CN205864260U - Sluggish type power circuit - Google Patents
Sluggish type power circuit Download PDFInfo
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- CN205864260U CN205864260U CN201620718741.8U CN201620718741U CN205864260U CN 205864260 U CN205864260 U CN 205864260U CN 201620718741 U CN201620718741 U CN 201620718741U CN 205864260 U CN205864260 U CN 205864260U
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Abstract
This utility model discloses a kind of sluggish type power circuit, including: input circuit, switch combination circuit, sampling and control circuit, feedback circuit and output circuit.Input circuit is connected to power input, carries out power supply input rectification and provides the insulation blocking of input.Switch combination circuit is connected to input circuit, opens or turn off to control the output of power output end.Sampling and control circuit sampling and outputting voltage output voltage is compared with reference voltage, opening or turning off according to result of the comparison control switch combination circuit.Feedback circuit is connected between switch combination circuit and sampling and control circuit, and switch combination circuit exports positive feedback signal to sampling with control circuit by feedback circuit, and positive feedback signal makes the comparison of reference power supply chip produce hesitation.Output circuit is connected to switch combination circuit, and the output to switch combination circuit is filtered and provides the insulation blocking of outfan, and its output is as the output of sluggish type power circuit.
Description
Technical field
This utility model relates to Low Voltage Electrical Apparatus, more particularly, it relates to the power circuit powered for chopper.
Background technology
Along with the continuous progress of low voltage electrical apparatus industry, moulded case circuit breaker (breaker of plastic casing) forward is intelligent, can
Communication development.The intelligent of breaker of plastic casing is mainly realized by electronic device, therefore, it is also desirable to for element and chopper
The power circuit of power supply.The lifting reliably and stably be unableing to do without power circuit Performance And Reliability of intelligent controller.Meanwhile, electricity
Source circuit owing to changing in forceful electric power and light current circuit, easily occur overvoltage, cross flow, puncture, the problem such as electromagnetic interference, in a hurry
Need to improve its stability and capacity of resisting disturbance, make power circuit that high-power input both can have been received to damage, the most permissible
Stable output is provided in the case of power input is little.Therefore, design a kind of simple effectively, stable performance, safe and reliable electricity
Source circuit becomes urgent needs.
Prior art proposes a kind of power circuit, including quick-magnetic saturated current transformer, rectification circuit, on-off circuit list
Unit, control unit.Control unit controls the conducting of on-off circuit unit or uses by, control unit and have operational amplifier to constitute
Positive feedback hysteresis unit.Using operational amplifier to produce sluggish signal in this kind of scheme, therefore circuit is complex, and cost is high
And easily break down.
Prior art also proposes a kind of power circuit, becomes including input filter circuit, current rectifying and wave filtering circuit, single-ended switch
Change circuit, switching power source control circuit and secondary commutation filter circuit.This power circuit is in the feelings individually powered by energy coil
Under condition, the amplitude of the energy of energy coil output can be detected, and realize the control to two-way power supply according to amplitude.Should
Being powered by the Switching Power Supply of isolated form in scheme so that control circuit structure is complicated, circuit volume is relatively big, is not suitable for miniaturization
Breaker of plastic casing.
Prior art also proposes a kind of power circuit, including for judging whether to generate the overvoltage sampling mold of overvoltage signal
Block, for judging whether to generate the under-voltage sampling module of under-voltage signal, for overvoltage or under-voltage signal are generated protection signal
Signal generation module and the signal hysteresis module of the protection signal after delay process is protected signal and exported process.The program
Middle hesitation is to realize by changing electric resistance partial pressure value, needs complicated calculating and operation, and overvoltage signal and under-voltage
Signal separately sampling makes circuit more complicated, further needs exist for providing auxiliary DC power supply.
Prior art also proposes a kind of power circuit, including voltage sampling circuit, control circuit, hysteresis circuit；Power supply
Input voltage terminal, DC offset voltage end, Switching Power Supply controls end.Input sampling circuit uses three resistant series, forms electricity
Resistance potentiometer.Control circuit uses error amplifier, and error amplifier connects biasing resistor, according to the sampling of input sampling circuit
Signal, controls protection point Switching Power Supply and controls the level of end.When Switching Power Supply is higher than setting value, closing switch power supply, rises
Effect to protection Switching Power Supply.The program employs three series resistances as divider resistance so that calculate more complicated,
And also auxiliary DC power supply must be used.
In a word, generally there is circuit complexity in prior art, volume is big, device is many, calculating process complicated, high the asking of cost
Topic.
Utility model content
This utility model discloses a kind of sluggish type power circuit, including: input circuit, switch combination circuit, sampling with
Control circuit, feedback circuit and output circuit.Input circuit is connected to power input, and power supply input is carried out whole by input circuit
Flow and provide the insulation blocking of input.Switch combination circuit is connected to input circuit, and switch combination circuit is opened or turned off
To control the output of power output end.Sample and control circuit sampling and outputting voltage by output voltage and reference voltage ratio
Relatively, sampling controls opening or turning off of switch combination circuit with control circuit according to result of the comparison.Feedback circuit is connected to
Between switch combination circuit and sampling and control circuit, switch combination circuit is exported with control circuit to sampling by feedback circuit
Positive feedback signal, positive feedback signal makes the comparison of reference power supply chip produce hesitation.Output circuit is connected to out
Closing combinational circuit, output circuit is filtered and provides the insulation blocking of outfan, output electricity to the output of switch combination circuit
The output on road is as the output of sluggish type power circuit.
In one embodiment, the controller during output circuit is output as breaker of plastic casing is powered.
In one embodiment, in controller during output circuit is output as breaker of plastic casing and breaker of plastic casing
The flux guide of electrical apparatus release is powered.
In one embodiment, output circuit is also connected to auxiliary DC power supply.Output circuit includes power input, auxiliary
Help the several paths between DC source and power output end, dropout magnetic flux power output end.
In one embodiment, switch combination circuit includes field effect transistor and stabilivolt, by control field effect transistor and
Stabilivolt open or turn off the output controlling power output end.
In one embodiment, field effect transistor includes big current power field effect transistor.
In one embodiment, field effect transistor includes enhancement mode field effect transistor and big current power field effect transistor, big electric current
The grid of power field effect pipe is connected with the drain electrode of enhancement mode field effect transistor, and this point is as feedback point.
In one embodiment, sampling and control circuit include reference power supply chip, and reference power supply chip produces benchmark electricity
Pressure.Sampling and control circuit are according to the opening or closing of field effect transistor and stabilivolt in result of the comparison control switch combination circuit
Disconnected.
In one embodiment, sampling and control circuit include that sample circuit, sample circuit include a pair sampling resistor, one
Ratio to the resistance value of sampling resistor is 1:[(Vout/Vref)-1], wherein Vout is output voltage, and Vref is reference voltage,
It is sampled point between this pair sampling resistor.
In one embodiment, feedback circuit is feedback resistance, and feedback resistance is connected between feedback point and sampled point, adopts
Sampling point is connected to the reference edge of reference power supply chip.
In one embodiment, output circuit includes filter circuit.
In one embodiment, input circuit and output circuit include insulation blocking device.
Sluggish type power circuit of the present utility model uses reference power supply chip substitution operation amplifier to produce control letter
Number so that circuit structure is simpler, and cost is lower.Feedback circuit is directly connected to feedback point and sampled point, to reference power supply core
Sheet feeds back, and circuit is simple but can increase the operation sluggishness type of reference power supply chip so that the control of reference power supply chip is more
Adding stable, capacity of resisting disturbance is higher.Configure big current power field effect transistor in circuit, can receive when the input of big electric current occurs
And consuming surplus power, protection back-end circuit is not by heavy current impact so that the upper limit of input current significantly improves.
On the whole, sluggish type power circuit volume of the present utility model is little, low cost, and device loss is little, service life
Long, and high-frequency electromagnetic interference can be reduced.
Accompanying drawing explanation
The above and other feature of this utility model, character and advantage by by below in conjunction with the accompanying drawings with embodiment
Describing and become apparent, the most identical reference represents identical feature all the time, wherein:
Fig. 1 discloses the structured flowchart of the sluggish type power circuit according to an embodiment of the present utility model.
Fig. 2 discloses the circuit theory diagrams of the first embodiment according to sluggish type power circuit of the present utility model.
Fig. 3 discloses the circuit theory diagrams of the second embodiment according to sluggish type power circuit of the present utility model.
Detailed description of the invention
With reference to shown in Fig. 1, Fig. 1 discloses the structural frames of the sluggish type power circuit according to an embodiment of the present utility model
Figure.As it is shown in figure 1, sluggish type power circuit of the present utility model includes input circuit 102, switch combination circuit 104, feedback electricity
Road 106, sampling and control circuit 108 and output circuit 110.
Input circuit 102 is connected to power input, and input circuit 102 carries out rectification to power supply input and provides input
Insulation blocking.
Switch combination circuit 104 is connected to input circuit 102, and switch combination circuit 104 is opened or turn off to control electricity
The output of source output terminal.In one embodiment, switch combination circuit 104 includes field effect transistor and stabilivolt, passes through
Control field effect transistor and stabilivolt opens or turns off the output controlling power output end.
Sampling and control circuit 108 sampling and outputting voltage being compared with reference voltage by output voltage, sample and control electricity
Road 108 controls opening or turning off of switch combination circuit 104 according to result of the comparison.In one embodiment, sample and control
Circuit 108 processed includes reference power supply chip, and reference power supply chip produces reference voltage.Sample with control circuit 108 according to comparing
Output control switch combination circuit 104 in the opening or turning off of field effect transistor and stabilivolt.
Feedback circuit 106 is connected between switch combination circuit 104 and sampling and control circuit 108.Switch combination circuit
104 export positive feedback signal by feedback circuit 106 to sampling and control circuit 108, and positive feedback signal makes reference power supply core
The comparison of sheet produces hesitation.It is based on reference voltage and sampling defeated that positive feedback signal enables to reference power supply chip
Go out the more stable of voltage, it is to avoid owing to voltage dithering causes the frequent break-make of switch combination circuit, and therefore reduce by
The energy loss caused in frequent break-make and electromagnetic interference.
Output circuit 110 is connected to switch combination circuit 104, and the output of switch combination circuit 104 is entered by output circuit 110
Row filters and provides the insulation blocking of outfan, and the output of output circuit 110 is as the output of sluggish type power circuit.Output electricity
The output on road 110 can be that the controller in breaker of plastic casing is powered and/or for the magnetic flux control of the electrical apparatus release in breaker of plastic casing
Device processed provides drop away voltage.
With reference to shown in Fig. 2, Fig. 2 discloses the circuit of the first embodiment according to sluggish type power circuit of the present utility model
Schematic diagram.In the first embodiment shown in Fig. 2, input circuit 102 is the first diode D1.First diode D1 plays electricity
Source input carries out the effect of rectification and insulation blocking.Switch combination circuit 104 includes the first field effect transistor V1, the second field effect transistor
V2, the second diode D2, the 3rd diode D3, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.Its
In the first field effect transistor V1 be N-channel enhancement mode field effect transistor, the second field effect transistor V2 is N-channel big current power field effect
Pipe.Second diode D2 and the 3rd diode D3 plays the effect of voltage stabilizing, is stabilivolt.Feedback circuit 106 is the 7th resistance R7.
Sampling and control circuit 108 include reference power supply chip U1, the 5th resistance R5 and the 6th resistance R6.Reference power supply chip U1 is three
End adjustable shunt reference power supply chip, reference power supply chip U1 produces reference power supply.5th resistance R5 and the 6th resistance R6 conduct
Divider resistance uses, and the 5th resistance R5 and the 6th resistance R6 is for sampling and outputting voltage and is supplied to reference power supply chip U1.Defeated
Go out circuit 110 and include the 4th diode D4, the first electric capacity C1 and the second electric capacity C2, the first electric capacity C1 and the second electric capacity C2 composition filter
Wave circuit.
Power input Vin is connected to anode and the second field effect transistor (N-channel big current power field of the first diode D1
Effect pipe) drain electrode of V2.The negative electrode of the first diode D1 is connected to first end of the first resistance R1, first end of the 4th resistance R4
With first end of the 5th resistance R5, the first resistance R1, the 4th resistance R4 and the 5th resistance R5 all realize the function of divider resistance,
Effect herein is pull-up current potential, and the first resistance R1, the 4th resistance R4 and the 5th resistance R5 use as pull-up resistor.First
Second end of resistance R1 connects the negative electrode of the second diode (stabilivolt) D2.The anode of the second diode D2 connects the second field effect
The grid of pipe V2, the first field effect transistor (the N-channel enhancement mode field effect transistor) drain electrode of V1, the 7th resistance R7 and the second resistance R2
First end, foregoing circuit cross point is feedback point A point.7th resistance R7 is feedback resistance, and the second resistance R2 is divider resistance, the
The effect of two resistance R2 is drop-down current potential, uses as pull down resistor.The source ground of the second field effect transistor V2.7th resistance
Second end of (feedback resistance) R7 connects the reference pole of benchmark power supply chip (three end adjustable shunt reference power supply chips) U1, above-mentioned
Circuit cross-overs point be sampled point B.The second end ground connection of the second resistance R2.The grid of the first field effect transistor V1 and the 3rd diode
First end of (stabilivolt) D3 anode and the 3rd resistance R3 connects, the source ground of the first field effect transistor V1.3rd resistance R3 is
Divider resistance, the effect of the 3rd resistance R3 is drop-down current potential, uses as pull down resistor.The second end ground connection of the 3rd resistance R3.
The negative electrode of the 3rd diode D3 connects negative electrode and second end of the 4th resistance R4 of benchmark power supply chip U1.Reference power supply chip U1
Plus earth.The reference pole of reference power supply chip U1 and second end of the 7th resistance R7, second end of the 5th resistance R5 and
First end of the 6th resistance R6 is connected.7th resistance R7 is feedback resistance.Feedback resistance, the i.e. the 7th resistance R7 is attached to feedback
Point and sampled point, i.e., between A point and B point, be consequently formed the switch combination circuit 104 positive feedback to sampling with control circuit 108.
5th resistance R5 and the 6th resistance R6 is divider resistance, herein, reference voltage is carried out dividing potential drop.First end of the 5th resistance R5
It is connected with first end of the 4th resistance R4, is also connected to the anode of the 4th diode D4.The second end ground connection of the 6th resistance R6.The
One electric capacity C1 and the second electric capacity C2 is connected across between anode and the ground of the 4th diode D4, and the first electric capacity C1 and the second electric capacity C2 is
Filter capacitor.The negative electrode of the 4th diode D4 is connected to power output end PVcc.
In the first embodiment shown in Fig. 2, output circuit 110 only one of which power output end PVcc, this power supply exports
End is for powering for the controller in breaker of plastic casing.
In first embodiment shown in Fig. 2, the model of all parts or parameter select as follows: reference power supply chip is three
End adjustable shunt reference power supply chip, can select TL431AIDBZR model.First field effect transistor V1 is N-channel enhancement mode field
Effect pipe, can select 2N7002K model.Second field effect transistor is N-channel big current power field effect transistor, can select
STD60NF06 model.Second diode D2 is stabilivolt, can select BZX84-C15 model.3rd diode D3 is voltage stabilizing
Pipe, can select BZX84-C5V1 model.First diode D1, the second diode D4 can select M7 model.First resistance R1
Being pull-up resistor, resistance value is 1k.Second resistance R2 is pull down resistor, and resistance value is 10k.3rd resistance R3 is pull down resistor,
Resistance value is 10k.4th resistance R4 is pull-up resistor, and resistance value is 4.7l.5th resistance R5 and the 6th resistance R6 is as dividing potential drop
And sampling resistor, resistance ratio meets following requirement: R5/R6=(Vout/Vref)-1.Wherein Vref is reference power supply chip
Reference edge produce reference voltage.Requirement according to output voltage Vout selects the resistance value of R5 and R6.An enforcement
In example, the resistance value of the 5th resistance R5 is 100k, and the resistance value of the 6th resistance R6 is 10k.7th resistance R7 is feedback resistance, electricity
Resistance is 100k.First electric capacity C1 and the second electric capacity C2 is filter capacitor, and the capacitance of the first electric capacity C1 is 220uF, the second electricity
The capacitance holding C2 is 100nF.
The operation principle of the sluggish type power circuit of first embodiment is as follows: when outside supply voltage is just opened, electricity
The input voltage of source input Vin is started from scratch and is slowly risen.The output voltage values of power output end PVcc is less than preset value, choosing
Take sampling resistor R5 and R6 of suitable resistance ratio, output voltage values is sampled.Series connection at two resistance of R5 and R6
Junction produces the reference voltage that the reference edge of partial pressure value, this partial pressure value and three end adjustable shunt reference power supply chip U1 produces
Vref compares.In one embodiment, reference voltage V ref is 2.5V.If above-mentioned partial pressure value is less than reference voltage
2.5V, then three end adjustable shunt reference power supply chip U1 are off state, and its negative electrode is maintained at high level, at this moment stabilivolt D3
Conducting, the grid making the first field effect transistor V1 is high level, and the first field effect transistor V1 is in the conduction state.First field effect transistor V1
Grounded drain so that second field effect transistor V2 turn off, do not interfere with input voltage continuation raise.
When the input voltage of power input Vin slowly rises, the output voltage values of power output end PVcc reaches and greatly
When preset value, sampling resistor R5 Yu R6 carries out partial pressure value and the three end adjustable shunt benchmark that sampling obtains to the magnitude of voltage of output
The reference voltage of the reference edge of power supply chip U1 compares, and partial pressure value reaches and is more than reference voltage 2.5V so that three ends are adjustable
Reference power supply chip U1 is in the conduction state in shunting, and its cathode voltage is pulled low, the conducting voltage of output 2V.This conducting voltage makes
Obtaining stabilivolt D3 to turn off, the grid of the first field effect transistor V1 is pulled down resistance R3 and is pulled down to low level, at the first field effect transistor V1
In off state.Dividing potential drop due to resistance R1, stabilivolt D2 Yu resistance R2 so that the drain voltage of the first field effect transistor V1 is more than
This voltage positive feedback is given the reference edge of three end adjustable shunt reference power supply chip U1 by 7V, feedback point A, makes three end adjustable shunt bases
Quasi-power supply chip U1 is persistently held on, and the second field effect transistor V2 conducting made.After second field effect transistor V2 conducting, power supply is defeated
Enter and hold Vin to be grounded.Owing to the second field effect transistor is N-channel big current power field effect transistor, the energy of power input input
Consumed by the second field effect transistor V2 by the form of heat energy.The input voltage of power input Vin slowly declines, but due to feedback
The positive feedback of some A, three end adjustable shunt reference power supply chip U1 are held on, until the voltage of feedback point A is reduced to certain value,
Sampled point B is made again to turn off again less than reference voltage 2.5V, three end adjustable shunt reference power supply chip U1.First field effect transistor
V1 turns on, and again makes the second field effect transistor V2 turn off, and the input voltage of power input Vin no longer reduces.But now feed back
The level of some A remains as low level, feeds back to three end adjustable shunt reference power supply chip U1 reference points, makes three end adjustable shunt bases
Quasi-power supply chip U1 persistently turns off, until the input voltage of power input Vin rises to preset value again.
The positive feedback signal of feedback circuit makes the comparison of reference power supply chip produce hesitation.Positive feedback signal
Enable to the more stable of reference power supply chip output voltage based on reference voltage and sampling, it is to avoid owing to voltage is trembled
The dynamic frequent break-make causing switch combination circuit, and therefore reduce the energy loss and electromagnetic interference caused due to frequent break-make.
The second field effect transistor in switch combination circuit 104 is N-channel big current power field effect transistor, such as
STD60NF06 model.Big current power field effect transistor can absorb unnecessary power and with heat energy when there is heavy current impact
Mode by power consumption, thus improve the restriction of input current, the restriction of input current can rise to several from tens milliamperes
Peace.
With reference to shown in Fig. 3, Fig. 3 discloses the circuit of the second embodiment according to sluggish type power circuit of the present utility model
Schematic diagram.As it is shown on figure 3, the second embodiment is based on the circuit theory diagrams of first embodiment, output circuit 110 is done one
Fixed change.In a second embodiment, output circuit 110 includes the 4th diode D4, the 5th diode D5, the 6th diode
D6, the 7th diode D7, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4.Output circuit 110 has
Two-way input and two-way export.At output facet, in addition to power output end PVcc, also include dropout magnetic flux power output end
TVcc.In terms of input, in addition to power input Vin, also include auxiliary DC power supply Vcc.As it is shown on figure 3, by the
Five diode D5, the 6th diode D6 and the 7th diode D7, output circuit 110 sets up two inputs and two outfans
Between a plurality of path.Above-mentioned the 5th diode D5, the 6th diode D6 and the 7th diode D7 all plays and inputs power supply
Carry out the effect of rectification and insulation blocking.
Input circuit 102 remains the first diode D1.First diode D1 play to power supply input carry out rectification and every
Effect from protection.Switch combination circuit 104 still includes the first field effect transistor V1, the second field effect transistor V2, the second diode
D2, the 3rd diode D3, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.Wherein the first field effect transistor
V1 is N-channel enhancement mode field effect transistor, and the second field effect transistor V2 is N-channel big current power field effect transistor.Second diode D2
With the effect that the 3rd diode D3 plays voltage stabilizing, it it is stabilivolt.Feedback circuit 106 is the 7th resistance R7.Sampling and control circuit
108 include reference power supply chip U1, the 5th resistance R5 and the 6th resistance R6.Reference power supply chip U1 is three end adjustable shunt benchmark
Power supply chip, reference power supply chip U1 produces reference power supply.5th resistance R5 and the 6th resistance R6 uses as divider resistance, the
Five resistance R5 and the 6th resistance R6 are for sampling and outputting voltage and are supplied to reference power supply chip U1.
The circuit diagram of first embodiment, as a part for the circuit diagram of the second embodiment, keeps constant, it is provided that power supply is defeated
Entering to hold Vin to the current path of power output end PVcc, power output end PVcc is used for as the controller in breaker of plastic casing
Power supply.
The anode of the 5th diode D5 is connected to power input Vin, and the negative electrode of the 5th diode D5 is connected to dropout magnetic
Energising source output terminal TVcc.The anode of the 6th diode D6 is connected to auxiliary DC power supply Vcc, and the negative electrode of the 6th diode D6 is even
Receive power output end PVcc.The anode of the 7th diode D7 is connected to auxiliary DC power supply Vcc, the negative electrode of the 7th diode D7
It is connected to dropout magnetic flux power output end TVcc.First electric capacity C1 and the second electric capacity C2 forms filter circuit.3rd electric capacity C3 and
4th electric capacity C4 is connected across between magnetic flux power output end TVcc and ground, and the 3rd electric capacity C3 and the 4th electric capacity C4 is filter capacitor.
The filter circuit of the 3rd electric capacity C3 and the 4th electric capacity C4 composition dropout magnetic flux power output end TVcc, and the first electric capacity C1 and second
The filter circuit of electric capacity C2 composition power output end PVcc.Dropout magnetic flux power output end TVcc is the dropout in breaker of plastic casing
The flux guide of device provides drop away voltage.In a second embodiment, there are two outfan Pvcc and TVcc, therefore export electricity
The output on road 110 can be that the controller in breaker of plastic casing is powered and simultaneously for the magnetic flux control of the electrical apparatus release in breaker of plastic casing
Device processed provides drop away voltage.
In the selection of device model, the 5th diode D5, the model of the 6th diode D6 and the 7th diode D7 select
As the first diode D1, the second diode D4, M7 model can be selected.The capacitance that 3rd electric capacity C3 is is 100nF, the
The capacitance of four electric capacity C4 is 220uF.
In terms of operation principle, because the input circuit 102 in the second embodiment, switch combination circuit 104, feedback circuit
106 is identical with first embodiment with control circuit 108 with sampling, therefore the work process of the second embodiment and operation principle and the
One embodiment is identical, is not repeated to describe herein.
Sluggish type power circuit of the present utility model uses reference power supply chip substitution operation amplifier to produce control letter
Number so that circuit structure is simpler, and cost is lower.Feedback circuit is directly connected to feedback point and sampled point, to reference power supply core
Sheet feeds back, and circuit is simple but can increase the operation sluggishness type of reference power supply chip so that the control of reference power supply chip is more
Adding stable, capacity of resisting disturbance is higher.Configure big current power field effect transistor in circuit, can receive when the input of big electric current occurs
And consuming surplus power, protection back-end circuit is not by heavy current impact so that the upper limit of input current significantly improves.
On the whole, sluggish type power circuit volume of the present utility model is little, low cost, and device loss is little, service life
Long, and high-frequency electromagnetic interference can be reduced.
Above-described embodiment is available to be familiar with person in the art and realizes or use of the present utility model, is familiar with ability
The personnel in territory can in the case of without departing from utility model thought of the present utility model, above-described embodiment is made various modifications or
Change, thus protection domain of the present utility model is not limited by above-described embodiment, and should be to meet claims to mention
The maximum magnitude of inventive features.
Claims (12)
1. a sluggish type power circuit, it is characterised in that including:
Input circuit, input circuit is connected to power input, and input circuit carries out rectification to power supply input and provides input
Insulation blocking；
Switch combination circuit, switch combination circuit is connected to input circuit, and switch combination circuit is opened or turn off to control electricity
The output of source output terminal；
Sampling and control circuit, sampling and control circuit sampling and outputting voltage being compared with reference voltage by output voltage, sample
Opening or turning off of switch combination circuit is controlled according to result of the comparison with control circuit；
Feedback circuit, feedback circuit is connected between switch combination circuit and sampling and control circuit, and switch combination circuit is passed through
Feedback circuit exports positive feedback signal to sampling with control circuit, and positive feedback signal makes the comparison of reference power supply chip produce
Raw hesitation；
Output circuit, output circuit is connected to switch combination circuit, and the output of switch combination circuit is filtered by output circuit
And the insulation blocking of outfan is provided, the output of output circuit is as the output of sluggishness type power circuit.
2. sluggish type power circuit as claimed in claim 1, it is characterised in that described output circuit is output as moulding shell open circuit
Controller in device is powered.
3. sluggish type power circuit as claimed in claim 1, it is characterised in that described output circuit is output as moulding shell open circuit
The flux guide of the controller in device and the electrical apparatus release in breaker of plastic casing is powered.
4. sluggish type power circuit as claimed in claim 3, it is characterised in that
Described output circuit is also connected to auxiliary DC power supply；
Described output circuit include power input, auxiliary DC power supply and power output end, dropout magnetic flux power output end it
Between several paths.
5. the sluggish type power circuit as according to any one of claim 1-4, it is characterised in that in described switch combination circuit
Including field effect transistor and stabilivolt, by controlling opening or turn off and controlling power output end of field effect transistor and stabilivolt
Output.
6. sluggish type power circuit as claimed in claim 5, it is characterised in that described field effect transistor includes big current power field
Effect pipe.
7. sluggish type power circuit as claimed in claim 6, it is characterised in that described field effect transistor includes enhancement mode field effect
Pipe and big current power field effect transistor, the grid of big current power field effect transistor is connected with the drain electrode of enhancement mode field effect transistor, should
Point is as feedback point.
8. sluggish type power circuit as claimed in claim 7, it is characterised in that
Sampling and control circuit include reference power supply chip, and reference power supply chip produces reference voltage；
Sampling and control circuit according to result of the comparison control field effect transistor and stabilivolt in switch combination circuit open or
Turn off.
9. sluggish type power circuit as claimed in claim 8, it is characterised in that described sampling and control circuit include sampling electricity
Road, described sample circuit includes a pair sampling resistor, and the ratio of the resistance value of the pair of sampling resistor is 1:[(Vout/Vref)-
1], wherein Vout is output voltage, and Vref is reference voltage, is sampled point between this pair sampling resistor.
10. sluggish type power circuit as claimed in claim 9, it is characterised in that described feedback circuit is feedback resistance, described
Feedback resistance is connected between feedback point and sampled point, and described sampled point is connected to the reference edge of reference power supply chip.
11. sluggish type power circuits as claimed in claim 5, it is characterised in that described output circuit includes filter circuit.
12. sluggish type power circuits as claimed in claim 5, it is characterised in that wrap in described input circuit and output circuit
Include insulation blocking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620718741.8U CN205864260U (en) | 2016-07-08 | 2016-07-08 | Sluggish type power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620718741.8U CN205864260U (en) | 2016-07-08 | 2016-07-08 | Sluggish type power circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205864260U true CN205864260U (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620718741.8U Active CN205864260U (en) | 2016-07-08 | 2016-07-08 | Sluggish type power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026656A (en) * | 2016-07-08 | 2016-10-12 | 上海电科电器科技有限公司 | Hysteresis type power supply circuit |
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2016
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026656A (en) * | 2016-07-08 | 2016-10-12 | 上海电科电器科技有限公司 | Hysteresis type power supply circuit |
| WO2018006769A1 (en) * | 2016-07-08 | 2018-01-11 | 上海电科电器科技有限公司 | Hysteresis power supply circuit |
| CN106026656B (en) * | 2016-07-08 | 2019-01-25 | 上海电科电器科技有限公司 | Sluggish type power circuit |
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