CN102005919B - Boost DC-DC (Direct Current-Direct Current) converter and method - Google Patents
Boost DC-DC (Direct Current-Direct Current) converter and method Download PDFInfo
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Abstract
The invention relates to the field of electrics and provides a boost DC-DC (Direct Current-Direct Current) converter and a method in order to solve the problems of overlarge dimension and long starting time of the converter in the prior art. The device comprises a clock conversion unit, a multi-path power supply driving unit and a circuit control unit, wherein the clock conversion unit is used for driving a power switch unit at the starting stage; the multi-path power supply driving unit is used for detecting whether VOUT (output voltage) reaches a first preset value or not; if the VOUT reaches the first preset value, the VOUT is selected and output to serve as the power supply voltage of the power switch unit, otherwise, VIN (input voltage) is selected and output to serve as the power supply voltage of the power switch unit; and the circuit control unit is used for judging whether the VOUT reaches a second preset value or not; if the VOUT reaches the second preset value, the clock conversion unit is shut off; and the power switch unit is driven by the circuit control unit to continue to boost and keep the VOUT to a third preset value. The embodiment of the invention has the advantages that the circuit dimension of the DC-DC converter can be reduced, and the starting time under the low input voltage is shortened.
Description
Technical field
The present invention relates to electricity field, particularly a kind of step-up DC-DC transducer and method.
Background technology
Along with being rooted in the hearts of the people of the theory of energy-conserving and environment-protective, to the use of solar-energy photo-voltaic cell gradually obtain the general approval of society.But it is infeasible that faint solar-energy photo-voltaic cell (0.3～0.5V) is directly offered to present portable product, so the use of (Boost) type DC-to-DC (DC-DC) transducer that boosts will be inevitable.
Be illustrated in figure 1 a kind of Boost type DC-DC converter structure block diagram of the prior art.Startup stage, the clock signal of oscillator (OSC) output direct driving power device NMOS1 through driver 1 (BUF1) after, reaches the object of startup and lifting output voltage VO UT.But low voltage power supply equipment, for example, when solar-energy photo-voltaic cell (0.3～0.5V) is as power supply VIN, VIN level underswing is with driving power device NMOS1 (threshold voltage is at 0.7～0.9V conventionally).Like this, start the electric current that starting stage input power VIN flows through inductance (L) and diode (D), finally make Vout a little less than VIN, because Vout is less than transistor threshold voltage VTH, now step-up DC-DC change-over circuit cannot be realized the switch motion of charging-electric discharge, Vout cannot promote, and causes starting unsuccessfully.Therefore the Boost type DC-DC transducer of Fig. 1 cannot meet the demand that low-voltage starts.
2～3 solar-energy photo-voltaic cells even if connect, make output voltage reach 1V left and right, and Fig. 1 also has its not foot point: toggle speed is slow.Because under normal conditions because power device NMOS1 only startup stage use, for the width/length (W/L) of consumed power device NMOS1 that reduces chip area is than little a lot of with respect to NMOS2.The conducting resistance of little W/L power device has consumed most energy when starting, and has caused the energy that passes to output capacitance to diminish, and need to be so just that output capacitance transmits energy through the more cycle, and then toggle speed is slack-off.And in circuit, use two power devices simultaneously, and also having occupied quite a few area, manufacturing cost is higher.
In US Patent No. 6351073B1, disclose a kind of boost converter, as shown in Figure 2, this is a self-powered DC-DC Switching Power Supply voltage up converting circuit.Circuit comprises 32, one control circuits 36 of 26, one output capacitances of 30, one switches of 24, one diodes of an inductor, and the main boosting converter system of being responsible for of this control circuit 36 is controlled.An outside IGNITER module 38, for power supply being provided within the limited time control circuit 36, reaches the object that starts VOUT.When IGNITER circuit 38 provides power supply for control circuit 36, VOUT also constantly rises, and IGNITER circuit 38 stops rear control circuit 36 provides power supply by VOUT, continues to promote VOUT voltage, until VOUT reaches rated value, boost conversion system has started.Now, system can be operated under single battery voltage or the low power supply of the direct current of 0.3V under.
In above-mentioned prior art, starting drive is an IGNITER circuit outside boost converter.28 positions in figure and IGNITER circuit 36 are directly coupled together, in the process that VOUT rises, can there is VOUT to the possibility of IGNITER circuit 36 electric leakages, if VOUT voltage surpasses the maximum operating voltage of IGNITER circuit 36, for IGNITER circuit 36, there is risk so.
Summary of the invention
The embodiment of the present invention provides a kind of step-up DC-DC transducer and method, for solving prior art transducer, need selection input supply voltage VIN that a plurality of high power switchs cause or output voltage VO UT as the problem of supply voltage, and then the higher problem of the solution oversize energy consumption causing of transducer, while solving low voltage starting simultaneously, the problem that start-up time is excessively slow.
The embodiment of the present invention has proposed a kind of step-up DC-DC transducer, comprising:
Clock converter unit, for directly driving the power switch unit that is output as power supply with multiple power supplies driver element described step-up DC-DC transducer startup stage;
Described multiple power supplies driver element, whether the output voltage VO UT for detection of described step-up DC-DC transducer arrives the first predetermined value, if reach described the first predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise selection output-input voltage VIN are as the supply voltage of power switch unit;
Circuit control unit, be used for judging whether described output voltage VO UT arrives the second predetermined value, if arrive described the second predetermined value, turn-off described clock converter unit, by described circuit control unit, driven conducting or the shutoff of described power switch unit, continue to promote and maintain described output voltage VO UT to the three predetermined values;
Described power switch unit, for receiving above-mentioned driving signal, and the turn-on and turn-off of power ratio control switch, export and maintain described output voltage VO UT.
According to the transducer described in the embodiment of the present invention further aspect, described clock converter unit comprises: clock generation module, for according to the pulse of described input supply voltage VIN generated clock; Level shift module, for the level of the supply voltage that is described power switch unit by the level conversion of described clock pulse.
According to another further aspect of the transducer described in the embodiment of the present invention, described multiple power supplies driver element also comprises: voltage detection module, a PMOS switch module, the 2nd PMOS switch module; Described voltage detection module, for receiving the output voltage VO UT of described step-up DC-DC transducer, according to the relation of described output voltage VO UT and the first predetermined value, control respectively conducting or the shutoff of a described PMOS switch module and the 2nd PMOS switch module; The substrate of a described PMOS switch module is connected described input supply voltage VIN with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that drain electrode is connected to multiple power supplies driver element is to export described input supply voltage VIN; The substrate of described the 2nd PMOS switch module is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that multiple power supplies driver element is received in drain electrode is to export described output voltage VO UT.
According to another further aspect of the transducer described in the embodiment of the present invention, described multiple power supplies driver element also comprises: voltage detection module, a PMOS switch module, the 2nd PMOS switch module; Described voltage detection module, for receiving the output voltage VO UT of described step-up DC-DC transducer, according to the relation of described output voltage VO UT and the first predetermined value, control respectively conducting or the shutoff of a described PMOS switch module and the 2nd PMOS switch module; The source electrode of a described PMOS switch module connects described input supply voltage VIN, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that drain electrode and substrate are connected to multiple power supplies driver element is to export described input supply voltage VIN; Described the 2nd PMOS switch module substrate is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that multiple power supplies driver element is received in drain electrode is to export described output voltage VO UT.
Another further aspect according to the transducer described in the embodiment of the present invention, also comprises boosting unit, for promoting input supply voltage VIN to the input of described multiple power supplies driver element.
According to another further aspect of the transducer described in the embodiment of the present invention, the input supply voltage VCP1 after described boosting unit output is controlled voltage VCP2 and is raised.
According to another further aspect of the transducer described in the embodiment of the present invention, the source electrode of a described PMOS switch module connects described input supply voltage VIN, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that drain electrode and substrate are connected to multiple power supplies driver element is to export described input supply voltage VIN;
Described the 2nd PMOS switch module substrate is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that multiple power supplies driver element is received in drain electrode is to export described output voltage VO UT.
According to another further aspect of the transducer described in the embodiment of the present invention, described multiple power supplies driver element comprises a PMOS switch module, the 2nd PMOS switch module and nmos pass transistor; The drain electrode of a described PMOS switch module connects the output of described multiple power supplies driver element, and substrate is connected the drain electrode of described nmos pass transistor with source electrode; The drain electrode of described the 2nd PMOS switch module connects described output voltage VO UT, and substrate is connected the output of described multiple power supplies driver element with source electrode; The source electrode of described nmos pass transistor with described in input supply voltage VCP1 after being raised be connected, grid is connected with the control voltage VCP2 of described boosting unit output, and meets input supply voltage VCP1 after described control voltage VCP2 is raised described in being greater than and the threshold V T H sum of described nmos pass transistor.
The embodiment of the present invention also provides a kind of step-up DC-DC conversion method in order to solve above-mentioned existing issue, comprise: startup stage utilize multiple power supplies driver element output VIN, and as power switch unit supply voltage, clock converter unit driving power switch element is to form the output voltage VO UT of step-up DC-DC transducer; Detect described output voltage VO UT and whether arrive the first predetermined value, if reach described the first predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise selection output-input voltage VIN are as the supply voltage of power switch unit; When described output voltage V
When OUT is progressively increased to the second predetermined value, by circuit control unit, driven conducting or the shutoff of described power switch unit, continue to promote and maintain described output voltage VO UT to the three predetermined values.
According to the method for the invention further aspect, startup stage utilize multiple power supplies driver element output VIN, and as power switch unit supply voltage, in the output voltage VO UT of clock converter unit driving power switch element with formation step-up DC-DC transducer, also comprise, utilize described input supply voltage VIN to produce clock pulse, the level of the supply voltage that is described power switch unit by the level conversion of described clock pulse.
According to another further aspect of the method for the invention, in detection, whether described output voltage VO UT arrives the first predetermined value, if reach described predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise in selection the supply voltage of output-input voltage VIN as power switch unit, when described output voltage VO UT is less than the first predetermined value, conducting the one PMOS switch module, and turn-off the 2nd PMOS switch module, select and export described input supply voltage VIN; When described output voltage VO UT is greater than the first predetermined value, the 2nd PMOS switch module described in conducting, and turn-off a described PMOS switch module, select and export described output voltage VO UT.
According to another further aspect of the method for the invention, startup stage utilize multiple power supplies driver element output VIN, and as power switch unit supply voltage, clock converter unit driving power switch element is to form in the output voltage VO UT of step-up DC-DC transducer, also comprise described input supply voltage VIN is boosted, the voltage after utilizing this to boost is as the input of multiple power supplies driver element.
The embodiment of the present invention can select input supply voltage VIN or output voltage VO UT as the supply voltage of power switch unit by multiple power supplies driver element, can reduce the size of DC-DC converter circuit size, and by boosting unit, can to utilizing, such as low-voltage sources such as solar cells, the power consumption equipment as power supply starts fast.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Figure 1 shows that a kind of Boost type DC-DC converter structure block diagram of the prior art;
Figure 2 shows that self-powered DC-DC Switching Power Supply voltage up converting circuit in prior art;
Figure 3 shows that a kind of step-up DC-DC of embodiment of the present invention converter structure schematic diagram;
Figure 4 shows that a kind of step-up DC-DC of embodiment of the present invention conversion method flow chart;
Figure 5 shows that another structural representation of a kind of step-up DC-DC of embodiment of the present invention transducer;
Figure 6 shows that another structural representation of a kind of step-up DC-DC of embodiment of the present invention transducer;
Figure 7 shows that the structural representation of embodiment of the present invention clock converter unit;
Figure 8 shows that embodiment of the present invention clock signal OSC obtains through level shift module converts the OSCL signal graph that relative level is higher;
Fig. 9 a to Fig. 9 c is depicted as the structural representation of embodiment of the present invention multiple power supplies driver element;
Figure 10 shows that embodiment of the present invention step-up DC-DC transducer design sketch.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Be illustrated in figure 3 a kind of step-up DC-DC of embodiment of the present invention converter structure schematic diagram.
Comprise clock converter unit 301, multiple power supplies driver element 302, circuit control unit 303, power switch unit 304.
Wherein, described clock converter unit 301, for directly driving the power switch unit 304 that is output as power supply with multiple power supplies driver element described step-up DC-DC transducer startup stage.
Described multiple power supplies driver element 302, whether the output voltage VO UT for detection of described step-up DC-DC transducer arrives the first predetermined value, if reach described the first predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit 304, otherwise selection output-input voltage VIN are as the supply voltage of power switch unit 304.
Described circuit control unit 303, for controlling conducting or the shutoff of described power switch unit 304, if and the described output voltage VO UT of judgement turn-offs described clock converter unit 301 while arriving the second predetermined value, drive described power switch unit 304 to continue to promote and maintain described output voltage VO UT to the three predetermined values by described circuit control unit 303.
Described power switch unit 304, for receiving driving signal, and the turn-on and turn-off of power ratio control switch, export and maintain described output voltage VO UT.
As one embodiment of the present of invention, described clock converter unit 301 comprises, clock generation module and level shift module, and described clock generation module is used for according to the pulse of described input supply voltage generated clock; It is the level of the supply voltage of described power switch unit 304 by the level conversion of described clock pulse that described level shift module is used for.
As one embodiment of the present of invention, described multiple power supplies driver element 302 also comprises, voltage detection module, the one PMOS switch module, the 2nd PMOS switch module, described voltage detection module receives the output voltage VO UT of described step-up DC-DC transducer, controls respectively conducting or the shutoff of a described PMOS switch module and the 2nd PMOS switch module according to the relation of output voltage VO UT and the first predetermined value; The substrate of a described PMOS switch module is connected described input supply voltage VIN with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, drain electrode is connected to the output of multiple power supplies driver element, to export described input supply voltage VIN; The substrate of described the 2nd PMOS switch module is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output of multiple power supplies driver element is received in drain electrode, to export described output voltage VO UT.
The relation of described output voltage VO UT and the first predetermined value can be: when described output voltage VO UT is less than the first predetermined value, a PMOS switch module described in conducting, and turn-off described the 2nd PMOS switch module, export described input supply voltage VIN as the output voltage of multiple power supplies driver element 302, when described output voltage VO UT is greater than the first predetermined value, the 2nd PMOS switch module described in conducting, and turn-off a described PMOS switch module, export described output voltage VO UT as the output voltage of multiple power supplies driver element 302.
As one embodiment of the present of invention, also comprise boosting unit, for promoting the input supply voltage VIN that is input to described multiple power supplies driver element 302, this boosting unit can adopt charge pump etc., thereby realize input supply voltage VIN, can be lower voltage, such as solar cell etc.
As one embodiment of the present of invention, the input supply voltage VCP1 after described boosting unit output is controlled voltage VCP2 and is raised.
As one embodiment of the present of invention, the substrate that a described PMOS switch module substrate is connected to described output VX and the 2nd PMOS switch module is connected to described output voltage VO UT.
As one embodiment of the present of invention, multiple power supplies driver element 302 also comprises nmos pass transistor, and the drain electrode of a described PMOS switch module connects the output of described multiple power supplies driver element, and substrate is connected the drain electrode of described nmos pass transistor with source electrode; The drain electrode of described the 2nd PMOS switch module connects described output voltage VO UT, and substrate is connected the output of described multiple power supplies driver element with source electrode; The source electrode of described nmos pass transistor with described in input supply voltage VCP1 after being raised be connected, grid is connected with the control voltage VCP2 of described boosting unit output, and meets input supply voltage VCP1 after described control voltage VCP2 is raised described in being greater than and the threshold V T H sum of described nmos pass transistor; Described voltage detection module is when described output voltage VO UT is less than the first predetermined value, a PMOS switch module described in conducting, and turn-off described the 2nd PMOS switch module, export described input supply voltage VIN as the output voltage of multiple power supplies driver element 302, when described output voltage VO UT is greater than the first predetermined value, the 2nd PMOS switch module described in conducting, and turn-off a described PMOS switch module, export described output voltage VO UT as the output voltage of multiple power supplies driver element 302.
Pass through above-described embodiment, by multiple power supplies driver element, select input supply voltage VIN or output voltage VO UT as the supply voltage of power switch unit, can reduce the size of DC-DC converter circuit size, and by boosting unit, can to utilizing, such as low-voltage sources such as solar cells, the power consumption equipment as power supply starts fast.
Be illustrated in figure 4 a kind of step-up DC-DC of embodiment of the present invention conversion method flow chart.
Comprise, step 401, startup stage utilize multiple power supplies driver element output VIN, using described VIN as power switch unit supply voltage, clock converter unit driving power switch element is to form the output voltage VO UT of step-up DC-DC transducer.
Step 402, detect described output voltage VO UT and whether arrive the first predetermined value, if reach described predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise selection output-input voltage VIN are as the supply voltage of power switch unit.
Step 403, when described output voltage VO UT is progressively increased to the second predetermined value, drives described power switch unit by circuit control unit, continues to promote and maintain described output voltage VO UT to the three predetermined values.
As one embodiment of the present of invention, in step 401, utilize described input supply voltage VIN to produce clock pulse, the level of the supply voltage that is described power switch unit by the level conversion of described clock pulse.
As one embodiment of the present of invention, in step 402, when described output voltage VO UT is less than the first predetermined value, conducting the one PMOS switch module, and turn-off the 2nd PMOS switch module, select and export described input supply voltage VIN, when described output voltage VO UT is greater than the first predetermined value, the 2nd PMOS switch module described in conducting, and turn-off a described PMOS switch module, select and export described output voltage VO UT.
As one embodiment of the present of invention, in step 401, also comprise described input supply voltage VIN is boosted, the voltage after utilizing this to boost is as the input voltage of described multiple power supplies driver element.
Pass through above-described embodiment, by selecting input supply voltage VIN or output voltage VO UT as the driving power of power switch unit, can reduce the size of DC-DC converter circuit size, and after VIN is boosted, can be to utilizing the quick object starting of power consumption equipment as power supply such as LVPS such as solar cells.
Be illustrated in figure 5 another structural representation of a kind of step-up DC-DC of embodiment of the present invention transducer.
Comprise in the present embodiment clock converter unit 501, multiple power supplies driver element 502, power switch unit 503, circuit control unit 504.
Described clock converter unit 501 comprises clock generating module 5011, level shift module 5012.
Described multiple power supplies driver element 502 comprises voltage detection module 5021, and power supply is selected module 5022.
Described power switch unit 503 comprises inductor 5031, Schottky diode 5032, NMOS power device 5033, output capacitor 5034, feedback resistance 5035, NOR gate 5036, driver 5037.
The output voltage VO UT of the boost DC-DC converter of the present embodiment is connected to input supply voltage VIN by inductor 5031 and Schottky diode 5032.The forward end of described Schottky diode 5032 is connected to described inductor 5031, and negative phase end is connected to the output voltage VO UT of described boost DC-DC converter.The source electrode of described NMOS power device 5033 and substrate ground connection, drain electrode is connected to the forward end of Schottky diode 5032.Input supply voltage VIN and output voltage VO UT that described multiple power supplies driver element 502 connects described boost DC-DC converter arrive its two input, by voltage detection module 5021, detect described output voltage VO UT, through power supply, select module 5022 using voltage higher in VIN, VOUT voltage as output end voltage VX, provide three electronic circuits to connect: driver 5037, the level shift module 5012 in NOR gate 5036 and described clock converter unit 501.Driver 5037 outputs are connected to the grid of NMOS power device 5033.The output OSCL of described clock converter unit 501 be connected in described power switch unit 503 NOR gate 5036.Wherein the output CTRL signal of circuit control unit 504 be also connected in described power switch unit 503 NOR gate 5036, and its output STOP signal is connected to the clock generating module 5011 in described clock converter unit 501.
The described boost DC-DC converter course of work is as follows: the clock generating module 5011 in described clock converter unit 501 is sent clock signal OSC, the level of this clock signal is input supply voltage VIN, whether the output voltage VO UT that the voltage detection module in multiple power supplies driver element 502 5021 detects boost DC-DC converter simultaneously arrives the first predetermined value, power supply selects module 5022 according to testing result, VIN or VOUT to be selected, for example, when being greater than the first predetermined value (being 1.2V), output voltage VO UT exports described output voltage VO UT, when output voltage VO UT is less than described the first predetermined value, export input power VIN, here VIN or the VOUT of output are all designated as voltage VX.VX offers the level shift module 5012 in described clock converter unit 501 as internal electric source, its VIN level by osc signal is converted into internal power level VX, the OSCL signal producing is connected to the NOR gate 5036 in described power switch unit 503, pass through again driver 5037 rear drive NMOS power devices 5033, turn-on and turn-off by power device 5033 by the stored energy of input supply voltage VIN on inductor 5031, after Schottky diode 5032, be delivered to again in output capacitance 5034 output VOUT voltage.The feedback signal (FB) that feedback resistance 5035 produces sends described circuit control unit 504 to, this circuit control unit 504 detects described output voltage VO UT and for example rises to, after the second predetermined value (1.6V), described circuit control unit 504 produces STOP signal and stops described clock converter unit 501, produce the NOR gate 5036 of CTRL signal by described power switch unit 503 simultaneously and be connected in driver 5037 to drive conducting NMOS power device 5033, and then by negative feedback, VOUT is for example stabilized in, near the 3rd predetermined value (2.0V).
For example, when input voltage is about 1.0V, startup stage output voltage VO UT be 0V, VIN is through clock generating module 5011, becoming level is the square-wave signal OSC of 1.0V left and right, the voltage detection module 5021 of multiple power supplies driver element 502 now detects VOUT, when VOUT is less than the first predetermined value, by power supply, select module 5022 output VIN as output voltage V X, the voltage level that described level shift module 5012 is VX by the level conversion of described osc signal (being the voltage level of VIN), form OSCL signal, this OSCL signal is sent to the NOR gate 5036 of power switch unit 503, due to VOUT rising now, do not reach the second predetermined value, so circuit control unit 504 does not start, NOR gate 5036 sends described OSCL signal to driver 5037, this driver 5037 is according to NMOS power device 5033 described in OSCL signal conduction, realize output voltage VO UT, continuous lifting along with VOUT, when VOUT is greater than the first predetermined value, the power supply of multiple power supplies driver element 502 selects module 5022 output VOUT as output voltage V X, the voltage that described level shift module 5012 is VX by the voltage transitions of described osc signal (being the voltage of VOUT), form OSCL signal, this OSCL signal is sent to the NOR gate 5036 of power switch unit 503, when if VOUT now does not reach the second predetermined value, circuit control unit 504 does not start, when if VOUT now reaches the second predetermined value, circuit control unit 504 starts, to clock converter unit 501, send stop signal, stop described clock converter unit 501 work, now OSCL signal is 0V, by circuit control unit 504, export CTRL signals to NOR gate 5036, NOR gate 5036 sends described CTRL signal to driver 5037, this driver 5037 is according to NMOS power device 5033 described in CTRL signal driver, realize and progressively improve output voltage VO UT to the three predetermined values.Conventionally, the first predetermined value is less than the second predetermined value, and the second predetermined value is less than the 3rd predetermined value.
Be illustrated in figure 6 another structural representation of a kind of step-up DC-DC of embodiment of the present invention transducer.
The present embodiment, to embodiment illustrated in fig. 5 substantially similar, is described difference at this, and something in common repeats no more.
In this example, between input supply voltage VIN and multiple power supplies driver element 502, also comprise a boosting unit 505, this boosting unit 505 can be charge pump, is understandable that, the embodiment of the present invention can also adopt other increasing apparatus, at this, does not limit.
This boosting unit 505 boosts for input supply voltage VIN's, for example, the voltage of the 0.3V to 0.5V of solar cell is risen to 1.2V.Thereby the boost DC-DC converter that can make the embodiment of the present invention is applicable to lower input supply voltage.
Described clock converter unit 501 is connected to input supply voltage VIN, and the clock signal OSC that clock generating module 5011 produces is connected to level shift module 5012 and boosting unit 505.The output OSCL of described clock converter unit 501 is connected to the NOR gate 5036 in described power switch unit 503.The output CTRL signal of described circuit controller 504 is connected to the NOR gate 5036 in described power switch unit 503, and its output STOP signal is connected to the clock generating module 5011 in described clock converter unit 501.
The described boost DC-DC converter course of work is as follows: the clock generating module 5011 in described clock converter unit 501 is sent clock signal OSC, delivers in described boosting unit 505 simultaneously.Described boosting unit 505 tentatively boosts input supply voltage VIN, and it is output as VCP, and like this with respect to common boost DC-DC converter, input supply voltage VIN can be applied under lower voltage conditions.Voltage detection module in multiple power supplies driver element 502 5021 detects output voltage VO UT simultaneously, by power supply, select in the output VCP of module 5022 output boosting units 505 or output voltage VO UT, its selection course is as described in Fig. 5 embodiment, and the VIN of output or VOUT are all designated as voltage VX.VX offers the level shift module 5012 in described clock converter unit 501 as internal electric source, the level VIN of osc signal is converted into VX, the OSCL signal producing is connected to the NOR gate 5036 in described power switch unit 503, then passes through driver 5037 rear drive NMOS power devices 5033.By the turn-on and turn-off of NMOS power device 5033, the energy of storage on inductor 5031 is delivered on output capacitor 5034 after Schottky diode 5032, the feedback signal FB indicating circuit control unit 504 output voltage VO UT that produce when feedback resistance 5035 rise to after the second predetermined value, described circuit control unit 504 produces STOP signal and stops described clock converter unit 501, the CTRL signal of its generation is simultaneously connected in driver 5037 by the NOR gate 5036 in described power switch unit 503, by negative feedback, output voltage VO UT further improved and maintain near the 3rd predetermined value.
Be illustrated in figure 7 the structural representation of embodiment of the present invention clock converter unit.
Comprise clock generating module 5011, level shift module 5012.
Because the VX of multiple power supplies driver element 502 outputs is supply voltages of power switch unit, so clock signal OSC is converted to through level shift module 5012 the OSCL signal that relative level is higher, as shown in Figure 8.
As Fig. 9 a to Fig. 9 c is depicted as the structural representation of embodiment of the present invention multiple power supplies driver element.
In Fig. 9 a, it is Vx that two transistorized drain electrodes of PMOS are all connected in output figure, the substrate of the one PMOS transistor 901 is connected VIN (as optional embodiment with source electrode, also can be for connecting the VCP of boosting unit output, now input voltage is VCP), the substrate of second PMOS transistor 902 is connected VOUT with source electrode.The grid of two PMOS is controlled by voltage detection module 903.When output voltage VO UT is less than the first predetermined value, the grid that voltage detection module 903 is controlled a PMOS transistor 901 is " 0 ", the output end voltage VX using VIN as this multiple power supplies driver element.And the grid of the 2nd PMOS transistor 902 is set to " 1 " simultaneously, turn-off the 2nd PMOS transistor 902.Once VOUT, be greater than the first predetermined value, voltage detection unit 903 is set to " 1 " by the grid of a PMOS transistor 901, turn-off a PMOS transistor 901, and the grid of the 2nd PMOS transistor 902 is set to " 0 " simultaneously, conducting the 2nd PMOS transistor 902, output end voltage VX using VOUT as this multiple power supplies driver element, the selection that realizes power supply is switched.As can be seen from the figure the parasitic diode of the 2nd PMOS transistor 902 is when turn-offing, and still to VOUT leakage current, this is unfavorable for the rising of VX internal electric source.Equally, the parasitic body diode of a PMOS transistor 901, when it turn-offs, still to VIN leakage current, is also unfavorable for the rising of VX internal electric source.
In Fig. 9 b, the substrate annexation of pair pmos transistor is adjusted, the substrate of the one PMOS transistor 901 and drain electrode are all connected to (being output end voltage VX position) on output, source electrode connects described input supply voltage VIN, grid is accepted described voltage detection module, it is upper that the 2nd PMOS transistor 902 substrates and source electrode are connected to output voltage VO UT, and grid connects described voltage detection module by an inverter, and drain electrode is received output to export described output voltage VO UT.When input supply voltage VIN charges to output end voltage VX, the threshold voltage of a PMOS transistor 901 above reduces because substrate is connected to low-voltage VX.When turn-offing a PMOS transistor 901, the parasitic diode of substrate is anti-inclined to one side simultaneously, thereby output end voltage VX does not have leakage current by a PMOS transistor 901.But the as can be seen from the figure parasitic diode of the 2nd PMOS transistor 902 positively biased and to VOUT leakage current, this is unfavorable for the rising of yX internal electric source when turn-offing.
In Fig. 9 c, utilize three transistors to realize the selection of power supply VCP1 and VOUT.The drain electrode of the one PMOS transistor 901 connects output end voltage VX, and its substrate is connected the drain electrode of nmos pass transistor 904 with source electrode.The substrate ground connection of nmos pass transistor 904, source electrode connects VCP1, and wherein said VCP1 is input supply voltage VIN or the VIN after boosting.The drain electrode of the 2nd PMOS transistor 902 connects VOUT, and the substrate of a PMOS transistor 901 is connected output end voltage VX with source electrode.The grid of two PMOS is controlled by voltage detection unit 903, and the grid of nmos pass transistor 904 is the output voltage V CP2 of boosting unit (boosting unit has two output VCP1 and VCP2 conventionally, and the value of output voltage can be set according to actual needs).Boost DC-DC converter startup stage, when output voltage VO UT is less than the first predetermined value, meets VCP2 > VCP1+VTH4 (VTH4 is the threshold voltage of nmos pass transistor 904) and guarantee nmos pass transistor 904 conducting always.Meanwhile, voltage detection module 903 is set to " 0 " by the grid of a PMOS transistor 901, and the voltage of VCP1 is passed to output end voltage VX.And the grid of the 2nd PMOS transistor 902 is set to " 1 " simultaneously, turn-off the 2nd PMOS transistor 902.Once VOUT, be greater than the first predetermined value, boosting unit quits work, and nmos pass transistor 904 turn-offs.Voltage detection module 903 is also set to " 1 " by the grid of a PMOS transistor 901, turn-off a PMOS transistor 901, and the grid of the 2nd PMOS transistor 902 is set to " 0 " simultaneously, conducting the 2nd PMOS transistor 902, VOUT will be passed to output end voltage VX, and the selection that realizes power supply is switched.As can be seen from the figure the parasitic body diode of a PMOS transistor 901 and nmos pass transistor 904, when it turn-offs, does not have leakage current from VX to VCP1.Meanwhile, the 2nd PMOS transistor 902 has the leakage current of VOUT by the parasitic body diode of the 2nd PMOS transistor 902 when turn-offing, and has accelerated the foundation of internal electric source VX, and has not had the leakage current from VX to VOUT.
Be embodiment of the present invention step-up DC-DC transducer design sketch as shown in figure 10.
As shown in figure 10, after VIN powers on, clock signal OSC produces at once, and the VCP voltage of VIN after boosting also generates immediately simultaneously, and multiple power supplies driver produces VX.Now, because the level shift module in described clock converter converts osc signal to the OSCL signal of power switch unit power level, directly driving power switch element, constantly rises VOUT voltage.When VOUT voltage reaches the second predetermined value, circuit controller sends STOP signal, closes clock converter, stops VIN and boosts.Its CTRL signal continues driving power switch element.Now, VOUT voltage also reaches the first predetermined value, so VX switches to VOUT.Until VOUT reaches the 3rd predetermined value.In figure, expressed on the point of each conversion the situation of change of each voltage.
Beneficial effect of the present invention is, by selecting input supply voltage VIN or output voltage VO UT as the supply voltage of power switch unit, can reduce the size of DC-DC converter circuit size, and after VIN is boosted, can to utilizing, such as low-voltage sources such as solar cells, the power consumption equipment as power supply starts fast.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. step-up DC-DC transducer, is characterized in that comprising:
Clock converter unit, for directly driving a power switch unit that is output as power supply with multiple power supplies driver element described step-up DC-DC transducer startup stage;
Described multiple power supplies driver element, whether the output voltage VO UT for detection of described step-up DC-DC transducer arrives the first predetermined value, if reach described the first predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise select and export input supply voltage VIN as the supply voltage of power switch unit;
Circuit control unit, be used for judging whether described output voltage VO UT arrives the second predetermined value, if arrive described the second predetermined value, turn-off described clock converter unit, by described circuit control unit, driven conducting or the shutoff of described power switch unit, continue to promote and maintain described output voltage VO UT to the three predetermined values;
A described power switch unit, for receiving driving signal, and the turn-on and turn-off of power ratio control switch, export and maintain described output voltage VO UT.
2. transducer according to claim 1, is characterized in that, described clock converter unit comprises:
Clock generation module, for according to the pulse of described input supply voltage VIN generated clock;
Level shift module, for the level of the supply voltage that is described power switch unit by the level conversion of described clock pulse.
3. transducer according to claim 1, is characterized in that, described multiple power supplies driver element also comprises: voltage detection module, a PMOS switch module, the 2nd PMOS switch module;
Described voltage detection module, for receiving the output voltage VO UT of described step-up DC-DC transducer, according to the relation of described output voltage VO UT and the first predetermined value, control respectively conducting or the shutoff of a described PMOS switch module and the 2nd PMOS switch module;
The substrate of a described PMOS switch module is connected described input supply voltage VIN with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that drain electrode is connected to multiple power supplies driver element is to export described input supply voltage VIN;
The substrate of described the 2nd PMOS switch module is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that multiple power supplies driver element is received in drain electrode is to export described output voltage VO UT.
4. transducer according to claim 1, is characterized in that, described multiple power supplies driver element also comprises: voltage detection module, a PMOS switch module, the 2nd PMOS switch module;
Described voltage detection module, for receiving the output voltage VO UT of described step-up DC-DC transducer, according to the relation of described output voltage VO UT and the first predetermined value, control respectively conducting or the shutoff of a described PMOS switch module and the 2nd PMOS switch module;
The source electrode of a described PMOS switch module connects described input supply voltage VIN, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that drain electrode and substrate are connected to multiple power supplies driver element is to export described input supply voltage VIN;
Described the 2nd PMOS switch module substrate is connected described output voltage VO UT with source electrode, grid is accepted control conducting or the shutoff of described voltage detection module, and the output that multiple power supplies driver element is received in drain electrode is to export described output voltage VO UT.
5. transducer according to claim 1, is characterized in that, also comprises boosting unit, for promoting input supply voltage VIN to the input of described multiple power supplies driver element.
6. transducer according to claim 5, is characterized in that, the input supply voltage VCP1 after described boosting unit output is controlled voltage VCP2 and is raised.
7. transducer according to claim 6, is characterized in that, described multiple power supplies driver element comprises a PMOS switch module, the 2nd PMOS switch module and nmos pass transistor;
The drain electrode of a described PMOS switch module connects the output of multiple power supplies driver element, and substrate is connected the drain electrode of described nmos pass transistor with source electrode, and grid is accepted control conducting or the shutoff of voltage detection module;
The drain electrode of described the 2nd PMOS switch module connects described output voltage VO UT, and substrate is connected the output of multiple power supplies driver element with source electrode, and grid is accepted control conducting or the shutoff of described voltage detection module;
The source electrode of described nmos pass transistor with described in input supply voltage VCP1 after being raised be connected, grid is connected with the control voltage VCP2 of described boosting unit output, and meets input supply voltage VCP1 after described control voltage VCP2 is raised described in being greater than and the threshold V T H sum of described nmos pass transistor.
8. step-up DC-DC conversion method, is characterized in that comprising:
Startup stage utilize multiple power supplies driver element output input supply voltage VIN, using this input supply voltage VIN as power switch unit supply voltage, and clock converter unit drives a power switch unit to form the output voltage VO UT of step-up DC-DC transducer;
Detect described output voltage VO UT and whether arrive the first predetermined value, if reach described the first predetermined value, select and export described output voltage VO UT as the supply voltage of this power switch unit, otherwise select and export input supply voltage VIN as the supply voltage of this power switch unit;
When described output voltage VO UT is progressively increased to the second predetermined value, by circuit control unit, driven conducting or the shutoff of this power switch unit, continue to promote and maintain described output voltage VO UT to the three predetermined values.
9. method according to claim 8, it is characterized in that, startup stage utilize multiple power supplies driver element output input supply voltage VIN, using this input supply voltage VIN as power switch unit supply voltage, in the output voltage VO UT of clock converter unit driving power switch element with formation step-up DC-DC transducer, also comprise, utilize described input supply voltage VIN to produce clock pulse, the level of the supply voltage that is described power switch unit by the level conversion of described clock pulse.
10. method according to claim 8, it is characterized in that, in detection, whether described output voltage VO UT arrives the first predetermined value, if reach described predetermined value, select and export described output voltage VO UT as the supply voltage of power switch unit, otherwise select and export in the supply voltage of input supply voltage VIN as power switch unit, when described output voltage VO UT is less than the first predetermined value, conducting the one PMOS switch module, and turn-off the 2nd PMOS switch module, select and export described input supply voltage VIN; When described output voltage VO UT is greater than the first predetermined value, the 2nd PMOS switch module described in conducting, and turn-off a described PMOS switch module, select and export described output voltage VO UT.
11. methods according to claim 8, it is characterized in that, startup stage utilize multiple power supplies driver element output input supply voltage VIN, using this input supply voltage VIN as power switch unit supply voltage, in the output voltage VO UT of clock converter unit driving power switch element with formation step-up DC-DC transducer, also comprise, described input supply voltage VIN is boosted, and the voltage after utilizing this to boost is as the input of multiple power supplies driver element.
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| CN103023334B (en) * | 2012-11-26 | 2014-12-31 | 北京工业大学 | Multi-redundance aircraft electric power source and starting method thereof |
| CN104022626B (en) * | 2013-02-28 | 2017-03-01 | 力博特公司 | Drive circuit |
| CN103296880B (en) * | 2013-05-21 | 2016-03-30 | 西安电子科技大学 | Low-power-consumption boost DC-DC converter started at ultralow voltage |
| CN107370355B (en) * | 2017-07-21 | 2019-10-11 | 西安电子科技大学 | Low Voltage Startup Circuit for BOOST DC-DC Converters |
| CN109613326A (en) * | 2018-12-18 | 2019-04-12 | 上海南芯半导体科技有限公司 | A kind of input over-voltage detection circuit that can work independently and its implementation |
| WO2022137292A1 (en) * | 2020-12-21 | 2022-06-30 | サンケン電気株式会社 | Power source for driving synchronous rectification element of sepic converter |
| CN113538882B (en) * | 2021-07-16 | 2022-12-13 | 上海爻火微电子有限公司 | Signal transmission circuit and electronic equipment |
| CN113890381A (en) * | 2021-08-26 | 2022-01-04 | 广东赛微微电子股份有限公司 | Switching power supply circuit and control method thereof, power supply chip and related system |
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| JP3098471B2 (en) * | 1997-09-22 | 2000-10-16 | 山形日本電気株式会社 | Semiconductor device for low power supply |
| US6104173A (en) * | 1998-07-22 | 2000-08-15 | Ricoh Company, Ltd. | DC-DC converter and power-supply switching circuit |
| JP2005168106A (en) * | 2003-11-28 | 2005-06-23 | Toshiba Corp | Power supply unit |
| CN1278479C (en) * | 2003-12-26 | 2006-10-04 | 珠海炬力集成电路设计有限公司 | Method for lowering trigger voltage of DC-DC converter |
| JP4753826B2 (en) * | 2006-09-28 | 2011-08-24 | パナソニック株式会社 | Multi-output power supply |
| JP4888056B2 (en) * | 2006-10-30 | 2012-02-29 | 富士通セミコンダクター株式会社 | Power supply circuit, power supply control circuit, and power supply control method |
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