CN115224940B - Constant-current constant-voltage output circuit and power chip - Google Patents
Constant-current constant-voltage output circuit and power chip Download PDFInfo
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- CN115224940B CN115224940B CN202210870959.5A CN202210870959A CN115224940B CN 115224940 B CN115224940 B CN 115224940B CN 202210870959 A CN202210870959 A CN 202210870959A CN 115224940 B CN115224940 B CN 115224940B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- 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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- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
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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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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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
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0019—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being load current fluctuations
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
A constant-current constant-voltage output circuit and a power chip belong to the technical field of power circuits, and current sampling signals are acquired through a current detection circuit; the voltage detection circuit collects voltage sampling signals; the constant voltage operation circuit is used for operating the voltage sampling signal and the first reference voltage to output a first amplified signal; the constant current operation circuit is used for operating the current sampling signal and the second reference voltage to output a second amplified signal, comparing the current sampling signal with the second reference voltage and outputting a control signal according to a comparison result; a first switching circuit outputting a second amplified signal according to the disconnection of the control signal; the second switch circuit outputs a first amplified signal according to the control signal; the loop compensation circuit outputs a compensation signal according to the first amplification signal or the second amplification signal, and the power circuit outputs direct current according to the compensation signal; the hardware circuit is simplified, and the stability of switching constant voltage and constant current stages is improved.
Description
Technical Field
The invention belongs to the technical field of switch-mode power supply circuits, and particularly relates to a constant-current constant-voltage output circuit and a power supply chip.
Background
At present, the traditional constant-current constant-voltage output circuit adopts two groups of independent error amplifiers to output two paths of error amplified signals to respectively carry out constant-voltage regulation and constant-current regulation, so that two groups of compensation circuits are needed to form two paths of independent signal processing circuits, which leads to complex circuits and higher hardware cost; and because the two groups of error amplification control circuits are independent of each other, the switching between the constant voltage stage and the constant current stage is not timely, so that the stability of the output voltage is poor.
Disclosure of Invention
The embodiment of the invention provides a constant-current constant-voltage output circuit and a power chip, aiming at solving the problems of complex circuit and poor stability of the traditional constant-current constant-voltage output circuit.
A first aspect of an embodiment of the present invention provides a constant current constant voltage output circuit including: a current detection circuit configured to sample a current of the direct current to output a current sampling signal; a voltage detection circuit connected with the current detection circuit and configured to sample the voltage of the direct current so as to output a voltage sampling signal; a constant voltage operation circuit connected with the voltage detection circuit and configured to operate the voltage sampling signal and the first reference voltage so as to output a first amplified signal; the constant current operation circuit is connected with the current detection circuit and is configured to operate the current sampling signal and the second reference voltage to output a second amplified signal, compare the current sampling signal with the second reference voltage and output a control signal according to a comparison result; a first switching circuit connected to the constant current operation circuit and configured to be turned off according to the control signal to stop outputting the second amplified signal, and turned on according to the stop of the control signal to output the second amplified signal; a second switching circuit connected to the constant current operation circuit and the constant voltage operation circuit, configured to be turned on according to the control signal to output the first amplified signal, and turned off according to a stop of the control signal to stop outputting the first amplified signal; a loop compensation circuit connected to the first switch circuit and the second switch circuit and configured to output a compensation signal according to the first amplified signal or the second amplified signal; and the power circuit is connected with the loop compensation circuit, the current detection circuit and the constant voltage operation circuit and is configured to output direct current according to the compensation signal.
In one embodiment, the constant current operation circuit is specifically configured to operate the current sampling signal and the second reference voltage to output the second amplified signal, and output the control signal when the current sampling signal is smaller than the second reference voltage, and stop outputting the control signal when a difference between the current sampling signal and the second reference voltage is larger than a preset value.
In one embodiment, the constant-current constant-voltage output circuit further comprises a first unidirectional conduction circuit and a third switch circuit; the constant current operation circuit is further configured to stop outputting the control signal and operate the current sampling signal and the second reference voltage to output the second amplified signal when the current sampling signal is greater than the second reference voltage and the current sampling signal is less than the sum of the second reference voltage and the preset value; a first unidirectional conduction circuit connected in parallel with the second switch circuit and configured to unidirectional conduct the second amplified signal; the third switch circuit is connected with the first unidirectional conduction circuit, the second switch circuit and the constant current operation circuit, is configured to be connected with the second amplified signal and outputs the second amplified signal according to the stop of the control signal; the constant current operation circuit is further configured to absorb the second amplified signal.
In one embodiment, the constant current operation circuit includes a first inverter, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, an eighth field effect transistor, a ninth field effect transistor, a tenth field effect transistor, an eleventh field effect transistor, a twelfth field effect transistor, a thirteenth field effect transistor, a fourteenth field effect transistor, a fifteenth field effect transistor, a sixteenth field effect transistor, and a seventeenth field effect transistor; the first power supply is connected with the drain electrode of the first field effect transistor and the drain electrode of the second field effect transistor; the grid electrode of the first field effect transistor is used as a current sampling signal input end of the constant current operation circuit and is connected with the current detection circuit so as to be connected with a current sampling signal; the source electrode of the first field effect tube is connected with the drain electrode of the fifth field effect tube, the grid electrode of the fifth field effect tube and the grid electrode of the seventh field effect tube; the grid electrode of the second field effect transistor is used as a second reference voltage input end of the constant current operation circuit so as to be connected with a second reference voltage; the source electrode of the second field effect tube is connected with the drain electrode of the sixth field effect tube, the grid electrode of the eighth field effect tube, the grid electrode of the tenth field effect tube, the grid electrode of the fourteenth field effect tube and the grid electrode of the fifteenth field effect tube; the grid electrode of the third field effect tube is connected with the grid electrode of the fourth field effect tube, the grid electrode of the ninth field effect tube, the grid electrode of the thirteenth field effect tube, the source electrode of the third field effect tube and the drain electrode of the seventh field effect tube; the drain electrode of the third field effect tube, the drain electrode of the fourth field effect tube, the drain electrode of the ninth field effect tube and the drain electrode of the thirteenth field effect tube are connected with the first power supply; the source electrode of the fourth field effect transistor and the drain electrode of the eighth field effect transistor are used as a second amplified signal output end of the constant current operation circuit together and are connected with the first switch circuit so as to output a second amplified signal; the source electrode of the fifth field effect tube, the source electrode of the seventh field effect tube, the source electrode of the sixth field effect tube, the source electrode of the eighth field effect tube, the source electrode of the tenth field effect tube, the source electrode of the eleventh field effect tube, the source electrode of the twelfth field effect tube, the source electrode of the fourteenth field effect tube and the source electrode of the fifteenth field effect tube are commonly connected with the power ground; the source electrode of the ninth field effect transistor is connected with the drain electrode of the tenth field effect transistor, the drain electrode of the eleventh field effect transistor, the grid electrode of the eleventh field effect transistor and the grid electrode of the twelfth field effect transistor; the drain electrode of the twelfth field effect transistor is connected with the source electrode of the seventeenth field effect transistor; the source electrode of the thirteenth field effect transistor is connected with the drain electrode of the fourteenth field effect transistor, the drain electrode of the sixteenth field effect transistor and the input end of the first inverter; the grid electrode of the sixteenth field effect transistor, the grid electrode of the seventeenth field effect transistor and the output end of the first inverter are used as control signal output ends of the constant current operation circuit and are connected with the first switch circuit and the second switch circuit so as to output control signals; the source electrode of the sixteenth field effect transistor is connected with the drain electrode of the fifteenth field effect transistor; the drain electrode of the seventeenth field effect transistor is used as a second amplified signal input end of the constant current operation circuit and is connected with the first unidirectional conduction circuit, the constant voltage operation circuit and the second switch circuit so as to absorb the second amplified signal.
In one embodiment, a power circuit includes: a PWM signal generator connected with the loop compensation circuit, the first switch circuit and the second switch circuit and configured to output PWM signals according to the compensation signals; and the power circuit is connected with the PWM signal generator, the current detection circuit and the constant voltage operation circuit and is configured to output direct current according to the PWM signal.
In one embodiment, the power circuit comprises an eighteenth field effect transistor, a nineteenth field effect transistor, an inductor, a first capacitor and a second power supply; the grid electrode of the eighteenth field effect transistor and the grid electrode of the nineteenth field effect transistor are used as PWM signal input ends of the power circuit together and are connected with the PWM signal generator so as to be connected with PWM signals; the drain electrode of the eighteenth field effect transistor is connected with a second power supply; a source electrode of the nineteenth field effect transistor is connected with power ground; the first end of the inductor is connected with the source electrode of the eighteenth field effect transistor and the drain electrode of the nineteenth field effect transistor; the second end of the inductor and the first end of the first capacitor are used as direct current output ends of the power circuit together and are connected with the current detection current and the voltage detection current so as to output direct current; the second end of the first capacitor is connected with the power ground.
In one embodiment, the constant voltage operation circuit includes a first operational amplifier; the reverse input end of the first operational amplifier is used as a voltage sampling signal input end of the constant voltage operational circuit and is connected with the voltage detection circuit so as to be connected with a voltage sampling signal; the positive input end of the first operational amplifier is used as the input end of the first reference voltage of the constant voltage operational circuit so as to be connected with the first reference voltage.
In one embodiment, the loop compensation circuit includes a first resistor and a second capacitor; the first end of the first resistor is used as a compensation signal output end of the loop compensation circuit, a first amplified signal input end of the loop compensation circuit and a second amplified signal input end of the loop compensation circuit, and is connected with the first switch circuit, the second switch circuit and the power supply circuit to be connected with the first amplified signal or the second amplified signal and output a compensation signal; the second end of the first resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the power ground.
In one embodiment, the second switching circuit includes a second inverter and a second switch; the input end of the second inverter is used as the input end of the control signal of the second switching circuit, and is connected with the first switching circuit, the third switching circuit and the constant current operation circuit to be connected with the control signal; the output end of the second inverter is connected with the control end of the second switch, and the first input and output end of the second switch is used as a first amplified signal input end of the second switch circuit and is connected with the constant voltage operation circuit so as to be connected with a first amplified signal; the second input/output end of the second switch is used as a first amplified signal output end of the second switch circuit and is connected with the first switch circuit, the loop compensation circuit and the power circuit to output a first amplified signal.
In one embodiment, the first switching circuit comprises a first switch; the third switch circuit comprises a third switch; the first input and output end of the first switch is used as a second amplified signal input end of the first switch circuit and is connected with the constant current operation circuit so as to be connected with a second amplified signal; the second input and output end of the first switch is used as a second amplified signal output end of the first switch circuit and is connected with the second switch circuit, the loop compensation circuit and the power circuit so as to output a second amplified signal; the first input and output end of the third switch is used as a second amplified signal input end of the third switch circuit and is connected with the first single-phase conducting circuit, the second switch circuit and the constant voltage operation circuit so as to be connected with a second amplified signal; the second input/output end of the third switch is used as a second amplified signal output end of the third switch circuit and is connected with the constant current operation circuit so as to output a second amplified signal.
A second aspect of the embodiment of the present invention provides a power chip, where the power chip includes the constant current and constant voltage output circuit described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the constant voltage operational amplifier outputs a first amplified signal through operation on a voltage sampling signal, the constant current operational amplifier outputs a second amplified signal through operation on a current sampling signal, the current sampling signal is compared with a reference voltage to output a control signal, meanwhile, the switching circuit switches and outputs the first amplified signal or the second amplified signal according to one control signal, and then a loop compensation circuit is shared, so that voltage conversion with constant current and constant voltage output characteristics is realized, timeliness of switching between a constant voltage stage and a constant current stage is improved, loss of constant voltage and constant current switching is reduced, and stability of output voltage is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a constant current and constant voltage output circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another constant-current constant-voltage output circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a part of an exemplary circuit structure of a constant current and constant voltage output circuit according to an embodiment of the present invention;
fig. 4 shows an example circuit configuration of a constant current operation circuit in the constant current constant voltage output circuit provided by the embodiment of the invention;
fig. 5 is a schematic diagram showing a schematic circuit configuration of a part of an example of a constant-current constant-voltage output circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a loop compensation process of a constant current operation and discharge circuit in a constant current and constant voltage output circuit according to an embodiment of the present invention;
FIG. 7 is an ideal C-V diagram of a constant current loop and a constant voltage loop in a constant current and constant voltage output circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, fig. 1 is a schematic diagram of a constant current and constant voltage output circuit according to an embodiment of the present invention, and a first aspect of the embodiment of the present invention provides a constant current and constant voltage output circuit, which includes a current detection circuit 11, a constant voltage operation circuit 41, a constant current operation circuit 31, a first switch circuit 51, a second switch circuit 61, a loop compensation circuit 71, and a power supply circuit 81.
A current detection circuit 11 configured to sample a current of the direct current to output a current sampling signal; the voltage detection circuit 21 is connected to the current detection circuit 11 and configured to sample the voltage of the direct current to output a voltage sampling signal.
The constant voltage operation circuit 41 is connected to the voltage detection circuit 21 and configured to operate the voltage sampling signal and the first reference voltage to output a first amplified signal.
The constant current operation circuit 31 is connected to the current detection circuit 11, and is configured to operate the current sampling signal and the second reference voltage to output a second amplified signal, compare the current sampling signal with the second reference voltage, and output a control signal according to the comparison result.
The first switch circuit 51 is connected to the constant current operation circuit 31, and is configured to be turned off according to the control signal to stop outputting the second amplified signal, and turned on according to the stop of the control signal to output the second amplified signal.
The second switch circuit 61, connected to the constant current operation circuit 31 and the constant voltage operation circuit 41, is configured to be turned on according to a control signal to output the first amplified signal, and turned off according to a stop of the control signal to stop outputting the first amplified signal.
The loop compensation circuit 71 is connected to the first switch circuit 51 and the second switch circuit 61, and is configured to output a compensation signal according to the first amplified signal or the second amplified signal.
The power supply circuit 81 is connected to the loop compensation circuit 71, the current detection circuit 11, and the constant voltage operation circuit 41, and is configured to output a direct current based on the compensation signal.
In one embodiment, the constant current operation circuit 31 in the constant current and constant voltage output circuit is specifically configured to operate the current sampling signal and the second reference voltage to output the second amplified signal, and output the control signal when the current sampling signal is smaller than the second reference voltage, and stop outputting the control signal when the difference between the current sampling signal and the second reference voltage is larger than the preset value.
Therefore, the constant-current and constant-voltage output circuit realizes the switching between the constant-voltage stage and the constant-current stage according to one control signal, avoids the untimely switching and improves the stability of the output voltage.
As shown in fig. 2, the constant-current constant-voltage output circuit further includes a first unidirectional conductive circuit 101 and a third switch circuit 91.
The constant current operation circuit 31 is further configured to stop outputting the control signal and operate the current sampling signal and the second reference voltage to output the second amplified signal when the current sampling signal is greater than the second reference voltage and the current sampling signal is less than the sum of the second reference voltage and the preset value; a first unidirectional conduction circuit 101 connected in parallel with the second switch circuit 61 and configured to unidirectional conduct the second amplified signal; a third switch circuit 91 connected to the first unidirectional conduction circuit 101, the second switch circuit 61, and the constant current operation circuit 31, configured to switch in the second amplified signal, and output the second amplified signal according to the stop of the control signal; the constant current operation circuit 31 is also configured to absorb the second amplified signal.
By means of the first unidirectional conducting circuit 101 and the third switch circuit 91, the second amplified signal output by the constant current operation circuit 31 sequentially flows through the first switch circuit, the first unidirectional conducting circuit 101 and the third switch circuit 91 at the switching moment of the constant voltage stage and the constant current stage, and is absorbed by the constant voltage operation circuit 31, which is equivalent to the fact that the constant voltage operation circuit 31 does not work, the regulating loop is in a constant voltage mode, and the regulating loop disorder caused by the second amplified signal output by the constant current operation circuit 31 is avoided when the actual output current of the constant current and constant voltage output circuit is smaller than the current set value and the control signal is not output at the same time, namely, the regulating loop is in a hysteresis range.
In one embodiment, as shown in fig. 3, the power supply circuit 81 includes a PWM signal generator 82 and a power circuit 83; a PWM signal generator 82 connected to the loop compensation circuit 71, the first switching circuit 51, and the second switching circuit 61, and configured to output a PWM signal according to the compensation signal; the power circuit 83 is connected to the PWM signal generator 82, the current detection circuit 11, and the constant voltage operation circuit 41, and is configured to output a direct current based on the PWM signal.
Fig. 4 shows a partial example circuit structure of the constant current and constant voltage output circuit provided by the embodiment of the present invention, fig. 5 shows a schematic circuit principle structure of the constant current operation circuit in the constant current and constant voltage output circuit provided by the embodiment of the present invention, and for convenience of explanation, only the portion relevant to the embodiment of the present invention is shown, which is described in detail below:
as shown in fig. 5, the constant current operation circuit 31 includes a first inverter N1, a first field effect transistor M1, a second field effect transistor M2, a third field effect transistor M3, a fourth field effect transistor M4, a fifth field effect transistor M5, a sixth field effect transistor M6, a seventh field effect transistor M7, an eighth field effect transistor M8, a ninth field effect transistor M9, a tenth field effect transistor M10, an eleventh field effect transistor M11, a twelfth field effect transistor M12, a thirteenth field effect transistor M13, a fourteenth field effect transistor M14, a fifteenth field effect transistor M15, a sixteenth field effect transistor M16, and a seventeenth field effect transistor M17; the first power supply is connected with the drain electrode of the first field effect transistor M1 and the drain electrode of the second field effect transistor M2; the grid electrode of the first field effect transistor M1 is used as a current sampling signal input end of the constant current operation circuit 31 and is connected with the current detection circuit 11 so as to be connected with a current sampling signal; the source electrode of the first field effect transistor M1 is connected with the drain electrode of the fifth field effect transistor M5, the grid electrode of the fifth field effect transistor M5 and the grid electrode of the seventh field effect transistor M7; the grid electrode of the second field effect transistor M2 is used as a second reference voltage input end of the constant current operation circuit 31 so as to be connected with a second reference voltage; the source electrode of the second field effect transistor M2 is connected with the drain electrode of the sixth field effect transistor M6, the grid electrode of the eighth field effect transistor M8, the grid electrode of the tenth field effect transistor M10, the grid electrode of the fourteenth field effect transistor M14 and the grid electrode of the fifteenth field effect transistor M15; the grid electrode of the third field effect transistor M3 is connected with the grid electrode of the fourth field effect transistor M4, the grid electrode of the ninth field effect transistor M9, the grid electrode of the thirteenth field effect transistor M13, the source electrode of the third field effect transistor M3 and the drain electrode of the seventh field effect transistor M7; the drain electrode of the third field effect transistor M3, the drain electrode of the fourth field effect transistor M4, the drain electrode of the ninth field effect transistor M9 and the drain electrode of the thirteenth field effect transistor M13 are connected to the first power supply; the source electrode of the fourth field effect transistor M4 and the drain electrode of the eighth field effect transistor M8 are used together as a second amplified signal output end of the constant current operation circuit 31, and are connected with the first switch circuit 51 so as to output a second amplified signal; the source of the fifth field effect transistor M5, the source of the seventh field effect transistor M7, the source of the sixth field effect transistor M6, the source of the eighth field effect transistor M8, the source of the tenth field effect transistor M10, the source of the eleventh field effect transistor M11, the source of the twelfth field effect transistor M12, the source of the fourteenth field effect transistor M14 and the source of the fifteenth field effect transistor M15 are commonly connected to the power ground; the source electrode of the ninth field effect transistor M9 is connected with the drain electrode of the tenth field effect transistor M10, the drain electrode of the eleventh field effect transistor M11, the grid electrode of the eleventh field effect transistor M11 and the grid electrode of the twelfth field effect transistor M12; the drain electrode of the twelfth field effect transistor M12 is connected with the source electrode of the seventeenth field effect transistor M17; the source electrode of the thirteenth field effect transistor M13 is connected with the drain electrode of the fourteenth field effect transistor M14, the drain electrode of the sixteenth field effect transistor M16 and the input end of the first inverter; the gate of the sixteenth field effect transistor M16, the gate of the seventeenth field effect transistor M17, and the output terminal of the first inverter are used together as the control signal output terminal of the constant current operation circuit 31, and are connected to the first switch circuit 51 and the second switch circuit 61 to output control signals; the source electrode of the sixteenth field effect transistor M16 is connected with the drain electrode of the fifteenth field effect transistor M15; the drain of the seventeenth field-effect transistor M17 is connected as a second amplified signal input terminal of the constant current operation circuit 31 to the first unidirectional current-carrying circuit 101, the constant voltage operation circuit 41, and the second switching circuit 61 to absorb the second amplified signal.
As shown in fig. 4, the power circuit 83 includes an eighteenth fet M18, a nineteenth fet M19, an inductor L, a first capacitor C1, and a second power source Vin; the grid electrode of the eighteenth field effect transistor M18 and the grid electrode of the nineteenth field effect transistor M19 are used as PWM signal input ends of the power circuit 83 together and are connected with the PWM signal generator 82 so as to be connected with PWM signals; the drain electrode of the eighteenth field effect transistor M18 is connected with a second power supply; a source electrode of the nineteenth field effect transistor M19 is connected with power ground; the first end of the inductor is connected with the source electrode of the eighteenth field effect transistor M18 and the drain electrode of the nineteenth field effect transistor M19; the second end of the inductor L and the first end of the first capacitor C1 are used as a direct current output end of the power circuit 83, and are connected with the current detection circuit 11 and the voltage detection circuit 21 to output direct current; the second end of the first capacitor C1 is connected with the power ground.
As shown in fig. 4, the constant voltage operation circuit 41 includes a first operational amplifier GM-CV; the inverting input terminal of the first operational amplifier GM-CV is used as the voltage sampling signal input terminal of the constant voltage operation circuit 41, and is connected to the voltage detection circuit 21 to be connected to the voltage sampling signal; the positive input terminal of the first operational amplifier GM-CV is used as the input terminal of the first reference voltage of the constant voltage operation circuit 41 to be connected to the first reference voltage.
As shown in fig. 4, the loop compensation circuit 71 includes a first resistor R1 and a second capacitor C2; the first end of the first resistor R1 is used as a compensation signal output end of the loop compensation circuit 71, a first amplified signal input end of the loop compensation circuit 71 and a second amplified signal input end of the loop compensation circuit 71, and is connected with the first switch circuit 51, the second switch circuit 61 and the power circuit 81 to be connected with the first amplified signal or the second amplified signal and output a compensation signal; the second end of the first resistor R1 is connected with the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the power ground.
As shown in fig. 4, the second switching circuit 61 includes a second inverter N2 and a second switch S2; the input terminal of the second inverter N2 is connected to the first switch circuit 51, the third switch circuit 91, and the constant current operation circuit 31 as the input terminal of the control signal of the second switch circuit 61 to be connected to the control signal; the output end of the second inverter N2 is connected to the control end of the second switch S2, and the first input/output end of the second switch S2 is used as the first amplified signal input end of the second switch circuit 61, and is connected to the constant voltage operation circuit 41 to access the first amplified signal; the second input/output terminal of the second switch S2 is connected to the first switch circuit 51, the loop compensation circuit 71, and the power supply circuit 81 as a first amplified signal output terminal of the second switch circuit 61 to output a first amplified signal.
As shown in fig. 4, the first switch S1 circuit 51 includes a first switch S1; the third switch S3 circuit 91 includes a third switch S3; the first input/output end of the first switch S1 is used as a second amplified signal input end of the first switch S1 circuit 51, and is connected with the constant current operation circuit 31 to be connected with a second amplified signal; the second input/output terminal of the first switch S1 is connected to the second switch S2 circuit 61, the loop compensation circuit 71, and the power supply circuit 81 as the second amplified signal output terminal of the first switch S1 circuit 51 to output a second amplified signal; the first input/output end of the third switch S3 is used as the second amplified signal input end of the third switch S3 circuit 91, and is connected with the first single turn-on circuit 101, the second switch S2 circuit 61 and the constant voltage operation circuit 41 to be connected with the second amplified signal; the second input/output terminal of the third switch S3 is connected to the constant current operation circuit 31 as the second amplified signal output terminal of the third switch S3 circuit 91 to output the second amplified signal.
As shown in fig. 4, the first unidirectional conductive circuit 101 includes a first diode D1.
The following further illustrates the operation of fig. 4 and 5 in conjunction with the principles of operation:
adjusting the magnitude of the load of the constant current constant voltage output circuit changes the magnitude of the current, thereby causing a circuit change.
When the load resistance is small, the difference value of the current sampling signal minus the second reference voltage is larger than a preset value, the constant current operation circuit 31 stops outputting the control signal, the first switch S1 and the third switch S3 are closed, and the second switch S2 is opened; in specific implementation, the current detection circuit 11 samples the dc current to output a current sampling signal ifb to the constant current operation circuit 31, the constant current operation circuit 31 operates the current sampling signal ifb at the negative input end and the second reference voltage Vief to output a second amplified signal to the first input/output end of the first switch S1, and the first input/output end of the first switch S1 outputs the second amplified signal to the loop compensation circuit 71 due to the closing of the first switch S1; since the second switch S2 is turned off, the second switch S2 stops outputting the first amplified signal, and at this time, the regulation loop is in the constant current mode.
When the current sampling signal ifb is greater than the second reference voltage and the current sampling signal ifb is less than the sum of the second reference voltage and the preset value, the constant-current operation circuit 31 outputs the second amplified signal, but due to hysteresis, the constant-current operation circuit 31 still stops outputting the control signal, the first switch S1 and the third switch S3 are closed, the second switch S2 is opened, the second amplified signal output by the constant-current operation circuit 31 sequentially flows through the first switch S1, the first diode D1, the third switch S3 and the second amplified signal input end of the constant-current operation circuit 31, and is absorbed by the constant-current operation circuit 31, which is equivalent to the constant-voltage operation circuit 31 not being active, and the regulation loop is in the constant-voltage mode, at this time the constant-current operation circuit 31 is in the hysteresis state.
When the load resistance is larger, the constant current operation circuit 31 outputs a control signal when the current sampling signal is smaller than the second reference voltage Vief, the first switch S1 and the third switch S3 are opened, the second switch S2 is closed, the voltage detection circuit 21 samples the voltage of the direct current to output the voltage sampling signal to the first operational amplifier GM-CV through the output terminal FB, the first operational amplifier GM-CV operates the voltage sampling signal FB and the first reference voltage Vref through the negative input terminal to output the first amplified signal to the loop compensation circuit 71 through the second switch S2, and at this time, the first switch S1 stops outputting the second amplified signal due to the opening of the first switch S1, and the constant current constant voltage output circuit is in the constant voltage mode.
The constant current operational amplifier of fig. 3 is further described in conjunction with the circuit principle portion of fig. 2 as follows:
the first power supply, the first field effect transistor M1, the second field effect transistor M2, the third field effect transistor M3, the fourth field effect transistor M4, the fifth field effect transistor M5, the sixth field effect transistor M6, the seventh field effect transistor M7, and the eighth field effect transistor M8 are integrated devices functioning as error amplifiers in the constant current operation circuit 31, the gate of the first field effect transistor M1 receives the current sampling signal ifb input by the current detection circuit 11, the gate of the second field effect transistor M2 inputs the second reference voltage, and the source of the fourth field effect transistor M4 and the drain of the eighth field effect transistor M8 are used together as the second amplified signal output end of the constant current operation circuit 31.
The ninth field-effect transistor M9, the tenth field-effect transistor M10, the eleventh field-effect transistor M11, the twelfth field-effect transistor M12, and the seventeenth field-effect transistor M17 are used as the first constant current source modules of the constant current operation circuit 31; the thirteenth field effect transistor M13 and the fourteenth field effect transistor M14 are used as a second constant current source module of the constant current operation circuit 31; the second constant current source module and the second inverter N2 are used for carrying out gain and amplification on the input error signal and outputting a control signal, and meanwhile, the second amplification signal is absorbed according to a feedback signal of the control signal to form a constant current loop.
The fifteenth field effect transistor M15 and the sixteenth field effect transistor M16 are hysteresis state modules of the circuit, and the hysteresis state modules work in a hysteresis state mode by combining the first constant current source module, the second constant current source module and the second inverter N2 according to the constant current constant voltage output circuit shown in fig. 5.
It should be noted that, in the above steps, according to the circuit load changes detected by the current detection circuit 11 and the voltage detection circuit 21, the corresponding first switch S1, second switch S2, and third switch S3 are controlled by the control signals, so as to control the constant current and constant voltage output circuit to enter different amplified signal output stages.
Fig. 6 is a loop compensation flow chart of a constant current operation and discharge circuit 31 in a constant current and constant voltage output circuit according to an embodiment of the present invention; when the load resistance is large, the current detected by the current detection circuit 11 is smaller than a preset value, and at the moment, the constant current operation circuit 31 does not work, namely, outputs a control signal (namely, the control signal CC_cont is 0), and at the moment, the first operational amplifier GM-CV works; in contrast, when the load gradually decreases and the output current increases to reach the preset current value, the output of the control signal is stopped (i.e., CC-cont is 1), as shown in fig. 3, the fifteenth field effect transistor M15 and the sixteenth field effect transistor M16 in the constant current operation circuit 31 operate, and the first operational amplifier GM-CV is not active, and the circuit is in the Hysteresis (Hysteresis) range, i.e., the current detection circuit samples the current of the direct current to output a current sampling signal to the constant current operation circuit, as shown in fig. 5, to form a loop compensation loop of the circuit.
The power supply of the direct current in the circuit is supplied by a power supply circuit, and the power supply circuit outputs the direct current mainly according to the compensation signal; in specific implementation, the PWM signal generator 82 outputs a PWM signal according to the compensation signal, the PWM signal is connected to the power circuit 83, the gate of the eighteenth fet M18 and the gate of the nineteenth fet M19 in the power circuit 83 are used together as the PWM signal input end of the power circuit 83, the PWM signal is processed through the first fet M1, the second fet M2, the first inductor L and the first capacitor C1, the second end of the inductor L and the first end of the first capacitor C1 are used together as the dc output end of the power circuit 83, and the dc is output to the current detection circuit 11 or the voltage detection circuit 21.
Fig. 7 is an ideal C-V curve of a constant current loop and a constant voltage loop in the constant current and constant voltage output circuit according to an embodiment of the present invention, and the ideal C-V curve of the constant voltage loop and the constant current loop can be realized through the constant voltage and constant current switching at different stages.
A second aspect of the embodiment of the present invention provides a power chip, where the power chip includes the constant current and constant voltage output circuit described above.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A constant current and constant voltage output circuit, comprising:
a current detection circuit configured to sample a current of the direct current to output a current sampling signal;
a voltage detection circuit connected with the current detection circuit and configured to sample the voltage of the direct current so as to output a voltage sampling signal;
a constant voltage operation circuit connected with the voltage detection circuit and configured to operate the voltage sampling signal and the first reference voltage so as to output a first amplified signal;
the constant current operation circuit is connected with the current detection circuit and is configured to operate the current sampling signal and the second reference voltage to output a second amplified signal, compare the current sampling signal with the second reference voltage and output a control signal according to a comparison result;
a first switching circuit connected to the constant current operation circuit and configured to be turned off according to the control signal to stop outputting the second amplified signal, and turned on according to the stop of the control signal to output the second amplified signal;
a second switching circuit connected to the constant current operation circuit and the constant voltage operation circuit, configured to be turned on according to the control signal to output the first amplified signal, and turned off according to a stop of the control signal to stop outputting the first amplified signal;
a loop compensation circuit connected to the first switch circuit and the second switch circuit and configured to output a compensation signal according to the first amplified signal or the second amplified signal;
a power supply circuit connected to the loop compensation circuit, the current detection circuit, and the constant voltage operation circuit, and configured to output a direct current according to the compensation signal;
the constant-current constant-voltage output circuit further comprises a first unidirectional conduction circuit and a third switch circuit;
the constant current operation circuit is further configured to stop outputting the control signal and operate the current sampling signal and the second reference voltage to output the second amplified signal when the current sampling signal is greater than the second reference voltage and the current sampling signal is less than the sum of the second reference voltage and a preset value;
the first unidirectional conduction circuit is connected with the second switch circuit in parallel and is configured to unidirectional conduct a second amplified signal;
the third switch circuit is connected with the first unidirectional conduction circuit, the second switch circuit and the constant current operation circuit, is configured to be connected with the second amplified signal, and outputs the second amplified signal according to the stop of the control signal;
the constant current operation circuit is further configured to absorb the second amplified signal.
2. The constant-current constant-voltage output circuit according to claim 1, wherein the constant-current operation circuit is specifically configured to operate a current sampling signal with the second reference voltage to output the second amplified signal, and to output a control signal when the current sampling signal is smaller than the second reference voltage, and to stop outputting the control signal when a difference of the current sampling signal minus the second reference voltage is larger than a preset value.
3. The constant-current constant-voltage output circuit according to claim 1, wherein the constant-current operation circuit includes a first inverter, a first field-effect transistor, a second field-effect transistor, a third field-effect transistor, a fourth field-effect transistor, a fifth field-effect transistor, a sixth field-effect transistor, a seventh field-effect transistor, an eighth field-effect transistor, a ninth field-effect transistor, a tenth field-effect transistor, an eleventh field-effect transistor, a twelfth field-effect transistor, a thirteenth field-effect transistor, a fourteenth field-effect transistor, a fifteenth field-effect transistor, a sixteenth field-effect transistor, and a seventeenth field-effect transistor;
the first power supply is connected with the drain electrode of the first field effect transistor and the drain electrode of the second field effect transistor;
the grid electrode of the first field effect transistor is used as a current sampling signal input end of the constant current operation circuit and is connected with the current detection circuit so as to be connected with the current sampling signal; the source electrode of the first field effect tube is connected with the drain electrode of the fifth field effect tube, the grid electrode of the fifth field effect tube and the grid electrode of the seventh field effect tube;
the grid electrode of the second field effect transistor is used as a second reference voltage input end of the constant current operation circuit so as to be connected with the second reference voltage; the source electrode of the second field effect transistor is connected with the drain electrode of the sixth field effect transistor, the grid electrode of the eighth field effect transistor, the grid electrode of the tenth field effect transistor, the grid electrode of the fourteenth field effect transistor and the grid electrode of the fifteenth field effect transistor;
the grid electrode of the third field effect tube is connected with the grid electrode of the fourth field effect tube, the grid electrode of the ninth field effect tube, the grid electrode of the thirteenth field effect tube, the source electrode of the third field effect tube and the drain electrode of the seventh field effect tube;
the drain electrode of the third field effect tube, the drain electrode of the fourth field effect tube, the drain electrode of the ninth field effect tube and the drain electrode of the thirteenth field effect tube are connected with the first power supply in a sharing way;
the source electrode of the fourth field effect transistor and the drain electrode of the eighth field effect transistor are used as a second amplified signal output end of the constant current operation circuit together and are connected with the first switch circuit so as to output the second amplified signal; the source electrode of the fifth field effect transistor, the source electrode of the seventh field effect transistor, the source electrode of the sixth field effect transistor, the source electrode of the eighth field effect transistor, the source electrode of the tenth field effect transistor, the source electrode of the eleventh field effect transistor, the source electrode of the twelfth field effect transistor, the source electrode of the fourteenth field effect transistor and the source electrode of the fifteenth field effect transistor are commonly connected to a power supply ground;
the source electrode of the ninth field effect transistor is connected with the drain electrode of the tenth field effect transistor, the drain electrode of the eleventh field effect transistor, the grid electrode of the eleventh field effect transistor and the grid electrode of the twelfth field effect transistor;
the drain electrode of the twelfth field effect transistor is connected with the source electrode of the seventeenth field effect transistor;
the source electrode of the thirteenth field effect transistor is connected with the drain electrode of the fourteenth field effect transistor, the drain electrode of the sixteenth field effect transistor and the input end of the first inverter;
the grid electrode of the sixteenth field effect transistor, the grid electrode of the seventeenth field effect transistor and the output end of the first inverter are used as control signal output ends of the constant current operation circuit and are connected with the first switch circuit and the second switch circuit so as to output the control signals;
the source electrode of the sixteenth field effect transistor is connected with the drain electrode of the fifteenth field effect transistor;
the drain electrode of the seventeenth field effect transistor is used as a second amplified signal input end of the constant current operation circuit and is connected with the first unidirectional conduction circuit, the constant voltage operation circuit and the second switch circuit so as to absorb the second amplified signal.
4. The constant-current constant-voltage output circuit according to claim 1, wherein the power supply circuit includes:
a PWM signal generator connected to the loop compensation circuit, the first switching circuit, and the second switching circuit, configured to output a PWM signal according to a compensation signal;
and a power circuit connected with the PWM signal generator, the current detection circuit and the constant voltage operation circuit and configured to output direct current according to PWM signals.
5. The constant-current constant-voltage output circuit according to claim 4, wherein the power circuit includes an eighteenth field effect transistor, a nineteenth field effect transistor, an inductor, a first capacitor, a second power supply;
the grid electrode of the eighteenth field effect transistor and the grid electrode of the nineteenth field effect transistor are used as PWM signal input ends of the power circuit together and are connected with the PWM signal generator so as to be connected with PWM signals; the drain electrode of the eighteenth field effect transistor is connected with the second power supply;
the source electrode of the nineteenth field effect transistor is connected with the power supply ground;
the first end of the inductor is connected with the source electrode of the eighteenth field effect transistor and the drain electrode of the nineteenth field effect transistor; the second end of the inductor and the first end of the first capacitor are used as direct current output ends of the power circuit together and are connected with the current detection circuit and the voltage detection circuit so as to output the direct current;
the second end of the first capacitor is connected with power ground.
6. The constant-current constant-voltage output circuit according to any one of claims 1 to 5, the constant-voltage operation circuit including a first operational amplifier;
the reverse input end of the first operational amplifier is used as a voltage sampling signal input end of the constant voltage operation circuit and is connected with the voltage detection circuit so as to be connected with the voltage sampling signal;
the positive input end of the first operational amplifier is used as the input end of the first reference voltage of the constant voltage operational circuit so as to be connected with the first reference voltage.
7. The constant-current constant-voltage output circuit according to any one of claims 1 to 5, wherein the loop compensation circuit includes a first resistor and a second capacitor;
the first resistor first end is used as a compensation signal output end of the loop compensation circuit, a first amplified signal input end of the loop compensation circuit and a second amplified signal input end of the loop compensation circuit, and is connected with the first switch circuit, the second switch circuit and the power supply circuit so as to be connected with the first amplified signal or the second amplified signal and output the compensation signal;
the second end of the first resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the power ground.
8. The constant-current constant-voltage output circuit according to claim 1, wherein the second switching circuit includes a second inverter and a second switch;
the input end of the second inverter is used as the input end of the control signal of the second switching circuit and is connected with the first switching circuit, the third switching circuit and the constant current operation circuit so as to be connected with the control signal;
the output end of the second inverter is connected with the control end of the second switch, and the first input and output end of the second switch is used as a first amplified signal input end of the second switch circuit and is connected with the constant voltage operation circuit so as to be connected with the first amplified signal; the second input/output end of the second switch is used as a first amplified signal output end of the second switch circuit and is connected with the first switch circuit, the loop compensation circuit and the power supply circuit so as to output the first amplified signal.
9. The constant-current constant-voltage output circuit according to any one of claims 1 to 5, wherein the first switch circuit includes a first switch; the third switch circuit comprises a third switch;
the first input and output end of the first switch is used as a second amplified signal input end of the first switch circuit and is connected with the constant current operation circuit so as to be connected with the second amplified signal; a second input/output end of the first switch is used as a second amplified signal output end of the first switch circuit and is connected with the second switch circuit, the loop compensation circuit and the power supply circuit so as to output the second amplified signal;
the first input and output end of the third switch is used as a second amplified signal input end of the third switch circuit and is connected with the first single-phase conducting circuit, the second switch circuit and the constant voltage operation circuit so as to be connected with the second amplified signal;
and the second input and output end of the third switch is used as a second amplified signal output end of the third switch circuit and is connected with the constant current operation circuit so as to output the second amplified signal.
10. A power supply chip comprising the constant current constant voltage output circuit according to any one of claims 1 to 9.
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| JP2003079139A (en) * | 2001-08-31 | 2003-03-14 | Victor Co Of Japan Ltd | Automatic switching constant current and constant voltage circuit |
| US20050134220A1 (en) * | 2003-11-21 | 2005-06-23 | Brohlin Paul L. | Area-efficient compensation circuit and method for voltage mode switching battery charger |
| JP5057902B2 (en) * | 2007-09-06 | 2012-10-24 | 株式会社リコー | Charge control circuit |
| CN103425167B (en) * | 2011-06-30 | 2015-07-22 | 华润矽威科技（上海）有限公司 | Constant voltage and constant current control circuit |
| CN102570837B (en) * | 2012-02-28 | 2014-09-03 | 矽力杰半导体技术(杭州)有限公司 | Constant voltage constant current control circuit and control method thereof |
| CN104158244B (en) * | 2014-08-06 | 2016-08-24 | 上海凌阳科技有限公司 | Single order constant current mode charging circuit and the changeable charging circuit of constant current-constant voltage mode |
| CN104615053B (en) * | 2015-01-19 | 2017-11-21 | 深圳市中科源电子有限公司 | A kind of transistor controls type electronic load control circuit |
| CN107742983B (en) * | 2017-11-29 | 2023-05-26 | 上海南麟电子股份有限公司 | Constant-current constant-voltage control module, voltage reducing circuit and compensation method for sharing compensation |
| CN207782663U (en) * | 2018-01-29 | 2018-08-28 | 深圳市创新微源半导体有限公司 | A kind of constant pressure and flow mode switching circuit |
| CN110212761A (en) * | 2019-06-21 | 2019-09-06 | 西北工业大学 | A kind of a variety of output mode conversion control circuits of Switching Power Supply |
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