control circuit
The master control IC in the source not situations on ground altogether, i.e., at this time, the ground terminal of master control IC is using the negative output terminal of power supply as with reference to ground, and power supply
Positive output end ground connection.The not difference of the difference condition on ground and control mode altogether when being exported for generating positive and negative voltage, the utility model
A kind of protection not exported altogether and Hysteresis control circuit are provided, effectively can protect master control in the case where not exporting altogether
IC and power device, avoid overvoltage or overcurrent and damage master control IC or power device, while can also increase master control IC unlatching and
Voltage hysteresis is turned off, master control IC is stably switched on and off, improves the stability and reliability of power supply.
Refering to Fig. 1, Fig. 1 is the knot of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments one
Structure schematic diagram.
As shown in Figure 1, the protection not exported altogether of the present embodiment includes first switch 10, control with Hysteresis control circuit
Device 40, overvoltage/current foldback circuit 20 and stagnant loop circuit 30, first switch 10 are connected with the feeder ear and controller 40 of power supply,
Overvoltage/current foldback circuit 20 is connected with 10 pipe of first switch, stagnant loop circuit 30 and first switch 10 and overvoltage/overcurrent protection electricity
Road 20 connects.
It is to be appreciated that the protection not exported altogether in the present embodiment is operated in power supply as just with Hysteresis control circuit
Negative voltage and the situation for depositing output, and the feeder ear of controller 40 (i.e. the master control IC of power supply) and power supply is not altogether, i.e., in this reality
To apply in example, controller 40 is using negative voltage output as reference ground, and the feeder ear (positive voltage output) of power supply is directly grounded, for example,
The positive voltage output of the feeder ear of power supply is+12V, and the negative voltage output of power supply is -12V, then the feeder ear (+12V) of power supply connects
Ground, the ground terminal of controller 40 is using -12V as reference ground.
Wherein, overvoltage/current foldback circuit 20, is connected with first switch 10, and in power supply overvoltage or overcurrent according to institute
The enabled control signal control controller 40 received is closed, so that controller 40 is stopped, realizes the overvoltage to controller 40
Or overcurrent protection.
It is to be appreciated that overvoltage/the current foldback circuit 20 of the present embodiment can be realized by switching tube.Enabled control signal can
There is provided by detection circuit (such as voltage/current detection circuit) internal in power supply, the voltage by detection circuit to power source internal
Or electric current is detected in real time, enabled control signal is exported when overvoltage or overcurrent occurs in power supply to overvoltage/overcurrent protection electricity
Road 20, controller 40 is controlled by overvoltage/current foldback circuit 20, and then controller 40 is closed to achieve the purpose that protection.Into
One step, the present embodiment can realize the overvoltage to controller 40 or the quick protection of overcurrent using switching tube, avoid controller 40
Damaged because of overvoltage or overcurrent work.
Stagnant loop circuit 30, is connected with first switch 10 and overvoltage/current foldback circuit 20, for opening in controller 40 or
Increase the voltage hysteresis being switched on or off of controller 40 during shut-off, stablize controller 40 and open or stablize shut-off.It can manage
Xie Di, by setting stagnant loop circuit 30 to increase the voltage hysteresis being switched on or off of controller 40, it is possible to prevente effectively from control
The phenomenon that device 40 is restarted back and forth in its threshold voltage, enhances the stability and reliability of controller 40.
Preferably, the stagnant loop circuit 30 of the present embodiment can be realized by the combination of clamp circuit 301 and switching tube, its
In, clamp circuit 301 can realize clamping action to the supply voltage of power supply side, by supply voltage clamper in clamp circuit
The clamp voltage of 301 settings.For example, when in the supply voltage uphill process that the feeder ear of power supply is accessed, due to clamp circuit
301 effect, when supply voltage reaches the clamp voltage of the setting of clamp circuit 301, controller 40 is just opened, according to setting for circuit
Meter, usually, the clamp voltage that clamp circuit 301 is set are higher than the unlatching threshold voltage of controller 40, and therefore, controller 40 is opened
Cut-in voltage when opening is higher than the unlatching threshold voltage of controller 40, and controller 40 can stablize unlatching.Similarly, when the power supply of power supply
When the accessed supply voltage in end slowly declines, due to the effect of clamp circuit 301, controller 40 can also stablize shut-off.
First switch 10, is connected with the feeder ear and controller 40 of power supply respectively, the confession exported according to the feeder ear of power supply
Piezoelectric voltage on or off.It is to be appreciated that first switch 10 is arranged between the feeder ear of power supply and controller 40, and also divide
It is not connected with overvoltage/current foldback circuit 20 and stagnant loop circuit 30, the supply voltage exported according to the feeder ear of power supply turns on
Or shut-off, and control 40 quick closedown of controller is combined with overvoltage/current foldback circuit 20 in power supply overvoltage or overcurrent, with
Reach rapid overpressure or overcurrent protection；Or opening for increase controller 40 is combined with stagnant loop circuit 30 in electric power starting or shut-off
Open voltage hysteresis or shut-off voltage hysteresis, it is ensured that controller 40 can stablize unlatching or stablize shut-off.
Preferably, the first switch 10 of the present embodiment can use triode, for example, may include but be not limited to model
The triode of PMBT2907A.
Refering to Fig. 2, Fig. 2 is the knot of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments two
Structure schematic diagram.
As shown in Fig. 2, the protection not exported altogether of the present embodiment includes first switch 10, mistake with Hysteresis control circuit
Pressure/current foldback circuit 20, stagnant loop circuit 30, controller 40, the first pressure sampling circuit 50 and the second pressure sampling circuit
60, feeder ear of first pressure sampling circuit 50 respectively with first switch 10 and power supply is connected, and the first pressure sampling circuit 50
Also it is connected with overvoltage/current foldback circuit 20 and stagnant loop circuit 30, first switch 10 is connected with the feeder ear of power supply, and first opens
Also distinguish sample circuit by second and be connected with controller 40 in pass 10.
Specifically, the first pressure sampling circuit 50 includes being arranged between first switch 10 and the feeder ear of power supply, is used for
The supply voltage exported to the feeder ear of power supply carries out partial pressure sampling and exports the first sampled voltage, wherein, the first sampling electricity
Pressure is used to control 10 on or off of first switch.It is to be appreciated that first pressure sampling circuit 50 of the present embodiment can be by more
A resistance series connection is realized, partial pressure can be carried out to supply voltage by series resistance, and produces corresponding partial pressure value, which can
For controlling the on or off of first switch 10.
Preferably, in the present embodiment, first switch 10 is triode, and the first pressure sampling circuit 50 includes the first partial pressure
Resistance and the second divider resistance.First divider resistance and the second divider resistance are sequentially connected in series the feeder ear and first switch 10 of power supply
Base stage between；The emitter of first switch 10 and the feeder ear of power supply connect, collector and the controller 40 of first switch 10
Enabled pin connection.It is to be appreciated that the node voltage between the base stage of the second divider resistance and first switch 10 is
One sampled voltage.When the first sampled voltage reaches the conducting voltage of first switch 10, first switch 10 turns on.
Stagnant loop circuit 30 includes clamp circuit 301 and second switch 302, wherein, the sampling of 301 and first partial pressure of clamp circuit
Circuit 50 connects.As shown in Fig. 2, the clamp circuit 301 of the present embodiment is also connected with second switch 302.
Preferably, the clamp circuit 301 of the present embodiment is equipped with clamp voltage, specifically includes the first clamp voltage and the second pincers
Position voltage.Due to the effect of clamp circuit 301, first sampled voltage is by clamp circuit caused by the first pressure sampling circuit 50
The clamp voltage of 301 settings influences.Specifically, during the supply voltage that the feeder ear of power supply is inputted slowly rises,
Clamp circuit 301 realizes clamping action to supply voltage, when supply voltage reaches the first clamp voltage of clamp circuit 301
When, the first sampled voltage caused by the first bleeder circuit just reaches the conducting voltage of first switch 10, and first switch 10 turns on,
The supply voltage of the feeder ear output of power supply is transmitted to the enabled pin of controller 40 through first switch 10, and controller 40 is opened.
Since the first clamp voltage is higher than the unlatching threshold voltage of controller 40, controller 40 can stablize unlatching, pass through stagnant ring
The effect of circuit 30 causes controller 40 is stablized to open.
Further, the clamp circuit 301 of the present embodiment includes the first voltage-stabiliser tube and the second voltage-stabiliser tube, second switch 302
For metal-oxide-semiconductor.
The anode of first voltage-stabiliser tube is connected with the first pressure sampling circuit 50, the cathode of the first voltage-stabiliser tube and the second voltage-stabiliser tube
Anode connection, the cathode of the second voltage-stabiliser tube is connected with the source electrode of second switch 302, and the source electrode of second switch 302 is additionally coupled to
Overvoltage/current foldback circuit 20, the drain electrode of second switch 302 are connected with the connecting node of the first voltage-stabiliser tube and the second voltage-stabiliser tube,
The grid of second switch 302 is connected with the collector of first switch 10.
Wherein, threshold voltage and second voltage-stabiliser tube of the first clamp voltage that clamp circuit 301 is set as the first voltage-stabiliser tube
The sum of threshold voltage, the second clamp voltage is the threshold voltage of the first voltage-stabiliser tube.
As before, when supply voltage reaches the first clamp voltage, first switch 10 turns on, and second switch 302 is also led at the same time
Logical, since second switch 302 is in the conduction state, the second voltage-stabiliser tube is bypassed by second switch 302, at this time, if first switch 10
Off state is returned from conducting, supply voltage have to be lower than the threshold voltage of the first voltage-stabiliser tube, i.e. the second clamp voltage, and at this time
Supply voltage has reached the first clamp voltage, it is impossible to which moment is down to the second clamp voltage, and therefore, controller 40 can be stablized
Open, not only increase the stagnant ring of cut-in voltage of controller 40, and efficiently avoid controller 40 and opening threshold voltage
Nearby restart back and forth.
Similarly, when supply voltage drops to the second clamp voltage, first switch 10 turns off, and second switch 302 turns off, the
Two voltage-stabiliser tubes will be cut in circuit again, and the enabled voltage on the enabled pin of controller 40 disconnects, and controller 40 is closed, if at this time
First switch 10 returns to conducting state from shut-off, and supply voltage necessarily be greater than the threshold voltage of the first voltage-stabiliser tube and the second voltage-stabiliser tube
The sum of, i.e. the first clamp voltage, and supply voltage has dropped to the second clamp voltage at this time, it is impossible to moment rises to the first pincers
Position voltage, therefore, controller 40 can stablize closing, effectively increase the shut-off voltage hysteresis of controller 40, avoid control
Device 40 processed is restarted back and forth near shut-off threshold voltage.
It is to be appreciated that first voltage-stabiliser tube of the present embodiment can use the voltage-stabiliser tube of model MM5Z6V8T1, the second voltage stabilizing
Pipe can use the voltage-stabiliser tube of model MM5Z3V3T1.In order to ensure controller 40 can stablize unlatching and stablize shut-off, this implementation
The threshold voltage of first voltage-stabiliser tube of example is more than the threshold voltage of the second voltage-stabiliser tube.Wherein, the first voltage-stabiliser tube and the second voltage-stabiliser tube
Specific threshold voltage can be set according to actual circuit, however it is not limited to foregoing voltage-stabiliser tube.
Overvoltage/current foldback circuit 20 includes current-limiting resistance and the 3rd switch 201.Preferably, in the present embodiment, the 3rd
Switch 201 is metal-oxide-semiconductor.
Wherein, the first end of current-limiting resistance is connected with providing the input terminal of voltage for overvoltage/cross note protection circuit, and current limliting is electric
The second end of resistance is connected with the grid of the 3rd switch 201, and the grid of the 3rd switch 201 also enables the detection of control signal with providing
Circuit connects, and the drain electrode of the 3rd switch 201 is connected with the source electrode of second switch 302, and the 3rd switchs 201 drain electrode also with first
Pressure sampling circuit 50 connects, the source electrode ground connection of the 3rd switch 201.
Or the 3rd switch 201 drain electrode be also connected by clamp circuit 301 with the first pressure sampling circuit 50.
Preferably, the switch of second switch 302 and the 3rd 201 of the present embodiment is an integrated metal-oxide-semiconductor, i.e. second switch
302 and the 3rd switch 201 can be integrated into a metal-oxide-semiconductor by two metal-oxide-semiconductors.By the way that two metal-oxide-semiconductors are integrated into a metal-oxide-semiconductor
The design space of circuit, area occupied smaller can be saved.It is to be appreciated that the switch of second switch 302 and the 3rd 201 can also
For two independent metal-oxide-semiconductors, the function that it is realized is as hereinbefore.
Alternatively, the protection not exported altogether of the present embodiment further includes the second partial pressure sampling electricity with Hysteresis control circuit
Road 60, wherein, the second pressure sampling circuit 60 is connected between the enabled pin of controller 40 and first switch 10, for
Partial pressure sampling the second sampled voltage of generation is carried out during one 10 conducting of switch to supply voltage so that controller 40 is opened.
Second pressure sampling circuit 60 includes the 4th divider resistance and the 8th divider resistance, wherein, the 4th divider resistance
First end is connected with the collector of first switch 10, and the second end of the 4th divider resistance connects reference ground by the 8th divider resistance；
Node voltage between 4th divider resistance and the 8th divider resistance is the second sampled voltage.
Alternatively, the protection not exported altogether of the present embodiment further includes with Hysteresis control circuit and is connected to controller 40
Soft start pin and reference ground between soft starting circuit 70.Soft starting circuit 70 includes soft start capacitor and soft start electricity
Resistance, the first end of soft start capacitor are connected with soft start pin, and the second termination reference ground of soft start capacitor, software starts resistance
It is in parallel with soft start capacitor.
By setting soft starting circuit 70 to may be such that power supply in opening process, pass through slowly filling to soft start capacitor
Electricity, may be such that controller 40 can the voltage based on soft start capacitor slowly opened as reference voltage, reached the mesh of soft start
, effectively protect controller 40 to be damaged because moment opens.
In addition, by the soft start resistance in parallel on soft start capacitor, it may be such that when controller 40 turns off, soft start electricity
Voltage in appearance can quickly be released by soft start resistance.
Refering to Fig. 3, Fig. 3 is the electricity of a kind of protection not exported altogether of the utility model and Hysteresis control circuit embodiments two
Road schematic diagram.
As shown in figure 3, the first voltage-stabiliser tube of the embodiment uses the voltage-stabiliser tube of MM5Z6V8T1, the second voltage-stabiliser tube uses
The voltage-stabiliser tube of MM5Z3V3T1；First switch 10 uses the triode BCQ1 of PMBT2907A, and controller 40 uses ISL65451BZ
BCU1IC, the switch of second switch 302 and the 3rd 201 is that (wherein second switch 302 is metal-oxide-semiconductor to an integrated metal-oxide-semiconductor BCQ2
The right side Mos pipes of BCQ2, the 3rd switch 201 are managed for the left side Mos of metal-oxide-semiconductor BCQ2, for ease of description, hereafter metal-oxide-semiconductor BCQ2
Right side Mos represents that the left side Mos of metal-oxide-semiconductor BCQ2 is represented with the 3rd Mos pipes with the 2nd Mos pipes).
Specifically, the first pressure sampling circuit 50 includes the first divider resistance BCR1 and the second divider resistance BCR2, and first
Divider resistance BCR1 and the second divider resistance BCR2 are sequentially connected in series between the feeder ear of power supply and the base stage of triode BCQ1；Three poles
The emitter of pipe BCQ1 and the feeder ear (+12V) of power supply connect, the collector of triode BCQ1 and the enabled pin of controller 40
Connection.
Clamp circuit 301 includes the first voltage-stabiliser tube BCZD1 and the second voltage-stabiliser tube BCZD2
Node between the anode of first voltage-stabiliser tube BCZD1 and the first divider resistance BCR1 and the second divider resistance BCR2 connects
Connect, the cathode of the first voltage-stabiliser tube BCZD1 is connected with the anode of the second voltage-stabiliser tube BCZD2, the cathode of the second voltage-stabiliser tube BCZD2 and
The source electrode connection of two Mos pipes, the drain electrode of the source electrodes of the 2nd Mos pipes also with the 3rd Mos pipes be connecteds, the drain electrode of the 2nd Mos pipes and the
The connecting node of one voltage-stabiliser tube BCZD1 and the second voltage-stabiliser tube BCZD2 connect, the current collection of the 2nd BCZD1 grids and triode BCQ1
Pole connects.As shown in figure 3, drain electrode of the cathode of the second voltage-stabiliser tube BCZD2 also with the 3rd Mos pipes is connected.
Further, it is additionally provided with sampling resistor BCR12 between the grid and source electrode of the 2nd Mos pipes.
Overvoltage/current foldback circuit 20 includes 201 (i.e. the 3rd Mos pipes) of switch of current-limiting resistance BCR6 and the 3rd.
The first end of current-limiting resistance BCR6 is connected with providing the input terminal (+5Vsb) of voltage for overvoltage/mistake note protection circuit,
The second end of current-limiting resistance BCR6 is connected with the grid of the 3rd Mos pipes, and the grid of the 3rd Mos pipes is also with providing enabled control signal
Detection circuit (as shown in figure 3, the output terminal of detection circuit is -12V_EN) connection, the drain electrode of the 3rd Mos pipes also passes through clamper
Circuit 301 is connected (the i.e. drain electrode of the 3rd Mos pipes and the cathode company of the second voltage-stabiliser tube BCZD2 with the first pressure sampling circuit 50
Connect).
Second pressure sampling circuit 60 includes the 4th divider resistance BCR4 and the 8th divider resistance BCR8；
The first end of 4th divider resistance BCR4 is connected with the collector of triode BCQ1, and the of the 4th divider resistance BCR4
Two ends connect reference ground by the 8th divider resistance BCR8 (this reference ground is using -12V as the floating of reference)；4th divider resistance
Node between BCR4 and the 8th divider resistance BCR8 is additionally coupled to the enabled pin (BCU1 as shown in FIG. of controller 40
PIN_7 pins).
Wherein, the node voltage between the 4th divider resistance BCR4 and the 8th divider resistance BCR8 is the second sampled voltage.
Soft starting circuit 70 includes soft start capacitor BCC2 and soft start resistance BCR5；
The first end of soft start capacitor BCC2 is connected, soft start capacitor with soft start pin (the PIN_8 pins of BCU1)
The second termination reference ground (- 12V) of BCC2, it is in parallel with soft start capacitor BCC2 that software starts resistance BCR5.
As shown in figure 3, the grounding pin (PIN_GND) of controller BCU1 connects reference ground (- 12V), and the feeder ear of power supply
(+12) it is grounded, i.e., the feeder ear of the controller BCU1 of the present embodiment and power supply is not altogether.
To the circuit diagram of the concrete application embodiment of the utility model by taking the circuit diagram shown in Fig. 3 as an example
Illustrate.
In the present embodiment, the sum of threshold voltage of the first voltage-stabiliser tube BCZD1 and the second voltage-stabiliser tube BCZD2 is higher than controller
The unlatching threshold voltage of BCU1, the threshold voltage of the first voltage-stabiliser tube BCZD1 are higher than the shut-off threshold voltage of controller BCU1.First
The threshold voltage of voltage-stabiliser tube BCZD1 is 6.8V, and the threshold voltage of the second voltage-stabiliser tube BCZD2 is 3.3V.
In original state, triode BCQ1 shut-offs, the left side Mos conductings of BCQ2, right side Mos shut-offs.
As shown in figure 3, when detection circuit detects that power supply is in overvoltage or overcurrent, by controlling -12V_EN places
Voltage pull-down, and then the left side Mos of BCQ2 is turned off, since the left side Mos of BCQ2 is turned off, the first voltage-stabiliser tube BCZD1 and second
Voltage-stabiliser tube BCZD2 is also switched off by floating, the right side Mos of BCQ2, and triode BCQ1 is also switched off, since triode BCQ1 is turned off, control
The enabled pin (PIN_7) of device BCU1 processed cannot enable voltage, and controller BCU1 is stopped, and then realize overvoltage or mistake
Stream protection, and the control process is very fast, therefore, it can be achieved that rapidly switched off to controller BCU1, realizes overvoltage or overcurrent
Quick protection.
When in the slow uphill process of supply voltage that the feeder ear (+12V) of power supply exports, the first voltage-stabiliser tube BCZD1 and the
The clamp voltage that two voltage-stabiliser tube BCZD2 are formed realizes clamping action to supply voltage, when supply voltage reaches the first clamper electricity
During pressure, the first sampled voltage reaches the conducting voltage of triode BCQ1, and triode BCQ1 is turned on, at this time, the right side Mos of BCQ2
Conducting, since the right side Mos of BCQ2 is turned on, the second voltage-stabiliser tube BCZD2 is bypassed, and at this time, triode BCQ1 will be closed in switchback again
Disconnected state, the threshold voltage that supply voltage have to be lower than the first voltage-stabiliser tube BCZD1 could be realized, and supply voltage is first at this time
The sum of the threshold voltage of voltage-stabiliser tube BCZD1 and the second voltage-stabiliser tube BCZD2 (10.1V), it is impossible to mutation to the first voltage-stabiliser tube BCZD1
Threshold voltage (6.8V), therefore, obtained the stagnant ring of cut-in voltage of 3.3V, controller BCU1 can stablize unlatching, effectively keep away
Exempt from controller BC U1 to occur to restart back and forth when its threshold range is shaken.
When the supply voltage that the feeder ear (+12V) of power supply exports is slowly drop down to the second clamp voltage, triode BCQ1
Shut-off, the right side Mos of BCQ2 is also switched off, and the left side Mos of BCQ2 is still conducting state, and the second voltage-stabiliser tube BCZD2 is cut again
In circuit, therefore, if wanting to allow triode BCQ1 to turn on again, it is steady that supply voltage must reach the first voltage-stabiliser tube BCZD1 and second
The sum of threshold voltage of pressure pipe BCZD2 (i.e. the first clamp voltage 10.1V), and supply voltage is 6.8V at this time, it is impossible to it is mutated
To 10.1V, therefore, the stagnant ring of shut-off of 3.3V is obtained, controller BCU1 can stablize shut-off, effectively prevent controller BC
U1 occurs to restart back and forth when its threshold range is shaken.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims scope is done, should all belong to the utility model claims covers model
Enclose.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of protection not exported altogether and Hysteresis control circuit, applied to power supply, it is characterised in that including first switch and
Controller, further includes：
Overvoltage/current foldback circuit, is connected with the first switch, in power supply overvoltage/overcurrent according to the enabled control received
Signal control controller processed is closed；
Stagnant loop circuit, is connected with the first switch and the overvoltage/current foldback circuit, for the controller open or
Increase the voltage hysteresis being switched on or off of the controller during shut-off, stablize the controller and open or stablize shut-off；
The first switch is connected with the feeder ear of power supply and the controller respectively, is exported according to the feeder ear of the power supply
Supply voltage on or off.
2. the protection according to claim 1 not exported altogether and Hysteresis control circuit, it is characterised in that further include difference
The first pressure sampling circuit being connected with the feeder ear of the first switch and power supply, for carrying out partial pressure to the supply voltage
Sampling the first sampled voltage of output；
First sampled voltage is used to control the first switch on or off.
3. the protection according to claim 2 not exported altogether and Hysteresis control circuit, it is characterised in that described first opens
Close includes the first divider resistance and the second divider resistance for triode, first pressure sampling circuit；
First divider resistance and the second divider resistance are sequentially connected in series feeder ear and the first switch in the power supply
Between base stage；The emitter of the first switch is connected with the feeder ear of the power supply, the collector of the first switch and institute
State the enabled pin connection of controller.
4. the protection according to claim 3 not exported altogether and Hysteresis control circuit, it is characterised in that the stagnant ring electricity
Road includes the clamp circuit and second switch being connected with first pressure sampling circuit, and the clamp circuit is equipped with the first clamper
Voltage and the second clamp voltage；
The second switch is connected with the first switch, the overvoltage/current foldback circuit and the clamp circuit respectively,
And turned on when the supply voltage reaches first clamp voltage based on first sampled voltage so that the controller
Stablize and open；Or when the supply voltage reaches second clamp voltage based on first sampled voltage turn off so that
The controller stablizes shut-off.
5. the protection according to claim 4 not exported altogether and Hysteresis control circuit, it is characterised in that the clamper electricity
Road includes the first voltage-stabiliser tube and the second voltage-stabiliser tube, and the second switch is metal-oxide-semiconductor；
The anode of first voltage-stabiliser tube is connected with first pressure sampling circuit, the cathode of first voltage-stabiliser tube with it is described
The anode connection of second voltage-stabiliser tube, the cathode of second voltage-stabiliser tube are connected with the source electrode of the second switch, and described second opens
The source electrode of pass is additionally coupled to the overvoltage/current foldback circuit, the drain electrode of the second switch and first voltage-stabiliser tube and the
The connecting node connection of two voltage-stabiliser tubes, the grid of the second switch are connected with the collector of the first switch.
6. the protection according to claim 5 not exported altogether and Hysteresis control circuit, it is characterised in that the overvoltage/
Current foldback circuit includes current-limiting resistance and the 3rd switch；3rd switch is metal-oxide-semiconductor；
The first end of the current-limiting resistance is connected with providing the input terminal of voltage for the overvoltage/mistake note protection circuit, the limit
The second end of leakage resistance is connected with the grid of the described 3rd switch, and the grid of the 3rd switch is also with providing the enabled control
The detection circuit connection of signal, the drain electrode of the 3rd switch are connected with the source electrode of the second switch, and the 3rd switch
Drain electrode be also connected with first pressure sampling circuit, it is described 3rd switch source electrode ground connection；
Or the drain electrode of the 3rd switch is also connected by the clamp circuit with first pressure sampling circuit.
7. the protection according to claim 6 not exported altogether and Hysteresis control circuit, it is characterised in that described second opens
Close and the described 3rd switch is an integrated metal-oxide-semiconductor.
8. the protection according to claim 3 not exported altogether and Hysteresis control circuit, it is characterised in that further include second
Pressure sampling circuit, second pressure sampling circuit be connected to the enabled pin of the controller and the first switch it
Between, for partial pressure sampling the second sampled voltage of generation to be carried out to the supply voltage when the first switch is turned on to control
State controller unlatching.
9. the protection according to claim 8 not exported altogether and Hysteresis control circuit, it is characterised in that described second point
Pressure sample circuit includes the 4th divider resistance and the 8th divider resistance；
The first end of 4th divider resistance is connected with the collector of the first switch, and the second of the 4th divider resistance
End connects reference ground by the 8th divider resistance；Node between 4th divider resistance and the 8th divider resistance is also
It is connected to the enabled pin of controller；
Node voltage between 4th divider resistance and the 8th divider resistance is second sampled voltage.
10. the protection according to claim 1 not exported altogether and Hysteresis control circuit, it is characterised in that the company of further including
The soft starting circuit being connected between the soft start pin of the controller and reference ground, the soft starting circuit include soft start electricity
Hold and soft start resistance；
The first end of the soft start capacitor is connected with the soft start pin, the second termination reference of the soft start capacitor
Ground, the soft start resistance are in parallel with the soft start capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721268968.8U CN207321095U (en) | 2017-09-29 | 2017-09-29 | A kind of protection not exported altogether and Hysteresis control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721268968.8U CN207321095U (en) | 2017-09-29 | 2017-09-29 | A kind of protection not exported altogether and Hysteresis control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207321095U true CN207321095U (en) | 2018-05-04 |
Family
ID=62428288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721268968.8U Active CN207321095U (en) | 2017-09-29 | 2017-09-29 | A kind of protection not exported altogether and Hysteresis control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN207321095U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN113507772A (en) * | 2021-08-16 | 2021-10-15 | 欧普照明股份有限公司 | Hysteresis circuit, emergency lighting circuit and lighting equipment |
-
2017
- 2017-09-29 CN CN201721268968.8U patent/CN207321095U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109067158A (en) * | 2018-08-21 | 2018-12-21 | 北方电子研究院安徽有限公司 | A kind of elimination DC power supply starting overshoot protection circuit |
| CN109067158B (en) * | 2018-08-21 | 2024-01-26 | 北方电子研究院安徽有限公司 | Protection circuit for eliminating starting overshoot of direct-current power supply |
| CN113507772A (en) * | 2021-08-16 | 2021-10-15 | 欧普照明股份有限公司 | Hysteresis circuit, emergency lighting circuit and lighting equipment |
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