CN208597029U - Switching power circuit and household electrical appliance - Google Patents
Switching power circuit and household electrical appliance Download PDFInfo
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- CN208597029U CN208597029U CN201820885648.5U CN201820885648U CN208597029U CN 208597029 U CN208597029 U CN 208597029U CN 201820885648 U CN201820885648 U CN 201820885648U CN 208597029 U CN208597029 U CN 208597029U
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Abstract
The utility model discloses a kind of switching power circuit and household electrical appliance, which includes ac power input end, rectifier circuit, input electrolytic capacitor, the current-limiting resistance for inhibiting surge current caused by input electrolytic capacitor when switching power circuit powers on and the ON-OFF control circuit for saving loss caused by current-limiting resistance when switching power circuit works normally；Ac power input end is connect with the first ac input end of rectifier circuit and the second ac input end respectively, the anode of the DC output end of rectifier circuit is connect with the anode of input electrolytic capacitor, the first end of the cathode and current-limiting resistance that input electrolytic capacitor connects, the cathode of the DC output end of the second end and rectifier circuit of current-limiting resistance is grounded, and ON-OFF control circuit is in parallel with current-limiting resistance.The utility model can be worked normally in time province's circuit in switching power circuit and is lost caused by current-limiting resistance, to improve the efficiency of Switching Power Supply.
Description
Technical field
The utility model relates to field of switch power more particularly to a kind of switching power circuits and household electrical appliance.
Background technique
Fig. 1 is the structural schematic diagram of one embodiment of input circuit of Switching Power Supply in household electrical appliance in the prior art, reference
Fig. 1, the input circuit of the Switching Power Supply of the household electrical appliance include the ac power input end 101, whole for input ac power
Flow bridge circuit 102, input electrolytic capacitor E and for inhibiting the input electrolytic capacitor E when the switching power circuit powers on
The current-limiting resistance R of generated surge current.Specifically, the ac power input end 101 respectively with the rectifier circuit
102 the first ac input end A1 and the second ac input end B1 connection, the DC output end of the rectifier circuit 102 is just
Pole "+" is connect with the first end of the current-limiting resistance R, and the second end of the current-limiting resistance R and the input electrolytic capacitor E are just
The anode of pole connection, the input electrolytic capacitor E is also connect with the subsequent conditioning circuit (not shown) of the Switching Power Supply, the input
The cathode "-" of the DC output end of the cathode of electrolytic capacitor E and the rectifier circuit 102 is grounded.The rectifier circuit
102 include first diode D1, the second diode D2, third diode D3 and the 4th diode D4.Wherein, the one or two pole
The anode of pipe D1 is connect with the cathode of the second diode D2, the cathode of the first diode D1 and the third diode
The cathode of D3 connects, and the anode of the third diode D3 is connect with the cathode of the 4th diode D4, the four or two pole
The anode of pipe D4 is connect with the anode of the second diode D2；The anode of the first diode D1 and second diode
The connecting node of the cathode of D2 is the first ac input end A1 of the rectifier circuit 102, the sun of the third diode D3
The connecting node of the cathode of pole and the 4th diode D4 is the second ac input end B1 of the rectifier circuit 102, institute
The connecting node of the cathode and the cathode of the third diode D3 of stating first diode D1 is the straight of the rectifier circuit 102
The positive "+" of output end is flowed, the connecting node of the anode and the anode of the 4th diode D4 of the second diode D2 is
The cathode "-" of the DC output end of the rectifier circuit 102.
As shown in Figure 1, when designing the Switching Power Supply of household electrical appliance, in order to inhibit the rectifier circuit 102 subsequent
The surge current input electrolytic capacitor E caused when Switching Power Supply powers on, usually can all seal in one in input circuit
The current-limiting resistance R (resistance value of the current-limiting resistance R is usually 10 ohm -39 ohm) of ten a few to tens of ohm, but should
Current-limiting resistance R can also introduce corresponding circuit loss when Switching Power Supply works normally, to reduce the efficiency of Switching Power Supply
(efficiency reduces about 2%-3% or so).Although there is no do explicitly the efficiency of Switching Power Supply in household electrical appliance for current various countries
Hard and fast rule, but the way for sacrificing switch power efficiency does not obviously meet the modern reason for advocating the low-power consumption of household electrical appliance high energy efficiency
It reads.
For example, it is assumed that the output power of Switching Power Supply is Po, efficiency η, the city that Switching Power Supply is inputted in household electrical appliance
Electric alternating voltage is Vac, the average voltage after mains voltage Vac is rectified are as follows: Vac*1.414*0.9, the then switch
The average current input I of power supplyavgAre as follows:
Again because directly connecing input electrolytic capacitor E (the opening in tens watts of household electrical appliance after the rectifier circuit 102
The powered-down typically no circuit of power factor correction in source), therefore approximate one of the input current of the power circuit only has about 20%
The triangular wave of time conducting, the peak point current I of the triangular wavepeakAre as follows:
It is possible thereby to which the virtual value for calculating the triangular wave is the effective current I of Switching Power Supply inputrmsAre as follows:
So on input circuit connect a current-limiting resistance R after, then the switching power circuit work normally when
Power loss P on the current-limiting resistance RRAre as follows:
Specifically, it is assumed that the output power of a Switching Power Supply is 10W, and the resistance value of efficiency 80%, current-limiting resistance R is
22 ohm, the mains voltage Vac of input is 220V, then the average current input of the Switching Power Supply can be obtained by above formula (1-1)
IavgAbout 44.6mA can be obtained the effective current I of Switching Power Supply input by above formula (1-3)rmsAbout 0.116A, by above formula (1-
It 4) can proper Switching Power Supply power loss P on current-limiting resistance R when working normallyRAbout 0.3W, and the power of this 0.3W
Loss is equivalent to the efficiency for having lost the Switching Power Supply about 3%.
Utility model content
The main purpose of the utility model is to provide a kind of switching power circuits, it is intended to save the switching power circuit
Loss caused by middle current-limiting resistance.
To achieve the goals above, the utility model provides a kind of switching power circuit, is used for household electrical appliance, the switch
Power circuit includes ac power input end, rectifier circuit, inputs electrolytic capacitor, for powering in the switching power circuit
When inhibit it is described input electrolytic capacitor caused by surge current current-limiting resistance and for the switching power circuit just
The ON-OFF control circuit being lost caused by the current-limiting resistance is often saved when work；Wherein:
The ac power input end exchanges input with the first ac input end of the rectifier circuit and second respectively
End connection, the anode of the DC output end of the rectifier circuit are connect with the anode of the input electrolytic capacitor, the input
The cathode of electrolytic capacitor is connect with the first end of the current-limiting resistance, the second end of the current-limiting resistance and the rectifier circuit
The cathode of DC output end be grounded, the ON-OFF control circuit is in parallel with the current-limiting resistance.
Preferably, the ON-OFF control circuit includes NMOS tube, first resistor, second resistance and control voltage input end；
Wherein:
The drain electrode of the NMOS tube is connect with the first end of the current-limiting resistance, the source electrode of the NMOS tube and the current limliting
The second end of resistance connects, the grid of the NMOS tube respectively with the first end of the first resistor and the second resistance the
One end connection, the second end ground connection of the first resistor, the second end of the second resistance and the control voltage input end connect
It connects.
Preferably, the resistance value of the resistance value of the first resistor and the second resistance is all larger than or equal to 1K ohm and is less than
Or it is equal to 1M ohm.
Preferably, the ON-OFF control circuit include NMOS tube, first resistor, second resistance, control voltage input end and
First capacitor；Wherein:
The drain electrode of the NMOS tube is connect with the first end of the current-limiting resistance, the source electrode of the NMOS tube and the current limliting
The second end of resistance connects, the grid of the NMOS tube respectively with the first end of the first resistor and the second resistance the
One end connection, the second end ground connection of the first resistor, the second end of the second resistance and the control voltage input end connect
It connects, the first capacitor is in parallel with the first resistor.
Preferably, the resistance value of the resistance value of the first resistor and the second resistance is all larger than or equal to 1K ohm and is less than
Or it is equal to 1M ohm, the capacitance of the first capacitor is greater than 0uF and is less than or equal to 10uF.
Preferably, the ON-OFF control circuit include relay, first resistor, second resistance, control voltage input end and
First capacitor；Wherein:
First contact of the switch of the relay is connect with the first end of the current-limiting resistance, the switch of the relay
The second contact connect with the second end of the current-limiting resistance, the first end of the coil of the relay respectively with it is described first electricity
The connection of the first end of the first end of resistance and the second resistance, the second end of the coil of the relay and the first resistor
Second end is grounded, and the second end of the second resistance is connect with the control voltage input end, the first capacitor with it is described
First resistor is in parallel.
Preferably, the resistance value of the resistance value of the first resistor and the second resistance is all larger than or equal to 1K ohm and is less than
Or it is equal to 1M ohm, the capacitance of the first capacitor is greater than 0uF and is less than or equal to 10uF.
Preferably, the rectifier circuit includes first diode, the second diode, third diode and the four or two pole
Pipe；Wherein:
The anode of the first diode is connect with the cathode of second diode, the cathode of the first diode with
The cathode of the third diode connects, and the anode of the third diode is connect with the cathode of the 4th diode, described
The anode of 4th diode is connect with the anode of second diode；
The connecting node of the cathode of the anode of the first diode and second diode is the rectifier circuit
The first ac input end, the connecting node of the anode of the third diode and the cathode of the 4th diode is described whole
Flow the second ac input end of bridge circuit, the connecting node of the cathode of the first diode and the cathode of the third diode
For the anode of the DC output end of the rectifier circuit, the anode of the anode of second diode and the 4th diode
Connecting node be the rectifier circuit DC output end cathode.
Preferably, the resistance value of the current-limiting resistance is greater than or equal to 10 ohm and is less than or equal to 39 ohm.
In addition, to achieve the above object, the utility model also provides a kind of household electrical appliance, the household electrical appliance include as above
The switching power circuit.
The utility model provides a kind of switching power circuit, which is used for household electrical appliance, the Switching Power Supply
Circuit includes ac power input end, rectifier circuit, inputs electrolytic capacitor, for the suppression when the switching power circuit powers on
Make the current-limiting resistance of surge current caused by the input electrolytic capacitor and in the normal work of the switching power circuit
As when save the ON-OFF control circuit being lost caused by the current-limiting resistance；The ac power input end respectively with it is described whole
Flow the first ac input end and the connection of the second ac input end of bridge circuit, the anode of the DC output end of the rectifier circuit
It is connect with the anode of the input electrolytic capacitor, the cathode of the input electrolytic capacitor and the first end of the current-limiting resistance connect
It connects, the cathode of the DC output end of the second end of the current-limiting resistance and the rectifier circuit is grounded, the switch control
Circuit is in parallel with the current-limiting resistance.The utility model switching power circuit is due to being provided with the ON-OFF control circuit, and institute
Loss caused by the current-limiting resistance can be saved when switching power circuit works normally by stating ON-OFF control circuit, to mention
The high efficiency of Switching Power Supply；Also, the utility model also has the advantages that at low cost, structure is simple and easily realizes.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of one embodiment of input circuit of Switching Power Supply in household electrical appliance in the prior art；
Fig. 2 is the structural schematic diagram of the utility model switching power circuit first embodiment；
Fig. 3 is the structural schematic diagram of the utility model switching power circuit second embodiment；
Fig. 4 is the structural schematic diagram of the utility model switching power circuit 3rd embodiment.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, without
It can be interpreted as its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include at least one of the features.In addition, between each embodiment
Technical solution can be combined with each other, but must based on can be realized by those of ordinary skill in the art, work as technical solution
Combination there is conflicting or cannot achieve when and will be understood that the combination of this technical solution is not present, it is also practical not new at this
Within the protection scope that type requires.
The utility model provides a kind of switching power circuit, and Fig. 2 is the utility model switching power circuit first embodiment
Structural schematic diagram, referring to Fig. 2, in the present embodiment, which includes ac power input end 201, rectifier bridge electricity
Road 202 inputs electrolytic capacitor E20, for inhibiting the input electrolytic capacitor E20 when the present embodiment switching power circuit powers on
The current-limiting resistance R20 of generated surge current and for the present embodiment switching power circuit work normally when save institute
State the ON-OFF control circuit 203 being lost caused by current-limiting resistance R20.
In the present embodiment, the ac power input end 201 exchanges input with the first of the rectifier circuit 202 respectively
Hold A2 and the second ac input end B2 connection, the positive "+" of the DC output end of the rectifier circuit 202 and input electricity
The anode connection of capacitor E20 is solved, the cathode of the input electrolytic capacitor E20 is connect with the first end of the current-limiting resistance R20,
The cathode "-" of the DC output end of the second end and rectifier circuit 202 of the current-limiting resistance R20 is grounded, described to open
It is in parallel with the current-limiting resistance R20 to close control circuit 203.
Specifically, in the present embodiment, the ON-OFF control circuit 203 includes NMOS tube Q21, first resistor R21, the second electricity
Hinder R22 and control voltage input end VC21.Specifically, the drain electrode of the NMOS tube Q21 and the first of the current-limiting resistance R20
End connection, the source electrode of the NMOS tube Q21 are connect with the second end of the current-limiting resistance R20, the grid point of the NMOS tube Q21
It is not connect with the first end of the first end of the first resistor R21 and the second resistance R22, the of the first resistor R21
Two ends ground connection, the second end of the second resistance R22 are connect with the control voltage input end VC21.
It is understood that the resistance value of the first resistor R21, the resistance value of the second resistance R22 and current limliting electricity
The resistance value of resistance R20 can be set according to the actual situation.In the present embodiment, the resistance value of the first resistor R21 and described
The resistance value of second resistance R22 is all larger than or is equal to 1K ohm and less than or equal to 1M ohm, and the resistance value of the current-limiting resistance R20 is big
In or be equal to 10 ohm and be less than or equal to 39 ohm.
In the present embodiment, the rectifier circuit 202 includes first diode D21, the second diode D22, the three or two pole
Pipe D23 and the 4th diode D24.Wherein, the cathode of the anode of the first diode D21 and the second diode D22 connect
It connects, the cathode of the first diode D21 is connect with the cathode of the three or two pole D23 pipe, the third diode D23's
Anode is connect with the cathode of the 4th diode D24, the anode of the 4th diode D24 and the second diode D22
Anode connection；The connecting node of the anode of the first diode D21 and the cathode of the second diode D22 is described whole
Flow the anode of the first ac input end A2, the third diode D23 of bridge circuit 202 and the yin of the 4th diode D24
The connecting node of pole is the second ac input end B2 of the rectifier circuit 202, the cathode of the first diode D21 and institute
State the cathode of third diode D23 connecting node be the rectifier circuit 202 DC output end positive "+", it is described
The connecting node of the anode of second diode D22 and the anode of the 4th diode D24 is the straight of the rectifier circuit 202
Flow the cathode "-" of output end.
The present embodiment is by the current-limiting resistance R20 and the subsequent input electrolytic capacitor E20 of the rectifier circuit 202
Series connection, the current-limiting resistance R20 can equally play the work for inhibiting surge current when the present embodiment switching power circuit powers on
With.In the present embodiment, the working principle of the ON-OFF control circuit 203 is described in detail below: in the present embodiment, the control electricity
Pressing the control voltage V1 of input terminal VC21 is its subsequent conditioning circuit (not shown) after being worked normally by the present embodiment switching power circuit
Generated control voltage V1.(the i.e. described input electrolytic capacitor E20 is filled after the completion of the present embodiment switching power circuit powers on
When full electricity), the control voltage V1 of the control voltage input end VC21 input passes through the first resistor R21 and described second
The partial pressure of resistance R22 is added to the grid of the NMOS tube Q21 to drive the NMOS tube Q21 to be connected, and is added in the NMOS tube
The relationship of the driving voltage Vgs of Q21 grid and the control voltage V1 are as follows:
Vgs=V1*R21/ (R21+R22), wherein Vgs is the driving voltage of the NMOS tube Q21 grid, and V1 is described
The control voltage that is inputted of control voltage input end VC21, R21 represent the resistance value of the first resistor R21, and R22 represents described the
The resistance value of two resistance R22.
After the NMOS tube Q21 conducting, on-state is presented in the drain electrode of the NMOS tube Q21 and source electrode, by the current-limiting resistance
R20 short circuit, to save circuit loss brought by the current-limiting resistance R20, and then improves the efficiency of Switching Power Supply.
The present embodiment switching power circuit is due to being provided with the ON-OFF control circuit 203, and the ON-OFF control circuit
The NMOS tube Q21 in 203 can be after the present embodiment switching power circuit normal work by the current-limiting resistance R20 short circuit
Fall, to save loss caused by the current-limiting resistance R21, and then the efficiency for improving Switching Power Supply (makes Switching Power Supply
Efficiency improve about 2%-3% or so)；Also, the present embodiment also has the advantages that at low cost, structure is simple and easily realizes.
Fig. 3 is the structural schematic diagram of the utility model switching power circuit second embodiment, and referring to Fig. 3, the present embodiment is opened
Powered-down source circuit is only that the structure of ON-OFF control circuit 303 in the present embodiment is different from the difference of above-mentioned first embodiment,
In the present embodiment, the ON-OFF control circuit 303 includes NMOS tube Q31, first resistor R31, second resistance R32, control voltage
Input terminal VC31 and first capacitor C31.Specifically, the drain electrode of the NMOS tube Q31 is connect with the first end of current-limiting resistance R30,
The source electrode of the NMOS pipe Q31 is connect with the second end of the current-limiting resistance R30, the grid of the NMOS tube Q31 respectively with institute
State the first end of first resistor R31 and the first end connection of the second resistance R32, the second termination of the first resistor R31
Ground, the second end of the second resistance R32 are connect with the control voltage input end VC31, the first capacitor C31 with it is described
First resistor R31 is in parallel.
Similarly, in the present embodiment, the resistance value of the first resistor R31, the resistance value of the second resistance R32, the current limliting
The resistance value of resistance R30 and the capacitance of the first capacitor C31 can be set according to the actual situation.In the present embodiment,
The resistance value of the first resistor R31 and the resistance value of the second resistance R32 are all larger than or are equal to 1K ohm and be less than or equal to 1M
Ohm, the resistance value of the current-limiting resistance R30 are greater than or equal to 10 ohm and are less than or equal to 39 ohm, the first capacitor C31
Capacitance be greater than 0uF and be less than or equal to 10uF.
The ON-OFF control circuit 303 in the present embodiment is relative to the ON-OFF control circuit in above-mentioned first embodiment
203, be additionally arranged the first capacitor C31 in the ON-OFF control circuit 303 in the present embodiment, the first capacitor C31 with
The first resistor R31 is in parallel, and the first capacitor C31 in the present embodiment can be played described in delayed start-up or closing
The effect of NMOS tube Q31.It should be noted that the circuit structure of other components, circuit operation principle and having in the present embodiment
Beneficial effect is identical as above-mentioned first embodiment, and details are not described herein again.
Fig. 4 is the structural schematic diagram of the utility model switching power circuit 3rd embodiment, and referring to Fig. 4, the present embodiment is opened
Powered-down source circuit is only that the structure of ON-OFF control circuit 403 in the present embodiment is different from the difference of above-mentioned first embodiment,
In the present embodiment, the ON-OFF control circuit 403 includes relay 4031, first resistor R41, second resistance R42, control voltage
Input terminal VC41 and first capacitor C41.Wherein, the first contact of the switch (not shown) of the relay 4031 and the current limliting
The first end of resistance R40 connects, and the second end of the second contact of the switch of the relay 4031 and the current-limiting resistance R40 connect
Connect, the first end of the coil (not shown) of the relay 4031 respectively with the first end of the first resistor R41 and described
The first end of two resistance R42 connects, and the second end of the second end of the coil of the relay 4031 and the first resistor R41 are equal
Ground connection, the second end of the second resistance R42 are connect with the control voltage input end VC41, the first capacitor C41 and institute
It is in parallel to state first resistor R41.
Similarly, in the present embodiment, the resistance value of the first resistor R41, the resistance value of the second resistance R42, the current limliting
The resistance value of resistance R40 and the capacitance of the first capacitor C41 can be set according to the actual situation.In the present embodiment,
The resistance value of the first resistor R41 and the resistance value of the second resistance R42 are all larger than or are equal to 1K ohm and be less than or equal to 1M
Ohm, the resistance value of the current-limiting resistance R40 are greater than or equal to 10 ohm and are less than or equal to 39 ohm, the first capacitor C41
Capacitance be greater than 0uF and be less than or equal to 10uF.
The ON-OFF control circuit 403 in the present embodiment is relative to the ON-OFF control circuit in above-mentioned first embodiment
203, be additionally arranged the first capacitor C41 in the ON-OFF control circuit 403 in the present embodiment, the first capacitor C41 with
First resistor R41 is in parallel, and the first capacitor C41 in the present embodiment can play delayed start-up or close the relay
4031 effect, and the switching device used in the present embodiment not instead of NMOS tube, the relay 4031, the relay
The current-limiting resistance R40 short circuit is saved the current-limiting resistance to realize by two contacts of its switch when device 4031 is attracted
The purpose being lost caused by R40.The present embodiment deducts the loss of the coil of the relay 4031 itself, can equally play
Save the effect of partition losses.It should be noted that the circuit structure of other components in the present embodiment, circuit operation principle and
Beneficial effect is identical as above-mentioned first embodiment, and details are not described herein again.
The utility model also provides a kind of household electrical appliance, as electromagnetic oven, electric cooker, electric pressure cooking saucepan, wall-breaking machine, soy bean milk making machine,
Juice extractor, bread producing machine or coffee machine, the household electrical appliance include switching power circuit, and the structure of the switching power circuit can refer to
Above-described embodiment, details are not described herein.Naturally, since the household electrical appliance of the present embodiment use above-mentioned switch power supply
The technical solution on road, therefore the beneficial effect that the household electrical appliance have above-mentioned switching power circuit all.
The above is only the preferred embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of switching power circuit is used for household electrical appliance, which is characterized in that the switching power circuit includes that AC power source is defeated
Enter end, rectifier circuit, input electrolytic capacitor, for inhibiting the input electrolytic capacitor when the switching power circuit powers on
The current-limiting resistance of generated surge current and for saving current limliting electricity when the switching power circuit works normally
The ON-OFF control circuit being lost caused by resistance；Wherein:
The ac power input end connects with the first ac input end of the rectifier circuit and the second ac input end respectively
It connects, the anode of the DC output end of the rectifier circuit is connect with the anode of the input electrolytic capacitor, the input electrolysis
The cathode of capacitor is connect with the first end of the current-limiting resistance, the second end of the current-limiting resistance and the rectifier circuit it is straight
The cathode of stream output end is grounded, and the ON-OFF control circuit is in parallel with the current-limiting resistance.
2. switching power circuit as described in claim 1, which is characterized in that the ON-OFF control circuit includes NMOS tube,
One resistance, second resistance and control voltage input end；Wherein:
The drain electrode of the NMOS tube is connect with the first end of the current-limiting resistance, the source electrode of the NMOS tube and the current-limiting resistance
Second end connection, the grid of the NMOS tube first end with the first end of the first resistor and the second resistance respectively
Connection, the second end ground connection of the first resistor, the second end of the second resistance are connect with the control voltage input end.
3. switching power circuit as claimed in claim 2, which is characterized in that the resistance value of the first resistor and second electricity
The resistance value of resistance is all larger than or is equal to 1K ohm and is less than or equal to 1M ohm.
4. switching power circuit as described in claim 1, which is characterized in that the ON-OFF control circuit includes NMOS tube,
One resistance, second resistance, control voltage input end and first capacitor；Wherein:
The drain electrode of the NMOS tube is connect with the first end of the current-limiting resistance, the source electrode of the NMOS tube and the current-limiting resistance
Second end connection, the grid of the NMOS tube first end with the first end of the first resistor and the second resistance respectively
Connection, the second end ground connection of the first resistor, the second end of the second resistance are connect with the control voltage input end, institute
It is in parallel with the first resistor to state first capacitor.
5. switching power circuit as claimed in claim 4, which is characterized in that the resistance value of the first resistor and second electricity
The resistance value of resistance is all larger than or is equal to 1K ohm and is less than or equal to 1M ohm, and the capacitance of the first capacitor is greater than 0uF and small
In or equal to 10uF.
6. switching power circuit as described in claim 1, which is characterized in that the ON-OFF control circuit includes relay,
One resistance, second resistance, control voltage input end and first capacitor；Wherein:
First contact of the switch of the relay is connect with the first end of the current-limiting resistance, and the of the switch of the relay
Two contacts are connect with the second end of the current-limiting resistance, the first end of the coil of the relay respectively with the first resistor
The connection of the first end of first end and the second resistance, the second of the second end of the coil of the relay and the first resistor
End is grounded, and the second end of the second resistance is connect with the control voltage input end, the first capacitor and described first
Resistor coupled in parallel.
7. switching power circuit as claimed in claim 6, which is characterized in that the resistance value of the first resistor and second electricity
The resistance value of resistance is all larger than or is equal to 1K ohm and is less than or equal to 1M ohm, and the capacitance of the first capacitor is greater than 0uF and small
In or equal to 10uF.
8. the switching power circuit as described in any one of claims 1 to 7, which is characterized in that the rectifier circuit includes
First diode, the second diode, third diode and the 4th diode；Wherein:
The anode of the first diode is connect with the cathode of second diode, the cathode of the first diode with it is described
The cathode of third diode connects, and the anode of the third diode is connect with the cathode of the 4th diode, and the described 4th
The anode of diode is connect with the anode of second diode；
The connecting node of the cathode of the anode of the first diode and second diode is the of the rectifier circuit
The connecting node of the cathode of one ac input end, the anode of the third diode and the 4th diode is the rectifier bridge
The connecting node of the cathode of second ac input end of circuit, the cathode of the first diode and the third diode is institute
State the anode of the DC output end of rectifier circuit, the company of the anode of second diode and the anode of the 4th diode
Connect the cathode for the DC output end that node is the rectifier circuit.
9. the switching power circuit as described in any one of claims 1 to 7, which is characterized in that the resistance value of the current-limiting resistance
More than or equal to 10 ohm and it is less than or equal to 39 ohm.
10. a kind of household electrical appliance, which is characterized in that the household electrical appliance include switch described in any one of claims 1 to 9
Power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820885648.5U CN208597029U (en) | 2018-06-07 | 2018-06-07 | Switching power circuit and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820885648.5U CN208597029U (en) | 2018-06-07 | 2018-06-07 | Switching power circuit and household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208597029U true CN208597029U (en) | 2019-03-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820885648.5U Active CN208597029U (en) | 2018-06-07 | 2018-06-07 | Switching power circuit and household electrical appliance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
-
2018
- 2018-06-07 CN CN201820885648.5U patent/CN208597029U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737360A (en) * | 2020-12-29 | 2021-04-30 | 上海骄成机电设备有限公司 | Rectifying circuit and power supply |
| CN112737360B (en) * | 2020-12-29 | 2022-07-05 | 上海骄成超声波技术股份有限公司 | Rectifying circuit and power supply |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
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