CN205596030U - Power -supply control system - Google Patents
Power -supply control system Download PDFInfo
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- CN205596030U CN205596030U CN201521140490.1U CN201521140490U CN205596030U CN 205596030 U CN205596030 U CN 205596030U CN 201521140490 U CN201521140490 U CN 201521140490U CN 205596030 U CN205596030 U CN 205596030U
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Abstract
This has openly revead a power -supply control system, belongs to intelligent house field. Power -supply control system includes: switching power supply chip, inductance, control circuit, first switch, second switch, functional circuit and load circuit. The first switch of control end control that control circuit passes through first switch is when off -state, and the control second switch is in on -state for the functional circuit that load circuit replaces and first switch links to each other that links to each other with the second switch consumes the power that the switching power supply chip provided, guarantees that switching frequency in the switching power supply chip is not less than to predetermine the threshold value, the problem of under lower switching frequency the coil in the inductance can produce magnetic force and make between the coil and the collision to appear to produce the noise that people's ear can be heard is solved, reached and utilized load circuit to replace the functional circuit to consume the power that the switching power supply chip provided, improved the switching frequency in the switching power supply chip, reduced the effect of the noise of the coil production in the inductance.
Description
Technical field
It relates to Smart Home field, particularly to a kind of power control system.
Background technology
Switching Power Supply is, by the quick on-off of switching tube, alternating current is converted to galvanic power supply circuits.Should
Switching tube has certain switching frequency.
The power control system that correlation technique provides, including: switching power source chip, by inductance and switch electricity
The control circuit that source chip is connected, the functional circuit that is connected with switching power source chip by inductance.Wherein, open
Closing power supply chip to be used for exporting square wave supply current, inductance supplies for the square wave exported by switching power source chip
Electricity electric current is converted into direct current supply electric current.Switch it is additionally provided with, the control of this switch between inductance and functional circuit
End processed is connected with control circuit.Control circuit is by the control to this switch, it is achieved the unlatching to functional circuit
And closedown.Wherein switching power source chip and inductor combination form Switching Power Supply.Such as, control circuit is to control
During end output logic signal 1, switch conduction, functional circuit is opened；The most such as, control circuit is to controlling end
During output logic signal 0, switch cut-off, functional circuit cuts out.Functional circuit is used for realizing predetermined function,
Such as in intelligent electric lamp, functional circuit can be LED illuminating circuit.
Under low-power consumption mode, the pent pattern of such as functional circuit, Switching Power Supply needs to reduce switch lock
Rate, but owing to there is certain gap, inductance under relatively low switching frequency between the coil in above-mentioned inductance
In coil can produce magnetic force and make to occur between coil collision, thus produce the noise that human ear can be heard.
Utility model content
Coil in order to solve in inductance under relatively low switching frequency can produce magnetic force and make appearance between coil
Collision, thus produce the problem of the noise that human ear can be heard, the disclosure provides a kind of power control system.
Described technical scheme is as follows:
First aspect according to disclosure embodiment, it is provided that a kind of power control system, this power control system
Including:
Switching power source chip, for exporting supply current by outfan；
Inductance, the first end of inductance is connected with the outfan of switching power source chip, the second end of inductance respectively with
Control circuit, the first switch are connected with second switch；
Control circuit is connected with the control end of the first switch and the control end of second switch the most respectively, control circuit
One for controlling under same operation time in the first switch and second switch in the conduction state；
First switch is also connected with functional circuit, and functional circuit is the operating circuit for providing predetermined function；
Second switch is also connected with load circuit, and load circuit, for when functional circuit cuts out, makes switch electricity
Switching frequency in source chip is not less than predetermined threshold value.
Optionally, control circuit is Wireless Fidelity WiFi control circuit.
Optionally, functional circuit includes light socket circuit, MP3 socket circuit, MP4 socket circuit, intelligence
Expert's machine socket circuit, the display screen circuit of washing machine, the display screen circuit of electric refrigerator, the display of electric cooker
Screen circuit, the display screen circuit of air-conditioning, electronic scale display screen circuit in any one.
Optionally, load circuit includes the first power consumption resistance, one end of the first power consumption resistance and second switch phase
Even, the other end ground connection of the first power consumption resistance.
Optionally, switching power source chip is non-isolation type switch power.
Optionally, the first switch includes any one in audion, field effect transistor, single-pole double-throw switch (SPDT).
Optionally, any one during second switch includes audion, field effect transistor, single-pole double-throw switch (SPDT).
Optionally, power control system also includes rc filter circuit, and rc filter circuit is arranged on inductance
Between second end and functional circuit.
Optionally, rc filter circuit includes the first filter capacitor and the second filter capacitor, the first filter capacitor
The first end be connected with the second end of inductance, the second end ground connection of the first filter capacitor；Second filter capacitor
First end is connected with the second end of inductance, the second end ground connection of the second filter capacitor.
Optionally, power control system also includes that protection circuit, protection circuit are connected with the second end of inductance.
Optionally, protection circuit includes that protective resistance, protective resistance are connected with the second end of inductance, and first protects
Protect the second end ground connection of resistance.
Embodiment of the disclosure that the technical scheme of offer can include following beneficial effect:
By arranging second switch in control circuit, when control circuit is controlled by the control end of the first switch
When first switch is in cut-off state, control second switch by the control end of second switch in the conduction state,
The load circuit being connected with second switch is made to replace the functional circuit being connected with the first switch to consume Switching Power Supply
The power that chip provides, it is ensured that the switching frequency in switching power source chip is not less than predetermined threshold value；Solve
Under relatively low switching frequency, the coil in inductance can produce magnetic force and make to occur between coil collision, thus produces
The noise problem that human ear can be heard；Reach to utilize load circuit to replace functional circuit to consume Switching Power Supply core
The power that sheet provides so that the switching frequency in switching power source chip is not less than predetermined threshold value, the line in inductance
Circle will not produce the effect of the noise that human ear can be heard.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, can not
Limit the disclosure.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the disclosure
Embodiment, and in description together for explaining the principle of the disclosure.
Fig. 1 is the structural representation according to a kind of power control system shown in an exemplary embodiment；
Fig. 2 is the structural representation according to a kind of power control system shown in another exemplary embodiment；
Fig. 3 is the electricity converting electric current according to a kind of switching power source chip shown in an exemplary embodiment and inductance
Road schematic diagram；
Fig. 4 is the circuit connection diagram according to the first switch shown in an exemplary embodiment；
Fig. 5 is the circuit connection diagram according to the second switch shown in an exemplary embodiment；
Fig. 6 is the structural representation according to a kind of power control system shown in another exemplary embodiment；
Fig. 7 is the electricity being applied to light socket according to a kind of power control system shown in an exemplary embodiment
Road connection diagram.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Following retouches
Stating when relating to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.
Embodiment described in following exemplary embodiment does not represent all embodiment party consistent with the disclosure
Formula.On the contrary, they only with describe in detail in appended claims, the disclosure some in terms of mutually one
The example of the apparatus and method caused.
Fig. 1 is the structural representation according to a kind of power control system 100 shown in an exemplary embodiment.
As it is shown in figure 1, this power control system 100 may include that switching power source chip 110, inductance 120, control
Circuit 130 processed, functional circuit 140 and load circuit 150.
Switching power source chip 110, for exporting supply current by outfan.
Being provided with a switching tube in switching power source chip 110, switching power source chip 110 is switched by control
The conducting of pipe and the frequency (being called for short switching frequency in full) of cut-off, carry out the supply current of control output end output
Size.The switching frequency of switching power source chip 110 and the size direct proportionality of the supply current of output,
Switching frequency is the highest, and the supply current of outfan output is the biggest.
First end of inductance 120 is connected with the outfan of switching power source chip 110, the second end of inductance 120
It is connected with control circuit the 130, first switch 131 and second switch 132 respectively.
Wherein, switching power source chip 110 and inductance 120 combination form Switching Power Supply 160.
Control circuit 130 switchs control end and the control end phase of second switch 132 of 131 the most respectively with first
Even, control circuit 130 is for controlling in the first switch 131 and second switch 132 under same operation time
One in the conduction state.
First switch 131 is also connected with functional circuit 140, and functional circuit 140 is for providing predetermined function
Operating circuit.
Second switch 132 is also connected with load circuit 150, and load circuit 150 is at functional circuit 140
During closedown, the switching frequency in switching power source chip 110 is made to be not less than predetermined threshold value.
In Fig. 1, the first end of control circuit 130 is connected with the second end of inductance 120, control circuit 130
The second end control end controlling end and second switch 132 with the first switch 131 respectively be connected.
First end of the first switch 131 is connected with the second end of inductance 120, the control end of the first switch 131
Being connected with the second end of control circuit 130, the second end of the first switch 131 is connected with functional circuit 140.
First end of second switch 132 is connected with the second end of inductance 120, the control end of second switch 132
Being connected with the second end of control circuit 130, the second end of second switch 132 is connected with load circuit 150.
First end of load circuit 150 is connected with the second end of second switch 132, the of load circuit 150
Two end ground connection.
Wherein, control circuit 130 is by controlling first to the control end output logic signal of the first switch 131
The duty of switch 131；Control circuit 130 is believed by exporting logic to the control end of second switch 132
Number control second switch 132 duty.Under same operation time, control circuit 130 is by output
One in logical signal control the first switch 131 and second switch 132 in the conduction state, at another
In cut-off state.
Such as: control circuit 130 is when the control end output logic signal 1 of the first switch 131, and first opens
Closing 131 conductings, the functional circuit 140 being connected with the second end of the first switch 131 is opened；Control circuit 130
When the control end output logic signal 0 of the first switch 131, the first switch 131 cut-off, with the first switch
The functional circuit 140 that second end of 131 is connected cuts out.
The most such as: control circuit 130 when the control end output logic signal 1 of second switch 132, second
Switch 132 cut-off, the load circuit 150 being connected with the second end of second switch 132 cuts out；Control circuit
130 when the control end output logic signal 0 of second switch 132, and second switch 132 turns on, and opens with second
The load circuit 150 that second end of pass 132 is connected is opened.
Alternatively, at same operation time, control circuit 130 is to the control end and second of the first switch 131
The logical signal controlling end output of switch 132 is identical.
Such as: control circuit 130 is defeated to the control end controlling end and second switch 132 of the first switch 131
During the logical signal 1 gone out, the first switch 131 conducting, second switch 132 ends, with the first switch 131
The second end be connected functional circuit 140 open, the load circuit being connected with the second end of second switch 132
150 close；Control circuit 130 is to the control end output controlling end and second switch 132 of the first switch 131
Logical signal 0 time, the first switch 131 cut-off, second switch 132 turns on, with the first switch 131
The functional circuit 140 that second end is connected cuts out, the load circuit 150 being connected with the second end of second switch 132
Open.
Control circuit 130 is by exporting to the control end controlling end and second switch 132 of the first switch 131
Logical signal controls functional circuit 140 and the opening and closing of load circuit 150.
While control circuit 130 controls functional circuit 140 closedown by logical signal, believed by logic
Number control load circuit 150 is opened, and utilizes load circuit 150 to replace functional circuit 140 to consume Switching Power Supply
The supply current that chip 110 provides, so that the switching frequency in switching power source chip 110 is not less than pre-
If threshold value.
It should be noted is that, the power that load circuit 150 consumes is far smaller than functional circuit 140 and consumes
Power, utilize load circuit 150 replace functional circuit 140 consume switching power source chip 110 provide merit
Rate, the switching frequency being intended merely to control in switching power source chip 110 is not less than predetermined threshold.
Need explanation on the other hand, in Fig. 1 with control circuit 130 to first switch 131 control end and
As a example by the logical signal controlling end output of second switch 132 is identical illustrative, but the disclosure is real
Execute example to control circuit 130 to the control end output controlling end and second switch 132 of the first switch 131
Logical signal is the most identical does not constitute restriction, and control circuit 130 is to the control end and second of the first switch 131
The logical signal controlling end output of switch 132 can differ, and only need to meet and control under same operation time
Control in the first switch 131 and second switch 132 one of circuit 130 processed is in the conduction state, another
It is in cut-off state.
In sum, the power control system that the present embodiment provides, open by arranging second in control circuit
Close, when control circuit by the control end of the first switch control the first switch be in cut-off state time, by the
It is in the conduction state that the control end of two switches controls second switch so that the load circuit being connected with second switch
The functional circuit being connected with the first switch is replaced to consume the power that switching power source chip provides, it is ensured that Switching Power Supply
Switching frequency in chip is not less than predetermined threshold value；Solve the coil in inductance under relatively low switching frequency
Magnetic force can be produced and make to occur between coil collision, thus produce the noise problem that human ear can be heard；Reach
Utilize load circuit to replace functional circuit to consume the power that switching power source chip provides, improve Switching Power Supply
Switching frequency in chip, reduces the effect of the noise that the coil in inductance produces.
Fig. 2 is the structural representation according to a kind of power control system 200 shown in another exemplary embodiment,
As in figure 2 it is shown, this power control system 200 may include that switching power source chip 210, inductance 220, control
Circuit 230 processed, functional circuit 240 and load circuit 250.
Switching power source chip 210, for exporting supply current by outfan.
Being provided with a switching tube in switching power source chip 210, switching power source chip 210 is switched by control
Pipe conducting and the frequency of cut-off, carry out the size of the supply current of control output end output.Switching power source chip 210
The size direct proportionality of supply current of switching frequency and output, switching frequency is the highest, and outfan is defeated
The supply current gone out is the biggest.
Wherein, switching power source chip 210 is non-isolation type switch power.
Optionally, switching power source chip 210 can also is that AC (Alternating Current, exchange)-DC
(Direct Current, direct current) type Switching Power Supply or PWM type Switching Power Supply.
First end of inductance 220 is connected with the outfan of switching power source chip 210, the second end of inductance 220
It is connected with control circuit the 230, first switch 231 and second switch 232 respectively.
Switching power source chip 210 combines inductance 220 and the alternating current of input is converted into direct current supply electric current.
Wherein, switching power source chip 210 and inductance 220 combination form Switching Power Supply 260.
Such as: switching power source chip 210 combines inductance 220 and alternating current is converted into the circuit of DC current
Figure is as shown in Figure 3.
In Fig. 3, the alternating current of input first passing around rectification circuit 211, rectification circuit 211 is for by defeated
The alternating current entered is converted into the DC current of output.Rectification circuit 211 includes: AC-DC rectifier bridge 23,
The pin 3 of AC-DC rectifier bridge 23 and pin 4 access the alternating current of input, AC-DC rectifier bridge 23
DC current after pin 1 and pin 2 output conversion.Optionally, rectification circuit 211 also includes first week
Limit circuit 212, this first peripheral circuit 212 includes resistance R3, resistance R12, polar capacitor C6, steady
Stream inductance 24 and polar capacitor C13.Wherein, incoming transport electric current between input 21 and input 22,
Input 21 is connected with first end of resistance R3, the first end phase of second end of resistance R3 and resistance R12
Even, second end of resistance R12 is connected with input 22；Second end of resistance R3 and AC-DC rectifier bridge
The pin 4 of 23 is connected, and input 22 is connected with the pin 3 of AC-DC rectifier bridge 23.Whole at AC-DC
The pin 1 of stream bridge 23 is connected with the positive pole of polar capacitor C6, the minus earth of polar capacitor C6.AC-DC
The pin 1 of rectifier bridge 23 is also connected with the first end of stabilizing inducatnce 24, the second end of stabilizing inducatnce 24 and pole
Property electric capacity C13 positive pole be connected, the minus earth of polar capacitor C13.Resistance R3 and resistance R12 is used for
Protection circuit, AC-DC rectifier bridge 23 is for being converted into DC current, stabilizing inducatnce by the alternating current of input
24 for stablizing the DC current of AC-DC rectifier bridge output.
In Fig. 3, using the electric current after rectification circuit 211 converts as the input of switching power source chip 210.
Switching power source chip 210 includes power supply chip U2, and wherein, power supply chip U2 includes 5 pins, respectively
For VCC, FB, DRAIN and two SOURCE pins.VCC pin 1 is for power supply chip U2
Self provides electric current；FB pin 2 is for the overload feedback of out-put supply chip U2, that is, work as power supply core
When the switching frequency of sheet U2 and peak point current all reach maximum, if continuing to increase load, then FB can be by power supply
The output voltage of chip U2 reduces；DRAIN pin 5 is the power MOS within power supply chip U2
The drain electrode of pipe, is the input of current source；SOURCE pin 3 and SOURCE pin 4 is power supply chip
The source electrode of the power MOS pipe within U2, the reference as VCC pin and FB pin exports, for defeated
Go out supply current.Optionally, the power MOS pipe within power supply chip U2 refers to switching power source chip 210
In switching tube.
Optionally, switching power source chip 210 also includes the second peripheral circuit 213, the second peripheral circuit
213 include electric capacity C1, electric capacity C2, electric capacity C3, polar capacitor C18, resistance R5, resistance R7, two
Pole pipe D102 and diode D1.
In Fig. 3, switching power source chip 210 is connected as follows with the circuit of the second peripheral circuit 213: current stabilization electricity
Second end of sense 24 is also connected with the DRAIN pin 5 of power supply chip U2, the VCC of power supply chip U2
Pin 1 is connected with first end of electric capacity C1, second end of electric capacity C1 and the SOURCE of power supply chip U2
Pin 3 is connected, and the SOURCE pin 3 of power supply chip U2 is connected with SOURCE pin 4, power supply core
The FB pin 2 of sheet U2 is connected with first end of electric capacity C2, second end of electric capacity C2 and power supply chip U2
SOURCE pin 3 be connected, the FB pin 2 of power supply chip U2 respectively with first end of resistance R5 and
First end of resistance R7 is connected, and one end that second end of resistance R7 is closed with diode D102 is connected, and two
One end ground connection of pole pipe D102 opening, second end of resistance R5 respectively with the first end and two poles of electric capacity C3
One end that pipe D1 closes is connected, SOURCE pin 3 phase of second end of electric capacity C3 and power supply chip U2
Even, one end of diode D1 opening is connected with the positive pole of polar capacitor C18, the negative pole of polar capacitor C18
Ground connection.
In Fig. 3, the electric current after switching power source chip 210 converts is input in inductance 220, in conjunction with inductance 220
Current transformation after converting is direct current supply electric current.Wherein, inductance 220 includes: inductance L3, inductance L3
Pulse current for being inputted by switching power source chip 210 converts direct current supply electric current.
Optionally, inductance 220 also includes the 3rd peripheral circuit 214, and the 3rd peripheral circuit 214 includes electricity
Hold C4 and resistance R11.
In Fig. 3, inductance 220 is connected as follows with the circuit of the 3rd peripheral circuit 214: power supply chip U2's
The first end that SOURCE pin 3 continues with inductance L3 after being connected with electric capacity C3 is connected, inductance L3's
Second end is connected with first end of electric capacity C4 and first end of resistance R11 respectively；Second termination of electric capacity C4
Ground, the second end ground connection of resistance R11.After the circuit of Fig. 3 converts, can be from the first of resistance R11
End draws the direct current supply electric current that switching power source chip 210 provides.
The whole conversion process of the circuit diagram shown in Fig. 3 is as follows: assuming that input the friendship of 220V from input 21
Stream voltage, is converted into the DC voltage of 370V, input switch power supply chip through AC-DC rectifier bridge 23
In 210, through the effect of switching power source chip 210 and electric capacity C1, electric capacity C2 and electric capacity C3 by 370V
DC voltage be converted into the pulse voltage of 12V, then after inductance 220, the pulse voltage of 12V is produced
Raw pulse current is converted into direct current supply electric current.
Control circuit 230 switchs control end and the control end phase of second switch 232 of 231 the most respectively with first
Even, control circuit 230 is for controlling in the first switch 231 and second switch 232 under same operation time
One in the conduction state.
Optionally, control circuit 230 is WiFi (Wireless Fidelity, Wireless Fidelity) control circuit 233.
WiFi control circuit 233 refers to that electronic equipment passes through WiFi module to the first switch 231 and second switch 232
Send control signal, thus control the circuit of the duty of the first switch 231 and second switch 232.
Control circuit 230 same operation time control first switch 231 and second switch 232 in one
In the conduction state, another is in cut-off state.
First switch 231 is also connected with functional circuit 240, and functional circuit 240 is for providing predetermined function
Operating circuit.
Optionally, what the first switch 231 included in audion, field effect transistor, single-pole double-throw switch (SPDT) is any one
Kind.
Such as, the first switch 231 is audion 40, then the base stage 41 of audion 40 and control circuit 230
Being connected, the colelctor electrode 42 of audion 40 is connected with inductance 220, the emitter stage 43 of audion 40 and function
Circuit 240 is connected, as shown in Figure 4.
Optionally, functional circuit 240 include light socket circuit, MP3 socket circuit, MP4 socket circuit,
Smart mobile phone socket circuit, the display screen circuit of washing machine, the display screen circuit of electric refrigerator, electric cooker aobvious
Display screen circuit, the display screen circuit of air-conditioning, 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 electric light
Socket circuit, then functional circuit 240 can be light socket circuit, then functional circuit 240 can be electric light
The DC current needed is provided.
Second switch 232 is also connected with load circuit 250, and load circuit 250 is at functional circuit 240
During closedown, the switching frequency in switching power source chip 210 is made to be not less than predetermined threshold value.
Optionally, any one during second switch 232 includes audion, field effect transistor, single-pole double-throw switch (SPDT)
Kind.
Such as, second switch 232 is audion 50, then the base stage 51 of audion 50 and control circuit 230
Being connected, the colelctor electrode 52 of audion 50 is connected with inductance 220, the emitter stage 53 of audion 50 and load
Circuit 250 is connected, as shown in Figure 5.
Optionally, load circuit 250 includes the first power consumption resistance 251.
First end of the first power consumption resistance 251 is connected with second switch 232, the of the first power consumption resistance 251
Two end ground connection.
In Fig. 2, the first end of control circuit 230 is connected with the second end of inductance 220, control circuit 230
The second end control end controlling end and second switch 232 with the first switch 231 respectively be connected.
First end of the first switch 231 is connected with the second end of inductance 220, the control end of the first switch 231
Being connected with the second end of control circuit 230, the second end of the first switch 231 is connected with functional circuit 240.
First end of second switch 232 is connected with the second end of inductance 220, the control end of second switch 232
Being connected with the second end of control circuit 230, the second end of second switch 232 is connected with load circuit 250.
Wherein, control circuit 230 is by controlling first to the control end output logic signal of the first switch 231
The duty of switch 231；Control circuit 230 is believed by exporting logic to the control end of second switch 232
Number control second switch 232 duty.Under same operation time, control circuit 230 is by output
One in logical signal control the first switch 231 and second switch 232 in the conduction state, at another
In cut-off state.
Such as: assuming that the first switch 231 be audion 40 and second switch 232 is audion 50.Control electricity
Road 230 is when audion 40 output logic signal 1, and audion 40 is in the conduction state, with audion 40
The functional circuit 240 being connected is opened；Control circuit 230 when audion 40 output logic signal 0, three poles
Pipe 40 is in cut-off state, and the functional circuit 240 being connected with audion 40 cuts out.
The most such as: control circuit 230 is when audion 50 output logic signal 1, and audion 50 is in and cuts
Only, the load circuit 250 being connected with audion 50 cuts out；Control circuit 230 is patrolled to audion 50 output
When collecting signal 0, audion 50 is in the conduction state, and the load circuit 250 being connected with audion 50 is opened.
At same operation time, the logical signal that control circuit 230 exports to audion 40 and audion 50
Identical.
Such as: during the logical signal 1 that control circuit 230 exports to audion 40 and audion 50, three poles
Pipe 40 is in the conduction state, and audion 50 is in cut-off state, the functional circuit 240 being connected with audion 40
Opening, the load circuit 250 being connected with audion 50 cuts out；Control circuit 230 is to audion 40 and three
During the logical signal 0 that pole pipe 50 exports, audion 40 is in cut-off state, and audion 50 is on shape
State, the functional circuit 240 being connected with audion 40 cuts out, the load circuit 250 being connected with audion 50
Open.
Control circuit 230 is by exporting to the control end controlling end and second switch 232 of the first switch 231
Logical signal controls functional circuit 240 and the opening and closing of load circuit 250.
While control circuit 230 controls functional circuit 240 closedown by logical signal, believed by logic
Number control load circuit 250 is opened, and utilizes load circuit 250 to replace functional circuit 240 to consume Switching Power Supply
The supply current that chip 210 provides, so that the switching frequency in switching power source chip 210 is not less than pre-
If threshold value.
It should be noted is that, the power that load circuit 250 consumes is far smaller than functional circuit 240 and consumes
Power, utilize load circuit 250 replace functional circuit 240 consume switching power source chip 210 provide merit
Rate, the switching frequency being intended merely to control in switching power source chip 210 is not less than predetermined threshold.
Need explanation on the other hand, in Fig. 2 with control circuit 230 to first switch 231 control end and
As a example by the logical signal controlling end output of second switch 232 is identical illustrative, but the disclosure is real
Execute example to control circuit 230 to the control end output controlling end and second switch 232 of the first switch 231
Logical signal is the most identical does not constitute restriction, and control circuit 230 is to the control end and second of the first switch 231
The logical signal controlling end output of switch 232 can differ, and only need to meet and control under same operation time
Control in the first switch 231 and second switch 232 one of circuit 230 processed is in the conduction state, another
It is in cut-off state.
In sum, the power control system that the present embodiment provides, open by arranging second in control circuit
Close, when control circuit by the control end of the first switch control the first switch be in cut-off state time, by the
It is in the conduction state that the control end of two switches controls second switch so that the load circuit being connected with second switch
The functional circuit being connected with the first switch is replaced to consume the power that switching power source chip provides, it is ensured that Switching Power Supply
Switching frequency in chip is not less than predetermined threshold value；Solve the coil in inductance under relatively low switching frequency
Magnetic force can be produced and make to occur between coil collision, thus produce the noise problem that human ear can be heard；Reach
Utilize load circuit to replace functional circuit to consume the power that switching power source chip provides, improve Switching Power Supply
Switching frequency in chip, reduces the effect of the noise that the coil in inductance produces.
The power control system 200 provided based on Fig. 2 embodiment, this power control system 200 can also include:
Rc filter 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.
First end of the first filter capacitor 611 is connected with the second end of inductance 220, the first filter capacitor 611
The second end ground connection；First end of the second filter capacitor 612 is connected with the second end of inductance 220, the second filter
Second end ground connection of ripple electric capacity 612.
This rc filter circuit 610 be used for preventing Switching Power Supply when being energized at the beginning, the DC voltage of generation
Excessive, play the effect of the protection to circuit.
Optionally, this power control system 200 can also include: protection circuit 620.
Protection circuit 620 is connected with the second end of inductance 220.
Protection circuit 620 includes protective resistance 621, the first end of protective resistance 621 and the second of inductance 220
End is connected, the second end ground connection of protective resistance.
Protection circuit 620 is used for preventing Switching Power Supply when being energized at the beginning, and switching power source chip 210 provides
Supply current excessive, play the effect of the protection to circuit.
In sum, the power control system that the present embodiment provides, open by arranging second in control circuit
Close, when control circuit by the control end of the first switch control the first switch be in cut-off state time, by the
It is in the conduction state that the control end of two switches controls second switch so that the load circuit being connected with second switch
The functional circuit being connected with the first switch is replaced to consume the power that switching power source chip provides, it is ensured that Switching Power Supply
Switching frequency in chip is not less than predetermined threshold value；Solve the coil in inductance under relatively low switching frequency
Magnetic force can be produced and make to occur between coil collision, thus produce the noise problem that human ear can be heard；Reach
Utilize load circuit to replace functional circuit to consume the power that switching power source chip provides, improve Switching Power Supply
Switching frequency in chip, reduces the effect of the noise that the coil in inductance produces.
In a specific example, such as: this power control system is in light socket, namely function
When circuit is light socket circuit.Concrete circuit diagram is as shown in Figure 7:
Light socket 700 includes: DC power supply output 710, functional circuit 720, control circuit 730
First switch 740, second switch 750, load circuit 760 and protection circuit 770.
Wherein: DC power supply output 710 includes: supply current input interface 71, electric capacity C8 and electric capacity
C9.Supply current input interface 71 is connected with first end of electric capacity C8 and first end of electric capacity C9 respectively,
Second end of electric capacity C8 and the second end all ground connection of electric capacity C9.Electric capacity C8 and electric capacity C9 is used for protection circuit,
Prevent supply current input excessive.
Functional circuit 720 includes: two jacks 70 of relay U101, diode D100 and light socket.
The pin 1 of relay U101 is connected with supply current input interface 71, the pin of relay U101 3 with
The opening of diode D100 is connected, the pin 2 of relay U101 and pin 4 is light socket two
Jack 70.
Control circuit 730 includes: current input terminal 79 and resistance R104.Wherein, current input terminal 79 with
Second end of resistance R104 is connected.Optionally, current input terminal 79 can be with supply current input interface 71
It is connected.Control circuit 730 is for controlling the first switch 740 and the conducting of second switch 750 and cut-off.
First switch 740 includes: audion Q100 and resistance R100.Wherein, the transmitting of audion Q100
Pole 76 ground connection, the colelctor electrode 77 of audion Q100 is connected with the pin 3 of relay U101, audion Q100
Base stage 78 be connected with first end of resistance R100, the second end ground connection of resistance R100.First switch 740
For controlling the opening and closing of functional circuit 720.
Second switch 750 includes: audion Q3.Wherein, the base stage 73 and audion Q100 of audion Q3
Colelctor electrode 77 be connected, the colelctor electrode of audion Q3 is connected with supply current input interface 71.Second switch
750 for controlling the opening and closing of load circuit 760.
Load circuit 760 includes: resistance R4.Wherein, first end of resistance R4 and the transmitting of audion Q3
Pole 74 is connected, the second end ground connection of resistance R4.Load circuit 760 is used for when functional circuit 720 cuts out,
Functional circuit 720 is replaced to consume the power of supply current input interface 71 input, it is ensured that switching power source chip
Switching frequency is not less than predetermined threshold.
Protection circuit 770 includes: resistance R19.Wherein, first end of resistance R19 inputs with supply current
Interface 71 is connected, the second end ground connection of resistance R19.
When control circuit 730 is in the conduction state by controlling audion Q100, and audion Q3 is in cut-off
State so that relay U101 is in normal operating conditions, and when resistance R4 is closed, switch
Power supply is in normal mode of operation, and relay U101 can provide supply current to light socket.
When control circuit 730 is in cut-off state by controlling audion Q100, and audion Q3 is on
State so that relay is closed, and when resistance R4 is in normal operating conditions, at Switching Power Supply
In low power mode of operation.The switching frequency in switching power source chip is made to be not less than default threshold by resistance R4
Value, it is to avoid the noise that inductance collides between the coil of appearance when producing magnetic force and causes.
It should be noted is that, as a kind of possible implementation, when Switching Power Supply is in low-power consumption
During mode of operation, the switching frequency of switching power source chip can be improved by the inductance value reducing inductance, due to
The inductance value of inductance is the value of an attribute of inductance itself, so the inductance value reducing inductance can reduce Switching Power Supply
Conduct radiation surplus, reduce Switching Power Supply performance.
Need explanation on the other hand, as alternatively possible implementation, when Switching Power Supply is in low merit
During the mode of operation consumed, can be by the current-limiting points of switching power source chip be limited.That is, by fall
The threshold value of the current-limiting points of low switch power supply chip, improves the switching frequency of switching power source chip, thus reduces electricity
The noise produced between sense coil.
Those skilled in the art, after considering description and putting into practice utility model disclosed herein, will readily occur to
Other embodiment of the disclosure.The application is intended to any modification, purposes or the adaptability of the disclosure
Change, these modification, purposes or adaptations are followed the general principle of the disclosure and include the disclosure
Undocumented common knowledge in the art or conventional techniques means.Description and embodiments is considered only as
Exemplary, the true scope of the disclosure and spirit are pointed out by claim below.
It should be appreciated that the disclosure is not limited to accurate knot described above and illustrated in the accompanying drawings
Structure, and various modifications and changes can carried out without departing from the scope.The scope of the present disclosure is only by appended
Claim limits.
Claims (11)
1. a power control system, it is characterised in that described power control system includes:
Switching power source chip, for exporting supply current by outfan；
Inductance, the first end of described inductance is connected with the described outfan of described switching power source chip, described electricity
Second end of sense is connected with control circuit, the first switch and second switch respectively；
What described control circuit switched with described first the most respectively controls end and the control end phase of described second switch
Even, described control circuit is for controlling in described first switch and described second switch under same operation time
One in the conduction state；
Described first switch is also connected with functional circuit, and described functional circuit is the work for providing predetermined function
Make circuit；
Described second switch is also connected with load circuit, and described load circuit is for cutting out at described functional circuit
Time, make the switching frequency in described switching power source chip be not less than predetermined threshold value.
Power control system the most according to claim 1, it is characterised in that described control circuit is nothing
Line fidelity WiFi control circuit.
3. according to the power control system described in described claim 1, it is characterised in that described functional circuit
Including light socket circuit, MP3 socket circuit, MP4 socket circuit, smart mobile phone socket circuit, laundry
The display screen circuit of machine, the display screen circuit of electric refrigerator, the display screen circuit of electric cooker, the display screen of air-conditioning
Circuit, electronic scale display screen circuit in any one.
Power control system the most according to claim 1, it is characterised in that described load circuit includes
First power consumption resistance, the first end of described first power consumption resistance is connected with described second switch, described first merit
Second end ground connection of power consumption resistance.
Power control system the most according to claim 1, it is characterised in that described switching power source chip
It it is non-isolation type switch power.
Power control system the most according to claim 1, it is characterised in that described first switch includes
Any one in audion, field effect transistor, single-pole double-throw switch (SPDT).
Power control system the most according to claim 1, it is characterised in that described second switch includes
Any one in audion, field effect transistor, single-pole double-throw switch (SPDT).
8. according to the arbitrary described power control system of claim 1 to 7, it is characterised in that described power supply
Control system also include rc filter circuit, described rc filter circuit be arranged on the second end of described inductance with
Between described functional circuit.
Power control system the most according to claim 8, it is characterised in that described rc filter circuit
Including the first filter capacitor and the second filter capacitor, the first end of described first filter capacitor and described inductance
Second end is connected, the second end ground connection of described first filter capacitor；First end of described second filter capacitor with
Second end of described inductance is connected, the second end ground connection of described second filter capacitor.
10. according to the arbitrary described power control system of claim 1 to 7, it is characterised in that described electricity
Source control system also includes that protection circuit, described protection circuit are connected with the second end of described inductance.
11. power control systems according to claim 10, it is characterised in that described protection circuit bag
Including protective resistance, the first end of described protective resistance is connected with the second end of described inductance, described protective resistance
The second end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521140490.1U CN205596030U (en) | 2015-12-31 | 2015-12-31 | Power -supply control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521140490.1U CN205596030U (en) | 2015-12-31 | 2015-12-31 | Power -supply control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205596030U true CN205596030U (en) | 2016-09-21 |
Family
ID=56927461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521140490.1U Withdrawn - After Issue CN205596030U (en) | 2015-12-31 | 2015-12-31 | Power -supply control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205596030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978364A (en) * | 2015-12-31 | 2016-09-28 | 小米科技有限责任公司 | Power supply control system |
-
2015
- 2015-12-31 CN CN201521140490.1U patent/CN205596030U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978364A (en) * | 2015-12-31 | 2016-09-28 | 小米科技有限责任公司 | Power supply control system |
| CN105978364B (en) * | 2015-12-31 | 2018-11-30 | 小米科技有限责任公司 | Power control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160921 Effective date of abandoning: 20181130 |