CN207720022U - A kind of low-power consumption starts control circuit and power supply - Google Patents
A kind of low-power consumption starts control circuit and power supply Download PDFInfo
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Abstract
It includes switching circuit, transformer, the second bleeder circuit, first switch and the power supply IC being connect with first switch to start control circuit and power supply, the control circuit the utility model is related to a kind of low-power consumption；Transformer, including primary side winding and auxiliary winding, the first end of primary side winding and the output end of external power supply connect, and the second end of primary side winding is grounded by first switch；The first end of auxiliary winding is connect by the second bleeder circuit with switching circuit, the second end ground connection of auxiliary winding；Switching circuit is connect with the feeder ear of the output end of external power supply and power supply IC respectively.The utility model keeps power supply IC capable of fast starting on startup by the way that switching circuit is arranged, and it is turned off after power supply IC starts, reach to effectively shorten to be powered and has started time, no-load power consumption, to improve the working efficiency of complete machine, the final service life for improving power supply reliability and extending power supply.
Description
Technical field
The utility model is related to the technical field of power supply, more specifically to a kind of low-power consumption start control circuit and
Power supply.
Background technology
Growing with social and economic construction, urban road basis illumination construction level has become urban development speed
Spend the important symbol of speed and horizontal height, illuminating engineering quality good or not only influence vehicle and pedestrian safely whether,
Can energy conservation and environmental protection target is related to realize.Current China's road lighting energy consumption is extremely serious, and existing main problem has illumination
System design is exceeded, lighting control mode is backward, lighting energy saving theory is wrong, lighting energy saving measure is single etc..LED illumination drives
Power supply necessarily becomes industry focus of attention, to which people require can have the LED drive power of high-performance high reliability for people
Life escort.
There are still many deficiencies for the driving power of existing single- stage PFC LED drive power and PSR schemes on the market, such as
The LED power opening time is long, and part power consumption is still occupied after power initiation, causes overall efficiency relatively low.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, provide a kind of low-power consumption
Start control circuit and power supply.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of low-power consumption startup control electricity
Road, including switching circuit, transformer, the second bleeder circuit, first switch and the power supply IC being connect with the first switch；
The transformer, including primary side winding and auxiliary winding, the first end of the primary side winding and external power supply it is defeated
Outlet connects, and the second end of the primary side winding is grounded by the first switch；The first end of the auxiliary winding passes through institute
It states the second bleeder circuit to connect with the switching circuit, the second end ground connection of the auxiliary winding；
The switching circuit is connect with the feeder ear of the output end of the external power supply and the power supply IC respectively, is used for
The power supply is connected when connecting the external power supply, and after the input voltage that the external power supply exports is divided, output
Startup voltage controls the power supply IC to the power supply IC and quickly starts；
The power supply IC outputs control signals to the first switch and controls institute after quickly starting according to the startup voltage
First switch conducting is stated, so that the auxiliary winding of the transformer generates boost voltage, the boost voltage is through described second point
The second partial pressure of volt circuit partial pressure output to the switching circuit controls the switching circuit shutdown.
Preferably, further include：
Third bleeder circuit is connected between the feeder ear and the first end of the auxiliary winding of the power supply IC, is used for
After power supply IC startups, the boost voltage generated to the auxiliary winding divides, and output third is divided to the electricity
The feeder ear of source IC provides operating voltage to the power supply IC.
Preferably, the switching circuit includes current limliting bleeder circuit, the first bleeder circuit, second switch and the first thresholding
Circuit；
The second switch includes first end, second end and third end；
The current limliting bleeder circuit is connected between the output end of the external power supply and the second end of the second switch,
The third end of the second switch is connect with the feeder ear of the power supply IC, and the first end of the second switch passes through described first
Threshold circuit is grounded, and the first end of the second switch also passes through the output end of first bleeder circuit and the external power supply
Connection.
Preferably, the second switch is triode, and the first end of the second switch is the base stage of the triode, institute
The second end for stating second switch is the collector of the triode, and the third end of the second switch is the transmitting of the triode
Pole；
The current limliting bleeder circuit includes multiple current-limiting resistances, and the multiple current-limiting resistance is sequentially connected in series in the external electrical
Between the output end in source and the collector of the triode；
First bleeder circuit includes multiple divider resistances, and the multiple divider resistance is sequentially connected in series in the external electrical
Between the output end in source and the base stage of the triode.
Preferably, the switching circuit further includes one-way conduction device, and the one-way conduction device is connected to the second switch
Third end and the feeder ear of the power supply IC between, for being connected when the second switch is connected, and to the power supply IC
Feeder ear transmit the startup voltage.
Preferably, the switching circuit further includes that the second threshold circuit and third switch,
The third switch includes first end, second end and third end；
The first end of the third switch is connect by second threshold circuit with second bleeder circuit with described,
The second end of the third switch is connect with the first end of the second switch, the third end ground connection of the third switch.
Preferably, first threshold circuit includes the first zener diode, and second threshold circuit includes second steady
Diode is pressed, the third switch is third metal-oxide-semiconductor；
The first end of the third switch is the grid of the third metal-oxide-semiconductor, and the second end of the third switch is described
The third end of the drain electrode of third metal-oxide-semiconductor, the third switch is the source electrode of the third metal-oxide-semiconductor；
The cathode of first zener diode and the drain electrode of the first end of the second switch and the third metal-oxide-semiconductor connect
It connects, the plus earth of first zener diode；The source electrode of the third metal-oxide-semiconductor is grounded, the grid of the third metal-oxide-semiconductor with
The anode of second zener diode connects, and the cathode of second zener diode is connect with second bleeder circuit.
Preferably, the switching circuit further includes filter circuit, and the filter circuit includes filter capacitor and filter resistance,
The first end of the filter capacitor is connected between third switch and second threshold circuit, and the of the filter capacitor
Two ends are grounded, and the filter resistance is connected in parallel with the filter capacitor.
Preferably, second bleeder circuit includes third diode, the 5th diode and the 7th resistance, and the described 3rd 2
The anode of pole pipe is connect with the first end of the auxiliary winding, and the cathode of the third diode passes through the 7th resistance and institute
The anode connection of the 5th diode is stated, the cathode of the 5th diode is connect with the switching circuit.
The utility model also provides a kind of power supply, including above-described low-power consumption starts control circuit.
The low-power consumption for implementing the utility model starts control circuit, has the advantages that：The low work(of the utility model
Consumption, which starts control circuit, can make power supply IC realize quickly startup, and be automatically shut down after power supply IC starts, and not influence power supply just
Often work substantially reduces energization and starts time, no-load power consumption, the working efficiency of complete machine not only can be improved, but also power supply can be improved
Reliability and the service life for extending power supply.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural schematic diagram of the utility model low power consumpting controling circuit first embodiment；
Fig. 2 is the structural schematic diagram of the utility model low power consumpting controling circuit second embodiment；
Fig. 3 is the circuit diagram of the utility model low power consumpting controling circuit.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing carries out
It is described in detail.
The low-power consumption of the utility model starts control circuit and can be applied in LED power, especially for single- stage PFC LED
The LED drive power of driving power or PSR schemes, the low-power consumption of the utility model start control circuit efficiently solve it is existing
The startup time present in the LED drive power of PFC LED drive powers or PSR schemes is long, and no-load power consumption is big, overall efficiency
The problems such as low.
Specifically, refering to fig. 1, Fig. 1 is that a kind of low-power consumption provided by the utility model starts control circuit first embodiment
Structural schematic diagram.As shown in Figure 1, it includes switching circuit 10, transformer, second that the low-power consumption of the present embodiment, which starts control circuit,
Bleeder circuit 30, first switch 50 and the power supply IC 20 being connect with first switch 50.
Transformer, including primary side winding and auxiliary winding, the first end of primary side winding and the output end of external power supply connect,
The second end of primary side winding is grounded by first switch 50；The first end of auxiliary winding passes through the second bleeder circuit 30 and switch electricity
Road 10 connects, the second end ground connection of auxiliary winding.
Switching circuit 10 is connect with the feeder ear of the output end of external power supply and power supply IC 20 respectively, for being connect in power supply
It is connected when logical external power supply, and after the input voltage that external power supply exports is divided, output starts voltage to power supply IC 20
Power supply IC 20 is controlled quickly to start.
Power supply IC 20 outputs control signals to the control first switch of first switch 50 according to starting after voltage quickly starts
50 conductings, so that the auxiliary winding of transformer generates boost voltage, boost voltage is through the second bleeder circuit 30 partial pressure output second
Partial pressure to switching circuit 10 controls switching circuit 10 and turns off.
In the present embodiment, transformer is powered in power supply primarily as the energy device of power supply and power supply IC 20 starts
Before, transformer does not work, i.e., as shown in Figure 1, before the startups of power supply IC 20, first switch 50 is off state, at this time transformation
The primary side winding of device is obstructed, and the input voltage (HV) of the output end output of external power supply is not passed through the primary side winding of transformer, becomes
The primary side winding of depressor does not have electric current, does not export energy, and therefore, the vice-side winding of transformer is also exported without energy.
Further, after the startups of power supply IC 20, power supply IC 20 outputs control signals to first switch 50, first switch
50 receive power supply IC 20 output control signal after be connected, and then make the second end of the primary side winding of transformer pull down to ground,
I.e. the output end of the primary side winding of transformer and external power supply forms access, the input voltage warp of the output end output of external power supply
The first end of the primary side winding of transformer flows through primary side winding, at this point, primary side winding generates primary current, there is energy output, and
Output electric energy powering load is transmitted through vice-side winding (such as LED light can be such that LED light lights).
Meanwhile after the work of the primary side winding of transformer, the auxiliary winding of transformer also generates corresponding boost voltage, and
After being divided by the second bleeder circuit 30, the second partial pressure is generated to switching circuit 10, and then control switching circuit 10 and turn off, i.e.,
After the startups of power supply IC 20, the low-power consumption of the utility model start control circuit can automatically cutting off power source IC 20 start-up circuit
(switching circuit 10) removes no-load power consumption.
Switching circuit 10, respectively with provide input voltage (power-on voltage of power supply) external power supply, power supply IC 20 and
Second bleeder circuit 30 connects, and is mainly used for when power supply is powered, and is provided after being divided to input voltage and starts voltage to electricity
Source IC 20 makes power supply IC 20 quickly start, and after the startups of power supply IC 20, second provided according to the second bleeder circuit 30
Partial pressure shutdown (being stopped), (i.e. during power supply powering load), to remove unloaded work(in 20 courses of work of power supply IC
Consumption, improves the working efficiency of complete machine.
First switch 50 is connected between the second end of the primary side winding of power supply IC 20 and transformer, is mainly used for controlling
The break-make of transformer primary side winding.
Optionally, in the present embodiment, first switch 50 can be metal-oxide-semiconductor.Primary side winding is controlled by using metal-oxide-semiconductor
Break-make, it can be achieved that power supply soft start control, meanwhile, by the break-make to metal-oxide-semiconductor, can also control primary side winding primary side electricity
Stream, and then control electric energy caused by primary side winding.
Second bleeder circuit 30, is connected between the first end of the auxiliary winding of switching circuit 10 and transformer, is assisting
When winding works, boost voltage caused by auxiliary winding is divided to generate the second partial pressure, and by generated second
Partial pressure is transmitted to switching circuit 10, and control switching circuit 10 turns off.Optionally, the second bleeder circuit 30 can by multiple diodes with
Resistance is composed in series, wherein resistance is connected between multiple diodes, and multiple diodes are also sequentially connected in series in auxiliary winding
Between second end and switching circuit 10, specifically, be formed by after multiple Diode series the anode of series diode group with it is auxiliary
The second end of winding is helped to connect, the cathode of series diode group is connect with switching circuit 10.It is to be appreciated that by second point
Series diode group is set in volt circuit 30, can avoid in 20 start-up courses of power supply IC, starts voltage and flows into the second partial pressure electricity
Road 30 makes auxiliary winding generate false triggering.
Further, it can also include third bleeder circuit that the low-power consumption of the present embodiment, which starts control circuit,.
Third bleeder circuit is connected between 20 feeder ears of power supply IC and the first end of auxiliary winding, in power supply IC
After 20 start, the boost voltage generated to auxiliary winding divides, and output third is divided to the feeder ear of power supply IC 20, to
Power supply IC 20 provides operating voltage.
Optionally, third bleeder circuit can be made of multiple resistance with capacitance, wherein multiple resistance, which are sequentially connected in series, to be become
Between the first end of the auxiliary winding of depressor and the second end of capacitance, the first end of capacitance is connect with the feeder ear of power supply IC 20.
Specifically, after the startups of power supply IC 20 and when auxiliary winding works normally, mainly auxiliary winding is generated by third bleeder circuit
Boost voltage divided after, output third divide and is transmitted to the feeder ear of power supply IC 20, third partial pressure as power supply
The operating voltages of IC 20 upon actuation.
Show referring to Fig.2, Fig. 2 is the structure that a kind of low-power consumption provided by the utility model starts control circuit second embodiment
It is intended to.
As shown in Fig. 2, in this embodiment, switching circuit 10 include current limliting bleeder circuit 101, the first bleeder circuit 102,
Second switch 103 and the first threshold circuit 105.
Second switch 103 includes first end, second end and third end.
Current limliting bleeder circuit 101 is connected between the output end of external power supply and the second end of second switch 103, and second opens
The third end of pass 103 is connect with the feeder ear of power supply IC 20, and the first end of second switch 103 is connect by the first threshold circuit 105
The first end on ground, second switch 103 is also connect by the first bleeder circuit 102 with the output end of external power supply.
Optionally, in the present embodiment, second switch 103 can be triode, and the first end of second switch 103 is three poles
The base stage of pipe, the second end of second switch 103 are the collector of triode, and the third end of second switch 103 is the hair of triode
Emitter-base bandgap grading.
Current limliting bleeder circuit 101 includes multiple current-limiting resistances, and multiple current-limiting resistances are sequentially connected in series the output in external power supply
Between end and the collector of triode；First bleeder circuit 102 includes multiple divider resistances, and multiple divider resistances are sequentially connected in series
Between the output end of external power supply and the base stage of triode.Optionally, in the present embodiment, the resistance value of current-limiting resistance is relative to existing
The resistance value of divider resistance in some start-up circuits wants small, by using the current-limiting resistance of small resistance value, can greatly shorten power supply
The startup time of IC 20 makes power supply realize quickly and starts.
Further, switching circuit 10 can also include one-way conduction device 104, and one-way conduction device 104 is connected to second and opens
Between closing 103 third end and the feeder ear of power supply IC 20, for being connected when second switch 103 is connected, and to power supply IC
20 feeder ear transmission start voltage.
Optionally, in the present embodiment, one-way conduction device 104 can be diode, wherein the anode of diode and second
The third end (emitter of triode) of switch 103 connects, and the cathode of diode is connect with the feeder ear of power supply IC 20.Wherein,
The model of diode can select to determine that the utility model does not make specific requirement according to actual circuit design requirement.
In the present embodiment, switching circuit 10 can also include the second threshold circuit 107 and third switch 106,
Third switch 106 includes first end, second end and third end.
The first end of third switch 106 is connect with by the second threshold circuit 107 with the second bleeder circuit 30, third switch
106 second end is connect with the first end of second switch 103, the third end ground connection of third switch 106.
Optionally, the first threshold circuit 105 may include the first zener diode, and the second threshold circuit 107 may include
Second zener diode, third switch 106 can be third metal-oxide-semiconductor；The first end of third switch 106 is the grid of third metal-oxide-semiconductor
Pole, the second end of third switch 106 are the drain electrode of third metal-oxide-semiconductor, and the third end of third switch 106 is the source electrode of third metal-oxide-semiconductor；
The cathode of first zener diode is connect with the drain electrode of the first end of second switch 103 and third metal-oxide-semiconductor, the first zener diode
Plus earth；The source electrode of third metal-oxide-semiconductor is grounded, and the grid of third metal-oxide-semiconductor is connect with the anode of the second zener diode, and second
The cathode of zener diode is connect with the second bleeder circuit 30.It is to be appreciated that in the present embodiment, the first threshold circuit 105
It is equipped with threshold voltage with the second threshold circuit 107, the door set by the first threshold circuit 105 and the second threshold circuit 107
Voltage limit can be such that the first end of second switch 103 and the first end of third switch 106 is clamped near threshold voltage, when
When the voltage of the first end of two switches 103 reaches the threshold voltage of the first threshold circuit 105 setting, second switch 103 is just connected.
Similarly, when the voltage of the first end of third switch 106 reaches the threshold voltage of the second threshold circuit 107 setting, third switch
106 are just connected.Wherein, the threshold voltage of the first threshold circuit 105 and the second threshold circuit 107 is specifically set according to circuit, this
Utility model does not make specific requirement.
In the present embodiment, switching circuit 10 can also include filter circuit 108, and filter circuit 108 includes filter capacitor
And filter resistance, the first end of filter capacitor are connected between third switch 106 and the second threshold circuit 107, filter capacitor
Second end is grounded, and filter resistance parallel connection is connected in parallel with filter capacitor.
Second bleeder circuit 30 may include in the present embodiment third diode, the 5th diode and the 7th resistance,
The anode of third diode and the first end of auxiliary winding connect, and the cathode of third diode passes through the 7th resistance and the five or two pole
The anode of pipe connects, and the cathode of the 5th diode is connect with switching circuit 10.
The low-power consumption of the utility model starts control circuit, divides input voltage by using the lower resistance of resistance value
Current limliting is pressed, starts voltage to power supply IC 20 to provide, and then greatly shorten the startup time of power supply IC 20, makes power supply IC 20
Reach quick startup, reduces power consumption, while after the startups of power supply IC 20, can be provided by the second bleeder circuit 30 second point
Automatic lockout switch circuit 10 is pressed, the generated no-load power consumption in 20 courses of work of power supply IC is avoided, improves the whole of power supply
Engine efficiency, while the reliability of power supply also can be improved, extend the service life of power supply.
Refering to Fig. 3, Fig. 3 is the circuit theory that a kind of low-power consumption provided by the utility model starts one embodiment of control circuit
Figure.It is PSR topological structures that the low-power consumption of the present embodiment, which starts control circuit, and power supply IC 20 can be the power supply IC of SY5800
The feeder ear of 20, power supply IC 20 are VIN (i.e. PIN6 pins).
Wherein, current limliting bleeder circuit 101 includes resistance R8 and resistance R6, and the first bleeder circuit 102 includes resistance R3 and electricity
R4 is hindered, second switch 103 includes triode Q2, and one-way conduction device 104 includes diode D2, and the first threshold circuit 105 includes the
One zener diode ZD1, third switch 106 include third metal-oxide-semiconductor Q3, and the second threshold circuit 107 includes the second zener diode
ZD2, filter circuit 108 include filter capacitor C6 and filter resistance R14, and the second bleeder circuit 30 includes the 5th diode D5, the
Seven resistance R7 and third diode D3, third bleeder circuit include resistance R5, resistance R10 and capacitance C5, and first switch 50 includes
First metal-oxide-semiconductor Q1；The input voltage that external power supply provides is 90Vac.
Switching circuit 10 further includes resistance R9, wherein resistance R9 is connected on the partial pressure electricity of the second zener diode ZD2 and second
Between road 30.As shown in figure 3, the output end of external power supply is connect with three branches respectively, this three branches are respectively current limliting point
Connecting wire between volt circuit 101, the first end of the primary side winding of the first bleeder circuit 102 and transformer T1, wherein limit
Resistance R8 and resistance R6 in flow point volt circuit 101 be sequentially connected in series output end in external circuit and triode Q2 collector it
Between, the emitter of triode Q2 is connect with the anode of diode D2, the feeder ear of the cathode and power supply IC 20 of diode D2
(VIN) it connects, the base stage of triode Q2 is connect with the cathode of the first zener diode ZD1, the anode of the first zener diode ZD1
The base stage of ground connection, triode Q2 also passes sequentially through resistance R4 and the connection of the output end of resistance R3 and external power supply；Triode Q2's
Base stage is also connect with the drain electrode of third metal-oxide-semiconductor Q3.
The source electrode of third metal-oxide-semiconductor Q3 is grounded, and the grid of third metal-oxide-semiconductor Q3 is connect with the anode of the second zener diode ZD2,
The grid of third metal-oxide-semiconductor Q3 is also grounded by filter capacitor C6, and filter resistance R14 is in parallel with filter capacitor C6；Second voltage stabilizing two
The cathode of pole pipe ZD2 is connect by resistance R9 with the cathode of the 5th diode D5.
The anode of 5th diode D5 is connect by resistance R7 with the cathode of third diode D3, the sun of third diode D3
Pole is connect with the first end of the auxiliary winding of transformer T1, the first end of the auxiliary winding of transformer T1 also with resistance R10 one
End connection, the other end of resistance R10 are connect by resistance R5 with the second end of capacitance C5, first end and the power supply IC of capacitance C5
20 feeder ear (VIN) connection, the ground terminal ground connection of power supply IC 20.
As shown in figure 3, the control signal that power supply IC 20 is exported upon actuation drives end to export (i.e. in Fig. 3 by it
DRV, PIN5 pin), and it is in series with resistance R11 between the driving end and the grid of the first metal-oxide-semiconductor Q1 of power supply IC 20, wherein
It is also parallel with diode D4 and resistance R40 at the both ends of resistance R11, specifically, the one end resistance R40 is connected to resistance R11 and
Between the grid of one metal-oxide-semiconductor Q1, the other end of resistance R40 is connect with the anode of diode D4, the cathode and resistance of diode D4
R11 drives the connecting node at end to connect with power supply IC 20, and the source electrode of the first metal-oxide-semiconductor Q1 is grounded by resistance R13.
From the figure 3, it may be seen that the concrete operating principle of the embodiment is, after power supply energization, by resistance R8 and resistance R6 to defeated
Enter after voltage divided, generates and start voltage to the feeder ear of power supply IC 20, to give power supply IC 20 to provide initial start electricity
Pressure, and in the present embodiment, resistance R8, resistance R6, triode Q2, resistance R3, resistance R4, the first zener diode ZD1 and two
The start-up circuit time that pole pipe D2 is formed is short, when input voltage is 90Vac, starts the time less than 1s, realizes and quickly start.
After being powered, it is by resistance R8, resistance R6, triode Q2, resistance R3, resistance R4, the first zener diode ZD1 and diode D2
Power supply IC 20 provides initial voltage, after power supply IC 20 normally starts, driving end (PIN5 pins) the output control of power supply IC 20
Signal processed makes the first metal-oxide-semiconductor Q1 conductings to the first metal-oxide-semiconductor Q1, so that the secondary windings of transformer T1 is had after the first metal-oxide-semiconductor Q1 conductings
Voltage output makes load (LED light is lighted), the operating voltage (Vcc) of power supply IC 20 be provided, be become by the auxiliary winding of transformer T1
Boost voltage caused by the auxiliary winding of depressor T1 obtains the voltage of 10-25V after third diode D3 rectifications, at this moment all the way
After resistance R10, resistance R5 and capacitance C5 partial pressures, it is supplied to the feeder ear of power supply IC 20, work electricity is provided to power supply IC 20
It presses (Vcc), another way voltage makes the second zener diode ZD2 conductings after resistance R7 and the 5th diode D5, at this point, third
The grid of metal-oxide-semiconductor Q3 is also switched on after obtaining voltage, and then the base voltage of triode Q2 is pulled down to ground, and triode Q2, which enters, to be cut
Only state (not working) at this time will not have circuit any loss, i.e., after the normal works of power supply IC 20, switching circuit 10 stops
It only works, does not generate any loss.
In a specific example, if the parameter using this circuit is set as：Input voltage opens between 90-305Vac
The dynamic time can reach less than or equal to 750ms, and standby power is in 0.5W, and efficiency is higher than traditional circuit by 1.5% or more, in this way
Not only meet energy requirements, but also can effectively shorten energization to start time, no-load power consumption, improve the working efficiency of complete machine, and can be with
It improves the reliability of power supply and extends the service life of power supply.
The utility model additionally provides a kind of power supply, including above-described low-power consumption starts control circuit.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should all belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of low-power consumption starts control circuit, which is characterized in that including switching circuit, transformer, the second bleeder circuit, first
Switch and the power supply IC being connect with the first switch；
The transformer, including primary side winding and auxiliary winding, the first end of the primary side winding and the output end of external power supply
Connection, the second end of the primary side winding are grounded by the first switch；The first end of the auxiliary winding passes through described
Two bleeder circuits are connect with the switching circuit, the second end ground connection of the auxiliary winding；
The switching circuit is connect with the feeder ear of the output end of the external power supply and the power supply IC respectively, for described
Power supply is connected when connecting the external power supply, and after the input voltage that the external power supply exports is divided, and output starts
Voltage controls the power supply IC to the power supply IC and quickly starts；
The power supply IC outputs control signals to first switch control described the after quickly starting according to the startup voltage
One switch conduction, so that the auxiliary winding of the transformer generates boost voltage, the boost voltage is through the second partial pressure electricity
The second partial pressure of road partial pressure output to the switching circuit controls the switching circuit shutdown.
2. low-power consumption according to claim 1 starts control circuit, which is characterized in that further include：
Third bleeder circuit is connected between the feeder ear and the first end of the auxiliary winding of the power supply IC, in institute
After stating power supply IC startups, the boost voltage generated to the auxiliary winding divides, and output third is divided to the power supply IC
Feeder ear, to the power supply IC provide operating voltage.
3. low-power consumption according to claim 1 starts control circuit, which is characterized in that the switching circuit includes current limliting point
Volt circuit, the first bleeder circuit, second switch and the first threshold circuit；
The second switch includes first end, second end and third end；
The current limliting bleeder circuit is connected between the output end of the external power supply and the second end of the second switch, described
The third end of second switch is connect with the feeder ear of the power supply IC, and the first end of the second switch passes through first thresholding
The first end of circuit ground, the second switch is also connected by the output end of first bleeder circuit and the external power supply
It connects.
4. low-power consumption according to claim 3 starts control circuit, which is characterized in that the second switch is triode,
The first end of the second switch is the base stage of the triode, and the second end of the second switch is the current collection of the triode
Pole, the third end of the second switch are the emitter of the triode；
The current limliting bleeder circuit includes multiple current-limiting resistances, and the multiple current-limiting resistance is sequentially connected in series in the external power supply
Between output end and the collector of the triode；
First bleeder circuit includes multiple divider resistances, and the multiple divider resistance is sequentially connected in series in the external power supply
Between output end and the base stage of the triode.
5. low-power consumption according to claim 3 or 4 starts control circuit, which is characterized in that the switching circuit further includes
One-way conduction device, the one-way conduction device are connected between the third end of the second switch and the feeder ear of the power supply IC,
The startup voltage is transmitted for being connected when the second switch is connected, and to the feeder ear of the power supply IC.
6. low-power consumption according to claim 3 starts control circuit, which is characterized in that the switching circuit further includes second
Threshold circuit and third switch,
The third switch includes first end, second end and third end；
The first end of the third switch is connect by second threshold circuit with second bleeder circuit with described, described
The second end of third switch is connect with the first end of the second switch, the third end ground connection of the third switch.
7. low-power consumption according to claim 6 starts control circuit, which is characterized in that first threshold circuit includes the
One zener diode, second threshold circuit include the second zener diode, and the third switch is third metal-oxide-semiconductor；
The first end of the third switch is the grid of the third metal-oxide-semiconductor, and the second end of the third switch is the third
The third end of the drain electrode of metal-oxide-semiconductor, the third switch is the source electrode of the third metal-oxide-semiconductor；
The cathode of first zener diode is connect with the drain electrode of the first end of the second switch and the third metal-oxide-semiconductor,
The plus earth of first zener diode；The source electrode of the third metal-oxide-semiconductor is grounded, the grid of the third metal-oxide-semiconductor and institute
The anode connection of the second zener diode is stated, the cathode of second zener diode is connect with second bleeder circuit.
8. low-power consumption according to claim 6 starts control circuit, which is characterized in that the switching circuit further includes filtering
Circuit, the filter circuit include filter capacitor and filter resistance, and the first end of the filter capacitor is connected to the third and opens
It closes between second threshold circuit, the second end of the filter capacitor is grounded, the filter resistance and the filter capacitor
It is connected in parallel.
9. low-power consumption according to claim 1 starts control circuit, which is characterized in that second bleeder circuit includes the
The anode of three diodes, the 5th diode and the 7th resistance, the third diode is connect with the first end of the auxiliary winding,
The cathode of the third diode is connect by the 7th resistance with the anode of the 5th diode, the 5th diode
Cathode connect with the switching circuit.
10. a kind of power supply, which is characterized in that start control circuit including claim 1-9 any one of them low-power consumption.
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| CN201721708364.0U CN207720022U (en) | 2017-12-08 | 2017-12-08 | A kind of low-power consumption starts control circuit and power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445117A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Direct current inputs reverse connection prevention protection circuit |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445117A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Direct current inputs reverse connection prevention protection circuit |
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