CN207965722U - The control circuit of PFC busbar voltages - Google Patents
The control circuit of PFC busbar voltages Download PDFInfo
- Publication number
- CN207965722U CN207965722U CN201820484445.5U CN201820484445U CN207965722U CN 207965722 U CN207965722 U CN 207965722U CN 201820484445 U CN201820484445 U CN 201820484445U CN 207965722 U CN207965722 U CN 207965722U
- Authority
- CN
- China
- Prior art keywords
- voltage
- pfc
- circuit
- resistance
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses a kind of control circuits of PFC busbar voltages, including：Input terminal, pfc controller and output end, it further include a control unit, described control unit is arranged between the input terminal, pfc controller and output end, described control unit is for detecting input voltage and accordingly adjusting busbar voltage according to the size of the input voltage detected, wherein, when input voltage is less than preset voltage value, input voltage is reduced and is reduced described in described control unit control bus voltage follow.The utility model embodiment can realize that busbar voltage follows the purpose of adjusting when pfc circuit inputs low-voltage, it solves the problems, such as to cause pfc circuit pressure difference bigger due to busbar voltage constant output when inputting low-voltage, simultaneously, the reduction of pfc circuit pressure difference means that the Wen Sheng of pfc circuit is significantly improved, the reliability for greatly strengthening switching power circuit improves the service life of Switching Power Supply.
Description
Technical field
The utility model is related to field of switch power, relate more specifically to a kind of control circuit of PFC busbar voltages.
Background technology
Currently, the form of electric energy needed for most of electrical equipment is direct current in the market, therefore, it is necessary to turn alternating current
It is changed to direct current energy, however after alternating current is rectified, power factor is relatively low, in order to improve the power factor of power supply, generally use
Circuit of power factor correction (Power Factor Correction, PFC).PFC PFC technologies can turn in exchange
Utilization rate of the power supply to alternating current is improved when being changed to direct current, you can to improve the power factor of load-side, it is humorous that input can also be reduced
Wave electric current.In the prior art, the Power Management Designs such as Switching Power Supply, LED drive power have used PFC technologies more, alternating current it is rectified it
Afterwards, then by pfc circuit, it is converted into the direct current of busbar voltage constant output, resupplies the LLC topological circuits of rear class.Wherein,
When pfc circuit input voltage is low-voltage, the busbar voltage of constant output will lead to the pressure of pfc circuit after pfc circuit
The larger problem of difference, for example, when input voltage is 90VAC, it is rectified after DC voltage value be 128V, if pfc circuit is permanent
Surely the busbar voltage exported is 400V, then pressure difference 272V；When input voltage be 277VAC when, it is rectified after DC voltage value be
392V, since the busbar voltage of pfc circuit constant output is 400V, then pressure difference 8V.It follows that input low-voltage will cause
The larger problem of the pressure difference of pfc circuit, so as to cause problem of temperature rise, however, in large power supply design, thermal design is very
Important link directly influences the service life of power supply.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of control circuits of PFC busbar voltages, can be in PFC
It realizes that busbar voltage follows the purpose of adjusting when circuit inputs low-voltage, it is constant defeated to solve busbar voltage when due to input low-voltage
The problem for going out and causing pfc circuit pressure difference bigger avoids the problem of temperature rise caused by pfc circuit pressure difference is larger.
In order to solve the above-mentioned technical problem, in a first aspect, the utility model provides a kind of control electricity of PFC busbar voltages
Road, including：Input terminal, pfc controller and output end, further include a control unit, and described control unit is arranged described defeated
Enter between end, pfc controller and output end, described control unit is used to detect input voltage and according to the input electricity detected
The size of pressure accordingly adjusts busbar voltage, wherein when input voltage is less than preset voltage value, described control unit control bus
Input voltage described in voltage follow is reduced and is reduced.
In the control circuit of PFC busbar voltages provided by the utility model, described control unit includes an input voltage
Detection circuit, a voltage follow control circuit, a PFC loop control circuits and a varying DC link voltage circuit；The input
Voltage detecting circuit is connected with the input terminal for detecting input voltage；The both ends of the PFC loop control circuits respectively with
The first pin and second pin of the pfc controller are connected for preventing the voltage of first pin to fluctuate；Institute
The one end for stating varying DC link voltage circuit is connected with first pin, and the other end is connected with the output end, is used for basis
First pin and the voltage follow control circuit adjust busbar voltage；The voltage follow control circuit simultaneously with institute
It states input voltage detection circuit, PFC loop control circuits and the varying DC link voltage circuit to be connected, for working as the input
The voltage value that voltage detecting circuit is inputted is less than electric with the PFC loop control circuits and the busbar when preset voltage value
Voltage regulator circuit is connected so that input voltage described in control bus voltage follow reduces and reduces.
In the control circuit of PFC busbar voltages provided by the utility model, the input voltage detection circuit includes the
One resistance, second resistance, 3rd resistor, the 4th resistance and the first diode, the first resistor, second resistance, third electricity
Resistance and the 4th resistance are connected to after being sequentially connected in series between the input terminal and ground terminal, and the anode of first diode is connected to
Between 4th resistance and 3rd resistor, cathode is connected to the voltage follow control circuit.
In the control circuit of PFC busbar voltages provided by the utility model, the input voltage detection circuit further includes
First capacitance, one end of first capacitance are connected with the cathode of first diode, other end ground connection.
In the control circuit of PFC busbar voltages provided by the utility model, the voltage follow control circuit includes one
Triode and the 5th resistance, the control terminal of the triode are connected with the input voltage detection circuit, input terminal and institute
State the 5th resistance one end be connected, output end is connected with the first pin of the pfc controller, the 5th resistance it is another
Termination power end.
In the control circuit of PFC busbar voltages provided by the utility model, the voltage follow control circuit further includes
The anode of second diode, second diode is connected with the control terminal, and cathode connects power end.
In the control circuit of PFC busbar voltages provided by the utility model, the triode is PNP triode.
In the control circuit of PFC busbar voltages provided by the utility model, the PFC loop control circuits include the 7th
Resistance, the second capacitance and third capacitance, the 7th resistance is in parallel with the third capacitance after connecting with the second capacitance, described
One end of third capacitance is connected to first pin, and the other end is connected to second pin.
In the control circuit of PFC busbar voltages provided by the utility model, the varying DC link voltage circuit includes the
Eight resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor, the 8th resistance, the 9th resistance, the tenth
Resistance and eleventh resistor are connected to after being sequentially connected in series between the output end and ground terminal, and one end of the twelfth resistor connects
It is connected between the eleventh resistor and the tenth resistance and is connected to first pin, other end ground connection.
In the control circuit of PFC busbar voltages provided by the utility model, the control circuit further includes the 4th capacitance,
One end of 4th capacitance is connected with the output end, other end ground connection.
Compared with prior art, a kind of control circuit of PFC busbar voltages provided by the utility model, the circuit include
Input terminal, pfc controller and output end, further include a control unit, and described control unit is arranged in the input terminal, PFC
Between controller and output end, described control unit is for detecting input voltage and according to the size of the input voltage detected
It is corresponding to adjust busbar voltage, wherein when input voltage is less than preset voltage value, described control unit control bus voltage follow
The input voltage is reduced and is reduced, so as to realize that busbar voltage follows the mesh of adjusting when pfc circuit inputs low-voltage
, it solves the problems, such as to cause pfc circuit pressure difference bigger due to busbar voltage constant output when inputting low-voltage, meanwhile, PFC
The reduction of circuit pressure difference means that the Wen Sheng of pfc circuit is significantly improved, and greatly strengthens the reliable of switching power circuit
Property, improve the service life of Switching Power Supply.
By description below and in conjunction with attached drawing, the utility model will become more fully apparent, these attached drawings are for explaining this
The embodiment of utility model.
Description of the drawings
Fig. 1 is a kind of frame principle figure of the control circuit of PFC busbar voltages provided by the utility model；
Fig. 2 is a kind of physical circuit figure of the control circuit of PFC busbar voltages provided by the utility model.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, the technical solution in embodiment is carried out it is clear, complete
Ground describes, and similar reference numerals represent similar component in attached drawing.Obviously, will be described below embodiment is only this practicality
Novel a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without creative efforts belongs to the model of the utility model protection
It encloses.
It should be appreciated that ought use in this specification and in the appended claims, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, element, component and/or its presence or addition gathered.
It is also understood that herein term as used in this specification merely for the sake of description specific embodiment purpose and
It is not intended to limit the utility model.As used in the utility model specification and appended book, remove
Non- context clearly indicates other situations, and otherwise " one " of singulative, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in this specification and in the appended claims refers to phase
Any combinations and all possible combinations of one or more of item listed are associated with, and include these combinations.
A kind of control circuit 100 of PFC busbar voltages provided by the utility model includes an input terminal 13, PFC controls
Device 12 and an output end 14, further include a control unit 11, and the setting of described control unit 11 is controlled in the input terminal 13, PFC
Between device 12 and output end 14 processed, for detecting input voltage and accordingly adjusting mother according to the size of the input voltage detected
Line voltage, wherein when input voltage is less than preset voltage value, inputted described in 11 control bus voltage follow of described control unit
Voltage is reduced and is reduced.The control circuit 100 of the PFC busbar voltages can realize busbar electricity when pfc circuit inputs low-voltage
Pressure follows the purpose of adjusting, solves to cause pfc circuit pressure difference bigger due to busbar voltage constant output when inputting low-voltage
The problem of, meanwhile, the reduction of pfc circuit pressure difference means that the Wen Sheng of pfc circuit is significantly improved, and greatly strengthens switch
The reliability of power circuit improves the service life of Switching Power Supply.
Fig. 1 is referred to, is a kind of frame principle figure of the control circuit of PFC busbar voltages provided by the utility model,
The control circuit 100 of the PFC busbar voltages includes an input terminal 13, a pfc controller 12 and an output end 14, further includes
One control unit 11, described control unit 11 are arranged between the input terminal 13, pfc controller 12 and output end 14, use
In detection input voltage and busbar voltage is accordingly adjusted according to the size of the input voltage detected, wherein when input voltage is low
When preset voltage value, input voltage described in 11 control bus voltage follow of described control unit is reduced and is reduced.The control
Unit 11 include an input voltage detection circuit 111, a voltage follow control unit 112, a PFC loop control circuits 113 with
An and varying DC link voltage circuit 114；The input terminal of the input voltage detection circuit 111 is connected with the input terminal 13,
Output end is connected with the voltage follow control circuit 112, for detecting input voltage；The voltage follow control circuit 112
Power end VCC, the input voltage detection circuit 111, PFC loop controls with the control circuit of the PFC busbar voltages simultaneously
Circuit 113 processed and the varying DC link voltage circuit 114 are connected, and are inputted for working as the input voltage detection circuit 111
Voltage value be less than preset voltage value when with the PFC loop control circuits 113 and 114 phase of varying DC link voltage circuit
It connects so that control bus voltage follow input voltage reduces and reduces；The both ends of the PFC loop control circuits 113 respectively with institute
The first pin 1 and second pin 2 for stating pfc controller 12 are connected, for preventing the voltage of first pin 1 from wave occurs
It is dynamic；One end of the varying DC link voltage circuit 114 is connected with first pin 1, the other end and 14 phase of the output end
Even, for adjusting busbar voltage according to first pin 1 and the voltage follow control circuit 112.
In the above-described embodiments, when the voltage value that the input voltage detection circuit 111 is inputted is less than preset voltage value
When, that is, when the low-voltage inputted meets the turn-on condition of the voltage follow control circuit 112, the voltage follow control circuit
112 are connected with the PFC loop control circuits 113 and the varying DC link voltage circuit 114 to control the output end
14 busbar voltage follows input voltage to reduce and reduce；When the voltage value that the input voltage detection circuit 111 is inputted not
When less than preset voltage value, i.e., input voltage is unsatisfactory for the voltage follow control circuit for high voltage or the low-voltage of input
When 112 turn-on condition, the voltage follow control circuit 112 turns off, the PFC loop control circuits 113 and the busbar
Voltage regulator circuit 114 is of coupled connections to first pin 1, and the voltage value of first pin 1 immobilizes, the output
The busbar voltage at end 14 exports steady state value.The utility model embodiment can realize busbar electricity when pfc circuit inputs low-voltage
Pressure follows the purpose of adjusting, solves to cause pfc circuit pressure difference bigger due to busbar voltage constant output when inputting low-voltage
The problem of, meanwhile, the reduction of pfc circuit pressure difference means that the Wen Sheng of pfc circuit is significantly improved, and greatly strengthens switch
The reliability of power circuit improves the service life of Switching Power Supply.
Fig. 2 is referred to, Fig. 2 is a kind of physical circuit figure of the control circuit of PFC busbar voltages provided by the utility model.
The control circuit 100 of the PFC busbar voltages includes an input terminal 13, a pfc controller 12 and an output end 14, further includes
One control unit 11, described control unit 11 are arranged between the input terminal 13, pfc controller 12 and output end 14, use
In detection input voltage and busbar voltage is accordingly adjusted according to the size of the input voltage detected, wherein when input voltage is low
When preset voltage value, input voltage described in 11 control bus voltage follow of described control unit is reduced and is reduced.
Described control unit 11 includes an input voltage detection circuit 111, a voltage follow control unit 112, a PFC rings
Road control circuit 113 and a varying DC link voltage circuit 114.Wherein, the input terminal of the input voltage detection circuit 111 with
The input terminal 13 is connected, and output end is connected with voltage follow control unit 112, for detecting input voltage.Specifically, institute
It includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and first to state input voltage detection circuit 111
Diode D1, the first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 are connected to institute after being sequentially connected in series
It states between input terminal 13 and ground terminal COM, the anode of the first diode D1 is connected to the 4th resistance R4 and 3rd resistor
Between R3, cathode is connected to the voltage follow control circuit 112, the input voltage detection circuit 111 be used for according to
State all electric resistance partial pressure detection input voltages.In some feasible embodiments, such as in the present embodiment, the input voltage inspection
Slowdown monitoring circuit 111 further includes the first capacitance C1, and one end of the first capacitance C1 is connected with the cathode of the first diode D1,
The other end is grounded, and for filtering, that is, is used to inhibit the fluctuation of input voltage, so that the voltage follow control unit 112 obtains
The voltage of smooth steady.
The voltage follow control unit 112 simultaneously with the power end VCC of the control circuit 100 of the PFC busbar voltages,
The input voltage detection circuit 111, the PFC loop control circuits 113 and 114 phase of varying DC link voltage circuit
Even, when voltage value for being inputted when the input voltage detection circuit 111 is less than preset voltage value with the PFC loops control
Circuit 113 processed and the varying DC link voltage circuit 114 are connected and are reduced with input voltage described in control bus voltage follow
And it reduces.Specifically, the voltage follow control circuit 112 includes a triode Q1 and the 5th resistance R5, the triode
The control terminal of Q1 is connected as the input terminal of the voltage follow control circuit 112 with the input voltage detection circuit 111,
Input terminal is connected with one end of the 5th resistance R5, and output end is connected with PFC loop control circuits 113 and is connected to described
First pin 1 of pfc controller 12, another termination power end VCC of the 5th resistance R5；The voltage follow control circuit
112 are used for when the voltage value that the input voltage detection circuit is inputted is less than preset voltage value, the triode Q1 conductings,
The voltage follow control circuit 112 and the PFC loop control circuits 113 and 114 phase of varying DC link voltage circuit
It connects so that control bus voltage follow input voltage reduces and reduces.In some feasible embodiments, such as in the present embodiment,
The preset voltage value is determined by the power end VCC and the 5th resistance.In some feasible embodiments, such as this
Embodiment, the triode Q1 are PNP triode, the control terminal of the base stage of the PNP triode as the triode Q1,
Input terminal of the emitter as triode Q1, output end of the collector as triode Q1.Specifically, when the input voltage
When the voltage value that detection circuit is inputted is not less than preset voltage value, i.e., the voltage of the described base stage is more than the power end VCC's
Voltage value, the triode Q1 shutdowns, the voltage follow control unit 112 and the PFC loop control circuits 113 and institute
The disconnection of varying DC link voltage circuit 114 is stated, the PFC loop control circuits 113 are connected with the varying DC link voltage circuit 114
Control the busbar voltage output steady state value；When the voltage value that the input voltage detection circuit is inputted is less than preset voltage value
When, i.e., the voltage of the described base stage is less than the voltage value of the power end VCC, the triode Q1 conductings, the voltage follow control
Unit 112 processed is connected with the PFC loop control circuits 113 and the varying DC link voltage circuit 114, to control mother
Line voltage follows input voltage to reduce and reduce.In some feasible embodiments, for example, the present embodiment, the voltage follow control
Circuit 112 processed further includes the second diode D2, and the anode of the second diode D2 is connected with the control terminal, and cathode connects electricity
Source VCC is used for clamper.In other feasible embodiments, for example, the present embodiment, the voltage follow control circuit 112
Further include the 6th resistance R6, one end of the 6th resistance R6 is connected with the anode of the second diode D2, another termination
Ground terminal COM.
The PFC loop control circuits 113 simultaneously with the pfc controller 12, the voltage follow control circuit 112 with
And the varying DC link voltage circuit 114 is connected, for inhibiting the voltage of first pin to fluctuate, with fixation described the
The current potential of one pin.Specifically, the PFC loop control circuits 113 include the 7th resistance R7, the second capacitance C2 and the
Three capacitance C3, the 7th resistance R7 is in parallel with the third capacitance C3 after connecting with the second capacitance C2, the third capacitance C3
One end be connected with first pin 1 and be connected to the output end of the triode Q1 and the varying DC link voltage circuit
114 input terminal, the other end are connected with second pin 2.In some feasible embodiments, for example, the present embodiment, the PFC
Controller 12 is that TDA4863 controls chip, and the TDA4863 chips have eight pins, including INV pins, COMP pins, MULT
Pin, CS pins, VCC pin, OUT pins, GND pin, ZCD pins.Wherein, first pin is INV pins, described the
Two pins are COMP pins.
The varying DC link voltage circuit 114 simultaneously with the ground terminal COM of the control circuit 100 of the PFC busbar voltages, defeated
Outlet 14, the voltage follow control circuit 112 and the PFC loop control circuits 113 are connected, for according to described first
The voltage value of pin 1 and the voltage follow control circuit 112 adjust busbar voltage.Specifically, the varying DC link voltage
Circuit includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11 and twelfth resistor R12, described
8th resistance R8, the 9th resistance R9, the tenth resistance R10 and eleventh resistor R11 are connected to the output end after being sequentially connected in series
Between 14 and ground terminal COM, one end of the twelfth resistor R12 be connected to the eleventh resistor R11 and the tenth resistance R10 it
Between and be connected to first pin 1, other end COM ground connection.
In some feasible embodiments, the control circuit 100 of the PFC busbar voltages further includes the 4th capacitance C4, institute
The one end for stating the 4th capacitance is connected with the output end 14, other end ground connection, for filtering.
In the above-described embodiments, design provide one kind can pfc circuit input low-voltage when realize busbar voltage with
With the control circuit 100 of the PFC busbar voltages of adjusting, the PFC busbar electricity may be implemented in a control unit 11 of program design
The control circuit 100 of pressure controls the work(that busbar voltage follows the input voltage to reduce in input voltage when low-voltage
Can, cause pfc circuit pressure difference bigger to busbar voltage constant output when solving the problems, such as due to input low-voltage, together
When, the reduction of pfc circuit pressure difference means that the Wen Sheng of pfc circuit is significantly improved, and greatly strengthens switching power circuit
Reliability, improve the service life of Switching Power Supply.
Continuing with referring to Fig. 2, the following detailed description of a kind of control circuit of PFC busbar voltages provided by the utility model
100 operation principle.The control circuit 100 of the PFC busbar voltages includes an input terminal 13, a pfc controller 12 and one
Output end 14, further includes a control unit 11, the setting of described control unit 11 the input terminal 13, pfc controller 12 and
Between output end 14, for detecting input voltage and accordingly adjusting busbar voltage according to the size of the input voltage detected,
In, when input voltage is less than preset voltage value, input voltage described in described control unit control bus voltage follow reduce and
It reduces.
Input low level：When the voltage value that the input voltage detection circuit is inputted is less than preset voltage value, i.e. institute
The voltage for stating base stage is less than the voltage value of the power end VCC, the triode Q1 conductings, the voltage follow control unit
112 are connected with the PFC loop control circuits 113 and the varying DC link voltage circuit 114, the voltage follow control
The voltage value of the 5th resistance R5 on circuit 112 adjusts the busbar voltage jointly with the voltage value of first pin 1, described
The voltage value of first pin 1 remains unchanged, the VA characteristic curve on triode Q1 in the voltage follow control circuit 112
The VA characteristic curve of the first diode D1 of the input voltage detection circuit 111 is followed to change and change, to control mother
Line voltage follows the input voltage to reduce and reduce.
Input high level：When the voltage value that the input voltage detection circuit is inputted is not less than preset voltage value, i.e.,
The voltage of the base stage is more than the voltage value of the power end VCC, the triode Q1 shutdowns, the voltage follow control unit
112 do not work, the voltage follow control unit 112 and the PFC loop control circuits 113 and the varying DC link voltage
Circuit 114 disconnects, and the PFC loop control circuits 113 are connected with the varying DC link voltage circuit 114, since the PFC is controlled
The voltage of first pin 1 of device processed is constant, eleventh resistor and the twelfth resistor both ends of the varying DC link voltage circuit 114
Voltage immobilize, when its resistance value immobilizes, the electric current on the varying DC link voltage circuit 114 is constant, therefore, institute
The busbar voltage for stating the output of output end 13 remains unchanged.
The utility model is described above in association with preferred embodiment, but the utility model is not limited to above take off
The embodiment shown, and the modification that various essence according to the present utility model carry out should be covered.
Claims (10)
1. a kind of control circuit of PFC busbar voltages, including input terminal, pfc controller and output end, which is characterized in that also
Including a control unit, described control unit is arranged between the input terminal, pfc controller and output end, the control
Unit is for detecting input voltage and accordingly adjusting busbar voltage according to the size of the input voltage detected, wherein works as input
When voltage is less than preset voltage value, input voltage described in described control unit control bus voltage follow is reduced and is reduced.
2. the control circuit of PFC busbar voltages according to claim 1, it is characterised in that：Described control unit includes one
Input voltage detection circuit, a voltage follow control circuit, a PFC loop control circuits and a varying DC link voltage circuit；
The input voltage detection circuit is connected with the input terminal for detecting input voltage；The two of the PFC loop control circuits
End is connected respectively with the first pin and second pin of the pfc controller for preventing the voltage of first pin from occurring
Fluctuation；One end of the varying DC link voltage circuit is connected with first pin, and the other end is connected with the output end, uses
According to first pin and voltage follow control circuit adjusting busbar voltage；The voltage follow control circuit is same
When be connected with the input voltage detection circuit, PFC loop control circuits and the varying DC link voltage circuit, for working as institute
State when voltage value that input voltage detection circuit is inputted is less than preset voltage value with PFC loop control circuits and described
Varying DC link voltage circuit is connected so that input voltage described in control bus voltage follow reduces and reduces.
3. the control circuit of PFC busbar voltages according to claim 2, it is characterised in that：The input voltage measurement electricity
Road includes first resistor, second resistance, 3rd resistor, the 4th resistance and the first diode, the first resistor, the second electricity
Resistance, 3rd resistor and the 4th resistance are connected to after being sequentially connected in series between the input terminal and ground terminal, first diode
Anode is connected between the 4th resistance and 3rd resistor, and cathode is connected to the voltage follow control circuit.
4. the control circuit of PFC busbar voltages according to claim 3, it is characterised in that：The input voltage measurement electricity
Road further includes the first capacitance, and one end of first capacitance is connected with the cathode of first diode, other end ground connection.
5. the control circuit of PFC busbar voltages according to claim 2, it is characterised in that：The voltage follow control electricity
Road includes a triode and the 5th resistance, and the control terminal of the triode is connected with the input voltage detection circuit, defeated
Enter end with one end of the 5th resistance to be connected, output end is connected with the first pin of the pfc controller, the 5th electricity
Another termination power end of resistance.
6. the control circuit of PFC busbar voltages according to claim 5, it is characterised in that：The voltage follow control electricity
Road further includes the second diode, and the anode of second diode is connected with the control terminal, and cathode connects power end.
7. the control circuit of PFC busbar voltages according to claim 5, it is characterised in that：The triode is tri- poles PNP
Pipe.
8. the control circuit of PFC busbar voltages according to claim 2, it is characterised in that：The PFC loop control circuits
Including the 7th resistance, the second capacitance and third capacitance, the 7th resistance connect with the second capacitance after with the third capacitance
One end of parallel connection, the third capacitance is connected to first pin, and the other end is connected to second pin.
9. the control circuit of PFC busbar voltages according to claim 2, it is characterised in that：The varying DC link voltage electricity
Road includes the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor, the 8th resistance, the 9th electricity
Resistance, the tenth resistance and eleventh resistor are connected to after being sequentially connected in series between the output end and ground terminal, the twelfth resistor
One end be connected between the eleventh resistor and the tenth resistance and be connected to first pin, other end ground connection.
10. the control circuit of PFC busbar voltages according to claim 2, it is characterised in that：The control circuit further includes
One end of 4th capacitance, the 4th capacitance is connected with the output end, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820484445.5U CN207965722U (en) | 2018-04-03 | 2018-04-03 | The control circuit of PFC busbar voltages |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820484445.5U CN207965722U (en) | 2018-04-03 | 2018-04-03 | The control circuit of PFC busbar voltages |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207965722U true CN207965722U (en) | 2018-10-12 |
Family
ID=63727344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820484445.5U Active CN207965722U (en) | 2018-04-03 | 2018-04-03 | The control circuit of PFC busbar voltages |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207965722U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304024A (en) * | 2018-04-03 | 2018-07-20 | 深圳茂硕电子科技有限公司 | The control circuit of PFC busbar voltages |
| CN111200353A (en) * | 2018-11-19 | 2020-05-26 | 无锡华润矽科微电子有限公司 | Driving circuit applied to switch tube control |
-
2018
- 2018-04-03 CN CN201820484445.5U patent/CN207965722U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108304024A (en) * | 2018-04-03 | 2018-07-20 | 深圳茂硕电子科技有限公司 | The control circuit of PFC busbar voltages |
| CN108304024B (en) * | 2018-04-03 | 2024-04-16 | 深圳茂硕电子科技有限公司 | Control circuit of PFC bus voltage |
| CN111200353A (en) * | 2018-11-19 | 2020-05-26 | 无锡华润矽科微电子有限公司 | Driving circuit applied to switch tube control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101707828B (en) | Constant-current source driving circuit with open circuit protection and adopting LED | |
| CN102628889B (en) | Voltage sampling circuit | |
| CN106972769A (en) | A kind of light current electrical load overvoltage crowbar | |
| CN206323126U (en) | A kind of AC overvoltage crowbars with runback bit function | |
| CN207965722U (en) | The control circuit of PFC busbar voltages | |
| CN103166175A (en) | Input overvoltage protection circuit for light-emitting diode (LED) driving power supply | |
| CN205304229U (en) | Relay control protection electric circuit and tame electric installation | |
| CN205453116U (en) | Survival voltage bleeder circuit and electric rice cooker | |
| CN103023314B (en) | Buck-boost switching power supply and controller thereof | |
| CN102778849B (en) | Switching on and shutting down control circuit, electronic equipment and on-off control method | |
| CN203870427U (en) | Low-electricity consumption control circuit in standby state | |
| CN103220845A (en) | Alternating current LED drive circuit capable of adjusting working voltage range | |
| CN106887904A (en) | A kind of wireless electric energy transmission device with overvoltage protection | |
| CN108899876A (en) | The short circuit protection system at current detecting end in Switching Power Supply | |
| CN206024154U (en) | LED light modulating devices and LED drive power | |
| CN208861199U (en) | A kind of multilevel decompression voltage regulator circuit with clamper function | |
| CN207531122U (en) | A kind of LED fishing lamps power supply output switching circuit | |
| CN111023395A (en) | Monitoring circuit and air conditioner | |
| CN101847937A (en) | Power module | |
| CN202503439U (en) | Capacitance-resistance voltage reduction circuit of low power supply | |
| CN102958248B (en) | A kind of LED illumination circuit | |
| CN202696482U (en) | Power supply circuit for leakage circuit breaker | |
| CN105515357B (en) | A kind of DCDC current-limiting circuits | |
| CN108304024A (en) | The control circuit of PFC busbar voltages | |
| CN102457184B (en) | Voltage conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |