CN117691860A - DCDC internal power supply device and DCDC power converter - Google Patents
DCDC internal power supply device and DCDC power converter Download PDFInfo
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Abstract
The invention discloses a DCDC internal power supply device and a DCDC power supply converter, comprising a filtering module, an SWLDO power supply module, a judging control module and a power supply selection module; the input end of the filtering module is a SW square wave signal, and the output end of the filtering module is connected with the input end of the SWLDO power supply module; the input ends of the judging control module and the power supply selection module are connected with the output end of the SWLDO power supply module and an external power supply; the output end of the judgment control module is connected with the power supply selection module; the output end of the power supply selection module is the voltage output end of the device; the SW square wave signal is converted into the stable DC voltage VCC2 through the filtering module and the SWLDO power supply module, the external power supply VCC1 and the DC voltage VCC2 are compared through the judging control module, the power supply selection module is controlled to select one path of output VCC from the VCC1 and the VCC2, automatic selection and switching of the power supply in the DCDC are achieved, and the power supply efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to the technical field of a DCDC power supply converter, and more particularly relates to a DCDC internal power supply device and a DCDC power supply converter.
Background
In the traditional DCDC power supply conversion chip, the internal circuit is powered by an external power supply, and the internal power supply efficiency is low when the input voltage is higher and the internal working voltage of DCDC is lower due to the fact that the external power supply is relatively large in change.
Therefore, how to improve the internal power supply efficiency of DCDC is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a DCDC internal power supply device and a DCDC power converter to solve the problem of low internal power supply efficiency of DCDC in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a DCDC internal power supply device, comprising: the device comprises a filtering module, an SWLDO power supply module, a judging control module and a power supply selection module;
the input end of the filtering module is a SW square wave signal, and the output end of the filtering module is connected with the input end of the SWLDO power supply module; the input ends of the judging control module and the power supply selection module are connected with the output end of the SWLDO power supply module and an external power supply; the output end of the judgment control module is connected with the power supply selection module; the output end of the power supply selection module is the voltage output end of the DCDC internal power supply device;
the filtering module is used for converting the SW square wave signal into direct-current voltage through filtering and outputting the direct-current voltage to the SWLDO power supply module;
the SWLDO power supply module is used for converting the direct-current voltage output by the filtering module into stable DC voltage VCC2 and outputting the stable DC voltage VCC2 to the power supply selection module and the judging control module;
the judging control module is used for acquiring DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, comparing VCC1 with VCC2, and outputting a power supply selection control signal to the power supply selection module according to the comparison result;
the power supply selection module is used for acquiring the DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, and selecting one path of output VCC from VCC1 and VCC2 according to the power supply selection control signal.
Preferably, the filtering module is an RC architecture and comprises a first resistor and a first capacitor;
and converting the SW square wave signal into a direct-current voltage signal through a first resistor and a first capacitor, and outputting the direct-current voltage signal to the SWLDO power supply module.
Preferably, the SWLDO power supply module comprises a first PMOS tube, an error amplifier, a second resistor and a third resistor;
the positive input end of the error amplifier is a reference voltage, the power end of the error amplifier and the drain electrode of the first PMOS tube are both connected with the output end of the filter module, the output end of the error amplifier is connected with the grid electrode of the first PMOS tube, the source electrode of the first PMOS tube is connected with one end of the second resistor, the other end of the second resistor is respectively connected with the negative input end of the error amplifier and one end of the third resistor, the other end of the third resistor is grounded, and the source electrode of the first PMOS tube is the output end of the SWLDO power supply module;
the SWLDO power supply module controls the first PMOS tube to output DC stabilized voltage VCC2 through the error amplifier.
Preferably, the DC stabilizing voltage VCC2 is specifically:
VCC2=Vref2*（R2+R3）/R3；
wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, the second resistor and the third resistor are voltage division feedback resistors, and Vref2 is the input reference voltage.
Preferably, the judgment control module comprises a comparator CMP1 and an inverter INV1;
the positive input end of the comparator is connected with an external power supply, the negative input end of the comparator is connected with the output end of the SWLDO power supply module, the output end of the comparator is respectively connected with the input end of the power supply selection module and the input end of the inverter, a control signal A is output, and the output end of the inverter is connected with the input end of the power supply selection module, and a control signal B is output;
the judging control module judges the output voltage values VCC1 and VCC2 of the external power supply and the SWLDO power supply module through the comparator and outputs control signals A and B to the power supply selection module.
Preferably, the power supply selection module comprises a third PMOS tube and a fourth PMOS tube;
the drain electrode of the third PMOS tube is connected with the output end of the SWLDO power supply module, the grid electrode of the third PMOS tube is connected with the output end of the comparator of the judgment control module, and the third PMOS tube receives the control signal A;
the drain electrode of the fourth PMOS tube is connected with an external power supply, the grid electrode of the fourth PMOS tube is connected with the output end of the inverter of the judgment control module, and the fourth PMOS tube receives a control signal B;
the source electrode of the third PMOS tube is connected with the source electrode of the fourth PMOS tube, and is the output end of the power supply selection module, and the voltage VCC is output.
Preferably, the output voltage VCC at the output end of the power supply selection module is specifically:
when VCC2< VCC1, a=1, b=0, the fourth PMOS transistor is turned on, the third PMOS transistor is turned off, vcc=vcc 1;
when VCC2> VCC1, a=0, b=1, the third PMOS transistor is turned on, the fourth PMOS transistor is turned off, vcc=vcc 2.
A DCDC power supply converter is based on the DCDC internal power supply device and comprises a DCDC internal power supply device, a PRE_LDO auxiliary power supply, a DCDC core module, a bootstrap circuit, a fifth MOS tube, a sixth MOS tube, a fifth resistor and a second capacitor;
the output end of the PRE_LDO auxiliary power supply is VCC1, the PRE_LDO auxiliary power supply is connected with a DCDC internal power supply device, the output end of the DCDC internal power supply device is connected with the input end of a DCDC core module, the output end of the DCDC core module is respectively connected with the grid electrode of a sixth MOS tube and the grid electrode of a fifth MOS tube through a bootstrap circuit, the drain electrode of the fifth MOS tube is externally connected with an external power supply, the source electrode of the fifth MOS tube outputs SW square wave signals and is connected with the input end of a filtering module of the DCDC internal power supply device, the source electrode of the fifth MOS tube is respectively connected with the drain electrode of the sixth MOS tube and one end of a fifth resistor, the other end of the fifth resistor is respectively connected with one end of a load and a second capacitor, and the other end of the second capacitor is grounded.
Preferably, the circuit architecture of the pre_ldo auxiliary power supply includes a resistor R0, a zener diode D0, an NMOS transistor NM0, and a fourth resistor R4;
one end of the resistor R0 is connected with an external power supply VIN, the other end of the resistor R0 is respectively connected with the zener diode D0 and the gate end of the NMOS tube NM0, stable V1 voltage is obtained through the characteristics of the zener diode, the drain end of the NMOS tube NM0 is connected with the external power supply VIN, the source end outputs VCC1, and the fourth resistor R4 is a load resistor.
Preferably, the working method of the DCDC power supply converter specifically comprises the following steps:
when the power is just on, the SW square wave signal is 0, the output end VCC1 of the PRE_LDO auxiliary power supply is electrified, the judgment control module controls the power supply selection module to output the voltage VCC by taking the VCC1 as the output end of the DCDC internal power supply device, and the voltage VCC is supplied to the DCDC core module;
after the DCDC core module is started, the output end of the fifth MOS tube generates a SW square wave signal, the SW square wave signal provides direct current voltage to the SWLDO power module through the filtering module, and then stable DC voltage VCC2 is output through the SWLDO power module;
judging whether the VCC2 meets the judging condition by the judging control module, if so, switching the output voltage VCC=VCC2 to the DCDC core module, otherwise, switching the output voltage VCC=VCC1 to the DCDC core module.
Compared with the prior art, the invention discloses the DCDC internal power supply device and the DCDC power supply converter, which can realize automatic selection and switching of the internal power supply of the DCDC, improve the power supply efficiency, and have simple circuits and easy realization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a DCDC internal power supply device according to the present invention;
FIG. 2 is a schematic diagram of a filter module and SWLDO power module according to the present invention;
FIG. 3 is a schematic diagram of the waveforms of the filter module and the SWLDO power module according to the present invention;
FIG. 4 is a schematic circuit diagram of a judgment control module and a power selection module according to the present invention;
fig. 5 is a schematic diagram of a DCDC power converter according to the present invention;
FIG. 6 is a schematic diagram of the PRE_LDO auxiliary power supply according to the present invention;
fig. 7 is a schematic diagram of a power architecture of a conventional DCDC internal power supply device according to the present invention;
fig. 8 is a schematic diagram comparing the conversion efficiency of the present invention with that of the conventional DCDC power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a DCDC internal power supply device, as shown in figure 1, comprising: the device comprises a filtering module, an SWLDO power supply module, a judging control module and a power supply selection module;
the input end of the filtering module is a SW square wave signal, and the output end of the filtering module is connected with the input end of the SWLDO power supply module; the input ends of the judging control module and the power supply selection module are connected with the output end of the SWLDO power supply module and an external power supply; the output end of the judgment control module is connected with the power supply selection module; the output end of the power supply selection module is the voltage output end of the DCDC internal power supply device;
the filtering module is used for converting the SW square wave signal into direct-current voltage through filtering and outputting the direct-current voltage to the SWLDO power supply module;
the SWLDO power supply module is used for converting the direct-current voltage output by the filtering module into stable DC voltage VCC2 and outputting the stable DC voltage VCC2 to the power supply selection module and the judging control module;
the judging control module is used for acquiring DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, comparing VCC1 with VCC2, and outputting a power supply selection control signal to the power supply selection module according to the comparison result;
the power supply selection module is used for acquiring the DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, and selecting one path of output VCC from VCC1 and VCC2 according to the power supply selection control signal.
In order to further implement the above technical solution, as shown in fig. 2, the filtering module is an RC architecture, and includes a first resistor R1 and a first capacitor C1;
the SW square wave signal is converted into a direct-current voltage signal through the first resistor R1 and the first capacitor C1 and is output to the SWLDO power supply module.
In order to further implement the above technical scheme, the SWLDO power supply module includes a first PMOS tube PM1, an error amplifier opa1, a second resistor R2, and a third resistor R3;
the positive input end of the error amplifier opa1 is a reference voltage Vref2, the power end of the error amplifier and the drain electrode of the first PMOS tube are both connected with the output end of the filter module, the output end of the error amplifier is connected with the grid electrode of the first PMOS tube, the source electrode of the first PMOS tube is connected with one end of the second resistor, the other end of the second resistor is respectively connected with the negative input end of the error amplifier and one end of the third resistor, the other end of the third resistor is grounded, and the source electrode of the first PMOS tube is the output end of the SWLDO power module;
the SWLDO power supply module controls the first PMOS tube to output DC stabilized voltage VCC2 through the error amplifier.
In order to further implement the above technical solution, the DC stabilizing voltage VCC2 is specifically:
VCC2=Vref2*（R2+R3）/R3；
wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, the second resistor and the third resistor are voltage division feedback resistors, and Vref2 is the input reference voltage.
As shown in fig. 3, the sw square wave signal generates an output triangular wave through the filtering module, and then outputs a stable voltage signal through the SWLDO power module.
In order to further implement the above technical solution, as shown in fig. 4, the judgment control module includes a comparator CMP1 and an inverter INV1;
the positive input end of the comparator is connected with an external power supply, the negative input end of the comparator is connected with the output end of the SWLDO power supply module, the output end of the comparator is respectively connected with the input end of the power supply selection module and the input end of the inverter, a control signal A is output, and the output end of the inverter is connected with the input end of the power supply selection module, and a control signal B is output;
the judging control module judges the output voltage values VCC1 and VCC2 of the external power supply and the SWLDO power supply module through the comparator and outputs control signals A and B to the power supply selection module.
In order to further implement the above technical scheme, the power supply selection module includes a third PMOS tube PM3 and a fourth PMOS tube PM4;
the drain electrode of the third PMOS tube is connected with the output end of the SWLDO power supply module, the grid electrode of the third PMOS tube is connected with the output end of the comparator of the judgment control module, and the third PMOS tube receives the control signal A;
the drain electrode of the fourth PMOS tube is connected with an external power supply, the grid electrode of the fourth PMOS tube is connected with the output end of the inverter of the judgment control module, and the fourth PMOS tube receives a control signal B;
the source electrode of the third PMOS tube is connected with the source electrode of the fourth PMOS tube, and is the output end of the power supply selection module, and the voltage VCC is output.
In order to further implement the above technical solution, the output voltage VCC at the output end of the power supply selection module is specifically:
when VCC2< VCC1, a=1, b=0, the fourth PMOS transistor is turned on, the third PMOS transistor is turned off, vcc=vcc 1;
when VCC2> VCC1, a=0, b=1, the third PMOS transistor is turned on, the fourth PMOS transistor is turned off, vcc=vcc 2.
A DCDC power converter is based on a DCDC internal power supply device, as shown in fig. 5, and comprises a DCDC internal power supply device, a PRE_LDO auxiliary power supply, a DCDC core module, a bootstrap circuit, a fifth MOS tube NM5, a sixth MOS tube NM6, a fifth resistor L5 and a second capacitor C2;
the output end of the PRE_LDO auxiliary power supply is VCC1, the PRE_LDO auxiliary power supply is connected with a DCDC internal power supply device, the output end of the DCDC internal power supply device is connected with the input end of a DCDC core module, the output end of the DCDC core module is respectively connected with the grid electrode of a sixth MOS tube and the grid electrode of a fifth MOS tube through a bootstrap circuit, the drain electrode of the fifth MOS tube is externally connected with an external power supply, the source electrode of the fifth MOS tube outputs SW square wave signals and is connected with the input end of a filtering module of the DCDC internal power supply device, the source electrode of the fifth MOS tube is respectively connected with the drain electrode of the sixth MOS tube and one end of a fifth resistor, the other end of the fifth resistor is respectively connected with one end of a load and a second capacitor, and the other end of the second capacitor is grounded.
In order to further implement the above technical solution, as shown in fig. 6, the circuit architecture of the pre_ldo auxiliary power supply includes a resistor R0, a zener diode D0, an NMOS tube NM0, and a fourth resistor R4;
one end of the resistor R0 is connected with an external power supply VIN, the other end of the resistor R0 is respectively connected with a zener diode D0 and the gate end of the NMOS tube NM0, stable V1 voltage is obtained through the characteristics of the zener diode, the drain end of the NMOS tube NM0 is connected with the external power supply VIN, the source end outputs VCC1, and the fourth resistor R4 is a load resistor;
in this embodiment, VCC 1=vbc_do-Vthn;
wherein vbc_do is the breakdown voltage of zener diode D0, vthn is the threshold voltage of NMOS transistor NM 0.
In order to further implement the technical scheme, the working method of the DCDC power converter specifically comprises the following steps:
when the power is just on, the SW square wave signal is 0, the output end VCC1 of the PRE_LDO auxiliary power supply is electrified, the judgment control module controls the power supply selection module to output the voltage VCC by taking the VCC1 as the output end of the DCDC internal power supply device, and the voltage VCC is supplied to the DCDC core module;
after the DCDC core module is started, the output end of the fifth MOS tube generates a SW square wave signal, the SW square wave signal provides direct current voltage to the SWLDO power module through the filtering module, and then stable DC voltage VCC2 is output through the SWLDO power module;
judging whether the VCC2 meets the judging condition by the judging control module, if so, switching the output voltage VCC=VCC2 to the DCDC core module, otherwise, switching the output voltage VCC=VCC1 to the DCDC core module.
In another embodiment, taking the external power VIN input equal to 100V as an example in fig. 8, the conventional DCDC internal power supply device of fig. 7 is compared;
the PRE_LDO auxiliary power supply converts 100V into a 4V output value DCDC core module, and the conversion efficiency of VCC1 is only 4%; the SW voltage is a PWM waveform from 100V to 0V, triangular waves are generated after filtering, the peak value of the triangular waves is 6V, the valley value of the triangular waves is 5V, after the triangular waves are regulated by the SWLDO power supply module, the stable voltage VCC2 with the voltage of 4.5V is output, the conversion efficiency is 50%, the conversion efficiency of the filtering module and the SWLDO power supply module is 50%, the conversion efficiency is obviously higher than that of the PRE_LDO auxiliary power supply by 4%, and the power supply selection module finally selects high voltage to output to the DCDC core module for supplying power.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A DCDC internal power supply device, comprising: the device comprises a filtering module, an SWLDO power supply module, a judging control module and a power supply selection module;
the input end of the filtering module is a SW square wave signal, and the output end of the filtering module is connected with the input end of the SWLDO power supply module; the input ends of the judging control module and the power supply selection module are connected with the output end of the SWLDO power supply module and an external power supply; the output end of the judgment control module is connected with the power supply selection module; the output end of the power supply selection module is the voltage output end of the DCDC internal power supply device;
the filtering module is used for converting the SW square wave signal into direct-current voltage through filtering and outputting the direct-current voltage to the SWLDO power supply module;
the SWLDO power supply module is used for converting the direct-current voltage output by the filtering module into stable DC voltage VCC2 and outputting the stable DC voltage VCC2 to the power supply selection module and the judging control module;
the judging control module is used for acquiring DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, comparing VCC1 with VCC2, and outputting a power supply selection control signal to the power supply selection module according to the comparison result;
the power supply selection module is used for acquiring the DC voltage VCC2 output by the external power supply VCC1 and the SWLDO power supply module, and selecting one path of output VCC from VCC1 and VCC2 according to the power supply selection control signal.
2. The DCDC internal power supply unit of claim 1, wherein the filtering module is an RC architecture, and comprises a first resistor and a first capacitor;
and converting the SW square wave signal into a direct-current voltage signal through a first resistor and a first capacitor, and outputting the direct-current voltage signal to the SWLDO power supply module.
3. The DCDC internal power supply of claim 1, wherein the SWLDO power supply module includes a first PMOS tube, an error amplifier, a second resistor, and a third resistor;
the positive input end of the error amplifier is a reference voltage, the power end of the error amplifier and the drain electrode of the first PMOS tube are both connected with the output end of the filter module, the output end of the error amplifier is connected with the grid electrode of the first PMOS tube, the source electrode of the first PMOS tube is connected with one end of the second resistor, the other end of the second resistor is respectively connected with the negative input end of the error amplifier and one end of the third resistor, the other end of the third resistor is grounded, and the source electrode of the first PMOS tube is the output end of the SWLDO power supply module;
the SWLDO power supply module controls the first PMOS tube to output DC stabilized voltage VCC2 through the error amplifier.
4. A DCDC internal power supply according to claim 3, characterized in that the DC regulated voltage VCC2 is specifically:
VCC2=Vref2*（R2+R3）/R3；
wherein, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, the second resistor and the third resistor are voltage division feedback resistors, and Vref2 is the input reference voltage.
5. The DCDC internal power supply unit of claim 1, wherein the judgment control module includes a comparator and an inverter;
the positive input end of the comparator is connected with an external power supply, the negative input end of the comparator is connected with the output end of the SWLDO power supply module, the output end of the comparator is respectively connected with the input end of the power supply selection module and the input end of the inverter, a control signal A is output, and the output end of the inverter is connected with the input end of the power supply selection module, and a control signal B is output;
the judging control module judges the output voltage values VCC1 and VCC2 of the external power supply and the SWLDO power supply module through the comparator and outputs control signals A and B to the power supply selection module.
6. The DCDC internal power supply unit of claim 5, wherein the power selection module includes a third PMOS tube and a fourth PMOS tube;
the drain electrode of the third PMOS tube is connected with the output end of the SWLDO power supply module, the grid electrode of the third PMOS tube is connected with the output end of the comparator of the judgment control module, and the third PMOS tube receives the control signal A;
the drain electrode of the fourth PMOS tube is connected with an external power supply, the grid electrode of the fourth PMOS tube is connected with the output end of the inverter of the judgment control module, and the fourth PMOS tube receives a control signal B;
the source electrode of the third PMOS tube is connected with the source electrode of the fourth PMOS tube, and is the output end of the power supply selection module, and the voltage VCC is output.
7. The DCDC internal power supply device according to claim 1, wherein the output voltage VCC at the output terminal of the power selection module is specifically:
when VCC2< VCC1, a=1, b=0, the fourth PMOS transistor is turned on, the third PMOS transistor is turned off, vcc=vcc 1;
when VCC2> VCC1, a=0, b=1, the third PMOS transistor is turned on, the fourth PMOS transistor is turned off, vcc=vcc 2.
8. A DCDC power converter, characterized in that it comprises a DCDC internal power supply device, a pre_ldo auxiliary power supply, a DCDC core module, a bootstrap circuit, a fifth MOS transistor, a sixth MOS transistor, a fifth resistor and a second capacitor, based on the DCDC internal power supply device of any one of claims 1 to 7;
the output end of the PRE_LDO auxiliary power supply is VCC1, the PRE_LDO auxiliary power supply is connected with a DCDC internal power supply device, the output end of the DCDC internal power supply device is connected with the input end of a DCDC core module, the output end of the DCDC core module is respectively connected with the grid electrode of a sixth MOS tube and the grid electrode of a fifth MOS tube through a bootstrap circuit, the drain electrode of the fifth MOS tube is externally connected with an external power supply, the source electrode of the fifth MOS tube outputs SW square wave signals and is connected with the input end of a filtering module of the DCDC internal power supply device, the source electrode of the fifth MOS tube is respectively connected with the drain electrode of the sixth MOS tube and one end of a fifth resistor, the other end of the fifth resistor is respectively connected with one end of a load and a second capacitor, and the other end of the second capacitor is grounded.
9. The DCDC power converter of claim 8, wherein the circuit architecture of the pre_ldo auxiliary power supply includes a resistor R0, a zener diode D0, an NMOS tube NM0, and a fourth resistor R4;
one end of the resistor R0 is connected with an external power supply VIN, the other end of the resistor R0 is respectively connected with the zener diode D0 and the gate end of the NMOS tube NM0, stable V1 voltage is obtained through the characteristics of the zener diode, the drain end of the NMOS tube NM0 is connected with the external power supply VIN, the source end outputs VCC1, and the fourth resistor R4 is a load resistor.
10. The DCDC power converter of claim 8, wherein the DCDC power converter operates by:
when the power is just on, the SW square wave signal is 0, the output end VCC1 of the PRE_LDO auxiliary power supply is electrified, the judgment control module controls the power supply selection module to output the voltage VCC by taking the VCC1 as the output end of the DCDC internal power supply device, and the voltage VCC is supplied to the DCDC core module;
after the DCDC core module is started, the output end of the fifth MOS tube generates a SW square wave signal, the SW square wave signal provides direct current voltage to the SWLDO power module through the filtering module, and then stable DC voltage VCC2 is output through the SWLDO power module;
judging whether the VCC2 meets the judging condition by the judging control module, if so, switching the output voltage VCC=VCC2 to the DCDC core module, otherwise, switching the output voltage VCC=VCC1 to the DCDC core module.
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Citations (10)
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| CN114944748A (en) * | 2022-07-20 | 2022-08-26 | 中科(深圳)无线半导体有限公司 | Constant frequency control circuit and method for constant on-time control mode converter |
| CN116742920A (en) * | 2023-05-25 | 2023-09-12 | 江苏帝奥微电子股份有限公司 | NMOS power switch tube driving circuit and control method thereof |
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| CN101364745A (en) * | 2007-08-08 | 2009-02-11 | 鹏智科技(深圳)有限公司 | Electronic apparatus capable of automatically choosing power supply source |
| CN101557122A (en) * | 2009-02-24 | 2009-10-14 | 深圳市民展科技开发有限公司 | Duplicate supply selection circuit |
| CN103023298A (en) * | 2013-01-04 | 2013-04-03 | 无锡硅动力微电子股份有限公司 | Self-powered circuit applied to AC-DC (alternating current to digital current) switching mode power converter |
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| CN106385100A (en) * | 2016-09-18 | 2017-02-08 | 英特格灵芯片(天津)有限公司 | Ldo circuit |
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| US20190028027A1 (en) * | 2017-07-18 | 2019-01-24 | Electronics And Telecommunications Research Institute | Switch mode power supply using a reconfigurable delta-sigma modulator and method of driving the same |
| CN114944748A (en) * | 2022-07-20 | 2022-08-26 | 中科(深圳)无线半导体有限公司 | Constant frequency control circuit and method for constant on-time control mode converter |
| CN116742920A (en) * | 2023-05-25 | 2023-09-12 | 江苏帝奥微电子股份有限公司 | NMOS power switch tube driving circuit and control method thereof |
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