CN104753344A - Technology for reducing BUCK static current - Google Patents
Technology for reducing BUCK static current Download PDFInfo
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- CN104753344A CN104753344A CN201310738857.9A CN201310738857A CN104753344A CN 104753344 A CN104753344 A CN 104753344A CN 201310738857 A CN201310738857 A CN 201310738857A CN 104753344 A CN104753344 A CN 104753344A
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- drive circuit
- switch element
- ldo
- output
- voltage converter
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Abstract
The invention provides a technology for reducing BUCK static current. According to a BUCK DCDC of the invention, an LDO-mode drive circuit and a gating controller are added on the basis of a conventional BUCK DCDC, and the BUCK DCDC can be switched to an LDO mode when the load at the output end of the BUCK DCDC is low (including no load). The advantage of an LDO, namely, small static current, is utilized in the invention.
Description
Technical field
The present invention relates to a kind of technology reducing BUCK type dcdc converter quiescent current, more specifically, the present invention relates to a kind of BUCK type dcdc converter through improving.
Background technology
In communication and computer realm, the various electronic equipments comprising consumer-elcetronics devices all need power supply to carry out maintenance work.In the electronic equipment using DC source, need to take voltage changer (pressurizer) to be required operating voltage by the voltage transitions of power supply (as battery).
A kind of conventional voltage changer is dcdc converter (although literally, DCDC refers to " direct voltage turns direct voltage ", and industry is many to be at present used for stating Switching Power Supply by DCDC).Dcdc converter can realize step-down (buck), boosting (boost) according to its topological structure, buck (buck-boost).The dcdc converter completing buck functionality is commonly referred to BUCK type DCDC.A kind of BUCK type DCDC of routine as shown in Figure 1A.In Figure 1A, V
dDit is voltage source, wherein PMOS 41 and NMOS tube 42 form switch element 4, under the driving of signal GP and GN of the output stage drive circuit 1 of BUCK type DCDC, PMOS 41 and NMOS tube 42 alternately conducting turn off, the AC signal exported at output node LX is provided for inductance 62 energy storage, provides VD V by integral filtering at electric capacity C two ends
out.Resistor network 5 provides dividing potential drop V
fb, it is input in drive circuit 1, forms closed loop feedback.The two-way output waveform of drive circuit 1 is cycle identical square wave, but by its phase place of adjustment and duty ratio, to guarantee that PMOS 41 and NMOS tube 42 can not be in ON/OFF state simultaneously.The exemplary two-way output waveform of drive circuit 1 as shown in Figure 1B.
BUCK type DCDC has the high advantage of conversion efficiency.But the quiescent current (flowing through the electric current of grounding pin time unloaded) of BUCK is comparatively large, causes electric quantity loss.Obviously, for requiring the mobile electronic device of better flying power all the time, excessive quiescent current is disadvantageous.
Another kind of conventional buck converter is LDO(low pressure difference linear voltage regulator).It is fast that LDO has load response, the advantages such as noise is low, but compare with BUCK type DCDC, and its main deficiency is that conversion efficiency is low.
Summary of the invention
The present invention aims to provide a kind of BUCK type DCDC of improvement, it adds LDO mode driving circuit and Strobe Controller on the basis of conventional BUCK type DCDC, when the load of the output of BUCK type DCDC is lower (when comprising non-loaded), changeable is LDO pattern.
According to an aspect of the present invention, provide a kind of DC voltage converter, comprising: switch element, it connects DC input voitage V
dD; BUCK type DCDC drive circuit, it provides drive singal for described switch element, makes conducting and the closedown repeatedly of described switch element, thus at the output output AC signal of described switch element; Inductance, is connected to the output of described switch element; Electric capacity, is connected between described inductance and ground connection, and the connected node of described inductance and described electric capacity is as output node V
out, the output dc voltage of described DC voltage converter is provided; Resistor network, it is connected to V
outand between ground connection, the dividing potential drop of described output dc voltage is supplied to described BUCK type DCDC drive circuit as feedback voltage; LDO drive circuit, it receives described feedback voltage, and output drive signal is to described switch element, thus works as LDO voltage stabilizing circuit together with described switch element, described resistor network; And gate control circuit, one in BUCK type DCDC drive circuit described in its gating and described LDO drive circuit.
According to an aspect of the present invention, switch element is made up of PMOS and NMOS tube, and the grid of wherein said PMOS and NMOS tube is controlled by the drive singal of described BUCK type DCDC drive circuit, and the source electrode of described PMOS is connected to V
dD, the source ground of described NMOS tube, the drain electrode of described PMOS connects the drain electrode of described NMOS tube and as the output of described switch element, described BUCK type DCDC drive circuit makes described PMOS and the alternately conducting of described NMOS tube.The drive singal of described LDO drive circuit exports to the grid of PMOS.
According to an aspect of the present invention, PNP pipe and NPN is adopted to substitute PMOS in such scheme and NMOS tube equivalently.
According to an aspect of the present invention, described gate control circuit is according to V
outload come in BUCK type DCDC drive circuit described in gating and described LDO drive circuit one.Described gating can comprise: as described V
outload when being greater than predetermined threshold, gating BUCK type DCDC drive circuit; And as described V
outload when being less than predetermined threshold, gating LDO drive circuit.
According to an aspect of the present invention, described predetermined threshold can be 100uA.
According to an aspect of the present invention, described gate control circuit monitors the ON time of described switch element to determine V
outload, or described gate control circuit is monitored to the charging current of electric capacity to determine V
outload.
Accompanying drawing explanation
Figure 1A illustrates a kind of traditional BUCK circuit.
Figure 1B illustrates the exemplary output drive signal of the drive circuit 1 in Figure 1A.
Fig. 2 illustrates according to the BUCK type dcdc converter through improving of the present invention.
Embodiment
The quiescent dissipation of the output stage drive circuit of traditional BUCK type DCDC is higher, such as, reach more than 30uA.By comparison, LDO output stage drive circuit quiescent dissipation can drop to very low, such as, drop to 2uA.Based on this, the present invention proposes a kind of Novel DC voltage changer of BUCK/LDO bimodulus.For ease of illustrating, in embodiment, this novel DC voltage converter is called the BUCK type dcdc converter of improvement.
Fig. 2 illustrates the BUCK type dcdc converter of improvement according to an embodiment of the invention.Element identical with Figure 1A in Fig. 2 repeats no more.Fig. 2 is mainly to the addition of LDO mode driving circuit 2 and Strobe Controller 3 to the improvement of Figure 1A circuit.
As shown in the figure, the output of drive circuit 2 is connected to the grid of PMOS 41.Drive circuit 2 receives Vfb for closed loop feedback.The gating signal of gate control circuit 3 connects drive circuit 1 and drive circuit 2 respectively.When drive circuit 1 is strobed, drive circuit 2 stops.Now circuit reduction is the circuit shown in Figure 1A, according to BUCK work pattern.When drive circuit 2 is strobed, drive circuit 1 stops.Now, NMOS tube 42 disconnects, and drive circuit 2 output drive signal is to control PMOS 41, and inductor 62 is now equivalent to wire.Drive circuit 2, PMOS 41, resistor network 5 and from resistor network 5 to the feedback loop of drive circuit 2, form a complete LDO converter together.
Visible, by utilizing the gate control circuit 3 optionally output stage drive circuit 1 of gating BUCK type DCDC and LDO mode driving circuit 2, provide a kind of voltage changer of BUCK/LDO bimodulus.In order to reach the object reducing quiescent current, can at V
outnon-loaded or load is less (such as, load is less than 100uA) time, be switched to LDO pattern, to play the little advantage of LDO circuit static electric current; At V
outhave comparatively heavy load (such as, load is greater than 100uA) time, be switched to BUCK pattern, to play the high pattern of BUCK circuit conversion efficiency.
Gate control circuit 3 can take the art any can means to monitor V
outload.Exemplarily unrestricted, the opening time (opening time and fill to the electricity of electric capacity C be positively related) of PMOS 41 can be monitored, or monitoring (flows through the electric current of the electric current of PMOS 41/flow through inductance 62 to the charging current of electric capacity.
In the scheme exemplified by Fig. 2, switch element 4 adopts PMOS 41 and NMOS tube 42 to form.It will be understood by those skilled in the art that and PNP pipe and NPN pipe also can be adopted to build switch element 4 equivalently.
New-type voltage translator circuit proposed by the invention comprises both BUCK circuit and LDO circuit.For ease of discussing, applicant is called for " the BUCK type dcdc converter of improvement " in an embodiment, because in most cases, when this voltage converter circuit is used in electronic equipment, under electronic device works state, the voltage transitions of (namely during non-static) is undertaken by BUCK circuit substantially.But applicant is not intended to get rid of other situations, such as, when the threshold value switched when BUCK/LDO bimodulus is chosen higher, or when the chip of electronic equipment is very energy-conservation, electronic equipment does not cause the switching of LDO to BUCK with low loaded work piece.Therefore, should be understood that the present invention is a kind of new-type direct voltage conversion equipment in essence.Protection scope of the present invention should be determined by appended claim, and not by the impact of some address occurred in embodiment.
Claims (10)
1. a DC voltage converter, comprising:
Switch element, it connects DC input voitage V
dD;
BUCK type DCDC drive circuit, it provides drive singal for described switch element, makes conducting and the closedown repeatedly of described switch element, thus at the output output AC signal of described switch element;
Inductance, is connected to the output of described switch element;
Electric capacity, is connected between described inductance and ground connection, and the connected node of described inductance and described electric capacity is as output node V
out, the output dc voltage of described DC voltage converter is provided;
Resistor network, it is connected to V
outand between ground connection, the dividing potential drop of described output dc voltage is supplied to described BUCK type DCDC drive circuit as feedback voltage;
LDO drive circuit, it receives described feedback voltage, and output drive signal is to described switch element, thus works as LDO voltage stabilizing circuit together with described switch element, described resistor network; And
Gate control circuit, one in BUCK type DCDC drive circuit described in its gating and described LDO drive circuit.
2. DC voltage converter as claimed in claim 1, it is characterized in that, described switch element comprises PMOS and NMOS tube, and the grid of wherein said PMOS and NMOS tube is controlled by the drive singal of described BUCK type DCDC drive circuit, and the source electrode of described PMOS is connected to V
dD, the source ground of described NMOS tube, the drain electrode of described PMOS connects the drain electrode of described NMOS tube and as the output of described switch element, described BUCK type DCDC drive circuit makes described PMOS and the alternately conducting of described NMOS tube.
3. DC voltage converter as claimed in claim 2, it is characterized in that, the drive singal of described LDO drive circuit exports the grid of described PMOS to.
4. DC voltage converter as claimed in claim 1, it is characterized in that, described switch element comprises PNP pipe and NPN pipe, and the base stage of wherein said PNP pipe and NPN pipe is controlled by the drive singal of described BUCK type DCDC drive circuit, and the emitter of described PNP pipe is connected to V
dD, the grounded emitter of described NPN pipe, the collector electrode of described PNP pipe connects the collector electrode of described NPN pipe and as the output of described switch element, described BUCK type DCDC drive circuit makes described PNP pipe and described NPN manage alternately conducting.
5. DC voltage converter as claimed in claim 4, it is characterized in that, the drive singal of described LDO drive circuit exports the base stage of described PNP pipe to.
6. the DC voltage converter according to any one of claim 1-5, is characterized in that, described gate control circuit is according to V
outload come in BUCK type DCDC drive circuit described in gating and described LDO drive circuit one.
7. DC voltage converter as claimed in claim 6, is characterized in that:
As described V
outload when being greater than predetermined threshold, gating BUCK type DCDC drive circuit; And
As described V
outload when being less than predetermined threshold, gating LDO drive circuit.
8. DC voltage converter as claimed in claim 7, it is characterized in that, described predetermined threshold is 100uA.
9. DC voltage converter as claimed in claim 6, it is characterized in that, described gate control circuit monitors the charging ON time of described switch element to determine V
outload.
10. DC voltage converter as claimed in claim 6, it is characterized in that, described gate control circuit is monitored to the charging current of described electric capacity to determine V
outload.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738857.9A CN104753344A (en) | 2013-12-27 | 2013-12-27 | Technology for reducing BUCK static current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738857.9A CN104753344A (en) | 2013-12-27 | 2013-12-27 | Technology for reducing BUCK static current |
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| CN104753344A true CN104753344A (en) | 2015-07-01 |
Family
ID=53592580
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310738857.9A Pending CN104753344A (en) | 2013-12-27 | 2013-12-27 | Technology for reducing BUCK static current |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762892A (en) * | 2016-04-28 | 2016-07-13 | 西安航天民芯科技有限公司 | Step-down output and charging and discharging protection system for lithium battery |
| CN106026647A (en) * | 2016-04-29 | 2016-10-12 | 深圳市华芯邦科技有限公司 | Hybrid circuit DC electric energy buck conversion device |
| CN106787718A (en) * | 2015-11-20 | 2017-05-31 | 德克萨斯仪器股份有限公司 | Inductor is detected |
| WO2021021574A1 (en) * | 2019-07-29 | 2021-02-04 | Micron Technology, Inc. | Capacitor-based power converter |
| CN116742954A (en) * | 2022-09-29 | 2023-09-12 | 荣耀终端有限公司 | Power supply switching circuit and electronic equipment |
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| EP1681760A2 (en) * | 2005-01-18 | 2006-07-19 | Micrel, Inc. | Dual mode buck regulator with improved transition between LDO and PWM operation |
| CN101252316A (en) * | 2007-02-22 | 2008-08-27 | 株式会社理光 | Switching regulator |
| CN103135648A (en) * | 2013-03-20 | 2013-06-05 | 电子科技大学 | Low dropout regulator |
| CN104702101A (en) * | 2013-12-10 | 2015-06-10 | 展讯通信（上海）有限公司 | Voltage conversion device and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1681760A2 (en) * | 2005-01-18 | 2006-07-19 | Micrel, Inc. | Dual mode buck regulator with improved transition between LDO and PWM operation |
| US7064531B1 (en) * | 2005-03-31 | 2006-06-20 | Micrel, Inc. | PWM buck regulator with LDO standby mode |
| CN101252316A (en) * | 2007-02-22 | 2008-08-27 | 株式会社理光 | Switching regulator |
| CN103135648A (en) * | 2013-03-20 | 2013-06-05 | 电子科技大学 | Low dropout regulator |
| CN104702101A (en) * | 2013-12-10 | 2015-06-10 | 展讯通信（上海）有限公司 | Voltage conversion device and electronic device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787718A (en) * | 2015-11-20 | 2017-05-31 | 德克萨斯仪器股份有限公司 | Inductor is detected |
| US10534387B2 (en) | 2015-11-20 | 2020-01-14 | Texas Instruments Incorporated | Circuit and method for power control |
| CN106787718B (en) * | 2015-11-20 | 2021-05-25 | 德克萨斯仪器股份有限公司 | Inductor detection |
| US11256276B2 (en) | 2015-11-20 | 2022-02-22 | Texas Instruments Incorporated | Inductor detection |
| US11940826B2 (en) | 2015-11-20 | 2024-03-26 | Texas Instruments Incorporated | Inductor detection |
| CN105762892A (en) * | 2016-04-28 | 2016-07-13 | 西安航天民芯科技有限公司 | Step-down output and charging and discharging protection system for lithium battery |
| CN105762892B (en) * | 2016-04-28 | 2018-05-22 | 西安航天民芯科技有限公司 | A kind of lithium battery reduced output voltage and charge and discharge protecting system |
| CN106026647A (en) * | 2016-04-29 | 2016-10-12 | 深圳市华芯邦科技有限公司 | Hybrid circuit DC electric energy buck conversion device |
| WO2021021574A1 (en) * | 2019-07-29 | 2021-02-04 | Micron Technology, Inc. | Capacitor-based power converter |
| US11073855B2 (en) | 2019-07-29 | 2021-07-27 | Micron Technology, Inc. | Capacitor-based power converter with buck converter |
| CN114402518A (en) * | 2019-07-29 | 2022-04-26 | 美光科技公司 | Capacitor-based power converter |
| CN116742954A (en) * | 2022-09-29 | 2023-09-12 | 荣耀终端有限公司 | Power supply switching circuit and electronic equipment |
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Application publication date: 20150701 |