CN208158102U - Switching Power Supply and its switching tube protection circuit - Google Patents
Switching Power Supply and its switching tube protection circuit Download PDFInfo
- Publication number
- CN208158102U CN208158102U CN201820838986.3U CN201820838986U CN208158102U CN 208158102 U CN208158102 U CN 208158102U CN 201820838986 U CN201820838986 U CN 201820838986U CN 208158102 U CN208158102 U CN 208158102U
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- busbar voltage
- power supply
- switching tube
- divider resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a kind of Switching Power Supply and its switching tube protection circuit, the switch protecting circuit includes：Detection module exports first control signal when busbar voltage is greater than setting busbar voltage threshold value for the busbar voltage of detection switch power supply；When busbar voltage is equal to or less than setting busbar voltage threshold value, second control signal is exported；Control module is connect with detection module, is used for the output of on-off switching tube upon receiving the first control signal；When receiving second control signal, the output of switching tube is kept.The circuit can be when over-voltage occurs for Switching Power Supply, turn off the switching tube in Switching Power Supply, it effectively reduces by busbar voltage fluctuation and the influence for powering on surge voltage to Switching Power Supply, and then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved, and cost is relatively low.
Description
Technical field
The utility model relates to Analogous Integrated Electronic Circuits technical field, in particular to the switch protection of pipe electricity of a kind of Switching Power Supply
Road and a kind of Switching Power Supply.
Background technique
Switching Power Supply is widely used in all kinds of consumption electronic products since size is small, high-efficient, must not as power supply class
The a part that can lack, Switching Power Supply are opened using switching tube and turn off the energy storage with inductance, control duty ratio to adjust voltage
Output, is divided into voltage-dropping type and step-up switching power supply, when Switching Power Supply works, the voltage VDS on switching tube be busbar voltage with
The sum of output reflection voltage and leakage inductance bring voltage.
Currently, being influenced since all kinds of voltage ripple of power network are different and power on surge voltage, the switching tube quilt of Switching Power Supply
The example burnt out is commonplace.To solve this problem, in the related technology, the switching tube of high voltage, but which is usually used
The cost of Switching Power Supply can be greatly increased.
Utility model content
The utility model is intended to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, this reality
It is to propose that a kind of switching tube protection circuit of Switching Power Supply, the circuit can occur in Switching Power Supply with a novel purpose
When over-voltage, the switching tube in Switching Power Supply is turned off, effectively reduces by busbar voltage fluctuation and powers on surge voltage to switch
The influence of power supply, and then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved,
And cost is relatively low.
Another purpose of the utility model is to propose a kind of Switching Power Supply.
In order to achieve the above objectives, on the one hand the utility model proposes the switching tube protection circuit of a kind of Switching Power Supply, wraps
It includes：Detection module and the control module being connect with the detection module；The detection module, for detecting the Switching Power Supply
Busbar voltage exports first control signal when the busbar voltage is greater than setting busbar voltage threshold value；When the busbar voltage
When equal to or less than the setting busbar voltage threshold value, second control signal is exported；The control module is received for working as
When the first control signal, the output of the switching tube is turned off；When receiving the second control signal, opened described in holding
Close the output of pipe.
The switching tube protection circuit of Switching Power Supply according to the present utility model, the bus electricity of detection module detection switch power supply
Pressure exports first control signal when busbar voltage is greater than setting busbar voltage threshold value, sets when busbar voltage is equal to or less than
When determining busbar voltage threshold value, export second control signal, control module when receiving first control signal, on-off switching tube
Output, when receiving second control signal, keeps the output of switching tube.The circuit can occur in Switching Power Supply as a result,
When pressure, the switching tube in Switching Power Supply is turned off, effectively reduces by busbar voltage fluctuation and to power on surge voltage split powered-down
The influence in source, and then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved, and
Cost is relatively low.
In addition, can also be had according to the switching tube protection circuit of the utility model Switching Power Supply set forth above following attached
The technical characteristic added：
Specifically, the detection module includes：Divide sampling unit and with the partial pressure sampling unit connect compared with it is single
Member, the comparing unit are connect with the control module；Sampling unit is divided, for the bus electricity to the Switching Power Supply
Pressure is divided, and samples the busbar voltage after partial pressure；Comparing unit, for by the busbar voltage after the partial pressure
It is compared with setting busbar voltage partial pressure threshold value, if the busbar voltage after the partial pressure is greater than the setting busbar voltage
Divide threshold value, it is determined that the busbar voltage is greater than the setting busbar voltage threshold value, exports the first control signal；If institute
Busbar voltage after stating partial pressure is equal to or less than the setting busbar voltage and divides threshold value, it is determined that the busbar voltage is equal to
Or it is less than the setting busbar voltage threshold value, export the second control signal.
Specifically, the control module includes：Control unit and the driving unit being connect with described control unit, the control
Unit processed is connect with the detection module；Described control unit, for exporting first when receiving the first control signal
Driving control signal；When receiving the second control signal, the second driving control signal is exported；The driving unit is used
In when receiving first driving control signal, the first driving signal is exported, the output of the switching tube is turned off；Work as reception
When to second driving control signal, the second driving signal is exported, the output of the switching tube is kept.
Further, the partial pressure sampling unit includes：First divider resistance and the second divider resistance；First partial pressure
The first end of resistance is connect with the bus of the Switching Power Supply, the second end of first divider resistance and the second partial pressure electricity
The first end of resistance connects, the second end ground connection of second divider resistance；Described in the first end of second divider resistance is used as
The output plus terminal of sampling unit is divided, the second end of second divider resistance is negative as the output of the partial pressure sampling unit
End.
Specifically, the partial pressure sampling unit further includes：Filter capacitor；The first end of the filter capacitor and described second
The first end of divider resistance connects, and the second end of the filter capacitor is connect with the second end of second divider resistance.
Specifically, the comparing unit is comparator；The of the reference foot of the comparator and second divider resistance
One end connection, output end of the cathode foot of the comparator as the comparing unit, the anode foot ground connection of the comparator.
Specifically, described control unit includes：PNP type triode and NPN type triode；The base of the PNP type triode
Pole is connect with the cathode foot of the comparator, and the built-in power of the emitter of the PNP type triode and the Switching Power Supply connects
It connects, the collector of the PNP type triode is connect with the base stage of the NPN type triode, the emitter of the NPN type triode
Ground connection, output end of the collector of the NPN type triode as described control unit.
Further, described control unit further includes：Third divider resistance, the 4th divider resistance and the 5th divider resistance；
The first end of 4th divider resistance is connect with the built-in power of the Switching Power Supply, the second end of the 4th divider resistance
It is connect with the emitter of the PNP type triode；The transmitting of the first end and the PNP type triode of the third divider resistance
Pole connects, the base stage connection of PNP type triode described in the second end of the third divider resistance；The of 5th divider resistance
One end is connect with the collector of the PNP type triode, second end and the NPN type triode of the 5th divider resistance
Base stage connection.
In order to achieve the above objectives, the utility model second aspect proposes a kind of Switching Power Supply comprising switching tube and sheet
Switching tube protection circuit described in utility model first aspect embodiment, control module and institute in the switching tube protection circuit
State switching tube connection.
Switching Power Supply according to the present utility model can be occurred by above-mentioned switching tube protection circuit in Switching Power Supply
When over-voltage, the switching tube in Switching Power Supply is turned off, effectively reduces by busbar voltage fluctuation and powers on surge voltage to switch
The influence of power supply, and then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved,
And cost is relatively low.
In addition, can also have following additional technical characteristic according to the utility model Switching Power Supply set forth above：
Specifically, above-mentioned Switching Power Supply further includes：Bus；Detection module in the switching tube protection circuit with it is described
Bus connection.
Detailed description of the invention
The utility model is above-mentioned and/or additional aspect and advantage from the following description of the accompanying drawings of embodiments will
Become obvious and be readily appreciated that, wherein
Fig. 1 is the block diagram according to the switching tube protection circuit of the Switching Power Supply of the utility model one embodiment；
Fig. 2 is the box signal according to the switching tube protection circuit of the Switching Power Supply of the utility model another embodiment
Figure；
Fig. 3 is the circuit topology figure according to the switching tube protection circuit of the Switching Power Supply of the utility model one embodiment；
Fig. 4 is the block diagram according to the Switching Power Supply of the utility model one embodiment.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
With reference to the accompanying drawing come describe the utility model embodiment Switching Power Supply switching tube protection circuit and switch electricity
Source.
Fig. 1 is the block diagram according to the switching tube protection circuit of the Switching Power Supply of the utility model one embodiment.
As shown in Figure 1, the protection circuit includes detection module 10 and control module 20.
Detection module 10 is used for the busbar voltage VDC of detection switch power supply, when busbar voltage VDC is greater than setting busbar voltage
When threshold value, first control signal is exported；When busbar voltage VDC is equal to or less than setting busbar voltage threshold value, output second
Control signal.Control module 20 is used for the output of on-off switching tube upon receiving the first control signal；When receiving the second control
When signal processed, the output of switching tube is kept.Wherein, setting busbar voltage threshold value can carry out pre- according to the pressure-resistant parameter of switching tube
If.
Specifically, PWM (Pulse Width Modulation, the pulse of the adjustable driving switch pipe of control module 20
Width modulated) signal pulsewidth or arteries and veins frequency, make Switching Power Supply stablize output.The busbar voltage of 10 detection switch power supply of detection module
VDC, and control signal is generated according to busbar voltage VDC, wherein if busbar voltage VDC is due to power network fluctuation or upper surge
The reasons such as voltage are higher than setting busbar voltage threshold value, then detection module 10 exports first control signal, and control module 20 is receiving
When to first control signal, the pwm signal that the output of on-off switching tube, i.e. shutdown are input to switching tube is carried out with switch tube
Protection, prevents switching tube from damaging due to over-voltage.If busbar voltage VDC is less than or equal to setting busbar voltage threshold value,
Detection module 10 generates the second detection signal, and 20 control module 20 of control module judges mother when receiving second control signal
Line voltage is normal, keeps the output of switching tube, and Switching Power Supply works normally.The circuit can Switching Power Supply occur over-voltage when,
The switching tube in Switching Power Supply is turned off, is effectively reduced by busbar voltage fluctuation and the shadow for powering on surge voltage to Switching Power Supply
Ring, and then reduce Switching Power Supply because of crash rate caused by switching tube over-voltage, improve the reliability of Switching Power Supply, and cost compared with
It is low.
Further, in the embodiments of the present invention, as shown in Fig. 2, detection module 10 may include：Partial pressure sampling
Unit 101 and comparing unit 102.Wherein, comparing unit 102 is connect with partial pressure sampling unit 101, comparing unit 102 and control
Module 20 connects.Partial pressure sampling unit 101 is for dividing the busbar voltage VDC of Switching Power Supply, and after sampling partial pressure
Busbar voltage.Comparing unit, for the busbar voltage after partial pressure to be compared with setting busbar voltage partial pressure threshold value, if partial pressure
Busbar voltage afterwards is greater than setting busbar voltage and divides threshold value, it is determined that busbar voltage is greater than setting busbar voltage threshold value, output
First control signal；If the busbar voltage after partial pressure, which is equal to or less than setting busbar voltage, divides threshold value, it is determined that bus electricity
Pressure is equal to or less than setting busbar voltage threshold value, exports second control signal.Wherein, busbar voltage partial pressure threshold value can basis
The pressure-resistant situation of switching tube is preset.
Specifically, as shown in Fig. 2, partial pressure sampling unit 101 can the busbar voltage VDC to Switching Power Supply divide,
And the busbar voltage after partial pressure is sent into comparing unit 102.Comparing unit 102 is answered according to the busbar voltage output phase after partial pressure
Control signal.Wherein, if the busbar voltage after partial pressure, which is greater than busbar voltage, divides threshold value, illustrate that busbar voltage is likely to occur
Over-voltage, comparing unit 102 export first control signal；If the busbar voltage after partial pressure, which is less than or equal to busbar voltage, divides threshold
Value, illustrates that busbar voltage is normal, and comparing unit 102 exports second control signal.
One embodiment according to the present utility model, as shown in Fig. 2, control module 20 may include：201 He of control unit
Driving unit 202.Wherein, control unit 201 is connected with driving unit 202, and control unit is connect with 201 detection modules 10.Control
Unit 201 processed is for upon receiving the first control signal, exporting the first driving control signal；When receiving second control signal
When, export the second driving control signal.Driving unit 202 is used for when receiving the first driving control signal, and output first is driven
Dynamic signal, the output of on-off switching tube；When receiving the second driving control signal, the second driving signal is exported, keeps switch
The output of pipe.
Specifically, driving unit 201 is to output drive signal (for example, pwm signal) to switching tube, with driving switch pipe
Be turned on/off.As shown in Fig. 2, illustrating that busbar voltage can if the busbar voltage after partial pressure, which is greater than busbar voltage, divides threshold value
Over-voltage can occur, comparing unit 102 exports first control signal to control unit 201, and control unit 201 is in first control signal
Control under export the first driving control signal to driving unit 202, control of the driving unit 202 in the first driving control signal
The first driving signal of lower output is to switching tube, and switching tube turns off under the control of the first driving signal, to avoid excessive pressure damages.Such as
Busbar voltage after fruit partial pressure is less than or equal to busbar voltage and divides threshold value, illustrates that busbar voltage is normal, comparing unit 102 exports
For second control signal to control unit 201, control unit 201 exports the second drive control letter under the control of second control signal
Number to driving unit 202, driving unit 202 exports the second driving signal to switching under the control of the second driving control signal
Pipe, switching tube keep output under the control of the second driving signal, and Switching Power Supply works normally.It is reduced as a result, by bus electricity
Pressure fluctuation and influence of the surge voltage to Switching Power Supply is powered on, and then reduces Switching Power Supply because of failure caused by switching tube over-voltage
Rate improves the reliability of Switching Power Supply, and cost is relatively low.
The physical circuit topological diagram of switching tube protection circuit is described below with reference to specifically example.
One embodiment according to the present utility model, as shown in figure 3, partial pressure sampling unit 101 may include：First partial pressure
Resistance R1 and the second divider resistance R2.Wherein, the bus connection of the first end and Switching Power Supply of the first divider resistance R1, first point
The second end of piezoresistance R1 is connect with the first end of the second divider resistance R2, the second end ground connection of the second divider resistance R2.Second
Output plus terminal of the first end of divider resistance R2 as partial pressure sampling unit 101, the second end of the second divider resistance R2, which is used as, divides
Press the output negative terminal of sampling unit 101.
Further, as shown in figure 3, partial pressure sampling unit 101 can also include：Filter capacitor C1.Filter capacitor C1's
First end is connect with the first end of the second divider resistance R2, the second end of the second end of filter capacitor C1 and the second divider resistance R2
Connection.
Specifically, partial pressure sampling unit 101 can divide busbar voltage, and the busbar voltage after partial pressure is passed through
Output plus terminal is sent into comparing unit 102.Filter capacitor C1 can be filtered the busbar voltage after partial pressure.Partial pressure sampling
Unit 101 export partial pressure after busbar voltage beTherefore, if busbar voltage fluctuation, partial pressure sampling is single
Busbar voltage after the partial pressure of 101 output of member can also fluctuate therewith.
One embodiment according to the present utility model, as shown in figure 3, comparing unit 102 is comparator；The reference of comparator
Foot is connect with the first end of the second divider resistance R2, output end of the cathode foot of comparator as comparing unit 102, comparator
Anode foot ground connection.
Specifically, comparator can be chip TL431, and internal reference voltage Vref can be set as 2.5V, work as comparator
Reference foot voltage be greater than internal reference voltage Vref when, the anode foot of comparator is connected with cathode foot.When the ginseng of comparator
When examining the voltage of foot less than internal reference voltage Vref, comparator shutdown.
One embodiment according to the present utility model, as shown in figure 3, control unit 201 may include：PNP type triode
Q1 and NPN type triode Q2.The base stage of PNP type triode Q1 and the cathode foot of comparator connect, the transmitting of PNP type triode Q1
The built-in power VDD connection of pole and Switching Power Supply, the collector of PNP type triode Q1 are connect with the base stage of NPN type triode Q2,
The emitter of NPN type triode Q2 is grounded, output end of the collector of NPN type triode Q2 as control unit 201.
Further, as shown in figure 3, control unit 201 can also include：Third divider resistance R3, the 4th divider resistance
R4 and the 5th divider resistance R5.Wherein, the built-in power VDD connection of the first end and Switching Power Supply of the 4th divider resistance R4, the
The second end of four divider resistance R4 is connect with the emitter of PNP type triode Q1；The first end and positive-negative-positive of third divider resistance R3
The emitter of triode Q1 connects, the base stage connection of the second end PNP type triode Q1 of third divider resistance R3；5th partial pressure electricity
The first end of resistance R5 is connect with the collector of PNP type triode Q1, the second end and NPN type triode Q2 of the 5th divider resistance R5
Base stage connection.
Specifically, as shown in figure 3, partial pressure sampling unit 101 can divide busbar voltage, and will be after partial pressure
Busbar voltage is sent into the reference foot of comparator through output plus terminal.If the busbar voltage after partial pressure is greater than the internal reference of comparator
Voltage Vref, then the anode foot of comparator is connected with cathode foot, and then the emitter of Q1 and base stage generate the pressure drop of 0.7V, and Q1 is led
Logical, the collector of Q1 is connected by R5 driving triode Q2, and after Q2 conducting, driving unit 202 stops output pwm signal and extremely switchs
Pipe, at this point, the voltage of switching tube will not be superimposed output reflection voltage and leakage inductance bring voltage.And if pressure after busbar voltage
Less than the internal reference voltage Vref of comparator, then comparator ends, and Q1, Q2 cut-off, driving unit 202 keep the defeated of switching tube
Out, Switching Power Supply works normally.It is reduced as a result, by busbar voltage fluctuation and the influence for powering on surge voltage to Switching Power Supply,
And then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved, and cost is relatively low.
In conclusion the switching tube protection circuit of Switching Power Supply according to the present utility model, detection module detection switch electricity
The busbar voltage in source exports first control signal, when busbar voltage is equal to when busbar voltage is greater than setting busbar voltage threshold value
Or when being less than setting busbar voltage threshold value, second control signal is exported, control module is closed when receiving first control signal
The output of disconnected switching tube keeps the output of switching tube when receiving second control signal.The circuit can switch as a result,
When over-voltage occurs for power supply, the switching tube in Switching Power Supply is turned off, is effectively reduced by busbar voltage fluctuation and upper surge electricity
Influence to Switching Power Supply is pressed, and then reduces Switching Power Supply because of crash rate caused by switching tube over-voltage, improves Switching Power Supply
Reliability, and cost is relatively low.
In addition, as shown in figure 4, the utility model also proposes a kind of Switching Power Supply 100 comprising switching tube 101 and above-mentioned
Switching tube protection circuit 102, the control module 20 in switching tube protection circuit 102 connect with switching tube 101.Switching Power Supply
100 further include：Bus L；Detection module 10 in switching tube protection circuit 102 is connect with bus L.
Switching Power Supply according to the present utility model can be occurred by above-mentioned switching tube protection circuit in Switching Power Supply
When over-voltage, the switching tube in Switching Power Supply is turned off, effectively reduces by busbar voltage fluctuation and powers on surge voltage to switch
The influence of power supply, and then Switching Power Supply is reduced because of crash rate caused by switching tube over-voltage, the reliability of Switching Power Supply is improved,
And cost is relatively low.
In the description of the present invention, it should be understood that term " first ", " second " are used for description purposes only, and
It cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include one or more of the features.In the utility model
In description, the meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature is in the second feature " on " or " down "
It can be that the first and second features directly contact or the first and second features are by intermediary mediate contact.Moreover, first is special
Sign can be fisrt feature above the second feature " above ", " above " and " above " and be directly above or diagonally above the second feature, or only
Indicate that first feature horizontal height is higher than second feature.Fisrt feature under the second feature " below ", " below " and " below " can be with
It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combination and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (10)
1. a kind of switching tube protection circuit of Switching Power Supply, which is characterized in that including：Detection module and with the detection module connect
The control module connect；
The detection module, for detecting the busbar voltage of the Switching Power Supply, when the busbar voltage is greater than setting bus electricity
When pressing threshold value, first control signal is exported；It is defeated when the busbar voltage is equal to or less than the setting busbar voltage threshold value
Second control signal out；
The control module, for when receiving the first control signal, turning off the output of the switching tube；When receiving
When the second control signal, the output of the switching tube is kept.
2. switching tube protection circuit according to claim 1, which is characterized in that the detection module includes：Partial pressure sampling
Unit and the comparing unit connecting with the partial pressure sampling unit, the comparing unit are connect with the control module；
Sampling unit is divided, is divided for the busbar voltage to the Switching Power Supply, and is sampled described after partial pressure
Busbar voltage；
Comparing unit, for the busbar voltage after the partial pressure to be compared with setting busbar voltage partial pressure threshold value, if
The busbar voltage after the partial pressure is greater than the setting busbar voltage and divides threshold value, it is determined that the busbar voltage is greater than institute
Setting busbar voltage threshold value is stated, the first control signal is exported；If the busbar voltage after the partial pressure is equal to or less than institute
State setting busbar voltage partial pressure threshold value, it is determined that the busbar voltage is equal to or less than the setting busbar voltage threshold value, defeated
The second control signal out.
3. switching tube protection circuit according to claim 2, which is characterized in that the control module includes：Control unit
The driving unit connecting with described control unit, described control unit are connect with the detection module；
Described control unit, for exporting the first driving control signal when receiving the first control signal；When receiving
When the second control signal, the second driving control signal is exported；
The driving unit exports the first driving signal for when receiving first driving control signal, described in shutdown
The output of switching tube；When receiving second driving control signal, the second driving signal is exported, the switching tube is kept
Output.
4. switching tube protection circuit according to claim 3, which is characterized in that the partial pressure sampling unit includes：First
Divider resistance and the second divider resistance；
The first end of first divider resistance is connect with the bus of the Switching Power Supply, the second end of first divider resistance
It is connect with the first end of second divider resistance, the second end ground connection of second divider resistance；
Output plus terminal of the first end of second divider resistance as the partial pressure sampling unit, second divider resistance
Output negative terminal of the second end as the partial pressure sampling unit.
5. switching tube protection circuit according to claim 4, which is characterized in that the partial pressure sampling unit further includes：Filter
Wave capacitor；
The first end of the filter capacitor is connect with the first end of second divider resistance, the second end of the filter capacitor with
The second end of second divider resistance connects.
6. switching tube protection circuit according to claim 4, which is characterized in that the comparing unit is comparator；
The reference foot of the comparator is connect with the first end of second divider resistance, and the cathode foot of the comparator is as institute
State the output end of comparing unit, the anode foot ground connection of the comparator.
7. switching tube protection circuit according to claim 6, which is characterized in that described control unit includes：Three pole of positive-negative-positive
Pipe and NPN type triode；
The base stage of the PNP type triode is connect with the cathode foot of the comparator, the emitter of the PNP type triode and institute
The built-in power connection of Switching Power Supply is stated, the collector of the PNP type triode is connect with the base stage of the NPN type triode,
The emitter of the NPN type triode is grounded, output end of the collector of the NPN type triode as described control unit.
8. switching tube protection circuit according to claim 7, which is characterized in that described control unit further includes：Third point
Piezoresistance, the 4th divider resistance and the 5th divider resistance；
The first end of 4th divider resistance is connect with the built-in power of the Switching Power Supply, and the of the 4th divider resistance
Two ends are connect with the emitter of the PNP type triode；
The first end of the third divider resistance is connect with the emitter of the PNP type triode, the third divider resistance
The base stage of PNP type triode described in second end connects；
The first end of 5th divider resistance is connect with the collector of the PNP type triode, the 5th divider resistance
Second end is connect with the base stage of the NPN type triode.
9. a kind of Switching Power Supply, which is characterized in that including switching tube and such as the described in any item switch protection of pipes of claim 1-8
Circuit；
Control module in the switching tube protection circuit is connect with the switching tube.
10. Switching Power Supply according to claim 9, which is characterized in that further include：Bus；
Detection module in the switching tube protection circuit is connect with the bus.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838986.3U CN208158102U (en) | 2018-05-30 | 2018-05-30 | Switching Power Supply and its switching tube protection circuit |
| PCT/CN2019/083194 WO2019228093A1 (en) | 2018-05-30 | 2019-04-18 | Switch power supply and switch tube protection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820838986.3U CN208158102U (en) | 2018-05-30 | 2018-05-30 | Switching Power Supply and its switching tube protection circuit |
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| CN208158102U true CN208158102U (en) | 2018-11-27 |
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| CN201820838986.3U Active CN208158102U (en) | 2018-05-30 | 2018-05-30 | Switching Power Supply and its switching tube protection circuit |
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| WO (1) | WO2019228093A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350902A (en) * | 2019-07-18 | 2019-10-18 | 合肥惠科金扬科技有限公司 | A kind of Anti-misoperation circuit and anti-misoperation apparatus |
| WO2019228093A1 (en) * | 2018-05-30 | 2019-12-05 | 广东美芝制冷设备有限公司 | Switch power supply and switch tube protection circuit thereof |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN114070132A (en) * | 2021-11-29 | 2022-02-18 | 上海尚实能源科技有限公司 | Motor control circuit and motor control system of auxiliary power device |
| CN114096050A (en) * | 2021-10-13 | 2022-02-25 | 深圳市奥金瑞科技有限公司 | Novel lighting switch system based on Bluetooth wireless ad hoc network technology |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035169B (en) * | 2009-09-28 | 2015-05-20 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| CN104158147A (en) * | 2013-05-14 | 2014-11-19 | 海洋王（东莞）照明科技有限公司 | Overvoltage protection circuit and electronic equipment |
| CN206323126U (en) * | 2016-12-28 | 2017-07-11 | 广州视源电子科技股份有限公司 | AC overvoltage protection circuit with self-reset function |
| CN107069655B (en) * | 2017-06-06 | 2020-11-27 | 吉林省中赢高科技有限公司 | Voltage protection circuit |
| CN208158102U (en) * | 2018-05-30 | 2018-11-27 | 广东美芝制冷设备有限公司 | Switching Power Supply and its switching tube protection circuit |
-
2018
- 2018-05-30 CN CN201820838986.3U patent/CN208158102U/en active Active
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2019
- 2019-04-18 WO PCT/CN2019/083194 patent/WO2019228093A1/en active Application Filing
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019228093A1 (en) * | 2018-05-30 | 2019-12-05 | 广东美芝制冷设备有限公司 | Switch power supply and switch tube protection circuit thereof |
| CN110350902A (en) * | 2019-07-18 | 2019-10-18 | 合肥惠科金扬科技有限公司 | A kind of Anti-misoperation circuit and anti-misoperation apparatus |
| CN110350902B (en) * | 2019-07-18 | 2023-01-17 | 重庆惠科金扬科技有限公司 | Anti-misoperation circuit and anti-misoperation device |
| CN112448370A (en) * | 2019-09-04 | 2021-03-05 | 厦门市必易微电子技术有限公司 | Primary side control circuit and control method and isolated power supply conversion circuit |
| CN114096050A (en) * | 2021-10-13 | 2022-02-25 | 深圳市奥金瑞科技有限公司 | Novel lighting switch system based on Bluetooth wireless ad hoc network technology |
| CN114070132A (en) * | 2021-11-29 | 2022-02-18 | 上海尚实能源科技有限公司 | Motor control circuit and motor control system of auxiliary power device |
| CN114070132B (en) * | 2021-11-29 | 2022-11-22 | 上海尚实航空发动机股份有限公司 | Motor control circuit and motor control system of auxiliary power device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019228093A1 (en) | 2019-12-05 |
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