CN220857626U - Linear power supply circuit, linear power supply and electronic equipment - Google Patents
Linear power supply circuit, linear power supply and electronic equipment Download PDFInfo
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Abstract
The application belongs to the technical field of electronic circuits, and provides a linear power supply circuit, a linear power supply and electronic equipment. The linear power supply circuit comprises a control module, a voltage generation module and an output module, wherein the control module is electrically connected with the output module and the voltage generation module respectively; the voltage generation module is used for outputting a first voltage to the control module, and when the linear power supply circuit is in short circuit, the control module is used for transmitting the first voltage to the output module so that the output module outputs preset current. The linear power supply circuit provided by the embodiment of the application solves the problems that the structure of an overcurrent protection circuit in the traditional linear power supply is complex, and a power tube in an output module can be completely turned off when overcurrent protection is triggered, so that the linear power supply has no load capacity.
Description
Technical Field
The present application relates to electronic circuits, and particularly to a linear power supply circuit, a linear power supply, and an electronic device.
Background
The linear power supply is widely applied to various electronic devices and comprises a control module and an output module, wherein the control module mainly comprises an operational amplifier. For the high-voltage operational amplifier, because the output short circuit problem exists, if no overcurrent protection exists, the field effect transistor in the high-voltage operational amplifier can be burnt out, so that an overcurrent protection circuit is required to be arranged, and because the field effect transistor in the high-voltage operational amplifier has the voltage withstand problem, the overcurrent protection circuit also needs a complex voltage conversion circuit, and when the overcurrent protection is triggered, the power tube in the output module can be completely turned off, so that the linear power supply has no load capacity.
Disclosure of utility model
The embodiment of the application provides a linear power supply circuit, a linear power supply and electronic equipment, which can solve the problems that the structure of an overcurrent protection circuit in the traditional linear power supply is complex, and a power tube in an output module can be completely turned off when overcurrent protection is triggered, so that the linear power supply has no load capacity.
In a first aspect, an embodiment of the present application provides a linear power supply circuit, including a control module, a voltage generation module, and an output module, where the control module is electrically connected to the output module and the voltage generation module respectively;
The voltage generation module is used for outputting a first voltage to the control module, and when the linear power supply circuit is in short circuit, the control module is used for transmitting the first voltage to the output module so that the output module outputs preset current.
In a possible implementation manner of the first aspect, the voltage generating module includes a first operational amplifying unit and a first feedback unit, where the first operational amplifying unit is electrically connected to the first feedback unit and the control module, respectively;
the first operational amplification unit is used for receiving a first reference voltage and a second voltage, and outputting the first voltage to the control module according to the first reference voltage and the second voltage; the first feedback unit is used for receiving a second reference voltage and the first voltage, and outputting the second voltage to the first operational amplification unit according to the second reference voltage and the first voltage.
In a possible implementation manner of the first aspect, the first operational amplifier unit includes a first operational amplifier, a first input terminal of the first operational amplifier is configured to receive the first reference voltage, a second input terminal of the first operational amplifier is electrically connected to the first feedback unit, and an output terminal of the first operational amplifier is electrically connected to the first feedback unit and the control module, respectively.
In a possible implementation manner of the first aspect, the first feedback unit includes a first resistor and a second resistor, a first end of the first resistor is electrically connected to the first operational amplifying unit and the control module, and a second end of the first resistor is electrically connected to a first end of the second resistor and the first operational amplifying unit, and a second end of the second resistor is used for receiving the second reference voltage.
In a possible implementation manner of the first aspect, the control module includes a second operational amplification unit and a second feedback unit, where the second operational amplification unit is electrically connected to the second feedback unit, the voltage generation module, and the output module, and the second feedback unit is electrically connected to the output module;
The voltage generation module is used for outputting the first voltage to the second operational amplification unit, when the linear power supply circuit works normally, the second operational amplification unit is used for receiving a third reference voltage and a third voltage, outputting a first control signal to the output module according to the third reference voltage and the third voltage, enabling the output module to adaptively adjust the output target voltage, and the second feedback unit is used for receiving the target voltage and outputting the third voltage to the second operational amplification unit according to the target voltage; when the linear power supply circuit is short-circuited, the second operational amplification unit is used for transmitting the first voltage to the output module so that the output module outputs preset current.
In one possible implementation manner of the first aspect, the second operational amplifying unit includes 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, a seventeenth field effect transistor, an eighteenth field effect transistor, a nineteenth field effect transistor, a twentieth field effect transistor, and a first current source, where a gate of the first field effect transistor, a gate of the second field effect transistor, a gate of the third field effect transistor, and a gate of the fourth field effect transistor are all configured to receive a first bias voltage, the source electrode of the first field effect tube, the source electrode of the second field effect tube, the source electrode of the third field effect tube, the source electrode of the fourth field effect tube and the drain electrode of the sixteenth field effect tube are all used for being electrically connected with a first power supply, the grid electrode of the fifth field effect tube, the grid electrode of the sixth field effect tube, the grid electrode of the seventh field effect tube and the grid electrode of the eighth field effect tube are all used for receiving a second bias voltage, the drain electrode of the first field effect tube is electrically connected with the source electrode of the fifth field effect tube, the drain electrode of the second field effect tube is electrically connected with the source electrode of the sixth field effect tube, the drain electrode of the third field effect tube is electrically connected with the source electrode of the seventh field effect tube, the drain electrode of the fourth field effect tube is electrically connected with the source electrode of the eighth field effect tube, the drain electrode of the fifth field effect tube is respectively electrically connected with the source electrode of the ninth field effect tube and the source electrode of the tenth field effect tube, the grid electrode of the ninth field effect tube is electrically connected with the second feedback unit, the grid electrode of the tenth field effect tube is used for receiving the third reference voltage, the drain electrode of the ninth field effect tube is electrically connected with the source electrode of the eleventh field effect tube and the drain electrode of the thirteenth field effect tube respectively, the drain electrode of the tenth field effect tube is electrically connected with the source electrode of the twelfth field effect tube and the drain electrode of the fourteenth field effect tube respectively, the grid electrode of the eleventh field effect tube and the grid electrode of the twelfth field effect tube are both used for receiving the third bias voltage, the drain electrode of the eleventh field effect tube is electrically connected with the grid electrode of the thirteenth field effect tube, the grid electrode of the fourteenth field effect tube and the drain electrode of the sixth field effect tube respectively, the drain electrode of the twelfth field effect tube is electrically connected with the drain electrode of the seventh field effect tube and the grid electrode of the fifteenth field effect tube respectively, the source electrode of the thirteenth field effect tube, the source electrode of the fourteenth field effect tube and the drain electrode of the fifteenth field effect tube are all used for grounding, the source electrode of the fifteenth field effect tube is respectively and electrically connected with the drain electrode of the eighth field effect tube and the grid electrode of the sixteenth field effect tube, the source electrode of the sixteenth field effect tube is electrically connected with the source electrode of the seventeenth field effect tube, the grid electrode of the seventeenth field effect tube is used for grounding, the drain electrode of the seventeenth field effect tube is respectively and electrically connected with the output module and the drain electrode of the twentieth field effect tube, the grid electrode of the twentieth field effect tube is respectively and electrically connected with the grid electrode of the nineteenth field effect tube, the drain electrode of the nineteenth field effect tube and the drain electrode of the eighteenth field effect tube, the grid electrode of the eighteenth field effect tube is used for grounding, the source electrode of the eighteenth field effect transistor is electrically connected with the first end of the first current source, the second end of the first current source is electrically connected with the first power source, and the drain electrode of the nineteenth field effect transistor and the drain electrode of the twentieth field effect transistor are electrically connected with the voltage generating module.
In a possible implementation manner of the first aspect, the second feedback unit includes a third resistor and a fourth resistor, a first end of the third resistor is electrically connected to the output module, a second end of the third resistor is electrically connected to a first end of the fourth resistor and the second operational amplifying unit, and a second end of the fourth resistor is used for grounding.
In a possible implementation manner of the first aspect, the output module includes a power tube and a second current source, a gate of the power tube is electrically connected with the control module, a source of the power tube is used for being grounded, a drain of the power tube is respectively electrically connected with a first end of the second current source and the control module, and a second end of the second current source is used for being electrically connected with a second power supply.
In a second aspect, an embodiment of the present application provides a linear power supply, including the linear power supply circuit of any one of the first aspects.
In a third aspect, an embodiment of the present application provides an electronic device, including the linear power supply according to the second aspect.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
The embodiment of the application provides a linear power supply circuit which comprises a control module, a voltage generation module and an output module, wherein the control module is respectively and electrically connected with the output module and the voltage generation module.
The voltage generation module is used for outputting a first voltage to the control module, and when the linear power supply circuit is in short circuit, the control module is used for transmitting the first voltage to the output module so that the output module outputs preset current.
When the linear power supply circuit is short-circuited, the control module transmits the first voltage output by the voltage generation module to the output module, and the output module outputs preset current according to the first voltage, so that the linear power supply circuit provided by the embodiment of the application can realize the current limiting function without setting an overcurrent protection circuit and has certain load capacity.
In summary, the linear power supply circuit provided by the embodiment of the application solves the problems that the structure of an overcurrent protection circuit in the traditional linear power supply is complex, and a power tube in an output module can be completely turned off when overcurrent protection is triggered, so that the linear power supply has no load capacity.
It will be appreciated that the advantages of the second to third aspects may be found in the relevant description of the first aspect, and are not described in detail herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a prior art linear power supply;
FIG. 2 is a schematic block diagram of a linear power supply circuit according to an embodiment of the present application;
FIG. 3 is a schematic block diagram of a linear power supply circuit provided in another embodiment of the application;
fig. 4 is a schematic circuit connection diagram of a linear power supply circuit according to an embodiment of the present application.
In the figure: 10. a control module; 11. a second operational amplification unit; 12. a second feedback unit; 20. a voltage generation module; 21. a first operational amplification unit; 22. a first feedback unit; 30. an output module; 40. a first power supply; 50. and a second power supply.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used in the present description and the appended claims, the term "if" may be interpreted in context as "when …" or "once" or "in response to a determination" or "in response to detection. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Fig. 1 shows a schematic block diagram of a conventional linear power supply, and as shown in fig. 1, the linear power supply includes a control module and an output module, where the control module outputs a control signal to the output module according to a target voltage VOUT, so that the output module adaptively adjusts the target voltage VOUT output by the output module. The control module mainly comprises an operational amplifier, and for the high-voltage operational amplifier, because of the output short circuit problem, if no overcurrent protection exists, the field effect transistor in the high-voltage operational amplifier can be burnt out, so that the linear power supply also comprises an overcurrent protection circuit, and the overcurrent protection circuit comprises a sampling resistor RS, a comparator CMP and a voltage conversion circuit as shown in fig. 1. The over-current protection circuit samples the current on the output module through the sampling resistor R2 and outputs a sampling voltage VSAMPLE to the comparator CMP, then the comparator CMP compares the sampling voltage VSAMPLE with the reference voltage VREF0 so as to realize over-current protection, when the over-current occurs, the over-current signal OCP output by the comparator CMP controls the field effect transistor LMP to be conducted and provides a high-level signal for the output module, and the power tube of the output module is completely turned off under the action of the high-level signal. The existing linear power supply has the following defects: firstly, in order to ensure the current capability of an output module, the resistance value of a sampling resistor RS is set to be very small, then a signal input by a comparator CMP is very small, and an offset error is very large, so that the threshold value of overcurrent protection is inaccurate; secondly, when the overcurrent protection is triggered, the power tube in the output module is completely turned off, so that the linear power supply has no problem of carrying capacity. Further, since the field effect transistor in the high voltage operational amplifier has a withstand voltage problem, the over-current protection circuit requires a complicated voltage conversion circuit.
In view of the above problems, an embodiment of the present application provides a linear power supply circuit, as shown in fig. 2, including a control module 10, a voltage generation module 20, and an output module 30, where the control module 10 is electrically connected to the output module 30 and the voltage generation module 20, respectively.
Specifically, the voltage generating module 20 is configured to output a first voltage V1 to the control module 10, and when the linear power circuit is operating normally, the control module 10 outputs a first control signal to the output module 30 according to the target voltage VOUT, so that the output module 30 adaptively adjusts the target voltage VOUT that is output by the output module 30. When the linear power circuit is shorted, the control module 10 is configured to transmit the first voltage V1 to the output module 30, so that the output module 30 outputs a preset current. The first voltage V1 is a negative voltage. The preset current is the maximum current output by the output module 30 when the linear power circuit is operating normally.
When the linear power supply circuit is short-circuited, the control module 10 transmits the first voltage V1 output by the voltage generating module 20 to the output module 30, and the output module 30 outputs a preset current according to the first voltage V1, so that the linear power supply circuit provided by the embodiment of the application can realize the current limiting function without setting an overcurrent protection circuit, and has a certain load capacity.
In summary, the linear power supply circuit provided by the embodiment of the application solves the problems that the structure of the overcurrent protection circuit in the traditional linear power supply is complex, and the power tube in the output module 30 can be completely turned off when the overcurrent protection is triggered, so that the linear power supply has no load capacity.
As shown in fig. 3, the voltage generating module 20 includes a first operational amplifying unit 21 and a first feedback unit 22, and the first operational amplifying unit 21 is electrically connected to the first feedback unit 22 and the control module 10, respectively.
Specifically, the first operational amplification unit 21 is configured to receive the first reference voltage VREF1 and the second voltage V2, and output the first voltage V1 to the control module 10 according to the first reference voltage VREF1 and the second voltage V2. The first feedback unit 22 is configured to receive the second reference voltage VREF2 and the first voltage V1, and output the second voltage V2 to the first operational amplification unit 21 according to the second reference voltage VREF2 and the first voltage V1.
As shown in fig. 4, the first operational amplifier unit 21 includes a first operational amplifier AMP, a first input terminal of the first operational amplifier AMP is configured to receive the first reference voltage VREF1, a second input terminal of the first operational amplifier AMP is electrically connected to the first feedback unit 22 and configured to receive the second voltage V2, and output terminals of the first operational amplifier AMP are respectively electrically connected to the first feedback unit 22 and the control module 10, and the first operational amplifier AMP is further configured to be electrically connected to the second power supply 50. Specifically, the first operational amplifier AMP outputs the first voltage V1 according to the first reference voltage VREF1 and the second voltage V2.
As shown in fig. 4, the first feedback unit 22 includes a first resistor R1 and a second resistor R2, wherein a first end of the first resistor R1 is electrically connected to the first operational amplifier unit 21 and the control module 10, a second end of the first resistor R1 is electrically connected to a first end of the second resistor R2 and the first operational amplifier unit 21, and a second end of the second resistor R2 is used for receiving the second reference voltage VREF2. As can be seen from fig. 4, the first end of the first resistor R1 is electrically connected to the output end of the first operational amplifier AMP and the control module 10, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the second input end of the first operational amplifier AMP.
Specifically, according to the "virtual short" and "virtual short" characteristics of the first operational amplifier AMP, the second voltage V2 is equal to the first reference voltage VREF1. Assuming that the resistance of the first resistor R1 is S1 and the resistance of the second resistor R2 is S2, the first voltage v1=vref 1 (s2+s1)/S2-VREF 2S 1/S2 can be obtained.
As shown in fig. 3, the control module 10 includes a second operational amplification unit 11 and a second feedback unit 12, the second operational amplification unit 11 is electrically connected to the second feedback unit 12, the voltage generation module 20, and the output module 30, and the second feedback unit 12 is electrically connected to the output module 30.
Specifically, the voltage generating module 20 is configured to output the first voltage V1 to the second operational amplifying unit 11, when the linear power circuit works normally, the second operational amplifying unit 11 is configured to receive the third reference voltage VREF3 and the third voltage V3, output the first control signal C1 to the output module 30 according to the third reference voltage VREF3 and the third voltage V3, so that the output module 30 adaptively adjusts the output target voltage VOUT, and the second feedback unit 12 is configured to receive the target voltage VOUT and output the third voltage V3 to the second operational amplifying unit 11 according to the target voltage VOUT. When the linear power circuit is shorted, the second operational amplifier 11 is configured to transmit the first voltage V1 to the output module 30, so that the output module 30 outputs a preset current.
As shown in fig. 4, the second operational amplifier 11 includes a first fet M1, a second fet M2, a third fet M3, a fourth fet M4, a fifth fet M5, a sixth fet M6, a seventh fet M7, an eighth fet M8, a ninth fet M9, a tenth fet M10, an eleventh fet M11, a twelfth fet M12, a thirteenth fet M13, a fourteenth fet M14, a fifteenth fet M15, a sixteenth fet M16, a seventeenth fet M17, an eighteenth fet M18, a nineteenth fet M19, a twentieth fet M20, and a first current source I1, the gates of the first fet M1, the gates of the second fet M2, the gates of the third fet M3, and the gates of the fourth fet M4 are all configured to receive a first bias voltage LPBIAS, the source electrode of the first field effect tube M1, the source electrode of the second field effect tube M2, the source electrode of the third field effect tube M3, the source electrode of the fourth field effect tube M4 and the drain electrode of the sixteenth field effect tube M16 are all electrically connected with the first power supply 40 and are used for receiving the voltage VDD, the grid electrode of the fifth field effect tube M5, the grid electrode of the sixth field effect tube M6, the grid electrode of the seventh field effect tube M7 and the grid electrode of the eighth field effect tube M8 are all used for receiving the second bias voltage LPBIAS, the drain electrode of the first field effect tube M1 is electrically connected with the source electrode of the fifth field effect tube M5, the drain electrode of the second field effect tube M2 is electrically connected with the source electrode of the sixth field effect tube M6, the drain electrode of the third field effect tube M3 is electrically connected with the source electrode of the seventh field effect tube M7, the drain electrode of the fourth field effect tube M4 is electrically connected with the source electrode of the eighth field effect tube M8, the drain electrode of the fifth field effect tube M5 is electrically connected with the source electrode of the ninth field effect tube M9 and the source electrode of the tenth field effect tube M10 respectively, the grid electrode of the ninth field effect tube M9 is electrically connected with the second feedback unit 12 and is used for receiving a third voltage V3, the grid electrode of the tenth field effect tube M10 is used for receiving a third reference voltage VREF3, the drain electrode of the ninth field effect tube M9 is respectively electrically connected with the source electrode of the eleventh field effect tube M11 and the drain electrode of the thirteenth field effect tube M13, the drain electrode of the tenth field effect tube M10 is respectively electrically connected with the source electrode of the twelfth field effect tube M12 and the drain electrode of the fourteenth field effect tube M14, the grid electrode of the eleventh field effect tube M11 and the grid electrode of the twelfth field effect tube M12 are respectively used for receiving a third bias voltage LNBIAS, the drain electrode of the eleventh field effect tube M11 is respectively electrically connected with the grid electrode of the thirteenth field effect tube M13, the grid electrode of the fourteenth field effect tube M14 and the drain electrode of the sixth field effect tube M6, the drain electrode of the twelfth field effect tube M12 is respectively electrically connected with the drain electrode of the seventh field effect tube M7 and the drain electrode of the fifteenth field effect tube M15, the source electrode of the thirteenth field effect tube M13, the source electrode of the fourteenth field effect tube M14 and the drain electrode of the fifteenth field effect tube M15 are all used for grounding, the source electrode of the fifteenth field effect tube M15 is respectively and electrically connected with the drain electrode of the eighth field effect tube M8 and the drain electrode of the sixteenth field effect tube M16, the source electrode of the sixteenth field effect tube M16 is electrically connected with the source electrode of the seventeenth field effect tube M17, the gate electrode of the seventeenth field effect tube M17 is used for grounding, the drain electrode of the seventeenth field effect tube M17 is respectively and electrically connected with the output module 30 and the drain electrode of the twentieth field effect tube M20, the gate electrode of the twentieth field effect tube M20 is respectively and electrically connected with the gate electrode of the nineteenth field effect tube M19, the drain electrode of the nineteenth field effect tube M19 and the drain electrode of the eighteenth field effect tube M18, the gate electrode of the eighteenth field effect tube M18 is used for grounding, the source electrode of the eighteenth field effect tube M18 is electrically connected with the first end of the first current source I1, the second end of the first current source I1 is electrically connected to the first power source 40, and the drain of the nineteenth fet M19 and the drain of the twentieth fet M20 are electrically connected to the voltage generating module 20. As can be seen from fig. 4, the drain of the nineteenth fet M19 and the drain of the twentieth fet M20 are electrically connected to the output terminal of the first operational amplifier AMP and the first terminal of the first resistor R1, respectively.
Specifically, when the linear power supply circuit works normally, the second operational amplification unit 11 adjusts the voltage at the GPF node according to the third voltage V3 and the third reference voltage VREF3, and further adjusts the first control signal C1 at the GP node to adaptively adjust the target voltage VOUT.
When the linear power circuit is shorted, the second operational amplifier 11 transmits the first voltage V1 output by the voltage generating module 20 to the output module 30, so that the output module 30 outputs a preset current.
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, the eighth field effect transistor M8, the ninth field effect transistor M9, the tenth field effect transistor M10, the fifteenth field effect transistor M15, the seventeenth field effect transistor M17 and the eighteenth field effect transistor M18 are PMOS (positive CHANNEL METAL Oxide Semiconductor ) field effect transistors, wherein 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, the eighth field effect transistor M8, the ninth field effect transistor M9, the tenth field effect transistor M10 and the fifteenth field effect transistor M15 are low-voltage PMOS transistors, and the seventeenth field effect transistor M17 and the eighteenth field effect transistor M18 are high-voltage PMOS transistors.
Illustratively, the eleventh, twelfth, thirteenth, fourteenth, sixteenth, nineteenth, and twentieth field-effect transistors M11, M12, M13, M14, M16, M19, and M20 are NMOS (n-metal-oxide-semiconductor) transistors, wherein the eleventh, twelfth, thirteenth, M13, fourteenth, and sixteenth field-effect transistors M11, M12, M16 are low-voltage NMOS transistors, and the nineteenth and twentieth field-effect transistors M19, M20 are high-voltage NMOS transistors.
As shown in fig. 4, the second feedback unit 12 includes a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 is electrically connected to the output module 30, a second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4 and the second operational amplifying unit 11, and a second end of the fourth resistor R4 is used for grounding. As can be seen from fig. 4, the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4 and the gate of the ninth fet M9, respectively. Specifically, the third resistor R3 and the fourth resistor R4 divide the target voltage VOUT to obtain a third voltage V3.
As shown in fig. 4, the output module 30 includes a power tube HMP and a second current source I2, the gate of the power tube HMP is electrically connected to the control module 10, the source of the power tube HMP is used for grounding, the drain of the power tube HMP is electrically connected to the first end of the second current source I2 and the control module 10, and the second end of the second current source I2 is used for being electrically connected to the second power source 50. As can be seen from fig. 4, the gate of the power transistor HMP is electrically connected to the drain of the seventeenth fet M17 and the drain of the twentieth fet M20, respectively. The drain electrode of the power tube HMP is electrically connected to the first end of the second current source I2 and the first end of the third resistor R3, respectively.
Specifically, when the linear power supply circuit works normally, the power tube HMP adaptively adjusts the output target voltage VOUT according to the first control signal C1 output by the control module 10.
When the linear power supply circuit is in short circuit, the voltage at the grid electrode of the power tube HMP is pulled down to the first voltage V1, so that the current capacity of the power tube HMP is controlled by the first voltage V1, and finally the control of the maximum current capacity is realized, so that the linear power supply circuit does not need to be provided with an overcurrent protection circuit, has a self current limiting function and has a certain load capacity.
The power tube HMP is a high-voltage PMOS tube, for example.
The working principle of the application is explained again with reference to fig. 4: when the linear power supply circuit is in short circuit, the voltage at the grid electrode of the power tube HMP is pulled down to the first voltage V1 by the twentieth field effect tube M20, namely the current capacity of the power tube HMP is controlled by the voltage between the grid sources, namely the first voltage V1, so that the control of the maximum current capacity is finally realized, an overcurrent protection circuit is not required to be arranged, the self-contained current limiting function is realized, and certain load capacity is realized.
According to the application, the current capacity of the power tube HMP and the voltage between the grid sources thereof are in a forward relation, and the purpose of controlling the current capacity is finally realized, and the first voltage V1 output by the first operational amplifier AMP can be regulated according to actual conditions, so that the current capacity of the power tube HMP is regulated.
The embodiment of the application also provides a linear power supply, which comprises the linear power supply circuit. Because the linear power supply provided by the embodiment of the application comprises the linear power supply circuit, when the linear power supply is in short circuit, the voltage generation module in the linear power supply circuit is used for outputting the first voltage to the control module, and the control module in the linear power supply circuit is used for transmitting the first voltage to the output module in the linear power supply circuit so that the output module outputs the preset current. Therefore, the linear power supply provided by the embodiment of the application has a current limiting function and a certain load capacity.
The embodiment of the application also provides electronic equipment, which comprises the linear power supply. The electronic device provided by the embodiment of the application has the current limiting function and certain carrying capacity when short circuit occurs, and the specific working principle is referred to the description of the working principle of the linear power supply, and is not repeated herein.
The electronic device is a display-type electronic device, and may specifically be an electronic device with a display function, such as a mobile phone, a tablet computer, a television, and the like.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will 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. The linear power supply circuit is characterized by comprising a control module, a voltage generation module and an output module, wherein the control module is electrically connected with the output module and the voltage generation module respectively;
The voltage generation module is used for outputting a first voltage to the control module, and when the linear power supply circuit is in short circuit, the control module is used for transmitting the first voltage to the output module so that the output module outputs preset current.
2. The linear power supply circuit of claim 1, wherein the voltage generation module comprises a first operational amplification unit and a first feedback unit, the first operational amplification unit being electrically connected to the first feedback unit and the control module, respectively;
the first operational amplification unit is used for receiving a first reference voltage and a second voltage, and outputting the first voltage to the control module according to the first reference voltage and the second voltage; the first feedback unit is used for receiving a second reference voltage and the first voltage, and outputting the second voltage to the first operational amplification unit according to the second reference voltage and the first voltage.
3. The linear power supply circuit of claim 2, wherein the first operational amplifier unit comprises a first operational amplifier, a first input terminal of the first operational amplifier is configured to receive the first reference voltage, a second input terminal of the first operational amplifier is electrically connected to the first feedback unit, and an output terminal of the first operational amplifier is electrically connected to the first feedback unit and the control module, respectively.
4. The linear power supply circuit of claim 2, wherein the first feedback unit comprises a first resistor and a second resistor, a first end of the first resistor is electrically connected to the first operational amplifier unit and the control module, respectively, a second end of the first resistor is electrically connected to a first end of the second resistor and the first operational amplifier unit, respectively, and a second end of the second resistor is configured to receive the second reference voltage.
5. The linear power supply circuit of claim 1, wherein the control module comprises a second operational amplification unit and a second feedback unit, the second operational amplification unit being electrically connected to the second feedback unit, the voltage generation module, and the output module, respectively, the second feedback unit being electrically connected to the output module;
The voltage generation module is used for outputting the first voltage to the second operational amplification unit, when the linear power supply circuit works normally, the second operational amplification unit is used for receiving a third reference voltage and a third voltage, outputting a first control signal to the output module according to the third reference voltage and the third voltage, enabling the output module to adaptively adjust the output target voltage, and the second feedback unit is used for receiving the target voltage and outputting the third voltage to the second operational amplification unit according to the target voltage; when the linear power supply circuit is short-circuited, the second operational amplification unit is used for transmitting the first voltage to the output module so that the output module outputs preset current.
6. The linear power supply circuit of claim 5, wherein the second operational amplifier unit comprises a first FET, a second FET, a third FET, a fourth FET, a fifth FET, a sixth FET, a seventh FET, an eighth FET, a ninth FET, a tenth FET, an eleventh FET, a twelfth FET, a thirteenth FET, a fourteenth FET, a fifteenth FET, a sixteenth FET, a seventeenth FET, an eighteenth FET, a nineteenth FET, a twentieth FET, and a first current source, the gates of the first FET, the gates of the second FET, the gates of the third FET, and the gates of the fourth FET are all configured to receive a first bias voltage, the source electrode of the first field effect tube, the source electrode of the second field effect tube, the source electrode of the third field effect tube, the source electrode of the fourth field effect tube and the drain electrode of the sixteenth field effect tube are all electrically connected with a first power supply, the grid electrode of the fifth field effect tube, the grid electrode of the sixth field effect tube, the grid electrode of the seventh field effect tube and the grid electrode of the eighth field effect tube are all used for receiving a second bias voltage, the drain electrode of the first field effect tube is electrically connected with the source electrode of the fifth field effect tube, the drain electrode of the second field effect tube is electrically connected with the source electrode of the sixth field effect tube, the drain electrode of the third field effect tube is electrically connected with the source electrode of the seventh field effect tube, the drain electrode of the fourth field effect tube is electrically connected with the source electrode of the eighth field effect tube, the drain electrode of the fifth field-effect transistor is electrically connected with the source electrode of the ninth field-effect transistor and the source electrode of the tenth field-effect transistor respectively, the gate electrode of the ninth field-effect transistor is electrically connected with the second feedback unit, the gate electrode of the tenth field-effect transistor is used for receiving the third reference voltage, the drain electrode of the ninth field-effect transistor is electrically connected with the source electrode of the eleventh field-effect transistor and the drain electrode of the thirteenth field-effect transistor respectively, the drain electrode of the tenth field-effect transistor is electrically connected with the source electrode of the twelfth field-effect transistor and the drain electrode of the fourteenth field-effect transistor respectively, the gate electrode of the eleventh field-effect transistor and the gate electrode of the twelfth field-effect transistor are both used for receiving a third bias voltage, the drain electrode of the eleventh field-effect transistor is electrically connected with the gate electrode of the thirteenth field-effect transistor, the gate electrode of the fourteenth field-effect transistor and the drain electrode of the thirteenth field-effect transistor respectively, the drain electrode of the twelfth field-effect transistor is electrically connected with the drain electrode of the thirteenth field-effect transistor and the drain electrode of the thirteenth field-effect transistor respectively, the seventeenth field-effect transistor is electrically connected with the drain electrode of the seventeenth field-effect transistor and the seventeenth field-effect transistor, the seventeenth field-effect transistor and the seventeenth field-effect transistor are connected with the drain electrode of the seventeenth field-effect transistor respectively, the seventeenth field-effect transistor and the seventeenth field-effect transistor respectively, the drain electrode of the seventeenth field-effect transistor are connected with the drain electrode of the seventeenth field-effect transistor respectively, the seventeenth field-transistor and the drain electrode of the seventeenth field-effect transistor and the seventeenth field-effect transistor respectively, the drain electrode and the seventeenth field-transistor are connected with the drain electrode of the seventeenth field-transistor respectively, the drain electrode and the seventeenth field-transistor and the fifth field-field transistor respectively, the drain electrode of the nineteenth field effect transistor is electrically connected with the drain electrode of the eighteenth field effect transistor, the grid electrode of the eighteenth field effect transistor is used for being grounded, the source electrode of the eighteenth field effect transistor is electrically connected with the first end of the first current source, the second end of the first current source is electrically connected with the first power supply, and the drain electrodes of the nineteenth field effect transistor and the twenty-first field effect transistor are electrically connected with the voltage generating module.
7. The linear power supply circuit of claim 5, wherein the second feedback unit comprises a third resistor and a fourth resistor, a first end of the third resistor is electrically connected to the output module, a second end of the third resistor is electrically connected to the first end of the fourth resistor and the second operational amplifier unit, respectively, and a second end of the fourth resistor is used for grounding.
8. The linear power supply circuit of any one of claims 1-7, wherein the output module comprises a power tube and a second current source, wherein a gate of the power tube is electrically connected to the control module, a source of the power tube is for grounding, a drain of the power tube is electrically connected to a first end of the second current source and the control module, respectively, and a second end of the second current source is for electrically connecting to a second power source.
9. A linear power supply comprising the linear power supply circuit of any one of claims 1-8.
10. An electronic device comprising the linear power supply of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322612421.7U CN220857626U (en) | 2023-09-25 | 2023-09-25 | Linear power supply circuit, linear power supply and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322612421.7U CN220857626U (en) | 2023-09-25 | 2023-09-25 | Linear power supply circuit, linear power supply and electronic equipment |
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| CN220857626U true CN220857626U (en) | 2024-04-26 |
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| CN202322612421.7U Active CN220857626U (en) | 2023-09-25 | 2023-09-25 | Linear power supply circuit, linear power supply and electronic equipment |
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| CN (1) | CN220857626U (en) |
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