CN117559769B - Chip internal voltage generation circuit of external power supply - Google Patents
Chip internal voltage generation circuit of external power supply Download PDFInfo
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- CN117559769B CN117559769B CN202410045785.8A CN202410045785A CN117559769B CN 117559769 B CN117559769 B CN 117559769B CN 202410045785 A CN202410045785 A CN 202410045785A CN 117559769 B CN117559769 B CN 117559769B
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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
- H02M1/0003—Details of control, feedback or regulation circuits
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The embodiment of the invention discloses a chip internal voltage generating circuit of an external power supply, which is characterized in that a current generating circuit, an external power supply detecting circuit and an output circuit are arranged, the current generating circuit provides a foundation for the operation of the external power supply detecting circuit and the output circuit, the fifth end of the external power supply detecting circuit can be connected with the external power supply, when the current generating circuit is conducted and the external power supply detecting circuit detects that the external power supply is connected, the chip internal voltage generating circuit of the external power supply can output the voltage value of the external power supply, and the voltage value can be any value within a preset range, so that the chip internal voltage generating circuit obtains different output voltages, and the external power supply generating circuit is suitable for a switch power supply circuit of multiple scenes.
Description
Technical Field
The invention relates to the technical field of battery charging, in particular to a chip internal voltage generation circuit of an external power supply.
Background
The switching power supply circuit in the prior art generally includes a power circuit and an integrated circuit control chip, and the supply voltage or reference voltage of each module inside the integrated circuit control chip is generally directly generated by an internal chip voltage generating circuit, as shown in fig. 1, which is the internal chip voltage generating circuit in the prior art. As can be seen from fig. 1, the internal voltage generating circuit in the prior art takes the internal power supply VDD as input, and obtains the corresponding output voltage VOUT1 through the cooperation of the operational amplifier U1 and the twenty-second switching tube M22.
However, since the power supply VDD inside the chip is usually a fixed value, the output voltage VOUT1 is also a fixed value at this time, and when the chip is used in a switching power supply circuit of different application scenarios, different power supply voltages or reference voltages are required for each module inside the chip, so that the internal voltage generating circuit of the chip in the prior art cannot be applied to a switching power supply circuit of multiple scenarios.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a chip internal voltage generating circuit of an external power supply, so as to solve the technical problem that the chip internal voltage generating circuit in the prior art cannot be applied to a multi-scene switching power supply circuit.
The technical scheme provided by the embodiment of the invention is as follows:
a first aspect of an embodiment of the present invention provides a chip internal voltage generating circuit of an external power supply, including: a current generation circuit, an external power supply detection circuit, and an output circuit;
the first end of the current generating circuit is connected with the internal power supply of the chip, the second end of the current generating circuit is grounded, the third end of the current generating circuit is connected with the first end of the external power supply detection circuit, the fourth end of the current generating circuit is connected with the first end of the output circuit, and the current generating circuit is used for conducting work according to the voltage provided by the internal power supply of the chip after the chip is electrified;
The second end of the external power supply detection circuit is connected with an internal power supply of the chip, the third end of the external power supply detection circuit is connected with a reference voltage, the fourth end of the external power supply detection circuit is connected with the second end of the output circuit, the fifth end of the external power supply detection circuit is connected with the third end of the output circuit and an external power supply, the sixth end of the external power supply detection circuit is grounded, the external power supply detection circuit is used for detecting that the external power supply is connected after the chip is electrified, and when the connected external power supply is larger than a preset multiple of the reference voltage, a low-level signal is generated according to the voltage of the external power supply, the reference voltage and the current generation circuit which conducts work;
the fourth end of the output circuit is connected with the internal power supply of the chip, the fifth end of the output circuit is grounded, the sixth end of the output circuit is connected with the output end, and the output circuit is used for outputting the voltage value of the external power supply according to the low-level signal and the current generating circuit which conducts when the connected external power supply is larger than the preset multiple of the reference voltage, wherein the voltage value of the external power supply is any value in the preset range.
In an optional implementation manner, the external power supply detection circuit is further used for generating a high-level signal according to the reference voltage and the current generation circuit which conducts work when the external power supply is powered on and the external power supply which is not connected or connected with the external power supply is smaller than a preset multiple of the reference voltage; the output circuit is also used for outputting non-working voltage according to the high-level signal and the current generating circuit conducting the working when the external power supply is not connected or connected is smaller than the preset multiple of the reference voltage.
In an alternative embodiment, the current generating circuit includes a current source, a first switching tube, a second switching tube, and a nineteenth switching tube; one end of the current source is connected with the internal power supply of the chip, the other end of the current source is connected with the first end of the first switching tube, the second end of the first switching tube, the first end of the second switching tube and the first end of the nineteenth switching tube, the third end of the first switching tube is connected with the second end of the second switching tube, the second end of the nineteenth switching tube is grounded, the third end of the second switching tube is connected with the first end of the external power supply detection circuit, and the third end of the nineteenth switching tube is connected with the first end of the output circuit.
In an alternative embodiment, the external power supply detection circuit includes a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube, a first resistor, a second resistor, and a first inverter;
the first end of the fifth switch tube is connected with the first end of the ninth switch tube and the third end of the current generation circuit, the second end of the fifth switch tube is connected with the reference voltage, the third end of the fifth switch tube is connected with the first end of the fourth switch tube, the second end of the fourth switch tube and the first end of the third switch tube, the second end of the third switch tube is connected with the third end of the fourth switch tube, the first end of the sixth switch tube, the first end of the seventh switch tube and the power supply inside the chip, the third end of the third switch tube is connected with the first end of the tenth switch tube, the second end of the third switch tube and the first end of the eleventh switch tube, the third end of the tenth switch tube is connected with the second end of the eleventh switch tube, one end of the second resistor is grounded, the second end of the ninth switch tube is connected with the other end of the second resistor and one end of the first resistor, the third end of the third switch tube is connected with the third end of the seventh switch tube, the third end of the third switch tube and the third end of the seventh switch tube, the third end of the third switch tube is connected with the third end of the eleventh switch tube, the third end of the third switch tube is connected with the third end of the third switch tube and the other end of the third end of the eleventh switch tube, and the output of the eleventh switch tube is connected with the third end of the inverter, and the third end of the output of the eleventh switch is connected with the output of the third end and the power supply.
In an alternative embodiment, the output circuit includes a second inverter, a third inverter, a fourth inverter, a zener diode, a first capacitor, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube, a twentieth switching tube, and a twenty first switching tube;
one end of the second inverter is connected with the fourth end of the external power supply detection circuit, the other end of the second inverter is connected with one end of the third inverter and the first end of the seventeenth switching tube, the other end of the third inverter is connected with the first end of the sixteenth switching tube, the second end of the sixteenth switching tube is connected with the second end of the seventeenth switching tube and grounded, the third end of the sixteenth switching tube is connected with one end of the fourth inverter, the first end of the fourteenth switching tube and the first end of the fifteenth switching tube, the third end of the seventeenth switching tube is connected with the second end of the fourteenth switching tube and the second end of the fifteenth switching tube, the third end of the fourteenth switching tube is connected with the third end of the seventeenth switching tube, the cathode of the zener diode, one end of the first capacitor, the first end of the third twenty first switching tube and the output end of the twenty first switching tube, the third end of the eighteenth switching tube is connected with the second end of the eighteenth switching tube, the third end of the eighteenth switching tube is connected with the external power supply detection circuit and the external power supply, the first end of the twenty-fourth switching tube is connected with the twenty-third end of the twenty-first switching tube and the twenty-third end of the twenty-third switching tube.
In an alternative embodiment, the on-chip voltage generation circuit further includes: a first hysteresis circuit and a second hysteresis circuit;
the first end of the first hysteresis circuit is connected with an internal power supply of the chip, the second end of the first hysteresis circuit is connected with the second end of the seventh switching tube, the third end of the first hysteresis circuit is connected with the third end of the seventh switching tube, and the fourth end of the first hysteresis circuit is connected with the first end of the second hysteresis circuit and the other end of the first inverter;
the second end of the second hysteresis circuit is grounded, and the third end of the second hysteresis circuit is connected with one end of the second resistor;
the first hysteresis circuit and the second hysteresis circuit are used for switching the state repeatedly when the external power supply connected after the chip is electrified is larger than the preset multiple of the reference voltage and if the external power supply fluctuates near the preset multiple of the reference voltage, the voltage output by the output end cannot be switched repeatedly.
In an alternative embodiment, the first hysteresis circuit includes an eighth switching tube and a twelfth switching tube, and the second hysteresis circuit includes a third resistor and a thirteenth switching tube;
the first end of the eighth switching tube is connected with the power supply inside the chip, the second end of the eighth switching tube is connected with the second end of the seventh switching tube, the third end of the eighth switching tube is connected with the first end of the twelfth switching tube, the second end of the twelfth switching tube is connected with the third end of the seventh switching tube, and the third end of the twelfth switching tube is connected with the other end of the first inverter and the first end of the thirteenth switching tube;
One end of the third resistor is connected with one end of the second resistor and the second end of the thirteenth switching tube, and the other end of the third resistor is connected with the third end of the thirteenth switching tube and grounded.
In an alternative embodiment, the arbitrary value within the preset range is an arbitrary value between a preset multiple of the reference voltage and a first voltage, the first voltage being a smaller value of a sum of an operating voltage of the internal power supply of the chip and a forward turn-on voltage of the body diode of the twenty-first switching transistor and a reverse breakdown voltage of the zener diode; the preset multiple is determined by the ratio of the sum of the resistance values of the first resistor and the second resistor to the resistance value of the second resistor.
In an alternative embodiment, the non-operating voltage is the smaller of the operating voltage of the power supply internal to the chip and the reverse breakdown voltage of the zener diode; when the connected external power supply is smaller than the preset multiple of the reference voltage, the preset multiple of the reference voltage is smaller than the second voltage, and the second voltage is a smaller value of the sum of the working voltage of the internal power supply of the chip and the forward conduction voltage of the body diode of the eighteenth switching tube, and the sum of the reverse breakdown voltage of the zener diode and the forward conduction voltage of the body diode of the eighteenth switching tube.
A second aspect of an embodiment of the present invention provides an integrated circuit control chip, including: the first aspect of the embodiments of the present invention and the internal voltage generating circuit of the external power supply of any one of the first aspect.
A third aspect of an embodiment of the present invention provides a switching power supply circuit, including: the integrated circuit control chip of the second aspect of the embodiment of the invention.
In an alternative embodiment, a switching power supply circuit is used to charge a battery.
The technical scheme of the invention has the following advantages:
according to the chip internal voltage generation circuit of the external power supply, provided by the embodiment of the invention, the current generation circuit, the external power supply detection circuit and the output circuit are arranged, the current generation circuit provides a foundation for the operation of the external power supply detection circuit and the output circuit, the fifth end of the external power supply detection circuit can be connected with the external power supply, when the current generation circuit is conducted and operated, and the external power supply detection circuit detects that the external power supply is connected, the chip internal voltage generation circuit of the external power supply can output the voltage value of the external power supply, and the voltage value can be any value within a preset range, so that the chip internal voltage generation circuit obtains different output voltages, and the chip internal voltage generation circuit is suitable for a switch power supply circuit of multiple scenes.
According to the chip internal voltage generation circuit of the external power supply, provided by the embodiment of the invention, the first hysteresis circuit and the second hysteresis circuit are arranged, so that the output voltage can not be switched repeatedly when the external power supply fluctuates around the preset multiple of the reference voltage, and the safety and the reliability of the chip internal voltage generation circuit of the external power supply are improved.
The chip internal voltage generating circuit of the external power supply provided by the embodiment of the invention has the advantages that the current capacity of the output voltage is provided by the external power supply, so that the internal power consumption of the chip during working can be greatly reduced, and the power consumption of the switching power supply circuit is reduced.
The switching power supply circuit provided by the embodiment comprises the integrated circuit control chip with the chip internal voltage generation circuit of the external power supply, and realizes the output of any voltage value in a preset range, so that the switching power supply circuit can be used in different scenes, and the application range of the switching power supply circuit is enlarged.
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 needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an internal voltage generation circuit of a chip in the prior art;
FIG. 2 is a block diagram of an internal voltage generating circuit of a chip with an external power supply according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an internal voltage generating circuit of a chip with an external power supply according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an internal voltage generating circuit of a chip with an external power supply according to an embodiment of the present invention;
FIG. 5 is a block diagram of an integrated circuit control chip according to an embodiment of the present invention;
fig. 6 is a block diagram of a switching power supply circuit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. 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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention provides a chip internal voltage generation circuit of an external power supply VIN, as shown in FIG. 2, the voltage generation circuit comprises: a current generation circuit 100, an external power supply detection circuit 200, and an output circuit 300.
The first end of the current generation circuit 100 is connected to the chip internal power supply VDD, the second end of the current generation circuit 100 is grounded, the third end of the current generation circuit 100 is connected to the first end of the external power supply detection circuit 200, the fourth end of the current generation circuit 100 is connected to the first end of the output circuit 300, and the current generation circuit 100 is configured to conduct according to the voltage provided by the chip internal power supply VDD after the chip is powered on.
The second end of the external power supply detection circuit 200 is connected with the chip internal power supply VDD, the third end of the external power supply detection circuit 200 is connected with the reference voltage VREF, the fourth end of the external power supply detection circuit 200 is connected with the second end of the output circuit 300, the fifth end of the external power supply detection circuit 200 is connected with the third end of the output circuit 300 and the external power supply VIN, the sixth end of the external power supply detection circuit 200 is grounded, the external power supply detection circuit 200 is used for detecting that the external power supply VIN is connected after the chip is powered on, and when the connected external power supply VIN is larger than a preset multiple of the reference voltage VREF, a low-level signal is generated according to the voltage of the external power supply VIN, the reference voltage VREF and the current generation circuit 100 which conducts operation.
The fourth end of the output circuit 300 is connected to the chip internal power supply VDD, the fifth end of the output circuit 300 is grounded, the sixth end of the output circuit 300 is connected to the output end, and the output circuit 300 is configured to output a voltage value of the external power supply VIN according to the low-level signal and the current generating circuit 100 that is turned on when the connected external power supply VIN is greater than a preset multiple of the reference voltage VREF, where the voltage value of the external power supply VIN is an arbitrary value within a preset range.
The internal voltage generating circuit of the chip of the external power supply provided by the embodiment of the invention is provided with the current generating circuit, the external power supply detection circuit and the output circuit, the current generating circuit provides a foundation for the operation of the external power supply detection circuit and the output circuit, the fifth end of the external power supply detection circuit can be connected with the external power supply, when the current generating circuit is conducted and operated, and the external power supply detection circuit detects that the external power supply is connected, the internal voltage generating circuit of the chip of the external power supply can output the voltage value of the external power supply, and the voltage value can be any value within a preset range, so that the internal voltage generating circuit of the chip can obtain different output voltages, and the internal voltage generating circuit is suitable for the switch power supply circuit of multiple scenes.
In an alternative embodiment, current generation circuit 100 includes a current source B1, a first switching tube M1, a second switching tube M2, and a nineteenth switching tube M19; one end of the current source B1 is connected with the chip internal power supply VDD, the other end of the current source B1 is connected with the first end of the first switch tube M1, the second end of the first switch tube M1, the first end of the second switch tube M2 and the first end of the nineteenth switch tube M19, the third end of the first switch tube M1 is connected with the second end of the second switch tube M2, the second end of the nineteenth switch tube M19 is grounded, the third end of the second switch tube M2 is connected with the first end of the external power supply detection circuit 200, and the third end of the nineteenth switch tube M19 is connected with the first end of the output circuit 300.
Specifically, after the chip is powered on, the power supply VDD inside the chip is connected to the voltage generating circuit, the current source B1 generates a first current I1, and at this time, the first current I1 pulls up the voltages of the control ends of the first switching tube M1, the second switching tube M2 and the nineteenth switching tube M19, and the first switching tube M1, the second switching tube M2 and the nineteenth switching tube M19 are turned on.
As shown in fig. 3, in an alternative embodiment, the external power supply detection circuit includes a third switching tube M3, a fourth switching tube M4, a fifth switching tube M5, a sixth switching tube M6, a seventh switching tube M7, a ninth switching tube M9, a tenth switching tube M10, an eleventh switching tube M11, a first resistor R1, a second resistor R2, and a first inverter A1.
The first end of the fifth switching tube M5 is connected with the first end of the ninth switching tube M9 and the third end of the current generating circuit, the second end of the fifth switching tube M5 is connected with the reference voltage, the third end of the fifth switching tube M5 is connected with the first end of the fourth switching tube M4, the second end of the fourth switching tube M4 and the first end of the third switching tube M3, the second end of the third switching tube M3 is connected with the third end of the fourth switching tube M4, the first end of the sixth switching tube M6, the first end of the seventh switching tube M7 and the power supply inside the chip, the third end of the third switching tube M3 is connected with the first end of the tenth switching tube M10, the second end of the tenth switching tube M10 and the first end of the eleventh switching tube M11, the third end of the tenth switch tube M10 is connected with the second end of the eleventh switch tube M11, one end of the second resistor R2 and the ground, the second end of the ninth switch tube M9 is connected with the other end of the second resistor R2 and one end of the first resistor R1, the third end of the ninth switch tube M9 is connected with the second end of the sixth switch tube M6, the third end of the sixth switch tube M6 and the second end of the seventh switch tube M7, the third end of the seventh switch tube M7 is connected with the third end of the eleventh switch tube M11 and one end of the first inverter A1, the other end of the first inverter A1 is connected with the second end of the output circuit, and the other end of the first resistor R1 is connected with the third end of the output circuit and an external power supply. The reference voltage VREF is generated by the chip internal power supply VDD.
The output circuit includes a second inverter A2, a third inverter A3, a fourth inverter A4, a zener diode Z1, a first capacitor C1, a fourteenth switching tube M14, a fifteenth switching tube M15, a sixteenth switching tube M16, a seventeenth switching tube M17, an eighteenth switching tube M18, a twentieth switching tube M20, and a twenty-first switching tube M21.
One end of the second inverter A2 is connected with the fourth end of the external power supply detection circuit, the other end of the second inverter A2 is connected with one end of the third inverter A3 and the first end of the seventeenth switching tube M17, the other end of the third inverter A3 is connected with the first end of the sixteenth switching tube M16, the second end of the sixteenth switching tube M16 is connected with the second end of the seventeenth switching tube M17 and grounded, the third end of the sixteenth switching tube M16 is connected with one end of the fourth inverter A4, the first end of the fourteenth switching tube M14 and the first end of the fifteenth switching tube M15, the third end of the seventeenth switching tube M17 is connected with the second end of the fourteenth switching tube M14 and the third end of the seventeenth switching tube M15, the third end of the fourteenth switching tube M14 is connected with the third end of the seventeenth switching tube M15, the third end of the eighteenth switching tube M18, the cathode of the first capacitor C1, the first end of the twenty-first switching tube M21 and the output end of the twenty-fourth switching tube M16, the third end of the twenty-fourth inverter A4 is connected with the third end of the twenty-third switching tube M18 and the twenty-third end of the twenty-third switching tube M20, and the twenty-third end of the twenty-third switching tube M20 is connected with the twenty-third end of the twenty-third switching tube 20, and the twenty-third end of the twenty-third switching tube 20 is connected with the third end of the inside of the twenty-third switching tube M20.
The external power supply detection circuit 200 is configured to generate a high-level signal according to the reference voltage VREF and the current generation circuit 100 that is turned on when the external power supply VIN is not connected after the chip is powered on; the output circuit 300 is further configured to output a non-operating voltage according to the high signal and the current generating circuit 100 that is turned on when the external power source VIN is not connected.
Specifically, based on the above-mentioned external power supply detection circuit and output circuit structure, after the chip is powered on, the reference voltage VREF is input to the control terminal of the fifth switching tube M5, the fifth switching tube M5 is turned on, at this time, the voltages of the control terminals of the third switching tube M3 and the fourth switching tube M4 are pulled down by the fifth switching tube M5 and the second switching tube M2, and the third switching tube M3 and the fourth switching tube M4 are turned on, so that the current flows in the branch circuit formed by the fourth switching tube M4, the fifth switching tube M5 and the second switching tube M2; the control terminal voltages of the tenth switching transistor M10 and the eleventh switching transistor M11 are pulled up by the third switching transistor M3, and the tenth switching transistor M10 and the eleventh switching transistor M11 are turned on, so that at this time, a current flows in the branch circuit constituted by the third switching transistor M3 and the tenth switching transistor M10, and at the same time, the tenth switching transistor M10 and the eleventh switching transistor M11 constitute a current mirror structure, so that a point a pull-down current is generated in the eleventh switching transistor M11, and the point a voltage is pulled down.
Therefore, when the chip is powered on and the external power supply VIN is not connected to the voltage generating circuit, the voltage at the point a is low, the voltage at the point B of the output end of the first inverter A1 is high, the voltage at the point C of the output end of the second inverter A2 is low, so that at this time, the third inverter A3 outputs a high level to the control end of the sixteenth switching tube M16, the voltage at the point C of the low level is input to the control end of the seventeenth switching tube M17, the sixteenth switching tube M16 is turned on, the seventeenth switching tube M17 is turned off, so that the control end of the fifteenth switching tube M15 is pulled down by the sixteenth switching tube M16, the fifteenth switching tube M15 is turned on, at this time, the control end of the fourteenth switching tube M14 is pulled down by the fifteenth switching tube M15, and the fourteenth switching tube M14 is turned off because the voltage at the current input end of the fourteenth switching tube M14 is also the output voltage VOUT, and the sixteenth switching tube M18 is turned off because the voltage at the point D is pulled down by the sixteenth switching tube M16, so that the fourth inverter A4 outputs a high level, and the eighteenth switching tube M18 is turned off; meanwhile, since the nineteenth switching transistor M19 pulls down the control terminal voltages of the twentieth switching transistor M20 and the twenty-first switching transistor M21, at this time, the twentieth switching transistor M20 and the twenty-first switching transistor M21 are turned on, and thus, a current is generated in a branch constituted by the current input terminal of the chip internal power supply VDD-the twenty-first switching transistor M21-the fifteenth switching transistor M15-the control terminal of the fifteenth switching transistor M15-the sixteenth switching transistor M16-GND, the output voltage VOUT is clamped at the non-operating voltage VDDH or VZ, where VDDH is the operating voltage of the chip internal power supply VDD, VZ is the reverse breakdown voltage of the zener diode Z1, specifically, when VDDH is greater than VZ, the output voltage VOUT is clamped at the non-operating voltage VDDH, when VDDH is less than VZ; i.e. the non-operating voltage is the smaller of the operating voltage of the power supply inside the chip and the reverse breakdown voltage of the zener diode.
The external power supply detection circuit 200 is further configured to generate a high-level signal according to the reference voltage VREF and the current generation circuit 100 that is turned on when the external power supply VIN is connected to the chip after the chip is powered on and is less than a preset multiple of the reference voltage VREF; the output circuit 300 is further configured to output a non-operating voltage according to the high-level signal and the current generating circuit 100 that is turned on when the connected external power source VIN is smaller than a preset multiple of the reference voltage VREF.
Specifically, after the external power supply VIN is connected to the voltage generating circuit, the voltage division voltage is obtained at the point E through the first resistor R1 and the second resistor R2, so that the voltage at the point E pulls up the control terminal voltage of the ninth switching tube M9, the ninth switching tube M9 is turned on, then the control terminal voltages of the sixth switching tube M6 and the seventh switching tube M7 are pulled down through the ninth switching tube M9 and the second switching tube M2, and the sixth switching tube M6 and the seventh switching tube M7 are turned on, so that a current flows in a branch circuit formed by the sixth switching tube M6, the ninth switching tube M9 and the second switching tube M2, and meanwhile, since the sixth switching tube M6 and the seventh switching tube M7 form a current mirror structure, a point charging current is generated in the seventh switching tube M7, and the point a voltage is increased.
At this time, the current flowing through the fifth switching tube M5 is the second current, the current flowing through the ninth switching tube M9 is the third current, and at the same time, as can be seen from the structure of fig. 3, the second current flowing through the fifth switching tube M5=the current flowing through the third switching tube M3=the current flowing through the tenth switching tube M10=the current flowing through the eleventh switching tube M11=the point a pull-down current, the third current flowing through the ninth switching tube M9=the current flowing through the sixth switching tube M6=the current flowing through the seventh switching tube M7=the point a charging current.
E point voltage according to the voltage division of the first resistor R1 and the second resistor R2Thus, when the E-point voltage is smaller than the reference voltage VREF, i.e., when +.>When the voltage difference between the control end of the fifth switching tube M5 and the current output end is larger than the voltage difference between the control end of the ninth switching tube M9 and the current output end, the second current flowing through the fifth switching tube M5 is larger than the third current flowing through the ninth switching tube M9, namely, at the moment, the pull-down current at the point A is larger than the charging current at the point A, the point A is still in a low level, and the state of the circuit is kept before the circuit is connected to an external power supply VIN; at this time, in order to prevent the body diode of the eighteenth switching transistor M18 from being turned on, which affects the reliability of the circuit, it is necessary to add +. >Designed to be less than vout+vd18, where VD18 is the forward turn-on voltage of the body diode of the eighteenth switching transistor M18, VOUT is the smaller of VDDH and VZ, thus requiring that will beDesigned to be less than min->The method comprises the steps of carrying out a first treatment on the surface of the I.e. when the connected external power supply is smaller than the preset multiple of the reference voltage (/ ")>) Reference voltage +.>The preset multiple of (a) is smaller than the second voltage, and the second voltage is a smaller value of the sum of the operating voltage of the power supply VDD inside the chip and the forward conduction voltage of the body diode of the eighteenth switching tube M18 and the sum of the reverse breakdown voltage of the zener diode Z1 and the forward conduction voltage of the body diode of the eighteenth switching tube M18.
The external power supply detection circuit 200 is further configured to generate a low-level signal according to the voltage of the external power supply, the reference voltage and the current generating circuit that conducts when the external power supply VIN is detected to be connected after the chip is powered on and the connected external power supply VIN is greater than a preset multiple of the reference voltage VREF; the output circuit 300 is configured to output a voltage value of the external power source VIN according to the low-level signal and the current generating circuit 100 that is turned on when the connected external power source VIN is greater than a preset multiple of the reference voltage VREF, where the voltage value of the external power source VIN is an arbitrary value within a preset range.
Specifically, when the E-point voltage is greater than the reference voltage VREF, i.e., whenWhen the external power supply is connected with the current output end of the ninth switch tube M9, the voltage difference between the control end of the fifth switch tube M5 and the current output end is smaller than the voltage difference between the control end of the ninth switch tube M9 and the current output end, so that the second current flowing through the fifth switch tube M5 is smaller than the third current flowing through the ninth switch tube M9, namely, when the pull-down current at the point A is smaller than the charging current at the point A, the point A is converted into high level, the voltage at the output end B of the first inverter A1 is converted into low level, the voltage at the output end C of the second inverter A2 is converted into high level, and therefore, when the voltage at the point C of the high level is input to the control end of the seventeenth switch tube M17, the sixteenth switch tube M16 is turned off, the seventeenth switching transistor M17 is turned on, so that the control terminal voltage of the fourteenth switching transistor M14 is pulled down by the seventeenth switching transistor M17, the fourteenth switching transistor M14 is turned on, at this time, the control terminal of the fifteenth switching transistor M15 is pulled up to the output voltage VOUT by the fourteenth switching transistor M14, and since the voltage of the current input terminal of the fifteenth switching transistor M15 is also the output voltage VOUT, the fifteenth switching transistor M15 is turned off, at this time, the point D voltage is pulled up by the fourteenth switching transistor M14, so that the fourth inverter A4 outputs a low level, the eighteenth switching transistor M18 is turned on, the external power source VIN is connected to the output terminal through the eighteenth switching transistor M18, at this time, although a current is generated in a branch circuit constituted by the current input terminal of the chip internal power source VDD-twenty first switching transistor M21-fourteenth switching transistor M14 through the control terminal of the fourteenth switching transistor M14 through seventeenth switching transistor M17-GND, but the current is weak and is far smaller than the current generated by the external power supply VIN, so that the output voltage VOUT is clamped at the external power supply VIN and is The body diode of the twenty-first switch tube M21 is prevented from conducting to affect the reliability of the circuit, the external power supply VIN is required to be smaller than VDDH+VD, wherein VD is the forward conducting voltage of the body diode of the twenty-first switch tube M21, and meanwhile, in order to prevent the reverse breakdown of the zener diode Z1 from affecting the reliability of the circuit, the external power supply VIN is required to be smaller than VZ, so that the external power supply VIN is available at the moment>It is also less than min%>. Namely when the connected external power source VIN is larger than the preset multiple of the reference voltage) When the voltage output by the output end is the voltage value of the external power supply VIN, the voltage value can be any value between the preset multiple of the reference voltage and the first voltage, and the first voltage is the working voltage of the power supply VDD inside the chipAnd the smaller of the sum of the forward conduction voltages of the body diodes of the twenty-first switching transistor M21 and the reverse breakdown voltage of the zener diode Z1.
In summary, when the external power supply VIN is not detected by the external power supply detection circuit, or the external power supplyWhen the voltage generating circuit is connected with the external power supply, the output voltage VOUT generated by the internal voltage generating circuit of the chip is equal to the working voltage of the power supply VDD in the chip or the reverse breakdown voltage of the zener diode Z1, and the output voltage VOUT has poor current capability and is a non-working voltage; when the external power supply detection circuit detects that the external power supply VIN is connected, and in order to prevent the voltage generation circuit from being triggered by mistake, the external power supply is connected >When the external power source is in operation, the chip internal voltage generating circuit of the external power source generates an output voltage VOUT which is equal to the external power source VIN, and at the moment, the output voltage is outputtedThe voltage VOUT can outputTo min->The voltage generating circuit in the chip obtains different output voltages by any value, so that the voltage generating circuit is suitable for a multi-scene switching power supply circuit; meanwhile, the current capacity of the output voltage VOUT is fully provided by the external power supply VIN, so that the internal power consumption of the chip during working can be greatly reduced.
In an alternative embodiment, to further improve the safety reliability of the voltage generation circuit, the on-chip voltage generation circuit further includes: a first hysteresis circuit 400 and a second hysteresis circuit 500; the first end of the first hysteresis circuit 400 is connected with an internal power supply of the chip, the second end of the first hysteresis circuit 400 is connected with the second end of the seventh switching tube, the third end of the first hysteresis circuit 400 is connected with the third end of the seventh switching tube, and the fourth end of the first hysteresis circuit 400 is connected with the first end of the second hysteresis circuit 500 and the other end of the first inverter; the second end of the second hysteresis circuit 500 is grounded, and the third end of the second hysteresis circuit 500 is connected with one end of the second resistor; the first hysteresis circuit 400 and the second hysteresis circuit 500 are used for switching the state of the voltage output by the output terminal VOUT repeatedly if the external power source VIN fluctuates around the preset multiple of the reference voltage when the external power source VIN connected to the chip is larger than the preset multiple of the reference voltage after the chip is powered on.
The first hysteresis circuit 400 includes an eighth switching tube M8 and a twelfth switching tube M12, and the second hysteresis circuit 500 includes a third resistor R3 and a thirteenth switching tube M13; the first end of the eighth switching tube M8 is connected with an internal power supply of the chip, the second end of the eighth switching tube M8 is connected with the second end of the seventh switching tube, the third end of the eighth switching tube M8 is connected with the first end of the twelfth switching tube M12, the second end of the twelfth switching tube M12 is connected with the third end of the seventh switching tube, and the third end of the twelfth switching tube M12 is connected with the other end of the first inverter and the first end of the thirteenth switching tube M13; one end of the third resistor R3 is connected with one end of the second resistor and the second end of the thirteenth switching tube M13, and the other end of the third resistor R3 is connected with the third end of the thirteenth switching tube M13 and grounded.
Specifically, the first hysteresis circuit 400 and the second hysteresis circuit 500 operate as follows: after the chip is powered on, the power supply VDD inside the chip is connected to the voltage generating circuit, at this time, it is known from the above analysis that the voltage of the control end of the eighth switching tube M8 is pulled down by the ninth switching tube M9 and the second switching tube M2, the eighth switching tube M8 is turned on, and at the same time, when the chip is powered on and the external power supply VIN is not connected to the voltage generating circuit, the voltage at the point a is low, the voltage at the point B of the output end of the first inverter A1 is high, at this time, the twelfth switching tube M12 is turned off, and the thirteenth switching tube M13 is turned on.
When the external power VIN is connected to the voltage generation circuit, the voltage at E pointIs larger than the reference voltage VREF, namely the external power supply +.>When the charging current flowing into the point A from the seventh switching tube M7 is larger than the pull-down current flowing into the eleventh switching tube M11 from the point A, the point A is converted into a high level, the voltage of the point B at the output end of the first inverter A1 is converted into a low level, the twelfth switching tube M12 is turned on, the thirteenth switching tube M13 is turned off, and at the moment, the charging current flowing into the point A is generated by a branch circuit formed by the eighth switching tube M8 and the twelfth switching tube M12, so that the charging current of the point A is further ensured to be larger than the pull-down current of the point A, and the point A is ensured to be in a high level state; meanwhile, the third resistor R3 is connected into the circuit, so that only when the external power supply is connectedThe voltage generating circuit stops outputting when the external power source VIN is inWhen the voltage fluctuates nearby, the output voltage VOUT will not be caused to repeatedly switch states, so that the safety and reliability of the voltage generating circuit are improved.
It should be noted that, the switching transistors in the current generating circuit, the external power supply detecting circuit, the output circuit, the first hysteresis circuit and the second hysteresis circuit, that is, the switching transistors shown in fig. 3 and fig. 4 may be MOS transistors or corresponding transistors, and the specific type of the switching transistors is not limited in this embodiment.
As shown in fig. 5, an embodiment of the present invention further provides an integrated circuit control chip, including: the chip internal voltage generating circuit of the external power supply of the above embodiment. It should be noted that, in the integrated circuit control chip, besides the chip internal voltage generating circuit including the external power supply, other circuit structures capable of realizing the control function thereof may be set with reference to the related art, and the specific structure of the integrated circuit control chip is not limited in this embodiment.
As shown in fig. 6, an embodiment of the present invention further provides a switching power supply circuit, including: the integrated circuit control chip of the above embodiment. The switching power supply circuit is used for charging the battery. Specifically, the switching power supply circuit can further comprise a power circuit besides the integrated circuit control chip, so that the function of charging the battery is achieved.
The switching power supply circuit provided by the embodiment comprises the integrated circuit control chip with the chip internal voltage generation circuit of the external power supply, and realizes the output of any voltage value in a preset range, so that the switching power supply circuit can be used in different scenes, and the application range of the switching power supply circuit is enlarged.
Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and alterations to these embodiments without departing from the spirit of the invention and the scope of protection as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while remaining within the scope of the present invention.
Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. From the present disclosure, it will be readily understood by those of ordinary skill in the art that processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (11)
1. An internal voltage generation circuit of a chip for an external power supply, comprising: a current generation circuit, an external power supply detection circuit, and an output circuit;
the first end of the current generation circuit is connected with an internal power supply of the chip, the second end of the current generation circuit is grounded, the third end of the current generation circuit is connected with the first end of the external power supply detection circuit, the fourth end of the current generation circuit is connected with the first end of the output circuit, and the current generation circuit is used for conducting work according to the voltage provided by the internal power supply of the chip after the chip is electrified;
the second end of the external power supply detection circuit is connected with an internal power supply of the chip, the third end of the external power supply detection circuit is connected with a reference voltage, the fourth end of the external power supply detection circuit is connected with the second end of the output circuit, the fifth end of the external power supply detection circuit is connected with the third end of the output circuit and an external power supply, the sixth end of the external power supply detection circuit is grounded, the external power supply detection circuit is used for detecting that the external power supply is connected after the chip is electrified, and when the connected external power supply is larger than a preset multiple of the reference voltage, a low-level signal is generated according to the voltage of the external power supply, the reference voltage and the current generation circuit which conducts operation;
The fourth end of the output circuit is connected with an internal power supply of the chip, the fifth end of the output circuit is grounded, the sixth end of the output circuit is connected with an output end, and the output circuit is used for outputting a voltage value of the external power supply according to the low-level signal and the current generating circuit conducting work when the connected external power supply is larger than a preset multiple of a reference voltage, wherein the voltage value of the external power supply is any value in a preset range;
the external power supply detection circuit comprises a first resistor and a second resistor, the output circuit comprises a twenty-first switching tube and a zener diode, any value in the preset range is any value between a preset multiple of a reference voltage and a first voltage, and the first voltage is a smaller value of the sum of the working voltage of the internal power supply of the chip and the forward conducting voltage of the body diode of the twenty-first switching tube and the reverse breakdown voltage of the zener diode; the preset multiple is determined by the ratio of the sum of the resistance values of the first resistor and the second resistor to the resistance value of the second resistor.
2. The internal voltage generation circuit of the external power supply chip of claim 1, wherein the external power supply detection circuit is further configured to generate a high-level signal according to the reference voltage and the current generation circuit that conducts operation when the external power supply is not connected or the connected external power supply is smaller than a preset multiple of the reference voltage after the chip is powered on; the output circuit is also used for outputting non-working voltage according to the high-level signal and the current generating circuit which conducts working when the external power supply is not connected or connected is smaller than the preset multiple of the reference voltage.
3. The external power supply chip internal voltage generation circuit according to claim 1, wherein the current generation circuit includes a current source, a first switching tube, a second switching tube, and a nineteenth switching tube;
one end of the current source is connected with an internal power supply of the chip, the other end of the current source is connected with the first end of the first switching tube, the second end of the first switching tube, the first end of the second switching tube and the first end of the nineteenth switching tube, the third end of the first switching tube is connected with the second end of the second switching tube, the second end of the nineteenth switching tube is grounded, the third end of the second switching tube is connected with the first end of the external power supply detection circuit, and the third end of the nineteenth switching tube is connected with the first end of the output circuit.
4. The external power supply chip internal voltage generation circuit according to claim 2, wherein the external power supply detection circuit comprises a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube, and a first inverter;
the first end of the fifth switching tube is connected with the first end of the ninth switching tube and the third end of the current generating circuit, the second end of the fifth switching tube is connected with a reference voltage, the third end of the fifth switching tube is connected with the first end of the fourth switching tube, the second end of the fourth switching tube and the first end of the third switching tube, the second end of the third switching tube is connected with the third end of the fourth switching tube, the first end of the sixth switching tube, the first end of the seventh switching tube and a power supply inside a chip, the third end of the third switching tube is connected with the first end of the tenth switching tube, the second end of the tenth switching tube and the first end of the eleventh switching tube, the third end of the tenth switching tube is connected with the second end of the eleventh switching tube, one end of the second resistor and the first end of the third resistor and the third end of the fourth switching tube, the second end of the third resistor is connected with the third end of the third resistor and the third end of the seventh switching tube, the third end of the third resistor is connected with the third end of the seventh switching tube, the third end of the third resistor and the third end of the seventh switching tube is connected with the third end of the third resistor and the third end of the seventh switching tube.
5. The external power supply chip internal voltage generation circuit according to claim 4, wherein the output circuit includes a second inverter, a third inverter, a fourth inverter, a first capacitor, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube, and a twentieth switching tube;
one end of the second inverter is connected with the fourth end of the external power supply detection circuit, the other end of the second inverter is connected with one end of the third inverter and the first end of the seventeenth switching tube, the other end of the third inverter is connected with the first end of the sixteenth switching tube, the second end of the sixteenth switching tube is connected with the second end of the seventeenth switching tube and grounded, the third end of the sixteenth switching tube is connected with one end of the fourth inverter, the first end of the fourteenth switching tube and the first end of the fifteenth switching tube, the third end of the seventeenth switching tube is connected with the second end of the fourteenth switching tube and the third end of the fifteenth switching tube, the third end of the fourteenth switching tube is connected with the third end of the sixteenth switching tube, the first end of the eighteenth switching tube, the cathode of the first capacitor, the first end of the twenty first switching tube and the output end of the twenty-first switching tube, the third end of the sixteenth switching tube is connected with the twenty-third end of the twenty-eighth switching tube, the third end of the twenty-eighth switching tube is connected with the twenty-third end of the twenty-third switching tube, the twenty-third end of the twenty-third switching tube and the twenty-third switching tube, the twenty-third end of the twenty-third switching tube is connected with the twenty-third end of the twenty-third switching tube, and the twenty-third end of the twenty-first power supply.
6. The external power supply chip internal voltage generation circuit according to claim 4, wherein the chip internal voltage generation circuit further comprises: a first hysteresis circuit and a second hysteresis circuit;
the first end of the first hysteresis circuit is connected with an internal power supply of the chip, the second end of the first hysteresis circuit is connected with the second end of the seventh switching tube, the third end of the first hysteresis circuit is connected with the third end of the seventh switching tube, and the fourth end of the first hysteresis circuit is connected with the first end of the second hysteresis circuit and the other end of the first inverter;
the second end of the second hysteresis circuit is grounded, and the third end of the second hysteresis circuit is connected with one end of the second resistor;
the first hysteresis circuit and the second hysteresis circuit are used for switching the state repeatedly when the external power supply connected after the chip is electrified is larger than the preset multiple of the reference voltage, and if the external power supply fluctuates near the preset multiple of the reference voltage, the voltage output by the output end cannot be switched repeatedly.
7. The external power supply chip internal voltage generation circuit according to claim 6, wherein the first hysteresis circuit includes an eighth switching tube and a twelfth switching tube, and the second hysteresis circuit includes a third resistor and a thirteenth switching tube;
The first end of the eighth switching tube is connected with an internal power supply of the chip, the second end of the eighth switching tube is connected with the second end of the seventh switching tube, the third end of the eighth switching tube is connected with the first end of the twelfth switching tube, the second end of the twelfth switching tube is connected with the third end of the seventh switching tube, and the third end of the twelfth switching tube is connected with the other end of the first inverter and the first end of the thirteenth switching tube;
one end of the third resistor is connected with one end of the second resistor and the second end of the thirteenth switching tube, and the other end of the third resistor is connected with the third end of the thirteenth switching tube and grounded.
8. The external power supply chip internal voltage generation circuit according to claim 5, wherein:
the non-working voltage is the smaller value of the working voltage of the power supply inside the chip and the reverse breakdown voltage of the zener diode;
when the connected external power supply is smaller than the preset multiple of the reference voltage, the preset multiple of the reference voltage is smaller than a second voltage, and the second voltage is a smaller value of the sum of the working voltage of the internal power supply of the chip and the forward conduction voltage of the body diode of the eighteenth switching tube and the sum of the reverse breakdown voltage of the zener diode and the forward conduction voltage of the body diode of the eighteenth switching tube.
9. An integrated circuit control chip, comprising: an external power supply chip internal voltage generation circuit as claimed in any one of claims 1 to 8.
10. A switching power supply circuit, comprising: the integrated circuit control chip of claim 9.
11. The switching power supply circuit of claim 10 wherein the switching power supply circuit is configured to charge a battery.
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| US6249169B1 (en) * | 1998-06-01 | 2001-06-19 | Fujitsu Limited | Transistor output circuit |
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