CN205753993U - Switching Power Supply and electronic installation - Google Patents
Switching Power Supply and electronic installation Download PDFInfo
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- CN205753993U CN205753993U CN201620221801.5U CN201620221801U CN205753993U CN 205753993 U CN205753993 U CN 205753993U CN 201620221801 U CN201620221801 U CN 201620221801U CN 205753993 U CN205753993 U CN 205753993U
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Abstract
The utility model discloses a kind of Switching Power Supply and electronic installation, this Switching Power Supply includes power supply processing circuit and feedback control circuit, power supply processing circuit has the power supply output loop for powering load, power supply output loop is provided with power control switching, feedback control circuit includes feedback control module, control module, memory module and current detection module, the input of feedback control module and the test side of detection module are connected on power supply output loop, the outfan of feedback control module is connected with the feedback reception end of power supply processing circuit, the end that is adjusted of feedback control module is connected with the signal output part of control module and the outfan of memory module；The signal input part of control module is connected with the signal output part of detection module.This utility model solve Switching Power Supply carry out power control time, the technical problem that current constant control effect is poor, improve the reliability of Switching Power Supply.
Description
Technical field
This utility model relates to switch power technology field, particularly relates to a kind of Switching Power Supply and electronic installation.
Background technology
Existing Switching Power Supply is mainly processed part by power supply transformation and feedback fraction forms.Wherein, power supply transformation processes
After input power carries out transformation, rectification, filtering, output is to load, for loaded work piece for part；Feedback fraction is for anti-
The output voltage of feedback load processes part to power supply transformation, and changes the output frequency (PFM) of power supply transformation process part or account for
Empty ratio (PWM), so that its output is to the voltage constant of load.
As it is shown in figure 1, in existing this switching power circuit, it is often necessary to load is carried out current constant control and power
Control.Wherein, current constant control is to be gathered by feedback circuit and feed back the voltage on the sampling resistor being serially connected in load circuit
Fall, the voltage that feedback circuit takes on this sampling resistor does feedback control signal so that flow through the current constant of load.Then, exist
While current constant control, the power of load is controlled, as it is shown in figure 1, access power controls switch in the loop, by controlling
The duty cycle of switching of device output power Signal-controlled switch, thus control the power of load.But, bring the most again
New problem, when power control switching disconnects, sampling resistor both end voltage is zero, power supply transformation process portion after feedback control
The voltage dividing output can rise, and when power control switching is again turned on, the electric current flowing through load will exceed the predetermined of constant current
Value so that constant current degradation.
From the foregoing, it will be observed that existing this Switching Power Supply is when realizing power and controlling, current constant control effect is poor, Switching Power Supply
Reliability poor.
Utility model content
Main purpose of the present utility model is to provide a kind of Switching Power Supply, it is intended to solves Switching Power Supply and is carrying out power control
Time processed, the technical problem that current constant control effect is poor, improves the reliability of Switching Power Supply.
For achieving the above object, the utility model proposes a kind of Switching Power Supply, this Switching Power Supply includes power supply processing circuit
And feedback control circuit, described power supply processing circuit has the power supply output loop for powering load, and described power supply exports
Loop is provided with power control switching, described feedback control circuit include feedback control module, control module, memory module and
Current detection module, the input of described feedback control module and the test side of described detection module are connected to described power supply
On output loop, the outfan of described feedback control module is connected with the feedback reception end of described power supply processing circuit, described instead
The end that is adjusted of feedback control module is connected with the outfan of the signal output part of described control module and described memory module；Described
The signal input part of control module is connected with the signal output part of described detection module；Wherein,
Described feedback control module, for detecting the size of current of described power supply output loop, and according to the electricity detected
Stream size exports corresponding voltage feedback signal, to control the output electric current of described power supply processing circuit；
Described detection module, for the electric current of described power supply output loop is detected, and output detections signal；
Described control module, the size of the detection signal for exporting according to described detection module adjusts described feedback accordingly
The size of the voltage feedback signal of control module output；
Described memory module, before turning off in described power control switching, remembers the input of described feedback control module
Voltage, so that described feedback control module keeps exporting described voltage feedback signal.
Preferably, described feedback control module include first voltage stabilizing adjust pipe, optocoupler, the first resistance, the second resistance, first
Electric capacity, the 3rd resistance, the 4th resistance and the 5th resistance, the first end of described 3rd resistance, the first end of described 4th resistance, institute
State the first end of the 5th resistance, described first voltage stabilizing adjusts the adjustment end of pipe and the first end interconnection of described second resistance, described
The input that second end is described feedback control module of the 3rd resistance, the second end ground connection of described 4th resistance, the described 5th
Second end of resistance is the end that is adjusted of described feedback control module, and described first voltage stabilizing adjusts the plus earth of pipe, described the
One voltage stabilizing adjusts the negative electrode of pipe and is connected with the input of described optocoupler through described first resistance, the second end warp of described second resistance
Described first electric capacity is connected with the common port of negative electrode and described first resistance that described first voltage stabilizing adjusts pipe；Described optocoupler defeated
Go out the end outfan for described feedback control module.
Preferably, described detection module includes the first DC source, power reference source, comparator, the second electric capacity, the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the 9th resistance and the first sampling resistor, described first sampling resistor is connected to described power control
Between system switch and ground；The positive input of described comparator is connected with the outfan in described power reference source, described comparator
Reverse input end be connected with the common port of described first sampling resistor and described power control switching, the output of described comparator
End output is divided into two-way, and a road first end with described 7th resistance after described 6th resistance is connected, and another road is successively through institute
State the second electric capacity, the 9th resistance is connected with the reverse input end of described comparator, described 6th resistance and the 7th resistive interconnections
One end is the outfan of described detection module, the second end ground connection of described 7th resistance；The outfan of described comparator is also through institute
State the 8th resistance to be connected with described first DC source.
Preferably, described detection module include the second DC source, the 3rd DC source, second voltage stabilizing adjust pipe, the tenth
Resistance, the 11st resistance, the 20th electric capacity, the 60th resistance, the 70th resistance, the 80th resistance, the 90th resistance and second
Sampling resistor, described second sampling resistor is connected between described power control switching and ground；Described second voltage stabilizing adjusts pipe
Plus earth, described second voltage stabilizing adjust pipe adjust end, the of the first end of described tenth resistance and described 11st resistance
One end interconnects, and the second end of described tenth resistance connects with the common port of described second sampling resistor and described power control switching
Connecing, the second end of described 11st resistance is connected with described 3rd DC source, and described second voltage stabilizing adjusts the negative electrode of pipe through institute
After stating the 60th resistance, the first end with described 70th resistance is connected；Described 60th resistance and the one of the 70th resistive interconnections
End is the outfan of described detection module, the second end ground connection of described 70th resistance；Described second voltage stabilizing adjusts the negative electrode of pipe
Also it is connected with described second DC source through described 80th resistance；Described second voltage stabilizing adjusts the adjustment end of pipe successively through described
The negative electrode that 20th electric capacity, the 90th resistance adjust pipe with described second voltage stabilizing is connected.
Preferably, described second DC source and described 3rd DC source are same power supply.
Preferably, described control module includes that the first switching tube and electrical switch, the base stage of described first switching tube are institute
State the signal input part of control module, the grounded emitter of described first switching tube, the current collection of described first switching tube extremely institute
State the signal output part of control module；The input end grounding of described electrical switch, the outfan of described electrical switch and described the
The base stage of one switching tube connects, and the controlled end of described electrical switch interconnects with the controlled end of described power control switching.
Preferably, described first switching tube is audion or metal-oxide-semiconductor.
Preferably, described memory module includes the 3rd electric capacity, the first end ground connection of described 3rd electric capacity, described 3rd electric capacity
Energy storage/outfan that the second end is described memory module.
Additionally, this utility model also provides for a kind of electronic installation, this electronic installation includes Switching Power Supply as above；Should
Switching Power Supply includes that power supply processing circuit and feedback control circuit, described power supply processing circuit have the electricity for powering load
Source output loop, described power supply output loop is provided with power control switching, and described feedback control circuit includes feedback control mould
Block, control module, memory module and current detection module, the input of described feedback control module and the inspection of described detection module
Survey end to be connected on described power supply output loop, the outfan of described feedback control module and described power supply processing circuit
Feedback reception end connects, described feedback control module be adjusted end and the signal output part of described control module and described note
The outfan recalling module connects；The signal input part of described control module is connected with the signal output part of described detection module；Its
In, described feedback control module, for detecting the size of current of described power supply output loop, and according to the size of current detected
Export corresponding voltage feedback signal, to control the output electric current of described power supply processing circuit；Described detection module, for institute
The electric current stating power supply output loop detects, and output detections signal；Described control module, for according to described detection module
The size of the detection signal of output adjusts the size of the voltage feedback signal of described feedback control module output accordingly；Described memory
Module, before turning off in described power control switching, remembers the input voltage of described feedback control module, so that described feedback
Control module keeps exporting described voltage feedback signal.
This utility model by the size of current of power supply output loop of feedback control module detection Switching Power Supply, and according to
The size of current detected exports corresponding voltage feedback signal, to control the output electric current of described power supply processing circuit, then
By detection module, the electric current of described power supply output loop is detected, and output detections signal, subsequently by controlling mould
The size of the detection signal that tuber exports according to detection module adjusts the voltage feedback signal of described feedback control module output accordingly
Size realize control Switching Power Supply output constant current；It addition, before power control switching turns off, by memory module memory feedback
The input voltage of control module, so that the voltage feedback signal of feedback control module output keeps constant, thus, it is to avoid in merit
When rate control switch is again turned on, load current will not steeply rise and cause constant current to lose efficacy, and improves the reliable of Switching Power Supply
Property.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiments more of the present utility model, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the electrical block diagram of prior art breaker in middle power supply；
Fig. 2 is the electrical block diagram of this utility model Switching Power Supply preferred embodiment；
Fig. 3 is the structural representation of this utility model feedback control circuit one embodiment.
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present utility model rather than all
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, broadly falls into the scope of this utility model protection.
It is to be appreciated that directional instruction (such as up, down, left, right, before and after ...) in this utility model embodiment
It is only used for explanation relative position relation under a certain particular pose (as shown in drawings) between each parts, motion conditions etc., as
When really this particular pose changes, then directionality instruction changes the most therewith.
It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose, and it is not understood that
For indicating or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ",
The feature of " second " can express or implicitly include at least one this feature.It addition, the technical side between each embodiment
Case can be combined with each other, but must be based on those of ordinary skill in the art are capable of, when the combination of technical scheme
Occur conflicting will be understood that the combination of this technical scheme does not exists, the most not in this utility model requirement when maybe cannot realize
Protection domain within.
The utility model proposes a kind of Switching Power Supply.
With reference to Fig. 2 and Fig. 3, in this utility model embodiment, this Switching Power Supply includes power supply processing circuit 10 and feedback
Control circuit 20, described power supply processing circuit 10 has the power supply output loop for powering to load RL, and described power supply exports
Loop is provided with power control switching K1.This power control switching K1 is for being connected with power controller, and this power controller leads to
Cross output power signal DIM and periodically control the on or off of power control switching K1, it is achieved power controls.Example
As, this Switching Power Supply is applied in brightness adjustment control, then power controller exports dim signal accordingly, controls power control switching
The on or off frequency of K1 realizes the regulation of backlight illumination.
Specifically, feedback control circuit 20 includes feedback control module 21, detection module 22, control module 23 and memory
It is defeated that module 24, the input of described feedback control module 21 and the test side of described detection module 22 are connected to described power supply
Going out on loop, the outfan of described feedback control module 21 is connected with the feedback reception end of described power supply processing circuit 10, described
The end that is adjusted of feedback control module 21 connects with the signal output part of described control module and the outfan of described memory module 24
Connect；The signal input part of described control module is connected with the signal output part of described detection module 22.
Wherein, described feedback control module 21, for detecting the size of current of described power supply output loop, and according to detection
The size of current arrived exports corresponding voltage feedback signal, to control the output electric current of described power supply processing circuit 10；Described inspection
Survey module 22, for the electric current of described power supply output loop is detected, and output detections signal；Described control module 23,
The size of the detection signal for exporting according to described detection module 22 adjusts the electricity of described feedback control module 21 output accordingly
The size of pressure feedback signal；Described memory module 24, before turning off in described power control switching K1, remembers described feedback control
The input voltage of molding block 21, so that described feedback control module 21 keeps exporting described voltage feedback signal.
It should be noted that when detection module 22 detects the electric current of power supply output loop less than pre-set current value, control
The voltage feedback signal that feedback control module 21 exports is heightened by molding block 23, and then makes the output electricity of power supply processing circuit 10
Stream raises and levels off to pre-set current value；When detection module 22 detects that the electric current of power supply output loop is higher than pre-set current value
Time, the voltage feedback signal that feedback control module 21 exports is turned down, and then is made power supply processing circuit 10 by control module 23
Output current reduction the pre-set current value that levels off to.Wherein pre-set current value is preferably constant current desired value.So, be achieved that right
The current constant control of Switching Power Supply.It addition, memory module 24 can remember feedback control module 21 when power control switching K1 is opened
Input voltage so that when power control switching K1 turns off, the input voltage of feedback control module 21 is constant, feedback control mould
The voltage feedback signal of block 21 output keeps constant, and so, when power control switching K1 is again turned on, load RL electric current will not
Steeply rise and cause constant current to lose efficacy, improve the reliability of Switching Power Supply.
It is understood that the Switching Power Supply that the utility model proposes detects Switching Power Supply by feedback control module 21
The size of current of power supply output loop, and export corresponding voltage feedback signal according to the size of current detected, to control
State the output electric current of power supply processing circuit 10, then by detection module 22, the electric current of described power supply output loop is examined
Survey, and output detections signal, the size of the detection signal subsequently exported according to detection module 22 by control module 23 is corresponding
The size of the voltage feedback signal adjusting the output of described feedback control module 21 realizes controlling Switching Power Supply output constant current；It addition,
When power control switching K1 turns off, remembered the input voltage of feedback control module 21 by memory module 24, so that feedback control
The voltage feedback signal of molding block 21 output keeps constant, thus, it is to avoid when power control switching K1 is again turned on, load
RL electric current will not steeply rise and cause constant current to lose efficacy, and improves the reliability of Switching Power Supply.
Preferably, above-mentioned feedback control module 21 includes that the first voltage stabilizing adjusts pipe Z1, optocoupler U, the first resistance R1, the second electricity
Resistance R2, the first electric capacity C1, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5.
Wherein, first end of described 3rd resistance R3, first end of described 4th resistance R4, the of described 5th resistance R5
One end, described first voltage stabilizing adjust the first end interconnection adjusting end and described second resistance R2 of pipe Z1, described 3rd resistance R3
The input that the second end is described feedback control module 21, the second end ground connection of described 4th resistance R4, described 5th resistance
Second end of R5 is the end that is adjusted of described feedback control module 21, and described first voltage stabilizing adjusts the plus earth of pipe Z1, described
First voltage stabilizing adjusts the negative electrode of pipe Z1 and is connected through the input of described first resistance R1 and described optocoupler U, described second resistance R2
The second end adjust the negative electrode of pipe Z1 and the common port of described first resistance R1 through described first electric capacity C1 with described first voltage stabilizing
Connect；The outfan of described optocoupler U is the outfan of described feedback control module 21.
In this embodiment, second end of the 3rd resistance R3 gathers the output voltage of power supply processing circuit 10, the 3rd resistance R3
Export after the output voltage gathered being carried out voltage division processing with the 4th resistance R4 to optocoupler U, feed back to power supply by optocoupler U isolation
Processing circuit 10, to realize current constant control, wherein the first voltage stabilizing adjusts pipe Z1 for regulation the 3rd resistance R3 and the 4th resistance R4
The voltage accuracy of dividing potential drop output, improves the precision of feedback control.
Preferably, above-mentioned detection module 22 include the first DC source VAUS1, power reference source VREF, comparator U1,
Two electric capacity C2, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the first sampling resistor RS.
Wherein, described first sampling resistor RS is connected between described power control switching K1 and ground；Described comparator U1
Positive input be connected with the outfan of described power reference source VREF, the reverse input end of described comparator U1 and described the
The common port of one sampling resistor RS and described power control switching K1 connects, and the outfan output of described comparator U1 is divided into two
Road, a road first end with described 7th resistance R7 after described 6th resistance R6 is connected, and another road is successively through described second electricity
Hold C2, the 9th resistance R9 to be connected with the reverse input end of described comparator U1, described 6th resistance R6 and the 7th resistance R7 interconnection
The outfan that one end is described detection module 22, the second end ground connection of described 7th resistance R7；The output of described comparator U1
End is also connected with described first DC source VAUS1 through described 8th resistance R8.In this embodiment, power reference source VREF is just
Extremely outfan, the minus earth of power reference source VREF.The reverse input end of comparator U1 gathers on the first sampling resistor RS
Pressure drop, and the voltage of the power reference source VREF inputted with the positive input of comparator U1 compares, and exports and compare
After signal to the 6th resistance R6 and the 7th resistance R7, control by being used for after the 6th resistance R6 and the 7th resistance R7 dividing potential drop
Module works.
It should be noted that above-mentioned detection module 22 can use below scheme to replace realizing.
As it is shown on figure 3, above-mentioned detection module 22 include the second DC source VAUS2, the 3rd DC source VAUS3, second
Voltage stabilizing adjusts pipe Z2, the tenth resistance R10, the 11st resistance R11, the 20th electric capacity C20, the 60th resistance R60, the 70th resistance
R70, the 80th resistance R80, the 90th resistance R90 and the second sampling resistor (not shown, to refer to the first sampling resistor RS).
Wherein, described second sampling resistor is connected between described power control switching K1 and ground；Described second voltage stabilizing is adjusted
The plus earth of homogeneous tube Z2, what described second voltage stabilizing adjusted pipe Z2 adjusts end, first end of described tenth resistance R10 and described the
The first end interconnection of 11 resistance R11, second end of described tenth resistance R10 and described second sampling resistor and described power control
The common port of system switch K1 connects, and second end of described 11st resistance R11 is connected with described 3rd DC source VAUS3, institute
State the second voltage stabilizing to adjust the negative electrode of pipe Z2 first end with described 70th resistance R70 after described 60th resistance R60 and be connected；
The outfan that one end is described detection module 22 of described 60th resistance R60 and the 70th resistance R70 interconnection, the described 70th
The second end ground connection of resistance R70；Described second voltage stabilizing adjusts the negative electrode of pipe Z2 also through described 80th resistance R80 and described second
DC source VAUS2 connects；Described second voltage stabilizing adjust pipe Z2 adjustment end successively through described 20th electric capacity C20, the 90th
The negative electrode that resistance R90 adjusts pipe Z2 with described second voltage stabilizing is connected.
In this embodiment, by the tenth resistance R10, the voltage on the first sampling resistor RS is transmitted to the second voltage stabilizing adjustment
The adjustment end of pipe Z2, the second voltage stabilizing adjusts pipe Z2 and is compared with its threshold voltage by the voltage sampled, and after output relatively
Signal to the 60th resistance R60 and the 70th resistance R70, by using after the 60th resistance R60 and the 70th resistance R70 dividing potential drop
Work in controlling control module 23.Wherein, described second DC source VAUS2 and described 3rd DC source VAUS3 can be same
One power supply.
Preferably, above-mentioned control module 23 includes the first switching tube Q1 and electrical switch K2.
Wherein, the signal input part that base stage is described control module 23 of described first switching tube Q1, described first switch
The grounded emitter of pipe Q1, the signal output part of the most described control module of current collection 23 of described first switching tube Q1；Described electricity
The input end grounding of son switch K2, the outfan of described electrical switch K2 is connected with the base stage of described first switching tube Q1, described
The controlled end of electrical switch K2 interconnects with the controlled end of described power control switching K1.First switching tube Q1 is according to detection module 22
The signal magnitude of detection output, changes the output voltage of its colelctor electrode, and then controls the output voltage of feedback control module 21.Its
In, electrical switch K2 and power control switching K1 switched conductive within the same cycle of power control signal DIM.
Wherein, described first switching tube Q1 can be audion (the first switching tube Q1 as shown in Figure 2) or metal-oxide-semiconductor (as
The first switching tube Q1 shown in Fig. 3).Electrical switch K2 can be audion or metal-oxide-semiconductor.
Preferably, above-mentioned memory module 24 includes the 3rd electric capacity C3, the first end ground connection of described 3rd electric capacity C3, described
Second end of three electric capacity C3 is the outfan of described memory module 24.
To sum up, and combine Fig. 2 and Fig. 3, the physical circuit principle of this utility model Switching Power Supply be described in detail:
It should be noted that detection module 22 is as a example by the embodiment of comparator U1 in this circuit theory.Further, set
The output voltage that 3rd resistance R3 and the 4th resistance R4 dividing potential drop set is less than output voltage during constant current operation.Pass through detection module
22 detection load RL operating currents, then controlled accordingly by control module, to realize output constant current.
Specifically, second end of the 3rd resistance R3 gathers the output voltage of power supply processing circuit 10, the 3rd resistance R3 and the
Four resistance R4 export after the output voltage gathered is carried out voltage division processing to optocoupler U, feed back to power supply by optocoupler U isolation and process
Circuit 10, to realize current constant control.
Wherein, the reverse input end of comparator U1 gathers the pressure drop on the first sampling resistor RS, and with comparator U1 just
Voltage to the power reference source VREF of input input compares, and obtains the error voltage after comparison, and exports this voltage
Signal is to the 6th resistance R6 and the 7th resistance R7, by switching for control first after the 6th resistance R6 and the 7th resistance R7 dividing potential drop
Pipe Q1 works.
First switching tube Q1, according to the signal magnitude of detection module 22 detection output, changes the output voltage of its colelctor electrode,
To adjust the voltage increment formed on the 5th resistance R5.
When loading RL operating current less than setting value, the voltage signal of comparator U1 output is relatively big, then the first switching tube
The collector voltage of Q1 is relatively big, and then the increment current and the incremental voltage that are formed on the 5th resistance R5 are the biggest, thus, and the 3rd electricity
Voltage on resistance R3 is the biggest, and so, after optocoupler U feedback control, the output electric current of power supply processing circuit 10 raises, and makes
Load RL operating current levels off to constant current setting value, it is achieved current constant control.When loading RL operating current higher than setting value, compare
The voltage signal of device U1 output is less, then the collector voltage of the first switching tube Q1 is less, and then formed on the 5th resistance R5
Increment current and incremental voltage are the least, and thus, the voltage on the 3rd resistance R3 is the least, so, by optocoupler U feedback control
After, the output current reduction of power supply processing circuit 10, make load RL operating current level off to constant current setting value, it is achieved constant current control
System.It is understood that owing to the 3rd electric capacity C3 and the first switching tube Q1 is in parallel, therefore, in the whole work of Switching Power Supply
During work, the voltage being carried on the first switching tube Q1 and the voltage swing being carried on the 3rd electric capacity C3 are equal.
If it addition, now, power control switching K1 turns off, then electrical switch K2 opens, and the first switching tube Q1 turns off.Due to
3rd electric capacity C3 has remembered the collector voltage of the first switching tube Q1 before this so that be carried in the voltage at the 5th resistance R5 two ends with
Power switch pipe K1 is identical before turning off, and current increment and voltage increment that the 5th resistance R5 is formed are constant.Therefore, the 3rd resistance
Still can keep previous voltage ratio on R3, thus when power control switching K1 is opened again, may remain in power control
Voltage before system switch K1 shutoff, sample has been maintained for the constant of electric current, improves the reliability of circuit.
This utility model also proposes a kind of electronic installation, and this electronic installation includes above-mentioned Switching Power Supply, this electronic installation
Concrete structure is with reference to above-described embodiment, owing to this utility model electronic installation have employed whole technical sides of above-mentioned all embodiments
Case, the most at least has all beneficial effects that the technical scheme of above-described embodiment is brought, and this is no longer going to repeat them.Its
In, electronic installation can be television set, LCDs etc..
The foregoing is only preferred embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model,
Every under inventive concept of the present utility model, the equivalent structure utilizing this utility model description and accompanying drawing content to be made becomes
Change, or directly/be indirectly used in other relevant technical fields and be included in scope of patent protection of the present utility model.
Claims (9)
1. a Switching Power Supply, including power supply processing circuit and feedback control circuit, described power supply processing circuit have for
The power supply output loop of load supplying, described power supply output loop is provided with power control switching, it is characterised in that described feedback
Control circuit includes feedback control module, control module, memory module and current detection module, described feedback control module defeated
The test side entering end and described detection module is connected on described power supply output loop, the output of described feedback control module
End is connected with the feedback reception end of described power supply processing circuit, described feedback control module be adjusted hold and described control module
Signal output part and described memory module outfan connect；The signal input part of described control module and described detection module
Signal output part connect；Wherein,
Described feedback control module is for detecting the size of current of described power supply output loop and big according to the electric current detected
The corresponding voltage feedback signal of little output, to control the output electric current of described power supply processing circuit；
Described detection module, for the electric current of described power supply output loop is detected, and output detections signal；
Described control module, the size of the detection signal for exporting according to described detection module adjusts described feedback control accordingly
The size of the voltage feedback signal of module output；
Described memory module, before turning off in described power control switching, remembers the input voltage of described feedback control module,
So that described feedback control module keeps exporting described voltage feedback signal.
2. Switching Power Supply as claimed in claim 1, it is characterised in that described feedback control module includes that the first voltage stabilizing adjusts
Pipe, optocoupler, the first resistance, the second resistance, the first electric capacity, the 3rd resistance, the 4th resistance and the 5th resistance, described 3rd resistance
First end, the first end of described 4th resistance, the first end of described 5th resistance, described first voltage stabilizing adjust pipe adjustment end and
First end interconnection of described second resistance, the input that the second end is described feedback control module of described 3rd resistance, described
Second end ground connection of the 4th resistance, the second end of described 5th resistance is the end that is adjusted of described feedback control module, described the
One voltage stabilizing adjusts the plus earth of pipe, and described first voltage stabilizing adjusts the negative electrode input through described first resistance Yu described optocoupler of pipe
End connects, and the second end of described second resistance adjusts the negative electrode and described first of pipe through described first electric capacity and described first voltage stabilizing
The common port of resistance connects；The outfan of described optocoupler is the outfan of described feedback control module.
3. Switching Power Supply as claimed in claim 1, it is characterised in that described detection module includes the first DC source, power supply
A reference source, comparator, the second electric capacity, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the first sampling resistor, described
First sampling resistor is connected between described power control switching and ground；The positive input of described comparator and described power supply base
The outfan connection in quasi-source, the reverse input end of described comparator and described first sampling resistor and described power control switching
Common port connects, and the output of the outfan of described comparator is divided into two-way, a road after described 6th resistance with described 7th resistance
First end connect, another road is connected with the reverse input end of described comparator through described second electric capacity, the 9th resistance successively, institute
State the outfan that one end is described detection module of the 6th resistance and the 7th resistive interconnections, the second termination of described 7th resistance
Ground；The outfan of described comparator is also connected with described first DC source through described 8th resistance.
4. Switching Power Supply as claimed in claim 1, it is characterised in that described detection module include the second DC source, the 3rd
DC source, second voltage stabilizing adjust pipe, the tenth resistance, the 11st resistance, the 20th electric capacity, the 60th resistance, the 70th resistance,
80th resistance, the 90th resistance and the second sampling resistor, described second sampling resistor be connected to described power control switching with
Between ground；Described second voltage stabilizing adjusts the plus earth of pipe, and what described second voltage stabilizing adjusted pipe adjusts end, described tenth resistance
First end and the first end interconnection of described 11st resistance, the second end of described tenth resistance and described second sampling resistor and institute
The common port stating power control switching connects, and the second end of described 11st resistance is connected with described 3rd DC source, described
Second voltage stabilizing adjusts the negative electrode of pipe the first end with described 70th resistance after described 60th resistance and is connected；Described 60th
Resistance and the outfan that one end is described detection module of the 70th resistive interconnections, the second end ground connection of described 70th resistance；
The negative electrode that described second voltage stabilizing adjusts pipe is also connected with described second DC source through described 80th resistance；Described second voltage stabilizing
The end that adjusts adjusting pipe is connected with the negative electrode of described second voltage stabilizing adjustment pipe through described 20th electric capacity, the 90th resistance successively.
5. Switching Power Supply as claimed in claim 4, it is characterised in that described second DC source and described 3rd DC source
For same power supply.
6. Switching Power Supply as claimed in claim 1, it is characterised in that described control module includes the first switching tube and electronic cutting
Closing, the signal input part that base stage is described control module of described first switching tube, the emitter stage of described first switching tube connects
Ground, the signal output part of the most described control module of current collection of described first switching tube；The input end grounding of described electrical switch,
The outfan of described electrical switch is connected with the base stage of described first switching tube, the controlled end of described electrical switch and described power
Control the controlled end interconnection of switch.
7. Switching Power Supply as claimed in claim 6, it is characterised in that described first switching tube is audion or metal-oxide-semiconductor.
8. Switching Power Supply as claimed in claim 1, it is characterised in that described memory module includes the 3rd electric capacity, the described 3rd
First end ground connection of electric capacity, the outfan that the second end is described memory module of described 3rd electric capacity.
9. an electronic installation, it is characterised in that include the Switching Power Supply as described in claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620221801.5U CN205753993U (en) | 2016-03-22 | 2016-03-22 | Switching Power Supply and electronic installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620221801.5U CN205753993U (en) | 2016-03-22 | 2016-03-22 | Switching Power Supply and electronic installation |
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| Publication Number | Publication Date |
|---|---|
| CN205753993U true CN205753993U (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620221801.5U Expired - Fee Related CN205753993U (en) | 2016-03-22 | 2016-03-22 | Switching Power Supply and electronic installation |
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| CN (1) | CN205753993U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793322A (en) * | 2016-12-30 | 2017-05-31 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN106982051A (en) * | 2017-05-19 | 2017-07-25 | 北京美思安科技有限公司 | A kind of power switch protection circuit |
| CN107579648A (en) * | 2017-08-04 | 2018-01-12 | 许继电源有限公司 | A kind of inverse-excitation type switch power-supply and its control circuit |
| CN108736706A (en) * | 2018-08-01 | 2018-11-02 | 杭州老板电器股份有限公司 | Controllable switch power supply and purification water tank comprising the power supply |
| WO2024092953A1 (en) * | 2022-11-01 | 2024-05-10 | 深圳国爱全电化智慧科技有限公司 | Current feedback circuit and electric stove |
-
2016
- 2016-03-22 CN CN201620221801.5U patent/CN205753993U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793322A (en) * | 2016-12-30 | 2017-05-31 | 深圳Tcl数字技术有限公司 | Led drive circuit |
| CN106793322B (en) * | 2016-12-30 | 2020-05-19 | 深圳Tcl数字技术有限公司 | LED drive circuit |
| CN106982051A (en) * | 2017-05-19 | 2017-07-25 | 北京美思安科技有限公司 | A kind of power switch protection circuit |
| CN107579648A (en) * | 2017-08-04 | 2018-01-12 | 许继电源有限公司 | A kind of inverse-excitation type switch power-supply and its control circuit |
| CN108736706A (en) * | 2018-08-01 | 2018-11-02 | 杭州老板电器股份有限公司 | Controllable switch power supply and purification water tank comprising the power supply |
| WO2024092953A1 (en) * | 2022-11-01 | 2024-05-10 | 深圳国爱全电化智慧科技有限公司 | Current feedback circuit and electric stove |
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