CN105978364B - Power control system - Google Patents
Power control system Download PDFInfo
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- CN105978364B CN105978364B CN201511032487.2A CN201511032487A CN105978364B CN 105978364 B CN105978364 B CN 105978364B CN 201511032487 A CN201511032487 A CN 201511032487A CN 105978364 B CN105978364 B CN 105978364B
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- circuit
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- inductance
- control system
- power source
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The disclosure discloses a kind of power control system, belongs to smart home field.The power control system includes：Switching power source chip, inductance, control circuit, first switch, second switch, functional circuit and load circuit.When control circuit is in off state by the control terminal control first switch of first switch, it is in the conductive state to control second switch, so that the power that the load circuit being connected with second switch replaces the functional circuit being connected with first switch consumption switching power source chip to provide, guarantees that the switching frequency in switching power source chip is not less than preset threshold；It solves the coil under lower switching frequency in inductance and can generate magnetic force and to collide between coil, to generate the noise problem that human ear can be heard；Reach the power for replacing functional circuit consumption switching power source chip to provide using load circuit, improved the switching frequency in switching power source chip, reduces the effect for the noise that the coil in inductance generates.
Description
Technical field
This disclosure relates to smart home field, in particular to a kind of power control system.
Background technique
Switching Power Supply is the power supply circuit that direct current is converted alternating current to by the quick on-off of switching tube.The switching tube
With certain switching frequency.
The power control system that the relevant technologies provide, including：Switching power source chip passes through inductance and switching power source chip phase
Control circuit even, the functional circuit being connected by inductance with switching power source chip.Wherein, switching power source chip is used for the side of output
Wave supply current, inductance are used to convert direct current supply electric current for the square wave supply current that switching power source chip is exported.Inductance
Switch is additionally provided between functional circuit, the control terminal of the switch is connected with control circuit.Control circuit passes through to the switch
Control, realize opening and closing to functional circuit.Wherein switching power source chip and inductor combination form Switching Power Supply.Than
Such as, when control circuit is to control terminal output logic signal 1, switch conduction, functional circuit is opened；For another example, control circuit is to control
When end output logic signal 0 processed, switch cut-off, functional circuit is closed.Functional circuit is for realizing predetermined function, such as in intelligence
In electric light, functional circuit can be LED illuminating circuit.
Under low-power consumption mode, such as the pent mode of functional circuit, Switching Power Supply needs to reduce switching frequency, but by
There are certain gaps between coil in above-mentioned inductance, and the coil under lower switching frequency in inductance can generate magnetic force
So that being collided between coil, to generate the noise that human ear can be heard.
Summary of the invention
Magnetic force can be generated in order to solve the coil under lower switching frequency in inductance to collide between coil,
To lead to the problem of the noise that human ear can be heard, the disclosure provides a kind of power control system.The technical solution is as follows：
According to the first aspect of the embodiments of the present disclosure, a kind of power control system is provided, which includes：
Switching power source chip, for exporting supply current by output end；
Inductance, the first end of inductance are connected with the output end of switching power source chip, and the second end of inductance is electric with control respectively
Road, first switch and the second switch are connected；
Control circuit is also connected with the control terminal of the control terminal of first switch and second switch respectively, and control circuit is used for
One controlled in first switch and the second switch under same operation time is in the conductive state；
First switch is also connected with functional circuit, and functional circuit is for providing the operating circuit of predetermined function；
Second switch is also connected with load circuit, and load circuit is used to make switching power source chip when functional circuit is closed
In switching frequency be not less than preset threshold.
Optionally, control circuit is Wireless Fidelity WiFi control circuit.
Optionally, functional circuit includes light socket circuit, MP3 socket circuit, MP4 socket circuit, smart phone socket
Circuit, the display screen circuit of washing machine, the display screen circuit of refrigerator, the display screen circuit of electric cooker, the display screen of air-conditioning are electric
Road, electronic scale display screen circuit in any one.
Optionally, load circuit includes the first power consumption resistance, and one end of the first power consumption resistance is connected with second switch, and first
The other end of power consumption resistance is grounded.
Optionally, switching power source chip is non-isolation type switch power.
Optionally, first switch includes triode, field-effect tube, any one in single-pole double-throw switch (SPDT).
Optionally, second switch includes triode, field-effect tube, any one in single-pole double-throw switch (SPDT).
Optionally, power control system further includes rc filter circuit, and the second end of inductance is arranged in rc filter circuit
Between functional circuit.
Optionally, rc filter circuit include the first filter capacitor and the second filter capacitor, the first of the first filter capacitor
End is connected with the second end of inductance, the second end ground connection of the first filter capacitor；The of the first end of second filter capacitor and inductance
Two ends are connected, the second end ground connection of the second filter capacitor.
Optionally, power control system further includes protection circuit, and protection circuit is connected with the second end of inductance.
Optionally, protection circuit includes protective resistance, and protective resistance is connected with the second end of inductance, the first protective resistance
Second end ground connection.
The technical scheme provided by this disclosed embodiment can include the following benefits：
By the way that second switch is arranged in control circuit, when control circuit is opened by the control terminal control first of first switch
It is in the conductive state by the control terminal control second switch of second switch when closing in off state, so that and second switch
The power that connected load circuit replaces the functional circuit being connected with first switch consumption switching power source chip to provide, guarantees switch
Switching frequency in power supply chip is not less than preset threshold；Solving the coil under lower switching frequency in inductance can generate
Magnetic force to collide between coil, to generate the noise problem that human ear can be heard；Reach and has utilized load circuit generation
For the power that functional circuit consumption switching power source chip provides, so that the switching frequency in switching power source chip is not less than default threshold
It is worth, the coil in inductance will not generate the effect for the noise that human ear can be heard.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
It is open.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and consistent with the instructions for explaining the principles of this disclosure.
Fig. 1 is a kind of structural schematic diagram of power control system shown according to an exemplary embodiment；
Fig. 2 is a kind of structural schematic diagram of the power control system shown according to another exemplary embodiment；
Fig. 3 is a kind of circuit signal of switching power source chip and inductance conversion electric current shown according to an exemplary embodiment
Figure；
Fig. 4 is the circuit connection diagram of first switch shown according to an exemplary embodiment；
Fig. 5 is the circuit connection diagram of second switch shown according to an exemplary embodiment；
Fig. 6 is a kind of structural schematic diagram of power control system shown according to another exemplary embodiment；
Fig. 7 is the circuit connection that a kind of power control system shown according to an exemplary embodiment is applied to light socket
Schematic diagram.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Fig. 1 is a kind of structural schematic diagram of power control system 100 shown according to an exemplary embodiment.Such as Fig. 1 institute
Show, which may include：Switching power source chip 110, inductance 120, control circuit 130, functional circuit 140
With load circuit 150.
Switching power source chip 110, for exporting supply current by output end.
A switching tube, the conducting that switching power source chip 110 passes through control switch pipe are provided in switching power source chip 110
With the frequency (full text abbreviation switching frequency) of cut-off, carry out the size of the supply current of control output end output.Switching power source chip
The size direct proportionality of 110 switching frequency and the supply current of output, switching frequency is higher, the power supply of output end output
Electric current is bigger.
The first end of inductance 120 is connected with the output end of switching power source chip 110, the second end of inductance 120 respectively with control
Circuit 130 processed, first switch 131 are connected with second switch 132.
Wherein, switching power source chip 110 and the combination of inductance 120 form Switching Power Supply 160.
Control circuit 130 is also connected with the control terminal of the control terminal of first switch 131 and second switch 132 respectively, control
Circuit 130 is in the conductive state for controlling one in first switch 131 and second switch 132 under same operation time.
First switch 131 is also connected with functional circuit 140, and functional circuit 140 is for providing the work electricity of predetermined function
Road.
Second switch 132 is also connected with load circuit 150, and load circuit 150 is used to make when functional circuit 140 is closed
Switching frequency in switching power source chip 110 is not less than preset threshold.
In Fig. 1, the first end of control circuit 130 is connected with the second end of inductance 120, the second end point of control circuit 130
It is not connected with the control terminal of the control terminal of first switch 131 and second switch 132.
The first end of first switch 131 is connected with the second end of inductance 120, the control terminal and control electricity of first switch 131
The second end on road 130 is connected, and the second end of first switch 131 is connected with functional circuit 140.
The first end of second switch 132 is connected with the second end of inductance 120, the control terminal and control electricity of second switch 132
The second end on road 130 is connected, and the second end of second switch 132 is connected with load circuit 150.
The first end of load circuit 150 is connected with the second end of second switch 132, the second end ground connection of load circuit 150.
Wherein, control circuit 130 is by controlling first switch 131 to the control terminal output logic signal of first switch 131
Working condition；Control circuit 130 is by controlling second switch 132 to the control terminal output logic signal of second switch 132
Working condition.Under same operation time, control circuit 130 controls first switch 131 and second by output logic signal and opens
One closed in 132 is in the conductive state, another is in off state.
Such as：Control terminal output logic signal 1 from control circuit 130 to first switch 131 when, first switch 131 be connected,
The functional circuit 140 being connected with the second end of first switch 131 is opened；The control terminal of control circuit 130 to first switch 131 is defeated
Out when logical signal 0, first switch 131 is ended, and the functional circuit 140 being connected with the second end of first switch 131 is closed.
For another example：Control terminal output logic signal 1 from control circuit 130 to second switch 132 when, second switch 132 is cut
Only, the load circuit 150 being connected with the second end of second switch 132 is closed；Control of the control circuit 130 to second switch 132
When holding output logic signal 0, second switch 132 is connected, and the load circuit 150 being connected with the second end of second switch 132 is opened.
Optionally, in same operation time, control terminal and second switch 132 of the control circuit 130 to first switch 131
The logical signal of control terminal output is identical.
Such as：The logic that control circuit 130 is exported to the control terminal of first switch 131 and the control terminal of second switch 132
When signal 1, first switch 131 is connected, and second switch 132 ends, the functional circuit being connected with the second end of first switch 131
140 open, and the load circuit 150 being connected with the second end of second switch 132 is closed；Control circuit 130 is to first switch 131
When control terminal and the logical signal 0 of the control terminal of second switch 132 output, first switch 131 is ended, and second switch 132 is connected,
The functional circuit 140 being connected with the second end of first switch 131 is closed, the load electricity being connected with the second end of second switch 132
It opens on road 150.
The control terminal output logic signal that control circuit 130 passes through control terminal and second switch 132 to first switch 131
The opening and closing of control function circuit 140 and load circuit 150.
While control circuit 130 is closed by logical signal control function circuit 140, controlled by logical signal negative
It carries circuit 150 to open, replaces functional circuit 140 to consume the power supply electricity that switching power source chip 110 provides using load circuit 150
Stream, so that the switching frequency in switching power source chip 110 is not less than preset threshold.
It should be noted is that the power that load circuit 150 consumes is far smaller than the power of the consumption of functional circuit 140,
It replaces functional circuit 140 to consume the power that switching power source chip 110 provides using load circuit 150, is intended merely to control switch
Switching frequency in power supply chip 110 is not less than predetermined threshold.
It needs to illustrate on the other hand, with control terminal from control circuit 130 to first switch 131 and second switch in Fig. 1
132 control terminal output logical signal it is identical for illustrate, but the embodiment of the present disclosure to control circuit 130 to
Whether the logical signal that the control terminal of first switch 131 and the control terminal of second switch 132 export does not constitute restriction identical, controls
Circuit 130 can not be identical to the logical signal that the control terminal of first switch 131 and the control terminal of second switch 132 export, only
One that control circuit 130 controls in first switch 131 and second switch 132 under same operation time need to be met to be on
State, another is in off state.
In conclusion power control system provided in this embodiment works as control by the way that second switch is arranged in control circuit
When circuit processed is in off state by the control terminal control first switch of first switch, the control terminal for passing through second switch is controlled
Second switch is in the conductive state, so that the load circuit being connected with second switch replaces the functional circuit being connected with first switch
The power that switching power source chip provides is consumed, guarantees that the switching frequency in switching power source chip is not less than preset threshold；It solves
Coil under lower switching frequency in inductance can generate magnetic force and to collide between coil, so that generating human ear can be with
The noise problem heard；The power for replacing functional circuit consumption switching power source chip to provide using load circuit is reached, has improved
Switching frequency in switching power source chip reduces the effect for the noise that the coil in inductance generates.
Fig. 2 is a kind of structural schematic diagram of the power control system 200 shown according to another exemplary embodiment, such as Fig. 2
Shown, which may include：Switching power source chip 210, inductance 220, control circuit 230, functional circuit
240 and load circuit 250.
Switching power source chip 210, for exporting supply current by output end.
Be provided with a switching tube in switching power source chip 210, switching power source chip 210 by the conducting of control switch pipe and
The frequency of cut-off carrys out the size of the supply current of control output end output.The switching frequency of switching power source chip 210 and output
The size direct proportionality of supply current, switching frequency is higher, and the supply current of output end output is bigger.
Wherein, switching power source chip 210 is non-isolation type switch power.
Optionally, switching power source chip 210 can also be AC (Alternating Current, exchange)-DC (Direct
Current, direct current) type Switching Power Supply or PWM type Switching Power Supply.
The first end of inductance 220 is connected with the output end of switching power source chip 210, the second end of inductance 220 respectively with control
Circuit 230 processed, first switch 231 are connected with second switch 232.
Switching power source chip 210 combines inductance 220 to convert direct current supply electric current for the alternating current of input.
Wherein, switching power source chip 210 and the combination of inductance 220 form Switching Power Supply 260.
Such as：Switching power source chip 210 converts alternating current in conjunction with inductance 220 circuit diagram such as Fig. 3 of DC current
It is shown.
In Fig. 3, the alternating current of input is first passed around into rectification circuit 211, rectification circuit 211 is used for the exchange that will be inputted
Electric current is converted into the DC current of output.Include in rectification circuit 211：AC-DC rectifier bridge 23, the pin 3 of AC-DC rectifier bridge 23
With the alternating current of the access input of pin 4, the pin 1 and pin 2 of AC-DC rectifier bridge 23 export the DC current after conversion.It can
Choosing, rectification circuit 211 further includes the first peripheral circuit 212, include in first peripheral circuit 212 resistance R3, resistance R12,
Polar capacitor C6, stabilizing inducatnce 24 and polar capacitor C13.Wherein, alternating current is accessed between input terminal 21 and input terminal 22, it is defeated
Entering end 21 to be connected with the first end of resistance R3, the second end of resistance R3 is connected with the first end of resistance R12, and the second of resistance R12
End is connected with input terminal 22；The second end of resistance R3 is connected with the pin 4 of AC-DC rectifier bridge 23, and input terminal 22 and AC-DC are rectified
The pin 3 of bridge 23 is connected.It is connected in the pin 1 of AC-DC rectifier bridge 23 with the anode of polar capacitor C6, the cathode of polar capacitor C6
Ground connection.The pin 1 of AC-DC rectifier bridge 23 is also connected with the first end of stabilizing inducatnce 24, the second end and polarity of stabilizing inducatnce 24
The anode of capacitor C13 is connected, the cathode ground connection of polar capacitor C13.Resistance R3 and resistance R12 is for protecting circuit, AC-DC rectification
Bridge 23 is used to convert the alternating current of input to DC current, and stabilizing inducatnce 24 is used to stablize the straight of AC-DC rectifier bridge output
Galvanic electricity stream.
In Fig. 3, using the electric current after the conversion of rectification circuit 211 as the input of switching power source chip 210.Switching Power Supply
Chip 210 includes power supply chip U2, wherein power supply chip U2 includes 5 pins, respectively VCC, FB, DRAIN and two
SOURCE pin.VCC pin 1 is used to provide electric current to power supply chip U2 itself；FB pin 2 is used for the mistake of out-put supply chip U2
Feedback is carried, that is, when the switching frequency of power supply chip U2 and peak point current all reach maximum, if continuing growing load, FB
The output voltage of power supply chip U2 can be reduced；DRAIN pin 5 is the drain electrode of the power MOS pipe inside power supply chip U2,
It is the input of current source；SOURCE pin 3 and SOURCE pin 4 are the source electrodes of the power MOS pipe inside power supply chip U2, as
The reference of VCC pin and FB pin exports, for exporting supply current.Optionally, the power MOS pipe inside power supply chip U2 is
Refer to the switching tube in switching power source chip 210.
Optionally, further include having the second peripheral circuit 213 in switching power source chip 210, include in the second peripheral circuit 213
Capacitor C1, capacitor C2, capacitor C3, polar capacitor C18, resistance R5, resistance R7, diode D102 and diode D1.
In Fig. 3, switching power source chip 210 and the circuit connection of the second peripheral circuit 213 are as follows：The second of stabilizing inducatnce 24
End is also connected with the DRAIN pin 5 of power supply chip U2, and the VCC pin 1 of power supply chip U2 is connected with the first end of capacitor C1, electricity
The second end for holding C1 is connected with the SOURCE pin 3 of power supply chip U2, the SOURCE pin 3 and SOURCE pin of power supply chip U2
4 are connected, and the FB pin 2 of power supply chip U2 is connected with the first end of capacitor C2, and the second end of capacitor C2 is with power supply chip U2's
SOURCE pin 3 is connected, and the FB pin 2 of power supply chip U2 is connected with the first end of the first end of resistance R5 and resistance R7 respectively,
The second end of resistance R7 is connected with the closed one end diode D102, one end ground connection of diode D102 opening, and the of resistance R5
Two ends are connected with the first end of capacitor C3 and the closed one end diode D1 respectively, and the second end of capacitor C3 is with power supply chip U2's
SOURCE pin 3 is connected, and one end of diode D1 opening is connected with the anode of polar capacitor C18, and the cathode of polar capacitor C18 connects
Ground.
In Fig. 3, the electric current after switching power source chip 210 converts is input in inductance 220, after converting in conjunction with inductance 220
Current transformation be direct current supply electric current.Wherein, inductance 220 includes：Inductance L3, inductance L3 are used for switching power source chip 210
The pulse current of input converts direct current supply electric current.
Optionally, inductance 220 further includes having third peripheral circuit 214, which includes capacitor C4 and electricity
Hinder R11.
In Fig. 3, inductance 220 and the circuit connection of third peripheral circuit 214 are as follows：The SOURCE pin 3 of power supply chip U2
Continue to be connected with the first end of inductance L3 after being connected with capacitor C3, the second end of inductance L3 respectively with the first end of capacitor C4 and
The first end of resistance R11 is connected；The second end of capacitor C4 is grounded, the second end ground connection of resistance R11.It is converted by the circuit of Fig. 3
Afterwards, the direct current supply electric current that switching power source chip 210 provides can be drawn from the first end of resistance R11.
The entire conversion process of circuit diagram shown in Fig. 3 is as follows：It is assumed that the alternating voltage of 220V is inputted from input terminal 21, warp
The DC voltage that AC-DC rectifier bridge 23 is converted into 370V is crossed, in input switch power supply chip 210, by switching power source chip 210
Effect with capacitor C1, capacitor C2 and capacitor C3 converts the DC voltage of 370V to the pulse voltage of 12V, using inductance
After 220, direct current supply electric current is converted by the pulse current that the pulse voltage of 12V generates.
Control circuit 230 is also connected with the control terminal of the control terminal of first switch 231 and second switch 232 respectively, control
Circuit 230 is in the conductive state for controlling one in first switch 231 and second switch 232 under same operation time.
Optionally, control circuit 230 is WiFi (Wireless Fidelity, Wireless Fidelity) control circuit 233.WiFi
Control circuit 233 refers to that electronic equipment sends control signal to first switch 231 and second switch 232 by WiFi module, from
And control the circuit of the working condition of first switch 231 and second switch 232.
Control circuit 230 controls one in first switch 231 and second switch 232 in same operation time and is on
State, another is in close state.
First switch 231 is also connected with functional circuit 240, and functional circuit 240 is for providing the work electricity of predetermined function
Road.
Optionally, first switch 231 includes any one in triode, field-effect tube, single-pole double-throw switch (SPDT).
For example, first switch 231 is triode 40, then the base stage 41 of triode 40 is connected with control circuit 230, triode
40 collector 42 is connected with inductance 220, and the emitter 43 of triode 40 is connected with functional circuit 240, as shown in Figure 4.
Optionally, functional circuit 240 is inserted including light socket circuit, MP3 socket circuit, MP4 socket circuit, smart phone
Seat circuit, the display screen circuit of washing machine, the display screen circuit of refrigerator, the display screen circuit of electric cooker, air-conditioning display screen
Circuit, electronic scale display screen circuit in any one.
Functional circuit 240 is for providing the operating circuit of predetermined function.Such as：Functional circuit 240 is light socket circuit,
Then functional circuit 240 can be light socket circuit, then functional circuit 240 can provide the DC current of needs for electric light.
Second switch 232 is also connected with load circuit 250, and load circuit 250 is used to make when functional circuit 240 is closed
Switching frequency in switching power source chip 210 is not less than preset threshold.
Optionally, second switch 232 includes any one in triode, field-effect tube, single-pole double-throw switch (SPDT).
For example, second switch 232 is triode 50, then the base stage 51 of triode 50 is connected with control circuit 230, triode
50 collector 52 is connected with inductance 220, and the emitter 53 of triode 50 is connected with load circuit 250, as shown in Figure 5.
Optionally, load circuit 250 includes the first power consumption resistance 251.
The first end of first power consumption resistance 251 is connected with second switch 232, the second end ground connection of the first power consumption resistance 251.
In Fig. 2, the first end of control circuit 230 is connected with the second end of inductance 220, the second end point of control circuit 230
It is not connected with the control terminal of the control terminal of first switch 231 and second switch 232.
The first end of first switch 231 is connected with the second end of inductance 220, the control terminal and control electricity of first switch 231
The second end on road 230 is connected, and the second end of first switch 231 is connected with functional circuit 240.
The first end of second switch 232 is connected with the second end of inductance 220, the control terminal and control electricity of second switch 232
The second end on road 230 is connected, and the second end of second switch 232 is connected with load circuit 250.
Wherein, control circuit 230 is by controlling first switch 231 to the control terminal output logic signal of first switch 231
Working condition；Control circuit 230 is by controlling second switch 232 to the control terminal output logic signal of second switch 232
Working condition.Under same operation time, control circuit 230 controls first switch 231 and second by output logic signal and opens
One closed in 232 is in the conductive state, another is in off state.
Such as：It is assumed that first switch 231 is triode 40 and second switch 232 is triode 50.Control circuit 230 to three
When 40 output logic signal 1 of pole pipe, triode 40 is in the conductive state, and the functional circuit 240 being connected with triode 40 is opened；Control
When circuit 230 processed is to 40 output logic signal 0 of triode, triode 40 is in off state, the function being connected with triode 40
Circuit 240 is closed.
For another example：When control circuit 230 is to 50 output logic signal 1 of triode, triode 50 is in cut-off, with triode
50 connected load circuits 250 are closed；When control circuit 230 is to 50 output logic signal 0 of triode, triode 50 is on
State, the load circuit 250 being connected with triode 50 are opened.
In same operation time, the logical signal that control circuit 230 is exported to triode 40 and triode 50 is identical.
Such as：When the logical signal 1 that control circuit 230 is exported to triode 40 and triode 50, triode 40 is in and leads
Logical state, triode 50 are in off state, and the functional circuit 240 being connected with triode 40 is opened, and are connected with triode 50
Load circuit 250 is closed；When the logical signal 0 that control circuit 230 is exported to triode 40 and triode 50, triode 40 is in
Off state, triode 50 is in the conductive state, and the functional circuit 240 being connected with triode 40 is closed, and is connected with triode 50
Load circuit 250 open.
The control terminal output logic signal that control circuit 230 passes through control terminal and second switch 232 to first switch 231
The opening and closing of control function circuit 240 and load circuit 250.
While control circuit 230 is closed by logical signal control function circuit 240, controlled by logical signal negative
It carries circuit 250 to open, replaces functional circuit 240 to consume the power supply electricity that switching power source chip 210 provides using load circuit 250
Stream, so that the switching frequency in switching power source chip 210 is not less than preset threshold.
It should be noted is that the power that load circuit 250 consumes is far smaller than the power of the consumption of functional circuit 240,
It replaces functional circuit 240 to consume the power that switching power source chip 210 provides using load circuit 250, is intended merely to control switch
Switching frequency in power supply chip 210 is not less than predetermined threshold.
It needs to illustrate on the other hand, with control terminal from control circuit 230 to first switch 231 and second switch in Fig. 2
232 control terminal output logical signal it is identical for illustrate, but the embodiment of the present disclosure to control circuit 230 to
Whether the logical signal that the control terminal of first switch 231 and the control terminal of second switch 232 export does not constitute restriction identical, controls
Circuit 230 can not be identical to the logical signal that the control terminal of first switch 231 and the control terminal of second switch 232 export, only
One that control circuit 230 controls in first switch 231 and second switch 232 under same operation time need to be met to be on
State, another is in off state.
In conclusion power control system provided in this embodiment works as control by the way that second switch is arranged in control circuit
When circuit processed is in off state by the control terminal control first switch of first switch, the control terminal for passing through second switch is controlled
Second switch is in the conductive state, so that the load circuit being connected with second switch replaces the functional circuit being connected with first switch
The power that switching power source chip provides is consumed, guarantees that the switching frequency in switching power source chip is not less than preset threshold；It solves
Coil under lower switching frequency in inductance can generate magnetic force and to collide between coil, so that generating human ear can be with
The noise problem heard；The power for replacing functional circuit consumption switching power source chip to provide using load circuit is reached, has improved
Switching frequency in switching power source chip reduces the effect for the noise that the coil in inductance generates.
Based on the power control system 200 that Fig. 2 embodiment provides, which can also include：Capacitance-resistance filter
Wave circuit 610, as shown in Figure 6.
Rc filter circuit 610 is arranged between the second end of inductance 220 and functional circuit 240.
Rc filter circuit 610 includes the first filter capacitor 611 and the second filter capacitor 612.
The first end of first filter capacitor 611 is connected with the second end of inductance 220, the second end of the first filter capacitor 611
Ground connection；The first end of second filter capacitor 612 is connected with the second end of inductance 220, the second termination of the second filter capacitor 612
Ground.
For the rc filter circuit 610 for preventing Switching Power Supply when being powered at the beginning, the DC voltage of generation is excessive, rises
To the effect of the protection to circuit.
Optionally, which can also include：Protect circuit 620.
Protection circuit 620 is connected with the second end of inductance 220.
Protecting circuit 620 includes protective resistance 621, and the first end of protective resistance 621 is connected with the second end of inductance 220,
The second end of protective resistance is grounded.
For protection circuit 620 for preventing Switching Power Supply when being powered at the beginning, the power supply that switching power source chip 210 provides is electric
It flows through greatly, plays the role of the protection to circuit.
In conclusion power control system provided in this embodiment works as control by the way that second switch is arranged in control circuit
When circuit processed is in off state by the control terminal control first switch of first switch, the control terminal for passing through second switch is controlled
Second switch is in the conductive state, so that the load circuit being connected with second switch replaces the functional circuit being connected with first switch
The power that switching power source chip provides is consumed, guarantees that the switching frequency in switching power source chip is not less than preset threshold；It solves
Coil under lower switching frequency in inductance can generate magnetic force and to collide between coil, so that generating human ear can be with
The noise problem heard；The power for replacing functional circuit consumption switching power source chip to provide using load circuit is reached, has improved
Switching frequency in switching power source chip reduces the effect for the noise that the coil in inductance generates.
In a specific example, such as：The power control system is used in light socket namely functional circuit is electricity
When lamp socket circuit.Specific circuit diagram is as shown in Figure 7：
Light socket 700 includes：DC power supply exports 710, functional circuit 720,730 first switch of control circuit
740, second switch 750, load circuit 760 and protection circuit 770.
Wherein：DC power supply exports 710：Supply current input interface 71, capacitor C8 and capacitor C9.Power supply electricity
Stream input interface 71 is connected with the first end of the first end of capacitor C8 and capacitor C9 respectively, the second end of capacitor C8 and capacitor C9's
Second end is all grounded.Capacitor C8 and capacitor C9 prevents supply current input excessive for protecting circuit.
Functional circuit 720 includes：Two jacks 70 of relay U101, diode D100 and light socket.Relay
The pin 1 of U101 is connected with supply current input interface 71, the open end phase of the pin 3 and diode D100 of relay U101
Even, the pin 2 and pin 4 of relay U101 is two jacks 70 of light socket.
Control circuit 730 includes：Current input terminal 79 and resistance R104.Wherein, current input terminal 79 and resistance R104
Second end is connected.Optionally, current input terminal 79 can be connected with supply current input interface 71.Control circuit 730 is for controlling
The on and off of first switch 740 and second switch 750 processed.
First switch 740 includes：Triode Q100 and resistance R100.Wherein, the emitter 76 of triode Q100 is grounded, and three
The collector 77 of pole pipe Q100 is connected with the pin 3 of relay U101, and the first of the base stage 78 and resistance R100 of triode Q100
End is connected, the second end ground connection of resistance R100.First switch 740 is used for the opening and closing of control function circuit 720.
Second switch 750 includes：Triode Q3.Wherein, the collector 77 of the base stage 73 of triode Q3 and triode Q100
It is connected, the collector of triode Q3 is connected with supply current input interface 71.Second switch 750 is for controlling load circuit 760
Opening and closing.
Load circuit 760 includes：Resistance R4.Wherein, the first end of resistance R4 is connected with the emitter 74 of triode Q3, electricity
Hinder the second end ground connection of R4.Load circuit 760 is used for when functional circuit 720 is closed, and consumes power supply electricity instead of functional circuit 720
The power that input interface 71 inputs is flowed, guarantees the switching frequency of switching power source chip not less than predetermined threshold.
Protection circuit 770 include：Resistance R19.Wherein, the first end of resistance R19 is connected with supply current input interface 71,
The second end of resistance R19 is grounded.
When control circuit 730 is in the conductive state by control triode Q100, triode Q3 is in off state, so that
Relay U101 is in normal operating conditions, and when resistance R4 is in close state, Switching Power Supply is in normal mode of operation, after
Electric appliance U101 can provide supply current to light socket.
When control circuit 730 is in off state by controlling triode Q100, triode Q3 is in the conductive state, so that
Relay is in close state, and when resistance R4 is in normal operating conditions, Switching Power Supply is in low power mode of operation.Pass through
Resistance R4 makes the switching frequency in switching power source chip not less than preset threshold, the line for avoiding inductance from occurring when generating magnetic force
Noise caused by collision between circle.
It should be noted is that as a kind of possible implementation, when Switching Power Supply is in the Working mould of low-power consumption
When formula, the switching frequency of switching power source chip can be improved by reducing the inductance value of inductance, since the inductance value of inductance is inductance
The value of the attribute of itself reduces switch electricity so the inductance value for reducing inductance can reduce the conduct radiation surplus of Switching Power Supply
The performance in source.
It needs to illustrate on the other hand, as alternatively possible implementation, when Switching Power Supply is in the work of low-power consumption
When operation mode, it can be limited by the current-limiting points to switching power source chip.That is, passing through the limit for reducing switching power source chip
The threshold value of flow point, improves the switching frequency of switching power source chip, to reduce the noise generated between inductance coil.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (11)
1. a kind of power control system, which is characterized in that the power control system includes：
Switching power source chip, for exporting supply current by output end；
Inductance, the first end of the inductance are connected with the output end of the switching power source chip, the second end of the inductance
It is connected respectively with control circuit, first switch and the second switch；
The control circuit is also connected with the control terminal of the control terminal of the first switch and the second switch respectively, the control
Circuit processed be used for controlled under same operation time in the first switch and the second switch one it is in the conductive state；
The first switch is also connected with functional circuit, and the functional circuit is for providing the operating circuit of predetermined function；
The second switch is also connected with load circuit, and the load circuit is used to make described when the functional circuit is closed
Switching frequency in switching power source chip is not less than preset threshold.
2. power control system according to claim 1, which is characterized in that the control circuit is Wireless Fidelity WiFi control
Circuit processed.
3. according to the power control system described in claim 1, which is characterized in that the functional circuit includes light socket
Circuit, MP3 socket circuit, MP4 socket circuit, smart phone socket circuit, washing machine display screen circuit, refrigerator display
Shield any one in the display screen circuit of circuit, the display screen circuit of electric cooker, the display screen circuit of air-conditioning, electronic scale
Kind.
4. power control system according to claim 1, which is characterized in that the load circuit includes the first power consumption electricity
Resistance, the first end of the first power consumption resistance are connected with the second switch, the second end ground connection of the first power consumption resistance.
5. power control system according to claim 1, which is characterized in that the switching power source chip is that non-isolation type is opened
Powered-down source.
6. power control system according to claim 1, which is characterized in that the first switch includes triode, field effect
Any one in Ying Guan, single-pole double-throw switch (SPDT).
7. power control system according to claim 1, which is characterized in that the second switch includes triode, field effect
Any one in Ying Guan, single-pole double-throw switch (SPDT).
8. power control system according to any one of claims 1 to 7, which is characterized in that the power control system also wraps
Rc filter circuit is included, the rc filter circuit is arranged between the second end of the inductance and the functional circuit.
9. power control system according to claim 8, which is characterized in that the rc filter circuit includes the first filtering
The first end of capacitor and the second filter capacitor, first filter capacitor is connected with the second end of the inductance, first filter
The second end of wave capacitor is grounded；The first end of second filter capacitor is connected with the second end of the inductance, second filter
The second end of wave capacitor is grounded.
10. power control system according to any one of claims 1 to 7, which is characterized in that the power control system also wraps
Protection circuit is included, the protection circuit is connected with the second end of the inductance.
11. power control system according to claim 10, which is characterized in that the protection circuit includes protective resistance,
The first end of the protective resistance is connected with the second end of the inductance, the second end ground connection of the protective resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511032487.2A CN105978364B (en) | 2015-12-31 | 2015-12-31 | Power control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511032487.2A CN105978364B (en) | 2015-12-31 | 2015-12-31 | Power control system |
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| CN105978364B true CN105978364B (en) | 2018-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106604504A (en) * | 2016-12-16 | 2017-04-26 | 成都连运网络科技有限公司 | Intelligent lamp box management system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645648A (en) * | 2009-09-15 | 2010-02-10 | 上海导向微电子有限公司 | Frequency control system and method for turning on/off power supply |
| CN201878004U (en) * | 2010-10-15 | 2011-06-22 | 四川长虹电器股份有限公司 | Circuit for switching power supply |
| CN102792574A (en) * | 2010-03-09 | 2012-11-21 | 株式会社村田制作所 | Switching power supply device |
| CN103299527A (en) * | 2012-01-11 | 2013-09-11 | 松下电器产业株式会社 | Switching power supply circuit |
| CN205596030U (en) * | 2015-12-31 | 2016-09-21 | 小米科技有限责任公司 | Power -supply control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102083301B1 (en) * | 2013-06-12 | 2020-03-03 | 삼성전자 주식회사 | Power supply, power control method thereof, and display apparatus having the same |
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2015
- 2015-12-31 CN CN201511032487.2A patent/CN105978364B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645648A (en) * | 2009-09-15 | 2010-02-10 | 上海导向微电子有限公司 | Frequency control system and method for turning on/off power supply |
| CN102792574A (en) * | 2010-03-09 | 2012-11-21 | 株式会社村田制作所 | Switching power supply device |
| CN201878004U (en) * | 2010-10-15 | 2011-06-22 | 四川长虹电器股份有限公司 | Circuit for switching power supply |
| CN103299527A (en) * | 2012-01-11 | 2013-09-11 | 松下电器产业株式会社 | Switching power supply circuit |
| CN205596030U (en) * | 2015-12-31 | 2016-09-21 | 小米科技有限责任公司 | Power -supply control system |
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Address after: 100085 Beijing Haidian District Qinghe middle street 68 Huarun colorful shopping mall two phase 13 level. Patentee after: Xiaomi Technology Co.,Ltd. Patentee after: Shanghai chuangmi Shulian Intelligent Technology Development Co., Ltd Address before: 100085 Beijing Haidian District Qinghe middle street 68 Huarun colorful shopping mall two phase 13 level. Patentee before: Xiaomi Technology Co.,Ltd. Patentee before: Shanghai chuangmi Technology Co., Ltd |
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