CN111555602A - Power supply control circuit and power supply device of DC-DC chip - Google Patents

Power supply control circuit and power supply device of DC-DC chip Download PDF

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CN111555602A
CN111555602A CN202010461686.XA CN202010461686A CN111555602A CN 111555602 A CN111555602 A CN 111555602A CN 202010461686 A CN202010461686 A CN 202010461686A CN 111555602 A CN111555602 A CN 111555602A
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chip
voltage
resistor
power supply
voltage comparator
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CN111555602B (en
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刘均
林琪钧
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Shenzhen Launch Technology Co Ltd
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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
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses power control circuit and power supply unit of DC-DC chip includes: the anode of the input power supply is connected with the power supply end of the DC-DC chip; the first end of the first resistor is connected with the anode of the input power supply; the first end of the second resistor is connected with the negative electrode of the input power supply, and the second end of the second resistor is connected with the second end of the first resistor; the positive phase input end of the voltage comparator is connected with the second end of the first resistor, and the output end of the voltage comparator is connected with the enabling end of the DC-DC chip; when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs low level. The application utilizes the voltage comparator to control the enabling end of the DC-DC chip so as to realize the under-voltage protection, and the power consumption of the DC-DC chip is extremely low at the moment, so that the application method is suitable for use scenes with extremely high requirements on the power consumption.

Description

Power supply control circuit and power supply device of DC-DC chip
Technical Field
The present disclosure relates to chip circuit design, and particularly to a power control circuit and a power device for a DC-DC chip.
Background
At present, mechanical engineering car is because long-term work is in field or building site, in order to keep on-vehicle battery not to be consumed to the unable start-up of engineering vehicle fast, engineering class vehicle has very high low-power consumption requirement to its on-vehicle electronic equipment who carries on, and requires the battery to accomplish very high precision detection. In a DC-DC voltage reduction chip provided by Texas instruments and instruments (TI) of America, TPS54360 has ultralow power consumption of 2.4uA for switching off, so that the requirement of low power consumption can be met, but in the actual design process, the consumption of each peripheral circuit is difficult to meet the requirement of implementation; meanwhile, the chip also needs to be started and stopped by high-precision Voltage within a certain range, namely, Under-Voltage Lock Out (UVLO) is actually set, but after UVLO is actually set, current consumption still exists in some UVLO logic circuits inside the chip, and the actual measurement reaches 60 uA. For a usage scenario with a high power consumption requirement, how to solve the technical problem, achieve low power consumption, and do not affect the UVLO function becomes a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power control circuit and a power device of a DC-DC chip with low power consumption and without affecting UVLO function. The specific scheme is as follows:
a power control circuit for a DC-DC chip, comprising:
the anode of the input power supply is connected with the power supply end of the DC-DC chip;
a first end of the first resistor is connected with the positive pole of the input power supply;
a first end of the second resistor is connected with a negative electrode of the input power supply, and a second end of the second resistor is connected with a second end of the first resistor;
a positive phase input end of the voltage comparator is connected with the second end of the first resistor, and an output end of the voltage comparator is connected with an enabling end of the DC-DC chip;
when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs a low level.
Preferably, the power control circuit of the DC-DC chip further includes:
a first end of the third resistor is connected with the anode of the input power supply, and a second end of the third resistor is connected with an enabling end of the DC-DC chip;
and a first end of the fourth resistor is connected with the negative electrode of the input power supply, and a second end of the fourth resistor is connected with a second end of the third resistor.
Preferably, the resistance values of the third resistor and the fourth resistor are respectively calculated by the following formulas:
Figure BDA0002511203060000021
Figure BDA0002511203060000022
wherein R is3And R4Respectively, the resistance values of the third resistor and the fourth resistor, VSTART、VSTOP、IHYS、VENA、I1The starting voltage, the closing voltage, the internal logic current, the enabling voltage and the internal logic circuit inherent current of the DC-DC chip are respectively.
Preferably, the power control circuit of the DC-DC chip further includes:
the cathode of the diode is connected with the positive phase input end of the voltage comparator;
and a first end of the fifth resistor is connected with the voltage output end of the DC-DC chip, and a second end of the fifth resistor is connected with the anode of the diode.
Preferably, the voltage comparator is a voltage comparator with a built-in reference source, and the reference source is used for providing a reference voltage of the voltage comparator.
Preferably, the voltage comparator is a voltage comparator of type TLV 6713.
Preferably, the DC-DC chip is specifically a TPS64360 power supply chip.
Accordingly, the present application discloses a power supply device including a DC-DC chip, comprising:
a DC-DC chip;
a power control circuit for a DC-DC chip as claimed in any preceding claim.
The application discloses power control circuit of DC-DC chip includes: the anode of the input power supply is connected with the power supply end of the DC-DC chip; a first end of the first resistor is connected with the positive pole of the input power supply; a first end of the second resistor is connected with a negative electrode of the input power supply, and a second end of the second resistor is connected with a second end of the first resistor; a positive phase input end of the voltage comparator is connected with the second end of the first resistor, and an output end of the voltage comparator is connected with an enabling end of the DC-DC chip; when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs a low level. The application utilizes the voltage comparator to control the enabling end of the DC-DC chip, once the voltage of the input power supply is lower than the starting voltage, the voltage comparator outputs a low level to close the DC-DC chip, so that the under-voltage protection of the DC-DC chip is realized, the power consumption of the DC-DC chip is extremely low at the moment, the power consumption of the whole power supply control circuit is far smaller than that of the prior art, the current consumption is reduced on the whole, the power supply control circuit is suitable for use scenes with extremely high requirements on the power consumption, and the power supply control circuit has the advantages of being good in economy and simple in circuit.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a diagram illustrating a structure of a power control circuit of a DC-DC chip according to an embodiment of the present disclosure;
FIG. 2 is a diagram illustrating an internal circuit of a TPS64360 power chip according to an embodiment of the present application;
fig. 3 is a diagram showing an internal circuit structure of the TLV6713 in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
DC-DC is a circuit arrangement that converts one voltage value into another voltage value in a direct current circuit. A DC-DC voltage reduction chip TPS54360 provided by Texas instruments and companies (TI) in America has the ultra-low power consumption of 2.4uA, and can meet the requirement of low power consumption, but in the actual design process, the consumption of each peripheral circuit is difficult to meet the requirement of realization; meanwhile, after the undervoltage Lock Out (UVLO) is actually set, some of its internal UVLO logic circuits still consume current, and the actual measurement reaches 60 uA. For a usage scenario with a high power consumption requirement, how to solve the technical problem, achieve low power consumption, and do not affect the UVLO function becomes a problem to be solved by those skilled in the art at present.
The application utilizes the voltage comparator to control the enabling end of the DC-DC chip, once the voltage of the input power supply is lower than the starting voltage, the voltage comparator outputs a low level to close the DC-DC chip, so that the under-voltage protection of the DC-DC chip is realized, the power consumption of the DC-DC chip is extremely low at the moment, the power consumption of the whole power supply control circuit is far smaller than that of the prior art, the current consumption is reduced on the whole, the power supply control circuit is suitable for use scenes with extremely high requirements on the power consumption, and the power supply control circuit has the advantages of being good in economy and simple in circuit.
The embodiment of the application discloses a power control circuit of a DC-DC chip, as shown in fig. 1, including:
the positive electrode of the input power supply V is connected with the power supply end of the DC-DC chip U1;
a first resistor R1, wherein a first end of the first resistor R1 is connected with the anode of the input power supply V;
a second resistor R2, wherein a first end of the second resistor R2 is connected with the negative pole of the input power supply V, and a second end of the second resistor R2 is connected with a second end of the first resistor R1;
a positive phase input end of the voltage comparator U2 is connected with a second end of the first resistor R1, and an output end of the voltage comparator U2 is connected with an enabling end of the DC-DC chip U1;
when the voltage of the input power V is lower than the start voltage of the DC-DC chip U1, the voltage of the non-inverting input terminal of the voltage comparator U2 is lower than the reference voltage thereof, so that the voltage comparator U2 outputs a low level.
In the embodiment, the power control circuit is used for low power consumption and voltage detection, and the DC-DC chip U1 to be controlled can be used for reducing voltage, for example, a TPS64360 power chip, and its internal circuit structure is as shown in fig. 2.
In this embodiment, the voltage comparator U2 may select a voltage comparator with a built-in reference source for providing a reference voltage of the voltage comparator, the voltage comparator U2 may be selected to have characteristics of high withstand voltage and low power consumption, and the voltage comparator with a model TLV6713 of TI may be selected, and its internal circuit structure is shown in fig. 3, its quiescent current is 7uA, accuracy is 0.75%, and the reference voltage of the built-in reference source is 400 mV.
In this embodiment, the input power source V may select a storage battery or other power sources, the first resistor R1 and the second resistor R2 are voltage dividing resistors, and are used to provide the voltage comparator U2 with the collected voltage of the input power source V, the precision of the two resistors is usually selected to be 0.1%, and the resistance value of the first resistor R1 is generally in the megaohm level. It can be understood that, since the sampling voltage is provided by the voltage dividing resistor, and the voltage at the positive input terminal of the voltage comparator U2 is equal to the reference voltage thereof when the voltage of the input voltage V is equal to the start voltage of the DC-DC chip U1 in combination with the low-level output condition of the voltage comparator U2, the voltage of the input power V and the start voltage of the DC-DC chip U1, the voltage at the positive input terminal of the voltage comparator U2 (the sampling voltage) and the reference voltage of the voltage comparator U2 in this embodiment have a definite proportional relationship between the two voltages, and taking the start voltage as 12.5V and the reference voltage as 400mV as an example, the following relationship exists between the resistance values corresponding to the first resistor R1 and the second resistor R2:
Figure BDA0002511203060000051
wherein R is1And R2The resistance values of the first resistor R1 and the second resistor R2 are respectively.
Further, in this embodiment, the power control circuit further includes:
a third resistor R3, wherein a first end of the third resistor R3 is connected with the anode of the input power supply V, and a second end of the third resistor R3 is connected with the enabling end of the DC-DC chip U1;
a fourth resistor R4, a first terminal of the fourth resistor R4 is connected to the negative terminal of the input power V, and a second terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3.
It can be understood that, at this time, the third resistor R3 and the fourth resistor R4 are actually UVLO voltage dividing resistors, and are used for setting the on-off voltage of the DC-DC chip U1, that is, determining the corresponding voltage values of the DC-DC chip during the on-off process. In addition, the third power supply R3 may also provide an open drain pull-up of the voltage comparator U2.
Further, the resistances of the third resistor R3 and the fourth resistor R4 are respectively calculated by the following formulas:
Figure BDA0002511203060000052
Figure BDA0002511203060000053
wherein R is3And R4The resistance values V of the third resistor R3 and the fourth resistor R4 are respectivelySTART、VSTOP、IHYS、VENA、I1The starting voltage, the closing voltage, the internal logic current, the enabling voltage and the internal logic circuit intrinsic current of the DC-DC chip U1 are respectively.
Further, in this embodiment, the power control circuit further includes:
the cathode of the diode D is connected with the non-inverting input end of the voltage comparator U2;
and a first end of the fifth resistor R5, a first end of the fifth resistor R5 is connected with a voltage output end of the DC-DC chip U1, and a second end of the fifth resistor R5 is connected with an anode of the diode D.
It will be appreciated that the diode D can isolate different voltages and prevent current from flowing backwards, the fifth resistor R5 has a current limiting function, and the resistance is usually in the order of 100k Ω, and can be combined with the second resistor R2 to form a voltage divider circuit. The diode D is combined with the fifth resistor R5, and mainly functions to output a locking voltage, so as to prevent the enable terminal of the DC-DC chip U1 from being pulled low when the voltage of the input power V falls below the voltage comparator U2.
Taking the DC-DC chip U1 as an example of the TPS64360 power chip, the working principle of the circuit in this embodiment is as follows:
when the DC-DC chip U1 is powered on for the first time, the voltage of an input power supply V is connected to a power supply control circuit and rises slowly, before the voltage of the input voltage V reaches the starting voltage, the voltage comparator U2 outputs a low level, the enable end EN pin of the DC-DC chip U1 is pulled down to zero, at the moment, the DC-DC chip U1 belongs to a shutdown state, the power consumption is 2.4uA, the voltage output of the DC-DC chip U1 is 0, no voltage feedback is generated by the diode D and the fifth resistor R5, and the voltage comparator U2 continuously pulls down the enable end of the DC-DC chip U1. The total current consumption of the whole peripheral circuit is UV/(R1+R2)+UV/R3+ Iq +2.4 uA; wherein U isVFor the voltage of the input power supply V, Iq is the self-loss current of the voltage comparator U2, TLV6713 measures the current value to be 0.7uA if UV＝12.5V，R1＝2MΩ，R3Since the resistance value of the second resistor R2 is too small, the current consumption can be ignored, where R is 1.3M Ω1+R2Can be directly substituted by R1The total power consumption of the DC-DC chip U1 and the power supply control circuit is about 25.3uA through calculation, and is reduced by only 60% compared with the power consumption of 60uA of the non-turned-off UVLO logic circuit.
When the voltage of the input power supply V rises to the starting voltage, the voltage comparator U2 outputs a high level, and the DC-DC chip U1 starts to operate.
When the voltage state of the input power V drops, the output voltage of the DC-DC chip U1 is fed back to the voltage comparator U2 through the diode D and the fifth resistor R5, so that the voltage at the non-inverting input terminal of the voltage comparator U2 is greater than the acquisition voltage. By this feedback action, even if the voltage of the input power V drops back below the start voltage, the voltage at the non-inverting input terminal of the voltage comparator U2 is not immediately lower than the reference value thereof, and the voltage comparator U2 does not immediately output a low level to turn off the DC-DC chip U1, thereby achieving a hysteresis turn-off. Until the input power V is lowered to a certain value, the voltage at the non-inverting input of the voltage comparator U2 is lower than 400mV, and the voltage comparator U2 will not output low and turn off the DC-DC chip U1.
When the DC-DC chip U1 is turned off, the output feedback of the diode D and the fifth resistor R5 disappears.
In the whole control process, the low-power consumption comparator is used for controlling the enabling of the DC-DC chip, the output feedback delay of the DC-DC chip is used for closing, and the voltage window delay is realized while the low-voltage switch-off is realized.
The embodiment of the application discloses power control circuit of DC-DC chip includes: the anode of the input power supply is connected with the power supply end of the DC-DC chip; a first end of the first resistor is connected with the positive pole of the input power supply; a first end of the second resistor is connected with a negative electrode of the input power supply, and a second end of the second resistor is connected with a second end of the first resistor; a positive phase input end of the voltage comparator is connected with the second end of the first resistor, and an output end of the voltage comparator is connected with an enabling end of the DC-DC chip; when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs a low level. The application utilizes the voltage comparator to control the enabling end of the DC-DC chip, once the voltage of the input power supply is lower than the starting voltage, the voltage comparator outputs a low level to close the DC-DC chip, so that the under-voltage protection of the DC-DC chip is realized, the power consumption of the DC-DC chip is extremely low at the moment, the power consumption of the whole power supply control circuit is far smaller than that of the prior art, the current consumption is reduced on the whole, the power supply control circuit is suitable for use scenes with extremely high requirements on the power consumption, and the power supply control circuit has the advantages of being good in economy and simple in circuit.
Accordingly, the present application discloses a power supply device including a DC-DC chip, comprising:
a DC-DC chip;
and a power supply control circuit of the DC-DC chip.
Wherein, the power control circuit of DC-DC chip includes:
the anode of the input power supply is connected with the power supply end of the DC-DC chip;
a first end of the first resistor is connected with the positive pole of the input power supply;
a first end of the second resistor is connected with a negative electrode of the input power supply, and a second end of the second resistor is connected with a second end of the first resistor;
a positive phase input end of the voltage comparator is connected with the second end of the first resistor, and an output end of the voltage comparator is connected with an enabling end of the DC-DC chip;
when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs a low level.
In some specific embodiments, the power control circuit of the DC-DC chip further includes:
a first end of the third resistor is connected with the anode of the input power supply, and a second end of the third resistor is connected with an enabling end of the DC-DC chip;
and a first end of the fourth resistor is connected with the negative electrode of the input power supply, and a second end of the fourth resistor is connected with a second end of the third resistor.
In some specific embodiments, the resistance values of the third resistor and the fourth resistor are respectively calculated by the following formulas:
Figure BDA0002511203060000081
Figure BDA0002511203060000082
wherein R is3And R4Respectively, the resistance values of the third resistor and the fourth resistor, VSTART、VSTOP、IHYS、VENA、RUVLO、I1The starting voltage, the closing voltage, the internal logic current, the enabling voltage and the internal logic circuit intrinsic current of the DC-DC chip U1 are respectively.
In some specific embodiments, the power control circuit of the DC-DC chip further includes:
the cathode of the diode is connected with the positive phase input end of the voltage comparator;
and a first end of the fifth resistor is connected with the voltage output end of the DC-DC chip, and a second end of the fifth resistor is connected with the anode of the diode.
In some specific embodiments, the voltage comparator is a voltage comparator with a built-in reference source, and the reference source is used for providing a reference voltage of the voltage comparator.
In some specific embodiments, the voltage comparator is specifically a model TLV6713 voltage comparator.
In some specific embodiments, the DC-DC chip is specifically a TPS64360 power chip.
The application utilizes the voltage comparator to control the enabling end of the DC-DC chip, once the voltage of the input power supply is lower than the starting voltage, the voltage comparator outputs a low level to close the DC-DC chip, so that the under-voltage protection of the DC-DC chip is realized, the power consumption of the DC-DC chip is extremely low at the moment, the power consumption of the whole power supply control circuit is far smaller than that of the prior art, the current consumption is reduced on the whole, the power supply control circuit is suitable for use scenes with extremely high requirements on the power consumption, and the power supply control circuit has the advantages of being good in economy and simple in circuit.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The power control circuit and the power device of the DC-DC chip provided by the present application are introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (8)

1. A power control circuit for a DC-DC chip, comprising:
the anode of the input power supply is connected with the power supply end of the DC-DC chip;
a first end of the first resistor is connected with the positive pole of the input power supply;
a first end of the second resistor is connected with a negative electrode of the input power supply, and a second end of the second resistor is connected with a second end of the first resistor;
a positive phase input end of the voltage comparator is connected with the second end of the first resistor, and an output end of the voltage comparator is connected with an enabling end of the DC-DC chip;
when the voltage of the input power supply is lower than the starting voltage of the DC-DC chip, the voltage of the non-inverting input end of the voltage comparator is lower than the reference voltage of the voltage comparator, so that the voltage comparator outputs a low level.
2. The power control circuit of the DC-DC chip according to claim 1, further comprising:
a first end of the third resistor is connected with the positive electrode of the input power supply, and a second end of the third resistor is connected with the enabling end of the DC-DC chip;
and a first end of the fourth resistor is connected with the negative electrode of the input power supply, and a second end of the fourth resistor is connected with a second end of the third resistor.
3. The power control circuit of the DC-DC chip according to claim 2, wherein the resistances of the third resistor and the fourth resistor are respectively calculated by the following formulas:
Figure FDA0002511203050000011
Figure FDA0002511203050000012
wherein R is3And R4Respectively, the resistance values of the third resistor and the fourth resistor, VSTART、VSTOP、IHYS、VENA、I1The starting voltage, the closing voltage, the internal logic current, the enabling voltage and the internal logic circuit inherent current of the DC-DC chip are respectively.
4. The power control circuit of a DC-DC chip according to any one of claims 1 to 3, further comprising:
the cathode of the diode is connected with the positive phase input end of the voltage comparator;
a fifth resistor, a first end of the fifth resistor being connected to the voltage output terminal of the DC-DC chip, and a second end of the fifth resistor being connected to the anode of the diode.
5. The power control circuit of the DC-DC chip according to claim 4, wherein the voltage comparator is a voltage comparator with a built-in reference source, and the reference source is used for providing a reference voltage of the voltage comparator.
6. The power control circuit of the DC-DC chip according to claim 5, wherein the voltage comparator is a type TLV6713 voltage comparator.
7. The power control circuit of the DC-DC chip of claim 6, wherein the DC-DC chip is a TPS64360 power chip.
8. A power supply device including a DC-DC chip, comprising:
a DC-DC chip;
a power control circuit of a DC-DC chip as claimed in any one of claims 1 to 7.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000004537A (en) * 1998-06-15 2000-01-07 Oki Electric Ind Co Ltd Power-supply start/stop circuit
JP2010140113A (en) * 2008-12-09 2010-06-24 Onkyo Corp Power source circuit
CN202043032U (en) * 2011-05-19 2011-11-16 深圳市振华微电子有限公司 Micropower starting circuit of switching power supply
CN202663093U (en) * 2012-06-19 2013-01-09 漳州耐欧立斯科技有限责任公司 Battery protection and windy self-starting circuit of off-grid wind power generation system
CN104682685A (en) * 2013-11-28 2015-06-03 西安国龙竹业科技有限公司 Power supply under-voltage protection circuit of isolating switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000004537A (en) * 1998-06-15 2000-01-07 Oki Electric Ind Co Ltd Power-supply start/stop circuit
JP2010140113A (en) * 2008-12-09 2010-06-24 Onkyo Corp Power source circuit
CN202043032U (en) * 2011-05-19 2011-11-16 深圳市振华微电子有限公司 Micropower starting circuit of switching power supply
CN202663093U (en) * 2012-06-19 2013-01-09 漳州耐欧立斯科技有限责任公司 Battery protection and windy self-starting circuit of off-grid wind power generation system
CN104682685A (en) * 2013-11-28 2015-06-03 西安国龙竹业科技有限公司 Power supply under-voltage protection circuit of isolating switch

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