CN221574863U - Short-circuit protection circuit and switching power supply - Google Patents
Short-circuit protection circuit and switching power supply Download PDFInfo
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- CN221574863U CN221574863U CN202323264771.5U CN202323264771U CN221574863U CN 221574863 U CN221574863 U CN 221574863U CN 202323264771 U CN202323264771 U CN 202323264771U CN 221574863 U CN221574863 U CN 221574863U
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Abstract
The application provides a short-circuit protection circuit and a switching power supply, and relates to the technical field of electronic circuits. The first end of the control switch in the short-circuit protection circuit is connected with the first output end of the power supply circuit and the input end of the current transmission module, and the second end of the control switch is connected with the input end of the power supply object and the output end of the current transmission module; the detection end of the short circuit detection module is connected with the input end of the power supply object, and the control end of the short circuit detection module is connected with the control end of the control switch. According to the embodiment of the application, the short circuit condition of the power supply circuit is detected through the short circuit detection module, and when the short circuit is detected, the control switch is controlled to be disconnected, so that the control switch is prevented from being damaged in the short circuit process, the possibility of damage of the control switch is reduced, and the short circuit protection of the control switch is realized.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a short-circuit protection circuit and a switching power supply.
Background
The switching power supply is widely applied to various devices due to the advantages of small size, light weight, high conversion efficiency, stable and reliable performance and the like, and when the switching power supply works normally, a control switch is arranged in the switching power supply to realize the rapid and stable switching of the state of the switching power supply, and the switching of the state is realized through the on-off of the control switch. However, the control switch has short-circuit tolerance time and is difficult to bear large current, and if an output short circuit occurs, the control switch is easy to overheat or damage due to the fact that the output short circuit generates very large current, so that the control switch of the switching power supply needs to be short-circuit protected.
Disclosure of utility model
The embodiment of the application provides a short-circuit protection circuit and a switching power supply, which can solve the problem that a control switch is easy to damage when short circuit or large current occurs. In order to achieve the object, embodiments of the present application provide the following solutions.
According to an aspect of an embodiment of the present application, there is provided a short-circuit protection circuit including: the power supply device comprises a control switch, a current transmission module and a short circuit detection module, wherein a first end of the control switch is connected with a first output end of a power supply circuit and an input end of the current transmission module, and a second end of the control switch is connected with an input end of a power supply object and an output end of the current transmission module;
The detection end of the short circuit detection module is connected with the input end of the power supply object, and the control end of the short circuit detection module is connected with the control end of the control switch.
In one possible implementation manner, the short circuit detection module comprises a first zener diode, a first resistor and a first triode;
The cathode of the first voltage stabilizing diode is connected with the input end of the power supply object, and the anode of the first voltage stabilizing diode is connected with the base electrode of the first triode and the first end of the first resistor;
the second end of the first resistor is grounded;
and the emitter electrode of the first triode is grounded, and the collector electrode is connected with the control end of the control switch.
In one possible implementation manner, the current transmission module includes a second resistor, the short circuit detection module further includes a third resistor and a fourth resistor, a first end of the third resistor is connected with a first end of the second resistor and a first end of the control switch, a second end of the third resistor is connected with a control end of the control switch, a second end of the second resistor is connected with a cathode of the first zener diode, a first end of the fourth resistor is connected with an anode of the first zener diode, and a second end of the fourth resistor is connected with a base of the first triode.
According to one aspect of the application, a switching power supply is provided, the switching power supply comprises a power supply circuit and the short-circuit protection circuit, the input end of the power supply circuit is connected with a direct-current power supply, and the output end of the power supply circuit is connected with the short-circuit protection circuit.
In one possible implementation manner, the power supply circuit includes a constant current driving module, where the constant current driving module includes a constant current driving chip, a first inductor, a second zener diode, a third zener diode, a first capacitor, a second capacitor, and a fifth resistor;
The positive electrode of the output end of the direct current power supply is connected with the voltage end, the enabling end and the first end of the first inductor of the constant current driving chip;
The second end of the first inductor is connected with the anode of the second zener diode, and the cathode of the second zener diode is connected with the cathode of the third zener diode and the first end of the control switch;
the anode of the third zener diode is connected with the feedback end of the constant current driving chip;
The first end of the fifth resistor is connected with the current-limiting detection end of the constant-current driving chip, and the second end of the fifth resistor is connected with the grounding end of the constant-current driving chip and grounded;
the second end of the first capacitor is connected with the second end of the second capacitor and grounded;
the first end of the first capacitor is connected with the turn-off time setting end of the constant current driving chip, and the first end of the second capacitor is connected with the frequency compensation end of the constant current driving chip.
In one possible implementation manner, the constant current driving module further comprises a sub-control module, wherein the sub-control module comprises a sixth resistor, a second triode, a seventh resistor, a first diode and a third capacitor;
The first end of the sixth resistor is connected with the voltage end of the constant current driving chip, the second end of the sixth resistor is connected with the enabling end of the constant current driving chip and the collector electrode of the second triode, the grid electrode of the second triode is connected with the cathode of the first diode and the first end of the third capacitor, the emitting electrode of the second triode is grounded, the second end of the third capacitor is grounded, the anode of the first diode is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with a control signal.
In one possible implementation manner, the sub-control module further includes an eighth resistor and a ninth resistor, a first end of the eighth resistor is connected with the cathode of the first diode, a second end of the eighth resistor is connected with the base electrode of the second triode and the first end of the ninth resistor, and a second end of the ninth resistor is grounded and connected with the output terminal negative electrode of the direct current power supply.
In one possible implementation manner, the constant current driving module further includes a fourth capacitor and a fifth capacitor, a first end of the fourth capacitor is connected with an anode of the output end of the direct current power supply, a second end of the fourth capacitor is connected with a cathode of the output end of the direct current power supply and a first end of the fifth capacitor, and a second end of the fifth capacitor is connected with a voltage end of the constant current driving chip.
In one possible implementation manner, the constant current driving module further includes a twelfth resistor and a thirteenth resistor, a first end of the twelfth resistor is connected to the first end of the third resistor, a second end of the twelfth resistor is connected to the feedback end of the constant current driving chip and the first end of the thirteenth resistor, and a second end of the thirteenth resistor is grounded.
In one possible implementation manner, the switching power supply further includes a filtering module, where the filtering module includes a magnetic bead, a sixth capacitor, and a tenth resistor, a second end of the magnetic bead is connected to an anode of the second zener diode, a first end of the magnetic bead is connected to a first end of the sixth capacitor, a second end of the sixth capacitor is connected to a first end of the tenth resistor, and a second end of the tenth resistor is connected to a cathode of the second zener diode.
The technical scheme provided by the embodiment of the application has the beneficial effects that:
The application provides a short-circuit protection circuit, which comprises a control switch, a current transmission module and a short-circuit detection module, wherein a first end of the control switch is connected with a first output end of a power supply circuit and an input end of the current transmission module, a second end of the control switch is connected with an input end of a power supply object and an output end of the current transmission module, a detection end of the short-circuit detection module is connected with an input end of the power supply object, and a control end of the short-circuit detection module is connected with a control end of the control switch. According to the embodiment of the application, the short circuit condition of the power supply circuit is detected through the short circuit detection module, and when the short circuit is detected, the control switch is controlled to be disconnected, so that the control switch is prevented from being damaged in the short circuit process, the possibility of damage of the control switch is reduced, and the short circuit protection of the control switch is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following description will simply refer to the drawings that are required to be used in the description of the embodiments of the present application.
Fig. 1 is a block diagram of a short-circuit protection circuit according to an embodiment of the present application;
Fig. 2 is a circuit diagram of a short-circuit protection circuit according to an embodiment of the present application;
FIG. 3 is a block diagram of a switching power supply according to an embodiment of the present application;
fig. 4 is a partial circuit diagram of a switching power supply according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described below with reference to the drawings in the present application. It should be understood that the embodiments described below with reference to the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and the technical solutions of the embodiments of the present application are not limited.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and "comprising," when used in this specification, specify the presence of stated features, information, data, steps, operations, elements, and/or components, but do not preclude the presence or addition of other features, information, data, steps, operations, elements, components, and/or groups thereof, all of which may be included in the present specification. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein indicates at least one of the items defined by the term, e.g. "a and/or B" indicates implementation as "a", or as "a and B".
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the following detailed description of the embodiments of the present utility model will be given with reference to the accompanying drawings.
The technical solutions of the embodiments of the present utility model and technical effects produced by the technical solutions of the present utility model are described below by describing several exemplary embodiments. It should be noted that the following embodiments may be referred to, or combined with each other, and the description will not be repeated for the same terms, similar features, similar implementation steps, and the like in different embodiments.
The application provides a short-circuit protection circuit and a switching power supply, which aim to solve at least one technical problem in the prior art.
As shown in fig. 1 and 2, the embodiment of the application provides a short-circuit protection circuit, which can be applied to a charger, a mobile phone, a refrigerator, a television and other devices using a switching power supply.
Optionally, as shown in fig. 1, the short-circuit protection circuit includes: the power supply device comprises a control switch, a current transmission module and a short circuit detection module, wherein a first end of the control switch is connected with a first output end of a power supply circuit and an input end of the current transmission module, and a second end of the control switch is connected with an input end of a power supply object and an output end of the current transmission module; the detection end of the short circuit detection module is connected with the input end of the power supply object, and the control end of the short circuit detection module is connected with the control end of the control switch.
Alternatively, the control switch may be a field effect transistor, a triode, a thyristor, or other device having a switching function. The short circuit detection module detects the state of the power supply object or the voltage transmitted to the power supply object, and after detecting the short circuit or the overlarge current, the short circuit detection module sends a trigger signal to the control switch, the trigger signal triggers the control switch to be disconnected, and the current is transmitted to the power supply object through the current module.
Alternatively, the power supply object may be an LED, a camera, a sound, or other devices that operate using direct current.
Optionally, the short circuit detection module includes a first zener diode, a first resistor, and a first triode; the cathode of the first voltage stabilizing diode is connected with the input end of the power supply object, and the anode is connected with the base electrode of the first triode and the first end of the first resistor; the second end of the first resistor is grounded; the emitter of the first triode is grounded, and the collector is connected with the control end of the control switch.
In one embodiment, as shown in fig. 2, the first zener diode may be a diode D1 with an operating voltage of 6.2V. The first transistor may be a transistor Q1, and the first resistor may be a resistor R1.
Optionally, in order to reduce negative effects of a short circuit or excessive current, the current transfer module includes a second resistor through which the current transferred to the power supply object is reduced.
The short circuit detection module further comprises a third resistor and a fourth resistor, wherein the first end of the third resistor is connected with the first end of the second resistor and the first end of the control switch, the second end of the third resistor is connected with the control end of the control switch, the second end of the second resistor is connected with the cathode of the first zener diode, the first end of the fourth resistor is connected with the anode of the first zener diode, and the second end of the fourth resistor is connected with the base electrode of the first triode.
In one embodiment, as shown in fig. 2, the second resistor may be resistor R2, the third resistor may be resistor R3, and the fourth resistor may be resistor R4. Specifically, the control switch is a field effect transistor Q2, its model is RF9Z14, and it is a P-channel field effect transistor. When the short-circuit protection circuit works, the field effect transistor Q2 is conducted, current reaches the source electrode of the Q2, voltage reaches the grid electrode of the field effect transistor Q2 through the resistor R3, the grid electrode is in a high level, the source electrode and the drain electrode of the field effect transistor Q2 are cut off, and the short-circuit protection circuit is in a non-conducting state, and a power supply object cannot receive current and does not work. Similarly, the voltage reaches the cathode of the diode D1 through the second resistor, which is greater than the operating voltage of the diode D1, the transistor Q1 is turned on, and the gate voltage of the field effect transistor Q2 is pulled down. So that the field effect transistor Q2 is normally turned on and the power supply object receives current. When the power supply object is short-circuited, the drain voltage of the field effect transistor Q2 decreases, the diode D1 is turned off, and the transistor Q1 is turned off. The gate voltage of the field effect transistor Q2 is at a high level, the field effect transistor Q2 is in an off state, no large current flows through the field effect transistor Q2, and the short circuit of the power supply object does not cause the high temperature or damage of the field effect transistor Q2.
The short-circuit protection circuit detects the short-circuit condition of the power supply circuit through the short-circuit detection module, and controls the control switch to be disconnected when the short-circuit is detected, so that the control switch is prevented from being damaged during short-circuit, the possibility of damage of the control switch is reduced, and the short-circuit protection of the control switch is realized.
According to an aspect of the present application, as shown in fig. 3 and 4, the switching power supply of the present application includes a power supply circuit and a short-circuit protection circuit, wherein an input end of the power supply circuit is connected to a dc power supply, and an output end of the power supply circuit is connected to the short-circuit protection circuit. The current transmitted by the power supply circuit is output to a power supply object through the short-circuit protection circuit. When the output is short-circuited or the output current is excessive, the short-circuit protection circuit protects the circuit in the switching power supply and prevents the circuit and the power supply object from being damaged by the large current generated by the sudden cut-off of the circuit.
Alternatively, a plurality of control switches may be provided in the switching power supply, and a corresponding short-circuit protection circuit may be provided for each control switch. The plurality of control switches may share one short-circuit protection circuit.
Optionally, the method comprises: the power supply device comprises a control switch, a current transmission module and a short circuit detection module, wherein a first end of the control switch is connected with a first output end of a power supply circuit and an input end of the current transmission module, and a second end of the control switch is connected with an input end of a power supply object and an output end of the current transmission module; the detection end of the short circuit detection module is connected with the input end of the power supply object, and the control end of the short circuit detection module is connected with the control end of the control switch.
Optionally, the short circuit detection module includes a first zener diode, a first resistor, and a first triode; the cathode of the first voltage stabilizing diode is connected with the input end of the power supply object, and the anode is connected with the base electrode of the first triode and the first end of the first resistor; the second end of the first resistor is grounded; the emitter of the first triode is grounded, and the collector is connected with the control end of the control switch.
Optionally, the current transmission module includes a second resistor, the short circuit detection module further includes a third resistor and a fourth resistor, a first end of the third resistor is connected with a first end of the second resistor and a first end of the control switch, a second end of the third resistor is connected with a control end of the control switch, a second end of the second resistor is connected with a cathode of the first zener diode, a first end of the fourth resistor is connected with an anode of the first zener diode, and a second end of the fourth resistor is connected with a base of the first triode.
Optionally, the power supply circuit comprises a constant current driving module, wherein the constant current driving module comprises a constant current driving chip, a first inductor, a second zener diode, a third zener diode, a first capacitor, a second capacitor and a fifth resistor; the positive electrode of the output end of the direct current power supply is connected with the voltage end, the enabling end and the first end of the first inductor of the constant current driving chip; the second end of the first inductor is connected with the anode of a second zener diode, and the cathode of the second zener diode is connected with the cathode of a third zener diode and the first end of the control switch; the anode of the third voltage stabilizing diode is connected with the feedback end of the constant current driving chip; the first end of the fifth resistor is connected with the current-limiting detection end of the constant-current driving chip, and the second end of the fifth resistor is connected with the grounding end of the constant-current driving chip and grounded; the second end of the first capacitor is connected with the second end of the second capacitor and grounded; the first end of the first capacitor is connected with the turn-off time setting end of the constant current driving chip, and the first end of the second capacitor is connected with the frequency compensation end of the constant current driving chip.
In one embodiment, as shown in fig. 4, the constant current driving chip may be a chip U2, which is of the model OC3002, the first inductor is an inductor L1, the second zener diode is a diode D2, the third zener diode is a diode D3, the first capacitor is a capacitor C1, the second capacitor is a capacitor C2, and the fifth resistor is a resistor D5. The operating frequency of the switching power supply may be 150KHZ. The current limiting detection end of the chip U2 is a pin CS, the grounding end is a pin VSS, and the feedback end is a pin FB. The second end of the inductor L1 is also connected to the SW pin of the chip U2.
Optionally, in order to effectively control the operation of the constant current driving chip and adjust the operating frequency of the constant current driving chip, the constant current driving module further comprises a sub-control module, and the sub-control module comprises a sixth resistor, a second triode, a seventh resistor, a first diode and a third capacitor; the first end of the sixth resistor is connected with the voltage end of the constant current driving chip, the second end of the sixth resistor is connected with the enabling end of the constant current driving chip and the collector electrode of the second triode, the grid electrode of the second triode is connected with the cathode of the first diode and the first end of the third capacitor, the emitter electrode of the second triode is grounded, the second end of the third capacitor is grounded, the anode electrode of the first diode is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with a control signal.
Optionally, the sub-control module further includes an eighth resistor and a ninth resistor, a first end of the eighth resistor is connected with the cathode of the first diode, a second end of the eighth resistor is connected with the base electrode of the second triode and a first end of the ninth resistor, and a second end of the ninth resistor is grounded and connected with the negative electrode of the output end of the direct current power supply.
In one embodiment, as shown in fig. 4, the sixth resistor may be a resistor R6, the second transistor may be a transistor Q3, the seventh resistor may be a resistor R7, the first diode may be a diode D1, and the third capacitor may be a capacitor C3. The eighth resistor may be resistor R8 and the ninth resistor may be resistor R9. Specifically, the model of the triode Q3 may be 2N3904, the enabling end of the chip U2 is a Dim pin, the Dim pin is connected with the collector of the triode Q3, and the emitter of the triode Q3 is grounded.
Optionally, the constant current driving module further includes a fourth capacitor and a fifth capacitor, a first end of the fourth capacitor is connected with an anode of the output end of the direct current power supply, a second end of the fourth capacitor is connected with a cathode of the output end of the direct current power supply and a first end of the fifth capacitor, and a second end of the fifth capacitor is connected with a voltage end of the constant current driving chip. And filtering the interference signals of the direct current power supply through the fourth capacitor and the fifth capacitor.
In one embodiment, the fourth capacitance may be capacitance C4 and the fifth capacitance may be capacitance C5. Specifically, the capacitance of the capacitor C4 is 100 μf, the operating voltage thereof is 50v, and the model of the capacitor C5 may be 104.
Optionally, the constant current driving module further includes a sub-voltage dividing module, the sub-voltage dividing module includes a twelfth resistor and a thirteenth resistor, a first end of the twelfth resistor is connected with a first end of the third resistor, a second end of the twelfth resistor is connected with a feedback end of the constant current driving chip and a first end of the thirteenth resistor, and a second end of the thirteenth resistor is grounded.
In one embodiment, as shown in fig. 4, the twelfth resistor may be a resistor R12, the thirteenth resistor may be a resistor R13, and the first end of the resistor R12 is connected to the resistor R3, and the second end is connected to the anode of the diode D3 and the FB pin of the chip U2.
Optionally, in order to further filter the interference signal, the switching power supply further includes a filtering module, the filtering module includes a magnetic bead, a sixth capacitor, a tenth resistor, the second end of the magnetic bead is connected with the anode of the second zener diode, the first end of the magnetic bead is connected with the first end of the sixth capacitor, the second end of the sixth capacitor is connected with the first end of the tenth resistor, and the second end of the tenth resistor is connected with the cathode of the second zener diode.
In one embodiment, as shown in fig. 4, the magnetic bead may be a magnetic bead B1, the sixth capacitor may be a capacitor C6, the tenth resistor may be a resistor R10, and the second end of the resistor R10 is connected to the cathode of the diode D2 and the cathode of the diode D3. The switching power supply may further include a capacitor C7 and a resistor R11, where a first end of the capacitor C7 is connected to the cathode of the diode D2 and the source of the field effect transistor Q2, a second end of the capacitor C7 is connected to the cathode of the diode D5 and the first end of the resistor R11, and a second end of the resistor R11 is connected to the anode of the diode D5 and the second end of the resistor R13.
The switching power supply of the application has the following advantages:
1. whether the current switching power supply works normally or is abnormal (such as short circuit) can be automatically detected through the short circuit protection circuit.
2. Short circuit detection requires few components and has low circuit cost.
3. The response speed is high, and the short circuit condition can be detected rapidly.
4. Before short circuit, the components except the control switch in the short circuit detection circuit do not need to work, and the power consumption is low.
The terms "first," "second," "third," "fourth," "1," "2," and the like in the description and in the claims and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
It should be understood that, although various operation steps are indicated by arrows in the flowcharts of the embodiments of the present application, the order in which these steps are implemented is not limited to the order indicated by the arrows. In some implementations of embodiments of the application, the implementation steps in the flowcharts may be performed in other orders as desired, unless explicitly stated herein. Furthermore, some or all of the steps in the flowcharts may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or phases may be performed at the same time, or each of these sub-steps or phases may be performed at different times, respectively. In the case of different execution time, the execution sequence of the sub-steps or stages can be flexibly configured according to the requirement, which is not limited by the embodiment of the present application.
The foregoing is merely an optional implementation manner of some of the implementation scenarios of the present application, and it should be noted that, for those skilled in the art, other similar implementation manners based on the technical ideas of the present application are adopted without departing from the technical ideas of the scheme of the present application, and the implementation manner is also within the protection scope of the embodiments of the present application.
Claims (10)
1. A short-circuit protection circuit, comprising: the power supply device comprises a control switch, a current transmission module and a short circuit detection module, wherein a first end of the control switch is connected with a first output end of a power supply circuit and an input end of the current transmission module, and a second end of the control switch is connected with an input end of a power supply object and an output end of the current transmission module;
The detection end of the short circuit detection module is connected with the input end of the power supply object, and the control end of the short circuit detection module is connected with the control end of the control switch.
2. The short-circuit protection circuit of claim 1, wherein the short-circuit detection module comprises a first zener diode, a first resistor, and a first transistor;
The cathode of the first voltage stabilizing diode is connected with the input end of the power supply object, and the anode of the first voltage stabilizing diode is connected with the base electrode of the first triode and the first end of the first resistor;
the second end of the first resistor is grounded;
and the emitter electrode of the first triode is grounded, and the collector electrode is connected with the control end of the control switch.
3. The short-circuit protection circuit according to claim 2, wherein the current transmission module comprises a second resistor, the short-circuit detection module further comprises a third resistor and a fourth resistor, a first end of the third resistor is connected with a first end of the second resistor and a first end of the control switch, a second end of the third resistor is connected with a control end of the control switch, a second end of the second resistor is connected with a cathode of the first zener diode, a first end of the fourth resistor is connected with an anode of the first zener diode, and a second end of the fourth resistor is connected with a base of the first triode.
4. A switching power supply, characterized in that the switching power supply comprises a power supply circuit and a short-circuit protection circuit according to any one of claims 1-3, wherein the input end of the power supply circuit is connected to a direct current power supply, and the output end of the power supply circuit is connected to the short-circuit protection circuit.
5. The switching power supply of claim 4 wherein the power supply circuit comprises a constant current drive module comprising a constant current drive chip, a first inductor, a second zener diode, a third zener diode, a first capacitor, a second capacitor, and a fifth resistor;
The positive electrode of the output end of the direct current power supply is connected with the voltage end, the enabling end and the first end of the first inductor of the constant current driving chip;
The second end of the first inductor is connected with the anode of the second zener diode, and the cathode of the second zener diode is connected with the cathode of the third zener diode and the first end of the control switch;
the anode of the third zener diode is connected with the feedback end of the constant current driving chip;
The first end of the fifth resistor is connected with the current-limiting detection end of the constant-current driving chip, and the second end of the fifth resistor is connected with the grounding end of the constant-current driving chip and grounded;
the second end of the first capacitor is connected with the second end of the second capacitor and grounded;
the first end of the first capacitor is connected with the turn-off time setting end of the constant current driving chip, and the first end of the second capacitor is connected with the frequency compensation end of the constant current driving chip.
6. The switching power supply of claim 5, wherein the constant current driving module further comprises a sub-control module, the sub-control module comprising a sixth resistor, a second triode, a seventh resistor, a first diode, a third capacitor;
The first end of the sixth resistor is connected with the voltage end of the constant current driving chip, the second end of the sixth resistor is connected with the enabling end of the constant current driving chip and the collector electrode of the second triode, the grid electrode of the second triode is connected with the cathode of the first diode and the first end of the third capacitor, the emitting electrode of the second triode is grounded, the second end of the third capacitor is grounded, the anode of the first diode is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with a control signal.
7. The switching power supply according to claim 6, wherein the sub-control module further comprises an eighth resistor and a ninth resistor, a first end of the eighth resistor is connected to the cathode of the first diode, a second end of the eighth resistor is connected to the base of the second triode and a first end of the ninth resistor, and a second end of the ninth resistor is grounded and connected to the negative electrode of the output terminal of the dc power supply.
8. The switching power supply according to claim 7, wherein the constant current driving module further comprises a fourth capacitor and a fifth capacitor, a first end of the fourth capacitor is connected to an anode of the output terminal of the direct current power supply, a second end of the fourth capacitor is connected to a cathode of the output terminal of the direct current power supply and a first end of the fifth capacitor, and a second end of the fifth capacitor is connected to a voltage end of the constant current driving chip.
9. The switching power supply according to claim 5, wherein the constant current driving module further comprises a twelfth resistor and a thirteenth resistor, a first end of the twelfth resistor is connected to the first end of the third resistor, a second end of the twelfth resistor is connected to the feedback end of the constant current driving chip and the first end of the thirteenth resistor, and a second end of the thirteenth resistor is grounded.
10. The switching power supply of claim 5 further comprising a filter module comprising a magnetic bead, a sixth capacitor, a tenth resistor, the second end of the magnetic bead being connected to the anode of the second zener diode, the first end of the magnetic bead being connected to the first end of the sixth capacitor, the second end of the sixth capacitor being connected to the first end of the tenth resistor, the second end of the tenth resistor being connected to the cathode of the second zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323264771.5U CN221574863U (en) | 2023-11-30 | 2023-11-30 | Short-circuit protection circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323264771.5U CN221574863U (en) | 2023-11-30 | 2023-11-30 | Short-circuit protection circuit and switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN221574863U true CN221574863U (en) | 2024-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323264771.5U Active CN221574863U (en) | 2023-11-30 | 2023-11-30 | Short-circuit protection circuit and switching power supply |
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| Country | Link |
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| CN (1) | CN221574863U (en) |
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