CN207992308U - The voltage detecting circuit and power supply of pfc circuit module - Google Patents
The voltage detecting circuit and power supply of pfc circuit module Download PDFInfo
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- CN207992308U CN207992308U CN201820435881.3U CN201820435881U CN207992308U CN 207992308 U CN207992308 U CN 207992308U CN 201820435881 U CN201820435881 U CN 201820435881U CN 207992308 U CN207992308 U CN 207992308U
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- pfc
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- voltage
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- circuit module
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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 discloses a kind of voltage detecting circuit and power supply of pfc circuit module, the voltage detecting circuit of the pfc circuit module includes coupling block isolating circuit unit, voltage sampling circuit unit and PFC chips；The voltage detecting circuit that coupling block isolating circuit unit controls pfc circuit module when pfc circuit module does not work stops voltage detecting work so that the power consumption of the voltage detecting circuit of pfc circuit module is zero；Voltage sampling circuit unit samples the drain voltage of MOS switch pipe in the shutdown moment of pfc circuit mould MOS switch pipe in the block；PFC chips are executed when sampled voltage is more than predetermined voltage threshold acts the overvoltage protection of pfc circuit module；The drain electrode of the input terminal and MOS switch pipe that couple block isolating circuit unit connects, and output end is connect with the input terminal of voltage sampling circuit unit；The output end of voltage sampling circuit unit is connect with PFC chips.The utility model can reduce circuit power consumption.
Description
Technical field
The utility model is related to field of power supplies more particularly to a kind of voltage detecting circuits and power supply of pfc circuit module.
Background technology
PFC (PFC, Power Factor Correction, Active PFC) technology in large power supply it is non-usually
See, function is to increase the power consumption efficiency of electrical equipment.Currently, the voltage detection scheme of general pfc circuit module all makes
Partial pressure sampling is carried out with the voltage on voltage sampling resistor output electrolytic capacitor (CE1) in the block to pfc circuit mould to realize pair
The output over-voltage protection function of pfc circuit module, still, the voltage detection scheme is when standby since voltage sample resistance can produce
Raw power attenuation is to generate certain stand-by power consumption.
Utility model content
The main purpose of the utility model is to provide a kind of voltage detecting circuits of pfc circuit module, it is intended to reduce electricity
Road power consumption.
To achieve the goals above, the utility model provides a kind of voltage detecting circuit of pfc circuit module, the PFC
The voltage detecting circuit of circuit module includes coupling block isolating circuit unit, voltage sampling circuit unit and PFC chips；Wherein：
The coupling block isolating circuit unit, the electricity for controlling the pfc circuit module when pfc circuit module does not work
Detection circuit is pressed to stop voltage detecting work, so that the power consumption of the voltage detecting circuit of the pfc circuit module is zero；
The voltage sampling circuit unit is used for the shutdown moment in the pfc circuit mould MOS switch pipe in the block to institute
The drain voltage for stating MOS switch pipe is sampled；
The PFC chips, the voltage for being sampled when the voltage sampling circuit unit are more than predetermined voltage threshold
Shi Zhihang acts the overvoltage protection of the pfc circuit module；
The input terminal of the coupling block isolating circuit unit is connect with the drain electrode of the pfc circuit mould MOS switch pipe in the block,
The output end of the coupling block isolating circuit unit is connect with the input terminal of the voltage sampling circuit unit, the voltage sample electricity
The output end of road unit is connect with the PFC chips.
Preferably, the voltage detecting circuit of the pfc circuit module further includes clamp circuit unit, the clamp circuit list
Voltage of the member for the output end to the coupling block isolating circuit unit carries out clamper, so that the voltage sampling circuit unit institute
The voltage sampled is more stablized；The clamp circuit unit is connect with the output end of the coupling block isolating circuit unit.
Preferably, the coupling block isolating circuit unit includes the first capacitance, and the first end of first capacitance is the coupling
The input terminal of block isolating circuit unit is closed, the first end of first capacitance is connect with the drain electrode of the MOS switch pipe, and described first
The second end of capacitance is the output end of the coupling block isolating circuit unit, the second end of first capacitance respectively with the clamper
The input terminal of circuit unit and the voltage sampling circuit unit connects.
Preferably, the voltage sampling circuit unit includes first resistor and second resistance, and the first of the first resistor
End is the input terminal of the voltage sampling circuit unit, and the first end of the first resistor and the second end of first capacitance connect
It connects, the second end of the first resistor is connect with the first end of the second resistance, the second end ground connection of the second resistance, institute
The link node for stating first resistor and the second resistance is the output end of the voltage sampling circuit unit, the first resistor
It is connect with the link node of the second resistance with the overvoltage protection of PFC chips control input pin.
Preferably, the clamp circuit unit includes the first diode, and the cathode of first diode is coupled with described
The output end of block isolating circuit unit connects, the plus earth of first diode.
Preferably, first capacitance is high voltage bearing ceramic condenser.
Preferably, the pfc circuit mould MOS switch pipe in the block is NMOS switch pipe.
In addition, to achieve the above object, the utility model also provides a kind of power supply, the power supply includes pfc circuit module,
The pfc circuit module includes the voltage detecting circuit of pfc circuit module as described above.
The utility model provides a kind of voltage detecting circuit of pfc circuit module, the voltage detecting electricity of the pfc circuit module
Road includes coupling block isolating circuit unit, voltage sampling circuit unit and PFC chips；The coupling block isolating circuit unit,
Voltage detecting circuit for controlling the pfc circuit module when pfc circuit module does not work stops voltage detecting work, with
It is zero to make the power consumption of the voltage detecting circuit of the pfc circuit module；The voltage sampling circuit unit, in the PFC
The shutdown moment of MOS switch pipe in circuit module samples the drain voltage of the MOS switch pipe；The PFC chips,
Voltage for being sampled when the voltage sampling circuit unit executes when being more than predetermined voltage threshold to the pfc circuit mould
The overvoltage protection of block acts；The input terminal of the coupling block isolating circuit unit and the pfc circuit mould MOS switch pipe in the block
The output end of drain electrode connection, the coupling block isolating circuit unit is connect with the input terminal of the voltage sampling circuit unit, described
The output end of voltage sampling circuit unit is connect with the PFC chips.The voltage detecting circuit of the utility model pfc circuit module
Stop voltage detecting work since the coupling block isolating circuit unit can control the utility model when pfc circuit module does not work
Make, so that power consumption of the voltage detecting circuit of the utility model pfc circuit module when the pfc circuit module does not work
It is zero, and then significantly reduces circuit power consumption；Also, the utility model also has the advantages that simple in structure and easy realization.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of one embodiment of voltage detecting circuit of the utility model pfc circuit module.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific implementation mode
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, without
It can be interpreted as indicating or implying its relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result,
The feature of " first ", " second " can explicitly or implicitly include at least one of the features.In addition, between each embodiment
Technical solution can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, work as technical solution
Combination there is conflicting or cannot achieve when and will be understood that the combination of this technical solution is not present, it is also not new in this practicality
Within the protection domain that type requires.
The utility model provides a kind of voltage detecting circuit 100 of pfc circuit module, referring to Fig.1, should in the present embodiment
The voltage detecting circuit 100 of pfc circuit module include coupling block isolating circuit unit 101, voltage sampling circuit unit 102 and
PFC chips 103；
The coupling block isolating circuit unit 101, for controlling the present embodiment pfc circuit when pfc circuit module does not work
The voltage detecting circuit of module stops voltage detecting work, so that the work(of the voltage detecting circuit of the present embodiment pfc circuit module
Consumption is zero；
The voltage sampling circuit unit 102, for the shutdown wink in pfc circuit mould MOS switch pipe Q1 in the block
Between the drain voltage of the MOS switch pipe Q1 is sampled；
The PFC chips 103, the MOS switch pipe Q1 for being sampled when the voltage sampling circuit unit 102
Drain voltage execute when being more than predetermined voltage threshold the overvoltage protection of the pfc circuit module acted；
Further, the voltage detecting circuit 100 of the present embodiment pfc circuit module further includes clamp circuit unit 104, institute
The voltage that clamp circuit unit 104 is stated for the output end to the coupling block isolating circuit unit 101 carries out clamper, so that described
The voltage that voltage sampling circuit unit 102 is sampled more is stablized.
In the present embodiment, the input terminal of the coupling block isolating circuit unit 101 is opened with the pfc circuit mould MOS in the block
The drain electrode connection of pipe Q1 is closed, the output end for coupling block isolating circuit unit 101 is defeated with the voltage sampling circuit unit 102
Enter end connection, the output end of the voltage sampling circuit unit 102 is connect with the PFC chips 103, the clamp circuit unit
104 connect with the output end of the coupling block isolating circuit unit 101.
Specifically, in the present embodiment, the coupling block isolating circuit unit 101 includes the first capacitance C1, first capacitance
The first end of C1 is the input terminal of the coupling block isolating circuit unit 101, and the first end of the first capacitance C1 is opened with the MOS
The drain D connection of pipe Q1 is closed, the second end of the first capacitance C1 is the output end of the coupling block isolating circuit unit 101, institute
State the second end input with the clamp circuit unit 104 and the voltage sampling circuit unit 102 respectively of the first capacitance C1
End connection.It should be noted that in the present embodiment, the first capacitance C1 is high voltage bearing ceramic condenser.
In the present embodiment, the voltage sampling circuit unit 102 includes first resistor R1 and second resistance R2, and described first
The first end of resistance R1 be the voltage sampling circuit unit 102 input terminal, the first end of the first resistor R1 with it is described
Couple the second end connection of the first capacitance C1 described in block isolating circuit unit 101, the second end of the first resistor R1 with it is described
The first end of second resistance R2 connects, the second end ground connection of the second resistance R2, the first resistor R1 and second electricity
The link node for hindering R2 is the output end of the voltage sampling circuit unit 102, the first resistor R1 and the second resistance
The link node of R2 is connect with the overvoltage protection of the PFC chips 103 control input pin OVP.
In the present embodiment, the clamp circuit unit 104 includes the first diode D1, the cathode of the first diode D1
It is connect with the output end of the coupling block isolating circuit unit 101, the plus earth of the first diode D1.
In the present embodiment, the pfc circuit module includes ac power input end 201, rectifier bridge stack 202, the second capacitance
C2, inductance LP1, the second diode D2, output electrolytic capacitor CE1, resistance RS and the MOS switch pipe Q1.Specifically, described whole
Two ac input ends of stream bridge heap 202 are connect with the ac power input end 201, and the direct current of the rectifier bridge stack 202 is defeated
The positive "+" of outlet is connect with the first end of the inductance LP1, and the cathode "-" of the DC output end of the rectifier bridge stack 202 connects
The first end on ground, the second capacitance C2 is connect with the positive "+" of the DC output end of the rectifier bridge stack 202, and described second
The second end of capacitance C2 is grounded, the second end of the inductance LP1 respectively with the drain electrode of the MOS switch pipe Q1 and the described 2nd 2
The anode of pole pipe D2 connects, and the cathode of the second diode D2 is connect with the anode of the output electrolytic capacitor CE1, described defeated
Go out the cathode ground connection of electrolytic capacitor CE1, the source electrode of the MOS switch pipe is grounded through the resistance RS, the MOS switch pipe Q1's
Grid connect that (switch motion of the MOS switch pipe Q1 is by the PFC with the control signal output pin DR of the PFC chips 103
The control signal of the control signal output pin DR outputs of chip 103 is controlled).In the present embodiment, the pfc circuit mould is in the block
The MOS switch pipe Q1 is NMOS switch pipe.
The operation principle of the voltage detecting circuit of the present embodiment pfc circuit module is described in detail below：When the pfc circuit
When the mould MOS switch pipe Q1 in the block is connected, electric current flows through the second capacitance C2, the inductance LP1, the MOS switch
The pipe Q1 and resistance RS；When the MOS switch pipe Q1 is turned off, electric current flow through the second capacitance C2, the inductance LP1,
The second diode D2 and output electrolytic capacitor CE1.In the shutdown moment of the MOS switch pipe Q1, the MOS switch
The drain voltage Vds of pipe Q1 is equal to the direct current that voltage Vce1 on the output electrolytic capacitor CE1 subtracts the second diode D2
Pressure drop Vdf, i.e. Vds=Vce1-Vdf, since the direct current pressure drop Vdf of the second diode D2 is very small, Vdf is negligible
Disregard, i.e., has Vds ≈ Vce1, the voltage detecting electricity of the present embodiment pfc circuit module in the shutdown moment of the MOS switch pipe Q1
Road voltage Vce1 on shutdown moment its drain voltage Vds and the output electrolytic capacitor CE1 using the MOS switch pipe Q1
(namely output voltage of the pfc circuit module) equal relationship, by detect the drain voltage of the MOS switch pipe Q1 come
It realizes the purpose for the output voltage for detecting the pfc circuit module, and then realizes the overvoltage protection work(to the pfc circuit module
Energy.Specifically, the voltage sampling circuit unit 102 in the shutdown moment of the MOS switch pipe Q1 to the MOS switch pipe Q1
Drain voltage sampled, and by the overvoltage protection of the voltage output sampled to the PFC chips 103 control input pin
OVP, in the present embodiment, voltage Vovp=R2/ (R1+R2) * Vds that the voltage sampling circuit unit 102 is sampled, wherein
Vds is the drain voltage Vds of the MOS switch pipe Q1, in the present embodiment, when the voltage sampling circuit unit 102 is sampled
When the voltage Vovp arrived is more than predetermined voltage threshold, the PFC chips 103 execute the overvoltage protection to the pfc circuit module
Action, is damaged so as to avoid the pfc circuit module because of overvoltage.It is understood that in the present embodiment, above-mentioned default electricity
Pressure threshold value can be set according to actual conditions.In the present embodiment, described in the coupling block isolating circuit unit 101
First capacitance C1 only couples the drain voltage Vds of the MOS switch pipe Q1 to institute in the shutdown moment of the MOS switch pipe Q1
It states in voltage sampling circuit unit 102 to be sampled to it, and (the corresponding MOS when the pfc circuit module does not work
When switching tube Q1 is constantly in off state namely when standby mode), due to the presence of the first capacitance C1, circuit
In direct current signal will not be coupled in the voltage sampling circuit unit 102, i.e., in the coupling block isolating circuit unit 101
The first capacitance C1 can control the voltage detecting circuit of the present embodiment pfc circuit module when pfc circuit module does not work
100 stop voltage detecting work, so that the voltage detecting circuit 100 of the present embodiment pfc circuit module is in the pfc circuit
Power consumption when module does not work is zero.
The voltage detecting circuit 100 of the present embodiment pfc circuit module can be due to the coupling block isolating circuit unit 101
Pfc circuit module can control the present embodiment pfc circuit module voltage detecting circuit 100 when not working stops voltage detecting work
Make, so that work(of the voltage detecting circuit 100 of the present embodiment pfc circuit module when the pfc circuit module does not work
Consumption is zero, and then significantly reduces circuit power consumption；Also, the voltage detecting circuit 100 of the present embodiment pfc circuit module also has
There is the advantages of simple in structure and easy realization.
The utility model also provides a kind of power supply, which includes pfc circuit module, and the pfc circuit module includes PFC
The structure of the voltage detecting circuit of circuit module, the voltage detecting circuit of the pfc circuit module can refer to above-described embodiment, herein
It repeats no more.Naturally, since the power supply of the present embodiment uses the skill of the voltage detecting circuit of above-mentioned pfc circuit module
Art scheme, therefore the advantageous effect that the power supply has the voltage detecting circuit of above-mentioned pfc circuit module all.
It these are only the preferred embodiment of the utility model, it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are equally included in the patent within the scope of the utility model.
Claims (8)
1. a kind of voltage detecting circuit of pfc circuit module, which is characterized in that the voltage detecting circuit of the pfc circuit module
Including coupling block isolating circuit unit, voltage sampling circuit unit and PFC chips；Wherein：
The coupling block isolating circuit unit, the voltage for controlling the pfc circuit module when pfc circuit module does not work are examined
Slowdown monitoring circuit stops voltage detecting work, so that the power consumption of the voltage detecting circuit of the pfc circuit module is zero；
The voltage sampling circuit unit is used for the shutdown moment in the pfc circuit mould MOS switch pipe in the block to described
The drain voltage of MOS switch pipe is sampled；
The PFC chips, the voltage for being sampled when the voltage sampling circuit unit are held when being more than predetermined voltage threshold
Row acts the overvoltage protection of the pfc circuit module；
The input terminal of the coupling block isolating circuit unit is connect with the drain electrode of the pfc circuit mould MOS switch pipe in the block, described
The output end of coupling block isolating circuit unit is connect with the input terminal of the voltage sampling circuit unit, the voltage sampling circuit list
The output end of member is connect with the PFC chips.
2. the voltage detecting circuit of pfc circuit module as described in claim 1, which is characterized in that the pfc circuit module
Voltage detecting circuit further includes clamp circuit unit, and the clamp circuit unit is used for the defeated of the coupling block isolating circuit unit
The voltage of outlet carries out clamper, so that the voltage that the voltage sampling circuit unit is sampled more is stablized；The clamper electricity
Road unit is connect with the output end of the coupling block isolating circuit unit.
3. the voltage detecting circuit of pfc circuit module as claimed in claim 2, which is characterized in that the coupling block isolating circuit
Unit includes the first capacitance, and the first end of first capacitance is the input terminal of the coupling block isolating circuit unit, and described first
The first end of capacitance is connect with the drain electrode of the MOS switch pipe, and the second end of first capacitance is the coupling block isolating circuit
The output end of unit, the second end of first capacitance respectively with the clamp circuit unit and the voltage sampling circuit unit
Input terminal connection.
4. the voltage detecting circuit of pfc circuit module as claimed in claim 3, which is characterized in that the voltage sampling circuit
Unit includes first resistor and second resistance, and the first end of the first resistor is the input of the voltage sampling circuit unit
End, the first end of the first resistor connect with the second end of first capacitance, the second end of the first resistor with it is described
The first end of second resistance connects, the second end ground connection of the second resistance, the company of the first resistor and the second resistance
Binding place is the output end of the voltage sampling circuit unit, the link node and institute of the first resistor and the second resistance
State the overvoltage protection control input pin connection of PFC chips.
5. the voltage detecting circuit of pfc circuit module as claimed in claim 4, which is characterized in that the clamp circuit unit
Including the first diode, the cathode of first diode is connect with the output end of the coupling block isolating circuit unit, and described the
The plus earth of one diode.
6. the voltage detecting circuit of pfc circuit module as claimed in claim 3, which is characterized in that first capacitance is resistance to
The ceramic condenser of high pressure.
7. such as the voltage detecting circuit of pfc circuit module according to any one of claims 1 to 6, which is characterized in that described
The pfc circuit mould MOS switch pipe in the block is NMOS switch pipe.
8. a kind of power supply, which is characterized in that the power supply includes pfc circuit module, and the pfc circuit module includes claim
The voltage detecting circuit of pfc circuit module described in any one of 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820435881.3U CN207992308U (en) | 2018-03-29 | 2018-03-29 | The voltage detecting circuit and power supply of pfc circuit module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820435881.3U CN207992308U (en) | 2018-03-29 | 2018-03-29 | The voltage detecting circuit and power supply of pfc circuit module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207992308U true CN207992308U (en) | 2018-10-19 |
Family
ID=63829527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820435881.3U Active CN207992308U (en) | 2018-03-29 | 2018-03-29 | The voltage detecting circuit and power supply of pfc circuit module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207992308U (en) |
-
2018
- 2018-03-29 CN CN201820435881.3U patent/CN207992308U/en active Active
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