CN101604912A - Switching type boost-buck power supplier and control method thereof - Google Patents
Switching type boost-buck power supplier and control method thereof Download PDFInfo
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- CN101604912A CN101604912A CNA2008101099339A CN200810109933A CN101604912A CN 101604912 A CN101604912 A CN 101604912A CN A2008101099339 A CNA2008101099339 A CN A2008101099339A CN 200810109933 A CN200810109933 A CN 200810109933A CN 101604912 A CN101604912 A CN 101604912A
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Abstract
The present invention proposes a kind of switching type boost-buck power supplier, comprises: first loop comprises: mutual first switch and the second switch that is electrically connected, and an end of this first switch is electrically connected on input voltage, an end ground connection of this second switch; And first control circuit, in order to control the operation of first and second switches; Second loop comprises: mutual the 3rd switch and the 4th switch that is electrically connected, and an end ground connection of the 3rd switch, an end of the 4th switch is electrically connected on output voltage; And second control circuit, in order to control the operation of third and fourth switch; And inductor circuit, be electrically connected between the node of the node of first and second switch room and the 3rd and the 4th switch room.
Description
Technical field
The present invention relates to a kind of switching type boost-buck power supplier (buck-boost switchingregulator) and control method thereof, be meant a kind of high efficiency switching type boost-buck power supplier that has especially, with and control method.
Background technology
Fig. 1 marks the roughly circuit structure of existing switching type boost-buck power supplier 1, includes four switch SW 1～SW4 in the circuit 1, all controls by same control circuit 14.Circuit 1 is compared with reference voltage Vref in error amplifier 12 from output extraction feedback voltage FB, and how its comparative result input control circuit 14 controls four switch SW 1～SW4 of switching with decision.
In the above-mentioned prior art, shortcoming is that four switch SW 1～SW4 are controlled by in same loop, all can move in the same cycle, so its cut-out loss (switching loss) is higher, and in other words efficient is lower.And the whole frequency range of power supply unit is subjected to the restriction of boost mode.
In view of this, the present invention proposes a kind of high efficiency switching type boost-buck power supplier that has promptly at above-mentioned the deficiencies in the prior art, with and control method.
Summary of the invention
First purpose of the present invention is to overcome the deficiencies in the prior art and defective, proposes a kind of high efficiency switching type boost-buck power supplier.
Second purpose of the present invention is, proposes a kind of control method of switching type boost-buck power supplier.
For reaching above-mentioned purpose, with regard to one of them viewpoint, the invention provides a kind of switched power supply, wherein comprise:
First loop comprises: mutual first switch and the second switch that is electrically connected, and an end of this first switch is electrically connected on input voltage, an end ground connection of this second switch; And first control circuit, in order to control the operation of first and second switches;
Second loop comprises: mutual the 3rd switch and the 4th switch that is electrically connected, and an end ground connection of the 3rd switch, an end of the 4th switch is electrically connected on output voltage; And second control circuit, in order to control the operation of third and fourth switch; And
Inductor circuit is electrically connected between the node of the node of first and second switch room and the 3rd and the 4th switch room.
In the above-mentioned switching type boost-buck power supplier, compare feedback voltage respectively with second loop in described first loop with different reference voltages, or different feedback voltages is compared with identical reference voltage.
In addition, for reaching above-mentioned purpose, with regard to another viewpoint, the present invention also provides a kind of control method of switching type boost-buck power supplier, comprise following steps: provide a switched power supply, this switched power supply comprises first switch and the second switch of mutual electrical connection, and an end of this first switch is electrically connected on input voltage, an end ground connection of this second switch; Mutual the 3rd switch and the 4th switch that is electrically connected, an end ground connection of the 3rd switch, an end of the 4th switch is electrically connected on output voltage; And inductor circuit, be electrically connected between the node of the node of first and second switch room and the 3rd and the 4th switch room; And control first and second switch, and control the 3rd and the 4th switch with second control circuit with first control circuit.
Preferably, in above-mentioned switching type boost-buck power supplier and the control method, when input voltage was higher than output voltage, the 3rd switch kept opening circuit, and the 4th switch keeps conducting; When input voltage was lower than output voltage, first switch kept conducting, and second switch keeps opening circuit.
Illustrate in detail below by specific embodiment, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached; Wherein, similar element indicates with identical symbol.
Description of drawings
Fig. 1 is the schematic circuit diagram of the switching type boost-buck power supplier of prior art;
Fig. 2 is the schematic circuit diagram of one of them embodiment of switching type boost-buck power supplier of the present invention.
Symbol description among the figure
1 switching type boost-buck power supplier (prior art)
2 switching type boost-buck power suppliers (the present invention)
12 error amplifiers
14 control circuits
22 error amplifiers
24 step-down control circuits
26 error amplifiers
28 boost control circuits
The FB feedback voltage
SW1～SW4 switch
The Vin input voltage
The Vout output voltage
Vref, Vref-Δ V reference voltage
Embodiment
Please refer to Fig. 2, wherein the mode with schematic circuit diagram shows one of them embodiment of the present invention.As shown in the figure, in switching type boost-buck power supplier 2 of the present invention, be two switch SW 3, the SW4 that separately controls two switch SW 1, SW2 and boost modes of decompression mode.
In detail, come control switch SW1, SW2 by error amplifier 22 and step-down control circuit 24 in the circuit 2, and come control switch SW3, SW4 by error amplifier 26 and boost control circuit 28.When input voltage vin is relatively higher than output voltage V out, when being enough to support the reduced pressure operation pattern, switch SW 3 keeps opening circuit, SW4 keeps conducting, and switch SW 1, SW2 are then under the control of step-down control circuit 24, switch according to demand, make the state of circuit balancing at FB=Vref.
When input voltage vin descends to the relative value of output voltage V out, during so that Vref-Δ V＜FB＜Vref, switch SW 1, SW2 will operate with 100% work week (duty cycle), but output voltage V out still can descend, until arriving FB=Vref-Δ V.This moment, circuit 2 entered the boost operations pattern, and switch SW 3, SW4 switch under the control of step-down control circuit 28 according to demand, and switch SW 1 then keeps conducting, SW2 to keep opening circuit, and makes the state of circuit balancing at FB=Vref-Δ V.
More than SW1～the SW4 in the explanation for example can use NMOS or PMOS transistor to make.
Compare with the prior art of Fig. 1, advantage of the present invention comprises:
One, four switches adhere to two loops separately, and therefore indivedual controls do not have the situation generation that four switches operated simultaneously in the same cycle; The switch cost of circuit of the present invention is lower.
Two, because the control loop of step-down and boost mode is different, thus the operation frequency range of decompression mode needn't to be subject to operation frequency range and its transient response of boost mode also preferable.
Three, decompression mode can operate to 100% work week always, just enter boost mode afterwards, so its efficient is preferable, and the conversion between step-down and boost mode was more smooth and easy.
Four, the setting of Δ V has elasticity, makes circuit can more adapt to the demand of application end.
Below at preferred embodiment the present invention is described, just the above for making those skilled in the art be easy to understand content of the present invention, is not to be used for limiting protection scope of the present invention only.For those skilled in the art, when can in spirit of the present invention, thinking immediately and various equivalence variation; For example, shown among each embodiment, for example in the dividing potential drop mode, from output extraction feedback voltage signal, for comparing with reference voltage Vref or Vref-Δ V, but the mode of extraction feedback signal is not limited thereto; Same feedback voltage FB is compared with different reference voltage Vref or Vref-Δ V, also can change into relatively feedback voltage FB and feedback voltage FB+ Δ FB and identical reference voltage Vref; Δ V or Δ FB not necessarily need make with the circuit element of entity, also can reach with input bias voltage (input offset voltage) in error amplifier 22 and 26.So all according to a notion of the present invention and spirit impartial for it a variation or modification, all should be included in the scope of claims of the present invention.
Claims (14)
1. a switching type boost-buck power supplier is characterized in that, comprises:
First loop comprises: mutual first switch and the second switch that is electrically connected, and an end of this first switch is electrically connected on input voltage, an end ground connection of this second switch; With
First control circuit is in order to control the operation of first and second switches;
Second loop comprises: mutual the 3rd switch and the 4th switch that is electrically connected, and an end ground connection of the 3rd switch, an end of the 4th switch is electrically connected on output voltage; And second control circuit, in order to control the operation of third and fourth switch; And
Inductor circuit is electrically connected between the node of the node of first and second switch room and the 3rd and the 4th switch room.
2. switching type boost-buck power supplier as claimed in claim 1, wherein, when input voltage was higher than output voltage, the 3rd switch kept opening circuit, and the 4th switch keeps conducting.
3. switching type boost-buck power supplier as claimed in claim 1, wherein, when input voltage was lower than output voltage, first switch kept conducting, and second switch keeps opening circuit.
4. switching type boost-buck power supplier as claimed in claim 1, wherein, first loop also comprises first error amplifier, this first error amplifier will be compared with first reference voltage from first feedback voltage of output extraction.
5. switching type boost-buck power supplier as claimed in claim 4, wherein, second loop also comprises second error amplifier, this second error amplifier will be compared with second reference voltage from first feedback voltage of output extraction.
6. switching type boost-buck power supplier as claimed in claim 5, wherein, this second reference voltage is lower than this first reference voltage.
7. switching type boost-buck power supplier as claimed in claim 4, wherein, second loop also comprises second error amplifier, and this second error amplifier will be compared with first reference voltage from second feedback voltage of output extraction, and this second feedback voltage is higher than first feedback voltage.
8. the control method of a switching type boost-buck power supplier is characterized in that, comprises following steps:
A switched power supply is provided, and this switched power supply comprises first switch and the second switch of mutual electrical connection, and an end of this first switch is electrically connected on input voltage, an end ground connection of this second switch; Mutual the 3rd switch and the 4th switch that is electrically connected, an end ground connection of the 3rd switch, an end of the 4th switch is electrically connected on output voltage; And inductor circuit, be electrically connected between the node of the node of first and second switch room and the 3rd and the 4th switch room; And
Control first and second switch with first control circuit, and control the 3rd and the 4th switch with second control circuit.
9. control method as claimed in claim 8, wherein, when input voltage was higher than output voltage, the 3rd switch kept opening circuit, and the 4th switch keeps conducting.
10. control method as claimed in claim 8, wherein, when input voltage was lower than output voltage, first switch kept conducting, and second switch keeps opening circuit.
11. control method as claimed in claim 8 wherein, also comprises following steps: extract first feedback voltage from output; This first feedback voltage is compared with first reference voltage; Control this first control circuit according to comparative result.
12. control method as claimed in claim 11 wherein, also comprises following steps: extract first feedback voltage from output; This first feedback voltage is compared with second reference voltage; Control this second control circuit according to comparative result.
13. control method as claimed in claim 12, wherein, this second reference voltage is lower than this first reference voltage.
14. control method as claimed in claim 11 wherein, also comprises following steps: extract second feedback voltage from output; This second feedback voltage is compared with first reference voltage, and wherein this second feedback voltage is higher than first feedback voltage; Control this second control circuit according to comparative result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101099339A CN101604912A (en) | 2008-06-11 | 2008-06-11 | Switching type boost-buck power supplier and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101099339A CN101604912A (en) | 2008-06-11 | 2008-06-11 | Switching type boost-buck power supplier and control method thereof |
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| CN101604912A true CN101604912A (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101099339A Pending CN101604912A (en) | 2008-06-11 | 2008-06-11 | Switching type boost-buck power supplier and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009637A (en) * | 2014-06-10 | 2014-08-27 | 澳特翼南京电子科技有限公司 | Buck-boost switching voltage regulator |
| CN110168892A (en) * | 2018-08-02 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of traditional direct current booster circuit |
| TWI677175B (en) * | 2017-03-31 | 2019-11-11 | 大陸商萬民半導體（澳門）有限公司 | Switch mode power system, inductor current sensing device and method thereof, slpoe sensing device and method thereof |
-
2008
- 2008-06-11 CN CNA2008101099339A patent/CN101604912A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009637A (en) * | 2014-06-10 | 2014-08-27 | 澳特翼南京电子科技有限公司 | Buck-boost switching voltage regulator |
| CN104009637B (en) * | 2014-06-10 | 2016-08-24 | 澳特翼南京电子科技有限公司 | A kind of BUCK-BOOST switching voltage adjuster |
| TWI677175B (en) * | 2017-03-31 | 2019-11-11 | 大陸商萬民半導體（澳門）有限公司 | Switch mode power system, inductor current sensing device and method thereof, slpoe sensing device and method thereof |
| CN110168892A (en) * | 2018-08-02 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of traditional direct current booster circuit |
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Open date: 20091216 |