CN103746574A - Line voltage compensation circuit - Google Patents
Line voltage compensation circuit Download PDFInfo
- Publication number
- CN103746574A CN103746574A CN201410005766.9A CN201410005766A CN103746574A CN 103746574 A CN103746574 A CN 103746574A CN 201410005766 A CN201410005766 A CN 201410005766A CN 103746574 A CN103746574 A CN 103746574A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- current
- compensation circuit
- resistor
- 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.)
- Pending
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses a line voltage compensation circuit, which consists of a grid control signal, a voltage feedback signal, a current sampling signal, a clamping circuit, a mirror image circuit, a compensation circuit, a first resistor R1, a second resistor R2 and a first switch tube K1, wherein the first resistor R1 is connected with the voltage feedback signal and the clamping circuit, the second resistor R2 is connected with the voltage feedback signal and the first switch tube K1, the mirror image circuit is connected with the clamping circuit and the compensation circuit, the compensation circuit is connected with the current sampling signal and the mirror image circuit, the grid control signal controls the first switch tube, the first switch tube K1 is connected with the ground and the second resistor R2, the resistance value of the first resistor R1 I greater than that of the second resistor R2, the clamping circuit is used for clamping the level at the connecting part of the clamping circuit and the first resistor R1 into the ground level when the first switch tube K1 is conducted, the mirror image circuit is used for outputting current mirror images on the second resistor R2 to the compensation circuit, and the compensation circuit is used for outputting the compensation current. The line voltage compensation circuit has the advantages that the structure is simple, the power consumption is low, the constant current precision is high, and the like.
Description
Technical field
The invention belongs to semiconductor circuit technical field, be specifically related to a kind of voltage compensation circuit of switch power line.
Background technology
The Switching Power Supply that is applied to LED driving and charger extensively adopts peak current control mode to realize constant current output.But because peak current control has the impact of time delay, under not collinear voltage, output current value is not identical, thereby constant current accuracy is poor.
Line voltage compensation circuit can obtain corresponding offset current by the line voltage of sampling different and realize constant current.
With reference to Fig. 1, it is the switching power circuit structure chart with line voltage compensation circuit.Switching Power Supply comprises on-off controller 110, transformer 111, power tube Q1, the first divider resistance R1, the second divider resistance R2, current sampling resistor R3, secondary rectifying tube D1, output capacitance C1, output resistance R5.
Wherein, described on-off controller 110 comprises: line voltage compensation circuit 106, overcurrent comparator 107, ON-OFF control circuit 108, drive circuit 109, compensating resistance R4.Line voltage compensation circuit 106 comprises: sample rate current circuit 104, current mirroring circuit 105.Transformer 111 comprises: former limit winding 101, secondary winding 102, auxiliary winding 103.In Fig. 1, the stain on each winding identifies the Same Name of Ends of each winding.
In Fig. 1, when power tube Q1 conducting, former limit winding 101 voltages equal Vin.By transformer coupled effect, auxiliary equal-Vin of winding 103 voltages × (Np/Na).Line voltage compensation circuit 106 is forced voltage feedback signal FB voltage clamping to 0V, and the electric current that flows through so the first divider resistance R1 is (Vin × (Np/Na))/R1.Sample rate current circuit 104 samples the electric current of R1, by current mirroring circuit 105, is transferred to compensating resistance R4, produces bucking voltage Vr4.Bucking voltage adds that the current sample voltage Vcs of current sampling resistor R3 equals Vcs1.When Vcs1 equals Vref, overcurrent comparator 107 output overcurrent signals, close by ON-OFF control circuit 108 and drive circuit 109 power ratio control pipe Q1.Because ON-OFF control circuit 108 and drive circuit 109 have time delay, higher line voltages is relatively larger by the electric current of current sampling resistor R4, and lower line voltage source overcurrent is less.
Bucking voltage Vr4 also can change according to the size variation of line voltage thereupon.Under higher line voltages, bucking voltage can be higher; Under lower line voltage, bucking voltage can be lower.After compensating action by bucking voltage Vr4, the electric current of current flowing sampling resistor is tending towards constant.
Fig. 2 is a kind of traditional line voltage compensation circuit 202.As shown in Figure 2, PMOS pipe MP1, MP2, NMOS pipe MN1, MN2 composition sample rate current circuit 204.PMOS pipe MP3 is current mirroring circuit 203.Resistance R 4 is compensating resistance.
When auxiliary winding 201 voltages be-during Vin × (Np/Na), the source class voltage of MN2 can be voltage feedback signal FB voltage clamping to 0V left and right.The electric current that flows through MP2 is (Vin × (Np/Na))/R1.MP2 is 30:1 with the number in parallel of MP3, and the electric current that flows through so MP3 is (Vin × (Np/Na))/(30 × R1).This electric current flows through compensating resistance R4 and realizes compensation.The electric current that MP2 need to flow through is larger, more obvious on the power consumption impact of chip.
Visible, the line voltage compensation circuit working electric current of traditional approach is larger, and power consumption is higher.
Summary of the invention
The object of the invention is to provide for the defect of prior art the line voltage compensation circuit that a kind of circuit power consumption is lower.
The present invention for achieving the above object, adopts following technical scheme:
A line voltage compensation circuit as shown in Figure 3, consists of grid control signal, voltage feedback signal, current sampling signal, clamp circuit, mirror image circuit, compensating circuit, the first resistance, the second resistance and the first switching tube.The first resistance connects voltage feedback signal and clamp circuit, the second resistance connects voltage feedback signal and the first switching tube, mirror image circuit connects clamp circuit and compensating circuit, and compensating circuit connects current sampling signal and mirror image circuit, grid-control signal controlling the first switching tube processed.
Further, the first switching tube can be substituted by NMOS pipe, but is not limited to NMOS pipe.
Further, when the first switching tube conducting, clamp circuit is earth potential by itself and the first resistance joint current potential clamper.Voltage feedback signal is negative voltage, and now electric current flows to voltage feedback signal from the first resistance and the second resistance.The electric current and the resistance value that flow through the first resistance and the second resistance are inversely proportional to.The second resistance is less, and most of electric current flows through the second resistance, and the electric current that flows through the second resistance flows to earth potential by the first switching tube, thereby realizes low-power consumption feature.
Compared with prior art, voltage compensation circuit of switch power line provided by the invention has simple in structure, low in energy consumption, constant current accuracy advantages of higher.
Accompanying drawing explanation
Fig. 1 is the switching power circuit structure chart with line voltage compensation circuit.
Fig. 2 is conventional art neutral voltage compensating circuit figure.
Fig. 3 is circuit structure block diagram of the present invention.
Fig. 4 is the line voltage compensation circuit diagram of first embodiment of the invention.
Fig. 5 is the line voltage compensation circuit diagram of second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention be have been described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.
Figure 4 shows that the first embodiment according to line voltage compensation circuit of the present invention.In this embodiment, described line voltage compensation circuit is comprised of two-way current mirror, sampling resistor, compensating resistance R4, switching device.
Wherein, a road current mirror comprises, PMOS pipe MP1, MP2 and MP3.Another road current mirror comprises, NMOS manages MN1, MN2.Sampling resistor comprises, resistance R 3 and R5, and switching device is NMOS pipe MN3.
The course of work of the line voltage compensation circuit shown in Fig. 4 is:
When grid control signal is while being low, ancillary coil La can produce positive voltage, and voltage feedback signal voltage is positive voltage, and line voltage compensation circuit is not worked.
When grid control signal is while being high, ancillary coil La can produce negative voltage, and voltage feedback signal voltage can be 0V left and right by clamper, and the resistance R 1 that connects so voltage feedback signal and ancillary coil La has electric current to flow through.The size of current that R1 flows through is Vla/R1.
The electric current that flows through resistance R 1 also can flow through resistance R 3 and R5.When resistance R 3 is 29: 1 with the resistance value ratio of R5, the electric current that flows through so R3 is Vla/30 × R1, all the other current direction earth potentials.The operating current of power end will reduce so, thereby realizes the effect of low-power consumption.
The electric current of PMOS pipe MP2 is also all Vla/30 × R1.PMOS pipe MP2 is 30:15 with the pipe number ratio of PMOS pipe MP3.By current mirror, the electric current of PMOS pipe MP3 is Vla/60 × R1.This electric current flows through compensating resistance R4 and produces bucking voltage Vcs1=(Vla/60 × R1) × R4, finally realizes line voltage compensation function.
Figure 5 shows that the second embodiment according to line voltage compensation circuit of the present invention.In this embodiment, described line voltage compensation circuit is comprised of two-way current mirror, sampling resistor, compensating resistance R4, switching device.
Wherein, a road current mirror comprises, PNP pipe MP1, MP2 and MP3.Another road current mirror comprises, NPN manages MN1, MN2.Sampling resistor comprises, resistance R 3 and R5, and switching device is NMOS pipe MN3.
The course of work of the line voltage compensation circuit shown in Fig. 5 is:
When grid control signal is while being low, ancillary coil La can produce positive voltage, and voltage feedback signal voltage is positive voltage, and line voltage compensation circuit is not worked.
When grid control signal is while being high, ancillary coil La can produce negative voltage, and voltage feedback signal voltage can be 0V left and right by clamper, and the resistance R 1 that connects so voltage feedback signal and ancillary coil La has electric current to flow through.The size of current that R1 flows through is Vla/R1.
The electric current that flows through resistance R 1 also can flow through resistance R 3 and R5.When resistance R 3 is 29: 1 with the resistance value ratio of R5, the electric current that flows through so R3 is Vla/30 × R1, all the other current direction earth potentials.The operating current of power end will reduce so, thereby realizes the effect of low-power consumption.
The electric current of PNP pipe MP2 is also all Vla/30 × R1.PNP pipe MP2 is 30:15 with the pipe number ratio of PNP pipe MP3.By current mirror, the electric current of PNP pipe MP3 is Vla/60 × R1.This electric current flows through compensating resistance R4 and produces bucking voltage Vcs1=(Vla/60 × R1) × R4, finally realizes line voltage compensation function.
Claims (2)
1. a line voltage compensation circuit, is characterized in that: this circuit consists of grid control signal, voltage feedback signal, current sampling signal, clamp circuit, mirror image circuit, compensating circuit, the first resistance R 1, the second resistance R 2 and the first switching tube K1;
The first resistance R 1 connects voltage feedback signal and clamp circuit, connect voltage feedback signal and the first switching tube K1, mirror image circuit connects clamp circuit and compensating circuit, compensating circuit connects current sampling signal and mirror image circuit, grid-control signal controlling the first switching tube processed, the first switching tube K1 connects ground and the second resistance R 2;
The first resistance R 1 resistance is greater than the second resistance R 2; Described clamp circuit is for when the first switching tube K1 conducting, and clamp circuit is earth potential by itself and the first resistance R 1 junction current potential clamper; Described mirror image circuit is for exporting to compensating circuit by the current mirror in the second resistance R 2; Described compensating circuit is used for exporting offset current.
2. line voltage compensation circuit according to claim 1, is characterized in that: described the first switching tube K1 is NMOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410005766.9A CN103746574A (en) | 2014-01-07 | 2014-01-07 | Line voltage compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410005766.9A CN103746574A (en) | 2014-01-07 | 2014-01-07 | Line voltage compensation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103746574A true CN103746574A (en) | 2014-04-23 |
Family
ID=50503577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410005766.9A Pending CN103746574A (en) | 2014-01-07 | 2014-01-07 | Line voltage compensation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103746574A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065273A (en) * | 2014-07-09 | 2014-09-24 | 深圳市科创达微电子有限公司 | Line voltage compensation circuit for constant current LED driving |
| CN106507541A (en) * | 2016-12-06 | 2017-03-15 | 上海晶丰明源半导体有限公司 | A kind of LED linear driver, drive circuit, chip and driving method |
| CN106793277A (en) * | 2016-12-12 | 2017-05-31 | 昂宝电子（上海）有限公司 | For the line voltage compensation system of LED constant current control |
| CN107171580A (en) * | 2017-07-10 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit for AC DC converters |
| CN107302214A (en) * | 2017-08-10 | 2017-10-27 | 广州金升阳科技有限公司 | A kind of input undervoltage protection circuit |
| CN107544604A (en) * | 2017-10-15 | 2018-01-05 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit under constant current mode |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024898A1 (en) * | 2003-07-28 | 2005-02-03 | Ta-Yung Yang | Primary-side controlled flyback power converter |
| CN202009331U (en) * | 2011-05-05 | 2011-10-12 | 上海新进半导体制造有限公司 | Circuit for controlling constant current output in switch power source |
| CN103401424A (en) * | 2013-07-19 | 2013-11-20 | 昂宝电子（上海）有限公司 | System and method for regulating output current of power supply transformation system |
| CN103427650A (en) * | 2013-07-16 | 2013-12-04 | 广州金升阳科技有限公司 | Input voltage sampling compensating circuit |
-
2014
- 2014-01-07 CN CN201410005766.9A patent/CN103746574A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024898A1 (en) * | 2003-07-28 | 2005-02-03 | Ta-Yung Yang | Primary-side controlled flyback power converter |
| CN202009331U (en) * | 2011-05-05 | 2011-10-12 | 上海新进半导体制造有限公司 | Circuit for controlling constant current output in switch power source |
| CN103427650A (en) * | 2013-07-16 | 2013-12-04 | 广州金升阳科技有限公司 | Input voltage sampling compensating circuit |
| CN103401424A (en) * | 2013-07-19 | 2013-11-20 | 昂宝电子（上海）有限公司 | System and method for regulating output current of power supply transformation system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065273A (en) * | 2014-07-09 | 2014-09-24 | 深圳市科创达微电子有限公司 | Line voltage compensation circuit for constant current LED driving |
| CN104065273B (en) * | 2014-07-09 | 2017-06-30 | 深圳市芯华国创半导体股份有限公司 | A kind of line voltage compensation circuit driven for constant-current LED |
| CN106507541A (en) * | 2016-12-06 | 2017-03-15 | 上海晶丰明源半导体有限公司 | A kind of LED linear driver, drive circuit, chip and driving method |
| CN106507541B (en) * | 2016-12-06 | 2019-03-12 | 上海晶丰明源半导体股份有限公司 | A kind of LED linear driver, driving circuit, chip and driving method |
| CN106793277A (en) * | 2016-12-12 | 2017-05-31 | 昂宝电子（上海）有限公司 | For the line voltage compensation system of LED constant current control |
| CN107171580A (en) * | 2017-07-10 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit for AC DC converters |
| CN107171580B (en) * | 2017-07-10 | 2019-08-09 | 中腾微网（北京）科技有限公司 | A kind of gauze compensation circuit for AC-DC converter |
| CN107302214A (en) * | 2017-08-10 | 2017-10-27 | 广州金升阳科技有限公司 | A kind of input undervoltage protection circuit |
| WO2019029221A1 (en) * | 2017-08-10 | 2019-02-14 | 广州金升阳科技有限公司 | Input under-voltage protection circuit |
| CN107544604A (en) * | 2017-10-15 | 2018-01-05 | 长沙方星腾电子科技有限公司 | A kind of gauze compensation circuit under constant current mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103746574A (en) | Line voltage compensation circuit | |
| CN103219893B (en) | Switch power controller and switching power circuit | |
| CN101867365A (en) | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation | |
| CN105099203A (en) | Voltage sampling control circuit, voltage sampling control method and isolated converter | |
| CN104699153A (en) | Low-dropout linear regulator | |
| CN104812121B (en) | Led drive circuit | |
| CN103079322B (en) | Closed loop light-emitting diode (LED) current control circuit and power-switching circuit | |
| CN104507227B (en) | Transformerless constant-current power supply circuit | |
| CN108536206A (en) | A kind of voltage regulator and voltage adjusting method | |
| CN103440009B (en) | Start circuit and voltage stabilizing circuit with start circuit | |
| CN204156724U (en) | A kind of rotating forward positive voltage feedback circuit | |
| CN106451064A (en) | Method of improving reliability of pulse constant current source | |
| CN104253544A (en) | Compensating circuit of control chip of switch power source | |
| CN103049033B (en) | Constant current source circuit and sampling circuit | |
| CN206389278U (en) | Self-excited switching power supply circuit | |
| CN103579995B (en) | Direct-current input switching power source and undervoltage protection circuit thereof | |
| CN207133684U (en) | A kind of circuit for generating source voltage | |
| CN102931833A (en) | Circuit for converting high voltage into low voltage in analogue circuit | |
| CN203025328U (en) | Adjustable active load circuit | |
| CN107562116A (en) | A kind of circuit for generating source voltage | |
| CN101783661A (en) | High-accuracy hysteresis comparator circuit and operating method thereof | |
| CN108227812A (en) | A kind of high stability high precision current source circuit | |
| CN103441491A (en) | Method for achieving paralleled current sharing of high-voltage and high-power source | |
| CN208971372U (en) | Driving circuit applied to DC-DC converter | |
| CN206542330U (en) | A kind of auto-excitation type Buck converters based on controllable accurate source of stable pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140423 |