CN219019082U - Short-circuit protection circuit - Google Patents
Short-circuit protection circuit Download PDFInfo
- Publication number
- CN219019082U CN219019082U CN202223306770.8U CN202223306770U CN219019082U CN 219019082 U CN219019082 U CN 219019082U CN 202223306770 U CN202223306770 U CN 202223306770U CN 219019082 U CN219019082 U CN 219019082U
- Authority
- CN
- China
- Prior art keywords
- resistor
- triode
- circuit
- circuit module
- short
- 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
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a short-circuit protection circuit which is used for protecting a dimming control circuit of an LED lamp, wherein the circuit comprises a power supply circuit module, a silicon controlled rectifier protection circuit module and a dimming control circuit module; one end of the power supply circuit module is connected with one end of the silicon controlled rectifier protection circuit module, the other end of the silicon controlled rectifier protection circuit module is connected with one end of the dimming control circuit, and the other end of the dimming control circuit is connected with the LED lamp; the power supply circuit module is used for supplying power to the silicon controlled rectifier protection circuit module; the silicon controlled rectifier protection circuit module is used for providing short-circuit protection for the dimming control circuit module. The thyristor and the sampling resistor arranged in the short-circuit protection circuit are adjusted in real time according to the voltage of the LED lamp and correspondingly adjusted in an adaptive manner, and the short-circuit is locked to avoid the control chip from restarting repeatedly.
Description
Technical Field
The utility model relates to the technical field of control circuits, in particular to a short-circuit protection circuit.
Background
Along with the continuous complicating of the functional requirement of LED lamps and lanterns product, cost requirement sexual valence relative altitude, the reliability of product is an important index.
The short-circuit protection of most constant-voltage dimming products in the current market is too complex to control cost well, the short-circuit protection is in a hiccup mode, and at the moment, the control chip is always in a repeated restarting state, and the power supply can be damaged when the control chip is in the short-circuit protection state for a long time.
Disclosure of Invention
The embodiment of the utility model provides a short-circuit protection circuit, which aims to solve the problem that a control chip is repeatedly restarted in the protection process of the short-circuit protection circuit in the prior art.
The embodiment of the utility model discloses a short-circuit protection circuit which is used for protecting a dimming control circuit of an LED lamp, wherein the circuit comprises a power supply circuit module, a silicon controlled rectifier protection circuit module and a dimming control circuit module; one end of the power supply circuit module is connected with one end of the silicon controlled rectifier protection circuit module, the other end of the silicon controlled rectifier protection circuit module is connected with one end of the dimming control circuit, and the other end of the dimming control circuit is connected with the LED lamp; the power supply circuit module is used for supplying power to the silicon controlled rectifier protection circuit module; the silicon controlled rectifier protection circuit module is used for providing short-circuit protection for the dimming control circuit module.
Further, the thyristor protection circuit module comprises a second diode, a third diode, a second resistor, a third capacitor, a thyristor and a sampling resistor; the anode of the second diode is connected with the dimming control circuit module, and the cathode of the second diode is connected with the anode of the thyristor; the anode of the third diode is connected with the dimming control circuit module, and the cathode of the third diode is connected with the anode of the thyristor; one end of the second resistor is connected with the power supply circuit module, and the other end of the second resistor is connected with the anode of the thyristor; the cathode of the thyristor is grounded, the end electrode of the thyristor is connected with one end of the third capacitor, and the end electrode of the thyristor is also connected with one end of the third resistor; the other end of the third resistor is connected with one end of the sampling resistor, and the other end of the third resistor is also connected with the dimming control circuit module; the other end of the third capacitor is grounded; the other end of the sampling resistor is grounded.
Further, the dimming control circuit module comprises a first dimming control unit and a second dimming control unit, wherein the first dimming control unit is connected with the positive electrode of the second diode, and the second dimming control unit is connected with the positive electrode of the third diode.
Further, the first dimming control unit comprises a sixth resistor, a seventh resistor, an eighth resistor, a first triode, a second triode, a fourth resistor and a first MOS tube; one end of the sixth resistor is connected with the base electrode of the first triode; the collector of the first triode is connected with one end of the seventh resistor, the collector of the first triode is also connected with the base of the second triode, and the emitter of the first triode is grounded; the collector of the second triode is connected with one end of the eighth resistor, the collector of the second triode is also connected with one end of the fourth resistor, and the emitter of the second triode is grounded; the other end of the seventh resistor is connected with the other end of the eighth resistor; the other end of the fourth resistor is connected with the grid electrode of the first MOS tube, and the other end of the fourth resistor is also connected with the positive electrode of the second triode; the drain electrode of the first MOS tube is connected with the first LED lamp group, and the source electrode of the first MOS tube is connected with the sampling resistor.
Further, the first dimming control unit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a third triode, a fourth triode, a fifth resistor and a second MOS tube; one end of the ninth resistor is connected with the base electrode of the third triode; the collector of the third triode is connected with one end of the tenth resistor, the collector of the third triode is also connected with the base of the fourth triode, and the emitter of the third triode is grounded; the collector of the fourth triode is connected with one end of the eleventh resistor, the collector of the fourth triode is also connected with one end of the fifth resistor, and the emitter of the fourth triode is grounded; the other end of the tenth resistor is connected with the other end of the eleventh resistor; the other end of the fifth resistor is connected with the grid electrode of the second MOS tube, and the other end of the fifth resistor is also connected with the anode of the fourth triode; the drain electrode of the second MOS tube is connected with the second LED lamp group, and the source electrode of the second MOS tube is connected with the sampling resistor.
Further, the power supply circuit module comprises a first diode, a first capacitor, a first resistor and a second capacitor; the negative electrode of the first diode is connected with the first capacitor, and the negative electrode of the first diode is also connected with one end of the first resistor; the other end of the first capacitor is grounded; the other end of the first resistor is connected with the second capacitor and grounded; one end of the second capacitor is connected with the silicon controlled rectifier protection circuit, and the other end of the second capacitor is grounded.
Further, the other end of the sixth resistor is connected with the first pulse width regulator, and the other end of the ninth resistor is connected with the second pulse width regulator.
Further, the seventh resistor and the eighth resistor are connected with a first voltmeter switch, and the tenth resistor and the eleventh resistor are connected with a second voltmeter switch.
Further, a gate-connected thyristor is connected between the first resistor and the second capacitor, and one end of the gate-connected thyristor is connected with the cathode of the first diode D1, one end of the first capacitor and one end of the first resistor.
Further, the first capacitor and the second capacitor are electrolytic capacitors.
The thyristor and the sampling resistor arranged in the short-circuit protection circuit are adjusted in real time according to the voltage of the LED lamp and correspondingly adjusted in an adaptive manner, and the short-circuit is locked to avoid the control chip from restarting repeatedly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, 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 utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall structure diagram of a short-circuit protection circuit provided in an embodiment of the present utility model;
fig. 2 is a block diagram of a short-circuit protection circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model 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 utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. 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 be further 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.
As shown in fig. 1 and 2, the short-circuit protection circuit provided by the present embodiment is used for short-circuit protection of an LED lamp, and the circuit includes a power supply circuit module, a thyristor protection circuit module and a dimming control circuit module; one end of the power supply circuit module is connected with one end of the silicon controlled rectifier protection circuit module, the other end of the silicon controlled rectifier protection circuit module is connected with one end of the dimming control circuit, and the other end of the dimming control circuit is connected with the LED lamp; the power supply circuit module is used for supplying power to the silicon controlled rectifier protection circuit module; the silicon controlled rectifier protection circuit module is used for providing short-circuit protection for the dimming control circuit module.
Further, the thyristor protection circuit module includes a second diode D2, a third diode D3, a second resistor R2, a third resistor R3, a third capacitor C3, a thyristor Q5, and a sampling resistor RS1; the anode of the second diode D2 is connected with the dimming control circuit module, and the cathode of the second diode D2 is connected with the anode of the thyristor Q5; the anode of the third diode D3 is connected with the dimming control circuit module, and the cathode of the third diode D3 is connected with the anode of the thyristor Q5; one end of the second resistor R2 is connected with the power supply circuit module, and the other end of the second resistor R2 is connected with the anode of the thyristor Q5; the cathode of the thyristor Q5 is grounded, the end pole of the thyristor Q5 is connected with one end of the third capacitor C3, and the end pole of the thyristor Q5 is also connected with one end of the third resistor R3; the other end of the third resistor R3 is connected with one end of the sampling resistor RS1, and the other end of the third resistor R3 is also connected with the dimming control circuit module; the other end of the third capacitor C3 is grounded; the other end of the sampling resistor RS1 is grounded.
Specifically, the third capacitor C3 is configured to store electric energy and supply electric energy to each component in the protection circuit, so that the protection circuit can also keep a state of starting operation at any time in a state of operating the control circuit, so as to ensure timeliness of starting protection operation of the protection circuit, the third resistor R3 is configured to divide voltage, improve power-on security of the protection circuit, two ends of the sampling resistor RS1 are respectively connected with the thyristor Q5 and the third capacitor C3, if the control circuit has a short circuit fault, after the voltage applied to the sampling resistor RS1 reaches a preset voltage threshold, the G pole level of the thyristor Q5 triggers and realizes conduction of the thyristor Q5, so that components in the protection circuit enter a short circuit protection state, the protection circuit performs short circuit protection on the control circuit under continuous electric energy supply, in this state, the circuit control chip does not repeatedly start, and the short circuit protection circuit is not entirely subject to a hiccup phenomenon.
Further, the dimming control circuit module comprises a first dimming control unit and a second dimming control unit, wherein the first dimming control unit is connected with the positive electrode of the second diode D2, and the second dimming control unit is connected with the positive electrode of the third diode D3.
Specifically, the first diode D1 of the power supply circuit can supply power to the protection circuit in a unidirectional manner, so as to prevent the circuit from generating current reversal to cause faults, and the first capacitor C1 and the second capacitor C2 promote the electric energy storage capacity and the power supply stability of the power supply circuit.
Further, the first dimming control unit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first triode Q3, a second triode Q4, a fourth resistor R4, and a first MOS transistor Q1; one end of a sixth resistor R6 is connected with the base electrode of the first triode Q3; the collector of the first triode Q3 is connected with one end of a seventh resistor R7, the collector of the first triode Q3 is also connected with the base of the second triode Q4, and the emitter of the first triode Q3 is grounded; the collector of the second triode Q4 is connected with one end of an eighth resistor R8, the collector of the second triode Q4 is also connected with one end of a fourth resistor R4, and the emitter of the second triode Q4 is grounded; the other end of the seventh resistor R7 is connected with the other end of the eighth resistor R8; the other end of the fourth resistor R4 is connected with the grid electrode of the first MOS tube Q1, and the other end of the fourth resistor R4 is also connected with the anode of the second triode Q4; the drain electrode of the first MOS tube Q1 is connected with the first LED lamp group LEDA, and the source electrode of the first MOS tube Q1 is connected with the sampling resistor RS 1.
Specifically, the frequency converter can be used for current frequency conversion in the power supply circuit, and a user adjusts the frequency converter to enable the current frequency in the power supply circuit to be suitable for the short-circuit protection state of the protection circuit.
Further, the first dimming control unit includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third triode Q6, a fourth triode Q7, a fifth resistor R5, and a second MOS transistor Q2; one end of the ninth resistor R9 is connected with the base electrode of the third triode Q6; the collector of the third triode Q6 is connected with one end of a tenth resistor R10, the collector of the third triode Q6 is also connected with the base of a fourth triode Q7, and the emitter of the third triode Q6 is grounded; the collector of the fourth triode Q7 is connected with one end of an eleventh resistor R11, the collector of the fourth triode Q7 is also connected with one end of a fifth resistor R5, and the emitter of the fourth triode Q7 is grounded; the other end of the tenth resistor R10 is connected with the other end of the eleventh resistor R11; the other end of the fifth resistor R5 is connected with the grid electrode of the second MOS tube Q2, and the other end of the fifth resistor R5 is also connected with the anode of the fourth triode Q7; the drain electrode of the second MOS tube Q2 is connected with the second LED lamp set LEDB, and the source electrode of the second MOS tube Q2 is connected with the sampling resistor RS 1.
In an actual use scene, a user adjusts the brightness or color difference of the LED lamp through a circuit under the control of the control chip, the control circuit of the LED lamp generates short-circuit protection when short-circuit occurs, and the control chip is restarted, so that the short-circuit protection circuit enters a hiccup mode, and the control chip is continuously and repeatedly restarted under the condition that the short-circuit state is not completely released until the short-circuit state is released; the short-circuit protection circuit disclosed by the embodiment is used for providing short-circuit protection without hiccup modes when brightness adjustment is carried out on an LED lamp, the short-circuit protection circuit comprises three parts, namely a silicon controlled rectifier protection circuit module, a power supply circuit module and a dimming control circuit module, the power supply circuit module and the dimming control circuit module are sequentially and functionally connected, the power supply circuit module is used for supplying power for the protection circuit, a silicon controlled thyristor Q5 is arranged in the silicon controlled rectifier protection circuit module, the thyristor Q5 can be subjected to line conduction state adjustment according to voltage change, the electrified line of the thyristor Q5 is arranged on a sampling resistor RS1 and used for inducing real-time voltage change, specifically, the anode of the thyristor Q5 is connected with the power supply circuit module, the power supply circuit module is enabled to supply current to the thyristor Q5 and other components of the silicon controlled rectifier protection circuit module, the end electrode of the thyristor Q5 is connected with the dimming control circuit module and grounded, the anode of a second diode D2 is connected with the dimming control circuit module, the components in the silicon controlled rectifier protection circuit module are connected with the components in the dimming control circuit module, voltage sensing and state adjustment are carried out jointly, and the cathode of the thyristor Q5 is connected with the other end of the sampling resistor RS1 in parallel, and the other end of the sampling resistor RS1 is enabled to be connected with the cathode of the thyristor Q5 in a safe mode; the dimming control circuit module comprises a first MOS tube Q1, a grid electrode GATA of the first MOS tube Q1 is connected with an anode of a second diode D2, a drain electrode of the first MOS tube Q1 is connected with a cathode of a thyristor Q5, a source electrode of the first MOS tube Q1 is connected with an LED lamp, furthermore, when the LED lamp controlled by the source electrode of the first MOS tube Q1 is in short circuit, the voltage received by a sampling resistor RS1 can be obviously increased, a trigger level threshold value of the thyristor G electrode is preset by a user, the voltage received by the sampling resistor RS1 reaches or exceeds the trigger level threshold value of the thyristor G electrode, the thyristor Q5 is triggered to be conducted, the power supply circuit module is in stable power supply for a controllable silicon protection circuit module component comprising the thyristor Q5, at the moment, the controllable silicon protection circuit module is in stable power supply for continuous stable conduction, the controllable silicon protection circuit module is not required to restart a circuit control chip for a plurality of times, and can be understood, the controllable silicon protection circuit module can be connected into a plurality of control circuits according to actual use conditions of a user, and the quantity of LED lamp protection circuits can be controlled by the LED protection circuit modules, and the LED lamp protection circuit module can be controlled by the LED protection circuit module to realize the constant voltage protection circuit protection under the conditions of the LED protection circuit protection conditions of the LED lamp protection circuit module under the conditions shown in the figure 2, and the LED protection circuit protection conditions.
In summary, above-mentioned short-circuit protection circuit provides safe and stable connection protection for control circuit under the circumstances that the short circuit takes place for control circuit in LED lamp control process, the connection structure of power supply circuit and protection circuit is succinct, it is convenient and high-efficient to insert, effectively switch on and carry out short-circuit protection to control circuit when control circuit takes place the short circuit, in short-circuit protection process, the voltage rise that causes because of control circuit short circuit is timely accurate to be sensed to components and parts in the protection circuit and react fast, protection circuit keeps stable after switching on, protection circuit and control circuit switch on can prevent that control circuit from causing the damage because of the short circuit, protection circuit keeps steady state and can prevent that circuit control chip from restarting and cause holistic hiccup mode of circuit, be favorable to strengthening the generation efficiency and the validity of circuit short-circuit protection mechanism.
Further, the power supply circuit module includes a first diode D1, a first capacitor C1, a first resistor R1, and a second resistor R2; the cathode of the first diode D1 is connected with the first capacitor C1, and the cathode of the first diode D1 is also connected with one end of the first resistor R1; the other end of the first capacitor C1 is grounded; the other end of the first resistor R1 is connected with the second resistor R2 and grounded; one end of the second resistor R2 is connected with the silicon controlled rectifier protection circuit, and the other end of the second resistor R2 is grounded. Further, the other end of the sixth resistor R6 is connected to the first pulse width modulator, and the other end of the ninth resistor R9 is connected to the second pulse width modulator.
Further, the seventh resistor R7 and the eighth resistor R8 are connected to the first voltmeter switch, and the tenth resistor R10 and the eleventh resistor R11 are connected to the second voltmeter switch.
Further, a gate-connected thyristor is connected between the first resistor R1 and the second resistor R2, and one end of the gate-connected thyristor is connected with the cathode of the first diode D1, one end of the first capacitor C1 and one end of the first resistor R1.
Further, the first capacitor C1 and the second resistor R2 are electrolytic capacitors.
Specifically, a pulse width regulator is arranged in the power supply circuit and used for regulating the current pulse width, the first triode Q3 is respectively connected with the second triode Q4 and the second diode D2 to complete the construction of a communication protection mechanism among the power supply circuit, the protection circuit and the control circuit, the electrolytic capacitor is a capacitor type divided according to the structure and the manufacturing process, generally, the electrolytic capacitor is a capacitor with polarity, and the anode of the electrolytic capacitor adopts a passivated metal material such as aluminum, tantalum, niobium, titanium and the like; the dielectric material is a compact oxide film generated on the surface of the anode metal material; the cathode material of the electrolytic capacitor is electrolyte, and the electrolytic capacitor is mainly characterized in that under the same volume, the capacitance which is much larger than that of the common capacitor can be obtained.
The utility model discloses a short-circuit protection circuit, which comprises a power supply circuit module, a silicon controlled rectifier protection circuit module and a dimming control circuit module; one end of the power supply circuit module is connected with one end of the silicon controlled rectifier protection circuit module, the other end of the silicon controlled rectifier protection circuit module is connected with one end of the dimming control circuit, and the other end of the dimming control circuit is connected with the LED lamp; the power supply circuit module is used for supplying power to the silicon controlled rectifier protection circuit module; and the silicon controlled rectifier protection circuit module. In the short-circuit protection process, components in the protection circuit timely and accurately sense voltage rising caused by short circuit of the control circuit and quickly react, the protection circuit is kept stable after being conducted, the protection circuit is connected with the control circuit to prevent the control circuit from being damaged due to short circuit, the protection circuit is kept in a stable state to prevent the circuit control chip from being restarted repeatedly to cause the whole hiccup mode of the circuit, and the generation efficiency and the effectiveness of a short-circuit protection mechanism of the circuit are enhanced.
The present utility model 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 utility model, and these modifications and substitutions are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A short-circuit protection circuit for short-circuit protection of an LED lamp, comprising: the device comprises a power supply circuit module, a silicon controlled rectifier protection circuit module and a dimming control circuit module;
one end of the power supply circuit module is connected with one end of the silicon controlled rectifier protection circuit module, the other end of the silicon controlled rectifier protection circuit module is connected with one end of the dimming control circuit, and the other end of the dimming control circuit is connected with the LED lamp;
the power supply circuit module is used for supplying power to the silicon controlled rectifier protection circuit module; the silicon controlled rectifier protection circuit module is used for providing short-circuit protection for the dimming control circuit module.
2. The short-circuit protection circuit of claim 1, wherein the thyristor protection circuit module comprises a second diode, a third diode, a second resistor, a third capacitor, a thyristor, and a sampling resistor;
the anode of the second diode is connected with the dimming control circuit module, and the cathode of the second diode is connected with the anode of the thyristor;
the anode of the third diode is connected with the dimming control circuit module, and the cathode of the third diode is connected with the anode of the thyristor;
one end of the second resistor is connected with the power supply circuit module, and the other end of the second resistor is connected with the anode of the thyristor;
the cathode of the thyristor is grounded, the end electrode of the thyristor is connected with one end of the third capacitor, and the end electrode of the thyristor is also connected with one end of the third resistor;
the other end of the third resistor is connected with one end of the sampling resistor, and the other end of the third resistor is also connected with the dimming control circuit module;
the other end of the third capacitor is grounded;
the other end of the sampling resistor is grounded.
3. The short-circuit protection circuit according to claim 2, wherein the dimming control circuit module comprises a first dimming control unit and a second dimming control unit, the first dimming control unit is connected with the positive electrode of the second diode, and the second dimming control unit is connected with the positive electrode of the third diode.
4. The short-circuit protection circuit according to claim 3, wherein the first dimming control unit comprises a sixth resistor, a seventh resistor, an eighth resistor, a first triode, a second triode, a fourth resistor, and a first MOS transistor;
one end of the sixth resistor is connected with the base electrode of the first triode;
the collector of the first triode is connected with one end of the seventh resistor, the collector of the first triode is also connected with the base of the second triode, and the emitter of the first triode is grounded;
the collector of the second triode is connected with one end of the eighth resistor, the collector of the second triode is also connected with one end of the fourth resistor, and the emitter of the second triode is grounded;
the other end of the seventh resistor is connected with the other end of the eighth resistor;
the other end of the fourth resistor is connected with the grid electrode of the first MOS tube, and the other end of the fourth resistor is also connected with the positive electrode of the second triode;
the drain electrode of the first MOS tube is connected with the first LED lamp group, and the source electrode of the first MOS tube is connected with the sampling resistor.
5. The short-circuit protection circuit according to claim 4, wherein the first dimming control unit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a third triode, a fourth triode, a fifth resistor, and a second MOS transistor;
one end of the ninth resistor is connected with the base electrode of the third triode;
the collector of the third triode is connected with one end of the tenth resistor, the collector of the third triode is also connected with the base of the fourth triode, and the emitter of the third triode is grounded;
the collector of the fourth triode is connected with one end of the eleventh resistor, the collector of the fourth triode is also connected with one end of the fifth resistor, and the emitter of the fourth triode is grounded;
the other end of the tenth resistor is connected with the other end of the eleventh resistor;
the other end of the fifth resistor is connected with the grid electrode of the second MOS tube, and the other end of the fifth resistor is also connected with the anode of the fourth triode;
the drain electrode of the second MOS tube is connected with the second LED lamp group, and the source electrode of the second MOS tube is connected with the sampling resistor.
6. The short-circuit protection circuit of claim 1, wherein the power circuit module comprises a first diode, a first capacitor, a first resistor, and a second capacitor;
the negative electrode of the first diode is connected with the first capacitor, and the negative electrode of the first diode is also connected with one end of the first resistor;
the other end of the first capacitor is grounded;
the other end of the first resistor is connected with the second capacitor and grounded;
one end of the second capacitor is connected with the silicon controlled rectifier protection circuit, and the other end of the second capacitor is grounded.
7. The short-circuit protection circuit according to claim 5, wherein the other end of the sixth resistor is connected to the first pulse width modulator, and the other end of the ninth resistor is connected to the second pulse width modulator.
8. The short circuit protection circuit of claim 5, wherein the seventh resistor and the eighth resistor are connected to a first voltmeter switch, and the tenth resistor and the eleventh resistor are connected to a second voltmeter switch.
9. The short-circuit protection circuit according to claim 6, wherein a gate-connected thyristor is connected between the first resistor and the second capacitor, and one end of the gate-connected thyristor is connected to the negative electrode of the first diode, one end of the first capacitor, and one end of the first resistor.
10. The short circuit protection circuit of claim 6, wherein the first capacitor and the second capacitor are electrolytic capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223306770.8U CN219019082U (en) | 2022-12-08 | 2022-12-08 | Short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223306770.8U CN219019082U (en) | 2022-12-08 | 2022-12-08 | Short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219019082U true CN219019082U (en) | 2023-05-12 |
Family
ID=86269512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223306770.8U Active CN219019082U (en) | 2022-12-08 | 2022-12-08 | Short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219019082U (en) |
-
2022
- 2022-12-08 CN CN202223306770.8U patent/CN219019082U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110829509A (en) | Simple electric field induction energy-taking power supply | |
| CN112421755B (en) | Power supply system for power monitoring based on Internet of things | |
| CN113056058A (en) | Drive circuit for driving LED device and LED circuit | |
| CN111885763B (en) | Low-power pulse xenon lamp control method and control circuit | |
| CN116915169B (en) | Photovoltaic cell bypass circuit | |
| CN107666305B (en) | Intelligent switch | |
| CN211509375U (en) | Drive circuit for driving LED device and LED circuit | |
| CN219019082U (en) | Short-circuit protection circuit | |
| CN114205944B (en) | Control circuit of pulse xenon lamp power supply | |
| CN202503733U (en) | Voltage-dropping constant-current light-emitting diode (LED) driving power supply with high power factors | |
| CN206117538U (en) | Switching power supply circuit device that convergence was inputed in zero standby | |
| CN212752130U (en) | Pull-irrigation bidirectional power supply | |
| CN108258889A (en) | Auxiliary power supply of photovoltaic inverter system | |
| CN210380681U (en) | Alternating current series connection electricity-taking circuit | |
| CN211656000U (en) | Power supply circuit for inhibiting instant starting-up impact current | |
| CN204559398U (en) | Wind power generation adjustable fly-back power circuit | |
| CN208539799U (en) | A kind of AC conversion circuit based on experiment instruments used for education | |
| CN207251464U (en) | Anti- overshoot circuit with the damping of wide output area | |
| CN111628560A (en) | Solar energy power supply | |
| CN111511067A (en) | Control circuit and lamp | |
| CN208112501U (en) | Auxiliary power supply of photovoltaic inverter system | |
| CN219678329U (en) | Switching power supply circuit | |
| CN220874419U (en) | Starting circuit of high-voltage battery system isolated power supply control chip | |
| CN219181405U (en) | Electrical switching power supply device | |
| CN108832807A (en) | A kind of miniaturization low power consumption switch power starting circuit and starting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |