CN206323293U - A kind of PFC sample circuits and pfc circuit - Google Patents
A kind of PFC sample circuits and pfc circuit Download PDFInfo
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- CN206323293U CN206323293U CN201621408820.5U CN201621408820U CN206323293U CN 206323293 U CN206323293 U CN 206323293U CN 201621408820 U CN201621408820 U CN 201621408820U CN 206323293 U CN206323293 U CN 206323293U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model is related to switch power technology field, a kind of PFC sample circuits are disclosed, PFC sample circuits include ac voltage input, IC voltage samples reference edge, first resistor, voltage-regulator diode, second resistance, switching tube, 3rd resistor, the 4th resistance, the 5th resistance and PFC voltage output sampling ends；Switching tube has control end, common port and output end；Ac voltage input is connected by the negative pole of first resistor and voltage-regulator diode, and the positive pole of voltage-regulator diode is grounded by second resistance, and the positive pole of voltage-regulator diode and the control end of switching tube are connected；The common end grounding of switching tube, the output end of switching tube is connected by 3rd resistor with IC voltage sample reference edges；IC voltage samples reference edge is also connected by the 4th resistance eutral grounding, IC voltage samples reference edge by the 5th resistance with PFC voltage output sampling ends.By the PFC voltages sampled in the PFC voltage output sampling ends of AC low-tension section are relatively low, ensure that the metal-oxide-semiconductor in pfc circuit will not be damaged.
Description
Technical field
The utility model is related to switch power technology field, more particularly to a kind of PFC sample circuits and pfc circuit.
Background technology
At present, the pfc circuit of existing full alternating voltage (90VAC-264VAC) input, the PFC voltages that it is exported are usual
It is set in 380V-400V.As shown in figure 1, it is the circuit diagram of the PFC sample circuits of prior art, including IC voltage sample bases
Quasi- end PFC-IC, PFC voltage output sampling end+PFC, first resistor R1 and second resistance R2, the PFC voltage outputs sampling end
+ PFC is grounded by the first resistor R1 and the second resistance R2 of series connection, the first resistor R1 and second resistance R2's
Common port is connected to the IC voltage samples reference edge PFC-IC.PFC master controls IC passes through the IC voltage samples reference edge PFC-
IC is sampled to the output circuit of pfc circuit, and PFC-MOS drive signals are modulated by the information of voltage of sampling, from
And control PFC voltage outputs.
But, should no matter in AC low-tension section (90VAC-140VAC) or in ac high-voltage section (140VAC-264VAC)
The PFC voltages that the PFC voltage outputs sampling end+PFC of PFC sample circuits is sampled are：V1=(R1+R2) * V2/R2
(wherein：The PFC voltages that V1 is sampled by the PFC voltage outputs sampling end+PFC, V2 is the IC voltage samples reference edge
PFC-IC input voltage), by being sampled in AC low-tension section and the ac high-voltage section PFC voltage outputs sampling end+PFC
PFC voltages V1 it is identical, cause the PFC voltages V1 that is sampled in the AC low-tension section PFC voltage outputs sampling end+PFC compared with
Height, the time for causing to drive the metal-oxide-semiconductor in the pfc circuit to turn on is longer so that metal-oxide-semiconductor and inductor loss are big, it is serious to generate heat,
And cause the stress allowance deficiency of the metal-oxide-semiconductor in the pfc circuit in AC low-tension section, so that metal-oxide-semiconductor has larger
Damage risk.
Utility model content
The purpose of this utility model is to provide a kind of PFC sample circuits and pfc circuit, to solve existing PFC sample circuits
The technical problem of sampled PFC voltages can not be reduced in AC low-tension section.
In order to solve the above-mentioned technical problem, the utility model provides a kind of PFC sample circuits, the PFC sample circuits tool
There are ac voltage input, IC voltage samples reference edge and PFC voltage output sampling ends；The PFC sample circuits include the
One resistance, voltage-regulator diode, second resistance, switching tube, 3rd resistor, the 4th resistance and the 5th resistance；The switch pipe
There are control end, common port and output end；
The ac voltage input is connected by the first resistor with the negative pole of the voltage-regulator diode, the voltage stabilizing
The positive pole of diode is grounded by the second resistance, and the control end of the positive pole of the voltage-regulator diode and the switching tube connects
Connect；
The common end grounding of the switching tube, the output end of the switching tube passes through the 3rd resistor and the IC voltages
Sampling reference terminal is connected；
The IC voltage samples reference edge also passes through institute by the 4th resistance eutral grounding, the IC voltage samples reference edge
The 5th resistance is stated to be connected with the PFC voltage outputs sampling end.
Preferably, the switching tube is NPN triode；The control end of the switching tube is the NPN triode
Base stage, the common port of the switching tube is the emitter stage of the NPN triode, and the output end of the switching tube is the NPN
The colelctor electrode of triode.
Preferably, the PFC sample circuits also include the 6th resistance；
The ac voltage input is connected by the first resistor with the negative pole of the voltage-regulator diode：Institute
One end that ac voltage input is stated with the first resistor is connected, and the other end of the first resistor passes through the 6th resistance
It is connected with the negative pole of the voltage-regulator diode.
Preferably, the PFC sample circuits also include the 7th resistance；
The positive pole of the voltage-regulator diode is connected with the control end of the switching tube：The voltage-regulator diode is just
Pole is connected by the 7th resistance with the control end of the switching tube.
Preferably, the PFC sample circuits also include the 8th resistance, and the control end of the switching tube passes through described
8th resistance eutral grounding.
Preferably, the PFC sample circuits also include the first electric capacity, first electric capacity and the 8th resistance
It is in parallel.
Preferably, the PFC sample circuits also include the second electric capacity, second electric capacity and the 4th resistance
It is in parallel.
Preferably, the 5th resistance is made up of at least two resistant series.
Preferably, the 5th resistance is by the 9th resistance, the tenth resistance, the 11st resistance and the 12nd resistance string
Connection is constituted.
In order to solve identical technical problem, the utility model also provides a kind of pfc circuit, and the pfc circuit, which has, to be handed over
Flow power end and PFC voltage output ends；The pfc circuit includes IC circuits and above-mentioned PFC sample circuits；
The ac voltage input is connected with the alternating current source, the PFC voltage outputs sampling end and the PFC
Voltage output end is connected；The IC voltage samples reference edge is connected with the voltage output end of the IC circuits.
The PFC sample circuits that the utility model is provided, PFC sample circuits have ac voltage input, IC voltage samples
Reference edge and PFC voltage output sampling ends；PFC sample circuits include first resistor, voltage-regulator diode, second resistance, switch
Pipe, 3rd resistor, the 4th resistance and the 5th resistance；Switching tube has control end, common port and output end；Alternating voltage is defeated
Enter end to connect by the negative pole of first resistor and voltage-regulator diode, the positive pole of voltage-regulator diode is grounded by second resistance, voltage stabilizing
The positive pole of diode and the control end of switching tube are connected；The common end grounding of switching tube, the output end of switching tube passes through the 3rd electricity
Resistance is connected with IC voltage sample reference edges；IC voltage samples reference edge is by the 4th resistance eutral grounding, and IC voltage samples reference edge is also
It is connected by the 5th resistance with PFC voltage output sampling ends.When the alternating voltage that ac voltage input is inputted is in exchange height
When pressing section, voltage-regulator diode conducting so that switching tube is turned on, so that the PFC voltages that PFC voltage output sampling ends are sampled
It is higher；And when the alternating voltage that ac voltage input is inputted is in AC low-tension section, voltage-regulator diode cut-off so that switch
Pipe ends, so that the PFC voltages that PFC voltage output sampling ends are sampled are relatively low, the metal-oxide-semiconductor conducting in driving pfc circuit
Time it is shorter, and then cause metal-oxide-semiconductor and inductor loss is smaller, caloric value is less, and cause the PFC electricity in AC low-tension section
The stress allowance of metal-oxide-semiconductor in road is sufficient, so that it is guaranteed that metal-oxide-semiconductor will not be damaged.
Brief description of the drawings
Fig. 1 is the circuit diagram of PFC sample circuits of the prior art；
Fig. 2 is the circuit diagram of the PFC sample circuits in the utility model embodiment.
Embodiment
With reference to the accompanying drawings and examples, embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to scope of the present utility model.
As shown in Fig. 2 a kind of PFC sample circuits of the utility model preferred embodiment, the PFC sample circuits, which have, to be handed over
Flow voltage input end AC, IC voltage sample reference edge PFC-IC and PFC voltage output sampling end+PFC；The PFC samplings electricity
Road includes first resistor R1, voltage-regulator diode Z1, second resistance R2, switching tube Q1,3rd resistor R3, the 4th resistance R4 and the
Five resistance R5；The switching tube Q1 has control end, common port and output end；The ac voltage input AC passes through described
First resistor R1 is connected with the negative pole of the voltage-regulator diode Z1, and the positive pole of the voltage-regulator diode Z1 passes through the second resistance
R2 is grounded, and the positive pole of the voltage-regulator diode Z1 is connected with the control end of the switching tube Q1；The common port of the switching tube Q1
Ground connection, the output end of the switching tube Q1 is connected by the 3rd resistor R3 with the IC voltage samples reference edge PFC-IC；
The IC voltage samples reference edge PFC-IC is grounded by the 4th resistance R4, and the IC voltage samples reference edge PFC-IC is also
It is connected by the 5th resistance R5 with the PFC voltage outputs sampling end+PFC.
In the utility model embodiment, when the alternating voltage of the ac voltage input AC input is in ac high-voltage
Duan Shi, the voltage-regulator diode Z1 conductings so that the switching tube Q1 is turned on, now the PFC voltage outputs sampling end+PFC
The PFC voltages sampled are:V1=(R3//R4+R5) * V2/ (R3//R4) are (wherein：V1 be the PFC voltage outputs sampling end+
The PFC voltages that PFC is sampled, V2 is the input voltage of the IC voltage samples reference edge PFC-IC) so that the PFC
The PFC voltages V1 that voltage output sampling end+PFC is sampled is higher；And when the ac voltage input AC is in AC low-tension
Duan Shi, the voltage-regulator diode Z1 cut-offs so that the switching tube Q1 ends, now the PFC voltage outputs sampling end+PFC
The PFC voltages sampled are:V1=(R4+R5) * V2/R4, so that what the PFC voltage outputs sampling end+PFC was sampled
PFC voltages V1 is relatively low, and the time for driving the metal-oxide-semiconductor in the pfc circuit to turn on is shorter, and then causes metal-oxide-semiconductor and inductor loss
Smaller, caloric value is less, and causes the stress allowance abundance of the metal-oxide-semiconductor in the pfc circuit in AC low-tension section, so that
Ensure that metal-oxide-semiconductor will not be damaged.
Further, since in AC low-tension section, the PFC voltages V1 that the PFC voltage outputs sampling end+PFC is sampled is relatively low,
Allow to the metal-oxide-semiconductor using relatively low pressure-resistant specification, so as to reduce cost.
As shown in Fig. 2 in order that the design of the PFC sample circuits is simplified, to reduce cost, it is preferable that this implementation
The switching tube Q1 in example is NPN triode；The control end of the switching tube Q1 is the base stage of the NPN triode, described
Switching tube Q1 common port is the emitter stage of the NPN triode, and the output end of the switching tube Q1 is the NPN triode
Colelctor electrode.
As shown in Fig. 2 in order to ensure the voltage-regulator diode Z1 will not be damaged, the PFC in the present embodiment is adopted
Sample circuit also includes the 6th resistance R6；The ac voltage input AC passes through the first resistor R1 and the voltage-regulator diode
Z1 negative pole is connected：The ac voltage input AC is connected with one end of the first resistor R1, first electricity
The resistance R1 other end is connected by the 6th resistance R6 with the negative pole of the voltage-regulator diode Z1, passes through the 6th resistance R6
Partial pressure effect, the voltage of the voltage-regulator diode Z1 is reduced, so that it is guaranteed that the voltage-regulator diode Z1 will not be damaged.When
So, in the utility model embodiment, the 6th resistance R6 can be made up of multiple resistant series, to improve the 6th electricity
R6 voltage dividing ability is hindered, thereby further ensures that the voltage-regulator diode Z1 will not be damaged, does not do more repeating herein.
As shown in Fig. 2 in order to ensure the switching tube Q1 will not be damaged, the PFC sampling electricity in the present embodiment
Road also includes the 7th resistance R7；The positive pole of the voltage-regulator diode Z1 is connected with the control end of the switching tube Q1：Institute
The positive pole for stating voltage-regulator diode Z1 is connected by the 7th resistance R7 with the control end of the switching tube Q1, passes through the described 7th
Resistance R7 partial pressure effect, reduces the voltage of the control end of the switching tube Q1, so that it is guaranteed that the switching tube Q1 will not be by
Damage.
In the utility model embodiment, in order to further ensure that the switching tube Q1 will not be damaged, the present embodiment
In the PFC sample circuits also include the 8th resistance R8, the control end of the switching tube Q1 connect by the 8th resistance R8
Ground, by the shunting action of the 8th resistance R8, the electric current of the control end of the switching tube Q1 is flowed through in reduction, so that further
Ensure that the switching tube Q1 will not be damaged.
As shown in Fig. 2 in order to be filtered to the PFC sample circuits, it is preferable that the PFC in the present embodiment is adopted
It is in parallel with the 8th resistance R8 that sample circuit also includes the first electric capacity C1, the first electric capacity C1.
In the utility model embodiment, in order to be further filtered to the PFC sample circuits, it is preferable that this reality
The PFC sample circuits applied in example are also in parallel with the 4th resistance R4 including the second electric capacity C2, the second electric capacity C2.
As shown in Fig. 2 in order to improve the PFC voltage V1 that the PFC voltage outputs sampling end+PFC is sampled, the present embodiment
In the 5th resistance R5 be made up of at least two resistant series, specifically, the 5th resistance R5 in the present embodiment by
9th resistance R9, the tenth resistance R10, the 11st resistance R11 and the 12nd resistance R12 are in series, and now the PFC voltages are defeated
Go out PFC voltages V1=(R3//R4+R9+R10+R11+R12) the * V2/ (R3//R4) that sampling end+PFC is sampled, so as to improve
The PFC voltages V1 that the PFC voltage outputs sampling end+PFC is sampled.
In order to solve identical technical problem, the utility model also provides a kind of pfc circuit, and the pfc circuit, which has, to be handed over
Flow power end and PFC voltage output ends；The pfc circuit includes IC circuits and above-mentioned PFC sample circuits；The exchange
Voltage input end AC is connected with the alternating current source, the PFC voltage outputs sampling end+PFC and the PFC voltage output ends
Connection；The IC voltage samples reference edge PFC-IC is connected with the voltage output end of the IC circuits.
The operation principle of PFC sample circuits in the utility model embodiment is as follows：As the ac voltage input AC
When the alternating voltage of input is in ac high-voltage section, the voltage-regulator diode Z1 conductings so that the base stage of the NPN triode Q1
For high level, the NPN triode Q1 conducting, the PFC voltages V1=that now the PFC voltage outputs sampling end+PFC is sampled
(R3//R4+R9+R10+R11+R12) * V2/ (R3//R4), so that what the PFC voltage outputs sampling end+PFC was sampled
PFC voltages V1 is higher；And when the alternating voltage of the ac voltage input AC input is in AC low-tension section, the voltage stabilizing
Diode Z1 ends so that the base stage of the NPN triode Q1 is low level, the NPN triode Q1 cut-off, now described
PFC voltages V1=(R4+R9+R10+R11+R12) * V2/R4 that PFC voltage output sampling ends+PFC is sampled, so that institute
State the PFC voltages V1 that PFC voltage output sampling ends+PFC sampled relatively low.
To sum up, the PFC sample circuits that the utility model is provided, PFC sample circuits have ac voltage input AC, IC electricity
Press sampling reference terminal PFC-IC and PFC voltage output sampling end+PFC；PFC sample circuits include first resistor R1, voltage stabilizing two
Pole pipe Z1, second resistance R2, switching tube Q1,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5；Switching tube Q1 has control
End processed, common port and output end；Ac voltage input AC is connected by first resistor R1 with voltage-regulator diode Z1 negative pole,
Voltage-regulator diode Z1 positive pole is grounded by second resistance R2, and voltage-regulator diode Z1 positive pole connects with switching tube Q1 control end
Connect；Switching tube Q1 common end grounding, switching tube Q1 output end passes through 3rd resistor R3 and IC voltage sample reference edges PFC-
IC connections；IC voltage sample reference edge PFC-IC are grounded by the 4th resistance R4, and IC voltage sample reference edges PFC-IC also passes through
5th resistance R5 is connected with PFC voltage output sampling ends+PFC.Handed over when the alternating voltage of ac voltage input AC input is in
When flowing high pressure section, voltage-regulator diode Z1 conductings so that switching tube Q1 is turned on, so that PFC voltage output sampling end+PFC institutes
The PFC voltages V1 of sampling is higher；And when the alternating voltage of ac voltage input AC input is in AC low-tension section, voltage stabilizing two
Pole pipe Z1 ends so that switching tube Q1 ends so that the PFC voltages V1 that are sampled of PFC voltage output sampling ends+PFC compared with
Low, the time of the metal-oxide-semiconductor conducting in driving pfc circuit is shorter, and then causes metal-oxide-semiconductor and inductor loss is smaller, caloric value is less,
And make it that the stress allowance of the metal-oxide-semiconductor in AC low-tension section is sufficient, so that it is guaranteed that metal-oxide-semiconductor will not be damaged.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model know-why is not departed from, some improvement and replacement can also be made, these change
Enter and replace and also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of PFC sample circuits, it is characterised in that the PFC sample circuits have ac voltage input, IC voltage samples
Reference edge and PFC voltage output sampling ends；The PFC sample circuits include first resistor, voltage-regulator diode, second resistance,
Switching tube, 3rd resistor, the 4th resistance and the 5th resistance；The switching tube has control end, common port and output end；
The ac voltage input is connected by the first resistor with the negative pole of the voltage-regulator diode, the pole of voltage stabilizing two
The positive pole of pipe is grounded by the second resistance, and the positive pole of the voltage-regulator diode is connected with the control end of the switching tube；
The common end grounding of the switching tube, the output end of the switching tube passes through the 3rd resistor and the IC voltage samples
Reference edge is connected；
The IC voltage samples reference edge is by the 4th resistance eutral grounding, and the IC voltage samples reference edge also passes through described
Five resistance are connected with the PFC voltage outputs sampling end.
2. PFC sample circuits as claimed in claim 1, it is characterised in that the switching tube is NPN triode；The switch
The control end of pipe is the base stage of the NPN triode, and the common port of the switching tube is the emitter stage of the NPN triode, institute
The output end for stating switching tube is the colelctor electrode of the NPN triode.
3. PFC sample circuits as claimed in claim 1 or 2, it is characterised in that the PFC sample circuits also include the 6th electricity
Resistance；
The ac voltage input is connected by the first resistor with the negative pole of the voltage-regulator diode：It is described to hand over
Stream voltage input end is connected with one end of the first resistor, and the other end of the first resistor passes through the 6th resistance and institute
State the negative pole connection of voltage-regulator diode.
4. PFC sample circuits as claimed in claim 1 or 2, it is characterised in that the PFC sample circuits also include the 7th electricity
Resistance；
The positive pole of the voltage-regulator diode is connected with the control end of the switching tube：The positive pole of the voltage-regulator diode leads to
The 7th resistance is crossed to be connected with the control end of the switching tube.
5. PFC sample circuits as claimed in claim 1 or 2, it is characterised in that the PFC sample circuits also include the 8th electricity
Resistance, the control end of the switching tube passes through the 8th resistance eutral grounding.
6. PFC sample circuits as claimed in claim 5, it is characterised in that the PFC sample circuits also include the first electric capacity,
First electric capacity and the 8th resistor coupled in parallel.
7. PFC sample circuits as claimed in claim 1 or 2, it is characterised in that the PFC sample circuits also include the second electricity
Hold, second electric capacity and the 4th resistor coupled in parallel.
8. PFC sample circuits as claimed in claim 1 or 2, it is characterised in that the 5th resistance is by least two resistance strings
Connection is constituted.
9. PFC sample circuits as claimed in claim 8, it is characterised in that the 5th resistance is by the 9th resistance, the tenth electricity
Resistance, the 11st resistance and the 12nd resistant series are constituted.
10. a kind of pfc circuit, it is characterised in that the pfc circuit has alternating current source and PFC voltage output ends；It is described
Pfc circuit includes IC circuits and the PFC sample circuits as described in claim any one of 1-9；
The ac voltage input is connected with the alternating current source, the PFC voltage outputs sampling end and the PFC voltages
Output end is connected；The IC voltage samples reference edge is connected with the voltage output end of the IC circuits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621408820.5U CN206323293U (en) | 2016-12-21 | 2016-12-21 | A kind of PFC sample circuits and pfc circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621408820.5U CN206323293U (en) | 2016-12-21 | 2016-12-21 | A kind of PFC sample circuits and pfc circuit |
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| CN206323293U true CN206323293U (en) | 2017-07-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696115A (en) * | 2018-07-31 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of zero phase start-up circuit |
-
2016
- 2016-12-21 CN CN201621408820.5U patent/CN206323293U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696115A (en) * | 2018-07-31 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of zero phase start-up circuit |
| CN108696115B (en) * | 2018-07-31 | 2024-02-13 | 广州金升阳科技有限公司 | Zero-phase starting circuit |
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