CN116094313A - Power supply device - Google Patents
Power supply device Download PDFInfo
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- CN116094313A CN116094313A CN202310205920.6A CN202310205920A CN116094313A CN 116094313 A CN116094313 A CN 116094313A CN 202310205920 A CN202310205920 A CN 202310205920A CN 116094313 A CN116094313 A CN 116094313A
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- power supply
- voltage
- electrically connected
- feedback resistor
- feedback
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present disclosure provides a power supply device. The power supply device includes: the control unit is electrically connected with the first power supply end, and is configured to acquire electric energy from the first power supply end and generate a switch control signal; a conversion unit configured to generate an output voltage according to the switch control signal; and a voltage adjusting unit electrically connected to the converting unit, the voltage adjusting unit being configured to reduce the voltage of the first power supply terminal when the output voltage of the converting unit satisfies a predetermined condition, so as to switch the voltage of the first power supply terminal to the output voltage of the converting unit when the reduced voltage of the first power supply terminal is smaller than the output voltage of the converting unit. In the power supply device, the input voltage of the power supply end of the controller is switched without being limited by the magnitude relation between the voltage of the output end of the power supply converter and the initial voltage of the power supply end of the controller, so that the power supply device can be expanded to a wider application field.
Description
Technical Field
Embodiments of the present disclosure relate generally to electronic circuits, and more particularly, to a power supply device.
Background
A power supply device including a power converter (including but not limited to a BUCK power converter, for example) is a power supply that uses modern power electronics to control the ratio of time that a switching tube is turned on and off to obtain a desired output voltage that is used as a power supply voltage for a corresponding terminal device. Wherein the time ratio for controlling the switching on and off of the switching tube is typically implemented by a controller, such as a BUCK controller. The controller receives power from an initial power supply, for example, via its power terminal. In some applications, a diode is provided between the output of the power converter and the power supply of the controller, and is turned on when the voltage at the output of the power converter is higher than the voltage at the power supply of the controller, and the connection between the power supply of the controller and the initial power supply is disconnected. The input voltage at the power supply terminal of the controller is then switched from the voltage of the initial power supply to the voltage at the output terminal of the power converter, so that the controller is supplied with electrical energy from the output terminal of the power converter. Thus, efficiency can be improved and power consumption of the power converter can be reduced. However, in the conventional power supply apparatus, switching of the input voltage of the power supply terminal of the controller can be achieved only when the voltage of the output terminal of the power converter is higher than the voltage of the power supply terminal of the controller, and the application field is limited.
Disclosure of Invention
In view of the foregoing, the present disclosure provides a power supply device. In the power supply device, the switching of the input voltage of the power supply end of the controller is not limited by the magnitude relation between the voltage of the output end of the power supply converter and the voltage of the power supply end of the controller, so that the power supply device can be expanded to a wider application field.
According to one aspect of the present disclosure, a power supply device is provided. The power supply device includes: the control unit is electrically connected with the first power supply end, and is configured to acquire electric energy from the first power supply end and generate a switch control signal; a conversion unit receiving the switch control signal of the control unit, the conversion unit being configured to generate an output voltage according to the switch control signal; and a voltage adjusting unit electrically connected to the converting unit, the voltage adjusting unit being configured to reduce the voltage of the first power supply terminal when the output voltage of the converting unit satisfies a predetermined condition, so as to switch the voltage of the first power supply terminal to the output voltage of the converting unit when the reduced voltage of the first power supply terminal is smaller than the output voltage of the converting unit.
In some embodiments, the voltage regulating unit includes a low dropout linear regulator (LDO), the low dropout linear regulator includes a first feedback resistor and a second feedback resistor connected in series, at least one of the first feedback resistor and the second feedback resistor is an adjustable resistor, and an output terminal of the low dropout linear regulator is electrically connected to a first power supply terminal;
the voltage adjusting unit is further configured to generate a resistance adjusting signal for adjusting the resistance of at least one of the first feedback resistance and the second feedback resistance so that the voltage of the first power supply terminal decreases when the output voltage of the converting unit satisfies a predetermined condition.
In some embodiments, the voltage regulating unit further comprises a first comparator, a positive input of the first comparator being electrically connected to the first reference voltage, a negative input of the first comparator being electrically connected to a feedback voltage of the output voltage of the converting unit, the first comparator being configured to generate the resistance regulating signal when the feedback voltage of the output voltage of the converting unit is higher than or equal to the first reference voltage.
In some embodiments, the voltage regulating unit further comprises a second comparator, a positive input terminal of the second comparator being electrically connected to the feedback voltage of the first power supply terminal, a negative input terminal of the second comparator being electrically connected to the feedback voltage of the output voltage of the converting unit, the second comparator being configured to generate the turn-on control signal to turn on the first power supply terminal with the output voltage of the converting unit when the feedback voltage of the output voltage of the converting unit is higher than or equal to the feedback voltage of the first power supply terminal.
In some embodiments, one end of the first feedback resistor is electrically connected to the first power supply terminal, the other end of the first feedback resistor is electrically connected to one end of the second feedback resistor, the other end of the second feedback resistor is grounded, and the other end of the first feedback resistor is configured to output a feedback voltage of the first power supply terminal.
In some embodiments, the low dropout linear regulator further comprises: the positive input end of the error amplifier is electrically connected with the second reference voltage, the negative input end of the error amplifier is electrically connected with the other end of the first feedback resistor, and the output end of the error amplifier is electrically connected with the grid electrode of the first NMOS device; and the drain electrode of the first NMOS device is electrically connected with the second power supply end, and the source electrode of the first NMOS device is electrically connected with the first power supply end.
In some embodiments, the second feedback resistor is an adjustable resistor, and the resistance adjustment signal is used to cause the resistance value of the second feedback resistor to increase.
In some embodiments, the voltage adjusting unit further includes a third feedback resistor and a fourth feedback resistor, one end of the third feedback resistor is electrically connected to the output voltage of the converting unit, the other end of the third feedback resistor is electrically connected to one end of the fourth feedback resistor, the other end of the fourth feedback resistor is grounded, and the other end of the third feedback resistor is configured to output a feedback voltage of the output voltage of the converting unit.
In some embodiments, the control unit is further configured to generate a first switch control signal configured to control the second NMOS device to turn on or off, and a second switch control signal configured to control the third NMOS device to turn on or off; the conversion unit includes: the drain electrode of the second NMOS device is electrically connected with the second power supply end, the grid electrode of the second NMOS device is configured to receive the first switch control signal, and the source electrode of the second NMOS device is electrically connected with the drain electrode of the third NMOS device; and a third NMOS device having a gate configured to receive the second switch control signal, the source of the third NMOS device being grounded.
In some embodiments, the conversion unit is a buck conversion unit.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements.
Fig. 1 shows a block schematic diagram of a conventional power supply apparatus.
Fig. 2 shows a block schematic diagram of a power supply device of an embodiment of the present disclosure.
Fig. 3 shows a circuit schematic of a power supply device of an embodiment of the present disclosure.
Fig. 4 shows a waveform schematic diagram of relevant voltage signals of a power supply device of an embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below.
As described above, in the conventional power supply apparatus, switching of the input voltage of the power supply terminal of the controller can be achieved only when the voltage of the output terminal of the power converter is higher than the voltage of the power supply terminal of the controller, and the application field is limited. Fig. 1 shows a block schematic diagram of a conventional power supply apparatus 100. The power supply apparatus 100 includes, for example, a controller 102, a power converter 104. The controller 102 is configured to generate a control signal for controlling a time ratio of switching on and off of switching tubes in the power converter 104. The power converter 104 generates an output voltage according to the control signal and outputs the output voltage via the output terminal VOUT thereof. When the switch KV is closed, the controller 102 receives power from the initial power supply V1 through its power terminal VC. A diode D1 is disposed between the output terminal VOUT of the power converter 104 and the power terminal VC of the controller 102. When the voltage of the output terminal VOUT of the power converter 104 is higher than the voltage of the power terminal VC of the controller 102, the diode D1 is turned on, and the switch KV is turned off, so that the connection between the power terminal VC of the controller 102 and the initial power supply V1 is disconnected. Thus, the input voltage of the power supply terminal VC of the controller 102 is switched from the voltage of the initial power supply V1 to the voltage of the output terminal VOUT of the power converter 104, so that the output terminal VOUT of the power converter 104 provides the controller 102 with electric power. It should be understood that, limited to the unidirectional conduction characteristic of the diode D1, in the power supply apparatus 100, switching of the input voltage of the power supply terminal VC of the controller 102 can be achieved only when the voltage of the output terminal VOUT of the power converter 104 is higher than the voltage of the power supply terminal VC of the controller 102.
To at least partially address one or more of the above problems, as well as other potential problems, example embodiments of the present disclosure propose a power supply arrangement solution. In the scheme of the disclosure, when the output voltage of the conversion unit meets a predetermined condition, the voltage regulating unit reduces the voltage of the first power supply end, so that when the reduced voltage of the first power supply end is smaller than the output voltage of the conversion unit, the voltage of the first power supply end is switched to the output voltage of the conversion unit, therefore, the above-mentioned switching process of the power supply device can be not limited by the magnitude relation between the initial voltage of the first power supply end and the output voltage of the conversion unit, and the application range of the power supply device is wider.
The power supply device of the embodiment of the present disclosure is described in detail below.
Fig. 2 shows a block schematic diagram of a power supply device 200 of an embodiment of the present disclosure. The power supply device 200 includes a control unit 202, a conversion unit 204, and a voltage adjustment unit 206. Wherein the control unit 202 is electrically connected to the first power supply terminal, the control unit 202 is configured to obtain electrical energy from the first power supply terminal and generate a switch control signal. The conversion unit 204 receives the switching control signal of the control unit 202, and the conversion unit 204 is configured to generate an output voltage according to the switching control signal. The voltage adjustment unit 206 is electrically connected to the conversion unit 204, and the voltage adjustment unit 206 is configured to reduce the voltage of the first power supply terminal when the output voltage of the conversion unit 204 satisfies a predetermined condition, so as to switch the voltage of the first power supply terminal to the output voltage of the conversion unit 204 when the reduced voltage of the first power supply terminal is smaller than the output voltage of the conversion unit 204.
The conversion unit 204 is, for example, a BUCK (BUCK) conversion unit. The conversion unit 204 includes, for example, a switching tube. The switching control signal generated by the control unit 202 is used to control the time ratio of the on and off of the switching transistors in the conversion unit 204. The conversion unit 204 generates an output voltage according to the switching control signal and outputs it via its output terminal.
In some embodiments, the voltage adjustment unit 206 includes a low dropout linear regulator, the low dropout linear regulator includes a first feedback resistor and a second feedback resistor connected in series, at least one of the first feedback resistor and the second feedback resistor is an adjustable resistor, and an output terminal of the low dropout linear regulator is electrically connected to the first power supply terminal; the voltage adjustment unit 206 is further configured to generate a resistance adjustment signal for adjusting the resistance of at least one of the first feedback resistance and the second feedback resistance so that the voltage of the first power supply terminal decreases when the output voltage of the conversion unit 204 satisfies a predetermined condition.
In some embodiments, the voltage adjustment unit 206 further includes a first comparator having a positive input electrically connected to the first reference voltage and a negative input electrically connected to the feedback voltage of the output voltage of the conversion unit, the first comparator configured to generate the resistance adjustment signal when the feedback voltage of the output voltage of the conversion unit 204 is greater than or equal to the first reference voltage.
In some embodiments, the voltage adjustment unit 206 further includes a second comparator, a positive input terminal of the second comparator being electrically connected to the feedback voltage of the first power supply terminal, a negative input terminal of the second comparator being electrically connected to the feedback voltage of the output voltage of the conversion unit, the second comparator being configured to generate the turn-on control signal to turn on the first power supply terminal to the output voltage of the conversion unit 204 when the feedback voltage of the output voltage of the conversion unit 204 is higher than or equal to the feedback voltage of the first power supply terminal.
In some embodiments, the second feedback resistor is an adjustable resistor, and the resistance adjustment signal is used to increase the resistance value of the second feedback resistor so as to decrease the voltage of the first power supply terminal.
Fig. 3 shows a circuit schematic of a power supply device 300 of an embodiment of the present disclosure. The power supply apparatus 300 includes a control unit 302, a conversion unit 304, and a voltage adjustment unit 306. Wherein the control unit 302 is electrically connected to the first power supply terminal VCC, the control unit 302 is configured to obtain electrical energy from the first power supply terminal VCC and generate a switching control signal. The conversion unit 304 receives the switching control signal of the control unit 302, and the conversion unit 304 is configured to generate the output voltage VOUT according to the switching control signal. The voltage adjusting unit 306 is electrically connected to the converting unit 304, and the voltage adjusting unit 306 is configured to reduce the voltage of the first power supply terminal VCC when the output voltage VOUT of the converting unit 304 satisfies a predetermined condition, so as to switch the voltage of the first power supply terminal VCC to the output voltage of the converting unit 304 when the reduced voltage of the first power supply terminal VCC is smaller than the output voltage of the converting unit 304. A first capacitor C1 is disposed between the first power supply terminal VCC and the ground GND.
The voltage regulating unit 306 includes a low dropout linear regulator 362. The low dropout linear regulator 362 includes a first feedback resistor R1 and a second feedback resistor R2 connected in series. At least one of the first feedback resistor R1 and the second feedback resistor R2 is an adjustable resistor, and an output terminal of the low dropout linear regulator 362 is electrically connected to the first power supply terminal VCC. The voltage adjusting unit 306 is further configured to generate a resistance adjusting signal for adjusting the resistance of at least one of the first feedback resistor R1 and the second feedback resistor R2 such that the voltage of the first power supply terminal VCC decreases when the output voltage of the converting unit 304 satisfies a predetermined condition.
One end of the first feedback resistor R1 is electrically connected to the first power supply end VCC, the other end of the first feedback resistor R1 is electrically connected to one end of the second feedback resistor R2, and the other end of the second feedback resistor R2 is grounded GND. The other end of the first feedback resistor R1 is configured to output a feedback voltage Vf of the voltage of the first power supply terminal VCC.
The low dropout linear regulator 362 further includes an error amplifier EA and a first NMOS device M1. The positive input end of the error amplifier EA is electrically connected with the second reference voltage VREF, the negative input end of the error amplifier EA is electrically connected with the other end of the first feedback resistor R1, and the output end GT1 of the error amplifier EA is electrically connected with the grid electrode of the first NMOS device M1. The drain of the first NMOS device M1 is electrically connected to the second power supply terminal VIN, and the source of the first NMOS device M1 is connected to the first power supply terminal VCC. As an alternative embodiment, the second feedback resistor R2 is an adjustable resistor, and the resistance adjustment signal is used to increase the resistance value of the second feedback resistor R2, so that the voltage of the first power supply terminal VCC decreases. The first NMOS device M1 is, for example, a power device.
The voltage regulating unit 306 further includes a third feedback resistor R3 and a fourth feedback resistor R4. One end of the third feedback resistor R3 is electrically connected to the output voltage VOUT of the conversion unit 304, the other end of the third feedback resistor R3 is electrically connected to one end of the fourth feedback resistor R4, the other end of the fourth feedback resistor R4 is grounded GND, and the other end of the third feedback resistor R3 is configured to output the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304.
The voltage regulating unit 306 further includes a first comparator CMP1. The positive input terminal of the first comparator CMP1 is electrically connected to the first reference voltage VREF1, the negative input terminal of the first comparator CMP1 is electrically connected to the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304, and the output terminal S1 of the first comparator CMP1 is electrically connected to the regulated feedback resistor (e.g., the second feedback resistor R2). The first comparator CMP1 is configured to generate a resistance adjustment signal when the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304 is higher than or equal to the first reference voltage VREF1, and output via the output terminal S1 of the first comparator CMP1.
The voltage regulating unit 306 further includes a second comparator CMP2. The positive input end of the second comparator CMP2 is electrically connected to the feedback voltage Vf of the voltage of the first power supply end VCC, the negative input end of the second comparator CMP2 is electrically connected to the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304, and the output end S2 of the second comparator CMP2 is electrically connected to the control end of the second switch K1, for controlling the second switch K1 to be turned on or off. The second comparator CMP2 is configured to generate an on control signal to cause the first power supply terminal VCC to be turned on with the output voltage VOUT of the conversion unit 304 when the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304 is higher than or equal to the feedback voltage Vf of the voltage of the first power supply terminal VCC. For example, the turn-on control signal generated by the second comparator CMP2 controls the second switch K1 to be turned on, so that the first power supply terminal VCC is turned on with the output voltage VOUT of the conversion unit 304.
The control unit 302 is further configured to generate a first switch control signal HO and a second switch control signal LO. The first switching control signal HO is configured to control the second NMOS device Q1 to be turned on or off, and the second switching control signal LO is configured to control the third NMOS device Q2 to be turned on or off.
The conversion unit 304 includes a second NMOS device Q1, a third NMOS device Q2, an inductance L, a resistance R0, and a capacitance C0. The drain electrode of the second NMOS device Q1 is electrically connected to the second power supply terminal VIN, the gate electrode of the second NMOS device Q1 is configured to receive the first switching control signal HO, the source electrode of the second NMOS device Q1 is electrically connected to the drain electrode of the third NMOS device Q2, the gate electrode of the third NMOS device Q2 is configured to receive the second switching control signal LO, and the source electrode of the third NMOS device Q2 is grounded GND. That is, the second power source VIN may provide power to the control unit 302 or the conversion unit 304.
Fig. 4 shows a waveform schematic diagram of relevant voltage signals of the power supply device 300 of the embodiment of the present disclosure. Wherein the horizontal axis represents time (t) and the vertical axis represents voltage. It is assumed that the power supply device 300 starts to operate at time t 1. The output terminal S2 of the second comparator CMP2 outputs a high level signal, which does not belong to an on control signal (which may be referred to as an off signal, for example), which brings the second switch K1 into an off state. The output GT1 of the error amplifier EA is high, and the first NMOS device M1 is turned on. The working principle of the low dropout linear voltage regulator is as follows: vcc= (r1+r2)/r2×vref. The initial voltage VCC1 of the first power supply terminal VCC is determined by the initial values (assuming R20) of the first feedback resistor R1 and the second feedback resistor R2, so VCC 1= (r1+r20)/r20×vref.
During operation of the conversion unit 304, the output voltage VOUT of the conversion unit 304 gradually increases. At time t2, when the output voltage VOUT of the conversion unit 304 rises such that the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304 is equal to or even higher than the first reference voltage VREF1, the output terminal S1 of the first comparator CMP1 outputs a low-level signal as a resistance adjustment signal such that the resistance value of the second feedback resistor R2 increases. As the resistance value of the second feedback resistor R2 gradually increases, the voltage of the first power supply terminal VCC gradually decreases. For ease of illustration, the effect of only considering the range of adjustable resistance values of the first feedback resistor R1 and the second feedback resistor R2 (irrespective of the effect of the second switch K1 being turned on) is represented by a dashed line, the lowest voltage value VCC2 to which the first power supply terminal VCC may be lowered, wherein VCC 2= (r1+r21)/r21×vref, R21 for example represents the maximum resistance value of the second feedback resistor R2 that can be reached adjustably.
As the voltage of the first power supply terminal VCC gradually decreases, at time t3, the feedback voltage Vf of the voltage of the first power supply terminal VCC is lower than the feedback voltage Vfb1 of the output voltage VOUT of the conversion unit 304 (at this time, the voltage of the first power supply terminal VCC is slightly lower than the output voltage VOUT of the conversion unit 304), and thus the output terminal S2 of the second comparator CMP2 outputs a low-level signal that makes the second switch K1 conductive as an on control signal. Thus, the voltage of the first power terminal VCC is equal to the output voltage VOUT of the conversion unit 304 (slightly higher than the voltage of the first power terminal VCC before the second switch K1 is turned on). Therefore, at this time, the feedback voltage Vf of the voltage of the first power supply terminal VCC is slightly higher than the second reference voltage VREF, and then the error amplifier EA output terminal GT1 outputs a low-level signal, so that the first NMOS device M1 is turned off, and the path between the second power supply terminal VIN and the first power supply terminal VCC is cut off, thereby saving power consumption and improving efficiency.
In the power supply device 300, through reasonable configuration of the first feedback resistor R1, the second feedback resistor R2, the third feedback resistor R3, the fourth feedback resistor R4, and the first reference voltage VREF1 and the second reference voltage VREF, the switching of the power source first power supply terminal VCC of the control unit 302 can be avoided by the limitation of the magnitude relation between the initial voltage of the first power supply terminal VCC and the output voltage VOUT of the conversion unit 304.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
The foregoing is merely an alternative embodiment of the present disclosure, and is not intended to limit the present disclosure, and various modifications and variations may be made to the present disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (10)
1. A power supply device, characterized by comprising:
the control unit is electrically connected with the first power supply end, and is configured to acquire electric energy from the first power supply end and generate a switch control signal;
a conversion unit receiving the switch control signal of the control unit, the conversion unit being configured to generate an output voltage according to the switch control signal; and
and a voltage regulating unit electrically connected to the converting unit, the voltage regulating unit being configured to reduce the voltage of the first power supply terminal when the output voltage of the converting unit satisfies a predetermined condition, so as to switch the voltage of the first power supply terminal to the output voltage of the converting unit when the reduced voltage of the first power supply terminal is smaller than the output voltage of the converting unit.
2. The power supply device according to claim 1, wherein the voltage regulating unit comprises a low dropout linear regulator, the low dropout linear regulator comprises a first feedback resistor and a second feedback resistor connected in series, at least one of the first feedback resistor and the second feedback resistor is an adjustable resistor, and an output end of the low dropout linear regulator is electrically connected with the first power supply end;
the voltage adjusting unit is further configured to generate a resistance adjusting signal for adjusting the resistance of at least one of the first feedback resistance and the second feedback resistance so that the voltage of the first power supply terminal decreases when the output voltage of the converting unit satisfies a predetermined condition.
3. The power supply apparatus according to claim 2, wherein the voltage adjustment unit further comprises a first comparator, a positive input terminal of the first comparator being electrically connected to the first reference voltage, a negative input terminal of the first comparator being electrically connected to a feedback voltage of the output voltage of the conversion unit, the first comparator being configured to generate the resistance adjustment signal when the feedback voltage of the output voltage of the conversion unit is higher than or equal to the first reference voltage.
4. A power supply apparatus according to claim 3, wherein the voltage regulating unit further comprises a second comparator, a positive input terminal of the second comparator being electrically connected to the feedback voltage of the first power supply terminal, a negative input terminal of the second comparator being electrically connected to the feedback voltage of the output voltage of the converting unit, the second comparator being configured to generate the on control signal to cause the first power supply terminal to be on with the output voltage of the converting unit when the feedback voltage of the output voltage of the converting unit is higher than or equal to the feedback voltage of the first power supply terminal.
5. The power supply device according to claim 4, wherein one end of the first feedback resistor is electrically connected to the first power supply terminal, the other end of the first feedback resistor is electrically connected to one end of the second feedback resistor, the other end of the second feedback resistor is grounded, and the other end of the first feedback resistor is configured to output a feedback voltage of the first power supply terminal.
6. The power supply of claim 5, wherein the low dropout linear regulator further comprises:
the positive input end of the error amplifier is electrically connected with the second reference voltage, the negative input end of the error amplifier is electrically connected with the other end of the first feedback resistor, and the output end of the error amplifier is electrically connected with the grid electrode of the first NMOS device; and
and the drain electrode of the first NMOS device is electrically connected with the second power supply end, and the source electrode of the first NMOS device is electrically connected with the first power supply end.
7. The power supply apparatus according to any one of claims 2 to 6, wherein the second feedback resistor is an adjustable resistor, and the resistance adjustment signal is used to increase the resistance value of the second feedback resistor.
8. The power supply apparatus according to claim 7, wherein the voltage adjusting unit further comprises a third feedback resistor and a fourth feedback resistor, one end of the third feedback resistor is electrically connected to the output voltage of the converting unit, the other end of the third feedback resistor is electrically connected to one end of the fourth feedback resistor, the other end of the fourth feedback resistor is grounded, and the other end of the third feedback resistor is configured to output a feedback voltage of the output voltage of the converting unit.
9. The power supply apparatus according to claim 1, wherein the control unit is further configured to generate a first switch control signal configured to control the second NMOS device to be turned on or off, and a second switch control signal configured to control the third NMOS device to be turned on or off;
the conversion unit includes:
the drain electrode of the second NMOS device is electrically connected with the second power supply end, the grid electrode of the second NMOS device is configured to receive the first switch control signal, and the source electrode of the second NMOS device is electrically connected with the drain electrode of the third NMOS device; and
and the grid electrode of the third NMOS device is configured to receive the second switch control signal, and the source electrode of the third NMOS device is grounded.
10. The power supply device according to claim 1, wherein the conversion unit is a buck conversion unit.
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| CN116094313B (en) | 2023-08-01 |
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