CN206250978U - Switching Power Supply with input undervoltage protection - Google Patents
Switching Power Supply with input undervoltage protection Download PDFInfo
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- CN206250978U CN206250978U CN201621370067.5U CN201621370067U CN206250978U CN 206250978 U CN206250978 U CN 206250978U CN 201621370067 U CN201621370067 U CN 201621370067U CN 206250978 U CN206250978 U CN 206250978U
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Abstract
The utility model proposes a kind of Switching Power Supply with input undervoltage protection, it includes：Input rectifying filter circuit, input undervoltage protection circuit, electric power management circuit, transformer circuit and output regulator rectifier circuit, input undervoltage protection circuit include a voltage detecting end and an output end.Wherein voltage detecting end is used for input ac voltage; the output end connection electric power management circuit of input undervoltage protection circuit; electric power management circuit connects the primary side of transformer circuit; when the voltage of transformer primary side is less than predetermined threshold value; input undervoltage protection circuit control electric power management circuit stops output, so that whole Switching Power Supply is stopped.The above-mentioned Switching Power Supply with input undervoltage protection, can provide input undervoltage and protects when chip is without input undervoltage defencive function by the input undervoltage protection circuit of chip periphery, extend the life-span of Switching Power Supply, the security of lifting switch power supply.
Description
Technical field
The utility model is related to power technique fields, more particularly to a kind of Switching Power Supply with input undervoltage protection.
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.In Switching Power Supply
In actual application, due to the unstable or other reasonses of externally fed power supply, Switching Power Supply may occur some exceptions, be
The various exceptions are avoided to cause damage the power device in Switching Power Supply, the power supply chip in general Switching Power Supply all can be integrated
Several defencive function.
However, for the design for simplifying power supply chip, convenient application, usual power supply chip only can integrated several less guarantors
Protective function, such as be all not integrated with input undervoltage defencive function in many power supply chips in the market.For employing this
For the Switching Power Supply of the not integrated input undervoltage defencive function of class, once power down suddenly or input voltage are too low in operation, it will
Power device in Switching Power Supply is caused damage, life-span and the security of Switching Power Supply is influenceed.
Utility model content
In view of this, it is necessary to a kind of Switching Power Supply with input undervoltage protection is provided, even if chip is without under-voltage guarantor
Protective function can also provide input undervoltage protection, extend the life-span of Switching Power Supply, improve security.
A kind of Switching Power Supply with input undervoltage protection, it is characterised in that including：Input rectifying filter circuit, input are owed
Voltage protection circuit, electric power management circuit, transformer circuit and output regulator rectifier 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 end and connect the input undervoltage protection circuit, the electric power management circuit and the transformer circuit respectively, the input is whole
Flowing the second output end of filter circuit is used to be grounded；
The input undervoltage protection circuit include first resistor string RS1, second resistance string RS2, electric capacity C21, electric capacity C22,
One end of triode Q1 and triode Q2, the first resistor string RS1 are used for input ac voltage, the first resistor string RS1
The other end be used for be grounded, the node in the first resistor string RS1 connects one end and described three of the electric capacity C22 respectively
The emitter stage of the base stage of pole pipe Q1, the other end of the electric capacity C22 and the triode Q1 is respectively used to ground connection, the triode
The colelctor electrode of Q1 connects the first output end of the input rectifying filter circuit, three pole by the second resistance string RS2
The colelctor electrode of pipe Q1 is also respectively connected with one end of the electric capacity C21 and the base stage of the triode Q2, and the electric capacity C21's is another
The emitter stage of end and the triode Q2 is respectively used to ground connection, the electricity after the colelctor electrode connection rectifying and wave-filtering of the triode Q2
Road；
The transformer circuit includes transformer and resistance R15, and the transformer includes armature winding, secondary windings and auxiliary
Help winding, the armature winding first end connects the first output end of the input rectifying filter circuit, the armature winding the
Two ends connect the output end of the electric power management circuit, and the assists winding first end connects the current collection of the triode Q2 respectively
Pole and the power input of the electric power management circuit, the assists winding first end also connect described by the resistance R15
The pressure feedback port of electric power management circuit, the end of the assists winding second is used to be grounded, and the two ends of the secondary windings connect respectively
Two inputs of the output regulator rectifier circuit are connect, the output end of the output regulator rectifier circuit is used to connect load.
Wherein in one embodiment, the first resistor string includes resistance R21, the resistance R22 and resistance R23 of series connection,
The connecting node of the resistance R22 and the resistance R23 connects one end of the electric capacity C21 and the base of the triode Q1 respectively
Pole.
Wherein in one embodiment, second resistance string includes the resistance R24 and resistance R25 of series connection.
Wherein in one embodiment, the triode Q2 is Darlington transistor.
Wherein in one embodiment, the electric power management circuit includes power management chip U1, resistance R8, the electricity of series connection
Resistance R9 and resistance R10, resistance R16, resistance R17, resistance R18 and resistance R19, electric capacity C4, electric capacity C5, electric capacity C6, electricity in parallel
Hold C7, diode D5 and diode D6, wherein：
The power input pin of the power management chip U1 connects described by the resistance R9 and resistance R10 of the series connection
First output end of input rectifying filter circuit, the power input pin of the power management chip U1 is also respectively connected with described two
One end of the negative electrode of pole pipe D5 and the electric capacity C7, the other end of the electric capacity C7 is used to be grounded；
The anode of the diode D5 connects the negative electrode of the diode D6 and three pole respectively by the resistance R8
The colelctor electrode of pipe Q2, the anode of the diode D6 connects the assists winding first end, and the anode of the diode D6 also leads to
Cross the Voltage Feedback pin that the resistance R15 connects the power management chip U1；
The Voltage Feedback pin of the power management chip U1 connects one end of the resistance R16, the resistance R17 respectively
One end and the electric capacity C5 one end, the other end of the resistance R16, the other end of the resistance R17 and the electric capacity C5
The other end be respectively used to ground connection；
The current detecting pin connection resistance R18 in parallel of the power management chip U1 and resistance R19 one end, institute
Stating the resistance R18 and the resistance R19 other ends of parallel connection is used to be grounded.
Wherein in one embodiment, the transformer circuit also includes resistance R11 and resistance R12, resistance in parallel
R13, resistance R14, diode D7 and electric capacity C3, wherein：
The resistance R11 in parallel and resistance R12 one end connect the first output end of the input rectifying filter circuit, institute
State parallel connection resistance R11 and the resistance R12 other ends pass sequentially through series connection the resistance R13 and the electric capacity C3 connection it is described just
Level winding first end, the resistance R11 in parallel and the resistance R12 other ends also connect the diode by the resistance R14
The negative electrode of D7, the anode of the diode D7 connects the defeated of the end of the armature winding second and the power management chip U1 respectively
Go out pin.
Wherein in one embodiment, the input rectifying filter circuit include rectifier bridge BD1, electric capacity C1, resistance R1, altogether
Mould inductance LF1 and electric capacity C2, wherein：
The first input end of the rectifier bridge BD1 is used to connect live wire, and second input of the rectifier bridge BD1 is used to connect
Connecting to neutral line, first output end of the rectifier bridge BD1 connects the first input end of the common mode inductance LF1, the rectifier bridge BD1
The second output end connect second input of the common mode inductance LF1；
First output end of the common mode inductance LF1 is distinguished as the first output end of the input rectifying filter circuit
The input undervoltage protection circuit and the transformer circuit are connected, second output end of the common mode inductance LF1 is used to be grounded；
The two ends of the electric capacity C1 connect respectively the rectifier bridge BD1 the first output end and the rectifier bridge BD1
Two output ends；
The two ends of the resistance R1 connect the first input end and the common mode inductance LF1 of the common mode inductance LF1 respectively
The first output end；
The two ends of the electric capacity C2 connect first output end and the common mode inductance LF1 of the common mode inductance LF1 respectively
The second output end.
Wherein in one embodiment, the Switching Power Supply also includes fuse FR1, and the first of the rectifier bridge BD1 is defeated
Enter end for connecting live wire by the fuse FR1.
Wherein in one embodiment, the output regulator rectifier circuit includes：Resistance R20, resistance R21, electric capacity C10,
Electric capacity C11, electric capacity C12, diode D8, diode D9, voltage-stabiliser tube ZD2 and inductance L1, wherein：
The diode D8 and diode D9 are in parallel in the same direction, and its anode in parallel connects the secondary windings first end, and it is simultaneously
Connection negative electrode connects one end of the electric capacity C11 and one end of the inductance L1, and the other end of the inductance L1 is used as the output
The positive output end of regulator rectifier circuit, for connecting load positive pole, the other end of the electric capacity C11 is steady as the output rectification
The negative output terminal of volt circuit, for being grounded and connecting load negative pole；
The negative electrode of the voltage-stabiliser tube ZD2 connects the other end of the inductance L1, and the anode connection of the voltage-stabiliser tube ZD2 is described
The other end of electric capacity C11, the electric capacity C12 and the resistance R21 are in parallel with the voltage-stabiliser tube ZD2 respectively.
Wherein in one embodiment, the electric capacity C11 and electric capacity C12 is electrochemical capacitor, and the electric capacity C11 is just
Pole connects the negative electrode in parallel, and the negative pole of the electric capacity C11 is used to be grounded；The positive pole of the electric capacity C12 connects the inductance L1
The other end, the negative pole of the electric capacity C12 is used to be grounded.
The above-mentioned Switching Power Supply with input undervoltage protection, input undervoltage protection electricity is provided with power management chip periphery
Road, once it is too low to detect input voltage, can quickly control power management chip to be stopped, to prevent the work(in Switching Power Supply
Rate device is damaged, so that extend the life-span of Switching Power Supply, the security of lifting switch power supply.Because input undervoltage protects electricity
Road is arranged on chip periphery, even if using the chip without input undervoltage defencive function, the Switching Power Supply can also provide input
Under-voltage protection.In addition the input undervoltage protection circuit element is less, circuit structure is simple, protecting effect is good without excessive increase
Industrial cost, 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 input undervoltage protection of an embodiment；
Fig. 2 is the circuit diagram of the Switching Power Supply with input undervoltage protection of an embodiment.
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 protected with input undervoltage according to the utility model embodiment is described below in conjunction with the accompanying drawings.For example,
The Switching Power Supply with input undervoltage protection of the embodiment of the utility model one includes：The input of input rectifying filter circuit is used for
Access civil power, the first output end of input rectifying filter circuit connect respectively input undervoltage protection circuit, electric power management circuit and
Transformer circuit, the second output end of input rectifying filter circuit is used to be grounded；Input undervoltage protection circuit includes first resistor
Use string RS1, second resistance string RS2, electric capacity C21, electric capacity C22, triode Q1 and triode Q2, one end of first resistor string RS1
In connection live wire, the other end of first resistor string RS1 is used to be grounded, and the node in first resistor string RS1 connects electric capacity respectively
One end of C22 and the base stage of triode Q1, the other end of electric capacity C22 and the emitter stage of triode Q1 are respectively used to ground connection, three poles
The colelctor electrode of pipe Q1 connects the first output end of input rectifying filter circuit, the current collection of triode Q1 by second resistance string RS2
Pole is also respectively connected with one end of electric capacity C21 and the base stage of triode Q2, the other end of electric capacity C21 and the emitter stage of triode Q2 point
Yong Yu not be grounded, the colelctor electrode connection transformer circuit of triode Q2；Transformer circuit includes transformer and resistance R15, transformation
Device includes armature winding, secondary windings and assists winding, and the first of armature winding first end connection input rectifying filter circuit is defeated
Go out end, the end of armature winding second connects the output end of electric power management circuit, assists winding first end difference connecting triode Q2's
The power input of colelctor electrode and electric power management circuit, assists winding first end also connects electric power management circuit by resistance R15
Pressure feedback port, the end of assists winding second is used to be grounded, and the two ends of secondary windings connect output regulator rectifier circuit respectively
Two inputs, exporting the output end of regulator rectifier circuit is used to connect load.
For example, as shown in figure 1, an embodiment with input undervoltage protection Switching Power Supply 10, including：Input rectifying is filtered
Circuit 11, input undervoltage protection circuit 12, electric power management circuit 13, transformer circuit 14 and output regulator rectifier circuit 15, its
The input of middle input rectifying filter circuit is used to access civil power, and such as input rectifying filter circuit includes two inputs, point
Live wire and zero line Yong Yu not connected.First output end of input rectifying filter circuit connects input undervoltage protection circuit, electricity respectively
The primary side of power management circuits and transformer circuit, the second output end of input rectifying filter circuit is used to be grounded, for example for
By chassics earth, and for example, Switching Power Supply also includes casing, and the casing is used to pass through a capacity earth.Input rectifying filtered electrical
Road is used to carry out rectifying and wave-filtering treatment to the civil power being input into, and civil power is converted into direct current.
Input undervoltage protection circuit includes two voltage detecting ends and an output end.A wherein voltage detecting end is used to connect fire
Line, another voltage detecting end connects the first output end of input rectifying filter circuit, and the output end of input undervoltage protection circuit connects
Electric power management circuit is connect, for example, connects the power input pin of power management chip in electric power management circuit.Specifically, it is input into and owes
Voltage protection circuit includes first resistor string RS1, second resistance string RS2, electric capacity C21, electric capacity C22, triode Q1 and triode Q2,
One end of first resistor string RS1 is used for input ac voltage, such as, for connecting live wire, the other end of first resistor string RS1 is used
A node in ground connection, first resistor string RS1 connects one end of electric capacity C22 and the base stage of triode Q1 respectively, electric capacity C22's
The emitter stage of the other end and triode Q1 is respectively used to ground connection, and the colelctor electrode of triode Q1 connects defeated by second resistance string RS2
Enter the first output end of current rectifying and wave filtering circuit, the colelctor electrode of triode Q1 is also respectively connected with one end and the triode Q2 of electric capacity C21
Base stage, the other end of electric capacity C21 and the emitter stage of triode Q2 are respectively used to ground connection, the colelctor electrode connection rectification of triode Q2
Filtered circuit, such as colelctor electrode of triode Q2 connect transformer circuit and electric power management circuit respectively.Input undervoltage is protected
The voltage that protection circuit is used for transformer primary side is detected, such as respectively to the defeated of line voltage and input rectifying filter circuit
Go out voltage to be detected, when the voltage of transformer primary side is less than predetermined threshold value, input undervoltage protection circuit is to power management
Circuit sends control signal, electric power management circuit is stopped output, so that whole Switching Power Supply is stopped, it is split to realize
The protection in powered-down source.
For example, above-mentioned first resistor string includes the resistance of at least two series connection.For example, as shown in Fig. 2 above-mentioned first resistor
String includes that resistance R21, the resistance R22 of series connection and one end of resistance R23, resistance R21 are used to connect live wire, and resistance R21's is another
Hold for being grounded by resistance R22 and resistance R23, the connecting node of resistance R22 and resistance R23 connects the one of electric capacity C21 respectively
End and the base stage of triode Q1.
In one embodiment, as shown in Fig. 2 second resistance string includes the resistance R24 and resistance R25 of series connection.
Specifically, it is that the base stage of triode Q1 is powered after line voltage is through first resistor string partial pressure, when generation input undervoltage
When abnormal, i.e., when line voltage is less than predetermined threshold value, triode Q1 is ended due to base voltage less than conducting voltage, is input into whole
The DC voltage for flowing the first output end output of filter circuit is charged by resistance R24 and resistance R25 to electric capacity C21, works as electric capacity
During the conducting voltage higher than triode Q2 of C21 both end voltages, triode Q2 conductings so that the power input of electric power management circuit
Terminal voltage is pulled low, and electric power management circuit stops output.When the line voltage of input is normal, triode Q1 conductings, electric capacity C21
Both end voltage is 0V, and Q2 ends, and electric power management circuit can obtain normal power supply, so that normal work.
Wherein, it is above-mentioned pre- to adjust or set by adjusting the quantity of resistance in first resistor string and the resistance of each resistance
If threshold value.Above-mentioned predetermined threshold value should be less than the normal input voltage of Switching Power Supply, for example, above-mentioned predetermined threshold value is 85V, and for example,
Above-mentioned predetermined threshold value is 70V.
For example, as shown in figure 1, the triode Q2 be Darlington transistor, wherein, the Darlington transistor have two
Individual triode, including the first triode and the second triode, the base stage of the first triode connect the colelctor electrode of the triode Q1,
The colelctor electrode of the first triode connects the colelctor electrode of the second triode, and the emitter stage of the first triode connects the base of the second triode
Pole, the emitter stage of the second triode is used to be grounded, and the colelctor electrode of the second triode is also connected with the assists winding first end and institute
State the power input of electric power management circuit；And for example, as shown in figure 1, the Switching Power Supply also includes electric capacity YC1, the input
Second output end of current rectifying and wave filtering circuit, the other end of the first resistor string RS1, the other end of the electric capacity C22, described three
The emitter stage of pole pipe Q1, the other end of the electric capacity C21, the emitter stage of the triode Q2 and the assists winding second
End is used to be grounded by electric capacity YC1, i.e., the second output end of described input rectifying filter circuit, the first resistor string RS1
The other end, the other end of the electric capacity C22, the emitter stage of the triode Q1, the other end of the electric capacity C21, described three
The emitter stage of pole pipe Q2 and the end of the assists winding second are all connected with one end of electric capacity YC1, and the other end of electric capacity YC1 is used for
Ground connection.
For example, transformer circuit includes transformer and resistance R15, transformer includes armature winding, secondary windings and auxiliary
Winding, armature winding first end connects the first output end of input rectifying filter circuit, the end of armature winding second connection power supply pipe
Manage the output end of circuit, the colelctor electrode of assists winding first end difference connecting triode Q2 and the power input of electric power management circuit
End, assists winding first end is additionally operable to be connected by resistance R15 the pressure feedback port of electric power management circuit, the end of assists winding second
For being grounded, the two ends of secondary windings connect two inputs of output regulator rectifier circuit respectively, export regulator rectifier circuit
Output end be used for connect load.
In the present embodiment, assists winding is used to be powered for electric power management circuit.Current rectifying and wave filtering circuit is used for transformer
The induced voltage of secondary windings carries out the treatment such as rectification, voltage stabilizing, filtering, the direct-flow output signal stablized, so as to direct current
Load supplying.
The above-mentioned Switching Power Supply with input undervoltage protection, input undervoltage protection electricity is provided with power management chip periphery
Road, once it is too low to detect input voltage, can quickly control power management chip to be stopped, to prevent the work(in Switching Power Supply
Rate device is damaged, so that extend the life-span of Switching Power Supply, the security of lifting switch power supply.Because input undervoltage protects electricity
Road is arranged on chip periphery, even if using the chip without input undervoltage defencive function, the Switching Power Supply can also provide input
Under-voltage protection.In addition the input undervoltage protection circuit element is less, circuit structure is simple, protecting effect is good without excessive increase
Industrial cost, with stronger practicality.
Wherein in one embodiment, as shown in Fig. 2 electric power management circuit includes power management chip U1, resistance R8, string
The resistance R9 and resistance R10 of connection, resistance R16, resistance R17, resistance R18 and resistance R19, electric capacity C4, electric capacity C5, electric capacity in parallel
C6, electric capacity C7, diode D5 and diode D6, wherein：The resistance that the power input pin of power management chip U1 passes through series connection
R9 and resistance R10 connects the first output end of input rectifying filter circuit, and the power input pin of power management chip U1 is also divided
Not Lian Jie diode D5 negative electrode and one end of electric capacity C7, the other end of electric capacity C7 is used to be grounded；The anode of diode D5 passes through
Resistance R8 connects the negative electrode of diode D6 and the colelctor electrode of triode Q2, the anode connection assists winding first of diode D6 respectively
End, the anode of diode D6 also connects the Voltage Feedback pin of power management chip U1 by resistance R15；Power management chip U1
Voltage Feedback pin connect one end of one end of resistance R16, one end of resistance R17 and electric capacity C5 respectively, resistance R16's is another
The other end of end, the other end of resistance R17 and electric capacity C5 is respectively used to ground connection；The current detecting pin of power management chip U1 connects
Resistance R18 and resistance R19 one end of parallel connection are connect, resistance R18 in parallel and the resistance R19 other ends are used to be grounded.
Wherein, electric capacity C5, electric capacity C6 and electric capacity C7 are respectively used to filtering.For example, in order to strengthen filter effect, electric capacity C7 is adopted
With electrochemical capacitor, the power input pin of the positive pole connection power management chip U1 of electrochemical capacitor C7, the negative pole of electrochemical capacitor C7
For being grounded.
Wherein in one embodiment, as shown in Fig. 2 transformer circuit also include in parallel resistance R11 and resistance R12,
Resistance R13, resistance R14, diode D7 and electric capacity C3, wherein：Resistance R11 in parallel and resistance R12 one end connection input rectifying
First output end of filter circuit, resistance R11 and the resistance R12 other ends in parallel passes sequentially through the resistance R13 and electric capacity of series connection
C3 connects armature winding first end, and resistance R11 in parallel and the resistance R12 other ends also connect diode D7's by resistance R14
Negative electrode, the anode of diode D7 connects the output pin of the end of armature winding second and power management chip U1 respectively.
Wherein in one embodiment, as shown in Fig. 2 input rectifying filter circuit includes rectifier bridge BD1, electric capacity C1, electricity
Resistance R1, common mode inductance LF1 and electric capacity C2, wherein：The first input end of rectifier bridge BD1 is used to connect live wire, and the of rectifier bridge BD1
Two inputs are used to connect zero line, the first input end of the first output end connection common mode inductance LF1 of rectifier bridge BD1, rectifier bridge
Second input of the second output end connection common mode inductance LF1 of BD1；First output end of common mode inductance LF1 is whole as being input into
The first output end of filter circuit is flowed, input undervoltage protection circuit and transformer circuit, the second of common mode inductance LF1 are connected respectively
Output end is used to be grounded；The two ends of electric capacity C1 connect the second output of first output end and rectifier bridge BD1 of rectifier bridge BD1 respectively
End；Distinguish the first input end of common mode inductance LF1 and first output end of common mode inductance LF1 in the two ends of resistance R1；Electric capacity C2's
Two ends connect first output end of common mode inductance LF1 and second output end of common mode inductance LF1 respectively.
For example, common mode inductance LF1 includes first coil and the second coil, the first input end of common mode inductance LF1 and second
Input is respectively one end of first coil and one end of the second coil, first output end of common mode inductance LF1 and the second output
End is respectively the other end of first coil and the other end of the second coil.
And for example, in order to strengthen filter effect, electric capacity C1 and electric capacity C2 is respectively adopted electrochemical capacitor, the positive pole of electrochemical capacitor C1
First output end of connection rectifier bridge BD1, the positive pole of electrochemical capacitor C2 connects first output of rectifier bridge BD1 by resistance R1
End, the negative pole of electrochemical capacitor C1 and electrochemical capacitor C2 is respectively used to ground connection.
Wherein in one embodiment, as shown in Fig. 2 for the security of further lifting switch power supply, above-mentioned switch
Power supply also includes fuse FR1, and the first input end of rectifier bridge BD1 is used to connect live wire by fuse FR1.So, if opening
The input side in powered-down source is short-circuited or other exceptions so that when Switching Power Supply input side temperature is too high, fuse FR1 fusing,
So that whole Switching Power Supply power-off, to avoid the occurrence of security incident.
Wherein in one embodiment, as shown in Fig. 2 output regulator rectifier circuit includes：Resistance R20, resistance R21, electricity
Hold C10, electric capacity C11, electric capacity C12, diode D8, diode D9, voltage-stabiliser tube ZD2 and inductance L1, wherein：Diode D8 and two poles
Pipe D9 is in parallel in the same direction, and its anode connection secondary windings first end in parallel, its negative electrode in parallel connects one end and the inductance L1 of electric capacity C11
One end, the other end of inductance L1 as output regulator rectifier circuit positive output end, for connecting load positive pole, electric capacity C11
The other end as output regulator rectifier circuit negative output terminal, for being grounded and connecting load negative pole；The negative electrode of voltage-stabiliser tube ZD2
The other end of connection inductance L1, the other end of the anode connection electric capacity C11 of voltage-stabiliser tube ZD2, electric capacity C12 and resistance R21 respectively with
Voltage-stabiliser tube ZD2 is in parallel.For example, electric capacity C11 and electric capacity C12 is electrochemical capacitor, the positive pole connection negative electrode in parallel of electric capacity C11, electric capacity
The negative pole of C11 is used to be grounded；The other end of the positive pole connection inductance L1 of electric capacity C12, the negative pole of electric capacity C12 is used to be grounded.
For example, in order to strengthen filter effect, electric capacity C11 and electric capacity C12 is respectively adopted electrochemical capacitor, electrochemical capacitor C11's
Positive pole connects the negative electrode in parallel, the other end of the positive pole connection inductance L1 of electrochemical capacitor C12, electrochemical capacitor C11 and electrolysis electricity
The negative pole for holding C12 is respectively used to ground connection.For example, the negative pole of electrochemical capacitor C11 and electrochemical capacitor C12 is the negative of above-mentioned Switching Power Supply
Output end, the negative pole for connecting load.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
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. it is a kind of with input undervoltage protection Switching Power Supply, it is characterised in that including：Input rectifying filter circuit, input undervoltage
Protection circuit, electric power management circuit, transformer circuit and output regulator rectifier 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 input undervoltage protection circuit, the electric power management circuit and the transformer circuit, the input rectifying filter are connected respectively
Second output end of wave circuit is used to be grounded；
The input undervoltage protection circuit includes first resistor string RS1, second resistance string RS2, electric capacity C21, electric capacity C22, three poles
One end of pipe Q1 and triode Q2, the first resistor string RS1 are used for input ac voltage, and the first resistor string RS1's is another
One end is used to be grounded, and the node in the first resistor string RS1 connects one end of the electric capacity C22 and the triode respectively
The emitter stage of the base stage of Q1, the other end of the electric capacity C22 and the triode Q1 is respectively used to ground connection, the triode Q1's
Colelctor electrode connects the first output end of the input rectifying filter circuit, the triode Q1 by the second resistance string RS2
Colelctor electrode be also respectively connected with one end of the electric capacity C21 and the base stage of the triode Q2, the other end of the electric capacity C21 and
The emitter stage of the triode Q2 is respectively used to ground connection, the circuit after the colelctor electrode connection rectifying and wave-filtering of the triode Q2；
The transformer circuit include transformer and resistance R15, the transformer include armature winding, secondary windings and auxiliary around
Group, the armature winding first end connects the first output end of the input rectifying filter circuit, the end of the armature winding second
Connect the output end of the electric power management circuit, the assists winding first end connect respectively the triode Q2 colelctor electrode and
The power input of the electric power management circuit, the assists winding first end also connects the power supply by the resistance R15
The pressure feedback port of circuit is managed, the end of the assists winding second is used to be grounded, and the two ends of the secondary windings connect institute respectively
Two inputs of output regulator rectifier circuit are stated, the output end of the output regulator rectifier circuit is used to connect load.
2. Switching Power Supply as claimed in claim 1, it is characterised in that the first resistor string includes resistance R21, the electricity of series connection
Resistance R22 and resistance R23, the resistance R22 and the resistance R23 connecting node connect respectively the electric capacity C21 one end and
The base stage of the triode Q1.
3. Switching Power Supply as claimed in claim 1, it is characterised in that second resistance string includes the resistance R24 and resistance of series connection
R25。
4. Switching Power Supply as claimed in claim 1, it is characterised in that the triode Q2 is Darlington transistor.
5. Switching Power Supply as claimed in claim 1, it is characterised in that the electric power management circuit includes power management chip
U1, resistance R8, the resistance R9 of series connection and resistance R10, resistance R16, resistance R17, resistance R18 and resistance R19, electric capacity in parallel
C4, electric capacity C5, electric capacity C6, electric capacity C7, diode D5 and diode D6, wherein：
The power input pin of the power management chip U1 connects the input by the resistance R9 and resistance R10 of the series connection
First output end of current rectifying and wave filtering circuit, the power input pin of the power management chip U1 is also respectively connected with the diode
One end of the negative electrode of D5 and the electric capacity C7, the other end of the electric capacity C7 is used to be grounded；
The anode of the diode D5 connects the negative electrode and the triode Q2 of the diode D6 by the resistance R8 respectively
Colelctor electrode, the anode of the diode D6 connects the assists winding first end, and the anode of the diode D6 also passes through institute
State the Voltage Feedback pin that resistance R15 connects the power management chip U1；
The Voltage Feedback pin of the power management chip U1 connects one end of the resistance R16, the one of the resistance R17 respectively
End and one end of the electric capacity C5, the other end of the resistance R16, the other end of the resistance R17 and the electric capacity C5's is another
One end is respectively used to ground connection；
The current detecting pin connection resistance R18 in parallel of the power management chip U1 and resistance R19 one end, it is described simultaneously
Resistance R18 and resistance the R19 other end of connection are used to be grounded.
6. Switching Power Supply as claimed in claim 1, it is characterised in that the transformer circuit also includes resistance R11 in parallel
With resistance R12, resistance R13, resistance R14, diode D7 and electric capacity C3, wherein：
The resistance R11 in parallel and resistance R12 one end connect the first output end of the input rectifying filter circuit, it is described simultaneously
The resistance R11 and the resistance R12 other ends of connection pass sequentially through series connection the resistance R13 and the electric capacity C3 connection it is described it is primary around
Group first end, the resistance R11 in parallel and the resistance R12 other ends also connect the diode D7's by the resistance R14
Negative electrode, the output that the anode of the diode D7 connects the end of the armature winding second and the power management chip U1 respectively is drawn
Pin.
7. Switching Power Supply as claimed in claim 1, it is characterised in that the input rectifying filter circuit include rectifier bridge BD1,
Electric capacity C1, resistance R1, common mode inductance LF1 and electric capacity C2, wherein：
The first input end of the rectifier bridge BD1 is used to connect live wire, and second input of the rectifier bridge BD1 is used to connect zero
Line, first output end of the rectifier bridge BD1 connects the first input end of the common mode inductance LF1, and the of the rectifier bridge BD1
Two output ends connect second input of the common mode inductance LF1；
First output end of the common mode inductance LF1 is connected respectively as the first output end of the input rectifying filter circuit
The input undervoltage protection circuit and the transformer circuit, second output end of the common mode inductance LF1 are used to be grounded；
The two ends of the electric capacity C1 connect respectively the rectifier bridge BD1 the first output end and the rectifier bridge BD1 it is second defeated
Go out end；
The two ends of the resistance R1 connect respectively the common mode inductance LF1 first input end and the common mode inductance LF1
One output end；
The two ends of the electric capacity C2 connect respectively the common mode inductance LF1 the first output end and the common mode inductance LF1
Two output ends.
8. Switching Power Supply as claimed in claim 7, it is characterised in that the Switching Power Supply also includes fuse FR1, described whole
The first input end of stream bridge BD1 is used to connect live wire by the fuse FR1.
9. Switching Power Supply as claimed in claim 1, it is characterised in that the output regulator rectifier circuit includes：Resistance R20,
Resistance R21, electric capacity C10, electric capacity C11, electric capacity C12, diode D8, diode D9, voltage-stabiliser tube ZD2 and inductance L1, wherein：
The diode D8 and diode D9 are in parallel in the same direction, and its anode in parallel connects the secondary windings first end, and it is in parallel cloudy
Pole connects one end of the electric capacity C11 and one end of the inductance L1, and the other end of the inductance L1 is used as the output rectification
The positive output end of mu balanced circuit, for connecting load positive pole, the other end of the electric capacity C11 is used as the output rectifying and voltage-stabilizing electricity
The negative output terminal on road, for being grounded and connecting load negative pole；
The negative electrode of the voltage-stabiliser tube ZD2 connects the other end of the inductance L1, and the anode of the voltage-stabiliser tube ZD2 connects the electric capacity
The other end of C11, the electric capacity C12 and the resistance R21 are in parallel with the voltage-stabiliser tube ZD2 respectively.
10. Switching Power Supply as claimed in claim 9, it is characterised in that the electric capacity C11 and electric capacity C12 is electrolysis electricity
Hold, the positive pole of the electric capacity C11 connects the negative electrode in parallel, and the negative pole of the electric capacity C11 is used to be grounded；The electric capacity C12's
Positive pole connects the other end of the inductance L1, and the negative pole of the electric capacity C12 is used to be grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621370067.5U CN206250978U (en) | 2016-12-13 | 2016-12-13 | Switching Power Supply with input undervoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621370067.5U CN206250978U (en) | 2016-12-13 | 2016-12-13 | Switching Power Supply with input undervoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250978U true CN206250978U (en) | 2017-06-13 |
Family
ID=59007396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621370067.5U Expired - Fee Related CN206250978U (en) | 2016-12-13 | 2016-12-13 | Switching Power Supply with input undervoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206250978U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108365756A (en) * | 2018-03-23 | 2018-08-03 | 佛山德仁照明科技有限公司 | A kind of Switching Power Supply |
| CN108712088A (en) * | 2018-06-13 | 2018-10-26 | 深圳市海蕴新能源有限公司 | A kind of switching power circuit inhibiting EFT harassing and wrecking |
| CN109417351A (en) * | 2017-09-19 | 2019-03-01 | 深圳配天智能技术研究院有限公司 | A kind of servo-driver Switching Power Supply and servo-driver |
| CN113629692A (en) * | 2020-05-09 | 2021-11-09 | 山东亚华电子股份有限公司 | Power supply circuit |
-
2016
- 2016-12-13 CN CN201621370067.5U patent/CN206250978U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417351A (en) * | 2017-09-19 | 2019-03-01 | 深圳配天智能技术研究院有限公司 | A kind of servo-driver Switching Power Supply and servo-driver |
| CN108365756A (en) * | 2018-03-23 | 2018-08-03 | 佛山德仁照明科技有限公司 | A kind of Switching Power Supply |
| CN108712088A (en) * | 2018-06-13 | 2018-10-26 | 深圳市海蕴新能源有限公司 | A kind of switching power circuit inhibiting EFT harassing and wrecking |
| CN113629692A (en) * | 2020-05-09 | 2021-11-09 | 山东亚华电子股份有限公司 | Power supply circuit |
| CN113629692B (en) * | 2020-05-09 | 2023-10-27 | 山东亚华电子股份有限公司 | Power supply circuit |
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