CN206673569U - The output protection circuit of Switching Power Supply - Google Patents
The output protection circuit of Switching Power Supply Download PDFInfo
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- CN206673569U CN206673569U CN201720090605.3U CN201720090605U CN206673569U CN 206673569 U CN206673569 U CN 206673569U CN 201720090605 U CN201720090605 U CN 201720090605U CN 206673569 U CN206673569 U CN 206673569U
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Abstract
A kind of protection circuit of Switching Power Supply; including high frequency transformer, auxiliary power unit; voltage regulation unit and switch element; it is characterized in that; the energy of the high frequency transformer of power supply unit coupled switch power supply described in when Switching Power Supply works exports a DC voltage after its internal rectifying and wave-filtering; the voltage, which is transported to after voltage regulation unit voltage stabilizing on switch element, to be used to provide auxiliary power supply to switch element, makes switching means conductive, the output charging of Switching Power Supply bio-occlusion；When Switching Power Supply does not work; power supply unit does not work; there is no sufficiently high driving voltage to be applied on switch element, make switch element synchronization reliable turn-off, protection switch power supply is not damaged by the negative voltage that may be present caused by output end super capacitor error-polarity connection or other forms.
Description
Technical field
A kind of protection circuit of Switching Power Supply is the utility model is related to, it is more particularly to a kind of to be applied to be super capacitor monomer
The output protection circuit of the Switching Power Supply of charging.
Background technology
Common super capacitor has big charging and discharging currents, efficiency high, environmental pollution is small, has extended cycle life, using temperature
Spend the features such as scope is wide, safe and be used widely, such as in the energy-storage system of new-energy automobile or track train,
It is used for driving high current, the load of short time work after storage energy；However, due to technological reason, the specified electricity of super capacitor
Pressure is typically than relatively low, and the rated operational voltage of monomer super capacitor is typically in 2.8V or so, so in most cases needing to go here and there
Connection uses；Again because each monomer capacity of series loop is it is difficult to ensure that 100% is identical, it is also difficult to ensure each monomer electric leakage also phase
Together, use or place between monomer and monomer after a period of time in super capacitor group and certain voltage difference can be present,
Here it is the unbalanced problem of voltage, therefore, generally needs to place to each monomer in capacitance group in super capacitor group
One balance module, the balance module are generally DC/DC power inverters, can be the monomer that voltage is relatively low in super capacitor group
Carrying out low current (such as 10A) charging, (low current here is the super electricity for the charging current of super capacitor group
The charging current scope of appearance group is usually 500A or even higher), the monomer voltage is risen to certain voltage value to keep and surpass
Other monomers voltage relative equilibrium in level capacitance group.However, in heavy-current discharge, because the capacitance of each monomer is in the presence of poor
It is different, in super capacitor group discharge process, the small monomer of capacitance inside super capacitor group, it is possible to can because overdischarge and
There is negative pressure, the negative pressure is applied to the output end of the DC/DC power inverters as balance module simultaneously；Due to as equilibrium model
The output end of the DC/DC power inverters of block is a rectification circuit, it can be common that diode rectification is carried out using metal-oxide-semiconductor
Synchronous rectification, above-mentioned negative pressure can turn on the body diode of commutation diode or metal-oxide-semiconductor after reaching certain value, if this is negative
If the magnitude of voltage of pressure is larger, corresponding electric current is with regard to big, it is possible to can burn out the DC/DC power inverters as balance module
Output end, severe patient will cause fire incident, result even in the security incident for making new energy train cause car crash.
In view of the above-mentioned problems, one of them existing solution method is in the output end and super capacitor group of balance module
One fuse of series connection between corresponding monomer, this scheme is in the case where there is above-mentioned negative pressure, after electric current exceedes certain value
Fusing, power circuit is disconnected, effectively switch power module can be protected, but it is exactly to insure that the program, which has individual defect,
Silk is unable to self- recoverage, it is necessary to which the fuse that changes the outfit again can just make balance module to monomer up by being fused after rated current
Equilibrium, waste manpower, time and Material Cost and go to safeguard.
Wherein another method is to use relay as anti-reverse protection device, if however, Switching Power Supply is exported to super
When the electric current of level electric capacity charging is larger, then need use the larger relay of volume as anti-reverse protection device, corresponding cost with
Small product size can increase.
Also a kind of existing Switching Power Supply output protection circuit, see Fig. 1, including drive circuit, detection circuit and counnter attack
Meet metal-oxide-semiconductor TR1.In order to prevent the negative pressure that the super capacitor monomer Cn reversal connections of output end are brought (with the negative of super capacitor monomer Cn
Hold and be less than 0V for voltage reference points, super capacitor monomer Cn positive terminal voltage) it is applied to the output end of Switching Power Supply and burns out out
Powered-down source, solution are to be connected to super capacitor monomer in one anti-reverse metal-oxide-semiconductor TR1 of output termination of switch power module
Negative terminal and switch power module output-Vo ends between, detect electric circuit inspection switched power output battery (i.e. super electricity
Hold monomer) polarity of voltage, if without reversal connection (i.e. using super capacitor monomer Cn negative terminal as voltage reference points, super capacitor monomer
Cn positive terminal voltage is more than 0V) drive circuit is then enabled, give anti-reverse metal-oxide-semiconductor through drive circuit from the output end of Switching Power Supply
Grid provides a voltage and turned it on, if detecting super capacitor monomer Cn reversal connection of the electric circuit inspection to output end (i.e. with super
Electric capacity monomer Cn negative terminal is voltage reference points, and super capacitor monomer Cn positive terminal voltage is less than 0V), then an enabled letter is provided
Number, drive circuit is stopped, anti-reverse metal-oxide-semiconductor TR1 shut-offs, play anti-reverse protective effect.However, practical application
In, when carrying out preventing that negative pressure or protection to error-polarity connection from occurring in super capacitor monomer Cn using the protection circuit, due to being supplied to
The switch power source output voltage of super capacitor monomer charging is up to 3V, in the non-poles of super capacitor monomer Cn between 0~2.7V
Property reversal connection or when not occurring negative pressure, Switching Power Supply normal work, the voltage of its output plus terminal+Vo outputs is up to 3V, and one
As metal-oxide-semiconductor cut-in voltage VGS(th)Between 2.5V~4V, even if therefore ignoring the partial pressure of drive circuit, 3V output voltage
It is applied on the gate-to-source of metal-oxide-semiconductor, metal-oxide-semiconductor does not turn on or conducting state is on the larger level of resistance simultaneously, without
Saturation conduction state can be entered.Therefore cause that Switching Power Supply is unable to bio-occlusion super capacitor monomer charging or charge loss is big
Situation, although still possessing counnter attack connection function, the charge function of Switching Power Supply efficient can not be realized.
Utility model content
In view of this, the utility model will solve cost height in output reverse connection prevention protection circuit of the prior art, volume
Greatly, anti-reverse switching tube can not turn on or the problem of conducting resistance is big because of driving voltage deficiency, propose a kind of Switching Power Supply
Output protection circuit, can be when Switching Power Supply works, the protection circuit synchronization low consumption is open-minded, and switch power module is normally
The charging of super capacitor monomer carry out it is balanced, when Switching Power Supply does not work, the protection circuit can synchronous reliable turn-off, prevent out
Problem is damaged caused by negative pressure existing for the output end in powered-down source or reversal connection situation.
To achieve these goals, the technical solution of the utility model is as follows：
A kind of protection circuit of Switching Power Supply, including high frequency transformer, auxiliary power unit, voltage regulation unit and switch are single
Member, the energy of the high frequency transformer of the auxiliary power unit coupled switch power supply described in when Switching Power Supply works is through whole inside it
A DC voltage is exported after stream filtering, the voltage is transported on switch element after voltage regulation unit voltage stabilizing for single to switch
Member provides auxiliary power supply, makes switching means conductive, the output charging of Switching Power Supply bio-occlusion；When Switching Power Supply does not work, auxiliary
Power supply unit does not work, and is applied to without sufficiently high driving voltage on switch element, makes switch element synchronization reliable turn-off, protects
Protect Switching Power Supply not by the negative voltage that may be present caused by output end super capacitor error-polarity connection or other forms and
Damage；
Described high frequency transformer includes primary side winding, vice-side winding and including the tertiary winding, it is preferred that high frequency transformation
Primary side winding and the master power switch series connection of device, vice-side winding and the series connection of secondary rectifier switch, the tertiary winding are used as auxiliary power supply
The tertiary winding of unit；
Described auxiliary power unit includes the tertiary winding, the first diode and the first electric capacity composition；The wherein tertiary winding
Same Name of Ends connect the first diode anode, the negative electrode of the first diode be connected with one end of the first electric capacity and be designated as aid in confession
The output terminals A of electric unit, the different name end of the tertiary winding are connected with the other end of the first electric capacity and are connected and are designated as auxiliary power supply list
The output reference point B of member；
Described voltage regulation unit includes first resistor, second resistance, the second electric capacity, the first voltage-regulator diode, the first NPN tri-
Pole pipe；One end of wherein first, second resistance is connected and is connected to the output terminals A of auxiliary power unit, the first NPN triode
Colelctor electrode connects the other end of first resistor, the other end of the first NPN transistor base connection second resistance and the first voltage stabilizing two
The negative electrode of pole pipe, the first NPN triode emitter stage are connected to one end of the second electric capacity and are designated as the output end of voltage regulation unit,
The other end of second electric capacity is connected with the anode of the first voltage-regulator diode and is connected to the output reference point B of auxiliary power unit；
Described switch element includes 3rd resistor and the first metal-oxide-semiconductor and port D；Wherein 3rd resistor is connected to first
Between the grid of metal-oxide-semiconductor and drain electrode, the grid of the first metal-oxide-semiconductor is connected to the output end C of voltage regulation unit, the source electrode of the first metal-oxide-semiconductor
It is connected to the output reference point B of auxiliary power unit, drain electrode and the connectivity port D of the first metal-oxide-semiconductor.
Preferably, metal-oxide-semiconductor TR1 is the enhanced metal-oxide-semiconductor of N-channel.
The utility model also provides a kind of output protection circuit of Switching Power Supply, for being arranged on Switching Power Supply and super electricity
Between holding monomer, including auxiliary power unit, voltage regulation unit and switch element, switch element include metal-oxide-semiconductor TR1, and auxiliary supplies
Electric unit includes the winding N3 coupled with the power transformer of Switching Power Supply；When Switching Power Supply works, auxiliary power unit
The energy of the power transformer of winding N3 coupled switch power supplys is simultaneously exported to voltage regulation unit, is transported to after voltage regulation unit voltage stabilizing
Switch element, to improve the voltage of switch element by auxiliary power unit to the saturation conduction requirement for meeting metal-oxide-semiconductor TR1,
Ensure that switch element is operated in the working condition of low on-resistance；When Switching Power Supply does not work, auxiliary power unit does not work,
Make switch element synchronization reliable turn-off.
Preferably, described auxiliary power unit, diode D1 and electric capacity C1, winding N3 Same Name of Ends connection two are included
Pole pipe D1 anode, diode D1 negative electrode are connected with electric capacity C1 one end and are used as the output plus terminal of auxiliary power unit, around
Group N3 different name end is connected with the electric capacity C1 other end and is connected secondary ground terminal jointly.
Preferably, described voltage regulation unit, including resistance R1, resistance R2, electric capacity C2, the pole of voltage-regulator diode Z1 and NPN tri-
Pipe Q1；Wherein resistance R1, resistance R2 one end are connected and are connected to the output plus terminal of auxiliary power unit, NPN triode Q1
The colelctor electrode connection resistance R1 other end, the NPN triode Q1 base stage connection resistance R2 other end and voltage-regulator diode Z1 the moon
Pole, NPN triode Q1 emitter stage are connected to electric capacity C2 one end and as the output plus terminal of voltage regulation unit, the electric capacity C2 other ends
It is connected with voltage-regulator diode Z1 anode and is connected secondary ground terminal jointly.
Preferably, described voltage regulation unit, including resistance R1 and voltage-regulator diode Z2, resistance R1 one end connection auxiliary supply
The output plus terminal of electric unit, resistance R1 other end connection voltage-regulator diode Z2 negative electrode and as voltage regulation unit output just
End, voltage-regulator diode Z2 anode connection secondary ground terminal.
Preferably, described switch element, including resistance R3 and metal-oxide-semiconductor TR1, metal-oxide-semiconductor TR1 grid and the one of resistance R3
End is connected and is connected to the output plus terminal of voltage regulation unit, and metal-oxide-semiconductor TR1 source electrode is connected with the resistance R3 other end and is connected jointly
The output negative terminal as switch element is drawn in secondary ground terminal, metal-oxide-semiconductor TR1 drain electrode, for connecting with the negative terminal of super capacitor monomer
Connect.
Compared with prior art, the beneficial effect of the output protection circuit of the utility model Switching Power Supply is：In switch electricity
When source module is in off-mode, by not give switch element provide voltage, shut-off switch, play protection switch power supply not because
Cause to damage to switch power module for backward voltage caused by battery reversal connection or other factors.Worked in Switching Power Supply
When, by providing one after the rectified filtering of a winding coupled transformer energy of the high frequency transformer of Switching Power Supply and voltage stabilizing
Sufficiently high DC voltage, it is applied on the switch metal-oxide-semiconductor grid of switch element, makes its saturation conduction, Switching Power Supply is normal, low
Consumption ground provides power supply for backend load, meets anti-reverse application scenario when output voltage is relatively low, to ensure Switching Power Supply
Output voltage be less than anti-reverse metal-oxide-semiconductor TR1 turn-on threshold voltage Vgsth when output protection circuit remain to normal work.
Brief description of the drawings
Fig. 1 is the output reverse-connection preventing circuit schematic diagram of prior art；
Fig. 2 is the circuit theory diagrams of the output protection circuit of the Switching Power Supply of the utility model embodiment one；
Fig. 3 is that the output protection circuit of the Switching Power Supply of the utility model embodiment one is applied to the system in Switching Power Supply
Circuit theory diagrams；
Fig. 4 is the circuit theory diagrams of the output protection circuit of the Switching Power Supply of the utility model embodiment two.
Embodiment
Embodiment one
Referring to Fig. 2, a kind of output protection circuit of Switching Power Supply, including high frequency transformer T1, auxiliary power unit
201, voltage regulation unit 202 and switch element 203, the coupled switch power supply of auxiliary power unit 201 when Switching Power Supply works
The energy of high frequency transformer exports a DC voltage after its internal rectifying and wave-filtering, and the voltage passes through the voltage stabilizing of voltage regulation unit 202
After be transported on switch element 203 be used for give switch element 203 provide auxiliary power supply, switch element 203 is obtained sufficiently high
Driving voltage make its saturation conduction, so as to ensure that Switching Power Supply is normal, be charged to the super capacitor monomer of output end to low consumption；
When Switching Power Supply does not work, auxiliary power unit 201 is not worked, and switch element is applied to without sufficiently high driving voltage
On 203, make 203 synchronous reliable turn-off of switch element, protection switch power supply not because output end super capacitor error-polarity connection or its
Negative voltage caused by his form and damage.
High frequency transformer T1, the power transformer as in Switching Power Supply, including primary side winding Np, vice-side winding Ns and
Including winding N3, it is preferred that primary side winding Np and the master power switch series connection of transformer, vice-side winding Ns and secondary rectifier switch
Series connection, winding N3 are used as the winding N3 of auxiliary power unit 201.
Auxiliary power unit 201 includes winding N3, diode D1 and electric capacity C1 is formed；Wherein winding N3 is in Switching Power Supply
Power transformer a winding, and the primary side winding of winding N3 and power transformer is normal shock relation；Winding N3's is same
Name end connection diode D1 anode, diode D1 negative electrode are connected with electric capacity C1 one end and are designated as auxiliary power unit 201
Output plus terminal A, winding N3 different name end be connected with the electric capacity C1 other end and be designated as auxiliary power unit 201 output reference
Point B.Export the secondary ground terminal PGND_S of reference point B connection main power circuits.
Voltage regulation unit 202 includes resistance R1, resistance R2, electric capacity C2, voltage-regulator diode Z1 and NPN triode Q1, wherein electricity
Resistance R1, resistance R2 one end are connected and are connected to the output plus terminal A of auxiliary power unit 201, and the colelctor electrode of NPN triode Q1 connects
The connecting resistance R1 other end, the base stage connection resistance R2 other end and voltage-regulator diode Z1 negative electrode of NPN triode Q1, NPN
Triode Q1 emitter stage is connected to electric capacity C2 one end and is designated as the output end C of voltage regulation unit 202, the electric capacity C2 other end with
Voltage-regulator diode Z1 anode is connected and is connected to the output reference point B of auxiliary power unit 201.
Switch element 203 includes resistance R3 and metal-oxide-semiconductor TR1 and port D；Wherein resistance R3 is connected to metal-oxide-semiconductor TR1 grid
Between pole and source electrode, metal-oxide-semiconductor TR1 grid is also connected to the output end C of voltage regulation unit 202, and metal-oxide-semiconductor TR1 source electrode is also connected with
To output the reference point B, metal-oxide-semiconductor TR1 of auxiliary power unit 201 drain electrode connectivity port D.Port D is used for and super capacitor list
The negative terminal connection of body, i.e. the secondary ground terminal PGND_S of main power circuit are connected to super electricity by metal-oxide-semiconductor TR1 source drain
Hold the negative terminal of monomer.
Metal-oxide-semiconductor TR1 is the enhanced metal-oxide-semiconductor of N-channel.
The output protection circuit realization that the present embodiment Switching Power Supply is introduced with reference to Fig. 2 and Fig. 3 is protected to Switching Power Supply
Principle：
The output protection circuit of the Switching Power Supply of the present embodiment can apply to a switch electricity based on anti exciting converter
In source, Fig. 3 is seen, Switching Power Supply includes main power circuit, control circuit and output protection circuit of the present utility model, described
Control circuit has an Enable Pin EN, and when Enable Pin EN is triggered, control circuit does not work, drive signal end DRV output
Pwm signal is all low level, and the main power cell of Switching Power Supply does not work.When control circuit works, the Switching Power Supply it is defeated
The monomer Cn chargings gone out in the super capacitor group for several super capacitor monomer compositions.Super capacitor monomer Cn electricity
Pressure is under normal circumstances between 0V~2.7V, but when the super capacitor group is externally discharged, it is possible to negative pressure occurs, i.e.,
Voltage between the Vo+ and 0V of Switching Power Supply is negative pressure, in super-capacitor voltage management system, has detection circuit to detect in real time
The voltage of each monomer of super capacitor, when detecting that a certain monomer Cn has negative pressure, an enable signal can be sent and held to corresponding
The Enable Pin EN of powered-down source module makes its control circuit not work.
When the Switching Power Supply works：High frequency transformer T1 primary side winding is connected with primary side main switch S1, primary side around
The termination of the same name input of group, different name termination primary side main switch S1 drain electrode, main switch S1 source electrode connection primary side ground terminal
GND_P.Winding N3 Same Name of Ends connection diode D1 anode, diode D1 negative electrode are connected and are designated as with electric capacity C1 one end
The output plus terminal A of auxiliary power unit, winding N3 different name end are connected with the electric capacity C1 other end and are designated as auxiliary power unit
201 output reference point B.Export the secondary ground terminal PGND_S of reference point B connection main power circuits.
Primary side main switch S1 continuous firings in work generate one in conducting and cut-off state on primary side winding Np
It is individual have just have negative pulse voltage, vice-side winding Ns couplings primary side winding Np voltage, after diode D0, electric capacity C0 filtering,
It is output to the anode of super capacitor monomer；Winding N3 coupling primary side windings Np voltage, also producing one has positive and negative pulse
Voltage, after diode rectification D1, electric capacity C1 filtering, one DC voltage of output is to voltage regulation unit 202, and the DC voltage is through electricity
It is after-applied on voltage-regulator diode Z1 to hinder R2 current limlitings, voltage is formed on voltage-stabiliser tube Z1, resistance R2 limitations flow through voltage-regulator diode
Z1 electric current, ensure that voltage-regulator diode Z1 cathode voltage is stablized and prevents the voltage-regulator diode by excessive circuit damage, surely
Fixed voltage-regulator diode Z1 cathode voltage is supplied to the triode Q1 of voltage adjustment base stage, the output electricity of voltage regulation unit 202
The emitter voltage of pressure i.e. triode Q1, stablized base voltage institute clamper, form stable output voltage and be transported to out
Between the gate-to-source for closing the metal-oxide-semiconductor TR1 of unit 203, to produce a sufficiently high voltage by auxiliary power unit 201,
Voltage regulation unit 202 is supplied to, then voltage stabilizing is carried out by voltage regulation unit 202, is exported to switch element 203.Voltage stabilizing output voltage one
As design in 10V~12V, the voltage makes anti-reverse metal-oxide-semiconductor TR1 saturation conductions enough, i.e. switch element 203 is sufficiently conductive, leads
The resistance that is powered is small, Switching Power Supply normally, low consumption is charged to super capacitor.
When Switching Power Supply does not work：Because Switching Power Supply does not work, the high-frequency power transformer of Switching Power Supply does not work,
The winding N3 of auxiliary power unit 201 is not coupled to transformer T1 energy, and auxiliary power unit 201 can not be subsequently steady
Unit 202 is pressed to provide voltage, voltage-regulator diode Z1 does not work, and triode Q1 does not work, electric capacity C2 and metal-oxide-semiconductor TR1 grid electricity
Electric charge in appearance discharges through resistance R3, the metal-oxide-semiconductor TR1 of switch element 203 be not applied in sufficiently high grid-source voltage from
And be in cut-off state, internal resistance is very big, equivalent to open circuit, i.e., Switching Power Supply do not work or be enabled control do not work when,
Make 203 synchronous reliable turn-off of switch element, protection switch power supply is not because of output end super capacitor error-polarity connection or other forms
Caused by negative voltage and damage, so as to play the purpose of protection switch power supply.
Case study on implementation two
It please refer to Fig. 4, a kind of output protection circuit of Switching Power Supply, including high frequency transformer T1, auxiliary power unit
301, voltage regulation unit 302 and switch element 303, when Switching Power Supply works, the coupled switch power supply of auxiliary power unit 301
The energy of high frequency transformer exports a DC voltage after its internal rectifying and wave-filtering, and the voltage passes through the voltage stabilizing of voltage regulation unit 302
After be transported on switch element 303, for give switch element 303 provide auxiliary power supply, to be produced by auxiliary power unit 301
One sufficiently high voltage, there is provided carry out voltage stabilizing to voltage regulation unit 302, then by voltage regulation unit 302, export to switch element
303.Voltage stabilizing output voltage is typically designed in 10V~12V, and the voltage makes anti-reverse metal-oxide-semiconductor TR1 saturation conductions enough, even if opening
Pass unit 303 is sufficiently conductive, and conducting resistance is small, so as to ensure that Switching Power Supply is normal, export to low consumption and charged to super capacitor；
When Switching Power Supply does not work, auxiliary power unit 301 is not worked, and switch element 303 is applied to without sufficiently high driving voltage
On, make 303 synchronous reliable turn-off of switch element, protection switch power supply is not because of output end super capacitor error-polarity connection or other shapes
Negative voltage caused by formula and damage.
Preferably, high frequency transformer T1, auxiliary power unit 301, the structure of switch element 303 and its principle and embodiment one
High frequency transformer T1, power supply unit 201, switch element 203 it is basically identical, difference is in voltage regulation unit 302 compared with embodiment
Slightly different for voltage regulation unit 202 in one, i.e., directly does voltage regulation unit with a resistance and a voltage-stabiliser tube, component is more
Few, cost is lower, can be applied to above the input voltage range switch power module slightly narrower than embodiment one.A kind of Switching Power Supply
Output protection circuit, wherein, voltage regulation unit 302 includes resistance R1 and voltage-regulator diode Z2, resistance R1 one end connection auxiliary
The output terminals A of power supply unit 301, resistance R1 other end connection voltage-regulator diode Z1 negative electrode are simultaneously designated as the output of voltage regulation unit
C is held, voltage-regulator diode Z1 anode is connected to the output reference point B of auxiliary power unit 301.Export the main work(of reference point B connections
The secondary ground terminal PGND_S of rate circuit.
The operation principle of voltage regulation unit 302：When Switching Power Supply works, the voltage that auxiliary power unit 301 exports is through electricity
It is transported to after resistance R1 current limlitings on voltage-stabiliser tube Z2 negative electrode, the voltage on voltage-stabiliser tube Z2 negative electrode is stabilized in its voltage stabilized range,
It is output to conducting of the switch element 303 with controlling switch unit.When Switching Power Supply does not work, the not work of auxiliary power unit 301
Make, be applied to without sufficiently high driving voltage on switch element 303, make 303 synchronous reliable turn-off of switch element, protection switch
Power supply not caused by output end super capacitor error-polarity connection or other forms negative voltage and damage.Remaining operation principle with
Embodiment one it is essentially identical, repeat no more here.
Above example is only intended to help and understands improvement of the present utility model and innovative idea, to the general of the art
For logical technical staff, on the premise of inventive principle is not departed from, by above description with illustrate can associate naturally it is other
Equivalent application scheme, and some improvement and modification are carried out to the utility model, such as mu balanced circuit in another form, than
Such as switch element is placed on the outside of switch power module to reduce volume, such as power topology in another form, for another example
Add the protection domain that TVS or some filter capacitors etc. each fall within claims of the present utility model.
Claims (5)
1. a kind of output protection circuit of Switching Power Supply, for being arranged between Switching Power Supply and super capacitor monomer, its feature
It is：Including auxiliary power unit, voltage regulation unit and switch element, switch element include metal-oxide-semiconductor TR1, auxiliary power unit
The winding N3 coupled including the power transformer with Switching Power Supply；
When Switching Power Supply works, the energy of the power transformer of the winding N3 coupled switch power supplys of auxiliary power unit and output
To voltage regulation unit, switch element is transported to after voltage regulation unit voltage stabilizing, to improve switch element by auxiliary power unit
Voltage to the saturation conduction requirement for meeting metal-oxide-semiconductor TR1, ensure that switch element is operated in the working condition of low on-resistance；
When Switching Power Supply does not work, auxiliary power unit does not work, and makes switch element synchronization reliable turn-off.
2. the output protection circuit of Switching Power Supply according to claim 1, it is characterised in that：Described auxiliary power supply list
Member, include diode D1 and electric capacity C1, winding N3 Same Name of Ends connection diode D1 anode, diode D1 negative electrode and electricity
The one end for holding C1 connects and is used as the output plus terminal of auxiliary power unit, and winding N3 different name end is connected with the electric capacity C1 other end
And secondary ground terminal is connected jointly.
3. the output protection circuit of Switching Power Supply according to claim 1, it is characterised in that：Described voltage regulation unit, bag
Include resistance R1, resistance R2, electric capacity C2, voltage-regulator diode Z1 and NPN triode Q1；Wherein resistance R1, resistance R2 one end are connected
And the output plus terminal of auxiliary power unit is connected to, and the colelctor electrode connection resistance R1 of the NPN triode Q1 other end, the poles of NPN tri-
The pipe Q1 base stages connection resistance R2 other end and voltage-regulator diode Z1 negative electrode, NPN triode Q1 emitter stage are connected to electric capacity C2
One end and be connected with voltage-regulator diode Z1 anode and connect jointly as the output plus terminal of voltage regulation unit, the electric capacity C2 other end
Connect secondary ground terminal.
4. the output protection circuit of Switching Power Supply according to claim 1, it is characterised in that：Described voltage regulation unit, bag
Include resistance R1 and voltage-regulator diode Z2, the output plus terminal of resistance R1 one end connection auxiliary power unit, the resistance R1 other end
Connect voltage-regulator diode Z2 negative electrode and as the output plus terminal of voltage regulation unit, voltage-regulator diode Z2 anode is with connecting secondary
End.
5. the output protection circuit of Switching Power Supply according to claim 1, it is characterised in that：Described switch element, bag
Resistance R3 and metal-oxide-semiconductor TR1 are included, metal-oxide-semiconductor TR1 grid is connected with resistance R3 one end and is connected to the output of voltage regulation unit just
End, metal-oxide-semiconductor TR1 source electrode are connected with the resistance R3 other end and are connected secondary ground terminal jointly, and metal-oxide-semiconductor TR1 drain electrode, which is drawn, to be made
For the output negative terminal of switch element, for being connected with the negative terminal of super capacitor monomer.
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| CN201720090605.3U CN206673569U (en) | 2017-01-22 | 2017-01-22 | The output protection circuit of Switching Power Supply |
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| CN201720090605.3U CN206673569U (en) | 2017-01-22 | 2017-01-22 | The output protection circuit of Switching Power Supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108336900A (en) * | 2017-12-21 | 2018-07-27 | 四川莱福德科技有限公司 | A kind of short-circuit protection circuit and power supply circuit |
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| WO2022141027A1 (en) * | 2020-12-29 | 2022-07-07 | 深圳欣锐科技股份有限公司 | Vehicle-mounted drive anti-reverse connection apparatus and device |
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2017
- 2017-01-22 CN CN201720090605.3U patent/CN206673569U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336900A (en) * | 2017-12-21 | 2018-07-27 | 四川莱福德科技有限公司 | A kind of short-circuit protection circuit and power supply circuit |
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| WO2022141027A1 (en) * | 2020-12-29 | 2022-07-07 | 深圳欣锐科技股份有限公司 | Vehicle-mounted drive anti-reverse connection apparatus and device |
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