CN105896474B - A kind of output voltage overvoltage crowbar and system for Switching Power Supply - Google Patents
A kind of output voltage overvoltage crowbar and system for Switching Power Supply Download PDFInfo
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- CN105896474B CN105896474B CN201610369763.2A CN201610369763A CN105896474B CN 105896474 B CN105896474 B CN 105896474B CN 201610369763 A CN201610369763 A CN 201610369763A CN 105896474 B CN105896474 B CN 105896474B
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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
- H02H7/1203—Circuits independent of the type of conversion
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of output voltage overvoltage crowbars and system for Switching Power Supply, including：Input terminal is coupled in the Voltage to current transducer module of circuit power anode by divider resistance；First input end is coupled in the Voltage to current transducer module output end, and the second input terminal is used to receive the output voltage computing module of load circuit feedback signal；First input end is used to receive the output voltage that the output voltage computing module conveying comes, and the second input terminal is used to couple the voltage comparison module of reference voltage；The output end output control signal of the voltage comparison module, for controlling cut-out/unlatching Switching Power Supply power supply.The present invention helps to reduce the volume of product.
Description
Technical field
The present invention relates to over-voltage protection technology fields, are protected more particularly to a kind of output voltage overvoltage for Switching Power Supply
Protection circuit and system.
Background technology
Output over-voltage protection (Over Power Protection, OVP) is a kind of prerequisite basic training of Switching Power Supply
It can, it is intended to which under output open circuit or other abnormal conditions, protection output voltage is unlikely to the too high of rising and burns out and export
Hold the electrolytic capacitor being connected or other devices.The top priority of over-voltage protecting function is exactly first to want to detect output electricity
Pressure, then when output voltage is greater than the set value, system is at guard mode, limits the further raising of output voltage.Limit
The mode of system mainly makes Switching Power Supply failure of oscillation, just restarts work when output voltage meets certain condition.
The output voltage of existing Switching Power Supply protects circuit, and additional winding and resistance is needed to detect output voltage,
Thus the complexity, cost, volume of system is made all to be increased.This hopes the application of many volumes and cost sensitivity and gives birth to
Fear, such as LED illumination.The price of LED lamp bead particle constantly declines due to production capacity abundance and capturing for technical barrier in recent years.
Cost ratio shared by driving circuit constantly rises, and this requires driving circuits cost must be gone on doing, could with it is current
LED illumination matches.Therefore, the scheme with auxiliary winding is increasingly abandoned.On the other hand, many fields of LED illumination require electricity
The volume in source is very small, such as bulb lamp, shot-light etc., and since lamp cap volume is very small, driving power, which is wanted to put in, just must
What must be done is very simple, and volume is very small.
I.e. in the prior art, either isolated converter type either buck topology structure type, be required for change
Depressor, and it includes the very large winding of volume, this does not obviously meet the demand of art technology development.
It should be noted that above to the introduction of technical background be intended merely to it is convenient to the technical solution of the application carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Cannot merely because these schemes the application's
Background technology part is expounded and thinks that above-mentioned technical proposal is known to those skilled in the art.
Invention content
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide one kind to help to reduce
The output voltage overvoltage crowbar and system for Switching Power Supply of small product size.
To achieve the above object, the present invention provides a kind of output voltage overvoltage crowbar for Switching Power Supply, packets
It includes：
Input terminal is coupled in the Voltage to current transducer module of circuit power anode by divider resistance；
First input end is coupled in the Voltage to current transducer module output end, and the second input terminal is for receiving load circuit
The output voltage computing module of feedback signal；
First input end is used to receive the output voltage that the output voltage computing module conveying comes, and the second input terminal is used for
Couple the voltage comparison module of reference voltage；
The output end output control signal of the voltage comparison module, for controlling cut-out/unlatching Switching Power Supply power supply.
Further, the output voltage computing module includes a power supply, equalizing charge node, filter, integral
Capacitance, controlled current source and voltage current adapter；
One end of the equalizing charge node is coupled in by the first switch controlled by the load circuit feedback signal
The output end of the Voltage to current transducer module, meanwhile, pass through the second switch coupling controlled by the load circuit feedback signal
Together in the input terminal of the controlled current source, the output end of the controlled current source is grounded, and the power supply passes through the electricity
Voltage-current converter is coupled in the input terminal of the first switch；
The other end of the equalizing charge node is coupled to the defeated of the output voltage computing module by the filter
Outlet；
The equalizing charge node is also grounded by an integrating capacitor；
The output end of the output voltage computing module is coupled in the controlled current flow by the voltage current adapter
The input terminal in source, meanwhile, it is coupled in the input terminal of the voltage comparison module；
When the load circuit feedback signal level is 1, the first switch conducting；The load circuit feedback signal electricity
It puts down when being 1 or 0, the second switch conducting.This is a degeneration factor, current source I110, controlled current source I210, first
Switch S0, second switch S1, integrating capacitor C0, filter 21 and voltage current adapter 22, wherein I110 is input voltage
The current source that is generated after Voltage to current transducer module 110 of partial pressure, first switch S0 is controlled by Ton, when Ton is ' 1 ',
For inductive current charge cycle, switch S0 conductings charge to C0；I210 is controlled current source, by the average electricity of integrating capacitor C0
The control of pressure, when equalizing charge node (COMP nodes) voltage is high, I210 electric currents also increase, by the control of second switch S1
Afterwards, the drop-down of COMP nodes effect is also increased, to make COMP voltages decline, eventually forms a balance, COMP nodes are flat
Weighing apparatus, it is meant that fill a charge and put a charge balance；This makes the circuit base that has been calculated of output voltage, output voltage meter
Calculation will directly influence whether overvoltage protection action executes, i.e., this programme is the guarantee realized load circuit voltage measurement and calculated,
And then influence the Important Circuit that overvoltage protection action executes.
Further, the controlled current source includes the third that input terminal is coupled in the second switch, output end is grounded
Metal-oxide-semiconductor；
The voltage current adapter includes the second metal-oxide-semiconductor that input terminal is coupled in the power supply；
Input terminal is coupled in the 5th metal-oxide-semiconductor of the second metal-oxide-semiconductor output end；
The transfer resistance that one end is coupled in the 5th metal-oxide-semiconductor output end, the other end is grounded；
Input terminal is coupled in the power supply, control terminal is coupled in the 6th metal-oxide-semiconductor of the second metal-oxide-semiconductor control terminal；
Input terminal is coupled in the 6th metal-oxide-semiconductor output end, control terminal be coupled in the third metal-oxide-semiconductor control terminal
Four metal-oxide-semiconductors；
The control terminal and output end of second metal-oxide-semiconductor are coupled by conducting wire, the control terminal of the 4th metal-oxide-semiconductor and input
End is coupled by conducting wire.When TON controls first switch conducting, charge to integrating capacitor, then voltage at equalizing charge node COMP
It increases, this makes filter voltage increase, and filter voltage increases, then the electric current of voltage current adapter also increases, and causes
Electric current at I210 increases so that being acted on the drop-down of equalizing charge node at second switch enhances, and drags down at COMP by force
Voltage so that the circuit is in a charge balance state, and is reacted for output voltage with this so that the calculating of output voltage is steady
It is fixed and accurate, it is beneficial to improving over-voltage protecting function.
Further, the output voltage computing module further includes the 7th MOS that input terminal is coupled in the power supply
Pipe；
The control terminal of 7th metal-oxide-semiconductor is coupled in the output end of second metal-oxide-semiconductor；
The output end of the output voltage computing module is coupled in the output end of the 7th metal-oxide-semiconductor；
One end is coupled in the output end of the output voltage computing module, the second resistance of other end ground connection；
The first input end of the voltage comparison module is coupled between the 7th metal-oxide-semiconductor and second resistance, for connecing
Receive the output voltage that the output voltage computing module conveying comes；
It is defeated after the output voltage is compared by the voltage comparison module with the reference voltage that the second input terminal receives
Go out to control signal, for controlling cut-out/unlatching Switching Power Supply power supply.Wherein, the output end of the output voltage computing module, that is, scheme
Shown in V0 can also be coupled directly to the control terminal of the 5th metal-oxide-semiconductor, this will make the voltage of the V0 be equivalent to COMP
The voltage at place achievees the purpose that output voltage exports, certainly, whether no matter being directly connected to, VcompAnd V0All be it is relevant, can be with
Interreaction is sought, by the output voltage be output to voltage comparison module be made whether overvoltage judge after, you can according to judge tie
Fruit decides whether to carry out overvoltage protection operation.
Further, the voltage comparison module includes that control terminal is coupled in the output voltage computing module output end
8th metal-oxide-semiconductor；
Input terminal is coupled in the power supply, output end is coupled in the 12nd MOS of the 8th metal-oxide-semiconductor input terminal
Pipe；
Control terminal is coupled in the 9th metal-oxide-semiconductor of the reference voltage；
Input terminal is coupled in the power supply, output end is coupled in the 9th metal-oxide-semiconductor input terminal, control terminal is coupled in
11st metal-oxide-semiconductor of the 12nd metal-oxide-semiconductor control terminal；
Input terminal is coupled respectively to the tenth metal-oxide-semiconductor of the 8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor output end, output end ground connection；
Input terminal is coupled in the power supply, control terminal is coupled in the 13rd MOS of the 12nd metal-oxide-semiconductor output end
Pipe；
Input terminal is coupled in the 13rd metal-oxide-semiconductor output end, and control terminal is coupled in the tenth metal-oxide-semiconductor control terminal, defeated
14th metal-oxide-semiconductor of outlet ground connection；
The output end of the voltage comparison module is between the 13rd metal-oxide-semiconductor and the 14th metal-oxide-semiconductor.
Further, the filter includes a filter resistance and filter capacitor；
One end of the filter resistance is coupled in the equalizing charge node, and the other end is coupled in the 5th metal-oxide-semiconductor
Control terminal, while being grounded by the filter capacitor.Voltage comparison module according to output voltage computing module convey come output
Voltage after being compared with reference voltage, decides whether output control signal, to control the power supply of cut-out/unlatching load circuit.
Further, the Voltage to current transducer module includes that control terminal is coupled in the circuit by the divider resistance
17th metal-oxide-semiconductor of positive pole；
The 3rd resistor that one end is coupled in the 17th metal-oxide-semiconductor output end, the other end is grounded；
Input terminal is coupled in the power supply, output end is coupled in the 16th MOS of the 17th metal-oxide-semiconductor input terminal
Pipe, the control terminal and output end of the 16th metal-oxide-semiconductor are coupled by conducting wire；
The Voltage to current transducer module further includes that input terminal is coupled in the power supply, control terminal is coupled in described
The control terminals of 16 metal-oxide-semiconductors, output end are by being coupled in the 15th metal-oxide-semiconductor of the first switch input terminal.Pass through the 17th
The cooperation of metal-oxide-semiconductor, the 16th metal-oxide-semiconductor and the 15th metal-oxide-semiconductor and 3rd resistor converts input voltage into electric current, and conveys
It is calculated to output voltage computing module, in the module, the measurement of output voltage can be completed without winding etc., greatly
Reduce the volume of product so that the product of the application present invention is more competitive.
The present invention also provides a kind of output voltage overvoltage protective systems, including any described one kind disclosed by the invention
Output voltage overvoltage crowbar and input terminal are coupled in the load circuit of the circuit power input terminal；
The output end of the load circuit is coupled in the circuit power cathode by a switching tube, meanwhile, ground connection；
The output end of the voltage comparison module is coupled in the control terminal of the switching tube by a rest-set flip-flop；
Second input terminal of the output voltage computing module is coupled in the control terminal of the switching tube, described for acquiring
Load circuit feedback signal；
It is also in series with divider resistance and the second divider resistance, the voltage and current between the circuit power anode and cathode
The input terminal of conversion module is coupled between the divider resistance and the second divider resistance.The solution of the present invention, need not be additional
Inductor winding, structure is very simple, and cost is also low.In addition, since input signal VIN is fixed DC signals, its partial pressure, or
Person conversion current signal, be all a DC signal, therefore, the operation is stable, be not present noise jamming the problem of.
The present invention also provides a kind of output voltage overvoltage protective systems, including any described one kind disclosed by the invention
Output voltage overvoltage crowbar and input terminal are coupled in the load circuit of the circuit power input terminal；
The output end of the load circuit is grounded by a switching tube；
The output end of the voltage comparison module is coupled in the control terminal of the switching tube by a rest-set flip-flop；
Second input terminal of the output voltage computing module is coupled in the control terminal of the switching tube, for acquiring load
Circuit feedback signal；
The circuit power anode is coupled in the input terminal of the Voltage to current transducer module by the divider resistance.
Further, the Voltage to current transducer module includes control terminal by the voltage-controlled tenth of the divider resistance
Seven metal-oxide-semiconductors；
Input terminal is coupled in circuit power anode by the divider resistance, and control terminal is coupled in the 17th metal-oxide-semiconductor
Control terminal, output end ground connection the 18th metal-oxide-semiconductor；
Output end is coupled in the 16th metal-oxide-semiconductor of the 17th metal-oxide-semiconductor input terminal；
The input terminal of 16th metal-oxide-semiconductor is coupled in the power supply, the control terminal of the 16th metal-oxide-semiconductor and defeated
Outlet is coupled by conducting wire；
The Voltage to current transducer module further includes that control terminal is coupled in the control terminal of the 16th metal-oxide-semiconductor, input terminal
The power supply, output end are coupled in by being coupled in the 15th metal-oxide-semiconductor of the first switch input terminal.
Further, the load circuit includes that one end is coupled in the circuit power anode, and the other end is coupled in described
The load capacitance of switching tube input terminal；
It is connected in parallel on the load resistance at the load capacitance both ends；
Anode is coupled in the switching tube input terminal, negative couplings in the loading-diode of circuit power anode；
One end is coupled in the load capacitance and load resistance, and the other end is coupled in the load electricity of the switching tube input terminal
Sense.
The beneficial effects of the invention are as follows：The present invention is due to being provided with Voltage to current transducer module, the voltage for that will input
Signal is converted into current signal, then for calculating output voltage, then current signal is transported to output voltage computing module
By voltage comparator, threshold voltage is compared in other words with reference voltage again, to decide whether the confession of cut-out switch power supply
Electricity, to protect Circuits and Systems to be unlikely to burn out because of overtension；Due to the presence of voltage and current module, mistake of the invention
Voltage protection circuit no longer needs conventional winding, the so metal-oxide-semiconductor and electricity due to can be used for constituting Voltage to current transducer module
The devices such as resistance can be carried out integrating, thus be greatly reduced the volume of product, and production cost also decreases.
With reference to following description and accompanying drawings, the particular implementation of the application is disclosed in detail, specifies the original of the application
Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in range.In appended power
In the range of the spirit and terms that profit requires, presently filed embodiment includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It is used in a other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Description of the drawings
Included attached drawing is used for providing being further understood from the embodiment of the present application, and which constitute one of specification
Point, for illustrating presently filed embodiment, and with verbal description come together to illustrate the principle of the application.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound
Under the premise of the property made is laborious, other drawings may also be obtained based on these drawings.In the accompanying drawings：
Fig. 1 is the buck topology structural schematic diagram of Switching Power Supply in the prior art of the invention；
Fig. 2 is the structural schematic diagram of present invention isolated converter in the prior art；
Fig. 3 is the schematic diagram of the output voltage computing module in the output voltage overvoltage crowbar of the embodiment of the present invention；
Fig. 4 is the physical circuit figure of the output voltage overvoltage crowbar of the embodiment of the present invention；
Fig. 5 is the schematic diagram of the output voltage overvoltage crowbar of the embodiment of the present invention；
The schematic diagram of the output voltage overvoltage protective system of Fig. 6 embodiment of the present invention three；
The physical circuit figure of the output voltage overvoltage crowbar of Fig. 7 embodiment of the present invention three.
Specific implementation mode
For a better understanding of the present invention, in this introductory section prior art：
As shown in Figure 1, being the buck topology structure (BUCK) in Switching Power Supply.Diode 10, transformer 11 and 17, and
Switch controller 14 constitutes the fundamental of step-down switching converter.12 be filter capacitor, and 13 be load.When load 13 occurs
When open circuit, output voltage will be increased constantly, until close to input voltage.And the highest pressure resistance of capacitance 12 may be much smaller than input electricity
Pressure, therefore and damage capacitance 12, or even explode, largely effect on security application.In existing various schemes, usually increase around
Group 17 and resistance 15,16 carry out overvoltage protection.
The Same Name of Ends of armature winding 11 and secondary windings 17 is as shown in Figure 1.When the conducting of the internal switch pipe of controller 14,
The ends D are connected to the ends S, show the conduction impedance of very little.11 both ends of armature winding are by positively biased (definition：11 both end voltage of winding is
From output voltage negative terminal to the voltage at the ends D), the electric current of inductance 11 gradually increases.Because the Same Name of Ends of winding 17 is positive electricity at this time
Pressure, the partial pressure VIN of resistance 15,16 is exactly negative voltage.The VIN is linear with output voltage, has reacted output voltage completely,
In this way, working as：When, that is, overvoltage, trigger controller occurs
Overvoltage protection.
In addition, the structure (flyback) of isolated converter as shown in Figure 2, also uses similar technology to realize overvoltage
Protection.Principle is substantially similar with buck configuration, is similarly to detect output voltage by additional inductor winding and electric resistance partial pressure,
To realize over-voltage protecting function.
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
All other embodiment that technical staff is obtained without making creative work should all belong to the application protection
Range.
Embodiment one：
Fig. 5 is a kind of schematic diagram of output voltage overvoltage crowbar for Switching Power Supply of the invention, referring to Fig. 5, one
Output voltage overvoltage crowbar of the kind for Switching Power Supply, including：
Input terminal VIN is coupled in the Voltage to current transducer module 110 of circuit power anode V by divider resistance R10；
First input end is coupled in 110 output end of Voltage to current transducer module, and the second input terminal is for receiving load circuit
The output voltage computing module 111 of feedback signal；
First input end is used to receive the output voltage V0 that the conveying of output voltage computing module 111 comes, and the second input terminal is used
In the voltage comparison module 112 of coupling reference voltage V REF；
The output end output control signal OVP of voltage comparison module 112, supplies for controlling cut-out/unlatching load circuit 100
Electricity.
The beneficial effects of the invention are as follows：The present invention is due to being provided with Voltage to current transducer module, the voltage for that will input
Signal is converted into current signal, then for calculating output voltage, then current signal is transported to output voltage computing module
By voltage comparator, threshold voltage is compared in other words with reference voltage again, to decide whether the confession of cut-out switch power supply
Electricity for scheming, in the specific implementation, works as output voltage to protect Circuits and Systems to be unlikely to burn out because of overtension
Vo>When VREF, voltage comparator 112 exports high level signal ' 1 ', which goes to turn off the switch pipe by rest-set flip-flop, to
It plays a protective role；Due to the presence of voltage and current module, overvoltage crowbar of the invention no longer needs conventional winding, such as
This is since the metal-oxide-semiconductor and the devices such as resistance that can be used for constituting Voltage to current transducer module can be carried out integrating, thus greatly
The volume for reducing product, and production cost also decreases.
Fig. 3 is the schematic diagram of the output voltage computing module in the output voltage overvoltage crowbar of the embodiment of the present invention；
Fig. 4 is the physical circuit figure of the output voltage overvoltage crowbar of the embodiment of the present invention, with reference to known to figure 3 and Fig. 4：
The present embodiment is preferred, and output voltage computing module 111 includes a power supply Vcom, equalizing charge node
COMP, filter 21, integrating capacitor C0, controlled current source I210 and voltage current adapter；
One end of equalizing charge node COMP is coupled in electricity by the first switch S0 controlled by load circuit feedback signal
The output end of current voltage conversion module 110, meanwhile, it is coupled in by the second switch controlled by load circuit feedback signal controlled
The input terminal of current source I210, the output end ground connection of controlled current source I210, power supply pass through Voltage to current transducer module coupling
Together in the input terminal of first switch S0；
The other end of equalizing charge node COMP is coupled to the output end of output voltage computing module 111 by filter 21
V0；
Equalizing charge node COMP also passes through an integrating capacitor C0 ground connection；
The output end V0 of output voltage computing module 111 is coupled in controlled current source I210 by voltage current adapter 22
Input terminal, meanwhile, be coupled in the input terminal of voltage comparison module 112；
When load circuit feedback signal level is 1, first switch conducting；When load circuit feedback signal level is 1 or 0,
Second switch is connected.This is a degeneration factor, current source I110, controlled current source I210, first switch S0, second switch
S1, integrating capacitor C0, filter 21 and voltage current adapter 22, wherein I110 is the partial pressure of input voltage VIN by electricity
The current source generated after current voltage conversion module 110, first switch S0 are controlled by Ton, when Ton is ' 1 ', are filled for inductive current
Electric period, switch S0 conductings charge to C0；I210 is controlled current source, is controlled by the average voltage of integrating capacitor C0, works as electricity
When lotus equilibrium node (COMP nodes) voltage is high, I210 electric currents also increase, after the control of second switch S1, to COMP nodes
Drop-down effect also increase, to make COMP voltages decline, eventually form a balance, COMP node balances, it is meant that fill a little
Charge and put a charge balance；This makes the circuit base that has been calculated of output voltage, output voltage calculating that will directly affect
Whether executed to overvoltage protection action, i.e., this programme is the guarantee realized load circuit voltage measurement and calculated, and then influences overvoltage
The Important Circuit that protection act executes.
The present embodiment is preferred, and controlled current source I210 includes that input terminal is coupled in second switch S1, output end is grounded
Third metal-oxide-semiconductor M3；
Voltage current adapter 22 includes the second metal-oxide-semiconductor M2 that input terminal is coupled in power supply Vcom；
Input terminal is coupled in the 5th metal-oxide-semiconductor M5 of the second metal-oxide-semiconductor M2 output ends；
The transfer resistance R0 that one end is coupled in the 5th metal-oxide-semiconductor M5 output ends, the other end is grounded；
Input terminal is coupled in power supply Vcom, control terminal is coupled in the 6th metal-oxide-semiconductor M6 of the second metal-oxide-semiconductor M2 control terminals；
Input terminal is coupled in the 6th metal-oxide-semiconductor M6 output ends, control terminal be coupled in third metal-oxide-semiconductor M3 control terminal the 4th
Metal-oxide-semiconductor M4；
The control terminal and output end of second metal-oxide-semiconductor M2 is coupled by conducting wire, and the control terminal and input terminal of the 4th metal-oxide-semiconductor M4 is logical
Cross conducting wire coupling.When TON controls first switch conducting, charging to integrating capacitor, then voltage increases at equalizing charge node COMP,
This makes filter voltage increase, and filter voltage increases, then the electric current of voltage current adapter also increases, and causes at I210
Electric current increases so that being acted on the drop-down of equalizing charge node at second switch enhances, and drags down the voltage at COMP by force so that
The circuit is in a charge balance state, and is reacted for output voltage with this so that and the calculating of output voltage is stable and accurate,
It is beneficial to improving over-voltage protecting function.
Wherein, I110×Ton=I210×(Ton+Toff)；
AndIf R is arranged0=R3；By first three
A formula substitutes into the 4th formula, can obtain：
And be arranged by different circuits, the relational expression that can obtain input voltage vin and output voltage Vo is：
Or
Comparison is it is found that Vcomp voltages are the products of output voltage and a constant, an only poor partial pressure, i.e.,：
Work as Vcomp>When VREF, you can calculate output overvoltage threshold value：
When, OVP occurs.
Adjust the value of R30 and R10, so that it may freely to adjust the value of OVP.
With this method, it is not necessarily to winding, for the volume compared with miscellaneous goods, improving the market competitiveness has very big help.
The present embodiment is preferred, and output voltage computing module 111 further includes that input terminal is coupled in power supply Vcom
Seven metal-oxide-semiconductor M7；
The control terminal of 7th metal-oxide-semiconductor M7 is coupled in the output end of the second metal-oxide-semiconductor M2；
The output end V0 of output voltage computing module 111 is coupled in the output end of the 7th metal-oxide-semiconductor M7；
One end is coupled in the output end of output voltage computing module 111, the second resistance R2 of other end ground connection；
The first input end of voltage comparison module 112 is coupled between the 7th metal-oxide-semiconductor M7 and second resistance R2, for receiving
The output voltage V0 that the conveying of output voltage computing module 111 comes；
After output voltage V0 is compared by voltage comparison module 112 with the reference voltage V REF that the second input terminal receives,
Output control signal OVP, for controlling cut-out/unlatching Switching Power Supply power supply.Wherein, the output voltage computing module 111 is defeated
Outlet, i.e., V0 shown in figure can also be coupled directly to the control terminal of the 5th metal-oxide-semiconductor M5, this will make the voltage of the V0 suitable
Voltage at COMP achievees the purpose that output voltage exports, and certainly, whether no matter being directly connected to, Vcomp is related to V0
, can be sought with interreaction, by the output voltage be output to voltage comparison module be made whether overvoltage judge after, you can according to
Judging result decides whether to carry out overvoltage protection operation.
The present embodiment is preferred, and voltage comparison module 112 is coupled in output voltage computing module 111 including control terminal and exports
Hold the 8th metal-oxide-semiconductor M8 of V0；
Input terminal is coupled in power supply Vcom, output end is coupled in the 12nd metal-oxide-semiconductor of the 8th metal-oxide-semiconductor M8 input terminals
M12；
Control terminal is coupled in the 9th metal-oxide-semiconductor M9 of reference voltage V REF；
Input terminal is coupled in power supply Vcom, output end is coupled in the 9th metal-oxide-semiconductor M9 input terminals, control terminal is coupled in
11st metal-oxide-semiconductor M11 of 12 metal-oxide-semiconductor M12 control terminals；
Input terminal is coupled respectively to the tenth metal-oxide-semiconductor of the 8th metal-oxide-semiconductor M8 and the 9th metal-oxide-semiconductor M9 output ends, output end ground connection
M10；
Input terminal is coupled in power supply Vcom, control terminal is coupled in the 13rd MOS of the 12nd metal-oxide-semiconductor M12 output ends
Pipe M13；
Input terminal is coupled in the 13rd metal-oxide-semiconductor M13 output ends, and control terminal is coupled in the tenth metal-oxide-semiconductor M10 control terminals, output
Hold the 14th metal-oxide-semiconductor M14 of ground connection；
The output end of voltage comparison module 112 M14 between the 13rd metal-oxide-semiconductor M13 and the 14th metal-oxide-semiconductor.
The present embodiment is preferred, and filter 21 includes a filter resistance R1 and filter capacitor C1；
One end of filter resistance R1 is coupled in equalizing charge node COMP, and the other end is coupled in the control of the 5th metal-oxide-semiconductor M5
End, while being grounded by filter capacitor C1.Voltage comparison module according to output voltage computing module convey come output voltage, with
After reference voltage is compared, decide whether output control signal, to control the power supply of cut-out/unlatching load circuit.
The present embodiment is preferred, and Voltage to current transducer module 110 includes that control terminal is coupled in circuit electricity by divider resistance
17th metal-oxide-semiconductor M17 of source V anodes；
The 3rd resistor R3 that one end is coupled in the 17th metal-oxide-semiconductor M17 output ends, the other end is grounded；
Input terminal is coupled in power supply Vcom, output end is coupled in the 16th MOS of the 17th metal-oxide-semiconductor M17 input terminals
The control terminal and output end of pipe M16, the 16th metal-oxide-semiconductor M16 are coupled by conducting wire；
Voltage to current transducer module 110 further includes that input terminal is coupled in power supply Vcom, control terminal is coupled in the 16th
The control terminal of metal-oxide-semiconductor M16, output end are by being coupled in the 15th metal-oxide-semiconductor M15 of first switch S0 input terminals.Pass through the 17th
The cooperation of metal-oxide-semiconductor, the 16th metal-oxide-semiconductor and the 15th metal-oxide-semiconductor and 3rd resistor converts input voltage into electric current, and conveys
It is calculated to output voltage computing module, in the module, the measurement of output voltage can be completed without winding etc., greatly
Reduce the volume of product so that the product of the application present invention is more competitive.
In addition, the connection of the control terminal about M10 in figure and M14, the grid of M10 connects bias voltage, to provide
The operating current of M11, M12, M8, M9；The grid of M14 also connects bias voltage, to provide the operating current of M13, bias voltage
From other circuits, since the bias voltage and the inventive point relationship of the present invention are little, thus no longer it is described in detail.
Embodiment two：
With reference to figure 5 and embodiment one, the present invention also provides a kind of output voltage overvoltage protective system, including the present invention are public
A kind of any described output voltage overvoltage crowbar and input terminal opened are coupled in the negative of the circuit power input terminal
Carry electricity 100；
The output end of load circuit 100 is coupled in circuit power V cathode by a switching tube MO, meanwhile, ground connection；
The output end of voltage comparison module 112 is coupled in the control terminal of switching tube M0 by a rest-set flip-flop；
Second input terminal of output voltage computing module 111 is coupled in the control terminal of switching tube M0, for acquiring load electricity
Road feedback signal；
It is also in series with divider resistance R10 and the second divider resistance R30, voltage and current between circuit power V anodes and cathode
The input terminal of conversion module is coupled between divider resistance R10 and the second divider resistance R30.TON is exactly out for what " 1 " referred in fact
The time that the time that pass pipe M0 is opened, its grid level was 1 in other words.
Other than helpful to reduction small product size；It is detected due in the prior art, needing the voltage division signal of resistance
Overvoltage.The voltage division signal VIN of resistance is a switching signal, and switching frequency is generally between 20KHZ~120KHZ.It is so high
Frequency continuous saltus step between positive and negative signal, be very big interference to system.This phenomenon is one in practical applications
A very troubling problem.Many troubles are brought to the reliability service of PCB layout and circuit.And the solution of the present invention, no
Additional inductance winding is needed, structure is very simple, and cost is also low.In addition, since input signal VIN is fixed DC signals, it
Partial pressure, or conversion current signal, be all a DC signal, therefore, the operation is stable, be not present noise jamming the problem of.
Embodiment three：
The schematic diagram of the output voltage overvoltage protective system of the embodiment of the present invention three shown in Fig. 6, Fig. 7 are the corresponding mistakes of Fig. 6
The circuit diagram of voltage protection circuit, in conjunction with Fig. 6 and Fig. 7 it is found that the present invention also provides a kind of output voltage overvoltage protective system, packet
It includes a kind of any described output voltage overvoltage crowbar and input terminal disclosed by the invention and is coupled in the circuit power
The load circuit of input terminal；
The output end of load circuit 100 passes through a switching tube M0 ground connection；
The output end of voltage comparison module 112 is coupled in the control terminal of switching tube M0 by a rest-set flip-flop；
Second input terminal of output voltage computing module 11 is coupled in the control terminal of switching tube M0, for acquiring load circuit
Feedback signal；
Circuit power V anodes are coupled in the input terminal of Voltage to current transducer module 110 by divider resistance R10.
Other than helpful to reduction small product size；In actual application, resistance R10 also takes into account start-up resistor simultaneously
Effect.This start-up resistor is also existing (such as start-up resistor 19 of Fig. 1) in general scheme.Therefore, of the invention
The technical solution proposed does not need additional inductance winding, does not introduce any additional element yet, and application structure is extremely simple.
This is in present LED illumination etc. under the extremely stringent occasion of circuit board volume requirement, it appears very attractive.
The present embodiment is preferred, and Voltage to current transducer module includes control terminal by voltage-controlled the of divider resistance R10
17 metal-oxide-semiconductor M17；
Input terminal is coupled in circuit power V anodes by divider resistance, and control terminal is coupled in the control of the 17th metal-oxide-semiconductor M17
End processed, output end ground connection the 18th metal-oxide-semiconductor M18；
Output end is coupled in the 16th metal-oxide-semiconductor M16 of the 17th metal-oxide-semiconductor M17 input terminals；
The input terminal of 16th metal-oxide-semiconductor M16 is coupled in power supply, and the control terminal and output end of the 16th metal-oxide-semiconductor M16 is logical
Cross conducting wire coupling；
Voltage to current transducer module 110 further includes that control terminal is coupled in the control terminal of the 16th metal-oxide-semiconductor M16, input terminal coupling
Together in power supply, output end by being coupled in the 15th metal-oxide-semiconductor M15 of first switch S0 input terminals.
It is currently preferred, in the output voltage overvoltage crowbar and system recorded in the present invention, for scheming, load
Circuit can be the setting as being, load circuit 100 is coupled in circuit power V anodes including one end, and the other end is coupled in switch
The load capacitance C of pipe input terminal；
It is connected in parallel on the load resistance R at the both ends load capacitance C；
Anode is coupled in switching tube MO input terminals, negative couplings in the loading-diode D0 of circuit power V anodes；
One end is coupled in load capacitance C and load resistance R, and the other end is coupled in the load inductance of switching tube M0 input terminals
L0。
In the case of the resistance R30 in removing embodiment two, the voltage and current in output voltage overvoltage crowbar turns
Mold changing block can be changed in this way, and certainly, the modification of other adaptability is also possible, does not repeat one by one herein.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (10)
1. a kind of output voltage overvoltage crowbar for Switching Power Supply, which is characterized in that including：
Input terminal is coupled in the Voltage to current transducer module of circuit power anode by divider resistance；
First input end is coupled in the Voltage to current transducer module output end, and the second input terminal is for receiving load circuit feedback
The output voltage computing module of signal；
First input end is used to receive the output voltage that the output voltage computing module conveying comes, and the second input terminal is for coupling
The voltage comparison module of reference voltage；
The output end output control signal of the voltage comparison module, for controlling cut-out/unlatching Switching Power Supply power supply；
The output voltage computing module includes a power supply, equalizing charge node, filter, integrating capacitor, controlled current flow
Source and voltage current adapter；
One end of the equalizing charge node is coupled in described by the first switch controlled by the load circuit feedback signal
The output end of Voltage to current transducer module, meanwhile, it is coupled in by the second switch controlled by the load circuit feedback signal
The input terminal of the controlled current source, the output end ground connection of the controlled current source, the power supply pass through voltage electricity
Stream transformer is coupled in the input terminal of the first switch；
The other end of the equalizing charge node is coupled to the output end of the output voltage computing module by the filter；
The equalizing charge node is also grounded by an integrating capacitor；
The output end of the output voltage computing module is coupled in the controlled current source by the voltage current adapter
Input terminal, meanwhile, it is coupled in the input terminal of the voltage comparison module；
When the load circuit feedback signal level is 1, the first switch conducting；The load circuit feedback signal level is
When 1 or 0, the second switch conducting.
2. output voltage overvoltage crowbar as described in claim 1, it is characterized in that：The controlled current source includes input terminal
It is coupled in the second switch, the third metal-oxide-semiconductor that output end is grounded；
The voltage current adapter includes the second metal-oxide-semiconductor that input terminal is coupled in the power supply；
Input terminal is coupled in the 5th metal-oxide-semiconductor of the second metal-oxide-semiconductor output end；
The transfer resistance that one end is coupled in the 5th metal-oxide-semiconductor output end, the other end is grounded；
Input terminal is coupled in the power supply, control terminal is coupled in the 6th metal-oxide-semiconductor of the second metal-oxide-semiconductor control terminal；Input
End be coupled in the 6th metal-oxide-semiconductor output end, control terminal be coupled in the third metal-oxide-semiconductor control terminal the 4th metal-oxide-semiconductor；
The control terminal and output end of second metal-oxide-semiconductor are coupled by conducting wire, and the control terminal and input terminal of the 4th metal-oxide-semiconductor are logical
Cross conducting wire coupling.
3. output voltage overvoltage crowbar as claimed in claim 2, it is characterized in that：The output voltage computing module also wraps
Include the 7th metal-oxide-semiconductor that input terminal is coupled in the power supply；
The control terminal of 7th metal-oxide-semiconductor is coupled in the output end of second metal-oxide-semiconductor；
The output end of the output voltage computing module is coupled in the output end of the 7th metal-oxide-semiconductor；
One end is coupled in the output end of the output voltage computing module, the second resistance of other end ground connection；
The first input end of the voltage comparison module is coupled between the 7th metal-oxide-semiconductor and second resistance, for receiving
State the output voltage that the conveying of output voltage computing module comes；
After the output voltage is compared by the voltage comparison module with the reference voltage that the second input terminal receives, output control
Signal processed, for controlling cut-out/unlatching Switching Power Supply power supply.
4. output voltage overvoltage crowbar as claimed in claim 3, it is characterized in that：The voltage comparison module includes control
End is coupled in the 8th metal-oxide-semiconductor of the output voltage computing module output end；
Input terminal is coupled in the power supply, output end is coupled in the 12nd metal-oxide-semiconductor of the 8th metal-oxide-semiconductor input terminal；
Control terminal is coupled in the 9th metal-oxide-semiconductor of the reference voltage；
Described in input terminal is coupled in the power supply, output end is coupled in the 9th metal-oxide-semiconductor input terminal, control terminal is coupled in
11st metal-oxide-semiconductor of the 12nd metal-oxide-semiconductor control terminal；
Input terminal is coupled respectively to the tenth metal-oxide-semiconductor of the 8th metal-oxide-semiconductor and the 9th metal-oxide-semiconductor output end, output end ground connection；
Input terminal is coupled in the power supply, control terminal is coupled in the 13rd metal-oxide-semiconductor of the 12nd metal-oxide-semiconductor output end；
Input terminal is coupled in the 13rd metal-oxide-semiconductor output end, and control terminal is coupled in the tenth metal-oxide-semiconductor control terminal, output end
14th metal-oxide-semiconductor of ground connection；
The output end of the voltage comparison module is between the 13rd metal-oxide-semiconductor and the 14th metal-oxide-semiconductor.
5. output voltage overvoltage crowbar as claimed in claim 2, it is characterized in that：The filter includes a filter resistance
And filter capacitor；
One end of the filter resistance is coupled in the equalizing charge node, and the other end is coupled in the control of the 5th metal-oxide-semiconductor
End, while being grounded by the filter capacitor.
6. output voltage overvoltage crowbar as described in claim 1, it is characterized in that：The Voltage to current transducer module includes
Control terminal is coupled in the 17th metal-oxide-semiconductor of the circuit power anode by the divider resistance；
The 3rd resistor that one end is coupled in the 17th metal-oxide-semiconductor output end, the other end is grounded；
Input terminal is coupled in the power supply, output end is coupled in the 16th metal-oxide-semiconductor of the 17th metal-oxide-semiconductor input terminal,
The control terminal and output end of 16th metal-oxide-semiconductor are coupled by conducting wire；
The Voltage to current transducer module further includes that input terminal is coupled in the power supply, control terminal is coupled in the described 16th
The control terminal of metal-oxide-semiconductor, output end are by being coupled in the 15th metal-oxide-semiconductor of the first switch input terminal.
7. a kind of output voltage overvoltage protective system for Switching Power Supply, it is characterized in that：Including any institutes of such as claim 1-6
A kind of output voltage overvoltage crowbar and input terminal stated are coupled in the load circuit of the circuit power input terminal；
The output end of the load circuit is coupled in the circuit power cathode by a switching tube, meanwhile, ground connection；
The output end of the voltage comparison module is coupled in the control terminal of the switching tube by a rest-set flip-flop；
Second input terminal of the output voltage computing module is coupled in the control terminal of the switching tube, for acquiring the load
Circuit feedback signal；
It is also in series with divider resistance and the second divider resistance, the Voltage to current transducer between the circuit power anode and cathode
The input terminal of module is coupled between the divider resistance and the second divider resistance.
8. a kind of output voltage overvoltage protective system for Switching Power Supply, it is characterized in that：Including any institutes of such as claim 1-5
A kind of output voltage overvoltage crowbar and input terminal stated are coupled in the load circuit of the circuit power input terminal；
The output end of the load circuit is grounded by a switching tube；
The output end of the voltage comparison module is coupled in the control terminal of the switching tube by a rest-set flip-flop；
Second input terminal of the output voltage computing module is coupled in the control terminal of the switching tube, for acquiring load circuit
Feedback signal；
The circuit power anode is coupled in the input terminal of the Voltage to current transducer module by the divider resistance.
9. a kind of output voltage overvoltage protective system as claimed in claim 8, it is characterized in that：
The Voltage to current transducer module includes voltage-controlled ten seven metal-oxide-semiconductor of the control terminal by the divider resistance；
Input terminal is coupled in circuit power anode by the divider resistance, and control terminal is coupled in the control of the 17th metal-oxide-semiconductor
End processed, output end ground connection the 18th metal-oxide-semiconductor；
Output end is coupled in the 16th metal-oxide-semiconductor of the 17th metal-oxide-semiconductor input terminal；
The input terminal of 16th metal-oxide-semiconductor is coupled in the power supply, the control terminal and output end of the 16th metal-oxide-semiconductor
It is coupled by conducting wire；
The Voltage to current transducer module further includes that control terminal is coupled in the control terminal of the 16th metal-oxide-semiconductor, input terminal coupling
In the power supply, output end by being coupled in the 15th metal-oxide-semiconductor of the first switch input terminal.
10. a kind of output voltage overvoltage protective system as described in claim 7-9 is any, it is characterized in that：
The load circuit includes that one end is coupled in the circuit power anode, and the other end is coupled in the switching tube input terminal
Load capacitance；
It is connected in parallel on the load resistance at the load capacitance both ends；
Anode is coupled in the switching tube input terminal, negative couplings in the loading-diode of circuit power anode；
One end is coupled in the load capacitance and load resistance, and the other end is coupled in the load inductance of the switching tube input terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610369763.2A CN105896474B (en) | 2016-05-30 | 2016-05-30 | A kind of output voltage overvoltage crowbar and system for Switching Power Supply |
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| CN201610369763.2A CN105896474B (en) | 2016-05-30 | 2016-05-30 | A kind of output voltage overvoltage crowbar and system for Switching Power Supply |
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| CN116131219B (en) * | 2023-02-16 | 2023-06-30 | 恩赛半导体(成都)有限公司 | Overvoltage protection circuit and electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497093A (en) * | 2011-11-11 | 2012-06-13 | 无锡华润上华科技有限公司 | Output over-voltage protection circuit for power factor corrector |
| CN104093254A (en) * | 2014-07-22 | 2014-10-08 | 矽力杰半导体技术(杭州)有限公司 | LED overvoltage detection circuit, drive circuit and LED illuminating system |
| CN104716836A (en) * | 2013-12-12 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Control circuit and method for switching power converter |
-
2016
- 2016-05-30 CN CN201610369763.2A patent/CN105896474B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497093A (en) * | 2011-11-11 | 2012-06-13 | 无锡华润上华科技有限公司 | Output over-voltage protection circuit for power factor corrector |
| CN104716836A (en) * | 2013-12-12 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Control circuit and method for switching power converter |
| CN104093254A (en) * | 2014-07-22 | 2014-10-08 | 矽力杰半导体技术(杭州)有限公司 | LED overvoltage detection circuit, drive circuit and LED illuminating system |
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