CN110854816B - Buck circuit with overvoltage protection circuit - Google Patents
Buck circuit with overvoltage protection circuit Download PDFInfo
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- CN110854816B CN110854816B CN201911193047.3A CN201911193047A CN110854816B CN 110854816 B CN110854816 B CN 110854816B CN 201911193047 A CN201911193047 A CN 201911193047A CN 110854816 B CN110854816 B CN 110854816B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 75
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 5
- 230000001629 suppression Effects 0.000 claims description 3
- 229910001120 nichrome Inorganic materials 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- -1 iron-chromium-aluminum Chemical compound 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a Buck circuit with an overvoltage protection circuit, which comprises a Buck circuit, a heating device short circuit and a safety device F1, wherein the heating device short circuit comprises a heating component R1, the heating component R1 is attached to the safety device F1, when the Buck circuit outputs overvoltage voltage, the heating device short circuit is conducted, and the heating component R1 generates heat to cut off the safety device F1. When the Buck circuit fails to cause overhigh output voltage, the short-circuit of the heating device can be timely switched on, so that the heating component R1 is promoted to heat, and the safety device F1 is tightly attached to the heating component R1, so that the heat of the heating component R1 can cut off the safety device F1, the voltage input of the Buck circuit is cut off, the overhigh voltage output by the Buck circuit is prevented, rear-end equipment connected with the Buck circuit is prevented from being damaged due to overvoltage, electronic elements of the whole circuit are protected, and the stable and safe operation of the circuit is ensured.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a Buck circuit with an overvoltage protection circuit.
Background
The Buck circuit is a Buck chopper circuit, is one of basic DC-DC circuits, is used for the step-down conversion from direct current to direct current, and with the continuous development of society, the living standard is also improving constantly, and electrical equipment is increasing day by day, and what many electrical equipment internal power supply converting circuits adopted is the Buck circuit, and its range of application is very extensive.
The current power converters adopting the Buck circuits have failure modes that the switch tube is damaged or the voltage feedback circuit fails to output high voltage. Most of the switch tubes adopt MOSFETs, and the failure causes of the MOSFETs are mainly internal low-resistance conduction, which is equivalent to that the output voltage is equal to the input voltage, and the back-end circuit (equipment) is easily damaged. Similarly, failure of the voltage feedback circuit may also result in an output voltage that is too high.
Disclosure of Invention
The invention mainly aims to provide a Buck circuit with an overvoltage protection circuit, and aims to solve the safety problem after the Buck circuit fails.
The invention provides a Buck circuit with an overvoltage protection circuit, which comprises the following schemes: buck circuit, device short circuit and safety device F1 generate heat, the device short circuit that generates heat includes heating element R1, heating element R1 is hugged closely safety device F1 works as when Buck circuit output overvoltage voltage, switches on the device short circuit that generates heat, heating element R1 produces the heat and cuts off safety device F1.
Furthermore, the Buck circuit comprises an inductor L1, a capacitor C1, a MOS transistor Q1 and a MOS transistor Q2, wherein one end of the inductor L1 is connected with a source electrode of the MOS transistor Q1 and a drain electrode of the MOS transistor Q2, the other end of the inductor L1 is connected with one end of the capacitor C1, and a source electrode of the MOS transistor Q2 is connected with the ground and the other end of the capacitor C1.
Further, the short-circuit of the heating device further comprises a MOS tube Q3, a diode Z1 and a diode Z2, wherein the anode and the cathode of the diode Z2 are respectively connected with the output cathode OUT-and the output anode OUT + of the Buck circuit, one end of a heating component R1 is connected with the input anode IN + of the Buck circuit, the other end of the heating component R1 is connected with the drain of the MOS tube Q3, the grid of the MOS tube Q3 is connected with the anode of the diode Z1, the source of the MOS tube Q3 is grounded, and the cathode of the diode Z1 is connected with the cathode of the diode Z2.
Further, the short circuit of the heat generating device further comprises a voltage division adjusting resistor R2 and a voltage division adjusting resistor R3, one end of the voltage division adjusting resistor R2 is connected with the grid of the MOS transistor Q3 and one end of the voltage division adjusting resistor R3, the other end of the voltage division adjusting resistor R3 is connected with the anode of the diode Z1, and the other end of the voltage division adjusting resistor R3 is connected with the source of the MOS transistor Q3.
Further, the diode Z2 is a transient suppression diode.
The driving control circuit is provided with a high-end output driving channel HO and a low-end output driving channel LO, the high-end output driving channel HO is connected with a grid electrode of an MOS tube Q1, the low-end output driving channel LO is connected with a grid electrode of an MOS tube Q2, one end of the driving control circuit is connected with an input anode IN + of the Buck circuit, the other end of the driving control circuit is connected with an output anode OUT + of the Buck circuit, the feedback circuit is used for collecting output voltage of the output anode OUT + of the Buck circuit and feeding the output voltage back to the driving control circuit, when the output voltage is larger than a threshold voltage, the driving control circuit sends OUT a high-level signal, and the heating device short circuit is used for switching on the MOS tube Q3 and the low-end output driving channel LO according to the high-level signal, The diode Z1 and the diode Z2 are used for conducting the heating element R1.
Further, the heating component R1 is a heating resistance wire.
Further, the fuse device F1 is a fuse.
Further, the safety device F1 is a thermal breaker.
Further, the Buck circuit further comprises an under-voltage self-locking circuit, wherein one end of the under-voltage self-locking circuit is connected with the input anode IN + of the Buck circuit, and the other end of the under-voltage self-locking circuit is connected with the input end of the safety device F1.
According to the Buck circuit with the overvoltage protection circuit, when the Buck circuit fails to work and the output voltage is too high, the short circuit of the heating device can be timely connected, so that the heating component R1 is heated, and the safety device F1 is tightly attached to the heating component R1, so that the heat of the heating component R1 can cut off the safety device F1, the voltage input of the Buck circuit is cut off, the Buck circuit is prevented from outputting the too high voltage, the rear-end equipment of the Buck circuit is prevented from being burnt and damaged due to overvoltage, electronic elements of the circuit are protected, and the stable and safe operation of the circuit is guaranteed.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a Buck circuit with an over-voltage protection circuit according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the content clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, units, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and/or groups thereof. 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 also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, a schematic diagram of a Buck circuit with an overvoltage protection circuit according to the present invention is shown, and as shown in fig. 1, the Buck circuit with the overvoltage protection circuit according to the present invention includes a Buck circuit, a heating device short circuit and a safety device F1, the heating device short circuit includes a heating element R1, the heating element R1 is closely attached to the safety device F1, when the Buck circuit outputs an overvoltage voltage, the heating device short circuit is turned on, and the heating element R1 generates heat to cut off the safety device F1.
The Buck circuit with overvoltage crowbar circuit of this embodiment, when Buck circuit step-down became invalid, then Buck circuit output voltage was too high, can switch on heating device short circuit this moment, thereby make heating element R1 generate heat, and because safety device F1 hugs closely heating element R1, consequently heating element R1's heat can cut off safety device F1, realize the voltage input of breaking Buck circuit, thereby the too high voltage of Buck circuit output has been prevented, and then prevent Buck circuit rear end equipment because of the excessive pressure loss of burning, each electronic component of circuit has been protected simultaneously, guarantee the stable safe operation of circuit.
In this embodiment, the Buck circuit includes an inductor L1, a capacitor C1, a MOS transistor Q1, and a MOS transistor Q2, wherein one end of the inductor L1 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q2, the other end is connected to one end of the capacitor C1, and the source of the MOS transistor Q2 is connected to ground and the other end of the capacitor C1. The Buck circuit has the characteristics of mature and stable circuit, high conversion efficiency and the like.
IN this embodiment, the short circuit of the heat generating device further includes a MOS transistor Q3, a diode Z1, and a diode Z2, wherein the anode and the cathode of the diode Z2 are respectively connected to the output cathode OUT-and the output anode OUT + of the Buck circuit, one end of the heat generating component R1 is connected to the input anode IN + of the Buck circuit, the other end is connected to the drain of the MOS transistor Q3, the gate of the MOS transistor Q3 is connected to the anode of the diode Z1, the source of the MOS transistor Q3 is grounded, and the cathode of the diode Z1 is connected to the cathode of the diode Z2.
The Buck circuit is a step-down chopper circuit and is used for converting an input high voltage into a proper low voltage to be output, so that the working requirements of different equipment are met. Under the normal working state of the Buck circuit, high voltage is input through an input positive electrode IN + of the Buck circuit and an input negative electrode IN-of the Buck circuit, and low voltage is output through an output positive electrode OUT + of the Buck circuit and an output negative electrode OUT-of the Buck circuit. When the Buck circuit is abnormal to cause voltage reduction failure, namely the input voltage is high voltage, the output voltage is also high voltage, the circuit is connected with the diode Z2 and the diode Z1, current flows from the input positive electrode IN + of the Buck circuit through the heating component R1, the MOS tube Q3, the diode Z1 and the diode Z2 and returns to the output negative electrode OUT-of the Buck circuit, the heating component R1 is IN a short-circuit state, the heating component R1 generates heat, the safety device F1 is cut off, and the voltage input of the Buck circuit is cut off. In the present embodiment, when the diode Z2 is turned on, if the MOS transistor Q1 is broken and the MOS transistor Q1 is shorted, the fuse F1 is shorted, the current flowing through the fuse F1 increases rapidly, and the fuse F1 is also cut off. In the structure, the diode Z2 is a voltage stabilizing diode, the diode is a semiconductor device with high resistance until the critical reverse breakdown voltage, the reverse resistance is reduced to a small value at the critical breakdown point, the current is increased in the low-resistance area, and the voltage is kept constant, so that the heating component R1 cannot be damaged due to sudden change of the voltage at the contact moment of the short-circuit of the heating device, and the working stability of the short-circuit of the heating device is ensured.
Optionally, the short circuit of the heat generating device further includes a voltage division adjusting resistor R2 and a voltage division adjusting resistor R3, one end of the voltage division adjusting resistor R2 is connected to the gate of the MOS transistor Q3 and one end of the voltage division adjusting resistor R3, the other end of the voltage division adjusting resistor R2 is connected to the anode of the diode Z1, and the other end of the voltage division adjusting resistor R3 is connected to the source of the MOS transistor Q3. The voltage value added to the two ends of the heating component R1 can be adjusted by adjusting the voltage adjusting resistor R2 and the voltage dividing adjusting resistor R3 when the short circuit of the heating device is switched on, so that the heating component R1 heating amount is adjusted, and the risk that the heating component R1 is damaged by high voltage is avoided.
Optionally, diode Z2 is a transient suppression diode. A Transient Voltage Suppressor (TVS) is a diode-type high-performance protection device. When two poles of the TVS diode are impacted by reverse transient high energy, the TVS diode can change the high impedance between the two poles into low impedance at the speed of 10 to the order of minus 12 seconds, absorb surge power of thousands of watts and clamp the voltage between the two poles at a preset value, thereby effectively protecting precise components in an electronic circuit from being damaged by various surge pulses.
Optionally, the Buck circuit with the overvoltage protection circuit of the invention further includes a driving control circuit and a feedback circuit, the driving control circuit has a high-end output driving channel HO and a low-end output driving channel LO, the high-end output driving channel HO is connected with the gate of the MOS transistor Q1, the low-end output driving channel LO is connected with the gate of the MOS transistor Q2, one end of the driving control circuit is connected with the input anode IN + of the Buck circuit, the other end of the driving control circuit is connected with one end of the feedback circuit, the other end of the feedback circuit is connected with the output anode OUT + of the Buck circuit, and the feedback circuit is used for collecting the output voltage of the output anode OUT + of the Buck circuit and feeding back the output voltage to the driving control circuit, when the output voltage is greater than the threshold voltage, the driving control circuit sends out a high level signal, and the heating device short-circuit switches on the MOS transistor Q3, the diode Z1 and the diode Z2 according to the high level signal so as to switch on the heating component R1.
In this embodiment, the output voltage of the Buck circuit is collected in real time through the feedback circuit and fed back to the drive control circuit, the drive control circuit can compare the fed-back voltage with the threshold voltage set by a user, and when the output voltage is greater than the threshold voltage, the drive control circuit sends out a high-level signal, so that the short circuit of the heating device is switched on. The feedback circuit and the drive control circuit can realize the protection of the circuit according to the threshold voltage set by a user, so that the user can properly set the threshold voltage according to the load condition of equipment connected with the output end of the Buck circuit, and the overvoltage protection of the load is accurately realized.
In the above configuration, the driving control circuit further includes a driving node switch SW, and the driving node switch SW is connected to the source of the MOS transistor Q1, the drain of the MOS transistor Q2, and the input terminal of the inductor L1. Which is used to control the closing of the drive control circuit. The drive control circuit also has a power supply VCC for providing a voltage for the inside of the drive control circuit.
Optionally, the heating component R1 is a heating resistance wire. The heating principle is that electric energy is converted into heat energy, and when current passes through a resistor, the current does work to consume the electric energy, so that heat is generated. Wherein, the heating resistor silk can select for use the nichrome heating wire, and the intensity of nichrome heating wire in high temperature environment is high, long-term high temperature operation non-deformable, difficult change structure, and the normal atmospheric temperature plasticity of nichrome heating wire is good, and the restoration after the deformation is comparatively simple. In addition, the nichrome heating wire has high radiance, no magnetism, good corrosion resistance and long service life. Or an iron-chromium-aluminum alloy heating wire is selected, the operating temperature of the iron-chromium-aluminum alloy heating wire is high, and experiments show that the highest operating temperature of the iron-chromium-aluminum alloy heating wire can reach 1400 ℃. The Fe-Cr-Al alloy electric heating wire has long service life, high resistivity, high surface recombination and good oxidation resistance. Of course, the heating resistance wire made of other materials may be selected in the present application, and is not limited herein.
Optionally, the fuse device F1 is a fuse. When the temperature of the fuse itself is too high, the fuse blows, thereby cutting off the circuit. Therefore, when the temperature of the heating element R1 is high enough, the fuse will be blown by the heat, and the circuit can be switched.
Optionally, the safety device F1 is a thermal sensitive circuit breaker, the thermal sensitive circuit breaker is a device that realizes current switching by using the characteristic that the thermal expansion coefficient of each component layer of the bimetal is different, and when the temperature changes, the deformation of the active layer is larger than that of the passive layer, so that the whole bimetal bends towards one side of the passive layer, and the curvature of the composite material changes to generate deformation.
Optionally, the Buck circuit with the overvoltage protection circuit provided by the invention further comprises an undervoltage self-locking circuit, wherein one end of the undervoltage self-locking circuit is connected with the input anode IN + of the Buck circuit, and the other end of the undervoltage self-locking circuit is connected with the input end of the safety device F1. When the input voltage of the Buck circuit is too low, the undervoltage protection circuit cuts off the voltage input and keeps a cut-off state, so that the phenomenon that the circuit works abnormally or the circuit performance is poor due to too low working voltage is avoided, the stability of a power supply system is improved, and the service life of the power supply is prolonged.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A Buck circuit with an overvoltage protection circuit is characterized by comprising a Buck circuit, a heating device short-circuit and a safety device F1, wherein the heating device short-circuit comprises a heating component R1, the heating component R1 is tightly attached to the safety device F1, when the Buck circuit outputs overvoltage voltage, the heating device short-circuit is conducted, and the heating component R1 generates heat to cut off the safety device F1;
the short-circuit of the heating device further comprises a MOS tube Q3, a diode Z1 and a diode Z2, wherein the anode and the cathode of the diode Z2 are respectively connected with the output cathode OUT-and the output anode OUT + of the Buck circuit, one end of the heating component R1 is connected with the input anode IN + of the Buck circuit, the other end of the heating component R1 is connected with the drain electrode of the MOS tube Q3, the grid electrode of the MOS tube Q3 is connected with the anode of the diode Z1, the source electrode of the MOS tube Q3 is grounded, and the cathode of the diode Z1 is connected with the cathode of the diode Z2;
the short circuit of the heating device further comprises a voltage division adjusting resistor R2 and a voltage division adjusting resistor R3, one end of the voltage division adjusting resistor R2 is connected with the grid of the MOS tube Q3 and one end of the voltage division adjusting resistor R3, the other end of the voltage division adjusting resistor R3 is connected with the anode of the diode Z1, and the other end of the voltage division adjusting resistor R3 is connected with the source of the MOS tube Q3.
2. The Buck circuit with the overvoltage protection circuit as claimed in claim 1, wherein the Buck circuit comprises an inductor L1, a capacitor C1, a MOS transistor Q1 and a MOS transistor Q2, one end of the inductor L1 is connected with a source electrode of a MOS transistor Q1 and a drain electrode of a MOS transistor Q2, the other end of the inductor L1 is connected with one end of a capacitor C1, and a source electrode of the MOS transistor Q2 is connected with the ground and the other end of the capacitor C1.
3. The Buck circuit with the overvoltage protection circuit according to claim 1, wherein the diode Z2 is a transient suppression diode.
4. The Buck circuit with the overvoltage protection circuit as claimed IN claim 1, further comprising a driving control circuit and a feedback circuit, wherein the driving control circuit has a high-side output driving channel HO and a low-side output driving channel LO, the high-side output driving channel HO is connected to the gate of a MOS transistor Q1, the low-side output driving channel LO is connected to the gate of a MOS transistor Q2, one end of the driving control circuit is connected to the input anode IN + of the Buck circuit, the other end of the driving control circuit is connected to one end of the feedback circuit, the other end of the feedback circuit is connected to the output anode OUT + of the Buck circuit, the feedback circuit is used for collecting the output voltage of the output anode OUT + of the Buck circuit and feeding back the output voltage to the driving control circuit, when the output voltage is greater than a threshold voltage, the driving control circuit sends OUT a high level signal, the heating device short circuit switches on the MOS transistor Q3, the diode Z1 and the diode Z2 according to the high level signal to turn on the heating element R1.
5. The Buck circuit with the overvoltage protection circuit according to claim 1, wherein the heating component R1 is a heating resistance wire.
6. The Buck circuit with the over-voltage protection circuit according to claim 1, wherein the fuse device F1 is a fuse.
7. The Buck circuit with the overvoltage protection circuit according to claim 1, wherein the fuse device F1 is a thermal cut-out.
8. The Buck circuit with the overvoltage protection circuit according to claim 1, further comprising an under-voltage self-locking circuit, wherein one end of the under-voltage self-locking circuit is connected with an input anode IN + of the Buck circuit, and the other end of the under-voltage self-locking circuit is connected with an input end of the fuse device F1.
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| CN201911193047.3A CN110854816B (en) | 2019-11-28 | 2019-11-28 | Buck circuit with overvoltage protection circuit |
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| CN201911193047.3A CN110854816B (en) | 2019-11-28 | 2019-11-28 | Buck circuit with overvoltage protection circuit |
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| CN110854816B true CN110854816B (en) | 2022-04-15 |
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| CN203423477U (en) * | 2013-08-08 | 2014-02-05 | 深圳市同洲电子股份有限公司 | Overvoltage protection circuit |
| CN104426119A (en) * | 2013-08-26 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Power output protection circuit |
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