CN102790525A - Pulse width control circuit applied in BOOST converter - Google Patents
Pulse width control circuit applied in BOOST converter Download PDFInfo
- Publication number
- CN102790525A CN102790525A CN2012102495599A CN201210249559A CN102790525A CN 102790525 A CN102790525 A CN 102790525A CN 2012102495599 A CN2012102495599 A CN 2012102495599A CN 201210249559 A CN201210249559 A CN 201210249559A CN 102790525 A CN102790525 A CN 102790525A
- Authority
- CN
- China
- Prior art keywords
- voltage
- pipe
- stabiliser tube
- converter
- output
- 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.)
- Granted
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a pulse width control circuit applied in a BOOST converter. The pulse width control circuit specifically comprises a V-I converter, a capacitance element, a constant current source, a first phase converter, a second phase converter, a two-input AND gate, a first NMOS (N-Metal-Oxide-Semiconductor) tube, a second NMOS tube and a third NMOS tube. According to the pulse width control circuit, the V-I converter is utilized to realize adjustment of the pulse width of a switch tube of the BOOST converter through electric current comparison, an EA (error amplifier), a voltage comparator and other modules of the traditional structure are saved, power consumption and difficulty on design of the circuit are greatly lowered, structure of the circuit becomes simple, so that integrity is increased, and cost is lowered.
Description
Technical field
The invention belongs to power technique fields, the design of the pulse width control circuit in particularly a kind of BOOST converter.
Background technology
Along with the high speed development of power electronic technology, the relation of power electronic equipment and people's work, life is close day by day, and a stable power is the requisite part of electronic equipment.The BOOST converter is a kind of common booster switcher power supply, and the output that stablize BOOST needs the pulse duration that negative feedback network is regulated switching tube in the BOOST converter.
Existing traditional BOOST pulse width control circuit adopts voltage ratio mode shown in accompanying drawing 1, wherein,
In the formula, V
oThe output voltage of expression BOOST converter, V
DcThe DC input voitage of expression BOOST converter, T
OnThe duty ratio of the grid control signal of expression BOOST converter switches pipe, R representes the load resistance of BOOST converter, and T representes the cycle of the grid control signal of BOOST converter switches pipe, and L representes the energy storage inductor in the BOOST converter.This control mode can realize the accurate control of output voltage; But also come with some shortcomings; Such as: circuit needs the voltage comparator of a Vref reference voltage, an EA amplifier and a PWM, and for the realization more complicated of circuit, the power consumption of circuit is bigger like this; Especially a reliable EA amplifier needs to stablize compensating circuit accordingly, and this has increased the difficulty of circuit design and the power consumption of circuit.
Summary of the invention
The objective of the invention is to have proposed a kind of pulse width control circuit of the BOOST of being used for converter in order to solve the baroque problem of BOOST pulse width control circuit of existing voltage ratio than type.
Technical scheme of the present invention is: a kind of pulse width control circuit of the BOOST of being used for converter; Specifically comprise: a V-I converter, a capacity cell, a constant-current source, first inverter, second inverter, one or two inputs and door, NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe
Wherein,
Said V-I converter is used for converting the output voltage of said BOOST converter into electric current; The output of its input termination BOOST converter, the drain electrode of output termination the one NMOS pipe, the grid of NMOS pipe, the grid of the 2nd NMOS pipe and the drain electrode of the 3rd NMOS pipe;
The source ground of said NMOS pipe; The grid of said the 3rd NMOS pipe connects outside square-wave signal; The source ground of said the 3rd NMOS pipe, the source ground of said the 2nd NMOS pipe, the DC power supply that first termination of said constant-current source is outside; Drain electrode, first end of said capacity cell and the input of first inverter of said the 2nd NMOS pipe of second termination of said constant-current source; The second end ground connection of said capacity cell, the input of said second inverter of output termination of said first inverter, output termination two inputs of said second inverter and the first input end of door; The grid of said the 3rd NMOS pipe of the second input termination of said two inputs and door, the output of said two inputs and door is as the output of said pulse width control circuit.
Beneficial effect of the present invention: pulse width control circuit of the present invention has adopted the V-I converter; Realized relatively regulating the pulsewidth of BOOST converter switches pipe with electric current; Saved modules such as the EA amplifier in the traditional structure, voltage comparator, greatly reduced the difficulty of circuit power consumption and circuit design, it is simple that circuit structure becomes; Thereby improved integrated level, reduced cost.
Description of drawings
Fig. 1 is a relatively type BOOST converter pulse width control circuit structural representation of traditional voltage.
Fig. 2 is the pulse width control circuit structural representation that is used for the BOOST converter that the present invention realizes.
Fig. 3 is the practical implementation exemplary circuit figure of circuit of the present invention.
Embodiment
In order to make current ratio of the present invention than the BOOST control circuit technical scheme of type and advantage is clearer below in conjunction with accompanying drawing and specific embodiment the present invention is done further explanation.
The pulse width control circuit that is used for the BOOST converter of the present invention; As shown in Figure 2; Specifically comprise: a V-I converter, a capacity cell C1, a constant-current source I1, the first inverter Q1, the second inverter Q2, one or two inputs are managed M3 with door Q3, NMOS pipe M1, the 2nd NMOS pipe M2, the 3rd NMOS; Wherein
Said V-I converter is used for converting the output voltage of said BOOST converter into electric current, the output end vo of its input termination BOOST converter, drain electrode, the grid of M1, the grid of M2 and the drain electrode of M3 of output termination M1; The source ground of M1, the grid of M3 connect outside square-wave signal, the source ground of M3; The source ground of M2, the DC power supply VDD that first termination of constant-current source I1 is outside, the input of the drain electrode of the second termination M2 of constant-current source I1, first end of C1 and the first inverter Q1; The second end ground connection of C1; The input of the output termination second inverter Q2 of the first inverter Q1, output termination two inputs of the second inverter Q2 and the first input end of door Q3, the grid of the second input termination M3 of Q3; The output of two inputs and door Q3 connects the control end of BOOST converter switches pipe as the output Vcon of said pulse width control circuit.
The duty ratio that need to prove outside square-wave signal can be chosen according to actual needs, and for the BOOST converter, general duty ratio is greater than 50%.
Inverter Q1 and Q2 effect are: the one, set an inverse values to discharging and recharging of capacity cell; The 2nd, played the effect of voltage waveform being carried out shaping.
Fig. 3 has showed a kind of specific embodiment of the present invention, has used a current-mirror structure to realize the V-I conversion in this specific embodiment, concrete circuit in accompanying drawing 3 the with dashed lines frame go out.This V-I converter comprises: PMOS pipe M4, the 2nd PMOS pipe M5, first resistance R 1, second resistance R 2 and voltage-stabiliser tube assembly; Wherein, The source electrode of M4 pipe and the source electrode of M5 link together as the input of said V-I converter; The grid of M4 pipe connects first end of R1, the negative electrode of the second termination voltage-stabiliser tube pipe assembly of R1, the plus earth of voltage-stabiliser tube pipe assembly with draining; The grid of M5 pipe connects first end of drain electrode connecting resistance R2 of grid, the M5 pipe of M4 pipe, and second end of resistance R 2 is as the output of V-I converter.
The voltage-stabiliser tube assembly here mainly plays metering function, can select according to the actual requirements, in the present embodiment; Because the requirement of actual process; Voltage-stabiliser tube pipe assembly is in series by three voltage-stabiliser tube D1, D2, D3, and promptly the negative electrode of voltage-stabiliser tube D1 is as the negative electrode of voltage-stabiliser tube pipe assembly, and the anode of voltage-stabiliser tube D1 connects the negative electrode of voltage-stabiliser tube D2; The anode of voltage-stabiliser tube D2 connects the negative electrode of voltage-stabiliser tube D3, the anode as voltage-stabiliser tube pipe assembly of voltage-stabiliser tube D3.
The V-I transformer configuration here is simple, has used high voltage stabilizing pipe assembly, has saved the domain face.
The voltage of setting outside DC power supply VDD in the present embodiment is 5V; The representative value of BOOST converter output voltage is 90V; This just requires the PMOS pipe in the V-I converter to be high tension apparatus and the withstand voltage 90V of being greater than; Consider certain allowance, select the withstand voltage of high voltage PMOS device to want more than the 100V at least.Through selecting suitable constant-current source I1, can be so that when the BOOST output voltage be 90V, the electric current after the conversion equals I1.The voltage stabilizing value of each voltage-stabiliser tube is about 28V in the V-I converter, and 3 voltage-stabiliser tube series connection voltage stabilizing value afterwards can reach about 85V, under the prerequisite that guarantees current limliting, can reduce the resistance of R1 greatly like this, and then practice thrift chip area.If the output current of V-I converter is less, can select less constant-current source for use, can reduce the power consumption of circuit like this.The duty ratio of setting M3 square-wave signal that tube grid connects in the accompanying drawing 3 is D.
The operation principle of circuit is following: clear in order to narrate, be divided into the operation principle that 3 kinds of situation are described circuit.
1. in BOOST converter power up, output voltage V o is less than the voltage stabilizing value after 3 voltage-stabiliser tube series connection, and the V-I converter is not worked, and constant-current source I1 is capacity cell C1 charging, and the voltage on electric capacity reaches the upset level V of first inverter
THAfter, second inverter is output as high level, and two inputs at this moment are that duty ratio is the square wave of D with the output signal Vcon of door.
2. when the output voltage of BOOST converter surpass 3 voltage-stabiliser tubes series connection voltage stabilizing value but during less than 90V; The V-I converter is started working, and when the signal of M3 was low level, the output current of V-I converter was mirrored onto the M2 pipe; But this electric current is less than I1; So capacity cell C1 can not discharge, the output of second inverter still remains high level, and the duty ratio of output signal Vcon remains D.
3. when the output voltage of BOOST converter surpasses 90V; The output current of V-I converter is greater than I1, and when the M3 signal was low level, the electric current of M2 pipe was greater than I1 like this; Capacity cell C1 can discharge to M2; The voltage Vc of capacity cell C1 can diminish in the whole low level period always, established when M3 tube grid signal low level finishes, and capacitance voltage Vc is reduced to Vc0.If Vc0 is greater than the upset level V of first inverter
TH, the output of second inverter remains high level, and the duty ratio of Vcon signal is constant.If Vc0 is less than the upset level V of first inverter
TH, then the output voltage of second inverter can rise to V by Vc0 at capacity cell C1 voltage
THKeep low level in the process, and the low level period of this section is exactly the high level time that the Vcon signal reduces, the duty ratio of Vcon can reduce like this, thereby reaches the effect of the output voltage of regulating the BOOST converter.If this time is Td, then the expression formula of Td is following: Td=C* (V
TH-Vc0)/I
1In the formula, V
THBe the upset level of first inverter, the capacitance voltage when Vc0 is the end of M3 tube grid signal low level, C is the appearance value of capacity cell C1, I
1It is the current value of constant-current source I1.
The duty ratio of Vcon signal becomes: D'=D-Td/T, in the formula, T is that initial duty cycle is the cycle of the square wave of D.
Through above-mentioned instance analysis; Can find out; Pulse width control circuit of the present invention is with electric current mode relatively; Realized the control to BOOST converter pulsewidth with a kind of simple and practical structure, this scheme has been saved complicated electric current structure such as the EA amplifier in the traditional structure, voltage comparator, has reduced circuit power consumption and circuit design difficulty.The used number of devices of this structure is few, helps improving chip integration, thereby practices thrift cost.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these teachings disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (3)
1. pulse width control circuit that is used for the BOOST converter specifically comprises: a V-I converter, a capacity cell, a constant-current source, first inverter, second inverter, one or two inputs and door, NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe,
Wherein,
Said V-I converter is used for converting the output voltage of said BOOST converter into electric current; The output of its input termination BOOST converter, the drain electrode of output termination the one NMOS pipe, the grid of NMOS pipe, the grid of the 2nd NMOS pipe and the drain electrode of the 3rd NMOS pipe;
The source ground of said NMOS pipe; The grid of said the 3rd NMOS pipe connects outside square-wave signal; The source ground of said the 3rd NMOS pipe, the source ground of said the 2nd NMOS pipe, the DC power supply that first termination of said constant-current source is outside; Drain electrode, first end of said capacity cell and the input of first inverter of said the 2nd NMOS pipe of second termination of said constant-current source; The second end ground connection of said capacity cell, the input of said second inverter of output termination of said first inverter, output termination two inputs of said second inverter and the first input end of door; The grid of said the 3rd NMOS pipe of the second input termination of said two inputs and door, the output of said two inputs and door is as the output of said pulse width control circuit.
2. pulse width control circuit according to claim 1; It is characterized in that; Described V-I converter specifically comprises: PMOS pipe, the 2nd PMOS pipe, first resistance, second resistance and voltage-stabiliser tube assembly; Wherein, the source electrode of the source electrode of PMOS pipe and the 2nd PMOS pipe links together as the input of said V-I converter, and the grid of PMOS pipe connects first end of first resistance with draining; The negative electrode of the second termination voltage-stabiliser tube pipe assembly of first resistance; The plus earth of voltage-stabiliser tube pipe assembly, the grid of the 2nd PMOS pipe connects first end of drain electrode connecting resistance second resistance of the grid of PMOS pipe, the 2nd PMOS pipe, and second end of first resistance is as the output of V-I converter.
3. pulse width control circuit according to claim 2; It is characterized in that; Described voltage-stabiliser tube pipe assembly is in series by three voltage-stabiliser tube D1, D2, D3, and the negative electrode of voltage-stabiliser tube D1 is as the negative electrode of voltage-stabiliser tube pipe assembly, and the anode of voltage-stabiliser tube D1 connects the negative electrode of voltage-stabiliser tube D2; The anode of voltage-stabiliser tube D2 connects the negative electrode of voltage-stabiliser tube D3, the anode as voltage-stabiliser tube pipe assembly of voltage-stabiliser tube D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210249559.9A CN102790525B (en) | 2012-07-19 | 2012-07-19 | Pulse width control circuit applied in BOOST converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210249559.9A CN102790525B (en) | 2012-07-19 | 2012-07-19 | Pulse width control circuit applied in BOOST converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102790525A true CN102790525A (en) | 2012-11-21 |
| CN102790525B CN102790525B (en) | 2015-01-07 |
Family
ID=47155844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210249559.9A Expired - Fee Related CN102790525B (en) | 2012-07-19 | 2012-07-19 | Pulse width control circuit applied in BOOST converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102790525B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179606A (en) * | 1996-09-02 | 1998-04-22 | 西门子公司 | Current-mode sense amplifier |
| KR20000002636A (en) * | 1998-06-22 | 2000-01-15 | 윤종용 | Clamp pulse generating device and method |
| JP2003133915A (en) * | 2001-10-26 | 2003-05-09 | Fuji Electric Co Ltd | Semiconductor integrated circuit |
| JP2006060455A (en) * | 2004-08-19 | 2006-03-02 | Matsushita Electric Ind Co Ltd | Constant current mirror circuit |
| US20100001707A1 (en) * | 2008-07-01 | 2010-01-07 | Stmicroelectronics S.R.L. | Stepwise ramp voltage generator |
-
2012
- 2012-07-19 CN CN201210249559.9A patent/CN102790525B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179606A (en) * | 1996-09-02 | 1998-04-22 | 西门子公司 | Current-mode sense amplifier |
| KR20000002636A (en) * | 1998-06-22 | 2000-01-15 | 윤종용 | Clamp pulse generating device and method |
| JP2003133915A (en) * | 2001-10-26 | 2003-05-09 | Fuji Electric Co Ltd | Semiconductor integrated circuit |
| JP2006060455A (en) * | 2004-08-19 | 2006-03-02 | Matsushita Electric Ind Co Ltd | Constant current mirror circuit |
| US20100001707A1 (en) * | 2008-07-01 | 2010-01-07 | Stmicroelectronics S.R.L. | Stepwise ramp voltage generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102790525B (en) | 2015-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107070222B (en) | Control method of bidirectional DC/DC power converter control circuit | |
| CN203872056U (en) | Direct-current power supply controlled by constant power | |
| CN103152956A (en) | LED (Light Emitting Diode) driving circuit and constant-current control circuit thereof | |
| CN104467427A (en) | Switching control circuit and method for four-tube Buck-Boost converter | |
| CN105939107B (en) | A kind of quasi- boost switching DC-DC converter of mixed type | |
| CN104201915A (en) | Wide-input range, efficient and voltage-multiplying AC/DC (alternating current/direct current) rectifying circuit applied to piezoelectric energy gaining | |
| CN103633839A (en) | Improved Z-source boosting DC (direct current)-DC converter | |
| CN106992670B (en) | Adaptive turn-on time control circuit for PFM mode boost type DC-DC converter | |
| CN105375762A (en) | Buck-boost conversion circuit, power source management module and liquid crystal drive device | |
| CN104333203A (en) | Frequency-locking circuit and switch power supply control circuit | |
| CN104184319A (en) | Charge pump circuit as well as control circuit and control method thereof | |
| CN111245238B (en) | Three-level Boost circuit control method and system | |
| CN203883673U (en) | Improved Z-source boost DC-DC converter | |
| CN203788189U (en) | Bootstrap boost circuit | |
| CN106787736B (en) | A kind of biswitch high step-up ratio PWM DC converter | |
| Espinosa | Asynchronous non-inverter buck-boost DC to DC converter for battery charging in a solar MPPT system | |
| CN203722474U (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN105490536A (en) | High-gain voltage-lifting quasi Z source converter | |
| Jothi et al. | An enhanced MPPT technique for high gain DC-DC converter for photovoltaic applications | |
| CN202737741U (en) | DC-DC booster circuit | |
| CN101969274A (en) | Bus voltage stabilization control device | |
| Suryoatmojo et al. | Implementation of high voltage gain dc-dc boost converter for fuel cell application | |
| CN102123553A (en) | COT mode LED lighting driving circuit | |
| CN109286317A (en) | A kind of DC converter based on switching capacity | |
| CN102790525B (en) | Pulse width control circuit applied in BOOST converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20150719 |
|
| EXPY | Termination of patent right or utility model |