CN118589865B - Power output control circuit and switching power supply - Google Patents
Power output control circuit and switching power supply Download PDFInfo
- Publication number
- CN118589865B CN118589865B CN202411089642.3A CN202411089642A CN118589865B CN 118589865 B CN118589865 B CN 118589865B CN 202411089642 A CN202411089642 A CN 202411089642A CN 118589865 B CN118589865 B CN 118589865B
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- output
- signal
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 85
- 238000005070 sampling Methods 0.000 claims abstract description 54
- 239000003990 capacitor Substances 0.000 claims description 82
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 19
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007257 malfunction Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000005669 field effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 101150037009 pin1 gene Proteins 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101100520142 Caenorhabditis elegans pin-2 gene Proteins 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The application relates to the technical field of switching power supplies, in particular to a power supply output control circuit and a switching power supply, wherein the switching power supply comprises a power supply input interface, a multipath power supply output control branch and a plurality of power supply output interfaces; each power output control branch circuit comprises: the first end of the signal detection circuit is connected with the input circuit and is used for carrying out signal sampling on the power supply signal and detecting the power supply signal according to the sampled signal; the first end of the control circuit is connected with the second end of the signal detection circuit, and the control circuit is used for generating a control signal according to a signal detection result output by the signal detection circuit; the switch circuit is connected to the positive electrode wire, and is also connected to the second end of the control circuit, and the switch circuit is used for disconnecting the input circuit from the output circuit when receiving the turn-off control signal of the control circuit. The switching power supply of the application can simplify the circuit structure and improve the reliability.
Description
Technical Field
The present application relates to the field of switching power supply technologies, and in particular, to a power output control circuit and a switching power supply.
Background
The switching power supply is used for outputting required voltage or current for external electric equipment. When supplying power to a plurality of electric devices at the same time, a plurality of switching power supplies or a plurality of conversion devices are added at the output end of a single switching power supply to realize the power supply to the plurality of electric devices. At present, in order to reduce the number of switching power supplies, a plurality of conversion devices are added at the output end of a single switching power supply to output corresponding voltages or currents to a plurality of electric devices in the related art, but the plurality of conversion devices are added at the single switching power supply, so that the structure of the switching power supply is more complex, the electric devices can be mutually influenced, the normal working condition of the whole switching power supply can be influenced when a certain electric device is easy to fail, and the reliability of the switching power supply is reduced.
Disclosure of Invention
The application provides a power output control circuit and a switching power supply, which can solve the problems of complex structure and low reliability of the switching power supply caused by adding a plurality of conversion devices in a single switching power supply in the related art.
In a first aspect, the present application provides a switching power supply, where the switching power supply includes a power input interface, a multi-path power output control branch, and a plurality of power output interfaces, a first end of each power output control branch is connected to the power input interface, and a second end of each power output control branch is connected to a corresponding power output interface; each power output control branch circuit comprises; the input circuit is connected with the power input interface and is used for receiving a power signal input to the power input interface; the positive electrode interface of the input circuit is connected with the positive electrode interface of the output circuit through a positive electrode wire, the negative electrode interface of the input circuit is connected with the negative electrode interface of the output circuit through a negative electrode wire, and the output circuit is used for being connected with the power output interface corresponding to the power output control branch circuit; the first end of the signal detection circuit is connected with the input circuit and is at least used for signal sampling of the power supply signal and detecting the power supply signal according to the sampled signal; the first end of the control circuit is connected with the second end of the signal detection circuit, and the control circuit is used for generating a control signal according to a signal detection result output by the signal detection circuit; the switch circuit is connected to the positive electrode line, is also connected with the second end of the control circuit, and is used for disconnecting the connection between the input circuit and the output circuit when receiving a turn-off control signal of the control circuit, and is used for conducting the connection between the input circuit and the output circuit when receiving a turn-on control signal sent by the control circuit so as to output the power supply signal from the output circuit.
In some embodiments, the signal detection circuit includes a sampling unit, an amplifying unit, and a first comparing unit, where a first end of the sampling unit is connected to the input circuit, a second end of the sampling unit is connected to a first end of the amplifying unit, a second end of the amplifying unit is connected to a first end of the first comparing unit, and a second end of the first comparing unit is connected to a first end of the control circuit; the sampling unit is used for performing signal sampling on the power supply signal; the amplifying unit is used for amplifying the sampling signal output by the sampling unit; the first comparison unit is used for detecting the signal of the amplified sampling signal output by the amplifying unit to obtain the signal detection result.
In some embodiments, the input circuit further comprises a first capacitor, the sampling unit comprises a first resistor, a second capacitor, and a third capacitor; the first capacitor is connected between the positive electrode interface and the negative electrode interface of the input circuit, the first end of the first resistor is connected with the positive electrode interface of the input circuit, the second end of the first resistor is connected with the positive electrode wire, the first end of the second capacitor is connected with the first end of the first resistor, the second end of the second capacitor is connected with the negative electrode interface of the input circuit, the first end of the third capacitor is connected with the second end of the first resistor, and the second end of the third capacitor is connected with the negative electrode interface of the input circuit.
In some embodiments, the amplifying unit includes a second resistor, a third resistor, a fourth capacitor, a fourth resistor, a fifth capacitor, and an operational amplifier; the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the non-inverting input end of the operational amplifier; the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the inverting input end of the operational amplifier; the fourth capacitor is connected between the non-inverting input end and the inverting input end of the operational amplifier; the first end of the fourth resistor is connected with the output end of the operational amplifier, the second end of the fourth resistor is connected with the first end of the first comparison unit, and the fifth resistor and the fifth capacitor are respectively connected between the second end of the fourth resistor and the negative electrode line.
In some embodiments, the first comparison unit includes a sixth resistor, a seventh resistor, a sixth capacitor, a seventh capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eighth capacitor, and a first comparator; the first end of the sixth resistor is connected with a reference power supply, the second end of the sixth resistor is connected with the inverting input end of the first comparator, the seventh resistor is connected between the inverting input end of the first comparator and the negative electrode wire, and the non-inverting input end of the first comparator is connected with the second end of the amplifying unit; the sixth capacitor is connected between the non-inverting input end and the inverting input end of the first comparator; the seventh capacitor and the eighth resistor are connected in series and then are connected between the inverting input end and the output end of the first comparator, the first end of the ninth resistor is connected with the output end of the first comparator, the second end of the ninth resistor is connected with the first end of the control circuit, and the tenth resistor and the eighth capacitor are respectively connected between the second end of the ninth resistor and the negative electrode line.
In some embodiments, the control circuit includes a first switching unit, a second comparing unit, and a second switching unit; the first end of the first switch unit is connected with the second end of the signal detection circuit, the second end of the first switch unit is connected with the first input end of the second comparison unit, the output end of the second comparison unit is connected with the first end of the second switch unit, the second input end of the second comparison unit is connected with the first power supply end, and the second end of the second switch unit is connected with the switch circuit; the first switch unit is used for outputting a first voltage value to a first input end of the second comparison unit when a signal detection result output by the signal detection circuit is a high-level signal; the second comparing unit is configured to perform voltage comparison according to the first voltage value and a second voltage value input to a second input end of the second comparing unit by the first power supply end, and output a conducting signal to the second switching unit when the second voltage value is greater than the first voltage value; the second switch unit is used for outputting the turn-off control signal to the switch circuit according to the turn-on signal.
In some embodiments, the first switching unit includes a first switching tube, the second comparing unit includes a second comparator, a first diode, an eleventh resistor, a twelfth resistor, a ninth capacitor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor, and the second switching unit includes a second switching tube and a sixteenth resistor; the first end of the first switching tube is connected with the second end of the signal detection circuit, the second end of the first switching tube is respectively connected with the second power supply end and the cathode of the first diode, and the third end of the first switching tube is connected with the negative electrode wire; the anode of the first diode is connected with the inverting input end of the second comparator; the first end of the eleventh resistor is connected with the first power supply end, the second end of the eleventh resistor is connected with the inverting input end of the second comparator, the first end of the twelfth resistor is connected with the first power supply end, and the second end of the twelfth resistor is connected with the non-inverting input end of the second comparator; the ninth capacitor is connected between the inverting input end of the second comparator and the negative electrode line, the thirteenth resistor is connected between the non-inverting input end of the second comparator and the negative electrode line, and the fourteenth resistor is connected between the non-inverting input end of the second comparator and the output end; the first end of the fifteenth resistor is connected with the output end of the second comparator, and the second end of the fifteenth resistor is connected with the first end of the second switching tube; the second end of the second switching tube is connected with the switching circuit, the third end of the second switching tube is connected with the negative electrode wire, and the sixteenth resistor is connected between the first end and the third end of the second switching tube.
In some embodiments, the switching circuit includes a third switching unit including a third switching tube, a seventeenth resistor, a second diode, a third diode, an eighteenth resistor, and a nineteenth resistor, and a fourth switching unit including a fourth switching tube, a twentieth resistor, and a twenty-first resistor; the first end of the third switching tube is connected with the second end of the second switching tube, and the second end of the third switching tube is connected with the second power supply end; the seventeenth resistor is connected between the first end and the second end of the third switching tube; the anode of the second diode is connected with the first end of the third switch tube, the cathode of the second diode is connected with the second end of the first switch tube, the cathode of the third diode is connected to a common end between the first end of the third switch tube and the anode of the second diode, the anode of the third diode is connected with the first end of the eighteenth resistor, the second end of the eighteenth resistor is connected with the first end of the nineteenth resistor, and the second end of the nineteenth resistor is connected with the third end of the third switch tube; the first end of the fourth switching tube is connected with the first end of the twentieth resistor, the second end of the twentieth resistor is connected with the second end of the eighteenth resistor, the first end of the twenty-first resistor is connected with the second end of the twentieth resistor, the second end of the twenty-first resistor is connected with the third end of the fourth switching tube, and the second end and the third end of the fourth switching tube are connected in series on the positive electrode line.
In some embodiments, the fourth switching tube is an N-type switching tube.
In a second aspect, the present application further provides a power output control circuit, which is applied to a switching power supply, where the switching power supply includes a power input interface and a plurality of power output interfaces; the power output control circuit includes: the input circuit is connected with the power input interface and is used for receiving a power signal input to the power input interface; the positive electrode interface of the input circuit is connected with the positive electrode interface of the output circuit through a positive electrode wire, the negative electrode interface of the input circuit is connected with the negative electrode interface of the output circuit through a negative electrode wire, and the output circuit is used for being connected with a power output interface corresponding to the power output control circuit; the first end of the signal detection circuit is connected with the input circuit and is at least used for signal sampling of the power supply signal and detecting the power supply signal according to the sampled signal; the first end of the control circuit is connected with the second end of the signal detection circuit, and the control circuit is used for generating a control signal according to a signal detection result output by the signal detection circuit; the switch circuit is connected to the positive electrode line, is also connected with the second end of the control circuit, and is used for disconnecting the connection between the input circuit and the output circuit when receiving a turn-off control signal of the control circuit, and is used for conducting the connection between the input circuit and the output circuit when receiving a turn-on control signal sent by the control circuit so as to output the power supply signal from the output circuit.
The application discloses a power supply output control circuit and a switching power supply, wherein a plurality of power supply output control branches are arranged, each power supply output control branch is provided with a signal detection circuit, a control circuit and a switching circuit, a signal detection circuit can sample power supply signals and detect the power supply signals according to the sampled signals, the control circuit generates control signals according to the signal detection results output by the signal detection circuit, and when receiving the turn-off control signals of the control circuit, the switching circuit disconnects the connection between the input circuit and the output circuit, and can realize automatic disconnection between the input circuit and the output circuit when detecting overcurrent and short circuit of the power supply signals, so that each power supply output control branch has an independent turn-off protection function, the circuit structure can be simplified, the plurality of power supply output interfaces can be isolated, the normal work of the whole switching power supply can be prevented from being influenced when a certain electric equipment fails, and the reliability of the switching power supply is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first switching power supply according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a second switching power supply according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first power output control branch according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second power output control branch according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a third power output control branch according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a fourth power output control branch according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a fifth power output control branch according to an embodiment of the present application;
Fig. 8 is a schematic structural diagram of a first power output control circuit according to an embodiment of the present application;
Fig. 9 is a schematic structural diagram of a second power output control circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
At present, in order to reduce the number of switching power supplies, a plurality of conversion devices are added to an output end of a single switching power supply to output corresponding voltages or currents to a plurality of electric devices, but a plurality of conversion devices (for example, transformers and balun) are added to the single switching power supply, so that the structure of the switching power supply is more complex, the electric devices can be mutually influenced, the normal working condition of the whole switching power supply can be influenced when a certain electric device fails easily, and the reliability of the switching power supply is reduced.
In order to solve the technical problem, the embodiment of the application provides a power output control circuit and a switching power supply, wherein a signal detection circuit, a control circuit and a switching circuit are arranged in each power output control branch, the signal detection circuit is used for sampling power signals and detecting the power signals according to the sampled signals, the control circuit is used for generating control signals according to the signal detection result output by the signal detection circuit, and the switching circuit is used for disconnecting the input circuit from the output circuit when receiving the turn-off control signals of the control circuit, so that the connection between the input circuit and the output circuit can be automatically disconnected when the power signals are detected to be over-current and short-circuited, each power output control branch has an independent turn-off protection function, the circuit structure can be simplified, the multiple power output interfaces can be isolated, the normal operation of the whole switching power supply can be prevented from being influenced when a certain electric equipment fails, and the reliability of the switching power supply is effectively improved. The circuit structure and the operation principle of the switching power supply will be described in detail.
Referring to fig. 1, fig. 1 is a schematic diagram of a first switching power supply 100 according to an embodiment of the application. As shown in fig. 1, the switching power supply 100 may include a power input interface 10, a multiple power output control branch 20, and a plurality of power output interfaces 30. Wherein, a first end of each power output control branch 20 is connected with the power input interface 10, and a second end of each power output control branch 20 is connected with the corresponding power output interface 30. Switching power supply 100 is a single-input, multiple-output switching power supply for powering external powered device 40 via one or more power output interfaces 30. The number of power output control branches 20 is the same as the number of power output interfaces 30.
In the embodiment of the present application, the switching power supply 100 is a single-input and multiple-output switching power supply. For example, when the switching power supply 100 is a 4-way output, if the input power supply of the switching power supply 100 is a voltage of 12V and a current of 20A, the output power supplies may be respectively: OUT1:12V/5A; OUT2:12V/5A; OUT3:12V/5A; OUT4:12V/5A.
The power output control branch 20 is configured to receive the power input from the power input interface and determine whether to output the power from the power output interface. For example, the power output control branch 20 may disconnect the connection between the power input interface and the corresponding power output interface by detecting whether the power supply is abnormal, and when detecting that the power supply signal is abnormal (such as overcurrent, short circuit, etc.), so as to implement that each output of the switching power supply 10 has an independent output turn-off protection function.
Wherein, the circuit structure of each power output control branch 20 is the same. In the embodiment of the present application, one of the power output control branches 20 is taken as an example, and the circuit structure and the working principle of the power output control branch 20 are described in detail.
Referring to fig. 2, fig. 2 is a schematic diagram of a second switching power supply 100 according to an embodiment of the application. As shown in fig. 2, the power output control branch 20 may include an input circuit 200, an output circuit 201, a signal detection circuit 202, a control circuit 203, and a switch circuit 204.
The input circuit 200 is connected to the power input interface 10, and is configured to receive a power signal input to the power input interface 10. The positive electrode interface v0+ of the input circuit 200 is connected to the positive electrode interface Vout of the output circuit 201 via a positive electrode line, the negative electrode interface V0-of the input circuit 200 is connected to the negative electrode interface GND of the output circuit 201 via a negative electrode line, and the output circuit 201 is configured to be connected to the power output interface 30 corresponding to the power output control branch 20.
The first end of the signal detection circuit 202 is connected to the input circuit 200, and is at least used for signal sampling of the power supply signal, and detecting the power supply signal according to the sampled signal. By way of example, it is possible to detect whether the power supply signal is over-current or whether the power supply signal is over-voltage, etc.
A first terminal of the control circuit 203 is connected to a second terminal of the signal detection circuit 202, and the control circuit 203 is configured to generate a control signal according to a signal detection result output by the signal detection circuit 202.
The signal detection result may include both a signal normal case and a signal abnormal case, for example. When the power signal is normal, the control signal generated by the control circuit 203 is an on control signal, and when the power signal is abnormal, the control signal generated by the control circuit 203 is an off control signal. For example, the on control signal is a high level signal, and the off control signal is a low level signal. For another example, the on control signal is a low level signal and the off control signal is a high level signal.
The switch circuit 204 is connected to the positive line, the switch circuit 204 is further connected to the second terminal of the control circuit 203, and the switch circuit 204 is configured to disconnect the input circuit 200 from the output circuit 201 when receiving the off control signal of the control circuit 203, and to turn on the connection between the input circuit 200 and the output circuit 201 when receiving the on control signal sent by the control circuit 203, so as to output the power supply signal from the output circuit 201.
When the switch circuit 204 disconnects the input circuit 200 from the output circuit 201, the power signal cannot be output through the power output interface 30, so that the power output control branch 20 can perform a protection shutdown function when the current is too large and short-circuited due to the failure of the electric device.
In the above embodiment, by setting the multiple power output control branches 20 in the switching power supply 100, each power output control branch 20 is provided with the signal detection circuit 202, the control circuit 203 and the switching circuit 204, the signal detection circuit 202 can sample the power signal and detect the power signal according to the sampled signal, the control circuit 203 generates the control signal according to the signal detection result output by the signal detection circuit 202, and the switching circuit 204 disconnects the input circuit 200 from the output circuit 201 when receiving the turn-off control signal of the control circuit 203, so that the connection between the input circuit 200 and the output circuit 201 can be automatically disconnected when detecting the overcurrent and the short circuit of the power signal, so that each power output control branch 20 has an independent turn-off protection function, not only the circuit structure can be simplified, but also the multiple power output interfaces 30 can be isolated, and the normal operation of the whole switching power supply 100 can be prevented from being affected when some electric equipment fails, thereby effectively improving the reliability of the switching power supply 100.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a first power output control branch 20 according to an embodiment of the application. As shown in fig. 3, the signal detection circuit 202 includes a sampling unit 2020, an amplifying unit 2021 and a first comparing unit 2022, wherein a first end of the sampling unit 2020 is connected to the input circuit 200, a second end of the sampling unit 2020 is connected to a first end of the amplifying unit 2021, a second end of the amplifying unit 2021 is connected to a first end of the first comparing unit 2022, and a second end of the first comparing unit 2022 is connected to a first end of the control circuit 203.
The sampling unit 2020 is configured to perform signal sampling on a power supply signal. An amplifying unit 2021 is configured to amplify the sampled signal output by the sampling unit 2020. A first comparing unit 2022 is configured to perform signal detection on the amplified sampling signal output by the amplifying unit 2021, obtain a signal detection result, and output the signal detection result to the control circuit 203.
For example, the sampling unit 2020 may perform voltage signal acquisition on the power signal to obtain a current value in the power signal, and convert the current value into a voltage value through a resistor.
For example, since the voltage value sampled by the sampling unit 2020 is small, it is necessary to amplify the voltage value to improve the accuracy of the subsequent comparison according to the voltage value.
Illustratively, the first comparing unit 2022 may compare the amplified sampling signal with a reference signal to obtain a signal detection result. For example, the reference signal may include a reference voltage, and the first comparing unit 2022 may compare the voltage value in the amplified sampling signal with the reference voltage; when the voltage value in the amplified sampling signal is greater than the reference voltage, the first comparing unit 2022 outputs a high-level signal for indicating that the power supply signal is a signal abnormality; when the voltage value in the amplified sampling signal is less than or equal to the reference voltage, the first comparing unit 2022 outputs a low-level signal for indicating that the power supply signal is normal. Of course, the first comparing unit 2022 may output a low-level signal for indicating that the power supply signal is abnormal when the voltage value in the amplified sampling signal is greater than the reference voltage, and may output a high-level signal for indicating that the power supply signal is normal when the voltage value in the amplified sampling signal is less than or equal to the reference voltage. The reference voltage may be set according to actual conditions, and specific values are not limited herein.
In the above embodiment, by providing the sampling unit 2020, the amplifying unit 2021, and the first comparing unit 2022 in the signal detecting circuit 202, functions of signal acquisition, signal amplification, and signal detection can be sequentially implemented, and a signal detection result is output to the control circuit 203.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second power output control branch 20 according to an embodiment of the application. As shown in fig. 4, the input circuit 200 further includes a first capacitor C1, and the sampling unit 2020 includes a first resistor R1, a second capacitor C2 and a third capacitor C3.
The first capacitor C1 is connected between the positive electrode interface v0+ and the negative electrode interface V0-of the input circuit 200, the first end of the first resistor R1 is connected with the positive electrode interface v0+ of the input circuit 200, the second end of the first resistor R1 is connected with the positive electrode wire, the first end of the second capacitor C2 is connected with the first end of the first resistor R1, the second end of the second capacitor C2 is connected with the negative electrode interface V0-of the input circuit 200, the first end of the third capacitor C3 is connected with the second end of the first resistor R1, and the second end of the third capacitor C3 is connected with the negative electrode interface V0-of the input circuit 200.
The first resistor R1 is a sampling resistor, and the sampling unit 2020 may collect a voltage drop across the first resistor R1. The first capacitor C1 is a bus capacitor, and is configured to filter a power signal input to the input circuit 200; the second capacitor C2 is used for filtering the power supply signal input to the first resistor R1, and the third capacitor C3 is used for filtering the power supply signal output by the first resistor R1.
It should be noted that, in the embodiment of the present application, the sampling unit 2020 may include a differential sampling circuit for converting a current signal into a voltage signal through the first resistor R1 for sampling.
In some embodiments, as shown in fig. 4, the amplifying unit 2021 may include a second resistor R2, a third resistor R3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, and an operational amplifier U1.
Specifically, the first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end of the second resistor R2 is connected to the non-inverting input terminal of the operational amplifier U1. The first end of the third resistor R3 is connected with the second end of the first resistor R1, and the second end of the third resistor R3 is connected with the inverting input end of the operational amplifier U1; the fourth capacitor C4 is connected between the non-inverting input terminal and the inverting input terminal of the operational amplifier U1. The second resistor R2 is used for limiting the voltage of the non-inverting input terminal of the operational amplifier U1, and the third resistor R3 is used for limiting the voltage of the inverting input terminal of the operational amplifier U1. The fourth capacitor C4 is used for reducing interference of the high-frequency ac signal and interference of the dc pulse interference signal on the operational amplifier U1, and avoiding malfunction of the operational amplifier U1.
The first end of the fourth resistor R4 is connected to the output end of the operational amplifier U1, the second end of the fourth resistor R4 is connected to the first end of the first comparing unit 2022, and the fifth resistor R2 and the fifth capacitor C5 are respectively connected between the second end of the fourth resistor R4 and the negative line. It should be noted that the fourth resistor R4, the fifth resistor R2, and the fifth capacitor C5 jointly implement a filtering function, and are configured to filter the amplified sampling signal and output the filtered sampling signal to the first end of the first comparing unit 2022.
The amplification factor of the operational amplifier U1 may be set according to practical situations, and specific values are not limited herein. For example, the amplification factor of the operational amplifier U1 may be 50 times.
In the above embodiment, by providing the operational amplifier U1 in the amplifying unit 2021, signal amplification of the sampling signal output by the sampling unit 2020 by the operational amplifier U1 can be achieved.
In some embodiments, as shown in fig. 4, the first comparing unit 2022 may include a sixth resistor R6, a seventh resistor R7, a sixth capacitor C6, a seventh capacitor C7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighth capacitor C8, and a first comparator U2.
The first end of the sixth resistor R6 is connected to the reference power V REF, the second end of the sixth resistor R6 is connected to the inverting input end of the first comparator U2, the seventh resistor R7 is connected between the inverting input end of the first comparator U2 and the negative line, and the non-inverting input end of the first comparator U2 is connected to the second end of the amplifying unit 2021. The sixth resistor R6 is used to limit the voltage input to the inverting input terminal of the first comparator U2. The seventh resistor R7 is used to limit the current input to the inverting input terminal of the first comparator U2.
The sixth capacitor C6 is connected between the non-inverting input terminal and the inverting input terminal of the first comparator U2. The sixth capacitor C6 is configured to reduce interference of the high-frequency ac signal and interference of the dc pulse interference signal on the first comparator U2, so as to avoid malfunction of the first comparator U2.
The seventh capacitor C7 and the eighth resistor R8 are connected in series and then connected between the inverting input terminal and the output terminal of the first comparator U2, the first terminal of the ninth resistor R9 is connected with the output terminal of the first comparator U2, the second terminal of the ninth resistor R9 is connected with the first terminal of the control circuit 203, and the tenth resistor R10 and the eighth capacitor C8 are respectively connected between the second terminal of the ninth resistor R9 and the negative electrode line.
It should be noted that, the seventh capacitor C7 and the eighth resistor R8 are used for filtering out high-frequency interference, so as to prevent the feedback signal transmitted from the output terminal of the first comparator U2 to the inverting input terminal from being interfered by the high-frequency signal. The eighth capacitor C8, the ninth resistor R9, and the tenth resistor R10 together realize a filtering function, and are configured to filter the signal output by the first comparator U2 to obtain a signal detection result, and output the signal detection result to the first end of the control circuit 203.
The first comparator U2 may compare the voltage value input to the non-inverting input terminal with the reference voltage input to the inverting input terminal, and when the voltage value of the non-inverting input terminal is greater than the reference voltage, the first comparator U2 outputs a high-level signal for indicating that the power signal is abnormal; when the voltage value of the non-inverting input terminal is smaller than or equal to the reference voltage, the first comparator U2 outputs a low-level signal for indicating that the power supply signal is normal.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a third power output control branch 20 according to an embodiment of the present application. As shown in fig. 5, the control circuit 203 may include a first switching unit 2030, a second comparing unit 2031, and a second switching unit 2032.
Specifically, a first end of the first switching unit 2030 is connected to a second end of the signal detection circuit 202, a second end of the first switching unit 2030 is connected to a first input end of the second comparison unit 2031, an output end of the second comparison unit 2031 is connected to a first end of the second switching unit 2032, a second input end of the second comparison unit 2031 is connected to the first power supply end Vcc1, and a second end of the second switching unit 2032 is connected to the switching circuit 204.
The first switch unit 2030 is configured to output a first voltage value to a first input terminal of the second comparison unit 2031 when a signal detection result output by the signal detection circuit 202 is a high level signal, where the first voltage value may be less than or equal to 0.6V.
The second comparing unit 2031 is configured to perform voltage comparison according to the first voltage value and a second voltage value input to the second input terminal of the second comparing unit by the first power supply terminal Vcc1, and output a turn-on signal to the second switching unit 2032 when the second voltage value is greater than the first voltage value. And outputting an off signal to the second switching unit 2032 when the second voltage value is less than or equal to the first voltage value. The on signal may be a high level signal, and the off signal may be a low level signal.
The second switching unit 2032 is configured to output an off control signal to the switching circuit 204 according to the on signal. For example, the second switching unit 2032 outputs a low-level off control signal to the switching circuit 204 upon receiving a high-level signal, so that the switching circuit 204 disconnects the input circuit 200 and the output circuit 201 according to the off control signal. For another example, the second switching unit 2032 outputs a high-level conduction control signal to the switching circuit 204 when receiving a low-level signal, so that the switching circuit 204 turns on the connection between the input circuit 200 and the output circuit 201 according to the conduction control signal.
In the above embodiment, by providing the first switching unit 2030, the second comparing unit 2031, and the second switching unit 2032 in the control circuit 203, it is possible to realize control of on and off of the switching circuit according to the signal detection result output by the signal detection circuit 202.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a fourth power output control branch 20 according to an embodiment of the present application. As shown in fig. 6, the first switching unit 2030 may include a first switching tube T1, and the second comparing unit 2031 may include a second comparator U3, a first diode D1, an eleventh resistor R11, a twelfth resistor R12, a ninth capacitor C9, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15. The second switching unit 2032 includes a second switching transistor T2 and a sixteenth resistor R16.
The first end of the first switching tube T1 is connected to the second end of the signal detection circuit 202, the second end of the first switching tube T1 is connected to the second power source end Vcc2 and the cathode of the first diode D1, and the third end of the first switching tube T1 is connected to the negative line. The anode of the first diode D1 is connected to the inverting input of the second comparator U3. The voltage value of the second power supply terminal Vcc2 may be 10V, but may be any other voltage value, which is not limited in the present application.
By way of example, the first switching transistor T1 may include, but is not limited to, a transistor, a field-effect transistor (MOSFET), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), a relay, an optocoupler, and the like. For example, in the embodiment of the present application, the first switching tube T1 may be an NPN transistor, wherein a base electrode of the first switching tube T1 is connected to the second end of the signal detection circuit 202, a collector electrode of the first switching tube T1 is connected to the second power supply end Vcc2 and a cathode electrode of the first diode D1, and an emitter electrode of the first switching tube T1 is connected to the negative electrode line.
As shown in fig. 6, a first end of the eleventh resistor R11 is connected to the first power supply terminal Vcc1, a second end of the eleventh resistor R11 is connected to the inverting input terminal of the second comparator U3, a first end of the twelfth resistor R12 is connected to the first power supply terminal Vcc1, and a second end of the twelfth resistor R12 is connected to the non-inverting input terminal of the second comparator U3. The ninth capacitor C9 is connected between the inverting input terminal and the negative line of the second comparator U3, the thirteenth resistor R13 is connected between the non-inverting input terminal and the negative line of the second comparator U3, and the fourteenth resistor R14 is connected between the non-inverting input terminal and the output terminal of the second comparator U3. The first end of the fifteenth resistor R15 is connected to the output terminal of the second comparator U3, and the second end of the fifteenth resistor R15 is connected to the first end of the second switching tube T2.
It should be noted that, when the first switching tube T1 is an NPN triode, if the second end of the signal detection circuit outputs a high level signal, the first switching tube T1 is turned on, so that the voltage of the inverting input end of the second comparator U3 is pulled down, so that the voltage of the inverting input end of the second comparator U3 is smaller than the voltage of the non-inverting input end of the second comparator U3, and at this time, the output end of the second comparator U3 outputs a high level signal to the second switching unit 2032, so that the second switching unit 2032 is turned on. Since the inverting input terminal of the second comparator U3 is connected to the ninth capacitor C9, and the ninth capacitor C9 may be charged through the first power supply terminal Vcc1, the voltage across the ninth capacitor C9 (i.e., the voltage of the inverting input terminal of the second comparator U3) rises, and thus when the voltage of the inverting input terminal of the second comparator U3 is greater than or equal to the voltage of the non-inverting input terminal of the second comparator U3, the output terminal of the second comparator U3 outputs a low level signal to the second switching unit 2032, so that the second switching unit 2032 is turned off.
Wherein the on time or the off time of the second switching unit 2032 may be controlled by a voltage division ratio between the twelve resistors R12 and the thirteenth resistor R13. It will be appreciated that when the divided voltage ratio is small, that is, the higher the voltage across the thirteenth resistor R13, the ninth capacitor C9 is charged such that the longer it takes for the voltage at the inverting input terminal of the second comparator U3 to be greater than or equal to the voltage at the non-inverting input terminal of the second comparator U3, the longer the on time of the second switching unit 2032 is, and the shorter the off time is. When the voltage dividing ratio is large, the lower the voltage across the thirteenth resistor R13, the ninth capacitor C9 is charged such that the shorter the time taken for the voltage of the inverting input terminal of the second comparator U3 to be greater than or equal to the voltage of the non-inverting input terminal of the second comparator U3, the shorter the on time of the second switching unit 2032, and the longer the off time.
The first diode D1 is used to prevent current from flowing backward, for example, the current at the second end of the first switching tube T1 may be prevented from flowing backward to the inverting input terminal of the second comparator U3. The eleventh resistor R11 is used for voltage division. The fourteenth resistor R14 is a return difference resistor for raising or lowering the reference to form a return difference when the voltage at the output terminal of the second comparator U3 is too high or too low.
The second end of the second switching tube T2 is connected to the switching circuit 204, the third end of the second switching tube T2 is connected to the negative line, and the sixteenth resistor R16 is connected between the first end and the third end of the second switching tube T2.
The fifteenth resistor R15 and the sixteenth resistor R16 are used to increase the switching voltage of the second switching transistor T2, and prevent the malfunction of the second switching transistor T2.
By way of example, the second switching transistor T2 may include, but is not limited to, a transistor, a field effect transistor, an insulated gate bipolar transistor, a relay, an optocoupler, and the like. For example, in the embodiment of the present application, the second switching tube T2 may be an NPN triode, wherein the first end of the second switching tube T2 is a base, the second end of the second switching tube T2 is a collector, and the third end of the second switching tube T2 is an emitter.
Illustratively, the second switching tube T2 turns on the connection between the switching circuit 204 and the ground when receiving the high level signal output from the second comparator U3; the second switching transistor T2 disconnects the switching circuit 204 from the ground upon receiving the low level signal output from the second comparator U3.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a fifth power output control branch 20 according to an embodiment of the application. As shown in fig. 7, the switching circuit 204 may include a third switching unit 2040 and a fourth switching unit 2041, the third switching unit 2040 including a third switching transistor T3, a seventeenth resistor R17, a second diode D2, a third diode D3, an eighteenth resistor R18, and a nineteenth resistor R19. The fourth switching unit 2041 includes a fourth switching tube T4, a twentieth resistor R20, and a twenty-first resistor R21.
The first end of the third switching tube T3 is connected with the second end of the second switching tube T2, and the second end of the third switching tube T3 is connected with the second power end Vcc 2. The seventeenth resistor R17 is connected between the first and second ends of the third switching tube T3. The seventeenth resistor R17 is a bias resistor, and is used for preventing the malfunction of the third switching tube T3.
The anode of the second diode D2 is connected to the first end of the third switching tube T3, the cathode of the second diode D2 is connected to the second end of the first switching tube T1, the cathode of the third diode D3 is connected to the common end between the first end of the third switching tube T3 and the anode of the second diode D2, the anode of the third diode D3 is connected to the first end of the eighteenth resistor R18, the second end of the eighteenth resistor R18 is connected to the first end of the nineteenth resistor R19, and the second end of the nineteenth resistor R19 is connected to the third end of the third switching tube T3. The second diode D2 is configured to prevent the current at the second end of the first switching tube T1 from flowing backward to the third switching tube T3, and the third diode D3 is configured to prevent the current at the first end of the third switching tube T3 from flowing backward to the fourth switching tube T4. The eighteenth resistor R18 is used for limiting the voltage of the first end of the third switching tube T3, and the nineteenth resistor R19 is used for limiting the voltage of the third end of the third switching tube T3, so as to prevent the third switching tube T3 from malfunction.
The first end of the fourth switching tube T4 is connected with the first end of the twentieth resistor R20, the second end of the twentieth resistor R20 is connected with the second end of the eighteenth resistor R18, the first end of the twenty-first resistor R21 is connected with the second end of the twentieth resistor R20, the second end of the twenty-first resistor R21 is connected with the third end of the fourth switching tube T4, and the second end and the third end of the fourth switching tube T4 are connected in series on the positive electrode line. The twenty-first resistor R20 and the twenty-first resistor R21 are used for limiting the voltage between the first end and the third end of the fourth switching tube T4, so as to prevent the fourth switching tube T4 from malfunction.
By way of example, the third switching transistor T3 may include, but is not limited to, a transistor, a field effect transistor, an insulated gate bipolar transistor, a relay, an optocoupler, and the like. For example, in the embodiment of the present application, the third switching tube T3 may be an NPN triode, wherein the first end of the third switching tube T3 is a base, the second end of the third switching tube T3 is a collector, and the third end of the third switching tube T3 is an emitter.
In some embodiments, the fourth switching tube T4 is an N-type switching tube. In the embodiment of the present application, the fourth switching tube T4 may be an N-type MOS tube. The first end of the fourth switching tube T4 is a grid electrode, the second end of the fourth switching tube T4 is a drain electrode, and the third end of the fourth switching tube T4 is a source electrode. Of course, the second end of the fourth switching tube T4 may be a source, and the third end of the fourth switching tube T4 may be a drain. It should be noted that, by configuring the third switch tube T4 as an N-type MOS tube, the general N-type MOS tube may be used to control the on/off between the input circuit 200 and the output circuit 201, so as to reduce the difficulty of purchasing and selecting.
As shown in fig. 7, when the second switching tube T2 is turned on, the voltage on the base of the third switching tube T3 is pulled down, and the third switching tube T3 is turned off because the third switching tube T3 is an NPN transistor; at this time, the gate voltage of the fourth switching tube T4 is lower than the source voltage, and the fourth switching tube T4 is also turned off, thereby disconnecting the input circuit 200 from the output circuit 201.
Referring to fig. 8, fig. 8 is a schematic diagram of a first power output control circuit according to an embodiment of the application. As shown in fig. 8, the power supply output control circuit 20 includes an input circuit 200, an output circuit 201, a signal detection circuit 202, a control circuit 203, and a switch circuit 204.
As shown in fig. 8, the input circuit 200 is connected to the power input interface 10, and is configured to receive a power signal input to the power input interface 10. It should be noted that, the power output control circuit 20 may be applied to the switching power supply 10, where the switching power supply includes a power input interface 10 and a plurality of power output interfaces 30, and the power input interface of the switching power supply 10 may be connected to the plurality of power output control circuits 20, and a second end of each power output control circuit 20 is connected to the corresponding power output interface 30.
The positive electrode interface v0+ of the input circuit 200 is connected to the positive electrode interface Vout of the output circuit 201 via a positive electrode line, the negative electrode interface V0-of the input circuit 200 is connected to the negative electrode interface GND of the output circuit 201 via a negative electrode line, and the output circuit 201 is configured to be connected to the power output interface 30 corresponding to the power output control circuit 20.
The first end of the signal detection circuit 202 is connected to the input circuit 200, and is at least used for signal sampling of the power supply signal, and detecting the power supply signal according to the sampled signal.
A first terminal of the control circuit 203 is connected to a second terminal of the signal detection circuit 202, and the control circuit 203 is configured to generate a control signal according to a signal detection result output by the signal detection circuit 202.
The switch circuit 204 is connected to the positive line, the switch circuit 204 is further connected to the second terminal of the control circuit 203, and the switch circuit 204 is configured to disconnect the input circuit 200 from the output circuit 201 when receiving the off control signal of the control circuit 203, and to turn on the connection between the input circuit 200 and the output circuit 201 when receiving the on control signal sent by the control circuit 203, so as to output the power supply signal from the output circuit 201.
The power output control circuit 20 has the same circuit configuration as the power output control branch circuit 20 in the above embodiment.
In the above power output control circuit 20, by providing the signal detection circuit 202, the control circuit 203 and the switch circuit 204 in the power output control circuit 20, the signal detection circuit 202 can sample the power signal and detect the power signal according to the sampled signal, the control circuit 203 generates the control signal according to the signal detection result output by the signal detection circuit 202, and the switch circuit 204 disconnects the input circuit 200 from the output circuit 201 when receiving the turn-off control signal of the control circuit 203, so that the connection between the input circuit 200 and the output circuit 201 can be automatically disconnected when detecting the overcurrent and the short circuit of the power signal, so that the power output control circuit 20 has an independent turn-off protection function, not only can simplify the circuit structure, but also can isolate a plurality of power output interfaces 30, and avoid affecting the normal operation of the whole switch power 100 when a certain electric device fails, thereby effectively improving the reliability of the switch power 100.
Referring to fig. 9, fig. 9 is a schematic diagram of a second power output control circuit according to an embodiment of the application. Referring to fig. 8 and 9, the input circuit 200 further includes a first capacitor C1, and the signal detection circuit 202 includes a sampling unit 2020, an amplifying unit 2021, and a first comparing unit 2022.
The specific circuit structures of the sampling unit 2020, the amplifying unit 2021 and the first comparing unit 2022 may be referred to the detailed description of fig. 4 in the above embodiment, and the specific circuit structures are not described herein again.
Referring to fig. 8 and 9, the control circuit 203 may include a first switching unit 2030, a second comparing unit 2031, and a second switching unit 2032. The specific circuit structures of the first switch unit 2030, the second comparison unit 2031, and the second switch unit 2032 may be referred to the detailed description of fig. 6 in the above embodiment, and the specific circuit structures are not described herein.
Referring to fig. 8 and 9, the switch circuit 204 may include a third switch unit 2040 and a fourth switch unit 2041, wherein specific circuit structures of the third switch unit 2040 and the fourth switch unit 2041 may be referred to the detailed description of fig. 7 in the above embodiments, and the specific circuit structures are not repeated here.
Referring to fig. 8 and 9, the output circuit 201 further includes a tenth capacitor C10, an anode of the tenth capacitor C10 is connected to the positive electrode interface Vout of the output circuit 201, a cathode of the tenth capacitor C10 is connected to the negative electrode interface GND of the output circuit 201, and the tenth capacitor C10 is configured to filter a power signal input to the output circuit 201.
In the embodiment of the present application, an example will be described in which the output current of the single output of the switching power supply 100 is greater than 5A, and how the power supply output control circuit implements the output turn-off protection.
Referring to fig. 8 and 9, when the first resistor R1 is 20 milliohms and the output current is 5A, the voltage drop across the first resistor R1 is 0.1mV, that is, the voltage collected by the signal detection circuit 202 is 0.1mV, and after 50-fold amplification by the operational amplifier U1, the pin1 voltage of the operational amplifier U1 is: 0.1×50=5v, i.e. the output voltage of the operational amplifier U1 is 5V; the output voltage is filtered by a fourth resistor R4 and a fifth capacitor C5, reaches the point B and is sent to the pin3 of the first comparator U2. If the reference voltage at pin2 pin C of the first comparator U2 is set to 5V (the reference voltage value is set according to the self-demand), when the output current output to the positive electrode interface Vout is greater than 5A, the voltage drop generated by the output current through the first resistor R1 is greater than 0.1mV; after the amplification of the operational amplifier U1, the output voltage of the operational amplifier U1 is greater than 5V, and at the moment, the output voltage is higher than the set reference voltage (5V), and the pin1 pin of the first comparator U2 outputs a high-level signal to the first switching tube T1; the first switching tube T1 is conducted according to the high-level signal, the voltage of the H point is pulled down, and the H point of the pin6 pin of the second comparator U3 is pulled down to be below 0.6V. Wherein the voltage at the point E of pin5 of the second comparator U3 may be set to control the on-time and the off-time of the second switching tube T2 with the voltage division ratio between the twelfth resistor R12 and the thirteenth resistor R13, and for example, the voltage at the point E may be set to 10V. When the voltage at the E point is higher than the voltage at the D point, pin7 of the second comparator U3 outputs a high-level signal to control the second switching tube T2 to be conducted, and after the second switching tube T2 is conducted, the base voltage of the N-type third switching tube T3 is lower than 0.1V. Since the base voltage of the triode is more than 0.7V of the emitter and is less than 0.6V of the emitter, when the base voltage of the third switching tube T3 is controlled to be less than 0.1V by the second switching tube T2, the third switching tube T3 is turned off. Since the gate voltage of the fourth switching tube T4 of the N-type MOSFET is lower than the source voltage by 5V or less, the fourth switching tube T4 is turned off, and thus when the third switching tube T3 is turned off, the gate of the fourth switching tube T4 has no voltage, and the gate voltage of the fourth switching tube T4 is turned off, so that the connection between the input circuit 200 and the output circuit 201 can be disconnected, and the output turn-off protection can be realized.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411089642.3A CN118589865B (en) | 2024-08-09 | 2024-08-09 | Power output control circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411089642.3A CN118589865B (en) | 2024-08-09 | 2024-08-09 | Power output control circuit and switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118589865A CN118589865A (en) | 2024-09-03 |
| CN118589865B true CN118589865B (en) | 2024-11-22 |
Family
ID=92533734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411089642.3A Active CN118589865B (en) | 2024-08-09 | 2024-08-09 | Power output control circuit and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118589865B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119414944A (en) * | 2024-10-21 | 2025-02-11 | 深圳市七彩虹禹贡信息技术发展有限公司 | An abnormal detection protection circuit for a multi-graphics card terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN220544692U (en) * | 2023-08-10 | 2024-02-27 | 深圳拓邦股份有限公司 | Overcurrent protection circuit structure and intelligent device |
| CN117674021A (en) * | 2022-09-01 | 2024-03-08 | 广州视源电子科技股份有限公司 | Power output protection circuit and power supply device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4586119A (en) * | 1984-04-16 | 1986-04-29 | Itt Corporation | Off-line switching mode power supply |
| CN204334330U (en) * | 2014-07-18 | 2015-05-13 | 江苏博纬新能源科技有限公司 | A kind of modularization high-voltage power supply circuit |
| CN208522642U (en) * | 2018-08-24 | 2019-02-19 | 深圳市普德新星电源技术有限公司 | The output control circuit and power-supply system of power supply |
| US11509229B2 (en) * | 2020-08-08 | 2022-11-22 | Patrick Carden | Resonant core power supply |
| CN112467864A (en) * | 2020-11-19 | 2021-03-09 | 厦门海索科技有限公司 | Modularized high-reliability emergency power supply capable of realizing fault diagnosis and service life prediction |
| CN115714356A (en) * | 2022-11-08 | 2023-02-24 | 江苏正力新能电池技术有限公司 | Short-circuit protection circuit and battery management system |
-
2024
- 2024-08-09 CN CN202411089642.3A patent/CN118589865B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117674021A (en) * | 2022-09-01 | 2024-03-08 | 广州视源电子科技股份有限公司 | Power output protection circuit and power supply device |
| CN220544692U (en) * | 2023-08-10 | 2024-02-27 | 深圳拓邦股份有限公司 | Overcurrent protection circuit structure and intelligent device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118589865A (en) | 2024-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111327018B (en) | Overcurrent and overvoltage self-locking protection circuit and adapter | |
| CN100574031C (en) | A kind of power convertor output protection circuit | |
| CN109342973B (en) | Direct current power supply input state monitoring circuit and system | |
| CN118589865B (en) | Power output control circuit and switching power supply | |
| CN101877545A (en) | power module | |
| CN102412710B (en) | IGBT (Insulated Gate Bipolar Transistor) module driving circuit suitable for high-power inverter | |
| CN102013802B (en) | BOOST circuit with short circuit protection function | |
| CN211508593U (en) | Over-current and over-voltage self-locking protection circuit and adapter | |
| CN103379698B (en) | There is the LED constant-current drive circuit of short-circuit protection | |
| CN110784201A (en) | NMOS switch drive circuit and power supply device | |
| CN216086450U (en) | Distribution switch circuit who possesses current sampling and voltage sampling | |
| CN116094143A (en) | Power voltage detecting system | |
| CN108829170B (en) | Linear voltage stabilizing circuit with overcurrent protection | |
| CN103187710A (en) | Current-limit and over-current double current loop protection circuit | |
| CN203151079U (en) | Double-current loop protective circuit of limited current and excess current | |
| CN203870152U (en) | Current saturation detection and clamping circuit | |
| CN109599846A (en) | A kind of overcurrent protection circuit and guard method of display module | |
| CN118971564A (en) | Bidirectional current sampling circuit | |
| KR102811436B1 (en) | Fault diagnosis apparatus and method | |
| CN212695707U (en) | MOSFET surge protection circuit | |
| CN217213109U (en) | Abnormity detection circuit and intelligent electric energy meter | |
| CN104037722A (en) | Safety circuit based on load over-current fault | |
| CN205583660U (en) | Output overcurrent protection circuit of frequency converter | |
| CN101577492B (en) | Power supply circuit | |
| CN220067213U (en) | Power switch control circuit for direct-current charger and direct-current charger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |