CN101154885A - Width pulse modulation booster system and its starting method - Google Patents
Width pulse modulation booster system and its starting method Download PDFInfo
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- CN101154885A CN101154885A CNA2006101524692A CN200610152469A CN101154885A CN 101154885 A CN101154885 A CN 101154885A CN A2006101524692 A CNA2006101524692 A CN A2006101524692A CN 200610152469 A CN200610152469 A CN 200610152469A CN 101154885 A CN101154885 A CN 101154885A
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Abstract
The invention discloses a pulse-width modulation boost system and the starting method thereof. The pulse-width modulation boost system comprises a boost circuit, a voltage division circuit, a comparator, a pulse-width modulation circuit, a front oscillator and a current limiting circuit. The start method includes: (1) an error voltage is provided; (2) a pulse-width modulation signal is generated according to the error voltage; (3) a switch in a boost circuit is controlled through the pulse-width modulation signal to control the inductance current flowing through a boost inductance in the boost circuit; (4) the inductance current is used to charge a capacitor in the boost circuit, and the stored charge of the capacitor defines a DC output voltage; (5) a feedback voltage is provided to adjust the error voltage according to the DC output voltage.
Description
Technical field
The present invention relates to a kind of Width pulse modulation booster system (pulse width modulation boost system) and startup method thereof, especially refer to a kind of Width pulse modulation booster system and startup method thereof with current limliting soft start (current limit soft-start) function.
Background technology
Fig. 1 is a conventional Width pulse modulation booster system 1, and it comprises a booster circuit 10, a pulse-width modulation circuit (pulsewidth modulation circuit) 11, one preceding oscillator (pre-oscillator) 12, a comparator 13, a bleeder circuit 14 and a stabilizing circuit 15.Fig. 2 (a) and 2 (b) are for showing the output voltage V of Width pulse modulation booster system 1 respectively
OutCoherent signal figure when connecting a underloading (light load) and a heavy duty (heavy load).Signal V
Out, V
EO1And I
L1The inductive current of representing a boost inductance L1 in the VD of described Width pulse modulation booster system 1, the voltage (being error voltage) of node EO1 that connects described comparator 13 and described pulse-width modulation circuit 11 and the described booster circuit 10 of flowing through respectively.Described stabilizing circuit 15 comprises a resistance R 3 and a capacitor C 2 that is serially connected with between node EO1 and the earth terminal.
With reference to figure 2 (a), when Width pulse modulation booster system 1 starts, a reference voltage V
RefPut on the non-inverting input of described comparator 13, the inverting input of described comparator 13 then connects the feedback voltage V from described bleeder circuit 14
FB, with definition VD V
OutSize.As VD V
OutLess than one first predetermined voltage V
UvloWhen (undervoltage lockout voltage) (preceding oscillation period), oscillator signal S before described preceding oscillator 12 outputs one
OSCTo described pulse-width modulation circuit 11, to generate a pulse-width signal S
PWMIn the oscillation period, described comparator 13 not output signal (is V before described in attention
EO1Level be 0).Described pulse-width signal S
PWMIn order to the time that changes switch SW 1 conducting or close, make by the first voltage V
InThe inductive current I of the generation and the described boost inductance L1 that flows through
L1Can charge to capacitor C 1 off and on, and make the described VD V of the charge generation that is stored in the capacitor C 1
OutThe diode D1 direction of limiting capacitance C1 discharge then wherein.Enter the pulse-width modulation after date, described VD V
OutRemain on the described first predetermined voltage V
UvloA period of time.As described VD V
OutWhen up increasing, will be accompanied by inductive current I
L1Produce inrush current (inrush current); Treat described VD V
OutBe increased to one second predetermined voltage V
Ref* DIV (wherein, DIV=(R1+R2)/R2), described inductive current I
L1Just descend.
With reference to figure 2 (b), the operation of its preceding oscillation period is identical with Fig. 2 (a).Yet, after current oscillation period finishes,, cause signal V because of the output of described Width pulse modulation booster system 1 connects a heavy duty
EO1Under two kinds of operator schemes of preceding oscillation period and pwm period, constantly switch, and can't make described pulse-width modulation circuit 11 produce a suitable pulse-width signal S
PWMThe result makes described VD V
OutAlways at the described first predetermined voltage V
UvloNear vibration, and can't reach the described second predetermined voltage V
Ref* DIV (promptly described Width pulse modulation booster system 1 can't be started smoothly).
Summary of the invention
The purpose of this invention is to provide a kind of Width pulse modulation booster system (pulse width modulation boost system), cooperate one to enable signal (enable signal) comparator that oscillation period starts before by increasing a current-limiting circuit and, can start smoothly when heavily loaded to eliminate the inrush current when the light-load starting and to make to connect.
Another object of the present invention provides a kind of startup method of Width pulse modulation booster system, by the flow through inductive current of a boost inductance and described before, start a comparator in the oscillation period of restriction, can start smoothly when heavily loaded to eliminate the inrush current when the light-load starting and to make to connect.
For achieving the above object, the present invention discloses a kind of Width pulse modulation booster system, and it comprises booster circuit, a bleeder circuit, a comparator, a pulse-width modulation circuit, a preceding oscillator and a current-limiting circuit of a boost inductance.Described booster circuit boosts one first voltage to produce a direct current output voltage.Described bleeder circuit utilizes described VD to produce a feedback voltage.Described comparator is in order to compare a reference voltage and described feedback voltage to produce an error voltage.Described pulse-width modulation circuit receives described error voltage to produce a pulse-width signal to control described booster circuit.Oscillator signal was to described pulse-width modulation circuit before oscillator produced one in the oscillation period before described before one.The flow through inductive current of described boost inductance of described current-limiting circuit control one.Wherein during described VD is less than one first predetermined voltage, define described preceding oscillation period, and during described VD is greater than described first predetermined voltage, define a pwm period.
The present invention discloses a kind of startup method of Width pulse modulation booster system in addition, and it comprises following steps: (1) provides an error voltage; (2), produce a pulse-width signal according to described error voltage; (3) control a switch in the booster circuit by described pulse-width signal, to control an inductive current of flowing through a boost inductance in the described booster circuit; (4) utilize described inductive current to the charging of the electric capacity in the described booster circuit, the stored charge of wherein said electric capacity defines a direct current output voltage: and (5) provide a feedback voltage to adjust described error voltage according to described VD.Oscillation period before described VD is defined as one during less than one first predetermined voltage is wherein enabled signal enabling via one in the oscillation period and is produced and be defined as a pwm period and described error voltage during described VD is greater than described first predetermined voltage before described.
Description of drawings
Fig. 1 is a conventional Width pulse modulation booster system;
Fig. 2 (a) and 2 (b) are the coherent signal figure the when output voltage of displayed map 1 connects a underloading and a heavy duty respectively;
Fig. 3 is a Width pulse modulation booster system schematic diagram of the present invention;
Fig. 4 (a) and 4 (b) are the coherent signal figure the when output voltage of displayed map 3 connects a underloading and a heavy duty respectively; And
Fig. 5 is the startup method flow diagram of the Width pulse modulation booster system 2 of Fig. 3.
Embodiment
Fig. 3 is Width pulse modulation booster system 2 schematic diagrames of the present invention.Fig. 4 (a) and 4 (b) are for showing the output voltage V of Width pulse modulation booster system 2 of the present invention respectively
OutCoherent signal figure when connecting a underloading and a heavy duty.Described Width pulse modulation booster system 2 comprises booster circuit 20, a bleeder circuit 24, a comparator 23, a pulse-width modulation circuit 21, one preceding oscillator 22, a current-limiting circuit 26 and the stabilizing circuit 27 of a boost inductance L2.Described booster circuit 20 comprises one and connects one first voltage V
InBoost inductance L2, diode D2 and that a switch SW 2, of connecting with described boost inductance L2 is connected in described boost inductance L2 and described switch SW 2 be connected in capacitor C 3 between a described diode D2 and an earth terminal.Described capacitor C 3 charge stored are in order to produce described VD V
OutDescribed booster circuit 20 is by the ON time of the described switch SW 2 of control and off and on to capacitor C 3 chargings, with the first voltage V
InBoost and generate VD V
OutDescribed bleeder circuit 24 comprises one at present embodiment and connects first resistance R 4 of described diode D2 and second resistance R 5 between described first resistance R 4 of connection and the described earth terminal.Described bleeder circuit 24 utilizes described VD V
OutProduce a feedback voltage V
FBAs described VD V
OutDuring less than one first predetermined voltage (in preceding oscillation period), one enables signal ENABLE starts described comparator 23 to compare a reference voltage V
RefAnd described feedback voltage V
FBTo produce an error voltage V
EO2(being the voltage of node EO2).Described pulse-width modulation circuit 21 receives described error voltage V
EO2To produce a pulse-width signal S
PWMTo control described booster circuit 20.Oscillator signal S before oscillator 22 produces one in the oscillation period before described before one
OSCTo described pulse-width modulation circuit 21.The flow through inductive current I of described boost inductance L2 of described current-limiting circuit 26 controls one
L2Described stabilizing circuit 27 comprises a resistance R 6 and a capacitor C 4 that is serially connected with between node EO2 and the earth terminal.Wherein as described VD V
Out(at this example is undervoltage lockout voltage, V less than described first predetermined voltage
Uvlo) during be defined as described before oscillation period, and as described VD V
OutGreater than being defined as a pwm period during described first predetermined voltage.
Fig. 5 is the startup method flow diagram of the Width pulse modulation booster system 2 of Fig. 3.One error voltage V at first is provided
EO2(step S10).Referring to Fig. 4 (a) and 4 (b), in preceding oscillation period, the described signal ENABLE that enables starts described comparator 23 to produce described error voltage V
EO2Simultaneously, oscillator signal S before preceding oscillator 22 also produces
OSC21 of pulse-width modulation circuits are according to oscillator signal S before described
OSCAnd produce a pulse-width signal S
PWM(step S20).Described pulse-width signal S
PWMThen control the ON time of the switch SW 2 in the booster circuit 20, to control an inductive current I who flows through a boost inductance L2 in the described booster circuit 20
L2(step S30).Then, utilize described inductive current I
L2To a capacitor C 3 chargings in the described booster circuit 20, the electric charge that wherein is stored in capacitor C 3 defines described VD V
Out(step S40).As described VD V
OutGreater than the described first predetermined voltage V
UvloThe time (entering pwm period), inductive current I
L2Also along with increase.This moment, current-limiting circuit 26 was utilized the described inductive current I of node S sensing
L2, then limit described inductive current I with a upper current limit value
L2, at last then according to the described inductive current I of restriction
L2The result, transmit a control signal Crt and get back to pulse-width modulation circuit 21 to adjust pulse-width signal S
PWMNote, in pwm period, described pulse-width signal S
PWMBe according to described error voltage V
EO2And cooperate a carrier signal (carrier signal) of a pulse-width modulation circuit 21 inside and produce.Wherein said upper current limit value can be adjusted in time.In the present embodiment, described upper current limit value is that ladder rises (stepwise increasing) up to a rated current higher limit.According to described VD V
Out, bleeder circuit 24 will provide a feedback voltage V
FBTo comparator 23 and reference voltage V
RefMake comparisons, to adjust described error voltage V
EO2(step S50).
Difference comparison diagram 4 (a) and 2 (a) and Fig. 4 (b) and 2 (b), the VD of utilizing Width pulse modulation booster system of the present invention to produce, no matter be under the situation that connects underloading or heavy duty, in preceding oscillation period and in the pwm period, all can increase to one second predetermined voltage in time, there is no situation (ginseng Fig. 2 (the b)) generation that VD is stagnated the situation (ginseng Fig. 2 (a)) in first predetermined voltage or vibrated therebetween near first predetermined voltage.In addition, by the use of current-limiting circuit, can effectively reduce the generation of inrush current.The intended purposes that can start smoothly when inrush current when therefore, Width pulse modulation booster system of the present invention and startup method thereof can reach the elimination light-load starting really and heavy duty.
Technology contents of the present invention and technical characterstic disclose as above, yet the those skilled in the art still may be based on teaching of the present invention and announcement and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by appending claims.
Claims (14)
1. Width pulse modulation booster system is characterized in that comprising:
One booster circuit comprises a boost inductance, and described booster circuit boosts one first voltage to produce a direct current output voltage;
One bleeder circuit utilizes described VD to produce a feedback voltage;
One comparator compares a reference voltage and described feedback voltage to produce an error voltage in a pwm period;
One pulse-width modulation circuit receives described error voltage to produce a pulse-width signal to control described booster circuit;
Oscillator before one produces a preceding oscillator signal to described pulse-width modulation circuit in the oscillation period before one; And
One current-limiting circuit, the inductive current that described boost inductance is flowed through in control one;
Wherein during described VD is less than one first predetermined voltage, be defined as described preceding oscillation period, and during described VD is greater than described first predetermined voltage, be defined as described pwm period.
2. Width pulse modulation booster system as claimed in claim 1 is characterized in that described booster circuit comprises in addition:
One switch of connecting with described boost inductance, the ON time of described switch is controlled by described pulse-width signal;
One diode is connected in the contact of described boost inductance and described switch; And
One electric capacity is connected between a described diode and the earth terminal to produce described VD.
3. Width pulse modulation booster system as claimed in claim 2 is characterized in that described bleeder circuit comprises:
One first resistance is connected in described diode; And
One second resistance is connected between described first resistance and the described earth terminal, and wherein said feedback voltage is taken from the contact of described first resistance and described second resistance.
4. Width pulse modulation booster system as claimed in claim 1 is characterized in that the level of described VD is being right after interim one second predetermined voltage that increases in time of described pulse-width modulation behind the oscillation period before described.
5. the startup method of a Width pulse modulation booster system is characterized in that comprising following steps:
One error voltage is provided;
According to described error voltage, produce a pulse-width signal;
Control a switch in the booster circuit by described pulse-width signal, to control an inductive current of flowing through a boost inductance in the described booster circuit;
Utilize described inductive current to the charging of the electric capacity in the described booster circuit, the stored charge of wherein said electric capacity defines a direct current output voltage; And
According to described VD, provide a feedback voltage to adjust described error voltage;
Oscillation period before wherein during described VD is less than one first predetermined voltage, being defined as one, and during described VD is greater than described first predetermined voltage, be defined as a pwm period.
6. the startup method of Width pulse modulation booster system as claimed in claim 5, the step that it is characterized in that adjusting described error voltage is that a described feedback voltage and a reference voltage are compared.
7. the startup method of Width pulse modulation booster system as claimed in claim 5 is characterized in that described error voltage is produced by a comparator.
8. the startup method of Width pulse modulation booster system as claimed in claim 7 is characterized in that described comparator enables signal by one in the oscillation period and started before described.
9. the startup method of Width pulse modulation booster system as claimed in claim 5 is characterized in that described error voltage rises in the oscillation period in time before described.
10. the startup method of Width pulse modulation booster system as claimed in claim 5 is characterized in that described pulse-width signal produces according to a preceding oscillator signal in the oscillation period before described.
11. the startup method of Width pulse modulation booster system as claimed in claim 5, it is characterized in that described pulse-width signal in described pwm period according to described error voltage and cooperate a carrier signal of a pulse-width modulation circuit inside to produce.
12. the startup method of Width pulse modulation booster system as claimed in claim 5 is characterized in that described VD rises to one second predetermined voltage in time in described pwm period.
13. the startup method of Width pulse modulation booster system as claimed in claim 5 is characterized in that the step of controlling described inductive current comprises following steps:
The described inductive current of sensing;
Limit described inductive current with a upper current limit value; And
Result according to the described inductive current of restriction adjusts described pulse-width signal.
14. the startup method of Width pulse modulation booster system as claimed in claim 13 is characterized in that described upper current limit value can adjust in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101524692A CN101154885A (en) | 2006-09-29 | 2006-09-29 | Width pulse modulation booster system and its starting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101524692A CN101154885A (en) | 2006-09-29 | 2006-09-29 | Width pulse modulation booster system and its starting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101154885A true CN101154885A (en) | 2008-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101524692A Pending CN101154885A (en) | 2006-09-29 | 2006-09-29 | Width pulse modulation booster system and its starting method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667019A (en) * | 2009-07-01 | 2010-03-10 | 成都诺奇尔微电子技术有限公司 | Control method and circuit of double-module modulation and mode smooth conversion switching power supply |
| CN102497097A (en) * | 2011-12-08 | 2012-06-13 | 上海交通大学 | Ultra-low-voltage booster circuit for solar power generation |
| CN106020309A (en) * | 2016-07-11 | 2016-10-12 | 孟令冬 | High-voltage biasing circuit |
| CN106257810A (en) * | 2015-06-22 | 2016-12-28 | 晶宏半导体股份有限公司 | Boost converter for reducing injection current and driving method thereof |
| WO2018201768A1 (en) * | 2017-05-04 | 2018-11-08 | 深圳市中移联半导体科技有限公司 | Current-limiting starting method and circuit for boost converter |
-
2006
- 2006-09-29 CN CNA2006101524692A patent/CN101154885A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667019A (en) * | 2009-07-01 | 2010-03-10 | 成都诺奇尔微电子技术有限公司 | Control method and circuit of double-module modulation and mode smooth conversion switching power supply |
| CN101667019B (en) * | 2009-07-01 | 2012-10-03 | 成都诺奇尔微电子技术有限公司 | Control method and circuit of double-module modulation and mode smooth conversion switching power supply |
| CN102497097A (en) * | 2011-12-08 | 2012-06-13 | 上海交通大学 | Ultra-low-voltage booster circuit for solar power generation |
| CN106257810A (en) * | 2015-06-22 | 2016-12-28 | 晶宏半导体股份有限公司 | Boost converter for reducing injection current and driving method thereof |
| CN106257810B (en) * | 2015-06-22 | 2018-06-26 | 晶宏半导体股份有限公司 | Boost converter for reducing injection current and driving method thereof |
| CN106020309A (en) * | 2016-07-11 | 2016-10-12 | 孟令冬 | High-voltage biasing circuit |
| WO2018201768A1 (en) * | 2017-05-04 | 2018-11-08 | 深圳市中移联半导体科技有限公司 | Current-limiting starting method and circuit for boost converter |
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