CN206894477U - Pfc sampling circuit and pfc circuit - Google Patents
Pfc sampling circuit and pfc circuit Download PDFInfo
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- CN206894477U CN206894477U CN201720154816.9U CN201720154816U CN206894477U CN 206894477 U CN206894477 U CN 206894477U CN 201720154816 U CN201720154816 U CN 201720154816U CN 206894477 U CN206894477 U CN 206894477U
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- pfc
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- oxide
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- 238000005070 sampling Methods 0.000 title abstract description 8
- 239000004065 semiconductor Substances 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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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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Abstract
The utility model relates to a PFC sampling circuit and PFC circuit, including locating resistance R1 between PFC sampling circuit's the sampling output and the first external power supply to and locate PFC sampling circuit's the sampling output and the resistance R2 between ground, still include: a switch control device and a switch device; the enabling control end of the switch device is connected with the switch control device, the first input/output end of the switch device is connected with a first external power supply through the resistor R1, and the second input/output end of the switch device is grounded through the resistor R2 and is connected with a control chip of the PFC circuit.
Description
Technical field
Field of circuit technology is the utility model is related to, more particularly to a kind of PFC sample circuits and pfc circuit.
Background technology
Computer power supply is responsible for the alternating current (AC) to change into direct current (DC) provides whole electric power, therefore its energy for main frame
Conversion efficiency height is a very important energy saving index.The energy conversion efficiency of power supply has no with nominal power size
Necessarily relation, it is power supply during processing AC to DC transformations, the remaining proportion of energy, and this efficiency is substantially dependent upon power supply
Internal Active PFC (PFC, Power Factor Correction) circuit.
The current power circuit with PFC is both needed to sample circuit.PFC sample circuits are typically made up of multiple resistant series, mesh
Power consumption is higher when preceding PFC sample circuits are standby.
Utility model content
Based on this, it is necessary to for existing PFC sample circuits stand-by power consumption it is higher the problem of, there is provided a kind of PFC sampling
Circuit and pfc circuit.
A kind of electricity between PFC sample circuits, including sampled output and the first external power supply located at PFC sample circuits
R1, and the resistance R2 between the sampled output and ground of PFC sample circuits are hindered, in addition to：
Switch controlling device and switching device；
The enabled control terminal of the switching device is connected with the switch controlling device, and the first of the switching device is defeated
Enter output end by the resistance R1 with the first external power supply to be connected, the second input/output terminal of the switching device passes through institute
Resistance R2 ground connection is stated, and is connected with the control chip of pfc circuit.
A kind of pfc circuit, including：
Control chip, the second metal-oxide-semiconductor, inductance, diode, resistance R5, electrochemical capacitor, and PFC sample circuits；
The output ends of the PFC sample circuits connects the feedback control end of the control chip, the control chip it is defeated
Go out the grid that end connects second metal-oxide-semiconductor, the source electrode of second metal-oxide-semiconductor is grounded by the resistance R5, the 2nd MOS
The drain electrode of pipe is connected by the external power supply of inductance connection second with the anode of the diode, the diode
Negative electrode is grounded by the electrochemical capacitor.
Above-mentioned PFC sample circuits and pfc circuit, add switching device between resistance R1 and resistance R2, and the PFC is adopted
When sample circuit works, the switch controlling device controlling switch device closes, first external power supply and the resistance R1, electricity
The loop conducting formed between resistance R2, switch controlling device and switching device；When the PFC sample circuits are in holding state,
The switch controlling device controlling switch device disconnects, and first external power supply controls with the resistance R1, resistance R2, switch
The loop formed between device and switching device disconnects, so as to effectively reduce the work(of PFC sample circuits in the standby state
Consumption.
Brief description of the drawings
Fig. 1 is the structural representation of PFC sample circuits of the present utility model；
Fig. 2 is the circuit diagram of PFC sample circuits of the present utility model；
Fig. 3 is the structural representation of pfc circuit of the present utility model.
Embodiment
The technical solution of the utility model is illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model provides a kind of PFC sample circuits, located at PFC sample circuits sampled output with
Resistance R1 between first external power supply, and the resistance R2 between the sampled output and ground of PFC sample circuits, are also wrapped
Include：
Switch controlling device and switching device；
The enabled control terminal of the switching device is connected with the switch controlling device, and the first of the switching device is defeated
Enter output end by the resistance R1 with the first external power supply to be connected, the second input/output terminal of the switching device passes through institute
Resistance R2 ground connection is stated, and is connected with the control chip of pfc circuit.
Resistance R1 resistance is preferably 1Mohm, and resistance R2 resistance is preferably 27Kohm.The switching device can be with
It is the device that triode, metal-oxide-semiconductor etc. have switching function, the switching device can be under the control of the switch controlling device
Disconnect or close.In this example, during the pfc circuit work, the switch controlling device controlling switch device closure is described
The loop formed between first external power supply and the resistance R1, resistance R2, switch controlling device and switching device turns on；It is described
When pfc circuit is in holding state, the switch controlling device controlling switch device disconnects, first external power supply with it is described
The loop formed between resistance R1, resistance R2, switch controlling device and switching device disconnects.So as to have in the standby state
Effect reduces the power consumption of PFC sample circuits.
When switching device is the first metal-oxide-semiconductor Q1, the grid of the first metal-oxide-semiconductor Q1 is connected with the switch controlling device
Connect, the source electrode of the first metal-oxide-semiconductor Q1 is grounded by resistance R2, the drain electrode of the first MOS pipes Q1 by resistance R1 with it is described
First external power supply HV is connected.
In one embodiment, the switch controlling device can be control power supply, when the PFC sample circuits work,
The control power supply output high level, so that the first metal-oxide-semiconductor Q1 is turned on；When the PFC sample circuits are in holding state, institute
Control power supply output low level is stated, so that the first metal-oxide-semiconductor Q1 ends, disconnects sampling circuit.
The circuit diagram of the PFC sample circuits of one embodiment is as shown in Figure 2.In figure, HV is the first external power supply, VCC-
PFC is switch controlling device, and SGND is ground.
In one embodiment, the PFC sample circuits may also include the enabled control terminal for being connected to the switching device
Resistance R3 between the switch controlling device.In one embodiment, the PFC sample circuits, which may also include, is connected to institute
State the resistance R4 between the enabled control terminal of switching device and ground.
As shown in figure 3, the utility model also provides a kind of pfc circuit, it may include：
Control chip, the second metal-oxide-semiconductor Q2, inductance L, diode D, resistance R5, electrochemical capacitor E, and PFC sample circuits；
The output ends of the PFC sample circuits connects the feedback control end of the control chip, the control chip it is defeated
Go out the grid that end connects second metal-oxide-semiconductor, the source electrode of second metal-oxide-semiconductor is grounded by the resistance R5, the 2nd MOS
The drain electrode of pipe is connected by the second external power supply of inductance connection Vb with the anode of the diode, the diode
Negative electrode be grounded by the electrochemical capacitor.
Above-mentioned PFC sample circuits and pfc circuit, add switching device between resistance R1 and resistance R2, and the PFC is adopted
When sample circuit works, the switch controlling device controlling switch device closes, first external power supply and the resistance R1, electricity
The loop conducting formed between resistance R2, switch controlling device and switching device；When the PFC sample circuits are in holding state,
The switch controlling device controlling switch device disconnects, and first external power supply controls with the resistance R1, resistance R2, switch
The loop formed between device and switching device disconnects, so as to effectively reduce the work(of PFC sample circuits in the standby state
Consumption.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (7)
1. a kind of PFC sample circuits, including the resistance between sampled output and the first external power supply located at PFC sample circuits
R1, and the resistance R2 between the sampled output and ground of PFC sample circuits, it is characterised in that also include：
Switch controlling device and switching device；
The enabled control terminal of the switching device is connected with the switch controlling device, and the first input of the switching device is defeated
Go out end by the resistance R1 with the first external power supply to be connected, the second input/output terminal of the switching device passes through the electricity
R2 ground connection is hindered, and is connected with the control chip of pfc circuit.
2. PFC sample circuits according to claim 1, it is characterised in that the switching device is the first metal-oxide-semiconductor；
The grid of first metal-oxide-semiconductor is connected with the switch controlling device, and the source electrode of first metal-oxide-semiconductor passes through resistance R2
Ground connection, the drain electrode of first metal-oxide-semiconductor are connected by resistance R1 with first external power supply.
3. PFC sample circuits according to claim 2, it is characterised in that the switch controlling device is control power supply；
During the PFC sample circuits work, the control power supply output high level；The PFC sample circuits are in holding state
When, the control power supply output low level.
4. the PFC sample circuits according to claims 1 to 3 any one, it is characterised in that the PFC sample circuits work
When making, switch controlling device controlling switch device closure, first external power supply and the resistance R1, resistance R2, open
Close the loop conducting formed between control device and switching device；When the PFC sample circuits are in holding state, the switch
Control device controlling switch device disconnects, and first external power supply and the resistance R1, resistance R2, switch controlling device and opens
The loop formed between device is closed to disconnect.
5. the PFC sample circuits according to claims 1 to 3 any one, it is characterised in that also include：
The resistance R3 being connected between the enabled control terminal of the switching device and the switch controlling device.
6. the PFC sample circuits according to claims 1 to 3 any one, it is characterised in that also include：
The resistance R4 being connected between the enabled control terminal of the switching device and ground.
A kind of 7. pfc circuit, it is characterised in that including：
Control chip, the second metal-oxide-semiconductor, inductance, diode, resistance R5, electrochemical capacitor, and such as claim 1 to 6 any one
Described PFC sample circuits；
The output end of the PFC sample circuits connects the feedback control end of the control chip, the output end of the control chip
The grid of second metal-oxide-semiconductor is connected, the source electrode of second metal-oxide-semiconductor is grounded by the resistance R5, second metal-oxide-semiconductor
Drain electrode is connected by the external power supply of inductance connection second with the anode of the diode, the negative electrode of the diode
It is grounded by the electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720154816.9U CN206894477U (en) | 2017-02-20 | 2017-02-20 | Pfc sampling circuit and pfc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720154816.9U CN206894477U (en) | 2017-02-20 | 2017-02-20 | Pfc sampling circuit and pfc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206894477U true CN206894477U (en) | 2018-01-16 |
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ID=61328358
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720154816.9U Active CN206894477U (en) | 2017-02-20 | 2017-02-20 | Pfc sampling circuit and pfc circuit |
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| CN (1) | CN206894477U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727564A (en) * | 2019-03-07 | 2019-05-07 | 青岛海信电器股份有限公司 | Display device and Zenith tracking method |
-
2017
- 2017-02-20 CN CN201720154816.9U patent/CN206894477U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727564A (en) * | 2019-03-07 | 2019-05-07 | 青岛海信电器股份有限公司 | Display device and Zenith tracking method |
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