CN206250751U - Switching Power Supply with overheat protector - Google Patents
Switching Power Supply with overheat protector Download PDFInfo
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- CN206250751U CN206250751U CN201621404980.2U CN201621404980U CN206250751U CN 206250751 U CN206250751 U CN 206250751U CN 201621404980 U CN201621404980 U CN 201621404980U CN 206250751 U CN206250751 U CN 206250751U
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Abstract
The utility model proposes a kind of Switching Power Supply with overheat protector; it includes input rectifying filter circuit, electric power management circuit, transformer circuit and output circuit; the transformer circuit includes armature winding, secondary windings and assists winding, and the output circuit includes rectifying and wave-filtering sub-circuit and overheat protector sub-circuit；Overheat protector sub-circuit can disconnect output when Switching Power Supply internal temperature is higher than preset temperature, stop powering to the load, therefore, it is possible to improve the security of Switching Power Supply.And circuit structure is simple, cost is relatively low, be easily achieved, with stronger practicality.
Description
Technical field
The utility model is related to power technique fields, more particularly to a kind of Switching Power Supply with overheat protector.
Background technology
Because energy-saving and environmental protection, it is efficient the advantages of, Switching Power Supply is widely used to various electric equipment products.It is big in Switching Power Supply
It is integrated with high pressure, high-power output circuit more, causes power to increase so that Switching Power Supply is operationally generated heat.In order to protect out
The chip in powered-down source, the Switching Power Supply of low-power in some can be in the integrated thermal-shutdown circuit of chip internal, to protect chip not
It is damaged.But the Switching Power Supply of thermal-shutdown circuit is not integrated with high power switching power supply, or other chips, often no
To protection so that the device in Switching Power Supply is damaged and even failed due to working long hours at relatively high temperatures.More severe patient,
Switching Power Supply may explode, and cause security incident.
Utility model content
In view of this, it is necessary to which a kind of Switching Power Supply with overheat protector is provided, can be high in Switching Power Supply internal temperature
When preset temperature, output is disconnected, stop powering to the load, therefore, it is possible to improve the security of Switching Power Supply.
A kind of Switching Power Supply with overheat protector, it includes input rectifying filter circuit, electric power management circuit, transformer electricity
Road and output circuit, the transformer circuit include armature winding, secondary windings and assists winding, and the output circuit includes whole
Stream filtering sub-circuit and overheat protector sub-circuit；
The input of the input rectifying filter circuit is used to access civil power, and the first of the input rectifying filter circuit is defeated
Go out the end connection armature winding first end, the second output end of the input rectifying filter circuit connects the power management electricity
The first input end on road；
Second input of the electric power management circuit connects the assists winding first end, the electric power management circuit
Output end connects the end of armature winding second, and the secondary windings first end connects the input of the rectifying and wave-filtering sub-circuit
End, the end of the secondary windings second and the end of the assists winding second are respectively used to ground connection；
The overheat protector sub-circuit includes relay K1, metal-oxide-semiconductor Q2, comparator U1, thermistor NTC2, electricity in parallel
The in-phase input end for hindering R03 and electric capacity C02, resistance R04, electrochemical capacitor EC02 and voltage-stabiliser tube D03, the comparator U1 passes through institute
The output end that thermistor NTC2 connects the rectifying and wave-filtering sub-circuit is stated, the in-phase input end of the comparator U1 is also connected with institute
The first end of the resistance R03 and electric capacity C02 of parallel connection is stated, the inverting input of the comparator U1 is connected by the resistance R04
The output end of the rectifying and wave-filtering sub-circuit, the inverting input of the comparator U1 is also respectively connected with the electrochemical capacitor EC02
Positive pole and the voltage-stabiliser tube D03 negative electrode, the negative pole of the electrochemical capacitor EC02, anode, the Yi Jisuo of the voltage-stabiliser tube D03
The second end for stating the resistance R03 and electric capacity C02 of parallel connection is respectively used to ground connection, and the output end of the comparator U1 connects the MOS
The grid of pipe Q2, the source electrode of the metal-oxide-semiconductor Q2 is used to be grounded, and the drain electrode of the metal-oxide-semiconductor Q2 passes through the coil of the relay K1
The output end of the rectifying and wave-filtering sub-circuit is connected, switch one end of the relay K1 connects the rectifying and wave-filtering sub-circuit
Output end, the switch other end of the relay K1 is used to connect load.
Wherein in one embodiment, the output circuit also includes voltage stabilizing sub-circuit, and the voltage stabilizing sub-circuit includes light
Electric coupler U2, source of stable pressure U3, electric capacity C6, resistance R21, resistance R22, resistance R24, resistance R25 and resistance R26 in parallel；
The first input end of the photoelectrical coupler U2 connects the defeated of the rectifying and wave-filtering sub-circuit by the resistance R21
Go out end, second input of the photoelectrical coupler U2 connects the power end of the source of stable pressure U3, the photoelectrical coupler U2's
Second input also order connects the output of the rectifying and wave-filtering sub-circuit by the electric capacity C6 for the connecting and resistance R24
End, first output end of the photoelectrical coupler U2 connects the 3rd input of the electric power management circuit, the photoelectric coupling
Second output end of device U2 is used to be grounded；
The reference voltage output terminal of the source of stable pressure U3 connects the series connection node of the electric capacity C6 and resistance R24, institute
The reference voltage output terminal for stating source of stable pressure U3 is also connected with one end of the resistance R25 in parallel and resistance R26, the electricity in parallel
The earth terminal of the other end and the source of stable pressure U3 that hinder R25 and resistance R26 is respectively used to ground connection.
Wherein in one embodiment, the input rectifying filter circuit include be linked in sequence first-level filtering marble circuit,
Secondary filter sub-circuit and rectifier bridge BD1, wherein the input of the first-level filtering marble circuit is used to access civil power, the one-level
The first output end for filtering sub-circuit connects the assists winding first end and the first of the secondary filter sub-circuit defeated respectively
Enter end, the second output end of the first-level filtering marble circuit is distinguished as the second output end of the input rectifying filter circuit
Connect the first input end of the electric power management circuit and the second input of the secondary filter sub-circuit；The rectifier bridge
First output end of BD1 connects the armature winding first end, institute as the first output end of the input rectifying filter circuit
Stating second output end of rectifier bridge BD1 is used to be grounded.
Wherein in one embodiment, the first-level filtering marble circuit includes common mode inductance LF1, piezo-resistance MOV1 and electricity
Hold CX1；
The first input end of the common mode inductance LF1 is used to connect live wire, and second input of the common mode inductance LF1 is used
In connection zero line, first output end of the common mode inductance LF1 connects the first input end of the secondary filter sub-circuit, described
Second output end of common mode inductance LF1 connects the second input of the secondary filter sub-circuit；
The two ends of the piezo-resistance MOV1 connect the first output end and the common mode electricity of the common mode inductance LF1 respectively
Feel second output end of LF1；
Two ends of the two ends of the electric capacity CX1 respectively with the piezo-resistance MOV1 are connected, the two ends point of the electric capacity CX1
Not as first output end and the second output end of the first-level filtering marble circuit of the first-level filtering marble circuit.
Wherein in one embodiment, the first-level filtering marble circuit also includes the fuse F2 and thermistor of series connection
The first output end order of NTC1, the common mode inductance LF1 is connected respectively by the fuse F2 and thermistor NTC1
Connect one end of the electric capacity CX1 and the first input end of the secondary filter sub-circuit.
Wherein in one embodiment, the Switching Power Supply also includes fuse F1, and the first of the common mode inductance LF1 is defeated
Enter end for connecting live wire by the fuse F1.
Wherein in one embodiment, the secondary filter sub-circuit includes common mode inductance LF2, the common mode inductance LF2
First input end connect the first output end of the first-level filtering marble circuit, second input of the common mode inductance LF2 connects
The second output end of the first-level filtering marble circuit is connect, first output end of the common mode inductance LF2 connects the rectifier bridge
First input end, second output end of the common mode inductance LF2 connects the second input of the rectifier bridge.
Wherein in one embodiment, the electric power management circuit includes power supply chip U1, chip power supply sub-circuit, parallel connection
Electric resistance array, electric capacity C3, electric capacity C4, resistance R1, resistance R3, resistance R6, resistance R7 and switching tube Q1；
The first input end of the chip power supply sub-circuit connects the second output end of the first-level filtering marble circuit, described
Second input of chip power supply sub-circuit connects the assists winding first end, and the output end of the chip power supply sub-circuit connects
The VDD pins of the power supply chip U1 are connect, the GATE pins of the power supply chip U1 connect the switch by the resistance R3
The grid of pipe Q1, the SENSE pins of the power supply chip U1 connect the electric capacity C3 first ends, the power supply chip U1's
SENSE pins also connect the first end of the parallel resistance array by resistance R7, the second end of the parallel resistance array and
The ends of electric capacity C3 second are respectively used to ground connection, and the PRT pins of the power supply chip U1 connect institute respectively by the resistance R1
The input and the assists winding first end of input rectifying filter circuit are stated, the PRT pins of the power supply chip U1 are additionally operable to
It is grounded by the resistance R33, the FB pins of the power supply chip U1 are used to be grounded by the resistance C4, the power supply chip
The GND pin of U1 is used to be grounded；
The drain electrode of the switching tube Q1 connects the end of armature winding second, described in the source electrode connection of the switching tube Q1 simultaneously
Join the first end of electric resistance array, the two ends of the resistance R6 connect the grid and source electrode of the switching tube Q1 respectively.
Wherein in one embodiment, the electric power management circuit also includes the resistance R5 and diode D4 of series connection, described
The negative electrode of diode D4 connects the GATE pins of the power supply chip U1 by the resistance R5, and the anode of the diode D4 connects
Connect the grid of the switching tube Q1.
Wherein in one embodiment, the parallel resistance array includes order resistance R8 to resistance R12 in parallel.
The above-mentioned Switching Power Supply with overheat protector, can be automatic to disconnect output when temperature is increased to preset temperature, stops
Power supply, to protect load and Switching Power Supply, so that the electrical security of lifting switch power supply.And circuit structure is simple, cost
It is relatively low, be easily achieved, with stronger practicality.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, the accompanying drawing of other embodiment can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the Switching Power Supply with overheat protector of the embodiment of the utility model one；
Fig. 2 is the structural representation of the Switching Power Supply with overheat protector of another embodiment of the utility model；
Fig. 3 is the structural representation of the Switching Power Supply with overheat protector of the another embodiment of the utility model；
Fig. 4 is the circuit diagram of the Switching Power Supply with overheat protector of the embodiment of the utility model one.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".In description of the present utility model,
" multiple " is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
The Switching Power Supply with overheat protector according to the utility model embodiment is described below in conjunction with the accompanying drawings.For example, this reality
With the Switching Power Supply 10 with overheat protector of a new embodiment, including：Input rectifying filter circuit, electric power management circuit, change
Transformer circuits and output circuit, transformer circuit include armature winding, secondary windings and assists winding, and output circuit includes rectification
Filtering sub-circuit and overheat protector sub-circuit；The input of input rectifying filter circuit is used to access civil power, input rectifying filtering
The first output end connection armature winding first end of circuit, the second output end connection power management electricity of input rectifying filter circuit
The first input end on road；The second input connection assists winding first end of electric power management circuit, the output of electric power management circuit
End connection armature winding second end, secondary windings first end connects the input of rectifying and wave-filtering sub-circuit, the end of secondary windings second
Ground connection is respectively used to the end of assists winding second.
Wherein, overheat protector sub-circuit includes relay K1, metal-oxide-semiconductor Q2, comparator U1, thermistor NTC2, in parallel
Resistance R03 and electric capacity C02, resistance R04, electrochemical capacitor EC02 and voltage-stabiliser tube D03, the in-phase input end of comparator U1 pass through temperature-sensitive
Resistance NTC2 connects the output end of rectifying and wave-filtering sub-circuit, the in-phase input end of comparator U1 be also connected with parallel connection resistance R03 and
The first end of electric capacity C02, the inverting input of comparator U1 connects the output end of rectifying and wave-filtering sub-circuit by resistance R04, than
Inverting input compared with device U1 is also respectively connected with the positive pole of electrochemical capacitor EC02 and the negative electrode of voltage-stabiliser tube D03, electrochemical capacitor EC02
Negative pole, the anode of voltage-stabiliser tube D03 and parallel connection resistance R03 and electric capacity C02 the second end be respectively used to ground connection, comparator
The grid of the output end connection metal-oxide-semiconductor Q2 of U1, the source electrode of metal-oxide-semiconductor Q2 is used to be grounded, and the drain electrode of metal-oxide-semiconductor Q2 is by relay K1's
Coil connects the output end of rectifying and wave-filtering sub-circuit, and switch one end of relay K1 connects the output end of rectifying and wave-filtering sub-circuit,
The switch other end of relay K1 is used to connect load.
For example, as shown in figure 1, the Switching Power Supply 10 with overheat protector of an embodiment, including：Input rectifying filter circuit
11st, electric power management circuit 12, transformer circuit 13 and output circuit 14, transformer circuit include armature winding, secondary windings and
Assists winding, output circuit 14 includes rectifying and wave-filtering sub-circuit 141 and overheat protector sub-circuit 142；Input rectifying filter circuit
Input be used to access civil power, the first output end connection armature winding first end of input rectifying filter circuit, input rectifying
Second output end of filter circuit connects the first input end of electric power management circuit；The second input connection of electric power management circuit
Assists winding first end, output end connection armature winding second end of electric power management circuit, the connection rectification of secondary windings first end
The input of sub-circuit is filtered, the end of secondary windings second and the end of assists winding second are respectively used to ground connection.Wherein, input rectifying filter
Wave circuit and filter rectification sub-circuit respectively further comprise the earth terminal for being grounded.
Wherein, overheat protector sub-circuit includes relay K1, metal-oxide-semiconductor Q2, comparator U1, thermistor NTC2, resistance
R03, electric capacity C02, resistance R04, electrochemical capacitor EC02 and voltage-stabiliser tube D03, wherein, resistance R03 and electric capacity C02 is in parallel, comparator
The in-phase input end of U1 connects the output end of rectifying and wave-filtering sub-circuit, the in-phase input end of comparator U1 by thermistor NTC2
The first end of the resistance R03 and electric capacity C02 of parallel connection is also connected with, the inverting input of comparator U1 connects rectification by resistance R04
The output end of sub-circuit is filtered, the inverting input of comparator U1 is also respectively connected with the positive pole and voltage-stabiliser tube of electrochemical capacitor EC02
The negative electrode of D03, the second of the resistance R03 and electric capacity C02 of the negative pole, the anode of voltage-stabiliser tube D03 and parallel connection of electrochemical capacitor EC02
End is respectively used to ground connection, and the grid of the output end connection metal-oxide-semiconductor Q2 of comparator U1, the source electrode of metal-oxide-semiconductor Q2 is used to be grounded, metal-oxide-semiconductor
The drain electrode of Q2 connects the output end of rectifying and wave-filtering sub-circuit by the coil of relay K1, and switch one end connection of relay K1 is whole
The output end of stream filtering sub-circuit, the switch other end of relay K1 is used to connect load.
Wherein, comparator U1 by rectifying and wave-filtering sub-circuit output voltage by after electric resistance partial pressure power.For example, rectification is filtered
The output end of marble circuit is also connected with the first end of a resistance R05, and second end of resistance R05 connects the power input of comparator U1
End.
Wherein, relay K1 is normally closed relay or normally opened relay.So that relay K1 is as normally closed relay as an example, when opening
During powered-down source normal work, comparator U1 output low level, metal-oxide-semiconductor Q2 cut-off, overheat protector sub-circuit normally export Vout to
Load supplying, the resistance of thermistor NTC2 is reduced with the rising of Switching Power Supply internal temperature, when Switching Power Supply inside temperature
When degree is increased to preset temperature, comparator U1 output high level so that metal-oxide-semiconductor Q2 is turned on, and relay K1's switches off, excess temperature
Protection sub-circuit stops output Vout, so as to realize protection.After the switching off of relay K1, if Switching Power Supply internal temperature drops
It is low to below preset temperature, due to the change in resistance of thermistor NTC2, comparator U1 outputs low level again, Switching Power Supply is extensive
Export again, again powering load.
Wherein, preset temperature is 150 DEG C~110 DEG C, and such as preset temperature is 120 DEG C.Can be according to the demand of preset temperature
Select the thermistor of relevant temperature coefficient.
The above-mentioned Switching Power Supply with overheat protector, can be automatic to disconnect output when temperature is increased to preset temperature, stops
Power supply, to protect load and Switching Power Supply, so that the electrical security of lifting switch power supply.And circuit structure is simple, cost
It is relatively low, be easily achieved, with stronger practicality.
Wherein in one embodiment, in order to reduce the noise of output signal, as shown in figure 4, overheat protector sub-circuit is also
Including electrochemical capacitor EC03 and electrochemical capacitor EC04 in parallel, the wherein positive pole of electrochemical capacitor EC03 and electrochemical capacitor EC04 just
Pole connects the output end of overheat protector sub-circuit, i.e., the output end of whole Switching Power Supply respectively；The negative pole of electrochemical capacitor EC03 and
The negative pole of electrochemical capacitor EC04 is respectively used to ground connection.
Wherein in one embodiment, output circuit also includes voltage stabilizing sub-circuit, as shown in Fig. 2 voltage stabilizing sub-circuit includes
Photoelectrical coupler U2, source of stable pressure U3, electric capacity C6, resistance R21, resistance R22, resistance R24, resistance R25 and resistance R26 in parallel；
Wherein the first input end of photoelectrical coupler U2 connects the output end of rectifying and wave-filtering sub-circuit, photoelectrical coupler by resistance R21
The power end of the second input connection source of stable pressure U3 of U2, the second input also order of photoelectrical coupler U2 passes through the electricity connected
Hold the output end that C6 and resistance R24 connects rectifying and wave-filtering sub-circuit, the first output end connection power management of photoelectrical coupler U2
3rd input of circuit, second output end of photoelectrical coupler U2 is used to be grounded；The reference voltage output terminal of source of stable pressure U3 connects
Connect the series connection node of electric capacity C6 and resistance R24, the resistance R25 and resistance of the reference voltage output terminal connection parallel connection of source of stable pressure U3
One end of R26, resistance R25 in parallel and the other end of resistance R26 and the earth terminal of source of stable pressure U3 are respectively used to ground connection.For example,
3rd input of electric power management circuit is the feedback pin of power supply chip U1, i.e. FB pins.
As a kind of implementation method, as shown in figure 4, voltage stabilizing sub-circuit also includes diode D04 and electrochemical capacitor in parallel
The negative electrode of EC04, diode D04 and the positive pole of electrochemical capacitor EC04 connect the output end of rectifying and wave-filtering sub-circuit respectively, for example,
The negative electrode of diode D04 and the positive pole of electrochemical capacitor EC04 connect the output end of rectifying and wave-filtering sub-circuit by resistance R05 respectively.
The anode of diode D04 and the negative pole of electrochemical capacitor EC04 are respectively used to ground connection.By diode D04 and electrochemical capacitor in parallel
EC04, further strengthens filter effect and voltage regulation result.
As a kind of implementation method, as shown in figure 4, voltage stabilizing sub-circuit also includes the resistance R23 and electric capacity C7 of series connection, wherein
Resistance R23 and electric capacity the C7 two ends of the series connection connect the power end and reference voltage output terminal of photo-coupler U3 respectively.
Wherein in one embodiment, as shown in figure 3, input rectifying filter circuit includes the first-level filtering marble being linked in sequence
Circuit 111, secondary filter sub-circuit 112 and rectifier bridge BD1, the wherein input of first-level filtering marble circuit are used to access civil power,
First output end of first-level filtering marble circuit connects the first input end of assists winding first end and secondary filter sub-circuit respectively,
Second output end of first-level filtering marble circuit connects power management electricity respectively as the second output end of input rectifying filter circuit
The first input end on road and the second input of secondary filter sub-circuit；First output end of rectifier bridge BD1 is used as input rectifying
The first output end connection armature winding first end of filter circuit, second output end of rectifier bridge BD1 is used to be grounded.
For example, first-level filtering marble circuit includes common mode inductance LF1, piezo-resistance MOV1 and electric capacity CX1；Common mode inductance LF1
First input end be used to connect live wire, second input of common mode inductance LF1 is used to connecting zero line, the of common mode inductance LF1
One output end connects the first input end of secondary filter sub-circuit, the second output end connection secondary filter of common mode inductance LF1
Second input of circuit；The two ends of piezo-resistance MOV1 connect first output end and common mode inductance of common mode inductance LF1 respectively
Second output end of LF1；Two ends of the two ends of electric capacity CX1 respectively with the piezo-resistance MOV1 are connected, the two ends point of electric capacity CX1
Not as first output end and the second output end of first-level filtering marble circuit of first-level filtering marble circuit.
Wherein, for the security of further lifting switch power supply, as shown in figure 4, first-level filtering marble circuit also includes string
The first output end order of the fuse F2 and thermistor NTC1 of connection, common mode inductance LF1 passes through fuse F2 and thermistor
NTC1 connects one end of the electric capacity CX1 and the first input end of secondary filter sub-circuit respectively, that is, the fuse F2 for connecting and
Thermistor NTC1 is arranged between piezo-resistance MOV1 and electric capacity CX1.
Wherein, for the security of further lifting switch power supply, as shown in figure 4, Switching Power Supply also includes fuse F1,
The first input end of common mode inductance LF1 is used to connect live wire by fuse F1.
For example, as shown in figure 4, secondary filter sub-circuit includes common mode inductance LF2, the first input end of common mode inductance LF2
Connect the first output end of first-level filtering marble circuit, the of the second input connection first-level filtering marble circuit of common mode inductance LF2
Two output ends, first output end of common mode inductance LF2 connects the first input end of rectifier bridge, second output of common mode inductance LF2
Second input of end connection rectifier bridge.
Wherein in one embodiment, as shown in figure 4, electric power management circuit includes power supply chip U1, chip power supply electricity
Road 121, parallel resistance array, electric capacity C3, electric capacity C4, resistance R1, resistance R3, resistance R6, resistance R7 and switching tube Q1；Chip is supplied
The first input end of electronic circuit connects the second output end of first-level filtering marble circuit, the second input of chip power supply sub-circuit
Connection assists winding first end, the VDD pins of the output end connection power supply chip U1 of chip power supply sub-circuit, power supply chip U1's
The grid that GATE pins pass through resistance R3 connecting valve pipes Q1, the SENSE pins connection electric capacity C3 first ends of power supply chip U1, electricity
The SENSE pins of source chip U1 also connect the first end of parallel resistance array, the second end of parallel resistance array by resistance R7
Ground connection is respectively used to the ends of electric capacity C3 second, the PRT pins of power supply chip U1 connect input rectifying and filter respectively by resistance R1
The input and assists winding first end of circuit, the PRT pins of power supply chip U1 are additionally operable to be grounded by resistance R33, power supply core
The FB pins of piece U1 are used to be grounded by resistance C4, and the GND pin of power supply chip U1 is used to be grounded；The drain electrode connection of switching tube Q1
The end of armature winding second, the source electrode of switching tube Q1 connects the first end of parallel resistance array, and the two ends of resistance R6 connect out respectively
Close the grid and source electrode of pipe Q1.For example, as shown in figure 4, parallel resistance array includes order resistance R8 in parallel to resistance R12,
For example, the identical settings of resistance R8 to resistance R11.
Wherein in one embodiment, as shown in figure 4, electric power management circuit also includes the resistance R5 and diode of series connection
The negative electrode of D4, diode D4 connects the GATE pins of power supply chip U1, the anode connecting valve pipe of diode D4 by resistance R5
The grid of Q1.
Wherein, the particular circuit configurations of chip power supply sub-circuit 121, the other elements of electric power management circuit and its connection is closed
System, see Fig. 4, and here is omitted.
Wherein in one embodiment, as shown in figure 4, rectifying and wave-filtering sub-circuit includes diode D02, electrochemical capacitor EC01
And the anode connection secondary windings first end of the resistance R01 and electric capacity C01 of series connection, wherein diode D02, diode D02's
Negative electrode connects the positive pole of electrochemical capacitor EC01 and the switch one of relay K1 respectively as the output end of rectifying and wave-filtering sub-circuit
End, the negative pole of electrochemical capacitor EC01 is used to be grounded；Diode D02 is in parallel with the resistance R01 and electric capacity C01 that connect.For example, two poles
Pipe D02 is made up of two diodes in parallel in the same direction.Wherein diode D02 is used to export rectification, resistance R01 and electric capacity C01 structures
Into a RC filter circuits, the signal to Circuit Fault on Secondary Transformer output is filtered.
Wherein in one embodiment, as shown in figure 4, transformer circuit also includes electric capacity C1, diode D1 and resistance R13
To resistance R18；Resistance R13 is in parallel with resistance R14, and the parallel circuit one end connects input rectifying filter circuit by electric capacity C1
First output end, the negative electrode of parallel circuit other end connection diode D1, the anode connection armature winding second of diode D1
End；Resistance R17 connects with resistance R15, and resistance R18 connects with resistance R16, also, resistance R17 is in parallel with resistance R18, resistance
R15 is in parallel with resistance R16, and resistance R17 is connected armature winding first end, resistance R15 and resistance with the sys node of resistance R18
The negative electrode of the sys node connection diode D1 of R16.
It should be noted that when an element is considered as " connection " another element, it can be directly to separately
One element may be simultaneously present centering elements.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of Switching Power Supply with overheat protector, it is characterised in that including：Input rectifying filter circuit, electric power management circuit,
Transformer circuit and output circuit, the transformer circuit include armature winding, secondary windings and assists winding, the output electricity
Road includes rectifying and wave-filtering sub-circuit and overheat protector sub-circuit；
The input of the input rectifying filter circuit is used to access civil power, the first output end of the input rectifying filter circuit
The armature winding first end is connected, the second output end of the input rectifying filter circuit connects the electric power management circuit
First input end；
Second input of the electric power management circuit connects the assists winding first end, the output of the electric power management circuit
The end connection end of armature winding second, the secondary windings first end connects the input of the rectifying and wave-filtering sub-circuit, institute
State the end of secondary windings second and the end of the assists winding second and be respectively used to ground connection；
The overheat protector sub-circuit includes relay K1, metal-oxide-semiconductor Q2, comparator U1, thermistor NTC2, resistance in parallel
R03 and electric capacity C02, resistance R04, the in-phase input end of electrochemical capacitor EC02 and voltage-stabiliser tube D03, the comparator U1 are by described
Thermistor NTC2 connects the output end of the rectifying and wave-filtering sub-circuit, and the in-phase input end of the comparator U1 is also connected with described
Resistance R03 in parallel and the first end of electric capacity C02, the inverting input of the comparator U1 connect institute by the resistance R04
The output end of rectifying and wave-filtering sub-circuit is stated, the inverting input of the comparator U1 is also respectively connected with the electrochemical capacitor EC02's
The negative electrode of positive pole and the voltage-stabiliser tube D03, the negative pole of the electrochemical capacitor EC02, the anode of the voltage-stabiliser tube D03 and described
Resistance R03 in parallel and second end of electric capacity C02 are respectively used to ground connection, and the output end of the comparator U1 connects the metal-oxide-semiconductor
The grid of Q2, the source electrode of the metal-oxide-semiconductor Q2 is used to be grounded, and the drain electrode of the metal-oxide-semiconductor Q2 is connected by the coil of the relay K1
The output end of the rectifying and wave-filtering sub-circuit is connect, switch one end of the relay K1 connects the defeated of the rectifying and wave-filtering sub-circuit
Go out end, the switch other end of the relay K1 is used to connect load.
2. Switching Power Supply as claimed in claim 1, it is characterised in that the output circuit also includes voltage stabilizing sub-circuit, described
Voltage stabilizing sub-circuit includes photoelectrical coupler U2, source of stable pressure U3, electric capacity C6, resistance R21, resistance R22, resistance R24, resistance in parallel
R25 and resistance R26；
The first input end of the photoelectrical coupler U2 connects the output of the rectifying and wave-filtering sub-circuit by the resistance R21
End, second input of the photoelectrical coupler U2 connects the power end of the source of stable pressure U3, and the of the photoelectrical coupler U2
Two inputs also order connects the output of the rectifying and wave-filtering sub-circuit by the electric capacity C6 for the connecting and resistance R24
End, first output end of the photoelectrical coupler U2 connects the 3rd input of the electric power management circuit, the photoelectric coupling
Second output end of device U2 is used to be grounded；
The reference voltage output terminal of the source of stable pressure U3 connects the series connection node of the electric capacity C6 and resistance R24, described steady
The reference voltage output terminal of potential source U3 is also connected with one end of the resistance R25 and resistance R26 of the parallel connection, the resistance in parallel
The earth terminal of the other end of R25 and resistance R26 and the source of stable pressure U3 is respectively used to ground connection.
3. Switching Power Supply as claimed in claim 1, it is characterised in that the input rectifying filter circuit includes what is be linked in sequence
First-level filtering marble circuit, secondary filter sub-circuit and rectifier bridge BD1, wherein the input of the first-level filtering marble circuit is used to connect
Enter civil power, the first output end of the first-level filtering marble circuit connects the assists winding first end and the secondary filter respectively
The first input end of sub-circuit, the second output end of the first-level filtering marble circuit is used as the of the input rectifying filter circuit
Two output ends, connect the second input of the first input end and the secondary filter sub-circuit of the electric power management circuit respectively
End；First output end of the rectifier bridge BD1 connects the primary as the first output end of the input rectifying filter circuit
Winding first end, second output end of the rectifier bridge BD1 is used to be grounded.
4. Switching Power Supply as claimed in claim 3, it is characterised in that the first-level filtering marble circuit include common mode inductance LF1,
Piezo-resistance MOV1 and electric capacity CX1；
The first input end of the common mode inductance LF1 is used to connect live wire, and second input of the common mode inductance LF1 is used to connect
Connecting to neutral line, first output end of the common mode inductance LF1 connects the first input end of the secondary filter sub-circuit, the common mode
Second output end of inductance LF1 connects the second input of the secondary filter sub-circuit；
The two ends of the piezo-resistance MOV1 connect first output end and the common mode inductance of the common mode inductance LF1 respectively
Second output end of LF1；
Two ends of the two ends of the electric capacity CX1 respectively with the piezo-resistance MOV1 are connected, and the two ends of the electric capacity CX1 are made respectively
It is first output end and the second output end of the first-level filtering marble circuit of the first-level filtering marble circuit.
5. Switching Power Supply as claimed in claim 4, it is characterised in that the first-level filtering marble circuit also includes the insurance of series connection
The first output end order of silk F2 and thermistor NTC1, the common mode inductance LF1 is by the fuse F2 and the temperature-sensitive
Resistance NTC1 connects one end of the electric capacity CX1 and the first input end of the secondary filter sub-circuit respectively.
6. Switching Power Supply as claimed in claim 4, it is characterised in that the Switching Power Supply also includes fuse F1, described common
The first input end of mould inductance LF1 is used to connect live wire by the fuse F1.
7. Switching Power Supply as claimed in claim 3, it is characterised in that the secondary filter sub-circuit includes common mode inductance LF2,
The first input end of the common mode inductance LF2 connects the first output end of the first-level filtering marble circuit, the common mode inductance LF2
The second input connect the second output end of the first-level filtering marble circuit, first output end of the common mode inductance LF2 connects
The first input end of the rectifier bridge is connect, second output end of the common mode inductance LF2 connects the second input of the rectifier bridge
End.
8. Switching Power Supply as claimed in claim 3, it is characterised in that the electric power management circuit includes power supply chip U1, core
Piece is powered sub-circuit, parallel resistance array, electric capacity C3, electric capacity C4, resistance R1, resistance R3, resistance R6, resistance R7 and switching tube
Q1；
The first input end of the chip power supply sub-circuit connects the second output end of the first-level filtering marble circuit, the chip
Second input of power supply sub-circuit connects the assists winding first end, the output end connection institute of the chip power supply sub-circuit
The VDD pins of power supply chip U1 are stated, the GATE pins of the power supply chip U1 connect the switching tube Q1 by the resistance R3
Grid, the SENSE pins of the power supply chip U1 connect the electric capacity C3 first ends, and the SENSE of the power supply chip U1 draws
Pin also connects the first end of the parallel resistance array, the second end of the parallel resistance array and the electric capacity by resistance R7
The ends of C3 second are respectively used to ground connection, the PRT pins of the power supply chip U1 by the resistance R1 connect respectively it is described be input into it is whole
The input and the assists winding first end of filter circuit are flowed, the PRT pins of the power supply chip U1 are additionally operable to by described
Resistance R33 is grounded, and the FB pins of the power supply chip U1 are used to be grounded by the resistance C4, the GND of the power supply chip U1
Pin is used to be grounded；
The drain electrode of the switching tube Q1 connects the end of armature winding second, the source electrode connection electricity in parallel of the switching tube Q1
The first end of array is hindered, the two ends of the resistance R6 connect the grid and source electrode of the switching tube Q1 respectively.
9. Switching Power Supply as claimed in claim 8, it is characterised in that the electric power management circuit also includes the resistance R5 of series connection
With diode D4, the negative electrode of the diode D4 connects the GATE pins of the power supply chip U1 by the resistance R5, described
The anode of diode D4 connects the grid of the switching tube Q1.
10. Switching Power Supply as claimed in claim 8, it is characterised in that the parallel resistance array includes order electricity in parallel
Resistance R8 to resistance R12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621404980.2U CN206250751U (en) | 2016-12-20 | 2016-12-20 | Switching Power Supply with overheat protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621404980.2U CN206250751U (en) | 2016-12-20 | 2016-12-20 | Switching Power Supply with overheat protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250751U true CN206250751U (en) | 2017-06-13 |
Family
ID=59007858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621404980.2U Expired - Fee Related CN206250751U (en) | 2016-12-20 | 2016-12-20 | Switching Power Supply with overheat protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206250751U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245051A (en) * | 2018-08-28 | 2019-01-18 | 出门问问信息科技有限公司 | A kind of supply convertor |
| CN109327012A (en) * | 2018-09-21 | 2019-02-12 | 郑州云海信息技术有限公司 | A kind of the protection circuit and server of mainboard |
| CN109980954A (en) * | 2019-04-15 | 2019-07-05 | 苏州沙丘电子科技有限公司 | Switching power circuit |
-
2016
- 2016-12-20 CN CN201621404980.2U patent/CN206250751U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245051A (en) * | 2018-08-28 | 2019-01-18 | 出门问问信息科技有限公司 | A kind of supply convertor |
| CN109327012A (en) * | 2018-09-21 | 2019-02-12 | 郑州云海信息技术有限公司 | A kind of the protection circuit and server of mainboard |
| CN109327012B (en) * | 2018-09-21 | 2020-03-31 | 郑州云海信息技术有限公司 | Protection circuit and server of mainboard |
| CN109980954A (en) * | 2019-04-15 | 2019-07-05 | 苏州沙丘电子科技有限公司 | Switching power circuit |
| CN109980954B (en) * | 2019-04-15 | 2020-07-14 | 苏州沙丘电子科技有限公司 | Switching power supply circuit |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170613 Termination date: 20181220 |